微波强化煤层气井压裂开采的物性规律

李小刚; 秦杨; 刘紫微; 朱静怡; 杨兆中; 谢诗意; 金心岫; 高晨轩

doi:10.3969/j.issn.1006-6535.2024.03.009

特种油气藏 >

2024 , Vol. 31 >Issue 3: 70 - 77

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.03.009

油藏工程

微波强化煤层气井压裂开采的物性规律

李小刚 ,
秦杨 ,
刘紫微 ,
朱静怡 ,
杨兆中 ,
谢诗意 ,
金心岫 ,
高晨轩

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1.西南石油大学油气藏地质及开发工程全国重点实验室,四川成都 610500;
2.中国石油长庆油田分公司,陕西西安 710018;
3.中国石油塔里木油田分公司,新疆库尔勒 841000;
4.中国石油西南油气田分公司,四川成都 610051;
5.新南威尔士大学,悉尼 1466,澳大利亚

李小刚(1981—),男,教授,2003年毕业于西南石油学院石油工程专业,2009年毕业于西南石油大学油气田开发专业,获博士学位,现从事油气增产改造方面的研究工作。

秦杨(1995—),男,助理工程师,2019年毕业于西南石油大学石油工程专业,2022年毕业于该校油气田开发专业,获硕士学位,现主要从事非常规天然气开发研究工作。

收稿日期: 2023-04-24

修回日期: 2024-03-31

网络出版日期: 2024-07-26

基金资助

国家科技重大专项“多层复杂煤体结构区煤储层直井压裂技术研究”(2016ZX044－004－002);四川省自然科学基金“耐高温自生泡沫压裂液生成规律及其携砂机理研究”(2022NSFSC1036)

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Physical Property Law of Coalbed Methane Well Fracturing Development Enhanced by Microwave

Li Xiaogang ,
Qin Yang ,
Liu Ziwei ,
Zhu Jingyi ,
Yang Zhaozhong ,
Xie Shiyi ,
Jin Xinxiu ,
Gao Chenxuan

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1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, SouthWest Petroleum University, Chengdu, Sichuan, 610500, China;
2. PetroChina Changqing Oilfield Company, Xi′an, Shaanxi, 710018, China;
3. PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China;
4. PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan, 610051, China;
5. The University of New South Wales, Sydney, 1466, Australia

Received date: 2023-04-24

Revised date: 2024-03-31

Online published: 2024-07-26

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摘要

为探究微波加热对煤岩性能的影响,通过室内实验及数值模拟方法对微波作用下煤岩的升温及致裂规律进行研究。研究表明:煤岩含水率对微波加热效果有直接影响,且岩体内温度的升高速度具有各向异性,导致煤岩各部位受热不均,从而产生热应力;微波功率越大,煤岩破碎越严重,微波作用于压裂后的煤岩,可使人工裂缝进一步扩展;压裂液中的添加剂也具有改善煤岩介电性能的功效,滑溜水压裂液增产效果显著,有望代替KCl活性水对煤层进行高效增产技术改造。在施工初期采用水力压裂技术,使压裂液尽可能充填到裂缝深处,可增强煤层介电性能;在施工后期选用微波加热技术,可强化煤层气开采效果。该研究对煤层气的重复压裂工艺具有重要的参考价值。

关键词： 煤层气; 微波加热; 煤岩; 压裂; 热应力; 介电性能

本文引用格式

李小刚 , 秦杨 , 刘紫微 , 朱静怡 , 杨兆中 , 谢诗意 , 金心岫 , 高晨轩 . 微波强化煤层气井压裂开采的物性规律[J]. 特种油气藏, 2024 , 31(3) : 70 -77 . DOI: 10.3969/j.issn.1006-6535.2024.03.009

Abstract

To study the effects of microwave heating on the properties of coal, the temperature rise and cracking laws of coal under microwave action were studied through physical and numerical simulation methods.The research shows that the water cut of coal has a direct impact on the microwave heating effect, and the temperature rise rate inside the coal mass is anisotropy, which leads to the uneven heating of different parts, thereby generating thermal stress.Higher microwave power leads to more severe coal fragmentation.Microwaves applied to the fractured coal can further expand the artificial cracks.The additives in the fracturing fluid can improve the dielectric properties of coal.The production-increasing effect of slickwater fracturing fluid is significant, and it is expected to replace active water (KCl) for efficient production-increasing technology transformation. In the early stage of implementation, hydraulic fracturing technology is used for the fracturing fluid fill into the depth of the fracture as much as possible,which can enhance the dielectric properties of the coal seam. In the later stage,using microwave heating technology can enhance the effectiveness of coalbed methane recovery.This study can provide guidance for the refracturing process of coalbed methane development.

Key words： coalbed methane; microwave heating; coal; fracturing; thermal stress; dielectric properties

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