钻井液与完井液2017，Vol.34Issue(4)：1-8,8.DOI:10.3969/j.issn.1001-5620.2017.04.001
煤岩气层损害机理与评价方法
Mechanisms and Evaluation of Coal Gas Bed Damage
摘要
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.关键词
煤层气/煤岩/储层损害/机理/吸附/多尺度/综述Key words
Coalbed methane/Coal/Formation damage/Mechanism/Adsorption/Multi-scale/Review分类
能源科技引用本文复制引用
游利军,林子岚,江安,康毅力,崔凯潇..煤岩气层损害机理与评价方法[J].钻井液与完井液,2017,34(4):1-8,8.基金项目
国家自然基金面上项目(51674209)和非常规油气层保护四川省青年科技创新研究团队项目(2016TD0016). （51674209）
