Coiled tubing conveyed electrical orienter

Abstract

A bottom hole assembly can include a cable head configured to connect the bottom hole assembly to a cable in a coiled tubing, an electrical orienter to rotate multiple sensor packages downhole, and multiple conductors extending between the cable head and the sensor packages via the electrical orienter. A method can include connecting a bottom hole assembly to a coiled tubing, the bottom hole assembly comprising an electrical orienter, a sensor package including ranging equipment, a fluid motor and a drill bit, deploying the coiled tubing and the bottom hole assembly into the well, activating the electrical orienter to rotate the ranging equipment, and then drilling an offset wellbore toward a target wellbore located using the ranging equipment. An electrical orienter can include an electric motor, a flow path extending completely longitudinally through the electrical orienter, and multiple conductors extending completely longitudinally through the electrical orienter.

What is claimed is: 
     
         1 . A bottom hole assembly for use with a subterranean well, the bottom hole assembly comprising:
 a cable head configured to connect the bottom hole assembly to a cable in a coiled tubing;   multiple sensor packages, each of the sensor packages being configured to measure respective parameters downhole;   an electrical orienter configured to rotate the sensor packages downhole; and   multiple conductors, each of the conductors extending between the cable head and the sensor packages via the electrical orienter.   
     
     
         2 . The bottom hole assembly of  claim 1 , in which the electrical orienter is connected uphole of the sensor packages. 
     
     
         3 . The bottom hole assembly of  claim 1 , in which the sensor packages comprise ranging equipment, and in which the electrical orienter is configured to rotate the ranging equipment. 
     
     
         4 . The bottom hole assembly of  claim 1 , in which the cable head comprises multiple pressure barriers that isolate an annular chamber, and in which the annular chamber contains a dielectric grease. 
     
     
         5 . The bottom hole assembly of  claim 4 , in which the annular chamber is formed between an outer housing and a flow tube in the outer housing. 
     
     
         6 . The bottom hole assembly of  claim 5 , in which the flow tube surrounds a flow path that extends through the cable head and the electrical orienter. 
     
     
         7 . The bottom hole assembly of  claim 1 , in which the electrical orienter comprises a torque weak point, the torque weak point being configured to fail at a predetermined torque output by a motor of the electrical orienter. 
     
     
         8 . The bottom hole assembly of  claim 1 , further comprising a check valve connected between the sensor packages and a fluid motor. 
     
     
         9 . The bottom hole assembly of  claim 8 , in which the check valve is configured to prevent fluid flow through a flow path from the fluid motor to the sensor packages. 
     
     
         10 . The bottom hole assembly of  claim 8 , in which the check valve consists essentially of non-magnetic material. 
     
     
         11 . The bottom hole assembly of  claim 1 , in which the electrical orienter comprises a motor having a conductive chassis, and a switch that selectively connects the chassis to electrical ground via one of the conductors. 
     
     
         12 . The bottom hole assembly of  claim 11 , in which the electrical orienter comprises an electronics package, and the electronics package is configured to selectively operate the switch based on an activation state of the sensor packages. 
     
     
         13 . The bottom hole assembly of  claim 12 , in which the electronics package is further configured to disconnect the motor chassis from electrical ground when at least one of the sensor packages is activated. 
     
     
         14 . A method for use in a subterranean well, the method comprising:
 connecting a bottom hole assembly to a coiled tubing, the bottom hole assembly comprising an electrical orienter, a sensor package including ranging equipment, a fluid motor and a drill bit;   deploying the coiled tubing and the bottom hole assembly into the well;   activating the electrical orienter to rotate the ranging equipment; and   then drilling an offset wellbore toward a target wellbore located using the ranging equipment.   
     
     
         15 . The method of  claim 14 , in which the drilling comprises flowing a fluid through a flow path extending through the electrical orienter, the sensor package, the fluid motor, and the drill bit. 
     
     
         16 . The method of  claim 14 , in which the electrical orienter comprises an electric motor, and further comprising disconnecting the electric motor from electrical ground. 
     
     
         17 . The method of  claim 16 , in which the disconnecting is performed in response to activating the sensor package. 
     
     
         18 . The method of  claim 16 , in which the disconnecting is performed in response to activating the ranging equipment. 
     
     
         19 . The method of  claim 14 , further comprising connecting a check valve between the fluid motor and the electrical orienter in the bottom hole assembly. 
     
     
         20 . The method of  claim 19 , in which the check valve consists essentially of non-magnetic material. 
     
     
         21 . The method of  claim 14 , in which the electrical orienter comprises a torque weak point, the torque weak point being configured to fail at a predetermined torque output by an electric motor of the electrical orienter. 
     
     
         22 . The method of  claim 14 , in which the activating and the drilling are performed in a single trip of the bottom hole assembly into the well. 
     
     
         23 . An electrical orienter for use in a subterranean well, the electrical orienter comprising:
 an electric motor configured to rotate a first section of the electrical orienter relative to a second section of the electrical orienter;   a flow path extending completely longitudinally through the electrical orienter; and   multiple conductors extending completely longitudinally through the electrical orienter.   
     
     
         24 . The electrical orienter of  claim 23 , in which all of the multiple conductors are isolated from an outer housing of the electrical orienter. 
     
     
         25 . The electrical orienter of  claim 23 , further comprising a switch connected between one of the conductors and a conductive chassis of the electric motor. 
     
     
         26 . The electrical orienter of  claim 25 , further comprising an electronics package configured to activate the switch to disconnect the motor chassis from the one of the conductors when a sensor package is activated. 
     
     
         27 . The electrical orienter of  claim 23 , further comprising a torque weak point configured to fail at a predetermined torque output by the electric motor.