KR101959829B1 - Continuous Circulation System - Google Patents

Abstract

Provided in the present invention is a continuous fluid circulation system. In the continuous fluid circulation system according to an embodiment of the present invention, a chamber assembly structure of a conventional continuous fluid circulation system is improved. Therefore, a pipe ram to support a drill pipe in a side direction is arranged to be orthogonal to each other in four directions such that deformation of the drill pipe may be minimized through uniform distribution of supporting force. Furthermore, position adjustment of a blind ram which needs to be operated while avoiding a tool joint portion of the drill pipe is conveniently and easily performed by a sliding control cylinder.

Description

{Continuous Circulation System}

More particularly, the present invention relates to a chamber assembly structure of a conventional continuous mixed circulation system, in which the pipe ram for orthogonally supporting the drill pipe is arranged orthogonally in four directions, To minimize the deformation of the drill pipe and to facilitate the positioning of the blind ram, which must be avoided from the tool joint portion of the drill pipe, through the sliding control cylinder .

A drilling rig for drilling holes in the ground to probe the underground resources of the seafloor or land or to investigate the structure / condition of the stratum is provided by a drilling fluid, such as drilling mud, Allow puncturing to be performed. In the process of connecting or disconnecting the drill pipe to the drilling device to install or replace the drill pipe, the mud is continuously injected to keep the inside and outside pressure of the drill string constant, to keep the cuttings moving so that they do not get stuck in the well.

Continuous circulation system (CCS) is a continuous circulation system in which the continuous driving of the mud pump is continuously performed throughout the drilling operation process including the connection / disconnection operation of the drill pipe, so that the mud is continuously circulated in the drilling apparatus. As a technique related to the continuous circulation system, Korean Registered Patent Publication No. 10-1832083 entitled " Sewage Water Circulation Regulation System and Sewage Water Circulation Regulation Method for Drilling of the Great Depth, "and European Patent No. EP 2232001" METHOD AND APPARATUS FOR FACILITATING Quot; CONTINUOUS CIRCULATION OF DRILLING MUD DURING CONSTRUCTION AND MAINTENANCE OF A WELL ".

The conventional continuous circulation system shown in FIG. 1 includes a chamber assembly 100, a rotary slip assembly 200, a snubbing device assembly 300, and a pipe guide assembly 400.

 The chamber assembly 100 has an interior space in which the mud can be received, wherein the drill pipe 500 passes vertically through the interior space of the chamber assembly 100. The chamber assembly 100 includes an upper pipe RAM unit 120 having four vertically arranged main cylinders 110, two upper pipe rams 121, a lower pipe RAM unit 120 having two lower pipe rams 131, A blind ram unit 140 having two blind rams 141, a lower mud valve 160a connected to the mud pump via a mud skid, and an upper mud valve 160b . As shown in FIG. 2, the connection and disconnection of the drill pipe 500 is performed inside the chamber assembly 100, and during the connection and disconnection operations of the drill pipe 500, through the lower mud valve 160a, The mud is continuously supplied to the drill pipe 500 which flows into the inner space of the assembly 100 and is disconnected from the stand pipe, so that the inner and outer pressures of the drill string are kept constant.

The rotary slip assembly 200 is disposed below the chamber assembly 100 and includes a plurality of slip pads 210 closely attached to the outer circumferential surface of the drill pipe 500 at the lower side of the chamber assembly 100, And is supported in the lateral direction.

The snubbing device assembly 300 is disposed above the chamber assembly 100 to induce connection and disengagement of the drill pipe 500. To this end, when the snubbing cap head is lowered by the snubbing cap cylinder, the pad connected to the pad connection casing is connected to the drill pipe 500, . Here, the pad is positioned inside the pad casing, and the pad casing is engaged with the main gear. The pad casing is located inside the pad connection casing, and three lugs are disposed on the inner side of the pad connection casing. The lugs connected to the pad are fixed in a pin type.

Also, in the snubbing device assembly 300, four hydraulic motors are fastened with a rotating gear, and four rotating gears and one main gear are meshed with each other. At the same time as the motor starts to rotate, the rotating gear rotates and the main gear rotates in the opposite direction to the rotating gear. At the same time, the pad casing is rotated, which causes the pad and pad connection casing to rotate and rotate the drill pipe.

On the other hand, the snug device assembly 300 allows the torque gear to be connected to the torque cylinder. The torque gear is installed in the torque gear casing, and the groove of the torque gear is protruded, And the torque gear casing is not released to the outside by the gear casing. The torque gear casing is moved by a torque gear casing cylinder. The torque gear casing cylinder advances, and the torque gear is caught by the gear of the main gear. Thereafter, the torque cylinder is operated, and the connection or disconnection operation of the drill pipe is completed. Then, the torque gear casing cylinder moves backward and the torque gear engaged with the main gear is released.

The pipe guide assembly 400 allows the stand pipe connected at the top drive to be positioned at the center line of the well bore where the drilling apparatus is disposed.

3, the upper and lower pipe RAM units 120 and 132 having the pipe ram bodies 122 and 132, in which the two pipe rams 121 and 131 are disposed, (130). Corresponding to this, a ram block, a top seal, and a front packer having right and left side faces forming an angle of 180 degrees are provided in the pipe ram bodies 122 and 132 as shown in FIGS. 4A to 4C . Here, since the conventional continuous circulation system has a structure in which the two pipe rams 121 and 131 are disposed to face each other, the force acts only in one direction, and the distribution of force is poor.

On the other hand, the blind ram must be operated from the tool joint part of the drill pipe. In the conventional continuous water circulation system, the positioning accuracy of the blind ram is lowered due to the positioning of the blind ram by the vertical main cylinder, There was a limitation in complicating the position adjustment.

Accordingly, there is a need to develop a technique capable of improving the disadvantages of the conventional continuous circulation system as described above.

Korean Registered Patent Publication No. 10-1832083 entitled " Sewage Water Circulation Regulation System and Sewage Water Circulation Regulation Method for Drilling of the Great Depth of Water " EP 2232001 "METHOD AND APPARATUS FOR FACILITATING CONTINUOUS CIRCULATION OF DRILLING MUD DURING CONSTRUCTION AND MAINTENANCE OF A WELL"

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the problems of the related art, and the upper pipe RAM unit and the lower pipe RAM unit constituting the chamber assembly of the continuous water circulation system are each composed of four pipe rams radially arranged at intervals of 90 degrees It is an object of the present invention to provide a new type of continuous water circulation system in which deformation of the drill pipe can be minimized by making uniform distribution of the supporting force.

The present invention also relates to a blind ram unit constituting a chamber assembly of a continuous water circulation system, which is connected to a vertically disposed sliding control cylinder to provide a vertically adjustable configuration so as to avoid the tool joint portion of the drill pipe Which is capable of easily and easily performing the adjustment of the position of the blind ram to be operated by the user.

In addition, the present invention allows a cylindrical roller bearing to be disposed between a pad connection casing and a snorking cap head constituting a snugging device assembly of a continuous water circulation system, so that the pad connection casing also smoothly and stably rotates when the main gear of the snug device assembly rotates. And to provide a new type of continuous water circulation system that allows the snubbing device assembly to perform its functions.

According to an aspect of the present invention for achieving the above-mentioned object, the present invention provides a chamber assembly including a chamber assembly having an inner space into which a mud can be received, the drill pipe passing vertically through the inner space; A plurality of slip pads 210 disposed below the chamber assembly 100 and closely contacting the outer circumferential surface of the drill pipe 500 under the chamber assembly 100 support the drill pipe 500 in the lateral direction A rotary slip assembly 200 is provided. A snubbing device assembly (300) disposed above the chamber assembly (100) to induce connection and disconnection of the drill pipe (500); And a controller for controlling operations of the chamber assembly 100, the rotary slip assembly 200, and the snubbing device assembly 300,

The upper and lower ends of the main plate 600 are fixed to a chamber plate 190 disposed on the upper side of the chamber assembly 100 to control the height of the chamber assembly 100 A plurality of vertically arranged main cylinders (110); An upper pipe RAM unit 120 and a lower pipe RAM unit 130 arranged vertically and supporting the drill pipe 500 in a lateral direction; And a blind RAM unit (140) disposed between the upper pipe RAM unit (120) and the lower pipe RAM unit (130) for vertically dividing the inner space,

Each of the upper pipe RAM unit 120 and the lower pipe RAM unit 130 includes four pipe rams 121 and 131 radially disposed at intervals of 90 ° around the drill pipe 500 Of the circulation system.

In the continuous recirculating water circulation system according to the present invention, each of the upper pipe RAM unit 120 and the lower pipe RAM unit 130 includes passages 1222 and 1322 through which the four pipe rams 121 and 131 pass And pipe ram bodies 122 and 132 formed radially in 90 ° intervals. The pipe ram bodies 122 and 132 have four ram blocks 1221 and 1321 arranged at intervals of 90 °, The ram blocks 1221 and 1321 have arc-shaped connecting members 1221a and 1321a, which form left and right connecting surfaces inclined at an angle of 45 °, .

The ram blocks 1221 and 1321 have seal mounting grooves 1221b and 1321b formed in a shape of arc along the rear line of the linking members 1221a and 1321a, ; And packer mounting grooves 1221c and 1321c formed between the pair of connectors 1221a and 1321a which are vertically spaced from each other at the front end portion,

 A top seal 1223 (1323) having an elliptical shape to be fitted into the seal mounting grooves 1221b and 1321b and having a tapered upper surface protruding from the upper surface of the ram blocks 1221 and 1321; The front packers 1221 and 1321 are formed in a shape of arc having left and right sides inclined at an angle of 45 degrees and inserted into the packer mounting grooves 1221c and 1321c so that a tapered front surface protrudes from the front of the ram blocks 1221 and 1321 1224 < / RTI >

The chamber assembly 100 is connected to the blind RAM unit 140 and vertically arranged to adjust the height of the blind RAM unit 140 so as to move the drill pipe 500, And a sliding control cylinder 180 for dividing the inner space of the blind RAM unit 140 into upper and lower parts in an area excluding the tool joint part of the blind ram unit 140. [

In the continuous circulation system according to the present invention, the snubbing device assembly 300 is bolted to the pad connection casing 310 and is inserted and fixed into a bearing mounting groove formed on the bottom surface of the snubbing cap head 320 And a cylindrical roller bearing 330 to rotate the pad connection casing 310 when the main gear of the snubbing device assembly 300 rotates.

According to the continuous water circulation system according to the present invention, the pipe ram for supporting the drill pipe is disposed in four directions so that even distribution of the support force is performed, thereby minimizing deformation of the drill pipe. Further, according to the continuous circulation system according to the present invention, the adjustment of the position of the blind ram to be operated by avoiding the tool joint portion of the drill pipe can be easily and easily performed through the sliding control cylinder. According to the continuous circulation system of the present invention, the pad connection casing also smoothly and stably rotates when the main gear of the snug device assembly rotates, so that the snug device assembly can smoothly perform its functions.

1 is an external view of a conventional continuous can circulation system;
2 is an operational flowchart of a conventional continuous mixed cycle system;
FIG. 3 is a view showing a configuration of a snug device assembly of a continuous mixed cycle system; FIG.
4 (a) is a view showing an arrangement structure of a pipe ram included in a chamber assembly of a conventional continuous mixed-circulation system;
FIG. 4 (b) is a view showing the shape of the pipe ram body provided in the chamber assembly of the conventional continuous mixed circulation system; FIG.
5 (a) to 5 (c) are diagrams showing components constituting a pipe ram body of a conventional continuous mixed cycle system;
6 and 7 are perspective views of a continuous mixed cycle system in accordance with an embodiment of the present invention;
8 is a view showing an arrangement structure of a pipe ram included in a chamber assembly of a continuous mixed-circulation system according to an embodiment of the present invention;
FIG. 9 is a view showing a shape of a pipe-ram body included in a chamber assembly of a continuous mixed-circulation system according to an embodiment of the present invention; FIG.
10 (a) to 10 (c) illustrate components constituting a pipe ram body included in a chamber assembly according to an embodiment of the present invention;
11 is a view illustrating a blind RAM unit of a chamber assembly according to an embodiment of the present invention;
12 is a view illustrating a height adjustment structure of a blind RAM unit of a chamber assembly according to an embodiment of the present invention;
13 is a view illustrating a bearing mounting configuration of a snubbing device assembly according to an embodiment of the present invention;
Figure 14 is an illustration of a cylindrical roller bearing used in a snubbing device assembly according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings 6 to 14. In the drawings and the detailed description, there is shown a general continuous circulation system, a chamber assembly / rotary slip assembly / snubbing device assembly / pipe guide assembly of a continuous mixed circulation system, a cylinder, a pipe ram, a ram block, The description and the operation of the structure and operation that the workers of the present invention can easily understand are omitted or simplified. In the drawings and specification, there are shown in the drawings and will not be described in detail, and only the technical features related to the present invention are shown or described only briefly. Respectively.

The continuous circulation system according to an embodiment of the present invention includes a chamber assembly 100, a rotary slip assembly 200, a snubbing device assembly 300, a pipe guide assembly 400, a controller .

The chamber assembly 100 has an internal space in which the mud can be received, such that the drill pipe 500 passes vertically through the internal space. The inner space of the chamber assembly 100 is formed by the lower chamber 150a and the upper chamber 150b and the lower mud valve 160a and the upper mud valve 160b are formed in the lower chamber 150a and the upper chamber 150b, Respectively.

The rotary slip assembly 200 is disposed below the chamber assembly 100 and includes a plurality of slip pads 210 closely attached to the outer circumferential surface of the drill pipe 500 at the lower side of the chamber assembly 100, And is supported in the lateral direction.

The snubbing device assembly 300 is disposed above the chamber assembly 100 to induce connection and disengagement of the drill pipe 500. The pipe guide assembly 400 allows the stand pipe connected at the top drive to be positioned at the center line of the well bore where the drilling apparatus is disposed.

The controller controls the operation of the chamber assembly 100, the rotary slip assembly 200, and the snubbing device assembly 300.

The chamber assembly 100 according to an embodiment of the present invention includes a plurality of vertically arranged main cylinders 110, an upper pipe RAM unit 120 and a lower pipe RAM unit 130, and a blind RAM unit 140 Lt; / RTI >

A plurality of vertically arranged main cylinders 110 are vertically fixed to a main plate 600 fixed to a mounting surface and a chamber plate 190 disposed above the chamber assembly 100 to control the height of the chamber assembly 100 do. The cylinder block of the vertically arranged main cylinder 110 is fixed to the sub plate 700 and the rod of the vertically arranged main cylinder 110 is fixed to the main plate 600.

The upper pipe RAM unit 120 and the lower pipe RAM unit 130 are horizontally spaced to support the drill pipe 500 in a lateral direction. The blind RAM unit 140 includes an upper pipe RAM unit 120, RAM unit 130 to divide the internal space vertically.

Particularly, each of the upper pipe RAM unit 120 and the lower pipe RAM unit 130 according to the embodiment of the present invention includes four pipes (not shown) radially disposed at intervals of 90 degrees around the drill pipe 500 as shown in FIG. 8, (121) (131). 9, each of the upper pipe RAM unit 120 and the lower pipe RAM unit 130 has passages 1222 and 1322 through which the four pipe rams 121 and 131 pass, And a pipe ram body 122 (132) formed radially.

The pipe ram bodies 122 and 132 have a structure in which four ram blocks 1221 and 1321 arranged at intervals of 90 degrees are engaged with each other. Here, the front end portion of the ram blocks 1221 and 1321 according to the embodiment of the present invention is formed of arc-shaped connecting bodies 1221a and 1321a whose connecting surfaces are inclined at an angle of 45 ° to the left and right sides. The ram blocks 1221 and 1321 according to the embodiment of the present invention may include a seal mounting groove 1221b formed in a arc shape along the rear line of the connectors 1221a and 1321a as shown in FIG. And a pair of connecting members 1221a and 1321a that are vertically spaced apart from each other at the front end portion. The ram blocks 1221 and 1321 according to the embodiment of the present invention are formed in an elliptical shape fitted to the seal mounting grooves 1221b and 1321b as shown in FIG. And a top seal 1223 and 1323 projecting from the upper surface of each of the packer mounting grooves 1221 and 1321 while having arc shapes having left and right side surfaces inclined at 45 °, And front packers 1224 and 1324 that are inserted and protrude from the front surfaces of the ram blocks 1221 and 1321 as shown in FIG. 10 (c). The sealing performance of the pipe ram bodies 122, 132 can be improved by the tapered structure of the top seal 1223 (1323) and the front packers 1224 (1324).

Meanwhile, the blind RAM unit 140 of the chamber assembly 100 according to the embodiment of the present invention is disposed so as to be movable up and down. Accordingly, the blind RAM unit 140 is configured such that the blind ram 141 is disposed The blind ram chamber 170 is additionally formed at the upper and lower portions of the pipe ram body so that the mud can be continuously circulated in the inner space of the chamber assembly without external leakage even if the blind ram 141 moves up and down. The blind ram chamber 170 is a structure for sliding the blind RAM unit 140 in the chamber and is connected to the lower chamber 150a and the upper chamber 150b to be movable up and down.

12, the sliding control cylinder 180 includes a blind RAM unit 140 and a lower pipe RAM unit 140. The blind RAM unit 140 includes a sliding control cylinder 180, The blind ram unit 140 is vertically disposed with the upper and lower ends thereof connected to each other so that the blind ram unit 140 can vertically divide the inner space in an area excluding the tool joint portion of the drill pipe 500 by adjusting the height of the blind ram unit 140 .

13, the snubbing device assembly 300 according to the embodiment of the present invention is bolted to the pad connection casing 310 and is inserted and fixed into a bearing mounting groove formed on the bottom surface of the snubbing cap head 320 The cylindrical roller bearing 330 shown in FIG. 14 is provided to smoothly and stably rotate the pad connection casing 310 when the main gear of the snubbing device assembly 300 rotates.

In the continuous circulation system according to the embodiment of the present invention configured as described above, the upper pipe RAM unit 120 and the lower pipe RAM unit 130, which constitute the chamber assembly 100, And the pipe rams 121 and 131, so that the equilibrium distribution of the supporting force is achieved, so that the deformation of the drill pipe 500 can be minimized. Also, since the continuous circulation system according to the embodiment of the present invention is connected to the sliding control cylinder 180 in which the blind RAM unit 140 constituting the chamber assembly 100 is vertically arranged to adjust the vertical height, The adjustment of the position of the blind ram 141, which must be operated to avoid the tool joint portion of the drill pipe 500, is simple and easy to perform. The continuous circulation system according to the embodiment of the present invention allows the cylindrical roller bearing 330 to be disposed between the pad connection casing 310 and the snooping cap head 320 constituting the snubbing device assembly 300, When the main gear of the snubbing device assembly 300 rotates, the pad connection casing 310 also smoothly and stably rotates to smoothly perform the function of the snubbing device assembly 300.

While the present invention has been shown and described with reference to certain preferred embodiments thereof, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the spirit or scope of the invention. As will be appreciated by those of ordinary skill in the art.

100: chamber assembly
110: Vertical arrangement main cylinder
120: upper pipe ram unit
121: upper pipe ram
122, 132: Pipe ram body
1221, 1321: ram block
1221a and 1321a:
1221b, 1321b: seal mounting groove
1221c, 1321c: Packer mounting groove
1222, 1322: passage
1223, 1323: Top seal
1224, 1324: front packer
130: Lower pipe RAM unit
131: Lower pipe ram
140: Blind Ram Unit
141: Blind Ram
150a: Lower chamber
150b: upper chamber
160a: Lower mud valve
160b: upper mud valve
170: blind ram chamber
180: Sliding control cylinder
190: chamber plate
200: Rotary slip assembly
210: Slip pad
300: Snubbing device assembly
310: Pad connection casing
320: Snooking cap head
330: Cylindrical Roller Bearing
340: Snaking cap cylinder
400: Pipe guide assembly
500: Drill pipe
600: main plate
700: Subplate

Claims (5)

A chamber assembly (100) having an interior space in which the mud can be received, the drill pipe (500) passing through the interior space vertically; A plurality of slip pads 210 disposed below the chamber assembly 100 and closely contacting the outer circumferential surface of the drill pipe 500 under the chamber assembly 100 support the drill pipe 500 in the lateral direction A rotary slip assembly 200 is provided. A snubbing device assembly (300) disposed above the chamber assembly (100) to induce connection and disconnection of the drill pipe (500); And a controller for controlling operations of the chamber assembly 100, the rotary slip assembly 200, and the snubbing device assembly 300,
The chamber assembly (100)
A main plate 600 secured to the mounting surface and a plurality of vertically arranged main cylinders 150 fixed to upper and lower ends of the chamber plate 190 disposed above the chamber assembly 100 to adjust the height of the chamber assembly 100 110); An upper pipe RAM unit 120 and a lower pipe RAM unit 130 arranged vertically and supporting the drill pipe 500 in a lateral direction; And a blind RAM unit (140) disposed between the upper pipe RAM unit (120) and the lower pipe RAM unit (130) to divide the internal space vertically,
The upper pipe RAM unit 120 and the lower pipe RAM unit 130, respectively,
Four pipe rams 121 and 131 radially disposed at intervals of 90 degrees around the drill pipe 500; Passages 1222 and 1322 through which the four pipe rams 121 and 131 pass are radially passed through at intervals of 90 degrees and four ram blocks 1221 and 1321 arranged at intervals of 90 degrees The ram blocks 1221 and 1321 are formed in a structure in which arc-shaped connecting members 1221a and 1321a having connecting surfaces inclined at an angle of 45 ° form left and right sides, And a body 122 (132)
The RAM blocks 1221 and 1321,
Seal mounting grooves 1221b and 1321b formed in a shape of arc along the rear line of the link members 1221a and 1321a; (1221c, 1321c) formed in a shape of arc between a pair of connecting members (1221a, 1321a) arranged up and down on the front end portion, and the packing mounting grooves (1221c, 1321c) A top seal 1223 (1323) having an elongated elliptical shape and having a tapered upper surface protruding from the upper surface of the ram blocks (1221, 1321); The front packers 1221 and 1321 are formed in a shape of arc having left and right sides inclined at an angle of 45 degrees and inserted into the packer mounting grooves 1221c and 1321c so that a tapered front surface protrudes from the front surfaces of the ram blocks 1221 and 1321. [ 1224) < / RTI > (1324). delete delete A chamber assembly (100) having an interior space in which the mud can be received, the drill pipe (500) passing through the interior space vertically; A plurality of slip pads 210 disposed below the chamber assembly 100 and closely contacting the outer circumferential surface of the drill pipe 500 under the chamber assembly 100 support the drill pipe 500 in the lateral direction A rotary slip assembly 200 is provided. A snubbing device assembly (300) disposed above the chamber assembly (100) to induce connection and disconnection of the drill pipe (500); And a controller for controlling operations of the chamber assembly 100, the rotary slip assembly 200, and the snubbing device assembly 300,
The chamber assembly (100)
A main plate 600 secured to the mounting surface and a plurality of vertically arranged main cylinders 150 fixed to upper and lower ends of the chamber plate 190 disposed above the chamber assembly 100 to adjust the height of the chamber assembly 100 110); An upper pipe RAM unit 120 and a lower pipe RAM unit 130 arranged vertically and supporting the drill pipe 500 in a lateral direction; A blind RAM unit 140 disposed between the upper pipe RAM unit 120 and the lower pipe RAM unit 130 to divide the internal space vertically; The blind ram unit 140 is vertically connected to the blind ram unit 140 and the height of the blind ram unit 140 is adjusted so that the blind ram unit 140 can move in an inner space of the drill pipe 500, And a sliding control cylinder (180) for dividing the upper and lower portions,
Each of the upper pipe RAM unit 120 and the lower pipe RAM unit 130
Characterized in that it comprises four pipe rams (121) (131) radially disposed at 90 [deg.] Intervals about the drill pipe (500). The method according to claim 1 or 4,
The snubbing device assembly (300)
And a cylindrical roller bearing 330 bolted to the pad connection casing 310 and fitted and fixed in a bearing mounting groove formed in the bottom surface of the snorking cap head 320, To allow the pad connection casing (310) to rotate.

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