CEALC Products -- System Analysis for Rod Pumping Program (SARP)

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System Analysis for Rod Pumping Program (SARP)

Multi-phase flow correlation
Mechanistic models
Extensive pump databse
Reservoir inflow perfrmance
Steel, fiberglass or combination rod string

Total system analysis
API and emprical design methods
Rod string optimization
Dynomemeter cards
Block oil fluid property

Program Overview

The SARP program is designed to perform a sensitivity analysis on any of the sucker rod pumping system components. The existing system can thus be optimized, or a new one can be designed. The SARP program generates plots of the final analysis so that fluid production and power consumption can be predicted. In addition, the SARP program predicts the effect produced by a change in any component of the pumping system. The following sensitivity variables are included:

Pumping unit type (Conventional, Air Balanced, Mark II and Torquemaster)
Polished rod stroke length
Rod taper and grade (steel rods, fiberglass rods and sinker bars)
Plunger size
Gas anchor (poor boy, cup, packer and natural type)
Reservoir performance including Vogel and Constant Pl
Anchored or unanchored tubing.

Program Options

The SARP program has two main options. The first enables the user to predict the possible flow rate for a given set of conditions. For example, for a given pumping unit, rod taper and grade, pump length, plunger size, gas anchor type, reservoir IPR, stroke length and pumping speed, SARP predicts the possible flow rate.

The second option enables the user to determine the maximum possible flow rate, considering all components of the rod pumping system in addition to the reservoir performance. The SARP program starts by assuming a bottomhole flowing pressure and then calculates the maximum allowable speed that will be operationally safe. The pumping unit type, rods grade, and allowable downward rod velocity are the criteria used to determine operational safety. The assumed bottomhole flowing pressures range from 100 psig up to the average reservoir pressure. Once the maximum allowable speed has been calculated, pump displacement and the production are calculated. The calculated flow rates are plotted as the outflow curve on the final graph against the assumed bottomhole pressures. At the intersection of the outflow and the inflow (IPR) performance curves, the possible flow rate can be predicted. Please note that in some cases, two intersections will be predicted. The program will pick the one that is occurring at a higher pressure as the possible flow rate.

In the event that a gas anchor is used, the outflow curve will exhibit a kick at the lower intake pressure. If the intersection with the inflow performance curve is below the kick, then a gas anchor is recommended. In all other cases, a gas anchor is not recommended.

In order to better understand the use of a gas anchor and the effect of the pump setting depth on the possible flow rate and power consumption, the user should read the article on "System Analysis for Sucker Rod Pumping," SPE Prod. Engr. (May 1989) 125-129 by Z. Schmidt and D. R. Doty.

Hardware Requirements

The program is written to run on an IBM compatible pc, with the following configuration and software:

Windows (32-bit Version): MICROSOFT Windows95 or Windows NT

486 Processor Minimum

RAM - 8 MB

2-key Mouse

HARD DISK REQUIREMENT: 10 MB free

PRINTER: any windows printer

DOS version: Single user application on a PC-compatible equipped with a math co-processor.

HARD DISK REQUIREMENT: 10 MB free

DISPLAY: monochrome or color monitor equipped with EGA or VGA graphic adapter

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