CN112524487A - System and method for controlling accumulated liquid in large-diameter flash evaporation gas pipeline of oil field - Google Patents
System and method for controlling accumulated liquid in large-diameter flash evaporation gas pipeline of oil field Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims description 24
- 238000002347 injection Methods 0.000 claims abstract description 137
- 239000007924 injection Substances 0.000 claims abstract description 137
- 238000002156 mixing Methods 0.000 claims abstract description 94
- 230000001105 regulatory effect Effects 0.000 claims abstract description 34
- 238000009825 accumulation Methods 0.000 claims abstract description 30
- 230000001276 controlling effect Effects 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 5
- 238000010926 purge Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 21
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- 241000521257 Hydrops Species 0.000 claims description 11
- 206010030113 Oedema Diseases 0.000 claims description 11
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- 239000000203 mixture Substances 0.000 abstract description 4
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- 230000035508 accumulation Effects 0.000 description 23
- 239000004215 Carbon black (E152) Substances 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 7
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/06—Pipe-line systems for gases or vapours for steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/065—Arrangements for producing propulsion of gases or vapours
- F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/14—Arrangements for supervising or controlling working operations for eliminating water
- F17D3/145—Arrangements for supervising or controlling working operations for eliminating water in gas pipelines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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Abstract
The invention discloses a liquid accumulation control system for an oil field large-caliber flash evaporation gas pipeline, which comprises a high-temperature mixed gas conveying system, a trunk line mixing system and a matched control system; the high-temperature mixed gas conveying system is used for taking out high-temperature pressurized gas from the outlet of the compressor and reversely conveying the high-temperature pressurized gas to the main line mixing system; the main line mixing system is used for regulating the pressure of high-temperature flash evaporation gas provided by the high-temperature mixed gas conveying system and then injecting the high-temperature flash evaporation gas into a preset mixing point at the tail end of the flash evaporation gas main line so as to heat and gasify accumulated liquid at the tail end of the flash evaporation gas main line and purge the accumulated liquid; the matched control system is used for controlling the flow of the mixing gas and detecting the injection temperature of the mixing gas and the pressure of the conveying system. Based on the distribution rule and composition characteristics of accumulated liquid in the flash evaporation gas pipeline of the oil field, the invention utilizes the characteristics that a flash evaporation gas treatment plant can pressurize and provide high-temperature flash evaporation gas to be reversely injected into the flash evaporation gas pipeline, improves the temperature and the output of a medium at the tail section of the flash evaporation gas pipeline, gasifies and carries most accumulated liquid at the tail section of the flash evaporation gas pipeline to a downstream flash evaporation gas treatment plant, and thereby reduces the accumulated liquid in the pipeline.
Description
Technical Field
The invention belongs to the technical field of oilfield flash steam pipeline transportation, and particularly relates to a system and a method for controlling accumulated liquid in an oilfield large-caliber flash steam pipeline.
Background
In the operation process of an oil field central treatment plant, light components in oil products are generally removed in a high-temperature pressure reduction and stabilization mode, and the removed light components are called flash steam. In recent years, with the requirement for environmental protection and energy conservation being improved, the flash steam produced in an oil field is recovered by establishing a flash steam pipeline. The flash evaporation gas has the characteristics of low pressure, high temperature, light components and the like, and can separate out a large amount of condensate (C) at lower temperature3-C5Component(s).
For the flash evaporation gas pipeline, the flash evaporation gas pipeline generally has a larger pipe diameter due to pressure reduction and larger yield; further, due to the higher temperature of the crude oil degassing process, the flash gas pipeline is subjected to environmental influences during transportation, and more liquid accumulation may be formed in the pipeline generally. Unlike conventional gas field gathering and transportation pipelines, the accumulated liquid in the flash evaporation gas pipeline mainly contains hydrocarbon components contained in gas and separated by condensation, and the accumulated liquid in the gas field gathering and transportation pipeline mainly contains gas field water.
Excessive pipeline liquid loading can cause great influence on downstream production facilities, particularly during the processes of pipe cleaning, production improvement and the like, instantaneous excessive liquid volume enters a downstream flash steam treatment plant, on one hand, great demand is put on the size of a slug flow catcher, and on the other hand, the risk of liquid entering a gas phase pipeline can be caused. In a word, the problem that the large-caliber flash evaporation gas pipeline cannot be avoided due to the fact that the accumulated liquid is too large.
At present, for the control scheme of accumulated liquid and slug flow of the conventional gas field pipeline, active control schemes such as periodic pipe cleaning, sectional pipe cleaning, bypass pipe cleaning and the like are generally adopted, auxiliary measures such as production improvement before pipe cleaning and the like are also considered, and a slug flow catcher with huge volume is also or directly arranged. The scheme has higher requirements on construction cost or operation cost. In contrast, the flash evaporation gas recovery pipeline generally has a larger pipe diameter and stronger condensation and liquid separation trends, so that the liquid accumulation amount is far larger than that of a conventional gas field gathering and transportation pipeline, and the liquid accumulation speed is higher. Therefore, on the basis of the flash evaporation gas-liquid separation rule and the characteristics of liquid accumulation components, more economical and reasonable liquid accumulation control measures are searched, and slug flow load caused in the processes of pipe cleaning, production increasing and the like is fundamentally relieved.
Disclosure of Invention
The invention aims to: aiming at the problems, the system and the method for controlling the accumulated liquid in the large-caliber flash evaporation gas pipeline in the oil field can further improve the accumulated liquid control technology of the flash evaporation gas pipeline in the low-pressure oil field.
The main technical idea of the invention is based on the operating characteristics of the components of the flash steam and the pipeline of the flash steam in the oil field, combines the law of the liquid accumulation of the flash steam in the pipeline conveying process, fully utilizes the pressurization treatment process of a flash steam treatment plant, is provided with a high-temperature mixed gas conveying system, a main line mixing system, a matching control system and the like, when the output is too low and causes the continuous slug flow at the outlet of the flash evaporation gas pipeline, or before the operations of cleaning the pipeline and increasing the production which may cause the slug flow exceeding the receiving capacity of the downstream segment slug flow catcher, the pressurized high-temperature medium is used for providing heat input, and the heat input is reversely mixed and enters the flash evaporation gas pipeline at the last segment, by means of improving the flow rate and the flowing temperature of the end pipeline and utilizing two modes of gas phase carrying and liquid phase gasification, the hydrocarbon medium liquid accumulation amount of the end pipeline is reduced in a synergic mode, the end liquid accumulation amount of the pipeline with the characteristic of serious liquid accumulation is effectively reduced, and the effect of controlling the plug flow of the outlet section of the pipeline are achieved.
The technical scheme adopted by the invention is as follows: the utility model provides an oil field heavy-calibre flash distillation gas pipeline hydrops control system which characterized in that: the system comprises a high-temperature mixed gas conveying system, a trunk line mixing system and a matched control system;
the flash evaporation gas inlet end of the high-temperature mixed gas conveying system is connected with a pipeline at the outlet end of a compressor of a flash evaporation gas treatment plant, the flash evaporation gas outlet end of the high-temperature mixed gas conveying system is connected with a main line mixing system, and the high-temperature mixed gas conveying system is used for taking out high-temperature pressurized gas from the outlet of the compressor and reversely conveying the high-temperature pressurized gas to the main line mixing system;
the main line blending system is arranged in a flash evaporation gas main line injection point area selected by an off-plant flash evaporation gas pipeline and used for regulating the pressure of high-temperature flash evaporation gas provided by the high-temperature blended gas conveying system and then injecting the high-temperature flash evaporation gas into a preset blending point at the tail end of the flash evaporation gas main line so as to heat and gasify accumulated liquid at the tail end of the flash evaporation gas main line and purge the accumulated liquid;
the matching control system is arranged on the high-temperature blending gas conveying system and the main line blending system and used for controlling the flow of blending gas and detecting the injection temperature of the blending gas and the pressure of the conveying system.
The invention relates to an oil field large-caliber flash evaporation gas pipeline accumulated liquid control system.A main line mixing system divides an off-plant flash evaporation gas pipeline into a front-section flash evaporation gas pipeline and a rear-section flash evaporation gas pipeline at a reverse injection point of the off-plant flash evaporation gas pipeline, the front-section flash evaporation gas pipeline is connected with an upstream oil field treatment plant, the rear-section flash evaporation gas pipeline is connected with an in-plant steam pipeline through an in-plant block valve, and the front-section flash evaporation gas pipeline, the rear-section flash evaporation gas pipeline, the in-plant steam pipeline and the in-plant block valve form a flash evaporation gas main line conveying system which is used for communicating the upstream oil field treatment plant and the downstream flash evaporation gas treatment plant.
According to the accumulated liquid control system for the large-caliber flash evaporation gas pipeline of the oil field, the selected position of the reverse injection point is a position where the accumulated liquid in the pipeline is 40-50% of the total accumulated liquid in the pipeline and serves as a high-temperature mixing injection point.
The invention relates to a liquid accumulation control system for a large-caliber flash evaporation gas pipeline of an oil field, wherein a high-temperature mixed gas conveying system comprises a gas taking pipeline and a reverse conveying pipeline, a first cutoff valve of the gas taking pipeline is arranged on the gas taking pipeline, one end of the gas taking pipeline is connected with an outlet side pipeline of a compressor, the other end of the gas taking pipeline is connected with one end of the reverse conveying pipeline, and the other end of the reverse conveying pipeline is connected with a main line mixing system.
The invention relates to an oil field large-caliber flash evaporation gas pipeline accumulated liquid control system, wherein a bypass system is arranged on one side of a first cut-off valve of a gas taking pipeline of the gas taking pipeline, the system comprises a bypass pipeline, and a gas taking bypass cut-off valve and a gas taking bypass regulating valve which are arranged on the bypass pipeline, a replacement injection valve is arranged on the bypass pipeline, and a replacement exhaust valve is arranged at the tail end of a reverse conveying pipeline.
The invention relates to a liquid accumulation control system for a heavy-caliber flash evaporation gas pipeline of an oil field, wherein a main line mixing system comprises an injection pipeline, and an injection pipeline regulating valve, an injection pipeline first cut-off valve and an injection pipeline second cut-off valve which are sequentially arranged on the injection pipeline, one end of the injection pipeline is connected with a reverse conveying pipeline of a high-temperature mixed gas conveying system, and the other end of the injection pipeline is connected with a reverse injection point selected by the flash evaporation gas pipeline outside a plant.
The invention relates to an oil field large-caliber flash evaporation gas pipeline accumulated liquid control system, wherein an injection bypass is arranged on one side of an injection pipeline regulating valve and one side of a first cut-off valve of an injection pipeline, and the injection bypass comprises a bypass pipeline, and an injection bypass regulating valve and an injection bypass cut-off valve which are arranged on the bypass pipeline.
The invention relates to a liquid accumulation control system for an oil field large-caliber flash evaporation gas pipeline, wherein a matched control system comprises a pressure transmitter, a first temperature transmitter and a flow transmitter which are arranged on a reverse conveying pipeline of a high-temperature blending gas conveying system, and a second temperature transmitter which is arranged on an injection pipeline of a main line blending system, and key variable monitoring required by reverse conveying flash evaporation gas inflation pressure and blending flow control operation is provided by detecting key point temperature, pressure and flow.
A method for controlling accumulated liquid of a large-caliber flash evaporation gas pipeline in an oil field is characterized by comprising the following steps: the high-temperature medium after the pressure boost of the compressor outlet side of the flash evaporation gas treatment plant is reversely conveyed and mixed into an off-plant flash evaporation gas pipeline at the tail end of a flash evaporation gas main line, the temperature of a downstream pipeline at an injection point is increased through the injected high-temperature pressurized flash evaporation gas, and the gas flow rate in the downstream pipeline at the injection point is increased so as to gasify and carry the accumulated liquid at the tail end of the flash evaporation gas pipeline to the downstream flash evaporation gas treatment plant.
The invention relates to a method for controlling liquid accumulation of an oil field large-caliber flash evaporation gas pipeline, which specifically comprises the following steps:
the method comprises the following steps: calculating the liquid accumulation amount in each flash evaporation gas pipeline under the expected minimum conveying working condition through simulation analysis software to obtain a pipeline on-way liquid accumulation distribution rule and a pipeline on-way temperature change rule, taking the position of the pipeline with accumulated liquid accumulation of 40-50% of the total liquid accumulation of the pipeline as a high-temperature mixing injection point, setting a high-temperature mixing gas conveying system, and calculating the highest reverse injection amount according to the maximum temperature of the mixed gas not exceeding the maximum design temperature of the pipeline;
step two: when the system normally operates, the high-temperature mixed gas conveying system, the main line mixing system and the matched control system of each main line are kept closed, and the flash steam of different oil field treatment plants is conveyed to a flash steam central treatment plant through respective collecting and conveying pipelines and is received, converged, pressurized and treated;
step three: when the protected flash steam pipeline is in production reduction operation and is ready to carry out production extraction or pipe cleaning operation, firstly, a high-temperature mixed gas conveying system is started, and specifically comprises a gas taking bypass block valve and a gas taking bypass block valve after a compressor is started, mixed gas is input into the gas taking pipeline and is pressurized, and the gas taking bypass block valve are closed after the pressure is pressurized to the outlet pressure of the compressor; opening a first stop valve of the gas taking pipeline to communicate the outlet of the compressor with the gas taking pipeline;
then opening a main line mixing system, specifically comprising a first cut-off valve of the injection pipeline and a second cut-off valve of the injection pipeline, slowly opening an injection pipeline regulating valve, controlling the opening of the injection pipeline regulating valve according to a preset injection flow, wherein the time for the opening of the injection pipeline regulating valve to reach the preset opening is not more than 4 hours;
finally, the flow of the tail end of the flash evaporation gas main pipeline is the sum of the source conveying flow and the blending injection flow, the temperature of the mixed gas is greatly increased, and the volume of accumulated liquid is reduced in the main pipeline at the downstream of the blending point under the conditions of carrying of the mixed gas and heating of the mixed gas;
step four: carrying out pipeline production upgrading or pipe cleaning operation, and closing the high-temperature mixed gas conveying system and the trunk line mixing system after the pipeline production upgrading is finished; for pigging operations, the high temperature admixture gas delivery system and the trunk blending system are shut down after the pig passes the blending point, as indicated by the pig passing indicator. .
Compared with the prior art, the invention has the following positive effects: based on the distribution rule and composition characteristics of accumulated liquid in a flash gas pipeline of an oil field, the function of pressurizing and providing high-temperature flash gas in a flash gas treatment plant is fully utilized, the condition that the high-temperature flash gas with smaller pipe diameter is paved and reversely injected into the flash gas pipeline is considered, the temperature and the output of a medium at the tail section of the flash gas pipeline are improved, so that most of accumulated liquid at the tail section of the flash gas pipeline is gasified and carried to a downstream flash gas treatment plant, the accumulated liquid in the pipeline is reduced, the pipeline is controlled to be improved under low output or to be cleaned to provide lower section plug flow load, the conventional large-sized section plug flow catcher with large volume is replaced, and the technical development in the field is promoted.
The concrete expression is as follows:
(1) science of setup
The invention focuses on the characteristic that the accumulated liquid in the flash evaporation gas pipeline of the oil field is mainly condensed hydrocarbon and the accumulated liquid amount is relatively large under the low-output operation of the flash evaporation gas pipeline, and by means of the configuration of a pressurization facility in a flash evaporation gas treatment plant, a stream of high-temperature pressurization flash evaporation gas with small flow is led out and reversely conveyed and then mixed into the flash evaporation gas pipeline, the temperature of a downstream pipe section at an injection point is increased, so that the liquid phase hydrocarbon in the downstream pipe section is gasified, the gas flow speed in the downstream pipe section is increased by utilizing the increased output, the liquid carrying capacity of the gas can be increased to a certain extent, and the accumulated liquid amount in the downstream pipe.
(2) Good economical efficiency
The invention reduces the liquid accumulation of the pipeline by newly building the high-temperature flash evaporation gas reverse conveying pipeline with smaller pipe diameter, replaces a section plug flow catcher with large volume in a treatment plant, and has the advantage in construction cost. In the operation stage, the reversely conveyed flash steam is taken from the outlet of the compressor and can enter the flash steam treatment plant again after being reversely injected, so that no gas is discharged or wasted; meanwhile, the system is only started when the output is increased or the pipe is cleared at low output, the operation frequency is low, and the operation cost is low.
(3) Promote the technical progress
According to the invention, the liquid accumulation rule of the flash evaporation gas gathering and transportation pipeline is fully considered, the hydrocarbon liquid accumulation in the pipeline is gasified by increasing the medium temperature according to the idea of reversely transporting and injecting high-temperature gas into the main pipeline, the liquid accumulation volume is reduced, and the downstream-section plug flow load under the working condition of production increase or pipe cleaning is reduced. Compared with the conventional slug flow control technology, the method realizes the technical development and expands the technical means and the direction for ensuring the flow of the flash evaporation gas gathering and transportation pipeline.
Drawings
The invention will be described by way of specific embodiments and with reference to the accompanying drawings, in which
Fig. 1 is a schematic diagram of the principle of the present invention.
The labels in the figure are: the system comprises a front-section flash gas pipeline, a rear-section flash gas pipeline, a steam pipeline in a plant, a gas inlet shutoff valve, a gas-liquid separator, a compressor, a reverse injection point, a gas taking pipeline, a first shutoff valve of the gas taking pipeline, a gas taking bypass shutoff valve, a gas taking bypass regulating valve, a displacement injection valve, a reverse conveying pipeline, a displacement exhaust valve, an injection pipeline regulating valve, an injection pipeline, a first shutoff valve of the injection pipeline, a bypass regulating valve, an injection bypass shutoff valve, a pressure transmitter, a first temperature transmitter, a flow transmitter and a second temperature transmitter, wherein the 1 is a front-section flash gas pipeline, the 2 is a rear-section flash gas pipeline, the 3 is a steam pipeline in the plant, the 4 is a gas inlet shutoff valve, the 5 is a gas-liquid separator, the 6 is a compressor, the 7 is a.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1, a liquid accumulation control system for a large-caliber flash evaporation gas pipeline in an oil field comprises a high-temperature blending gas conveying system, a trunk blending system and a matching control system; the flash evaporation gas inlet end of the high-temperature blended gas conveying system is connected with the outlet end of a compressor 6 of a flash evaporation gas treatment plant through a pipeline, the flash evaporation gas outlet end of the high-temperature blended gas conveying system is connected with a main line blending system, and the high-temperature blended gas conveying system is used for taking out high-temperature pressurized gas from the outlet of the compressor 6 and reversely conveying the high-temperature pressurized gas to the main line blending system; the main line blending system is arranged in a flash gas main line injection point area selected by an off-plant flash gas pipeline and used for regulating the pressure of high-temperature flash gas provided by the high-temperature blended gas conveying system and then injecting the high-temperature flash gas into a preset blending point at the tail end of the flash gas main line so as to heat and gasify accumulated liquid at the tail end of the flash gas main line and purge the accumulated liquid, so that the accumulated liquid amount at the tail end of the flash gas main line is reduced overall, and meanwhile, a part of receiving space is provided for plug flow input by an upstream pipe section; the matching control system is arranged on the high-temperature blending gas conveying system and the main line blending system and used for controlling the flow of blending gas and detecting the injection temperature of the blending gas and the pressure of the conveying system.
Specifically, the trunk blending system divides the off-plant flash evaporation gas pipeline into a front-section flash evaporation gas pipeline 1 and a rear-section flash evaporation gas pipeline 2 at a reverse injection point 7 of the off-plant flash evaporation gas pipeline, the reverse injection point 7 is selected to be a high-temperature blending injection point at a position where accumulated liquid in the pipeline is 40% -50% of total accumulated liquid in the pipeline, wherein the front-section flash evaporation gas pipeline and the rear-section flash evaporation gas pipeline are both laid underground and are not insulated, the front-section flash evaporation gas pipeline 1 is connected with an upstream oil field treatment plant, the rear-section flash evaporation gas pipeline 2 is connected with an in-plant steam pipeline 3 through an in-plant block valve 4, the in-plant steam pipeline is laid in an exposed air mode, the pipe diameter of the in-plant steam pipeline is consistent with that of the rear-section flash evaporation gas pipeline, the functional requirements of pipeline cleaning are met, the in-plant block valve is a ball valve with an automatic block system and is used for closing, The rear-section flash evaporation gas pipeline 2, the steam pipeline 3 in the plant and the plant inlet block valve 4 form a flash evaporation gas main line conveying system which is used for communicating an upstream oil field treatment plant and a downstream flash evaporation gas treatment plant.
Specifically, the high-temperature blended gas conveying system comprises a gas taking pipeline 11 and a reverse conveying pipeline 16, wherein a first cut-off valve 12, a normally closed valve and a manual ball valve of the gas taking pipeline 11 are arranged on the gas taking pipeline 11 and used for controlling the high-temperature blended gas conveying system to be opened or closed, one end of the gas taking pipeline 11 is connected with a pipeline on the outlet side of a compressor 6, the design pressure and the material of the gas taking pipeline are consistent with those of the pipeline on the outlet of the compressor, the pipe diameter of the gas taking pipeline is determined according to the principle that the gas flow rate in the pipeline is not more than 15m/s and is used for providing high-temperature (the initial temperature is about 150 ℃) main line injection gas, the other end of the gas taking pipeline 11 is connected with one end of the reverse conveying pipeline 16, the other end of the reverse conveying pipeline 16 is connected with the main line blending system, the reverse conveying pipeline comprises an exposed section and a buried, preferably, the heat preservation layer is adopted for thermal maintenance so as to reduce the reverse conveying amount of flash evaporation gas.
The bypass system is arranged on one side of the first cut-off valve 12 of the gas taking pipeline 11 and comprises a bypass pipeline, a gas taking bypass cut-off valve 13 and a gas taking bypass regulating valve 14, wherein the gas taking bypass cut-off valve is a manual ball valve, is normally closed, has a pipe diameter of DN50, is used for avoiding high pressure from directly acting on the gas taking bypass regulating valve during normal operation, and is opened in advance before the high-temperature blended gas conveying system is started, and then the gas taking bypass regulating valve is started; the gas taking bypass regulating valve 14 is a manual regulating valve which is normally closed and has the pipe diameter of DN50, is opened after the gas taking bypass cut-off valve is opened, controls the flow volume of flash steam, and is used for injecting the flash steam into the downstream reverse conveying pipeline to establish back pressure so as to smoothly open the first cut-off valve of the gas taking pipeline. A replacement injection valve 15, a normally closed manual ball valve, is arranged on the bypass pipeline and is used for injecting replacement gas to replace gas in the reverse conveying pipeline before the high-temperature mixed gas conveying system is started, and a replacement exhaust valve 17 is arranged at the tail end of the reverse conveying pipeline 16 and is used for providing a discharge channel of a replaced medium during replacement operation.
Specifically, the main line blending system is used for injecting high-temperature flash steam after pressure regulation into a flash steam main line through a reverse conveying pipeline, and specifically comprises an injection pipeline 21, and an injection pipeline regulating valve 22, an injection pipeline first cut-off valve 23 and an injection pipeline second cut-off valve 26 which are sequentially arranged on the injection pipeline 21, wherein one end of the injection pipeline 21 is connected with the reverse conveying pipeline 16 of the high-temperature blending gas conveying system, and the other end of the injection pipeline 21 is connected with a reverse injection point 7 selected by the flash steam pipeline outside the plant. The injection pipeline is laid in the open air and is insulated, the injection pipeline adjusting valve is preferably an electric control valve and is used for adjusting pressure and flow, regulating flash steam delivered by the reverse delivery pipeline to the pressure of an injection point, controlling the injection flow, ensuring that the temperature of the flash steam in the main pipeline after mixing does not exceed the maximum design temperature of the main pipeline, and the first cut-off valve of the injection pipeline is a manual ball valve and is opened before the injection pipeline adjusting valve is opened.
Wherein, an injection bypass is arranged at one side of the injection pipeline regulating valve 22 and the injection pipeline first cut-off valve 23 of the injection pipeline 21 and is used for forming a standby with an injection main line valve formed by the injection pipeline regulating valve 22 and the injection pipeline first cut-off valve 23, the maintainability and the reliability of the blending system are ensured, the injection bypass can be simultaneously opened when the flash gas main line medium reaches the injection point and the temperature is too low, the injection amount of the high-temperature medium is increased and the medium temperature after the main line is blended is increased, the injection bypass comprises a bypass pipeline, an injection bypass regulating valve 24 and an injection bypass cut-off valve 25 which are arranged on the bypass pipeline, the configuration and the function of the injection bypass regulating valve and the injection bypass cut-off valve are respectively consistent with the injection pipeline regulating valve and the injection pipeline first cut-off valve, a second cut-off valve of the injection pipeline is arranged at the position of, normally closed, used for communicating or blocking the main blending system and the main conveying system.
Specifically, the matched control system comprises a pressure transmitter 31, a first temperature transmitter 32 and a flow transmitter 33 which are arranged on the reverse conveying pipeline 16 of the high-temperature blending gas conveying system, and a second temperature transmitter 34 which is arranged on the injection pipeline 21 of the trunk blending system, so that key variable monitoring required by reverse conveying flash steam charging pressure and blending flow control operation is provided through detection of key point temperature, pressure and flow.
Wherein, the pressure transmitter 31 is arranged at the tail end of the reverse conveying pipeline 16, has the functions of signal local display and remote transmission, and is used for indicating the pipeline pressurization condition in the early stage of reverse mixing and providing the pipeline flowing pressure indication in the reverse injection stage; the first temperature transmitter 32 is arranged at the tail end of the reverse conveying pipeline 16, has the functions of on-site signal display and remote transmission, and is used for indicating the temperature of the flash steam before being conveyed to the vicinity of an injection point in the reverse direction and pressure regulation; the flow transmitter 33 is arranged at the tail end of the reverse conveying pipeline 16, has the functions of on-site signal display and remote transmission and is used for indicating the injection amount of flash evaporation gas; the second temperature transmitter 34 is arranged in the trunk blending system, has the functions of signal local display and remote transmission, is used for indicating the temperature of the flash steam after being reversely conveyed to an injection point for pressure regulation, and is directly used for representing the temperature of a high-temperature medium before injection.
Therefore, the accumulated liquid control system of the large-caliber flash evaporation gas pipeline in the oil field is formed, and better guarantee and solution can be provided for the safe operation and accumulated liquid control of the flash evaporation gas pipeline in the oil field.
The working principle of the invention is as follows:
(1) the operating pressure of the oil field flash evaporation gas pipeline is lower, generally below 1MPa.g, the pipe diameter is usually larger, and the pipe transmission medium has higher dew point. In the flowing process, the temperature of the medium is gradually reduced due to heat exchange of a buried environment, hydrocarbon liquid is separated out, and accumulated liquid is formed in the pipeline. Further, the accumulated liquid increases along with the increase of the temperature reduction amplitude, and a special rule that the second half-section accumulated liquid amount is far larger than the first half-section accumulated liquid amount is presented in the pipeline. Such liquid accumulations are relatively temperature sensitive, and the separated hydrocarbon liquid can be regasified when the temperature of the medium is increased. For the accumulated liquid amount, the accumulated liquid of the pipeline under the normal output is smaller than that under the condition of flow reduction, which is mainly that the medium temperature drop along the way under the working condition of small flow is larger, the liquid carrying capacity of the gaseous medium is poorer, and the accumulated liquid of the pipeline is easier under the coupling action.
(2) For the flash evaporation gas pipeline with longer conveying distance, the volume of the pipeline is larger, and the volume of accumulated liquid is larger under the working condition of small expected conveying capacity; during rapid production lifting or pipe cleaning, a slug flow with an incredible volume can be caused to instantaneously appear at the outlet of the pipeline. Although acceptable by the provision of large slug flow traps, the advantages of land occupation, investment and frequency of use are not present. Therefore, the high-temperature flash steam reverse injection function of the system is provided.
(3) When the pipeline runs at a low output and is ready for rapid production extraction or pipe cleaning, a high-temperature blending gas conveying system takes out part of high-temperature flash evaporation gas (the outlet temperature is about 150 ℃) from a primary compressor, and the high-temperature flash evaporation gas is conveyed to a set injection point without pressure regulation and heat preservation and can provide an injection source of about 140-145 ℃ (considering the temperature drop of 5-10 ℃); comparing the pre-calculated temperature after pressure regulation with the main line flash gas temperature before the injection point, predicting and calculating the mixing proportion (reverse injection gas volume and main line flash gas volume), meeting the requirement of the main line maximum operation temperature, and controlling the opening of the pressure regulating valve according to the mixture proportion to finish mixing; the flash distillation gas temperature after the mixture obviously rises to hydrops heats and promotes defeated volume in the pipeline section of injection point low reaches, arouses hydrops gasification, and promotes gaseous liquid carrying capacity, reduces the hydrops volume in the injection point low reaches pipeline by a wide margin, realizes that the hydrops volume is high-efficient to be cut down, provides the advantage for pipeline is put forward production or is managed for the qing dynasty: (1) the total volume and liquid volume of the pipeline are greatly reduced, and even if the pipeline is quickly cleaned, the amount of the slug pushed out from the tail end of the pipeline is small, so that the receiving load of the downstream slug catcher is met; (2) after the accumulated liquid in the pipeline at the downstream of the injection point is interfered by the injected gas, a larger gas phase volume is reserved, the buffer effect on the slug flow flowing from the upstream of the injection point can be realized, and the slug flow load at the tail end of the pipeline is further indirectly reduced.
In addition, the invention also provides a method for controlling the accumulated liquid in the large-caliber flash evaporation gas pipeline of the oil field, which comprises the following steps: the high-temperature medium after the pressure boost of the compressor outlet side of the flash evaporation gas treatment plant is reversely conveyed and mixed into an off-plant flash evaporation gas pipeline at the tail end of a flash evaporation gas main line, the temperature of a downstream pipeline at an injection point is increased through the injected high-temperature pressurized flash evaporation gas, and the gas flow rate in the downstream pipeline at the injection point is increased so as to gasify and carry the accumulated liquid at the tail end of the flash evaporation gas pipeline to the downstream flash evaporation gas treatment plant.
The method specifically comprises the following steps:
the method comprises the following steps: calculating the amount of accumulated liquid in each flash evaporation gas pipeline under the expected minimum conveying working condition through simulation analysis software, acquiring a distribution rule of accumulated liquid along the pipeline and a temperature change rule along the pipeline, selecting the pipeline with the obviously large amount of accumulated liquid to control the accumulated liquid, so as to reduce the size of a plug flow catcher in the downstream section, taking the position of the accumulated liquid of the pipeline of 40-50% of the total accumulated liquid of the pipeline as an optimal high-temperature mixing injection point, setting a high-temperature mixing gas conveying system, and calculating the highest reverse injection amount by using the highest temperature of the mixed gas not exceeding the highest design temperature of the pipeline;
step two: when the system normally operates, the high-temperature mixed gas conveying system, the main line mixing system and the matched control system of each main line are kept closed, and the flash steam of different oil field treatment plants is conveyed to a flash steam central treatment plant through respective collecting and conveying pipelines and is received, converged, pressurized and treated;
step three: when the protected flash steam pipeline is in production reduction operation and is ready to carry out production extraction or pipe cleaning operation, firstly, a high-temperature mixed gas conveying system is started, and specifically comprises a gas taking bypass block valve and a gas taking bypass block valve after a compressor is started, mixed gas is input into the gas taking pipeline and is pressurized, and the gas taking bypass block valve are closed after the pressure is pressurized to the outlet pressure of the compressor; opening a first stop valve of the gas taking pipeline to communicate the outlet of the compressor with the gas taking pipeline;
then, opening a main mixing system, specifically comprising a first cut-off valve of the injection pipeline and a second cut-off valve of the injection pipeline, slowly opening an adjusting valve of the injection pipeline, controlling the opening of the adjusting valve of the injection pipeline according to the preset injection flow, wherein the time when the opening of the adjusting valve of the injection pipeline reaches the preset opening is not more than 4 hours so as to avoid the instantaneous rapid increase of the mixed gas and push the accumulated liquid at the downstream of the mixing point out of the pipeline;
finally, the flow of the tail end of the flash evaporation gas main pipeline is the sum of the source conveying flow and the blending injection flow, the temperature of the mixed gas is greatly increased, and the volume of accumulated liquid is reduced in the main pipeline at the downstream of the blending point under the conditions of carrying of the mixed gas and heating of the mixed gas;
step four: carrying out pipeline production upgrading or pipe cleaning operation, and closing the high-temperature mixed gas conveying system and the trunk line mixing system after the pipeline production upgrading is finished; for pigging operations, the high temperature admixture gas delivery system and the trunk blending system are shut down after the pig passes the blending point, as indicated by the pig passing indicator.
The invention is not limited to the specific embodiments described above, but extends to any novel feature or any novel combination of features disclosed herein, or to any novel method or process steps, or any novel combination of steps, which are disclosed.
Claims (10)
1. The utility model provides an oil field heavy-calibre flash distillation gas pipeline hydrops control system which characterized in that: the system comprises a high-temperature mixed gas conveying system, a trunk line mixing system and a matched control system;
the flash evaporation gas inlet end of the high-temperature blended gas conveying system is connected with the outlet end of a compressor (6) of a flash evaporation gas treatment plant through a pipeline, the flash evaporation gas outlet end of the high-temperature blended gas conveying system is connected with a main line blending system, and the high-temperature blended gas conveying system is used for taking out high-temperature pressurized gas from the outlet of the compressor (6) and reversely conveying the high-temperature pressurized gas to the main line blending system;
the main line blending system is arranged in a flash evaporation gas main line injection point area selected by an off-plant flash evaporation gas pipeline and used for regulating the pressure of high-temperature flash evaporation gas provided by the high-temperature blended gas conveying system and then injecting the high-temperature flash evaporation gas into a preset blending point at the tail end of the flash evaporation gas main line so as to heat and gasify accumulated liquid at the tail end of the flash evaporation gas main line and purge the accumulated liquid;
the matching control system is arranged on the high-temperature blending gas conveying system and the main line blending system and used for controlling the flow of blending gas and detecting the injection temperature of the blending gas and the pressure of the conveying system.
2. The oil field heavy-calibre flash distillation gas pipeline hydrops control system of claim 1, characterized in that: the main line blending system divides an off-plant flash evaporation gas pipeline into a front-section flash evaporation gas pipeline (1) and a rear-section flash evaporation gas pipeline (2) at a reverse injection point (7) of the off-plant flash evaporation gas pipeline, the front-section flash evaporation gas pipeline (1) is connected with an upstream oil field treatment plant, the rear-section flash evaporation gas pipeline (2) is connected with an in-plant steam pipeline (3) through an in-plant block valve (4), and the front-section flash evaporation gas pipeline (1), the rear-section flash evaporation gas pipeline (2), the in-plant steam pipeline (3) and the in-plant block valve (4) form a flash evaporation gas main line conveying system which is used for communicating the upstream oil field treatment plant and the downstream flash evaporation gas treatment plant.
3. The oil field heavy-calibre flash distillation gas pipeline hydrops control system of claim 2, characterized in that: the selected position of the reverse injection point (7) is a position where accumulated liquid in the pipeline is 40-50% of the total liquid in the pipeline and serves as a high-temperature mixing injection point.
4. The oil field heavy-calibre flash distillation gas pipeline hydrops control system of claim 1, characterized in that: the high-temperature mixed gas conveying system comprises a gas taking pipeline (11) and a reverse conveying pipeline (16), wherein a first cutoff valve (12) of the gas taking pipeline is arranged on the gas taking pipeline (11), one end of the gas taking pipeline (11) is connected with an outlet side pipeline of a compressor (6), the other end of the gas taking pipeline (11) is connected with one end of the reverse conveying pipeline (16), and the other end of the reverse conveying pipeline (16) is connected with a main line mixing system.
5. The oilfield large-caliber flash gas pipeline liquid accumulation control system according to claim 4, wherein: a bypass system is arranged on one side of a first cut-off valve (12) of the gas taking pipeline (11), the bypass system comprises a bypass pipeline, a gas taking bypass cut-off valve (13) and a gas taking bypass regulating valve (14) which are arranged on the bypass pipeline, a replacement injection valve (15) is arranged on the bypass pipeline, and a replacement exhaust valve (17) is arranged at the tail end of the reverse conveying pipeline (16).
6. The oil field heavy-calibre flash distillation gas pipeline hydrops control system of claim 1, characterized in that: the main line blending system comprises an injection pipeline (21), and an injection pipeline regulating valve (22), an injection pipeline first cut-off valve (23) and an injection pipeline second cut-off valve (26) which are sequentially arranged on the injection pipeline (21), wherein one end of the injection pipeline (21) is connected with a reverse conveying pipeline (16) of the high-temperature blending gas conveying system, and the other end of the injection pipeline (21) is connected with a reverse injection point (7) selected by a flash evaporation gas pipeline outside the plant.
7. The oilfield large-caliber flash gas pipeline liquid accumulation control system according to claim 6, wherein: and an injection bypass is arranged on one side of the injection pipeline regulating valve (22) and the injection pipeline first cut-off valve (23) of the injection pipeline (21), and comprises a bypass pipeline, and an injection bypass regulating valve (24) and an injection bypass cut-off valve (25) which are arranged on the bypass pipeline.
8. The oil field heavy-calibre flash distillation gas pipeline hydrops control system of claim 1, characterized in that: the matched control system comprises a pressure transmitter (31), a first temperature transmitter (32) and a flow transmitter (33) which are arranged on a reverse conveying pipeline (16) of the high-temperature blending gas conveying system, and a second temperature transmitter (34) which is arranged on an injection pipeline (21) of the trunk blending system, and key variable monitoring required by reverse conveying flash evaporation gas inflation pressure and blending flow control operation is provided through detection of key point temperature, pressure and flow.
9. A method for controlling accumulated liquid of a large-caliber flash evaporation gas pipeline in an oil field is characterized by comprising the following steps: the high-temperature medium after the pressure boost of the compressor outlet side of the flash evaporation gas treatment plant is reversely conveyed and mixed into an off-plant flash evaporation gas pipeline at the tail end of a flash evaporation gas main line, the temperature of a downstream pipeline at an injection point is increased through the injected high-temperature pressurized flash evaporation gas, and the gas flow rate in the downstream pipeline at the injection point is increased so as to gasify and carry the accumulated liquid at the tail end of the flash evaporation gas pipeline to the downstream flash evaporation gas treatment plant.
10. The method for controlling the accumulated liquid in the large-caliber flash gas pipeline of the oil field according to claim 9, wherein the method comprises the following steps: the method specifically comprises the following steps:
the method comprises the following steps: calculating the liquid accumulation amount in each flash evaporation gas pipeline under the expected minimum conveying working condition through simulation analysis software to obtain a pipeline on-way liquid accumulation distribution rule and a pipeline on-way temperature change rule, taking the position of the pipeline with accumulated liquid accumulation of 40-50% of the total liquid accumulation of the pipeline as a high-temperature mixing injection point, setting a high-temperature mixing gas conveying system, and calculating the highest reverse injection amount according to the maximum temperature of the mixed gas not exceeding the maximum design temperature of the pipeline;
step two: when the system normally operates, the high-temperature mixed gas conveying system, the main line mixing system and the matched control system of each main line are kept closed, and the flash steam of different oil field treatment plants is conveyed to a flash steam central treatment plant through respective collecting and conveying pipelines and is received, converged, pressurized and treated;
step three: when the protected flash steam pipeline is in production reduction operation and is ready to carry out production extraction or pipe cleaning operation, firstly, a high-temperature mixed gas conveying system is started, and specifically comprises a gas taking bypass block valve and a gas taking bypass block valve after a compressor is started, mixed gas is input into the gas taking pipeline and is pressurized, and the gas taking bypass block valve are closed after the pressure is pressurized to the outlet pressure of the compressor; opening a first stop valve of the gas taking pipeline to communicate the outlet of the compressor with the gas taking pipeline;
then opening a main line mixing system, specifically comprising a first cut-off valve of the injection pipeline and a second cut-off valve of the injection pipeline, slowly opening an injection pipeline regulating valve, controlling the opening of the injection pipeline regulating valve according to a preset injection flow, wherein the time for the opening of the injection pipeline regulating valve to reach the preset opening is not more than 4 hours;
finally, the flow of the tail end of the flash evaporation gas main pipeline is the sum of the source conveying flow and the blending injection flow, the temperature of the mixed gas is greatly increased, and the volume of accumulated liquid is reduced in the main pipeline at the downstream of the blending point under the conditions of carrying of the mixed gas and heating of the mixed gas;
step four: carrying out pipeline production upgrading or pipe cleaning operation, and closing the high-temperature mixed gas conveying system and the trunk line mixing system after the pipeline production upgrading is finished; for pigging operations, the high temperature admixture gas delivery system and the trunk blending system are shut down after the pig passes the blending point, as indicated by the pig passing indicator.
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| WO2023024328A1 (en) * | 2021-08-24 | 2023-03-02 | 青岛新奥能源有限公司 | Secondary steam pressurization system |
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