川东北裂缝性碳酸盐岩气层钻井完井保护技术  

Protection technology of drilling and well completion of fractured carbonate gas reservoir in northeastern Sichuan Basin

作　　者：雷鸣[1,2] 瞿佳[1] 康毅力[2] 刘大伟[2,3] 刘艳艳 

机构地区：[1]中国石化勘探南方分公司,四川成都610000 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [3]中国石油渤海钻探工程技术研究院,天津300457

出　　处：《断块油气田》2011年第6期783-786,共4页Fault-Block Oil & Gas Field

基　　金：国家重点基础研究发展规划(973)项目"深井复杂地层漏失与井壁失稳机理及预测"(2010CB226705);国家科技重大专项"碳酸盐岩缝洞型储层保护技术配套"(2008ZX05049-003-03);"海相碳酸盐岩层系安全钻井及储层改造关键技术研究"(2008ZX05005-006-08HZ)

摘　　要：为实现高酸性裂缝性碳酸盐岩气藏的安全钻井和气层的及时发现,以四川盆地川东北探区碳酸盐岩储层为研究对象,开展了钻井完井随钻暂堵堵漏及储层保护技术的研究。现场资料、X衍射及SEM分析表明,研究区H2S与CO2体积分数高,敏感矿物发育,井漏等钻井安全事故频发,储层损害十分严重,影响了探区天然气勘探开发的进程。针对储层及钻井安全问题,开展了裂缝宽度预测技术、暂堵剂加量优化技术和暂堵防漏堵漏技术的研究。然后以此为基础,根据工区储层地质及工程要求,设计了低土相的两性聚磺/聚醇甲酸钾屏蔽暂堵钻井完井液体系。室内实验显示:该体系的暂堵率和渗透率恢复率均在98%以上,屏蔽环承压可达25 MPa。现场试验表明研究成果适用于南方探区,减少了漏失的发生,促进了油气层发现,提高了单井产量。Temporary plugging while drilling and formation damage control are studied in the process of drilling and well completion, taking the fractured carbonate reservoir in northeastern Sichuan Basin as an example, in order to realize the safe drilling and discovery of oil reservoir in time in the fractured carbonate gas reservoir with high-content sour gas. Field data and the analysis of X diffraction and SEM indicate that there is high-content CO2 and H2S in study area, that sensitive mineral developed, that drilling safe accidents of lost circulation and so on frequently occurred and the formation damage was serious, which delayed the exploration and development of natural gas. Aiming at the problems of reservoir and drilling safety, some techniques are discussed, including fracture width prediction, drilling-in fluid, temporary plugging additive optimization and temporary plugging of lost circulation. Based on related matching techniques, the temporary plugging drilling-in fluid system with low bentonite/amphoteric sulfonie/poly alcohol potassium formate is designed according to the requirement of reservoir geology and engineering. Laboratory experiment shows that the temporary plugging rate and permeability restoration rate of the system are all over 98%, and the bearing pressure of shielding ring reaches 25 MPa. Field experiments reveal that the research result is suit for the southern areas, which can reduce the leakage to occur, promotes the discovery of reservoir and improves the single well production.

关 键 词：碳酸盐岩 气层 裂缝 钻井 完井 储层保护 

分 类 号：TE258[石油与天然气工程—油气井工程]