KR102260475B1 - blind ram unit for continuous circulation process - Google Patents

Abstract

The present invention relates to a blind ram unit applied to a continuous circulation system, and more specifically, relates to a blind ram unit for selectively shielding a space where a fluid is accommodated together with a drill pipe in the continuous circulation system. The blind ram unit for continuous circulation system includes a blind ram chamber, and two blind ram blocks.

Description

Blind ram unit for continuous circulation process

The present invention relates to a blind ram unit applied to a continuous water circulation system for circulating while maintaining the pressure of the drilling mud.

In the case of excavating rocks and sand to explore underground resources on the seabed or land or to investigate the structure and condition of strata, it is required to maintain the pressure of the mud in the drilling part within a certain condition.

When the pressure of the mud is too low, the borehole wall is compressed and collapsed by the force of underground fluids and gases (pore pressure). When the pressure of the mud is too high, cracks are generated in the surrounding rock due to expansion and the mud escapes through these cracks. Loss occurs during the cycle.

Therefore, it is important to maintain the pressure of the drilling mud within a limited pressure window, and for this purpose, a Continuous Circulation System (CCS) is used.

That is, the continuous water circulation system induces continuous operation of the mud pump throughout the drilling operation process, including connection and disconnection of the drill pipe, so that the mud is continuously circulated in the drilling apparatus.

To this end, the continuous water circulation system includes a chamber assembly / rotary slip assembly / snubbing device assembly / pipe guide assembly, cylinder, pipe ram, blind ram, ram block, valve, mud pump, etc., and the circulation of drilling mud The connection or disconnection of the drill pipe is made by varying the path stepwise.

In this regard, Republic of Korea Patent Registration No. 10-1959829 "continuous water circulation system", Republic of Korea Patent Registration No. 10-2115513 "improved continuous water circulation system" and the like are known.

On the other hand, Figure 1 shows an embodiment of the circulation process of the continuous water circulation system.

Referring to the drawings, the drilling mud extracted through the drill pipe is supplied into the chamber through the circulation pipe, and such a chamber is changed into a multi-stage partitioned space by an upper/lower pipe ram and a central blind ram.

The space partition structure as described above is for changing the circulation path of the drilling mud for additional connection or release of the drill pipe. As shown, the circulation path of the fluid according to the shielding and opening order of the upper/lower pipe ram and the blind ram while varying the drilling fluid pressure.

Therefore, in the continuous water circulation system as described above, it is important to maintain pressure and prevent leakage when dividing the space inside the chamber, and for this, a ram packer for sealing is installed in the pipe ram and the blind ram.

On the other hand, the ram packer installed in the pipe ram or blind ram directly contacts the sealing object to form a sealed structure, and forms an organic coupling structure with the ram chamber and ram block to reduce flow and improve airtight performance. Efforts are being made

US 10-1959829 B1 US 10-215513 B1

It is an object of the present invention to provide a blind ram unit for a continuous water circulation system that can improve airtightness by being mounted on the continuous water circulation system.

As a technical means for solving the above-mentioned problems, the blind ram unit for a continuous water circulation system according to an embodiment of the present invention selectively shields a space in which a fluid is accommodated together with a drill pipe in a continuous water circulation system. A blind ram unit for a blind ram unit, in which a drill pipe accommodating part opened in the vertical direction is formed in the center in a hexahedral shape, and blind ram insertion parts providing an entry and exit path for the blind ram block entering and exiting through a cylinder are formed on both sides facing each other. The chamber, one end of which is connected to the cylinder, enters and exits through the blind ram insert, and is in contact with each other at a position where the drill pipe accommodated therein does not interfere with each other to form an airtight structure. Two blind ram packers providing an installation space and a blind ram block, wherein the blind ram packer has a semicircular shielding sealing part, and the shielding sealing part is formed to extend a predetermined length upward and downward with the shielding sealing part in the center, and has a predetermined thickness in a shape orthogonal to the shielding sealing part. It is configured to include a block mounting part having a semicircular shape, and on the side of the block mounting part of the blind ram packer, a step having a shape corresponding to a stepped groove formed in a concave shape on the front surface of the blind ram block body is formed, and the blind ram block, A blind ram block body provided with a cylinder connection part including a recess and a protrusion to be connected to the cylinder head on the rear side, and a blind ram packer fastening part providing an installation space for mounting the blind ram packer on the front side of the blind ram block body The blind ram packer fastening part includes a top packer fastening part formed on a front upper portion of the blind ram block body, a middle packer fastening part and a bottom packer fastening part, and the middle packer fastening part includes the top packer fastening part and The shield sealing part of the blind ram packer is positioned at a rear side of the bottom packer fastening part between the top packer fastening part and the bottom packer fastening part, and the blind ram insertion part includes a horizontal surface formed in a horizontal direction toward the drill pipe receiving part; , the blind The ram block is formed to include a tapered surface that is inclined outwardly from the edge of the horizontal plane to expand the entry space as the starting end at which the ram block enters, and in the blind ram chamber, the drill pipe receiving part and the blind ram inserting part intersect A packer fixing groove may be formed for pressing and fixing the blind ram packer mounted on the blind ram block while limiting the insertion position of the blind ram block inserted to a certain depth in the region.

In addition, in the blind ram unit for a continuous water circulation system according to an embodiment of the present invention, a coupling allowance may be formed in the cylinder connection part of the blind ram block to be movable a predetermined distance in the vertical direction after the cylinder head is mounted. have.

In addition, in the blind ram unit for a continuous water circulation system according to an embodiment of the present invention, one or more processing holes into which a lubricant is injected may be formed in the blind ram packer.

In addition, in the blind ram unit for a continuous water circulation system according to an embodiment of the present invention, one or more processing holes through which a lubricant can be injected may be formed on a side surface of the blind ram packer fastening part.

According to the present invention, the bonding relationship between the blind ram chamber, the blind ram block, and the blind ram packer is made stronger, so that the airtight performance can be further improved.

1 is a view showing an embodiment of a continuous water circulation system circulation process.
2 is a view showing an embodiment of a ram unit test bed for a continuous water circulation system.
3 is a view showing a detailed configuration of a blind ram unit according to the present invention.
4 is a view for showing a detailed structure of a blind ram chamber, which is a main part of the present invention.
5 is a view for showing a detailed structure of a blind ram block, which is a main part of the present invention.
6 is an enlarged front view for showing the stepped groove of the blind ram block, which is the main part of the present invention.
7 is a view for showing a detailed structure of a blind ram packer, which is a main part of the present invention.
8 is a view for showing the coupling structure of the blind ram unit according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components in each drawing, the same components are denoted by the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in the description of the embodiment, if it is determined that a detailed description of a related known configuration or function, such as a drill pipe or a cylinder, interferes with the understanding of the embodiment of the present invention, the description is simplified or omitted, and what component is When it is described as “included” or “connected” to one side of another component, or that a component is “formed” together with another component, the component is directly provided, connected, or referred to one side of the other component. Although it may be formed by a composition, it should be understood that another element may be "comprised" or "connected" between each element, or may be "formed" together with another element.

On the other hand, below, the present invention is described in a form mounted on a ram unit test bed for a continuous water circulation system, but it can be applied to shield the fluid movement path at one side of the chamber of the actual continuous water circulation system.

2 is a view showing an embodiment of a ram unit test bed for a continuous water circulation system is shown.

Referring to the drawings, the ram unit test bed for the continuous water circulation system (hereinafter referred to as the “test bed 100”) for the description of the present invention is a test fluid in the test chamber 600 in which the drill pipe is accommodated for a certain time. It is configured to check whether a leak or a pressure drop inside the test chamber 600 occurs while circulating.

To this end, the test bed 100 includes a blind ram unit 400 for shielding the lower side of the test chamber 600 and a pipe ram unit 200 for shielding the upper side, and the pipe ram unit 200 . and the blind ram unit 400 are installed to be spaced apart by a height corresponding to the test chamber 600 by the posts 130 .

In addition, a base plate 120 for stable support is formed on the lower side of the blind ram unit 400 , and the drill pipe P is accommodated in the pipe ram unit 200 , and the received drill pipe P is fixed The drill pipe base flange 160 is fastened for this purpose.

In addition, the pipe ram unit 200 is further provided with a pipe ram cylinder 280 for providing a pressing force toward the drill pipe P, and the blind ram unit 400 has a blind in order to provide a pressing force for space shielding. A ram cylinder 480 is further provided.

Each of the cylinders 280 and 480 corresponds to the number of ram blocks to be described below, and the assembly convenience of the cylinders 280 and 480 may be improved by the guide bar 180 .

Meanwhile, a plurality of test holes 140 are provided in the test chamber 600 whose upper and lower sides are shielded by the pipe ram unit 200 and the blind ram unit 400 , respectively, as described above.

The test hole 140 includes a fluid supply hole for supply and recovery of a test fluid, a fluid recovery hole and a sensor hole for installing a sensor, and the sensor hole detects the real-time changing internal pressure of the test chamber 600 . A pressure gauge hole may be further included to check the pressure changed in real time at the test site based on the pressure sensor hole that is measured and transmitted as a digital value.

Hereinafter, the blind ram unit 400 forming a sealed structure at the lower side of the test chamber 600 will be described.

3 is a view showing the detailed configuration of the blind ram unit according to the present invention, FIG. 4 is a diagram showing the detailed structure of the blind ram chamber, which is the main part of the present invention, and FIG. 5 is the main part of the present invention A drawing is shown to show the detailed structure of the blind ram block, which is a component, and FIG. 6 is an enlarged front view for showing the stepped groove of the blind ram block, which is the main component of the present invention, and FIG. 7 is the blind which is the main component of the present invention. A drawing is shown to show the detailed structure of the ram packer.

Referring to these drawings, the blind ram unit 400 includes a hexahedral blind ram chamber 420 , a blind ram block 440 selectively mounted in the blind ram chamber 420 , and the blind ram block 440 . ) and is configured to include a blind ram packer 460 to form an airtight performance.

In this embodiment, the blind ram chamber 420 includes a drill pipe accommodating part 424 formed in a vertical direction in a rectangular normal blind ram chamber body 422 and two opposite sides of the blind ram chamber 420 . It includes a blind ram insert 421 formed on the side of the dog.

In addition, a test chamber fastening hole 424a is formed on the upper surface of the blind ram chamber body 422 so that the lower end of the test chamber 600 is fastened, and the blind ram insertion part 421 is formed on the side surface of the blind ram. A blind ram cylinder fastening hole 422a is further formed so that the cylinder 480 can be installed.

The drill pipe accommodating part 424 is an open space formed in the central portion of the blind ram chamber body 422 and corresponds to the top and bottom so that the blind ram block 440 and the blind ram packer 460 coupled thereto can be accommodated therein. formed to a depth of

In addition, packer fixing grooves 426 are further formed on upper and lower inner surfaces of the blind ram chamber body 422 adjacent to the drill pipe receiving part 424 .

The packer fixing groove 426 is configured to press the blind ram packer 460 inserted through the blind ram insertion part 421 so that it is not easily removed, and a predetermined size protrudes toward the upper and lower surfaces of the blind ram packer 460 . is formed

In addition, a portion into which the blind ram block 440 is inserted is formed into a horizontal surface 421a and a tapered surface 421b in the blind ram insertion part 421 .

The horizontal surface 421a partially supports the load of the blind ram block 440 while guiding the linear movement toward the drill pipe receiving portion 424, and the tapered surface 421b is the blind ram block 440. In case of entry, the entry entrance is expanded so that it can be inserted more easily.

On the other hand, the blind ram block 440 includes a blind ram block body 441 provided with a cylinder connection part 446 to be coupled to the cylinder, and a blind ram packer coupling part 442 to which the blind ram packer 460 is mounted. is composed by

The blind ram block body 441 is configured to enter and exit through the blind ram insert 421 formed on the opposite sides of the blind ram chamber 420, and two of them are respectively arranged at 180° intervals, while entering and exiting the blind ram chamber 420. A cylinder connection part 446 is formed on the rear side to transmit power for the purpose.

The cylinder connection part 446 is formed in a shape including a recess and a protrusion so that the cylinder head 482 (refer to (a) of FIG. 8) can be fitted, and a coupling structure of the cylinder head 482 and the cylinder connection part 446 will be described in more detail below.

On the other hand, the blind ram packer fastening portion 442 is formed to be spaced apart from each other by a predetermined distance up and down on the front side of the blind ram block body 441 , and the rear end thereof is formed in a semicircular curvature shape corresponding to the front side of the blind ram block body 441 . .

In detail, a top packer fastening portion 442a is formed on the front upper portion of the blind ram block body 441 .

The top packer fastening part 442a is formed in a semicircular shape having a predetermined width.

In addition, the upper surface of the top packer fastening portion 442a is formed to have a lower height than the upper surface of the blind ram block body 441 and to be lower than the protrusion height of the packer fixing groove 426 so that the blind ram block 440 is drilled. No interference occurs when entering toward the pipe receiving portion 424 .

In addition, the rear end of the top packer fastening part 442a is spaced apart from the blind ram block body 441 by a certain distance, and the middle packer fastening part 442b is provided on the lower surface of the top packer fastening part 442a to the blind ram block body ( The top packer mounting groove 443a of a predetermined depth is formed by the top packer coupling part 442a, the middle packer coupling part 442b, and the blind ram block body 441 by being in contact with the front surface of the 441 .

The middle packer fastening part 442b is formed in a shape corresponding to the top packer fastening part 442a, the left and right both sides are relatively short, and the top packer fastening part 442a is located behind the top packer fastening part 442a. A predetermined space is formed below the fastening portion 442a to form a middle packer mounting groove 423b in which the central portion of the blind ram packer 460 can be mounted.

And, on the lower side of the middle packer fastening part 442b, the bottom packer fastening part 442c has the same shape and size as the top packer fastening part 442a and is spaced apart by the thickness of the middle packer fastening part 442b. The bottom packer mounting groove 443c is formed in the same manner as the top packer mounting groove 443a described above.

In addition, in the case of the bottom packer fastening part 442c, the lower surface of the bottom packer fastening part 442c is higher than the lower surface of the blind ram block body 441 as well as higher than the protrusion height of the packer fixing groove 426 By being formed at a high position, interference does not occur when the blind ram block 440 enters toward the drill pipe receiving portion 424 .

On the other hand, at least one processing hole 444 is further formed on the side of the blind ram packer fastening portion 442 formed as described above, and the blind ram packer 460 is easily coupled to the processing hole 444 in the future. A pressure-sensitive adhesive to form a separable structure may be injected.

As described above, the blind ram packer 460 is mounted on the blind ram block 440 having the above shape.

The blind ram packer 460 is made of a polymer material, is relatively softer than the blind ram block 440 , and can be elastically deformed by external pressure, so that the blind ram packer 460 can be buttted to each other inside the blind ram chamber 420 . .

In detail, the blind ram packer 460 may be divided into a shielding sealing part 462 and a block mounting part 464 , and the shielding sealing part 462 is in direct contact with each other inside the drill pipe receiving part 424 for drilling. The pipe receiving portion 424 is shielded.

In addition, when the blind ram packer 460 is mounted on the blind ram block 440 , the shielding sealing part 462 of the blind ram packer 460 may include the top and bottom packer coupling parts 442a of the blind ram block 440 . By being formed to protrude than the 442c, the drill pipe receiving portion 424 can be more stably shielded.

In addition, a middle packer fastening part receiving groove 464a opened in an area corresponding to the middle packer fastening part 442b is formed on the rear side of the blind ram packer 460 .

The block mounting part 464 is formed to extend a predetermined length upward and downward with the shielding sealing part 462 in the center, and is formed in a semicircular shape having a predetermined thickness in a shape orthogonal to the shielding sealing part 462 .

In addition, a step 464b is further formed on the side of the block mounting part 464 to fit into a stepped groove 441a that is concave in the front of the blind ram block body 441 , so that the blind ram packer 460 is fitted. A stronger bonding force can be formed.

In addition, a plurality of processing holes 462a and 462b are further formed in the shielding sealing portion 462 and the block mounting portion 464 .

A lubricant, such as grease, is injected into each of the processing holes 462b and 464a to facilitate entry/exit into the blind ram chamber 420 .

Meanwhile, FIG. 8 is a view showing the coupling structure of the blind ram unit according to the present invention.

Referring to the drawings, the blind ram packer 460 mounted on the blind ram block 440 may be moved into/out of the blind ram chamber body 422 by the blind ram cylinder 480 , and for this purpose, the blind The cylinder head 482 of the ram cylinder 480 is formed to have a shape corresponding to the cylinder connection part 446 and is coupled thereto.

At this time, the cylinder connection part 446 is formed to be larger than the cylinder head 482 by a predetermined size to have a coupling margin 446a, and the coupling margin 446a formed as described above is when the cylinder head 482 is pressed. The blind ram block 440 is shaken up and down to be pushed in.

Accordingly, the blind ram block 440 can be more easily and stably entered into the blind ram chamber 420 by the tapered surface 421b formed in the blind ram insertion part 421 and the coupling allowance 446a. have.

Meanwhile, referring to FIG. 8A , when the blind ram block 440 accommodated in the blind ram chamber body 422 and the blind ram packer 460 mounted thereon enter a predetermined depth, the block mounting part 464 ) comes into contact with the packer fixing groove 426 (refer to (b) of FIG. 8). At this time, the block mounting part 464 in contact with the packer fixing groove 426 is elastically deformed by pressure while the blind ram block 440. of course, the blind ram packer 460 can be more firmly fixed.

And, as the shield sealing part 462 is mounted as a support structure in which three sides are fixed by the top packer coupling part 442a, the bottom packer coupling part 442c, and the middle packer coupling part 442b, the transmission of the pressing force is performed. It can be done more stably.

The two blind ram packers 460 mounted as described above are disposed to face each other at an interval of 180° and are pressed toward the drill pipe receiving part 424 inside the blind ram chamber 420 and in close contact with each other, so that the test chamber ( 600), a stable sealing structure can be formed from the lower side.

100..........Test bed 200........Pipe ram unit
280........Pipe ram cylinder 400........Blind ram unit
420.............Blind ram chamber 440........Blind ram block
460......... Blind Ram Packer 480........ Blind Ram Cylinder
600........Test chamber

Claims (4)

A blind ram unit for selectively shielding the space where the fluid is accommodated together with the drill pipe in the continuous water circulation system.
a blind ram chamber having a hexahedral shape, a drill pipe receiving part opening vertically in the center, and blind ram inserting parts providing an entry/exit path for a blind ram block that enters and exits through a cylinder is formed on both sides facing each other;
Two blind rams having one end connected to the cylinder and entering and exiting through the blind ram insert, providing an installation space for two blind ram packers to contact each other at a position where the drill pipe accommodated therein does not interfere to form an airtight structure block; including;
The blind ram packer,
It is configured to include a semicircular shielding sealing part, and a semicircular block mounting part having a predetermined thickness in a shape orthogonal to the shielding sealing part by extending a predetermined length upward and downward with the shielding sealing part in the center,
On the side of the block mounting part of the blind ram packer,
A stepped groove having a shape corresponding to a stepped groove formed with a concave indentation is formed on the front surface of the blind ram block body,
The blind ram block,
A blind ram block body provided with a cylinder connection part including a recess and a protrusion to be connected to the cylinder head on the rear side, and a blind ram packer fastening part providing an installation space for mounting the blind ram packer on the front side of the blind ram block body includes,
The blind ram packer fastening part,
a top packer fastening part, a middle packer fastening part, and a bottom packer fastening part formed on the front upper part of the blind ram block body;
The middle packer fastening part is located behind the top packer fastening part and the bottom packer fastening part so that the shield sealing part of the blind ram packer is positioned between the top packer fastening part and the bottom packer fastening part,
The blind ram insertion unit,
It is formed to include a horizontal surface formed in a horizontal direction toward the drill pipe receiving part, and a tapered surface formed to be inclined outward from the edge of the horizontal surface as a starting end into which the blind ram block enters, thereby expanding the entry space,
In the blind ram chamber,
Forming a packer fixing groove for pressing and fixing the blind ram packer mounted on the blind ram block while limiting the insertion position of the blind ram block to be inserted to a certain depth in the area where the drill pipe receiving part and the blind ram inserting part intersect Blind ram unit for continuous water circulation system. The method of claim 1,
Blind ram unit for continuous water circulation system, characterized in that the coupling allowance is formed in the cylinder connection part of the blind ram block to be movable a predetermined distance in the vertical direction after the cylinder head is mounted. The method of claim 1,
The blind ram unit for a continuous water circulation system, characterized in that the blind ram packer is formed with one or more processing holes into which lubricant is injected. The method of claim 1,
The blind ram unit for a continuous water circulation system, characterized in that at least one processing hole through which a lubricant can be injected is formed on a side surface of the blind ram packer fastening part.

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