ALRDC Technical Library

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A NEW ROBUST MODEL FOR NATURAL SEPARATION EFFICIENCY
by: Richard Marquez, Mauricio Prado — Added 6/11/2009 12:00:00 AMSWPSC - General


Performance of any artificial lift pumping system is significantly affected when free gas enters the pump. Quantifying the natural separation efficiency will help to minimize this effect. In the last few years, the University of Tulsa Artificial Lift Projects (TUALP) experimental facilities were used to obtain important experimental data on natural separation. This data has allowed the development of simplified models such as Alhanati (1993) and Serrano (1999). Even though previous models have been able to provide an estimate for natural separation efficiency, both models never considered the effect of important variables as the slip velocity in the radial direction and the geometric characteristic of the bottomhole completion. This paper presents a new model and a new correlation obtained from TUALP experimental data. This work is different than previous simplified models since it considers the drag effect in the radial direction. This new model represents a simple and reliable tool,

ESP Gas Separators Development and Testing
by: B. L. Wilson, — Added 9/20/2009 12:00:00 AMSWPSC - General


This paper reports on the testing and development of a new generation of gas separation technology for Electrical Submersible Pumps.

Active (rotary) gas separators were introduced to the market 20-25 years ago, and no major improvements have been made since Accurate testing of gas separators has always been fraught with problems, sometimes producing confusing and misleading information. An in-depth study and testing of the separators in a high pressure gas testing loop has indicated some methods to improve the gas separator performance.

Finite element modeling, coupled with advanced CAD/CAM and fabrication techniques, has aided in a developing a new separator. This separator has improved both the efficiency and operating range.

The information conveyed in this presentation will give the users of ESP insight into how the gas separation equipment is developed and tested and will also increase their understanding of the cost and effectiveness that can be expected in the applic

High Volume Technology for Low Volume Applications
by: Malcolm Rainwater, Randy Herring — Added 9/20/2009 12:00:00 AMSWPSC - General


Historically, Electric Submersible Pumps were designed and manufactured for large volume applications producing from moderate depths. Low volume production (less than 400 bpd) was considered rod pump territory. Unfortunately, due to depth limitations inherent to sucker rods, rod pumping low production wells at deeper depths often becomes uneconomic due to high failure rates. Utilizing new control technology, the advent of wider vane designs, and high pressure housings, low volume ESP’s have proven successful in replacing conventional and non-conventional pumping units in today’s oil industry.

Keeping ESPs Primed in High Volume Gas Wells
by: John Mack, Greg Robl — Added 6/12/2009 12:00:00 AMSWPSC - General


Wells used for gas production can present many problems for ESP systems. Extended duration gas slugs can cause pumps to lose prime and cycle on and off.

This paper deals with one lease holder’s attempts to produce gas with an ESP system in place. New Dominion has wells with gas slugs lasting one to three minutes and longer. Working with a manufacturer, a solution was developed that (when properly sized) can balance the well and allow production of gas without constant system shutdowns.

This paper examines two case histories involving inverted shrouds as long as 450’. While producing as little as 900BWPD, output rose to 600MCFD of gas before leveling off at 400MCFD.

This information will be beneficial to anyone wishing to use ESPs who is having problems with gas slugs in vertical or horizontal applications.

Production Enhancement and Cost Reduction Opportunities as Identified by Electrical Wood Group Submersible Pumps, Inc.’s Sub Maintenance Program
by: Jon Hale, Alan Martinez — Added 6/9/2009 12:00:00 AMSWPSC - General


High volume artificial lift through the use of submersible pumps has become common place in the Permian Basin. Many operators have made a significant investment with the use of submersible pumps, and, therefore, it is imperative that their submersible pump program attains long runtimes, encounters limited failures, and maintains efficient oil production. To successfully operate submersible pumps, it is critical to have the capability to monitor and evaluate the overall performance on a routine basis utilizing timely, accurate data. One option is the use of Electrical Submersible Pump’s (ESP’s) “Sub Maintenance Program”, in which pertinent data is captured and presented in a format where well information can be interpreted so that proactive decisions can be made. Among the opportunities identified by the Sub Maintenance Program are production enhancements, reduction of power costs, reduction of submersible pump failures, and the proper utilization of submersible pump inventory.