樊庄地区3^#和15^#煤层合层排采的可行性研究

Feasibility of Multi-layer Drainage for No 3 and No 15 Coal Seams in the Fanzhuang Area

煤层群发育的地区实施分层压裂、合层排采工艺技术是降低煤层气勘探开发成本、提高产气量的重要举措之一。准确掌握此项技术的适用条件是提高其成功率的重要保障。根据煤层气井垂直井产气特点,系统分析了樊庄区块3#煤层和15#煤层合层排采的主要影响因素;根据樊庄地区勘探开发资料,得出该区上下围岩性质、煤储层物性特征及水力压裂后渗透率;根据地下水动力学原理及勘探资料,绘制出该区3#煤层和15#煤层地下水流势图;根据煤层气井排采特点,结合达西定律,最终得出研究区3#煤层和15#煤层适合合层排采的区域。现场部分井的开发试验验证了理论分析的可靠性。

The implement of separate layer fracturing and multiple layer drainage for coalbed methane in the multiple coal seams is an important method to reduce the costs of exploration and development, and to increase the gas production. It is important for the skillful know of the adaptive conditions to increase successful ratio. According to gas-producing characteristics of combed methane vertical wells, the main factors constrained multi-layer drainage in No 3 and 15 coal beds in the Fanzhuang area were discussed. The characteristics such as surrounding rock, physical property of coal reservoir and permeability after hydraulic fracture were gained from the exploration and development data in the study area. According to file of exploration and development and groundwater dynamic, the pattern of force and velocity of a current groundwater in No 3 and 15 coal bed areas were gotten. By Darcy＇s law and drainage for coal bed methane wells, the adaptive regions for multi-layer drainage of coal bed methane were chosen. The early production system tested the dependability of theoretical analysis.