ALRDC Technical Library

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Modification of Vogel’s IPR Curve for Saturated Oil Reservoirs
by: Stacy Caldwell, Scott M. Frailey, James Lea — Added 6/11/2009 12:00:00 AMSWPSC - Art. Lift Computer Sys.


Vogel’s inflow performance relationship relates the flowing well pressure to production rate for solution-gas drive reservoirs. Because two-phase flow exists, the graph of bottom-hole flowing pressures versus oil production rate results in a curved line. This trend accounts for the decrease in production as more gas comes out of the solution.

Vogel assumes the initial reservoir pressure is the same as the bubble point pressure for the starting point of the IPR curve. This implies no gas has initially come out of the solution, i.e. the reservoir is at bubble point pressure. Reservoirs containing a gas cap have an initial reservoir pressure below the bubble point. Traditionally, Vogel’s inflow performance relationship has been applied to these reservoirs using the reservoir pressure as the starting point for the curve. However, due to the presence of gas at the initial reservoir pressure, this is not an accurate assumption. This paper modifies the Vogel IPR curve for use in wel

SCADA System Options for the Oilfeild
by: Alan W. Bryant, George G. Robertson — Added 6/9/2009 12:00:00 AMSWPSC - Art. Lift Computer Sys.


This paper covers basic information on equipment and technology available for implementing Supervisory Control and Data Acquisition systems (SCADA systems) in the oilfield. Topics include RTU’s including electronic flow meters, pump off controllers, PLC’s, human/machine interface (HMI) options, communication protocols (Modbus, Ethernet, others), communication pathways (wireless, cable, fiber optic), and a brief discussion of project considerations such as project economics, project implementation strategies, and system purpose vs. reliability, maintainability, and system integrator services.