System and Method for Drilling a Borehole

Abstract

A technique facilitates drilling in a wide variety of applications and environments. The technique utilizes a coiled tubing bottom hole assembly constructed with a sensor system that provides the ability to steer a borehole within a reservoir. An orienter is connected to a top end of the bottom hole assembly to provide rotational movement of the bottom hole assembly. The orienter can be designed to provide continuous and bidirectional rotational movement of the coiled tubing bottom hole assembly. A telemetry system is provided to enable high data rate telemetry between the orienter and a surface location as well as communication between the bottom hole assembly and the orienter.

1 . A system for drilling a borehole, comprising:
 a bottom hole assembly having a directional drill bit, a motor to drive the drill bit, and a measurement while drilling system;   an orienter coupled to the bottom hole assembly and located above the bottom hole assembly, the orienter providing full rotational capability for the bottom hole assembly in clockwise and counterclockwise directions;   a coiled tubing coupled to the orienter with a coiled tubing wireline head; and   a wireline to deliver power to the orienter, the wireline further providing high data rate telemetry between the bottom hole assembly and a surface location.   
   
   
       2 . The system as recited in  claim 1 , further comprising a wireless telemetry system to communicate signals between the bottom hole assembly and the orienter. 
   
   
       3 . The system as recited in  claim 2 , wherein the wireless telemetry system comprises a rotating communication component on the bottom hole assembly and a stationary communication component on the orienter. 
   
   
       4 . The system as recited in  claim 1 , wherein the bottom hole assembly further comprises a logging while drilling system. 
   
   
       5 . The system as recited in  claim 4 , wherein the logging while drilling system comprises an imaging sensor to enable geological steering of the borehole within a reservoir. 
   
   
       6 . The system as recited in  claim 4 , wherein the logging while drilling system comprises an azimuthal sensor to enable geological steering of the borehole within a reservoir. 
   
   
       7 . The system as recited in  claim 4 , wherein the logging while drilling system comprises a directional sensor to enable geological steering of the borehole within a reservoir. 
   
   
       8 . The system as recited in  claim 1 , wherein the measurement while drilling system comprises direction and inclination sensors. 
   
   
       9 . The system as recited in  claim 1 , wherein the orienter comprises a motor coupled to a gearbox, the motor receiving power through the wireline. 
   
   
       10 . The system as recited in  claim 9 , wherein the orienter further comprises an internal pressure sensor and an annular pressure sensor. 
   
   
       11 . The system as recited in  claim 1 , further comprising an axial device to facilitate axial movement of the bottom hole assembly. 
   
   
       12 . The system as recited in  claim 11 , wherein the axial device comprises a tractor. 
   
   
       13 . A method, comprising:
 constructing a coiled tubing bottom hole assembly with sensors to enable precise geological steering during drilling of a borehole;   connecting an orienter to the coiled tubing bottom hole assembly at a top end of the coiled tubing bottom hole assembly;   providing a high-bandwidth telemetry between the coiled tubing bottom hole assembly and the orienter; and   employing a wireline to provide high data rate telemetry and to deliver power to the orienter.   
   
   
       14 . The method as recited in  claim 13 , wherein constructing comprises constructing the coiled tubing bottom hole assembly with sensors able to scan the borehole. 
   
   
       15 . The method as recited in  claim 13 , wherein constructing comprises constructing the coiled tubing bottom hole assembly with a sensor system able to acquire and interpret azimuthal measurements and images in real time. 
   
   
       16 . The method as recited in  claim 13 , wherein constructing comprises constructing the coiled tubing bottom hole assembly with a measurement while drilling system. 
   
   
       17 . The method as recited in  claim 13 , wherein constructing comprises constructing the coiled tubing bottom hole assembly with a logging while drilling system. 
   
   
       18 . The method as recited in  claim 13 , further comprising operating the coiled tubing bottom hole assembly to drill a borehole. 
   
   
       19 . The method as recited in  claim 18 , wherein operating comprises steering the coiled tubing bottom hole assembly through a short radius drill trajectory. 
   
   
       20 . The method as recited in  claim 18 , wherein operating comprises utilizing the precise geological steering while operating in high gas fraction, two-phase drilling fluids. 
   
   
       21 . A system, comprising:
 a coiled tubing bottom hole assembly having a sensor system that provides the ability to geologically steer a borehole within a reservoir;   an orienter positioned above and connected to a top end of the coiled tubing bottom hole assembly, the orienter able to provide continuous and bidirectional rotational movement of the coiled tubing bottom hole assembly; and   a telemetry system able to provide high data rate telemetry between the coiled tubing bottom hole assembly and the orienter during operation.   
   
   
       22 . The system as recited in  claim 21 , further comprising a wireline coupled to the orienter to provide high data rate telemetry between the orienter and the surface while providing power to the orienter. 
   
   
       23 . The system as recited in  claim 21 , wherein the telemetry system is a wireless telemetry system. 
   
   
       24 . The system as recited in  claim 21 , wherein the sensor system is embodied at least in part in a measurement while drilling system. 
   
   
       25 . The system as recited in  claim 21 , wherein the sensor system is embodied at least in part in a logging while drilling system.