低渗透油藏矩形井网水力压裂适应性研究

摘要

Hydraulic fracturing is an important stimulation technique for low permeability reservoir. Rectangular well pattern has some advantages, such as the high ratio of injection well to production well, high strength of injection water,it can improve the production and injectivity ,so it is one of important well pattern in low permeability reservoir. The adaptability of rectangular pattern is studied. Therefore better development effect in low permeability reservoir can be obtained. Moreover the development effects are studied considering the change of ratio of fracture length to distance between wells and fracture conductivity under different well pattern. The results show that for the rectangle pattern with fixed well spacing, it is not necessary that larger well array, larger ratio of fracture length to distance between wells and lager flow conductivity will lead to better post fracture effect. Instead, there exists a reasonable range.%水力压裂技术是低渗透油藏增产改造的主要措施.矩形井网由于注采井数比高、注水强度大等特点,可以提高油井产能和注水井注水能力,是目前油田开发的有效井网形式之一.针对低渗透油藏的地质特点,对矩形井网在低渗透油田水力压裂中的适应性进行了研究.结果表明,对低渗透油田,采用矩形井网开发能获得较好效果.研究了矩形井网在不同井距和排距条件下裂缝长度和导流能力变化对压裂井产能等开发指标的影响.研究结果表明:对于矩形井网,井距一定,压裂效果并非排距、缝长比和导流能力越大越好,而是存在一个合适的范围.