煤岩气层损害机理与评价方法

发布时间：2018-06-30 04:56

本文选题：煤层气 + 煤岩　；参考：《钻井液与完井液》2017年04期

【摘要】：目前国内外煤岩气层损害评价尚缺少统一的评价标准与指标。基于煤岩气层特点,分析了煤岩气层损害类型与机理,归纳了国内外分别从煤岩气层解吸性能、扩散性能和渗流性能进行评价的单一环节损害评价方法,分析各评价方法的优缺点及其适用条件。应力敏感、固相侵入与堵塞、聚合物吸附滞留、碱敏、煤粉运移堵塞是煤岩气层主要损害类型;煤岩气层损害既影响煤层排水,也影响煤层气产出,而煤层排水能力也影响煤层气产出;煤层气单一传质过程储层损害评价不全面,亟待建立单一传质过程结合多尺度传质过程的煤岩储层损害评价方法,但渗透能力评价仍然是关键,同时要考虑具有吸附气条件下水相渗流能力的损害评价。
[Abstract]:At present, there is still a lack of unified evaluation criteria and indicators for the damage evaluation of coal and rock gas reservoirs at home and abroad. Based on the characteristics of coal and rock gas reservoir, the damage types and mechanism of coal rock gas reservoir are analyzed, and the single link damage evaluation methods are summarized, which are used to evaluate the desorption performance, diffusion performance and percolation performance of coal and rock gas reservoir at home and abroad respectively. The advantages and disadvantages of each evaluation method and its applicable conditions are analyzed. Stress sensitivity, solid phase invasion and blockage, polymer adsorption and retention, alkali sensitivity, coal powder migration and blockage are the main damage types of coal and rock gas formation, which not only affect coal seam drainage, but also affect coal bed methane production. The coal seam drainage capacity also affects the coal bed methane production, the reservoir damage evaluation of the coal bed methane single mass transfer process is not comprehensive, it is urgent to establish a single mass transfer process combined with multi-scale mass transfer process coal-rock reservoir damage evaluation method. However, the evaluation of permeability is still the key, and the damage evaluation of the seepage ability of water phase with adsorption gas should be considered at the same time.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;中海油能源发展股份有限公司工程技术分公司;
【基金】：国家自然基金面上项目(51674209) 非常规油气层保护四川省青年科技创新研究团队项目(2016TD0016)
【分类号】：TE258

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