摘要
渝西深层页岩气H202井区H3平台有4口水平井压后测试产量较差,后期平台作业存在较大的不确定性。为了确保平稳作业,针对H3平台进行压裂效果分析。首先,从物质基础、矿物脆性、天然裂缝发育和地应力特征等方面分析该井区页岩储层的可压性,并与典型中浅层和深层页岩气井区进行对比;其次,结合微地震监测技术分析压后裂缝的复杂性;最后,根据压后排采和示踪剂监测情况对比分析H3平台的返排情况和井间连通性。研究认为:H3平台物质基础较好、地层能量充足、矿物脆性较强,但天然裂缝欠发育、应力差较大,形成缝网的难度较大;此外,施工净压力偏低、工艺措施不足导致裂缝复杂程度偏低,小粒径石英砂占比过高、井距过小导致井间连通率偏高,进而降低了压裂效果。建议提高施工排量、采用组合暂堵方式提高裂缝复杂程度,适当加大井距并降低小粒径支撑剂的占比。
The four horizontal wells on the H3 platform of H202 deep shale gas well area in western Chongqing have low test production after fracturing,which brings uncertainty to the later development of the shale gas platform.In order to ensure stable operation,fracturing effect analysis is carried out for H3 platform.Firstly,the compressibility of the H3 platform is analyzed from the aspects of material basis,brittleness,natural fracture development and in-situ stress characteristics,and compared with typical medium-shallow and deep shale gas wells.Secondly,combined with micro-seismic monitoring,the complexity of post compression fracture is analyzed.Finally,the flow back and inter well connectivity of H3 platform are compared and analyzed according to the production after fracturing and tracer monitoring.According to analysis,the H3 platform has a good material basis,sufficient formation energy,and high mineral brittleness,but the natural fractures are underdeveloped and the stress difference is large,making it difficult to form a fracture network.Low construction net pressure and insufficient process measures lead to low fracture complexity,high proportion of small particle size quartz sand and too small well spacing lead to high inter well connectivity,which further reduces the fracturing effect.It is recommended to further increase the construction displacement and use the combined temporary plugging method to increase the complexity of the fracture,appropriately increase the well spacing and reduce the proportion of small particle size proppants.
作者
余致理
肖晖
宋伟
郭高峰
徐吉
梁朝阳
刘辉
胡志国
YU Zhili;XIAO Hui;SONG Wei;GUO Gaofeng;XU Ji;Liang Chaoyang;LIU Hui;HU Zhiguo(Chongqing Gas Mine,Southwest Oil and Gas Field Branch,PetroChina,Chongqing 400021,China;School of Oil and Gas Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2022年第3期29-34,73,共7页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
重庆市自然科学基金重点项目“深层页岩气压裂复杂裂缝形成机理及工艺技术研究”(CSTC2020JCYJ-ZDXMX0001)
重庆市自然科学基金面上项目“页岩压裂楔形裂缝网络中支撑剂运移机理研究”(CSTC2019JCYJ-MSXMX0069)
重庆英才计划“包干制”项目“页岩气区加密井压裂裂缝延伸规律研究”(CSTC2021YCJH-BGZXM0207)。
关键词
深层页岩气
压裂效果
可压性
裂缝监测
井间距
deep shale gas
fracturing effect
compressibility
fracture monitoring
well spacing
