Yajuvendra Kumar Chandrakar

Kuwait Petroleum Corporation (Kuwait)

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Rustem Sunagatov

Kuwait Petroleum Corporation (Kuwait)

Kareem Badrawy

Kuwait Petroleum Corporation (Kuwait)

Mohannad Adel Sebaih

Kuwait Petroleum Corporation (Kuwait)

Abdullah Al-Sarraf

Kuwait Petroleum Corporation (Kuwait)

Abdullah F. Alajmi

Kuwait University

Pravind Gupta

Kuwait Petroleum Corporation (Kuwait)

Mohamed Hedi Slama

Kuwait Petroleum Corporation (Kuwait)

Sergio Rondon Fajardo

Kuwait Petroleum Corporation (Kuwait)

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Kuwait Petroleum Corporation (Kuwait)

Schlumberger (British Virgin Islands)

University of Baghdad

Kuwait University

University of Technology and Applied Sciences - Al Mussanah

Cardiff University

University of Washington

College of Technological Studies

Public Authority for Applied Education and Training

Pennsylvania State University

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Advancing Well Integrity Preservation in Workover Rig Intervention Via Instrumented Coiled Tubing and Through-Tubing Inflatable and Retrievable Packer Deployment: A South Kuwait Case Study

Yajuvendra Kumar Chandrakar Abdullah Al-Sarraf Mohamed Hedi Slama Abdullah F. Alajmi Pravind Gupta

Abstract The purpose of this paper is to present a case study of a pioneering step taken in restoring well integrity for workover rig intervention through the utilization of instrumented coiled tubing (CT) and through-tubing inflatable and retrievable packer (TTIRP) in South Kuwait Field. In this particular instance, mechanical constraints at the christmas tree tubing hanger hindered the ability of the operator to install the blowout preventer (BOP) of the workover rig through conventional means. As a result, a custom-fit approach was implemented to enable the required number of pressure barriers to intervene the well. The intervention approach employed the use of instrumented CT for barrier restoration, well killing and temporary well suspension. CT real-time downhole telemetry was utilized to ensure accurate placement and setting of the TTIRP within the production tubing. Once the packer integrity was pressure tested in both directions, CT was disconnected, and a sand plug followed by an acid soluble cement plug were placed on top of the TTIRP. Upon confirmation of cement plug integrity, the workover rig was utilized to install the BOP for intervention. The instrumented CT was then rigged up and run back-in-hole to clear the cement plug, circulate the sand out, and retrieve the TTIRP to the surface. The candidate well where this innovative intervention workflow was implemented had a maximum potential wellhead pressure of nearly 1,500 psi and a plug-back true depth (PBTD) of 4,000 ft. The well was completed with 3 ½-in. production tubing set close to 3,500 ft MD and 8 5/8-in. casing until PBTD. An e-line through-tubing puncher was carried out in the production tubing before the first CT run to enable circulation of killing fluid. The TTIRP setting depth was conditioned via instrumented CT and high-pressure rotary jetting tool, resulting in a shut-in wellhead pressure near zero psi. The results of this innovative intervention workflow were substantial, with an estimated saving of 195,000- bbl in deferred production (as the well was shut-in for at least 10 months). The lessons learned from this case study can now serve as a reference for operators in the Middle East with wells that present similar challenges.

Inflatable

Workover

Coiled tubing

10.4043/34800-ms

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Citations (2)

Elevating Workover Rig Intervention for Well Integrity Using Instrumented Coiled Tubing and Through-Tubing Inflatable and Retrievable Packer: A South Kuwait Field Application

Yajuvendra Kumar Chandrakar Abdullah Al-Sarraf Mohamed Hedi Slama Abdullah F. Alajmi Pravind Gupta

Abstract This paper delineates a groundbreaking intervention in South Kuwait Field, where the integrity of a well for workover rig operations was successfully reinstated by harnessing instrumented coiled tubing (CT) combined with a through-tubing inflatable and retrievable packer (TTIRP). In the described scenario, mechanical obstructions at the Christmas tree tubing hanger posed significant challenges for the conventional installation of the blowout preventer (BOP) on the workover rig. This necessitated the adoption of a tailored approach to establish the essential pressure barriers for well intervention. The implemented intervention strategy utilized instrumented CT for the dual purposes of well killing and temporary suspension. The real-time downhole telemetry of the CT played a crucial role in guaranteeing the precise deployment and activation of the TTIRP within the production tubing. Following a comprehensive pressure test of the packer from both ends, the CT was removed. Subsequently, a sand plug and an acid-soluble cement plug were strategically positioned above the TTIRP. After verifying the integrity of the cement plug, the workover rig was engaged to fit the BOP. The instrumented CT was then redeployed into the well to dissolve the cement plug, remove the sand, and extricate the TTIRP back to the surface. The targeted well for this advanced intervention workflow was characterized by a maximum potential wellhead pressure of about 1,500 psi and a plug-back true depth (PBTD) of 4,000 ft. The well's completion involved 3 1/2-in. production tubing installed up to approximately 3,500 ft measured depth (MD) and 8 5/8-in. casing extending to the PBTD. Prior to the initial CT operation, an e-line through-tubing puncher was utilized in the production tubing to facilitate the circulation of the killing fluid. The TTIRP's setting depth was meticulously prepared using the instrumented CT and a high-pressure rotary jetting tool, achieving a shut-in wellhead pressure close to zero psi. The outcomes of this cutting-edge intervention workflow were remarkable, conserving an estimated 195,000 barrels of deferred production as the well had been shut-in for a minimum duration of ten months. The insights and experiences accrued from this case study are poised to act as valuable guidelines for operators in the Middle East faced with comparable well challenges.

Inflatable

Workover

Coiled tubing

Structural integrity

10.4043/35302-ms

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