Study On Drainage And Gas Recovery Technology Of Carboniferous Gas Reservoirs In Datianchi Gas Field

Shapingchang structure is located in the Liangping County and Dianjiang County of Chongqing Municipality, formation water has already had a serious impact on the Datianchi gas field Shapingchang blocks of Carboniferous gas reservoir development.Implementation of Dewatering Gas Production become the main development methods for The Gas Reservoir.But The Gas Reservoir has already entered in the later stages of development, and most of the wells has entered a rapid exhaustion stage, only part of the wells can maintain energy sufficient supply. How to choose the best drainage gas recovery measures to make the economic benefits of water gas well is the first problem to be solved.This article demonstrates the process gas reservoir flood control measures on the basis of the analysis and summary of a static and dynamic characteristics as well as development of the water mechanism of the Datianchi Carboniferous Gas Reservoirs. As the existing way of exploitation does not meet the actual needs of the scene,and for the commonly six kinds of Dewatering Gas Production used adaptive process analysis, and established the technical and economic indicators of the system on this basis.The use of "fuzzy consistent matrix method" building Dewatering Gas Production optimization model to provide basis for decision making Dewatering Gas Production preferred process.Through theoretical research and field application, the following results and conclusions are obtained:A main way to The Gas reservoir water influx is water in fracture channeling type and edge water tongue, faults and cracks in the bottom hole is the main channel of water invasion. Long-term high production pressure is the main cause of the gas water. According to the accumulated water vapor ratio of The Gas Reservoir can be divided into low-water vapor ratio well,water vapor ratio well and high-water vapor ratio well, and screened out the need for Dewatering Gas Production is Tiandong 14,29,82,84 and 92 wells.In practical application, as a result of Dewatering Gas Production methods have their own different process for well selection principles, such as groud,underground, geographic specificity of a gas well, while considering their technical and economic requirements. According to the analysis of The Gas Reservoir based data shows that suitable Dewatering Gas Production methods has four kinds:Foam, Gas-lift, Preferably string and ESP.Finally fully considering the economic indicators of various process methods (process cost, investment payback period, the shortest operating period) and the technical index (gas production, water production, lifting efficiency), and using the "fuzzy consistent matrix method" is referred choice, it can be more reasonable the selection of the most suitable process methods to improve economic efficiency.