Study On Development Status Of PG Main Gas Reservoir And Technical Countermeasures For Stable Production

With the increasingly high inverse proportion of natural gas in the global energy system, gas reservoirs with high content of H2S development is becoming more and moreimportant, and the resources of Sichuan basin gas reservoirs with high content of H2S is alsoabundant, Sichuan basin proved natural gas reserviors with high content of H2S have accumulated more than6300x108m3,accounting for about1/6of proved nature gas reserves.However,the technology of gas reservoirs with high content of H2S development is not mature in our country,high sulfur carbonate gas reservoirs in the PG gas field as the representative of the high content of H2S.the plane and vertical distribution is uneven,the vertical reservoir complex,reservoir heterogeneity is strong,reservoir type is fracture-pore(pores. cracks, holes),reservoir space is complex.phase is complex and also exist phase transition,a part of production wells in the above of the water, affected by water influx seriously.therefore the dynamic production rules are difficulty to assessment,in order to efficiently develop, provide technical support and reference for the development of PG the main gas reservoirs, need to do further research on gas well productivity evaluation method.Gasreservoirs pressure diversification is an important foundation for gas reservoir engineering calculation.start with the calculation of gas reservoir pressure, use M-B method to calculate the bottom hole flowing pressure of PG gas field,use well production data, well as the formation inspect pressure was calculated with material balance method.From the point of view of sulfur solubility model,using the measured data fitting model of Chrastil empirical formula and the phase equilibrium solubility calculation is suitable for PG gas reservoir gas solubility prediction formula, and establishes the calculation formula of sulfur saturation.Use of dynamic production data, evaluaterating produced water of the PG gas field, and the influence of water invasion of gas well flow potential,and have established the evaluation method of PG gas field production:single point test course, improve single point test course, binomial expression deliverability equation? Material balance and flow potential combination method.Considering the effect of sulfur deposition on gas well productivity of the material balance and flow potential combination method,this method is a dynamic process of off take potential calculation,considering the effect of sulfur deposition on the permeability was calculated based on the umiand of sulfur deposition on gas well productivity.By using the deliverabibility calculation course run off take potential evaluateof PG of the main37gas producers,by comparing results obtained the most suitable method for the production of PG gas field.At the same time the use the gas production history method,nodal analysis method,thumb rule method bring into production proration,Application reservoir influence function method, flowing material balance method, gas production history method calculate evaluation of the gas reservoir dynamic state of single well.In view of the existing gas reservoir in the production process, through the control water gas production, blank off water yield formation, acid broken down several angles put forward rate maintenance capability tech cure,and discussed years of stable production and the optimization scheme is evaluated.