裂缝性气藏成膜堵气钻井液体系室内评价研究

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英文篇名：Laboratory research of sealing and gas-plugging drilling fluid system in fractured gas reservoir 作者：朱杰 ; 熊汉桥 ; 吴若宁 ; 王启任 ; 孙运昌 英文作者：ZHU Jie;XIONG Hanqiao;WU Ruoning;WANG Qiren;SUN Yunchang;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering,Southwest Petroleum University; 关键词：裂缝性气藏 ; 成膜剂 ; 随钻封堵 ; 成膜堵气钻井液 ; 承压实验 英文关键词：fractured gas reservoir;;film forming agent;;plugging while drilling;;sealing and gas-plugging drilling fluid system;;bearing test 中文刊名：SYZC 英文刊名：Oil Drilling & Production Technology 机构：西南石油大学油气藏地质及开发工程国家重点实验室; 出版日期：2019-03-20 出版单位：石油钻采工艺 年：2019 期：v.41;No.242 语种：中文; 页：SYZC201902005 页数：5 CN：02 ISSN：13-1072/TE 分类号：28-32

摘要

顺南区块气藏微裂缝发育,钻井时存在气侵严重、溢漏频发等问题,为此,进行了物理+化学成膜封堵技术研究。制备了0.01、0.05、0.1 mm裂缝开度的人造裂缝岩心,通过砂床实验、静态承压实验优选出了成膜剂CY-1、纳米碳酸钙、纳米二氧化硅等关键封堵材料并确定了其最优加量,形成了密度1.68g/cm~3的成膜封堵钻井液体系:膨润土浆+0.4%KAPM+3%SPNH+3%SMP+2%FT-1+1%PAC-LV+2%CY-1+1%纳米二氧化硅+2%纳米碳酸钙+重晶石,并对其性能进行了评价。结果表明:该钻井液体系抗温200℃,中压失水6.8 mL、高温高压失水8.8 mL,滤饼酸溶率24.9%。该物理+化学成膜封堵钻井液体系可有效解决顺南区块钻井过程中气侵问题。
        The gas reservoirs in Shunnan Block are characterized by developed micro-fractures, and they are suffered from serious gas cut and frequent leakage in the process of well drilling. To solve these problems, the physical+chemical film plugging technology was researched. Firstly, the cores with artificial fractures(fracture aperture 0.01, 0.05 and 0.1 mm) were prepared. Then,the key plugging materials were selected by means of sand bed test and static bearing test, including film forming agent CY-1, nanocalcium carbonate and nano-silica, and their optimal dosages were determined. Thus, the film plugging drilling fluid system with the density of 1.68 g/cm~3 were developed, i.e., bentonite slurry+0.4% KAPM+3% SPNH+3% SMP+2% FT-1+1% PAC-LV+2% CY-1+1% nano-silica+2% nano-calcium carbonate+barite. Finally, its properties were evaluated. It is shown that this drilling fluid system has temperature resistance of 200 ℃, medium pressure fluid loss of 6.8 mL, high temperature and high pressure fluid loss of 8.8 mL and filter cake acid solubility of 24.9%. In conclusion, this physical+chemical film plugging drilling fluid system can solve the problem of gas cut in the process of well drilling in Shunnan Block.

引文

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