Cable deployed downhole tubular cleanout system

Abstract

Embodiments of the present invention generally relate to cable deployed downhole tubular clean out system. In one embodiment, a method of cleaning a tubular string disposed in a wellbore includes connecting a cable to a BHA. The BHA includes a motor and a cleaner. The method further includes supplying a power signal to the BHA through the cable, thereby operating the motor to rotate the cleaner; deploying the BHA into the tubular string and the wellbore using the cable; and cleaning a deposit from an inner surface of the tubular string using the rotating cleaner.

1 . A method of cleaning a tubular string disposed in a wellbore, comprising:
 connecting a cable to a BHA, the BHA comprising a motor and a cleaner;   supplying a power signal to the BHA through the cable, thereby operating the motor to rotate the cleaner;   deploying the BHA into the tubular string and the wellbore using the cable; and   cleaning a deposit from an inner surface of the tubular string using the rotating cleaner.   
     
     
         2 . The method of  claim 1 , wherein:
 the wellbore is live,   tubular string is a production string, and   the BHA is deployed also using a lubricator.   
     
     
         3 . The method of  claim 1 , wherein:
 the BHA further comprises an anti-rotation guide and a tractor, and   the motor also operates the tractor to propel the BHA along the tubular string.   
     
     
         4 . The method of  claim 1 , wherein the cleaner comprises a first set of brushes disposed therearound and a first set of scrapers disposed therearound. 
     
     
         5 . The method of  claim 4 , wherein:
 the cleaner further comprises a second set of brushes and a second set of scrapers,   the BHA further comprises:
 a first speed reducer operable to rotate the first sets at a first speed substantially less than a rotational speed of the drive shaft; and 
 a second speed reducer operable to counter-rotate the second sets relative to the drive shaft and the first sets at the first speed. 
   
     
     
         6 . The method of  claim 1 , wherein:
 the power signal is DC, and   the BHA further comprises a power conversion module operable to receive the power signal and supply a second power signal to the motor.   
     
     
         7 . The method of  claim 1 , further comprising swabbing the tubular string using the BHA after cleaning. 
     
     
         8 . The method of  claim 7 , wherein:
 a first length of the tubular string is cleaned, and   the method further comprises:
 swabbing the first length of the production tubing after cleaning the first length; and 
 cleaning a second length of the production tubing after swabbing the first length. 
   
     
     
         9 . The method of  claim 1 , further comprising spraying the cleaner with a fluid. 
     
     
         10 . The method of  claim 9 , wherein the fluid is injected through the cable to the BHA. 
     
     
         11 . The method of  claim 9 , wherein:
 the BHA is connected to a coiled tubing string, and   the fluid is injected through an annulus formed between the cable and the coiled tubing to the BHA.   
     
     
         12 . A bottom hole assembly (BHA) for cleaning a tubular string disposed in a wellbore, comprising:
 a cablehead;   a drive shaft;   a submersible electric motor operable to rotate the drive shaft;   a cleaner rotationally connected to the drive shaft;   an anti-rotation guide operable to engage the tubular string and connected to a housing of the motor;   a tractor rotationally connected to the drive shaft and operable to propel the BHA along the tubular string; and   a power conversion module operable to receive a DC power signal from the cablehead and supply a second power signal to the motor.   
     
     
         13 . The BHA of  claim 12 , wherein the tractor comprises a polymer screw operable to engage an inner surface of the tubular string. 
     
     
         14 . The BHA of  claim 12 , wherein the cleaner comprises a first set of brushes disposed therearound and a first set of scrapers disposed therearound 
     
     
         15 . The BHA of  claim 14 , wherein:
 the cleaner further comprises a second set of brushes and a second set of scrapers,   the BHA further comprises:
 a first speed reducer operable to rotate the first sets at a first speed substantially less than a rotational speed of the drive shaft; and 
 a second speed reducer operable to counter-rotate the second sets relative to the drive shaft and the first sets at the first speed. 
   
     
     
         16 . The BHA of  claim 15 , further comprising a third speed reducer operable to rotate the tractor at a second speed substantially less than the first speed. 
     
     
         17 . The BHA of  claim 12 , wherein:
 the drive shaft has a bore, and   the BHA further comprises:
 a hydraulic swivel in fluid communication with the bore, and 
 an injector in fluid communication with the bore and operable to spray the cleaner with a fluid. 
   
     
     
         18 . The BHA of  claim 17 , further comprising:
 a coiled tubing head; and   a fluid conduit in communication with the coiled tubing head and the hydraulic swivel.   
     
     
         19 . A downhole assembly, comprising:
 the BHA of  12 ; and   a cable having two or less conductors and a strength sufficient to support the BHA.   
     
     
         20 . The downhole assembly of  claim 19 , wherein the cable has a fluid conduit.