煤层气井产水影响因素及类型研究——以沁冰盆地柿庄南区块为例

发布时间：2018-07-09 14:41

本文选题：柿庄南 + 煤层气　；参考：《天然气地球科学》2017年05期

【摘要】：为了探讨煤层气井产水的来源,以柿庄南区块为研究对象,重点分析了煤层气井产水影响因素,通过提取典型日产水量与日产气量的指标,分析柿庄南区块X-1井区的产水特征。研究表明:(1)外源水是造成煤层气井高产水的主要原因,含煤岩系中的孔—裂隙系统、断层及压裂缝为水源提供了运移通道;(2)柿庄南区块X-1井区煤层气井典型日产水量与典型日产气量具有明显的负相关关系,排采煤层内源水的煤层气井典型日产水量主要为2~7m~3/d,而排采外源水的煤层气井典型日产水量7m~3/d以上,其中43.8%高产水井典型日产水量大于14m~3/d,难以有效降低煤储层压力,制约煤层气井的产气潜力;(3)基于对煤层气井产水来源和补给通道的分析,提出了构造低幅汇水型、天然裂隙(断层)导通型、自然天窗渗透型、岩溶陷落柱导水型和压裂造缝沟通型等5种产水类型,指明了各种产水类型的识别和预测方法,为煤层气井产水量的预测和高效排采制度的制定提供依据。
[Abstract]:In order to probe into the source of water production of coalbed methane wells, taking Shizhuangnan block as the research object, this paper emphatically analyzes the influencing factors of water production of coal bed gas wells. By extracting the indexes of typical daily water production and daily gas production, the characteristics of water production in X-1 well area of Shizhuangnan block are analyzed. The results show that: (1) exogenous water is the main cause of high yield water in coalbed methane wells. Faults and compressive fractures provide migration channels for water source. (2) typical daily water production of coalbed gas wells in X-1 well area of Shizhuangnan block has a significant negative correlation with typical daily gas production. The typical daily water production of coal bed gas wells is mainly 2 ~ 7 mm / d, while the typical daily water production of coal bed gas wells with external water is above 7m~3/d. The typical daily water production of 43.8% high yield wells is more than 14 m / d, so it is difficult to effectively reduce the pressure of coal reservoir. (3) based on the analysis of the source of water production and the supply channel of coalbed methane wells, the authors put forward the structural low-amplitude water catchment type, natural fracture (fault) conduction type, natural skylight permeation type, etc. Five types of water production, such as water diversion type of karst collapse column and communication type of fracturing and fracture formation, are pointed out, and the identification and prediction methods of various water production types are pointed out, which provide the basis for water production prediction of coalbed gas wells and the formulation of efficient drainage system.
【作者单位】：中海油研究总院新能源研究中心;
【基金】：中国海洋石油总公司科技项目(编号:CNOOC-KY-125ZDXM-00-ZY-01-15) 中国海油科技攻关资助项目(编号:YXKY-2015-ZY-08)联合资助
【分类号】：TE37

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