考虑水分含量的煤岩渗透率动态变化特征

马飞英,王永清,王林,蒋睿,王慧

doi:10.11764/j.issn.1672-1926.2014.09.1477

天然气地球科学 >

2014 , Vol. 25 >Issue 9: 1477 - 1482

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.09.1477

非常规天然气

考虑水分含量的煤岩渗透率动态变化特征

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1.西南石油大学 “油气藏地质及开发工程”国家重点实验室，四川成都 610500；2.中国石油浙江油田分公司西南采气厂，四川宜宾 645250；
3.中国石油东方地球物理勘探有限责任公司，河北涿州 072751

马飞英(1985-)，女，湖南隆回人，博士研究生，主要从事非常规天然气开发研究. E-mail：xiaomahehe117@sina.com.

收稿日期: 2013-09-17

修回日期: 2013-12-15

网络出版日期: 2014-09-10

基金资助

国家科技重大专项项目“深煤层煤层气增产改造技术研究”(编号：2011ZX05042-002-001)资助.
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The Permeability Dynamic Variation Features of Coalswith the Consideration of Moisture Content

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(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;2.Southwest Gas Production Plant,Zhejiang Oil Field Branch Company,CNPC,Yibin 645250,China;3.BGP INC,China National Petroleum Corporation,Zhuozhou 072751,China)

Received date: 2013-09-17

Revised date: 2013-12-15

Online published: 2014-09-10

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摘要

为探索考虑水分含量的煤岩渗透率模型描述渗透率动态变化特征的准确性以及渗透率在排采过程中的恢复程度，采用考虑水分含量的渗透率模型、P-M模型和S-D模型，研究了该3种渗透率模型的反弹压力p_rb值和恢复压力p_rc值以及渗透率的动态变化过程，研究结果表明：①考虑水分含量的渗透率模型、P-M模型和S-D模型计算的p_rb值和p_rc值中，P-M模型计算的值偏小，S-D模型与考虑水分含量的渗透率模型计算的值比较接近；②3种模型中考虑水分含量的渗透率模型预测的渗透率变化率与现场试井测得的渗透率变化率基本一致，说明考虑水分含量的渗透率模型预测值更接近实际值；③当恢复压力p_rc值小于0时，会出现渗透率降低后在开采过程中无法恢复到初始渗透率的现象。

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关键词： 水分含量; 渗透率模型; 反弹压力; 恢复压力; 动态变化

本文引用格式

马飞英,王永清,王林,蒋睿,王慧 . 考虑水分含量的煤岩渗透率动态变化特征[J]. 天然气地球科学, 2014 , 25(9) : 1477 -1482 . DOI: 10.11764/j.issn.1672-1926.2014.09.1477

Abstract

For the accuracy test of the permeability model considering moisture content to describe the permeability dynamic variation features and the recovery degree of permeability in the drainage process,the values of rebound pressure,recovery pressure of the three kinds of permeability models,and the permeability dynamic variation process were investigated by employing the permeability model considering moisture content,P-M model and S-D model.The results show that:(1) the values of rebound pressure and recovery pressure calculated by P-M model are the smallest,while those values calculated by S-D model and the permeability model considering moisture content are close|(2) the permeability rate predicted from these three models by considering moisture content matches well with the one obtained from site well testing,which indicates the predicted values of the permeability model considering moisture content are much closer to the real values|(3) when the recovery pressure is less than 0,the permeability which decreased in the mining process cannot be restored to the initial permeability.

Key words： Moisture content; Permeability model; Rebound pressure; Recovery pressure; Dynamic changes

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