초록 ▼

Milling in casing that is over 4½ inches is done with coiled tubing that is anchored against torque reaction. An improved debris catcher is part of the bottom hole assembly to capture cuttings from the milling. A thruster can be used to maintain weight on the mill during the milling. The coiled tubi

Milling in casing that is over 4½ inches is done with coiled tubing that is anchored against torque reaction. An improved debris catcher is part of the bottom hole assembly to capture cuttings from the milling. A thruster can be used to maintain weight on the mill during the milling. The coiled tubing supports a mud motor to drive the mill. Return fluid is separated from the cuttings and returned to the surface.

대표청구항 ▼

We claim: 1. A method for cutting objects downhole, comprising: running in a cutting apparatus connected to a downhole motor and an anchor on coiled tubing into a well; providing a debris catcher in fluid communication with said coiled tubing and an annular space around said coiled tubing during sa

We claim: 1. A method for cutting objects downhole, comprising: running in a cutting apparatus connected to a downhole motor and an anchor on coiled tubing into a well; providing a debris catcher in fluid communication with said coiled tubing and an annular space around said coiled tubing during said running in; setting the anchor; operating said motor to turn the cutting apparatus; cutting an object that obstructs the wellbore or cutting a wellbore tubular in two; catching debris generated by the cutting apparatus and moving in said annular space with said debris catcher. 2. The method of claim 1 , comprising: locating said debris catcher uphole of said downhole motor. 3. The method of claim 1, comprising: providing pressurized fluid through said debris catcher to said downhole motor. 4. The method of claim 1, comprising: providing a retractable flow diverter on an exterior of said debris catcher. 5. The method of claim 4, comprising: mounting said flow diverter to allow relative rotation with respect to said debris catcher. 6. The method of claim 5, comprising: providing a ramp to direct said flow diverter to span an annular space around said debris catcher; and biasing said flow diverter away from said ramp. 7. The method of claim 1, comprising: using pressurized fluid delivered to said debris catcher to create a reduced pressure zone within said debris catcher for drawing debris-laden fluid into said debris catcher. 8. The method of claim 7, comprising: moving said debris laden fluid past a screen; passing fluid through said screen; providing a catch volume below said screen for debris that did not pass through said screen. 9. The method of claim 1, comprising: moving fluid to operate said cutting apparatus through said debris catcher in an opposite direction than debris laden fluid entering said debris catcher. 10. The method of claim 1, comprising: setting said anchor by supplying pressure in said coiled tubing; and providing a thruster adjacent said cutting apparatus that is actuated by said pressure in said coiled tubing. 11. A method for cutting objects downhole, comprising: running in a cutting apparatus connected to a downhole motor and an anchor on coiled tubing into a well; providing a debris catcher on said coiled tubing during said running in; setting the anchor; operating said motor to turn the cutting apparatus; catching debris generated by the cutting apparatus with said debris catcher; providing a retractable flow diverter on an exterior of said debris catcher; using pressurized fluid delivered to said debris catcher to actuate said flow diverter to close an annular space around said debris catcher. 12. A debris catcher for downhole use, comprising: a body having a first passage to conduct pressurized fluid therethrough and a second passage to accept debris; a flow diverter selectively radially extendable from said body after delivery downhole to impede flow in an annular space around said body to direct debris into said second passage, said diverter during delivery retracted to said body and out of said annular space, said passages remaining open whether said diverter is retracted or extended. 13. The debris catcher of claim 12, further comprising: a tool string adapted to extend into a wellbore and a hydraulically operated tool connected to said string, said body mounted to said string. 14. The debris catcher of claim 13, wherein: said body is mounted further up the wellbore than said tool. 15. The debris catcher of claim 13, wherein: said body is mounted further down the wellbore than said tool. 16. A debris catcher for downhole use, comprising: a body having a first passage to conduct pressurized fluid therethrough and a second passage to accept debris; a flow diverter selectively radially extendable from said body after delivery downhole to impede flow in an annular space around said body to direct debris into said second passage, said diverter during delivery retracted to said body and out of said annular space; a nozzle that uses fluid from said first passage to induce debris to enter said second passage. 17. The debris catcher of claim 16, further comprising: an inlet opening to said second passage, said nozzle directing fluid across said opening to move debris away from said inlet opening. 18. The debris catcher of claim 16, further comprising: a screen, having a bottom and mounted within said second passage creating an annular flowpath around it while debris is retained in said second passage in a space located below the bottom of said screen as fluid passes through said screen. 19. The debris catcher of claim 16, further comprising: said second passage is nested within said first passage; said first passage comprises a restriction to create pressure buildup that is directed to said nozzle. 20. A debris catcher for downhole use, comprising: a body having a first passage to conduct pumped fluid therethrough and a discrete second passage to accept debris; a venturi nozzle that uses pumped fluid from said first passage to reduce pressure and thereby induce fluid laden with debris to enter said second passage at a distance from a screen and thereafter push said fluid laden with debris from behind, said fluid laden with debris moving through said second passage in said body toward said screen and in a direction opposite from pumped fluid movement in said first passage, whereupon said debris remains in said second passage and said fluid exits said second passage. 21. The debris catcher of claim 20, further comprising: an inlet opening to said second passage, said venturi nozzle directing fluid across said opening to move debris away from said inlet opening. 22. The debris catcher of claim 20, further comprising: said screen having a bottom and mounted within said second passage creating an annular flowpath around it while debris is retained in said second passage in a space located below the bottom of said screen as fluid passes through said screen. 23. The debris catcher of claim 22, further comprising: a flow diverter mounted to said body to impede flow in an annular space around said body to direct debris into said second passage. 24. The debris catcher of claim 20, further comprising: said second passage is nested within said first passage; said first passage comprises a restriction to create pressure buildup that is directed to said venturi nozzle.