摘要
四川盆地威远地区志留系龙马溪组页岩气压裂过程中存在压裂井套管变形和周边井受压裂干扰产量波动的问题.为了有效评价页岩气压裂效果,查明压裂井套管变形、周边井产量波动的原因,以四川盆地威远地区X平台微地震监测为例,开展了页岩气压裂微地震监测技术研究与应用.结果表明:(1)基于微地震事件计算的储层改造体积可定性评价压裂效果,一般压裂规模越大,压裂改造体积越大,压后产量也越高;(2)根据微地震监测结果实时调整暂堵剂加入时机和尝试多次暂堵,可提高人工压裂裂缝的复杂度,同时降低可能引起套管变形的天然裂缝活化;(3)与人工压裂裂缝方向一致的天然裂缝不易引起套管变形,与人工压裂裂缝方向不一致的天然裂缝的剪切滑移是套管变形的重要因素;(4)压裂液在压裂层段积累,形成高压力带,逐渐驱动压裂液沿着天然裂缝或储层孔隙通道向周边井的低压力带渗流,造成X平台周边井产量波动.以上认识,对页岩气高效开发具有一定指导意义.
In the process of gas fracturing of Silurian Longmaxi formation shale in Weiyuan area,Sichuan Basin,there are problems of casing deformation of fracturing wells and production fluctuation of surrounding wells disturbed by fracturing.In order to effectively evaluate the effect of shale gas fracturing and find out the causes of casing deformation of fracturing wells and production fluctuation of surrounding wells,taking the microseismic monitoring of X platform in Weiyuan area of Sichuan Basin as an example,the research and application of shale gas fracturing microseismic monitoring technology are carried out.The results show that:(1)The reservoir reconstruction volume calculated based on microseismic events can qualitatively evaluate the fracturing effect.Generally,the larger the fracturing scale is,the larger the fracturing reconstruction volume is,and the higher the post fracturing production is;(2)According to the microseismic monitoring results,real-time adjustment of the time of adding temporary plugging agent and multiple attempts of temporary plugging can improve the complexity of artificial fracturing fractures and reduce the activation of natural fractures that may cause casing deformation;(3)The natural fracture with the same direction as the artificial fracturing fracture is not easy to cause casing deformation.The shear slip of the natural fracture with the different direction is an important factor of casing deformation;(4)The fracturing fluid accumulates in the fracturing interval to form a high pressure zone,which gradually drives the fracturing fluid to flow along the natural fracture or reservoir pore channel to the low pressure zone of the surrounding wells,resulting in the production fluctuation of the wells around platform X.The above achievements have certain guiding significance for the efficient development of shale gas.
作者
赵超峰
王海波
郭伟
张伟
范青云
田建涛
陈浩
唐大明
赵建宇
ZHAO ChaoFeng;WANG HaiBo;GUO Wei;ZHANG Wei;FAN QingYun;TIAN JianTao;CHEN Hao;TANG DaMing;ZHAO JianYu(College of Earth Science,Northeast Petroleum University,Daqing 163318,China;Liaohe Geophysical Exploration Company,BGP Inc.,CNPC,Panjin 124010,China;Panzhihua University,Panzhihua 617000,China;Geology Research Institute,CNPC Greatwall Driling Company,Panjin 124010,China;Liaohe Oilfield Company Shuguang Oil Production Plant,Panjin 124010,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第5期2089-2096,共8页
Progress in Geophysics
关键词
微地震监测
页岩气
威远地区
压裂效果评价
天然裂缝
Microseismic monitoring
Shale gas
Weiyuan area
Fracturing effect evaluation
Natural fracture
