Application of short tie-back inserting and setting integrative cementing to Shuangyu X well

WANG Dekun; DENG Ai; ZHOU Qian; LIU Yunlou

doi:10.3969/j.issn.2095-1132.2023.06.003

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Natural Gas Technology and Economy ›› 2023, Vol. 17 ›› Issue (6) : 16-20. DOI: 10.3969/j.issn.2095-1132.2023.06.003

DEVELOPMENT ENGINEERING

Application of short tie-back inserting and setting integrative cementing to Shuangyu X well

WANG Dekun¹, DENG Ai¹, ZHOU Qian², LIU Yunlou¹

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Abstract

In order to sufficiently study the feasibility of short tie-back inserting and setting integrative cementing in the tie-back cementing of complex and deep wells, Shuangyu X well in Sichuan-Chongqing area was taken as an objective to analyze its suitable cementing tools and ensure cementing safety and quality. Results show that (i) this well is one extra deep well deployed in Shuangyushi structure, northwestern Sichuan Basin, which the liner of Φ168.3 mm in five-spudding hangs at the well depth of 5,688.01 m. It has to accept twice tie-back cementing in an effort to ensure cementing quality. To assure the sealing integrity of the cement sheath outside the first short tie-back string, the inserting and setting integrative cementing is adopted, which means to insert the string directly into the flared cylinder and set it after cement injection into the tie-back casing, but not using the conventional swirl nipple at the string bottom any longer, and hence there is no flow hole of swirl nipple after cementing, and the sealing integrity of casing string and the cement sheath can be guaranteed; (ii) technologically, the effective milling of flared cylinder and the structural optimization of tie-back cylinder and short tie-back release unit ensure the effective inserting and sealing of the lower tie-back cylinder while avoiding risks such as the mid-way setting of the release unit of upper short tie-back and the "flatpole inserting" caused by difficult release; (iii) after the application of CemMater cementing software to the design of slurry column structure and construction parameters, the tie-back cementing quality can be guaranteed. In conclusion, in Sichuan-Chongqing area, the short tie-back inserting and setting integrative cementing tool and technology are available for those wells where one-trip long tie-back cementing to wellhead is out of control, and they can ensure cementing quality while solving gas channeling at bell mouth after liner cementing.

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Northwestern Sichuan Basin / Shuangyushi structure / Shuangyu X well / Short tie-back / Inserting and setting integration / Technical practice

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WANG Dekun , DENG Ai , ZHOU Qian , LIU Yunlou. Application of short tie-back inserting and setting integrative cementing to Shuangyu X well. Natural Gas Technology and Economy. 2023, 17(6): 16-20 https://doi.org/10.3969/j.issn.2095-1132.2023.06.003

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Received	Published
2022-10-11	2023-12-28
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2024-01-04

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