摘要
为掌握应力干扰的优化设计方法和手段,分别建立应力场变化的平面模型和数值模型.采用对比模拟分析的方法,提出压裂滤失引起的孔隙压力升高与人工裂缝支撑对应力场的影响互为反作用,从而导致诱导应力场在裂缝附近存在非转向区域,且可通过优化裂缝间距和缝内净压力来消除非转向区域的论点.研究结果表明：水平主应力差为2MPa,单缝扩展时缝内净压力为16MPa可消除非转向区域;水平差应力为8MPa,净压力为18MPa下,两条裂缝间距为30-60m可消除裂间的非转向区域;水平差应力8MPa和缝间距为20m以下,净压力为19MPa可消除裂间的非转向区域.现场试验时通过水平井段内分簇射孔,并优化施工参数,实现了裂缝间的应力干扰,裂缝复杂程度得以提高.
To investigate the optimization means and methods, this study established planar model and numerical model of stress field, and used the method of comparative simulation to propose the reaction of pore pressure increase caused by fluid leakoff and the influence of propped hydraulic fracture, causing the induced stress field not reorientating in the vicinity of fracture. Besides, the non-reorientating area was eliminated by optimizing the fracture space and net pressure in the fracture. The results show that. the difference of principal horizontal stress is 2 MPa; the net pressure should be 16 MPa at minimum to eliminate nonsreorientation areas when two fracture spread simultaneously and the stress difference is 8 MPa, to eliminate the non-reorientation area, the fracture space should be 30--60 m when the net pressure is 18 MPa, or the net pressure should be 19 MPa at minimum when the fracture space is 20 m. Field test shows that multi-perforation clusters in one stage of horizontal well realize the fractures in- terference and improve the complexity of the fractures.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2014年第4期639-645,共7页
Journal of China University of Mining & Technology
基金
国家科技重大专项(2011ZX05013-003)
中国石油天然气股份公司重大专项
关键词
应力干扰
非转向带
净压力
缝间距
致密油气
stress interference
non-reorientating area
fracture net pressure
fracture space
