玛湖油田压后返排支撑剂回流规律研究

Studying on the Rule of Return Proppant Flowback Law after Fracturing in Mahu Oilfield

为研究水力压裂压后返排过程中支撑剂回流的影响因素,利用裂缝模拟装置进行室内试验,用正交试验分析方法确定影响支撑剂回流的主控因素,通过模拟储层实际闭合压力得到在不同流量条件下支撑剂回流的临界流速。试验结果表明:支撑剂粒径变小、压裂液黏度增大或铺砂浓度增大时,支撑剂回流的临界流量会逐渐变小,而对于闭合压力则出现相反的趋势。

To study the factor of proppant flowback after hydraulic fracturing, a laboratory test was con-ducted by using fracture simulation device, and orthogonal test analysis method was used to de-termine the main control factors of the proppant flowback in the process, its critical flow rate was obtained through the simulation of actual reservoir closing pressure. The result indicates that when grain size of the proppant becomes small, fracturing viscosity increases or the sand laying concentration increases, its critical flow rate becomes small gradually, while its closed pressure is in the opposite trend.