KR20170124717A - Separator for multiphase mixture - Google Patents

Abstract

Disclosed is a separator for a multiphase mixture. According to an embodiment of the present invention, the separator for a multiphase mixture comprises: a separation tank which is connected with an inflow line in which a multiphase mixture flows and in which the flowing multiphase mixture is separated into gas, oil and water by a difference in specific gravity; a partition member arranged in the separation tank, preventing the water separated in the separation tank from flowing into an oil discharge unit and having at least one penetration hole formed on an oil contact area in contact with the oil separated in the separation tank.

Description

Separator for multiphase mixture [

The present invention relates to a multiphasic mixture separation apparatus.

With the rapid development of industries and industries internationally, the use of earth resources such as petroleum is gradually increasing, and thus the stable production and supply of crude oil is emerging as an important issue on a global scale.

For this reason, recently marginal field or deep-sea oil development has been economically feasible, which has been neglected due to economic difficulties so far. Therefore, with the development of submarine mining technology, drilling facilities suitable for the development of such oilfields A floating type of offshore structure has been developed.

In other words, conventional seabed drilling is mainly used for a rig ship or a rigid platform for underwater drilling, which is capable of navigating only by another tug ship, Recently, it has developed so-called Floating Production Storage Off-loading Vessels (FPSO), which is equipped with advanced drilling equipment and built in the same shape as a general ship so that it can navigate with its own power. It is used for drilling underwater.

Floating Crude Oil Production Storage and Handling Facility (FPSO) classifies and refines well fluids extracted from offshore plants and drillships to produce crude oil and store it to shuttle tankers Tanker or other special ship capable of being unloaded at the transfer site.

This floating crude oil production storage and unloading facility (FPSO) is composed of a lower hull structure (Hull) that functions as a storage facility and a topsides that produces and processes crude oil. Depending on storage capacity, Small size, between 100 and 1.5 million barrels, between 150 and 200 million barrels, and over 2 million barrels.

On the other hand, the floating oil production storage and unloading facility is equipped with a separating device for separating the oil jetted mixture ejected from the oil well. An oil well jet mix is a multiphase mixture of water, oil, gas, and sand.

Such a separation apparatus separates the oil-gas mixture into an oil component and a water component by using the specific gravity difference. That is, the oil-in-water mixture supplied to the separation device is separated into oil component and water component in the interior of the separation device over time, and the separated oil components are separated by the difference in specific gravity with respect to the water component .

However, if a surge occurs in which the jet pressure increases sharply in the process of jetting the oil jet blast mixture from the oil well, an excessive amount of the oil jet blast mixture may instantaneously flow into the separation device. In this case, there is a problem that the function of the separating device is difficult to exhibit properly.

An embodiment of the present invention is intended to provide a polyphase mixture separating device that exhibits its function even in the occurrence of surge.

According to an aspect of the present invention, there is provided a separation tank, comprising: a separation tank connected to an inflow line through which a polyphase mixture flows, wherein the introduced polyphase mixture is separated into gas, oil and water by a specific gravity difference; Wherein the oil separating tank is disposed inside the separating tank so that the separated water in the separating tank is prevented from flowing into the oil discharging portion and at least one first through hole is formed in the oil contacting region in contact with the oil separated in the separating tank, ; And opening and closing means for opening and closing the first through-hole, may be provided.

The apparatus for separating polyphase mixture comprises: a pressure sensor for sensing an internal pressure of the inflow line; And a controller for receiving the sensing signal from the pressure sensor and controlling the opening and closing means so that the first through hole is opened when the sensed value exceeds a set value.

The opening and closing means includes a lifting member having a second through-hole corresponding to the first through-hole, the lifting member being capable of being elevated and lowered on the partitioning member; And a driving unit for providing a driving force for moving the elevating member up and down.

The partition member may be formed with a sliding groove into which the elevating member is inserted to allow sliding movement.

The driving unit may include a cylinder supported by a bottom surface of the sliding groove and lifting the elevating member in an expanding and contracting operation.

The pressure sensor may be located on a curved portion of the mixture inflow line.

The control unit may control the opening and closing unit so that the first through-hole is closed when the set time passes after the detection value exceeds the set value and the first through-hole is opened.

According to the embodiment of the present invention, the oil separated in the separation tank is discharged to the outside of the separation tank in advance before the large amount of the polyphase mixture is introduced into the separation tank when the surge occurs, thereby securing sufficient space for separation, Even when the polyphase mixture is introduced into the separation tank, it can be sufficiently separated by water and oil.

1 is a view showing an installation state of a polyphase mixture separating apparatus according to an embodiment of the present invention,
2 is a view showing a part of the apparatus for separating a polyphase mixture according to an embodiment of the present invention,
Fig. 3 is a view showing an internal section of a portion B in Fig. 2,
4 is a view showing the direction of the arrow in the CC line of Fig. 3,
Fig. 5 is an enlarged view of the inside of part A in Fig. 1,
6 is a view showing a part of the apparatus for separating a polyphase mixture according to an embodiment of the present invention,
7 and 8 are views for explaining the operation of the apparatus for separating polyphase mixture according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, do.

FIG. 2 is a view showing a part of the apparatus for separating polyphase mixture according to an embodiment of the present invention, and FIG. 3 is a cross- FIG. 4 is an enlarged view of the inside of a portion A in FIG. 1, and FIG. 6 is an enlarged view of the inside portion B of FIG. 1 is a view showing a part of a polyphase mixture separating apparatus according to an embodiment. 2 to 4, the X-axis direction refers to the longitudinal direction of the separation tank 110, the Y-axis direction refers to the width direction of the separation tank 110, and the -X direction refers to the longitudinal direction of the separation tank 110 It means forward.

Referring to FIG. 1, a multiphase mixture separation apparatus may be installed in a floating crude oil production storage and unloading facility (FPSO) 10. The polyphase mixture containing oil is ejected from the seabed well 30 located at the seabed and the ejected polyphase mixture can be introduced into the separation tank 110 through the inflow line 105 and separated.

2 to 6, the polyphase mixture separating apparatus 100 includes a separating tank 110, a partitioning member 120, an opening / closing unit 140, a pressure sensor 150, a controller 160, .

Referring to FIG. 2, the polyphase mixture flows into the separation tank 110. The polyphase mixture introduced into the separation tank 110 is introduced and the introduced polyphase mixture can be separated into gas, oil and water by the specific gravity difference.

For example, the polyphase mixture introduced into the separation tank 110 can be separated so that the water having a relatively large specific gravity is located below the water, the oil having the next largest specific gravity is placed thereon, and the gas having the lowest specific gravity is positioned at the top.

The polyphase mixture may be a well jetted mixture ejected from a seabed well (30 in FIG. 1) and may include water, oil, gas, sand, and the like.

The polyphase mixture flowing into the separation tank 110 moves in the longitudinal direction of the separation tank 110 and can be separated into gas, oil and water.

The separation tank 110 may be connected to the inflow line 105. The rear end of the inflow line 105 may be disposed at the front portion of the separation tank 110. The polyphase mixture can be introduced into the separation tank 110 through the inlet line 105. In the separation tank 110, a momentum damping unit 132 may be installed at a rear end of the inflow line 105.

The momentum damping unit 132 attenuates the kinetic energy of the polyphase mixture flowing into the separation tank 110 through the inflow line 105.

For example, when the polyphase mixture flows into the momentum damping part 132, the polyphase mixture collides with the inner side of the momentum damping part 132, so that kinetic energy can be attenuated. In this process, some gases can be separated from the polyphase mixture by impact. The separated gas flows into the upper portion of the inner space of the separation tank 110.

When the polyphase mixture whose momentum is attenuated by the momentum damping unit 132 flows into the separation tank 110, the flow inside the separation tank 110 can be stabilized. The polyphase mixture can be effectively separated.

The oil separator 134 may be formed in the separation tank 110. The separated oil in the separation tank 110 may be discharged to the outside through the oil discharge portion 134.

The oil discharge portion 134 may be formed at a rear portion of the separation tank 110. The oil drain 134 is preferably located remote from the inflow line 105. In this case, the moving distance of the polyphase mixture flowing into the separating tank 110 is increased, so that the separation time can be increased.

The separation tank 110 may be provided with a gas discharge portion 136. The separated gas in the separation tank 110 may be discharged to the outside through the gas discharge portion 136. A mist extractor 137 may be installed at the tip of the gas discharge part 136. The gas in the separation tank 110 may be discharged through the gas discharge unit 136 in a state in which moisture is removed from the water extractor 137.

A water discharge portion 138 may be formed in the separation tank 110. The separated water in the separation tank 110 can be discharged to the outside through the water discharge portion 138.

The partitioning member 120 may be disposed inside the separating tank 110. The partitioning member 120 blocks the separated water from flowing into the oil discharge portion 134.

2, the left side of the partitioning member 120 is referred to as a right side, and the right side of the partitioning member 120 is referred to as a left side. It is called Europium.

The partition member 120 prevents water in the separation zone from entering the oil space. This partitioning member 120 can be formed higher than the water level in the separation zone. That is, the upper end of the partition member 120 may be positioned higher than the water surface of the water in the separation area.

When the polyphase mixture continuously flows into the separation tank 110, the amount of oil in the separation zone continuously increases, so that the oil in the separation zone can eventually flow into the oil zone beyond the partition member 120. The oil introduced into the oil space can be discharged to the outside through the oil discharge portion 134.

The partitioning member 120 may have a plate shape, but is not limited thereto.

Referring to FIGS. 2 to 4, at least one first through-hole 121 may be formed in the oil-contact area of the partitioning member 120 in contact with the separated oil in the separation tank 110.

The oil separated in the separation tank 110 can be introduced into the oil space through the first through hole 121 when the first through hole 121 is opened. When the first through hole 121 is closed, May be introduced into the oil compartment beyond the inlet 120.

The opening and closing means 140 opens and closes the first through-hole 121.

In this embodiment, the opening and closing means 140 may include the elevating member 141 and the driving unit 143. [

The elevating member 141 can be coupled to the partitioning member 120 to be movable up and down. For example, the partition member 120 may be formed with a sliding groove 123 through which the elevating member 141 is inserted to allow sliding movement. The partitioning member 120 is inserted into the sliding groove 123 and can move up and down in the vertical direction.

The elevating member 141 may have a second through-hole 142 corresponding to the first through-hole 121.

In the ascending and descending process of the lifting member 141, the first through-hole 121 and the second through-hole 142 may be arranged in a line, although they are not arranged in a shifted manner as shown in FIG. 3 and FIG.

3 and 4, when the first through-hole 121 and the second through-hole 142 are shifted from each other, the first through-hole 121 is closed so that the oil separated in the separating tank 110 passes through the first through- The oil does not flow into the oil space through the opening 121.

The first through hole 121 and the second through hole 142 are not shown but when the first through hole 121 and the second through hole 142 are aligned in a line, the first through hole 121 is opened, Through the second through-hole 121 and the second through-hole 142. In this case, the oil level of the oil in the separation zone can be rapidly lowered. This will be described later.

The driving unit 143 can provide a driving force for moving the lifting member 141 up and down. For example, the driving unit 143 may include a cylinder 143a. The cylinder 143a is supported on the bottom surface of the sliding groove, so that the elevating member 141 can be moved up and down during the expansion and contraction operation.

Referring to FIGS. 5 and 6, the pressure sensor 150 may sense the internal pressure of the inflow line 105. For example, the pressure sensor 150 may be positioned on the curved portion 105a of the attracting line 105 as shown in FIG. The curved portion 105a is a portion where the moving direction of the polyphase mixture moving along the attracting line 105 is abruptly changed. When the pressure sensor 150 is disposed on the curved portion 105a, a sudden pressure rise Lt; / RTI >

The control unit 160 receives the detection signal from the pressure sensor 150 and can control the opening / closing unit 140 so that the first through-hole (121 of FIG. 3) is opened when the sensed value exceeds the set value. Here, the set value can be determined as the maximum value of the pressure range inside the inflow line 105 when it is experimentally and empirically normal.

For example, if the pressure inside the normal inflow line 105 during the movement of the polyphase mixture through the inflow line 105 experimentally and empirically is 9.5 to 10.5 bar, the above set value can be determined to be 10.5 bar.

When the sensed value exceeds the set value, the controller 160 determines that a surge has occurred and controls the opening / closing unit 140 to open the first through hole 121 (FIG. 3). At this time, the oil separated in the separation tank (2, 110) rapidly flows into the oil space through the first through hole (121 in FIG. 3), and the oil level in the separation area can be rapidly lowered.

The control unit 160 controls the system wastewater 140 so that the first through hole is opened beyond the set value and then the opening and closing means 140 Can be controlled. This will be described later.

7 and 8 are views for explaining the operation of the apparatus for separating polyphase mixture according to an embodiment of the present invention. Hereinafter, the operation of the apparatus for separating polyphase mixture according to this embodiment will be described with reference to FIGS. 2, 7, and 8. FIG.

First, referring to FIG. 2, when the polyphase mixture normally flows into the separation tank 110, the first through-hole 121 can be kept closed. At this time, the polyphase mixture introduced into the separation tank 110 is separated into water, oil and gas, and the separated oil can be discharged to the outside of the separation tank 110 through the partitioning member 120.

Referring to FIG. 7, when a surge occurs, the first through hole 121 can be opened. 6) receives the sensed value sensed by the pressure sensor 150 (FIG. 6), and based on the sensed value, the control unit (160 of FIG. 6) Can be controlled. The control unit 160 may control the driving unit 143 so that the first through-hole 121 and the second through-hole 142 of the elevating member 141 are arranged in a line.

When the first through-hole 121 is opened, the oil separated in the separation tank 110 quickly flows into the oil space through the first through-hole 121, so that the oil level in the separation area can be rapidly lowered.

Referring to FIG. 8, when the set time passes after the first through-hole 121 is opened by the surge, the first through-hole 121 can be closed. 6), the control unit (160 of FIG. 6) controls the system wastewater 140 so that the detection value of the pressure sensor (150 of FIG. 6) exceeds the set value and the first through- It is possible to control the opening / closing means 140 so that the first through-hole 121 is closed.

At this time, since there is a sufficient height difference between the upper end of the partitioning member 120 and the inner surface of the separation zone, even if a large amount of the polyphase mixture due to the surge flows into the separation tank 110, the separation of the polyphase mixture have.

The set time at which the first through-hole 121 is closed can be determined experimentally or empirically in consideration of the time taken until a large amount of the polyphase mixture reaches the separation tank 110 after the occurrence of the surge.

The polyphase mixture separating apparatus 100 according to the present embodiment as described above is capable of separating the oil separated in the separating tank 110 before the polyphase mixture is introduced into the separating tank 110, So that a large amount of the polyphase mixture due to the surge can be sufficiently separated from the separation tank 110 by water and oil.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, many modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

100: Multiphase mixture separator
105: Inflow line
110: Separation tank
120: partition member
132: momentum damping unit
134: Oil discharge portion
136:
137: Water extractor
138:
140: opening / closing means
141:
143:
150: Pressure sensor
160:

Claims (6)

A separation tank connected to the inflow line through which the polyphase mixture flows and the inflow polyphase mixture separated into gas, oil and water by a specific gravity difference;
Wherein the oil separating tank is disposed inside the separating tank so that the separated water in the separating tank is prevented from flowing into the oil discharging portion and at least one first through hole is formed in the oil contacting region in contact with the oil separated in the separating tank, ; And
And opening / closing means for opening / closing the first through-hole. The method according to claim 1,
A pressure sensor for sensing an internal pressure of the inflow line; And
Further comprising a control unit for receiving the detection signal from the pressure sensor and controlling the opening and closing means so that the first through-hole is opened when the sensed value exceeds a set value. 3. The method of claim 2,
The opening /
A lifting member having a second through-hole corresponding to the first through-hole and being movably coupled to the partition member; And
And a driving unit for providing a driving force for moving the elevating member up and down. The method of claim 3,
The driving unit includes:
And a cylinder for moving the elevating member up and down. 3. The method of claim 2,
The pressure sensor includes:
Wherein the mixture inlet line is located on a curved portion of the mixture inlet line. 3. The method of claim 2,
Wherein,
And controls the opening / closing means so that the first through-hole is closed when the set time passes after the opening / closing means is controlled so that the detection value exceeds the set value and the first through-hole is opened.

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