linear rod pump technology · 2012-11-20 · sucker rod pump (srp) dimensions. feb. 23 - 26, 2009...

Gas Well Deliquification WorkshopSheraton Hotel, Denver, Colorado

February 23 - 26, 2009

Linear Rod Pump Technology Christopher Schmidt and Ron PetersonUnico, Inc

Feb. 23 - 26, 2009 2009 Gas Well Deliquification Workshop Denver, Colorado

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LRP® Revolutionary Artificial Lift Technology


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About Unico, Inc.• Variable speed drive products and systems

• Development, manufacturing, integration, and service

• Leading controls provider since 1967

• Headquartered in Franksville, Wisconsin

• Regional drive centers in Germany, UK, Venezuela, Japan, China

• Privately owned by company employees

• Approximately 400 employees worldwide


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Unico, Inc. Oil and Gas Applications

• Draw works drives

• Centrifuge drives

• Drill string top drives

• Mud pump drives

• Electric submersible pumps (ESPs)

• Progressing Cavity Pumps (PCPs)

• Sucker Rod Pumps (SRPs)

• GPL® Gas-Powered Lift

• LRP® Linear Rod Pump

• CRP™ Crank Rod Pump

• GMC™ Global Monitor and Control System


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Unico, Inc. LRP® (linear Rod Pump) Concept Background

Large transfer presses at GM, Ford, Chrysler, Toyota, Nissan, and Honda require up to 60 electronically controlled rack-and-pinion drives to achieve exceptional production rates


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LRP® Mechanical Background

• PCP to SRP conversions• Reduced installation cost

• Site preparation • Installation equipment • Contractors on location

• LRP® design evolution • Belt drive unit • Ball screw unit • Rack and pinion unit


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LRP® Evaluation Projects

• First LRP® installed in December 2006 • First prototype units ran about 45 days • Rented pick-up used to replace prototypes

• Over 200 LRP® systems installed or pending installation

• 25 oil and gas producers installing LRP® technology• Well depths from 50 to 6,400 feet• Production rates from 5 to 300 bpd• Peak rod loads up to 23,000 pounds


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LRP® Mechanical Design


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Sucker Rod Pump (SRP) Dimensions


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Linear Rod Pump (LRP®) Dimensions


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Reduced Foot Print on Linear Units


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SRP Transportation Logistics


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LRP® Transportation Logistics


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LRP® Installation Methods


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LRP® Casing Mount Option


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LRP® Tubing Mount Option


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LRP® Casing Mount Option


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LRP® Installations at Red River Ranch

Workover rig used to pull the PCP and install the LRP™


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Installing the standoff and working the LRP® into place


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Setting the LRP® on the well


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Tightening the rod clamp


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Filling the LRP® with oil and hugging her for good luck


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Final - clean installation has only one sensor and one motor cable

Final Installation


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When location is cleaned and LRP® is painted it blends into the landscape

Linear Rod Pump


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Typical LRP® and SRP Drive Packages


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Speed Control Modes of Operation

• Single Speed– Same upstroke and downstroke speed from a single speed

source• Dual Speed

– Different upstroke and downstroke speeds from separate speed sources

• Optimized Speed– Controller chooses optimal speed, including reduced speed soft

landing prior to fluid impact.• Variable Pump Stroke

– Ability to “tag” if operator requests• Wide Speed Range Operation

– 2 spm – 20 spm


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General Control Features

• Pump Fill Control– Speed is automatically controlled to maintain

target pump fill• Pump-Off Control

– Pump shuts off for a select time if unable to maintain target fill at minimum speed

• Soft Landing– Using real-time downhole dynamometer feedback,

pump slows down prior to fluid impact anytime pump fill drops below the maximum setting

• Bridle Control– Pump speed is reduced if rod separates from

rack, eliminating violence during reconnection


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Pump Fill Control

Single Speed Control• pump fill monitor 60%• pump average spm 8.0 spm• pump rate monitor 256 bpd• maximum rod load 21,000

lbs

Fill Optimization Control• pump fill monitor 85-100%• pump average spm 5.2 spm• pump rate monitor 270 bpd• maximum rod load 19,500 lbs

Pump fill optimizer independently adjusts up and down stroke speeds


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Conventional Pumping Performance ComparisonExample• Using API

Dimensions•API standard 11E, 1994 (Specifications for Pumping Units)

• Class I Geometry• 96 Inch stroke• 5000’ depth• 1.5 inch pump• 10 SPM


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Rod Velocity Comparison (75% Time Acceleration/Decelerating)

LRP Velocity

Class I SRP Velocity

Trapezoid Profile

• Matched performance


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Rod Velocity Comparison (25% Acceleration Time)Trapezoidal

Profile• Lower Peak

Speeds• Quickly Change

Directions• Faster

Acceleration = Lower Speed During Straightaways

• Cover Greater Distance and Increase Stroke Rate Without Exceeding Rod Fall Velocity Limit

LRP Velocity

Class I SRP Velocity


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Dynamic Profile Manipulation

• Low Inertia of Linear Unit = Near Instantaneous Control

• Linear Pumping Units Allow:– Continuously Variable Polished Rod Motion Profile – Closed-Loop Control of Polished Rod Load

• Dynamic Profile Manipulation Can:– Limit Minimum/Maximum Rod Load– Dampen Rod Load Oscillations– Eliminate Bridle Separation– Provide Soft Landing for Fluid Impact


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Fluid Impact for Fixed Velocity Profile

75% Pump fill• Fluid Pound

Tv Open

Fluid Contact

Pump VelocityRod Velocity


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Fluid Impact for a Soft Landing Velocity Profile

75% Pump fill• Reduce Fluid

Impact Speed (22 in/sec to 6 in/sec)

• Soft Landing• Increase Speed

Elsewhere to Make up for Lost Time

Tv Open

Fluid Contact



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Fixed Velocity Profile Versus Soft Landing Velocity Profile

Fixed Velocity Profile

Soft Landing Velocity Profile(Expanded View)

Pump DecelerationPump Load

Pump Deceleration

Pump Load


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Rod Load Damping ControlPatented Rod Dampening Control• Reduced Peak Polished Rod Loads• Reduced Peak Downhole Pump

Speed from 40 in/sec to 20 in/sec



Rod VelocityPump Velocity


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Rod Load Damping Dynamometer Cards

Rod Damping Control• Reduced Peak polished Rod Load• Minimize Bridle Separation• Reduce Tubing wear



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Rod String Loading With & Without Damping

Rod Damping Control



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SRP & LRP Installations at Dugan Production

• LRP® reduces location foot print and site preparation

• No exposed moving parts on LRP™ increase safety

• Installation costs are reduced and appearance is enhanced


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LRP® with Unico Gas Powered Lift (GPL®)


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LRP® with GPL® on Lake Maracaibo


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LRP® Installation in New Mexico


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LRP® Installation in Venezuela


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Air Balanced LRP® InstallationAir Balance LRP®• 30,000 pound maximum

load• 15,000 pound counter

balance• Programmable

counterbalance effect


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CopyrightRights to this presentation are owned by the company(ies) and/or author(s) listed on the title page. By submitting this presentation to the Gas Well Deliquification Workshop, they grant to the Workshop, the Artificial Lift Research and Development Council (ALRDC), and the Southwestern Petroleum Short Course (SWPSC), rights to:

– Display the presentation at the Workshop.– Place it on the www.alrdc.com web site, with access to the site to be

as directed by the Workshop Steering Committee.– Place it on a CD for distribution and/or sale as directed by the

Workshop Steering Committee.Other uses of this presentation are prohibited without the expressed written permission of the company(ies) and/or author(s) who own it and the Workshop Steering Committee.


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DisclaimerThe following disclaimer shall be included as the last page of a Technical Presentation or Continuing Education Course. A similar disclaimer is included on the front page of the Gas Well Deliquification Web Site.The Artificial Lift Research and Development Council and its officers and trustees, and the Gas Well Deliquification Workshop Steering Committee members, and their supporting organizations and companies (here-in-after referred to as the Sponsoring Organizations), and the author(s) of this Technical Presentation or Continuing Education Training Course and their company(ies), provide this presentation and/or training material at the Gas Well Deliquification Workshop "as is" without any warranty of any kind, express or implied, as to the accuracy of the information or the products or services referred to by any presenter (in so far as such warranties may be excluded under any relevant law) and these members and their companies will not be liable for unlawful actions and any losses or damage that may result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information which therein may be contained.The views, opinions, and conclusions expressed in these presentations and/or training materials are those of the author and not necessarily those of the Sponsoring Organizations. The author is solely responsible for the content of the materials.The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources. The Sponsoring Organizations provide these presentations and/or training materials as a service. The Sponsoring Organizations make no representations or warranties, express or implied, with respect to the presentations and/or training materials, or any part thereof, including any warrantees of title, non-infringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose.

linear rod pump technology · 2012-11-20 · sucker rod pump (srp) dimensions. feb. 23 - 26, 2009...

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