Study On The Mechanism Of Water Damage In Qiongxi Neiqi Reservoir

Xu jiahe2gas reservoir of Qiong xi structure drilling began in1992.This areas is divided into four parts from the analysis of formation characterization and characteristics of reservoir pressure system. Its reservoir with the strong and complex heterogeneity in formation characterization, its also has a complex distribution of reservoir gas-water and the characteristic of water invasion, early production scale of gas reservoir is too large. All these result in fast water channeling occurs in gas reservoir, and it affects producing wells deliverability greatly. Producing wells of north horst fault at present have low production and pressure. Drainage gas recovery which take in south horst fault isn’t ideal. Making a low gas reservoir recovery. Which is very hard to develop subsequent production planning.On the base of the studies and analysis on a great number of related references, this paper analysis on the basic characteristics of fractured quality gas reservoir, and classified to the fractured quality gas reservoir. It thoroughly makes a study of the mode and mechanism of water encroachment of fractured and water-carrying gas reservoir. Due to water influx is the most important parameters of the water encroachment dynamic performance, so I focuses on the various methods of water influx calculation. Working out the water influx of Xu jiahe2gas reservoir of Qiongxi by numerical simulation method. Finally,this parper studied on the water encroachment and characteristics of producing water is analyzed on Xu jiahe2.Working out that south horst fault is fracture gas reservoir with bottom water and north horst fault is fracture gas reservoir with edge water. Through analysis of water influx channels and water influx direction for the gas reservoir. It basically determined the way water store in reservoir and mechanism of water cutting. The research work in this paper has a certain significance for reasonable with following efficient development.