页岩气井双暂堵压裂技术研究与现场试验  

The Research and Field Testing of Dual Temporary Plugging Fracturing Technology for Shale Gas Wells

作　　者：夏海帮 XIA Haibang(Sinopec Chongqing Shale Gas Co.,Ltd.,Chongqing,408400,China)

机构地区：[1]中石化重庆页岩气有限公司,重庆408400

出　　处：《石油钻探技术》2020年第3期90-96,共7页Petroleum Drilling Techniques

基　　金：国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(编号:2016ZX05061)资助。

摘　　要：针对页岩气井暂堵压裂过程中存在暂堵压力升高不明显、施工压力未传递到裂缝内部、簇间暂堵与缝内暂堵无法有机结合等问题,通过选用压差聚合胶结型暂堵剂GTF-SM,并优化其用量及暂堵压裂工艺,形成了页岩气井双暂堵压裂技术。该技术在南川页岩气田LQ-1HF井分段压裂中试验了10段,与常规压裂井段相比,簇间暂堵试验井段的暂堵压力平均提高了4.3 MPa,缝内暂堵试验井段的暂堵压力平均提高了0.82 MPa,而且试验井段的裂缝长度平均增加了5.8%,裂缝面积平均增加了12.5%。该井采用ϕ10.0 mm油嘴放喷测试,平均产气量23.37×10^4 m^3/d,平均套压20.17 MPa,产液量277.44 m^3/d,优于同区块采用常规压裂技术的页岩气井。试验结果表明,页岩气井双暂堵压裂技术能够形成较好的复杂缝网,可以满足页岩气田高效开发及压裂作业降本增效的需求,具有良好的推广应用价值。Temporary plugging fracturing of shale gas wells has been challenged by the problems of insignificant temporary plugging pressure increases,the fact that the temporary plugging pressure sometimes does not transmit to the fracture,and sometimes unsuccessful combinations of inter-cluster temporary plugging and intra-fracture temporary plugging.Hence,a dual temporary plugging fracturing technology for shale gas wells was developed by adopting a GTF-SM differential pressure polymer-cemented temporary plugging agent and optimizing its dosage.It was also necessary to optimize inter-cluster temporary plugging and intra-fracture temporary plugging fracturing processes.This technology was tested for 10 stages in the staged fracturing of Well Jiaoye LQ-1HF in the Nanchuan Shale Gas Field.Compared with the stages treated with the conventional fracturing technologies,the temporary plugging pressure of the inter-cluster temporary plugging test section was increased by 4.3 MPa,and the temporary plugging pressure of the intra-fracture temporary plugging test section was increased by 0.82 MPa.The fracture length of the test section was increased by 5.8%,and the fracture area was increased by 12.5%on average.The well was tested with aϕ10.0 mm choke,and the average gas production was 23.37×10^4 m^3/d,the average casing pressure was 20.17 MPa and the fluid production was 277.44 m^3/d,which were advantageous over those of the conventional fracturing technologies.The test results showed that the dual temporary plugging fracturing technology for shale gas wells could form a better complex fracture network and enable the high-efficiency development and cost-effective fracturing of shale gas fields,hence showing a good value for wide adoption and application.

关 键 词：簇间暂堵 缝内暂堵 页岩气 分段压裂 复杂缝网 LQ-1HF井 南川页岩气田 

分 类 号：TE357[石油与天然气工程—油气田开发工程]