Leakage Prevention and Plugging Technology of Shale Gas Well of Lower Cambrian Qiongzhusi Formation, Southern Sichuan

doi:10.11885/j.issn.1674-5086.2024.12.19.01

Abstract

Abstract: The Cambrian Qiongzhusi Formation shale gas resources in southern Sichuan are 2 206$\times$10$^8$ m$^3$, which is an important area for increasing natural gas reserves and production in the Sichuan Basin. The geological structure of the block is complex, with karst caves and large fractures developing in the upper strata, dissolution fractures and caves developing in the middle marine strata, and faults, folds and dissolution fractures developing in the lower strata, resulting in different types of leaks from the surface of shale gas wells in southern Sichuan to the target layer. Well leakage occurs rapidly, with large leakage volume and long processing time. In response to the above problems, an analysis of well leakage characteristics was carried out. With the geological engineering integrated leakage prevention and plugging that combines avoidance, prevention and plugging as the guiding idea, the leakage characteristics of each formation were carefully analyzed. Through technical idea adjustment, key material research and selection, indoor system optimization experiments and field application iterative upgrades, we have formed a geological engineering integrated track design based on seam and hole prediction and leakage prevention technology by improving formation pressure bearing capacity while drilling, non-return lost circulation broad-spectrum bridge slurry plugging technology, loss-returning lost circulation composite plugging technology and reservoir temperature control solidification. Using knotted leakage plugging technology, an integrated leakage prevention and plugging technology system for hierarchical classification prevention and control of shale gas wells in the Qiongzhusi Formation has been constructed. The application results show that the lost circulation control time is reduced by 65%, providing technical support for the efficient development of shale gas in the Qiongzhusi Formation.

Key words: southern Sichuan, Qiongzhusi Formation, shale gas, well leakage, lost circulation prevention and plugging technology

CLC Number:

TE254

YAN Yancheng, TANG Tao, ZHANG Shengjun, WANG Zhiguo, HE Miao, HE Xinxing. Leakage Prevention and Plugging Technology of Shale Gas Well of Lower Cambrian Qiongzhusi Formation, Southern Sichuan[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(6): 177-186.

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