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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。
In order to investigate the source of water produced by coalbed methane wells, the paper focuses on the factors affecting water production in coalbed methane wells by taking Shizhuangnan block as an example. By analyzing the indexes of typical daily water production and daily gas production, District water production characteristics. The results show that: (1) Exogenous water is the main reason for high production of water in coalbed methane wells; pore-fissure systems in coal-bearing rock series and faults and fractures provide a migration channel for water sources; (2) The typical daily production of CBM wells in X-1 well area is obviously negatively correlated with the typical daily gas production. The typical daily production of CBM wells with the source water of coal seams is mainly 2 ~ 7m ~ 3 / d, Of typical daily output of coalbed methane wells is more than 7m 3 / d, of which 43.8% of high-yield wells have a typical daily production of more than 14m 3 / d, which makes it hard to effectively reduce the pressure of coal reservoirs and restrict the gas production potential of CBM wells. (3) Gas source water production and supply channel analysis, put forward the construction of low amplitude catchment type, natural fracture (fault) conduction type, natural skylight infiltration, karst collapse column conductivity and fracturing sew communication type 5 kinds of production Water types, indicating the identification and prediction methods of various water production types, and providing the basis for the prediction of water production in coalbed methane wells and the formulation of an efficient drainage system.