CN115404110A - Wellhead carbon dioxide recovery device - Google Patents
Wellhead carbon dioxide recovery device Download PDFInfo
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- CN115404110A CN115404110A CN202110578389.8A CN202110578389A CN115404110A CN 115404110 A CN115404110 A CN 115404110A CN 202110578389 A CN202110578389 A CN 202110578389A CN 115404110 A CN115404110 A CN 115404110A
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- dioxide recovery
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 372
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 186
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 186
- 238000011084 recovery Methods 0.000 title claims abstract description 41
- 238000010521 absorption reaction Methods 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 44
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 92
- 239000012530 fluid Substances 0.000 claims description 20
- 239000012224 working solution Substances 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000010924 continuous production Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 46
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 30
- 239000003513 alkali Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 description 14
- 239000007787 solid Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 8
- 238000000926 separation method Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 239000011734 sodium Substances 0.000 description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/104—Carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention provides a wellhead carbon dioxide recovery device which comprises a carbon dioxide absorption tank, a pump and a filter. The carbon dioxide absorption tank is filled with working liquid, the working liquid can react with carbon dioxide to generate carbonate, and the carbonate can react with hydrochloric acid to generate carbon dioxide. The carbon dioxide absorption tank is respectively provided with an air inlet, an air outlet and a liquid flow port. The pump is connected with the liquid flow port and the filter respectively. According to the wellhead carbon dioxide recovery device provided by the invention, the effective collection of carbon dioxide of a continuous production single well is realized through miniaturized and circulating equipment, and the carbon dioxide can be recovered again through chemical reaction for the next construction of the well, so that the problem of carbon dioxide recovery is solved, and the cost is reduced by recycling the carbon dioxide.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a wellhead carbon dioxide recovery device.
Background
Carbon dioxide plays an important role in the current oil-gas reservoir development due to the physical properties of the carbon dioxide, can effectively construct complex fractures in carbon dioxide fracturing, reduce viscosity in carbon dioxide displacement, carry out miscible phase displacement, and develop methane in hydrates in a displacement mode. Carbon dioxide has found good efficacy in many applications, but inevitably contained in the production at the time of well-opening. After gas-liquid separation, the carbon dioxide in the gas phase is recovered, so that on one hand, the emission of greenhouse gases is avoided, and on the other hand, the cost of carbon dioxide in one round of construction is reduced.
At present, the work of separating, recovering, adsorbing and the like of carbon dioxide is mostly concentrated in the industry fields of power generation, hydrogen production and the like, the adopted methods are mostly ammonia method (chemistry), flash evaporation, temperature (condensation) and the like, most of the processes are complex, large-scale equipment such as a separating tower and the like are needed, and a carbon dioxide recovery device aiming at the development field of oil and gas fields is not available.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the wellhead carbon dioxide recovery device, which is used for effectively collecting carbon dioxide of a continuous production single well through miniaturized and circulating equipment, and can recover the carbon dioxide again for the next construction of the well through chemical reaction, so that the problem of carbon dioxide recovery is solved, and the cost is reduced by recycling the carbon dioxide.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a wellhead carbon dioxide recovery device comprises a carbon dioxide absorption tank, a pump and a filter. The carbon dioxide absorption tank is filled with working liquid, the working liquid can react with carbon dioxide to generate carbonate, and the carbonate can react with hydrochloric acid to generate carbon dioxide. The carbon dioxide absorption tank is respectively provided with an air inlet, an air outlet and a liquid flow port. The pump is connected with the liquid flow port and the filter respectively.
According to the wellhead carbon dioxide recovery device, the working fluid can react with carbon dioxide to generate carbonate and the carbonate is left in the working fluid, so that the carbon dioxide in the gas generated by the wellhead can be absorbed by the working fluid, the working fluid is pumped into the filter from the carbon dioxide absorption tank under the action of the pump, the carbonate can be effectively collected after flowing out of the filter, the carbon dioxide can be fixed and recovered, and the working fluid can be recovered to the carbon dioxide absorption tank again to form continuous liquid circulation. And the whole recovery device has simple structure and small volume, and is convenient to install and operate.
For the above technical solution, further improvements can be made as described below.
According to the wellhead carbon dioxide recovery device, in a preferred embodiment, an air inlet manifold is arranged in the carbon dioxide absorption tank.
The output gas enters through the air inlet of the carbon dioxide absorption tank and enters the working fluid through the air inlet manifold, the gas after the carbon dioxide is adsorbed moves to the upper part and is discharged through the air outlet, the air inlet manifold is set to improve the gas-liquid contact area, the reaction efficiency is improved, and the adsorption effect of the carbon dioxide is improved.
Further, in a preferred embodiment, the intake manifold is provided at the bottom of the carbon dioxide absorbing tank.
The whole bottom that is located the absorption tank of air intake manifold, aim at, gas gets into liquid back, improves the distance that the bubble shifts up in the working solution, increases gas-liquid contact time, the reaction time of carbon dioxide and alkali lye promptly, is favorable to improving the absorption effect of carbon dioxide.
Further, in a preferred embodiment, the intake manifolds are arranged in an array of at least two rows and two columns.
The gas inlet manifold is designed into a plurality of groups of arrangement forms, such as 9 multiplied by 14 arrangement (further adjustment can be carried out under actual conditions), compared with a single liquid inlet pipeline, the contact area can be increased by hundreds of times, the gas-liquid reaction time can be shortened by hundreds of times, and the carbon dioxide absorption efficiency is greatly improved.
Further, in a preferred embodiment, the end of the intake manifold is provided with a one-way valve.
The tail end of the air inlet manifold is provided with a one-way valve, so that the influence of working solution backflow on the carbon dioxide absorption efficiency in the working process of the recovery device can be effectively avoided.
Specifically, in a preferred embodiment, the check valve comprises a valve seat, a valve ball and a stopper, wherein the valve ball is seated on the valve seat under the action of hydraulic pressure, and the valve ball leaves the valve seat and stays at the position of the stopper under the pushing of air pressure.
Specifically, in the initial state, the valve ball is seated on the valve seat under the hydraulic action, and the intake manifold is in the closed state at the moment. After the produced gas enters, the valve ball leaves the valve seat and stays at the position of the limiting stopper under the pushing of the air pressure, the check valve is opened at the moment, and the gas enters the liquid of the carbon dioxide absorption tank, so that the absorption process of the carbon dioxide is stable and reliable.
Further, in a preferred embodiment, the filter is connected to the flow port by a circulation conduit.
The carbonate that filters out through the filter has realized fixing and retrieving gaseous carbon dioxide after collecting, accessible hydrochloric acid reaction reachs carbon dioxide again in the construction of next well time, realizes carbon dioxide's cyclic utilization, reduces carbon dioxide's purchase cost, simultaneously, realizes the working solution circulation through the circulating line, filters out the sodium carbonate solid that separates out on the one hand, and on the other hand continuously adds the sodium hydroxide medicament, keeps the absorbing capacity of working solution to carbon dioxide.
In particular, in a preferred embodiment, the working liquid comprises a NaOH solution.
The working solution is NaOH alkali solution and can react with carbon dioxide to generate Na 2 CO 3 And the working fluid is left in the working fluid, so that the working fluid can absorb carbon dioxide in gas produced by the well head. In the circulating process of the working solution, the solubility of a byproduct sodium carbonate generated by absorbing carbon dioxide is far lower than that of sodium hydroxide, so that the sodium carbonate can be separated out when the sodium hydroxide in the working solution is not reacted. In circulation, the precipitated sodium carbonate enters a filter along with liquid flow, dehydrated sodium carbonate solid is obtained after solid-liquid separation, and the working solution returns to the absorption tank through circulation. Sodium hydroxide powder can be gradually added in the circulating process to keep the absorption effect on carbon dioxide.
Specifically, in a preferred embodiment, the ratio of carbon dioxide to sodium hydroxide is 1.
According to the reaction equation: CO 2 2 +2NaOH＝Na 2 CO 3 +H 2 And O, about 1.84t of sodium hydroxide is needed for absorbing 1t of carbon dioxide, so that the using amount of the sodium hydroxide can be analyzed and calculated according to the gas output and the estimated carbon dioxide concentration, and the absorption effect of the carbon dioxide can be ensured to the greatest extent.
Specifically, in a preferred embodiment, the gas inlet and the liquid outlet are symmetrically arranged on two sides of the carbon dioxide absorption tank near the bottom, and the gas outlet is arranged on the top of the carbon dioxide absorption tank.
The air inlet and the liquid flow port are respectively arranged at the bottom of the tank body, the air outlet is arranged at the top of the tank body, so that the installation and the arrangement of the whole structure are facilitated, and the occupied space is reduced.
Compared with the prior art, the invention has the advantages that: the carbon dioxide of the continuous production single well is effectively collected through miniaturization and circulation type equipment, the carbon dioxide can be recycled through chemical reaction for construction of the next well, the problem of carbon dioxide recovery is solved, and the cost is reduced by recycling the carbon dioxide.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 schematically illustrates the overall structure of a wellhead carbon dioxide recovery device of an embodiment of the present invention;
FIG. 2 schematically illustrates a side view of a wellhead carbon dioxide recovery device of an embodiment of the present invention;
FIG. 3 schematically illustrates a front view of a wellhead carbon dioxide recovery device of an embodiment of the present invention;
fig. 4 schematically shows the internal structure of the intake manifold in the embodiment of the invention.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
FIG. 1 schematically illustrates the overall structure of a wellhead carbon dioxide recovery device 10 in accordance with an embodiment of the present invention. FIG. 2 schematically illustrates a side view configuration of a wellhead carbon dioxide recovery device 10 of an embodiment of the present invention. FIG. 3 schematically illustrates a front view of a wellhead carbon dioxide recovery device 10 of an embodiment of the present invention. Fig. 4 schematically shows the internal structure of the intake manifold 4 in the embodiment of the invention.
As shown in fig. 1 to 3, a wellhead carbon dioxide recovery device 10 according to an embodiment of the present invention includes a carbon dioxide absorption tank 1, a pump 2 and a filter 3. The carbon dioxide absorption tank 1 is filled with working fluid 14, the working fluid 14 can react with carbon dioxide to generate carbonate, and the carbonate can react with hydrochloric acid to generate carbon dioxide. The carbon dioxide absorption tank 1 is provided with an air inlet 11, an air outlet 12 and a liquid flow port 13. The pump 2 is connected to the liquid flow port 13 and the filter 3, respectively.
According to the wellhead carbon dioxide recovery device provided by the embodiment of the invention, the working fluid can react with carbon dioxide to generate carbonate and the carbonate is remained in the working fluid, so that the carbon dioxide in the gas generated by the wellhead can be absorbed by the working fluid, the working fluid is pumped into the filter from the carbon dioxide absorption tank under the action of the pump, the carbonate can be effectively collected after flowing out of the filter, the carbon dioxide can be fixed and recovered, and the working fluid can be recovered and returned to the carbon dioxide absorption tank again to form continuous liquid circulation. Moreover, the whole recovery device has simple structure, small volume and convenient installation and operation.
Further, in the present embodiment, as shown in fig. 1, the filter 3 is connected to the liquid flow port 13 through the circulation pipe 6. The carbonate that filters out through the filter has realized fixing and retrieving gaseous carbon dioxide after collecting, accessible hydrochloric acid reaction reachs carbon dioxide in the construction of next well time again, realizes carbon dioxide's cyclic utilization, reduces carbon dioxide's purchase cost, simultaneously, realizes the working solution circulation through the circulating line, filters out the sodium carbonate solid that separates out on the one hand, and on the other hand continuously adds the sodium hydroxide medicament, keeps the absorbing capacity of working solution to carbon dioxide.
As shown in fig. 1 to 3, specifically, in the present embodiment, the gas inlet 11 and the liquid flow port 13 are symmetrically arranged on both sides of the carbon dioxide absorption tank 1 near the bottom, respectively, and the gas outlet 12 is located on the top of the carbon dioxide absorption tank 1. The air inlet and the liquid flow port are respectively arranged at the bottom of the tank body, and the air outlet is arranged at the top of the tank body, so that the whole structure is convenient to install and arrange, and the occupied space is reduced.
As shown in fig. 2 and 3, further, in the present embodiment, an intake manifold 4 is provided in the carbon dioxide absorbing tank 1. The output gas enters through the air inlet of the carbon dioxide absorption tank and enters the working fluid through the air inlet manifold, the gas after the carbon dioxide is adsorbed moves to the upper part and is discharged through the air outlet, the air inlet manifold is set to improve the gas-liquid contact area, the reaction efficiency is improved, and the adsorption effect of the carbon dioxide is improved. Further, in the present embodiment, the intake manifold 4 is provided at the bottom of the carbon dioxide absorbing tank 1. The whole bottom that is located the absorption tank of air intake manifold, aim at, gas gets into liquid back, improves the distance that the bubble shifts up in the working solution, increases gas-liquid contact time, the reaction time of carbon dioxide and alkali lye promptly, is favorable to improving the absorption effect of carbon dioxide. Preferably, in the present embodiment, the intake manifolds 4 are arranged in an array of at least two rows and two columns. The gas inlet manifold is designed into a plurality of groups of arrangement forms, such as 9 multiplied by 14 arrangement (further adjustment can be carried out under actual conditions), compared with a single liquid inlet pipeline, the contact area can be increased by hundreds of times, the gas-liquid reaction time can be shortened by hundreds of times, and the carbon dioxide absorption efficiency is greatly improved. Preferably, as shown in fig. 2, the intake manifold 4 is disposed in an upwardly inclined manner, so that the gas-liquid reaction time period can be further increased, and the carbon dioxide absorption effect can be improved.
Further, as shown in fig. 3, in the present embodiment, the end of the intake manifold 4 is provided with a check valve 5. The tail end of the air inlet manifold is provided with a one-way valve, so that the influence of working solution backflow on the carbon dioxide absorption efficiency in the working process of the recovery device can be effectively avoided. Specifically, in the present embodiment, the check valve 5 includes a valve seat 51, a valve ball 52 and a stopper 53, the valve ball 52 is seated on the valve seat 51 under the hydraulic action, and the valve ball 52 is pushed by the air pressure to leave the valve seat 51 and stay at the position of the stopper 53. Specifically, in the initial state, the valve ball is seated on the valve seat under the hydraulic action, and the intake manifold is in the closed state at the moment. After the produced gas enters, the valve ball leaves the valve seat and stays at the position of the limiter under the pushing of the air pressure, the check valve is opened at the moment, and the gas enters the liquid of the carbon dioxide absorption tank, so that the absorption process of the carbon dioxide is stable and reliable.
Specifically, in the present embodiment, the working fluid 14 includes a NaOH solution. The working solution is NaOH alkaline solution, and can react with carbon dioxide to generate Na 2 CO 3 And the carbon dioxide is remained in the working solution, so that the working solution can absorb the carbon dioxide in the gas produced by the wellhead. In the circulating process of the working solution, the solubility of the byproduct sodium carbonate generated by absorbing carbon dioxide is far lower than that of sodium hydroxide, so that the sodium carbonate can be separated out when the sodium hydroxide in the working solution is not reacted. In circulation, the precipitated sodium carbonate enters a filter along with liquid flow, dehydrated sodium carbonate solid is obtained after solid-liquid separation, and the working solution returns to the absorption tank through circulation. Sodium hydroxide powder can be gradually added in the circulating process to keep the absorption effect on carbon dioxide. Specifically, in the present embodiment, the ratio of the amount of carbon dioxide to sodium hydroxide is 1. According to the reaction equation: CO 2 2 +2NaOH＝Na 2 CO 3 +H 2 And O, about 1.84t of sodium hydroxide is needed for absorbing 1t of carbon dioxide, so that the using amount of the sodium hydroxide can be analyzed and calculated according to the gas output and the estimated carbon dioxide concentration, and the absorption effect of the carbon dioxide can be ensured to the greatest extent.
The following is a specific development case of a wellhead carbon dioxide recovery unit 10 employing an embodiment of the present invention:
(1) Hydrate development case
The hydrate is exploited in the Zhongpetrochemical Shenhu gas field by carbon dioxide displacement. And (3) injecting carbon dioxide at the initial stage, and after the replacement is finished, opening the well for production, wherein due to the development of a replacement method, part of injected carbon dioxide is carried with hydrate in the gas production process and is developed together.
When the carbon dioxide recovery device reaches the ground (or platform), simple gas-liquid separation is firstly carried out, and then the gas produced by the wellhead enters the wellhead carbon dioxide recovery device 10 of the embodiment of the invention through pipeline connection.
The pipeline is firstly connected into a carbon dioxide absorption tank, and the tank is filled with prepared saturated alkali liquor (NaOH); and simultaneously starting a pump to circulate the alkali liquor.
The gas production pipeline becomes the intake manifold structure when connecting the carbon dioxide absorption tank, and every intake manifold end is equipped with the check valve, realizes the one-way flow of air current, prevents simultaneously that alkali lye from flowing back gets into the gas production pipeline.
After the gas enters the carbon dioxide absorption tank through the gas inlet manifold, the carbon dioxide in the bubbles reacts with the alkali liquor to generate sodium carbonate which is reserved in the alkali liquor, and the hydrate (methane) without the carbon dioxide enters the upper part of the carbon dioxide absorption tank and is converged out through the gas outlet.
Along with the gradual increase of the absorption amount of the carbon dioxide, the content of the sodium carbonate in the alkali liquor is gradually increased until the saturation degree is reached, and solid precipitation occurs. And (3) the circulating liquid enters a filter to realize solid-liquid separation, and the solid sodium carbonate is separately collected.
Meanwhile, the carbon dioxide content of the produced gas can be monitored at a wellhead, the volume of the produced carbon dioxide can be determined according to the gas production amount and converted into mass, and meanwhile, the carbon dioxide pre-metering in a future period of time can be predicted, and corresponding sodium hydroxide powder is prepared. The mass ratio of carbon dioxide to sodium hydroxide was about 1.84.
At this point, the hydrate that is pooled in the gathering line has been decarbonated. The carbon dioxide is solidified into solid sodium bicarbonate at the wellhead, and the solid sodium bicarbonate can be added with acid for secondary collection of gaseous carbon dioxide at the later stage for carbon dioxide replacement development of the next well or round, so that the recycling of the carbon dioxide is realized, and the workload of hydrate purification in the next link is reduced.
(2) Carbon dioxide fracturing development case
And carrying out reservoir transformation on a shale oil reservoir between the mesopetrochemical potential river salt by adopting a carbon dioxide fracturing method. And (4) carrying out well stewing after fracturing, and opening the well for production after most of carbon dioxide is absorbed. Due to the adoption of carbon dioxide fracturing, the produced substances are necessarily accompanied with the carrying-out and precipitation of carbon dioxide.
When the produced substances reach the ground, simple gas-liquid separation is firstly carried out, and then the produced gas at the wellhead enters the wellhead carbon dioxide recovery device 10 of the embodiment of the invention through pipeline connection.
The pipeline is firstly connected into a carbon dioxide absorption tank, and the tank is filled with prepared saturated alkali liquor (NaOH); and simultaneously starting a pump to circulate the alkali liquor.
The gas production pipeline becomes the intake manifold structure when connecting the carbon dioxide absorption tank, and every intake manifold end is equipped with the check valve device, realizes the one-way flow of air current, prevents simultaneously that alkali lye from flowing back gets into the gas production pipeline.
After the gas enters the carbon dioxide absorption tank through the gas inlet manifold, the carbon dioxide in the bubbles reacts with the alkali liquor to generate sodium carbonate which is reserved in the alkali liquor, and the product (gas state, such as associated gas) without the carbon dioxide enters the upper part of the carbon dioxide absorption tank and is collected out through the gas outlet.
Along with the gradual increase of the absorption amount of the carbon dioxide, the content of the sodium carbonate in the alkali liquor is gradually increased until the saturation degree is reached and solid precipitation occurs. And (3) the circulating liquid enters a filter to realize solid-liquid separation, and the solid sodium carbonate is separately collected.
Meanwhile, the carbon dioxide content of the produced gas can be monitored at a wellhead, the volume of the produced carbon dioxide can be determined according to the gas production amount and converted into mass, and meanwhile, the carbon dioxide pre-metering in a future period of time can be predicted, and corresponding sodium hydroxide powder is prepared. The mass ratio of carbon dioxide to sodium hydroxide was about 1:1.84. Considering that the carbon dioxide content is extremely high in the open flow process, the dosage of the sodium hydroxide powder is large in the initial stage, the carbon dioxide content is decreased gradually in the later stage, and the dosage of the sodium hydroxide is gradually reduced.
The output to the gathering line has now been decarbonated. The carbon dioxide is solidified into solid sodium bicarbonate at the well mouth, and the solid sodium bicarbonate can be added with acid for secondary collection of gaseous carbon dioxide at the later stage, so that the gaseous carbon dioxide can be used for the carbon dioxide fracturing or displacement development of the next well or round, and the recycling of the carbon dioxide can be realized.
According to the embodiment, the wellhead carbon dioxide recovery device provided by the invention can effectively collect carbon dioxide of a continuous production single well through miniaturized and circulating equipment, and can recover carbon dioxide again through chemical reaction for the next construction of a well, namely, the problem of carbon dioxide recovery is solved, and the cost is reduced by recycling the carbon dioxide.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A wellhead carbon dioxide recovery device is characterized by comprising a carbon dioxide absorption tank, a pump and a filter; wherein,
the carbon dioxide absorption tank is filled with working solution which can react with carbon dioxide to generate carbonate, and the carbonate can react with hydrochloric acid to generate carbon dioxide;
the carbon dioxide absorption tank is respectively provided with an air inlet, an air outlet and a liquid flow port;
the pump is connected to the fluid port and the filter, respectively.
2. A wellhead carbon dioxide recovery device as claimed in claim 1, wherein an air intake manifold is provided within the carbon dioxide absorption tank.
3. A wellhead carbon dioxide recovery device according to claim 1, wherein the inlet manifold is provided at the bottom of the carbon dioxide absorption tank.
4. A wellhead carbon dioxide recovery device according to claim 2 or claim 3, characterised in that the inlet manifolds are arranged in an array of at least two rows and two columns.
5. A wellhead carbon dioxide recovery device as claimed in claim 2 or claim 3, wherein the inlet manifold terminates with a one-way valve.
6. A wellhead carbon dioxide recovery device as claimed in claim 5, wherein the one-way valve comprises a valve seat, a valve ball and a stopper, the valve ball is seated on the valve seat under the hydraulic action, and the valve ball leaves the valve seat and stays at the stopper under the pushing of air pressure.
7. A wellhead carbon dioxide recovery device according to any of claims 1 to 3, characterized in that said filter is connected to said flow port by a circulation conduit.
8. A wellhead carbon dioxide recovery device as claimed in any of claims 1 to 3, wherein the working fluid comprises NaOH solution.
9. A wellhead carbon dioxide recovery device as claimed in claim 6, characterised in that the ratio of carbon dioxide to sodium hydroxide usage is 1.
10. A wellhead carbon dioxide recovery device as claimed in any of claims 1 to 3, wherein the gas inlet and the liquid flow port are symmetrically arranged on the carbon dioxide absorption tank near the bottom of the tank, and the gas outlet is located at the top of the tank.
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| CN202110578389.8A CN115404110A (en) | 2021-05-26 | 2021-05-26 | Wellhead carbon dioxide recovery device |
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|---|---|---|---|---|
| GB2057411A (en) * | 1979-08-16 | 1981-04-01 | Otto & Co Gmbh Dr C | Process for the removal of hydrogen sulphide from gases |
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