CN106837270B - Device and process for preventing gas channeling of carbon dioxide flooding oil extraction wellhead - Google Patents
Device and process for preventing gas channeling of carbon dioxide flooding oil extraction wellhead Download PDFInfo
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- CN106837270B CN106837270B CN201710178943.7A CN201710178943A CN106837270B CN 106837270 B CN106837270 B CN 106837270B CN 201710178943 A CN201710178943 A CN 201710178943A CN 106837270 B CN106837270 B CN 106837270B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000605 extraction Methods 0.000 title claims abstract description 38
- 230000005465 channeling Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 27
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims description 64
- 239000003129 oil well Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 9
- 230000002265 prevention Effects 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000010779 crude oil Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 60
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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Classifications
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fats And Perfumes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a device and a process for preventing gas channeling of a carbon dioxide flooding oil extraction wellhead, wherein the oil extraction wellhead is provided with an oil extraction wellhead device, the oil extraction wellhead device is provided with a sleeve gas outlet and an oil pipe outlet, the sleeve gas outlet is connected to a safety relief outlet through a pipeline I, the oil pipe outlet is connected to a well site valve group through a pipeline II, the pipeline I is communicated with the pipeline II through a pipeline III, a valve I and a constant pressure sleeve gas valve are arranged between the pipeline I and the pipeline II respectively, a safety valve is also arranged on the pipeline I, the safety valve is arranged between the valve I and the safety relief outlet, a valve II is also arranged on the pipeline II, and the valve II is arranged between the constant pressure sleeve gas valve and the well site valve group.
Description
Technical Field
The invention relates to a flow of an oilfield well site driven by carbon dioxide and other gases, in particular to a device and a process for preventing gas channeling of a carbon dioxide driven oil extraction wellhead.
Background
Long-term oilfield belongs to a typical ultra/ultra low permeability reservoir,poor physical properties of reservoirs, strong heterogeneity, development of microcracks and high original gas-oil ratio. After the carbon dioxide oil displacement technology is tested in the oil area, the higher gas channeling risk exists, and the gas-oil ratio prediction can reach 1000m 3 Above/t; once gas channeling occurs, the safety of a ground gathering and transportation pipe network and a downstream oil and gas gathering and transportation station is seriously threatened.
At present, most of the oil fields in which carbon dioxide oil displacement tests are carried out in China adopt a manual emptying mode of the wellhead of the christmas tree to directly release pressure, so that the labor intensity of operators is increased, and serious potential safety hazards exist. Thus, breaking CO 2 The oil displacement technology and the ground engineering safety problem are imperative.
Disclosure of Invention
The invention aims to solve the technical problem that potential safety hazards exist in the process of channeling gas at a carbon dioxide flooding oil extraction well, and provides a device and a process for preventing the channeling gas at the carbon dioxide flooding oil extraction well.
The technical scheme of the invention is that the device and the process for preventing gas channeling of the carbon dioxide flooding oil extraction wellhead are provided, the oil extraction wellhead is provided with an oil extraction wellhead device, the oil extraction wellhead device is provided with a sleeve gas outlet and an oil pipe outlet, the sleeve gas outlet is connected to a safety relief outlet through a first pipeline, the oil pipe outlet is connected to a well site valve group through a second pipeline, the first pipeline is communicated with the second pipeline through a third pipeline, a valve I and a constant pressure sleeve gas valve are arranged between the first pipeline and the third pipeline respectively, a safety valve is also arranged on the first pipeline, the safety valve is positioned between the valve I and the safety relief outlet, a valve II is also arranged on the second pipeline, and the valve II is positioned between the constant pressure sleeve gas valve and the well site valve group.
And a valve III is further arranged on the pipeline I, and the valve III and the safety valve are connected in parallel between the valve I and the safety relief outlet.
And the pipeline III is a metal hose pipeline.
The relief valve both ends all are provided with the valve, and all adopt the ball valve.
And the first valve and the third valve adopt ball valves.
And the second valve adopts a gate valve.
A carbon dioxide flooding oil extraction wellhead gas channeling prevention process at least comprises the following steps:
step 1) when the oil well is in normal production, the safety valve and the valve III are in a closed state, associated gas in the oil well passes through the valve I, passes through the valve III, and then is mixed with crude oil extracted from the oil pipe outlet after passing through the valve III to the constant-pressure sleeve gas valve, and finally is switched to a well site valve group through the valve II to be delivered out after being delivered to a metering system or directly delivered out, so that a well site single-pipe oil collecting flow is realized;
step 2) when gas channeling occurs in the oil well, the pressure in the pipeline I rises, when the pressure reaches the tripping pressure set by the safety valve, the safety valve is opened, associated gas directly reaches the safety release outlet from the casing gas outlet and is discharged to a designated recovery point, and when the pressure in the pipeline I is recovered to be normal, the operation according to the step 1) is continued;
and 3) when the gas channeling is serious, the fluid pressure in the safety valve suddenly drops, the phenomenon of freeze blocking of hydrate occurs, the safety valve is damaged and can not normally operate, at the moment, the valve III is manually opened, so that associated gas is discharged to a safety discharge outlet to be discharged to a designated recovery point, and when the pressure in the pipeline I is recovered to be normal, the safety valve is replaced, and the operation according to the step 1) is continued.
The valve I, the constant pressure sleeve air valve and the valve II are always in an open state when the oil well works.
The invention has the beneficial effects that:
the device and the process for preventing gas channeling of the carbon dioxide flooding oil extraction wellhead are simple in structure and convenient to operate, the automatic relief function of the overpressure of the gas channeling of the wellhead is realized through the opening and closing of the safety valve and the valve III, the device and the process are simple in process, optimized in flow, high in safety and reliability, safe and environment-friendly, the safety of a ground gathering and transportation pipe network and a downstream oil and gas station site can be effectively guaranteed, the life safety of operators can be guaranteed, the labor intensity of the operators is reduced, the requirements of test, production and operation safety are met, the device and the process are suitable for the gas channeling prevention process of the carbon dioxide flooding oil extraction wellhead, the device and the process are also suitable for the gas channeling prevention process of the wellhead of other gas flooding oil extraction wells, the single-pipe gathering of the well site of a gas flooding oil extraction field can be realized, and the device and the process has wide application prospect in a test or an oil field adopting tertiary oil extraction.
According to the device and the process for preventing gas channeling of the carbon dioxide flooding oil extraction wellhead, the valve III is arranged on the pipeline I and connected with the safety valve in parallel, when the safety valve fails, the valve III is opened, and associated gas reaches the safety discharge outlet through the valve III, so that the operation is convenient, and the safety production is ensured.
The device and the process for preventing the gas channeling of the carbon dioxide flooding oil extraction wellhead can adapt to small-space installation and reduce the stress damage of the pipeline by adopting the metal flexible pipeline as the pipeline III.
According to the device and the process for preventing gas channeling of the carbon dioxide flooding oil extraction wellhead, the valves are arranged at the two ends of the safety valve, and the ball valves are adopted, so that a pipeline can be cut off, the safety valve is convenient to replace and overhaul, and meanwhile, associated gas overflow when the safety valve is damaged can be prevented.
The device for preventing gas channeling of the carbon dioxide flooding oil extraction wellhead and the process valve I and the valve III provided by the invention adopt ball valves, and the valve II adopts gate valves, so that sealing is ensured.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the device for preventing gas channeling of a carbon dioxide flooding oil production wellhead.
Reference numerals illustrate: 1. an oil extraction wellhead; 2. a wellhead assembly for producing oil; 3. a sleeve gas outlet; 4. an oil pipe outlet; 5. a first pipeline; 6. a second pipeline; 7. a third pipeline; 8. a valve I; 9. a constant pressure sleeve air valve; 10. a safety valve; 11. a second valve; 12. a safety vent outlet; 13. a well site valve bank; 14. and a third valve.
Description of the embodiments
Examples
In order to overcome the technical problem that the carbon dioxide flooding oil extraction wellhead gas has potential safety hazards, the embodiment provides a carbon dioxide flooding oil extraction wellhead gas channeling prevention device and a process as shown in fig. 1, an oil extraction wellhead device 2 is arranged on the oil extraction wellhead 1, a sleeve gas outlet 3 and an oil pipe outlet 4 are arranged on the oil extraction wellhead device 2, the sleeve gas outlet 3 is connected to a safety relief outlet 12 through a pipeline I5, the oil pipe outlet 4 is connected to a well site valve group 13 through a pipeline II 6, the pipeline I5 is communicated with the pipeline II 6 through a pipeline III 7, a valve I8 and a constant pressure sleeve gas valve 9 are arranged between the pipeline I5 and the pipeline II 6 and the pipeline III 7 respectively, a safety valve 10 is further arranged on the pipeline I5, the safety valve 10 is arranged between the valve I8 and the safety relief outlet 12, a valve II 11 is further arranged on the pipeline II 6, and the valve II 11 is arranged between the constant pressure sleeve gas valve 9 and the well site valve group 13. The wellhead assembly 2 described in the present invention is of a known art and will not be described in detail here.
The invention relates to a process for preventing gas channeling at the wellhead of a carbon dioxide flooding oil extraction well, which at least comprises the following steps:
step 1) when the oil well is in normal production, the safety valve 10 and the valve III 14 are in a closed state, associated gas in the oil well is mixed with crude oil extracted from the oil pipe outlet 4 after passing through the valve I8, passing through the pipeline III 7 and the constant pressure sleeve gas valve 9, and finally, the mixture is switched to a metering system through the valve II 11 to the well site valve group 13 for output or direct output, so that a single-pipe oil collecting flow of the well site is realized;
step 2) when gas channeling occurs in the oil well, the pressure in the first pipeline 5 is increased, when the pressure reaches the tripping pressure set by the safety valve 10, the safety valve 10 is opened, associated gas directly flows out from the casing gas outlet 3 to the safety relief outlet 12 and is discharged to a designated recovery point, and when the pressure in the first pipeline 5 is recovered to be normal, the operation according to the step 1) is continued;
and 3) when the gas channeling is serious, the fluid pressure in the safety valve 10 suddenly drops, the phenomenon of hydrate freezing and blocking occurs, the safety valve 10 is damaged and cannot normally operate, at the moment, the valve III 14 is manually opened, so that associated gas is discharged to the safety discharge outlet 12 to be discharged to a designated recovery point, and when the pressure in the pipeline I5 is recovered to be normal, the safety valve 10 is replaced, and the operation according to the step 1) is continued.
The valve I8, the constant pressure sleeve air valve 9 and the valve II 11 are always in an open state when the oil well works.
The device and the process for preventing gas channeling of the carbon dioxide flooding oil extraction wellhead are simple in structure and convenient to operate, the automatic relief function of the overpressure of the gas channeling of the wellhead is realized through the opening and closing of the safety valve and the valve III, the device and the process are simple in process, optimized in flow, high in safety and reliability, safe and environment-friendly, the safety of a ground gathering and transportation pipe network and a downstream oil and gas station site can be effectively guaranteed, the life safety of operators can be guaranteed, the labor intensity of the operators is reduced, the requirements of test, production and operation safety are met, the device and the process are suitable for the gas channeling prevention process of the carbon dioxide flooding oil extraction wellhead, the device and the process are also suitable for the gas channeling prevention process of the wellhead of other gas flooding oil extraction wells, the single-pipe gathering of the well site of a gas flooding oil extraction field can be realized, and the device and the process has wide application prospect in a test or an oil field adopting tertiary oil extraction.
Examples
On the basis of embodiment 1, as shown in fig. 1, the embodiment provides a device and a process for preventing gas channeling of a carbon dioxide flooding oil production wellhead, a valve three 14 is further arranged on a pipeline one 5, the valve three 14 and a safety valve 10 are connected in parallel between the valve one 8 and a safety discharge outlet 12, when the safety valve 10 fails, the valve three 14 is opened, associated gas reaches the safety discharge outlet 12 through the valve three 14, the operation is convenient, and the safety production is ensured.
And the pipeline III 7 is a metal soft pipeline, can be suitable for small-space installation, and reduces the stress damage of the pipeline.
The safety valve 10 both ends all are provided with the valve, and all adopt the ball valve, but the shut-off pipeline is convenient for the safety valve change and overhaul, can prevent simultaneously that the associated gas from spilling over when the safety valve is impaired, and under the device normal operating condition, these two ball valves are in normally open state.
The first valve 8 and the third valve 14 adopt ball valves, and the second valve 11 adopts gate valves, so that sealing is ensured.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (1)
1. A process for preventing gas channeling at the wellhead of a carbon dioxide flooding oil extraction well is characterized by comprising the following steps of: the carbon dioxide flooding oil extraction wellhead gas channeling prevention device adopted by the process comprises the following components: be provided with oil recovery wellhead assembly (2) on oil recovery wellhead assembly (1), be equipped with sleeve pipe gas export (3) and oil pipe export (4) on oil recovery wellhead assembly (2), sleeve pipe gas export (3) are connected to safety relief export (12) through pipeline one (5), and oil pipe export (4) are connected to well site valves (13) through pipeline two (6), its characterized in that: the pipeline I (5) is communicated with the pipeline II (6) through a pipeline III (7), a valve I (8) and a constant pressure sleeve air valve (9) are arranged between the pipeline I (5) and the pipeline II (6) respectively, the pipeline I (5) is also provided with a safety valve (10), the safety valve (10) is positioned between the valve I (8) and a safety discharge outlet (12), the pipeline II (6) is also provided with a valve II (11), and the valve II (11) is positioned between the constant pressure sleeve air valve (9) and a well site valve group (13);
a valve III (14) is further arranged on the pipeline I (5), the valve III (14) and the safety valve (10) are connected in parallel between the valve I (8) and the safety discharge outlet (12), and when the safety valve (10) fails, the valve III (14) is opened, and associated gas reaches the safety discharge outlet (12) through the valve III (14);
the pipeline III (7) is a metal hose line;
valves are arranged at two ends of the safety valve (10), and ball valves are adopted;
the valve I (8) and the valve III (14) adopt ball valves;
the valve II (11) adopts a gate valve;
a carbon dioxide flooding oil extraction wellhead gas channeling prevention process comprises the following steps:
when the oil well is in normal production, the safety valve (10) and the valve III (14) are in a closed state, associated gas in the oil well is mixed with crude oil extracted from the oil pipe outlet (4) after coming out of the casing gas outlet (3) through the valve I (8) and going to the constant pressure casing gas valve (9) along the pipeline III (7), and finally is switched to the well site valve group (13) through the valve II (11) to be externally conveyed after being subjected to metering system or directly externally conveyed, so that a well site single-pipe oil collection flow is realized;
step 2) when gas channeling occurs in the oil well, the pressure in the first pipeline (5) is increased, when the pressure reaches the tripping pressure set by the safety valve (10), the safety valve (10) is opened, associated gas directly reaches the safety relief outlet (12) from the casing gas outlet (3) and is discharged to a designated recovery point, and when the pressure in the first pipeline (5) is recovered to be normal, the operation according to the step 1) is continued;
step 3) when the gas channeling is serious, the fluid pressure in the safety valve (10) suddenly drops, a hydrate freezing blocking phenomenon occurs, the safety valve (10) is damaged and cannot normally operate, at the moment, the valve III (14) is manually opened, so that associated gas is discharged to a safety discharge outlet (12) to be discharged to a designated recovery point, and when the pressure in the pipeline I (5) is recovered to be normal, the safety valve (10) is replaced, and the operation according to the step 1) is continued;
the valve I (8), the constant pressure sleeve air valve (9) and the valve II (11) are always in an open state when the oil well works.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710178943.7A CN106837270B (en) | 2017-03-23 | 2017-03-23 | Device and process for preventing gas channeling of carbon dioxide flooding oil extraction wellhead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710178943.7A CN106837270B (en) | 2017-03-23 | 2017-03-23 | Device and process for preventing gas channeling of carbon dioxide flooding oil extraction wellhead |
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| Publication Number | Publication Date |
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| CN106837270A CN106837270A (en) | 2017-06-13 |
| CN106837270B true CN106837270B (en) | 2023-05-30 |
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| CN115977568B (en) * | 2022-11-25 | 2024-07-23 | 新疆敦华绿碳技术股份有限公司 | Device and method for preventing gas channeling of carbon dioxide flooding oil extraction wellhead |
| CN116220584B (en) * | 2023-01-09 | 2024-05-31 | 新疆敦华绿碳技术股份有限公司 | CO (carbon monoxide)2Well control system for flooding injection production well and optimization method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2871836Y (en) * | 2006-03-28 | 2007-02-21 | 杨平 | Depressed return-pressure accessory of oil well |
| CN101915074B (en) * | 2010-08-18 | 2013-03-13 | 西安长庆科技工程有限责任公司 | Oil field well casing gas recovery device and process |
| CN102477858A (en) * | 2010-11-23 | 2012-05-30 | 大连创达技术交易市场有限公司 | Recovery device of well casing exhaust gas |
| CN202194628U (en) * | 2011-08-11 | 2012-04-18 | 北京托普威尔石油技术服务有限公司大庆分公司 | Integrated device of Christmas tree and gas well ground construction assembly skid |
| CN204960864U (en) * | 2015-08-07 | 2016-01-13 | 中石化华北油气分公司采油一厂 | Well head flow device of pipeline superpressure environmental protection pressure release |
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