Logic Charts
The following logic tree charts are from API RP11AR publications and are a systematic approach to troubleshooting a problem well for your customer. Some of these charts require the information from a well monitor or dynamometer; however they are a good starting point when talking with your customer who tells you what is happening at the bleeder valve on surface.
It is not always easy to determine what has caused a well to lose production. The problem may involve tubing, rods, casing, formation, as well as a subsurface pump. Using a dynamometer to weigh the well and obtain basic load/time relation can help the trouble shooting process.
The "logic charts" that follow outline a systematic approach to problem well tests.
The following information needs to be collected prior to weighing operations.
1. Production: daily oil, wtr. gas, allowable
2. Pump: size and type
3. Rods: size and type, length of each string
4. Tubing: size, type and seat
5. Mud anchor: size and type
6. Gas anchor: size and type
7. Producing interval and TD or PBTD
8. Motor or engine size
9. Fluid: specific gravity
10. Auxiliary equipment
11. LS and SPM
12. Pertinent well treating data
13. Daily pumping time and schedule
14. Power consumption
15. Calculations: Rod weight in air, Rod weight in fluid, Fluid weight on pump (pounds), Volumetric pump capacity (bbls/day)
For your reference, the Logic Charts are broken up into six areas for your understanding and determination. To view these files, you need Adobe Acrobat© Reader©. Choose "Open file from it's current location" to view this file in your browser. If you do not have Adobe Acrobat© Reader©, download it by going to this page.
Chart 1 - Chart 2 - Chart 3 -Chart 4- Chart 5 - Chart 6
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