Downhole smart completion multi-access tools for acid stimulation

Abstract

A downhole access tool for accessing a lateral branch of a wellbore includes a tool body, a sliding sleeve, and a deflector device including a deflector plate and a deflector actuator operatively coupled to the deflector plate. A central conduit extends axially through the downhole access tool. The sliding sleeve is slidable relative to the tool body in an axial direction between a closed position and an open position. In the closed position, the sliding sleeve restricts access through the opening. In the open position, the sliding sleeve permits access through the opening. The deflector actuator transitions the deflector plate between a deflection position and a passthrough position. In the deflection position, the deflector plate deflects tooling radially outward towards the opening. In the passthrough position, the deflector plate allows access axially through the central conduit.

1 . A downhole access tool for providing access to a lateral branch of a wellbore, the downhole access tool comprising:
 a tool body comprising a cylindrical wall having an opening extending radially through the cylindrical wall;   a sliding sleeve disposed within the tool body; and   a deflector device comprising a deflector plate coupled to the tool body, the sliding sleeve, or both and a deflector actuator operatively coupled to the deflector plate,   where:
 the sliding sleeve, the tool body, or both define a central conduit extending axially through the downhole access tool; 
 the sliding sleeve is slidable relative to the tool body in an axial direction between a closed position and an open position; 
 in the closed position, the sliding sleeve restricts access through the opening in the tool body and, in the open position, the sliding sleeve permits access through the opening in the tool body; 
 the deflector plate is curved, such that a deflector surface of the deflector plate mirrors a contour of the cylindrical wall; 
 the deflector actuator is operable to transition the deflector plate between a deflection position and a passthrough position; 
 in the deflection position, the deflector plate restricts access axially through the central conduit and deflects tooling radially outward towards the opening in the tool body and, in the passthrough position, the deflector plate allows access axially through the central conduit. 
   
     
     
         2 . The downhole access tool of  claim 1 , where:
 in the deflection position, a deflecting surface of the deflector plate intersects a center axis of the downhole access tool and forms an angle greater than zero with the center axis; and   in the passthrough position, the deflecting surface of the deflector plate does not intersect the center axis.   
     
     
         3 . The downhole access tool of  claim 2 , where, in the passthrough position, the deflecting surface of the deflector plate is parallel to the center axis of the downhole access tool. 
     
     
         4 . The downhole access tool of  claim 1 , where, in the passthrough position, the sliding sleeve restricts movement of the deflector plate from the passthrough position to the deflection position. 
     
     
         5 . The downhole access tool of  claim 1 , further comprising a sliding sleeve actuator operatively coupled to the sliding sleeve, the sliding sleeve actuator operable to translate the sliding sleeve axially between the open position and the closed position. 
     
     
         6 . The downhole access tool of  claim 5 , further comprising:
 a hydraulic control line operatively coupled to at least one of the sliding sleeve actuator and the deflector actuator, where the hydraulic control line is operable to actuate at least one of the sliding sleeve actuator and the deflector actuator.   
     
     
         7 . The downhole access tool of  claim 6 , where an increase in a pressure in the hydraulic control line actuates both the sliding sleeve actuator and the deflector actuator, moving the sliding sleeve to the open position and the deflector plate to the deflection position. 
     
     
         8 . The downhole access tool of  claim 1 , where the deflector plate is coupled to the tool body or the sliding sleeve at a pivot point and the deflector actuator is operable to rotate the deflector plate about the pivot point to translate the deflector plate between the deflection position and the passthrough position. 
     
     
         9 . The downhole access tool of  claim 1 , where:
 the deflector plate is pivotally coupled to the cylindrical wall;   the cylindrical wall comprises a recess formed therein; and   the deflector plate is positioned within the recess when in the passthrough position.   
     
     
         10 . The downhole access tool of  claim 9 , where the sliding sleeve extends over the deflector plate, such that an outer surface of the sliding sleeve restricts movement of the deflector plate from the passthrough position to the deflection position. 
     
     
         11 . (canceled) 
     
     
         12 . The downhole access tool of  claim 1 , further comprising a processor communicatively coupled to the deflector actuator, a memory module communicatively coupled to the processor, and computer-readable executable instructions that, when executed by the processor, cause the downhole access tool to automatically:
 receive a divert signal indicative of transitioning the downhole access tool into a diversion state;   transition the sliding sleeve to the open position to provide access to the opening in the tool body; and   operate the deflector actuator to transition the deflector plate into the deflection position.   
     
     
         13 . The downhole access tool of  claim 12 , further comprising computer-readable executable instructions that, when executed by the processor, cause the downhole access tool to automatically:
 receive a passthrough signal indicative of transitioning the downhole access tool into a passthrough state;   transition the sliding sleeve to the closed position to restrict access to the opening in the tool body; and   operate the deflector actuator to transition the deflector plate into the passthrough position.   
     
     
         14 . The downhole access tool of  claim 1 , further comprising a biasing mechanism that biases the sliding sleeve from one of the closed position and the open position to the other of the closed position and the open position. 
     
     
         15 . The downhole access tool of  claim 14 , where:
 the cylindrical wall comprises a tab extending radially inward from the cylindrical wall; and   the biasing mechanism comprises a spring in contact with the sliding sleeve and the tab of the cylindrical wall.   
     
     
         16 . A method for treating a subterranean formation, the method comprising:
 installing the downhole access tool of  claim 1  in a wellbore at a junction of a lateral branch with the wellbore, where the downhole access tool is oriented in the wellbore so that the opening in the tool body is aligned with the lateral branch;   transitioning the downhole access tool to a diversion state where the sliding sleeve is in the open position and the deflector plate is in the deflection position;   inserting a coiled tubing into the wellbore, where the deflector plate of the deflector device deflects the coiled tubing radially outward through the opening in the tool body and into the lateral branch; and   injecting a treatment fluid from the coiled tubing into the subterranean formation in fluid communication with the lateral branch.   
     
     
         17 . The method of  claim 16 , further comprising:
 ceasing injection of the treatment fluid;   removing the coiled tubing from the lateral branch; and   transitioning the downhole access tool to a passthrough state where the deflector plate is in the passthrough position and the sliding sleeve is in the closed position.   
     
     
         18 . The method of  claim 16 , where the treatment fluid comprises an acid composition and treating the subterranean formation comprises an acid treatment of the subterranean formation in fluid communication with the lateral branch. 
     
     
         19 . The method of  claim 16 , where the opening of the tool body is aligned with the lateral branch so that a radial line passing outward from a center axis of the downhole access tool through a centerpoint of the opening of the tool body is spaced apart from a centerpoint of an inlet of the lateral branch by a distance that is less than 30% of a diameter of the opening in the tool body.