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Oil & Gas Automation
Unico, Inc. Copyright © 2002 All trade designations |
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Artificial Lift Comparison Summary |
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| Pumping System |
Pumping Speed (spm, rpm) |
Production Rate (bpd) |
Input Power (kW) |
Lift Power (kW) |
Energy Efficiency (%) |
Cost per Barrel ($) |
| Sucker Rod | 3.0 | 108 | 10.1 | 2.97 | 29.4 | 1.34 |
| 6.0 | 227 | 13.3 | 6.23 | 46.8 | 0.85 | |
| 9.0 | 362 | 20.8 | 9.94 | 47.9 | 0.88 | |
| 12 | 500 | 31.4 | 13.7 | 43.8 | 0.90 | |
| 15 | 637 | 47.1 | 17.5 | 37.1 | 1.07 | |
| Rotaflex | 1.0 | 110 | 4.33 | 3.02 | 69.8 | 0.57 |
| 2.0 | 222 | 8.75 | 6.10 | 69.7 | 0.57 | |
| 3.0 | 338 | 14.3 | 9.28 | 65.0 | 0.61 | |
| 4.0 | 461 | 20.3 | 12.7 | 62.4 | 0.63 | |
| 5.0 | 586 | 26.9 | 16.1 | 59.8 | 0.66 | |
| Electric | 2,355 | 82 | 15.5 | 2.24 | 14.5 | 2.73 |
| Submersible | 2,643 | 227 | 19.8 | 6.27 | 31.5 | 1.26 |
| 2,930 | 299 | 25.2 | 8.21 | 32.5 | 1.22 | |
| 3,216 | 358 | 31.9 | 9.85 | 30.8 | 1.28 | |
| 3,500 | 411 | 39.9 | 11.3 | 28.3 | 1.40 | |
| 3,783 | 460 | 49.4 | 12.7 | 25.6 | 1.55 | |
| Progressing | 175 | 109 | 26.1 | 2.98 | 11.4 | 3.42 |
| Cavity | 200 | 206 | 29.5 | 5.62 | 19.1 | 2.06 |
| 225 | 303 | 33.0 | 8.30 | 25.1 | 1.57 | |
| 250 | 399 | 36.6 | 11.0 | 30.0 | 1.32 | |
| 275 | 493 | 40.3 | 13.7 | 33.9 | 1.17 | |
| 300 | 587 | 44.0 | 16.4 | 37.2 | 1.08 | |
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System efficiency and energy costs versus flow for PCP and |
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efficiency tends to increase in proportion to pumping speed. All pumping systems lose efficiency at low volumes due to leakage effects.
DriveLink™, Unico's drive-monitoring software for personal computers, has recently been enhanced to provide graphical displays of well performance. The software, which allows a user to setup and monitor up to 99 drives from a Windows-based PC, is typically used to capture well production information, reset control functions, archive setup data, and display operating parameters.
Newly added enhancements include a chart-recorder-type plot that can be used to display rod-pump gearbox torque as a function of time, a circle chart commonly used for displaying motor torque in ESP applications, and an X-Y mode that can display rod-pump load and position in the familiar dynagraph format for analysis.
Contact us to learn more about DriveLink™.
A software upgrade has been developed for existing pump-jack controls that provides many of the advantages of our latest pump-jack drive systems with the simple change of a chip.
Over the years, thousands of Unico variable-speed drives have been installed on pump jacks, many under the tradename Northlander™. The earliest units were limited to single-speed operation. Dual-speed control was added a number of years ago to improve well production using independent upstroke and downstroke speed settings. Both types of control required the operator to manually select the appropriate speed to maximize production while avoiding fluid pound and bridle separation problems.
Our latest generation pump-jack systems automate this process by selecting the ideal pumping speed based upon pump fillage. The new control, which incorporates many other improvements as well, requires use of the latest 40 MHz control module. However, a software upgrade is now available that provides older pump-jack systems with many of the enhancements of the new platform with a simple firmware change. Contact us for information on obtaining the upgrade if the features below would benefit your operation.
| Class I Beam Pump Drive Upgrade Features | |
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Designed specifically for Class I beam pumps |
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Operates without load cells and position sensors |
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Assists in counter-balance selection |
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Continuously computes pump fill |
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Provides manual single- and dual-speed operation |
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Automatically optimizes speed using pump fill |
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Allows variable-speed or start/stop pump-off control |
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Provides continuous readout of crank angle |
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Prevents damaging downstroke bridle separation |
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Saves energy by optimizing pump fill |
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Constant-power control allows increased sheave ratios |
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Provides a serial communication channel for remote data access |
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Includes both RTU and ANSI II communication protocols |
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Integral dynamic braking option included in new 1105 series drives |
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Using harmonic filters to satisfy utility power quality regulations |
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Software option allows use of Palm Pilots for monitoring and archiving well parameters |
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1110 series drives allow operation of artificial lift pumps from single-phase power sources |
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Rotaflex maximum pumping capacity increased 33% using novel speed control |
A Comparison of the Energy Efficiency of
