煤层气静态与流动物质平衡法研究及应用

发布时间：2018-05-29 23:21

本文选题：煤层气 + 物质平衡法　；参考：《石油钻采工艺》2017年03期

【摘要】：煤储层产水气规律不同于常规含水气藏,含气量变化受Langmuir压力及解吸速度的影响,给储层评价带来了难度。通过文献调研发现物质平衡方法在常规油气藏中应用较为广泛,而在非常规储层应用研究较少。在前人的研究基础上根据煤储层流体产出规律,划分煤层气典型生产阶段并建立对应产量预测模型;推导建立静态与流动物质平衡模型,考虑煤储层吸附解吸特征的影响,利用井底流压、累积产量等生产数据确定单井控制储量和储层渗透率。研究结果表明:煤储层孔隙割理自生水量有限,初期高,中后期减弱;煤层物性在生产过程中呈现先下降后上升的特征,受到应力敏感和基质收缩效应的双重影响;静态与流动物质平衡方法均可计算单井动态控制储量,但流动物质平衡方法避免了关井测压对储层产能恢复的伤害,且可得到储层动态渗透率。静态与流动物质平衡方法相比,计算结果较为相近,可为控制储量计算及物性评价提供依据。
[Abstract]:The regularity of water and gas production in coal reservoir is different from that in conventional water-bearing gas reservoir. The change of gas content is affected by Langmuir pressure and desorption speed, which brings difficulties to reservoir evaluation. Through literature investigation, it is found that material balance method is widely used in conventional reservoirs, but less in unconventional reservoirs. On the basis of previous studies, the typical production stages of coal bed methane are divided according to the fluid production law of coal reservoir, and the corresponding production prediction model is established, and the static and flowing material balance model is established, considering the influence of adsorption and desorption characteristics of coal reservoir. The controlled reserves and reservoir permeability of single well are determined by production data such as bottom hole flow pressure and cumulative production. The results show that the pore cleavage in coal reservoir is limited in water volume, high in initial stage and weakened in middle and late stages, and the physical properties of coal seam decrease first and then rise in the process of production, which is affected by both stress sensitivity and matrix shrinkage effect. Both static and flowing material balance methods can calculate the dynamic controlled reserves of single well, but the fluid material balance method can avoid the damage of shut-in pressure measurement to the recovery of reservoir productivity, and the dynamic permeability of reservoir can be obtained. Compared with the method of flowing material balance, the static calculation results are similar, which can provide the basis for the calculation of controlled reserves and the evaluation of physical properties.
【作者单位】：中海油田服务股份有限公司油田生产研究院;
【基金】：中国海油石油总公司“煤层气/页岩气/致密砂岩气三气共采先导性试验研究”(编号:2016ZX05027003-004)
【分类号】：TD84

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