煤层气地面井压裂排采协同优化技术研究OA

To improve the conversion efficiency from fracturing to extraction in low-permeability CBM reservoirs,This paper focuses on the coordination of the entire fracturing and extraction cycle and conducts joint optimization research on process parameters and extraction systems.In fracturing process,"the active water+1.0%KCl"low damage fracturing fluid(damage ratio 3.2%)and a 1∶4 combination of 16～20 and 20～40 mesh quartz sand proppants are elected to provide permeability and conductivity guarantees for long-term stable production.On this basis,A four-stage dynamic extraction system matched that matches the morphology of fracturing fractures was constructed,and precise control of desorption rate was achieved through three-stage pressure buffering and dynamic adjustment of pump hanging depth,a cyclic well washing process was simultaneously designed to solve the problem of dry grinding of electric submersible screw pumps caused by low water production in later extraction stage.The field application of 50 wells for 16 months shows that the average gas production per well is 261 m3/d,and the daily gas extraction during stable production period exceeds 1.2×104 m3.and the fluctuation of bottomhole pressure is controlled within±0.03 MPa.The research has verified the effectiveness of hydraulic fracturing extraction collaborative technology,which provides a reference technical path for the development of similar low-permeability coalbed methane reservoirs.