Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (3): 97-101.doi: 10.3969/j.issn.1673-8926.2013.03.017

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Influence of moisture content in coal rock on permeability

MA Feiying1，WANG Yongqing1，WANG Lin2，ZHANG Shuanglong1，ZHANG Qiang3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University，Chengdu 610500， China； 2. Southwest Gas Production Plant， PetroChina Zhejiang Oilfield Company，Yibin 645250， China；3. Guangxi Oil Production Plant， Southwest Oil and Gas Company， Sinopec， Tiandong 531599， China
  • Online:2013-06-01 Published:2013-06-01

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Abstract:

In order to explore the influence of moisture content in coal rock on permeability, this paper made experiments on raw coal samples in a northern coal-bed methane blocks of No. 3 and No. 15 coal bed. The results show that: under the same conditions, the permeability of three kinds of coal rock of dried coal samples, 3% moisture content coal samples and 6% moisture content coal samples first decreases and then increases with the increase of pore pressure, roughly displays “parabola” change. The permeability of dried coal samples is significantly higher than that of moisture content coal samples. With the increase of moisture content, permeability of coal samples decreased. On the basis of experiments and previous studies, using comparative analysis method on experimental data of the coal samples with different moisture content, we modified the Langmuir isothermal equation and set up a permeability model considering the moisture content and coal rock contraction-expansion. Finally, contrastively analyzed the predicted results by model and site well testing permeability data of the application examples, and relative error is small, so this model has certain guiding significance for coal-bed methane mining.

Key words: deep reservoir, tiny amplitude structure, comprehensive evaluation, Kumugeliemu group, western Tahe oilfield

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