ALRDC Technical Library

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2.8 Years of Field Performance of High Density Polyethylene Sleeved Sinkerbars (Polybars)
by: Scott W. Long, James Franklin, Don Dillingham, James M. Northcutt, Albert Garza, Ed Gipson, David Snapp — Added 6/9/2009 12:00:00 AMSWPSC - BP Sucker Rods

During the past 18 years, rod strings installed with Sinker bars have proven to reduce down stroke buckling, while maintaining tension in all rods above a properly designed Sinker bar section. The result has been reduced rod-on-tubing wear, extended tubing and sucker rod life.

During the past 5 years, use of High Density Polyethylene liners in oilfield tubing has also shown to extend tubing life. The wear resistance and coefficient of friction of polyethylene liners has reduced rod-on-tubing wear.

The benefits of these successful oilfield products have been combined in a new product. This High Density Polyethylene Sleeved Sinker bar trade named a Polybar provides the wear resistance and coefficient of friction of polyethylene with the resistance to buckling of a Sinker bar.

Results of a 2.5 year test program involving five (5) producing wells has documented no tubing leaks occurring in tubing protected by Polyethylene Sleeved Sinkerbars or Polybars.

Coiled Tubing Conveyance of Well Fluids to Surface
by: Humberto Leniek — Added 9/20/2009 12:00:00 AMSWPSC - BP Sucker Rods

Availability of CT as well known OCTG and the need to have new options on artificial lift prompted a CT consulting firm to investigate the use of CT to convey well fluids to the surface. While numerous test proved that CT as “hollow sucker rods” can replace conventional sucker rods and production tubing, the lack of appropriated coil tubing units to deploy and retrieve CT economically delays the application of this innovative option. The paper will discuss new CTU designs and economics related to the use of CT versus solid sucker rods, and the latest developments in artificial lift with coiled tubing.
This paper will describe laboratory testing, field application methods and case history results of the application of salt inhibiting treatments in several applications.

Coiled Tubing for Artificial Lift
by: Humberto Leniek — Added 9/20/2009 12:00:00 AMSWPSC - BP Sucker Rods

Availability of CT as well known OCTG and the need to have new options on artificial lift prompted a CT consulting firm to investigate the use of CT to convey well fluids to the surface in oil and gas wells.

The first idea consisted of a stationary CT attached to a modified rod pump to convey fluids to surface by the use of hydraulic pulses. This first approach triggers a second idea consisting in the reciprocation of CT as hollow sucker rod in rod pumping wells. Numerous tests for diverse applications are being performed with results to be covered in this paper.

Because of the consequences of these innovations, another idea was tested, this time to reciprocate a subsurface pump capable of using the full cycle of the pumping unit with either conventional rods or CT. Latest field test results are part of this paper.

by: Jeff Harris, Randy Kuiper, Elton Smith — Added 6/11/2009 12:00:00 AMSWPSC - BP Sucker Rods

Spraberry operators in West Texas have been fighting casing leaks caused by the corrosive fluids in the San Andres formation for years. Water produced by the Dean, Upper and Lower Spraberry formations is disposed of into the San Andres.

There are possibly thousands of Spraberry wells that were drilled and completed without getting cement across the San Andres. This has resulted in the P&A of many of these wells. Spraberry wells will produce 5 –10 BOD for decades, but when the corrosive waters from the San Andres cause casing leaks, it becomes uneconomical to continue producing these wells.

This paper will discuss the combination of slimhole conversion and the installation of a coiled tubing rod string system to solve the corrosion problems in wells that are usually considered P&A candidates. The development of the coiled tubing rod string system will be looked at. Case histories will also be presented.

Comparison of Steel Sucker Rod and Fiberglass/Steel Sucker Rod String Performance
by: Elton J. Smith, T.P. Hopper, Kass Copelin — Added 6/13/2009 12:00:00 AMSWPSC - BP Sucker Rods

Usage of fiberglass sucker rods have proven to be the most efficient means of producing artificial lift wells in the Pioneer Natural Resources, Spraberry Trend Area. Fiberglass/steel designs are being installed on all new drilled wells and will remain in place for the life of the well. In this paper examples will be given of production improvements when going from an all steel to a fiberglass/steel design, various designs which decrease string weight 13 to 26%, benefits of the lighter more elastic rod and comparison of failure data. Procedures used by Pioneer will be discussed to assist operators in selecting the best design for different well characteristics.

by: Ken Carstensen — Added 6/10/2009 12:00:00 AMSWPSC - BP Sucker Rods

The steel API sucker rod connection design used in beam and progressing cavity pumping systems has been an industry standard since the 1920’s. During these many years of continuous use, improvements have been made both large and small, yet this three part connection system is responsible for the majority of rod string failures. After 3 ½ years of development we now bring to the industry a new API modified four part design with a method and system for precise makeup which expand load bearing capabilities and extend the working life of sucker connections. This paper describes development and testing work performed, information acquired, systems and methods created, and how the new API modified connection solves problems, eliminateS or greatly extends time between failures keeping work over and associated costs to a minimum.

Questions and Issues Surrounding Sucker Rod Connection Integrity and Their Effect on Well Failure Rates
by: Fred Newman — Added 6/12/2009 12:00:00 AMSWPSC - BP Sucker Rods

The questions and issues surrounding sucker rod connection integrity and its effect on well failure rates has been around as long as the sucker rod itself. The standards set by the manufactures of rods and couplings, the service rigs that run and pull them, and the use in the field will be discussed, explored, and investigated using actual field data looking for methods to improve the reliability of sucker rod connections.

High speed torque turn data during tong rotation is presented and the analysis of this data, both in the disassembling process as well as the makeup process will be evaluated. Type curve fitting for connection evaluation and real time alarming to the crews will be presented and discussed.

by: Gary Abdo — Added 6/10/2009 12:00:00 AMSWPSC - BP Sucker Rods

A wet plastic wear test machine was designed and built by R&M Energy Systems to estimate life expectancy of plastics in down-hole environments. Currently there is no set standard for testing wear rates of plastics in wet environments. The oil industry has several choices of rod guide plastics, but no accurate way of determining which will give a longer run life. This second generation machine uses a data acquisition system to record all sample wear rates, temperature and rotational speed. The machine is capable of running a large variation of fluids and temperatures.