JPS58127892A - Jack for winze pipe used while rotary table is left as it is - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Concerning equipment for key operation.

The dispatcher has installed a type of jack particularly suitable for lowering the casing dust ring into the wellbore, which is much heavier than the maximum load that can be lowered into the wellbore by the other rigs normally used. It is disclosed first.

These jacks include a piston and cylinder device that actuates two tube retainers in a relative vertical direction to lower the casing.

The invention provides a jack of this type that is designed to lower the casing without removing the rotary table used during drilling from the rig. During drilling and subsequent jacking operations, both the rotary table and a portion of the jacking jack preferably remain on the rig, and an upper extension is added to the assembly to use the assembly for jacking operations.

FIG. 1 shows a rig 10 having a derrick or mast 11, a rig floor l2 above the ground 13, and a 1# gauze structure containing a substructure 14 that supports the derrick, floor, and other equipment. ing. The conventional engine of the drawworks 15 operates line 16 to raise the mobile proc 17 against the crown block 181C attached to the Ili flsls of the derrick and by means of a conventional rotary table 211C to drill the wellbore 22. A drill string 19 driven about a vertical axis 20 is suspended and moved vertically. The rotary table 21 preferably has a rectangular horizontal cross section and includes a non-rotating body 23 supporting an inner portion 24, which is rotated by a shaft 20 via a chain 26 and a sprocket 27 by the Drawworks engine. A push assembly 123 in the central opening of the table section 24 pushes the engaged non-circular Kelly Hype forming the upper end of the drill string into the IO1 rotation. Includes master push and kelly push to make
Turn the bit at the bottom end of the string to drill the wellbore by turning Kelly Mother Eve.

After drilling the well, the casing 28 is moved to the jacking mechanism 2.
9 to be lowered into the well. This jacking mechanism is
two piston-cylinder arrangements #30 and 31, each consisting of a vertical cylinder having a bottom wall 37;
The piston 38 and the housing t, which move relative to each other along the vertical axis 39 or the axis 40 by the pressure fluid from 0 to 11414
0 C, on one side of axis 11120, parallel to axis 20, and equidistant from axis 20. At the lowest position of the piston 38, the upper surface 42 of the piston rod 41 is
in the horizontal plane 45 and the upper horizontal plane 43 of the cylinder 36
and is flush with the upper horizontal surface 44 of the beam 32 supported by the cylinder. From the ground, the cylinder 36
For example, it is supported by a base structure 46. beam 32
is uniform and supports the rotary table 2t, the casing gripping device 34, and the main pip string suspended by the casing stacking device and passing through the central opening 47 of the beam. Cylindrical openings 48 and 49 centered on axis m39 and axis @40 closely receive and position the upper end of the body 36 of the cylinder.

A ring 50 welded to the cylinder 36 has an upper truncated horizontal surface 51 that engages a horizontal lower surface 52 of the beam 32;
The horizontal plane supports the beam 32 and thereby the device supported on the ring via the cylinder 36 and pace 46. The ring 50 may be reinforced with elements 53 welded to the cylinder and to the ring. The beam 32 is held against lateral movement by brackets 54 which are secured to the beam at spaced intervals along the beam's two sides and which are attached to the rig. A bracket 56, which is solidly frozen, is attached to the member 57 of the '# group by a bolt 55.

The rotary table 2l is supported on the beam 32 between positioning lugs 58 that are in contact with the beam. During lowering of the casing, a gripping device 34 is supported on the rotary table and transmits the #r1%1 force of the casing from the gripping device via the rotary table beam 32 and the cylinder 36 to the ground. The holder #34 and the first retainer ff35 may each include an outer, rigid, general ring-shaped body 59 (FIG. S), which is centered on the axis 20;
The downwardly inclined slip receiver in which the circularly spaced wedge slins 7'61 engage has a surface 60, the slip 61 having an outer beveled surface 62 which is
When moving downwards, surfaces 6 (lj) engage to draw the slip inwardly. The inner gripping surface 63 of the slip has teeth for engaging and supporting the casing 28.

The slip is suspended by a ring 64 via a link 65 rotatably connected to the slip and ring. The ring and slip are moved to the lower gripping position (solid line in FIG. 3) and the slip to the casing by a piston and cylinder machine having a cylinder attached to the annular body 59 and a piston connected to the ring 64. It can be operated between the upper release position (break m) and no contact.

The upper piston extension 33 is connected to the studs 41 & 30 and 31 during the lowering operation of the casing, but is removed from these during drilling, and is supported by the piston 38 and extends through the central opening s68 and the upper horizontal surface 69. The upper horizontal surface 69 includes a top beam 67 with a lug 7o on the beam.
The gripping device #35 is supported at the position shown in FIG. One piston rod length part 71 is welded to the beam 67, and 111
It is decorated with a triangular element 72 extending downwardly along line 39 and axis 40 and welded to the connected parts. The lower cylindrical portion 73 of the piston rod extension 71 is
It fits snugly within the piston rod 41 and the pad-shaped horizontal N74 of the element or piston rod extension 71 is attached to the surface 42.
The support element 71° beam 67 and gripping device #35
is supported on the piston rod.

During drilling, the apparatus is in the state shown in FIGS. 1-3, and the cart of the rotary table is supported via the beam 32 and the cylinder 36. To drill the wellbore, the rotary table is all suspended by a traveling block,
Rotate the drill string and connected pit.

When adding pipe, the string can be suspended in slips from the rotating table. After drilling, the drill string is removed from the wellbore and the device 33 is replaced with piston red (
(FIG. 9) and connect the mountings f#34 and 35 to the rotary table and beam 67. Next, casing 2
8 is lowered into the wellbore by a jack mechanism. While the beam 67 and the gripping device I35 are actuated upwardly by the piston 38, the string is first suspended in the mounting #34, and subsequently the slip of the gripping device 35 grips the casing;
Meanwhile releasing the slip of the device 34 so that the casing is lowered deeper into the wellbore when moving the piston and beam 67 downward. When the piston reaches its lowest position (solid line in Figure 9), the gripping device @ 34 is actuated again to support the casing dust ring while the device 35
Release the slip and move the device upwards for another cycle.

A jacking mechanism may also be used to raise the casing, if desired.

The variant shown in FIGS. 6 and 7 is used when the casing is too heavy K to be supported via the rotary table, and the lower retainer @ 34 m rests on the beam 32a, and is supported by a rigid stand 75 straddling the rotary table 21a.
It is the same as that in FIGS. 1 to S. 1T of this stand
hl 76 engages the top surface 44a of beam 32m and supports horizontal apex 77. Lugs 78 on beam 32a engage legs 76 to position the stand. Portion 77 of the stand is provided for passing the casing 28a downwardly.
Beam 32a1 beam 67a, (opening 7 aligned with the openings of the rotating table and gripping device [34a, 35a)
It includes 9. The load 1 force is transmitted from the device 34- via the stand 75, the beam 32a and the cylinder 36m. The apparatus of FIGS. 6 and 7 is such that during the first part of the casing lowering operation, the mounting @ 34 a is supported directly on a rotary table as in FIG.
Until it reaches the point where it may damage the one-turn table.
Used without stand 75.

FIG. 5 shows the use of the device (for pulling out a dug-in pipe). For this purpose, the extension 33 is
The rotary table 21 is connected as shown in the flty diagram.
and a conventional tunnel elevator 80 on the beam 67.
and 81 are placed, and these elevators wrap around the scooping pipe 19, grip the well pipe, apply upward force to it, and/or engage with the enlarged connection #82 of the dug pipe section. K is formed to form an upwardly facing side acting upwardly on this. Place the elevator 81 around the bore just below one of the enlarged connections 82 and actuate the piston 38 to load the
33 upwards. As a result, beam 67 transmits its force upward to elevator 81 and exerts a large upward force on the drill string to unstick it.

[Brief explanation of the drawing]

FIG. 1 is a front view of the rig during drilling. 2 is a partial enlarged view showing the portion shown in FIG. 1, and FIG. 3 is a partial plan view taken along line 3--3 in FIG. Figure D is a partially enlarged view of the rig when the casing is lowered. FIG. S is a cross-sectional view at t-5m in FIG. 9. FIG. 6 shows the structure of all shapes. 7 is a horizontal cross-sectional view taken along line 7-7 in FIG. 6. FIG. FIG. 5 is a diagram illustrating the apparatus used to pull out stuck slits. 10... Rig, 19... Drill string, 20... Axis line, 21...
・Rotary table, 22... Well, 28...
...Casing, 29... Jacket mechanism,
30.31...Cylinder device, 34,3
5... device, 36... cylinder,
38... Piston, 50...
ring.

Claims (1)

[Scope of Claims] (111J) A rotary table positioned with a predetermined operational attachment of a framework structure and operated by power to rotate a drill string for drilling a wellbore; a string of casings to be lowered into the well, first and second tube holding devices operative to releasably support said casing; , said first
a wellbore drilling device comprising a fluid pressure actuated device having a piston and cylinder portion for vertically moving the second device relative to the device, wherein the tube holding device is actuated to lower the casing. While being
From said rotary table, the wellbore drilling equipment remains in the rig under both front piping retaining devices. (2) A support structure received under the rotary table and supporting the rotary table and a holding device thereon. It's wellbore drilling (L device. (31 drill string with pivot leg σ)
The wellbore is drilled with a rig that includes a rotary table that is powered to allow the machine to move, and then the jacking machine lowers the casing into the drilled well, and the jacking mechanism connects the two tube supports and The casing is inserted into the perforated well containing the piston and the cylinder device for moving one of the pipe holding devices in the F downward direction by intersecting one of the pipe holding devices with the other. In the lowering method, lowering the casing, the Mil@pi rotary table is left at 1 nog with p+lIn self-canal holding device σ) 1゛, and the !IId self casing is lowered through the rotary table by the holding device μ. Patent characterized by lowering