1. Total Well Management Lynn Rowlan Beam Pumping Workshop Houston, Texas
October 4 - 7, 2005
Total Well Management
Lynn Rowlan

2. Analysis STEPS to Apply the Concept of Modern Total Well Management:
Analyze the well’s inflow performance to determine if additional production is available.
Determine the overall efficiency to identify wells that are candidates for improvement.
Analyze the performance of the pump.
Analyze the performance of the down hole gas separator.
Analyze mechanical loading of rods and pumping unit.
Analyze performance of prime mover.
Design modifications to existing system.
Implement changes and verify improvement.

3. LIQUID LEVEL EQUIPMENT USED TO PERFORM ACOUSTIC TEST

4. ACOUSTIC SURVEYS ANSWER THE FOLLOWING WELL PERFORMANCE QUESTIONS:
What is the depth to the top of the liquid?
Does liquid exist above the pump?
Does the liquid in the casing annulus restrict production?
What is the maximum production rate available from the well?
What is the casing-head pressure? Does it restrict production?
What is the percentage of liquid in the annular fluid column?
Is gas flowing up the annulus? At what rate?
What is the gas gravity?
Are there any restrictions or anomalies in the annulus?

5. SINGLE and MULTI- SHOT ACOUSTIC TESTS
SINGLE SHOT ACOUSTIC TESTS DETERMINE THE LIQUID LEVEL DEPTH , BOTOM HOLE PRESSURES AND WELL INFLOW PERFORMANCE AND THE MAXIMUM PRODUCTION RATE.
MULTI-SHOT PRESSURE TRANSIENT TESTS DETERMINE THE PERFORMANCE OF THE FORMATION, SKIN DAMAGE AND RESERVOIR PRESSURE.
MULTI-SHOT ACOUSTIC LIQUID TRACKING TESTS PERMIT LIQUID LEVEL TRACKING IN WORKOVER AND DRILLING OPERATIONS.

6. Acoustic Time to Well Depth Relationship
1. The Depth from the gun to an anomaly in the casing annulus is directly proportional to the time, RTTT, for the acoustic pulse to travel from the gun down the casing to the anomaly and reflect back to the microphone.
2. Microphone housed in the gas gun detects the blast from the shot and reflected sound from collars, liners, perforations, liquid level, plus other obstructions in the annulus.

7. Depth to Down-Hole Anomaly
LIQUID LEVEL ANALYSIS
Depth to Down-Hole Anomaly

8. LIQUID LEVEL ANALYSIS Automatically Count Collars to Liquid Level
Other Methods: Acoustic Velocity Downhole Marker

9. LIQUID LEVEL ANALYSIS Measure Annular Gas Flow Rates
Test casing-pressure-buildup by closing the casing valve while the well pumps and gas flows for a short time into the annulus.
The rate at which casing pressure increases is measured.
Accurate annular gas flow rate & %liquid can be determined from a casing pressure buildup test.
Measurement of small pressure changes require precision instrumentation.

10. 11.5 BOPD Additional Production Available

11. DYNAMOMETER TRANSDUCERS Determine Position and Load

12. DYNAMOMETER SURVEYS ANSWER THE FOLLOWING QUESTIONS:
Is the well pumped off?
What is the pump intake pressure?
What is the pump fillage? And pump displacement?
What is the current pumping speed?
Are the traveling and/or standing valves leaking?
Are the maximum and minimum rod loads within limits?
What is the polished rod and pump horsepower?
Is the gearbox overloaded? Is the unit properly balanced?
What movement of the counterweights will balance the unit?
Is the downhole gas separator operating effectively?

13. Dynamometer Analysis:
Surface Dynamometer cards for designing and diagnosing surface problems.
Rod String
Pumping Unit
Pump Problems
Excessive Friction
Pump card for analysis of downhole problems.
Unanchored Tubing
Tubing Leak
Surface Card
Pump Card

14. Are Traveling And Standing Valve Load Tests OK?
Traveling Valve Test
Traveling Valve Load Test shows load loss during valve check due to the diametric clearances (0.008” above) between the pump plunger and barrel.

15. System Efficiency is 39% mainly due to a poor gas separator
Well Starts up With Low Pump Fillage After Being Down 10 Minutes Indicating A Poor Downhole Gas Separator
System Efficiency is 39% mainly due to a poor gas separator

16. After gas Separator System Efficiency increased from 39 % to 54%
After Installation of a Good Gas Separator, Well Starts Pumping with Complete Pump Fillage After Being Down 10 Minutes
After gas Separator
Pumped
Off
37 Full
Strokes
System Efficiency increased from 39 % to 54%

17. Measurement of Instantaneous Power
TWO CURRENT SENSORS
THREE VOLTAGE SENSORS

18. MOTOR POWER SURVEYS ANSWER THE FOLLOWING QUESTIONS:
What is the overall electrical efficiency of the pumping system?
Is the overall electrical efficiency above 50%?
What is the power consumption, $/month, $/BBL, and power demand, KW?
What is the motor current? Does the motor overheat?
Does the motor generate electricity at some time during the stroke? Is credit allowed for generation?
Is the gearbox overloaded?
Is the pumping unit properly balanced?
What movement of counterweights required to balance unit?

19. OVERALL SYSTEM EFFICIENCY
OVERALL SYSTEM EFFICIENCY IS DEFINED AS THE AMOUNT OF THEORETICAL WORK REQUIRED TO LIFT THE LIQUID FROM THE NET LIQUID LEVEL DEPTH TO THE SURFACE DIVIDED BY THE AMOUNT OF POWER SUPPLIED TO THE MOTOR
RESERVOIR PERFORMANCE ANALYSIS
MOTOR INPUT POWER MEASUREMENT

20. Motor Power and Electrical Cost Analysis
System Efficiency

21. PRESSURE TRANSIENT SURVEYS ANSWER THE FOLLOWING WELL PERFORMANCE QUESTIONS:
What is the reservoir pressure?
What is the producing bottomhole pressure?
What is the liquid/gas annular flow after the well is shut in?
Is there any wellbore damage? How much Skin? What's the Permeability?
Does the formation need treatment?
Is the well fractured?

22. PRESSURE TRANSIENT - HORNER

23. Buildup Test: Bottom Hole Pressure vs. Time
Original SBHP estimate

24. Artificial Lift Analyst Function:
Goal is to answer the WELL PERFORMANCE QUESTIONS
Time Requirement is about 45 minutes per well.
Analyze collected data at the well.
Make recommendations to fix any problems discovered.
Record work necessary to fix problem as notes in the comments text box.
When recommended changes completed, new data should be collected once the well stabilized
Notice if well performance changed as planned.
Follow-up on recommendations to learn from successes and failures
Role changes from a data collector to a knowledgeable well analyst and problem solver.

25. MODERN TOTAL WELL MANAGEMENT OF ARTIFICIAL LIFT WELLS PERMITS:
AN OPERATOR TO ANALYZE THE PERFORMANCE OF WELLS
IMPROVE OPERATIONS
LESS TIME AND EFFORT EXPENDED
INCREASE OIL AND GAS PRODUCTION
REDUCE THE OPERATING EXPENSE.

26. Questions ?