威荣深层页岩埋深大（3 500~4 200 m）、地应力高、地应力差异大（7~17 MPa）、储层脆性低（＜0.5）、天然裂缝不发育,压裂改造面临施工压力高、压力窗口窄、敏感砂比低、加砂难度大。大型物模实验表明,威荣页岩压裂裂缝形态以主缝+分支缝为主,裂缝复杂程度低,压裂易形成双翼缝。在地质工程一体化的基础上,结合地质甜点优化分段分簇,进一步细分切割地层。通过支撑剂运移规律研究,优化了三级粒径支撑剂铺置方式和注入时机,提高了加砂强度。通过复合暂堵转向压裂工艺提高了裂缝横向复杂程度,并通过缝内暂堵、优化施工排量和液体黏度,提高缝内净压力及裂缝复杂程度,从而提高压裂改造体积和控制储量。研究成果在威荣气田得到了成功应用,加砂强度提高至1.95 t/m,压后单井平均无阻流量为38.5×10⁴ m³/d,单井EUR（估算最终可采储量）为0.9×10⁸ m³,改造效果较前期显著提高。压后评估可知,压裂效果与加砂强度成正相关关系。因此,深层页岩气如何提高加砂强度、控制用液强度,是经济有效压裂的关键。

Due to the deep buried depth（3 500~4 200 m）, high ground stress, high ground stress discrepancy（7 to 17 MPa）, low reservoir brittle（< 0.5） and the undeveloped natural fracture, the hydraulic fracture of Weirong deep shale gas face the problems of high fracturing construction pressure, narrower pressure window, low sensitive sand concentration, high fracturing difficulty. Large-scale physical model experiments show that the morphology of Weirong shale fractures are composed of main fracture and branch fracture, within low fracture complexity and forming bedding seam more easily. On the basis of geology-engineering integration, the stratigraphic segmentation and clustering are optimized in combination with geological sweet spot. Through the study of the proppant transport, the placement mode and injection timing of the three-grade particle size proppant have been optimized, which increase the sand loading. The transverse complexity of fractures is improved by the combined temporary plugging steering fracturing technology. The net pressure and complexity of fractures are improved by the temporary plugging in the fractures and the optimization of construction discharge and liquid viscosity, thereby improving the fracturing volume and control reserves. The research results have been successfully applied in Weirong Gas Field. The sand loading has been increased to 1.95 t/m, the average open flow per well is 38.5×10⁴ m³/d, and the single well EUR is 90×10⁸ m³. All those shows a significantly improvement compared with the previous stage. Post-pressure evaluation shows that the fracturing effect is positively correlated with the sand adding strength. Therefore, how to improve the sand adding strength and control the strength of the liquid used in deep shale gas is the key to economic and effective fracturing.