KR20230052451A - Mud stirrer for Drillship - Google Patents

Abstract

The present invention provides a mud agitator for a drillship, which comprises: an upward circulation device (520) in a mud tank; a downward circulation device (530); and an inclined stirring device (540). The point of the present invention is to maintain uniform viscosity, density, and concentration of the mud while pulverizing the mud that exists in lump form in the mud tank into fine powder.

Description

Mud stirrer for drillship {Mud stirrer for Drillship}

The present invention relates to a stirrer, and more specifically, to a mud stirrer for a drilling vessel capable of uniformly maintaining the viscosity, density, concentration, etc. of mud while pulverizing lumpy mud into fine powder.

In general, a mud circulating system, which is one of the most important systems in onshore and offshore drilling systems, is a stable supply of drilling mud and drilling work to return cutting pieces of rock to the ground. serves to lift it up.

At this time, as the density and viscosity of the mud in the mud tank are kept constant, more stable and effective drilling can be achieved. A mud agitator, a device that evenly mixes the mud in the tank, is used.

1 is a schematic diagram of a conventional mud circulation system for a drilling vessel.

As shown, the transfer unit 400 is connected to the inlet and outlet of the mud tank 100, respectively, and the circulation pipe 410 is connected at both ends to the inlet and outlet of the mud tank 100, respectively, to the drilling line ( 10), a structure for circulating mud (M) is known.

However, the conventional mud tank as described above has a problem in that the viscosity, density, concentration, etc. of mud cannot be maintained uniformly, and mud that may exist in a lumpy form cannot be pulverized.

Registered Patent Publication No. 10-1695887 (2017.01.13. Notice)

The present invention is to solve the above problems, and a mud stirring device for a drilling vessel capable of pulverizing mud in a lumpy form into fine powder while maintaining uniform viscosity, density, concentration, etc. of mud in a mud tank. is to provide

The mud stirring device for a drilling vessel of the present invention has a support rod fixed to the inner surface of the mud tank at one end and the outer surface of the upper circulation pipe at the other end, and an upper circulation tube having a cylindrical structure with an open upper surface and a closed lower surface. And, a partition wall provided in a structure that closes across the lower surface inside the upper circulation pipe and forming a space between the lower surface of the upper circulation pipe, and a motor provided in the space between the partition wall and the lower surface of the upper circulation pipe , Upward circulation device including a side through-hole provided in a structure penetrating the outer surface of the upper circulation pipe above the partition wall and an upper screw provided inside the upper circulation pipe above the partition wall and connected to the rotation shaft of the motor, One end is fixed to the inner surface of the mud tank, the other end is a support bar fixed to the outer surface of the lower circulation pipe, the lower surface is open, and the upper surface is closed. It is provided with a structure that closes across the side, and a partition wall forming a space between the upper surface of the lower circulation pipe, a motor provided in the space between the partition wall and the upper surface of the lower circulation pipe, and a lower circulation pipe below the partition wall. It is characterized in that it consists of a downward circulation device including a side through-hole provided in a structure penetrating the outer surface and a downward screw provided inside the downward circulation pipe below the bulkhead and connected to the rotation shaft of the motor.

In addition, the downward circulation device is characterized in that it is installed on the opposite side of the mud tank in which the upward circulation device is installed.

In addition, an inclined direction stirring device is further provided; The inclined agitator has a disk-shaped structure with one side fixed to the inner upper surface of the mud tank and the other side fixed to the support plate, the hydraulic cylinder fixed to the upper surface, and the support plate to which the inclined circulation pipe is fixed to the lower surface. And, the lower surface is open, the upper surface is fixed to the bottom surface of the support plate and has a cylindrical structure in which one side is closed, and is provided with a structure that is closed across the upper surface inside the inclined circulation pipe, inclined circulation A partition wall forming a space between the upper surface of the tube, a motor provided in the space between the partition wall and the upper surface of the inclined circulation tube, a side through-hole provided in a structure penetrating the outer surface of the inclined circulation tube below the partition wall, and one side It is connected to the motor and rotates, and the other side is characterized in that it consists of a rotating shaft having a structure protruding from the lower surface of the inclined circulating pipe, and a stirring blade coupled to the end of the rotating shaft.

In addition, a grinding device is further provided; The crushing device has a disk-shaped structure, a lower plate that is shaft-coupled with a motor provided on the inner surface of the mud tank and rotates at a high speed by the driving of the motor, and an upper plate that has a disk-shaped structure and is provided with a certain distance from the lower plate. And, it has a structure of a thin wire of high strength material, characterized in that consisting of a plurality of pulverized steel wire provided between the upper plate and the lower plate.

The present invention has the effect of uniformly maintaining the viscosity, density, concentration, etc. of the mud while pulverizing the mud existing in the form of lumps in the mud tank into fine powder.

In addition, there is an effect of preventing various marine organisms that are mixed and introduced into the mud during the drilling process from being attached to the agitator blades.

1 is a schematic diagram of a conventional mud circulation system for a drilling vessel.
2 is a cross-sectional view of a mud stirring device for a drilling vessel according to the present invention.
Figure 3 is an enlarged cross-sectional view of the upward circulation device.
Figure 4 is an enlarged cross-sectional view of the downward circulation device.
Figure 5 is an enlarged cross-sectional view of the inclined direction stirring device
Figure 6 is an installation state diagram and a partially enlarged perspective view of the crushing device.
Figure 7 is a perspective view of another embodiment of the stirring blades.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. For reference, the size of components, the thickness of lines, etc. shown in the drawings referred to in describing the present invention may be somewhat exaggerated for convenience of understanding.

In addition, the terms used in the description of the present invention are defined in consideration of the functions in the present invention, and may vary depending on the user, operator's intention, convention, and the like. Therefore, the definition of this term deserves to be made based on the contents throughout this specification.

And in this application, terms such as 'include' and 'have' refer to the existence of a specific number, step, operation, component, part, or combination thereof described in the specification, but one or more other It should be understood that the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only this embodiment makes the disclosure of the present invention complete, and the scope of the invention to those skilled in the art. It is provided for complete information.

Therefore, since the present invention can have various changes and various forms, implementation examples (態樣, aspects) (or embodiments) will be described in detail in the specification. However, this is not intended to limit the present invention to a specific disclosed form, and it should be understood to include all changes, equivalents, and substitutes included in the technical spirit of the present invention, and the singular expression used in this specification is clearly different from the context. Include plural expressions unless otherwise indicated.

However, in describing the present invention, detailed descriptions of known or known functions or configurations will be omitted to clarify the gist of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

2 is a cross-sectional view of a mud agitator for a drilling vessel according to the present invention, FIG. 3 is an enlarged cross-sectional view of an upward circulation device, FIG. 4 is an enlarged cross-sectional view of a downward circulation device, and FIG. 5 is an enlarged cross-sectional view of an inclined direction agitator.

As shown, the agitator 500 for a drilling vessel includes a mud tank 510, an upward circulation device 520, a downward circulation device 530, and an inclined direction agitator 540.

The mud tank 510 has a cylindrical or hexahedral shape with a space formed therein, and has a function of storing mud therein.

The upward circulation device 520 is provided on the inner surface of the mud tank 510, and includes a support rod 521, an upward circulation pipe 522, a side through hole 523, a partition wall 524, and an upward screw. (525).

The support bar 521 has one end fixed to the inner surface of the mud tank 510 and the other end fixed to the outer surface of the upward circulation pipe 522 described later, so that the upper circulation pipe 522 is fixed to the mud tank 510. ) has the function of fixing to the inner surface of the

The upper circulation pipe 522 has a cylindrical structure with an open upper surface and a closed lower surface.

The partition wall 524 is provided with a structure that crosses and closes the lower side of the inside of the upper circulation pipe 522 . A space is formed between the partition wall 524 and the lower surface of the upper circulation pipe 522, and the motor M is built in, and the rotation shaft connected to the motor M passes through the center of the partition wall 524 in a rotatable state. and is concluded

The side through hole 523 is provided in a structure penetrating the outer surface of the upper circulation pipe 522 above the partition wall 524 .

The upper screw 525 is provided inside the upper circulation pipe 522 above the partition wall 524 and is connected to the rotational axis of the motor M, so that it moves upward in conjunction with the rotation of the motor M. The screw 525 also rotates.

Looking at the operating relationship of the upward circulation device as described above,

When the motor M is driven, the upward screw 525 connected to the motor M is also rotated, and when the upward screw 525 is rotated, the mud in the mud tank 510 moves to the side of the upward circulation pipe 522. After being introduced into the through hole 523, it is discharged to the upper surface of the upper circulation pipe 522.

That is, since the mud in the mud tank 510 is introduced from the lower side of the upper circulation pipe 522 and discharged upward, the mud is circulated while stirring the mud by the upper screw 525 to improve the viscosity of the mud, It has the effect of making the density, concentration, etc. uniform.

The lower circulation device 530 has the same structure as the upper circulation device 520, and is installed on the opposite side of the mud tank 510 in which the upper circulation device 520 is installed, and only the upper and lower directions are opposite. The difference is that they are installed in the direction. The downward circulation device 530 is provided on the inner surface of the mud tank 510, and includes a support rod 531, a downward circulation pipe 532, a side through hole 533, a partition wall 534, and a downward screw. (535).

The support rod 531 has one end fixed to the inner surface of the mud tank 510 and the other end fixed to the outer surface of the lower circulation pipe 532 described later, so that the lower circulation pipe 532 is fixed to the mud tank 510. ) has the function of fixing to the inner surface of the

The lower circulation pipe 532 has a cylindrical structure with an open lower surface and a closed upper surface.

The partition wall 534 is provided with a structure that crosses the upper side of the inside of the lower circulation pipe 532 and closes it. A space is formed between the partition wall 534 and the upper surface of the lower circulation pipe 532, and the motor M is built in, and the rotation shaft connected to the motor M passes through the center of the partition wall 534 in a rotatable state. and is concluded

The side through hole 533 is provided in a structure penetrated through the outer surface of the lower circulation pipe 532 below the partition wall 534 .

The lower screw 535 is provided inside the lower circulation pipe 532 below the partition wall 534 and is connected to the rotational shaft of the motor M, so that it interlocks with the rotation of the motor M to move downward. The screw 535 also rotates.

Looking at the operating relationship of the downward circulation device as described above,

When the motor M is driven, the lower screw 535 connected to the motor M is also rotated, and when the lower screw 535 is rotated, the mud in the mud tank 510 moves to the side of the lower circulation pipe 532. After being introduced into the through hole 533, it is discharged to the lower surface of the lower circulation pipe 532.

That is, since the mud in the mud tank 510 is introduced from the upper side of the lower circulation pipe 532 and discharged downward, the mud is circulated while stirring the mud by the lower screw 535 to improve the viscosity of the mud, It has the effect of making the density, concentration, etc. uniform.

Therefore, due to the organic combination of the upper circulation device 520 and the lower circulation device 530, the mud discharged upward from the upper circulation device 520 in the mud tank 510 is transferred to the lower circulation device. Since the mud is discharged downward again by the 530, the mud is circulated in a clockwise direction in the mud tank 510, which has the effect of making the viscosity, density, concentration, etc. of the mud more uniform.

The inclined direction stirring device 540 includes a hydraulic cylinder 541, a support plate 542, an inclined direction circulation pipe 543, a partition wall 544, a rotating shaft 545, a stirring blade 546, a side through hole 547 contains

Although the inclined direction stirring device 540 is illustrated as being provided with only one for convenience of description, it goes without saying that a plurality may be provided in the mud tank 510.

The hydraulic cylinder 541 has one side fixed to the inner upper surface of the mud tank 510 and the other side fixed to a support plate 542 to be described later, and the configuration for driving the hydraulic cylinder 541 is commonly known or Since it is a well-known and commonly used configuration, detailed description is omitted here.

The support plate 542 has a disc-shaped structure, a hydraulic cylinder 541 is fixed to the upper surface, and an inclined circulation pipe 543 to be described later is fixed to the lower surface.

A plurality of hydraulic cylinders 541 as described above are provided, and preferably four are formed on the support plate 542 at intervals of 90 degrees.

The inclined circulation pipe 543 has a cylindrical structure in which the lower surface is open and the upper surface is fixed to the lower surface of the support plate 542 and closed.

The partition wall 544 is provided with a structure that crosses and closes the upper side of the inside of the inclined circulation pipe 543 . A space is formed between the partition wall 544 and the upper surface of the inclined circulation pipe 543, and the motor M is built in, and the rotation shaft 545 connected to the motor M is rotatable at the center of the partition wall 544. It is penetrated and fastened in the state.

The side through-holes 547 are provided with a plurality of structures penetrating the outer surface of the inclined circulation pipe 543 below the partition wall 544 .

The rotating shaft 545 has one side connected to the motor M and rotates, and the other side has a structure protruding from the lower surface of the inclined circulating pipe 543, and the other end of the rotating shaft 545 has a stirring described later. Wings 546 are coupled.

The stirring blades 546 are coupled to the end of the rotating shaft 545 to rotate.

Looking at the operating relationship of the inclined direction stirring device as described above,

When the controller (not shown) reduces the length of the hydraulic cylinder 541 provided on one side of the support plate 542 and increases the length of the hydraulic cylinder 541 provided on the other side of the support plate 542, the inclined circulation pipe ( 543) rotates upward while drawing an arc trajectory within the mud tank 510, and when the length of the hydraulic cylinder 541 is controlled in the opposite direction, the inclined circulation pipe 543 draws an arc trajectory while rotated downward

By controlling the protruding and retracting length of the hydraulic cylinder 541 in this way, the inclined circulating pipe 543 can repeatedly rotate in the forward, backward, left, and right inclined directions.

When the inclined circulation pipe 543 rotates, the process of inflow or discharge of mud through the side through hole 547 formed on the outer surface of the inclined circulation pipe 543 is repeated.

In addition, the stirring blades 546 rotating by the drive of the motor M stir the mud while rotating in an oblique direction, which has the effect of making the viscosity, density, concentration, etc. of the mud more uniform.

That is, mud agitation by the rotation of the inclined circulation pipe 543, agitation by the circulation of the mud introduced and discharged through the side through hole 547, and the stirring blades 546 move in the inclined direction of the mud tank 510. As it rotates while stirring the mud in a complex way, it has an action and effect that can maximize the uniformity of the viscosity, density, concentration, etc. of the mud.

In the following embodiments, a crushing device will be described.

6 is an installation state diagram and a partially enlarged perspective view of a crushing device.

As shown, the grinding device 600 is provided on one open side of the upper and lower circulation devices 520 and 530 through which mud is discharged, and includes an upper plate 610, a lower plate 620, and a grinding steel wire 630. are doing

The lower plate 620 has a disk-shaped structure, is axially coupled to the motor M provided on the inner surface of the mud tank 510, and rotates at high speed by driving the motor M.

It goes without saying that the above motor is sealed.

The upper plate 610 has a disk-like structure and is provided with a predetermined distance from the lower plate 620 .

The pulverized steel wire 630 has a structure of a thin wire made of a high-strength material, and is provided in plurality between the upper plate 610 and the lower plate 620.

Looking at the operating relationship of the crushing device as described above,

Mud has a lumpy structure due to its viscosity, and the mud lumps discharged from the upper and lower circulation devices 520 and 530 are finely powdered by the grinding wire 630 of the grinding device 600 rotating at high speed. Since it is pulverized, it has the effect of maintaining the viscosity, density, concentration, etc. of mud uniformly.

In the following embodiments, the detailed structure of the agitation blades will be described.

7 is a perspective view of another embodiment of a stirring blade.

As shown, the stirring blades 546 include an upper conical portion 51, a lower conical portion 52, an upper inclined blade 53, a lower inclined blade 54, a rotary blade portion 55, It includes upper and lower through holes 56, side long grooves 57, and surface grooves 58.

The upward conical portion 51 has a conical structure with a diameter widening in the downward direction, and is provided in a certain section below the rotation shaft 545 .

The lower conical portion 52 has a conical structure in which the diameter increases in an upward direction, and is provided in a certain section below the rotary shaft 545 in a structure in which the upper surface contacts the lower surface of the upper conical portion 51 .

The upward inclined blades 53 are provided on the outer surface of the upward conical portion 51 and have a function of guiding and circulating the mud upward.

The downward inclined blades 54 are provided on the outer surface of the downward conical portion 52 and have a function of guiding and circulating the mud in a downward direction.

The rotating blades 55 are provided at the end of the rotating shaft 545 below the lower conical portion 52, and include blades having a constant thickness and provided at 90 degree intervals.

The upper and lower through-holes 56 are provided in the form of through-holes penetrating the upper and lower surfaces of the blades so that the mud flows in or out to uniformize the concentration of the mud.

The side long grooves 57 are provided in the shape of long grooves on the side of the wing, and while the mud collides with the surface of the long grooves and is pulverized, it circulates in multiple directions such as up and down or left and right directions along the long grooves, equalize the concentration.

The surface groove 58 is provided in the shape of a recessed groove on the outer surface of the wing, and while mud collides with the surface of the groove and is crushed, it circulates in multiple directions such as up and down or left and right along the groove. Uniformize the mud concentration.

Looking at the operating relationship of the stirring blades as described above,

When the rotary shaft 545 rotates, the upper and lower conical parts 51 and 52 provided on the rotary shaft 545 also rotate, and the upper and lower inclined surfaces of the upper and lower conical parts 51 and 52 are provided. The mud is circulated in the upper and lower directions by the wings 53 and 54.

In addition, when the rotary shaft 545 rotates, the rotary blade 55 also rotates, and the mud impinges on the upper and lower through-holes 56, side long grooves 57, and surface grooves 58 provided in the wings, so that the mud moves in multiple directions. Since it is circulated, it has the effect of maximizing the efficiency of uniformizing the viscosity, density, and concentration of the mud.

In the following examples, the coating composition of the stirring blades will be described.

Since the agitation blades rotate in the state of being settled in the mud, there are cases where the mud adheres to the surface due to the viscosity of the mud. will not cycle.

Therefore, this embodiment suggests a coating composition for minimizing mud or marine organisms from adhering to the agitating blades 546 by coating the outer surface of the agitating blades 546.

The coating material, based on 100 parts by weight of the solvent, 5 to 15 parts by weight of siloxane polymer, 3 to 7 parts by weight of silazane polymer, 6 to 17 parts by weight of silicone resin, 12 to 35 parts by weight of titanium dioxide, It is characterized by consisting of a composition containing 0.8 to 15 parts by weight of a curing agent.

Such a coating composition has excellent abrasion resistance, corrosion resistance and anti-sticking performance, and has an action and effect of suppressing the adhesion of various marine organisms (barnacles, etc.) that are mixed and introduced into the mud during the drilling process.

51: upper conical part 52: lower conical part
53: upward inclined wing 54: downward inclined wing
55: rotary blade portion 56: upper and lower through holes
57: side long groove 58: surface groove
510: mud tank 520: upward circulation device
521,531: support rod 522: upward circulation pipe
523,533,547: side through hole 524,534,544: bulkhead
525: upward screw 530: downward circulation device
532: lower circulation pipe 535: lower screw
540: inclined agitator 541: hydraulic cylinder
542: support plate 543: inclined circulation pipe
545: rotation shaft 546: stirring blades
600: crushing device 610: top plate
620: lower plate 630: crushed steel wire
M: motor

Claims (4)

One end is fixed to the inner surface of the mud tank 510, and the other end is a support rod 521 fixed to the outer surface of the upward circulation pipe 522,
An upper circulation pipe 522 having a cylindrical structure with an upper surface open and a lower surface closed;
A partition wall 524 provided in a structure that crosses and closes the lower surface of the inside of the upper circulation pipe 522 and forms a space between the lower surface of the upper circulation pipe 522;
A motor (M) provided in the space between the partition wall 524 and the lower surface of the upper circulation pipe 522;
A side through hole 523 provided in a structure penetrating the outer surface of the upper circulation pipe 522 above the partition wall 524,
An upper circulation device 520 provided inside the upper circulation pipe 522 above the partition wall 524 and including an upper screw 525 connected to the rotational shaft of the motor M,
One end is fixed to the inner surface of the mud tank 510, and the other end is a support rod 531 fixed to the outer surface of the lower circulation pipe 532,
A downward circulation pipe 532 having a cylindrical structure in which the lower surface is open and the upper surface is closed;
A partition wall 534 provided in a structure that crosses and closes the upper side of the lower circulation pipe 532 and forms a space between the upper surface of the lower circulation pipe 532;
A motor (M) provided in the space between the partition wall 534 and the upper surface of the lower circulation pipe 532;
A side through hole 533 provided in a structure penetrating the outer surface of the lower circulation pipe 532 below the partition wall 534,
It is provided inside the down circulation pipe 532 below the bulkhead 534 and is composed of a down circulation device 530 including a down screw 535 connected to the rotation shaft of the motor M. mud agitator for According to claim 1,
The downward circulation device 530 is a mud agitator for a drilling vessel, characterized in that installed on the opposite side of the mud tank 510 in which the upward circulation device 520 is installed. According to claim 2,
An inclined direction stirring device 540 is further provided;
The inclined direction stirring device 540,
A hydraulic cylinder 541 having one side fixed to the inner upper surface of the mud tank 510 and the other side fixed to the support plate 542;
A disk-shaped structure, a support plate 542 having a hydraulic cylinder 541 fixed on the upper surface and an inclined circulation pipe 543 fixed on the lower surface;
An inclined direction circulation pipe 543 having a cylindrical structure in which the lower surface is open and the upper surface is fixed to the bottom surface of the support plate 542 and one side is closed;
A partition wall 544 provided in a structure that crosses and closes the upper side of the inside of the inclined circulation pipe 543 to form a space between the upper surface of the inclined circulation pipe 543;
A motor (M) provided in the space between the partition wall 544 and the upper surface of the inclined circulation pipe 543;
A side through hole 547 provided in a structure penetrating the outer surface of the inclined circulation pipe 543 under the partition wall 544,
One side is connected to the motor M and rotates, and the other side has a rotating shaft 545 having a structure protruding from the lower surface of the inclined circulation pipe 543,
A mud stirring device for a drilling vessel, characterized in that it consists of a stirring blade 546 coupled to the end of the rotating shaft 545. The method of claim 3,
A grinding device 600 is further provided;
The crushing device 600,
A lower plate 620 having a disc-shaped structure, coupled to a motor M provided on the inner surface of the mud tank 510, and rotating at high speed by driving the motor M;
An upper plate 610 having a disc-shaped structure and having a predetermined distance from the lower plate 620;
Mud stirring device for a drilling vessel, characterized in that it has a structure of a thin iron wire made of high-strength material and consists of a plurality of pulverized steel wires 630 provided between an upper plate 610 and a lower plate 620.

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