ALRDC Technical Library

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A Current Comparison of Sucker Rod String Design Programs
by: Norman W. Hein, Russell Stevens — Added 6/12/2009 12:00:00 AMSWPSC - Beam Pump Design


A comparison was made between four commercially available sucker rod string design programs: Rod Star, S-Rod, Q-Rod, LoadCal B and a proprietary, modified API RP11L based program. These programs used the same input requirements, where applicable, and their outputs compared dynamometers cards from five different producing wells. The results show differences in the anticipated major design loads along with differences in the output information. Recommendations are made on potential changes to these programs and comments are made on things to consider when these programs are used.

Fiberglass Sucker Rod and Steel Sinkerbar Rodstring Designs
by: Fred Morrow, Scott W. Long — Added 9/20/2009 12:00:00 AMSWPSC - Beam Pump Design


This paper documents 8 years of performance of an improved artificial lift system installed in a secondary recovery project.

This improved artificial lift system matches a Fiberglass-Sinkerbar rodstring design to a specific pumping unit installed with a Pump-off Controller.

Fiberglass-Sinkerbar rodstring designs have been given little or no consideration concerning reduced downhole rod and tubing failures or power consumption costs.

The success of this improved artificial system has led to the following improvements in field performance:
1. Increased lift capacity from 20 cmpd (126 bfpd) to 100 cmpd (629 bfpd)
2. Runtimes between failure in excess of 1450 days (4.2 years)
3. Reduced power costs from .070 to .061cents/barrel
4. Lower operating expenses due to reduced power consumption, reduced maintenance costs and less downtown.

Utilization of this improved artificial lift system will increase lift capacity, reduce downhole

Long and Slow Versus Short and Fast; Is There a Preference for Sucker Rod Lift Optimization?
by: Norm Hein — Added 9/20/2009 12:00:00 AMSWPSC - Beam Pump Design


There has been the concept that a long stroke and slow pumping speeds are the best way to design sucker rod lifted wells. Typically, longer fatigue life is one of the reasons to rationalize this practice. Additionally, slow versus fast pumping speeds are relative numbers. This paper will discuss the various operating concepts, the background on pumping equipment capabilities, maximum design considerations and provide rod string design comparisons showing rod loading and power comparisons resulting in new considerations for optimizing sucker rod lifted wells.

New Design API Modefied Sucker Rod Connection and Methods and Systems for Precise Sucker Rod Connection Makeup - An Update
by: Carstensen — Added 9/19/2009 12:00:00 AMSWPSC - Beam Pump Design


At the 50th Annual Southwestern Short Course in 2003, a paper was presented titled “New Design API Modified Sucker Rod Connection and Methods and Systems for Precise Sucker Rod Connection Makeup”. This paper is an information update of continuing development and field applications of the four part api modified connection system in pcp and beam pumping wells. The paper also includes a study of in-plant single end coupling makeups on the three part standard api couplings employing the “precision coupling makeup system” where volumes of used inspected api number one class sucker rods of all sizes and grades were returned to field service. The study also contains an analysis of the mechanical and economical benefits of receiving the rods at the rig site with the couplings properly made up on one end and performing a single end makeup with the rod tongs at the workover rig, as opposed to the standard practice of the “floating coupling” or double end connection makeup.

Power Consumption Test Fiberglass-Sinkerbar (FGSB) Design vs. API Steel Design
by: Scott Long, Kyle Chambliss, Fred Morrow — Added 9/20/2009 12:00:00 AMSWPSC - Beam Pump Design


A series of tests measuring power consumption were conducted at the Texas Tech Red Raider Test Well. This test facility is located 5 miles northeast of the campus of Texas Tech University in Lubbock, Texas.

This paper introduces the Red Raider Test Well and all of it’s abilities for testing various components of a rod pumping artificial lift system to unprecedented level of accuracy.

This test measured the power consumed by the beam pumping system with all variables held co nstant except the surface stroke length and rodstring design.

The result of this test was a 14.9 % power savings utilizing a Fiberglass–Sinkerbar design as compared to an API Steel Design. This power savings exceeded the 10% threshold required by the State of Texas for a severance tax credit.

This paper demonstrates the need to consider power costs when designing and installing artificial lift systems.

Rod Pumping Deviated Wells
by: Jun Xu, Andy Cordova, Dennis Shipp — Added 9/20/2009 12:00:00 AMSWPSC - Beam Pump Design


More and more directional wells are being drilled to maximize hydrocarbon recovery and overcome environmental restriction. Today’s state of art predictive software for rod pumping can be used to design and optimize rod pumping in deviated wells as well as vertical wells. Previously, traditional methods including wave equation techniques assume that the wellbore is vertical. Applying these methods to rod pumping in deviated wells will result in substantial errors and cause inappropriate design. The new technique considers a deviation survey for the 3-D borehole trajectory and rod/tubing drag in the predictive design method. The paper examines a real case for a severely deviated well by using the new software, showing best practices, sensitivity analysis and optimization.

Solar Powered Rod Pumping System, Where Bigger is not Better
by: Lynn Rowlan, Mike Poythress, Gordon Gates — Added 9/20/2009 12:00:00 AMSWPSC - Beam Pump Design


Continuous Fiberglass Rod pump jacks system designed for efficient low horsepower are beginning to be used for dewatering of gas wells. These systems are easily transportable and erected; and are designed for low maintenance. Typically less than a 1 HP solar powered DC electric motor drives this pumping system to produce usually less than 10 barrels of liquid per day from the well. This system is designed for the removal of solids in the produced fluids and resists wear and tear due to abrasion and from over pumping the well. This innovative technology is best applied to shallow gas wells in remote locations where electric power may not be available and where a small amount of liquid loading is reducing gas flow from the well.

A bank of batteries and a charging system are incorporated to provide power to the pumping system on overcast days and at night. A controller allows for multiple run cycles throughout a 24 hour day, to match the system design with the well’s production.