Study On Pressure And Capacity Calculation Of Wellbore With Horizontal Horizontal Well

Subjected on water-gas two-phase flow of water-drive horizontal gas well, following achievements on the productivity formulation and wellbore pressure drop are quired by using percolation mechanics, fluid mechanics, and mathematical methods.(1) Summary of plow pattern, pattern transition criterion and the identification process are studied in vertical section, horizontal section, inclined section respectively.(2) Pressure drop models are developed and programed in different sections respectively. After the theory work, actual gas-field producing datas are used, and influence factors such as productivity, water-gas ratio, and tubing diameter were analyzed. The most important of all is, by importing well deviation data into the computer program, the pressure drop calculation in this paper is more precise than previous methods. This program is not only easy to operat, but also universal high.(3) Base on research a and summary of classic deliverability of horizontal gas-wells and Oil-wells, a way of calculating the deliverability of water-dive horizontal gas-well is established, and the affecting factors of which are studied. The advantage of this method is that it can be more efficient and more universal high.(4) Coupling model of percolation in formation and variable mass flow in horizontal well is established by the law of conservation of mass, and the solution of which is realized by using computer programming. Affecting factors such as reservoir pressure, drainage radius, and water-gas ratio are studied.(5) By importing well deviation data into the computer program, Coupling model with pressure drop of gravity considered is derived and programed. Due to the irregularity of well deviation, the result of this Coupling model is also irregular. However, a new perspective is presented by this study, which makes it a meaningful trial.