煤层气缝网压裂技术研究

发布时间：2018-11-24 20:58

【摘要】：为解决煤层气活性水改造效果差的难题,基于煤层发育被方解石充填的天然裂缝网络、压裂液滤失量大的特性,提出了新的缝网压裂思路,研制与煤层相适应的复合压裂液体系。潜在酸压裂液酸蚀充填矿物,使裂缝恢复畅通,形成相连通的复杂裂缝网络;清洁压裂液携砂,支撑压开的裂缝。探讨了该思路的可行性和优势,以及与页岩气、砂岩气缝网压裂的区别。分析了沁水盆地南部3号煤和15号煤地质特征,研制了相应的潜在酸压裂液和清洁压裂液,形成"潜在酸酸蚀裂缝充填矿物,清洁压裂液携砂"的缝网压裂技术。与常规活性水压裂对比表明,3号和15号煤层缝网压裂产量高,见气普遍更早。3号煤压裂支撑剂用量更少,15号煤煤层气开发取得历史突破。实践表明煤层气缝网压裂具有可行性。
[Abstract]:In order to solve the problem of poor reconstruction effect of active water for coalbed methane, based on the characteristics of natural fracture network filled with calcite in coal seam and high filtration amount of fracturing fluid, a new fracture network fracturing method is put forward. A compound fracturing fluid system suitable for coal seam is developed. The potential acid fracturing fluid is filled with minerals, the fracture is restored unblocked, a complex fracture network is formed, and the clean fracturing fluid carries sand to support the broken fracture. The feasibility and advantage of this idea and the difference of fracture network fracturing with shale gas and sandstone gas are discussed. The geological characteristics of No. 3 and No. 15 coal in the south of Qinshui Basin are analyzed, and the corresponding potential acid fracturing fluid and clean fracturing fluid are developed to form the fracturing technology of "filling mineral with potential acid corrosion fracture and carrying sand with clean fracturing fluid". The comparison with conventional active water fracturing shows that the fracturing yield of seam No. 3 and No. 15 seam is higher and the gas is found earlier generally, the dosage of No. 3 coal fracturing proppant is less, and the development of No. 15 coal seam methane has made a historical breakthrough. Practice shows that coalbed methane fracture network fracturing is feasible.
【作者单位】：中联煤层气有限责任公司;
【基金】：国家十二五科技重大专项(2011ZX05060)资助
【分类号】：TE377

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