Well Integrity-Sealant Pressure Barrier for High Delta P, V0 Sealing and Long Durability
- Youngbin Shan (EverGreen Energy Service, LLC.) | Wenxiang Gao (CNPC Tarim Oilfield) | Xuelong Wang (BHDC Korla branch) | Minglei Xu (BHDC Institute of Engineering and Technology) | Cong Cao (BHDC Korla branch) | Chao Zhang (CNPC Tarim Oilfield) | Hai Du (CNPC Tarim Oilfield) | Xiaohu Jin (EverGreen Energy Service, LLC.) | Xiaodan Su (CCDC Changqing DownHole Technology Company) | Wenxiong Wang (New Technology Development Center, Shaanxi)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil & Gas Conference and Exhibition, 17-19 November, Virtual
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 2.1.3 Completion Equipment, 4.1.2 Separation and Treating, 4.1 Processing Systems and Design, 2.10 Well Integrity, 2.9 Recompletion, 4 Facilities Design, Construction and Operation, 2 Well completion
- SPOT, GAS WELL, HIGH PRESSURE, SEALANT, SQUEEZING
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- 9 since 2007
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It is a great challenge for well integrity when a high volume gas production well is found with the production casing broken near the wellhead hanger resulting in high pressure communication between Annulus A and B.
The objective of the paper is to propose a new solution to establish a strong pressure barrier between annulus via a sealant system and to show that such a barrier has been proven to be durable for long time.
A proprietary resin sealant is the key technology and precise job planning and execution are also viewed as being vital to the success of treatments.
Because tubing flow pressure may reach up to 10,000 psi during production after recompletion, operator decided to pressure test the sealant barrier to 10,000 psi for a minimum of 30 minutes duration. If pressure drop during the pressure test is less than 100psi, then the well is allowed to be recompleted.
Several spots and squeezes of sealant eventually setup a strong pressure barrier and were pressure tested up to 10,000 psi in both A and B Annuli. There was no pressure communication at the other annulus in the 30 minute test period.
In the past six (6) years, the operator has tried several jobs to repair casing leaks but none were successful. It was the first time that a sealant system provided a solution to repair a casing leak and hold a high pressure differential.
During recompletion, the production packer failed to set but the operator decided to initiate production. A annulus pressure increased quickly and finally stabilized at 8700 psi. It is now a year since the job was completed in October, 2019, and B annulus pressure in has consistently remained at zero pressure. This has proved that the sealant technology can securely setup and provide a high pressure barrier which is valid for long term V0 sealing.
|File Size||1 MB||Number of Pages||12|
Alok Kumar Singh(Cairn India Ltd) | Bhushan Patil(Cairn India Ltd) | Kunal Kishore(Cairn India Ltd) | Manu Khanna(Cairn India Ltd) | Sai Rakesh Varma(Cairn India Ltd) | Chris Anderson(Seal-Tite International): "Casing Leak Investigation & Successful Repair by Application of Pressure Activated Liquid Sealant in a Newly Completed Well in Offshore Environment – A Case Study," paper SPE-173826-MS presented at Bergen One Day Seminar, 22 April, Bergen, Norway.
Maurice B. Dusseault, SPE, Porous Media Research Institute, University of Waterloo, Waterloo, Ontario; Malcolm N. Gray, Atomic Energy of Canada Limited, Mississauga, Ontario; and Pawel A. Nawrocki, CANMET, Sudbury, Ontario: "Why Oilwells Leak: Cement Behavior and Long-Term Consequences" paper SPE 64733 presented at the SPE International Oil and Gas Conference and Exhibition in China held in Beijing, China, 7–10 November 2000.