青海油田乌101区块整体压裂数值模拟研究

水力压裂是低渗透油藏增产改造的主要措施。针对青海油田乌101区块低渗透油藏的地质特点,对压裂井的压裂效果和难点进行了分析;对给定的五点井网进行了整体压裂优化研究,研究了不同裂缝长度和导流能力对压裂井产能的影响,在此基础上采用正交设计方法进行了整体压裂综合研究。结果表明:对于五点井网,井距一定,压裂效果并不是缝长比和导流能力越大越好,而是存在一个合适的范围,并通过正交分析,得到了最优的裂缝参数。

THE STUDY ON RESERVOIR NUMERICAL SIMULATION FOR INTEGRAL FRACTURING IN WU 101 BLOCK OF QINQHAI OIL FIELD

Hydraulic fracturing is an important stimulation technique for low permeability reservoir. This paper analyzed the effects and difficulty of the hydraulic fractured wells according to the geology character of low-permeability reservoir for Wu 101 Block in Qinghai oilfield, and studied the effect of the ratio of fracture length to distance between wells and fracture conductivity on production in five-spot well pattern using integral fracturing optimal method. The comprehensive analysis of the integral fracturing was made based on the orthogonal experimental design. The results shows that for the five-spot well pattern with fixed well spacing, it is not necessary that 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. This paper obtained the optimal fracture parameters using the method of the orthogonal experimental design.