|Publication number||USRE29541 E|
|Application number||US 05/742,278|
|Publication date||Feb 21, 1978|
|Filing date||Nov 16, 1976|
|Priority date||Sep 30, 1974|
|Also published as||CA1025431A, CA1025431A1, DE2542432A1, DE2542432C2, US3949818|
|Publication number||05742278, 742278, US RE29541 E, US RE29541E, US-E-RE29541, USRE29541 E, USRE29541E|
|Inventors||Duane K. Russell|
|Original Assignee||Western Gear Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (14), Classifications (15), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
This invention pertains to hydraulic drilling rigs and to power swivels of the type allowing drill pipe to be passed therethrough.
2. Description of the Prior Art
Various types of hydraulic drilling rigs have been used heretofore, U.S. Pat. Nos. 3,722,607; 3,282,357; 2,502,895 and 3,158,213 are representative of some of these rigs. Most hydraulic drilling rigs have employed more than two rams or cylinders, arranged in an array which makes removal of the drill pipe difficult. The Schaffer patent, U.S. Pat. No. 2,502,895, employs a two-cylinder rig but the rig is not suitable for handling connected, multiple lengths of pipe, such as doubles or triples.
Heretofore, tripping long lengths of pipe has been a time-consuming, costly operation requiring removal of each section of pipe from below the drill stem assembly. Another approach is shown in the Ray patent, U.S. Pat. No. 3,722,607. This patent describes a through-the-power swivel drilling rig which uses slips for gripping the pipe while rotating the pipe. This type of connection to the pipe has not been well received in the industry.
It is an object of this invention to provide a hydraulic drilling rig employing only two hydraulic rams or cylinders.
It is an object of this invention to provide a hydraulic drilling rig which is readily accessible for changing drill pipe.
These objects are best obtained by providing a pair of hydraulic rams, the rod ends of which mount a tension structure that supports a power swivel centered between the rams. The rams are rigidly connected to a lateral support, leaving open access on one side of the support for changing drill pipe.
It is another object of the invention to provide a power swivel with a removable drill stem assembly for tripping pipe through the power swivel.
The power swivel is of the type which uses a drill stem assembly for threadably connecting to a pipe during drilling and reworking operations. The drill stem assembly can be removed from the drive assembly of the power swivel and replaced by an entry guide, allowing clear passage for passing pipe during tripping operations.
FIG. 1 is an isometric of a hydraulic oil derrick embodying the principles of the invention and with a portion of the support structure in a stowed condition.
FIG. 1A is a schematic section looking in the direction of the arrows 1A and FIG. 1.
FIG. 2 is an isometric of the oil derrick in an extended position.
FIG. 3 is an isometric of the power swivel, with parts broken away for clarity.
FIG. 4 is another isometric of the power swivel, with parts broken away for clarity and showing an entry guide substituted for the drill stem assembly of FIG. 3.
As best shown in FIG. 1, the hydraulic rig includes a base 10 mounted on skids 12 for movement in one direction. The skids are, in turn, mounted on a platform 13 which is movable on skids 14 for movement of the derrick in another direction. These movements allow accurate positioning or the derrick over the hole of an existing well for reworking or the like.
The drilling rig also includes a set of cylinder or ram stands 16. A pair of hydraulic rams 18 are removably connected to the stands 16 in any conventional manner, but preferably in the manner described in my copending application, entitled "Multiple-Passage, Quick-Disconnect Coupling," filed concurrently herewith. Preferably, the hydraulic connection between the cylinders and the hydraulic source 18 is through the stands 16; however, conventional hydraulic connections or those similar to that shown in the Bunn patent, U.S. Pat. No. 3,282,352, may be used.
Each cylinder or ram 18 is provided with a body or rod 20. The rods 20 are coupled at their upper ends to a horizontal cross brace 22 which forms a part of a tension structure 24. The tension structure is provided with elongated arms 26 which connect with a power swivel 28.
Lateral support for the hydraulic rams 18 is provided by a main support 30, rectangular in cross-section and having side beams for connecting to the upper ends of the rams and truss members 34 for connecting along the length of the cylinders. The main support 30 is also provided with an extendible support 30a, which is raised initially by the rams 18 and pinned in place during operations of the rig. The cross brace 22 is provided with opposed V-rollers 31a which ride on tracks 31b extending lengthwise on the extendible support. As is best shown in FIG. 1A, the support 30 provides a rigid, lateral support structure for the hydraulic cylinders and tensioning structure but leaves an open forward access 33 for removing and placing drill pipe relative to the power swivel.
Mounted on the ends of the side beams 32 is a conventional pipe storing rack 35 which overlies a set-back area of conventional design. Pipe sections P, preferably doubles, that is, two sections of standard size pipe coupled together, can be stored in the storage rack using the principles of this invention.
On the base 10 of the drilling rig, a conventional power tong 38 is positioned, along with conventional power slips 39. Of course, other necessary wellhead equipment, such as blowout preventers and the like, is also provided, if desired, in a conventional manner.
Mounted on top of the extendible support 30a is a sheave 41 of a conventional auxiliary hoist 42 which uses a conventional single-joint-type elevator.
The power swivel 28 (FIG. 3) includes a swivel stem assembly 50 having an auxiliary housing 51 joined by wedges 52 to a main housing 53 of a rotary drive assembly 54. A lower housing 56, forming part of a slip-type elevator 57, is bolted to the bottom of the main housing. The opposite sides of the main housing are provided with guide rollers 59 that ride on tracks 60 secured to the rams 18.
The swivel stem assembly 50 includes a hollow shaft 62 having a threaded stem or pin 63. The opposite end of the hollow shaft is threadably connected to a conventional rotary sealing box 68 that surrounds a stationary wash pipe 64. The pipe 64 is joined to a hose coupling 66 for drilling fluid.
The rotary drive assembly 54 includes four hydraulic motors 70 driving a ring gear 72 that is joined to an elongated, splined shaft 73. The splined shaft forms a central hollow core 76 which receives the hollow shaft 62. The hollow shaft has vertically shortened splines 75 which allow the shaft to move vertically a limited distance relative to the splines on the shaft 73. The vertical movement allows the stem 63 to be moved up and down when threading or unthreading the drill pipe onto or off of the stem.
FIG. 4 shows the same power swivel, with the swivel stem assembly 50 removed and, in its place, an entry guide 80 installed. The guide 80 has a flange 81 which can receive the wedges 52 for locking the entry guide on the housing 53. The hollow core of the rotary drive assembly 54 is of sufficient diameter, with the swivel stem assembly removed, to allow pipe P, including collars or interconnection between sections of the pipe, to pass through the center of the power swivel.
The elevators 57 include slips 84 which are coupled by a linkage 86 to a pneumatic cylinder 87. The slips can be closed on the pipe, as in FIG. 4, or opened, as in FIG. 3.
The drill string is normally suspended from the stem, with the force being transmitted through the shoulder of the underside of the spline 75 to the rotary drive assembly as at A and thus to the tension structure 26. In this condition, the slips 84 will be open and the pipe rotated by the motors 70. To add additional lengths of pipe, the pipe, in single sections, is removed from a separate pipe storage rack by the auxiliary hoist, and, with the power swivel in its uppermost position, the pipe is lowered beneath the stem 63 and the power tongs 38 couple the section to the pipe in the ground. The stem 63 is then brought down and the motors 70 energized to thread the stem onto the pipe. When the pipe is down into the earth as far as it can go, the slips 39 are set and the hydraulic motors 70 are reversed, releasing the pipe from the stem. The power swivel is again raised to receive the next piece of pipe.
In an operation in which only a few pieces of pipe are to be removed, the reverse operation takes place.
When tripping an entire string of pipe, the drill stem assembly 50 is removed by manually knocking out the wedges 52. This is done with just the upper end of the pipe protruding above the power slips 39 and with the stem of the drill stem assembly first being unscrewed from the pipe. After the entry guide 80 is put in place and locked by the wedges 50, the slips 84 are lowered over the end of the pipe and closed on the pipe. The power slips 39 are released and the hydraulic rams energized to raise the power swivel vertically with the drill string. The cylinders have a stroke of approximately thirty-six feet, which is more than the length of the normal pipe section. After the top of the stroke is reached, the power slips 39 are again engaged on the pipe and the elevator slips 84 released so that the power swivel can be lowered down on the pipe. The pipe is again engaged by the elevator slips 84, and the second stroke of the cylinders allows a double pipe to be pulled from the earth. The pipe is manually connected to an elevator on the auxiliary hoist 42 by a workman on the racking platform 35. The power swivel is again lowered, the pipe joint is broken by the power tongs and the auxiliary hoist then lifts the pipe free of the power swivel and carries it over to the rack 35. This operation is repeated until the entire pipe is removed.
Thus, the invention advantageously provides for double stroking to remove double pipe sections. The power swivel allows for very rapid tripping, while still using the preferred conventional type of swivel stem assembly. Since the swivel does not have to be removed, a change-over operation for tripping can be very fast, taking a relatively few minutes. The hollow power swivel allows vertical removal of doubles or even triples without requiring movement of the power swivel away from the well center line. The power swivel can also be used with conventional drill rigs equipped with split traveling blocks and flapper-type elevators. The hollow core again allows tripping without removal of the swivel and provides faster tripping times than presently obtained with prior art systems. As with conventional power swivels, the rotary table and Kelly system may be entirely eliminated, if desired.
While the preferred embodiment of the invention has been illustrated and described, it should be understood that variations will be apparent to one skilled in the art without departing from the principles expressed herein. Accordingly, the invention is not to be limited to the specific embodiment described.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2174115 *||Sep 27, 1937||Sep 26, 1939||Phillips Petroleum Co||Tubing make-up device|
|US2998084 *||Jul 8, 1957||Aug 29, 1961||Joy Mfg Co||Fluid operable power device for well operations|
|US3005504 *||May 11, 1959||Oct 24, 1961||Gardner Denver Co||Drilling device|
|US3158213 *||Aug 26, 1960||Nov 24, 1964||Leyman Corp||Drill string suspension arrangement|
|US3282357 *||May 12, 1965||Nov 1, 1966||Bunn John R||Hydraulic derrick assembly|
|US3312294 *||Aug 4, 1964||Apr 4, 1967||Wilson Mfg||Pipe handling device|
|US3722607 *||Apr 8, 1971||Mar 27, 1973||Tenneco Oil Co||Method for drilling a well|
|US3766991 *||Apr 2, 1971||Oct 23, 1973||Brown Oil Tools||Electric power swivel and system for use in rotary well drilling|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5921336 *||Sep 16, 1997||Jul 13, 1999||Parker Drilling Company||Walking substructure device|
|US6513605 *||Nov 27, 2000||Feb 4, 2003||Bentec Gmbh Drilling And Oilfield System||Apparatus for handling pipes in drilling rigs|
|US6581525||May 9, 2001||Jun 24, 2003||Columbia Trailer Co., Inc.||Method and apparatus for transporting and steering a load|
|US7681674 *||Dec 5, 2008||Mar 23, 2010||Loadmaster Engineering, Inc.||System for positioning transportable and relocatable heavy equipment|
|US9068401 *||Aug 14, 2012||Jun 30, 2015||Mw Industries, Inc.||Workover rig with reinforced mast|
|US9096282 *||Jun 4, 2013||Aug 4, 2015||Entro Industries, Inc.||Rig with drawworks and hoisting device|
|US9463833||Apr 8, 2016||Oct 11, 2016||Entro Industries, Inc.||Alignment restoration device for load transporting apparatus|
|US9533723||Oct 31, 2014||Jan 3, 2017||Entro Industries, Inc.||Mounting structure with storable transport system|
|US20030196791 *||Feb 25, 2003||Oct 23, 2003||N-I Energy Development, Inc.||Tubular handling apparatus and method|
|US20090272540 *||Feb 12, 2009||Nov 5, 2009||Mary B. Dimmitt||Mobile hydraulic workover rig|
|US20110083840 *||Sep 8, 2010||Apr 14, 2011||Greg Wiedmer||Workover rig with reinforced mast|
|US20140158342 *||Jun 4, 2013||Jun 12, 2014||Shawn R. Smith||Rig with drawworks and hoisting device|
|CN103867117A *||Apr 2, 2014||Jun 18, 2014||武汉市天宝工程机械有限责任公司||Underneath type multifunctional large-torque drilling machine transmission device|
|CN103867117B *||Apr 2, 2014||Apr 6, 2016||武汉市天宝工程机械有限责任公司||下置式多功能大扭矩钻机传动装置|
|U.S. Classification||175/52, 166/377, 175/85, 173/164|
|International Classification||E21B3/02, E21B21/00, E21B19/16, E21B21/02, E21B17/05|
|Cooperative Classification||E21B3/02, E21B21/00, E21B21/02|
|European Classification||E21B21/02, E21B21/00, E21B3/02|
|Mar 6, 1987||AS||Assignment|
Owner name: WESTECH GEAR CORPORATION, 2600 EAST IMPERIAL HIGHW
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTERN GEAR CORPORORATION, A CORP. OF DE;REEL/FRAME:004875/0512
Effective date: 19861016