Influencing Factors and Engineering Parameter Optimization of Fractured Horizontal Well Productivity in Tight Gas Reservoir

Tight sandstone gas reservoirs are important strategic replacement resources in China and are the main type of unconventional natural gas reservoirs. Horizontal well multi-stage fracturing technology is an effective technical means for unconventional tight gas reservoirs to achieve industrial development value. For fractured horizontal wells, the production capacity factors mainly include geological and engineering factors. The effective thickness of gas layers, permeability, water saturation, permeability, and formation pressure are the basic factors that affect the gas well. The length of horizontal sections, the number of fractured sections, and the half length of fractures are controllable factors that affect the production capacity of horizontal wells. SDN Block of Sulige Gas Field is the largest demonstration area of horizontal wells in tight sandstone gas reservoirs in China. The number of wells put into production of horizontal wells accounts for about 40% of the total number of wells put into production in the block, and the annual output of horizontal wells accounts for more than 75% of the total annual output of the block. The development of horizontal wells is particularly critical to the long-term stable production of SDN Block. This paper combines block geological research, engineering parameters and means of production of gas wells, and uses numerical simulation technology, Quantitative analysis of the sensitivity of various influencing factors on the production capacity of horizontal wells, proposing the main controllable factors that affect the production capacity of horizontal wells, and combining economic evaluation, optimizing the engineering parameters of horizontal wells in this block to improve the overall development effect of tight gas reservoirs in the block.