CN1072106A - Dewatering pre-treating method of freezing method for natural gas of oil gas field - Google Patents
Dewatering pre-treating method of freezing method for natural gas of oil gas field Download PDFInfo
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- CN1072106A CN1072106A CN91110570A CN91110570A CN1072106A CN 1072106 A CN1072106 A CN 1072106A CN 91110570 A CN91110570 A CN 91110570A CN 91110570 A CN91110570 A CN 91110570A CN 1072106 A CN1072106 A CN 1072106A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a kind of dewatering pre-treating method of freezing method for natural gas of oil gas field.It is to switch freezing mode the employing cycle, moisture in the natural gas in oil and gas fields and hydro carbons hyrate is frozen in condensation-evaporimeter, and the condensation heat that discharges with cold-producing medium then, it is thawed removes the preprocess method of moisture.General compression-type refrigeration circulation, cold-producing medium employing ammonia, freon and the propane of adopting.The present invention compares with other dewatering has advantages of simple technological process, equipment investment expense and economic operating cost, and degree of dehydration can be according to making things convenient for adjustment from different places, and dehydrating effect is obvious, guarantees that natural gas in oil and gas fields does not freeze safe transport in the winter time.
Description
The present invention relates to the dewatering of gas, especially relate to dewatering pre-treating method of freezing method for natural gas of oil gas field.
The content of water vapour in the natural gas, general requirement is no more than 1.0～1.2 kilograms in per hundred ten thousand steres, to guarantee the smooth operation of natural gas transmission pipe.Particularly, require the water content in per hundred ten thousand stere natural gases should not be higher than 0.6 kilogram for long distance conveying in the winter of cold district.
The main source of moisture is to be stored in vapour field or oil field stratum in the natural gas, has added a large amount of water vapours or hot water during exploitation again, under temperature in the stratum and the pressure in the natural gas moisture be saturation state.After natural gas was guided to ground, temperature and pressure slightly fell, and the part hydrogenesis is told through preseparator, but remaining moisture still can be in course of conveying Yin Wendu or pressure reduce and form hyrate or ice cube hinders operation so that blocking pipe.Particularly be lower than after-20 ℃ at the cold district winter temperature, breaking of pipeline can't be operated even cause to conveyance conduit may owing to the formation of hyrate or ice cube.So from the gas field or the natural gas that comes of oil field or associated gas should be with moisture removal wherein to certain degree.The method of gas dehydration is a lot, and absorption method, absorption process, cooling, pressurization cooling method, method of chemical treatment etc. are arranged.But evaporation commonly used is absorption process and absorption method.
Absorption process dehydration is to adopt diethylene glycol and triethylene glycol etc. to be absorbent, in the absorption tower with the moisture absorption in the natural gas.Suction back dilute solution of ethylene glycol must be through the regeneration of heating decompression dehydration enrichment, and dense then ethylene glycol solution recycles.Before this method dehydration, need earlier with the free oil elder generation Ex-all that contains in the natural gas, in order to avoid ethylene glycol generation foaming phenomenon causes the difficulty that absorbs operation.The shortcoming of absorption process dehydration is equipment complexity, cost height, and operating condition control is difficult for, degree of dehydration is not high, and the absorbent loss is big, and running cost is higher.
The absorption method dehydration can remove more juicy than absorption process.This dewatering is that thermal regeneration is carried out in the saturated back shut-down operation of adsorbent with solid absorbents such as activated aluminum, silica gel, aluminum oxide and molecular sieve absorbed natural gas middle moisture in adsorption tower.Enable the another absorber again and continue dehydration.Two absorbers are used alternatingly.But this method dehydration needs earlier the natural gas pressurization to be cooled off, and thermal regeneration then reduces pressure.So, though good equipment of its dehydrating effect and operating cost costliness, required deep dehydration when being suitable for natural gas processing.As for traditional cooling method dehydration is that natural gas is cooled to uniform temperature, and condensation separates it after going out moisture.But, do not reach natural gas in the cold district long requirement in winter apart from conveying because degree of dehydration is low.Adopt the pressurization cooling method, though can improve degree of dehydration, equipment and operating cost are very high, and the operating procedure problem is more, are difficult to use.
The purpose of this invention is to provide a kind of dewatering pre-treating method of freezing method for natural gas of oil gas field, to guarantee the smooth delivery of power of natural gas in oil and gas fields appendix.
The present invention takes following method in order to achieve the above object, it is the employing cycle to switch freezing mode, moisture in the natural gas in oil and gas fields and hydro carbons hyrate are frozen in condensation-evaporimeter, and the condensation heat that discharges with cold-producing medium is thawed it and is removed the preprocess method of moisture then.
Elaborate below in conjunction with accompanying drawing.
Accompanying drawing is the dewatering pre-treating method of freezing method for natural gas of oil gas field schematic flow sheet.
The natural gas in oil and gas fields handling process is: natural gas in oil and gas fields (being called for short NG) is sent into heat exchanger 1 by the delivery main and is cooled off with cold dry gas heat exchange, remove the moisture and heavy hydrocarbon liquid of condensation through gas-liquid separator 2 after, by NG reversal valve 4, again through condensation-evaporimeter 6, at this, the liquid refrigerant of it and boiling in ducts carries out heat exchange, and its moisture and hydro carbons hyrate are frozen in condensation-evaporimeter.Cold-producing medium and cryogenic temperature are determined by the dehydration degree of depth (dew point).Through NG reversal valve 5, gas-liquid separator 3 returns heat exchanger 1, imports gas transmission main after the re-heat then.
The cold-producing medium flow process is: the high-temperature high-pressure refrigerant gas that is come out by refrigeration compressor 13, through water cooler 11 coolings, by cold-producing medium reversal valve 8, be condensed into refrigerant liquid through condensation-evaporimeter 7 again, then by flow controller 10 step-down throttling refrigeration condensation-evaporimeter 6 in, emitting self vaporizes behind the cold returns refrigeration compressor low pressure suction inlet by cold-producing medium reversal valve, 9 again.
Owing to the outer a certain amount of ice (frost) that freezed of condensation-evaporimeter 6 its pipe when the condensation NG causes the heat exchange property deterioration.So the cycle of need is switched four reversal valves 4,5,8,9, enters another flow process.Switching cycle was generally 8-12 hour.
Thereafter, the natural gas in oil and gas fields flow process is: natural gas in oil and gas fields is sent into heat exchanger 1 cooling, remove the moisture and heavy hydrocarbon liquid of condensation through gas-liquid separator 2 after, by NG reversal valve 4, through condenser/evaporator 7 its moisture and hydro carbons hyrate are freezed again, through NG reversal valve 5, gas-liquid separator 3 returns heat exchanger 1 then.
The cold-producing medium flow process is: the high-temperature high-pressure refrigerant gas that is come out by compressor 13 cools off through water cooler 11, by cold-producing medium reversal valve 9, be condensed into refrigerant liquid through condensation-evaporimeter 6 again, then by flow controller 10 step-down throttling refrigeration in condensation-evaporimeter 7, self gasify after emitting cold, by cold-producing medium reversal valve 9, return the refrigeration compressor low-pressure inlet again.Go round and begin again like this, reach the purpose of lyophilization.
Gas-liquid separator 2,3 separates with condensation-evaporimeter 6,7 and the moisture that thaws and mix hydrocarbon and enter receiver 14.General compression-type refrigeration circulation, cold-producing medium employing ammonia, freon and the propane of adopting.In order to control condensation-evaporator condensation thermal discharge.Adopt pressure or temperature control valve (TCV) 12 to control the inflow of water cooler.The balance of cold and heat need be passed through accurate heat Balance Calculation.
The present invention compares with other dewatering, have advantages of simple technological process, equipment investment expense and operating cost are all economized, and degree of dehydration can be according to making things convenient for from different places adjustment, dehydrating effect is obvious, guarantees that natural gas or associated gas do not freeze safe transport in the winter time. And, in dehydration, mixed hydrocarbon that can attached product some, particularly to rich NG, its economic benefit is more considerable.
Claims (3)
1, a kind of dewatering pre-treating method of freezing method for natural gas of oil gas field, it is characterized in that, it is the employing cycle to switch freezing mode, moisture in the natural gas in oil and gas fields and hydro carbons hyrate are frozen in condensation-evaporimeter, the condensation heat that discharges with cold-producing medium then, it is thawed removes the preprocess method of moisture.
2, a kind of dewatering pre-treating method of freezing method for natural gas of oil gas field according to claim 1 is characterized in that the idiographic flow of the dehydration preprocess method of said freezing-thaw, wherein,
A. the natural gas in oil and gas fields handling process is:
Natural gas in oil and gas fields is sent into heat exchanger (1) cooling, after gas-liquid separator (2) is removed the moisture of condensation and heavy hydrocarbon liquid by NG reversal valve (4), through condensation-evaporimeter (6) its moisture and hydro carbons hyrate are freezed again, through NG reversal valve (5), gas-liquid separator (3) returns heat exchanger (1) then;
B. the cold-producing medium flow process is:
The high-temperature high-pressure refrigerant gas that is come out by refrigeration compressor (13) cools off through water cooler (11), by cold-producing medium reversal valve (8), be condensed into refrigerant liquid through condenser/evaporator (7) again, then by flow controller (10) step-down throttling refrigeration condensation-evaporimeter (6) in, emitting self vaporizes behind the cold returns refrigeration compressor low pressure suction inlet by cold-producing medium reversal valve (9) again;
With four reversal valves (4), (5), (8), (9) periodic reverse, thereafter,
C. the natural gas in oil and gas fields handling process is:
Natural gas in oil and gas fields is sent into heat exchanger (1) cooling, remove the moisture and heavy hydrocarbon liquid of condensation through gas-liquid separator (2) after, by NG reversal valve (4), again through condensation-evaporimeter (7), its moisture and hydro carbons hyrate are freezed, through reversal valve (5), gas-liquid separator (3) returns heat exchanger (1) then;
D. the cold-producing medium flow process is:
The high-temperature high-pressure refrigerant gas that is come out by refrigeration compressor (13) cools off through water cooler (11), by cold-producing medium reversal valve (9), be condensed into refrigerant liquid through condensation-evaporimeter (6) again, then by flow controller (10) step-down throttling refrigeration condensation-evaporimeter (7) in, emitting self vaporizes behind the cold returns refrigeration compressor low pressure suction inlet by cold-producing medium reversal valve (9) again;
Separate and the moisture that thaws and mix hydrocarbon and enter receiver (14) gas-liquid separator (2), (3) and condensation-evaporimeter (6), (7), adopts pressure or temperature control valve (TCV) (12) to control the inflow of water cooler (11).
3, a kind of dewatering pre-treating method of freezing method for natural gas of oil gas field according to claim 1 and 2 is characterized in that said cold-producing medium is ammonia, freon and propane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91110570A CN1034852C (en) | 1991-11-05 | 1991-11-05 | Dewatering pre-treating method of freezing method for natural gas of oil gas field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91110570A CN1034852C (en) | 1991-11-05 | 1991-11-05 | Dewatering pre-treating method of freezing method for natural gas of oil gas field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1072106A true CN1072106A (en) | 1993-05-19 |
| CN1034852C CN1034852C (en) | 1997-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91110570A Expired - Fee Related CN1034852C (en) | 1991-11-05 | 1991-11-05 | Dewatering pre-treating method of freezing method for natural gas of oil gas field |
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| CN (1) | CN1034852C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420732C (en) * | 2006-03-31 | 2008-09-24 | 辽河石油勘探局 | Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas |
| CN101108978B (en) * | 2006-07-19 | 2011-04-20 | 吕应中 | Hydrocarbons gas processing method and apparatus thereof |
| CN104266213A (en) * | 2014-09-04 | 2015-01-07 | 程洪亮 | Temperature raising and natural gas saving machine combusting natural gas |
| CN105316054A (en) * | 2015-10-28 | 2016-02-10 | 贵惠莱新能源科技股份(上海)有限公司 | Natural gas freeze dehydration and dealkylation system |
| CN106321058A (en) * | 2016-08-30 | 2017-01-11 | 惠州市柯帝士科技有限公司 | Oil gas cold treatment method |
| CN107921356A (en) * | 2015-09-02 | 2018-04-17 | 埃克森美孚上游研究公司 | Become the relevant device and system of adsorption method |
| CN109097122A (en) * | 2018-09-21 | 2018-12-28 | 四川贵源石油化工工程有限公司 | Moisture blow-through natural gas in low temperature is dehydrated hydrocarbon removal process |
-
1991
- 1991-11-05 CN CN91110570A patent/CN1034852C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420732C (en) * | 2006-03-31 | 2008-09-24 | 辽河石油勘探局 | Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas |
| CN101108978B (en) * | 2006-07-19 | 2011-04-20 | 吕应中 | Hydrocarbons gas processing method and apparatus thereof |
| CN104266213A (en) * | 2014-09-04 | 2015-01-07 | 程洪亮 | Temperature raising and natural gas saving machine combusting natural gas |
| CN107921356A (en) * | 2015-09-02 | 2018-04-17 | 埃克森美孚上游研究公司 | Become the relevant device and system of adsorption method |
| CN105316054A (en) * | 2015-10-28 | 2016-02-10 | 贵惠莱新能源科技股份(上海)有限公司 | Natural gas freeze dehydration and dealkylation system |
| CN105316054B (en) * | 2015-10-28 | 2019-04-09 | 贵惠莱新能源科技股份(上海)有限公司 | A kind of natural gas lyophilization de-hydrocarbon system |
| CN106321058A (en) * | 2016-08-30 | 2017-01-11 | 惠州市柯帝士科技有限公司 | Oil gas cold treatment method |
| CN106321058B (en) * | 2016-08-30 | 2019-07-30 | 金妙英 | Oil gas cold treatment method |
| CN109097122A (en) * | 2018-09-21 | 2018-12-28 | 四川贵源石油化工工程有限公司 | Moisture blow-through natural gas in low temperature is dehydrated hydrocarbon removal process |
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| Publication number | Publication date |
|---|---|
| CN1034852C (en) | 1997-05-14 |
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