CN114542051B - A deepwater oil and gas field underwater production pressure reduction system and pressure reduction method - Google Patents
A deepwater oil and gas field underwater production pressure reduction system and pressure reduction method Download PDFInfo
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- CN114542051B CN114542051B CN202210146904.XA CN202210146904A CN114542051B CN 114542051 B CN114542051 B CN 114542051B CN 202210146904 A CN202210146904 A CN 202210146904A CN 114542051 B CN114542051 B CN 114542051B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
- E21B34/04—Valve arrangements for boreholes or wells in well heads in underwater well heads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
本发明公开了一种深水油气田水下生产降压系统及其降压方法，其中深水油气田水下生产降压系统包括油气生产井、水下高完整性压力保护系统、缓冲管段、海底管段、深水立管段和平台；降压方法包括选定关井压力高的油气生产井作为目标井、计算缓冲管段的长度、安装水下高完整性压力保护系统、设置深水立管的管壁厚度大于回接海管的管壁厚度以及设置压力安全阀等步骤。本发明公开的深水油气田水下生产降压系统及其降压方法，在水下生产状态下能够实现水下生产系统的降压，使得海底管段及其回接海管乃至深水立管段的设计压力显著降低，从而减小深水立管和回接海管的管壁厚度，可大幅减少工程投资。
The present invention discloses a deepwater oil and gas field underwater production pressure reduction system and a pressure reduction method thereof, wherein the deepwater oil and gas field underwater production pressure reduction system comprises an oil and gas production well, an underwater high-integrity pressure protection system, a buffer pipe section, a seabed pipe section, a deepwater riser section and a platform; the pressure reduction method comprises the steps of selecting an oil and gas production well with a high shut-in pressure as a target well, calculating the length of the buffer pipe section, installing the underwater high-integrity pressure protection system, setting the wall thickness of the deepwater riser to be greater than the wall thickness of the return sea pipe, and setting a pressure safety valve. The deepwater oil and gas field underwater production pressure reduction system and a pressure reduction method thereof disclosed by the present invention can realize the pressure reduction of the underwater production system under the underwater production state, so that the design pressure of the seabed pipe section and its return sea pipe and even the deepwater riser section is significantly reduced, thereby reducing the wall thickness of the deepwater riser and the return sea pipe, which can greatly reduce the project investment.
Description
Technical Field
The invention belongs to the technical field of deep water oil and gas field development, and particularly relates to a deep water oil and gas field underwater production depressurization system and a depressurization method thereof.
Background
In the development process of the deep water oil and gas field, the well closing pressure of an underwater wellhead is very high, and the overpressure working condition is caused by two accidents of (1) failure of the oil nozzle of the christmas tree and full opening and (2) emergency shutdown of production or blockage of submarine pipeline hydrate caused by low conveying temperature due to process accidents of the oil and gas production platform. When an overpressure condition occurs, the pressure in the pipeline will build up to the shut-in pressure. Therefore, the design pressure of underwater production facilities such as jumper pipes, manifolds, sea pipes and the like from the underwater production wellhead to the landing platform shutoff valve is usually designed by adopting the maximum shut-in pressure value P1 of all single wells, namely the full pressure design. At present, li Gulf-1 gas fields and first-deep sea gas fields produced in China all adopt full-pressure designs.
By adopting the full-pressure design, although the underwater production facilities and pipelines cannot be overpressured, in the design stage, the deepwater vertical pipe with larger hanging weight, the tie-back sea pipe with larger wall thickness and the manifold with larger weight are required to be designed for the oil-gas field with extremely high shut-in pressure. In the construction stage, the deepwater risers with large weight are required to be hung, the installation difficulty is increased, the ship construction hoisting requirements are improved, the selectivity of installation resources is reduced, the feasibility of a floating platform development scheme is even limited, the tieback sea pipes with large wall thickness are welded, the construction efficiency is reduced, the heavy weight of the manifolds are required to have higher requirements on the installation ship hoisting capability, and the engineering investment cost of deepwater oil-gas field development is obviously increased.
Disclosure of Invention
The invention aims to provide a deepwater oil-gas field underwater production depressurization system and a depressurization method thereof, which are used for solving the problem that the investment cost of the deepwater gas field development engineering is increased due to the adoption of a full-pressure design at present.
The underwater high-integrity pressure protection system comprises a matched pipeline, a trigger, a logic solver and a final execution facility, wherein a well flow inlet and a well flow outlet are respectively arranged at two ends of the matched pipeline, the trigger is arranged at the upstream of the matched pipeline, the final execution facility is arranged at the downstream of the matched pipeline, and the trigger and the final execution facility are respectively connected through a signal line.
The trigger comprises a plurality of pressure sensors, a final execution facility comprises two shutoff valves, the two shutoff valves are arranged in the matched pipeline in series and used for controlling the shutoff in the matched pipeline, the logic solver comprises a set of independent control modules, the control modules are respectively connected with the pressure sensors of the trigger and the shutoff valves of the final execution facility through signal lines, the pressure sensors collect pressure signals of the matched pipeline and transmit the collected pressure signals to the control module of the logic solver, and the logic solver judges and sends decision instructions to the shutoff valves of the final execution facility.
The invention also relates to an underwater production depressurization system of the deepwater oil-gas field, which comprises an oil-gas production well, a submarine pipeline section, a deepwater riser section and a platform, wherein a section of the submarine pipeline section, which is close to the discharge end of the platform, is provided with a tie-back sea pipe, the deepwater riser section is provided with a deepwater riser, the tie-back sea pipe is in butt joint with the lower end of the deepwater riser section, the upper end of the deepwater riser is hung on the platform, the underwater high-integrity pressure protection system and a buffer pipeline section are further included, the discharge port of the oil-gas production well is in butt joint with the well inflow port of a matched pipeline of the underwater high-integrity pressure protection system, and the well outflow port of the matched pipeline of the underwater high-integrity pressure protection system is connected with the feed port of the submarine pipeline section through the buffer pipeline to form the buffer pipeline section.
Further, a landing platform shutoff valve is arranged at the upper end of the deepwater riser suspended on the platform.
Further, a pressure safety valve is arranged at the top of the deepwater vertical pipe at the upstream of the landing platform shutoff valve, and when the pressure in the deepwater vertical pipe exceeds a set critical value, the pressure safety valve opens the release fluid to realize pressure release.
Further, the wall thickness of the deepwater riser is greater than that of the tieback sea pipe.
Further, the system also comprises a christmas tree shutdown system, wherein the christmas tree shutdown system and the underwater high-integrity pressure protection system are two mutually independent overpressure protection systems.
The invention also relates to a depressurization method of the depressurization system for underwater production of the deepwater oil-gas field, which comprises the following steps:
s1, selecting an oil gas production well with high well closing pressure as a target well according to reservoir characteristics of each block of a gas field, oil reservoir production allocation and well position distribution;
S2, calculating the length of a buffer pipe section through dynamic simulation according to the fluid flow and the pressure value flowing in a well inflow port of the underwater high-integrity pressure protection system and the turn-off time of a turn-off valve of a final execution facility;
step S3, a discharge hole of the target well is in butt joint with a well inflow hole of a matched pipeline of the underwater high-integrity pressure protection system, and a well inflow hole of the matched pipeline of the underwater high-integrity pressure protection system is communicated with a feed hole of a submarine pipeline of the submarine pipeline section through a buffer pipeline section, so that the installation of the underwater high-integrity pressure protection system is completed;
s4, setting the pipe wall thickness of the deepwater vertical pipe to be larger than that of the tieback sea pipe;
and S5, setting a landing platform shutoff valve at the upper end of the deepwater riser suspended on the platform, and setting a pressure safety valve at the top of the deepwater riser at the upstream of the landing platform shutoff valve.
Preferably, when the underwater high-integrity pressure protection system works, once an overpressure working condition occurs, the production tree shutdown system is started first, and the underwater high-integrity pressure protection system can be started only when the production tree shutdown system fails to effectively shut off a high-pressure source, so that the safety of downstream production facilities is protected.
Compared with the prior art, the invention has the beneficial effects that:
The invention discloses an underwater production depressurization system and a depressurization method for a deep water oil-gas field, which combine reservoir characteristics of each block of the gas field, oil reservoir production allocation and well position distribution, select a production well with extremely high shut-in pressure as a target well, calculate the length of a buffer pipe section and finish the installation of an underwater high-integrity pressure protection system, actively monitor the production pressure of fluid media in a pipeline by the underwater high-integrity pressure protection system, and effectively cut off and isolate a high-pressure source instantly by a valve of the underwater high-integrity pressure protection system under an overpressure working condition to prevent overpressure of underwater production facilities. The underwater production depressurization system and the depressurization method thereof for the deepwater oil-gas field can realize depressurization of the underwater production system in an underwater production state, so that the design pressure of the submarine pipeline section in the air field, the long-distance tie-back sea pipeline and the deepwater riser section thereof is obviously reduced, the wall thicknesses of the deepwater riser and the tie-back sea pipeline are reduced, and the engineering investment can be greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the underwater high integrity pressure protection system provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the system for lowering the pressure in the underwater production of a deepwater oil-gas field according to embodiment 2 of the present invention;
Fig. 3 is a schematic structural diagram of an application case of the underwater production depressurization system using a deepwater oil-gas field according to embodiment 2 of the present invention.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Example 1 an underwater high integrity pressure protection system
Embodiment 1 provides an underwater high integrity pressure protection system, the structure of which is described in detail below with reference to the accompanying drawings.
The english name of the underwater high integrity pressure protection system a is "subsea HIGH INTEGRITY pressure protection system", abbreviated SHIPPS.
Referring to fig. 1, the subsea high integrity pressure protection system a comprises a mating line 1, a trigger 2, a logic solver 3, and a final execution facility 4;
The two ends of the matched pipeline 1 are respectively provided with a well inflow port 11 and a well outflow port 12, the trigger 2 is arranged at the upstream of the matched pipeline 1, the final execution facility 4 is arranged at the downstream of the matched pipeline 1, and the trigger 2 and the final execution facility 4 are respectively connected through signal lines.
Specifically, the trigger 2 includes a plurality of pressure sensors 20, and the plurality of pressure sensors 20 are disposed on the supporting pipe 1 in parallel, for measuring the pressure of the supporting pipe 1. The 3oo2 or 4oo3 mode is adopted generally, so that on the premise of not affecting the execution of the safety function, the failure of one monitoring channel can be allowed, the occurrence of misoperation is prevented, and when dangerous failures occur in a plurality of channels, the safety function failure can occur, so that the safety function has quite reliable hardware fault margin.
The logic solver 3 comprises a set of independent control modules which are respectively connected with the pressure sensor 20 of the trigger 2 and the shutoff valve 40 of the final execution facility 4 through signal lines, wherein the pressure sensor 20 collects pressure signals of the matched pipeline 1 and transmits the collected pressure signals to the control module of the logic solver 3, and the logic solver 3 judges and sends decision instructions to the shutoff valve 40 of the final execution facility 4. The logic solver 3 is the core of the subsea high integrity pressure protection system a.
The final execution facility 4 comprises two shut-off valves 40, the two shut-off valves 40 being arranged in series in the mating conduit 1 for controlling shut-off in the mating conduit 1. Each shut-off valve 40 is equipped with complete accessories and test equipment, and the overall system adopts a "one-use-one-standby" mode, is physically completely independent and redundant in multiple ways, ensures reliable serial operation, and can be effectively shut off in a very short time once triggered, thereby ensuring the safety of downstream facilities.
Example 2A pressure reducing System for submerged production of deep Water oil-gas field
Embodiment 2 provides a subsea production depressurization system for a deepwater oil-gas field, and the structure thereof is described in detail below with reference to the accompanying drawings.
Referring to fig. 2 and3, the deepwater field subsea production depressurization system comprises an oil and gas production well O, a subsea high integrity pressure protection system a of example 1, a buffer pipe segment B, a subsea pipe segment C, a riser segment D and a platform M,
The oil gas production well O stores oil gas as a high-pressure source, the submarine pipeline section C is provided with an underwater production facility and a submarine pipeline connected with the underwater production facility, the platform M is an oil gas production platform above the sea level, the deepwater vertical pipeline section D is provided with a deepwater vertical pipe, and the upper end of the deepwater vertical pipe is suspended on the platform M.
In the usual case, the outlet of the oil and gas production well O is in butt joint with the inlet of the subsea pipe section C. In order to realize the connection of the submarine pipeline section C and the platform M, a section of the submarine pipeline section C, which is close to the discharge end of the platform M, is provided with a tieback sea pipe C1, and the tieback sea pipe C1 is in butt joint with the lower end of a deepwater riser of the deepwater riser section D.
In order to control the shut-off of the flow of oil and gas in the submarine pipeline, the top of the deepwater riser suspended on the platform M is provided with a landing platform shut-off valve 5.
Since the high pressure oil gas flow of the oil and gas production well O is normally conducted through the tieback sea pipe C1 and the deepwater riser D, the pressure in the sea pipe C1 and the deepwater riser D will accumulate to the shut-in pressure in consideration of the overpressure condition. In the design stage, conservative practice is adopted, and the design pressure of the deepwater vertical pipe and the tieback sea pipe C1 is taken as the maximum shut-in pressure value P1, so that the pipe wall thickness is very large.
However, the underwater high-integrity pressure protection system A can realize depressurization in an underwater production state, so that the internal pressure of the deepwater riser of the submarine pipeline section C and the tieback sea pipe C1 thereof and the deepwater riser section D is obviously reduced and is lower than the maximum shut-in pressure value P1, and the internal pressure of the deepwater riser section D takes a seabed design pressure value P2, so that the wall thicknesses of the deepwater riser and the tieback sea pipe C1 are reduced. Wherein the subsea design pressure value P2 is numerically equal to the shut-in pressure in a conventional well. The specific method comprises the following steps:
the discharge port of the oil gas production well O is in butt joint with the well inflow port 11 of the matched pipeline 1 of the underwater high-integrity pressure protection system A;
The well flow outlet 12 of the matched pipeline 1 of the underwater high-integrity pressure protection system A is connected with the feed inlet of the submarine pipeline section C through a buffer pipeline to form a buffer pipeline section B.
The buffer pipe section B is beneficial to reducing the influence on the pressure in the submarine pipe section C after the low-temperature hydrate which occurs at the downstream in the response shutdown process of the underwater high-integrity pressure protection system A, so that the pressure of fluid flowing out of the buffer pipe section can be reduced to a submarine design pressure value P2. Specifically, in the response shutdown process of the underwater high-integrity pressure protection system A, low-temperature hydrate blockage easily occurs at the downstream, and high-pressure fluid gushes in to cause the pressure of a pipe section between the installation position of the underwater high-integrity pressure protection system A and the blockage point to rapidly rise, so that a buffer pipe section B is arranged, and the pressure of fluid flowing out of an outlet of the buffer pipe section B is reduced to a seabed design pressure value P2. The length of the buffer pipe section B is calculated through dynamic simulation according to the fluid flow rate and pressure value flowing into the well inflow port 11 of the underwater high-integrity pressure protection system a and the turn-off time of the turn-off valve 40 of the final execution facility 4.
In order to prevent internal leakage of two shut-off valves 40 of a final execution facility 4 of the underwater high-integrity pressure protection system A and pressure accumulation, the wall thickness of a deepwater riser of the deepwater riser section D is larger than that of a tie-back sea pipe C1 and also to prevent damage or casualties of facilities of a platform M caused by overpressure damage of the deepwater riser section D, meanwhile, a pressure safety valve 6 is arranged at the top of the deepwater riser upstream of the landing shut-off valve 5, and when the pressure in the deepwater riser exceeds a set critical value, the pressure safety valve 6 opens a release fluid to realize pressure release.
When the underwater production depressurization system of the deepwater oil-gas field is applied to depressurization, the system also comprises a christmas tree shutdown system, and the christmas tree shutdown system and the underwater high-integrity pressure protection system A are two mutually independent overpressure protection systems.
When the underwater high-integrity pressure protection system A works, once the overpressure is detected, the Christmas tree shutdown system is started first, and the underwater high-integrity pressure protection system A can be started only when the Christmas tree shutdown system fails to timely and effectively shut off a high-pressure source. For example, the tree shut-off pressure is 22MPaA and the subsea high integrity pressure protection system a shut-off pressure is 25MPaA.
An application example of the deepwater oil-gas field underwater production depressurization system disclosed by the invention is described below, an underwater high-integrity pressure protection system is installed for a certain production well with particularly high shut-in pressure, a corresponding buffer pipe section B and reasonable process parameter design are arranged, and on the premise of ensuring safety, the design pressures of a manifold, a conventional well jumper and a sea pipe are greatly reduced, so that the installation difficulty of the manifold is reduced, and the laying efficiency of the sea pipe is improved. Wherein, referring to fig. 3, the underwater production facility comprises a south manifold, a sea pipe, a north manifold, an underwater service barrel and a pipeline terminal which are sequentially connected, wherein the south manifold comprises a plurality of well jumper pipes, the north manifold comprises a plurality of well jumper pipes, the underwater production facility and the tieback sea pipe C1 are mutually connected to form a submarine pipeline network, the design pressure in the submarine pipeline network is the closing pressure in a conventional well, and the pressure value of the submarine pipeline network is equal to the submarine design pressure value P2. In a specific example, the subsea design pressure value p2=38.2 MPaA, the pipeline terminal is communicated with the deepwater riser of the deepwater riser section D through a tie-back sea pipe C1, the length of the tie-back sea pipe C1 is 113Km, the internal pressure of the tie-back sea pipe C1 is 38.2MPaA, and the length of a connecting pipe from a south manifold to a north manifold sea pipe is 5.7Km.
In the use process, in order to ensure normal operation and monitor the operation state, periodic tests are needed, including short-frequency tests and full-function tests. The short-frequency test is usually carried out for 3-6 months, and comprises a valve part stroke test, a pressure sensor test and the like, so that the on-line production test can be carried out without shutting down the gas well. The full-function test is carried out once a year, and comprises a shut-off pressure response test, a shut-off valve tightness test and the like, wherein the shut-in of a wellhead of the connected underwater high-integrity pressure protection system A is stopped in the test process.
Example 3 depressurization method of a depressurization System for subsea production in a deep Water oil-gas field
Embodiment 3 provides a depressurization method of a subsea production depressurization system for a deepwater oil and gas field, which adopts the subsea production depressurization system for the deepwater oil and gas field provided in embodiment 2, and in combination with fig. 3, the method comprises the following steps:
And S1, selecting an oil gas production well O with high well closing pressure as a target well according to reservoir characteristics of each block of the gas field, oil reservoir production allocation and well position distribution.
Step S2, calculating the length of the buffer pipe section B through dynamic simulation according to the fluid flow rate and the pressure value of the fluid flowing in through the well inflow port 11 of the underwater high-integrity pressure protection system A and the turn-off time of the turn-off valve 40 of the final execution facility 4.
Specifically, referring to fig. 3, the design pressures of the submarine pipeline section C and the deep water riser D are the submarine design pressure value P2, specifically, the submarine design pressure value p2=38.2 MPaA, the design pressures in the pipeline at the junction of the well inflow port 11 and the buffer section of the submarine high-integrity pressure protection system a and the submarine pipeline section C are the maximum shut-in pressure value P1, specifically, the maximum shut-in pressure value p1=58.8 MPaA, and the buffer pipeline section B can realize stable transition of the design pressure from the high-pressure well maximum shut-in pressure P1 to the shut-in pressure in the conventional well, so that the influence on the submarine pipeline section C design pressure after the low-temperature hydrate is blocked in the downstream of the submarine high-integrity pressure protection system a in response to shutdown is reduced.
And step S3, abutting the discharge hole of the target well with the well inflow port 11 of the matched pipeline 1 of the underwater high-integrity pressure protection system A, and communicating the well inflow port 12 of the matched pipeline 1 of the underwater high-integrity pressure protection system A with the feed hole of the submarine pipeline section C through the buffer pipeline section B to finish the installation of the underwater high-integrity pressure protection system A.
And S4, setting the pipe wall thickness of the deepwater vertical pipe to be larger than the pipe wall thickness of the tie-back sea pipe C1.
Specifically, the outer diameter of the deepwater vertical pipe is 508mm, the pipe wall thickness of the deepwater vertical pipe is 34.9mm according to the two-zone standard design, and the pipe wall thickness of the tieback sea pipe C1 is 31.8mm.
And S5, setting a landing platform shutoff valve 5 at the outlet of the deepwater riser suspended on the platform M, and setting a pressure safety valve 6 at the top of the deepwater riser at the upstream of the landing platform shutoff valve 5.
Specifically, the opening pressure of the pressure relief valve 6 is set to 34MPaA, and even if the two shut-off valves 40 of the final execution facility 4 leak inside the valve, the subsea production facility pressure accumulation does not exceed the subsea design pressure value P2, i.e., 38.2MPaA.
When the underwater high-integrity pressure protection system A works, once an overpressure working condition occurs, the Christmas tree shutdown system is started first, and the underwater high-integrity pressure protection system A can be started only when the Christmas tree shutdown system fails to timely and effectively cut off a high-pressure source.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (7)
1. The underwater production depressurization system for the deepwater oil-gas field comprises an oil-gas production well (O), a submarine pipeline section (C), a deepwater riser section (D) and a platform (M), wherein a section of the submarine pipeline section (C) close to the discharge end of the platform (M) is provided with a tie-back sea pipe (C1), the deepwater riser section (D) is provided with a deepwater riser, the tie-back sea pipe (C1) is in butt joint with the lower end of the deepwater riser section (D), the upper end of the deepwater riser is hung on the platform (M), and the underwater production depressurization system is characterized by further comprising an underwater high-integrity pressure protection system (A) and a buffer pipe section (B),
The underwater high-integrity pressure protection system (A) comprises a matched pipeline (1), a trigger (2), a logic solver (3) and a final execution facility (4),
The two ends of the matched pipeline (1) are respectively provided with a well flow inlet (11) and a well flow outlet (12), the trigger (2) is arranged at the upstream of the matched pipeline (1), the final execution facility (4) is arranged at the downstream of the matched pipeline (1), and the trigger (2) and the final execution facility (4) are respectively connected through signal lines;
The trigger (2) comprises a plurality of pressure sensors (20), and the pressure sensors (20) are arranged on the matched pipeline (1) in parallel and are used for measuring the pressure of the matched pipeline (1);
The final execution facility (4) comprises two shutoff valves (40), and the two shutoff valves (40) are arranged in the matched pipeline (1) in series and are used for controlling the shutoff in the matched pipeline (1);
The logic solver (3) comprises a set of independent control modules which are respectively connected with a pressure sensor (20) of the trigger (2) and a shutoff valve (40) of the final execution facility (4) through signal lines, wherein the pressure sensor (20) collects pressure signals of the matched pipeline (1) and transmits the collected pressure signals to the control module of the logic solver (3), and the logic solver (3) judges and sends decision instructions to the shutoff valve (40) of the final execution facility (4);
The discharge port of the oil gas production well (O) is in butt joint with a well inflow port (11) of a matched pipeline (1) of the underwater high-integrity pressure protection system (A);
The well flow outlet (12) of the matched pipeline (1) of the underwater high-integrity pressure protection system (A) is connected with the feed inlet of the submarine pipeline section (C) through a buffer pipeline to form the buffer pipeline section (B).
2. Subsea production depressurization system in deepwater oil and gas field according to claim 1 characterized in that landing platform shut-off valve (5) is provided at the upper end of the deepwater riser section (D) suspended on the platform (M).
3. The subsea production depressurization system of a deepwater oil and gas field of claim 2,
The top of the deepwater vertical pipe at the upstream of the landing platform shutoff valve (5) is provided with a pressure safety valve (6), and when the pressure in the deepwater vertical pipe exceeds a set critical value, the pressure safety valve (6) opens the release fluid to realize pressure relief.
4. The subsea production depressurization system of a deepwater oil and gas field of claim 3,
The wall thickness of the deepwater riser is greater than that of the tieback sea pipe (C1).
5. The subsea production depressurization system of a deepwater oil and gas field of claim 4 further comprising a tree shut-off system, said tree shut-off system and said subsea high integrity pressure protection system (a) being two independent overpressure protection systems.
6. Method for depressurizing a deepwater oil and gas field subsea production facility using a deepwater oil and gas field subsea production depressurization system according to any of claims 1-5, characterized by comprising the steps of:
According to reservoir characteristics of each block of the gas field, oil reservoir production allocation and well position distribution, selecting an oil gas production well (O) with high well closing pressure as a target well;
Calculating the length of the buffer pipe section (B);
the discharge hole of the target well is in butt joint with a well inflow port (11) of a matched pipeline (1) of the underwater high-integrity pressure protection system (A), a well outflow port (12) of the matched pipeline (1) of the underwater high-integrity pressure protection system (A) is communicated with a feed port of a submarine pipeline of the submarine pipeline section (C) through a buffer pipeline section (B), and the installation of the underwater high-integrity pressure protection system (A) is completed;
Setting the pipe wall thickness of the deepwater vertical pipe to be larger than the pipe wall thickness of the tie-back sea pipe (C1);
A landing platform shutoff valve (5) is arranged at the upper end of the deepwater riser suspended on the platform (M), and a pressure safety valve (6) is arranged at the top of the deepwater riser at the upstream of the landing platform shutoff valve (5).
7. The method of claim 6, wherein the step of providing the first layer comprises,
When the underwater high-integrity pressure protection system (A) works, once an overpressure working condition occurs, the Christmas tree shutdown system is started first, and the underwater high-integrity pressure protection system (A) can be started only when the Christmas tree shutdown system fails to effectively cut off a high-pressure source, so that the safety of downstream production facilities is protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210146904.XA CN114542051B (en) | 2022-02-17 | 2022-02-17 | A deepwater oil and gas field underwater production pressure reduction system and pressure reduction method |
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| CN116123453A (en) * | 2022-11-01 | 2023-05-16 | 中国海洋石油集团有限公司 | A high pour point oil subsea production manifold |
| CN115855158A (en) * | 2022-12-12 | 2023-03-28 | 中国海洋石油集团有限公司 | Function detection and recovery device and method for underwater high-integrity pressure protection system |
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| CN203857269U (en) * | 2014-03-25 | 2014-10-01 | 何建中 | Open type deepwater oil gas transmission system |
| US20180156004A1 (en) * | 2016-12-02 | 2018-06-07 | Onesubsea Ip Uk Limited | Integrated well system asset and high integrity pressure protection |
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| CN113863901B (en) * | 2021-08-10 | 2023-11-28 | 海洋石油工程股份有限公司 | Method for constructing functional loop of underwater high-integrity pressure protection device |
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