永川深层页岩气藏水平井体积压裂技术

深层页岩气藏水平井压裂存在注入压力高、加砂难、稳产能力低等问题，针对永川龙马溪气藏地质特点，以形成体积压裂缝网为目标，采用优化后的高黏、低黏组合液体及粒径70/140目+40/70目+30/50目组合支撑剂，选择大通径免钻桥塞和可溶桥塞分段工艺，采用地质工程双甜点地球物理预测技术确定分段分簇位置，结合6段制混合注入模式和特殊加砂工艺保证顺利加砂，并配套了射孔优化、缝口暂堵技术、压后闷井方案增加裂缝复杂程度。实施井获得了较好的增产效果，达到体积改造目的。

Volume fracturing for horizontal wells in Yongchuan deep shale gas reservoirs

When a horizontal well is fracked in a deep shale gas reservoir, the injection pressure is high, proppants are hard to be pumped down, and stable production does not sustain. To address these issues, geological characteristics of the Yongchuan Longmaxi reservoir were analyzed. With the goal of creating fracture networks through multistage volume fracturing, the following combinations were used: optimized high-viscosity and low-viscosity fluids, 70/140 + 40/70 + 30/50 mesh proppants and large-bore bridge plugs that are soluble or do not need to be drilled out. A geophysical technology for predicting geological and engineering sweet spots was used to determine the interval of each stage and cluster. Propped fracturing was ensured using a special mixing technique in six-stage mixed injection mode. In addition, fracture complexity was strengthened by perforation optimization, temporary plugging of fracturing mouths, and post-treatment shut-in. Good stimulation performance is obtained in implementation wells and the volume stimulation objectives are obtained.