暂堵均衡压裂技术在临兴深煤层储层改造中的应用

Application of temporary plugging and balanced fracturing technology in the reservoir stimulation of Linxing deep coalbed

摘要:

临兴区块定向井纵向上发育多套煤层系，非均质性强，常规压裂工艺因无法实现储层均匀改造，导致高渗层段过度扩展而低渗层段改造不足，严重影响开发效果。通过合理优化区块LX36-XXD井压裂设计参数，使用可溶绳结暂堵球实现暂堵压裂，暂堵后施工压力上涨明显，验证了压裂方案设计的合理性。裂缝形态模拟表明，加入暂堵剂后，8、9号煤层均得到有效改造，暂堵均衡压裂效果明显，压裂有效改造体积SRV提高了18.2%，初产达0.8×10⁴ m³/d，验证了暂堵均衡压裂对非均质性强储层的适应性，展现出显著的技术优势，为深部煤层气高效开发提供了重要技术参考，未来可进一步探索其在水平井密切割压裂中的推广价值。

Abstract:

In the Linxing Block， multiple coalbed series with strong heterogeneity are vertically developped in directional wells. Conventional fracturing technology fails to achieve uniform reservoir stimulation， leading to over-expansion of high-permeability intervals and insufficient stimulation of low-permeability intervals， which seriously affects development efficiency. By reasonably optimizing the fracturing design parameters of Well LX36-XXD in the block， soluble knot-type temporary plugging balls were used to realize temporary plugging fracturing. After temporary plugging， the construction pressure increased significantly， verifying the rationality of the fracturing scheme design. The fracture morphology simulation showed that after adding temporary plugging agents， both No.8 and No.9 coal seams were effectively stimulated， with obvious temporary plugging balanced fracturing effects. The effective stimulated reservoir volume （SRV） increased by 18.2%， and the initial production reached 0.8×10?m3/d. This verifies the adaptability of temporary plugging balanced fracturing to reservoirs with strong heterogeneity， demonstrating significant technical advantages. It provides an important technical reference for the efficient development of deep coalbed methane， and its promotion value in tight-cut fracturing of horizontal wells can be further explored in the future.