Claims
- 1. A method for cleaning fill from a borehole, comprising:
disturbing particulate solids of the fill while RIH with a coiled tubing assembly circulating at least one cleanout fluid through a nozzle having a jetting action directed downhole; creating particle entrainment by POOH while circulating at least one cleanout fluid through a nozzle having a jetting action directed uphole; and controlling a pump rate of cleanout fluid and a coiled tubing assembly POOH rate according to at least one of a selected pump rate regime and a selected POOH rate regime such that substantially all particulate solids of the fill are maintained uphole of an end of the coiled tubing assembly during POOH.
- 2. A method for cleaning fill from a borehole in one wiper trip, comprising:
jetting downhole, through a nozzle connected to coiled tubing, at least one cleanout fluid during at least a portion of RIH; jetting uphole through a nozzle connected to the coiled tubing at least one cleanout fluid during at least a portion of POOH; pumping, during at least a portion of POOH, at least one cleanout fluid at a selected pump rate regime; POOH, for at least a section of the borehole, at a selected POOH rate regime; and substantially cleaning the borehole of fill.
- 3. The method of claim 1 wherein controlling pump rate includes controlling an in-situ liquid phase velocity.
- 4. The method of claim 1 wherein controlling pump rate includes controlling the effect of gas-liquid slip velocity on in-situ liquid phase velocity and multi-phase flow.
- 5. The method of claim 1 that includes computer modeling to determine a value for a limiting concentration of solids in a slurry for a selection of cleanout fluid and a liquid in-situ velocity.
- 6. The method of claims 1 or 2 that includes high energy jetting downhole.
- 7. The method of claims 1 or 2 that includes low energy jetting uphole.
- 8. The method of claims 1 or 2 that includes reaching a target depth with the coiled tubing between a RIH and a POOH.
- 9. The method of claims 1 or 2 that includes switching a direction of cleanout fluid in a nozzle between a downhole direction to an uphole direction.
- 10. A method for cleaning a borehole of fill, comprising:
sweeping back at least one uphole directed jet connected to coiled tubing while POOH at a selected POOH rate regime; pumping at least one cleanout fluid at a selected pump rate regime down the coiled tubing and out the at least one uphole directed jet during at least a portion of POOH; and selecting, by computer modeling, at least one of pump rate regime and POOH rate regime such that one sweep substantially cleans the borehole of fill.
- 11. The method of claim 10 that includes selecting a pump rate regime and a POOH rate regime prior to sweeping.
- 12. The method of claim 10 that includes selecting at least one of a pump rate regime and a POOH rate regime during a running of the coiled tubing in the borehole.
- 13. The method of claim 10 wherein the uphole directed jet. includes a low energy jet.
- 14. The method of claims 1, 2 or 10 wherein a pump rate regime is selected at least in part based on computer modeling taking into account at least one well parameter and at least one equipment parameter.
- 15. The method claim 10 that includes jetting the coiled tubing into fill in the borehole during RIH using at least one downhole directed jet connected to the coiled tubing.
- 16. The method of claim 15 wherein the downhole directed jet includes a high energy jet.
- 17. The method of claims 1, 2 or 10 wherein the borehole includes at least a horizontal portion.
- 18. The method of claim 10 that wherein the computer modeling takes into account well parameters for the borehole and equipment parameters for the cleaning.
- 19. The method of claim 18 wherein the well parameters include well geometry and well pressure and wherein the equipment parameters include coiled tubing diameter and type of cleaning fluid.
- 20. The method of claim 18 wherein the modeling takes into account friction pressure and shear rates within the borehole.
- 21. The method of claim 18 wherein the modeling takes into account two phase flow and particle slip.
- 22. The method of claims 1, 2 or 10 wherein the at least one cleaning fluid includes two phase fluid.
- 23. The method of claims 1, 2 or 10 wherein a POOH rate regime is selected at least in part based on computer modeling taking into account at least one well parameter and at least one equipment parameter.
- 24. The method of claims 1, 2 or 10 wherein the borehole includes a deviated portion.
- 25. A method for cleaning out a borehole of particulate matter, comprising:
modeling a cleanout, taking into account a plurality of well parameters and a plurality of equipment parameters, to produce at least one running parameter regime predicted to clean to a given degree the borehole with one wiper trip of coiled tubing attached to at least one forward jet and one reverse jet; and cleaning the borehole to attain the given degree of cleanout with the coiled tubing, implementing said at least one produced running parameter regime.
- 26. The method of claim 25 that includes selecting a running parameter regime to minimize costs.
- 27. The method of claim 25 wherein the modeling includes pre-modeling and real-time modeling and wherein the cleaning includes selecting a first combination of running parameters produced from pre-modeling and selecting a subsequent combination of running parameters produced from real-time modeling.
- 28. The method of claim 25 that includes attaining substantially complete particulate removal in one wiper trip.
- 29. Apparatus for cleaning fill from a borehole, comprising:
a nozzle adapted to be attached to coiled tubing, having at least one high energy jet directed downhole; at least one low energy jet directed uphole; and means for switching in the nozzle fluid flow from the coiled tubing from the at least one high energy jet to the at least one low energy jet.
- 30. A method for cleaning fill from a borehole in one wiper trip, comprising:
computer modeling solids transport in a deviated borehole while POOH with coiled tubing according to a POOH rate regime and while jetting uphole at least one cleanout fluid according to a cleanout fluid pump rate regime.
- 31. The method of claim 30 including modeling two phase flow in the borehole.
- 32. The method of claim 30 wherein the modeling computes in-situ liquid phase velocity.
- 33. The method of claim 30 wherein the modeling computes an effect of gas-liquid slip velocity on in-situ liquid phase velocity in multi-phase flow.
- 34. The method of claim 30 wherein the modeling computes a value for a limiting concentration of solids in a slurry for a choice of cleanout fluid and fluid in-situ velocity.
- 35. The method of claim 30 wherein the modeling takes into account the rheology of the cleanout fluid and the configuration of a jetting nozzle.
- 36. The method of claim 30 wherein the modeling outputs a maximum value of a RIH speed and a POOH speed for which all particulate matter will be circulated out of the well.
- 37. A method for cleaning fill from a borehole in one wiper trip, comprising:
RIH through fill with CT while circulating at least one cleanout fluid through a downward directed jet; POOH while jetting at least one cleanout fluid uphole such that a leading downhole edge of a fill bed is entrained; and POOH at a rate such that an equilibrium bed is established uphole of the jet.
- 38. The method of claims 1, 2, 15 or 37 wherein RIH includes running through a portion of substantial fill.
Parent Case Info
[0001] This application claims priority based on provisional application Serial No. 60/200,241 filed Apr. 28, 2000.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60200241 |
Apr 2000 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09799990 |
Mar 2001 |
US |
Child |
10429501 |
May 2003 |
US |