KR20140077384A - Produced water de-sander system - Google Patents

Abstract

The present invention relates to a produced water de-sander system, and more particularly, to a method and apparatus for separating sand and slurry mixed with crude oil before purification of drilled crude oil to prevent the equipment for crude oil purification from failing, Sander system, which is provided as a vertical type constituting the water-sander system, thereby improving the installation space efficiency.
To this end, an oil reservoir in which gas, oil, and produced water are separated and stored using a specific gravity of crude oil drilled from the seabed, comprising: a supply passage through which the produced water is supplied from the oil reservoir; A plurality of centrifugal separators connected to the supply flow channel for centrifugally separating the produced water, an accumulator disposed below the centrifugal separator for storing sand separated from the centrifugal separator, an accumulator disposed below the accumulator, A plurality of first vertical channels formed in each of the centrifuges and forming a channel through which the sand is dropped by an accumulator, a collecting channel provided between the plurality of first vertical channels and the accumulator, An automatic valve provided in each of the first vertical flow passages, and a second valve disposed between the accumulator and the tray, And a second vertical flow passage for forming a channel through which sand is dropped.

Description

&Quot; Produced water de-sander system "

The present invention relates to a produced water system, and more particularly, to a produced water de-sander system capable of separately processing sand and slurry contained in drilling crude oil.

As the international phenomenon of industrialization and industry develops, the use of resources such as petroleum is gradually increasing, and thus the stable production and supply of oil is becoming a very important issue on a global scale.

For this reason, the development of the marginal field or deep-sea oil field, which had been neglected due to economic difficulties, has become economic in recent years.

Therefore, along with the development of seabed mining technology, drilling rigs with drilling facilities suitable for the development of such oilfields have been developed.

Conventional submarine drilling can only be carried out by other tugboats, and a rig ship or a fixed platform for subsea drilling that performs submarine drilling operations with anchorage at one point of the sea using a mooring device is mainly used Recently, floating aquatic structure (FPSO) has been developed and installed in the same form as general ship so that it can be equipped with advanced drilling equipment and can navigate by its own power. It is used for submarine drilling and crude oil refining.

On the other hand, when the drilling operation is completed, as shown in FIG. 1, the FPSO 10, which is a floating offshore structure, lifts crude oil from the sea floor and performs refining process, and then transports the refined crude oil to the land.

The FPSO 10 refers to a facility that receives gas or crude oil from a drilled undersea and processes it before it is transported through a ship or pipeline.

On the other hand, the crude oil transferred to the FPSO 10 contains foreign matter, and most of the foreign matter is sand.

In other words, not only crude oil but also the sand around the seabed are inhaled during the process of raising the crude oil.

In particular, in sandy terrain waters, the proportion of sand contained in crude oil is substantial.

Accordingly, it is important to remove the sand contained in the crude oil before purifying the crude oil, in order not to damage the equipment of the purification module equipped with the equipment for purifying the crude oil.

That is, if crude oil without sand removal flows directly into the equipment of the refining module, the equipment of the refining module may be buried in sand during the refining process for the crude oil, which may cause serious damage.

Conventionally, there is no precise standard for separating sand from crude oil, and equipment for separating sand from crude oil has not been provided.

As a result, the work efficiency for maintenance of the refining module is increased and the efficiency of the operation is decreased.

Therefore, there is a demand for equipment for efficiently separating sand from crude oil drilled from the sea floor.

Korea Pub. No. 10-2012-0008844

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a process for separating oil- Sander system that allows simple control of the separation operation to be performed by the user.

In order to achieve the above-mentioned object, the present invention provides an oil reservoir in which crude oil, which is drilled from the sea floor, is separated and stored by using specific gravity gas, oil, and produced water, A plurality of centrifuges connected to the supply passage for centrifugally separating the produced water, an accumulator installed below the centrifugal separator for storing sand separated from the centrifugal separator, A plurality of first vertical flow paths provided in each of the centrifugal separators and forming a channel through which the sand is dropped by the accumulator, and a plurality of second vertical flow paths provided between the plurality of first vertical flow paths and the accumulator A first collecting flow path provided in each of the first vertical flow paths, And a second vertical flow path provided between the trays and forming a channel through which sand is dropped by its own weight.

At this time, it is preferable that a centrifugal oily water and a liquid flow path through which gas is discharged are installed on the upper part of the centrifugal separator.

In addition, it is preferable that a liquid for decelerating the flow rate of the sand discharged from the centrifugal separator is stored in the accumulator.

Further, it is preferable that the centrifuges are arranged in parallel.

The centrifugal separator may further include a water level sensor for sensing the level of the produced water flowing through the supply channel.

The produced water de-sander system according to the present invention has the following effects.

First, by separating the produced sand from the oil extracted from the oil well, the offshore oil and gas production, which is the refining module of FPSO, can be operated for a long time to prevent the equipment from being damaged by foreign matter including sand. There is an effect that can be.

Thus, the quality of refined crude oil can be increased, and maintenance and maintenance costs for the equipment can be reduced.

Second, it has two centrifuges to increase efficiency of separating crude oil and install only one accumulator, thus simplifying control work.

Figure 1 is a side view of a floating offshore structure (FPSO)
2 is a configuration view of a produced water de-sander system according to a preferred embodiment of the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, a produced water de-sander system (hereinafter, referred to as a "de-sander system") according to a preferred embodiment of the present invention will be described with reference to FIG.

Crude oil drilled from the bottom of the seabed includes oil, gas and seawater.

This crude oil is stored in an oil reservoir, and then separates each fluid primarily using specific gravity.

That is, produced water is produced at the bottom of the reservoir and oil, gas and so on are placed on the top of the produced water.

At this time, the oil and gas are discharged to a separate place provided on one side of the oil reservoir.

Meanwhile, the produced water remaining in the oil reservoir contains sand drilled from the sea floor and various slurries, and the sand and slurry must be separated and treated.

These sand and slurries not only damage various equipments, but they can also affect the environmental pollution because they are oiled.

As a result, the produced water is separated from the sand and slurry by using a desalter system installed on the top side of the offshore structure.

The Desander system has the technical feature of separating solid particles, such as sand and slurry, from the produced water into separate disposal sites.

2, the desalter system includes a supply passage 100, a centrifugal separator 200, an accumulator 300, a tray 400, a vertical passage 500, and a collecting passage 600 .

The supply channel 100 is a channel through which the produced water separated from the oil reservoir is supplied to the centrifugal separator 200.

At this time, a valve 110 for opening and closing the channel of the supply passage 100 is provided on the supply passage 100.

Next, the centrifugal separator 200 separates the sand and the slurry by centrifugally separating the produced water supplied through the supply channel 100.

At this time, the liquid channel 210 is installed in the upper part of the centrifuge 200.

The liquid channel 210 is a channel through which the fluid centrifuged in the centrifuge 200 is discharged to a separate place.

That is, during the process of centrifugal separation of the produced water supplied to the centrifugal separator 200, the fluid is separated into the fluid and the sand by the centrifugal force. In this process, the separated fluid is discharged.

At this time, the fluid is separated into oily water containing oil adhered to the sand and gas which is evaporated while the internal pressure of the centrifuge 200 is released.

At this time, the gas contains hydrocarbons and the like, which may cause toxicity and explosion risk, and therefore must be discharged through the liquid passage 210.

A water level sensor 220 is installed at one side of the centrifuge 200.

The water level sensor 220 is for controlling the water level of the produced water supplied through the supply channel 100.

That is, when a certain amount of produced water is charged into the centrifuge 200 through the supply passage 100, the valve 110 of the supply passage 100 is shut off to stop the supply of the produced water .

Meanwhile, it is preferable that the centrifugal separator 200 is provided in a plurality of, but two centrifugal separators 200A and 200B are arranged in parallel.

As the operation for separating the sand is performed alternately, the overload of each device is solved, so that the device can be prevented from being overloaded and the safety accident of the worker can be prevented.

That is, the periphery of the centrifugal separator 200 may be exposed to harmful substances due to toxic substances such as hydrocarbons generated during centrifugal separation of the produced water in the centrifugal separator 200, 200) to operate continuously.

On the other hand, the supply passage 100 is branched and connected to each of the centrifuges 200, and the supply of the produced water is controlled by the valve 110.

Next, the accumulator 300 receives the sand and slurry separated from the centrifugal separator 200, cleans and discharges it to the tray 400.

The accumulator 300 is disposed below the centrifugal separator 200, and only one accumulator 300 is installed.

That is, since the centrifugal separator 200 and the accumulator 300 are installed not only in the vertical type but also in only one, the efficiency of installation space can be increased.

In particular, control over the crude oil separation operation can be made simple.

At this time, a certain amount of water is stored in the accumulator 300, and the falling rate of the sand dropped from the centrifugal separator 200 is reduced due to the stored water, and at the same time, the sand is washed.

An inflow channel 310 and a discharge channel 320 are installed at one side of the accumulator 300 for water storage and drainage.

Next, the tray 400 collects the sand contained in the accumulator 300 and processes the collected sand into a separate place, and is installed below the accumulator 300.

At this time, the tray 400 may be configured to form a certain space for collecting sand.

The vertical channel 500 serves as a duct for discharging the sand separated by the centrifugal separator 200 to the lower tray 400 and is connected to the first vertical And a second vertical flow passage 520 installed between the accumulator 300 and the tray 400. [

The first vertical channel 510 is disposed below each of the centrifuges 200 and is a channel for discharging the sand separated from the centrifugal separator 200 to the accumulator 300. The second vertical channel 520 is connected to the accumulator 300 To the tray 400. The sand or slurry is discharged to the tray 400. [

That is, the arrangement structure of the centrifugal separator 200 and the accumulator 300 is provided as a vertical type, and the separated sand is dropped by its own weight. The vertical channel 500 is a channel for guiding sand falling by its own weight will be.

At this time, an automatic valve 511 is installed in each of the first vertical flow paths 510, and the automatic valve 511 controls only the first vertical flow path 510 of the operated centrifugal separator 200 to be opened.

Next, the collecting passage 600 connects the first vertical passage 510 and the accumulator 300 of each centrifugal separator 200 and collects the branched first vertical passage 510 to form one passage .

That is, the collecting channel 600 is a channel through which the separated sand is introduced into the accumulator 300 during the operation of the centrifugal separator 200 in an alternating manner, and the collecting channel 600 is connected to the open first vertical channel 510 And is a pipe through which the discharged sand flows into the accumulator 300.

Hereinafter, the operation of the dig sander system constructed as described above will be described.

The supply passage 100A is opened and the produced water is supplied to the one centrifuge 200A from the oil reservoir through the supply passage 100A.

At this time, the branched supply passage 100B leading to the other centrifuge 200B is closed.

The water level sensor 220 senses the level of the produced water coming into the centrifuge 200A and closes the supply channel 100A when a certain amount of produced water is supplied.

Thereafter, the produced water introduced into the centrifugal separator 200A is converted into a tangential velocity.

Thereafter, the produced water moves to the downstream side of the centrifugal separator 200A, which gradually becomes narrower toward the lower part, and the speed and the centrifugal force in the tangential direction are increased.

At this time, the interior of the centrifugal separator 200A is in a high pressure state, and sand, slurry, etc. having a large specific gravity are subjected to a larger centrifugal force to move to the inner peripheral surface side of the centrifugal separator 200A. 200A.

The sand and the slurry pushed to the inner circumferential surface of the centrifugal separator 200A are discharged through the first vertical flow passage 510A and fall into the accumulator 300 under the centrifugal separator 200 through the collection flow passage 600. [

At this time, the oily water is drained through the liquid passage 210.

At this time, in the process of draining the oily water, the pressure inside the centrifugal separator 200A is back pressure. In this process, the oil is vaporized and harmful gas such as hydrocarbons is generated.

The noxious gas is also discharged through the liquid passage 210 and is degassed at a separate place.

On the other hand, the sand and the slurry fall on the accumulator 300 while maintaining the speed of centrifugal force by the inertia. The sand and the slurry fall down by the water filled in the accumulator 300, As shown in FIG.

Thereafter, the discharge passage 320 of the accumulator 300 is opened to drain the fluid, and the second vertical passage 520 is opened to drop the sand and slurry into the tray 400.

The sand and slurry are then conveyed to a shore collected in tray 400 and then sent to a separate processing facility for processing.

Meanwhile, after the above-described series of separating operations are performed, in order to continuously perform the separating operation, the system is changed over to one side.

This is to prevent the overload of the system and to eliminate the harmful gas around the centrifuge 200 as described above so as to secure the safety of the operator.

That is, the continuity of the separation operation can be maintained by operating one side system while one system is stopped until the harmful gas is dissolved.

For this purpose, the branched supply passage 100B, which has been closed, is opened to introduce the produced water into the other centrifugal separator 200B.

At this time, the supply passage 100A communicating with any of the centrifuges 200A stopped is closed.

Thereafter, the sand separated through the series of operations described above flows into the accumulator 300 through the collection flow path 600 through the first vertical flow path 510B.

At this time, the automatic valve 511 provided on the first vertical flow path 510B is automatically opened to control the discharge of the sand to the accumulator 300. [

Thereafter, the sand processed in the accumulator 300 is discharged to the tray 400 through the second vertical channel 520, and then sent to the shore, and then processed.

As described above, the produced water desalter system according to the present invention can prevent the equipment failure due to sand or the like by separating and removing the sand and slurry contained in the drilled crude oil, thereby improving the quality of the refined oil There are technical features that can be.

In addition, it is provided as a vertical type, and as only one accumulator is installed, the efficiency of installation space can be increased and the control work can be simplified.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

100: Supply flow path 200 (200A, 200B): Centrifuge
210: Liquid passage 300: Accumulator
400: Tray 500: Vertical channel
510 (510A, 510B): first vertical channel 520: second vertical channel
600: Collecting Euro

Claims (5)

1. An oil reservoir for separating and storing gas, oil, and produced water using a specific gravity of crude oil drilled from the sea floor,
A supply passage through which the produced water is supplied from the oil reservoir;
A plurality of centrifuges connected to the supply passage for centrifugally separating the produced water;
An accumulator installed below the centrifugal separator and storing sand separated from the centrifugal separator;
A tray installed below the accumulator for collecting sand of the accumulator;
A plurality of first vertical channels provided in the respective centrifuges and forming a channel through which the sand is dropped by the accumulator;
One collecting flow path provided between the plurality of first vertical flow paths and the accumulator;
An automatic valve installed in each of the first vertical flow paths;
And a second vertical flow path provided between the accumulator and the tray, the second vertical flow path forming a channel through which sand is dropped by its own weight. The method according to claim 1,
Wherein a centrifugal oily water and a liquid flow path through which gas is discharged are installed on the upper portion of the centrifugal separator. 3. The method according to claim 1 or 2,
Wherein a liquid for decelerating the flow rate of the sand discharged from the centrifugal separator is stored in the accumulator. 3. The method according to claim 1 or 2,
Wherein the centrifuges are arranged in parallel. 3. The method according to claim 1 or 2,
Wherein the centrifugal separator is provided with a water level sensor for sensing the water level of the produced water flowing through the supply channel.

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