乌石17-2油田强封堵合成基钻井液体系  

A Synthetic Based Drilling Fluid with Strong Plugging Capacity for Block Wushi17-2

作　　者：马磊 袁学强 张万栋 曹峰 邓文彪 张雪菲 杨丽丽[2] MA Lei;YUAN Xueqiang;ZHANG Wandong;CAO Feng;DENG Wenbiao;ZHANG Xuefei;YANG Lili(Zhanjiang Branch of CNOOC Ltd.,Zhanjiang,Guangdong 524051;China University of Petroleum(Beijing),MOE Key Laboratory of Petroleum Engineering,Beijing102239)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524051 [2]中国石油大学(北京),石油工程教育部重点实验室,北京102239

出　　处：《钻井液与完井液》2022年第5期558-564,共7页Drilling Fluid & Completion Fluid

基　　金：中海石油(中国)有限公司科研项目“南海西部油田上产2000万方钻完井关键技术研究”课题(CNOOCKJ135ZDXM38 ZJ 05 ZJ)子课题3任务“乌石17-2油田钻完井液体系储层保护技术研究”。

摘　　要：乌石17-2油田是南海西部油气藏的重要组成部分,具有重大的勘探开发前景。然而,该区块存在严重的井壁失稳、漏失及储层损害等潜在问题,对钻井液性能提出严峻考验。同时该区块处于国家自然保护区附近,对钻井液环保性要求极高。基于此,该研究提出以气制油作为基液,制备高性能合成基钻井液的研究思路,并优选主、辅乳化剂及高效封堵剂OSD-2,最终形成了一套密度达到1.5 g/cm^(3)、抗温达150℃、高温高压滤失量不大于5 mL,破乳电压不小于400 V的高性能合成基钻井液体系。此外,该体系具有优异的流变稳定性、润滑性、抑制能力和抗劣质红土侵污染性能,可以满足现场施工要求,并有效解决现场存在的工程问题。The block Wushi17-2 is an important part of the Nanhai West Oilfield and has significant exploration and development prospects.However,there are severe potential downhole problems encountered during drilling operations,such as borehole wall instability,mud losses and formation damage,has imposed serious challenges to the properties of drilling fluids.Since this block is located nearby a national nature reserve,the environmental friendly performance of drilling fluids remains a great challenging.To deal with these problems,this study proposes the research idea of formulating high performance synthetic based drilling fluid with gas-to-liquid(GTL),followed by optimizing with a primary emulsifier,a secondary emulsifier and a high efficiency plugging agent OSD-2,eventually formulating a synthetic based drilling fluid with a density of 1.5 g/cm^(3),a temperature resistance of 150℃,a high temperature high pressure filtration rate of less than 5 mL and an electric stability of greater than 400 V.The synthetic based drilling fluid has excellent rheology,lubricity,inhibitive capacity and resistance to clay contamination(resistant to contamination of 10%poor-quality clay).The synthetic based drilling fluid satisfied the demands of field operation and helped to solve drilling fluid-related problems during drilling process.

关 键 词：合成基钻井液 井壁稳定 储层损害 漏失 强封堵 

分 类 号：TE254.3[石油与天然气工程—油气井工程]