Abstract: A casing valve is described herein. The casing valve can include at least one wall forming a cavity and at least one flexible sleeve disposed proximate to an inner surface of the at least one wall. The casing valve can also include at least one chamber recessed relative to the inner surface of a top end of the at least one wall, where the at least one chamber is disposed between the at least one flexible sleeve and the at least one wall. The casing valve can further include at least one hydraulic channel disposed within the at least one wall and terminating in the at least one hydraulic chamber. The casing valve can also include a first coupling feature disposed at a top end of the at least one wall, wherein the first coupling feature is configured to couple to a first casing pipe.

Abstract: A method for pre-tensing sections of concentric tubulars in a wellbore. The method can include mechanically coupling an inside tubing pipe to an inside tubing string disposed in the wellbore. The method can also include mechanically coupling a second tubing to a second tubing string disposed in the wellbore. The method can further include suspending, by the first tubing, the first tubing, the first tubing string, the second tubing string, and the second tubing. The method can also include inserting, while suspending the first tubing, the first tubing string, the second tubing string, and the second tubing by the first tubing, a first slip into the first space between the first tubing and the second tubing. The method can further include inserting the first tubing, the first tubing string, the second tubing string, the second tubing, and the first slip further into the wellbore.

Abstract: A casing pipe assembly can include a first casing pipe having a top coupling member and a pipe curvature, where the top coupling member has first threads in a first direction, and where the pipe curvature substantially corresponds to a wellbore curvature. The casing pipe assembly can also include a second casing pipe having a bottom coupling member and substantially the same pipe curvature, where the bottom coupling member has second threads in a second direction. The casing pipe assembly can further include a coupling device having a bottom coupling member and a top coupling member, where the bottom coupling member has third threads in the first direction that threadably couple to the first threads of the first casing pipe, and where the top coupling member has fourth threads in the second direction that threadably couple to the second threads of the second casing pipe.

Abstract: A casing check valve for providing isolation of an open hole section of a wellbore from a cased hole section of the wellbore is described herein. The casing check valve can include a housing and an actuating sleeve movably disposed within the housing between an actuated position and a normal position. The housing can include a housing body, at least one actuating sleeve coupling feature, a flapper assembly, a flapper seat, and at least one casing pipe coupling feature. The actuating sleeve can include an actuating sleeve body, at least one housing coupling feature, at least one operating tool coupling feature, and a distal extension.

Abstract: A casing valve is described herein. The casing valve can include at least one wall forming a cavity and at least one flexible sleeve disposed proximate to an inner surface of the at least one wall. The casing valve can also include at least one chamber recessed relative to the inner surface of a top end of the at least one wall, where the at least one chamber is disposed between the at least one flexible sleeve and the at least one wall. The casing valve can further include at least one hydraulic channel disposed within the at least one wall and terminating in the at least one hydraulic chamber. The casing valve can also include a first coupling feature disposed at a top end of the at least one wall, wherein the first coupling feature is configured to couple to a first casing pipe.

Abstract: A method for pre-tensing sections of concentric tubulars in a wellbore. The method can include mechanically coupling an inside tubing pipe to an inside tubing string disposed in the wellbore. The method can also include mechanically coupling a second tubing to a second tubing string disposed in the wellbore. The method can further include suspending, by the first tubing, the first tubing, the first tubing string, the second tubing string, and the second tubing. The method can also include inserting, while suspending the first tubing, the first tubing string, the second tubing string, and the second tubing by the first tubing, a first slip into the first space between the first tubing and the second tubing. The method can further include inserting the first tubing, the first tubing string, the second tubing string, the second tubing, and the first slip further into the wellbore.

Abstract: A method for adjusting a pressure within a wellbore. The method can include inserting a first tubing into the wellbore. The method can also include mechanically coupling a bottom coupling feature of a multiple connection bushing to the first tubing. The method can further include mechanically coupling a second tubing to a first top coupling feature of the multiple connection bushing. The method can also include mechanically coupling a third tubing to a second top coupling feature of the multiple connection bushing, where the third tubing has an inner diameter that is greater than an outer diameter of the second tubing. The method can further include inserting the multiple connection bushing, the second tubing and the third tubing into the wellbore. The method can also include adjusting the pressure within a space between the second tubing, the third tubing, and the multiple connection bushing.

Abstract: A casing pipe assembly can include a first casing pipe having a top coupling member and a pipe curvature, where the top coupling member has first threads in a first direction, and where the pipe curvature substantially corresponds to a wellbore curvature. The casing pipe assembly can also include a second casing pipe having a bottom coupling member and substantially the same pipe curvature, where the bottom coupling member has second threads in a second direction. The casing pipe assembly can further include a coupling device having a bottom coupling member and a top coupling member, where the bottom coupling member has third threads in the first direction that threadably couple to the first threads of the first casing pipe, and where the top coupling member has fourth threads in the second direction that threadably couple to the second threads of the second casing pipe.

Abstract: An apparatus and process is disclosed for drilling a borehole into a subterranean formation with reverse circulation of drilling fluid. A tubular drill pipe extends into a subterranean formation. A bottom hole assembly connected to the drill pipe includes a drill bit for excavating the subterranean formation. A downhole motor is adapted for receiving electrical power from a cable extending into the subterranean formation. A downhole pump is powered by the motor and is configured for reverse circulating drilling fluid from the annular space surrounding the drill pipe to the interior space of the drill pipe. The drilling fluid is pumped upwards in the drill pipe by the downhole pump to carry excavated cuttings upwards through the interior space of the drill pipe.