IADC/14-01 Internal Explosion Ruptures Crown Mounted Compensator Piping
Two employees were in the derrick equalizing the internal pressure between Composite Air Pressure Vessels (CAPV) on the Crown Mounted Compensator (CMC) when an ignition occurred inside the system.Either heat generated by adiabatic compression or static generated by the air transfer led to ignition inside the CAPV. Thereafter, the associated raise in pressure and temperature resulted in the interconnecting piping rupturing. Two employees received non-life threatening injuries and were subsequently transported to a shore-based medical facility for further treatment.
IADC/14-02 Drop Object Results in Lost Time Incident
A drilling jar mandrel clamp weighing 26 Kg (57 lbs) dropped from a height of approximately 30 feet (9.14meters) above the rotary table. On the way down, and at about 15 feet (4.5 meters) above the rig floor, it struck and bounced off off a derrick beam. As it continued falling, the mandrel struck a floorhand on his hard hat and left shoulder thus causing a laceration.
IADC/14-03 Struck by Incident Results in Leg Injury
The rig crew was getting the rig ready for cementing. A large piece of PVC pipe, which is normally used to bypass the shakers, could not be found. Two crew members were instructed to use a section of old casing as a substitute for the PVC pipe. One crew member used a forklift to lift the section out of the junk box, while the second crew member stood by as a flagger. The forklift operator then proceeded to stab through the inside circumference of the casing. As the forklift operator lifted the casing, it caught the lip of the junk box, was knocked off of the fork, and fell to the ground. As the section of casing fell, it struck the flagger in the leg resulting in a large abrasion.
IADC/14-04 Blocks Fall to Rig Floor After Drill Line Came Off of the Drawworks
While rigging down the bridle assembly, the Driller was slacking off on the blocks in an attempt to lower the blocks and the bridle equalizer to the rig floor. In the process, the drilling line “dog knot” was pulled from the drum. This allowed the blocks to free-fall approximately 20feet (6 meters), striking the rig floor. During the free-fall, the “dog knot” was hung up in the braces and the fast line sheave, keeping the blocks from falling completely onto the floor. Fortunately there were no injuries.
IADC/14-05 Air Winch Line Caught in Derrick Fingers Results in an Employee Being Pulled Off the Rig Floor
While rigging up a fill and circulation (FAC) tool, the air winch line became trapped in the fingers on the derrick. This prevented the tool from aligning with the wellbore for installation. The tool was lowered in to the V-door to take the weight off and thus free the cable.As an employee pulled the cable free from the derrick fingers it jerked violently pulling the employee off of the rig floor. The employee was thrown approximately 10 feet (3 meters) off of the rig floor and fell striking his head on the edge of the V-door. The employee then fell another 20 feet (6 meters) to the ground.
IADC/14-06 Tank Cable Strike Results in Injury to Employee
Two employees were assigned to lay down the standing 400bbl tanks. The task involves attaching a winch line to the tank bridle and pulling the tank onto the bed of a truck. The bed truck, with the tank attached, was then moved to the desired location and the tank was positioned and unloaded (laid down) to face the lease entrance so a truck tractor can then pick up the tank and haul it to a location to be cleaned. In this incident, the driver of the truck placed his truck in reverse so as to position it in front of the tank while the swamper attached the truck winch to the tank bridle. The tank bridle was visually inspected prior to being attached and did not appear to be faulty. As the truck driver began to winch the tank onto the truck, the bottom of the tank slipped (kicked) out, the tank bridle broke, and the winch line snapped back towards the rear of the truck cab. The winch line tail chain punched through the rear window of the truck, striking the driver on the right side of his head and face. The driver was taken to hospital for examination and x-rays and was released the same day.
IADC/14-07 Arm Caught in Pinch Point on Hydraulic Catwalk Results in Deep Contusion
While rolling a joint of 13 3/8 inch (33cm) casing onto the hydraulic catwalk, an employee was moving away from the equipment on the snow-covered ground when his left forearm was caught between the casing and the indexer arm of the catwalk. He received a deep contusion; however, the injury could have been much more severe as it could have resulted in multiple fractures to his arm.
IADC/14-08 Maintenance on Accommodation’s Elevator Results in a Fatality
During the maintenance of the activation system of the load lift door, a team comprising of an electrician (injured person) and an electronic technician decided to visually check the accommodation’s elevator, in order to compare both mechanisms to facilitate the repair of the load lift. When checking the accommodations elevator, the electrician entered the elevator, climbed on the top of the cabin, changed the operation mode from “Auto” to “Inspection” (maintenance mode), and performed the required inspections. The electrician was unable to determine what was affecting the activation mechanism of the load lift. Concluding the inspection, he took the lift down to just above the lower floor. He then changed the operation mode to “Auto” and leaned over the structure of the door activation mechanism, which placed his head between the lift structure and the door sill of the higher level. Since the lift was positioned above the so called “door zone,” it started its lifting process to level the elevator, which compressed the electrician’s head resulting in the fatality.
IADC/14-09 High Potential Incident - Struck by Dropped Object
As part of the plough recovery sequence and whilst spooling a 200meter (656 feet) pennant onto the storage pocket of an anchor handling winch, a chain guide, weighing 21kilograms (46 pounds), and two sheared securing bolts dropped a distance of approximately 2 meters (6.5 feet) from the starboard chain motor area. The chain guide struck a member of the deck crew on the brim of his hard hat knocking it off. The chain guard then fell onto his chest causing superficial injuries and ultimately landed, with the sheared bolts,on the vessel deck. Using the Drops Calculator as a benchmark in the classification of the potential consequences of a dropped object, the outcome of this incident could have resulted in a fatality.
IADC/14-10 Dropped Landing String Results in Near Miss
At the time of the event, the rig crew was running upper completion on 7 5/8” VAM®Top FE (Fatigue Enhanced) landing string. The hanger was 87 feet (27 meters) from land off. Having made up the final full joint of landing string, the string was lifted approximately five feet to enable a centralizer to be fitted 8feet (2.4 meters) back on the previous joint and manual slips were pulled. When the string was lifted approximately five feet, the latch on the 250 ton side-door elevators failed and the string dropped, with the upper tool joint passing through the rotary. At the time of failure the elevators were positioned +/- 45 feet (14 meters) above the rotary. There were no injuries to personnel. The blocks were then lowered to the deck for a closer inspection.
IADC/14-11 Lack of Communication Results in Fatality
A Mechanic suffered a fatal injury while repairing the iron roughneck (integral to the Pipe Handling Machine – [PHM]) on the rig floor.
The operation at the time was breaking out and laying down the BOP test assembly when a hydraulic hose burst on the iron roughneck. A decision was made to continue laying out the pipe using manual tongs with the PHM upper and lower racking arms.
The Mechanic was notified and he came to the Drill Floor via the unrestricted (“green”) access stairway. The Mechanic identified the burst hose and told the Driller he would check if there was a spare. The Driller told the Mechanic that the crew would continue to lay down tubulars and would be using the PHM.
The Mechanic left the Drill Floor and returned via the restricted access port-side stairway and walked to the rear of the PHM. Signage on the port stairway and on the access gate behind the PHM requires that the Driller be notified prior to entering the rig floor or the area behind the iron roughneck. No one saw the Mechanic arrive on the rig floor and he did not announce his arrival.
The iron roughneck was in “single” mode and in this position the iron roughneck inner carriage is extended out of the carriage’s frame resulting in a 16 inch (41cm) gap between the iron roughneck and the rear access cover. The Mechanic climbed over the rear bumper bars on the PHM and entered into the 16 inch (41cm) gap between the iron roughneck inner carriage and the rear access cover.
The Assistant Driller functioned the PHM to “normal” mode (which causes the iron roughneck inner carriage to retract back into the assembly frame) and then functioned the PHM to rotate to the aft set-back area to pick up a stand of pipe.
The Assistant Driller looked in the direction of the PHM/iron roughneck and noticed red coveralls at the back of the iron roughneck and immediately stopped the PHM. At the same time the drill crew shouted that someone was trapped inside the iron roughneck. The Driller came out of his cabin and realized the Mechanic had been trapped in the iron roughneck.His injuries were fatal.
IADC/14-12 Equipment Shift During Rig Up Results in Near Miss
While attempting to install center steel (spreader beam) during rig up on a box-on-box substructure, the top of the boxes moved away from each other as a crane attempted to adjust a sub half for pin placement. The BOP scaffold, which had been put in place prior to pinning the center steel, was pulled off its track and fell approximately 12feet (3.7 meters). Two employees were standing at one end of the scaffold. They were wearing their fall protection harness and lanyard and were tied off above their heads to the substructure. The equipment worked as intended; no injuries occurred.
IADC/14-13 Pressure Release After Ice Plug Removal Results in Injury
A snubbing crew rigged up on location. Set-up operations were completed for the wellhead stabilizer, snubbing jack, catwalk, pipe racks, pumping unit and primary accumulator. The crew was in the process of installing the snubbing unit equalizer line and the pumping unit flow line. The snubbing unit operator was installing the equalizer crossover into the production casing valve. The casing valve handle was in, what was assumed to be, a fully closed position. The downstream piping assembly was then depressurized and removed.
Upon removal of the downstream piping, the snubbing operator noticed an ice build-up inside the casing valve. The snubbing operator sprayed methanol to attempt removal of the blockage, but was not successful. The snubbing operator then used a steel chisel to break up the blockage. At this time, the snubbing supervisor entered the well head area near the affected production casing valve. When the ice plug within the casing valve was removed, a high pressure flow of wellbore gas and fluid was released.
The snubbing operator and crew evacuated the area and gathered at the safety meeting point. A head count revealed that the snubbing supervisor was not present and was still lying in the wellhead area near a crane. The crew retrieved the snubbing supervisor and controlled the well by fully closing the production casing valve.
IADC/14-14 Improper Pre-Trip Inspection Leads to Runaway Trailer
A tractor trailer was making a left hand turn onto an access road. The trailer became uncoupled from the tractor resulting in an uncontrolled decent down a hill. The trailer was then involved in a collision with a security shack located at the bottom of the hill.
IADC/14-15 Failure to Recognize Hazards Results in Two Downed Powerlines in the Same Day
1stIncident: During rig down operations, a forklift operator told a swamper to move a pole truck across the location and out of the way. The swamper decided to move the truck off of location, but failed to check the height of the poles on the truck. After crossing the cattle guard, the extended pole on the truck made contact with an overhead ground wire causing it to break and fall to the ground.
2ndIncident: After a lengthy safety stand down, a loaded truck was leaving the location and was rounding a right hand curve on the lease road. The truck driver pulled over on the right hand shoulder to avoid a truck parked on the left side. At that time the load leaned to the right on the steep shoulder and made contact with a different power pole. This caused the power pole to break and fall across the lease road. This incident occurred 75 yards past the first incident and approximately 2.5 hours later.