KR101475017B1 - Marine structure - Google Patents

Abstract

An offshore structure is disclosed. An offshore structure according to an embodiment of the present invention includes a mud pump for circulating a mud required for drilling; A mud tank for storing and supplying the mud circulated by the mud pump; A main pipe unit connecting the mud pump and the mud tank; A bypass pipe unit which is connected to the main pipe unit and into which a part of the mud transferred through the main pipe unit flows and is moved; And a density measurement unit installed in the bypass pipe unit for measuring the density of the mud moving through the bypass pipe unit.

Description

Marine structure {MARINE STRUCTURE}

The present invention relates to an offshore structure, and more particularly, to an offshore structure capable of measuring the density of a mud transferred through a bypass pipe unit connected to a main pipe unit, thereby improving the accuracy of measurement.

In general, an offshore structure is a structure that is installed on the sea or under the sea. It is classified into fixed type, semi-submerged type, floating type according to depth, and mainly used for marine work such as exploration and extraction of energy source such as oil or natural gas .

Here, the offshore structures are equipped with drilling equipment, etc., and are used to develop underwater oil fields.

On the other hand, due to the increase of oil usage due to industrialization, development of marginal field or deep-sea oil field which is not economically feasible has become economical. With the development of submarine mining technology, And a drill rig equipped with the drill rig has been developed and used.

Here, the drill ship includes various types of ships. For example, it is possible to use a tug boat that can be sailed by another tugboat, and a submarine drilling rig a so-called drill ship has been developed for use in subsea drilling, which is constructed in the same form as a general ship so that it can be equipped with a rig ship, a fixed platform, and advanced drilling equipment and can sail under its own power

At the center of the drill ship, a moonpool can be formed so that drilling pipes drilling oil and gas existing in the basement of the sea floor can be moved up and down and drilled.

The drill bit is drilled on the drill bit to drill the rock, and the drill bit is rotated by the motor to pierce the hole deep in the ground.

Here, when the drill bit penetrates the rock, it becomes extremely hot due to the friction with the rock, and a drilling bit is supplied as a drill bit to cool the hot drill bit.

 Here, the drilling mud is pumped by the mud pump and transported into the drilling pipe, out of the drilling pipe through the hole in the drill bit, and then back up through the inside of the riser along the outside of the drilling pipe.

And, the mud can bring up the rock debris that comes out of drilling together and make it possible to analyze, and the mud can also prevent sudden eruption of oil, water, or gas with pressure.

On the other hand, the mud is circulated through the pump. In order to reuse the mud, the foreign matter mixed in the mud during the circulation process, that is, the sand, silt or gas mixed in the mud generated in the drilling process is removed.

However, the density of the mother can be changed during the removal of foreign matter mixed with the mud, since the mud must have a predetermined range of density in order to maintain the cooling performance of the drill bit, There is a need to accurately measure the density of the mud.

none

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of measuring the density of a mud conveyed through a bypass pipe unit connected to a main pipe unit so as to satisfy a density measurement condition, To provide an offshore structure.

According to an aspect of the present invention, there is provided a mud pump for circulating a mud necessary for drilling; A mud tank for storing and supplying the mud circulated by the mud pump; A main pipe unit connecting the mud pump and the mud tank; A bypass pipe unit connected to the main pipe unit and having a part of the mud conveyed through the main pipe unit being introduced and moved; And a density measurement unit installed in the bypass pipe unit, the density measurement unit measuring the density of the mud moving through the bypass pipe unit.

In addition, the bypass pipe unit may be formed to be inclined with respect to the center axis of the cross section of the main pipe unit.

A filter unit may be installed at a connecting portion between the bypass pipe unit and the main pipe unit to prevent foreign matter mixed in the mud from entering the bypass pipe unit.

Further, the density measurement unit may be provided in a radiation density meter capable of nondestructive measurement.

The density measurement unit may include a flow rate measurement unit capable of measuring a flow rate of the mud moving through the main pipe unit or the bypass pipe unit; And a controller for controlling power supply and cutoff of the radiation density meter according to a flow rate of the mud measured from the flow rate measurement unit.

Also, the bypass pipe unit may have a straight pipe portion, and the length of the straight pipe portion may be at least three times the diameter of the bypass pipe unit.

The diameter of the bypass pipe unit may be smaller than the diameter of the main pipe unit.

Further, the bypass pipe unit may be disposed below the main pipe unit so that the mud can be moved from the main pipe unit to the bypass pipe unit.

A valve for maintaining or repairing the bypass pipe unit may be installed in the bypass pipe unit.

Embodiments of the present invention measure the density of the mud transferred through the bypass pipe unit connected to the main pipe unit so as to satisfy the measurement condition of density, thereby improving the accuracy of the measurement .

1 is a view showing a general drilling drilling process.
2 is a schematic view of an apparatus for measuring mud density among marine structures according to a first embodiment of the present invention.
3 is a view showing a slope formed in the bypass pipe unit in the apparatus for measuring mud density among marine structures according to the first embodiment of the present invention.
4 is a view showing a valve installed in a bypass pipe unit in an apparatus for measuring mud density among marine structures according to the first embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 1 is a view showing a general drilling process, FIG. 2 is a schematic view of an apparatus 100 for measuring a mud density among marine structures according to a first embodiment of the present invention, FIG. FIG. 4 is a view showing a slope formed in a bypass pipe unit 500 in an apparatus 100 for measuring a mud density of an offshore structure according to an embodiment of the present invention. And a valve 520 is installed in the bypass pipe unit 500 in the apparatus 100. FIG.

As shown in these figures, an offshore structure according to the present embodiment includes a mud pump 200 for circulating a mud 910 required for drilling, and a mud pump 910 for storing and supplying mud 910 circulated by the mud pump 200. [ A main pipe unit 400 connecting the mud pump 200 and the mud tank 300 and a main pipe unit 400 connected to the main pipe unit 400 and connected to the main pipe unit 400, A bypass pipe unit 500 in which a part of the mud 910 is introduced and moved and a density measuring unit 910 installed in the bypass pipe unit 500 and measuring the density of the mud 910 moving through the bypass pipe unit 500 And a density measurement unit 600.

In the present specification, the term 'offshore structure' refers to various structures installed on the sea or under the sea. However, for convenience of explanation, it will be explained about a drilling ship 900.

1 and 2, a mud density measuring apparatus 100 is provided to measure the density of a mud necessary for drilling, which is installed in an offshore structure, that is, a drill ship 900. The mud density measuring apparatus 100 includes a mud pump 200, A main pipe unit 400, a bypass pipe unit 500, and a density measurement unit 600. The main pipe unit 400, the bypass pipe unit 500,

1 and 2, the mud pump 200 is installed in the drill ship 900 and is provided to circulate the mud 910 required for drilling.

That is, the mud 910 is supplied to the side of the drill bit 930 where the heat is generated, in order to cool the heat generated when drilling the ground of the seabed using the drill bit 930 rotated by the motor 920 Where the mud pump 200 provides pressure to the mud 910 to return to the drill ship 900 after the mud 910 has been transported to the drill bit 930 through the pipe.

The mud 910 transferred by the mud pump 200 to the drill bit 930 is mixed with foreign substances such as sand, silt or gas which may be generated in the ground during drilling, The foreign material should be removed in order to use the mud 910 again.

Here, the mud 910 in which the foreign substances are mixed passes through the filter or the shale shaker 310 removes the foreign matter of a relatively large particle, and the foreign matter of a relatively small particle is removed from the mud tank 300, And can be removed.

Referring to Figures 1 and 2, the mud tank 300 is provided to store and supply the mud 910 that is circulated by the mud pump 200.

That is, the mud pump 900 is temporarily stored in the mud tank 300 by the mud pump 200 and returned to the mud tank 300, and then supplied again to the drill bit 930 side.

Here, the mud tank 300 not only temporarily stores the returned mud 910 but also cools the heat transferred from the drill bit 930 in the process of cooling the drill bit 930, ). ≪ / RTI >

The mud tank 300 may be provided to be able to mix or charge the mud 910 when the density of the mud 910 is reduced below a preset range and to be replaceable with a new mud 910 have.

Referring to FIG. 2, the main pipe unit 400 connects the mud pump 200 and the mud tank 300, and a mud 910, which is supplied with pressure by the mud pump 200, To the drill bit (930) via the mud tank (300), and then returned to the mud tank (300).

Here, the main pipe unit 400 may be provided with various kinds of pipes through which the mud 910 can be moved.

Referring to FIG. 2, the bypass pipe unit 500 is connected to the main pipe unit 400, and a part of the mud 910 to be transferred through the main pipe unit 400 is introduced to be moved.

Here, the reason why the bypass pipe unit 500 is installed in the main pipe unit 400 is that the fluid is supplied from the inside of the pipe to the outside of the pipe to accurately measure the density of the fluid delivered through the pipe, It is necessary to fill the inside of the pipe. In the case of the main pipe unit 400, since the mud 910 is the main passage to which the main pipe unit 400 is fed, the mud 910 flowing through the main pipe unit 400 ) Accurate measurement data of the density may not be guaranteed.

The bypass pipe unit 500 connected to the main pipe unit 400 is installed and the mud 910 transferred through the bypass pipe unit 500 is filled in the bypass pipe unit 500 The diameter of the bypass pipe unit 500 may be smaller than the diameter of the main pipe unit 400 so as to maintain the pipe.

The bypass pipe unit 500 is disposed at a lower portion of the main pipe unit 400 so that the mud 910 conveyed through the main pipe unit 400 can be easily moved to the bypass pipe unit 500 by gravity .

When the bypass pipe unit 500 is disposed at the lower portion of the main pipe unit 400, not only the mud 910 transferred through the main pipe unit 400 but also foreign matter is moved to the bypass pipe unit 500 .

3, the bypass pipe unit 500 includes a main pipe unit 400 and a bypass pipe unit 500. The bypass pipe unit 500 includes a main pipe unit 400 and a bypass pipe unit 500. In order to prevent the foreign matter from moving from the main pipe unit 400 to the bypass pipe unit 500, A slope &thetas; may be formed with respect to the axis 410. [

That is, since the foreign matter is deposited on the bottom of the main pipe unit 400, foreign matter can be prevented from flowing into the bypass pipe unit 500 in which the inclination (?) Is formed from the bottom of the main pipe unit 400 .

In order to more reliably prevent foreign matter mixed in the mud 910 from flowing into the bypass pipe unit 500, the filter unit 500 is connected to the connecting portion of the bypass pipe unit 500 and the main pipe unit 400, (510) may be installed.

Here, the filter unit 510 may be of various kinds of known filters, and may be composed of multiple filters as required.

Referring to FIG. 2, the density measurement unit 600 is installed in the bypass pipe unit 500 and is provided to measure the density of the mud 910 moved through the bypass pipe unit 500.

As described above, since the mud 910 can be kept in the full pipe state inside the bypass pipe unit 500, accurate measurement of the density of the mud 910 becomes possible.

Here, the density measurement unit 600 may be provided with a radiation density meter capable of nondestructive measurement. However, the density measurement unit 600 is not limited to this, and may include a meter mounted inside the bypass pipe unit 500 and measuring density through vibration.

When the density measuring unit 600 is provided in the radiation density meter, the density measuring method uses scattering of photons, that is, photons, emitted using the radiation.

That is, the photons emitted from the light source collide with the particles of the mud 910 while they pass through the mud 910 and reach the detector after they are scattered or absorbed. At this time, the number of photons of the mud 910 The density can be measured.

When the density measurement unit 600 is provided as a radiation density meter, the measurement medium is a radioactive material. Therefore, when the density of the mud 910 is not measured, the density measurement unit 600 is turned off, As shown in Fig.

To this end, the main pipe unit 400 or the bypass pipe unit 500 is equipped with a flow rate measurement unit 700 capable of measuring the flow rate of the mud 910, and the flow rate measurement unit 700 includes a control unit 800, Lt; / RTI >

When the control unit 800 determines that the mud 910 does not flow through the main pipe unit 400 or the bypass pipe unit 500 after receiving the measurement result of the flow measurement unit 700, And when it is determined that the mud 910 flows through the main pipe unit 400 or the bypass pipe unit 500, power is supplied to the radiation density meter.

Meanwhile, the bypass pipe unit 500 may have a straight pipe portion, and the length of the straight pipe portion may be at least three times the diameter of the bypass pipe unit 500.

In general, in order to improve the accuracy of flow measurement, the flow meter should be provided with a straight pipe section having a predetermined range based on the installation place.

To this end, the bypass pipe unit 500, which is provided to measure the density of the mud 910, is also provided with a predetermined straight pipe section, and the length thereof may be three times or more the diameter of the bypass pipe unit 500 .

Referring to FIG. 4, the bypass pipe unit 500 may be provided with a valve 520 for maintenance or repair of the bypass pipe unit 500.

That is, after the bypass pipe unit 500 is closed through the operation of the valve 520 to block entry of the mud 910, the bypass pipe unit 500 is replaced or the inside of the bypass pipe unit 500 Can be cleaned. Here, the valve 520 may be provided in various types, and in particular, a ball valve may be used.

Further, the bypass pipe unit 500 may be provided with a flange for flushing. Here, flushing may mean cleaning the inside of the five, or may mean removing foreign matter remaining in the mud 910. [

Hereinafter, the operation and effect of the marine structure according to the first embodiment of the present invention will be described. In this case, the marine structure, that is, the drill ship 900 may be provided with a mud density measuring apparatus 100 provided to measure the density of the mud required for drilling.

1 and 2, the mud 910 circulated by the mud pump 200 is transferred to the drill bit 930 through the main pipe unit 400 through the mud tank 300, And returned to the tank 300.

Here, the bypass pipe unit 500 is connected to the main pipe unit 400. Since the diameter of the bypass pipe unit 500 is smaller than the diameter of the main pipe unit 400, the mud 910 is bypassed It is possible to maintain the full pipe state inside the pipe unit 500.

A density measurement unit 600 is installed in the bypass pipe unit 500 and the density measurement unit 600 measures the density of the mud 910 flowing through the bypass pipe unit 500.

That is, since the density of the mud 910 flowing in the bypass pipe unit 500 in which the full pipe state is maintained is measured, the measurement accuracy of the density of the mud 910 is improved.

Here, the density measuring unit 600 may be provided with a radiation density meter capable of nondestructive measurement. When the density of the mud 910 is not measured, the flow rate measuring unit 700 may be provided, And a control unit 800.

That is, the flow rate measurement unit 700 measures the flow rate of the mud 910 moving through the main pipe unit 400 or the bypass pipe unit 500 and transmits the measurement value to the control unit 800, Cuts off the power supply of the radiation density meter when it is determined that the mud 910 does not flow through the measurement value of the flow rate transmitted from the flow measurement unit 700. [

Thereby, since the radiation density meter is not used while the mud 910 does not flow, the radiation generation amount can be reduced.

Meanwhile, the bypass pipe unit 500 is provided with a valve 520 to replace the bypass pipe unit 500 or to clean the inside of the bypass pipe unit 500.

Hereinafter, a marine structure having the mud density measuring apparatus 100 will be described in general.

As described above, the offshore structure refers to various structures installed on the sea or the sea floor. In particular, the drill ship 900 includes various vessels capable of performing an underwater drilling operation.

Here, the above-described mud density measuring apparatus 100 is mounted on the offshore structure, and the density of the mud 910 required for drilling is measured using the mud density measuring apparatus 100.

Thereby, the accuracy of measurement of the density of the mud 910 can be improved.

Then, the mixing of the mud 910 or the charging of the mud 910 is performed based on the measurement data of the density of the mud 910 measured through the mud density measuring device 100, and the thus mixed or charged mud 910 Is conveyed to the drill bit 930 to perform the cooling action of the drill bit 930. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: Mud density measuring device 200: Mud pump
300: Mud tank 310: Shale shaker
400: main pipe unit 410:
500: bypass pipe unit 510: filter unit
520: valve 600: density measuring unit
700: flow rate measurement unit 800:
900: Slipway 910: Mud
920: Motor 930: Drill bit

Claims (9)

A mud pump circulating the mud required for drilling;
A mud tank for storing and supplying the mud circulated by the mud pump;
A main pipe unit connecting the mud pump and the mud tank;
A bypass pipe unit connected to the main pipe unit and having a part of a mud conveyed through the main pipe unit is introduced and moved so that the mud moved from the main pipe unit is maintained in a full state; And
And a density measurement unit installed in the bypass pipe unit for measuring a density of the mud moving through the bypass pipe unit,
The density measuring unit is provided with a radiation density meter capable of nondestructive measurement,
The density measuring unit includes:
A flow measurement unit capable of measuring a flow rate of a mud moving through the main pipe unit or the bypass pipe unit; And
And a control unit for controlling power supply and interruption of the radiation density meter according to the flow rate of the mud measured from the flow measurement unit. The method according to claim 1,
Wherein the bypass pipe unit is formed to be inclined with respect to a center axis of a cross section of the main pipe unit. The method according to claim 1,
Wherein a filter unit is installed at a connecting portion between the bypass pipe unit and the main pipe unit to prevent foreign matter mixed in the mud from being introduced into the bypass pipe unit. delete delete The method according to claim 1,
Wherein the bypass pipe unit has a straight pipe portion and the length of the straight pipe portion is at least three times the diameter of the bypass pipe unit. The method according to claim 1,
Wherein the diameter of the bypass pipe unit is smaller than the diameter of the main pipe unit. The method according to claim 1,
Wherein the bypass pipe unit is disposed below the main pipe unit so that the mud can be moved from the main pipe unit to the bypass pipe unit. The method according to claim 1,
Wherein the bypass pipe unit is provided with a valve for maintenance or repair of the bypass pipe unit.

Images