Emergency disposal system and method for wellhead platform and submarine pipeline

Abstract

The invention relates to an emergency disposal system and method for a wellhead platform and a submarine pipeline, and belongs to the technical field of offshore oil exploitation. The system comprises a diesel oil tank and an oil pump, diesel oil is stored in the diesel oil tank, and an outlet of the diesel oil tank is communicated with an inlet of the oil pump; an outlet of the oil pump is respectively communicated with a Christmas tree of the production well and the wellhead platform pipeline; wherein a Christmas tree main valve is arranged on the Christmas tree, a first automatic valve is arranged at an inlet of the oil pump, the first automatic valve and the Christmas tree main valve are automatic valves capable of being remotely controlled, when an emergency situation occurs, the first automatic valve and the Christmas tree main valve are kept in an open state, and diesel oil stored in the diesel oil tank enters the production well through the oil pump; and performing well killing operation on the wellhead of the production well. The method is suitable for the unmanned wellhead platform in the Bohai sea area to carry out emergency treatment on the unmanned wellhead platform after power supply loss or production halt, manual operation is reduced to the maximum extent, the operation reliability of the unmanned wellhead platform is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore oil exploitation, and in particular relates to an emergency disposal system and method for a wellhead platform and a submarine pipeline. Background Art

[0002] The temperature in the Bohai Sea area is relatively low in winter, and the freezing point of crude oil in some oil fields is relatively high. Most of the oil fields in the Bohai Sea are developed by water injection, and there are water injection pipelines between the unmanned wellhead platform and the supporting platform. Since the unmanned wellhead platform is not equipped with an emergency generator, when the unmanned wellhead platform loses power in an emergency, first of all, it is necessary to perform well pressure operations on the wellhead of the production well to ensure safety. Secondly, after the fluid in the mixed submarine pipeline stops flowing, in order to eliminate the risk of freezing and blocking of the condensate pipe in a low-temperature environment, it is necessary to clean the mixed submarine pipeline under emergency conditions. Finally, since the ambient temperature on the seabed is usually above 0 degrees Celsius, water injection or seawater is required to replace the water-containing crude oil in the mixed submarine pipeline.

[0003] As one of the main types of new platforms to be built in the Bohai Sea area in the future, unmanned wellhead platforms should be unmanned, automated, and intelligent. Currently, there is a lack of emergency response systems and methods for wellhead platforms and submarine pipelines to handle emergencies for unmanned wellhead platforms after power outages or shutdowns. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide an emergency disposal system and method for a wellhead platform and a submarine pipeline, so as to solve the problem that there is currently a lack of an emergency disposal system and method for a wellhead platform and a submarine pipeline, and to perform emergency disposal on an unmanned wellhead platform after power loss or shutdown.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention discloses an emergency disposal system for a wellhead platform and a submarine pipeline, comprising an existing production and transportation submarine device and a first peripheral platform, wherein the existing production and transportation submarine device comprises a wellhead platform and a mixed transportation submarine pipeline, wherein the wellhead platform comprises a production well and a wellhead platform pipeline, wherein the production well is equipped with a Christmas tree, wherein the Christmas tree of the production well is connected to the wellhead platform pipeline, wherein the wellhead platform pipeline is connected to the mixed transportation submarine pipeline to form an existing pipeline, wherein the production well is connected to the first production platform via the existing pipeline, wherein the emergency disposal system for the wellhead platform and the submarine pipeline further comprises a diesel tank and an oil pump,

[0007] The diesel tank stores diesel, the outlet of the diesel tank is connected to the inlet of the oil pump, and the outlet of the oil pump is respectively connected to the Christmas tree of the production well and the pipeline of the wellhead platform;

[0008] Wherein, a main valve of the Christmas tree is arranged on the Christmas tree, and a first automatic valve is arranged at the inlet of the oil pump.

[0009] The first automatic valve and the Christmas tree main valve are remotely controllable automatic valves. When an emergency situation occurs, the first automatic valve and the Christmas tree main valve are kept open, and the diesel stored in the diesel tank enters the production well through the oil pump to perform a well killing operation on the wellhead of the production well.

[0010] Furthermore, the existing production and transportation submarine device also includes a multi-way valve, and the multi-way valve is arranged on the wellhead platform pipeline; the inlet of the multi-way valve is provided with a multi-way valve inlet valve.

[0011] Furthermore, the existing production and transportation submarine device also includes a multiphase flowmeter, one of the outlets of the multi-way valve is connected in parallel with the wellhead platform pipeline to form a multiphase flowmeter branch, and the multiphase flowmeter is arranged on the multiphase flowmeter branch.

[0012] Furthermore, a left wing valve and a right wing valve are respectively provided on the wellhead platform pipelines on both sides of the Christmas tree.

[0013] Furthermore, it also includes a ball-launching barrel branch line, which is connected in parallel with the wellhead platform pipeline after the multiphase flowmeter branch line. A ball-launching barrel is arranged on the ball-launching barrel branch line, and a ball-launching barrel inlet valve and a ball-launching barrel outlet valve are respectively arranged on the ball-launching barrel branch line at the inlet and outlet of the ball-launching barrel; a second automatic valve is arranged on the wellhead platform pipeline in parallel with the ball-launching barrel branch line.

[0014] Furthermore, a ball passing indicator is provided on the wellhead platform pipeline after the ball launching barrel branch line.

[0015] Furthermore, a sea pipe inlet valve is provided at the junction of the wellhead platform pipeline and the mixed transportation seabed pipeline.

[0016] Furthermore, it also includes a replacement pipeline and a water injection pipeline, wherein the replacement pipeline is arranged on the wellhead platform pipeline, and one end of the replacement pipeline is connected to the wellhead platform pipeline after the multiphase flow meter branch and before the ball barrel branch, and the other end is connected to the second peripheral platform through the water injection pipeline; wherein the second peripheral platform and the first peripheral platform are the same platform or two different platforms; the replacement pipeline is provided with a third automatic valve, and the third automatic valve is an automatic valve that can be remotely controlled.

[0017] In a second aspect, the present invention also discloses an emergency disposal method for a wellhead platform and a submarine pipeline, using the above-mentioned emergency disposal system for the wellhead platform and the submarine pipeline, comprising:

[0018] Perform well-killing operation on production wells: When the wellhead platform stops production due to power outage, the diesel in the diesel tank is pumped into the Christmas tree in the production well to perform well-killing operation on the production well until the water-containing crude oil in the Christmas tree is pressed below the designed water level;

[0019] The pigging operation in the mixed transport submarine pipeline includes the following steps:

[0020] Connecting the water injection pipeline, the replacement pipeline, the ball launch tube branch line and the mixed transport submarine pipeline;

[0021] Place the pipe cleaning ball in the ball tube;

[0022] Open the third automatic valve, pump fluid into the water injection pipeline through the pump on the second peripheral platform, and the fluid passes through the displacement pipeline into the ball launching barrel, and push the cleaning ball in the ball launching barrel into the mixed transport submarine pipeline;

[0023] The cleaning ball moves in the mixed transportation submarine pipeline toward the first peripheral platform, and simultaneously dredges the mixed transportation submarine pipeline;

[0024] The water injection replacement operation for the water-containing crude oil in the mixed submarine pipeline includes the following steps:

[0025] Connecting the water injection pipeline, the replacement pipeline, the wellhead platform pipeline and the mixed transport submarine pipeline;

[0026] The third automatic valve is kept in an open state, and fluid is pumped into the water injection pipeline by a pump on the second peripheral platform. The fluid passes through the replacement pipeline and enters the wellhead platform pipeline. Finally, the mixed transportation submarine pipeline is carried out and the water-containing crude oil in the original mixed transportation submarine pipeline is replaced until the water-containing crude oil in the mixed transportation submarine pipeline is pushed out.

[0027] Specifically, the specific measures for pumping the diesel in the diesel tank to the Christmas tree in the production well are: closing the oil pump, the first automatic valve, the left wing valve, the Christmas tree main valve, the right wing valve and the second automatic valve, and opening the inlet valve of the ball cylinder, the outlet valve of the ball cylinder and the inlet valve of the sea pipe;

[0028] The specific measures to connect the water injection pipeline, the replacement pipeline, the ball launcher branch line and the mixed transport submarine pipeline are: closing the oil pump, the first automatic valve, the left wing valve, the Christmas tree main valve, the right wing valve and the second automatic valve, and opening the ball launcher inlet valve, the ball launcher outlet valve and the sea pipe inlet valve;

[0029] The specific measures to make the water injection pipeline, the replacement pipeline, the wellhead platform pipeline and the mixed transportation submarine pipeline conduct are: opening the second automatic valve, closing the inlet valve and the outlet valve of the ball launcher.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (I) The present invention discloses an emergency disposal system for a wellhead platform and a submarine pipeline. A diesel tank and an oil pump are added to the production well and the wellhead platform pipeline of an existing production and transportation submarine device. Diesel is stored in the diesel tank. The outlet of the diesel tank is connected to the inlet of the oil pump. The outlet of the oil pump is respectively connected to the Christmas tree of the production well and the wellhead platform pipeline. A Christmas tree main valve is provided on the Christmas tree. The inlet of the oil pump is provided with a first automatic valve. The first automatic valve and the Christmas tree main valve are automatic valves that can be remotely controlled. When an emergency situation occurs, the first automatic valve and the Christmas tree main valve are kept in an open state. The diesel stored in the diesel tank enters the production well through the oil pump, and a well pressure operation is performed on the wellhead of the production well.

[0032] (ii) In order to clean the mixed submarine pipeline, the emergency disposal system of the wellhead platform and the submarine pipeline disclosed in the present invention also includes a ball barrel branch line, the ball barrel branch line is connected in parallel with the wellhead platform pipeline after the multiphase flow meter branch, a ball barrel is arranged on the ball barrel branch line, and a ball barrel inlet valve and a ball barrel outlet valve are respectively arranged on the ball barrel branch line at the inlet and outlet of the ball barrel; a second automatic valve is arranged on the wellhead platform pipeline connected in parallel with the ball barrel branch line. The method of unblocking the mixed submarine pipeline by the following method is: connect the water injection pipeline, the displacement pipeline with the ball barrel branch line and the mixed submarine pipeline, and place the cleaning ball in the ball barrel; open the third automatic valve, pump fluid into the water injection pipeline through the pump on the second peripheral platform, the fluid passes through the displacement pipeline and enters the ball barrel, and pushes the cleaning ball in the ball barrel into the mixed submarine pipeline; the cleaning ball moves in the mixed submarine pipeline toward the first peripheral platform, and unblocks the mixed submarine pipeline at the same time.

[0033] (III) In order to perform water injection and replacement operation on the water-containing crude oil in the mixed submarine pipeline, the emergency disposal system of the wellhead platform and the submarine pipeline disclosed in the present invention also includes a replacement pipeline and a water injection pipeline. The replacement pipeline is arranged on the wellhead platform pipeline, and one end of the replacement pipeline is connected to the wellhead platform pipeline after the multiphase flow meter branch and before the ball barrel branch, and the other end is connected to the second peripheral platform through the water injection pipeline; the replacement pipeline is provided with a third automatic valve, and the third automatic valve is an automatic valve that can be remotely controlled. The following method is used to perform water injection and replacement operation on the water-containing crude oil in the mixed submarine pipeline: the water injection pipeline, the replacement pipeline, the wellhead platform pipeline and the mixed submarine pipeline are connected; the third automatic valve is kept in an open state, and fluid is pumped into the water injection pipeline by a pump on the second peripheral platform, and the fluid passes through the replacement pipeline and enters the wellhead platform pipeline, and finally the mixed submarine pipeline is operated and the water-containing crude oil in the original mixed submarine pipeline is replaced until the water-containing crude oil in the mixed submarine pipeline is pushed out.

[0034] In summary, the emergency disposal system and method of the wellhead platform and submarine pipeline disclosed in the present invention is aimed at most of the oil fields in Bohai Sea that adopt water injection development, and fully utilizes the water injection pipelines between the unmanned wellhead platform and the surrounding platforms. When the unmanned wellhead platform or the surrounding platforms that rely on it lose power and shut down production in an emergency, the water-containing crude oil at the platform wellhead is killed by diesel with a low freezing point through remote operation without the need for personnel to board the platform. At the same time, the water-containing crude oil in the mixed submarine pipeline is replaced with water injection or seawater through remote switching of the valve to prevent freezing and blockage of the submarine pipeline caused by low temperature. Remote well killing of the unmanned platform wellhead and emergency replacement of the submarine pipeline are realized to ensure the safety of the platform and the pipeline does not have a condensation pipe accident, which is convenient for the subsequent platform production restart, minimizes manual operation, and improves efficiency. The emergency disposal system and method of the wellhead platform and submarine pipeline disclosed in the present invention are suitable for unmanned wellhead platforms in the Bohai region to carry out emergency treatment of unmanned wellhead platforms after losing power or stopping production, minimize manual operation, improve the operating reliability of unmanned wellhead platforms, and reduce maintenance costs. This technology is safe and reliable, does not require personnel to be on-site for operation, improves the efficiency of handling after emergency power outages and production shutdowns, and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an existing pipeline of a wellhead platform provided in Example 1 of the present invention;

[0036] Figure 2 It is a structural schematic diagram of an emergency disposal system for a wellhead platform and a submarine pipeline suitable for well killing operations provided in Example 1 of the present invention;

[0037] Figure 3 It is a structural schematic diagram of an emergency disposal system for a wellhead platform and a submarine pipeline suitable for performing a pigging operation on a mixed transportation submarine pipeline provided in Example 2 of the present invention;

[0038] Figure 4 It is a structural schematic diagram of an emergency disposal system of a wellhead platform and a submarine pipeline suitable for water injection and displacement operations on water-containing crude oil in a mixed submarine pipeline, provided in Example 3 of the present invention.

[0039] Description of reference numerals: A-first peripheral platform, B-second peripheral platform;

[0040] 1-production and transportation submarine device, 10-production well, 11-wellhead platform pipeline, 12-mixed transportation submarine pipeline, 13-multi-way valve, 14-multiphase flow meter;

[0041] 2-diesel tank, 20-oil pump;

[0042] 3- service barrel, 30- ball passing indicator;

[0043] 4-replacement pipeline, 40-water injection pipeline;

[0044] V1- Christmas tree main valve,

[0045] V2- first automatic valve,

[0046] V3-left wing valve,

[0047] V4 - right wing valve,

[0048] V5-Multi-way valve inlet valve,

[0049] V6-ball cylinder inlet valve,

[0050] V7-Second automatic valve,

[0051] V8-ball cylinder outlet valve,

[0052] V9-Subsea Pipeline Inlet Valve,

[0053] V10 - Third automatic valve. DETAILED DESCRIPTION

[0054] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0055] In order to solve the problem of the current lack of an emergency disposal system and method for wellhead platforms and submarine pipelines, and to perform emergency treatment on unmanned wellhead platforms after power outage or shutdown, the present invention is conceived as follows:

[0056] First, an emergency disposal system for a wellhead platform and a submarine pipeline suitable for a well killing operation is provided, comprising a diesel tank 2 and an oil pump 20, wherein diesel is stored in the diesel tank 2, and the outlet of the diesel tank 2 is connected to the inlet of the oil pump 20, and the outlet of the oil pump 20 is respectively connected to the Christmas tree of the production well 10 and the wellhead platform pipeline 11; wherein a Christmas tree main valve V1 is provided on the Christmas tree, and a first automatic valve V2 is configured at the inlet of the oil pump 20, wherein the first automatic valve V2 and the Christmas tree main valve V1 are automatic valves that can be remotely controlled, and when an emergency situation occurs, the first automatic valve V2 and the Christmas tree main valve V1 are kept in an open state, and the diesel stored in the diesel tank 2 enters the production well 10 through the oil pump 20, and a well killing operation is performed on the wellhead of the production well 10.

[0057] Secondly, an emergency disposal system for a wellhead platform and a submarine pipeline suitable for cleaning mixed submarine pipelines is provided, which also includes a ball barrel branch line. The ball barrel branch line is connected in parallel with the wellhead platform pipeline 11 after the multiphase flow meter branch. A ball barrel 3 is arranged on the ball barrel branch line. A ball barrel inlet valve V6 and a ball barrel outlet valve V8 are respectively arranged on the ball barrel branch line at the inlet and outlet of the ball barrel 3; a second automatic valve V7 is arranged on the wellhead platform pipeline 11 in parallel with the ball barrel branch line. The method for unblocking the mixed transport submarine pipeline 12 is as follows: connect the water injection pipeline 40, the replacement pipeline 4, the ball-launching barrel branch line and the mixed transport submarine pipeline 12, and place the pipe cleaning ball in the ball-launching barrel 3; open the third automatic valve V10, and pump fluid into the water injection pipeline 40 through the pump on the second peripheral platform B, and the fluid passes through the replacement pipeline 4 and enters the ball-launching barrel 3, and pushes the pipe cleaning ball in the ball-launching barrel 3 into the mixed transport submarine pipeline 12; the pipe cleaning ball moves in the mixed transport submarine pipeline 12 toward the first peripheral platform A, and at the same time dredges the mixed transport submarine pipeline 12.

[0058] Finally, an emergency disposal system for a wellhead platform and a submarine pipeline suitable for water injection and displacement operations on water-containing crude oil in a mixed submarine pipeline is provided, which also includes a displacement pipeline 4 and a water injection pipeline 40. The displacement pipeline 4 is arranged on the wellhead platform pipeline 11, and one end thereof is connected to the wellhead platform pipeline 11 after the multiphase flow meter branch and before the ball barrel branch, and the other end is connected to the second peripheral platform B through the water injection pipeline 40; the displacement pipeline 4 is provided with a third automatic valve V10, and the third automatic valve V10 is an automatic valve that can be remotely controlled. The following method is used to inject and displace the water-containing crude oil in the mixed submarine pipeline: the water injection pipeline 40, the displacement pipeline 4, the wellhead platform pipeline 11 and the mixed submarine pipeline 12 are connected; the third automatic valve V10 is kept in an open state, and fluid is pumped into the water injection pipeline 40 by a pump on the second peripheral platform B, and the fluid passes through the displacement pipeline 4 and enters the wellhead platform pipeline 11, and finally the mixed submarine pipeline 12 is injected and the water-containing crude oil in the original mixed submarine pipeline 12 is displaced until the water-containing crude oil in the mixed submarine pipeline 12 is pushed out.

[0059] Example 1: An emergency response system suitable for well killing operations

[0060] Embodiment 1 of the present invention provides an emergency response system suitable for well killing operations, and its structure is described in detail below with reference to the accompanying drawings.

[0061] The emergency disposal system includes an existing production and transportation submarine device 1 and a first peripheral platform A.

[0062] refer to Figure 1The existing production and transportation submarine device 1 includes a wellhead platform and a mixed transportation submarine pipeline 12. The wellhead platform includes a production well 10 and a wellhead platform pipeline 11. The production well 10 is equipped with an oil production tree. The oil production tree of the production well 10 is connected to the wellhead platform pipeline 11. The wellhead platform pipeline 11 is connected to the mixed transportation submarine pipeline 12 to form an existing pipeline. The production well 10 is connected to the first production platform A through the existing pipeline.

[0063] In order to realize multi-way transportation, the existing production and transportation submarine device 1 further includes a multi-way valve 13, and the multi-way valve 13 is arranged on the wellhead platform pipeline 11; a multi-way valve inlet valve V5 is arranged at the inlet of the multi-way valve 13.

[0064] In order to detect the flow in the wellhead platform pipeline 11, the existing production and transportation seabed device 1 also includes a multiphase flowmeter 14, one of the outlets of the multi-way valve 13 is connected in parallel with the wellhead platform pipeline 11 to form a multiphase flowmeter branch, and the multiphase flowmeter 14 is arranged on the multiphase flowmeter branch.

[0065] In order to be applicable to the well killing operation, the emergency disposal system of the wellhead platform and the submarine pipeline applicable to the well killing operation includes a diesel tank 2 and an oil pump 20 .

[0066] refer to Figure 2 The diesel tank 2 stores diesel, the outlet of the diesel tank 2 is connected to the inlet of the oil pump 20, and the outlet of the oil pump 20 is respectively connected to the Christmas tree of the production well 10 and the wellhead platform pipeline 11;

[0067] The Christmas tree is provided with a Christmas tree main valve V1, and the inlet of the oil pump 20 is provided with a first automatic valve V2.

[0068] The first automatic valve V2 and the Christmas tree main valve V1 are remotely controllable automatic valves. When an emergency situation occurs, the first automatic valve V2 and the Christmas tree main valve V1 are kept open, and the diesel stored in the diesel tank 2 enters the production well 10 through the oil pump 20 to perform a well killing operation on the wellhead of the production well 10.

[0069] For the convenience of control, a left wing valve V3 and a right wing valve V4 are respectively provided on the wellhead platform pipeline 11 on both sides of the Christmas tree.

[0070] Specifically, the left wing valve V3 and the right wing valve V4 are automatic valves that can be remotely controlled.

[0071] Example 2: An emergency disposal system suitable for cleaning mixed transport submarine pipelines

[0072] Embodiment 2 of the present invention provides an emergency disposal system suitable for performing pigging operations on mixed transport submarine pipelines, which is improved on the basis of the emergency disposal system of embodiment 1, and the improvements are as follows:

[0073] refer to Figure 3 The emergency disposal system also includes a ball-launching barrel branch line, which is connected in parallel with the wellhead platform pipeline 11 after the multiphase flowmeter branch line. A ball-launching barrel 3 is arranged on the ball-launching barrel branch line, and a ball-launching barrel inlet valve V6 and a ball-launching barrel outlet valve V8 are respectively arranged on the ball-launching barrel branch line at the inlet and outlet of the ball-launching barrel 3; a second automatic valve V7 is arranged on the wellhead platform pipeline 11 connected in parallel with the ball-launching barrel branch line.

[0074] Specifically, the serving tube inlet valve V6 and the serving tube outlet valve V8 are automatic valves that can be remotely controlled.

[0075] In order to detect the effect of the ball launching barrel 3 in launching the cleaning ball, a ball passing indicator 30 is provided on the wellhead platform pipeline 11 after the ball launching barrel branch line.

[0076] For the convenience of control, a sea pipe inlet valve V9 is provided at the junction of the wellhead platform pipeline 11 and the mixed transportation seabed pipeline 12 .

[0077] Example 3: An emergency disposal system suitable for water injection and replacement of water-containing crude oil in mixed submarine pipelines

[0078] Embodiment 3 of the present invention provides an emergency disposal system suitable for water injection replacement operation of water-containing crude oil in mixed submarine pipelines, which is improved on the basis of the emergency disposal system of embodiment 2, and the improvements are as follows:

[0079] refer to Figure 4 The emergency disposal system also includes a replacement pipeline 4 and a water injection pipeline 40.

[0080] The displacement pipeline 4 is arranged on the wellhead platform pipeline 11, and one end thereof is connected to the wellhead platform pipeline 11 after the multiphase flow meter branch and before the ball barrel branch, and the other end thereof is connected to the second peripheral platform B through the water injection pipeline 40;

[0081] The replacement pipeline 4 is provided with a third automatic valve V10, and the third automatic valve V10 is an automatic valve that can be remotely controlled.

[0082] It should be noted that the second peripheral platform B and the first peripheral platform A are the same platform or two different platforms.

[0083] Example 4: An emergency disposal method for a wellhead platform and a submarine pipeline

[0084] Embodiment 4 of the present invention provides an emergency disposal method for a wellhead platform and a submarine pipeline, using the emergency disposal system of embodiment 3, and the method comprises the following steps:

[0085] Perform well-killing operation on production wells: When the wellhead platform stops production due to power loss, the diesel in the diesel tank 2 is pumped into the Christmas tree in the production well 10, and the production well 10 is killed until the water-containing crude oil in the Christmas tree is pressed below the designed water level. The specific measures are: close the right wing valve V4, open the first automatic valve V2, the left wing valve V3 and the Christmas tree main valve V1, and start the oil pump 20.

[0086] Specifically, the design below the water surface is below 10 meters above the water surface.

[0087] The pigging operation in the mixed transport submarine pipeline includes the following steps:

[0088] Make the water injection pipeline 40, the replacement pipeline 4, the ball launcher branch line and the mixed transport submarine pipeline 12 connected, and the specific measures are: close the oil pump 20, the first automatic valve V2, the left wing valve V3, the Christmas tree main valve V1, the right wing valve V4 and the second automatic valve V7, open the ball launcher inlet valve V6, the ball launcher outlet valve V8 and the sea pipe inlet valve V9;

[0089] Place the pipe cleaning ball in the ball-serving tube 3;

[0090] Open the third automatic valve V10, pump fluid into the water injection pipeline 40 on the second peripheral platform B through the pump, and the fluid passes through the displacement pipeline 4 into the ball-launching cylinder 3, pushing the cleaning ball in the ball-launching cylinder 3 into the mixed transport submarine pipeline 12;

[0091] The cleaning ball moves in the mixed transportation submarine pipeline 12 toward the first peripheral platform A, and simultaneously clears the mixed transportation submarine pipeline 12 .

[0092] The water injection replacement operation for the water-containing crude oil in the mixed submarine pipeline includes the following steps:

[0093] The water injection pipeline 40, the replacement pipeline 4, the wellhead platform pipeline 11 and the mixed transportation submarine pipeline 12 are connected by opening the second automatic valve V7, and closing the ball-launching cylinder inlet valve V6 and the ball-launching cylinder outlet valve V8.

[0094] Keep the third automatic valve V10 in an open state, and pump fluid into the water injection pipeline 40 on the second peripheral platform B through a pump, and the fluid passes through the replacement pipeline 4 and enters the wellhead platform pipeline 11, and finally the mixed transportation submarine pipeline 12 is carried out to replace the water-containing crude oil in the original mixed transportation submarine pipeline 12, until the water-containing crude oil in the mixed transportation submarine pipeline 12 is pushed out.

[0095] In the pigging operation of the mixed transport submarine pipeline, the second automatic valve V7 is opened and the inlet valve V6 and the outlet valve V8 of the ball launcher are closed after the ball indicator 30 confirms that the pigging ball has been successfully launched.

[0096] In the water injection replacement operation of the water-containing crude oil in the mixed submarine pipeline, the replacement fluid used is usually qualified injection water. When the second peripheral platform B is also shut down in an emergency, seawater injected with preservatives can be used as the replacement fluid.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An emergency disposal system for a wellhead platform and a submarine pipeline, comprising an existing production and transportation submarine device (1) and a first peripheral platform (A), wherein the existing production and transportation submarine device (1) comprises a wellhead platform and a mixed transportation submarine pipeline (12), wherein the wellhead platform comprises a production well (10) and a wellhead platform pipeline (11), wherein the production well (10) is provided with a Christmas tree, wherein the Christmas tree of the production well (10) is connected to the wellhead platform pipeline (11), wherein the wellhead platform pipeline (11) is connected to the mixed transportation submarine pipeline (12) to form an existing pipeline, wherein the production well (10) is connected to the first production platform (A) via the existing pipeline, wherein: It also includes a diesel tank (2) and an oil pump (20), The diesel tank (2) stores diesel fuel, the outlet of the diesel tank (2) is connected to the inlet of the oil pump (20), and the outlet of the oil pump (20) is respectively connected to the Christmas tree of the production well (10) and the wellhead platform pipeline (11); Wherein, a main valve (V1) of the Christmas tree is arranged on the Christmas tree, and a first automatic valve (V2) is arranged at the inlet of the oil pump (20). The first automatic valve (V2) and the Christmas tree main valve (V1) are remotely controllable automatic valves. When an emergency situation occurs, the first automatic valve (V2) and the Christmas tree main valve (V1) are kept in an open state, and the diesel stored in the diesel tank (2) enters the production well (10) through the oil pump (20), and a well-killing operation is performed on the wellhead of the production well (10).

2. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 1 is characterized in that: The existing production and transportation subsea device (1) further comprises a multi-way valve (13), The multi-way valve (13) is arranged on the wellhead platform pipeline (11); A multi-way valve inlet valve (V5) is arranged at the inlet of the multi-way valve (13).

3. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 2 is characterized in that: The existing production and transportation subsea device (1) further comprises a multiphase flow meter (14), One of the outlets of the multi-way valve (13) is connected in parallel with the wellhead platform pipeline (11) to form a multiphase flow meter branch, and the multiphase flow meter (14) is arranged on the multiphase flow meter branch.

4. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 3 is characterized in that: A left wing valve (V3) and a right wing valve (V4) are respectively arranged on the wellhead platform pipeline (11) on both sides of the Christmas tree.

5. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 3 or 4, characterized in that: It also includes a ball launcher branch line, which is connected in parallel with the wellhead platform pipeline (11) after the multiphase flow meter branch line. The ball-serving barrel branch line is provided with a ball-serving barrel (3). A ball serving tube inlet valve (V6) and a ball serving tube outlet valve (V8) are respectively arranged on the ball serving tube branch lines at the inlet and outlet of the ball serving tube (3); A second automatic valve (V7) is provided on the wellhead platform pipeline (11) connected in parallel with the ball launching barrel branch line.

6. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 5, characterized in that: A ball passing indicator (30) is provided on the wellhead platform pipeline (11) after the ball launching barrel branch line.

7. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 6 is characterized in that: A sea pipe inlet valve (V9) is provided at the junction of the wellhead platform pipeline (11) and the mixed transportation seabed pipeline (12).

8. The emergency disposal system for the wellhead platform and the submarine pipeline according to claim 7, characterized in that: It also includes a replacement pipeline (4) and a water injection pipeline (40), The replacement pipeline (4) is arranged on the wellhead platform pipeline (11), and one end of the replacement pipeline (4) is connected to the wellhead platform pipeline (11) after the multiphase flow meter branch and before the ball barrel branch, and the other end is connected to the second peripheral platform (B) through the water injection pipeline (40); Wherein, the second peripheral platform (B) and the first peripheral platform (A) are the same platform or two different platforms; The replacement pipeline (4) is provided with a third automatic valve (V10), and the third automatic valve (V10) is an automatic valve that can be remotely controlled.

9. An emergency disposal method for a wellhead platform and a submarine pipeline, using the emergency disposal system for a wellhead platform and a submarine pipeline according to claim 8, characterized in that: include Performing a well-killing operation on the production well: when the wellhead platform stops production in an emergency due to power failure, the diesel in the diesel tank (2) is pumped into the Christmas tree in the production well (10), and the production well (10) is killed until the water-containing crude oil in the Christmas tree is pressed below the designed water level; The pigging operation in the mixed transport submarine pipeline includes the following steps: Connecting the water injection pipeline (40), the replacement pipeline (4), the ball launching tube branch line and the mixed transport submarine pipeline (12); Placing the pipe cleaning ball in the ball launching tube (3); Open the third automatic valve (V10), pump fluid into the water injection pipeline (40) through the pump on the second peripheral platform (B), and the fluid passes through the displacement pipeline (4) into the ball launching barrel (3), and the cleaning ball in the ball launching barrel (3) is pushed into the mixed transport submarine pipeline (12); The cleaning ball moves in the mixed transport submarine pipeline (12) toward the first peripheral platform (A), while clearing the mixed transport submarine pipeline (12); The water injection replacement operation for the water-containing crude oil in the mixed submarine pipeline includes the following steps: Connecting the water injection pipeline (40), the replacement pipeline (4), the wellhead platform pipeline (11) and the mixed transport submarine pipeline (12); The third automatic valve (V10) is kept in an open state, and fluid is pumped into the water injection pipeline (40) on the second peripheral platform (B) by a pump, and the fluid passes through the replacement pipeline (4) and enters the wellhead platform pipeline (11), and finally the mixed transportation submarine pipeline (12) is carried out to replace the water-containing crude oil in the original mixed transportation submarine pipeline (12), until the water-containing crude oil in the mixed transportation submarine pipeline (12) is completely pushed out.

10. The emergency disposal method for the wellhead platform and the submarine pipeline according to claim 9, characterized in that: The specific measures for pumping the diesel in the diesel tank (2) to the Christmas tree in the production well (10) are: closing the oil pump (20), the first automatic valve (V2), the left wing valve (V3), the Christmas tree main valve (V1), the right wing valve (V4) and the second automatic valve (V7), and opening the ball tube inlet valve (V6), the ball tube outlet valve (V8) and the sea pipe inlet valve (V9); The specific measures for connecting the water injection pipeline (40), the replacement pipeline (4), the ball launcher branch line and the mixed transport submarine pipeline (12) are as follows: closing the oil pump (20), the first automatic valve (V2), the left wing valve (V3), the Christmas tree main valve (V1), the right wing valve (V4) and the second automatic valve (V7), and opening the ball launcher inlet valve (V6), the ball launcher outlet valve (V8) and the sea pipe inlet valve (V9); The specific measures for connecting the water injection pipeline (40), the replacement pipeline (4), the wellhead platform pipeline (11) and the mixed transport submarine pipeline (12) are: opening the second automatic valve (V7), and closing the ball launcher inlet valve (V6) and the ball launcher outlet valve (V8).

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