支撑剂对页岩压裂裂缝应力敏感性影响规律的实验研究OA

To systematically study the influence of proppants on the stress sensitivity of shale fracturing fractures,the fracturing fracture cores with different proppant filling schemes were prepared using two different lithologies of shale in Jimusaer area,Xinjiang to carry out stress sensitivity simulation experiments.The results indicate that under the same proppant filling conditions,due to the stronger plastici-ty of argillaceous siltstone cores,proppant is easily embedded in the fracture surface,resulting in higher stress sensitivity of them com-pared to dolomitic siltstone cores.Appropriately increasing the particle size and concentration of proppants is beneficial for enhancing their support effect on fracturing fractures and reducing their stress sensitivity.The mixed injection of different particle sizes of proppants is more conducive to maintaining the support effect of proppants on fracturing fractures.In the fracturing construction at Jimsar site,a mixed particle size proppant mainly composed of smaller particle size proppants(40/70 mesh)can be used,and the injection volume of proppants can be appropriately increased to reduce the stress sensitivity of the fracturing fractures.