Study On Dynamic Analysis And Production System Of Horizontal Gas Wells

Horizontal well has became the main means in gas reservoirs development especially then reservoirs with low permeability in recent years. Compared with vertical wells, horizontal wells has incomparable superiority because of the low filtrational resistance, high productivity of single well and production potential. Therefore, studying reasonable work system and analysis of product system and rate production capacity of horizontal wells has an important significance for holding production performance and efficiently developing gas reservoirs.On the basis of large numbers of literature research, this paper focused on establishing Binomial deliverability equation considering starting pressure gradient in gas reservoirs horizontal wells, analysis the factors affecting the productivity of horizontal well in gas reservoir. Set the target point as nodal point, analyses how the wellhead pressure, formation pressure, skin factor and the inside diameter of the tube affect the product system in nodal analysis. Analyses the relationship between pressure and producing capacity with position though establishing the coupling model of filtering flow in gas reservoirs and conduit flow in horizontal well. This paper also establish critical liquids carrying model to analyses how the liquid carrying works in high gas-liquid ratio and low ratio. On the basis of gas reservoir capacity equation and the production system analysis, determining horizontal wells reasonably working system with thumb rule, mining gas index, nodal analysis and considering the critical liquid carrying flow method. Calculate the single well controlled reserves with the flow of material balance method. Analyses the rate maintenance capability. Preparation of horizontal well production dynamic analysis and study of production distribution system software to provide theoretical support for the horizontal well development.