煤系储层综合开发中的压裂射孔方案优化研究

doi:10.3969/j.issn.1006-6535.2021.01.023

摘要/Abstract

摘要： 针对鄂尔多斯盆地东缘临兴-神府区块3种典型的煤系储层岩性组合赋存模式,利用数值模拟方法,分析射孔位置与射孔打开程度对裂缝在层间、层内扩展延伸能力的影响,以裂缝穿层扩展能力和裂缝延伸长度为评价指标,研究了砂岩-煤层接触、砂岩-煤层-泥岩互层和煤层-砂岩-煤层多煤层3种模式下的多储层合层压裂射孔方案,提高煤系储层油气资源综合利用效率。结果表明:层间界面对能量的传播产生明显的负效应;煤层-砂岩-煤层多煤层与砂岩-煤层-泥岩互层式储层的射孔比例以50%～80%为宜;砂岩-煤层接触模式储层适宜采用间接压裂工艺,射孔方案为砂岩的70%～75%+煤层的25%～50%。该研究可为煤系多储层合层压裂射孔优化提供参考。

关键词: 煤系储层, 岩性组合, 压裂, 射孔, 临兴-神府区块, 鄂尔多斯盆地

Abstract: For the three typical lithological association occurrence patterns of coal-bearing reservoirs in the Linxing-Shenfu Block on the eastern edge of Ordos Basin,the numerical simulation method is applied to analyze the influence of perforation location and perforation degree on the inter-bed and intra-bed fracture propagation and extension,and the fracture bed-crossing propagation capability and fracture extension length are used as evaluation indexes to study the multi-reservoir fracturing perforation scheme for such three modes as the sandstone-coalseam contact zone,the sandstone-coalseam-mudstone interbed,and the coalseam-sandstone-coalseam multiple coalseams,so as to improve the comprehensive utilization efficiency of oil and gas resources in coal reservoirs.The results show that:the interbed interface has a significant negative effect on energy propagation; the perforation ratio of 50%-80% is appropriate for the coalseam-sandstone-coalseam multiple coalseams and the sandstone-coalseam-mudstone interbed type reservoirs; for the sandstone-coalseam contact type reservoirs,the indirect fracturing process is applicable,and the perforation ratio is 70%-75% for the sandstone and 25%-50% for the coalseam.This study can provide a reference for the optimization of the coal-bearing multi-reservoir fracturing perforation.

Key words: coal-bearing reservoir, lithological association, fracturing, perforation, Linxing-Shenfu Block, Ordos Basin

中图分类号:

TE357.2

张红杰, 刘欣佳, 张潇, 张遂安, 邵冰冰. 煤系储层综合开发中的压裂射孔方案优化研究[J]. 特种油气藏, 2021, 28(1): 154-160.

Zhang Hongjie, Liu Xinjia, Zhang Xiao, Zhang Suian, Shao Bingbing. Study on the Optimization of the Fracturing Perforation Scheme in the Comprehensive Development of Coal-bearing Reservoirs[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 154-160.

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