多翼裂缝垂直井的瞬态压力分析

doi:10.11885/j.issn.1674-5086.2021.04.12.02

西南石油大学学报(自然科学版) ›› 2021, Vol. 43 ›› Issue (5): 137-146.DOI: 10.11885/j.issn.1674-5086.2021.04.12.02

多翼裂缝垂直井的瞬态压力分析

张守江¹, 乔红军², 张永飞¹, 陈一鸣³, 曾凡华⁴

1. 延长油田股份有限公司勘探开发技术研究中心, 陕西延安 716000;
2. 陕西延长石油(集团)有限责任公司研究院, 陕西西安 710065;
3. 辽宁石油化工大学石油天然气工程学院, 辽宁抚顺 113001;
4. 里贾纳大学研究生院, 萨斯喀彻温省里贾纳 SKS4S0A2

收稿日期:2021-04-12 发布日期:2021-11-05
通讯作者: 陈一鸣,E-mail:761276761@qq.com
作者简介:张守江,1966年生,男,汉族,湖北汉川人,高级工程师,主要从事油气田开发方面的研究。E-mail:804906210@qq.com
乔红军,1980年生,男,汉族,陕西周至人,高级工程师,硕士,主要从事油气田开发方面的研究。E-mail:121154800@qq.com
张永飞,1986年生,男,汉族,陕西岐山人,工程师,硕士,主要从事油气田开发方面的研究。E-mail:zhangyongfei09@126.com
陈一鸣,1996年生,男,汉族,辽宁兴城人,硕士,主要从事油气储运等方面的研究工作。E-mail:761276761@qq.com
曾凡华,1977年生,男,汉族,四川营山人,教授,主要从事油气田开发油气试井理论方面的研究。E-mail:fanhua.zeng@uregina.ca
基金资助:
辽宁省教育厅科学研究项目（L2020025）

Transient Pressure Analysis of Vertical Well with Multi-wing Fractures

ZHANG Shoujiang¹, QIAO Hongjun², ZHANG Yongfei¹, CHEN Yiming³, ZENG Fanhua⁴

1. Exploration and Development Technology Research Center, Yanchang Oilfield Co. Ltd., Yan'an, Shaanxi 716000, China;
2. Research Institute of Yanchang Petroleum(Group) Co. Ltd., Xi'an, Shaanxi 710065, China;
3. College of Petroleum Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China;
4. Graduate College, University of Regina, Regina, Saskatchewan SKS4S0A2, Canada

Received:2021-04-12 Published:2021-11-05

摘要/Abstract

摘要： 水力压裂形成的复杂裂缝网络破坏了单个线性裂缝的流动特性，给油井的动态预测带来了极大的挑战。为了研究多翼裂缝垂直井的瞬态压力特征，基于源函数理论和叠加原理将地层系统分为两个子系统，利用离散坐标法建立了瞬态压力分析的半解析模型。通过Laplace变换及Stehfest反演算法绘制了油藏中各流动阶段的识别曲线。在此基础上，通过改变裂缝数量、裂缝长度、裂缝角度、裂缝分布形式和裂缝导流能力等参数对复杂裂缝网络进行了敏感性分析。研究结果表明，多翼裂缝垂直井的地层流动共经历了4个阶段，其中，裂缝数量及长度对地层内地层线性流影响较大；裂缝分布形式对地层内双线性流及地层线性流影响较大且复杂；裂缝导流能力对地层内的双线性流动影响较为明显；裂缝断裂角度对地层内各流动阶段的动态压力特性影响均较小。

关键词: 水力压裂, 多翼裂缝, 垂直井, 瞬态压力分析, 半解析模型

Abstract: The complex fracture network formed by hydraulic fracturing destroys the flow characteristics of a single linear fracture, which brings great challenges to the dynamic prediction of oil wells. In order to study the transient pressure characteristics of vertical wells with multi-wing fractures, the reservoir system is divided into two subsystems based on the source function theory and the superposition principle, and a semi-analytical model of transient pressure analysis is established using the discrete coordinate method. The identification curves of each flow stage in the reservoir are drawn by Laplace transform and Stehfest inversion algorithm. On this basis, the sensitivity analysis of the complex fracture network is carried out by changing the parameters such as the number of fractures, the length of the fracture, the angle of the fracture, the fracture distribution form and the fracture conductivity. The research results show that the reservoir flow in vertical wells with multi-wing fractures has gone through 4 stages. Among them, the number and length of fractures have a greater impact on the linear flow in the reservoir; the distribution of fractures has a large and complicated influence on the bilinear flow in the reservoir and the linear flow in the formation; the fracture conductivity has obvious influence on the bilinear flow in the reservoir; the fracture angle has little effect on the dynamic pressure characteristics of each flow stage in the reservoir.

Key words: hydraulic fracturing, multi-wing fractures, vertical wells, transient pressure analysis, semi-analytical model

中图分类号:

TE357

张守江, 乔红军, 张永飞, 陈一鸣, 曾凡华. 多翼裂缝垂直井的瞬态压力分析[J]. 西南石油大学学报(自然科学版), 2021, 43(5): 137-146.

ZHANG Shoujiang, QIAO Hongjun, ZHANG Yongfei, CHEN Yiming, ZENG Fanhua. Transient Pressure Analysis of Vertical Well with Multi-wing Fractures[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 137-146.

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多翼裂缝垂直井的瞬态压力分析

Transient Pressure Analysis of Vertical Well with Multi-wing Fractures

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