CN117211743B - CO 2 Automatic circulation trapping and reinjection skid-mounted device and method for produced gas in oil displacement and storage process - Google Patents
CO 2 Automatic circulation trapping and reinjection skid-mounted device and method for produced gas in oil displacement and storage process Download PDFInfo
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Abstract
The invention belongs to the technical field of gas-driven oil extraction, and discloses CO 2 The device utilizes a gas-liquid-solid separation system, a multi-stage compression system, a gas identification system and a gas treatment system to realize automatic treatment and utilization of produced gas in different production rounds. The mixed fluid is separated and then subjected to gas content identification, and three treatment measures are adopted by different non-condensing gas contents: the method has the advantages that the method directly reinjects and feeds the raw materials to form aerosol and oxygen-doped combustion, and further eliminates adverse effects of the non-pure carbon dioxide, improves the oil gas action effect, realizes self-circulation trapping and burying of greenhouse gases, and strengthens an oil displacement-carbon burying-economy three-in-one operation mode while recycling. The invention realizes the staged treatment of the carbon dioxide produced gas, realizes the automatic recovery and reinjection of the produced gas, and is suitable for complex working condition environments such as mountain, desert, offshore operation platform and the like.
Description
Technical Field
The invention belongs to the technical field of gas-driven oil extraction, and particularly relates to CO 2 Produced gas self-circulation trapping and reinjection skid-mounted device and method in oil displacement and storage process.
Background
CO injection 2 Is a high-efficiency gas-driven oil extraction method, CO 2 Will become the main air source for each large oil field in the future. CO 2 EOR has two main mechanisms, one, CO 2 Has good swelling capacity to crude oil, and can be dispersed in the form of small bubbles after being fully contacted with the crude oilIn the oil phase, the crude oil is expanded, so that the elasticity of the crude oil is improved, and the recovery ratio is improved. 2. When CO 2 CO after the pressure is more than 7.39MPa and the temperature is more than 31.3 DEG C 2 Entering a supercritical state, the gas phase density is greatly improved, the liquid phase characteristic is provided, the extraction capacity to light components in crude oil is stronger, the interfacial tension of two phases can be greatly reduced, and the recovery ratio of crude oil is greatly improved.
CO 2 Oil-driving sealing is a research direction which is paid attention to at present, but the application of oil-driving sealing in mining fields in China is not widely popularized, and the main reason is that CO 2 Capture transport and CO 2 The associated gas treatment costs are relatively high. Due to the complex composition of associated gas of a production well and the large component difference of different production rounds, CO is caused 2 The associated gas treatment difficulty is high, the equipment requirement is relatively high, and if the concentrated recovery treatment is not carried out, CH in the oil well associated gas is not recovered 4 The environment will be destroyed, and the global warming effect will be aggravated.
Expert scholars are presented to put CO 2 The produced gas of (2) is reinjected, and the oil displacement, carbon sequestration and economy three-in-one effect is achieved after multiple circulation, however, the CO is realized from the site construction 2 The gas reinjection effect is not good, mainly due to CO 2 CH in associated gas 4 Excessive content affects supercritical CO 2 The liquid state performance of the oil-gas reaction system inhibits the action effect between oil and gas and weakens CO 2 The oil displacement and sealing efficiency have various adverse effects, so that new equipment and process design are needed according to the displacement period and the associated gas components in order to improve the associated gas oil displacement and sealing efficiency and realize resource utilization.
Aiming at the problems, an associated gas film separation technology is gradually formed, such as a method for separating associated gas CO of a CCUS oilfield, which is proposed by Chinese patent document CN217431329U 2 The device comprises a gas-liquid separation module and a pressurizing separation module, and adopts a multi-stage pressurizing multi-stage module to separate, thereby improving CO 2 The recovery efficiency of the gas is improved, the light hydrocarbon component in the produced gas is recovered, and the CO is effectively solved 2 CO in the flooding injection process 2 And the problem of difficult centralized treatment along with the extraction of associated gas. But due toThe membrane separation technology requires high flux, requires a large membrane area or multiple stages of modules to meet the requirement of the reinjection process, and in the separation engineering, C in the gas 2 ~C 6 Light components, solid-phase particles and grease can be attached to the surface of the membrane to cause membrane pollution, so that the membrane separation efficiency is reduced, regular cleaning and replacement are required, and the operation cost is increased. Next, CH after membrane separation 4 The method is difficult to effectively utilize, has higher cost of collecting and constructing pipelines, is generally directly discharged or discharged after ignition in field operation, can pollute the environment, aggravates greenhouse benefit, and is a main route for subsequent technical development and industrial upgrading due to reasonable recycling and zero emission of greenhouse gases.
Chinese patent document CN106761659A proposes a method for oil field CO 2 The purification and liquefaction process for reinjection of the flooding produced gas is characterized in that a method of pressurizing by a multistage compressor and reducing temperature by five stages of heat exchange is utilized, and CO is enabled to be separated while the produced gas is separated 2 Liquefying. Directly reinjecting the purified and liquefied product if the purified and liquefied product can meet the operation requirement, and mixing the purified and liquefied product with high-purity CO if the purified and liquefied product cannot meet the operation requirement 2 Blending and reinjection. By incorporating pure CO into the produced gas 2 Purification is carried out when CO 2 When the purity of the mixture reaches the injection concentration requirement, the mixture can be directly compressed and injected, but the blending and reinjection not only needs continuously pure CO 2 The air source is also required to adjust the blending proportion according to the injection round. The current field operation process is complicated, accurate and quantitative blending of equipment is difficult to realize, and the problem of oil-gas two-phase dipole moment difference cannot be fundamentally solved.
Chinese patent document CN104481472A proposes a CO 2 The integrated method of separation and reinjection of the produced gas. The method adopts hydrate to drive oil, and heavy components and CH in produced gas 4 Separating, leaving C 2 -C 5 And CO 2 The surfactant with higher foaming capacity can be generated by controlling the temperature and the pressure of the injection promoting liquid, so that the surfactant has the functions of fluidity regulation and oil washing. The addition of the surfactant improves the polarity of the oil-gas two phases, greatly strengthens the two-phase action effect, but has lower solubility in crude oil and often needs to be largeThe auxiliary dissolution of the auxiliary solvent increases the operation cost, and the site test has the problems that the injection mode mainly based on the miscible solvent method only can play a role in near-wellbore zone, the far-wellbore zone is still difficult to mix phases, the injection is needed in the form of aerosol, the cost is reduced, the medicament can be brought into the far-wellbore zone, the current charging equipment is relatively simple, only the slug type charging and gas injection can be carried out, the stability of the aerosol formed by one-time contact is poor, and the aerosol is difficult to be used for continuously injecting CO 2 Development area.
At present, domestic CO 2 The treatment measures for driving associated gas mainly comprise three types: separating, purifying and mixing pure CO 2 Reinjection and adjustment by adding chemical agents. However, these single treatment methods have some limitations, and cannot be selectively treated according to the produced gas produced in the production run, and these methods all require a large amount of equipment, are difficult to repair, have low return on investment, cannot meet the requirements of resource utilization and recovery improvement, and cannot fundamentally improve the polarity difference between the two phases of oil and gas. Thus, there is a need for a CO 2 The device and the method for self-circulation trapping and reinjection skid-mounted of produced gas in the oil displacement and storage process can realize resource utilization, selectively treat produced well associated gas and improve non-pure CO at the same time 2 Adverse effect on displacement effect continuously strengthens the action effect of oil and gas phases, and realizes zero emission of greenhouse gases.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention aims to provide a CO 2 Produced gas self-circulation trapping and reinjection skid-mounted device and method in oil displacement and storage process, and can realize resource utilization and simultaneously can be used according to CO (carbon monoxide) 2 The content is automatically treated to further strengthen CO 2 The oil displacement, sealing and economy three-in-one effect is suitable for continuous production of complex working condition platforms such as mountain, desert, offshore operation and the like.
The technical problems to be solved by the invention are realized by adopting the following technical scheme: for CO 2 The full-automatic recovery reinjection skid-mounted device comprises a gas-liquid-solid separation module, a primary compression module, a component identification module and a blending reinjection dieA block, an aerosol reinjection module, and a secondary compression module;
the gas-liquid-solid separation module is used for carrying out gas-liquid-solid separation on input fluid and drying separated gas to obtain separated liquid and dried gas;
the component identification module comprises a gas detection bin, a pressure sensor and CO, wherein the pressure sensor and the CO are arranged on the gas detection bin 2 Sensor and CH 4 A sensor;
the mixing and reinjection module comprises a combustion bin, wherein the combustion bin is provided with an oxygen supply pipeline and an ignition device;
the aerosol reinjection module comprises a feeding mixing bin and an atomization feeding device for feeding materials to the feeding mixing bin, and the feeding mixing bin is provided with a pressure sensor and a medicament concentration sensor;
the gas-liquid-solid separation module is provided with a fluid injection port, a liquid discharge port and a gas discharge port, and the gas discharge port is sequentially connected with the primary compression module and the gas detection bin;
the gas detection bin is respectively connected with the combustion bin, the feeding mixing bin and the inlet of the secondary compression module, the outlet of the combustion bin is connected with the gas-liquid-solid separation system through a pipeline, the feeding mixing bin is respectively connected with the inlet and the outlet of the secondary compression module through a pipeline, and the outlet of the secondary compression module is connected with the inlet of the filling pipeline;
Control valves are arranged on the pipelines between the gas detection bin and the combustion bin, the charging mixing bin and the inlet of the secondary compression module and on the pipelines between the outlet of the secondary compression module and the charging pipeline and between the outlet of the secondary compression module and the charging mixing bin.
In the above-mentioned structure, the reinforced mixed storehouse links to each other with the import and the export of second grade compression module respectively through the pipeline, and gaseous detection storehouse links to each other with the entry of second grade compression module, can mend gaseous to second grade compression module through gaseous detection storehouse under the effect of first grade compression module, under the effect of second grade compression module, can realize the reinforced mixed storehouse cyclic pressurization, utilizes atomizing feeding device to the reinforced mixed storehouse to send the medicament simultaneously, forms the circulation and feeds in raw materials promptly.
The gas outlet of the gas-liquid-solid separation module is sequentially connected with the first-stage compression module and the gas detection bin, the gas detection bin is connected with the inlet of the combustion bin, and the combustion bin is connected with the gas-liquid-solid separation system through a pipeline, so that under the action of the first-stage compression module, the oxygen doping, ignition and impurity removal can be performed on the gas separated by the gas-liquid-solid separation module, and a combustion treatment cycle, namely an impurity removal cycle, is formed.
According to the invention, the gas-liquid-solid separation module comprises a filtering device, a condensing device and a drying device which are sequentially communicated from bottom to top;
The fluid injection port is arranged at the upper end of the filtering device, and the liquid discharge port is arranged at the lower end of the filtering device. The fluid from the extraction well enters a gas-liquid-solid separation module, a fluid injection port is positioned at the upper end of a filtering device, liquid phase and solid phase move downwards due to the action of gravity differentiation, solid phase particles are filtered by the filtering device, oil water flows out of a liquid outlet through the filtering device, gas phase moves upwards, condensate gas components are separated out by a condensing device and discharged from the liquid outlet under the action of gravity, and the condensate gas components mainly comprise C 5 And the organic matters and part of water vapor, and then the rest non-condensed gas continuously rises and is further dehydrated and discharged through a drying device.
According to the invention, the gas-liquid-solid separation module further comprises a separation bin, wherein the fluid injection port, the liquid discharge port and the gas discharge port are all arranged on the separation bin, and the gas discharge port is positioned at the upper end of the separation bin;
the filtering device comprises a multi-stage screen arranged in the separation bin;
the condensing device comprises a condensing pipe arranged in the separation bin;
the drying device is arranged at the gas outlet. By arranging the separation bin, the filtering device, the condensing device and the drying device are integrated together through the separation bin, so that the device has a more compact structure.
According to the invention, the mixing and reinjection module further comprises a cold water cavity arranged outside the combustion bin, wherein the cold water cavity is provided with a water inlet pipeline and a water outlet pipeline. The cold water cavity is arranged on the outer side of the combustion bin, and the water inlet pipeline and the water outlet pipeline are arranged on the cold water cavity, so that heat in the combustion bin can be recycled.
According to the invention, the charging mixing bin, the charging pipeline and the outlet of the secondary compression module are connected with each other through a three-way valve. The three-way valve is used for connecting the feeding mixing bin, the filling pipeline and the outlet of the secondary compression module, so that the pipeline connection is simplified, the structure of the whole device is simpler, and the cost of the parts is saved.
According to the invention, the atomization feeding device comprises a storage device connected with the feeding mixing bin and a spraying device connected with the storage device, wherein the spraying device is arranged in the feeding mixing bin and is provided with a spraying pressurizing pump. The spray device is arranged to atomize and spray the medicament into the feeding and mixing bin.
According to a preferred embodiment of the invention, the storage device comprises an annular cavity arranged outside the charging mixing silo. The annular cavity is arranged outside the feeding mixing bin and used for protecting the feeding mixing bin, so that the feeding mixing bin is prevented from being broken, and CH in the gas phase is avoided 4 When the concentration is too high, explosion occurs when air is encountered; and the independent storage of the medicine bin is not needed.
The invention also discloses a method for collecting and reinjection of the produced gas in a self-circulation way, which utilizes the CO 2 The method comprises the following steps of:
(1) The produced fluid is subjected to gas-liquid-solid separation by a gas-liquid-solid separation module, and the separated mixed gas is sent to a component identification module by a first-stage compression module;
(2) Determination of CO in a gas mixture by means of a component recognition module 2 And CH (CH) 4 Is the ratio of (2);
(3) Based on the mixed gas CH in the component recognition module 4 And CO 2 Selecting the following corresponding treatment measures;
the first treatment measure is: when producing CH in gas 4 When the content of the gas in the gas detection bin is more than b percent, the gas in the gas detection bin enters combustionBurning the cabin to remove impurities by oxygen doping ignition, and burning organic gas to generate CO 2 The mixture is returned to the gas-liquid-solid separation module for further mixing and purification after gas-liquid separation;
the second treatment measure is as follows: when producing CH in gas 4 When the content of the gas in the gas detection bin is between a percent and b percent, the gas in the gas detection bin enters the charging mixing bin through a control valve between the gas detection bin and the charging mixing bin, and the gas enters the charging mixing bin according to CO 2 Charging the actual concentration to prepare aerosol;
In addition, the secondary compression module is utilized to supplement the gas in the gas detection bin into the feeding mixing bin for pressurization, and the gas is injected back through the injection pipeline after uniform and stable aerosol is formed through cyclic pressurization and feeding;
the third treatment measure: when producing CH in gas 4 When the content of the produced gas is below a%, the produced gas is directly pressurized and reinjected through the secondary compression module, or the produced gas is further added with a medicament through a second treatment measure to improve the development effect;
the a% and the b% are preset values, and a is smaller than b.
The CH described above 4 The contents a% and b% of (C) are preset values, and in the first measure, according to CH 4 The amount of oxygen introduced is determined by the amount of oxygen introduced.
According to the invention, it is preferred that when CH in the produced gas 4 When the content of the catalyst is more than b%, the catalyst is treated by a first measure, and when the CH in the gas detection bin 4 When the content of the gas reaches a percent to b percent, closing a control valve between the gas detection bin and the combustion bin, opening the control valve between the gas detection bin and the charging mixing bin, closing the control valve between the gas detection bin and the charging mixing bin and opening the control valve between the gas detection bin and the combustion bin after the pressure value of the pressure sensor is stable, and then preparing aerosol in the charging mixing bin by utilizing a second treatment measure; and simultaneously, continuously carrying out oxygen doping ignition and impurity removal on the mixed gas in the combustion bin.
And when the preparation of the aerosol in the feeding mixing bin is finished, in the process of injecting the aerosol into the stratum, closing a control valve between the gas detection bin and the feeding mixing bin, after the aerosol is filled, closing the control valve between the gas detection bin and the combustion bin, opening the control valve between the gas detection bin and the feeding mixing bin, supplementing gas into the feeding mixing bin, and repeating the process.
In the above process, the impurity removal cycle corresponding to the first treatment measure and the charging cycle corresponding to the second treatment measure do not interfere with each other, the two cycles operate simultaneously, but the priority of the charging cycle is higher than that of the impurity removal cycle, after the charging cycle is finished, aerosol is injected into the stratum, the pressure of the charging mixing bin is rapidly reduced, at the moment, a control valve between the gas detection bin and the secondary compression module is closed, and a control valve between the gas detection bin and the charging mixing bin is opened, so that gas is fed into the charging mixing bin until the two cycles stably operate. The invention provides a combustion treatment cycle and a cyclic charging cycle based on the recovery treatment and reinjection of the produced gas, and the two cycles are operated simultaneously and do not interfere with each other in the field operation, and the recovery reinjection process can be carried out simultaneously, thereby avoiding the loss of equipment and the damage to the oil reservoir caused by intermittent operation.
According to a preferred second measure of the invention, the aerosol is prepared by:
firstly, pressurizing and feeding the mixed gas into a feeding mixing bin by using a first-stage compression module, and simultaneously feeding the mixed gas into the feeding mixing bin by using an atomization feeding device to prepare aerosol;
then stopping the operation of the atomization feeding device, opening a control valve between the feeding mixing bin and the outlet of the secondary compression module and a control valve between the gas detection bin and the inlet of the secondary compression module, supplementing gas into the feeding mixing bin by using the primary compression module and the secondary compression module, increasing the solubility of the medicament in the gas phase in the feeding mixing bin after pressurization, restarting the atomization feeding device for feeding, and closing the control valve between the gas detection bin and the inlet of the secondary compression module after the values of the pressure sensor and the medicament concentration sensor are stable, namely, under the common pressure of the primary compression module and the secondary compression module, the dissolution of the medicament in the gas phase is saturated. The concentration of the medicament contained in the aerosol prepared by the pressurization of the primary compression module is limited, so that the injected aerosol is more stable and contains more medicaments, a better oil displacement effect is realized, the pressurization circulation is performed by the secondary compression module, the medicament concentration of the aerosol is further improved, and medicament molecules can be rapidly and uniformly dispersed as far as possible by combining the cyclic pressurization with the stirring of a magnetic machine, so that the aerosol in a feeding mixing bin is more uniformly distributed, and layering phenomenon in the subsequent injection process is avoided; and the secondary compression module is mainly used for injection at the oil well side, and the pressure value of the secondary compression module is closer to the stratum pressure, so that stable injection of aerosol can be ensured.
The invention is characterized in that: to overcome CO 2 CH in associated gas 4 For CO 2 The invention provides a method for strengthening the oil-gas two-phase action effect by using the adverse effect of flooding, which is used for CO 2 The device comprises a gas-liquid-solid separation system, a multi-stage compression system, a gas identification system and a gas treatment system.
The gas-liquid-solid separation module in the gas-liquid-solid separation system is used for separating produced fluid of the extraction well, and the multistage screen, the serpentine condenser pipe and the drying agent are sequentially subjected to solid-liquid separation and gas-liquid separation to obtain separated oil water and dry produced gas.
The multistage compression system is used for pressurizing the dried produced gas, facilitates subsequent centralized impurity removal, feeding and reinjection, and comprises a primary compression module and a secondary compression module which correspond to impurity removal circulation and feeding circulation respectively.
The component recognition module in the gas recognition system is used for storing and recognizing the first-stage compressed produced gas, monitoring the components of the produced gas in real time through the methane sensor and the carbon dioxide sensor, and determining a final treatment scheme according to different gas ratios.
The gas treatment system is used for treating the identified gas, and has three treatment modes, wherein the first treatment mode is to send the produced gas to a combustion bin of the blending reinjection module, the impurity removal is circularly ignited by automatically controlling the oxygen injection amount, the second treatment mode is to send the produced gas to a feeding mixing bin of the aerosol reinjection module, the stable aerosol is formed by spraying, continuously stirring and circularly compressing the produced gas through an automatic control nozzle, and the third treatment mode is to directly pump the produced gas to the secondary compression module for pressurization reinjection.
Wherein the catalyst is used for CO 2 The fully-automatic recycling and reinjection skid-mounted device for the produced gas in the oil displacement and storage process also comprises a battery pack device for stirring, a three-way valve device for controlling feeding circulation, a high-pressure pipeline connected with each cavity and an electric control valve device; the automation of the process is realized by controlling the device through a computer.
In a second aspect, the invention provides a method for self-circulating trapping and reinjection of produced gas, the method comprising:
(1) The produced fluid is subjected to gas-liquid-solid separation by a gas-liquid-solid separation module, wherein the mixed gas is pumped to a gas detection bin through a first-stage pressurizing pump.
(2) Determination of CO in a gas detection cartridge by a gas sensor 2 And CH (CH) 4 The computer selectively opens the electric control valve according to the automatic feedback processing mode of the gas components.
(3) The first treatment measure is: the produced gas contains more CH 4 Then enters a combustion bin, impurities are removed through oxygen doping ignition for multiple times, and CO generated by the combustion of organic gas 2 And returning to the separation bin for further blending and purification, and recycling the combustion heat to the boiler to realize resource utilization.
(4) The second treatment measure is as follows: the produced gas contains a small amount of CH 4 Then enter a feeding mixing bin according to CO 2 The actual concentration is sprayed for charging, and even and stable aerosol is formed after the circulating pressurization and charging, and then the aerosol is automatically refilled by an electric control valve.
(5) The third treatment measure: if CO 2 The content can reach the concentration required by displacement, and the produced gas can be directly pressurized and reinjected through the secondary compression module, and the development effect can be improved by further adding a medicament by utilizing a second treatment measure.
Wherein, the control conditions can be changed at the computer terminal to adapt to different oil and gas reservoir action requirements.
Compared with the prior art, the invention has the following advantages:
the invention carries out multifunctional selective treatment on associated gas in different extraction stages through the gas sensor, and carries out the selective treatment according to CH 4 Different treatment schemes for forming aerosol by separating and reinjection, blending and reinjection or adding medicaments, and combining the three treatment measures can not only eliminate the impure CO 2 The adverse effect of the flooding can further strengthen the oil gas action effect, improve the crude oil recovery ratio and strengthen the CCUS integrated operation.
The invention uses CO 2 Sensor, CH 4 The sensor, the pressure sensor and the medicament concentration sensor measure the gas phase components and the pressure of each circulation stage in real time, and the accurate single oxygen doping and feeding injection quantity is measured, so that the full combustion and uniform feeding are ensured, and the doping pollution and medicament waste caused by general treatment are avoided.
The invention has wide application range, is suitable for various oil and gas reservoirs, and can meet the production operation of different types. For a thin oil reservoir with a large number of light components, control conditions can be adjusted according to actual operation requirements, recovery and reinjection operation with high economic cost performance can be realized, for a thick oil reservoir with a large number of heavy components, injected gas can be thickened in the initial stage of injection, and even dispersion and complete dissolution of medicaments can be realized through repeated cyclic pressurization, feeding and stirring of two stages of compression pumps 2 Fracturing, CO 2 Drilling and other fields.
The invention designs the skid-mounted device with the integration of automatic recovery and reinjection according to the associated gas components, and the skid-mounted device can be directly connected into a production well and an injection well to carry out production operation on site, has the advantages of exquisite device, sound function, simple operation and convenient use, avoids manpower and material resources required by trimming operation and adjustment of a treatment scheme, can realize automatic operation by combining a sensor and a control valve in the whole process, and is suitable for complex working condition platforms such as mountain, desert, offshore operation and the like.
According to the invention, the complete zero emission of greenhouse gas in the extraction-injection process is realized for the first time, the complete utilization of greenhouse gas methane and carbon dioxide resources is realized, the oil displacement-embedding integrated operation is realized, the effects of protecting the environment and realizing sustainable development are achieved, the combustion heat in the recovery process can be collected, and a heat source is provided for subsequent water-gas exchange injection and factory life.
Drawings
FIG. 1 is a schematic diagram of the CO according to the present invention 2 The structure schematic diagram of the produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process;
in the figure, 1000 feet;
the device comprises a gas-liquid-solid separation module 1, a primary compression module 2, a component 3 identification module, a mixing reinjection module 4, an aerosol reinjection module 5, a secondary compression module 6 and a filling pipeline 7;
101 a fluid inlet, 102 a liquid outlet, 103 a gas outlet;
31 gas detection bin, 32CO 2 Sensor, 33CH 4 A sensor;
41 combustion bin, 411 oxygen supply pipeline, 412 ignition device, 42 cold water cavity, 421 water inlet pipeline, 422 water outlet pipeline;
51 charging and mixing bin, 52 atomization charging device, 521 storage device and 522 spraying device;
a 100 pressure sensor, a 200 medicament concentration sensor;
11 filter unit, 12 condensing unit, 13 drying unit, 14 separating bin.
Detailed Description
The operation of the device according to the invention will be fully and precisely elucidated with reference to the accompanying drawings.
As shown in fig. 1, a CO 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process comprises a gas-liquid-solid separation module 1, a primary compression module 2, a component identification module 3, a blending reinjection module 4, an aerosol reinjection module 5 and a secondary compression module 6 which are arranged on a base 1000. The primary compression module 2 and the secondary compression module 6 are both compression pumps.
The gas-liquid-solid separation module 1 is used for carrying out gas-liquid-solid separation on input fluid and drying separated gas to obtain separated liquid and dried gas.
The component identification module 3 comprises a gas detection bin 31 and pressure sensors 100 and CO arranged on the gas detection bin 31 2 Sensor 32 and CH 4 A sensor 33.
The blending reinjection module 4 comprises a combustion chamber 41, the combustion chamber 41 being provided with an oxygen supply duct 411 and an ignition device 412.
The aerosol reinjection module 5 comprises a feeding mixing bin 51 and an atomization feeding device 52 for feeding the feeding mixing bin 51, and the feeding mixing bin 51 is provided with a pressure sensor 100 and a medicament concentration sensor 200. The stirring device is arranged in the feeding mixing bin 51, the stirring device is an electromagnetic stirring device, the stirring device is arranged for faster and better mixing of a foam system, the field operation efficiency is improved, the medicament concentration sensor 200 is a surfactant sensor, and the medicament is a surfactant.
The gas-liquid-solid separation module 1 is provided with a fluid injection port 101, a liquid discharge port 102 and a gas discharge port 103, and the gas discharge port 103 is sequentially connected with the primary compression module 2 and the gas detection bin 31.
The gas detection bin 31 is respectively connected with the combustion bin 41, the feeding mixing bin 51 and the inlet of the secondary compression module 6, the outlet of the combustion bin 41 is connected with the gas-liquid-solid separation system 1 through a pipeline, the feeding mixing bin 51 is respectively connected with the inlet and the outlet of the secondary compression module 6 through a pipeline, and the outlet of the secondary compression module 6 is connected with the inlet of the filling pipeline 7. A drying device 13 is arranged between the outlet of the combustion bin 41 and the gas-liquid-solid separation system 1. By providing the drying device 13 alone, the load of the drying device 13 at the gas discharge port 103 is facilitated to be reduced.
Control valves are arranged on the pipelines between the gas detection bin 31 and the inlets of the combustion bin 41, the charging mixing bin 51 and the secondary compression module 6 and on the pipelines between the outlet of the secondary compression module 6 and the charging pipeline 7 and between the outlet of the secondary compression module 6 and the charging mixing bin 51.
The gas-liquid-solid separation module 1 comprises a filtering device 11, a condensing device 12 and a drying device 13 which are sequentially communicated from bottom to top.
The fluid inlet 101 is provided at the upper end of the filter device 11, and the liquid outlet 102 is provided at the lower end of the filter device 11.
The gas-liquid-solid separation module 1 further comprises a separation bin 14, wherein the fluid injection port 101, the liquid discharge port 102 and the gas discharge port 103 are all arranged on the separation bin 14, and the gas discharge port 103 is positioned at the upper end of the separation bin 14.
The filtering device 11 comprises a multi-stage screen arranged inside the separation bin 14.
The condensing means 12 comprise a condensing duct arranged inside the separation bin 14.
The drying device 13 is arranged at the gas outlet 103, and a drying agent is arranged in the drying device 13.
The mixing and reinjection module 4 further comprises a cold water cavity 42 arranged outside the combustion bin 41, wherein the cold water cavity 42 is provided with a water inlet pipeline 421 and a water outlet pipeline 422.
The outlets of the charging mixing bin 51, the charging pipeline 7 and the secondary compression module 6 are mutually connected through three-way valves, namely, the control valve on the pipeline between the outlet of the secondary compression module 6 and the charging pipeline 7 as well as between the outlet of the secondary compression module and the charging mixing bin 51 is a three-way valve. The control valves and the three-way valves between the gas detection bin 31 and the combustion bin 41, the charging and mixing bin 51 and the secondary compression module 6 are all electric control valves, and automatic control can be realized through a computer end.
The atomized charging device 52 comprises a storage device 521 connected with the charging mixing bin 51 and a spraying device 522 connected with the storage device 521, wherein the spraying device 522 is arranged inside the charging mixing bin 51. The shower 522 is provided with a shower head and a pressurizing pump.
The storage device 521 comprises an annular cavity arranged outside the feed mixing bin 51.
Method for self-circulation trapping and reinjection of produced gas by utilizing CO 2 The method comprises the following steps of:
(1) The produced fluid is subjected to gas-liquid-solid separation by a gas-liquid-solid separation module 1, and the separated mixed gas is sent to a component identification module 3 by a first-stage compression module 2.
(2) Determination of CO in a gas mixture by means of a component detection module 3 2 And CH (CH) 4 Is a ratio of (c) to (d).
(3) Based on the mixed gas CH in the component recognition module 3 4 And CO 2 The following corresponding treatment measures are selected.
The first treatment measure is: when producing CH in gas 4 When the content of (B) is above, the gas in the gas detection bin 31 enters the combustion bin 41 to perform oxygen doping ignition for impurity removal, and CO generated by the combustion of organic gas 2 The returned gas-liquid-solid separation module 1 is further blended and purified after gas-liquid separation.
The second treatment measure is as follows: when producing CH in gas 4 When the content of the catalyst is between a% and b%, the gas in the gas detection bin 31 enters the charging mixing bin 51 through a control valve between the gas detection bin 31 and the charging mixing bin 51, and is processed according to CO 2 The actual concentration is fed to prepare aerosol.
In addition, the secondary compression module 6 is used for supplementing the gas in the gas detection bin 31 into the feeding mixing bin 51 for pressurization, and the gas is injected back through the filling pipeline 7 after being circularly pressurized and fed to form uniform and stable aerosol.
The third treatment measure: when producing CH in gas 4 When the content of the produced gas is below a%, the produced gas is directly pressurized and reinjected through the secondary compression module 6, or the produced gas is further added with a medicament through a second treatment measure to improve the development effect.
The a% and the b% are preset values, and a is smaller than b. CH in produced gas at different stages of gas-driven oil extraction 4 In order to determine at which stage the gas-drive oil recovery is in particular, to change the corresponding treatment measures, CH in the produced gas 4 Can be obtained by providing a corresponding CO at the production wellhead or at the fluid injection port 101 2 Sensor 32 and CH 4 The sensor 33 detects the detection, or may determine the detection according to another method.
When producing CH in gas 4 When the content of (C) is above b%, the gas is treated by the first measure, and CH in the gas detection bin 31 4 When the content of (a) to (b%), the gas detection chamber 31 is closed and the combustion is performedA control valve between the bins 41 is opened, a control valve between the gas detection bin 31 and the charging mixing bin 51 is opened, after the pressure value of the pressure sensor 100 is stable, the control valve between the gas detection bin 31 and the charging mixing bin 51 is closed, the control valve between the gas detection bin 31 and the combustion bin 41 is opened, and then aerosol preparation is carried out in the charging mixing bin 51 by utilizing a second treatment measure; while continuing to perform oxygen-doped ignition and impurity removal on the mixture in the combustion chamber 41.
When the preparation of the aerosol in the feeding mixing bin 51 is completed, in the process of injecting the aerosol into the stratum, a control valve between the gas detection bin 31 and the feeding mixing bin 51 is closed, after the aerosol injection is completed, a control valve between the gas detection bin 31 and the combustion bin 41 is closed, a control valve between the gas detection bin 31 and the feeding mixing bin 51 is opened, and gas is fed into the feeding mixing bin 51, so that the process is repeated. In the above process, the impurity removal cycle corresponding to the first treatment measure and the charging cycle corresponding to the second treatment measure do not interfere with each other, and the two cycles operate simultaneously, but the priority of the charging cycle is greater than that of the impurity removal cycle, after the charging cycle is finished, aerosol is injected into the stratum, the pressure in the charging mixing bin 51 is rapidly reduced, the pressure in the charging mixing bin 51 is far less than that in the gas detection bin 31, at this time, a control valve between the gas detection bin 31 and the secondary compression module 6 is closed, and a control valve between the gas detection bin 31 and the charging mixing bin 51 is opened, so that gas is fed into the charging mixing bin 51 until the two cycles stably operate. Specifically, the pressure sensor 100 is used to measure the pressure value P2 of the charging and mixing bin 51 and the pressure value P1 of the gas detection bin 31 respectively, and when the difference between P1 and P2 is greater than the set threshold, it is indicated that the aerosol injection in the charging and mixing bin 51 is completed, and the process is determined according to the pressure value.
In the second measure, the preparation method of the aerosol specifically comprises the following steps:
firstly, the mixed gas is pressurized and sent into a charging and mixing bin 51 by a primary compression module 2, meanwhile, an atomization charging device 52 is used for charging the charging and mixing bin 51 for preparing aerosol, in the preparation process, the concentration of the medicament is monitored in real time by a medicament concentration sensor 200, and when the concentration of the medicament is unchanged, the medicament is dissolved in the gas phase to be saturated under the pressure of the primary compression module 2, so that stable aerosol is formed.
Then stopping the operation of the atomization feeding device 52, opening a control valve between the feeding mixing bin 51 and the outlet of the secondary compression module 6 and a control valve between the gas detection bin 31 and the inlet of the secondary compression module 6, supplementing gas into the feeding mixing bin 51 by using the primary compression module 2 and the secondary compression module 6, increasing the solubility of the traditional Chinese medicine agent in the gas phase in the feeding mixing bin 51 after pressurization, restarting the atomization feeding device 52 for feeding, and closing the control valve between the gas detection bin 31 and the inlet of the secondary compression module 6 after the numerical values of the pressure sensor 100 and the medicine agent concentration sensor 200 are stable, namely, under the common pressure of the primary compression module 2 and the secondary compression module 6, the dissolution of the medicine agent in the gas phase is saturated.
The specific implementation process comprises the following steps:
the fluid of the extraction well enters a skid-mounted device from a fluid injection port 101, enters a gas-liquid-solid separation module 1, and liquid phase moves downwards due to the action of gravity separation, solid phase particles passing through a multi-stage screen are filtered and are divided into three particle sizes of large, medium and small, oil water flows out from a liquid discharge port 102 through the screen, gas phase moves upwards, and condensate gas components therein are separated out through a condensing tube and mainly comprise C 5 And the above organics and part of the water vapor, and then the remaining non-condensable gases are further dehydrated by a desiccant in the drying apparatus 13.
The completely dried non-condensate gas is pressurized by the first-stage compression module 2, and the pressurized gas is sent to the gas detection bin 31 for monitoring and identification, and meanwhile, the CO in the gas detection bin 31 is detected 2 Sensor and CH 4 The sensor starts to detect CO 2 、CH 4 And sends an electric signal once a second to a computer terminal, and after the pressure in the gas detection bin 31 reaches the maximum value of the first-stage compression module 2, the computer terminal automatically determines a processing scheme according to control conditions, and sends a signal to one of the electric control valves between the gas detection bin 31 and the combustion bin 41, the charging mixing bin 51 and the second-stage compression module 6 for automatic processing.
All control conditions of the electric control valve can be set manually,And modifying, namely adjusting according to physical parameters of the oil reservoir and on-site operation requirements. The control conditions in the embodiments of the present invention are: setting CH in system 4 When the content is above 40%, opening an electric control valve between the gas detection bin 31 and the combustion bin 41; when CH 4 When the content is more than 10% and less than 40%, an electric control valve between the gas detection bin 31 and the feeding mixing bin 51 is opened; when CH 4 When the content is below 10%, an electric control valve between the gas detection bin 31 and the secondary compression module 6 is opened.
If the gas detects CH in the bin 31 4 When the content of the mixture is above 40%, the mixture is pumped to the combustion bin 41, and the gas processing system accurately determines the mixing O according to the reading of the methane sensor 2 The amount of O is required to quantitatively incorporate O in order to prevent insufficient combustion 2 The ignition device 412 is then used to continuously ignite and remove impurities.
CO produced after complete combustion 2 The non-pure CO enters a condensing cavity after being dehydrated by a desiccant and is communicated with an output well 2 The heat of combustion generated by the mixing is absorbed by the cold water in the cold water cavity 42, and provides a heat source for the life and operation of the factory, thereby achieving the purpose of resource utilization.
If the gas detects CH in the bin 31 4 When the content of the surfactant is more than 10% and less than 40%, the mixed gas is pumped to the feeding mixing bin 51, at this time, the spray head of the spray device 522 and the surfactant sensor start to work, the spray device 522 sprays the medicament once every 10 seconds, the single medicament amount can be set manually, the surfactant sensor sends an electric signal once a second, and the change condition of the concentration of the surfactant is transmitted in real time. The surfactant is periodically replenished into the storage device 521.
When the concentration of the surfactant is unchanged, the dissolution of the medicament in the gas phase is saturated under the pressure of the primary compression module 2 to form stable aerosol, at the moment, the computer sends a stop signal to the spraying device 522, and an electric control valve between the outlet of the secondary compression module 6 and the feeding mixing bin 51 is opened to enable the aerosol to enter the secondary compression module 6.
After the aerosol just enters the secondary compression module 6, an electric control valve between the gas detection bin 31 and the secondary compression module 6 is opened, the secondary compression module 6 is continuously supplemented with air, the system pressure does not reach a peak value in a short time, the outlet of the three-way valve connected with the filling pipeline 7 is closed, the other two channels are normally opened, the pressurized aerosol returns to the feeding mixing bin 51 through the three-way valve, and the higher the gas phase pressure is, the higher the solubility of the surfactant in the gas phase is, at the moment, the spraying device 522 is restarted, the surfactant is continuously dissolved in the aerosol, and the feeding mixing bin 51, the secondary compression module 6 and the three-way valve enter a pressurizing and feeding cycle.
When the pressure sensor 100 and the indication of the surfactant sensor are basically kept unchanged, an electric control valve between the gas detection bin 31 and the secondary compression module 6 is closed, the dissolution of the medicament in the gas phase reaches saturation under the pressure of the secondary compression module 6, at the moment, the outlet of the three-way valve connected with the feeding mixing bin 51 is closed, the other two channels are normally opened, and aerosol in the feeding mixing bin 51 is directly injected into an oil well through the filling pipeline 7, so that automatic injection is realized.
If the gas detects CH in the bin 31 4 When the content of (2) is less than 10%, the mixture is sent to the secondary compression module 6 for pressurization. The computer terminal can select whether to feed or not, if the feeding is not needed, the outlet of the three-way valve connected feeding mixing bin 51 is closed, and the gas pressurized by the secondary compression module 6 is directly injected into the oil well through the filling pipeline 7. If charging is needed, the outlet of the three-way valve connected with the charging pipeline 7 is closed, gas enters the charging mixing bin 51, the subsequent steps are consistent with the cyclic pressurization and charging processes, when the surfactant is dissolved and saturated, the aerosol tends to be stable, the outlet of the three-way valve connected with the charging pipeline 7 is opened, and the aerosol is automatically injected into an oil well.
Example 1
This example 1 uses a hypotonic thin oil reservoir CO 2 The treatment of associated gas is driven, the oil product of the thin oil reservoir is lighter, and belongs to low-density and low-viscosity crude oil, CO 2 In the supercritical state, the polarity of the mixed phase is similar to that of crude oil, and when the pressure exceeds the minimum mixed phase pressure of the crude oil, SC-CO 2 The oil-gas interfacial tension can be greatly reduced by extracting a large amount of light components in the thin oil through multiple contact, when the interfacial tension is reduced to zero, two phases are mixed into one phase without interfacial energy, and then the mixed phase displacement stage is carried out. When it is pureCO 2 Incorporating CH into the phase 4 After that, CO 2 The supercritical liquid phase performance of (C) is destroyed, the dipole moment between oil and gas is increased, the two-phase action effect is poor, the interfacial tension is reduced, and CH 4 The more the content is to CO 2 The worse the displacement effect is, due to the light oil reservoir CH 4 The produced gas has high content and can not be directly reinjected, and the produced gas is required to be injected according to different CH 4 The produced content is treated in stages. This embodiment will be described in detail from the three stages of initial gas injection, stable displacement, and gas channeling.
Initial CO injection 2 When CO 2 Low injection PV and most of CO 2 Stays near the injection well, where the production well has little CO 2 Yield of more than 80 percent of CH 4 Mainly, produced gas enters from an injection end, passes through the filtering device 11, the condensing device 12 and the drying device 13, then enters the first-stage compression module 2, at the moment, produced solid particles and produced oil water are completely separated, and the produced gas is pumped to the gas detection bin 31 after being compressed. Under the action of the first-stage compression module 2, the pressure of the gas detection bin 31 gradually rises, and CO 2 Sensor and CH 4 The sensor detects CH 4 88% of the ratio, CO 2 The ratio of the gas is 5%, the rest 7% is the rest gas, when the pressure P1 of the detection bin tends to be stable, the electric control valve between the gas detection bin 31 and the combustion bin 41 is automatically controlled by a computer to be opened, and the generated gas enters the combustion bin 41 and is converted into a gas by CH 4 Is burnt by mixing oxygen, and CH 4 Combustion to produce CO 2 And water vapor, the mixed gas is returned to the separation bin 14 through a pipeline, and thus the circulation and impurity removal are started by using the compressor, the gas detection bin 31, the combustion bin 41 and the separation bin 14.
After the oxygen-doped combustion for a plurality of times, CH in the gas detection bin 31 is caused 4 After the content is reduced to 40% and the pressure P1 of the detection bin tends to be stable, at the moment, the electric control valve between the gas detection bin 31 and the combustion bin 41 is closed, the electric control valve between the gas detection bin 31 and the feeding mixing bin 51 is opened, gas rapidly enters the feeding mixing bin 51, after the pressure P1 of the gas detection bin 31 is close to the pressure P2 of the feeding mixing bin 51, namely, the pressure value of the pressure sensor 100 is stable, the electric control valve between the gas detection bin 31 and the combustion bin 41 is opened, and the gas detection bin 31 and the feeding mixing bin 51 are openedThe electronically controlled valve between the feed mixing bins 51 is closed and the spray device 522 begins to spray the feed to form a stable aerosol. The electronically controlled valve between the gas detection cartridge 31 and the secondary compression module 6 is then opened, whereupon the aerosol enters a pressurized feed cycle. During operation, impurity removal circulation and charging circulation are not interfered with each other, the two circulation can be operated simultaneously, but the priority of the charging circulation is higher than that of the impurity removal circulation, after the charging circulation is finished, aerosol is injected into the stratum, the pressure of the charging mixing bin 51 is rapidly reduced, the pressure P2 of the charging mixing bin 51 is far lower than that of the gas detection bin 31P1, at the moment, an electric control valve between the gas detection bin 31 and the charging mixing bin 51 is opened, an electric control valve between the gas detection bin 31 and the secondary compression module 6 is closed, and air is supplemented to the charging mixing bin 51 until the two circulation stably operates.
Stable displacement phase, CO 2 The content is rapidly increased, CH 4 Reduced content of CO at this time 2 The content is 60%, CH 4 The content is 30%, and the content of the rest gas is 10%. The produced gas does not need to enter the combustion bin 41 for treatment, and only needs to enter the feeding mixing bin 51 for circulating feeding and pressurizing to form stable aerosol injection. Due to stable production stage CO 2 The preparation method has the advantages that the preparation is added into the stratum to form stable aerosol foam, so that the oil gas effect can be improved, the multi-stage gas sensitive effect of the porous medium can be utilized to block the dominant channel, the gas driving wave range is enlarged, and the purpose of improving the recovery ratio is achieved.
After the gas channeling, CO 2 The content further increases, at this time CO 2 The content is 90%, CH 4 The content is 5%, and the rest gas content is 5%, at this time, the third measure of the invention is adopted, and two treatment modes are adopted: (1) CO by addition of low molecular polymers 2 Thickening, improving the dominant channel, achieving the effect of profile control and flooding, and enabling the feeding step to be consistent with the second measure. (2) Directly injecting, allowing produced gas to enter a gas detection bin 31 through primary compression after gas-liquid-solid separation, and after the pressure P1 in the cavity of the gas detection bin 31 is stable, opening an electric control valve between the gas detection bin 31 and the secondary compression module 6, and allowing the gas to enter the secondary compression module 6 for further pressurization to the injection pipeline 7.
Example 2
This example 2 uses medium-permeability heavy oil reservoir CO 2 And (5) treating associated gas. Heavy oil reservoir oil products and dissolved gas (CH) 4 ) The content is less, belongs to high-density and high-viscosity crude oil, and the difference between the non-condensate gas and the dipole moment of the crude oil is large, so that the mixed phase flooding is difficult to realize.
CO injection in heavy oil reservoirs in general 2 Is used for reducing the viscosity and fluidity ratio of the thick oil, expanding the sweep range and further playing a role of CO 2 For the purpose of displacement of reservoir oil, although CO is injected 2 The post fluidity ratio is reduced to some extent, but the fingering phenomenon is still serious from the whole block, the oil well rapidly sees gas, and multiple rounds of gas injection enter into ineffective circulation.
The device can directly form thickening aerosol before gas injection, thereby fundamentally improving CO injection of the heavy oil reservoir 2 And (3) oil displacement and storage effects.
At this time, the second measure of the invention is adopted to collect the CO 2 The gas enters the gas detection bin 31 through the first-stage compression module 2, and after the cavity pressure P1 of the gas detection bin 31 is stabilized, an electric control valve between the gas detection bin 31 and the feeding mixing bin 51 is opened to enable CO to be discharged 2 Is pumped to a charging mixing bin 51 for thickening operation, and the medicament is prepared by compounding low molecular polymer and surfactant, and is directly injected into the stratum after charging and pressurizing circulation.
After the gas is seen from the oil well of the heavy oil reservoir, the CO is stored under the sealing effect of the reservoir 2 The total production amount is reduced, CH 4 The content of the produced gas is relatively low, and the produced gas and the external CO needing to be buried can be used for further improving the recovery ratio and strengthening the oil displacement and burying operation 2 The gas source is mixed, the extraction well is connected with the fluid injection port 101, and the combustion bin 41 is not used in the treatment process, so that pure CO 2 Is injected from the oxygen supply pipeline 411, thereby realizing the rational utilization of the equipment. After the primary compression, the mixed gas is sent to a gas detection bin 31 and a charging mixing bin 51 for cyclic thickening operation, and after the thickening is finished, an outlet of the secondary compression module 6 is communicated with the filling pipeline 7 by a three-way valve, so that automatic injection is realized.
Claims (10)
1. CO (carbon monoxide) 2 Produced gas self-circulation trapping and reinjection skid-mounted device in oil displacement and storage processThe device is characterized in that: the device comprises a gas-liquid-solid separation module (1), a primary compression module (2), a component identification module (3), a blending reinjection module (4), an aerosol reinjection module (5) and a secondary compression module (6);
the gas-liquid-solid separation module (1) is used for carrying out gas-liquid-solid separation on input fluid and drying separated gas to obtain separated liquid and dried gas;
the component identification module (3) comprises a gas detection bin (31), and a pressure sensor (100) and CO arranged on the gas detection bin (31) 2 Sensor (32) and CH 4 A sensor (33);
the mixing and reinjection module (4) comprises a combustion bin (41), wherein the combustion bin (41) is provided with an oxygen supply pipeline (411) and an ignition device (412);
the aerosol reinjection module (5) comprises a feeding mixing bin (51) and an atomization feeding device (52) for feeding the feeding mixing bin (51), wherein a pressure sensor (100) and a medicament concentration sensor (200) are arranged on the feeding mixing bin (51);
the gas-liquid-solid separation module (1) is provided with a fluid injection port (101), a liquid discharge port (102) and a gas discharge port (103), and the gas discharge port (103) is sequentially connected with the primary compression module (2) and the gas detection bin (31);
the gas detection bin (31) is respectively connected with the combustion bin (41), the feeding mixing bin (51) and the inlet of the secondary compression module (6), the outlet of the combustion bin (41) is connected with the gas-liquid-solid separation module (1) through a pipeline, the feeding mixing bin (51) is respectively connected with the inlet and the outlet of the secondary compression module (6) through a pipeline, and the outlet of the secondary compression module (6) is connected with the inlet of the filling pipeline (7);
Control valves are arranged on the pipelines between the gas detection bin (31) and the combustion bin (41), the charging mixing bin (51) and the inlet of the secondary compression module (6) and on the pipelines between the outlet of the secondary compression module (6) and the charging pipeline (7) and between the outlet of the secondary compression module and the charging mixing bin (51).
2. The CO according to claim 1 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process is characterized in that: the gas-liquid-solid separation module (1) comprises a filtering device (11), a condensing device (12) and a drying device (13) which are sequentially communicated from bottom to top;
the fluid injection port (101) is arranged at the upper end of the filtering device (11), and the liquid discharge port (102) is arranged at the lower end of the filtering device (11).
3. The CO according to claim 2 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process is characterized in that: the gas-liquid-solid separation module (1) further comprises a separation bin (14), wherein the fluid injection port (101), the liquid discharge port (102) and the gas discharge port (103) are all arranged on the separation bin (14), and the gas discharge port (103) is positioned at the upper end of the separation bin (14);
the filtering device (11) comprises a multi-stage screen arranged inside the separation bin (14);
The condensing device (12) comprises a condensing pipe arranged inside the separation bin (14);
the drying device (13) is arranged at the gas outlet (103).
4. The CO according to claim 1 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process is characterized in that: the mixing and reinjection module (4) further comprises a cold water cavity (42) arranged outside the combustion bin (41), and the cold water cavity (42) is provided with a water inlet pipeline (421) and a water outlet pipeline (422).
5. The CO according to claim 1 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process is characterized in that: the outlets of the feeding mixing bin (51), the filling pipeline (7) and the secondary compression module (6) are mutually connected through a three-way valve.
6. The CO according to claim 1 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process is characterized in that: the atomization feeding device (52) comprises a storage device (521) connected with the feeding mixing bin (51) and a spraying device (522) connected with the storage device (521), and the spraying device (522) is arranged inside the feeding mixing bin (51).
7. The CO of claim 6 2 The produced gas self-circulation trapping and reinjection skid-mounted device in the oil displacement and storage process is characterized in that: the storage device (521) comprises an annular cavity arranged outside the charging mixing bin (51).
8. Method for self-circulation trapping and reinjection of produced gas by using CO according to any one of claims 1-7 2 The method is characterized by comprising the following steps of:
the method comprises the steps that (1) produced fluid is subjected to gas-liquid-solid separation through a gas-liquid-solid separation module (1), and separated mixed gas is sent to a component identification module (3) through a first-stage compression module (2);
(2) Determination of CO in a gas mixture by means of a component detection module (3) 2 And CH (CH) 4 Is the ratio of (2);
(3) Based on the mixed gas CH in the component recognition module (3) 4 And CO 2 Selecting the following corresponding treatment measures;
the first treatment measure is: when producing CH in gas 4 When the content of (a) is more than b%, the gas in the gas detection bin (31) enters the combustion bin (41) to perform oxygen doping ignition for impurity removal, and CO generated by the combustion of organic gas 2 The gas-liquid separation module (1) is returned for further mixing and purification after gas-liquid separation;
the second treatment measure is as follows: when producing CH in gas 4 When the content of the gas in the gas detection bin (31) is between a percent and b percent, the gas in the gas detection bin (31) enters through a control valve between the gas detection bin (31) and the feeding mixing bin (51)Feeding into a feed mixing bin (51) according to CO 2 Charging the actual concentration to prepare aerosol;
in addition, the secondary compression module (6) is utilized to supplement the gas in the gas detection bin (31) into the feeding mixing bin (51) for pressurization, and the gas is injected back through the injection pipeline (7) after being circularly pressurized and fed to form uniform and stable aerosol;
the third treatment measure: when producing CH in gas 4 When the content of the produced gas is below a%, the produced gas is directly pressurized and reinjected through the secondary compression module (6), or the development effect is further improved by adding a medicament through a second treatment measure;
the a% and the b% are preset values, and a is smaller than b.
9. The produced gas self-circulation trapping reinjection method according to claim 8, wherein: when producing CH in gas 4 When the content of (C) is more than b%, the gas is treated by the first measure, and CH in the gas detection bin (31) 4 When the content of the mixture reaches a percent to b percent, closing a control valve between a gas detection bin (31) and a combustion bin (41), opening the control valve between the gas detection bin (31) and a charging mixing bin (51), after the pressure value of a pressure sensor (100) is stable, closing the control valve between the gas detection bin (31) and the charging mixing bin (51), opening the control valve between the gas detection bin (31) and the combustion bin (41), and then preparing aerosol in the charging mixing bin (51) by utilizing a second treatment measure, and simultaneously continuing oxygen doping ignition and impurity removal of the mixed gas in the combustion bin (41);
And after the aerosol preparation in the feeding mixing bin (51) is finished, in the process of injecting the aerosol into the stratum, closing a control valve between the gas detection bin (31) and the feeding mixing bin (51), after the aerosol injection is finished, closing a control valve between the gas detection bin (31) and the combustion bin (41), opening the control valve between the gas detection bin (31) and the feeding mixing bin (51), supplementing gas into the feeding mixing bin (51), and repeating the process.
10. The produced gas self-circulation trapping reinjection method according to claim 8, wherein: in the second measure, the preparation method of the aerosol specifically comprises the following steps:
firstly, pressurizing and feeding mixed gas into a feeding mixing bin (51) by using a first-stage compression module (2), and simultaneously feeding the mixed gas into the feeding mixing bin (51) by using an atomization feeding device (52) to prepare aerosol, wherein in the preparation process, a medicament concentration sensor (200) is used for monitoring the medicament concentration in real time, and when the medicament concentration is unchanged, the medicament is dissolved in a gas phase to be saturated under the pressure of the first-stage compression module (2) to form stable aerosol;
then stopping the operation of the atomization feeding device (52), opening a control valve between the feeding mixing bin (51) and the outlet of the secondary compression module (6) and a control valve between the gas detection bin (31) and the inlet of the secondary compression module (6), supplementing gas to the feeding mixing bin (51) by using the primary compression module (2) and the secondary compression module (6), increasing the solubility of the medicament in the gas phase in the feeding mixing bin (51) after pressurization, restarting the atomization feeding device (52) for feeding, and closing the control valve between the gas detection bin (31) and the inlet of the secondary compression module (6) after the numerical values of the pressure sensor (100) and the medicament concentration sensor (200) are stable, namely, under the common pressure of the primary compression module (2) and the secondary compression module (6), the dissolution of the medicament in the gas phase reaches saturation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107575190A (en) * | 2017-09-25 | 2018-01-12 | 中国石油大学(华东) | One kind is based on optimal flue gas CO2The CCUS systems and its method of work of accumulation rate production of heavy oil reservoir |
| GB202100459D0 (en) * | 2021-01-14 | 2021-03-03 | Tigre Tech Limited | Closed circuit natural gas extraction and sequestration of carbon dioxide |
| CN114345098A (en) * | 2022-01-10 | 2022-04-15 | 浙江大学嘉兴研究院 | CO (carbon monoxide)2Method and system for trapping absorbent decomposition inhibition and efficient pollution reduction |
| CN114768512A (en) * | 2022-04-29 | 2022-07-22 | 浙江菲达环保科技股份有限公司 | CO for efficiently trapping secondary aerosol of absorbent2Absorption tower |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107575190A (en) * | 2017-09-25 | 2018-01-12 | 中国石油大学(华东) | One kind is based on optimal flue gas CO2The CCUS systems and its method of work of accumulation rate production of heavy oil reservoir |
| GB202100459D0 (en) * | 2021-01-14 | 2021-03-03 | Tigre Tech Limited | Closed circuit natural gas extraction and sequestration of carbon dioxide |
| CN114345098A (en) * | 2022-01-10 | 2022-04-15 | 浙江大学嘉兴研究院 | CO (carbon monoxide)2Method and system for trapping absorbent decomposition inhibition and efficient pollution reduction |
| CN114768512A (en) * | 2022-04-29 | 2022-07-22 | 浙江菲达环保科技股份有限公司 | CO for efficiently trapping secondary aerosol of absorbent2Absorption tower |
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