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、0.1mm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6.8mL、高温高压失水8.8mL,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.
作者
朱杰
熊汉桥
吴若宁
王启任
孙运昌
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,Chengdu 610500,Sichuan,China)
出处
《石油钻采工艺》
CAS
北大核心
2019年第2期147-151,共5页
Oil Drilling & Production Technology
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
fractured gas reservoir
film forming agent
plugging while drilling
sealing and gas-plugging drilling fluid system
bearing test
