川南泸州区块深层页岩气井压裂参数优化  

Optimization of fracturing parameters for deep shale gas wells in Luzhou block,southern Sichuan Basin

作　　者：姚志广 邵莎睿 黄永智 杜雨柔 董研 徐颖洁 YAO Zhiguang;SHAO Sharui;HUANG Yongzhi;DU Yurou;DONG Yan;XU Yingjie(Shale Gas Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan Province,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油西南油气田公司页岩气研究院,四川成都610051 [2]页岩气评价与开采四川省重点实验室,四川成都610051

出　　处：《天然气勘探与开发》2025年第2期92-102,共11页Natural Gas Exploration and Development

基　　金：中国石油西南油气田公司科研项目(编号:20230302-12)。

摘　　要：为了解决现有压裂技术在四川盆地南部泸州区块(天然裂缝发育异常、地质—工程条件复杂)深层页岩气开发中适应性欠佳的问题,建立储层三维模型,以井控储量充分动用为目标,分析压裂缝网几何形态参数需求,并在精细划分天然裂缝模式的基础上,构建基质模型与天然裂缝模型,进而利用水力压裂数值模拟技术,对分段簇数、施工排量、用液强度等关键压裂参数进行优化。研究结果表明:①将泸州区块天然裂缝划分为网状缝、单向缝(单向缝进一步分为大角度缝、小角度缝、平行近距离缝、平行远距离缝)等两大类型共计5种模式,通过数值模拟优化压裂参数,形成了针对两大类型天然裂缝模式的压裂参数优化结果;②推广应用优化成果,现场试验井在压裂施工期间未发生井下复杂情况,压裂后该井EUR(Estimated Ultimate Recovery,最终可采储量,作变量时写作EUR)高于井区平均水平,应用取得成功。结论认为,所形成的针对不同天然裂缝模式的压裂参数优化结果,有效指导了泸州区块深层页岩气井的压裂设计方案优化,为研究区及类似区块的深层页岩气开发提供了压裂参数设计方面的技术保障。The existing fracturing technologies are not very adaptable to the deep shale gas development in the Luzhou block of southern Sichuan Basin,where the development of natural fractures is abnormal and the geological-engineering conditions are complex.To solve this problem,a 3D reservoir model was established to analyze the requirements for the geometric parameters of hydraulic fracture network with the goal of fully producing well-controlled reserves.Then,matrix model and natural fracture model were constructed based on the fine division of natural fracture patterns.Finally,the key fracturing parameters such as cluster number per stage,flow rate,and fracturing fluid intensity were optimized by using the hydraulic fracturing numerical simulation technology.The results show that the natural fractures in the Luzhou block are divided into two types(network fracture and unidirectional fracture),and the latter is subdivided into four patterns(high-angle fracture,low-angle fracture,parallel proximal fracture,and parallel distal fracture).The fracturing parameters for the two fracture types are optimized by using the numerical simulation.The results have been successfully applied to the test well on site,indicating that no downhole complexity occurred during the fracturing operation,and the estimated ultimate recovery(EUR)after fracturing is higher than the average of the well area.It is concluded that the optimized fracturing parameters for different natural fracture types effectively guide the optimization of fracturing plan for deep shale gas wells in the Luzhou block,and provide technical guarantee of fracturing parameter design for the development of deep shale gas in the study area and similar blocks.

关 键 词：四川盆地南部 泸州区块 深层页岩气 压裂模拟 压裂缝网 参数优化 矿场应用 

分 类 号：TE377[石油与天然气工程—油气田开发工程]