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10 Habits of Highly Successful DFITs


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The 10 Habits of Highly Successful DFITs is presented by Reservoir Data Systems, a leader in data acquisition, visualization, and integration in the oil and gas industry.
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10 Habits of Highly Successful DFITs

  1. 1. 10 Habits of Highly Successful DFITs
  2. 2. What has the greatest effect on the success of a DFIT? A. Quality of gauge B. Pump company C. Rate D. Volume E. Length of monitoring period F. Ability to Capture Data* *AKA, don’t mess up the test
  3. 3. Habit #1 Communicate and ensure everyone is on the same page
  4. 4. 1. Well Selection 2. Selection of Equipment 3. Installation of Equipment 4. Job Execution 5. After Job Procedure Communicate, Communicate, Communicate!
  5. 5. SPE 169539-MS, Barree, Miskimins, and Gilbert
  6. 6. Break Down Observed, Fracture Initiated Well Compressibility Conclude Injection with Stepdown and Obtain ISIP Increase to Max Rate Quickly and Hold Constant
  7. 7. Habit #2 Keep a clean house and test your equipment before pumping
  8. 8. Have you ever asked to flush the lines thoroughly? Physical debris can cause majors issues while you’re pumping Bottle Cap Rock
  9. 9. Habit #3 Ensure that procedures and installations do not conflict
  10. 10. What Happened here?
  11. 11. A Wellhead Isolation Tool required moving the position of the pressure gauge during the test. This resulted in lost data.
  12. 12. Pump 1 kicked out due to exceeding pressure limit
  13. 13. Job continued to pump with only one remaining pump
  14. 14. Job was successfully pumped with one pump DO NOT fight equipment issues if you don’t have to!
  15. 15. Habit #4 Always consider the weather Always consult the temperature data!
  16. 16. What happened here? Let’s look at the temperature data and see
  17. 17. Anytime gauges have a sustained temperature below 30*F there’s a chance of freezing at the wellhead
  18. 18. Freezing issues directly impact pressure responses. Mitigate this possibility by checking the weather and using wellhead heaters/insulation when possible
  19. 19. Habit #5 A procedure is only as good as it is understood
  20. 20. In this next example the operator told the field personnel to pump methanol to mitigate potential freezing issues
  21. 21. Stepping up pressure to open sliding sleeve
  22. 22. Sleeve opened and DFIT performed
  23. 23. Well is shut-in and DFIT begins to leakoff
  24. 24. Methanol was injected to prevent freezing
  25. 25. Methanol was supposed to be pumped during the test NOT AFTER! This test was ruined because the field DID NOT understand the procedure
  26. 26. Habit #6 Make quality data a PRIORITY You get what you pay for
  27. 27. Rate Variance of 0.95 bbl/min Pressure Variance of 360 psi 3.5 bbls more than actually pumped, slight effect on Permeability Effects your ISIP, Closure Pressure, and Reservoir Pressure
  28. 28. Do NOT trust the rate from pump strokes!
  29. 29. Counting Pump Strokes shows steady Rate Turbine Rate comparison highlights errors caused by pumping efficiency
  30. 30. Acquiring actual injection rate is critical since injected volume is one of the most important inputs in the analysis
  31. 31. Habit #7 Consider how physical factors effect your data and mitigate them as much as you can
  32. 32. Surface Pressure shows thermal effects
  33. 33. Bottom-hole Pressure fluctuates even though the Bottom-hole Temperature stays constant
  34. 34. Thermal fluid expansion can have a significant effect on Pressure, even bottom-hole Pressure If you expect the possibility of freezing events, understand that this effects the entire wellbore, not just the surface data
  35. 35. Habit #8 Be aware of concurrent or nearby operations
  36. 36. Plan for and anticipate frac hits! This frac hit ruined this test
  37. 37. Habit #9 Always verify before making changes
  38. 38. What happens next?
  39. 39. The pump company forgot to isolate the iron when rigging down after the injection
  40. 40. Ruining the test
  41. 41. Habit #10 Monitor your data!
  42. 42. Everything looks just fine right?
  43. 43. The well went on vacuum almost 20 minutes later
  44. 44. Had this operator not been monitoring their data, they could have wasted WEEKS of rental time and money
  45. 45. 1. Communication is critical 2. Clean up and test equipment 3. Does the procedure conflict with the reality? 4. Consider the weather 5. Is the procedure actually understood? 6. You get what you pay for – Quality is CRITICAL 7. Mitigate physical factors 8. Be aware of concurrent operations 9. Always verify 10. Monitor you test! Habits That Promote Success
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