CN114059992A - Carbon dioxide injection huff and puff oil extraction ground device for oil field - Google Patents
Carbon dioxide injection huff and puff oil extraction ground device for oil field Download PDFInfo
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- CN114059992A CN114059992A CN202111253283.7A CN202111253283A CN114059992A CN 114059992 A CN114059992 A CN 114059992A CN 202111253283 A CN202111253283 A CN 202111253283A CN 114059992 A CN114059992 A CN 114059992A
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- oil
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 340
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 170
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 170
- 238000002347 injection Methods 0.000 title claims abstract description 64
- 239000007924 injection Substances 0.000 title claims abstract description 64
- 238000000605 extraction Methods 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 101
- 238000000926 separation method Methods 0.000 claims abstract description 70
- 238000011084 recovery Methods 0.000 claims abstract description 60
- 239000012535 impurity Substances 0.000 claims abstract description 32
- 238000003860 storage Methods 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000013049 sediment Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 abstract description 33
- 239000005431 greenhouse gas Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 67
- 239000010779 crude oil Substances 0.000 description 37
- 239000007787 solid Substances 0.000 description 22
- 238000007599 discharging Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 4
- 239000003818 cinder Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/34—Arrangements for separating materials produced by the well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids
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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 provides a carbon dioxide injection huff and puff oil extraction ground device for an oil field, which comprises a carbon dioxide injection system, an oil extraction system and a carbon dioxide recovery system, wherein the carbon dioxide injection system comprises a carbon dioxide storage tank and an injection pressure pump, one end of the injection pressure pump is communicated with the carbon dioxide storage tank, and the other end of the injection pressure pump is communicated with an oil extraction wellhead; the oil extraction system comprises an oil extraction pump, a multi-stage deslagging tank, a liquid-liquid separation tank and a gas-liquid separation tank which are sequentially connected with the oil extraction pump, wherein a liquid carbon dioxide flow passage is communicated with the liquid-liquid separation tank, and a gaseous carbon dioxide flow passage is communicated with the gas-liquid separation tank; the carbon dioxide recovery system comprises a gas impurity removal tank, wherein the inlet end of the gas impurity removal tank is communicated with a liquid carbon dioxide flow channel and a gaseous carbon dioxide flow channel, the outlet end of the gas impurity removal tank is communicated with a compressor, and the outlet end of the compressor is communicated with a carbon dioxide storage tank. The invention can recycle pure carbon dioxide, improve the utilization efficiency of the carbon dioxide and reduce the generation of greenhouse gases.
Description
Technical Field
The invention belongs to the technical field of oil extraction equipment, and particularly provides a carbon dioxide injection huff and puff oil extraction ground device for an oil field.
Background
The oil field carbon dioxide injection huff and puff oil extraction technology is characterized in that a certain amount of carbon dioxide is injected into reservoir crude oil, and a well is closed for a period of time, so that the crude oil and the carbon dioxide are fully mixed, the volume of the crude oil is expanded, the viscosity of the crude oil is reduced, the flow characteristic of the crude oil is improved, the oil field carbon dioxide injection huff and puff oil extraction technology has a remarkable effect on reducing the water content of an oil reservoir in an ultrahigh water-containing stage in the later period of exploitation, and is one of effective methods for improving the final recovery efficiency of the crude oil.
However, the existing oil field carbon dioxide injection huff and puff oil recovery technology is usually directly discharged into the atmosphere after open injection in the crude oil recovery stage, so that the generation of greenhouse gases in the oil recovery process is greatly increased, and the targets of carbon dioxide capture, utilization and sequestration are difficult to realize.
In addition, the existing carbon dioxide injection huff and puff oil recovery technology for some oil fields is provided with a carbon dioxide collecting device, but after carbon dioxide is sprayed out from the underground, a large amount of other gases are carried, so that the purity of the collected carbon dioxide is reduced, after multiple cycles of circulation, the mixing effect of the carbon dioxide injected into the well and crude oil is reduced, and the final recovery rate of the crude oil is influenced.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem that the existing carbon dioxide injection huff-and-puff oil extraction technology in the oil field cannot recover carbon dioxide with higher purity, the invention provides a carbon dioxide injection huff-and-puff oil extraction ground device in the oil field, which comprises a carbon dioxide injection system, an oil extraction system and a carbon dioxide recovery system.
The carbon dioxide injection system comprises a carbon dioxide storage tank and an injection pressure pump, one end of the injection pressure pump is communicated with the carbon dioxide storage tank, and the other end of the injection pressure pump is communicated with an injection end of the oil production wellhead;
the oil extraction system comprises an oil extraction pump extending into the oil extraction well mouth, and a multi-stage deslagging tank, a liquid-liquid separation tank and a gas-liquid separation tank which are sequentially connected with the outlet end of the oil extraction pump, wherein the liquid-liquid separation tank is communicated with a liquid carbon dioxide flow passage, and the gas-liquid separation tank is communicated with a gaseous carbon dioxide flow passage;
the carbon dioxide recovery system comprises a gas impurity removal tank, wherein the inlet end of the gas impurity removal tank is communicated with the liquid carbon dioxide flow channel and the gaseous carbon dioxide flow channel, the outlet end of the gas impurity removal tank is communicated with a compressor, and the outlet end of the compressor is communicated with the carbon dioxide storage tank.
As a preferred implementation manner, a temperature adjusting device is arranged on a pipeline between the carbon dioxide storage tank and the injection pressure pump, and the temperature adjusting device can cool the pipeline.
In a preferred implementation, a one-way valve is arranged on a pipeline between the injection pressure pump and the injection end of the oil production wellhead.
As a preferred implementation mode, a plurality of layers of filter screens are arranged inside the multistage deslagging tank, every two adjacent layers of filter screens are arranged between the filter screens, the filter precision of the filter screens at the inlet end of the multistage deslagging tank is far away from the filter precision of the filter screens close to the inlet end of the multistage deslagging tank.
As a preferred implementation mode, the filter screen is in a funnel shape with a low middle part and a high periphery, the lowest part of the filter screen is provided with a slag discharge pipe, and the slag discharge pipe penetrates out of the multi-stage slag removal tank to form a slag discharge hole;
every adjacent two-layer the filter screen arrange the form that the sediment pipe set up to overlapping and establish step by step, and be close to the multistage slagging tank entry end the filter screen arrange the sediment pipe and be located the inboard, keep away from the multistage slagging tank entry end the filter screen arrange the sediment pipe and be located the outside.
As a preferred implementation manner, the filter screen is a curved plate with a C-shaped cross section, the opening of the filter screen faces upwards and is arranged in the multistage deslagging tank from high to low in an inclined manner, and the filter screens are parallel to each other.
As a preferred implementation manner, the lowest position where the side wall of the multistage deslagging tank is connected with each filter screen is provided with a deslagging hole.
As a preferred implementation manner, the slag discharge hole of the multi-stage slag removal tank is communicated with a secondary recovery tank.
In a preferred implementation manner, a heating device is disposed on the periphery of the gas-liquid separation tank, and the heating device is used for heating the gas-liquid separation tank to gasify carbon dioxide in the gas-liquid separation tank.
In a preferred implementation manner, a heating device is arranged at the periphery of the gas impurity removal tank, and the heating device is used for gasifying the liquid carbon dioxide in the gas impurity removal tank.
It can be understood by those skilled in the art that the aforementioned carbon dioxide injection stimulation oil recovery surface device for the oil field of the present invention has at least the following beneficial effects:
1. through set up the multistage sediment jar that removes, liquid-liquid separation jar and the gas-liquid separation jar that connect gradually with the exit end of oil recovery pump in oil recovery system for multistage sediment jar that removes can carry out multistage filtration to the crude oil of oil recovery pump production, in order to detach the solid particle of mixing in the crude oil, makes things convenient for follow-up carbon dioxide of following-up separation from the crude oil. Through being provided with liquid-liquid separation jar behind multistage slagging scorification jar for liquid-liquid separation jar can carry out the primary separation to crude oil and still be in liquid carbon dioxide, alleviates follow-up gas-liquid separation jar separation gaseous state carbon dioxide's operating pressure, and improves carbon dioxide's separation efficiency. Through be provided with the knockout drum behind the liquid-liquid separation jar for the knockout drum can be followed and is separated gaseous carbon dioxide in the crude oil, has improved the rate of recovery of carbon dioxide.
Further, through set up gaseous edulcoration jar in carbon dioxide recovery system, and be linked together the entrance point and liquid carbon dioxide runner and gaseous carbon dioxide runner with gaseous edulcoration jar, make liquid carbon dioxide in the liquid-liquid knockout drum and gaseous carbon dioxide in the gaseous knockout drum can enter into among the gaseous edulcoration jar, other impure gas in the carbon dioxide can be got rid of to gaseous edulcoration jar, in order to purify the carbon dioxide of retrieving, maintain the purity of the carbon dioxide of annotating back the carbon dioxide storage tank, and then guarantee the oil recovery effect of the oil field carbon dioxide oil recovery ground installation of huff and puff.
2. Through being provided with attemperator on the pipeline between carbon dioxide storage tank and the injection pressure pump for attemperator can cool down the processing to the pipeline, avoids flowing through the liquid carbon dioxide of pipeline to be heated the gasification and lead to the inside pressure increase of pipeline, reduces the risk that takes place the pipeline damage. And the temperature regulating device can maintain the carbon dioxide in the pipeline in a liquid state, and is convenient to regulate the pressure when the carbon dioxide is injected into the oil production well mouth.
Further, through set up the check valve between the injection end of injection pressure pump and oil recovery well head, can guarantee that liquid carbon dioxide can one-way injection to the oil recovery well mouth in, avoid appearing the great phenomenon that leads to liquid carbon dioxide backward flow of oil recovery well mouth department pressure and take place.
3. The filter screen is arranged in the multistage deslagging tank, the filter precision of the filter screen which is arranged between every two adjacent layers of filter screens and is far away from the inlet end of the multistage deslagging tank is higher than the filter precision of the filter screen which is close to the inlet end of the multistage deslagging tank, crude oil is made to enter the multistage deslagging tank and then can be filtered step by step, the filter screen which is close to the inlet end of the multistage deslagging tank can remove solid dregs with large volume, the filter screen which is far away from the inlet end of the multistage deslagging tank can remove the solid dregs with gradually reduced volume in sequence, the phenomenon that the filter screen is blocked to cause the reduction of the filter capacity of the filter screen is avoided on the premise that the crude oil can normally pass through the multistage deslagging tank.
4. Be provided with the secondary through the slag hole department that removes the sediment jar at multistage for the secondary is retrieved the jar and can be collected by multistage sediment jar the solid dregs of exhaust intermixing with crude oil, and the secondary is retrieved the jar and can be carried out secondary filter to the solid dregs that has intermixed with crude oil, is used for collecting the crude oil that adheres to on the solid dregs, has promoted the recovery ratio of crude oil.
5. The heating device is arranged on the periphery of the gas-liquid separation tank, so that the heating device can heat the gas-liquid separation tank to gasify liquid carbon dioxide flowing into the gas-liquid separation tank, only gaseous carbon dioxide exists in the gas-liquid separation tank, and the carbon dioxide is conveniently discharged. Further, by heating the gas-liquid separation tank, the movement of gas in the gas-liquid separation tank can be promoted, and the discharge of carbon dioxide can be accelerated.
Further, be provided with heating device through the periphery at gaseous edulcoration jar for heating device can gasify the liquid carbon dioxide who gets into from the liquid-liquid knockout drum, makes only have gas in the gaseous edulcoration jar, conveniently gets rid of impurity gas to the gaseous edulcoration jar, is favorable to improving carbon dioxide's purity.
Drawings
Some embodiments of the invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the overall structure of an oil field carbon dioxide injection huff-puff oil recovery surface device according to the invention;
FIG. 2 is a schematic diagram of the internal structure of a multi-stage deslagging tank in the first embodiment of the invention;
FIG. 3 is a first schematic view of the internal structure of a multi-stage deslagging tank in a second embodiment of the invention;
FIG. 4 is a second schematic view of the internal structure of the multi-stage deslagging tank in the second embodiment of the invention.
List of reference numerals:
1-a carbon dioxide injection system; 11-a carbon dioxide storage tank; 12-injection pressure pump; 13-a temperature regulating device; 14-a one-way valve; 2-an oil recovery system; 21-an oil extraction pump; 22-a multi-stage deslagging tank; 221-a filter screen; 222-a slag discharge pipe; 223-slag discharge holes; 23-liquid separation tank; 231-liquid carbon dioxide flow path; 24-a gas-liquid separation tank; 241-a gaseous carbon dioxide flow channel; 25-a secondary recovery tank; 26-an oil storage tank; 27-a heating device; 3-a carbon dioxide recovery system; 31-a gas impurity removal tank; 32-a compressor; 4-oil extraction well head.
Detailed Description
It should be understood by those skilled in the art that the embodiments described below are only a partial embodiment of the present invention, which is intended to explain the technical principles of the present invention and not to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments provided by the present invention without inventive effort, shall still fall within the scope of protection of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, an oil field carbon dioxide injection huff and puff oil recovery surface device provided by an embodiment of the present invention includes a carbon dioxide injection system 1, an oil recovery system 2, and a carbon dioxide recovery system 3. The carbon dioxide injection system 1 includes a carbon dioxide storage tank 11 and an injection pressure pump 12, and the carbon dioxide storage tank 11 is communicated with one end of the injection pressure pump 12 through a pipeline. The carbon dioxide storage tank 11 is used for storing liquid carbon dioxide, the liquid carbon dioxide in the carbon dioxide storage tank 11 can flow to the injection pressure pump 12 through a pipeline, and the other end of the injection pressure pump 12 is communicated with the injection end of the oil production wellhead 4, so that the liquid carbon dioxide can be injected into the oil production well.
With reference to fig. 1, the oil recovery system 2 includes an oil recovery pump 21 extending into the oil recovery wellhead 4, an outlet end of the oil recovery pump 21 is sequentially connected with a multistage deslagging tank 22, a liquid-liquid separation tank 23 and a gas-liquid separation tank 24, wherein the liquid-liquid separation tank 23 is communicated with a liquid carbon dioxide flow channel 231, and the gas-liquid separation tank 24 is communicated with a gaseous carbon dioxide flow channel 241. The crude oil extracted by the oil extraction pump 21 firstly enters a multistage deslagging tank 22 to remove solid impurities, then the crude oil mixed with carbon dioxide enters a liquid-liquid separation tank 23 to be subjected to liquid carbon dioxide separation, and then the crude oil flows into a gas-liquid separation tank 24 to be subjected to gaseous carbon dioxide separation. An oil outlet is arranged on the gas-liquid separation tank 24, and the crude oil passing through the gas-liquid separation tank 24 is discharged through the oil outlet and collected in the oil storage tank 26.
With reference to fig. 1, the carbon dioxide recovery system 3 includes a gas impurity removal tank 31, and an inlet of the gas impurity removal tank 31 is respectively communicated with the liquid carbon dioxide flow channel 231 and the gaseous carbon dioxide flow channel 241, so that the liquid carbon dioxide separated from the liquid-liquid separation tank 23 can enter the gas impurity removal tank 31 through the liquid carbon dioxide flow channel 231, and the gaseous carbon dioxide separated from the gas-liquid separation tank 24 can enter the gas impurity removal tank 31 through the gaseous carbon dioxide flow channel 241. Finally, the carbon dioxide purified by the gas removal tank 31 is compressed into liquid carbon dioxide by a compressor 32 and injected back into the carbon dioxide storage tank 11.
As will be understood by those skilled in the art, the multistage deslagging tank 22, the liquid-liquid separation tank 23 and the gas-liquid separation tank 24, which are sequentially connected to the outlet end of the oil production pump 21, are disposed in the oil production system 2, so that the crude oil produced by the oil production pump 21 can be subjected to multistage filtration by the multistage deslagging tank 22 to remove solid particles mixed in the crude oil, thereby facilitating subsequent separation of carbon dioxide from the crude oil. Through being provided with liquid-liquid separation jar 23 behind multistage slagging constituent jar 22 for liquid-liquid separation jar 23 can carry out primary separation to crude oil and still be in liquid carbon dioxide, alleviates follow-up gas-liquid separation jar 24 and separates the operating pressure of gaseous carbon dioxide, and improves the separation efficiency of carbon dioxide. By providing the gas-liquid separation tank 24 after the liquid-liquid separation tank 23, the gas-liquid separation tank 24 can separate gaseous carbon dioxide from crude oil, and the recovery rate of carbon dioxide is improved.
Further, through set up gaseous edulcoration jar 31 in carbon dioxide recovery system 3, and be linked together gaseous edulcoration jar 31's entrance point and liquid carbon dioxide runner 231 and gaseous carbon dioxide runner 241, make among the gaseous carbon dioxide in the liquid-liquid separation jar 23 and the gaseous carbon dioxide in the gas-liquid separation jar 24 can enter into gaseous edulcoration jar 31, other gaseous impurities in the carbon dioxide can be got rid of to gaseous edulcoration jar 31, in order to purify the carbon dioxide of retrieving, maintain the purity of the carbon dioxide of injecting back carbon dioxide storage tank 11, and then guarantee the oil recovery effect that the oil field is injected carbon dioxide and is taken in and send out oil recovery ground device.
As shown in fig. 1, a temperature control device 13 is provided on a pipeline between the carbon dioxide storage tank 11 and the injection pressure pump 12, and the temperature control device 13 can perform a temperature reduction process on the pipeline.
As can be understood by those skilled in the art, the temperature adjusting device 13 is arranged on the pipeline between the carbon dioxide storage tank 11 and the injection pressure pump 12, so that the temperature adjusting device 13 can cool the pipeline, the increase of the internal pressure of the pipeline caused by the heating and gasification of the liquid carbon dioxide flowing through the pipeline is avoided, and the risk of pipeline damage is reduced. Moreover, the temperature adjusting device 13 can maintain the carbon dioxide in the pipeline in a liquid state, and is convenient for pressure adjustment when being injected into the oil extraction wellhead 4.
With continued reference to fig. 1, a one-way valve 14 is provided in the tubing between the injection pressure pump 12 and the injection end of the production wellhead 4.
As can be understood by those skilled in the art, by arranging the check valve 14 between the injection pressure pump 12 and the injection end of the oil recovery wellhead 4, the liquid carbon dioxide can be ensured to be injected into the oil recovery wellhead 4 in a one-way manner, and the phenomenon that the liquid carbon dioxide flows back due to the large pressure at the oil recovery wellhead 4 is avoided.
As shown in fig. 1, a plurality of layers of filter screens 221 are disposed inside the multi-stage slag removing tank 22, and between every two adjacent layers of filter screens 221, the filter precision of the filter screen 221 far away from the inlet end of the multi-stage slag removing tank 22 is higher than that of the filter screen 221 near the inlet end of the multi-stage slag removing tank 22.
Those skilled in the art can understand that, by providing a plurality of layers of filter screens 221 in the multi-stage deslagging tank 22, and setting the filter precision of the filter screen 221 far away from the inlet end of the multi-stage deslagging tank 22 between every two adjacent layers of filter screens 221 to be higher than the filter precision of the filter screen 221 near the inlet end of the multi-stage deslagging tank 22, after crude oil enters the multi-stage deslagging tank 22, the filter screen 221 can filter the crude oil step by step, the filter screen 221 near the inlet end of the multi-stage deslagging tank 22 can remove solid dregs with larger volume, the filter screen 221 far away from the inlet end of the multi-stage deslagging tank 22 can sequentially remove solid dregs with gradually reduced volume, on the premise of ensuring that the crude oil can normally pass through the multi-stage deslagging tank 22, the phenomenon that the filter screen 221 is blocked to cause the reduction of the filter capacity of the filter screen 221 is avoided.
It should be noted that the form of the multistage deslagging tank 22 is not specifically limited in the present invention, and any one of the following embodiments may be adopted:
example 1: as shown in fig. 2, the filter screen 221 in the multi-stage slag removing tank 22 in this embodiment is a funnel shape with a low middle and a high periphery, the lowest part of the filter screen 221 is provided with a slag discharging pipe 222, and the slag discharging pipe 222 penetrates through the multi-stage slag removing tank 22 to form a slag discharging hole 223;
the slag discharge pipe 222 of each two adjacent layers of filter screens 221 is arranged in a mode of being sleeved step by step, the slag discharge pipe 222 of the filter screen 221 close to the inlet end of the multi-stage slag removing tank 22 is positioned at the inner side, and the slag discharge pipe 222 of the filter screen 221 far away from the inlet end of the multi-stage slag removing tank 22 is positioned at the outer side.
By providing the multistage dross removal tank 22 in the above-described manner, the multistage dross removal tank 22 can realize a filtration form of the staged filtration, in which solid dross having a large volume is stopped by the filter screen 221 near the inlet end of the multistage dross removal tank 22, and solid dross having a small volume is stopped by the filter screen 221 far from the inlet end of the multistage dross removal tank 22.
Further, the slag discharging pipe 222 of the filter screens 221 is set to be in a form of nesting step by step, on the premise that the slag discharging pipe 222 can smoothly discharge slag, the number of the holes of the slag discharging pipe 222 on the multistage slag removing tank 22 can be reduced, namely, the slag discharging requirement of all the filter screens 221 can be met only by arranging one through hole on the side wall of the multistage slag removing tank 22, the tank body strength of the multistage slag removing tank 22 is guaranteed, and the filter screens are not prone to damage.
Example 2: as shown in fig. 3 and 4, the filter screens 221 of the multi-stage slag removing pot 22 in this embodiment are configured as curved plates with C-shaped cross sections, the openings of the filter screens 221 face upward and are arranged in the multi-stage slag removing pot 22 from high to low, and a plurality of filter screens 221 are parallel to each other.
The filter screen 221 is set in a form of a C-shaped curved plate, and the openings of the multiple filter screens face the upper side, so that the filter screen 221 can receive crude oil flowing from the inlet end of the multistage deslagging tank 22, and solid slag filtered by the filter screen 221 is collected at the bottom end of the filter screen 221; through setting up filter screen 221 into the form that sets up by high to low slope for the solid dregs that stop on filter screen 221 can move down along filter screen 221 under the effect of self gravity, avoids solid dregs to influence the filter effect of filter screen 221.
Further, a slag discharge hole 223 is formed at the lowest position where the side wall of the multistage deslagging tank 22 is connected with each filter screen 221. Through setting up row's cinder hole 223 for the solid dregs of collecting on filter screen 221 can discharge in the inside of multistage slagging-off jar 22 through row's cinder hole 223, avoids solid dregs to be detained and influences the filter effect of filter screen 221 on filter screen 221.
As a preferred implementation manner of the embodiment 1 and the embodiment 2, the slag discharge hole 223 of the multi-stage slag removing tank 22 is communicated with the secondary recovery tank 25.
As can be understood by those skilled in the art, by providing the secondary recovery tank 25 at the slag discharge hole 223 of the multistage deslagging tank 22 so that the secondary recovery tank 25 can collect the discharged solid slag mixed with crude oil by the multistage deslagging tank 22, the secondary recovery tank 25 can secondarily filter the solid slag mixed with crude oil to collect the crude oil attached to the solid slag, thereby improving the recovery ratio of the crude oil.
As shown in fig. 1, a heating device 27 is provided on the periphery of the gas-liquid separation tank 24, and the heating device 27 is used to heat the gas-liquid separation tank 24 to gasify carbon dioxide in the gas-liquid separation tank 24.
As will be understood by those skilled in the art, the heating device 27 is provided on the periphery of the gas-liquid separation tank 24, so that the heating device 27 can heat the gas-liquid separation tank 24 to gasify the liquid carbon dioxide flowing into the gas-liquid separation tank 24, so that only gaseous carbon dioxide exists in the gas-liquid separation tank 24, thereby facilitating the discharge of carbon dioxide. Further, by heating the gas-liquid separation tank 24, the movement of the gas in the gas-liquid separation tank 24 can be promoted, and the discharge of carbon dioxide can be accelerated.
As shown in FIG. 1, a heating device 27 is also disposed at the periphery of the gas impurity removal tank 31, and the heating device 27 is used for gasifying the liquid carbon dioxide in the gas impurity removal tank 31.
Those skilled in the art can understand that, through being provided with heating device 27 in the periphery of gaseous edulcoration jar 31 for heating device 27 can gasify the liquid carbon dioxide who gets into from liquid-liquid knockout drum 23, makes only have gas in the gaseous edulcoration jar 31, conveniently gets rid of impurity gas to gaseous edulcoration jar 31, is favorable to improving the purity of carbon dioxide.
It should be noted that the gas impurity removal tank 31 may adopt any of various possible embodiments to purify carbon dioxide, for example, by adding a solid reactant into the gas impurity removal tank 31 so that the solid reactant can react with the impurity gas in the gas impurity removal tank 31 to remove the impurity gas from the carbon dioxide gas; or, gaseous edulcoration jar 31 can also adopt the form of cooling down step by step, and at the in-process that the temperature reduces step by step, the impurity gas that liquefaction temperature is less than carbon dioxide can be discharged by one-step liquefaction earlier, can purify the carbon dioxide in the gaseous edulcoration jar 31.
As shown in FIG. 1, the outlet end of the gas impurity removal tank 31 is connected with a compressor 32, and the outlet end of the compressor 32 is communicated with the carbon dioxide storage tank 11. The compressor 32 can compress the high-purity carbon dioxide discharged from the gas impurity removal tank 31, so that the gaseous carbon dioxide is compressed again into liquid carbon dioxide, and the carbon dioxide can conveniently flow into and be stored in the carbon dioxide storage tank 11.
So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without departing from the technical principle of the present invention, a person skilled in the art may split and combine the technical solutions in the above embodiments, and may make equivalent changes or substitutions for related technical features, and any changes, equivalents, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.
Claims (10)
1. An oil field carbon dioxide injection huff and puff oil extraction ground device comprises a carbon dioxide injection system, an oil extraction system and a carbon dioxide recovery system, and is characterized in that,
the carbon dioxide injection system comprises a carbon dioxide storage tank and an injection pressure pump, one end of the injection pressure pump is communicated with the carbon dioxide storage tank, and the other end of the injection pressure pump is communicated with an injection end of the oil production wellhead;
the oil extraction system comprises an oil extraction pump extending into the oil extraction well mouth, and a multi-stage deslagging tank, a liquid-liquid separation tank and a gas-liquid separation tank which are sequentially connected with the outlet end of the oil extraction pump, wherein the liquid-liquid separation tank is communicated with a liquid carbon dioxide flow passage, and the gas-liquid separation tank is communicated with a gaseous carbon dioxide flow passage;
the carbon dioxide recovery system comprises a gas impurity removal tank, wherein the inlet end of the gas impurity removal tank is communicated with the liquid carbon dioxide flow channel and the gaseous carbon dioxide flow channel, the outlet end of the gas impurity removal tank is communicated with a compressor, and the outlet end of the compressor is communicated with the carbon dioxide storage tank.
2. The oilfield carbon dioxide injection huff and puff oil recovery ground device according to claim 1, wherein a temperature adjusting device is arranged on a pipeline between the carbon dioxide storage tank and the injection pressure pump, and the temperature adjusting device can cool the pipeline.
3. The carbon dioxide huff and puff oil recovery ground device for the oil field as claimed in claim 2, wherein a one-way valve is arranged on a pipeline between the injection pressure pump and the injection end of the oil recovery wellhead.
4. The oil field carbon dioxide injection huff and puff oil recovery ground device according to claim 1, wherein a plurality of layers of filter screens are arranged inside the multistage deslagging tank, and between every two adjacent layers of filter screens, the filter screen far away from the inlet end of the multistage deslagging tank has a higher filter precision than the filter screen close to the inlet end of the multistage deslagging tank.
5. The oilfield carbon dioxide injection huff and puff oil recovery ground device according to claim 4, wherein the filter screen is a funnel shape with a low middle part and a high periphery, the lowest part of the filter screen is provided with a slag discharge pipe, and the slag discharge pipe penetrates out of the multi-stage slag removal tank to form a slag discharge hole;
every adjacent two-layer the filter screen arrange the form that the sediment pipe set up to overlapping and establish step by step, and be close to the multistage slagging tank entry end the filter screen arrange the sediment pipe and be located the inboard, keep away from the multistage slagging tank entry end the filter screen arrange the sediment pipe and be located the outside.
6. The oilfield carbon dioxide injection huff and puff oil recovery ground device of claim 4, wherein the filter screen is a curved plate with a C-shaped cross section, the opening of the filter screen faces upwards and is arranged in the multistage deslagging tank from high to low in an inclined manner, and a plurality of the filter screens are parallel to each other.
7. The oilfield carbon dioxide injection huff and puff oil recovery ground device of claim 6, wherein a slag discharge hole is formed at the lowest position where the side wall of the multistage deslagging tank is connected with each filter screen.
8. The oilfield carbon dioxide injection huff and puff oil recovery ground device according to claim 5 or 7, wherein the deslagging hole of the multistage deslagging tank is communicated with a secondary recovery tank.
9. The carbon dioxide huff and puff oil recovery ground device for the oil field as claimed in claim 1, wherein a heating device is arranged at the periphery of the gas-liquid separation tank, and the heating device is used for heating the gas-liquid separation tank to gasify the carbon dioxide in the gas-liquid separation tank.
10. The carbon dioxide injection huff and puff oil recovery ground device for the oil field as claimed in claim 1, wherein a heating device is arranged at the periphery of the gas impurity removal tank, and the heating device is used for gasifying the liquid carbon dioxide in the gas impurity removal tank.
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| CN104857811A (en) * | 2015-05-06 | 2015-08-26 | 中石化石油工程设计有限公司 | Oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system |
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| CN211692422U (en) * | 2020-03-02 | 2020-10-16 | 陕西延长石油(集团)有限责任公司研究院 | Carbon dioxide injection huff and puff oil extraction ground device for oil field |
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- 2021-10-27 CN CN202111253283.7A patent/CN114059992B/en active Active
Patent Citations (4)
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| WO2016075400A1 (en) * | 2014-11-14 | 2016-05-19 | Engie | Method and system for treating and separating a non-conventional gas |
| CN104857811A (en) * | 2015-05-06 | 2015-08-26 | 中石化石油工程设计有限公司 | Oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system |
| CN106761659A (en) * | 2016-12-15 | 2017-05-31 | 中国石油大学(华东) | One kind is used for oil field CO2Drive the purifying and liquefying technique of output gas re-injection |
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