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Sucker Rod Pump Design
91
Transcript
Sucker Rod Pump
Two types of DHP
- Abrasion from Soilds
- Corrosion (Galvanic, H S embrittlement, or acid)
- Scale Buildup
- Normal Wear (Seal and Valves)
- Gas Locking
- Stress from "fluid pounding"
- Rod breaking
- Plunger Jams
• Extra heavy to light oil. ( 8.5-40 degrees API)
• Oil production: 20-2000 STB/day
• GOR: 2.000 PCN/BN
• Maximum Depth: 9000 feet for light oil and 5000 feet for heavy/ extra heavy oil.
• Subsurface equipment stands up to 500 degrees F
• Tolerant to solids production. (5-10% volume)
• Tolerant to pumping off conditions.
Sucker Rod Pump Design
PENG-332
Well Completion and Workover
Aly Morad
Mohamed Fayez
Ahmed El Ghandour
Problems
2
Design Considerations
Gas Locking
- Weight of Rod String
- Weight of Fluid
- Maximum Stress in Rod
- Yield Strength of Rod material
- Stretch
- Buckling
- Fatigue Loading
- Inertia of rod and fluid as it goes through a stroke
- Buoyancey
- Friction
- Wellhead Pressure
gas
Solution
Abrasion & Corrosion
Gas
Oil
Range of Application
Artificial Lift
Solution
Fiberglass-Steel Composite Rod
Generally achieved by the use of a mechanical device inside the well (pump or velocity string)
Needed in wells when there is insufficient pressure.
Increase the production flow.
Downhole Pump
Disadvantages
Advantages
1. Maximum volume decreases rapidly with depth.
2. Susceptible to free gas.
3. Frequent repairs
4. Deviated wellbores are difficult.
5. Reduced tubing bore.
6. Subsurface safety difficult.
7. Doesn’t utilize formation gas.
8. Can suffer from severe corrosion.
1. Possible to pump off.
2. Best understood by field personnel.
3. Some pumps can handle sand or trash.
4. Usually the cheapest.
5. Low intake pressure capabilities.
6. Readily accommodates volume changes.
7. Works in high temperatures.
8. Reliable diagnostic and troubleshooting tools available.
Insert Pump - fits inside the production tubing and is seated in nipple in the tubing.
Tubing Pump - is an integral part of the production tubing string.
- Integral part of production tubing string
- Cannot be removed without removing production tubing
- Permits larger pump sizes
- Used where higher flow rates are needed
- Pump is run inside the tubing attached to sucker rods
- Pump size is limited by tubing size
- Lower flow rates than tubing pump
- Easily removed for repair
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