Schlumberger designs P&A systems that deliver the most effective, trip-saving technology in the industry. We focus on creating reliable technology that will enable our customers to complete P&A processes in a single trip, increase certainty, and reduce NPT.
Our systems cover the milling and underreaming, casing cutting and pulling, and wellhead retrieval processes. From achieving rock-to-rock zonal isolation to latching onto the wellhead for recovery, our P&A systems support time and money savings across the board.
SINGLE TRIP TO CUT AND RETRIEVE CASING
The ProCISE* casing cutting and recovery system performs multiple casing cuts and engages casing for removal—all in one operation.
Another member of the highly efficient Schlumberger plug and abandonment family, the ProCISE system alleviates costs accumulated from multiple casing cutting and recovery runs. In one operation, the system severs casing, provides efficient circulation, and engages casing for removal.
The multicycle pipe cutter has three sets of blades that can perform multiple casing cuts during a single run, avoiding extra rig time in applications where multiple casing cuts may be required.
Once the cut is successfully confirmed, the ProCISE system engages the in-line casing spear and latches onto the end of the casing segment to be removed. This procedure enables hanging the recovered casing in the rotary table, leaving the casing to be handled more safely and efficiently as it is removed from the wellbore.
In addition, the system has a hydraulic pack-off, making it possible to circulate the annulus free from any settled solids or barite sag. Other system components include a Hydra-Stroke* bumper sub, a conventional bumper sub, and a mud motor.
SINGLE TRIP TO MILL AND UNDERREAM
Combining a bridge plug assembly, an underreamer, and a section mill in a single-trip solution, the ProMILL* trip-saving milling and underreaming system achieves rock-to-rock zonal isolation and prepares the foundation for an abandonment cement barrier.
The industry-unique ProMILL system enables consistent savings during P&A operations by delivering in a single run what takes conventional methods four trips to accomplish.
The ProMILL system combines a bridge plug assembly, a section mill, and a high-ratio underreamer to prepare the foundation for an abandonment cement barrier in a single run. During the run, it eradicates all leak paths from the abandonment barrier while achieving rock-to-rock zonal isolation.
All ProMILL system cutter arms are dressed with high-performance ridged milling elements that, along with the multiblade design, provide high ROP and maximum footage. This unique milling element, designed with a concave pattern and narrow leading edge, has improved durability, stabilization, and results in superior hole cleaning and swarf quality.
The high-ratio underreamer features ball-drop activation, which ensures that the reamer remains inert during the entire milling operation. The section is underreamed and the operator achieves the target access, completing the operation.
SINGLE TRIP TO RECOVER THE WELLHEAD AND SURFACE CASING
The ProLATCH* wellhead retrieval system enables cutting and latching onto the surface casing and removal of the surface casing and wellhead, all in a single trip.
The ProLATCH wellhead retrieval system simplifies mechanical abandonment operations. When a subsea well has been successfully isolated and the wellhead and guide base must be removed for site restoration, the ProLATCH system recovers the surface casing and the wellhead in a single trip.
The system is ideal for offshore operations because it eliminates the need for weight transfer to a marine swivel, compression-cut BHA. This minimizes the risk of fatigue failure by reducing rotating, bending, and bowing in the workstring.
When the wellhead spear is engaged, it is possible to apply an overpull to assist with tension cutting operations. By having an engagement point immediately above the cutter assembly, the system prevents undesirable BHA movements which could result in a failure to achieve the cut. After the casing strings are severed with a high-performance hydraulic pipe cutter, the wellhead spear remains engaged to recover the surface casing and the wellhead.
Case Studies
ProCISE system
CHALLENGE
Reduce rig time needed to cut, pull, and circulate around 9?-in casing known to have annular solids and gas on a deepwater operation in a GOM brownfield.
SOLUTION
Run ProCISE system comprising multiple components integrally designed to perform the P&A operation in a single run.
RESULTS
Retrieved wellhead seals on BHA without needing an extra trip, cut casing free and circulated out trapped gas and packed annular solids in a single trip with established well control, and maximized casing recovery to ensure whipstock setting depth complied with the new sidetrack drilling program.
ProMILL system
CHALLENGE
Set bridge plug, mill and underream 150-ft window in 9?-in casing to enable rock-to-rock barrier placement in a single-trip P&A operation.
SOLUTION
Use ProMILL system with high-performance milling inserts to eliminate up to 3 dedicated trips to surface.
RESULTS
Set 9 5/8-in bridge plug from a taper mill, displaced and conditioned the well, milled at an ROP of 4.5 ft/h and underreamed a 150-ft section, and completed window in a single run. Completed window in a single 50-h run, saving 3.5 rig days and USD 600,000.
ProLATCH system
CHALLENGE
Recover wellhead and casing string in deepwater P&A operation.
SOLUTION
Use ProLATCH system to retrieve the wellhead and surface casing together to simplify the abandonment operation.
RESULTS
Severed the casing strings below the mudline, recovered the wellhead, and saved 12.5 h and USD 600,000.
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