CN103867900B - A kind of method simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee - Google Patents
A kind of method simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee Download PDFInfo
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- CN103867900B CN103867900B CN201410091599.4A CN201410091599A CN103867900B CN 103867900 B CN103867900 B CN 103867900B CN 201410091599 A CN201410091599 A CN 201410091599A CN 103867900 B CN103867900 B CN 103867900B
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Abstract
The invention discloses a kind of method simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee.Comprise the step of following (1), (2), (3), (4) and/or (5): (1), according to the temperature conditions in large discrepancy in elevation mixed transportation of oil and gas pipeline, determines whether to inject hydrate inhibitor; (2) at the operation operating mode initial stage, according to the process of oil phase and aqueous phase equilibrium establishment in mixed transportation of oil and gas pipeline, the time that mixed transportation of oil and gas pipe outlet does not have oil phase, aqueous phase and hydrate inhibitor to flow out is controlled; (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, its impact on multiphase pipeline outlet parameter is determined; (4), under Low flow rate operating mode, utilize platform loop device to circulate and carry supplementary throughput rate; (5) control and regulate circulation cleaning canal path and circulation pigging mode.This method can reduce the dynamic change of large discrepancy in elevation mixed transportation of oil and gas pipeline to the impact of upstream device facility, optimizes pipe downstream equipment scale, reduces investment.
Description
Technical field
The present invention relates to a kind of method simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee.
Background technique
In Marine oil and gas resource exploitation, Cemented filling is the defeated major way of offshore oil and gas water transport, and therefore submarine pipeline is the important component part of marine engineering facility, and the flowing safety guarantee design of submarine pipeline affect the key factor that Marine oil and gas resource develops.
The exploitation in deep water gas field, due to the impact of the depth of water and distance, the flowing 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, must solve the problem that there will not be in some shallow sea piping design processes in the design process.
3-1 gas field, Li Gulf is the deep water gas field being positioned at South China Sea, and depth of water 1450m is the deep water gas field of Late Cambrian 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 underwater well head is produced by 3-1 gas field, Li Gulf deep water natural gas line 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, flowing velocity and distribution can be subject to the impact of the factors such as pipeline elevation parameter in the duct for they, flow, the pressure and other parameters of pipeline exit can change by formative dynamics, thus 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, need the flowing safety guarantee design method of seeking a kind of system to reduce the defeated risk of pipe, ensure the exploitation of petroleum resources, be very important.
Summary of the invention
The object of this invention is to provide a kind of method 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 flowing safety guarantee design of deepwater offshore fields.
A kind of method simulating large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee provided by the present invention, comprises the step of following (1), (2), (3), (4) and/or (5):
(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 aqueous phase equilibrium establishment in large discrepancy in elevation mixed transportation of oil and gas pipeline, the time that described large discrepancy in elevation mixed transportation of oil and gas pipe outlet does not have oil phase, aqueous phase and hydrate inhibitor to flow out is determined; According to the injection amount of described hydrate inhibitor, determine the storage volume of the downstream installation hydrate inhibitor be 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, its impact on described large discrepancy in elevation mixed transportation of oil and gas pipe outlet parameter is determined;
(4), under Low flow rate operating mode, utilize platform loop device to circulate and carry supplementary throughput rate, to reduce the hydrops in large discrepancy in elevation mixed transportation of oil and gas pipeline;
(5) circulation cleaning canal path and circulation pigging mode is determined, to reduce the pigging operations of large discrepancy in elevation mixed transportation of oil and gas pipeline to the impact of downstream operating mode.
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 during the generation temperature at least 5 DEG C of the fluid temperature (F.T.) of described large discrepancy in elevation mixed transportation of oil and gas Cemented filling lower than hydrate, need to inject 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 aqueous phase 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), described large discrepancy in elevation mixed transportation of oil and gas pipe outlet according to determining does not have the delivery time of aqueous phase and oil phase (representing with T), and the injection amount (representing with Q) of the described hydrate inhibitor determined, 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 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 loop device comprises 2 pipelines be connected, and 2 described pipelines form loop.
In above-mentioned method, in step (5), spherical pig transmitterreceiver appliance is arranged on downstream installation that described large discrepancy in elevation mixed transportation of oil and gas pipeline is connected, and the speed controlling spherical pig is 1 ~ 5 meter per second.
In method of the present invention, the downstream installation be connected with described large discrepancy in elevation mixed transportation of oil and gas pipeline can be offshore platform, land terminal or floats executes process units.
The present invention has the following advantages:
1, the method for flowing safety guarantee provided by the invention, system can comprehensively plan the flowing 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, can the area of Optimization Platform while reducing submarine pipeline conveying risk, improve the impact of submarine pipeline on upstream device, improve submarine pipeline operational reliability.The design's method repeatedly for the design of submarine pipeline flowing safety guarantee, has ensured the exploitation in multiple middle deep water gas field.The present invention can be widely used in the flowing 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, this method can reduce the dynamic change of large discrepancy in elevation mixed transportation of oil and gas pipeline to the impact of upstream device facility, optimizes pipe downstream equipment scale, reduces investment;
4, the present invention can be applicable to the related fields such as terrestrial pipeline, has a extensive future.
Accompanying drawing explanation
Fig. 1 utilizes in the inventive method schematic diagram when circulating pigging.
Embodiment
The method used in following embodiment if no special instructions, is conventional method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
Pipeline OLGA simulation model is set up 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, if manage defeated temperature to generate temperature 5 DEG C lower than hydrate under the defeated pressure condition of pipe, then needing to inject hydrate inhibitor prevents hydrate from generating blocking pipe, and add a certain amount of hydrate inhibitor in a model, reduce Hydrate Formation Conditions, guarantee that under the defeated pressure condition of pipe, manage defeated temperature generates temperature 5 DEG C higher than hydrate.
Because large discrepancy in elevation gas-liquid delivery pipeline is when starting, after in pipeline, liquid phase reaches certain cumulant, pipe outlet just has liquid and flows out, and hydrate inhibitor major part all exists in aqueous phase, therefore need the time that the pipe outlet oil phase of simulation pipeline start operating performance, aqueous phase and hydrate inhibitor arrive.First the original state before pipeline startup is set up, namely the gas of certain pressure is full of in pipeline, then the oil gas water making oil gas field produce enters gassiness pipeline, the process of oil phase and aqueous phase equilibrium establishment in simulation pipeline start operating performance pipeline, determine the time (T) that pipe outlet oil phase and aqueous phase flow out: controlling described pipe outlet does not have the delivery time of aqueous phase 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, and determines 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, change relevant parameter in a model, the change of simulation throughput rate and pressure change operating mode pipe outlet fluid flow, and design pipe downstream slug catcher size according to the changing value (Q2-Q1) and transformation period (t2-t1) exporting accumulative 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 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 at Low flow rate, in pipe, dispersed phase holdup reduces to increase along with throughput rate, finally can cannot carry and causes gas well to be closed down by pipeline, therefore need to increase pipeline throughput rate to maintain normal conveying.As shown in Figure 1, normal conveying 2 Cemented filling directions are underwater well head to downstream platform, when pipeline 1 needs circulation tonifying Qi, valve 2 is closed, valve 3 is opened, pipeline 1 and pipeline 2 are formed circulation loop, and after downstream platform supercharging, gas enters as pipeline 1 tonifying Qi from pipeline 2 platform end, maintains pipeline 1 and normally carries.
Circulation pigging mode requires that spherical pig transmitterreceiver appliance is all arranged on pipe downstream platform, with circulation tonifying Qi conveying operating mode during pigging, 2 pipelines are formed circulation loop, the operation of transmitting-receiving ball is realized at platform, 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 design method above-mentioned according to the present invention, carries out the simulation of various operating mode, can guarantee Cemented filling 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 (1)
1. simulate a method for large discrepancy in elevation mixed transportation of oil and gas Flows safety guarantee, comprise the step of following (1), (2), (3), (4) and/or (5):
(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 flowing safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
The height difference of described large discrepancy in elevation mixed transportation of oil and gas pipeline is 300 ~ 1500 meters;
If during the generation temperature at least 5 DEG C of the fluid temperature (F.T.) of described large discrepancy in elevation mixed transportation of oil and gas Cemented filling lower than hydrate, need to inject described hydrate inhibitor;
(2) the operation operating mode initial stage, according to the process of oil phase and aqueous phase 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, aqueous phase and hydrate inhibitor to flow out, to ensure the flowing 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 be connected with described large discrepancy in elevation mixed transportation of oil and gas pipeline;
Controlling described large discrepancy in elevation mixed transportation of oil and gas pipe outlet does not have the delivery time of aqueous phase and hydrate inhibitor to be less than 100 hours, does not have the delivery time of oil phase to be less than 60 hours;
(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 flowing safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
The increasing degree 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%;
(4), under Low flow rate operating mode, utilize platform loop device to circulate and carry supplementary throughput rate, to reduce the hydrops in large discrepancy in elevation mixed transportation of oil and gas pipeline, to ensure the flowing safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
Described platform loop device comprises 2 pipelines be connected, and 2 described pipelines form loop;
(5) control and regulate circulation cleaning canal path and circulation pigging mode, to reduce the pigging operations of large discrepancy in elevation mixed transportation of oil and gas pipeline to the impact of downstream operating mode, to ensure the flowing safety of described large discrepancy in elevation mixed transportation of oil and gas pipeline;
Spherical pig transmitterreceiver appliance is arranged on downstream installation that described large discrepancy in elevation mixed transportation of oil and gas pipeline is connected, and the speed controlling spherical pig is 1 ~ 5 meter per second.
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| 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 |
| 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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| KR101048332B1 (en) * | 2008-11-25 | 2011-07-15 | 한국가스공사 | Natural gas constant pressure equipment and its operation method |
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| 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 |
| 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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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 |