Design And Demonstration Of Drainage Gas Recovery Scheme For DX18 Volcanic Gas Reservoir

DX18volcano gas reservoir is the main reservoir of Kelameili gas field, which accounts for about30%of the total gas production. Edge-bottom water and high angle fracture are very common in volcano gas reservoir,so premature bottom water coning would affect this type reservoir.When the edge and bottom water get into the reservoir, gas permeability would be greatly reduced. Water invasion of gas reservoir is prone to cause gas well flooding,and emerge a strong water lock effect,affect the development effect of gas reservoir. In order to stabilize the gas field production,extend the stable production period of gas resevior,improve the recovery of gas reservior,the drainage gas recovery of this type reservoir must be researched.In order to make the resonable drainage gas recovery scheme, the following research has been done on this paper:(1)Combined with the geological characteristics of DX18gas well block,dynamic production of DX18gas reservoir was analyzed,the analysis of the dynamic production characteristics of typical gas well and connectivity of gas reservoir,the research on water invasion characteristics of DX18block are included.(2)After established the gas reservoir numerical model,conducted history matching, we had further understanding of the static and dynamic characteristic of the gas reservoir. The gas wells which have strong water invasion basically located in the edge of gas reservior,the more close to the edge,the stronger water invasion, because of the poor connectivity of the reservoir,the remaining reserves of gas resevoirs are mainly distributed in the edge of the reservoir and the area which have poor connectivity.(3)Based on the simulation results of the gas reservoir production history,we designed3kinds of speed scheme and4kinds of drainage scheme.Using numerical simulation technology,we made prediction for speed schemes and drainage schemes respectively.(4)Compared and anlysised the dynamic indicators of different schemes.Select the best scheme of gas recovery by water draining for gas reservior in the aspect of development effect.(5)By utilizing set pair analysis based on combination weights theory to establish economic model of scheme optimization,optimize the scheme of gas recovery by water draining for gas reservior by economic evaluation.For the gas recovery by water draining scheme design and optimization,some people only considered the development effect,mainly predicted the gas reservoir recovery,gas production and other indicators,some people only optimize the development schemes from the economic view.But this paper considered development technical indicator and economic evaluation indicators, optimized the scheme of gas recovery by water draining for DX18,discussed the gas recovery by water draining scheme for the reservoir in a comprehensive sytem and multiple way,making the optimal scheme be more operational in the field.