KR101987980B1 - Mud System - Google Patents

Abstract

A mud system according to an embodiment of the present invention includes a mud line for supplying a mud to a drilling equipment; An oil base foot for storing an oil base mud supplied to the mud line; A water base pit storing a water base mud supplied to the mud line; A first pump for discharging the oil base mud from the oil base pit on the mud line; A second pump for discharging the water base mud from the water base pit on the mud line; A pressure relief valve provided on the mud line to open the mud when the first pump or the second pump is at a predetermined pressure or more; And a buffer tank for recovering the mud on the mud line by opening the pressure relief valve to recover the oil base pit and the water base pit, respectively.
The mud system according to the present invention temporarily stores the mud in a buffer tank without having to discharge the mud to the outside even if an emergency such as a sudden high pressure is applied to the first pump or the second pump and then the oil base mud and the water base mud Can be recovered as the oil base pits or the water base pits, which are the respective storage tanks, and waste of the expensive mud can be prevented.

Description

Mud System {Mud System}

The present invention relates to a mud system.

Due to the recent rapid industrialization, the use of resources such as oil has skyrocketed, and the stable production and supply of oil is becoming a very important issue. However, the oil field in the continental or coastal waters has already been drilled. In recent years, interest has been focused on the development of a deep-sea deep-sea oil field. Drilling is generally used to drill deep-sea oilfields.

Drill ship is an offshore structure that is equipped with advanced drilling equipment and is built in a shape similar to that of a ship so that it can be sailed by its own power. It is capable of collecting raw oil or gas in deep sea area where an offshore platform can not be installed, It is advantageous that the drilling can be terminated and the drilling can be carried out by moving to another point.

Such drillings include Derrick, which has a Moonpool structure in a vertically penetrating form and is located above the drum and has drilling rigs. Hereinafter, the process of drilling the bottom of the drill ship will be described.

First, the drill ship uses its own power to move to the drilling area and drives a Dynamic Positioning System (DPS) using a plurality of thrusters to maintain the position.

Thereafter, the drill bit is connected to a drill pipe by a drill bit, and a plurality of drill pipes are connected by a sufficient length by using a Hoisting System and a Handling System provided in Derrick, And the drilling pipe is rotated through a rotating system to form a borehole.

Once drilling is completed, Derek picks up the drill pipe, installs the casing pipe on the borehole, and performs the cementing process to fill the concrete between the casing pipe and the borehole. The drilling operation used and the casing and cementing work for installing the casing pipe are repeatedly performed to maintain the shape of the borehole having a certain depth.

When the casing pipe is installed enough to prevent the borehole from falling down, BOP (Blow Out Preventer) is connected to the riser to be connected to the borehole. In this case, the inside of the riser becomes the path of movement of the drill pipe and casing pipe.

However, lubrication and cooling of the drill bit in the drilling process, and processing of the crushed material such as rock mass produced in the borehole are required. Therefore, the drill feeds the mud to the inside of the drill pipe so that the mud is discharged at the end of the drill bit, and after the mud performs lubrication and cooling of the drill bit, (Mud Circulation System) is used. The recovered mud is re-used after the pulverized material is filtered.

The drillship repeatedly performs drilling, casing and cementing operations until the drill bit reaches the well, while driving this mud circulation system. In this case, as the diameter of the casing pipe used in the casing work becomes smaller, Drilling can be implemented continuously by replacing small drill bits.

As such, the drill rig has a system for installing and using pipes and risers, a system using a mud, and the like. In order to smoothly perform drilling work using such a system, a drill hole structure, a derrick structure, and a load structure Is required to be disposed within a certain space, so that research and development are being continuously carried out as a result of a high technological power being required.

However, in the process of collecting the mud of a drill bit, a liquid mud properly mixed to enable a drilling operation is generated as a high-pressure mud by a mud pump and introduced into a drill pipe, It comes back with a variety of cuttings, such as rock fragments, gravel, sand, silt, gas, and various impurities. The mud including various cuts is reproduced by removing various cuts through a shale shaker and a sand trap. The regenerated mud enters the mud pit or mud tank through the mud return line and is stored, then pressurized by the mud pump and fed back into the drill pipe.

In this case, when sudden high pressure is applied to the pump discharged from the mud pit, an emergency occurs and the pump must be broken or the mud must be discharged to the outside, which may delay the drilling operation.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a mud puddle which can be recycled without having to discharge the mud to the outside even when sudden high- System.

A mud system according to an embodiment of the present invention includes a mud line for supplying a mud to a drilling equipment; An oil base foot for storing an oil base mud supplied to the mud line; A water base pit storing a water base mud supplied to the mud line; A first pump for discharging the oil base mud from the oil base pit on the mud line; A second pump for discharging the water base mud from the water base pit on the mud line; A pressure relief valve provided on the mud line to open the mud when the first pump or the second pump is at a predetermined pressure or more; And a buffer tank for recovering the mud on the mud line by opening the pressure relief valve to recover the oil base pit and the water base pit, respectively.

Specifically, the oil base pit and the water base pit supply the oil base mud and the water base mud to the mud line in a non-simultaneous manner.

Specifically, the pressure safety valve may include: a first safety valve provided in the first pump; And a second safety valve provided to the second pump, wherein the pressure relief valve recovers the mud from the first pump and the second pump to the buffer tank.

Specifically, when the first safety valve is opened, the mud recovered to the buffer tank is supplied to the oil base pit, and when the second safety valve is opened, the mud recovered to the buffer tank is returned to the water base pit Is supplied.

A discharge mud recovery line connected to the buffer tank through a movement path of the mud discharged from the first safety valve and the second safety valve; A supply mud recovery line connected from the buffer tank and branched to the oil base pit and the water base pit; And a charge pump for discharging the mud from the buffer tank on the supply mud recovery line.

Specifically, the discharge mud recovery line is connected to the first safety valve and the second safety valve, and is joined to the buffer tank.

The mud system according to the present invention temporarily stores the mud in a buffer tank without having to discharge the mud to the outside even if an emergency such as a sudden high pressure is applied to the first pump or the second pump and then the oil base mud and the water base mud Can be recovered as the oil base pits or the water base pits, which are the respective storage tanks, and waste of the expensive mud can be prevented.

Further, according to the present invention, it is possible to continuously discharge the mud to the buffer tank without needing to stop the system even in an emergency, to enable continuous drilling, and to use part of the recovery line as a common use, By using it as a temporary storage tank of a water base mud, it is possible to simplify the construction and reduce the space required in the hull, which is a limited space, and can efficiently operate the drill ship or semi-rig.

1 is a conceptual diagram illustrating a mud system according to an embodiment of the present invention.
2 is a view showing a route of an oil base mud of a mud system according to an embodiment of the present invention.
3 is a view showing a path of a water base mud of a mud system according to an embodiment of the present invention.
4 is a conceptual view of a mud system according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual view of a mud system according to an embodiment of the present invention. FIG. 2 is a view showing a route of an oil base mud of a mud system according to an embodiment of the present invention, Is a view showing a path of a water base mud of a mud system according to an embodiment of the present invention.

1 to 3, a mud system 100 according to an embodiment of the present invention includes a mud line 110, an oil base pit 120, a water base pit 130, a first pump (not shown) 140, a second pump 150, a pressure relief valve 160, a buffer tank 170, and a charge pump 180.

The mud line 110 serves as a moving path of the mud, and supplies the mud with drilling equipment such as a drill pipe 10, a riser pipe (not shown). Here, the mud prevents the drill bit 11 from being overheated and prevents abnormal high pressure from rising on the drill pipe 10. During the drilling operation, the first pump 140, the second pump 150, Which is fed into the drill pipe 10 and back through the hole in the drill bit 11 through the drill pipe 10 and the riser pipe.

The mud supplied through the mud line 110 is supplied to a well head area provided on the sea floor by passing the drilling equipment and is supplied to the drill bit along with the rock debris generated by the drill bit 11 ) Or a semi-rig (not shown) and circulates.

Here, the drill bit 11 generates a large amount of heat and rock debris during drilling, and a mud circulation method is used to cool the superheated drill bit 11 and efficiently remove rock debris .

A mud circulation system (hereinafter referred to as a mud circulation system) injects a mud made into the drill pipe 10 according to the geological characteristics at a high pressure, passes through the drill bit 11 at the end, And the like.

In the mud circulation system, the mud that has reached the end of the drill bit 11 is injected with a strong pressure from the nozzle, and after the injection is pushed up again through the gap between the wall of the oil well and the drill pipe 10 . At this time, it carries the residues such as excavated soil and rock debris, not just a rise. Drilling through holes in the floor through the force injected by the pressure of the nozzle and bringing the cut residues to the drill (or semi-rig) using the tackiness of the mud allows the drilling to proceed smoothly. In this process, the mud cools and lubricates the superheated drill bit (11) and pushes the rock debris up to high pressure and is sent to the drill (or semi-rig) through the riser pipe. The recovered mud is recycled separately from the rock debris through a special process.

That is to say that the mud will come back with various cuttings caused by the rotation of the drill bit 11, such as rock fragments, gravel, sand, silt, gas, various impurities, do. The mud including various cuts is regenerated by removing various cuts through a shale shaker (not shown) and a sand trap (not shown). The regenerated mud is recovered by the oil base pit 120 or the water base pit described later and pressurized by the first pump 140 or the second pump 150 and supplied into the drill pipe 10 again.

The oil base pit 120 stores the oil base mud supplied in the form of a tank to the mud line 110. Here, the oil base mud is a mixture of oil and mud, which is a kind of mud supplied to the drill bit 11, and is supplied individually (asynchronously) to the water base mud, for example, The supply of the oil base mud is stopped, and when the oil base mud is supplied, the supply of the water base mud is stopped and can be individually supplied and used.

The water base pit 130 stores and supplies the water base mud supplied to the mud line 110 separately from the oil base pit 120 in the form of a tank. Here, the water base mud is a mixture of a water component (sea water and the like) and a mud, and is a kind of mud supplied to the drill bit 11.

In this manner, the oil base pit 120 and the water base pit 130 are separated from each other to form a separate space so that the oil base mud and the water base mud are separated and stored, and the specifications of the mud required by the drill bit 11 The mud is selectively supplied from any one of the oil base pit 120 and the water base pit 130 individually.

The mud line 110 connected to the drilling equipment for moving the mud from the oil base pit 120 and the water base pit 130 to the drilling rig is connected to the oil base pit 120 and the water base pit 130, And can be connected to each other. At this time, a valve (not shown), for example, a three-way valve, is provided on the branching point to adjust the movement path of the mud.

The first pump 140 and the second pump 150 are provided on the mud line 110 and supply the mud to the drilling equipment. The first pump 140 receives the oil base mud 120 from the oil base puddle 120, And the second pump 150 can discharge the water base mud from the water base pit 130.

A valve (not shown) is provided on the mud line 110 between the oil base pit 120 and the first pump 140 to control the flow rate of the mud supplied from the oil base pit 120 Can be adjusted.

A valve (not shown) is also provided on the mud line 110 between the water base pit 130 and the second pump 150 to control the opening degree of the mud supplied from the water base pit 130 The flow rate can be adjusted.

The pressure safety valve 160 is provided on the first pump 140 and the second pump 150 on the mud line 110 so that when a certain pressure is generated in the mud line 110, There is a possibility that the first pump 140 and the second pump 150 may be damaged so that the first pump 140 and the second pump 150 discharge the mud. . Here, the pressure relief valve 160 may be divided into a first safety valve 161 and a second safety valve 162 for convenience's sake.

The first safety valve 161 is provided on the first pump 140 and the second safety valve 162 is provided on the second pump 150 when the abnormal high pressure is generated in the first pump 140, May be provided in the second pump 150 as a construction to be operated upon occurrence of the failure.

Here, by opening the pressure relief valve 160, the mud discharged from the first pump 140 and the second pump 150 can be recovered to the buffer tank 170. The mud (oil base mud) recovered to the buffer tank 170 when the first safety valve 161 is opened is supplied to the oil base pit 120 and the second safety valve 162 is opened, The mud (water base mud) recovered to the buffer tank 170 can be supplied to the water base pit 130.

In the buffer tank 170, the mud on the mud line 110 or the first pump 140 and the mud on the second pump 150 are recovered by opening the pressure relief valve 160. The buffer tank 170 of the present embodiment is one, and the oil base mud and the water base mud are respectively flowed in and out separately. This can be accomplished by separately opening the oil base mud and the water base mud by separate opening of the first safety valve 161 and the second safety valve 162 and individually recovering the oil base mud and the water base mud to the buffer tank 170. The buffer tank 170 is pressurized by the first pump 140 or the second pump 150 when discharged from the oil base pit 120 or the water base pit 130 so that the mud of the increased pressure state is not recovered The pressure of the mud can be reduced and temporarily stored.

2, when the first pump 140 is operated to use the oil base mud to supply the mud from the oil base pit 120, the dotted line indicates the flow path of the mud made of the oil base mud, An abnormal high pressure may be generated on the first pump 140. At this time, the first safety valve 161 is opened so that the oil base mud is recovered to the buffer tank 170 through the discharge mud recovery line 171, and the oil base mud recovered to the buffer tank 170 is returned to the supply mud recovery Line 180A and 181A to be recovered to the oil base pit 120 for reuse. Here, the discharge mud recovery line 171 and the supply mud recovery lines 180A and 181A will be described later.

On the other hand, as shown in FIG. 3 (the dotted line indicates the movement path of the mud made of the water base mud), when the second pump 150 is operated to use the water base mud to receive the mud from the water base pit 130 An abnormal high pressure may be generated on the second pump 150. [ At this time, the second safety valve 162 is opened so that the water base mud is recovered to the buffer tank 170 through the discharge mud recovery line 171, and the water base mud recovered to the buffer tank 170 is returned to the supply mud recovery Can be recovered to the water base pit 130 through the lines 180A and 182A and reused.

Here, the discharge mud recovery line 171 is connected to the buffer tank 170 through the movement path of the mud discharged from the safety valve 160, that is, the first safety valve 161 and the second safety valve 162, A discharge mud recovery line 171 connected from the first safety valve 161 and the second safety valve 162 may be connected to the buffer tank 170. [ In addition, the supply mud recovery lines 180A, 181A, and 182A are connected from the buffer tank 170 and branched to connect to the oil base pit 120 and the water base pit 130.

The charge pump 180 is provided on the supply mud recovery lines 180A, 181A and 182A to discharge the mud from the buffer tank 170 and supply the mud to the oil base pit 120 or the water base pit 130.

That is, the charge pump 180 pressurizes the mud so that the mud is discharged from the buffer tank 170. On the supply mud recovery lines 180A, 181A, and 182A, gate valves 180B, 181B, and 182B And the mud can be recovered by either one of the oil base pit 120 and the water base pit 130 by adjusting the opening degree of the gate valves 180B, 181B and 182B. Here, the gate valves 180B, 181B, and 182B may be operated in conjunction with the first safety valve 161 or the second safety valve 162.

The gate valve 180B between the buffer tank 170 and the charge pump 180 is opened to supply the recovered mud to the oil base pit 120 or the water base pit 130. [ When the first safety valve 161 is opened and the oil base mud is supplied to the buffer tank 170, the oil level of the oil base pits 120 is increased from the charge pump 180 to the oil base feet 120, The gate valve 181B is opened. When the second safety valve 162 is opened and the water base mud is supplied to the buffer tank 170, the charge pump 180 is moved from the charge pump 180 to the water base pit 130 The gate valve 182B is opened.

In this embodiment, when sudden high pressure is applied to the first pump 140 or the second pump 150, the mud is temporarily stored in the buffer tank 170 and then the oil base pit 120 or the water base pit 130 ), And it is possible to prevent the expensive mud from being wasted.

In addition, the mud can be drained into the buffer tank 170 without the need to stop the system in an emergency, thereby enabling a continuous drilling operation. A portion of the discharge mud recovery line 171 and the buffer tank 170 are used in common By simplifying the construction and reducing the space required in the hull, which is a limited space, it is possible to operate drillships and semi-rigs efficiently.

4 is a conceptual view of a mud system according to another embodiment of the present invention. The same or corresponding elements as those of the above-described embodiment will be denoted by the same reference numerals and duplicate descriptions thereof will be omitted.

4, the mud system 200 according to another embodiment of the present invention includes a mud line 110, an oil base pit 120, a water base pit 130, a first pump 140, The second pump 150, the pressure relief valve 160, the buffer tank 170, and the charge pump 180. Here, the present embodiment is different from the discharge mud recovery line 171 of one embodiment.

The discharge mud recovery lines 271A and 272A of the present embodiment may be formed separately from the above described embodiments and may be divided into a first discharge mud recovery line 271A and a second discharge mud recovery line 272A for convenience have. Here, the first discharge mud recovery line 271A is connected from the first pump 140 to the buffer tank 170, and the second discharge mud recovery line 272A is connected from the second pump 150 to the buffer tank 170, .

That is, when the first pump 140 is operated to use the oil base mud to supply the mud from the oil base pit 120, abnormal high pressure may be generated on the first pump 140. In this embodiment, the first safety valve 161 is opened and the oil base mud is recovered to the buffer tank 170 through the first discharge mud recovery line 271A.

On the other hand, when the second pump 150 is operated to use the water base mud to supply the mud from the water base pit 130, abnormal high pressure may be generated on the second pump 150. At this time, the second safety valve 162 is opened, and the water base mud is recovered to the buffer tank 170 through the second discharge mud recovery line 272A.

As described above, in this embodiment, even if a sudden high pressure is applied, it is possible to reuse the expensive mud without draining the expensive mud, and the circulation of the mud can be smoothly performed, and the mud can be efficiently used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Drill pipe 11: Drill bit
100, 200: Mud system 110: Mudline
120: Oil base pit 130: Water base pit
140: first pump 150: second pump
160: pressure safety valve 161: first safety valve
162: second safety valve 170: buffer tank
171: discharge mud recovery line 180: charge pump
180A, 181A and 182A: supply mud recovery lines 180B, 181B and 182B:
271A: first discharge mud recovery line 272A: second discharge mud recovery line

Claims (6)

Mudline to supply mud with drilling equipment;
An oil base foot for storing an oil base mud supplied to the mud line;
A water base pit storing a water base mud supplied to the mud line;
A first pump for discharging the oil base mud from the oil base pit on the mud line;
A second pump for discharging the water base mud from the water base pit on the mud line;
A pressure relief valve provided on the mud line to open the mud when the first pump or the second pump is at a predetermined pressure or more;
A buffer tank for collecting the mud on the mud line by opening the pressure safety valve and collecting the mud on the oil base pit and the water base pit, respectively;
A supply mud recovery line connected from the buffer tank and branched to the oil base pit and the water base pit; And
And a charge pump for discharging the mud from the buffer tank on the supply mud recovery line. The method according to claim 1,
Wherein the oil base pit and the water base pit supply the oil base mud and the water base mud to the mud line in a non-simultaneous manner. The pressure relief valve according to claim 2,
A first safety valve provided in the first pump; And
And a second safety valve provided in the second pump,
And the mud is recovered from the first pump and the second pump to the buffer tank by the pressure relief valve. The method of claim 3,
The mud recovered to the buffer tank when the first safety valve is opened is supplied to the oil base pit and the mud recovered to the buffer tank when the second safety valve is opened is supplied to the water base pit Features a mud system. 5. The method of claim 4,
Further comprising: a discharge mud recovery line connected to the buffer tank through a movement path of the mud discharged from the first safety valve and the second safety valve. 6. The apparatus of claim 5,
Wherein the first and second safety valves are connected to each other and are connected to the buffer tank.

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