CN103867900A - Method for simulating flow safety assurance of oil-gas-water mixture transportation pipeline with high height difference - Google Patents
Method for simulating flow safety assurance of oil-gas-water mixture transportation pipeline with high height difference Download PDFInfo
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- CN103867900A CN103867900A CN201410091599.4A CN201410091599A CN103867900A CN 103867900 A CN103867900 A CN 103867900A CN 201410091599 A CN201410091599 A CN 201410091599A CN 103867900 A CN103867900 A CN 103867900A
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Abstract
The invention discloses a method for simulating the flow safety assurance of an oil-gas-water mixture transportation pipeline with high height difference. The method comprises the following steps (1), (2), (3), (4) and/or (5): (1) determining whether to fill a hydrate inhibitor or not according to the temperature condition of the interior of the oil-gas-water mixture transportation pipeline with high height difference; (2) controlling the time that an oil phase, a water phase and the hydrate inhibitor do not flow out from the outlet of the oil-gas-water mixture transportation pipeline according to the process that balance is established between the oil phase and the water phase in the oil-gas-water mixture transportation pipeline during production working condition initial stage; (3) determining the influence of situation changes on the outlet parameters of the mixture transportation pipeline according to the situation changes of throughput and delivery pressure in the oil-gas-water mixture transportation pipeline with high height difference during the oil field production period; (4) transporting supplementary throughput in a circulating manner by use of a platform circulating device under a low-throughput working condition; (5) controlling and regulating a circulating pipeline cleaning path and a circulating pipeline cleaning mode. The method can be used for reducing the influence of the dynamic changes of the oil-gas-water mixture transportation pipeline with high height difference on downstream equipment facilities, optimizing the downstream equipment scale of the pipeline and reducing the investment.
Description
Technical field
The present invention relates to a kind of method of simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee.
Background technique
In marine oil and gas development of resources, it is the defeated major way of offshore oil and gas water transport that pipeline is carried, and therefore submarine pipeline is the important component part of marine engineering facility, and the mobile safety guarantee design of submarine pipeline is the key factor that affects marine oil and gas development of resources.
The exploitation in deep water gas field, due to the impact of the depth of water and distance, the mobile safety guarantee problem of the pipeline of the especially large discrepancy in elevation mixed transportation of oil and gas of submarine pipeline is more outstanding, in design process, must solve the problem there will not be in some shallow sea piping design processes.
3-1 gas field, Li Gulf is a deep water gas field that is positioned at South China Sea, and depth of water 1450m is the deep water gas field of finding first in China Seas.Engineering development is according to regional development thinking, 3-1 gas field, Li Gulf arranges subsea production system, and shallow water compression processing center is set up in northwest, 3-1 gas field, Li Gulf to 200m depth of water place, underwater well head is apart from shallow water supercharging platform apart from 75km, and the oil gas water that 3-1 gas field, Li Gulf deep water natural gas line is produced underwater well head relies on well head pressure to be delivered to shallow water pressurized treatment center processing by the submarine pipeline of 2 22in.Due to the different in kind of liquid phase, its flowing velocity and distribution in pipeline can be subject to the impact of the factors such as pipeline elevation parameter, flow, the pressure and other parameters of pipeline exit can form dynamic change, thereby cause the impact on upstream device, for the large discrepancy in elevation multiphase pipeline in the exploitation of 3-1 deep water hydrocarbon field, Li Gulf, the mobile safety guarantee design method that need to seek a kind of system reduces the defeated risk of pipe, ensures the exploitation of petroleum resources, is very important.
Summary of the invention
The object of this invention is to provide a kind of method of simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee, the method is applicable to large discrepancy in elevation mixed transportation of oil and gas pipeline, is convenient to the mobile safety guarantee design of deepwater offshore fields.
A kind of method of simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee provided by the present invention, comprises the step of (1), (2), (3), (4) and/or (5) as follows:
(1) according to the temperature conditions in large discrepancy in elevation mixed transportation of oil and gas pipeline, determine whether to inject hydrate inhibitor;
(2) at the operation operating mode initial stage, according to the process of oil phase and water equilibrium establishment in large discrepancy in elevation mixed transportation of oil and gas pipeline, determine the time that described large discrepancy in elevation mixed transportation of oil and gas pipe outlet does not have oil phase, water and hydrate inhibitor to flow out; According to the injection amount of described hydrate inhibitor, determine the storage volume of the downstream installation hydrate inhibitor being connected with described large discrepancy in elevation mixed transportation of oil and gas pipeline;
(3), during field produces, according to the situation of change of throughput rate and discharge pressure in large discrepancy in elevation mixed transportation of oil and gas pipeline, determine its impact on described large discrepancy in elevation mixed transportation of oil and gas pipe outlet parameter;
(4), under low throughput rate operating mode, utilize the circulation of platform circulation means to carry and supplement throughput rate, to reduce the hydrops in large discrepancy in elevation mixed transportation of oil and gas pipeline;
(5) determine circulation cleaning canal path and circulation pigging mode, operate the impact on downstream operating mode with the pigging that reduces large discrepancy in elevation mixed transportation of oil and gas pipeline.
In above-mentioned method, the height difference of described large discrepancy in elevation mixed transportation of oil and gas pipeline is 300～1500 meters.
In above-mentioned method, in step (1), if the fluid temperature (F.T.) that described large discrepancy in elevation mixed transportation of oil and gas pipeline is carried during lower than at least 5 DEG C of the generation temperature of hydrate, need to be injected described hydrate inhibitor.
In above-mentioned method, in step (2), controlling described large discrepancy in elevation mixed transportation of oil and gas pipe outlet does not have the delivery time of water and hydrate inhibitor to be less than 100 hours, does not have the delivery time of oil phase to be less than 60 hours.
In above-mentioned method, in step (2), there is no the delivery time (representing with T) of water and oil phase according to the described large discrepancy in elevation mixed transportation of oil and gas pipe outlet of determining, and the injection amount (representing with Q) of described hydrate inhibitor of determining, determine the storage volume (being Q × T) of the downstream installation hydrate inhibitor that described large discrepancy in elevation mixed transportation of oil and gas pipeline is connected.
In above-mentioned method, in step (3), the increasing degree of controlling throughput rate in described large discrepancy in elevation mixed transportation of oil and gas pipeline is not more than 25%, and the reduction amplitude of discharge pressure is not more than 25%.
In above-mentioned method, in step (4), described platform circulation means comprises 2 pipelines that are connected, and 2 described pipelines form loop.
In above-mentioned method, in step (5), spherical pig transmitterreceiver appliance is arranged on the downstream installation that described large discrepancy in elevation mixed transportation of oil and gas pipeline is connected, and the speed of controlling spherical pig is 1～5 meter per second.
In method of the present invention, the downstream installation being connected with described large discrepancy in elevation mixed transportation of oil and gas pipeline can be offshore platform, land terminal or the floating process units of executing.
The present invention has the following advantages:
1, the method for mobile safety guarantee provided by the invention, can system comprehensively plan the mobile safety guarantee scheme of deep water hydrocarbon field large discrepancy in elevation mixed transportation of oil and gas pipeline, reduce the conveying risk of large discrepancy in elevation mixed transportation of oil and gas submarine pipeline, improve the safety guarantee of oil field development.
2, the present invention is applicable to the oil-gas field development pattern of underwater well head+central platform or Floating Production treatment facility, reduce submarine pipeline carry in risk can Optimization Platform area, improve the impact of submarine pipeline on upstream device, improve submarine pipeline operational reliability.The design's method repeatedly, for the design of the mobile safety guarantee of submarine pipeline, has ensured the exploitation in multiple middle deep water gas field.The present invention can be widely used in the mobile safety guarantee design of deep water hydrocarbon field large discrepancy in elevation mixed transportation of oil and gas pipeline, and system is comprehensive, has a extensive future.
3, the impact of the dynamic change that this method can reduce large discrepancy in elevation mixed transportation of oil and gas pipeline on upstream device facility, optimizes pipe downstream equipment scale, reduces investment;
4, the present invention can be applicable to the relevant fields such as terrestrial pipeline, has a extensive future.
Brief description of the drawings
Fig. 1 is the schematic diagram utilizing while circulating pigging in the inventive method.
Embodiment
The method using in following embodiment if no special instructions, is conventional method.
Material, reagent etc. used in following embodiment, if no special instructions, all can obtain from commercial channels.
Set up pipeline OLGA simulation model according to pipeline data with along journey environmental conditions, according to oil gas field production logistics component data, judge Hydrate Formation Conditions, and contrast along journey temperature and pressure with pipeline, generate 5 DEG C of temperature if manage defeated temperature under the defeated pressure condition of pipe lower than hydrate, need to inject hydrate inhibitor and prevent that hydrate from generating blocking pipe, and in model, add a certain amount of hydrate inhibitor, reduce Hydrate Formation Conditions, guarantee that under the defeated pressure condition of pipe, managing defeated temperature generates 5 DEG C of temperature higher than hydrate.
Because large discrepancy in elevation gas-liquid delivery pipeline is in the time starting, in pipeline, liquid phase reaches after certain cumulant, pipe outlet just has liquid and flows out, and hydrate inhibitor major part all exists in water, therefore need to simulate the time of pipe outlet oil phase, water and the hydrate inhibitor arrival of pipeline start operating performance.Original state before model pipeline starts, be the gas that is full of certain pressure in pipeline, then the oil gas water that makes oil gas field produce enters gassiness pipeline, the process of oil phase and water equilibrium establishment in simulation pipeline start operating performance pipeline, determine the time (T) that pipe outlet oil phase and water flow out: controlling described pipe outlet does not have the delivery time of water to be less than 100 hours, does not have the delivery time of oil phase to be less than 60 hours; According to hydrate inhibitor injection amount (Q, m3/h), determine whether the storage volume (Q × T) of pipe downstream hydrate inhibitor can meet the demands, determine that the delivery time of hydrate inhibitor is less than 100 hours.
The variation tendency of analyzing oil and gas real estate amount and well head pressure, judge whether oil gas field production period has the operating mode that throughput rate raises or discharge pressure reduces, in model, change relevant parameter, simulation throughput rate and pressure change the variation of operating mode pipe outlet fluid flow, and design pipe downstream slug catcher size according to changing value (Q2-Q1) and the transformation period (t2-t1) of outlet accumulative total liquid measure, guarantee that the unexpected increase of pipe outlet liquid measure can not affect the normal operation of pipe downstream facilities and equipment: the increasing degree of controlling throughput rate in large discrepancy in elevation mixed transportation of oil and gas pipeline is not more than 25%, the reduction amplitude of discharge pressure is not more than 25%.
Along with the decay of gas well output, under the state that large discrepancy in elevation gas-liquid delivery pipeline is carried in low throughput rate, in pipe, dispersed phase holdup, along with throughput rate reduces to increase, is finally understood pipeline and cannot be carried and cause gas well to be closed down, and therefore needs to increase pipeline throughput rate and maintains normal conveying.As shown in Figure 1,2 pipeline throughput directions of normal conveying are underwater well head to downstream platform, in the time that pipeline 1 need to circulate tonifying Qi, valve 2 is closed, valve 3 is opened, pipeline 1 and pipeline 2 are formed to circulation loop, and after downstream platform supercharging, gas enters as pipeline 1 tonifying Qi from pipeline 2 platform ends, maintains pipeline 1 and normally carries.
Circulation pigging mode requires spherical pig transmitterreceiver appliance to be all arranged on pipe downstream platform, when pigging, carry operating mode with circulation tonifying Qi, 2 pipelines are formed to circulation loop, realize the operation of transmitting-receiving ball at platform, the pipeline of wherein serving a ball needs forward stopping transportation, utilize platform pressurization gas to promote the reverse pigging of spherical pig, receive bulb road and can maintain normal conveying, utilize and produce fluid forward pigging.
The above-mentioned design method according to the present invention, carries out the simulation of various operating modes, can guarantee pipeline delivery safety, determines the reasonable size of upstream device facility, reduces the investment of deep water hydrocarbon field exploitation, reduces exploitation threshold, ensures the safety of oil-gas field development.
Claims (7)
1. a method for the large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee of simulation, comprises the step of (1), (2), (3), (4) and/or (5) as follows:
(1) according to the temperature conditions in large discrepancy in elevation mixed transportation of oil and gas pipeline, determine whether to inject hydrate inhibitor, to ensure the mobile safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
(2) the operation operating mode initial stage, according to the process of oil phase and water equilibrium establishment in large discrepancy in elevation mixed transportation of oil and gas pipeline, control the time that described large discrepancy in elevation mixed transportation of oil and gas pipe outlet does not have oil phase, water and hydrate inhibitor to flow out, to ensure the mobile safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline; According to the injection amount of described hydrate inhibitor, determine the storage volume of the downstream installation hydrate inhibitor being connected with described large discrepancy in elevation mixed transportation of oil and gas pipeline;
(3), during field produces, according to the situation of change of throughput rate and discharge pressure in large discrepancy in elevation mixed transportation of oil and gas pipeline, determine its impact on described large discrepancy in elevation mixed transportation of oil and gas pipe outlet parameter, to ensure the mobile safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
(4), under low throughput rate operating mode, utilize the circulation of platform circulation means to carry and supplement throughput rate, to reduce the hydrops in large discrepancy in elevation mixed transportation of oil and gas pipeline, to ensure the mobile safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
(5) control and regulate circulation cleaning canal path and circulation pigging mode, operating the impact on downstream operating mode with the pigging that reduces large discrepancy in elevation mixed transportation of oil and gas pipeline, to ensure the mobile safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline.
2. method according to claim 1, is characterized in that: the height difference of described large discrepancy in elevation mixed transportation of oil and gas pipeline is 300～1500 meters.
3. method according to claim 1 and 2, is characterized in that: in step (1), if the fluid temperature (F.T.) that described large discrepancy in elevation mixed transportation of oil and gas pipeline is carried during lower than at least 5 DEG C of the generation temperature of hydrate, need to be injected described hydrate inhibitor.
4. according to the method described in any one in claim 1-3, it is characterized in that: in step (2), controlling described large discrepancy in elevation mixed transportation of oil and gas pipe outlet does not have the delivery time of water and hydrate inhibitor to be less than 100 hours, does not have the delivery time of oil phase to be less than 60 hours.
5. according to the method described in any one in claim 1-4, it is characterized in that: in step (3), the increasing degree of controlling throughput rate in described large discrepancy in elevation mixed transportation of oil and gas pipeline is not more than 25%, and the reduction amplitude of discharge pressure is not more than 25%.
6. according to the method described in any one in claim 1-5, it is characterized in that: in step (4), described platform circulation means comprises 2 pipelines that are connected, 2 described pipelines form loop.
7. method according to claim 6, is characterized in that: in step (5), spherical pig transmitterreceiver appliance is arranged on the downstream installation that described large discrepancy in elevation mixed transportation of oil and gas pipeline is connected, and the speed of controlling spherical pig is 1～5 meter per second.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11913589B2 (en) | 2020-06-22 | 2024-02-27 | Saudi Arabian Oil Company | Pipeline water remediation based on upstream process operating parameters |
Citations (4)
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| CN2729158Y (en) * | 2004-06-03 | 2005-09-28 | 中南大学 | Ore coveying system for deep-seam mining |
| KR20100058939A (en) * | 2008-11-25 | 2010-06-04 | 한국가스공사 | Natural gas pressure regulating equipment and operating methods of it |
| CN102226499A (en) * | 2011-03-31 | 2011-10-26 | 中国海洋石油总公司 | Simulated deepwater oil-gas-water mixed transportation experimental device |
| CN103485761A (en) * | 2013-09-18 | 2014-01-01 | 西南石油大学 | Deepwater drilling riser state monitoring system and working method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2729158Y (en) * | 2004-06-03 | 2005-09-28 | 中南大学 | Ore coveying system for deep-seam mining |
| KR20100058939A (en) * | 2008-11-25 | 2010-06-04 | 한국가스공사 | Natural gas pressure regulating equipment and operating methods of it |
| CN102226499A (en) * | 2011-03-31 | 2011-10-26 | 中国海洋石油总公司 | Simulated deepwater oil-gas-water mixed transportation experimental device |
| CN103485761A (en) * | 2013-09-18 | 2014-01-01 | 西南石油大学 | Deepwater drilling riser state monitoring system and working method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11913589B2 (en) | 2020-06-22 | 2024-02-27 | Saudi Arabian Oil Company | Pipeline water remediation based on upstream process operating parameters |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: CNOOC Deepwater Development Limited Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: CNOOC Deepwater Development Limited |
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