Generalized inflow performance model for oil wells of any inclined angle and a computer-implemented method thereof

摘要

An improved inflow performance model that provides the performance of oil wells having any slant angle within the entire azimuth of 0-90 degrees, in saturated and under saturated reservoirs. A generalized model is formulated by normalizing the coefficients of inflow performance relationship (IPR) model by performing a linear regression analysis. The generalized model is further modified to account for skin factor and is also integrated with a straight line IPR to be suitable for determining the performance of under saturated oil wells. For the case of flowing bottom-hole pressures above bubble point pressure, the straight line IPR model is used to determine the flow rate of the oil well, whereas for the case of having bottom-hole pressure below the bubble point pressure, the generalized IPR model is used to determine the flow rate performance of the well.

主权项

1. A method of estimating an inflow performance relationship (IPR) of oil into an oil well located in a reservoir in an oil-producing formation, the method comprising:
standardizing, by performing regression analysis of a first parameter (a0) and a second parameter (a1) with a slant angle of the oil well respectively on a computer processor, wherein the first parameter (a0) is standardized with respect to the slant angle of the well (θ) as a0=−0.000115θ+1.0, and the second parameter (a1) is standardized with respect to the slant angle as a1=−0.003998θ+0.2; standardizing a third parameter (a2) based on the standardized first and second parameters on the computer processor; formulating a first IPR model based on the first, second and third parameter on the computer processor, wherein the first IPR model provides an estimate of a flow rate of the oil well when the reservoir is saturated; modifying the formulated first IPR model to incorporate a skin factor of the reservoir; determining a flow rate of the oil well when the reservoir is under saturated by integrating a second IPR model with the first IPR model; and increasing or decreasing a production rate of the oil well based on the flow rate of the first IPR model and the flow rate of the second IPR model.