Integrated casing drive
a casing drive and integrated technology, applied in the direction of drilling rods, drilling accessories, earthwork drilling and mining, etc., can solve the problems of screwing into the casing, affecting the operation of the casing, and unable to rotate the casing string
Inactive Publication Date: 2018-01-18
WARRIOR RIG TECH LTD
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Benefits of technology
The present invention is an integrated casing drive (ICD) that allows for the rotation of casing or tubulars without screwing them into place. The ICD works in conjunction with a top drive and a rotary union to transfer energy to the pipe handler. It can be selectively locked onto the main shaft or quill of the top drive for simultaneous rotation. The ICD can be unlocked from the top drive frame and locked onto the main drive sprocket for rotating the pipe handler and its gripper. The locking mechanism includes a locking member and an actuator. The invention provides a more efficient and safe way to rotate casing or tubulars in well drilling operations.
Problems solved by technology
Conventional casing running operations can only make up a casing joint; there is no capability to rotate the casing string.
But it is a serious disadvantage to screw into the casing because the well owners do not want to risk any damage to the sensitive casing threads because it could compromise the integrity of the well.
The CRT's work reasonably well but have the following drawbacks:a) They are expensive to purchase or to hire.b) Although required only occasionally, they are not widely available as a service or rental.c) They are quite complex.d) They are separate tool to rig-up and commission.e) They need additional load path certification & periodic re-certification requirements.f) Heavy casing loads are transmitted through the TD's quill load path.
Rotary connections are susceptible to cyclic fatigue effects.iii.
Drillstem valves and subs with connections matching the drill pipe typically have to be removed for the casing operation because of hoisting capacity limitations.iv.
Rotary connections cannot carry significant bending loads so they are very sensitive to misalignment during the hoisting of heavy casing loads, while typically contributing to a very stiff load path with no alignment forgiveness.
Method used
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[0059]The integrated casing drive (herein also referred to as an “ICD”) according to one embodiment which is not intended to be limiting, cooperates with a top drive (TD) and includes a mode-shift mechanism (MSM) such as for example the ICD plate 10 of FIGS. 2-4. ICD plate 10 may, for example, cooperate in an intermediary position between top drive main sprocket 12 and stator 14. Stator 14 may, as illustrated, be a stator plate. The MSM shifts the ICD between the normal operating mode of the TD and its pipe handler 22, and an ICD mode.
[0060]The MSM includes locking members as herein broadly defined. In FIGS. 3 and 4 the locking members are a pair of locking pins 16 which selectively shuttle between raised and lowered positions. Pins 16 are shown lowered so as to lock ICD plate 10 to stator 14 (i.e. in normal TD operating mode). When raised, pins 16 lock into main sprocket 12 (i.e. into ICD mode).
[0061]In ICD mode, that is with ICD plate 10 locked to main sprocket 12, rotation of mai...
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Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 14 / 064,103 filed 25 Oct. 2013, which claims priority to U.S. provisional patent application No. 61 / 718,284 filed 25 Oct. 2012, entitled Integrated Casing Drive.FIELD OF THE INVENTION[0002]This invention relates to the field of top drives and in particular to a top drive accessory, referred to herein as an integrated casing drive, which may form part of a system which includes a top drive having a slewing pipe handler and tubular gripper.BACKGROUND OF THE INVENTION[0003]At least three top drive manufacturers and at least two third-parties offer a top drive accessory known as a Casing Running Tool (herein a CRT). CRT's attach, directly or indirectly, to the top drive quill and enable the top drive (hereinafter also referred to as a “TD”) to hoist, rotate and circulate casing without screwing into it, which is advantageous as explained below. A CRT grips and seals either ...
Claims
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IPC IPC(8): E21B19/16
CPCE21B19/16
InventorRICHARDSON, ALLAN STEWART
OwnerWARRIOR RIG TECH LTD