致密气藏多尺度支撑机理研究与应用

doi:10.11885/j.issn.1674-5086.2022.02.23.01

西南石油大学学报(自然科学版) ›› 2022, Vol. 44 ›› Issue (3): 131-138.DOI: 10.11885/j.issn.1674-5086.2022.02.23.01

• 川西致密砂岩气藏高效开发技术专刊 • 上一篇下一篇

致密气藏多尺度支撑机理研究与应用

陈迟¹, 郭建春¹, 路千里¹, 慈建发²

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500;
2. 中国石化西南油气分公司石油工程技术研究院, 四川德阳 618000

收稿日期:2022-02-23 发布日期:2022-07-13
通讯作者: 陈迟,E-mail:22444210@qq.com
作者简介:陈迟,1980年生,男,汉族,四川内江人,高级实验师,硕士,主要从事油气藏增产改造理论与技术方面的研究工作。E-mail:22444210@qq.com
郭建春,1970年生,男,汉族,四川营山人,教授,博士生导师,主要从事油气藏增产理论与应用技术方面的研究。E-mail:guojianchun@vip.163.com
路千里,1989年生,男,汉族,河北保定人,讲师,博士,主要从事水力压裂裂缝扩展机理、非常规储层缝网扩展理论及数值模拟、水力压裂工程技术方面的研究。E-mail:lu_qianli@foxmail.com
慈建发,1977年生,男,汉族,吉林辉南人,高级工程师,博士,主要从事储层增产改造理论与技术研究与科技管理工作。E-mail:cijianfa.xnyq@sinopec.com
基金资助:
国家自然科学基金（52022087）

Research and Application of Multi-scale Support Mechanism in Tight Gas Reservoir

CHEN Chi¹, GUO Jianchun¹, LU Qianli¹, CI Jianfa²

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Petroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang, Sichuan 618000, China

Received:2022-02-23 Published:2022-07-13

摘要/Abstract

摘要： 致密砂岩气作为重要的非常规天然气资源，需经过压裂改造才能实现有效开发。选取四川盆地致密砂岩露头岩芯，雕刻制作粗糙裂缝面岩板开展多尺度裂缝导流能力和支撑剂回流实验，分析导流能力及支撑剂回流的影响规律。研究表明，为了获得较高且稳定的导流能力，近井主裂缝需要有足够的支撑剂以提供更大的剩余缝宽，远井剪切裂缝只加入少量小粒径支撑剂也能有效改善高闭合应力条件下的导流能力；对于支撑剂充填的主裂缝，裂缝导流能力随着闭合应力和支撑剂浓度的变化存在临界闭合应力及临界支撑剂浓度。在支撑剂充填层中加入纤维，临界出砂流速呈数量级增长，可以有效预防压后裂缝的支撑剂回流。致密气藏多尺度支撑理念在四川盆地川西拗陷致密气储层开展的压裂工程实践取得了显著的增产效果，为中国致密气藏经济高效开发提供了有效支撑和借鉴。

关键词: 致密气, 水力压裂, 多尺度支撑, 粗糙裂缝, 导流能力, 出砂

Abstract: Tight sandstone gas is an important unconventional natural gas resource, which requires fracturing to achieve effective development. In this paper, the tight sandstone outcrop cores in the Sichuan Basin are selected, and the rough fracture rock samples are carved to carry out multi-scale fracture conductivity and proppant backflow experiments, and analyze the influence of conductivity and proppant backflow. The results show that in order to obtain stable conductivity, the main fracture near the well needs to have enough proppant to provide a larger remaining fracture width, and only a small amount of small particle size proppant in the shear fracture of the far well can be effectively improved. For main fractures filled with proppant, the fracture conductivity has the critical closure stress and critical proppant concentration. Adding fibers to the proppant packing layer increases the sanding critical flow velocity by an order of magnitude, which can effectively prevent proppant backflow in fractures after fracturing. The multi-scale support concept of tight gas reservoirs has achieved significant stimulation effects in the fracturing engineering practice of tight gas reservoirs in the west Sichuan Depression of the Sichuan Basin, providing effective support and reference for the economical and efficient development of tight gas reservoirs.

Key words: tight gas, hydraulic fracturing, multi-scale support, rough fractures, conductivity, sand production

中图分类号:

TE343

陈迟, 郭建春, 路千里, 慈建发. 致密气藏多尺度支撑机理研究与应用[J]. 西南石油大学学报(自然科学版), 2022, 44(3): 131-138.

CHEN Chi, GUO Jianchun, LU Qianli, CI Jianfa. Research and Application of Multi-scale Support Mechanism in Tight Gas Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(3): 131-138.

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致密气藏多尺度支撑机理研究与应用

Research and Application of Multi-scale Support Mechanism in Tight Gas Reservoir

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