海上低渗透储层微压裂注水新工艺

A New Technique of Micro Fracturing Water Flooding in Offshore Low Permeability Reservoir

为解决海上低渗透储层注水井堵塞问题,提出采用微压裂注水新工艺技术。采用微压裂注水工艺技术,利用计算模型得到裂缝扩展特征和规律。在此基础上,提出最佳注入速度,并根据注入速度与井底压力变化关系,结合瞬间碰撞动力学原理,得到瞬间膨胀压力。数值模拟表明,阶梯式和跳跃式微压裂注水新工艺技术的应用,降低了施工难度,增强了该技术应用的可操作性和安全性。

For the plugging problem of injection wells in offshore low permeability reservoir, this paper proposes the technique of micro fracturing water flooding. With this technique, the characteristics and pattern of fracture propagation are obtained by the application of computer model. The optimal injection rate is proposed according to the relationship between the changes of velocity and the bottom pressure and calculated collision force, according to collision kinematics principles. Numerical simulation shows that stepped micro fracturing water flooding and leaping micro fracturing water flooding decrease the construction difficulty and enhance the security and flexibility of on-site application.