CN112593902A - Pre-charging nitrogen replacement system for deep-water submarine pipeline and replacement time estimation method - Google Patents
Pre-charging nitrogen replacement system for deep-water submarine pipeline and replacement time estimation method Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 258
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 125
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 55
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003345 natural gas Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims description 84
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 13
- 238000011161 development Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000005680 Thomson effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
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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
- E21B41/005—Waste disposal systems
- E21B41/0071—Adaptation of flares, e.g. arrangements of flares in offshore 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a nitrogen replacement system and a nitrogen replacement time estimation method for a deepwater submarine pipeline pre-filled, wherein a component tracking model is established according to the yield of an underwater wellhead, the length of an underwater production pipeline, the diameter of the underwater production pipeline and the pressure of pre-filled nitrogen in the underwater production pipeline, after a target value of nitrogen content is set, the nitrogen replacement time can be estimated, the time consumed for replacing nitrogen by natural gas-containing fluid produced by the underwater wellhead in the deepwater submarine pipeline and reducing the nitrogen content to a target range can be estimated, the condition that the nitrogen content is required to be reduced by the gas conveyed to the downstream can be met is ensured, meanwhile, the nitrogen replacement time for quantitatively replacing nitrogen can play a role in saving energy and avoiding energy waste, in addition, the influence of different underwater wellhead yields on the nitrogen replacement time can be analyzed by utilizing the model, and the nitrogen replacement time estimation method can be popularized to the, The deep water oil and gas field development project with higher nitrogen pre-charging pressure has wide application prospect.
Description
Technical Field
The invention relates to a production flow of marine petroleum engineering, in particular to a pre-filling nitrogen replacement system for a deep-water submarine pipeline and a replacement time estimation method.
Background
The well head under deep water is high in closing pressure generally, the water temperature of the seabed environment is low, and low temperature is easily generated at the downstream of an oil nozzle in the well opening process due to the Joule Thomson effect, so that low-temperature impact damage is caused to underwater equipment; in order to improve the downstream temperature of an underwater wellhead choke in the well opening process, nitrogen with a certain pressure is pre-filled in a submarine pipeline before general production, so that the choke and pressure reduction of the choke are avoided to generate low temperature.
In the prior art, generally, during production, an underwater wellhead production fluid is used for replacing pre-filled nitrogen in a deep-water submarine pipeline in an underwater production pipeline, the replaced gas can be ignited by an incandescent lamp, and then the submarine pipeline outlet production fluid can be transferred to a platform output processing system for processing, wherein the underwater wellhead production fluid comprises gaseous natural gas and is conveyed to a downstream power plant through the platform output processing system; in practice, in some projects, downstream power plant users have special requirements on the nitrogen content index of natural gas, and the natural gas can be delivered to the downstream power plant when the nitrogen content of the natural gas at the outlet of the submarine pipeline reaches the standard.
In order to avoid dispute between two parties of a contract due to the content of natural gas and nitrogen, the conventional qualitative analysis according to the gas combustion condition determines that the time for converting the production fluid at the outlet of the submarine pipeline to a platform output processing flow can not meet the actual requirement; the change condition of the nitrogen content at the outlet of the submarine pipeline needs to be quantitatively analyzed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for quantitatively analyzing the nitrogen pre-filling replacement time of a deep-water submarine pipeline and estimating the time for replacing nitrogen.
In order to solve the technical problem, the invention provides a pre-charging nitrogen replacement system for a deepwater submarine pipeline, which comprises an underwater production pipeline, an output processing system, a nitrogen processing system and a multiphase separator, wherein the output processing system, the nitrogen processing system and the multiphase separator are positioned on an offshore platform, the underwater production pipeline for connecting an underwater wellhead is communicated with the multiphase separator, the output processing system comprises a natural gas processing system and a condensate processing system which are connected to the multiphase separator through pipelines, and the nitrogen processing system is communicated with the multiphase separator through a pipeline.
The further improvement lies in that: the underwater production pipeline comprises a submarine pipeline, a deep water riser and an offshore platform pipeline which are connected in sequence.
The further improvement lies in that: it still includes first control valve, second control valve and third control valve, and first control valve sets up and is connecting on natural gas processing system's the pipeline, the second control valve sets up and is connecting on nitrogen gas processing system's the pipeline, the third control valve sets up and is connecting on condensate processing system's the pipeline, still be provided with pressure transmitter and liquid level transmitter on the heterogeneous separator, pressure transmitter electricity is connected first control valve with second control valve and control first control valve with opening or closing of second control valve, liquid level transmitter electricity is connected third control valve and control opening or closing of third control valve.
The invention also provides a method for estimating the pre-charging nitrogen replacement time of the deepwater submarine pipeline, which comprises the following steps:
s1: before opening a well at an underwater wellhead, filling nitrogen with preset pressure into a submarine pipeline;
s2: counting the design data of the underwater production pipeline and determining the processing capacity of the nitrogen processing system;
s3: establishing a component tracking model by taking nitrogen as an index according to the open well yield of an underwater wellhead, the pressure of the nitrogen in the underwater production pipeline, the design data of the underwater production pipeline and the processing capacity of the nitrogen processing system;
s4: analyzing the change of the nitrogen content in the multiphase separator along with the time under the open-hole production through the component tracking model;
s5: determining the nitrogen content requirement entering the natural gas processing system, and calculating the nitrogen replacement time according to the nitrogen content requirement.
The further improvement lies in that: the design data of the subsea production line described in step S2 includes the length and diameter of the subsea production line, which is the length of the pipeline from the subsea wellhead to the multiphase separator.
The further improvement lies in that: the component tracking model in step S3 is created by using OLGA dynamic simulation software.
The further improvement lies in that: in step S3, the well opening output is less than or equal to the processing capacity of the nitrogen gas processing system, and the processing capacity of the nitrogen gas processing system is the maximum total amount of gas that can be processed by the nitrogen gas processing system in unit time.
The invention has the technical effects that: 1. the invention relates to a deepwater submarine pipeline pre-charging nitrogen replacement system, which comprises an underwater production pipeline, an output processing system, a nitrogen processing system and a multiphase separator, wherein the output processing system, the nitrogen processing system and the multiphase separator are positioned on an offshore platform, the underwater production pipeline for connecting an underwater wellhead is communicated with the multiphase separator, the output processing system comprises a natural gas processing system and a condensate oil processing system which are connected with the multiphase separator through pipelines, the nitrogen processing system is communicated with the multiphase separator through pipelines, nitrogen with a certain pressure value can be pre-charged in the underwater production pipeline before the underwater wellhead is opened and put into production, the temperature of the downstream of an oil nozzle of the underwater wellhead in the well opening process is improved, the low temperature generated by throttling and depressurizing the oil nozzle is avoided, and the low-temperature impact damage to underwater equipment is caused, the nitrogen treatment system is arranged to treat the gas containing nitrogen until the nitrogen replacement is completed, so that the quality of the fluid entering the output treatment system is improved, and the content of the nitrogen is reduced.
2. The estimation method of the deep water submarine pipeline nitrogen pre-charging replacement time of the invention can estimate the nitrogen replacement time after setting the target value of the nitrogen content according to the component tracking model established by the yield of the underwater wellhead, the length of the underwater production pipeline, the diameter of the underwater production pipeline and the pressure of the pre-charging nitrogen in the underwater production pipeline, can estimate the time consumed by replacing the nitrogen with the natural gas produced by the underwater wellhead and reducing the nitrogen content to the target range, ensures that the gas conveyed to the downstream meets the requirement of the nitrogen content, can save energy and avoid energy waste by quantifying the replacement time of the replaced nitrogen, can also analyze the influence of the yields of different underwater wellheads on the nitrogen replacement time by utilizing the model, and can be popularized to the development project of deep water oil and gas fields with deeper water depth, farther distance and higher nitrogen pre-charging pressure, has wide application prospect.
3. In the estimation method for the pre-charging nitrogen replacement time of the deepwater submarine pipeline, the yield of the underwater wellhead is less than or equal to the processing capacity of the nitrogen processing system, and the situation that the yield exceeds the processing capacity of the nitrogen processing system during nitrogen replacement can be avoided, so that the production safety is ensured and the environmental pollution is reduced.
Drawings
FIG. 1 is a flow chart of the estimation method of the nitrogen replacement time of the pre-filling of the deep-water submarine pipeline;
fig. 2 is a schematic diagram of the nitrogen displacement system of the deep-water subsea pipeline of the present invention.
The main reference numbers in the figures illustrate:
100-nitrogen replacement system, 1-underwater production pipeline, 2-output processing system, 3-nitrogen processing system, 4-multiphase separator, 5-underwater wellhead, 6-first control valve, 7-second control valve, 8-third control valve, 11-submarine pipeline, 12-deepwater riser, 13-offshore platform pipeline, 21-natural gas processing system, 22-condensate processing system, 41-pressure transmitter and 42-liquid level transmitter.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Fig. 2 is a schematic diagram of the nitrogen displacement system for the deepwater subsea pipeline of the present invention, and as shown in fig. 2, the deepwater subsea pipeline pre-charging nitrogen displacement system 100 comprises a subsea production pipeline 1, and an output processing system 2, a nitrogen processing system 3 and a multiphase separator 4 which are located on an offshore platform, wherein the subsea production pipeline 1 for connecting to a subsea wellhead 5 is communicated with the multiphase separator 4, the output processing system 2 comprises a natural gas processing system 21 and a condensate processing system 22 which are connected to the multiphase separator 4 by pipelines, and the nitrogen processing system 3 is communicated with the multiphase separator 4 by pipelines.
The pre-filled nitrogen replacement system 100 for the deepwater subsea pipeline can replace pre-filled nitrogen in the deepwater subsea pipeline by using fluid produced by the subsea wellhead 5, as shown in fig. 2, the direction of an arrow indicates the flow direction of the fluid in the subsea production pipeline 1, the gas and the liquid are stored and separated by using the multiphase separator 4, the nitrogen-containing gas is processed by arranging the nitrogen processing system 3 until the nitrogen replacement is completed and the nitrogen processing system 3 is closed, so that the quality of the fluid entering the output processing system 2 is improved, and the content of the nitrogen is reduced.
The further improvement lies in that: the underwater production pipeline 1 comprises a submarine pipeline 11, a deepwater riser 12 and an offshore platform pipeline 13 which are sequentially connected, as shown in fig. 2, the submarine pipeline 11 is positioned on the seabed, one end of the submarine pipeline 11 is communicated with each underwater wellhead 5, fluid produced by the underwater wellheads 5 is conveyed to the deepwater riser 12, the deepwater riser 12 is connected with the offshore platform pipeline 13, the offshore platform pipeline 13 is communicated with the multiphase separator 4, and after the underwater wellheads 5 open the well, the produced fluid is conveyed to the offshore platform to replace nitrogen originally positioned in the underwater production pipeline 1 and conveyed to the inside of the multiphase separator 4 for processing.
Referring to fig. 2, the nitrogen replacement system 1 for the deep-water submarine pipeline further comprises a first control valve 6, a second control valve 7 and a third control valve 8, the first control valve 6 is arranged on a pipeline connected with the natural gas treatment system 21, the second control valve 7 is arranged on a pipeline connected with the nitrogen treatment system 3, the third control valve 8 is arranged on a pipeline connected with the condensate treatment system 22, the multiphase separator 4 is further provided with a pressure transmitter 41 and a liquid level transmitter 42, the pressure transmitter 41 is electrically connected with the first control valve 6 and the second control valve 7 and controls the first control valve 6 and the second control valve 7 to be opened or closed, and the liquid level transmitter 42 is electrically connected with the third control valve 8 and controls the third control valve 8 to be opened or closed, so that a nitrogen replacement flow can be conveniently controlled.
Fig. 1 is a flowchart of the estimation method of the pre-filled nitrogen replacement time of the deep-water submarine pipeline according to the present invention, and referring to fig. 1, the present invention further provides the estimation method of the pre-filled nitrogen replacement time of the deep-water submarine pipeline, including the pre-filled nitrogen replacement system of the submarine pipeline according to the present invention, which includes the following steps:
s1: before a well is opened at an underwater wellhead, nitrogen with preset pressure is filled into an underwater production pipeline 1; before the underwater wellhead 5 is opened for production, nitrogen with a certain pressure value is pre-charged in the underwater production pipeline 1, the downstream temperature of the underwater wellhead 5 oil nozzle in the well opening process is improved, the low temperature generated by throttling and depressurizing of the oil nozzle is avoided, and the effect of low-temperature impact damage to underwater equipment is avoided.
S2: counting the design data of the underwater production pipeline 1, and determining the processing capacity of the nitrogen processing system; wherein the design information of the subsea production line 1 comprises the length and diameter of the subsea production line 1, the length of the subsea production line 1 being the line length from the subsea wellhead 5 to the multiphase separator 4.
S3: establishing a component tracking model by taking nitrogen as an index according to the well opening output of an underwater wellhead 5, the pressure of the nitrogen in an underwater production pipeline 1, design data of the underwater production pipeline 1 and the processing capacity of a nitrogen processing system 3;
the component tracking model is established by adopting OLGA dynamic simulation software. The OLGA dynamic simulation software is a leading full-dynamic multiphase flow simulation calculation program in the world, can simulate the motion states of oil, gas and water in an oil well, an oil pipeline and oil and gas processing equipment, is widely applied to feasibility research, engineering design and operation simulation, and comprises a component tracking module, wherein the component tracking module can determine the dynamic change of fluid components and the distribution of each component along the pipeline. In the invention, the component tracking module is established by taking nitrogen as an index.
It should be noted that the open-hole output of the underwater wellhead 5 needs to be less than or equal to the processing capacity of the nitrogen processing system 3, the processing capacity of the nitrogen processing system 3 is the maximum total amount of gas that can be processed by the nitrogen processing system 3 in a unit time, and the nitrogen replacement can be avoided from exceeding the processing capacity of the nitrogen processing system 3. The yield of the underwater wellhead 5 is within the processing capacity range of the flare system, so that the condition that the thermal radiation of the flare is overproof can be avoided.
S4: analyzing the change of the nitrogen content in the multiphase separator along with the time under the well-opening yield through a component tracking model;
s5: the nitrogen content requirement into the natural gas processing system 21 is determined and the nitrogen substitution time is calculated based on the nitrogen content requirement.
According to the estimation method for the nitrogen replacement time of the pre-filled deep-water submarine pipeline, the nitrogen content requirement of the natural gas treatment system 21 is set according to the component tracking model established by the yield of the underwater wellhead 5, the length of the underwater production pipeline 1, the diameter of the underwater production pipeline 1 and the pressure of the pre-filled nitrogen in the underwater production pipeline 1, the estimation of the nitrogen replacement time can be carried out after the target value of the nitrogen content is set, the time consumed by replacing nitrogen with natural gas-containing fluid produced by the underwater wellhead 5 in the deep-water submarine pipeline and reducing the nitrogen content to a target range can be estimated, the gas conveyed to the natural gas treatment system 21 can be ensured to meet the nitrogen content requirement, and meanwhile, the effects of saving energy and avoiding energy waste can be achieved by quantifying the replacement time of the replaced nitrogen.
In addition, the model in the invention can be used for analyzing the influence of the yield of different underwater wellheads on the nitrogen replacement time, can be popularized to deep water oil and gas field development projects with deeper water depth, farther distance and higher nitrogen pre-charging pressure, and has wide application prospect.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. The utility model provides a deep water submarine pipeline fills nitrogen gas replacement system in advance which characterized in that: including the underwater production pipeline and be located offshore platform's output processing system, nitrogen gas processing system and heterogeneous separator for connect the underwater wellhead the underwater production pipeline intercommunication heterogeneous separator, output processing system includes the pipe connection and is in natural gas processing system and condensate oil processing system on the heterogeneous separator, nitrogen gas processing system pipeline intercommunication heterogeneous separator.
2. The deep water subsea pipeline pre-filled nitrogen displacement system of claim 1, wherein: the underwater production pipeline comprises a submarine pipeline, a deep water riser and an offshore platform pipeline which are connected in sequence.
3. The deep water subsea pipeline pre-filled nitrogen displacement system of claim 1, wherein: it still includes first control valve, second control valve and third control valve, and first control valve sets up and is connecting on natural gas processing system's the pipeline, the second control valve sets up and is connecting on nitrogen gas processing system's the pipeline, the third control valve sets up and is connecting on condensate processing system's the pipeline, still be provided with pressure transmitter and liquid level transmitter on the heterogeneous separator, pressure transmitter electricity is connected first control valve with second control valve and control first control valve with opening or closing of second control valve, liquid level transmitter electricity is connected third control valve and control opening or closing of third control valve.
4. A method for estimating the pre-charging nitrogen replacement time of a deep-water submarine pipeline, comprising the system for pre-charging nitrogen replacement of a submarine pipeline according to any one of claims 1 to 3, and comprising the steps of:
s1: before opening a well at an underwater wellhead, filling nitrogen with preset pressure into a submarine pipeline;
s2: counting the design data of the underwater production pipeline and determining the processing capacity of the nitrogen processing system;
s3: establishing a component tracking model by taking nitrogen as an index according to the open well yield of an underwater wellhead, the pressure of the nitrogen in the underwater production pipeline, the design data of the underwater production pipeline and the processing capacity of the nitrogen processing system;
s4: analyzing the change of the nitrogen content in the multiphase separator along with the time under the open-hole production through the component tracking model;
s5: determining the nitrogen content requirement entering the natural gas processing system, and calculating the nitrogen replacement time according to the nitrogen content requirement.
5. The pre-charge nitrogen replacement time estimation method according to claim 4, wherein: the design data of the subsea production line described in step S2 includes the length and diameter of the subsea production line, which is the length of the pipeline from the subsea wellhead to the multiphase separator.
6. The pre-charge nitrogen replacement time estimation method according to claim 4, wherein: the component tracking model in step S3 is created by using OLGA dynamic simulation software.
7. The pre-charge nitrogen replacement time estimation method according to claim 4, wherein: in step S3, the well opening output is less than or equal to the processing capacity of the nitrogen gas processing system, and the processing capacity of the nitrogen gas processing system is the maximum total amount of gas that can be processed by the nitrogen gas processing system in unit time.
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| CN107989578A (en) * | 2016-10-27 | 2018-05-04 | 中国石油天然气股份有限公司 | Liquid discharge system and method of recyclable nitrogen jet pump of coiled tubing |
| CN206580559U (en) * | 2017-03-16 | 2017-10-24 | 山东东方宏业化工有限公司 | A kind of multichannel nitrogen recycling pressurizer |
| CN209997412U (en) * | 2019-05-17 | 2020-01-31 | 四川开元科技有限责任公司 | device for respectively recovering acetylene and nitrogen from waste gas displaced by acetylene generator |
| CN210458081U (en) * | 2019-07-08 | 2020-05-05 | 宜都市兴业工贸有限公司 | Cryogenic nitrogen removal process production line for nitrogen-containing natural gas |
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