Activity
Well Intervention
Accessing or servicing an existing well including workover activities.
Newest 100 Documents
All 123 in search- 202631 Mar
Staged WOMP submission process
NOPSEMA describes its preferred phased submission of well operations management plans, separating lifecycle management processes from construction, production and abandonment detail. The paper explains concept-selection and detailed-design submissions, risk registers, barrier acceptance criteria, change management and regulatory inspections, while allowing titleholders to retain their existing submission structure.
- 2026Feb
Well Workover
This regulatory inspection guide presents compliance questions for oil and gas well-workover operations. It covers prior approval, well-control fluid replenishment and measurement, crown-block safety checks, mud-pit level warnings, tubing and wellhead requirements, wireline leakage prevention, and pressure testing of newly installed lubricators against expected shut-in surface pressure.
- 2026Jan
Well Operations
An inspection guide presenting compliance questions for well operations under Subpart G, with regulatory authorities and enforcement codes. It covers casing and liner integrity, surface and subsea blowout preventer configuration, pressure and function testing, maintenance and records, alongside specific requirements for coiled tubing and snubbing systems.
- 2025Dec
Office PINC List
An office compliance checklist pairs regulatory questions with cited authorities and enforcement codes. It covers operational approvals, structural records, financial security, well-control competence, spill preparedness, drilling and decommissioning. Further checks address pipeline maintenance and reporting, reservoir conservation, production measurement, and geological and geophysical permits and data submissions.
- 202430 May
2024-01 64 Investigation of March 25, 2022, Hydraulic Workover Unit Failure Fatality
BSEE investigates a fatal hydraulic workover unit collapse at Main Pass Block 64 Platform #19. Severely corroded structural casing buckled after crane support was removed, and a worker tied to the unit was pulled into the water. Findings examine load assessment, Anchor Spool stabilisation, oversized equipment and unclear operator–contractor responsibilities.
- 202326 Dec
Wendland 1H Well Fatal Explosion
CSB investigates a fatal blowout and fire during tubing-head replacement at a Texas oil and gas well. It analyses inadequate well-control planning, ineffective hydrostatic and valve barriers, and ignition-source management. Recommendations address workover methods for underpressured reservoirs, well-history review and gaps in industry guidance and federal regulation.
- 2023May
Hydrogen Sulfide
Regulatory inspection questions address areas classified as hydrogen sulphide present or unknown. They cover contingency plans, training, drills, gas detection, respiratory protection, ventilation and medical equipment. Further checks address soluble sulphide testing, well-control fluid treatment, flaring, detector testing intervals and corrosion-resistant materials during well and production operations.
- 202225 Apr
Toppled Hydraulic Workover Unit Results in Fatality
This preliminary alert describes a fatal hydraulic workover unit toppling on a Gulf of Mexico caisson. An elevated, harnessed contractor fell into the water with part of the unit. Initial observations identified a casing break; causes remained under investigation. Recommendations address structural capacity, support arrangements, fall protection design, supervision and task planning.
- 20224 Apr
Improper Fan and Other Equipment Used in Hazardous (Classified) Locations During Coiled Tubing Operations
BSEE inspectors found an unsuitable fan and extension cord beside a gas buster during coiled tubing operations. Changing the plug had not changed the fan’s rating. The alert recommends considering classification drawings, equipment approval markings, applicable standards and checks for damage or improper electrical modifications.
- 202124 Feb
Failure to Follow Procedures Results in Pollution Incidents
BSEE describes two Gulf of Mexico pollution incidents involving open valves during well workover and synthetic-based mud transfer. The second investigation remained ongoing, with preliminary findings indicating procedural non-compliance. Recommendations address flow-path understanding, valve labelling, physical verification before start-up, defined responsibilities and lockout/tagout barriers for overboard mud-system components.
- 20201 Dec
2020-002 GC 205-A Investigation of June 1, 2019, Fatality Lease OCS-G05911 Green Canyon Area Block 205-A
Investigates a fatal fall through a well hatch on the Genesis platform during slickline work. Workers mistakenly lifted the A-13 cover while intending to replace A-14’s cover. The report examines cover identification, securing, handling and task planning, and recommends improved procedures, practical training and designs distinguishing installed from stored covers.
- 2015Jul
2015-002 ST 220 Investigation of Loss of Well Control and Fire, Gulf of Mexico, July 23, 2013, South Timbalier Area Block 220, Well No. A-3 OCS-G 24980
BSEE investigates the South Timbalier A-3 blowout and subsequent fire during well completion on Hercules 265. It examines temperature-dependent brine density, seepage losses, kick recognition, shut-in procedures and unsuccessful BOP sealing. The report documents evacuation, depletion-relief drilling, regulatory findings and recommendations; the ignition source remains unknown.
- 201524 Feb
Safety Alert 315 - Dynamic Positioning System Failures on Offshore Supply Vessels Engaged in Oil and Gas Operations
Joint Coast Guard and BSEE alert examines an offshore supply vessel losing position during wireline plug removal, shearing a wellhead tree through connected high-pressure lines and releasing lubricant. It discusses ignored DP failures, emergency disconnect capability, DP equipment classes, activity-specific guidance, personnel competence and leaseholder oversight of contracted vessels.
- 201430 Sep
Line-of-Fire Incident Results in Medical Treatment Case
An operator in an aerial lift was struck in the face when a binding lubricator assembly sprang free from a BOP stack during separation on a hybrid well service rig. The alert describes the positioning and movements preceding the impact, subsequent medical assessment and surgery for facial fractures.
- 201421 May
Pressure Release After Ice Plug Removal Results in Injury
A snubbing operator removed ice from a production casing valve using a steel chisel after methanol proved unsuccessful. Although the valve was assumed closed, removal released high-pressure wellbore gas and fluid. The crew evacuated, retrieved the supervisor from the wellhead area and controlled the well by fully closing the valve.
- 20141 May
Safety Alert 310 - Hydraulic Workover Unit Toppled by Waterspout
A waterspout toppled a hydraulic workover unit on an offshore platform after personnel had moved to a supporting lift boat. BSEE identified high wind loading and increased guy-line angles as contributing factors. Recommendations address engineering calculations, additional support lines, seasonal weather and wire-rope selection against API specifications.
- 201419 Jan
Safety Alert 306 - Trapped Pressure Beneath a Tubing Plug Blows Work String from Well
During offshore well recompletion, cutting tubing below a plug released trapped pressure and expelled 807 feet of work string. No injuries were reported. BSEE identified debris and sand obstructing plug flow and equalisation, and recommended pre-entry diagnostics, procedures addressing trapped pressure, and consideration of snubbing units where pressure remained uncertain.
- 201217 Feb
Report - Montara investigation: Volume three
Third volume of an expert witness investigation into the Montara hydrocarbon release. It reconstructs the operational timeline, charts H1-ST1 integrity during construction, suspension and re-entry, and evaluates barrier acceptance and verification. Technical responses examine corrosion caps, annular seals, cement isolation, change management and opportunities for risk assessment.
- 201217 Feb
Report - Montara investigation: Volume two
The second volume of an expert witness investigation examines nine issues surrounding the Montara hydrocarbon release. It assesses cement volumes, slurry properties, over-displacement, casing-shoe testing and corrosion-cap handling. Documentary analysis considers well suspension, barrier adequacy and programme changes, with proposed improvements to verification, contingency procedures and risk assessment.
- 2012
OSHA Fatal Facts, Oil Patch No. 2-2012
A rig hand was fatally struck by a load block after a wire-rope hoisting line failed during gas-well casing removal. The alert describes broken strands, guard contact and poor rope condition, and recommends regular inspections, appropriate lubrication, slipping and cut-off maintenance, ton-mile service-life calculations and worker training.
- 201120 Sep
Failure of BOP Ram Yolk Results in a Natural Gas Release from BOP
A rigless snubbing operation experienced a natural gas release during ram-to-ram staging of production tubing. A broken stripping-ram yoke prevented adequate closing pressure and sealing. The operator closed the upper rams; damaged rams were subsequently removed for analysis. The BOP remained within its required certification period.
- 201120 Jul
High Potential Near Miss – Hoisting Line Disconnected from Drawworks Drum
A well-service rig experienced a hoisting-line disconnection from its drawworks, without injury or equipment damage. The alert identifies the potential for a travelling block to drop following loss of the line clamp. The blocks were elevated in the mast, with more than twenty line wraps on the drum.
- 2011Mar
OCE25 - Well servicing – chemical injection
This offshore COSHH sheet addresses chemical injection during well servicing and coiled tubing operations. It describes chemical exposure and nitrogen hazards, with guidance on planning, protective equipment, line testing, exposure monitoring and dermatitis surveillance. It also covers spill handling, waste disposal, decontamination, training and supervision.
- 2010Mar
A guide to the Offshore Installations (Safety Case) Regulations 2005
Explains the 2005 offshore safety-case regulations, including duty-holder responsibilities, submission, acceptance and continuing review. Covers major-accident risk evaluation, contractor management, independent verification of safety-critical elements, well-operation notifications and dismantling revisions. Distinguishes notifications from accepted safety cases and explains that acceptance does not guarantee installation safety.
- 2009Sep
A guide to the well aspects of the Offshore Installations and Wells (Design and Construction etc) Regulations 1996. Guidance on Regulations
Explains the well provisions of DCR 1996, covering life-cycle integrity, subsurface assessment, material suitability, well-control equipment and examination schemes. It addresses operator responsibilities, reporting and competence, including suspension and abandonment, and clarifies interfaces with offshore safety cases and installation verification across offshore and land-based operations.
- 20088 Dec
Safety Alert 274 - Wireline BOP and Lubricator Ejection into GOM
A wireline BOP and lubricator were ejected into the Gulf of Mexico during DX plug retrieval, severely injuring the operator’s face. The alert identifies omitted lubricator testing, inadequate pressure equalisation and an unsuitable pulling tool for a modified plug, alongside failures in job safety analysis, stop-work practice and management of change.
- 200812 Nov
Safety Alert 272 - Corroded Ring Gasket Causes Loss of Well Control
An MMS alert describes natural gas escaping through a corroded ring gasket during well scale-removal work. An inoperable subsurface safety valve prevented containment, and the platform was evacuated without injury. Acid treatment possibly accelerated gasket failure. Recommendations address acid-operation policies, emergency plans and gasket history or condition.
- 2008Nov
2008-054 Investigation of Loss of Well Control, South Pelto Block 10, Well No. 10, OCS-G02925, 14 February 2008, Gulf of Mexico off the Louisiana Coast..
Investigates natural-gas release during wireline scale removal and acid treatment at South Pelto Well No. 10. The panel identified ring-gasket corrosion, likely acceleration by acid treatment and an inoperable subsurface safety valve prolonging the event. It examines wellhead testing, integrity inspections and platform evacuation, recommending reviews of acid-operation policies and emergency plans.
- 2008Oct
2008-049 Investigation of Blowout Eugene Island, Block 28 Well No. 4, OCS-G 05479, December 03, 2007, Gulf of Mexico, Off the Louisiana Coast.
Investigation of a workover blowout at Eugene Island Block 28, offshore Louisiana. Production tubing parted during pulling, allowing well pressure to eject tubing before preventers contained the annulus. Metallurgical examination identified fatigue cracking and flow-cut wall thinning. The report reviews barrier tests, work procedures and subsequent snubbing operations to kill the well.
- 200730 Jul
Safety Alert 252 - Retrieving Storm Packers
A storm-packer retrieval released gas and workover fluid, dislodging rotary bushings, injuring one person and splashing two others. An undetected gas bubble was identified, but its exact cause remained undetermined. MMS recommends retrieval procedures, a safety valve, kill-weight fluid, annular-preventer closure and restricting rig-floor personnel.
- 20061 Nov
Slips Knocked Over Resulting in LTI Foot Injury
This alert describes a lost-time foot injury during removal of production tubing in single joints after well testing. A cable from the spider/single-joint elevators caught the slip handles, overturning the slips onto the worker’s upper right foot behind the boot’s steel toe cap, causing a fracture.
- 200518 Feb
Safety Alert 18 - Well-Control Equipment Circumvention
An MMS alert describes loss of well control during workover/completion after completion-fluid pumping stopped and a tubing hanger lockdown pin was removed, bypassing blowout prevention. Seawater and hydrocarbons escaped. It distinguishes direct from possible contributing causes and recommends improved hanger-landing procedures, well-control training and job safety analyses.
- 200429 Nov
Safety Alert 223 - Loss of Well Control
A workover involving nitrogen washing removed a sand bridge from a well shut in for approximately ten years. Gas escaped through a corroded wellhead injection port where a seal assembly was absent, causing a minor condensate spill. The alert recommends reviewing maintenance and improving written instructions and job safety analysis.
- 200424 Jun
Safety Alert 221 - Hanger Failure and Ejection Lead to Well Control Incident
During a workover, hanger hold-down pins sheared at 6,150 psi, ejecting the hanger and tubing. Investigation identified inadequate pin engagement caused by a design flaw. The alert identifies affected Cameron products, recommends multiple well barriers and advises operators to consider shear rams for wells presenting unusual control problems.
- 200219 Dec
Safety Alert 208 - Loss of Well Control
An MMS alert describes a kick during gravel-pack wash-over and a release through a mud-pump pressure safety valve during bull-heading. Investigators identified possible shear-pin deformation following repeated near-set-pressure exposures. Recommendations address visual inspection after such exposures, maintenance to manufacturers’ recommendations and routing valve discharges to a safe location.
- 200229 May
Safety Alert 200 - Subsea Equipment Failure Leads to Deepwater GOM Pollution
An incorrectly seated replacement choke was expelled during restart of a deepwater subsea oil well, releasing crude oil and gas. The alert examines unsuccessful ROV visual verification, delayed shut-in and confusing monitoring displays. Recommendations address pre-job emergency discussions, visually verifiable intervention equipment and clearer control-room systems with reduced need for safety-system bypasses.
- 20028 May
Dropped Object From Snubbing Unit
An alert describes a serious near miss during snubbing-unit rig-up. A Kelly hose dragged against an escape-pod entry panel as the top drive was raised, dislodging the door. It fell some 60 feet, was slowed and deflected by hoses, and glanced off an employee’s hardhat and shoulder.
- 20028 Jan
Inattention Allows Traveling Block to Strike Crown
During tubing retrieval on a truck-mounted rig, the travelling block struck the derrick crown, severing the drill line and dropping the block and elevator equipment onto the rig floor. Impact caused tubing to part and fall into the well. Contract employees evacuated before contact, and the well was immediately secured.
- 200116 Oct
Man Downed by H2S Gas
A well-service rig worker was overcome by hydrogen sulphide during a pump-down stripping job. As the well came in, he attempted to fit a stabbing valve to stop the flow. Operations were immediately suspended, and the worker was taken to hospital.
- 20003 Apr
Safety Alert 187 - Coiled Tubing Incidents
Two Gulf of Mexico coiled-tubing operations suffered tubing separation after encountering unknown obstructions. Failed well-control interventions and absent back-pressure valves led to uncontrolled flow and platform evacuation. The alert recommends hazard analysis, force limits, backflow protection, supervision, communication, equipment-specific procedures, training and weekly well-control drills.
- 2000
Calendar Year 2000
This MMS report compiles incidents reported from Outer Continental Shelf operations during 2000, covering Gulf of Mexico and Pacific regions. Statistical comparisons accompany category-organised narratives of fires, injuries, well-control losses, collisions and pollution. Case findings examine lifting failures, hot work, equipment condition and work planning, while distinguishing events from incident categories.
- 19991 Nov
Failure of a ½” BSP cap under pressure on well service work
A half-inch BSP cap apparently blew off a pressure-testing manifold on an offshore installation at approximately 1200psi water pressure. The missing cap left incomplete engagement and over-tightening as assumptions. Lessons emphasise fitting ratings, tightening procedures and limitations, and checking condition and thread cleanliness before use.
- 1999
OCS Report 1999
Statistical compilation of 1999 Outer Continental Shelf incidents in the Gulf of Mexico and Pacific regions, using TIMS records. It compares operational trends and presents case accounts of blowouts, fires, injuries, crane failures, collisions and pollution, including equipment behaviour, investigation findings and emergency responses. Appendices provide historical comparisons.
- 19986 May
Improper Use of Hand Tools
This alert describes a workover crew running specialised shouldered production pipe under a specified torque requirement. An altered 48-inch pipe wrench served as backup to power tongs, with a snubbing line incorporating a hydraulic device for torque readings. The supplied excerpt does not describe an injury or outcome.
- 1998
OCS Report 1998
This report compiles 1998 Outer Continental Shelf oil and gas incidents by region and event type, combining case narratives with graphical analysis. Pacific and Gulf of Mexico data cover well-control events, fires, collisions, fatalities, injuries and pollution. Cases examine equipment failures, work procedures and response measures, retaining uncertainty in reported causes.
- 199617 Jun
Safety Alert 167 - Retrieval of Back-Pressure Valve Results in Loss of Well Control
A workover incident involving back-pressure valve retrieval released wellbore pressure, expelled fluids and blew rotary bushing inserts onto the drill floor, resulting in one fatality and two injuries. Inspection identified debris in the relief groove and a freely moving poppet. Recommendations address killing the well, equipment functionality, insert retention and checking for trapped pressure.
- 1994
CY 1991-1994 Addendum
This addendum records a fatal workover incident at well B-2 in South Marsh Island. Retrieving a back-pressure valve released trapped pressure and expelled well fluids and objects, killing one worker and injuring two. It identifies probable gas migration beneath the valve and describes pipe rams shutting in the well.
- 198919 Jul
Safety Alert 157 - Wireline Accident Involving the Formation of an Ice Plug in the Lubricator
An ice plug immobilised wireline tools in a lubricator. Bleeding pressure above the plug created a differential that propelled the plug and tools upwards, rupturing the lubricator. A subsurface safety valve shut in the well. The alert suggests retaining test pressure before opening the crown valve and using glycol in test fluid.
- 198719 Jun
Safety Alert 152 - Circulating with Natural Gas Through Coil Tubing
This notice warns against circulating natural gas through coil tubing to bring an oil well into production. Minerals Management Service considers natural gas lifting incompatible with Section 250.46, citing the potential for high-pressure gas release into the workplace following tubing or equipment failure.
- 198518 Jun
Safety Alert 140 - Uncontrolled Well Flow and Pollution During Workover Operations
During reperforating, leaking casing hanger anchor screws were removed without securing the well, leading to uncontrolled flow and approximately 50 barrels of pollution. The platform was evacuated. The alert reiterates requirements for qualified, certified repair personnel, separation from downhole operations and management approval of procedures for repairs to unsecured wells.
- 198513 Feb
Safety Alert 132 - Supply Gas Fire
An offshore platform flash fire occurred when cutting slag ignited supply gas leaking from a surface safety valve actuator O-ring during workover preparations. No injury or damage resulted. The alert records the operator’s planned closer leak checks, actuator depressurisation and firewater deluge activation to intercept sparks before the well bay.
- 198130 Mar
Safety Alert 100 - Explosion, Fire
An offshore safety alert describes an explosion and fire during well killing before snubbing. Returns were routed through a choke manifold into an open mud tank; escaping gas exploded, damaging the platform and injuring four men. The operator planned gas separation, safe vent routing and ignition-source inspections.
- 197910 Sep
Safety Alert 88 - Fire, Men Burned
An offshore drilling tender flash fire burned two men after well gas flowed through a kill line and escaped from an open pump bleed-off valve. A cigarette ignited the gas. The operator’s planned measures include smoking prohibitions, gas detectors, manifold modifications and a check valve for pumping into live wells.
- 197821 Aug
Safety Alert 72 - Explosion, Fire
An offshore supply vessel suffered a gas explosion and fire during acidising of a platform gas well, killing two men and injuring two. The alert describes inadequately vented tanks within the vessel’s superstructure and apparent electrical ignition. The operator’s planned measures include closed, properly vented tanks and boom burning in low winds.
- 197812 Jun
Safety Alert 70 - Blowout During Workover
A workover well apparently swabbed in while a perforation wash tool was being withdrawn. A safety valve failed to close; sand in its working parts could have contributed. The alert recommends mud monitoring during pipe tripping, reserving safety valves for well control and checking valve operation before withdrawal.
- 197715 Apr
Safety Alert 62 - Snubbing Operations Fire, Man Burned
An offshore workover snubbing fire caused third-degree burns to a wireline supervisor after well gas entered an open circulating tank through a fully opened choke. Ignition was probably from nearby power units or exhaust stacks. The operator planned separator bleed-down, choke closure when unused, and clearing rather than bypassing plugged chokes.
- 197623 Jun
Safety Alert 45 - Tubing Blows Out of Well, Men Injured
An offshore workover incident expelled 600 feet of tubing when it was disconnected, leaving five workers with minor injuries while fleeing or being struck by debris. The alert describes the tubing plug and closed subsurface safety valve arrangement, and the operator’s planned well killing and valve blocking measures to prevent trapped gas.
- 197620 Apr
Safety Alert 40 - Beam Falls, Man Injured
A wireline helper was injured by a falling steel beam on an offshore production platform. The beam had been moved for wellhead access and was inadvertently pulled off its support during weight-indicator removal. The operator is replacing the timber decking and beams with steel decking incorporating removable wellhead covers.
- 197518 Aug
Safety Alert 28 - Weld Fails, Derrick Collapses
An offshore workover rig derrick collapsed during pipe fishing after skid welds failed. Falling equipment caused minor injuries to one crewman, and an overturned diesel tank caused minor pollution. The alert records weld radiography and modifications to the skid joint, drawworks position and connections intended to prevent recurrence.
- 197521 Jul
Safety Alert 27 - Gas in Generator Room Explodes
During offshore workover operations, gas from well returns discharged into a mud pit accumulated in the generator motor room and exploded. An available degasser was not used. One worker sustained minor injuries. The operator’s stated actions were instruction on gas handling through degassing equipment and discussion at scheduled safety meetings.
- 19759 Jul
Safety Alert 26 - Crown Block on Workover Rig Fails, Fatality
An offshore workover rig suffered crown-block support weld failure while jarring stuck drill pipe. Falling equipment struck two men, killing one and seriously injuring the other. The operator recommends radiographic examination of all crucial derrick welds after manufacture and before the first job.
- 19756 May
Safety Alert 23 - Sump Tank Fire, Man Burned
Gas escaping from an open sump tank ignited during flowline and header bleed-off following well swabbing on an offshore production platform. A wireline helper suffered burns; ignition cause was unknown. The operator planned lid seals and locks, bleed-off hose connections and vent lines routed to safe locations.
- Undated
Subsea Tree Dropped During Retrieval Damages Jumper
Investigation of a subsea tree dropped during retrieval from Marubeni’s A002 well, damaging the A004 jumper. Findings examine incomplete retrieval-tool testing, omitted over-pull verification, obstructing ROV debris, an ambiguous locking indicator and misunderstood safe-zone instructions. The report records subsequent recovery and repairs, with no district recommendations at that time.
- Undated
Mixed-Fluid Release from a Subsea Well
BSEE investigates a mixed-fluid release from Shell’s PN003 subsea well at Mississippi Canyon 943. ROV diagnostics identified the leak, and valve closure and pressure testing restored two barriers. Tubing and control-line separation was suspected, pending recovery and analysis. The report records revised release estimates and planned tubing replacement.
- Undated
Well-Control Event and Hydrocarbon Spill During Coiled Tubing Work
BSEE investigates a well-control and pollution event at West Delta 80 D during coiled tubing work. The report examines tubing-to-casing communication, probable corrosion-related alignment pin plug failure, delayed remediation and reporting, and inadequate fluid-handling capacity. An estimated 107 gallons of hydrocarbons spilled; all 19 personnel evacuated without injury.
- Undated
Sling Failure Dropped Lubricator and Tool String During E-Line Zone Change
Investigation of a nylon sling failure during an e-line zone change on well A-2. A choker arrangement below the lubricator’s lifting bracket allowed a sharp edge to chafe the sling. The lubricator and tool string struck the deck and fell into the Gulf of Mexico, without injuries or pollution.
- Undated
Falling Retrieval Tool Struck Worker’s Leg During Slickline Operations
BSEE investigates a slickline injury at Baldpate Platform involving a released retrieval tool that fell, toppled and struck a worker’s left leg. Findings identify an unenforced red zone, insufficient lubricator extension and wire interference with the retrieval latch. The report records medical treatment and an incident of noncompliance.
- Undated
Uncontrolled Man-Rider Descent During Drillship Hose Maintenance
BSEE investigates an uncontrolled man-rider descent during hose maintenance on the Noble Globetrotter 1 drillship. Altered control settings bypassed safety functions, while corrosion, inadequate maintenance and inspection deficiencies were identified. The worker underwent precautionary medical evacuation and was cleared for full duty. BSEE distinguished administrative deficiencies from equipment-failure factors.
- Undated
Fire and Hydrocarbon Release During Well Clean-Up
Investigates a fire and minor pollution incident at Eugene Island 261 A platform during well clean-up. Liquid carry-over through the vent system, compressor blowdown and wind brought hydrocarbons onto hot exhaust surfaces. Findings address separator operation and an incorrectly repaired leak; recommendations concern automatic drainage, blowdown restriction and scrubber design.
- Undated
Supervisor Lost Footing During Workover Operations
BSEE investigates a head injury during workover operations on the Magnolia platform. A supervisor lost his footing while stepping down from a wireline ram preventor onto a deck flange after disconnecting lifting gear. Findings address inadequate hazard analysis, missing crane signalling arrangements and overnight medical monitoring before evacuation.
- Undated
Platform Fire During Well Unloading
Investigation of a fire on Eugene Island 261 A platform during well unloading. Completion-fluid carry-over, a recurring header leak and compressor blowdown overloaded the vent system. Wind carried discharged hydrocarbons onto hot exhaust surfaces. Recommendations address scrubber design, automatic liquid drainage and restriction of compressor blowdown surges.
- Undated
Gas Release Ejects Rotary Bushings During Storm Packer Retrieval
An investigation of gas released beneath a storm packer during workover retrieval describes fluid ejecting rotary bushings and causing minor foot bruising and swelling. It examines barrier testing, annular preventer closure and the possible contribution of missing detailed unseating procedures and an absent specialist tool man.
- Undated
Shoulder Injury While Jumping Between Coiled-Tubing Structures During Well Workover
BSEE investigates a shoulder injury during well workover on the Helix Q-4000 at Garden Banks Block 506. A worker attempted to jump between coiled-tubing structures, lost his footing and injured his shoulder while grabbing the cabin frame. Findings identify failure to use the ladder required by the working-at-height job safety analysis.
- Undated
Sling Broke During Dry Hole Tree Removal
BSEE investigates an arm injury during dry hole tree removal at MP 41-CA. Raising the liftboat while its crane remained connected caused a sling to catch on a tubing hanger pin and break. The report identifies inadequate hazard analysis and unwatched load movement, and records evacuation and lost time exceeding three days.
- Undated
Well Gas Release During Wireline Retrieval
BSEE investigates a small well-gas release during wireline retrieval at Ewing Banks Block 305. Broken wire escaped through the stuffing box, and gas ruptured the grease seal oil reservoir. Findings identify inadequate vent capacity and lubricator check-valve failure. Blow-out preventers and the crown valve secured the well; no injuries or environmental damage occurred.
- Undated
Oil Release from Shut-In Subsea Well
BSEE investigates an oil release from Shell’s shut-in subsea VA007 well at Mississippi Canyon 940. ROV diagnostics and valve closures stopped the leak; subsequent e-line work identified parted production tubing at a coupling. The spill was estimated at seven barrels over several days. The reason for tubing failure remained unknown.
- Undated
Well Kick During Plugging Back for a Sidetrack
Investigation of a well-control event during plugging back for a sidetrack at Green Canyon Block 236. Packer leakage and embrittled elements were reported, with inadequate mud weight contributing. The kick was estimated at over 100 barrels; drilling mud arrived after roughly 30 hours and killed the well uneventfully.
- Undated
Moving Wireline Unit Pinned Helper Against Toolbox
An investigation describes a wireline unit moving across a deck and pinning a helper against a toolbox, causing a right-leg laceration and medical evacuation. The report attributes the incident to omitted securing chains during rigging up and identifies failure to follow wireline procedures as a contributing cause.
- Undated
Gas Entered Platform Fresh-Water Supply During Well Washing
Investigation of gas entering a platform’s fresh-water supply during well washing, prompting suspension of production and crew muster. The report identifies a connected high-pressure water pump and leaking regulator, describes isolation and check-valve testing and replacement, and records provision of an independent water source for the pump.
- Undated
Descending Blocks Struck Derrick Worker’s Hand During Tubing Removal
Investigation of a hand injury during tubing removal from well B-6. Descending blocks struck a derrick worker’s hand and pipe as he tried to control a stand. The worker was lowered from the derrick and transported by air for treatment. The report identifies lack of training and excessive speed as probable causes.
- Undated
Platform Fire During Wireline Solvent Treatment and Chemical Flowback
Investigation of a platform fire during wireline solvent treatment and chemical flowback into an open-top tank. A consultant suffered burns and personnel evacuated. Findings examine uncontrolled well flow, inadequate grounding, unavailable safety valves and deficient work planning; a forensic assessment attributed ignition to static discharge near the gas buster or tank.
- Undated
Gas and Oil Leakage from Well Released Oil into Gulf
Investigation of gas and oil leakage from Vermilion 279 well A3/A3D, with an estimated 0.67 gallons of oil entering Gulf of Mexico waters. The report traces earlier leak diagnostics and isolation attempts, attributing plug failure to reservoir shut-in pressure and describing deteriorated tubing and successive casing leaks.
- Undated
Tubing Hanger Fell onto Pipe Skate During Workover Tubing Removal
Investigation of two employee injuries during workover tubing removal. A tubing hanger handling tool separated while an air tugger tailed the assembly out, allowing the hanger to fall approximately 15 feet onto a pipe skate. Whether tool failure or improper installation caused the separation remained unknown; contact with one injured employee was also uncertain.
- Undated
Oil Discharge Through Platform Produced-Water System
BSEE investigates an estimated three-barrel oil discharge through Thunder Horse’s produced-water system on 13 July 2020. The report links water-quality problems to inadequate flushing of subsea well workover fluids, discusses possible emulsion and foaming, examines delayed pollution notifications, and records corrective communication training and recommendations for agency coordination.
- Undated
Wireline Helper Sustained Finger Injuries During Wireline Operations
BSEE investigates two finger-injury episodes involving a wireline helper aboard Macy Lyn. After an earlier wrench injury, he entered a restricted area and adjusted wire with the unit running, fracturing his finger. Findings address omitted task hazards, missing wireline training, excessive working hours, reporting failures and inadequate supervision.
- Undated
Hose Rupture Injured Workers During Coiled Tubing Reel Nitrogen Blowdown
An investigation examines three first-aid injuries during nitrogen blowdown of a coiled tubing reel at Garden Banks Block 215. A high-pressure hose ruptured, striking two workers; another injured his knee avoiding it. Findings identify corrosion and oxidation, absent hose restraints, and missing inspection and preventive maintenance arrangements.
- Undated
Snubbing Rig Collapse During Offshore Well Servicing
Investigation of a snubbing rig collapse during well servicing on an offshore platform. Waterspout winds and an incorrect guy-line angle were identified as likely causes. The report examines support geometry, wire-rope strength and deck constraints, and recommends proper angles and additional lines where space is limited. No injuries or pollution were reported.
- Undated
Crane Boom Damaged During Stuck Pump Rod Pulling
An investigation examines crane boom damage during attempts to pull stuck pump rods and flush a well. Rod separation caused boom rebound and a swinging headache ball struck the boom tip. Findings identify improper crane use, missing procedures and unresolved load-indicator maintenance issues; recommendations restrict rod pulling and require maintenance and operating procedures.
- Undated
Workstring Ejection During Tubing Cutting
Investigation of a workstring ejection during tubing cutting at VR 398 Well A002. Sand and wireline debris obstructed the DX plug’s equalising ports, while a leaking overshot packoff gave a false indication of pressure equalisation. Blowout preventer closure controlled the well; the report records equipment damage and recommends a safety alert.
- Undated
Gas Bubble Dislodges Gas Buster During Coiled Tubing Operations
Investigation of damage during coiled tubing operations at South Timbalier Platform B. Hydrate removal used a glycol–water mixture. A gas bubble passed through the return line and choke, dislodging the gas buster. The report identifies slow choke-operator response and failure to stop work as causes; no injuries or pollution occurred.
- Undated
Pressure Burst Expels BOP and Lubricator During Wireline Plug Removal
Investigation of a wireline incident at VR-267-I platform during removal of a modified DX plug. Unequalised pressure and an unsuitable pulling tool preceded a pressure burst that expelled the BOP and lubricator. The operator suffered facial injuries while falling to escape. Findings address pressure testing, approved procedures, job safety analysis and stop-work practices.
- Undated
Wireline Operator Injured Foot While Crossing Barricaded Wire
Investigation of a wireline operator’s foot injury while servicing the A-1 well. Attempting to cross a barricaded wire, he struck it with his right foot and landed awkwardly, sustaining two fractures. Findings identify entry into the restricted area, incomplete job safety analyses and missing barricade content in the training manual.
- Undated
Condensate and Gas Release Beneath Hurricane-Toppled Platform
Investigation of a condensate and gas release from Well C-9 beneath a platform toppled by Hurricane Ike. The report examines a broken master valve, uncertain subsurface barrier failures and a proposed trapped hydraulic-pressure mechanism. It describes limited condensate recovery, valve replacement and cement squeezing to secure the well.
- Undated
Worker Struck by Hammer During Wellhead-Cap Bolt Removal
An investigation into a thumb injury during wellhead-cap bolt removal using hammer-wrenches. A hammer glanced off the upper wrench and struck the worker holding the lower wrench. The report identifies poor hand placement and a missed swing, records surgery and approximately four weeks of light duty, and describes newly purchased locking back-up wrenches.
- Undated
Casing Leak Released Oil and Gas into Sea
BSEE investigates a casing leak at South Pass 28 13(V) that released oil and gas into Gulf of Mexico waters. The report traces unsuccessful well-killing attempts, bridge-plug isolation and welded repair. It identifies inadequate preventive maintenance, corrosion and erosion as probable causes, alongside rough seas and shallow water as contributing conditions.
- Undated
Broken Pipe Stop Arm Struck Worker During Well Abandonment
Investigation of a pipe stop arm failure during well abandonment on the SS 241 platform. A broken section fell 24 feet and struck a worker’s right arm. Metallurgical analysis identified incomplete weld penetration and lack of fusion; design documentation omitted complete joint penetration requirements. The worker returned to full duty the following day.
- Undated
Loss of Well Control During Recompletion Required Tubing Shearing
Investigation of a well-control incident during recompletion at HI A 443. Inadequate well-control fluid weight and an unavailable hoist prevented timely valve insertion, requiring tubing shearing to shut in the well. Three workers were injured and an estimated 9.34 gallons of oil entered Gulf waters. Training and fluid-weight maintenance are discussed.
- Undated
Hydrocarbon Release During Casing Cutting for Subsea Well Abandonment
Investigation of hydrocarbon leakage during abandonment of a temporarily abandoned subsea well in the Gulf of Mexico. Cutting casing strings released trapped annular gas and liquid hydrocarbons. The report describes spill response, a pollution dome, remedial cement plugging and subsequent clearance, and identifies primary casing cement as the only annular barriers.
- Undated
Vessel Lost Station Keeping and Severed Production Tree During Wireline Operations
Investigation of Endurance’s loss of station keeping during wireline operations at Eugene Island 355A. Vessel movement severed the production tree through connected rigid pipework, causing an oil spill and deck damage without reported injuries. Suspected communications-tower interference and absent emergency disconnection are examined, alongside equipment-separation measures and proposed vessel evaluation procedures.
- Undated
Flash Fire During Coiled Tubing Operations
Investigation of a flash fire during coiled tubing operations beside a producing platform. Gas venting through an open gas-buster clean-out valve migrated to a diesel pump engine and ignited following a backfire, burning the operator. Findings address missing fluid returns, inadequate hazard analysis, delayed simultaneous-operations planning and obstructed emergency egress.