Gas Well Pressure And Production Dynamics Analysis In X Shale Gas Reservoir

Research on shale gas extraction has received increasing attention as energy demand.In recent years,development and supporting technologies centered on horizontal wells and hydraulic fracturing have been widely used in the development of shale gas reservoirs.The reservoir of the X Shale Gas Reservoir is low-pore,low-permeability and has low natural production capacity.It is produced by multi-stage fracturing horizontal wells,and the physical properties and transformation effects of the reservoir are unknown.At present,limited mining technologies and complex and difficult mining environments are difficult to achieve efficient development.Therefore,it is necessary to carry out analysis of gas well production dynamics in the study area,evaluate the effects of reservoir fracturing and production capacity,and formulate gas well development plans to increase development benefits and provide reasonable in accordance with.This paper takes the production data of X Shale Gas Reservoir as the research object,based on the theoretical basis of unstable seepage,uses the methods of seepage mechanics,well test analysis,and computer programming to study the dynamic characteristics of shale gas well pressure and production,and analyze the development potential of gas wells.Provide technical basis for development plan.The main tasks are as follows:(1)Applying mass conservation,Darcy's law of seepage,shale gas adsorption analytical law,establishment of horizontal wells and fracturing horizontal wells' unsteady well test models,computer numerical solution method,drawing pressure characteristic curve,and dividing the percolation stage,analysis The influence of parameters such as adsorption coefficient,storage-capacitance ratio,turbulence coefficient,and horizontal well length on the pressure characteristic curve of horizontal wells,and the influence of parameters such as crack spacing and number of fractures on the pressure characteristic curve of horizontal wells in fracturing.(2)Using an unstable(pressure recovery)well test analysis method,using computer software to interpret the well recovery data from wells in X Shale Gas Reservoir,and obtain gas well reservoir property parameters(epidermal coefficient,permeability,pressure,etc.)Shale gas well pressure characteristic curve flow stage,evaluate reservoir fracturing transformation effect,pollution situation.(3)The gas well productivity analysis method of conventional gas reservoir is used to calculate the binomial,exponential and one point productivity calculation for the shale gas well stability test data.The productivity of gas DI1HF well,DI2HF well and W1HF well is 3.56×104m3/d,6.03×104m3/d and 23.56×104m3/d respectively.The results of productivity calculation show that the "one point method" is not suitable for shale gas well productivity calculation.(4)Obtain the dimensionless production solution of shale gas wells by numerical solution method,draw the curve of dimensionless production with timeless production,and analyze the parameters such as adsorption coefficient,number of fractures,fracture spacing,fracture conductivity,etc.influences.Using the production dynamics fitting method,the production history of single well daily gas production volume,accumulated gas production volume,and bottomhole flow pressure of the individual wells in the study area were fitted by computer software,and the physical property parameters of the reservoir that best matched the actual production conditions of gas wells were fitted.The dynamic reserves of wells DI1HF,DI2HF,and WI1HF were determined to be 0.99×108m3,0.54×108m3,and 1.08×108m3,respectively.The remaining dynamic reserves were 0.63 ×108m3,0.36×108m3,and 0.91 × 108m3,respectively.It shows that the gas well has great development potential.