Production Capacity Evaluation Of Fracturing Horizontal Wells In Tight Sandstone Water Production Gas Reservoirs

Tight sandstone reservoirs are low-permeability and water-bearing,and gas-water two-phase flow needs to be considered when studying gas well productivity.Hydraulic fracturing is a commonly used stimulation measure for tight reservoirs.Evaluation of the productivity of horizontal wells after fracturing can better guide development.In this paper,based on the gas-water two-phase seepage,considering the impact of stress sensitivity and slippage effect on the productivity of horizontal wells,a tight sandstone water-producing gas reservoir fracturing horizontal well productivity model is established and applied for analysis.First,fully investigate the previous research on the productivity of conventional and water-producing gas reservoir fracturing horizontal wells.Based on the profile of the Linxing block,the production dynamic analysis of the water-producing horizontal wells was carried out through the interpretation of production well testing and the law of decreasing production capacity;then different methods were used.Calculate the dynamic reserves of water-producing gas wells;select the horizontal well productivity formula and establish a suitable fracturing horizontal well physical model,list the gas-water two-phase flow differential equations,and then use the quasi-steady state method to convert the three-dimensional flow field of the horizontal well into two Two-dimensional seepage field,and the permeability formula considering the effects of stress sensitivity,gas slippage and high-speed non-Darcy flow is substituted into the seepage equation of the fracturing horizontal well,the gas-water two-phase generalized pseudo-pressure is defined,and the water producing gas reservoir fracturing horizontal well is established The productivity model,combined with the actual data,is used to calculate the generalized pseudo-pressure of the gas-water two-phase through the permeability curve,and the unobstructed flow of the gas well with different calculation methods is obtained and the accuracy comparison is made.Finally,based on the above research,the parameters of the fracturing horizontal well are optimized and develop countermeasures.The gas-water production fracturing horizontal well productivity model established in this paper has certain guiding significance for evaluating the productivity of fractured horizontal wells in tight sandstone water-producing gas reservoirs and rationally developing tight sandstone water-producing gas reservoirs.