CN215927345U - Two-stage oxygen reduction air foam flooding ground injection device - Google Patents
Two-stage oxygen reduction air foam flooding ground injection device Download PDFInfo
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- CN215927345U CN215927345U CN202122134242.8U CN202122134242U CN215927345U CN 215927345 U CN215927345 U CN 215927345U CN 202122134242 U CN202122134242 U CN 202122134242U CN 215927345 U CN215927345 U CN 215927345U
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Abstract
The utility model relates to a two-stage oxygen reduction air foam flooding ground injection device which comprises an injection wellhead, wherein a casing and an oil pipe are sequentially arranged in the injection wellhead, and the oil pipe is positioned in the casing; the device also comprises an air deoxygenation system injected into the oil pipe and a water-injection deoxygenation system; the air deoxygenation system comprises an air source, an air compressor, a filter, a membrane separator and an oxygen content analyzer which are sequentially connected through an air injection pipeline, wherein a first emptying valve is arranged on the membrane separator; the injection water deoxygenation system comprises an injection water source, a water injection pump, a buffer tank, a liquid preparation tank and a dissolved oxygen analyzer which are sequentially connected through an injection water pipeline; and the injection water pipeline between the water injection pump and the liquid preparation tank is connected with a deoxidant adding pipeline. The utility model provides a good solution for the safety guarantee of the oil displacement process.
Description
Technical Field
The utility model belongs to the technical field of oil and gas field development and recovery ratio improvement, and relates to a two-stage oxygen reduction air foam flooding ground injection process device for an oil field.
Background
The air foam flooding organically combines air flooding and surfactant flooding and has multiple oil displacement mechanisms of air flooding, active water flooding and foam flooding. (1) The gas drive mechanism is as follows: the method comprises the gravity differentiation, oil gas gravity drainage and drive, and the maintenance and improvement of the formation pressure; the air can displace residual oil of the micro-cracks which cannot be reached by water waves; the low temperature oxidation of air with crude oil produces a flue gas that dissolves in the crude oil causing its volume to expand, squeezing a portion of the residual oil out of the retention space to form a recoverable oil, and enhancing recovery through displacement/extraction. (2) The foam flooding mechanism is as follows: the foam can block water and oil without blocking, and block large and small, and can preferentially block large channels and water flow dominant channels, thereby improving the oil displacement efficiency of low-permeability and high-oil-content small channels. (3) The active water flooding mechanism: the foaming agent is a surfactant with strong activity, can greatly reduce the oil-water interfacial tension, and improves the oil washing efficiency through oil-water emulsification, liquid film replacement and other modes. In conclusion, the air foam flooding can improve the sweep efficiency while improving the sweep efficiency, and is particularly suitable for medium and low permeability reservoirs.
Air as an injection medium of the air foam flooding is low in cost and wide in source, but the safety problem of the air foam flooding is always the focus of attention. Before air flooding or air foam flooding, a target oil reservoir is subjected to experiment and numerical simulation evaluation, the oxidation characteristic of crude oil in the oil reservoir is mainly researched, and the adaptability of the oil reservoir to air flooding is evaluated. If the air is not retained in the formation for a sufficient time to substantially deplete the air of oxygen from the low temperature oxidation reaction with the crude oil, there is a risk of explosion if the oxygen concentration in the well bore of the production well reaches the desired range for explosion (greater than 10-11%).
Aiming at the safety problem of air foam flooding, oxygen removal schemes such as deep cooling separation, pressure swing adsorption separation, membrane separation and the like are generally adopted, oxygen contained in air is removed on the ground before the air is injected into an oil reservoir, and oxygen-reduced air or N is removed2The reservoir is injected to ensure safety while ignoring dissolved oxygen that is carried into the reservoir by the injected water slug when the foam concentrate is formulated.
Disclosure of Invention
The utility model aims to solve the problems and provides a two-stage oxygen reduction air foam flooding ground injection device which utilizes a membrane separation physical method to remove oxygen from air and simultaneously utilizes an oxidation-reduction chemical method to remove oxygen from injected water.
The technical scheme of the utility model is as follows:
a two-stage oxygen reduction air foam flooding ground injection device comprises an injection wellhead, wherein a casing and an oil pipe are sequentially arranged in the injection wellhead, and the oil pipe is positioned in the casing; the device also comprises an air deoxygenation system injected into the oil pipe and a water-injection deoxygenation system;
the air deoxygenation system comprises an air source, an air compressor, a filter, a membrane separator and an oxygen content analyzer which are sequentially connected through an air injection pipeline, wherein a first emptying valve is arranged on the membrane separator;
the injection water deoxygenation system comprises an injection water source, a water injection pump, a buffer tank, a liquid preparation tank and a dissolved oxygen analyzer which are sequentially connected through an injection water pipeline; and the injection water pipeline between the water injection pump and the liquid preparation tank is connected with a deoxidant adding pipeline.
The membrane separator is characterized by also comprising a parallel pipeline, wherein one end of the parallel pipeline is connected with an air injection pipeline behind the air compressor, and the other end of the parallel pipeline is connected with an air injection pipeline behind the membrane separator; and the parallel pipelines are provided with electromagnetic valves, and the electromagnetic valves are provided with flow transmitters.
A stirrer is arranged in the liquid preparation tank, and the stirrer is provided with a motor; the bottom of the liquid preparation tank is provided with a second emptying valve.
The oxygen scavenger addition pipeline comprises an oxygen scavenger source and a metering pump.
And the air injection pipeline and the water injection pipeline are both provided with one-way valves.
The two wings of the oil pipe are provided with a first oil pipe valve and a second oil pipe valve, the oil pipe is internally provided with a production valve, the air deoxygenation system is connected with the second oil pipe valve, and the injected water deoxygenation system is connected with the first oil pipe valve.
And the top end of the oil pipe is also provided with a test valve.
And a first sleeve valve and a second sleeve valve are arranged on two wings of the sleeve.
The utility model has the technical effects that:
the membrane separation physical method is used for deoxidizing air, the oxidation reduction chemical method is used for deoxidizing injected water, the oxygen amount brought into an oil reservoir from the ground in the air foam flooding process is reduced to the maximum extent through two-stage deoxidization, and a good solution is provided for the safety guarantee of the oil flooding process.
Drawings
FIG. 1 is a schematic diagram of a two-stage oxygen-reduction air-foam flooding ground injection device according to the present invention.
Reference numerals: 1. injecting into a wellhead; 2. an air compressor; 3. a filter; 4. a membrane separator; 5. an oxygen analyzer; 6. an injection pump; 7. a buffer tank; 8. preparing a liquid tank; 9. a dissolved oxygen analyzer; 10. a metering pump; 11. a first vent valve; 12. a one-way valve; 13. a first tubing valve; 14. a second tubing valve; 15. producing a valve; 16. testing the valve; 17. a first sleeve valve; 18. a second sleeve valve; 19. an electromagnetic valve; 20. a flow transmitter; 21. a second vent valve.
Detailed Description
Embodiment 1 a two-stage oxygen reduction air foam flooding ground injection device, including an injection wellhead 1, wherein a casing and an oil pipe are sequentially inserted into the injection wellhead 1, and the oil pipe is located in the casing; the method is characterized in that: the device also comprises an air deoxygenation system injected into the oil pipe and a water-injection deoxygenation system; the air deoxygenation system comprises an air source, an air compressor 2, a filter 3, a membrane separator 4 and an oxygen content analyzer which are sequentially connected through an air injection pipeline, and a first emptying valve 11 is arranged on the membrane separator 4;
the injection water deoxygenation system comprises an injection water source, a water injection pump, a buffer tank 7, a liquid preparation tank 8 and a dissolved oxygen analyzer 9 which are sequentially connected through an injection water pipeline; and an oxygen scavenger adding pipeline is connected to an injection water pipeline between the water injection pump and the liquid preparation tank 8.
The specific implementation process of the embodiment is as follows:
air oxygen removal system: air from nature is injected into an oil pipe through an air compressor 2, a filter 3, a membrane separator 4 and an oxygen content analyzer in sequence; a first emptying valve 11 of the membrane separator 4 discharges oxygen-enriched gas, and an oxygen content analyzer detects whether the oxygen content in an air slug entering the injection wellhead 1 is in a safe range;
and (3) injecting water to remove oxygen: the injected water from the oil field water supply system passes through a water injection pump, and the injected water and the deoxidant provided by the deoxidant adding pipeline are fully mixed, contacted, mixed and deoxidated in the buffer tank 7; the injected water with most of the oxygen removed enters the liquid preparation tank 8 to prepare foam liquid, and then is injected into the oil pipe.
Example 2
On the basis of embodiment 1, the method further comprises the following steps: one end of the parallel pipeline is connected with an air injection pipeline behind the air compressor 2, and the other end of the parallel pipeline is connected with an air injection pipeline behind the membrane separator 4; the parallel pipeline is provided with an electromagnetic valve 19, and the electromagnetic valve 19 is provided with a flow transmitter 20 so as to adjust the oxygen content in the injected air slug.
Example 3
On the basis of embodiment 1, the method further comprises the following steps: a stirrer is arranged in the liquid preparation tank 8, and the stirrer is provided with a motor; the bottom of the liquid preparation tank 8 is provided with a second emptying valve 21 for discharging the sediment.
Example 4
On the basis of embodiment 1, the method further comprises the following steps: the oxygen scavenger adding pipeline comprises an oxygen scavenger source and a metering pump 10, and the oxygen scavenger is added into the injected water oxygen removal system through the metering pump 10 in an accurate concentration ratio.
Example 5
On the basis of embodiment 1, the method further comprises the following steps: and the air injection pipeline and the water injection pipeline are respectively provided with a one-way valve 12 to prevent backflow.
Example 6
On the basis of embodiment 1, the method further comprises the following steps: the two wings of the oil pipe are provided with a first oil pipe valve 13 and a second oil pipe valve 14, the oil pipe is internally provided with a production valve 15, an air deoxygenation system is connected with the second oil pipe valve 14 and used for injecting an air slug, and an injected water deoxygenation system is connected with the first oil pipe valve 13 and used for injecting a foam liquid slug.
The top end of the oil pipe is also provided with a test valve 16 for lowering a test instrument and a cable during underground operation. And two wings of the sleeve are provided with a first sleeve valve 17 and a second sleeve valve 18 for monitoring the annular pressure of the oil sleeve.
Detailed description of the preferred embodiments
Air (volume content, nitrogen: 78.09%, oxygen: 20.95%, rare gas: 0.932%, carbon dioxide: 0.034%, water vapor and impurities: 0.02%) in nature is pressurized by an air compressor 2 and enters a filter 3, water vapor and impurities are removed, the air enters a membrane separator 4 with a built-in polyimide membrane medium, and the concentration of nitrogen in the air at the outlet of the membrane separator 4 is more than 99%, and the concentration of oxygen is less than 1%. In consideration of economy, a certain proportion of air is mixed into the membrane separation outlet to reduce the nitrogen concentration to 90 percent, and the safety requirement can be met.
The flow rate of injected water from an oil field water supply system is 1m3/h, 40-60mg/l of sodium sulfite and 0.01-0.05mg/l of divalent cobalt ions are taken as an oxygen scavenger and are added into a water injection pipeline through a metering pump 10, and the concentration of dissolved oxygen in foam liquid entering an injection wellhead through a buffer tank 7 and a liquid preparation tank 8 is less than 0.05ppm and is far lower than the requirement of an oil field.
The devices involved in the present invention are all prior art. For example, the model of the air compressor 2 is GX40120, the model of the filter 3 is MPP6605, the model of the membrane separator 4 is DM-1000, the models of the first emptying valve 11 and the second emptying valve 21 are Z61H-800Lb, the model of the oxygen analyzer 5 is GPRo 500, the model of the check valve 12 is H44H-16P, the model of the flow transmitter 20 is WT2000-5E1S2T, the model of the electromagnetic valve 19 is ZC51-20HB, the water injection pump is an ISWH horizontal water injection pump, the model of the metering pump 10 is SJM2499/0.5 III, the model of the dissolved oxygen analyzer 9 is OHR-DO 10-0/0-2-D1-03A, and the models of the first oil pipe valve 13, the second oil pipe valve 14, the first sleeve valve 17, the second sleeve valve 18, the production valve 15 and the test valve 16 are DJ41Y-25 DJ Y-25.
Claims (8)
1. A two-stage oxygen reduction air foam flooding ground injection device comprises an injection wellhead (1), wherein a casing and an oil pipe are sequentially arranged in the injection wellhead (1), and the oil pipe is positioned in the casing; the method is characterized in that: the device also comprises an air deoxygenation system injected into the oil pipe and a water-injection deoxygenation system;
the air deoxygenation system comprises an air source, an air compressor (2), a filter (3), a membrane separator (4) and an oxygen content analyzer which are sequentially connected through an air injection pipeline, wherein a first emptying valve (11) is arranged on the membrane separator (4);
the injection water deoxygenation system comprises an injection water source, a water injection pump, a buffer tank (7), a liquid preparation tank (8) and a dissolved oxygen analyzer (9) which are sequentially connected through an injection water pipeline; and an oxygen scavenger adding pipeline is connected on an injection water pipeline between the water injection pump and the liquid preparation tank (8).
2. The dual stage oxygen reduction air foam flooding ground injection device of claim 1, wherein: one end of the parallel pipeline is connected with the back of the air compressor (2), and the other end of the parallel pipeline is connected with the air injection pipeline behind the membrane separator (4); and the parallel pipeline is provided with an electromagnetic valve (19), and the electromagnetic valve (19) is provided with a flow transmitter (20).
3. The dual stage oxygen reduction air foam flooding ground injection device of claim 2, wherein: a stirrer is arranged in the liquid preparation tank (8), and the stirrer is provided with a motor; the bottom of the liquid distribution tank (8) is provided with a second emptying valve (21).
4. The dual stage oxygen reduction air foam flooding ground injection device of claim 3, wherein: the oxygen scavenger addition pipeline comprises an oxygen scavenger source and a metering pump (10).
5. The dual stage oxygen reduction air foam flooding ground injection device of claim 4, wherein: and the air injection pipeline and the water injection pipeline are both provided with one-way valves (12).
6. The dual stage oxygen reduction air foam flooding ground injection device of claim 5, wherein: two wings of the oil pipe are provided with a first oil pipe valve (13) and a second oil pipe valve (14), a production valve (15) is arranged in the oil pipe, the air deoxygenation system is connected with the second oil pipe valve (14), and the injected water deoxygenation system is connected with the first oil pipe valve (13).
7. The dual stage oxygen reduction air foam flooding ground injection device of claim 6, wherein: the top end of the oil pipe is also provided with a test valve (16).
8. The dual stage oxygen reduction air foam flooding ground injection device of claim 7, wherein: two wings of the sleeve are provided with a first sleeve valve (17) and a second sleeve valve (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122134242.8U CN215927345U (en) | 2021-09-06 | 2021-09-06 | Two-stage oxygen reduction air foam flooding ground injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122134242.8U CN215927345U (en) | 2021-09-06 | 2021-09-06 | Two-stage oxygen reduction air foam flooding ground injection device |
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| Publication Number | Publication Date |
|---|---|
| CN215927345U true CN215927345U (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122134242.8U Expired - Fee Related CN215927345U (en) | 2021-09-06 | 2021-09-06 | Two-stage oxygen reduction air foam flooding ground injection device |
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| CN (1) | CN215927345U (en) |
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2021
- 2021-09-06 CN CN202122134242.8U patent/CN215927345U/en not_active Expired - Fee Related
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Granted publication date: 20220301 |