非裂缝型砂岩储层缝网压裂技术FRACTURE NETWORK FRACTURING TECHNIQUE FOR NONFRACTURE-TYPE SANDSTONE RESERVOIR
王秀臣,杨成彬,张有才,杨东,林庆祥,王守坤
WANG Xiuchen,YANG Chengbin,ZHANG Youcai,YANG Dong,LIN Qingxiang,WANG Shoukun
摘要(Abstract)：
为了保证致密砂岩储层的压裂成功率和改造效果,研究了缝网形成机理和主控因素。通过压裂裂缝扩展分析,确定缝网形成的条件是产生应力释放缝,与主裂缝的夹角为75°。通过分析应力释放缝的岩石力学性质、净压力、最小主应力及应力差等力学影响因素,以及致密储层缝网形成机理,明确了影响缝网形成的主要控制因素,建立了工艺选井选层方法,并以实现缝网压裂为目标进行缝网压裂工艺优化。通过现场试验,建立了一套适合大庆致密油气储层的缝网压裂技术,明显提高了该类储层压后产能。
In order to ensure the fracturing success ratio and stimulated effects of the tight sandstone reservoir,the forming mechanism and main controlling factors of the fracture network are studied.By analyzing the fractures expansion,the forming conditions of the network are confirmed:generating the releasing stress fractures and 75° included angle with the main fracture.Through analyzing the mechanical influencing factors of the stress fractures,including the mechanical properties of the rocks,net pressure,minimum principal stress,stress difference and so on,and moreover the forming mechanism of the tight reservoir network,the main controlling factors of influencing the production of the network are made clear,and then the choosing technical methods for the wells and layers are determined.At the same time,the network fracturing technology is optimized taking the aim of realizing the network fracturing.By means of the field tests,a set of fracture network fracturing technique for Daqing tight oil and gas reservoirs is established,thus the productivity after the fracturing of this kind of the reservoir is obviously enhanced.
关键词(KeyWords)：
致密砂岩储层;缝网压裂;应力释放缝;净压力;内聚力;内摩擦角;大庆油田
tight sandstone reservoir;fracture network fracturing;stress releasing fracture;net pressure;cohesion/cohesive force;internal friction angle;Daqing Oilfield
基金项目(Foundation): 中国石油天然气股份公司重大科技专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(2012E2603-08)
作者(Author):
王秀臣,杨成彬,张有才,杨东,林庆祥,王守坤
WANG Xiuchen,YANG Chengbin,ZHANG Youcai,YANG Dong,LIN Qingxiang,WANG Shoukun
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