摘要
多级脉冲气体加载压裂松弛岩层地应力、压裂地层的过程中,通过引入加权函数,应用弹性力学、断裂力学理论建立了多裂缝条件下裂缝起裂扩展模型,并采用与时间相关的爆生气体压力分布方程,模拟了爆生气体驱动下缝长、缝宽的变化过程,分析了不同裂缝参数对产能和表皮系数的影响。结果表明,裂缝起裂后向前延伸直到止裂,止裂后裂缝会发生一定程度的闭合;不同的裂缝条数会产生不同的最终缝长;多极脉冲气体加载压裂能够显著增加油井产量,降低储层表皮系数,裂缝的长度对油井产量的增加起决定作用,在压裂弹能量一定的情况下应该设计增加裂缝长度,减少裂缝条数。实现了对多级脉冲气体加载压裂的优化与控制。
For formation fracturing with multi -pulse gas load, the fracture generation and propagation model under multi fractures propagation is established with the application of elasticity and fracture mechanics theories and weighting function. The change of fracture length and fracture width under the expulsion of gas generated from explosion has been simulated based on the time - relative pressure distribution equations for the gas generated from explosion, and the effect of different fracture parameters on productivity and skin factor has been analyzed. The result shows, after initiation of the fracture it will extend forward until it ceases, and it can be closed to some certain degree; different numbers of fracture may form different ultimate fracture length; the multi- pulse gas load fracturing can remarkably increase oil production and decrease skin factor. Fracture length is dominant to the increase of oil production. Under definite fracturing elasticity, it is better to design longer fracture and less number of fractures. Then the multi-pulse gas load fracturing can be op- timized and controlled.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2007年第6期99-101,106,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
"国家西部科技行动计划"重大攻关项目(2005BA901A13)
陕西省重大科技攻关专项计划项目(2006kz01-G2)
中石油创新基金(05E7038)
关键词
多级脉冲
气体压裂
裂缝扩展
增产效果
multi-pulse
gas fracturing
fracture propagation
stimulation effect
