Analysis Of The Characteristics Of The Water In The Main Gas Reservoir Of Puguang And Research On Water Control Technology

Puguang zhuti Gas reservoir is a large carbonate gas reservoir, for the first time found in domestic. From production began on December 31,2009, a total of 37 Wells production.Since June 2012, five wells at the edge of the geological structure have producted water. The amount of water production is large and water/gas ratio is high. Two wells shut-int. because of high-producted water. Gas reservoir development have been affected by edge water invasion.In order to detect the influence of edge water, research the technique of edge water control and achieve highly efficient development target, therefore to conduct "Research of the edge water invasion control technique in Puguang zhuti Gas reservoir". The main work and achievements are as follows:By studying the gas-water contact relationship and connecting with the effluent water recognition method,get the following conclusion:Puguang zhuti Gas reservoir is mainly for edge water invasion, and has begun to produce edge water that form Fei xianguan Formation; Other geological structure parts of a gas well although not produce water, but if we don't take any measures, according to the original production plan, some gas Wells in 4 to 7 years began to produce edge water;and gas and water interface will be further pushed to the high structure parts.By studying the dynamic data analysis and water saturation test results,get the following conclusion:The results showed that:the main water invasion model of the reservoir is fracture-type; Next, edge water will advance towards areas of P203,P204,P103,P104.According to the experience of similar gas field water conservancy at home and abroad, and in combination with the practical situation of puguang gas field, it put forward the technical strategy of control water on different stages of the puguang gas field. At present, the gas well of edge should be taken with the combination of measures,"lowering gas, plugging water". When the edge water advancing to the middle part, then consider the drainage measures. According to the present condition of water invasion, the implementation of the control size, compressed gas well of edge sealing layer.Measures to restrain the edge water breakthrough, delay the high parts of gas well water breakthrough time, improve the gas reservoir recovery efficiency. Based on dynamic development data about edge water, it evaluated the capacity of edge water, water invasion direction and water invasion type, predicted gas well water time,and fully researched the water invasion characteristics of the gas field. Through the research and analysis of similar gas field at domestic and foreign on geological features, water and water invasion, water control, water control method, it summarized technical countermeasures of water control to the gas field with water,and obtained good effect through implementation.It provide technical support for the puguang gas field development.