渝西区块页岩气储层改造优化对策与适应性分析
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沈骋(1990—),男,四川成都人,工程师,博士,从事页岩气增产改造理论与技术等方面的研究。E-mail:Shencheng2018@petrochina.com.cn。

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中国石油天然气集团有限公司重大工程技术现场试验科学研究与技术开发项目“深层页岩气有效开采关键技术攻关与试验”(2019F-31)。


Optimization strategies and adaptability analysis of shale gas reservoir stimulation in western Chongqing Block
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    泸州—渝西深层页岩气区块分布面积占四川盆地南部的86%,其中奥陶系五峰组—志留系龙马溪组是进一步实现天然气规模上产的主力储层。其中,渝西区块面临诸多地质挑战,包括储层厚度偏薄,地质工程“双甜点”汇聚在同层,孔缝连通性较差,埋藏深度大,断裂系统发育和地应力条件苛刻等。基于区块内已实施井的地质与工程参数,结合页岩气缝网压裂理论,采用大数据分析方法,形成应对不同地质挑战的压裂工艺优化措施,包括龙马溪组一段一亚段1小层(龙一11)高钻遇率、高用液强度、密簇间距、高加砂强度、大施工排量和暂堵转向工艺等,并对已压井压裂参数进行适应性分析,以验证优化措施的可行性,提出适用于渝西区块的缝网压裂参数模板,最终应用于矿场实现缝网压裂,单井裂缝复杂度和储层改造体积较早期3簇井分别提升60.59%和38.3%,并整体获得高产,单井测试日产量较早期已压井提升68.67%,累积产量大幅提升,为深层页岩气高效开发奠定了基础。

    Abstract:

    The distribution area of deep shale gas blocks in Luzhou-western Chongqing area accounts for 86% of the southern Sichuan Basin,and the Ordovician Wufeng Formation-Silurian Longmaxi Formation are the main reservoirs for further large-scale production of natural gas. However,the reservoirs in the western Chongqing Block faces many geological challenges,including thin reservoirs,“dual sweet spots”of geological engineering converging in the same layer,poor connectivity of pores and fractures,large burial depth,developed fault systems,and harsh geostress conditions. Based on the geological and engineering parameters of the wells fractured in the block and combined with the theory on shale gas fracture-network fracturing,big data analysis was adopted to develop optimization measures for the fracturing process to meet different geological challenges. These measures included high drilling ratios in the first layer of the first sub-member in the first member of Longmaxi Formation(Long111),great fracturing fluid intensity,short cluster distances,high proppant concentrations,high pump rates,and temporary plugging and diversion. The adaptive analysis of the fracturing parameters in the fractured wells was carried out to verify the feasibility of those measures. On this basis,a template of fracture-network fracturing parameters suitable for the western Chongqing Block was put forward and applied in the field for fracture-network fracturing. As a result,the fracture complexity and stimulated reservoir volume of a single well were increased by 60.59% and 38.3% respectively compared with the earlier three clusters of wells,and the overall production was high. The single-well test productivity grew by 68.67%,and the cumulative production was enhanced significantly,laying a foundation for the efficient development of deep shale gas reservoirs.

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沈骋,范宇,曾波,郭兴午.渝西区块页岩气储层改造优化对策与适应性分析[J].油气地质与采收率,2022,29(2):131~139

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  • 在线发布日期: 2022-06-21
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《油气地质与采收率》
《油气地质与采收率》入选北大《中文核心期刊要目总览》2020年版