CN117072138A - Unmanned treatment system and treatment method for removing acid gas in oil field - Google Patents
Unmanned treatment system and treatment method for removing acid gas in oil field Download PDFInfo
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- CN117072138A CN117072138A CN202310998492.7A CN202310998492A CN117072138A CN 117072138 A CN117072138 A CN 117072138A CN 202310998492 A CN202310998492 A CN 202310998492A CN 117072138 A CN117072138 A CN 117072138A
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- 230000007797 corrosion Effects 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000003129 oil well Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 84
- 239000013535 sea water Substances 0.000 claims description 80
- 230000005540 biological transmission Effects 0.000 claims description 47
- 230000001105 regulatory effect Effects 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 25
- 239000003814 drug Substances 0.000 claims description 23
- 230000005764 inhibitory process Effects 0.000 claims description 17
- 238000010992 reflux Methods 0.000 claims description 16
- 239000003112 inhibitor Substances 0.000 claims description 13
- 239000008139 complexing agent Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229940079593 drug Drugs 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
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- 239000003921 oil Substances 0.000 description 67
- 238000004519 manufacturing process Methods 0.000 description 17
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/36—Underwater separating arrangements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
- E21B47/047—Liquid level
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
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Abstract
The invention relates to an unmanned treatment system and a treatment method for removing acid gas in an oil field, wherein the system comprises an oil gas gathering and transportation treatment unit; the oil gas gathering and transportation treatment unit comprises an oil nozzle, a multi-way valve and a separator which are sequentially connected in series, wherein the separator is respectively connected with an external transportation pump and a torch liquid separating tank through pipelines, the external transportation pump is connected with a submarine pipeline, the torch liquid separating tank is connected with a torch through a gas pipeline, and the oil nozzle is connected with the outlet of an oil well logistics pipeline. The oil gas gathering and transportation processing unit carries out gas-liquid separation on the oilfield produced liquid, removes acid gas in the oilfield produced liquid, avoids corrosion risks of acid medium in the oilfield produced liquid on pipelines and equipment of a submarine pipeline and a downstream center platform, reduces the frequency of corrosion prevention operation and maintenance of unmanned platform pipeline equipment and submarine pipelines, such as corrosion hanging piece detection and sea pipe through ball, reduces the operation of offshore platform personnel on a system on site, reduces labor cost, and improves the reliability of oilfield acid gas treatment.
Description
Technical Field
The invention relates to the technical field of offshore oilfield development and research, in particular to an unmanned treatment system and a treatment method for removing acid gas in an oilfield.
Background
The on-site operation workload of offshore oilfield production is large, and the oil gas gathering, well reversing metering, depressurization and degassing, pressurization and external transportation, medicament injection, sea pipe preheating and replacement and the like all need multiple ginseng, control and support, so that the safety, the high efficiency and the stability of oilfield production are ensured. However, offshore oilfield developers have high operation cost and heavy living and material transportation tasks, and the on-site operation of the personnel is greatly influenced by typhoons, cold waves and other extreme weather, so that the operation of few persons or even no persons is an important direction of lowering the cost of offshore oilfield development.
The oil field development treatment system is determined by the oil gas property, and associated gas is high in CO content 2 、H 2 S, the offshore oil field is required to be separated and deaerated and pressurized for export so as to reduce corrosion of the acid medium to the submarine pipeline and avoid production safety and environmental risk caused by premature consumption of the submarine pipeline and corrosion allowance.
In the prior art, a separator, an external pump, a flare head, an ignition device, a chemical agent tank and an injection pump are required to be configured in a system for removing the acid gas in the oil field, the process is complex, the equipment operation and the agent filling workload are large, and the system is limited by the requirements of the liquid level of the separator, the process pressure, the operation of the moving equipment, the stability of the flare combustion and the requirement of the chemical agent supplementation, and the personnel participation degree in the treatment process is high, so that the labor cost is high.
Disclosure of Invention
Aiming at one or more of the problems, the invention aims to provide an unmanned treatment system and a treatment method for removing acid gas in an oil field, which reduce the operation of offshore platform personnel on the system on site, reduce the labor cost, improve the reliability of acid gas treatment in the field and realize unmanned operation of the offshore platform on site of the treatment system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an unmanned treatment system for removing acid gas from an oilfield, comprising:
the oil gas gathering and transportation treatment unit comprises a choke, a multi-way valve and a separator which are sequentially connected in series, wherein the separator is respectively connected with an external transportation pump and a torch liquid separation tank, the external transportation pump is connected with a submarine pipeline, the torch liquid separation tank is connected with a torch, and the choke is connected with an oil well logistics pipeline;
wherein, the multiway valve, the separator, the external pump and the torch liquid separating tank are remotely controlled by external equipment.
Preferably, the method further comprises:
the medicament injection unit comprises an umbilical cable, wherein the umbilical cable comprises a plurality of medicament injection pipelines, and the medicament injection pipelines are respectively connected with the pipeline at the oil nozzle, the pipeline between the multi-way valve and the separator and the pipeline at the outlet of the seawater submerged pump; the umbilical cord is connected to an external agent supply device.
Preferably, the method further comprises:
the sea pipe preheating and replacing unit comprises a sea water submerged pump, wherein the sea water submerged pump is respectively connected with the input ends of the multi-way valve and the output pump through pipelines; a first sea pipe replacement switch valve is arranged on the pipeline of the seawater submerged pump and the multi-way valve; the pipeline between the seawater submerged pump and the input end of the external conveying pump is provided with a second seawater tube replacement switch valve, the second seawater tube replacement switch valve is connected with a seawater tube preheating heater in parallel, and two ends of the seawater tube preheating heater are respectively provided with a seawater tube preheating switch valve.
Preferably, a first emergency shut-off valve is arranged on a pipeline between the multi-way valve and the separator.
Preferably, a separator pressure regulating valve is arranged on a pipeline between the separator and the flare liquid separating tank.
Preferably, the separator is provided with a remote pressure monitoring sensor, and the pressure monitoring sensor is connected with the separator pressure regulating valve through a cable.
Preferably, the separator is connected with a remote liquid level monitoring sensor, and an output pump frequency converter is connected between the remote liquid level monitoring sensor and the output pump through a cable; the output end of the outer transmission pump is connected with the separator through a pipeline, an outer transmission pump reflux regulating valve is arranged on the pipeline, and the outer transmission pump reflux regulating valve is connected with the remote transmission liquid level monitoring sensor through a cable.
Preferably, a corrosion inhibitor control valve is arranged on the drug injection pipeline connected with the pipeline at the oil nozzle in the umbilical cable; a demulsifier control valve is arranged on the drug injection pipeline connected with the pipeline between the multi-way valve and the separator in the umbilical cable; and a sea pipe corrosion inhibition complexing agent control valve is arranged on the chemical injection pipeline connected with the pipeline at the outlet of the sea water submerged pump in the umbilical cable.
A process for flash removal of oilfield sour gas based on the unmanned treatment system for removal of oilfield sour gas described in any of the foregoing, comprising the steps of:
collecting produced liquid of an oil field on an offshore platform, and then sequentially introducing the collected produced liquid into a separator through a choke and a multi-way valve, wherein the separator flashes hydrocarbon and acid gas and liquid by reducing pressure;
the generated gas is conveyed to a torch liquid separating tank for washing, and the washed gas enters a torch for burning and discharging;
the liquid produced is transported via an export pump into a subsea pipeline.
Preferably, in the step of introducing the produced liquid of the oil field into the separator through the oil nozzle and the multi-way valve after being gathered on the offshore platform, the corrosion inhibitor and the demulsifier are respectively injected into the pipeline at the oil nozzle and at the input end of the separator through the drug injection pipeline in the umbilical cable.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. according to the unmanned treatment system for removing the acid gas in the oil field, the oil gas gathering and transportation treatment unit carries out gas-liquid separation on the oil field produced liquid, so that the acid gas in the oil field produced liquid is removed, corrosion risks of acid mediums in the oil field produced liquid on pipelines and equipment of a submarine pipeline and a downstream center platform are avoided, corrosion operation and maintenance frequency of unmanned platform pipeline equipment and the submarine pipeline, such as corrosion hanging piece detection and sea pipe through ball, operation of offshore platform personnel on the system on site is reduced, labor cost is reduced, and reliability of field acid gas treatment is improved.
2. According to the unmanned treatment system for removing the acid gas in the oil field, provided by the invention, the liquid level stability of the separator is automatically ensured through the frequency converter of the external transmission pump and the reflux regulating valve of the external transmission pump, the flow pressure stability is automatically ensured through the pressure regulating valve of the separator, and the stability of unmanned platform liquid separation treatment is ensured.
3. The unmanned treatment system for removing the acid gas in the oil field, provided by the invention, comprises a multi-way valve, an automatically started external transmission pump, a seawater submerged pump, a plasma torch, an umbilical cable, an emergency shut-off valve/a switch valve/a regulating valve, can be remotely controlled to operate, automatically realizes ignition after the torch is extinguished, and liquid level and pressure regulation of a separator, so that the field workload of personnel on moving equipment, valves, medicament supplement, torch ignition and the like in the oil field development process is reduced to the greatest extent, and the labor cost of the oil field development is reduced.
4. According to the treatment method for removing the acid gas in the oil field, the acid gas is separated through the separator and is combusted and discharged through the torch, so that the corrosion risk of the acid medium on pipelines and equipment of a submarine pipeline and a downstream center platform is reduced.
Drawings
FIG. 1 is a schematic diagram of the connection structure of an unmanned treatment system for removing acid gas in an oil field according to an embodiment of the present invention.
FIG. 2 is a flow chart of the steps of a treatment process for removing acid gas from an oilfield provided in this embodiment of the invention.
The reference numerals in the drawings:
1 is an oil nozzle, 2 is a multi-way valve, 3 is a separator, 4 is an external pump, 5 is a torch liquid separating tank, 6 is a torch, 7 is a seawater submergence pump, 8 is a first sea pipe replacement switch valve, 9 is a second sea pipe replacement switch valve, 10 is a sea pipe preheating heater, 11 is a sea pipe preheating switch valve, 12 is an umbilical cable, 13 is a multiphase flowmeter, 14 is a first emergency shut-off valve, 15 is a separator pressure regulating valve, 16 is a remote pressure monitoring sensor, 17 is a remote liquid level monitoring sensor, 18 is an external pump frequency converter, 19 is an external pump reflux regulating valve, 20 is a corrosion inhibitor control valve, 21 is a demulsifier control valve, 22 is a sea pipe corrosion inhibition complexing agent control valve, 23 is a second emergency shut-off valve, and 24 is a third emergency shut-off valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, where arrows represent flow directions of liquid or gas, the directions or positional relationships indicated by terms such as "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the system or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
According to the unmanned treatment system and the unmanned treatment method for removing the acid gas in the oil field, provided by the invention, through the remotely controllable multi-way valve, the external transmission pump, the seawater submerged pump, the umbilical cable, the switching valve and the automatic control torch, personnel operation on the offshore platform site is reduced, personnel safety of offshore oil field development is ensured, labor cost is reduced, reliability of acid gas treatment in the oil field is improved, and unmanned operation on the offshore platform site of the treatment system is realized.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the unmanned treatment system for removing acid gas in oil field provided in this embodiment includes an oil gas gathering and transportation treatment unit;
the oil gas gathering and transportation treatment unit comprises an oil nozzle 1, a multi-way valve 2 and a separator 3 which are sequentially connected in series, wherein the separator 3 is respectively connected with an external transportation pump 4 and a torch liquid separating tank 5 through pipelines, the external transportation pump 4 is connected with a submarine pipeline, the torch liquid separating tank 5 is connected with a torch 6 through a gas pipeline, and the oil nozzle 1 is connected with the outlet of an oil well logistics pipeline; wherein, the multiway valve 2, the separator 3, the output pump 4 and the torch liquid separating tank 5 are remotely controlled by external equipment.
In the specific application, the oil gas gathering and transportation processing unit has the functions of realizing unmanned processing of oil gas gathering and transportation, low-pressure separation and degassing, associated gas torch discharge and liquid pressurization and transportation; the inside of the multi-way valve 2 is provided with a plurality of inlets and outlets, and the inlets and the outlets can be respectively connected with different pipelines, for example, the oil nozzle 1 and the seawater submerged pump 7 are connected with different inlets of the multi-way valve 2 through respective pipelines; the multi-way valve 2 is a valve capable of being controlled remotely; separator 3 is a low pressure separator that flashes off CO at an operating pressure of 200kPaA 2 、H 2 S and other acid gases, the separated acid gases enter a flare liquid separating tank 5 for washing, and the washed gases enter a flare 6 for burning and discharging, so that corrosion to downstream facilities is slowed down; the torch 6 is a plasma torch and is matched with a flame monitoring instrument, and the torch 6 can be automatically controlled to be opened and closed; the external device is a remote controller.
According to the unmanned treatment system for removing the acid gas in the oil field, the multi-way valve 2, the separator 3, the external transmission pump 4 and the liquid separating tank 5 can be remotely controlled through the remote controller, personnel are not required to operate on the offshore platform site, and unmanned treatment for removing the acid gas in the oil field on the offshore platform site can be realized.
In this embodiment, the treatment system further comprises a sea pipe preheat displacement unit and a chemical injection unit;
the sea pipe preheating displacement unit comprises a sea water submerged pump 7, and the sea water submerged pump 7 is connected with the input end of the external transmission pump 4 through a pipeline and a multi-way valve 2 respectively; the pipeline of the seawater submerged pump 7 and the multi-way valve 2 is provided with a first seawater pipe replacement switch valve 8; a second sea pipe replacement switch valve 9 is arranged on a pipeline between the sea water submerged pump 7 and the input end of the external transmission pump 4, the second sea pipe replacement switch valve 9 is connected in parallel with a sea pipe preheating heater 10, and sea pipe preheating switch valves 11 are respectively arranged at two ends of the sea pipe preheating heater 10;
the medicament injection unit comprises an umbilical cable 12, wherein the umbilical cable 12 comprises a plurality of medicament injection pipelines which are respectively connected with a pipeline at the position of the oil nozzle 1, a pipeline between the multi-way valve 2 and the separator 3 and a pipeline at the position of the outlet of the seawater submerged pump 7; the umbilical cord 12 is connected to an external drug supply device.
In specific application, the submarine pipeline preheating and replacing unit has the functions of realizing the field operation of submarine pipeline preheating in the production stage of an oil field and the remote operation of submarine pipeline replacement in the emergency production stopping stage of the oil field, ensuring that the submarine pipeline has high enough temperature in the production stage, evacuating crude oil in the production stopping stage, and avoiding the risk of tube condensation of the submarine pipeline; in the sea pipe preheating and replacing unit, sea water is lifted to the height of an ocean platform by utilizing a sea water submerged pump 7, the 600kPa operating pressure of a lower deck is maintained, the sea water enters a sea pipe preheating heater 10 to heat the sea water to 60 ℃, the sea pipe preheating requirement is met, the sea water is pressurized to 1500kPa by an external transmission pump 4 to preheat a submarine pipeline, and finally the sea water is reinjected into a stratum or discharged after being treated by a water treatment system of a downstream central treatment platform through the submarine pipeline.
The function of the medicament injection unit is to inject corrosion inhibitor, demulsifier and sea pipe corrosion inhibition complexing agent into the pipeline at the oil nozzle 1 of the oil gas gathering and transportation treatment unit and the outlet of the sea water submerged pump 7 of the sea pipe preheating and replacement unit respectively, so as to improve demulsification efficiency of oilfield produced liquid treatment and relieve corrosion of oilfield produced liquid and sea water to facilities on the upper part of the block and submarine pipelines in the production stage and the sea pipe preheating and replacement stage; the umbilical cable 12 is connected with a downstream central processing platform, the downstream central processing platform is a medicament supply device, and a plurality of medicament injection pipelines in the umbilical cable 12 are respectively connected with the positions of the oil nozzle 1 of the oil gas gathering and conveying processing unit, the outlets of the seawater submerged pump 7 of the pipeline and the seawater pipe preheating and replacing unit.
In this embodiment, a multiphase flowmeter 13 is provided between the multiway valve 2 and the separator 3.
In a specific application, oilfield produced fluid is converged and distributed in a multi-way valve 2 through a choke 1, and the multi-way valve 2 periodically introduces produced fluid of a production well into a multi-phase flowmeter 13 for metering.
In this embodiment, a first emergency shut-off valve 14 is provided in the line between the multiplex valve 2 and the separator 3.
In a specific application, when the separator 3 and subsequent components fail, the pipeline can be closed by the first emergency shut-off valve 14 to prevent the produced liquid from flowing into the separator 3; after the fault is treated, the first emergency shut-off valve 14 is opened again, and the treatment of the subsequent produced liquid is resumed.
In this embodiment, a second emergency shut-off valve 23 is provided in the line between the separator 3 and the output pump 4, and a third emergency shut-off valve 24 is provided in the line at the output of the infusion pump, with the corresponding line being shut off in an emergency.
In this embodiment, a separator pressure regulating valve 15 is provided in the line between the separator 3 and the flare tank 5.
In a specific application, the pressure of the gas entering the flare liquid separation tank 5 is regulated by regulating the pressure regulating valve 15 of the separator.
In this embodiment, the separator 3 is provided with a remote pressure monitoring sensor 16, and the pressure monitoring sensor 16 is connected to the separator pressure regulating valve 15 by a cable.
In a specific application, the remote pressure monitoring sensor 16 can monitor the gas pressure in the separator 3, and the separator pressure regulating valve 15 regulates the size of a valve switch according to the gas pressure condition in the separator 3 monitored by the remote pressure monitoring sensor 16, so as to maintain stable output of the gas pressure; the gas separated by the separator 3 enters the flare liquid separating tank 5 through the separator pressure regulating valve 15, is scrubbed by the flare liquid separating tank 5 and enters the flare 6 for burning and discharging.
In the embodiment, the separator 3 is connected with a remote liquid level monitoring sensor 17, and an output pump frequency converter 18 is connected between the remote liquid level monitoring sensor 17 and the output pump 4 through a cable; the output end of the output pump 4 is connected with the separator 3 through a pipeline, an output pump reflux regulating valve 19 is arranged on the pipeline, and the output pump reflux regulating valve 19 is connected with the remote liquid level monitoring sensor 17 through a cable.
In a specific application, after the separator 3 builds up pressure and liquid level, the separated liquid enters the output pump 4 to be pressurized to a set output pressure, for example, up to about 2600kPaA; meanwhile, the remote liquid level monitoring sensor 17, the external transmission pump frequency converter 18 and the external transmission pump reflux regulating valve 19 are started, the remote liquid level monitoring sensor 17 monitors the liquid level of the separator 3 in real time and automatically adjusts the frequency of the external transmission pump frequency converter 18 and the opening of the external transmission pump reflux regulating valve 19, so that the liquid level in the separator 3 is maintained to be stable.
In the embodiment, a corrosion inhibitor control valve 20 is arranged on a drug injection pipeline connected with a pipeline at the position of the oil nozzle 1 in the umbilical cable 12; a demulsifier control valve 21 is arranged on a drug injection pipeline connected with a pipeline between the multi-way valve 2 and the separator 3 in the umbilical cable 12; the chemical injection pipeline connected with the pipeline at the outlet of the seawater submerged pump 7 in the umbilical cable 12 is provided with a seawater pipe corrosion inhibition complexing agent control valve 22.
In the specific application, the umbilical cable 12 is controlled to inject corresponding medicaments into the oil gas gathering and transportation processing unit and the sea pipe preheating and replacing unit through the corrosion inhibitor control valve 20, the demulsifier control valve 21 and the sea pipe corrosion inhibition complexing agent control valve 22.
In this embodiment, the devices and valves in the system including the multiway valve 2, the separator 3, the output pump 4, the seawater submerged pump 7, the first emergency shut-off valve 14, the second emergency shut-off valve 23, the third emergency shut-off valve 24, the first sea pipe replacement switch valve 8, the second sea pipe replacement switch valve 9, the separator pressure regulating valve, the output pump reflux regulating valve 19, and the like, may be connected with a remote controller disposed in a central control room through cables, and the operations of the respective valves and devices may be controlled through the remote controller. Therefore, the treatment of unmanned removal of the acid gas in the oil field on the offshore platform can be realized.
According to the unmanned treatment system for removing the acid gas in the oil field, the life support ship is configured on the platform in the production stage of the oil field to realize the standing, the preheating working condition of the submarine pipeline can be realized through the operation of field personnel, the seawater is pressurized and heated, and then the seawater enters the submarine pipeline, so that the temperature of the submarine pipeline is increased. The seawater submerged pump 7, the seawater pipe preheating heater 10 and the external transmission pump 4 are started on site, the seawater pipe preheating switch valve 11 and the third emergency shutoff valve 24 of the submarine pipeline inlet are opened, the seawater pipe corrosion inhibition composite agent control valve 22 is opened, and the seawater is injected with the seawater pipe corrosion inhibition composite agent through the umbilical cable 12. The seawater is lifted to a platform by utilizing a seawater submerged pump 7, the operation pressure of 600kPa on a lower deck is maintained, the seawater enters a seawater pipe preheating heater 10 to heat the seawater to 60 ℃, the seawater meets the seawater pipe preheating requirement, the seawater is pressurized to 1500kPa by an external transmission pump 4 to preheat a submarine pipeline, and the seawater is reinjected into a stratum or discharged after being treated by a water treatment system of a downstream central treatment platform.
The offshore platform is unattended in the oilfield production stage, remote operations such as oil gas gathering and transportation, gas-liquid separation, torch discharge, pressurization and external transportation, medicament injection and the like are needed, all equipment and valves are controlled by remote controllers, and the valves of the field equipment are controlled by instrument control cables. The first emergency shut-off valve 14, the second emergency shut-off valve 23, the third emergency shut-off valve 24, the multi-way valve 2 and the multiphase flowmeter 13 are remotely opened, and after the liquid level and the pressure of the separator 3 are established, the outer conveying pump 4, the outer conveying pump frequency converter 18, the outer conveying pump return flow regulating valve 19, the separator pressure regulating valve 15 and the torch 6 are remotely opened to communicate with the oil gas gathering and conveying treatment flow.
The oilfield produced liquid is converged and distributed in a multi-way valve 2 through a choke 1, the multi-way valve 2 periodically introduces the produced liquid of a production well into a multi-phase flowmeter 13 for metering, the produced liquid enters a separator 3 for low-pressure separation, and CO is flashed off under the operating pressure of 200kPa 2 、H 2 S and other acid gases, and slowing down corrosion to downstream facilities; after the pressure and the liquid level of the separator 3 are established, the separated liquid enters the external transmission pump 4 to be pressurized to the external transmission pressure of about 2600kP at the highest, meanwhile, a remote transmission liquid level monitoring sensor 17, an external transmission pump frequency converter 18 and an external transmission pump reflux regulating valve 19 are started, the liquid level of the separator 3 is monitored in real time, the frequency of the external transmission pump frequency converter 18 and the opening degree of the external transmission pump reflux regulating valve 19 are automatically regulated, the liquid level of the separator 3 is maintained to be stable, and separated gas enters a torch liquid separating tank 5 through a separator pressure regulating valve 15 and enters a torch 6 for combustion discharge after washing gas; meanwhile, the umbilical cable 12 is started, the corrosion inhibitor control valve 20 and the demulsifier control valve 21 are opened, and the corrosion inhibitor and the demulsifier are injected into the pipeline at the oil nozzle and the pipeline at the input end of the separator 3, so that the high efficiency and the stability of the oil and gas gathering and transportation treatment process are ensured.
The platform is unattended in the emergency shutdown stage of the oil field, and crude oil replacement in the pipeline on the upper part of the platform and the submarine pipeline needs to be remotely completed as soon as possible, so that the submarine pipeline is ensured to have no risk of pipe condensation in the production stopping process of the oil field. Firstly, all the equipment multi-way valve 2, the multiphase flowmeter 13, the external transmission pump 4, the first emergency shut-off valve, the second emergency shut-off valve and the third emergency shut-off valve in the oil gas gathering and transmission processing unit under the emergency shut-off working condition are shut off and opened; then, remotely starting the seawater submerged pump 7 and the output pump 4, and opening the first sea pipe replacement switch valve 8, the second sea pipe replacement switch valve 9 and the first, second and third emergency shut-off valves; simultaneously, the sea pipe corrosion inhibition complexing agent control valve 22 is opened, and sea water is injected with the sea pipe corrosion inhibition complexing agent through the umbilical cable 12. The seawater is lifted to a platform through a seawater submerged pump 12, the operation pressure of a lower deck of 600kPa is maintained, the seawater is mixed with a seawater pipe corrosion inhibition complexing agent from an umbilical cable, the seawater is introduced into a multi-way valve 2 through a first seawater pipe replacement switching valve 8, crude oil in a pipeline on the upper part of the platform is replaced into a separator 3, and then the crude oil is pressurized to the external transmission pressure by an external transmission pump 4, wherein the maximum is 2600kPa, and the crude oil is transmitted to a downstream central processing platform; after the replacement of the pipeline on the upper part of the platform is finished, the first sea pipe replacement switch valve 8 is closed, the second sea pipe replacement switch valve 9 is kept open, the seawater is directly introduced into the external transmission pump 4 to be pressurized and then is conveyed to the downstream central processing platform, and the seawater enters the water treatment system of the central processing platform to be treated and then is reinjected into the stratum or discharged.
Example 2
Referring to fig. 2, the treatment method for removing acid gas in oil field provided in this embodiment is implemented based on the unmanned treatment system for removing acid gas in oil field in embodiment 1, and includes the following steps:
s01, collecting produced liquid of an oil field on an offshore platform, sequentially introducing the collected produced liquid into a separator 3 through a choke 1 and a multi-way valve 2, and flashing hydrocarbon and acid gas and liquid out of the separator 3 by reducing pressure;
s02, conveying the generated gas to a torch liquid separating tank 5 for washing, and enabling the washed gas to enter a torch 6 for burning and discharging;
and S03, conveying the generated liquid into the submarine pipeline through the external conveying pump 4.
The submarine pipeline is connected with the central processing platform to intensively process the liquid into qualified crude oil.
The multi-way valve 2, the separator 3, the external transmission pump 4 and the torch liquid separating tank 5 can be controlled remotely, personnel are not required to operate on the offshore platform site, and the unmanned removal of oilfield acid gas treatment on the offshore platform site can be realized.
In this embodiment, separator 3 flashes off hydrocarbons and acid gases including CO by reducing the pressure 2 、H 2 S, when CO is contained by utilizing the torch 6 2 When the flame is extinguished due to overlarge wind speed or too low heat value of the associated gas in a short period, the flame can be found out immediately through a matched flame monitoring instrument, and the flame can be ignited immediately through the flame 6, so that the stability of the flame emission of the flame is ensured, the tempering risk is avoided, and the production safety is ensured.
In this embodiment, in the step of flashing out hydrocarbon and acid gas and liquid by the separator 3 by reducing the pressure, after the pressure and the liquid level of the separator 3 are established, the separated liquid enters the external transmission pump 4 to be pressurized to the external transmission pressure of at most about 2600kP, and meanwhile, the remote transmission liquid level monitoring sensor 17, the external transmission pump frequency converter 18 and the external transmission pump reflux regulating valve 19 are started, so that the liquid level of the separator 3 is monitored in real time, the frequency of the external transmission pump frequency converter 18 and the opening degree of the external transmission pump reflux regulating valve 19 are automatically regulated, the liquid level of the separator 3 is maintained to be stable, the separated gas enters the flare liquid separating tank 5 through the separator pressure regulating valve 15, and the washing gas enters the flare 6 to be burned and discharged.
In this embodiment, in the step of introducing the produced fluid of the oil field into the separator 3 through the nipple 1 and the multi-way valve 2 after being collected on the offshore platform, the corrosion inhibitor and the demulsifier are injected into the pipeline at the nipple 1 and the input end of the separator 3 through the injection pipeline in the umbilical 12, respectively.
In the unmanned treatment system for removing acid gas in oil field of this embodiment, in the production stage of oil field, the operator starts the seawater submerged pump 7, the seawater pipe preheating heater 10 and the external pump 4, opens the seawater pipe preheating switch valve 11 and the third emergency shut-off valve 24 at the inlet of the submarine pipeline, opens the preheating flow of the submarine pipeline, and simultaneously opens the seawater pipe corrosion inhibition composite agent control valve 22, and injects the seawater pipe corrosion inhibition composite agent into the seawater through the umbilical cable 12.
In the embodiment, in the oilfield production stage, a first emergency shut-off valve 14 is remotely opened, a multi-way valve 2 and a multiphase flowmeter 13 are started, an external transmission pump 4, an external transmission pump frequency converter 18 and an external transmission pump reflux regulating valve 19 are started after the liquid level and the pressure of a separator 3 are established, and an oil gas gathering, well reversing metering, gas-liquid separation, pressurization and external transmission, torch combustion discharge and other oilfield production operations are realized in an unmanned manner.
In the embodiment, in the emergency shutdown stage of the oil field, the seawater submerged pump 7 and the external transmission pump 4 are remotely started, the first sea pipe replacement switch valve 8, the second sea pipe replacement switch valve 9, the first emergency shutdown valve 14, the second emergency shutdown valve 23 and the third emergency shutdown valve 24 are opened, the pipe corrosion inhibition complexing agent control valve 22 is opened, the sea pipe corrosion inhibition complexing agent is injected into the seawater through the umbilical cable 12, and the replacement of the submarine pipeline is realized in an unmanned manner.
In this embodiment, chemical agents are introduced from a downstream central processing platform through an umbilical 12, and controlled by a corrosion inhibitor control valve 20, a demulsifier control valve 21 and a sea pipe corrosion inhibition compound agent control valve 22, and corrosion inhibitors, demulsifiers and sea pipe corrosion inhibition compound agents are injected into an oil gas gathering and transportation processing unit and a sea pipe preheating and replacing unit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An unmanned treatment system for removing acid gas from an oilfield, comprising:
the oil gas gathering and transportation treatment unit comprises a choke, a multi-way valve and a separator which are sequentially connected in series, wherein the separator is respectively connected with an external transportation pump and a torch liquid separation tank, the external transportation pump is connected with a submarine pipeline, the torch liquid separation tank is connected with a torch, and the choke is connected with an oil well logistics pipeline;
wherein, the multiway valve, the separator, the external pump and the torch liquid separating tank are remotely controlled by external equipment.
2. The unmanned treatment system for removing acid gas from an oilfield of claim 1, further comprising:
the medicament injection unit comprises an umbilical cable, wherein the umbilical cable comprises a plurality of medicament injection pipelines, and the medicament injection pipelines are respectively connected with the pipeline at the oil nozzle, the pipeline between the multi-way valve and the separator and the pipeline at the outlet of the seawater submerged pump; the umbilical cord is connected to an external agent supply device.
3. The unmanned treatment system for removing acid gas from an oilfield of claim 2, further comprising:
the sea pipe preheating and replacing unit comprises a sea water submerged pump, wherein the sea water submerged pump is respectively connected with the input ends of the multi-way valve and the output pump through pipelines; a first sea pipe replacement switch valve is arranged on the pipeline of the seawater submerged pump and the multi-way valve; the pipeline between the seawater submerged pump and the input end of the external conveying pump is provided with a second seawater tube replacement switch valve, the second seawater tube replacement switch valve is connected with a seawater tube preheating heater in parallel, and two ends of the seawater tube preheating heater are respectively provided with a seawater tube preheating switch valve.
4. The unmanned treatment system for removing acid gas from an oil field of claim 1, wherein a first emergency shut-off valve is provided on the line between the multiplex valve and the separator.
5. The unmanned treatment system for removing acid gas from an oil field of claim 1, wherein a separator pressure regulating valve is provided in the line between the separator and the flare knock-out tank.
6. The unmanned treatment system for removing acid gas from an oil field of claim 5, wherein the separator is provided with a remote pressure monitoring sensor, and the pressure monitoring sensor is connected with the pressure regulating valve of the separator through a cable.
7. The unmanned treatment system for removing acid gas from an oil field according to claim 1, wherein the separator is connected with a remote liquid level monitoring sensor, and an external pump frequency converter is connected between the remote liquid level monitoring sensor and the external pump through a cable; the output end of the outer transmission pump is connected with the separator through a pipeline, an outer transmission pump reflux regulating valve is arranged on the pipeline, and the outer transmission pump reflux regulating valve is connected with the remote transmission liquid level monitoring sensor through a cable.
8. The unmanned treatment system for removing acid gas from an oilfield of claim 2, wherein the umbilical is provided with a corrosion inhibitor control valve on the injection line connected to the pipe at the nipple; the umbilical cordIn a cable with the said The medicine injection pipeline connected between the multi-way valve and the separator is provided with a demulsifier control valveThe method comprises the steps of carrying out a first treatment on the surface of the And a sea pipe corrosion inhibition complexing agent control valve is arranged on the chemical injection pipeline connected with the pipeline at the outlet of the sea water submerged pump in the umbilical cable.
9. A process for flash removal of oilfield acid gases based on an unmanned treatment system for removal of oilfield acid gases as defined in any one of claims 1 to 8, comprising the steps of:
collecting produced liquid of an oil field on an offshore platform, and then sequentially introducing the collected produced liquid into a separator through a choke and a multi-way valve, wherein the separator flashes hydrocarbon and acid gas and liquid by reducing pressure;
the generated gas is conveyed to a torch liquid separating tank for washing, and the washed gas enters a torch for burning and discharging;
the liquid produced is transported via an export pump into a subsea pipeline.
10. The method for flash evaporation removal of acid gas in oil field according to claim 9, wherein in the step of introducing the produced liquid of oil field into the separator through the oil nozzle and the multi-way valve after being collected on the offshore platform, the corrosion inhibitor and the demulsifier are respectively injected into the pipeline at the oil nozzle and the input end of the separator through the drug injection pipeline in the umbilical cable.
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| CN202310998492.7A CN117072138A (en) | 2023-08-09 | 2023-08-09 | Unmanned treatment system and treatment method for removing acid gas in oil field |
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| CN202310998492.7A CN117072138A (en) | 2023-08-09 | 2023-08-09 | Unmanned treatment system and treatment method for removing acid gas in oil field |
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