| Tesco Corporation Patent applications |
| Patent application number | Title | Published |
|---|
| 20120031627 | Control Line Installation Unit - A tubing installer runs a string of tubing into a well while strapping a control line to the tubing string. The installer includes a base having a tubular connector extending downward for connection to an upper end of a blowout preventer. Hydraulic cylinders are mounted to and extend upward from the base. A support floor having support slips is mounted to the hydraulic cylinders at a fixed distance above the base. A traveling slip base containing traveling slips is mounted to upper ends of piston rods of the hydraulic cylinders. A pipe lifting assembly is supported by the base for lifting and positioning an additional joint of tubing to be added to the string of tubing. A pipe make-up mechanism is supported by the base for rotating the additional joint into threaded engagement with the string of tubing. A control line supply source for supplies control line to and alongside the string of tubing at a point between the base and the support floor. | 02-09-2012 |
| 20110203794 | Apparatus and Method for Cementing Liner - A method of cementing a liner in a well includes mounting a valve assembly that is biased in a closed position to a running tool assembly. The running tool assembly has a stinger inserted through the valve assembly, retaining the valve assembly in an open position. The stinger has a cement retainer releasably mounted to it. After lowering the running tool assembly into engagement with the liner string, the operator pumps a cement slurry through the stinger and the valve assembly. The operator then pumps the cement retainer down the liner string into latching engagement with a lower portion of the liner string. Afterward, the operator lifts the stinger from the valve assembly, causing the valve assembly to move to the closed position. The valve assembly blocks upward flow of fluid from the well conduit through the valve assembly in the event of leakage of the cement retainer. | 08-25-2011 |
| 20110192614 | Torque Transmitting Load Shoulder - A well drilling tool has a tubular member connected into a casing string that serves as a drill string. A load shoulder is located within the bore of the tubular member. The load shoulder has a torque transferring portion that extends from a lower terminus to an upper terminus. The load shoulder has an axial force transferring portion that faces upward. A bottom hole assembly is lowered through the casing string and lands on the load shoulder. The bottom hole assembly has a mating profile to the load shoulder so that it will be supported by the load shoulder and will receive torque transferred from the load shoulder. | 08-11-2011 |
| 20110114308 | Hydraulic Interlock System Between Casing Gripper and Spider - A system for deploying a string of pipe from a drilling rig into a well includes a spider for mounting on a rig floor and a pipe gripper attached to the top drive. A hydraulic safety circuit monitors hydraulic fluid pressure at an apply port of the gripper and prevents hydraulic fluid pressure from being directed to move the slips to the released position if hydraulic fluid pressure is not already present at the apply port of the gripper. The safety circuit also monitors hydraulic fluid pressure at the apply port of the spider and prevents release hydraulic fluid pressure from being directed to move the gripping members to the released position if apply hydraulic fluid pressure is not already present at the apply port of the spider. | 05-19-2011 |
| 20110061939 | Offshore Casing Drilling Method - A method of casing drilling a portion of an offshore well includes running a casing string with a drill bit assembly attached to it into a previously drilled portion of the well. Before the drill bit assembly reaches bottom, the operator attaches drill pipe to the casing string and lowers the casing string on the drill pipe. When the drill bit is at bottom, an upper end of the casing string should be below the blowout preventer. The operator then performs casing drilling by rotating the drill pipe. When at a desired depth for the casing string, the operator pulls the drill pipe from the well and lifts the casing string up until its upper end is at the rig floor. The operator then runs the casing string back into the well but using casing in this instance. The operator then cements the casing string. | 03-17-2011 |
| 20110056703 | Method of Drilling and Running Casing in Large Diameter Wellbore - A well is drilled and casing installed utilizing a casing drilling technique. A bottom hole assembly having a drill bit and a fluid diverter is secured to a string of drill pipe and installed within a casing string. Drilling fluid is pumped down the drill pipe string to cause the drill bit to rotate and drill the well while the fluid diverter is in a drilling mode position. At the total depth for the casing string, the operator moves the fluid diverter to a cementing position and pumps cement down the drill pipe and up the casing string annulus. After cementing, the operator moves the fluid diverter to a packer set position and again pumps drilling fluid down the drill string to set the packer. | 03-10-2011 |
| 20110048737 | Method of Preventing Dropped Casing String with Axial Load Sensor - A method of running casing into a well utilizes a load sensor to avoid dropping the casing string accidentally. The rig has a spider at the rig floor that suspends a casing string in the well when in a gripping position. A casing lifting mechanism will place a new joint of casing on the casing string suspended in the spider. The new joint of casing is rotated to make up with the casing string. After makeup, the casing lifting mechanism lifts the new joint of casing and the casing string. The operator releases the spider to allow the casing string to be lowered further into the well. Before releasing the spider, a load sensor will send a signal indicating that the casing lifting mechanism is supporting a minimum amount of weight. | 03-03-2011 |
| 20100314100 | Multi-Function Sub for Use With Casing Running String - A multi-function sub is connected between a top drive of a drilling rig and a casing gripper. The sub has telescoping upper and lower members that rotate with each other. A sleeve is mounted to one of the members. That sleeve is prevented from rotation with the upper and lower members by an anti-rotation device. A piston is located on the other member and reciprocally carried within the sleeve. An external pump is connected to the sleeve for supplying pressurized fluid into the sleeve to act against the piston. This fluid provides compensation for thread makeup when a new joint of casing is being secured to a string of casing. | 12-16-2010 |
| 20100300704 | Casing Stabbing Guide - A system for running a string of casing into a well utilizes a casing gripping assembly. The casing gripping assembly connects to a top drive and has radially movable gripping elements. A pair of links have upper ends pivotally connected to the casing gripping assembly. A casing elevator is mounted below the casing gripping assembly to lower ends of the links. A guide is mounted to the links between the elevator and the casing gripping assembly. The guide has a vertically extending central opening that has a lower portion that defines a flared entrance to the opening. | 12-02-2010 |
| 20100282463 | Pump In Reverse Outliner Drilling System - A liner string for a well has a liner hanger assembly at an upper portion of the liner string. A profile sub is located at a bottom portion of the liner string. A bottom hole assembly is latched to the profile sub. The operator lowers the liner string into the well with a drill pipe string and rotates the drill pipe string to rotate the drill bit to deepen the well. At a selected depth, the operator releases the bottom hole assembly from the profile sub and reverse circulates drilling fluid from a liner annulus surrounding the liner string, pumping the bottom hole assembly up the liner string. When the bottom hole assembly reaches the lower end of the drill pipe string, it latches to a catcher tool located at the lower end of the drill pipe string. The operator moves the liner hanger assembly into setting engagement with the casing string, releases the drill pipe string from the liner string, and retrieves the drill pipe string along with the bottom hole assembly. | 11-11-2010 |
| 20100258354 | Jetted Underreamer Assembly - An underreamer for earth boring operations has a tubular body with a passage extending through it. Arms are pivotally mounted to the body and movable between retracted and extended positions. An actuator mandrel, located within the passage in the body, pushes the arms outward when drilling fluid is pumped downward in the drill string. Ports are located in the sidewall of the body and in the actuator mandrel. The ports align with each other when the mandrel moves to its downstream position. The ports divert a portion of the drilling fluid out to jet it across the cutting elements on the arms. The remaining portion of the drilling fluid passes downward to the drill bit and out nozzles of the drill bit. | 10-14-2010 |
| 20100224413 | Method of Selecting a Drilling Motor for a Casing Drill String - A method for selecting a drilling motor for rotating a drill bit relative to a drill string made up of casing accounts for a tendency for the casing to elongate as the internal pressure increases. The increase in pressure in the casing string increases the weight on the drill bit, the amount of which may be calculated based on the size and type of the string of casing. The ratio of bit torque over the weight on the bit may be assumed to be a constant number based on empirical measurements or a theoretical model. The increase in the weight on the drill bit can be expressed in terms of the bit torque versus the casing pressure, which is a linear slope. This linear slope may be compared to the delivery torque of candidate motors. | 09-09-2010 |
| 20100206580 | Tools and Methods Useful with Wellbore Reverse Circulation - A method for reverse circulating a tool upwardly through a wellbore, the method including: providing a manipulator tool including an upper end and a lower end, conveying the manipulator tool down hole to a position adjacent a downhole tool, using the manipulator tool to manipulate the downhole tool, and reversing fluid flow through the well to create a pressure differential about at least one of the manipulator tool and the downhole tool such that the at least one of the manipulator tool and the downhole tool is lifted upwardly through the wellbore. A manipulator tool for use in a reverse circulating method is also described as are a tool catcher, a tool catching assembly and a tool catching method. | 08-19-2010 |
| 20100193250 | Cutting Structure for Casing Drilling Underreamer - An underreamer earth-boring tool is connected to a bottom hole assembly for casing drilling applications. The underreamer has a tubular body with a longitudinal axis. Arms are pivotally mounted to the body and movable between retracted and extended positions. An array of cutting elements is mounted to each of the arms. Each of the arrays is swept back so that the cutting elements farther from the axis than others rotationally lag the others. | 08-05-2010 |
| 20100147517 | Pump Down Cement Retaining Device - A wall casing cement plug assembly includes a receptacle with an axial passage. The receptacle is pumped to a lower end of the casing string and locked in place. The receptacle has a casing seal that engages the string of casing and a retainer mechanism on its exterior that engages a profile in the string of casing. Cement is pumped through the receptacle by rupturing a blocking device in the axial passage of the receptacle. A wiper plug is pumped down the string casing. The wiper plug has a prong on its lower end that stabs into the axial passage of the receptacle. A latch located in the lower portion of the receptacle locks the wiper plug to the body. | 06-17-2010 |
| 20100132936 | Pipe Handling Device and Safety Mechanism - A pipe handling assembly includes: a pipe engaging apparatus including a pipe gripping mechanism connectable to a top drive such that the top drive transmits rotational movement and axial movement to the pipe gripping mechanism; a pipe handling device for mounting onto the pipe engaging apparatus, the pipe handling device including a link hanger mounted on the pipe engaging apparatus, a link arm having a first end pivotally connectable to the link hanger and an outboard end selected to carry a pipe into a position to be gripped by the pipe engaging apparatus; a bearing for isolating rotational movement to the pipe gripping mechanism from the link hanger; and a connection for rigidly connecting the link hanger to the pipe engaging apparatus during operation of the pipe handling assembly, the connection selected to substantially prevent the link hanger from rotating with the pipe gripping mechanism should the bearing seize. | 06-03-2010 |
| 20100126734 | Method and Apparatus for Retrieving and Installing a Drill Lock Assembly for Casing Drilling - A method of installing a drilling tool at a lower end of a string of casing suspended in a borehole employs a setting tool run by wireline. The setting tool is latched to a drilling tool connected a drill lock assembly. After landing in a profile sub at the lower end of the casing, fluid pressure is applied to the interior of the string of casing to actuate the setting tool. The setting tool moves to latch the drill lock assembly to the sub so that torque may be transmitted between the profile sub and the drill lock assembly. The setting tool movement also releases the setting tool from the drill lock assembly for retrieval. | 05-27-2010 |
| 20090242192 | Casing Stabbing Guide - A stabbing guide connects to a casing collar during makeup. The stabbing guide has a housing with a lower portion with a cylindrical interior and an upper portion with a conical interior. Upper and lower shoulders are located in the cylindrical interior, defining an annular recess between the shoulders. Each of the shoulders has an inner diameter smaller than an outer diameter of the casing collar. The housing is formed in separate segments and secured around the casing collar by a clamp. | 10-01-2009 |
| 20090151931 | Well String Centralizer and Method of Forming - Centralizers including at least a portion formed of a first material and at least one end band secured to the first material and formed of a second material. The end band being installed to resist detachment from the portion formed of the first material. | 06-18-2009 |
| 20090107675 | Liner Drilling and Cementing System Utilizing a Concentric Inner String - A method of drilling a well and installing a liner includes assembling concentric inner and outer strings of tubulars. A drill bit is located at the lower end of the inner string and a liner with a liner hanger makes up part of the outer string. The inner and outer strings may be rotated in unison to drill the well. At a selected depth, the operator sets the liner hanger and retrieves the inner string. The operator lowers a packer and a cement retainer on a string of conduit. The packer engages the liner hanger and the cement retainer is conveyed to the lower end of the liner. The cement retainer prevents cement in the outer annulus from flowing back up the string of conduit. The operator manipulates the conduit to set the packer. | 04-30-2009 |
| 20090101345 | Liner Drilling System with Retrievable Bottom Hole Assembly - A liner drilling system employs a bottom hole assembly that may be retrieved before reaching the total liner depth. The system includes an outer string made up of a liner and a profile nipple. An inner string including a running tool, drill pipe, and a drill lock tool are lowered into the outer string and rotationally and axially locked to the outer string. Drilling may be performed by rotating the inner string, which also rotates the outer string. The operator may retrieve the inner string by pulling the inner string and the liner upward until the upper end of the liner is located at the drilling rig floor. While supporting the liner at the drilling rig floor, the operator retrieves the inner string, then re-runs it back into the outer string. | 04-23-2009 |
| 20080230224 | Spear Type Blow Out Preventer - A blow out preventer for operating between a spear of a tubular gripping tool and a tubular gripped by the tool includes: an expandable seal carried on the spear and expandable to seal between the spear and the tubular's inner wall, the expandable seal being operable as a back up to a primary seal operable between the spear and the tubular's inner wall. A tubular gripping tool and a method may include the blow out preventer. | 09-25-2008 |
| 20080230216 | Wireline Entry Sub - A wireline entry sub includes a body having an upper end, a lower end and a longitudinal, center axis therebetween, the body adapted for use with a wellbore string of tubulars; a slot on the body open a depth from a body outer surface to at least the longitudinal center axis; a wireline entry port extending through the body from the slot to open adjacent the lower end; and a wireline pulling device on the sub body to apply pulling force to a wireline. | 09-25-2008 |
| 20080210439 | TUBULAR GRIPPING DEVICE - A tubular gripping device includes a mandrel including an upper end, a lower end and a long axis extending between through the upper end and the lower end; a threaded interval on an outer surface of the mandrel; and an annular force generating assembly carried on the mandrel and positioned between the upper end and the threaded interval adjacent the threaded interval and driveable to apply a load along the long axis toward the threaded interval. | 09-04-2008 |
| 20080196904 | WIRELINE ENTRY SUB - A wireline entry sub includes a body having an upper end, a lower end and a longitudinal, center axis therebetween, the body adapted for connection below a top drive to a wellbore string of tubulars; a slot on the body open a depth from a body outer surface to at least the longitudinal center axis; a wireline entry port extending through the body from the slot to open adjacent the lower end; and means for facilitating rig up of the wireline entry sub. | 08-21-2008 |
