樊庄区块煤层气开发地质类型与开发技术模式

Exploitation Geology Types and Development Technology Modes of Coalbed Methane in Fanzhuang Block

针对樊庄区块3号煤层划分为4类地下水补给类型以及6类开发地质类型情况,提出并探讨了该区块煤层气开发技术模式。研究认为,供给型难解吸储层有越流补给,且渗透率较高,适合大间距井网、小规模压裂和高抽油机冲次;补给型难解吸储层地下水流体势较低,可采用大间距井网、大规模压裂和高抽油机冲次;半封闭型难解吸储层补给水量较小且持续性好,适合于小规模压裂、高抽油机冲次;半封闭型易解吸储层补给水量较小且持续性差,可采用大规模压裂和高抽油机冲次;封闭型易解吸储层地下水流体势较高,适用于大规模压裂和低抽油机冲次;封闭型难解吸储层渗透率过低,可采用大规模压裂、小间距井网、低抽油机冲次。

The No.3 coal seam of Fanzhuang block was divided into four types of groundwater replenishment and six exploitation geology types.Then corresponding development modes of No.3 coalbed reservoir in Fanzhuang Block were put forward. The results showed that the non-desorbing reservoir with supply type hydrodynamic conditions of groundwater had leakage recharge and high permeability. It was fitted for large space well pattern, small-scale fracture and high production system. The non-desorbing reservoir with replenishment type hydrodynamic conditions of groundwater had low ground water fluid potential and was fitted for large space well pattern, large-scale fracture and high production system. The non-desorbing reservoir with semi-open hydrodynamic conditions of groundwater had small but persistent supplemental water and was fitted for small-scale fracture and high production system. The desorbing reservoir with semi-open hydrodynamic conditions of groundwater had small and poor supplemental water. It was fitted for large-scale fracture and high production system. The desorbing reservoir with enclosed type hydrodynamic conditions of groundwater had high ground water fluid potential and fitted for large-scale fracture and low production system. The non-desorbing reservoir with enclosed type hydrodynamic conditions of groundwater had lowest permeability and was fitted for large-scale fracture, small space well pattern and low production system.