基于煤层气井排采数据的储层含气量动态反演研究

马东民; 伋雨松; 陈跃; 郑超; 滕金祥; 马卓远; 肖嘉隆

doi:10.3969/j.issn.1001-1986.2021.06.007

基于煤层气井排采数据的储层含气量动态反演研究

doi: 10.3969/j.issn.1001-1986.2021.06.007

马东民^{1, 2,},
伋雨松¹,
陈跃¹,
郑超¹,
滕金祥¹,
马卓远¹,
肖嘉隆¹

基金项目:

国家自然科学基金项目 41902175

山西省科技重大专项项目 20201101002

自然资源部煤炭资源勘查与综合利用重点实验室开放课题 KF2019-2

详细信息

第一作者:
马东民，1967年生，男，陕西合阳人，博士(后)，教授，从事煤与煤层气地质教学与研究工作. E-mail：mdm6757@126.com

中图分类号: P624.7
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-25
- 修回日期: 2021-11-05
- 发布日期: 2021-12-25
- 网络出版日期: 2021-12-30

CBM well drainage data-based dynamic inversion study of reservoir gas content

摘要

摘要: 煤储层含气量是煤层气开发的核心参数，但实测煤储层含气量与煤储层的真实含气量之间往往存在误差。基于窑街矿区海石湾井田煤层气井不同时段的产气量，以煤储层含气量“定体积”降低为基础，反演煤储层实时含气量，研究煤层气井排采过程煤储层实时含气量的变化规律。结果表明：煤储层含气量随排采时间呈线性下降趋势，不同步长煤层气井产气量与煤储层含气量降低幅度一致，遵循“定体积”产气特征，即煤层气单井产气量是煤基质“定体积”产出；煤层气井的产气量与含气量降低速率有关，而与煤储层原始含气量无关。煤储层为隔水层，水力压裂难以改变煤基微孔隙通道的结合水状态，CH₄产出过程受水–煤界面作用控制，煤层气产出是“CH₄·煤·水”三相界面传质作用的结果，水–煤界面作用中水的湍动提供并传递能量，激励块煤中CH₄解吸与产出。
- 窑街矿区 /
- 海石湾煤矿 /
- 煤层气 /
- 定体积 /
- 排采数据反演
Abstract: The gas content of coal reservoir is the core parameter of coalbed methane production. There is an error between the measured gas content and the real gas content of coal reservoir. In this paper, based on the gas production of Haishiwan coalbed methane wells in different periods and the decrease of the "constant volume" of the gas content of coal reservoirs, the real-time gas content of coal reservoirs is inverted, and the change rule of the real-time gas content in the process of coalbed methane well drainage is explored. The results show that: (1) The gas content of coal reservoir decreases linearly with the drainage time t. the gas production of different long coalbed methane wells is consistent with the decrease of coal reservoir gas content, and follows the characteristics of "constant volume" gas production, that is, the gas production of single coalbed methane well is the "constant volume" production of coal matrix; (2) The gas production of coalbed methane wells has nothing to do with the original gas content of coal reservoir, but is related to the reduction of gas content; (3) The coal reservoir is a water-resistant layer, and hydraulic fracturing is difficult to change the combined water state of coal-based micropore channels. The CH₄ production process is controlled by the water-coal interface. Coalbed methane production is the result of mass transfer at the three-phase interface of "CH₄, coal and water", in which water turbulence provides and transfers energy to stimulate the desorption and production of CH₄ in block coal.
- Yaojie mining area /
- Haishiwan Coal Mine /
- coalbed methane /
- constant volume /
- dynamic inversion of drainage data

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图 1 窑街矿区地理位置^[22]

Fig. 1 Geographic location of Yaojie mining area^[22]

下载: 全尺寸图片幻灯片

图 2 海石湾HSW05煤层气井群排采曲线

Fig. 2 Coalbed methane drainage and production curves of well group HSW05 in Haishiwan

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图 3 不同原始含气量步长为1 d实时煤储层含气量变化曲线

Fig. 3 Real-time gas content change in different original gas contents in 1 d step size

下载: 全尺寸图片幻灯片

图 4 不同原始含气量不同步长实时含气量变化曲线

Fig. 4 Real-time gas content change in different original gas content in different step size

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表 1 HSW05不同煤层气井煤二层参数

Table 1 Parameters of the second coal seam in different wells of well group HSW05

井号	煤厚/m	压裂缝长设计/m	视密度ρ/(t·m^–3)	产气煤体积V/m³
HSW05-1D	3.50	120	1.4	158 256
HSW05-2D	1.25			56 520
HSW05-3V	17.20			777 715
HSW05-4D	9.30			420 509
HSW05-5D	22.10			999 274

下载: 导出CSV

表 2 HSW05井群不同排采阶段曲线斜率

Table 2 Straight slope of HSW05 wells in different drainage stages

井号	上升阶段	下降阶段
HSW05-1D	–0.001 8	–0.003 2
HSW05-2D	–0.011 6	–0.013 0
HSW05-3V	–0.000 1(缓慢)	–0.001 6
HSW05-3V	–0.001 2(快速)	–0.001 6
HSW05-4D	–0.000 7	–0.001 9
HSW05-5D	–0.000 5(缓慢)	–0.001 2
HSW05-5D	–0.001 0(快速)	–0.001 2

下载: 导出CSV

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