Abstract: A downhole tool and method for orienting a tool string within a passage, such as a wellbore or a tubular disposed in the wellbore. The downhole tool may be operable for detachably connecting with the tool string and orienting the tool string within the passage. The downhole tool may include a frame comprising a first frame portion and a second frame portion, wherein the first and second frame portions may be detachably connectable with each other around the tool string to detachably connect the frame with the tool string. The downhole tool may further include a first orienting feature rotatably connected with the first frame portion along a first axis of rotation and a second orienting feature rotatably connected with the second frame portion along a second axis of rotation. The first and second axes of rotation may be radially offset from a central axis of the tool string.

Abstract: A downhole tool for connecting with a conveyance line. The downhole tool includes a first body and a second body. The first body and second body are connected together, wherein the first body is operable to move with respect to the second body when a predetermined tension is applied to the line from a wellsite surface to cause the downhole tool to release the line. The first body and second body may be connected together via a plurality of pins, wherein the pins are configured to break when the predetermined tension is applied to the line from the wellsite surface to cause the downhole tool to release the line. The downhole tool may comprises a line end termination device operable to connect with the line. The line end termination device is operable to release the line when the predetermined tension is applied to the line from the wellsite surface.

Abstract: A downhole tool for connecting with a conveyance line. The downhole tool may include a body configured to receive the line and a fluid seal operable to seal against the line when the downhole tool is connected with the line to inhibit wellbore fluid from entering the body when the downhole tool is conveyed within a wellbore via the line. The downhole tool may include a fluid seal slidably disposed within the body and operable to seal against an inner surface of the body to inhibit wellbore fluid from entering the body when the downhole tool is conveyed within the wellbore. The body may include a first body and a second body connected together, wherein the first body is operable to move with respect to the second body when a predetermined tension is applied to the line from the wellsite surface to cause the downhole tool to release the line.

Abstract: A downhole release apparatus having a first connector sub connectable with a first portion of a tool string and a second connector sub connectable with a second portion of the tool string. The first connector sub may include a housing, a first latching member, and a blocking member. The second connector sub may include a second latching member. The first and second latching members may engage thereby connecting the first and second connector subs. The blocking member may be movable from a first position in which the blocking member prevents the first and second latching members from disengaging to a second position in which the blocking member permits the first and second latching members to disengage thereby permitting the first and second connector subs to disconnect. Relative movement between the housing and first latching member may facilitate movement of the blocking member from the first position to the second position.

Abstract: An apparatus and method for connecting and selectively disconnecting within a wellbore first and second portions of a downhole tool string from each other. The apparatus may be a downhole tool having a first connector sub connectable with the first portion of the downhole tool string, a second connector sub connectable with the second portion of the downhole tool string, an internal chamber, and a fastener connecting the first and second connector subs. At least a portion of the fastener fluidly separates the internal chamber into a first chamber portion and a second chamber portion. The first chamber portion is fluidly connected with the space external to the downhole tool. The downhole tool is selectively operable to disconnect the first and second connector subs from each other to disconnect the first and second portions of the downhole tool string from each other.

Abstract: Apparatus and methods for running casing into a wellbore. An apparatus may be or include a casing collar configured to couple together a first casing joint and a second casing joint. The casing collar may have a body and a plurality of rotatable members connected to the body. The body may have a fluid passage extending axially therethrough, a first coupler configured to couple the casing collar with the first casing joint, and a second coupler configured to couple the casing collar with the second casing joint. At least a portion of each rotatable member may extend from the body in a radially outward direction.

Abstract: A downhole centralizer operable to be coupled with a tool string and conveyed within a downhole passage, wherein the downhole passage is a wellbore or a tubular member disposed in the wellbore. The downhole centralizer may have a plurality of arms that are operable to move against a sidewall of the downhole passage to centralize at least a portion of the tool string within the downhole passage, impart an intended force against the sidewall of the downhole passage, and maintain the intended force substantially constant while the tool string is conveyed along the downhole passage and an inner diameter of the downhole passage changes.

Abstract: A downhole impact apparatus operable to impart an impact to an object within a wellbore. The impact apparatus may include a housing, a first chamber within the housing, a second chamber within the housing, and a piston assembly slidably disposed within the housing. The piston assembly may include a first piston slidably disposed within the first chamber and dividing the first chamber into a first volume and a second volume, a second piston slidably disposed within the second chamber, and a shaft connecting the first and second pistons. The first volume may be open to a space external to the housing and the second volume may be fluidly isolated from the space external to the housing. Relative movement between the piston assembly and the housing ends with the impact. The second chamber may be configured to contain a fluid to prevent relative movement between the piston assembly and the housing.