顺北油田断溶体储集层特征及损害预防  

Characteristics and Damage Prevention of Fault⁃Karst Reservoirs in Shunbei Oilfield

作　　者：方俊伟[1,2] 董晓强 李雄[3,4] 张国 吴雄军[3,4] FANG Junwei;DONG Xiaoqiang;LI Xiong;ZHANG Guo;WU Xiongjun(Sinopec,Research Institute of Petroleum Engineering Technology,Northwest Oilfield Company,Urumqi,Xinjiang 830011,China;Sinopec,Key Laboratory of Enhanced Oil Recovery for Carbonate Fracture-Cavity Reservoirs,Urumqi,Xinjiang 830011,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 100101,China;Research Institute of Petroleum Engineering Technology,Sinopec,Beijing 100101,China)

机构地区：[1]中国石化西北油田分公司石油工程技术研究院,乌鲁木齐830011 [2]中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室,乌鲁木齐830011 [3]页岩油气富集机理与有效开发国家重点实验室,北京100101 [4]中国石化石油工程技术研究院,北京100101

出　　处：《新疆石油地质》2021年第2期201-205,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05061);国家自然科学基金(51490650);中国石化科技部项目(P18021-4);国家重点研发计划(2019YFC0604904)。

摘　　要：顺北油田储集层埋藏深、裂缝发育、非均质性强。为保证钻井安全,通常采用正压差钻井,但较高密度钻井液对储集层的损害较大。根据岩性和储集空间特征,以及表面润湿性、敏感性、岩石力学特征和储集层段钻井液体系分析,钻井液对储集层的损害主要体现在大量低酸溶率固相侵入并堵塞缝隙、较大毛细管力造成气层水相圈闭及水锁、钻井液耐温性能差造成沉降以及过高正压差等。针对顺北一区储集层基质致密、非均质性强的特点,提出了降低储集层伤害的预防措施,即通过"物理封堵-滤液表面活性控制和水化抑制-力学近平衡"的方法,减少漏失量和固相侵入量及深度、提高随钻封堵时效,达到保护储集层的目的。The reservoirs in Shunbei oilfield are characterized by deep burial depth,developed fractures and strong heterogeneity.In order to ensure the safety of drilling,drilling operation at positive pressure difference is usually followed,however,the high⁃density drilling fluid used may damage the reservoir.After analyzing the lithology,reservoir space,surface wettability,sensitivity,rock mechanical characteris⁃tics and the drilling fluid system used in the reservoir interval,it’s found that the damage of the drilling fluid to the reservoir is mainly re⁃flected in such aspects as a large amount of solid phase with low acid solubility invading the reservoir and blocking the fractures,large cap⁃illary force causing aqueous phase trapping and water lock in the gas layer,and the drilling fluid with poor temperature resistance causing settlement and excessively high positive pressure difference.In view of the tight matrix and strong heterogeneity of the reservoir in Shunbei Block 1,preventive measures to reduce reservoir damage are proposed,namely“physical plugging⁃filtrate surfactant control,and hydration inhibition⁃mechanical approximate balance”,to reduce fluid loss,decrease solid⁃phase invasion and depth,improve the plugging perfor⁃mance while drilling,and protect the reservoir.

关 键 词：顺北油田 断溶体储集层 走滑断裂 储集层伤害 钻井液 损害方式 

分 类 号：TE135.3[石油与天然气工程—油气勘探]