Volume 34 Issue 4
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YOU Lijun, LIN Zilan, JIANG An, KANG Yili, CUI Kaixiao. Mechanisms and Evaluation of Coal Gas Bed Damage[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 1-8. doi: 10.3969/j.issn.1001-5620.2017.04.001
Citation: YOU Lijun, LIN Zilan, JIANG An, KANG Yili, CUI Kaixiao. Mechanisms and Evaluation of Coal Gas Bed Damage[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 1-8. doi: 10.3969/j.issn.1001-5620.2017.04.001
shu

Mechanisms and Evaluation of Coal Gas Bed Damage

doi: 10.3969/j.issn.1001-5620.2017.04.001

  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500;

  • 2. CNOOC EnerTech-Drilling & Production Co. Tianjin 300452

  • Received Date: 2017-04-25
  • Publish Date: 2017-07-31
    Abstract
  • Coalbed methane (CBM) has great reserves in the world, and thus has great development potential. Unlike the production of conventional oil and gas, there still have no methods and performance parameters for evaluating damages caused to CBM-bearing formations. In this paper, based on the characteristics of coalbed gas formations, the types and mechanisms of formation damages are analyzed, and single-parameter evaluation methods presently used worldwide are summarized. These methods have been used to evaluate the damages caused to coalbeds with a single parameter, such as the desorptivity, diffusivity and filtration performance, respectively. The advantages and disadvantages, and the applicability of each method are also analyzed. The main damages to coalbed include stress-induced damage, solids invasion into and block of fractures in coalbed, retention of adsorbed polymer molecules, alkalinity-induced damage, and damage caused by migration and block of coal powders etc. Formation damage to coalbed not only affects water drainage, it also affects gas production, and the water draining ability of coalbed also affects gas production. Coalbed damage evaluation with measuring of single-process mass transfer is not an all-round method, and a method combining single-process mass transfer and the multiple-process mass transfer is urgently needed. Nonetheless, the evaluation of the coalbed permeability is the key to a method. Damage to the flow of water in coalbed with gas adsorption is another factor that should be considered in designing the evaluation method.

     

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