关键词: 数值模拟, 溶解气驱油藏, 水平井, 向井流动态关系, 方程

Abstract: At present the Vogel's study methodology, in which an inflow performance relationship (IPR) curve for a solution-gas-drive well is generated at a constant recovery factor, the dimensionless IPR curve can then be obtained, which has been applied to prepare IPRs of solution-gas-drive horizontal wells based on numerical reservoir simulation. The research in this paper discovered that the production processes have a significant influence on performance of a solution-gas-drive reservoir, namely, the average reservoir pressures are not equal when the productions with different flowing bottom-hole pressures reach the same recovery factor. Therefore, there is a drawback in current methodlology of preparing IPR curve based on the numerical simulation calculations. An improved methodology is proposed that the IPR curve of a horizontal well producing from a solution-gas-drive reservoir is firstly prepared at a constant average reservoir pressure, the dimensionless IPR curve is then generated. Based on the new methodology, 3-D flow calculations for a wide variety of solution-gas-drive reservoir models are made. How the concavity of dimensionless IPR curves varies with the decrease in the average reservoir pressure is found. Then a new equation is presented to fit the dimensionless IPR curves of solution-gas-drive horizontal wells.

Key words: numerical simulation, inflow performance relationships, solution-gas-drive reservoir, horizontal well, equation