Establishment Of Seepage Model For Abnormal High Pressure Gas Reservoirs And Research On Productivity Of Horizontal Wells

In today's energy age,people's demand for natural gas is increasing.Conventional natural gas energy has also been extensively exploited over the years.Today,the remaining conventional natural gas reserves and mining speed are no longer up to people's needs.Now the core of natural gas extraction has been transferred to unconventional natural gas.Intense gas,shale gas,and abnormal high pressure gas reservoirs have gradually become the backbone of domestic natural gas in these years.The characteristics of unconventional natural gas reservoirs are mostly due to the low permeability of reservoirs and the low production capacity of gas wells.Conventional mining methods can not meet industrial requirements.Usually,in order to achieve mining goals,they will be developed through hydraulic fracturing.In this paper,After thorough investigation,the capacity of abnormal high pressure and crack containing M gas reservoir is studied.I established a productive capacity model that conforms to the characteristics of the reservoir.of crack,The macroscopic and microscopic aspects are analyzed for the parameter.In terms of macroscopical aspect,I use the equivalent seepage resistance method to establishe the macroscopical production capacity calculation model of fracture strata and make the analysis of the influence factors of fracture properties on production capacity.As to the microscopic level,I define the quasi-pressure of gas-water two-phase seepage and find the solution.At the same time,the production capacity model of abnormal high pressure gas reservoir is established through the principle of conserved angle transformation and superposition of potential.The production capacity model combines artificial cracks and natural cracks,and uses the M-B model to calculate the loss of wellbore along the process pressure and coupling it with the production capacity model to obtain a more accurate production capacity model.This paper end up with analyzing the influencing factors of production capacity.Through the research on the capacity of the gas reservoir about abnormal high pressure,this paper also has a driving effect on the theory in this field,and established the production capacity model has a certain applicability.The methods and ideas in the research process also have some reference value for the study of other types of unconventional natural gas.