Study On Production Performance Simulation Of High Temperature And Pressure Carbonate Gas Reservoir In M

As a key energy strategy deployment in China,carbonate gas reservoirs have great development potential and good development prospects.The pore-slot distribution of carbonate reservoirs in M is complex,the physical properties are different,and the seepage mechanism is complex.In order to study the characteristics of the development of a carbonate gas reservoir in M in high temperature and high pressure,the porosity and permeability of rock samples are measured.Based on the porosity and permeability and micro-CT scanning experiments of rock samples,the samples were classified.Based on different types of rock samples,physical simulation experiments of full-diameter rock sample failure mining were carried out,and carbonate gas reservoirs were fixed.Under the condition of series simulation experiment,the production dynamic characteristics of the target block depletion development were obtained.The main work carried out in the thesis is as follows:.(1)Based on the measurement experiment of porosity and permeability and micro-CT scanning experiment of the rock samples,the pore structure characteristics of the rock samples in the target block were obtained,and the 3D pore model reconstruction was performed on the CT scan result by the maximum sphere method.The pore structure features the rock sample into three types: pore type,hole type and pore-fracture type.(2)The pressure,gas production and recovery degree characteristic curves and ultimate recovery ratio of different types of rock sample failure development were obtained by full-diameter rock sample failure experiment,and the reservoir physical property,depletion speed and water saturation were analyzed.It is found that the rate of deceleration and water saturation have a greater impact on the recovery of the gas reservoirs in the target block,and the effect of deceleration rate is less.There is a positive correlation between the rate of deceleration and the gas production rate of the mine.The type of reservoir has a gas production velocity boundary value,and the boundary values are ranked from large to small: pore-fracture type> hole type> pore type,and the fracture helps to improve the ultimate recovery ratio.(3)Through the series simulation experiment,the pressure curves of different permeability difference combinations under the constant volume conditions of carbonate gas reservoirs and the productivity contribution rates of different regions in different periods of mining are obtained.It is found that the permeability difference determines production contribution rate,depletion rate and water saturation have an impact on failure development.Therefore,it is recommended that the target block be developed at a low speed.At the different stages of development,attention should be paid to the damage of the formation water.At the same time,acid fracturing technology can be considered to improve the recovery ratio of the low-permeability area of the target block.