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Comparative Analysis
Scott W. Long, P.E., SPE and Donald W. Bennett,
SPE, Flexbar, Inc.
This analysis is based on an actual application installed by a major
oil company in February 1988. Actual data gathered substantiates these
predictives.
| |
ALL STEEL |
GLASS/
STEEL |
GLASS/
SINKERBAR |
| Design |
| Sucker Rod String
Design |
API 87 |
1.25" glass
1" steel rod |
1.25" glass
1.625" sinker |
| Percent Taper |
36%/64% |
60%/40% |
79%/21% |
| Constant Factors
- identical numbers were used for Depth, Pumping Unit, Prime Mover,
Stroke Length, Pumping Speed, Pump Size, and Pump Intake Pressure. |
| Production |
| Production (BBL/day) |
916 |
963 |
1110 |
| Increase |
--- |
5.1% |
21.2% |
| Efficiency |
| Power Required (HP) |
70.3 |
72.3 |
78.0 |
| Efficiency (BBL/HP) |
13.03 |
13.32 |
14.231 |
| Increase |
--- |
2.2% |
9.2%
|
| Rod Loading |
| Unit Torque (in balance-x1000 in./lbs.) |
630.5 |
594.9 |
602.0 |
| Percent of Rating |
98.5% |
93.0% |
94.1% |
| Peak Polish Rod Load |
25,938 |
22,387 |
22,979 |
| Min. Polish Rod Load |
4,322 |
2,837 |
3,324 |
| Rod Loading (%) |
* 104% |
91% |
89% |
| Buoyant Rod Weight |
10,404 |
7,262 |
9,179 |
* Class D Rods @ 1.0 Service Factor
Conclusions
Fiberglass/Sinkerbar Design VS API Steel
Design
| Efficiency |
9.2% Increase |
| Production |
21.2% Increase |
| Rod Loading |
14.4% Decrease |
Fiberglass/Sinkerbar Design VS Fiberglass/Steel Rod Design
| Efficiency |
9.1% Increase |
| Production |
13.2% Increase |
| Rod Loading |
2.2% Decrease |
Flexbar Sinkerbars and fiberglass sucker rods can produce
more fluid more efficiently in many cases. Let us help you design a better
rod string today!
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