川南下寒武统筇竹寺组页岩气井防漏堵漏技术

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

严焱诚 唐涛 张生军 王治国 何苗 何新星

YANYancheng TANGTao ZHANGShengjun WANGZhiguo HEMiao HEXinxing

中国石化西南油气分公司石油工程技术研究院, 四川 德阳 618000 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500

Petroleum Engineering Technology Research Institute, Southwest Petroleum Branch, SINOPEC, Deyang, Sichuan 618000, China State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

川南寒武系筇竹寺组页岩气资源量2 206$\times$10$^8$ m$^3$，是四川盆地天然气增储上产的重要领域。区块地质结构复杂，上部地层存在溶洞、大裂缝，中部地层发育溶蚀缝洞，下部地层发育断缝、褶缝及溶蚀缝，导致川南页岩气井地表至目的层均有不同类型不同漏速的井漏发生，且漏失量大、处理时间长。针对上述难题，开展了井漏特征分析，以避、防、堵相结合的地质工程一体化的防漏堵漏为指导思路，精细分析各地层漏失特征，通过技术思路调整、关键材料研选、室内体系优化实验及现场应用迭代升级，形成了基于缝洞预测的地质工程一体化轨道设计与随钻提高地层承压能力防漏技术、非失返性井漏广谱桥浆堵漏技术、失返性井漏复合堵漏技术与储层温控固结堵漏技术，构建了筇竹寺组页岩气井分层分类防治一体化防漏堵漏技术体系。应用结果表明，井漏治理时长降低65%，为筇竹寺组页岩气高效开发提供了技术支持。

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.

10.11885/j.issn.1674 5086.2024.12.19.01