CN102011570B - Process method for CO2 molded ground - Google Patents
Process method for CO2 molded ground Download PDFInfo
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- CN102011570B CN102011570B CN2010105062966A CN201010506296A CN102011570B CN 102011570 B CN102011570 B CN 102011570B CN 2010105062966 A CN2010105062966 A CN 2010105062966A CN 201010506296 A CN201010506296 A CN 201010506296A CN 102011570 B CN102011570 B CN 102011570B
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- injection
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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
- 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
Abstract
The invention discloses a process method for a CO2 molded ground and belongs to the technical field of oil exploitation. The process method for the CO2 molded ground specifically comprises the following steps of: reasonably arranging a CO2 molded ground device; starting a feed pump, supercharging liquid-phase CO2, and inputting supersaturated liquid-phase CO2 into a molding pump; starting the molding pump, and pressurizing the supersaturated liquid-phase CO2 to the injection pressure; and metering and allocating CO2 pressurized to the injection pressure through an injection allocation process, starting a heat exchanger, heating the CO2 which is metered and allocated to the temperature of between 15 and 30 DEG C; and when the volume and energy of the liquid-phase CO2 in a CO2 storage tank is consumed in the molding process, automatically starting a vaporizer to supercharge the CO2 storage tank. The invention has the advantages that the method is simple and can be stably operated, and is a process method for CO2 molded ground which can effectively prevent the molding pump from generating an airlock, prevent blockage of the allocation process so as to make the injection pressure stable, and effectively improves the production efficiency and obviously improves the oil recovery.
Description
Technical field
The invention belongs to technical field of petroleum extraction, relate to the raising oil recovery factor, particularly a kind of CO2 pressure injection surface technology method.
Background technology
Because the CO2 solution gas has the crude oil of making volume expansion, increase kinetic energy in the crude oil, reduce viscosity of crude, improve the mobility ratio of crude oil and water, to improve oil-displacement capacity, particularly have gas drive and de-plugging ability.He both can reclaim the pressure injection oil reservoir with the CO2 in various sources, realized the green exploitation of crude oil, can improve again oil recovery more than 30%.At present, in order fully to excavate the potentiality in existing oil field, CO2 is widely used in the oil exploitation technology.
Existing CO2 pressure injection Above Ground Technology, there is following shortcoming in the irrationality because of its CO2 pressure injection ground installation setting and process:
1. inject the well head medium---the parameters such as the pressure of CO2, temperature change complicated, are the lower saturated liquid of a kind of temperature, cause injection pump frequent occurrence " gas lock " in the pressure injection running, and the injection allocation flow process is stopped up;
2. because carburetor arrangement is not set, can not immediately compensate CO2 storage tank inner volume and energy deficit in the CO2 pressure injection process, cause CO2 storage tank inner volume and energy can not reach balance;
3. because heat exchanger apparatus in position is not set, low temperature CO2 enters the stratum, and the gas injection well near wellbore zone is stopped up, and its Pressure Casting constantly raises, and causes pressure injection can not normally carry out or the ever-increasing serious consequence of pressure injection difficulty.
Summary of the invention
The object of the invention is to overcome the deficiency in the existing CO2 pressure injection Above Ground Technology, " a kind of CO2 pressure injection surface technology method " is provided.This process has that technique is simple, stable, energy-saving and cost-reducing, the advantage of environmental protection, is that " gas lock " occurs a kind of injection pump that can effectively prevent, the CO2 pressure injection surface technology method of oil recovery is stopped up, enhances productivity and significantly improved to the injection allocation flow process.
To achieve these goals, the present invention is achieved through the following technical solutions: a kind of CO2 pressure injection surface technology method specifically comprises the steps:
1). CO2 pressure injection ground installation at first rationally is set, and this pressure injection ground installation mainly comprises CO2 storage tank, vaporizer, feed pump, injection pump, heat exchanger, injection allocation flow process.Described vaporizer is arranged between the bottom liquid phases outlet and upper end gas phase entrance of CO2 storage tank, feed pump is arranged between the bottom liquid phases outlet and injection pump of CO2 storage tank, be connected with the injection pump input port with CO2 storage tank upper end gas phase entrance respectively by return valve 7, the injection allocation flow setting is between injection pump and heat exchanger, described heat exchanger is arranged between injection allocation flow process and the gas injection well head, and its input port is connected with the injection allocation flow process by control and regulation valve 8;
2). start feed pump, the liquid phase CO2 that will input from the CO2 storage tank is pressurized to 2.2-2.4MPa, to injection pump input supersaturation liquid phase CO2;
3). start injection pump, CO2 further is forced into injection pressure to the supersaturation liquid phase;
4). by the injection allocation flow process CO2 that is forced into injection pressure is measured, distributes according to set injection well head quantity, the CO2 after metering, the distribution inputs to each heat exchanger;
5). start heat exchanger, the CO2 after metering, the distribution is heated, be heated to 15 ℃-30 ℃, inject into well;
6). as the liquid phase CO2 in the CO2 storage tank when its volume and energy consume in the pressure injection process, vaporizer is started automatically, and the CO2 storage tank is carried out supercharging.
Step 1) injection pump described in arranges one at least, and described injection allocation flow process arranges two at least, its heat exchanger and the adaptive setting of injection allocation flow process.
Principle and the technical basis of a kind of CO2 pressure injection of the present invention designed device of surface technology method and process are as follows:
Vaporizer; Take supercharging as purpose, the liquid phase CO2 of CO2 tank bottom (liquid state, 2.0MPa ,-20 °) is entered the vaporizer pipeline, utilize the air heat, make the CO2 vaporization, be back to end entrance on the CO2 storage tank with gas phase state, instant compensation CO2 is CO2 storage tank inner volume and energy deficit in the pressure injection process, makes CO2 storage tank inner volume and energy reach balance;
Feed pump: the liquid CO under the saturation state
2Have extremely strong gasification trend, very low viscosity (with the water ratio) and compressibility.During work, suck CO at injection pump
2Process in because the existence of injection pump liquid feed valve drag losses, be in the liquid CO of vapor liquid equilibrium state
2With generating gasification, for preventing CO
2Injection pump generation gas lock phenomenon is at liquid CO
2To carry out supercharging with feed pump before advancing pump, overcome the drag losses of liquid feed valve, guarantee to enter the CO in the pump chamber
2For supersaturated vapor is pressed above liquid phase state, the shortcoming of import feed flow deficiency when remedying simultaneously the injection pump self-priming.
Heat exchanger: to the CO after the supercharging distribution
2Heat, prevent CO
2Enter and cause the crude oil organic matter to separate out obstruction stratum, near wellbore zone after pit shaft chance water generates ice blocks up or enter the stratum, reduce low temperature to the impact on pit shaft, stratum etc.
Return valve: arrange according to the requirement of injection pump equipment specification.This valve is in opening before injection pump starts, close after the injection pump startup is finished, and stops equally need opening this valve before the injection pump.The purpose that this valve is set mainly is to guarantee that injection pump starts under zero load.
Adopt a kind of CO2 pressure injection of the present invention surface technology method compared with prior art, have following advantage:
1. this process has that technique is simple, stable, energy-saving and cost-reducing, the advantage of environmental protection, be that " gas lock " occurs a kind of injection pump that can effectively prevent, the CO2 pressure injection surface technology method of oil recovery is stopped up, enhances productivity and significantly improved to the injection allocation flow process;
2. because being provided with carburetor arrangement between the outlet of the bottom liquid phases of CO2 storage tank and the upper end gas phase entrance, it is in debt immediately to compensate in the CO2 pressure injection process CO2 storage tank inner volume and energy, makes CO2 storage tank inner volume and energy reach balance, stablize;
3. because CO2 storage tank inner volume and energy reach balance, stable, add again between the bottom liquid phases outlet of CO2 storage tank and injection pump to be provided with feed pump that can prevent effectively that injection pump from " gas lock " occuring, the injection allocation flow process is stopped up;
4. because between injection allocation flow process and gas injection well head, being provided with heat exchanger, make and inject the quality assurance that well head medium CO2 obtains pressure, temperature, avoid low temperature CO2 to enter the stratum, effectively prevent the obstruction of gas injection well near wellbore zone, make its Pressure Casting stable, significantly improve oil recovery.
Description of drawings
Fig. 1 is process structure schematic diagram of the present invention.
Fig. 2 is vaporizer of the present invention and CO2 storage tank syndeton schematic diagram.
Fig. 3 is feed pump of the present invention and CO2 storage tank, injection pump syndeton schematic diagram.
Fig. 4 is heat exchanger of the present invention and injection allocation flow process syndeton schematic diagram.
Among the figure: 1.CO2 storage tank, 2. vaporizer, 3. feed pump, 4. injection pump, 5. heat exchanger, 6. injection allocation flow process, 7. return valve, 8. control and regulation valve.
The specific embodiment
Below by non-limiting example, further set forth the present invention, understand the present invention.
Such as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, a kind of CO2 pressure injection of the present invention surface technology method specifically comprises the steps:
1). CO2 pressure injection ground installation at first rationally is set, and this pressure injection ground installation mainly comprises CO2 storage tank, vaporizer, feed pump, injection pump, heat exchanger, injection allocation flow process.Described vaporizer is arranged between the bottom liquid phases outlet and upper end gas phase entrance of CO2 storage tank, feed pump is arranged between the bottom liquid phases outlet and injection pump of CO2 storage tank, be connected with the injection pump input port with CO2 storage tank upper end gas phase entrance respectively by return valve 7, the injection allocation flow setting is between injection pump and heat exchanger, described heat exchanger is arranged between injection allocation flow process and the gas injection well head, and its input port is connected with the injection allocation flow process by control and regulation valve 8;
2). start feed pump, the liquid phase CO2 that will input from the CO2 storage tank is pressurized to 2.2-2.4MPa, to injection pump input supersaturation liquid phase CO2;
3). start injection pump, CO2 further is forced into injection pressure to the supersaturation liquid phase;
4). by the injection allocation flow process CO2 that is forced into injection pressure is measured, distributes according to set injection well head quantity, the CO2 after metering, the distribution inputs to each heat exchanger;
5). start heat exchanger, the CO2 after metering, the distribution is heated, be heated to 15 ℃-30 ℃, inject into well;
6). as the liquid phase CO2 in the CO2 storage tank when its volume and energy consume in the pressure injection process, vaporizer is started automatically, and the CO2 storage tank is carried out supercharging.
Step 1) injection pump described in arranges 2,5 of described injection allocation flow settings, and its heat exchanger arranges 5.The actual mode of occupation of visual user and arranging arbitrarily.
Step 1) in:
CO2 storage tank: volume 120m
3, design pressure 2.5MPa, design temperature-35 ℃;
Vaporizer: evaporating capacity 6.3m
3/ h, design pressure 2.5MPa;
Feed pump: theoretical displacement 12.5m
3/ h;
Injection pump: theoretical displacement 6.3m
3/ h, design pressure 30MPa;
Heat exchanger: use double-tube heat exchanger or the electric heating heat exchanger of hot water heating all can.
Its pipeline and each device are installed to connect and are adopted welding or flange connection.But vaporizer, heat exchanger machine self-control, other equipment all can be bought in market.
Use the result to prove that a kind of CO2 pressure injection of the present invention surface technology method satisfies the requirement of pressure injection CO2 oil-displacing technique fully, guarantees to inject well head CO2 temperature, pressure stability, reliable in quality through test.This process has that technique is simple, stable, energy-saving and cost-reducing, the advantage of environmental protection, that " gas lock " occurs a kind of injection pump that can effectively prevent, the injection allocation flow process is stopped up, is avoided low temperature CO2 to enter the stratum, effectively prevent the obstruction of gas injection well near wellbore zone, make its Pressure Casting stable, Effective Raise production efficiency and significantly improve the CO2 pressure injection surface technology method of oil recovery.
Claims (2)
1. a CO2 pressure injection surface technology method is characterized in that specifically comprising the steps:
1). CO2 pressure injection ground installation at first rationally is set, this pressure injection ground installation mainly comprises CO2 storage tank (1), vaporizer (2), feed pump (3), injection pump (4), heat exchanger (5), injection allocation flow process (6), described vaporizer (2) is arranged between the bottom liquid phases outlet and upper end gas phase entrance of CO2 storage tank (1), feed pump (3) is arranged between the bottom liquid phases outlet and injection pump (4) of CO2 storage tank (1), be connected 4 with CO2 storage tank (1) upper end gas phase entrance with injection pump respectively by return valve (7)) input port is connected, injection allocation flow process (6) is arranged between injection pump (4) and the heat exchanger (5), described heat exchanger (5) is arranged between injection allocation flow process (6) and the gas injection well head, and its input port is connected with injection allocation flow process (6) by control and regulation valves (8);
2). start feed pump (3), the liquid phase CO2 that will input from CO2 storage tank (1) is pressurized to 2.2-2.4MPa, to injection pump (4) input supersaturation liquid phase CO2;
3). start injection pump (4), CO2 further is forced into injection pressure to the supersaturation liquid phase;
4). by injection allocation flow process (6) CO2 that is forced into injection pressure is measured, distributes according to set injection well head quantity, the CO2 after metering, the distribution inputs to each heat exchanger (5);
5). start heat exchanger (5), the CO2 after metering, the distribution is heated, be heated to 15 ℃-30 ℃, inject into well;
6). as the liquid phase CO2 in the CO2 storage tank (1) when its volume and energy consume in the pressure injection process, vaporizer (2) is started automatically, and CO2 storage tank (1) is carried out supercharging.
2. a kind of CO2 pressure injection surface technology method according to claim 1, it is characterized in that, step 1) injection pump described in (4) arranges one at least, and described injection allocation flow process (6) arranges two at least, its heat exchanger (5) and the adaptive setting of injection allocation flow process (6).
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| CN2010105062966A CN102011570B (en) | 2010-09-28 | 2010-09-28 | Process method for CO2 molded ground |
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| CN2010105062966A CN102011570B (en) | 2010-09-28 | 2010-09-28 | Process method for CO2 molded ground |
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| CN102011570B true CN102011570B (en) | 2013-05-29 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103628849A (en) * | 2012-08-23 | 2014-03-12 | 中国石油天然气股份有限公司 | Oil field CO2 injection technology |
| CN104675374B (en) * | 2013-11-29 | 2018-03-13 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Unconventional CO2The site construction technology of pressure break |
| CN103644453B (en) * | 2013-12-06 | 2015-11-18 | 宁波合力机泵有限公司 | A kind of plunger pump anti-aerogenesis liquid medium gasification installation |
| CN115182708A (en) * | 2022-06-27 | 2022-10-14 | 中国石油化工集团有限公司 | High-emission CO 2 Pressure drive pressurizing and heating process method and device |
| CN115596993B (en) * | 2022-12-12 | 2023-04-14 | 中海油能源发展股份有限公司采油服务分公司 | Liquefied CO 2 Offshore oilfield pressure injection device and method |
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| CN2348096Y (en) * | 1998-05-06 | 1999-11-10 | 江苏石油勘探局石油工程技术研究院 | Liquid carbon dioxide injection device |
| CN201236688Y (en) * | 2008-08-08 | 2009-05-13 | 陕西宝大新技术实业有限公司 | Carbon dioxide booster pump injection vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2911629A1 (en) * | 2007-01-19 | 2008-07-25 | Air Liquide | PROCESS FOR EXTRACTING PETROLEUM PRODUCTS USING EXTRACTION AID FLUIDS |
| WO2010101647A2 (en) * | 2009-03-04 | 2010-09-10 | Clean Energy Systems, Inc. | Method of direct steam generation using an oxyfuel combustor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2348096Y (en) * | 1998-05-06 | 1999-11-10 | 江苏石油勘探局石油工程技术研究院 | Liquid carbon dioxide injection device |
| CN201236688Y (en) * | 2008-08-08 | 2009-05-13 | 陕西宝大新技术实业有限公司 | Carbon dioxide booster pump injection vehicle |
Non-Patent Citations (2)
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| 余峰.撬装式CO2压注站的研制及其应用.《钻采工艺》.2006,第29卷(第3期),53-64,65. |
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Effective date of registration: 20190508 Address after: 225300 Wuliqiao Trial Production Brigade Complex Building, Chengdong Street Development Zone, Hailing District, Taizhou City, Jiangsu Province Patentee after: Taizhou Youheng Oil and Gas Engineering Service Co., Ltd. Address before: 225300 South Passage 99, Hailing District, Taizhou City, Jiangsu Province Patentee before: SINOPEC East China Branch Oil Production Plant |
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Effective date of registration: 20210913 Address after: 225300 South Passage 99, Hailing District, Taizhou City, Jiangsu Province Patentee after: TAIZHOU OIL PRODUCTION PLANT, CHINA PETROLEUM & CHEMICAL CORPORATION EAST CHINA OIL & GAS Co. Address before: 225300 Wuliqiao Trial Production Brigade Complex Building, Chengdong Street Development Zone, Hailing District, Taizhou City, Jiangsu Province Patentee before: Taizhou Youheng Oil and Gas Engineering Service Co.,Ltd. |
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