摘要：In the process of coalbed methane (CBM) mining, with the decreasing of reservoir pressure, stress sensitivity and matrix desorption shrinkage, which could be called self-regulating effect comprehensively, possess great effect on the gas adsorption due to the changing of pore volume. Therefore, it is necessary to modify the simplified local density (SLD) model to investigate the gas adsorption under reservoir conditions for an accurate prediction of CBM production. For the utilization of SLD adsorption model, assume the pores as slit pore. When pressure is lower than critical desorption pressure and keeps falling, the deformations of specific surface area (SSA) and pore width could be studied by the chosen Shi and Durucan (S&D) model. Furthermore, based on the variation relationship and the modification of SLD model, a new adsorption predicting model could be derived with the consideration of stress sensitivity, and matrix desorption shrinkage. In the absence of stress sensitivity and matrix desorption shrinkage, the calculated consequence is relatively smaller than the actual field adsorption data. What's more, the sensitivity analyses of Poisson's ratio, pore volume compressibility and critical desorption pressure are conducted with the application of this new model. At the same reservoir pressure, Poisson's ratio possesses negative relationship with modified adsorption, while pore volume compressibility and critical desorption pressure both possess positive influence on modified adsorption. The main reason is that Poisson's ratio affects matrix desorption shrinkage negatively, while pore volume compressibility and critical desorption pressure affect matrix desorption shrinkage positively. In spite of the opposite effect of stress sensitivity and matrix desorption shrinkage on pore deformation, matrix desorption shrinkage exhibits a dominant role in self-regulating.

关键字：CBM Adsorption Self-regulating SLD

ISSN号：1866-7511

卷、期、页：卷: 12 期: 18

发表日期：2019-09-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）

发表期刊名称：ARABIAN JOURNAL OF GEOSCIENCES

通讯作者：吴小军,钟子尧,齐荣荣,程志林,黄亮

第一作者：宁正福,韩国庆,王庆

论文类型：会议论文

论文概要：吴小军,宁正福,韩国庆,王庆,钟子尧,齐荣荣,程志林,黄亮，Modified SLD model for coalbed methane adsorption under reservoir conditions，ARABIAN JOURNAL OF GEOSCIENCES，2019，卷: 12 期: 18

论文题目：Modified SLD model for coalbed methane adsorption under reservoir conditions