Research On Development Evaluation And Adjustment Plan For Upper Paleozoic Tight Gas Reservoir

Sulige gas field is a typical low-permeability and tight sandstone gas reservoir.,which characterized by poor petrophysical property,high heterogeneity,low reserves controlled by single well and bad conjunction of sandbodies.It's in the early development stage totally of the target block and the producing degree is very low.It's urgent to study on the development evaluation and make proper adjustment plan to ensure that the gas reservoir could be developed efficiently and keep the ability of high production,meanwhile make sure that the geological conditions and development state could satisfy the productivity requirement in long time.On the basis of geology characteristics and gas field development,combined with stochastic modeling and deterministic modeling methods,this paper build the geologic model using static database firstly,then production wells are divided into three types according to the production and petrophysical properties following the dynamic analysis of reservoir,and the decline regular and producing degree of reserves is studied at the same time.Fine reservoir numerical simulation model is established after history matching of production wells using production data,and remaining gas enriched area is sieved to provide suggestion for full potential after the deep analysis of remaining gas and pressure distribution.Based on the binomial equation,this paper makes research of the influence on productivity such as formation coefficient,reservoir heterogeneity and so on,and confirm the development strategies of potentiality tapping measures for each production well.The main measures are divided into four aspects,such as changing single well proration,reperforating on old wells,pressurized addition mining and well pattern infilling.The best adjustment plan is screened out through the adjustment plan designing and comparing and the development prediction is finished.It shows that the remaining gas is concentrate on the layer of H₈X¹?H₈X²?S₁¹ and S₁² where the control of well pattern is poor relatively and pressure wave cannot sweep.The best is the adjustment plan combined with well pattern infilling and pressurization mining.It indicates that the reservoir could keep the high production for ten years,and the cumulative production is 176.7×10⁸m³,oil recovery is 21.38%and the development result is good.