煤基质膨胀收缩对储层渗透率影响的新数学模型

发布时间：2018-03-21 10:20

本文选题：煤层气　切入点：膨胀收缩　出处：《煤田地质与勘探》2017年01期 　论文类型：期刊论文

【摘要】：煤层渗透率变化受多种因素制约,其中有效应力和煤吸附解吸过程中煤基质的膨胀/收缩是两个主要因素。基于这两方面影响因素,采用体积不变原理和MATCHSTICK模型,提出新的预测渗透率变化的模型,有效回避了经典模型中使用不确定参数引起的渗透率模拟误差问题。研究结果表明,渗透率随煤层压力的变化存在3种理论模型,煤层气排采过程中,应尽可能使得渗透率变化曲线呈现下降缓慢、抬升稳定快速且增幅较大的趋势。最后,通过与经典的Palmer-Mansoori模型和Shi-Durucan模型的模拟对比,并利用现场实测数据进行验证,证明了本文推导模型的正确性和实用性。
[Abstract]:The change of coal permeability is restricted by many factors, among which the effect force and the expansion / shrinkage of coal matrix are two main factors. Based on these two factors, the volume invariant principle and MATCHSTICK model are adopted. A new model for predicting permeability change is proposed, which effectively avoids the problem of permeability simulation error caused by the use of uncertain parameters in the classical model. The results show that there are three theoretical models for the variation of permeability with the pressure of coal seam. In the process of coal bed methane production, the permeability change curve should be decreased slowly, the uplift is stable and fast and the increase is large. Finally, by comparing with the classical Palmer-Mansoori model and Shi-Durucan model, the permeability change curve should be decreased slowly. The correctness and practicability of the model are verified by the field measured data.
【作者单位】：中国石油大学(北京)煤层气研究中心;
【分类号】：TE312

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