CN209468386U - A kind of processing system of novel reduction condensate gas hydrocarbon, water dew point - Google Patents
A kind of processing system of novel reduction condensate gas hydrocarbon, water dew point Download PDFInfo
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- CN209468386U CN209468386U CN201821818818.4U CN201821818818U CN209468386U CN 209468386 U CN209468386 U CN 209468386U CN 201821818818 U CN201821818818 U CN 201821818818U CN 209468386 U CN209468386 U CN 209468386U
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Abstract
The utility model discloses a kind of novel reduction condensate gas hydrocarbon, the processing system of water dew point, it include methanol tank, more station heat exchanger and dew point separator, wherein methanol tank flows out pipeline by methanol and is connected with methanol dispenser pump, methanol injects pipeline connection methanol dispenser pump and pre- cold air admission line, pre- cold air admission line is connected to more station heat exchanger, more station heat exchanger passes through pre- cold air outlet line, admission line and pre- hot gas admission line are connected with dew point separator after throttling, more station heat exchanger is connected by external transport pipeline with system defeated outside natural gas, dew point separator flows out pipeline by NGL and is connected with lime set processing system, dew point separator is connected by blow-down pipe and emptying header with blowdown system.The utility model has the advantages that principle is understandable, short flow saves land occupation, reduces investment outlay, facilitate management, meet the production requirement of gas condensate field pre-production phase, while having evaded investment risk.
Description
Technical field
The utility model relates to a kind of processing system, in particular to a kind of processing of novel reduction condensate gas hydrocarbon, water dew point
System.
Background technique
At present, gas condensate reservoir is a kind of important special oil and gas pools type between oil reservoir and natural gas pool.It is opening
During hair, strata pressure is constantly reduced, and phase-state change can occur for heavy hydrocarbon in gas phase, and condensate is precipitated in the earth formation, forms gas
Liquid two-phase.Gas condensate reservoir while producing natural gas and condensate, economic value is very high but exploitation is very complicated, and it is gentle that there is condensates
The phase-state change and retrograde condensation phenomenon of body will cause very big condensate Stratum Loss amount.
The pilot production phase of gas condensate reservoir is longer, and usually up to 3-5, floor-treating device is in the base fully realized to gas reservoir
It is begun setting up on plinth.Early stage pre-production phase natural gas carries out emptying burning mostly, this not only causes the waste of resource, but also
More containing lighter hydrocarbons, heavy hydrocarbon component in gas component, bulk gas burning and exhausting can aggravate the greenhouse effect of weather into atmosphere
It answers, has seriously affected environment.
Currently, the output object of domestic gas condensate field pre-production phase recycles after carrying out simply and easy treat mostly.Pilot production early period
Pilot production well is less and lower (the < 10000 × 10 of tolerance4m3/ d) when, output object is usually subjected to simple gas-liquid separation, liquid phase into
Row roping recovery processing, gas phase pass through the roping export trade of CNG tank car.Pilot production later period, well number increase, and tolerance increases, and only compress by CNG
Recycling has been unsatisfactory for production requirement, need to establish simple Ground Processing System and handle output object, and natural gas is made to meet pipe
The transport condition of gas transmission, i.e., other than removing wherein entrained solid impurity and free fluid, it is necessary to which removing is conveying
Under the conditions of can condense into the gas phase water and natural gas liquid hydrocarbon (NGL) component of liquid.
The water dew point of natural gas refers to that the first temperature when dripping, gas water dew point is precipitated in gas under a certain pressure
Height, moisture content is inevitable high, and when temperature reduction or pressure increase, liquid phase water can be precipitated in natural gas, in pipeline and equipment
Hydrops increases pressure drop, or even will cause slug flow, and liquid water can also be generated with some gas components in natural gas and is hydrated
Object can block valve, pipeline and equipment when serious, influence the tight gas supply of gas pipeline and the normal operation of process units.It
The hydrocarbon dew point of right gas refers to temperature when the first drop liquid hydrocarbon is precipitated in gas under a certain pressure, when the temperature of natural gas is lower than one
After hydrocarbon dew point under constant-pressure, the heavier hydro carbons in natural gas will be precipitated to form liquid phase, and the presence of these liquid phase components will be right
Pipeline, gas utilization generate different degrees of adverse effect.
China's national standard has made relevant regulations, GB 17280-2012 " natural gas " regulation to commodity gas hydrocarbon, water dew point
Are as follows: under the conditions of the pressure and temperature of natural gas interface point, water dew point should be 5 DEG C lower than the minimum environment temperature under transport condition,
Liquid hydrocarbon should be not present in natural gas；Rule of the GB 50251-2015 " code for design of gas transmission pipeline engineering " to natural gas hydrocarbons dew point
Be set to: the gas hydrocarbon dew point into gas pipeline should be lower than minimum environment temperature.
Gas dehydration, the purpose is to reduce the corrosion of gas pipeline for de- hydrocarbon, while improving the gas transmission ability of pipeline, prevent ring
Border temperature change causes that free water and hydrocarbon are precipitated in pipeline.The de- hydrocarbon of dehydration, which refers in removing natural gas, will affect it in transport condition
The part gas phase water and NGL component of lower proper flow.This be meet gas transmission requirement dehydration take off hydrocarbon be commonly referred to as it is " shallow
It is de- ".In condensate gas pre-production phase, meet conveying requirements for gas quality frequently with " shallow de- ".To the condensation day for containing more NGL component
For right gas, effectively can remove wherein water and the method for hydrocarbon simultaneously is temperature drop method.The genealogy of law, will by the temperature of reduction natural gas
It is contained therein to will affect part gas phase water that natural gas normally conveys under the conditions of pipe is defeated and NGL component is condensed and isolated
Come, takes off hydrocarbon method to meet a kind of dehydration that outer gas transmission water dew point and hydrocarbon dew point require.Temperature drop method can be divided into throttling expansion refrigeration
Cooling and external refrigeration cooling two types.The former will lose the pressure energy of natural gas itself；Although the latter will not lose pressure
Can, but natural gas refrigeration needs to consume electric power.
Conventional throttling expansion refrigeration equipment has J-T valve, supersonic speed separator (3S) and expanding machine, and wherein J-T valve is in oil gas
Be widely used on field natural pressure can for natural gas " shallow de- " equipment for utilizing, J-T valve system isenthalpic throttling cooling system, because
This refrigerating efficiency is low, and temperature drop is small under the conditions of uniform pressure drop, and it is general to be dehydrated de- hydrocarbon effect；Cryogen conventionally used for external refrigeration
Mainly there are two kinds of ammonia (NH4) and propane (N3H4), ammonia is the cryogen of most economic value, but needs water cooling, propane unit mass
Refrigerating capacity it is lower than ammonia, can be used air-cooled, but ground flow is relative complex, and the gas condensate field gas well for being not suitable for pre-production phase is raw
It produces.
Triethylene glycol depoint depression can reach 30-40 DEG C, and molecular sieve dehydration mode can make that treated, and gas water dew point reaches-
35 DEG C hereinafter, but there is a high investment, the defects of operation and maintenance cost is larger and energy consumption is high, and natural gas hydrocarbons are revealed
Point is unable to control；Throttling expansion refrigeration cold partition method has for both the above dewatering type once invests low, operation
The advantage that maintenance cost saves can also meet the control requirement of hydrocarbon dew point, but such dewatering type needs while controlling water dew point
There is sufficient pressure energy can use.
Summary of the invention
Purpose of the utility model is to solve gas condensate fields in early stage pre-production phase construction natural gas processing system
The larger problem of input cost and the processing system of a kind of novel reduction condensate gas hydrocarbon, water dew point provided.
Novel reduction condensate gas hydrocarbon provided by the utility model, water dew point processing system include methanol tank, more stand
Heat exchanger and dew point separator, wherein methanol tank flows out pipeline by methanol and is connected with methanol dispenser pump, and methanol injects pipeline
Methanol dispenser pump and pre- cold air admission line are connected, pre- cold air admission line is connected to more station heat exchanger, and more station heat exchanger passes through
Admission line and pre- hot gas admission line are connected with dew point separator after pre- cold air outlet line, throttling, and more station heat exchanger is logical
It crosses external transport pipeline to be connected with system defeated outside natural gas, dew point separator flows out pipeline by NGL and is connected with lime set processing system
Logical, dew point separator is connected by blow-down pipe and emptying header with blowdown system.
Pre- cold air outlet line is equipped with throttle valve, and throttle valve front-end and back-end are designed with gate valve.
NGL flows out pipeline and is equipped with lime set control valve.
Blow-down pipe is connected with emptying header by safety valve.
Working principle of the utility model is:
Using the pressure energy of natural gas itself, heat is exchanged with outer gas transmission by heat exchanger of more standing, natural gas is pre-chilled
The throttle valve more stood on the pre- cold air outlet line of heat exchanger is opened in processing, is carried out throttling refrigeration to natural gas, is reduced natural temperature
Degree is to -5 DEG C, and natural gas is delivered to dew point separator after cooling, and cryogenic separation recycles the NGL component in natural gas, dew point separation
Device gas outlet pipeline is connected to more station heat exchanger and pre- cold air carries out heat exchange, realizes that the temperature of outer gas transmission rises, makes outer
Defeated gas water dew point and hydrocarbon dew point meet the quality index of pipeline gas.To prevent the formation hydrate in throttling process stifled
Pipeline is filled in, fills hydrate inhibitor (methanol) on the pre- cold air admission line in heat exchanger front end of more standing.Concrete principle is as follows:
Methanol from methanol tank by methanol dispenser pump pressurization after, by methanol fill pipeline be injected into pre- cold air into
In gas pipeline, it can prevent condensate gas from forming hydrate in throttling；
The natural gas (8.6MPa, 23 DEG C) just separated is carried out through production of hydrocarbons separator, it is defeated by pre- cold air admission line
It send into heat exchanger of more standing, changes cold with the cryogenic natural gas (6.5MPa, -6 DEG C) of dew point separator processing, recycle the heat of pre- cold air
Amount, is preheated to 14.5 DEG C from -6 DEG C for outer defeated natural gas；
The natural gas (8.6MPa, 4 DEG C) of heat exchanger of more being stood pre-cooling throttles through throttle valve to 6.52MPa, and -6.5 DEG C into dew
Separator is put, condensation water and heavy hydrocarbon component in cryogenic separation natural gas meet outbound gas water dew point and hydrocarbon dew point
The quality index of pipeline gas.
The utility model has the beneficial effects that
It is provided by the utility model reduce condensate gas hydrocarbon, water dew point processing system be for gas condensate field in early stage pilot production
Stage builds the problem that cost of investment is larger in condensation gas processing system, builds a set of easy condensation gas processing system, makes day
Right gas utilizes pressure itself energy, by reducing pressure by regulating flow, cryogenic separation, to realize the mesh for reducing outbound natural gas hydrocarbons, water dew point
, it is allowed to meet the quality index of national pipeline gas.The processing system, principle is understandable, and short flow, saving accounts for
Ground is reduced investment outlay, and management is facilitated, and meets the production requirement of gas condensate field pre-production phase, while having evaded investment risk.
Detailed description of the invention
Fig. 1 is the utility model overall structure diagram.
1, methanol tank 2, methanol outflow pipeline 3, methanol dispenser pump 4, methanol inject pipeline
5, pre- cold air admission line 6, more stand heat exchanger 7, pre- cold air outlet line 8, throttle valve
9, admission line 10, dew point separator 11, pre- hot gas admission line 12, external transport pipeline after throttling
13, defeated system 14, NGL flow out pipeline 15, lime set control valve outside natural gas
16, lime set processing system 17, blow-down pipe 18, safety valve 19, emptying header
20, blowdown system.
Specific embodiment
It please refers to shown in Fig. 1:
Novel reduction condensate gas hydrocarbon provided by the utility model, water dew point processing system include methanol tank 1, more stand
Heat exchanger 6 and dew point separator 10, wherein methanol tank 1 flows out pipeline 2 by methanol and is connected with methanol dispenser pump 3, methanol note
Enter pipeline 4 and connect methanol dispenser pump 3 and pre- cold air admission line 5, pre- cold air admission line 5 is connected to more station heat exchanger 6, more stands
Heat exchanger 6 passes through admission line 9 and pre- hot gas admission line 11 and 10 phase of dew point separator after pre- cold air outlet line 7, throttling
Connection.
More station heat exchanger 6 is connected by external transport pipeline 12 with system 13 defeated outside natural gas, and dew point separator 6 passes through NGL
Outflow pipeline 14 is connected with lime set processing system 16.
Dew point separator 10 by blow-down pipe 17 and emptying header 19 is connected with blowdown system 20, blow-down pipe 17 and
Emptying header 19 is connected by safety valve 18.
Pre- cold air outlet line 7 is equipped with throttle valve 8, and 8 front-end and back-end of throttle valve are designed with gate valve.
NGL flows out pipeline 14 and is equipped with lime set control valve 15.
Working principle of the utility model is:
Using the pressure energy of natural gas itself, exchanged by more standing heat exchanger 6 with outer gas transmission heat natural gas is carried out it is pre-
The throttle valve 8 more stood on the pre- cold air outlet line 7 of heat exchanger 6 is opened in cold treatment, is carried out throttling refrigeration to natural gas, is reduced day
Right temperature degree is to -5 DEG C, and natural gas is delivered to dew point separator 10 after cooling, and cryogenic separation recycles the NGL component in natural gas,
10 gas outlet pipeline of dew point separator is connected to more station heat exchanger 6 and pre- cold air carries out heat exchange, realizes the temperature of outer gas transmission
Degree rises, and outer defeated gas water dew point and hydrocarbon dew point is made to meet the quality index of pipeline gas.To prevent in throttling process
Hydrate Plugging pipeline is formed, fills hydrate inhibitor (methanol) on the pre- cold air admission line 5 in 6 front end of heat exchanger of more standing.
Concrete principle is as follows:
Methanol from methanol tank 1 injects pipeline 4 by methanol and is injected into pre-cooling after the pressurization of methanol dispenser pump 3
In gas admission line 5, it can prevent condensate gas from forming hydrate in throttling；
The natural gas (8.6MPa, 23 DEG C) just separated is carried out through production of hydrocarbons separator, it is defeated by pre- cold air admission line 5
It send into heat exchanger 6 of more standing, changes cold with the cryogenic natural gas (6.5MPa, -6 DEG C) of the processing of dew point separator 10, recycle pre- cold air
Heat, outer defeated natural gas is preheated to 14.5 DEG C from -6 DEG C；
The natural gas (8.6MPa, 4 DEG C) of heat exchanger 6 of more being stood pre-cooling throttles through throttle valve 8 to 6.52MPa, -6.5 DEG C into
Dew point separator 10, condensation water and heavy hydrocarbon component in cryogenic separation natural gas, makes outbound gas water dew point and hydrocarbon dew point
Meet the quality index of pipeline gas.
Claims (5)
1. the processing system of a kind of novel reduction condensate gas hydrocarbon, water dew point, it is characterised in that: include that methanol tank, more station are changed
Hot device and dew point separator, wherein methanol tank flows out pipeline by methanol and is connected with methanol dispenser pump, and methanol injects pipeline and connects
Methanol dispenser pump and pre- cold air admission line are connect, pre- cold air admission line is connected to more station heat exchanger, and more station heat exchanger passes through pre-
Admission line and pre- hot gas admission line are connected with dew point separator after cold air outlet line, throttling.
2. the processing system of a kind of novel reduction condensate gas hydrocarbon according to claim 1, water dew point, it is characterised in that: institute
The more station heat exchanger stated is connected by external transport pipeline with system defeated outside natural gas, dew point separator by NGL flow out pipeline with
Lime set processing system is connected.
3. the processing system of a kind of novel reduction condensate gas hydrocarbon according to claim 1, water dew point, it is characterised in that: institute
The dew point separator stated is connected by blow-down pipe and emptying header with blowdown system, and blow-down pipe and emptying header pass through peace
Full valve is connected.
4. the processing system of a kind of novel reduction condensate gas hydrocarbon according to claim 1, water dew point, it is characterised in that: institute
The pre- cold air outlet line stated is equipped with throttle valve, and throttle valve front-end and back-end are designed with gate valve.
5. the processing system of a kind of novel reduction condensate gas hydrocarbon according to claim 2, water dew point, it is characterised in that: institute
The NGL outflow pipeline stated is equipped with lime set control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821818818.4U CN209468386U (en) | 2018-11-06 | 2018-11-06 | A kind of processing system of novel reduction condensate gas hydrocarbon, water dew point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821818818.4U CN209468386U (en) | 2018-11-06 | 2018-11-06 | A kind of processing system of novel reduction condensate gas hydrocarbon, water dew point |
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| CN209468386U true CN209468386U (en) | 2019-10-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700456A (en) * | 2021-08-26 | 2021-11-26 | 北京大漠石油工程技术有限公司 | Natural gas modularization pilot production device |
| CN115046422A (en) * | 2022-07-11 | 2022-09-13 | 西安石油大学 | Dew point corrosion prevention and control method for precooling heat exchanger of mixed refrigerant liquefaction system |
-
2018
- 2018-11-06 CN CN201821818818.4U patent/CN209468386U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700456A (en) * | 2021-08-26 | 2021-11-26 | 北京大漠石油工程技术有限公司 | Natural gas modularization pilot production device |
| CN115046422A (en) * | 2022-07-11 | 2022-09-13 | 西安石油大学 | Dew point corrosion prevention and control method for precooling heat exchanger of mixed refrigerant liquefaction system |
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