煤层气井高产水对排采产气的影响及预防措施

发布时间：2018-01-14 18:35

本文关键词：煤层气井高产水对排采产气的影响及预防措施　出处：《中国矿业》2017年S1期 　论文类型：期刊论文

【摘要】：L区块位于鄂尔多斯盆地东南缘,目前处于大井组试采评价阶段,有排采井100余口,其中部分煤层气井排采产水量高,造成液面下降困难、修井作业频繁,导致了排采产气效果不理想。本文深入分析了影响煤层产水的主要因素,5#煤层及顶底板含水性弱,产水量低,8~#煤层顶板存在局部高含水灰岩,通过压裂进一步沟通后是形成高产水井的主要原因。在对8~#煤层顶底板含水性识别分析的基础上,采取了差异性的地质选层和压裂工艺等措施。这些认识和措施应用在试采井组生产中,排采实践证实高产水井的数量得到了有效控制,单井平均产水量大幅降低,取到了较好的效果。
[Abstract]:Block L is located in the southeastern margin of Ordos Basin and is currently in the stage of production test and evaluation of large well groups. There are more than 100 drainage wells, some of which have high drainage water production, resulting in difficulty in lowering liquid level and frequent workover operations. In this paper, the main factors affecting water production of coal seams and roof and floor water are weak, and local high water-bearing limestone exists in the roof of coal seam with low water production. Further communication through fracturing is the main reason for the formation of high yield wells. Based on the analysis of water content in roof and floor of No. 8 coal seam. Some measures, such as different geological layer selection and fracturing technology, have been adopted. These measures have been applied in the production of production test well groups, and the production discharge practice has proved that the number of high production wells has been effectively controlled. The average water production of single well has been greatly reduced, and good results have been obtained.
【作者单位】：国土资源部油气战略研究中心;中联煤层气国家工程研究中心有限责任公司;中石油煤层气有限责任公司;
【分类号】：TE377
【正文快照】： L区块构造位于鄂尔多斯盆地东南缘,隶属于渭北隆起和晋西褶曲带,L区块整体呈一向西倾斜的单斜构造,构造稳定,极少有断裂构造存在,总体上构造等高线、局部构造轴向均呈NE30方向展布[1]。本区主要含煤地层为上石炭统太原组和下二叠统山西组,共含煤10层。太原组主要是海湾—泻湖

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