Study On Water Intake Mechanism And Water Control Measures Of Carboniferous Gas Reservoir In Shuangjiaba Block

The most gas reservoirs of Chuandong Carboniferous gas reservoirs are producing formation water with gas currently. The intensity of water invasion in Chuandong Carboniferous gas reservoirs is not very strong, but it impacted the production seriously. As these gas reservoirs comprehensively developed in a quick way, formation water influence is a big issue to normal production. It’s urgently required to research the characteristics of edge water distribution, water-yielding rule, influence to production and proper methods for water control.Some water control methods had been practiced in Shuangjiaba gas reservoir while starting to produce formation water, but it didn’t work well and restricted the gas production in the late phase. So, this paper takes the Shuangjiaba Carboniferous gas reservoir as the research object, deeply analysising the static geological foundation, dynamic characteristics of gas reservoir development,feature of water flow, mechanism of water invasion, water control experiences and to figure out some effective ways for water control for late development of Shuangjiaba Carboniferous gas reservoirs. Through this article research the following understanding are mainly obtained:(1)The gas reservoirs overall have good communication with the internal relations, and the Shuang①and②no. fault between the upper and lower plate are connected.(2) The invasion is along the southwest and northeast of the two ends. On the ways of water intrusion, QiLi7well is strong tongue water intrusion, QiLi9well and QiLi43well are weak tongue water intrusion after conducting of the fault, QiLi17well may be affected simultaneously by the weak tongue water intrusion after conducting of the fault and the tongue edge water intrusion in the northern tip.(3)The cumulative water influx of gas reservoir is about6000000cubic meters which calculated using curve fitting method, apparent geological reserve method and non-steady water invasion method.(4) Through the calculation using the curve fitting method, waterflood curve method and modern chart fitting method,we think that the Shuangjiaba Carboniferous gas reservoir is inactive water intrusion gas reservoir,and the activity level of water body is waning in the late.(5) At present, the three effluent wells have a greater dynamic reserves remaining.(6)The reasonable water control way of the Shuangjiaba Carboniferous gas reservoir is: implement drainage gas recovery in both the north and south ends of the reserves-rich region.