塔河油田深侧钻井防塌钻井液技术  

Anti-Sloughing Drilling Fluid Technology for Deep Sidetracking Wells in the Tahe Oilfield

作　　者：黄维安[1] 牛晓[2] 沈青云[2] 周伟[2] 杨世超 邱正松[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石化西北油田分公司工程技术研究院,新疆乌鲁木齐830011 [3]中石化胜利石油工程有限公司钻井工程技术公司,山东东营257064

出　　处：《石油钻探技术》2016年第2期51-57,共7页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目"海洋深水水基钻井液恒流变性调控的化学;物理方法研究"(编号:51374233);国家科技重大专项课题"复杂地质条件下深井钻完井液新技术研究"(编号:2011ZX05021-004);山东省自然科学基金项目"海洋深水水基钻井液恒流变性调控物理方法及其机理"(编号:ZR2013EEM032)联合资助

摘　　要：塔河油田深部巴楚组和桑塔木组地层为以伊/蒙混层或伊利石为主的硬脆性泥页岩地层,水化分散性较强且发育有微裂缝,钻井过程中易因泥页岩水化而导致井壁失稳,为此,提出了＂抑制表面水化-物化封堵-有效应力支撑＂三元协同防塌对策,并构建了三元协同防塌钻井液。室内性能评价试验结果表明：三元协同防塌钻井液抗温达170℃、抗盐5.0%、抗钙0.5%~1.0%、抗劣土8.0%,泥页岩膨胀率和滚动回收率分别为5.05%和91.33%,能封堵宽400μm的裂缝,承压能力达到4 MPa。三元协同防塌钻井液在塔河油田20余口井进行了应用,均未发生由于井壁失稳造成的井下故障,桑巴楚组和桑塔木组地层的井径扩大率平均降低63.4百分点,建井周期平均缩短4.3d。这表明,三元协同钻井液防塌技术可有效解决塔河油田深侧钻井巴楚组和桑塔木组地层的井壁失稳问题。The deep Bachu and Sangtamu Formation in the Tahe Oilfield are composed of an illitemontmorillonite mixed layer or hard brittle shale formations dominated by illite with strong water dispersion and development of micro-fractures.During drilling operations,wellbore instability can be encountered due to shale hydration.To eliminate these problems,a coordinated anti-collapse program with three elements was developed：sealing and consolidating the side well,inhibiting surface hydration and providing the effective stress support by reasonable drilling fluid density.In addition,anti-collapsing drilling fluids were developed.The evaluation results showed that the newly developed three-element anti-collapse drilling fluid had a temperature tolerance of 170 ℃,preferable contamination resistibility（5%NaCl,0.5%-1% CaCl2,and 8% poor clay）strong anti-collapsing capacity（5.05% of shale swelling ratio and 91.33% rolling recovery rate）and favorable well-sealing performances（4MPa of pressure-bearing capacity for 400μm simulated fractures）.Successful field applications were carried out in the Tahe Oilfield more than 20 wells.There were no downhole problems induced by wellbore instability.The average expansion rate was reduced by 63.4%compared with completed adjacent wells in the same block.The construction period was shorted by 4.3d.Results showed that the wellbore instability problems of deep sidetracking wells in the Tahe Oilfield can be overcome through the effective deployment of a three-element anti-collapse drilling fluid technology.

关 键 词：深井 侧钻 井眼稳定 防塌钻井液 钻井液性能 塔河油田 

分 类 号：TE254[石油与天然气工程—油气井工程]