Coiled tubing wellbore cleanout
AssigneeBJ Services Company
InventorsScott A. Walker, Jeff Li, Graham Wilde
Life of this patent
Estimating the term…
Abstract
Method and apparatus for substantially cleaning fill from a borehole, variously including in preferred embodiments disturbing particulate solids of fill while RIH, entraining particulates while POOH, jetting downhole while RIH and jetting uphole while POOH, and controlling at least one of a pump rate regime or a POOH rate regime.
Claims38
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.
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.
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.