CN112316698A - Process method for removing hydrogen sulfide from oil production wellhead in foam isolation manner - Google Patents
Process method for removing hydrogen sulfide from oil production wellhead in foam isolation manner Download PDFInfo
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- hydrogen sulfide
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 71
- 239000006260 foam Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000002955 isolation Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000010779 crude oil Substances 0.000 claims abstract description 67
- 239000008258 liquid foam Substances 0.000 claims abstract description 46
- 239000000872 buffer Substances 0.000 claims abstract description 30
- 239000003921 oil Substances 0.000 claims abstract description 28
- 239000000126 substance Substances 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 238000005187 foaming Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 238000001802 infusion Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000004088 foaming agent Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 229910021386 carbon form Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 13
- 238000000605 extraction Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 5
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 239000003129 oil well Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- 230000003009 desulfurizing effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- 241000191291 Abies alba Species 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001411320 Eriogonum inflatum Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 239000009671 shengli Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000019086 sulfide ion homeostasis Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
Abstract
The invention relates to the field of removing harmful gas in oil exploitation, and discloses a process method for removing hydrogen sulfide from an oil extraction wellhead in a foam isolation manner, which comprises the following steps: covering a gas-liquid foam layer containing a chemical desulfurizer on the surface of the crude oil in the crude oil buffer tank to isolate the crude oil and air in the crude oil buffer tank, and eliminating hydrogen sulfide escaped from the crude oil in the gas-liquid foam layer by using the chemical desulfurizer to prevent the hydrogen sulfide from being discharged from the crude oil buffer tank and entering an atmospheric environment near a well site; the gas-liquid foam of the gas-liquid foam layer is prepared by blowing foaming or self-generating foaming. The invention has a wonderful idea across fields, creatively introduces the foam isolation fire extinguishing technology in the fire fighting field into the hydrogen sulfide removing technology of the well site in the oil exploitation field, fundamentally stops the leakage of hydrogen sulfide, and ensures that well site workers are prevented from being harmed; the consumption of desulfurizer at the oil extraction well mouth is greatly reduced; the problem of non-naphthalene well sealing caused by over standard of hydrogen sulfide is solved.
Description
Technical Field
The invention relates to the field of removing harmful gas in oil exploitation, in particular to a process method for removing hydrogen sulfide from an oil extraction wellhead in a foam isolation manner.
Background
During oil production, the mixed liquor of crude oil and water in the production well often contains hydrogen sulfide in varying concentrations. Hydrogen sulfide is a highly toxic gas; if the oil well construction leads to the leakage of hydrogen sulfide, atmospheric pollution can be caused.
After the crude oil is led out from the oil well, some crude oil directly enters the pipeline, and hydrogen sulfide gas cannot be leaked on the oil well construction site, so that the hydrogen sulfide removing process can be carried out by pushing the crude oil to a gathering and transportation station. A considerable number of oil wells are provided, produced liquid is not directly transported away through a pipeline during single-well oil extraction, but is injected into a normal-pressure buffer tank which is open to the atmosphere in a well site from a closed pressure pipeline and is stored for a period of time, and part of hydrogen sulfide escapes from crude oil to pollute the air in the oil extraction well site and harm the health of workers.
The existing commonly used technology for removing hydrogen sulfide at an oil extraction wellhead is to adopt a chemical desulfurization method before crude oil enters a buffer tank; according to the concentration of the hydrogen sulfide in the crude oil, a proper amount of chemical desulfurizer is added, so that the hydrogen sulfide separated out from the crude oil in the buffer tank is reduced as much as possible, the concentration of the hydrogen sulfide in a wellhead operation area is lower than the allowable concentration, and no harm is caused to operation workers.
The chemical desulfurizing agents commonly used at present mainly comprise the following chemical desulfurizing agents:
(1) hydroxide desulfurizing agent: the potassium hydroxide and the sodium hydroxide can effectively remove hydrogen sulfide in crude oil, but can form stable alkaline emulsion, and increase the difficulty of downstream dehydration. Ammonium hydroxide can also be used as a crude oil desulfurizer, ammonium salt generated by reaction is easier to remove than sodium salt and potassium salt, but ammonia gas is easy to volatilize at high temperature, and copper equipment parts of a well site are easy to corrode.
(2) A formaldehyde desulfurizer: the formaldehyde has good desulfurization effect, but the time is long, the reverse reaction occurs, and the hydrogen sulfide is regenerated. In addition, formaldehyde is a gas harmful to humans and also requires strict precautions.
(3) Strong oxide desulfurizing agent: hydrogen peroxide can well remove hydrogen sulfide in crude oil through oxidation, but hydrogen peroxide is easy to decompose under the condition of metal catalysis to generate oxygen and water and generate a large amount of heat; if the control is not good, explosion is easily caused.
(4) Nitrogen-based desulfurizing agent: at present, the triazine desulfurizer is commonly used, and the comprehensive effect is good.
The common desulfurizer is added at a well mouth, and is not added in an oil pipe/casing gap or an oil extraction pipe of a wellhead Christmas tree; because the operation is continuously carried out, the converging path of the desulfurizer and the crude oil is limited, and the time is short; even if the dispersant is added, ideal and sufficient mixing cannot be achieved, and hydrogen sulfide in the crude oil cannot be effectively removed. Therefore, some crude oil wells with high hydrogen sulfide concentration are difficult to treat, and some hydrogen sulfide is always volatilized due to insufficient amount of added desulfurizer or uneven mixing; it is more difficult to remove the well fluid if it has a particularly high hydrogen sulfide concentration. Many oil wells cost a lot of money, but because hydrogen sulfide exceeds standard, have to close it, cause the enormous waste. In addition, since the addition of the desulfurizing agent is a continuous process, the amount of the desulfurizing agent added is large in accumulation, and the cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a process method for removing hydrogen sulfide from an oil extraction wellhead in a foam isolation manner.
The technical scheme is as follows: covering a gas-liquid foam layer containing a chemical desulfurizer on the surface of the crude oil in the crude oil buffer tank to isolate the crude oil and air in the crude oil buffer tank, and eliminating hydrogen sulfide escaped from the crude oil in the gas-liquid foam layer by using the chemical desulfurizer to prevent the hydrogen sulfide from being discharged from the crude oil buffer tank and entering the atmospheric environment near a well site.
The above technical solution can be further optimized as follows:
the effective thickness of the gas-liquid foam layer is 10cm to 30 cm.
The gas-liquid foam of the gas-liquid foam layer is prepared by blowing foaming or self-generating foaming.
The air blowing type foaming is characterized in that compressed air is provided to an injection and suction pump by an air compressor, the injection and suction pump generates negative pressure to suck foaming agent containing chemical desulfurizer, air and liquid are mixed in the injection and suction pump and then flow into an air blowing type foam generator in a crude oil buffer tank, and fine air and liquid foam is formed by the air blowing type foam generator.
The self-generating foaming is to send two liquids into a self-generating foam generator respectively by an infusion pump, wherein one liquid contains sodium bicarbonate, the other liquid contains aluminum sulfate and a chemical desulfurizer, and the two liquids are subjected to chemical reaction in the air blowing foam generator to generate carbon dioxide and form fine gas-liquid foam.
The air content in the air-liquid foam layer is 90%.
The chemical desulfurizer adopts a nitrogen-based desulfurizer.
The nitrogen-based desulfurizer adopts triazabenzene.
Compared with the prior art, the invention mainly has the following beneficial technical effects:
1. the foam isolation fire extinguishing technology in the field of fire fighting is creatively introduced into the process technology for removing hydrogen sulfide in the well site in the field of oil exploitation to form a unique process for removing hydrogen sulfide in the well site foam isolation, so that the leakage of hydrogen sulfide is fundamentally avoided, and personnel in the well site are prevented from being harmed.
2. In the process of removing hydrogen sulfide by well site foam isolation, the half-life period of the foam can be maintained to be more than 5000 minutes, and the foam has good durability.
3. The target object for removing the hydrogen sulfide is completely removed from the whole produced liquid and is changed into the isolation removal of the surface of the produced liquid of the buffer tank, so that the using amount of a sulfur removal agent of an oil extraction wellhead is greatly reduced, the workload of crude oil dehydration cleaning in the later period is reduced, and the production cost is obviously reduced.
4. Aiming at the problem that the problem of non-naphthalene well shut-in caused by the fact that hydrogen sulfide cannot reach the standard when a part of oil wells with too much hydrogen sulfide in produced liquid are removed by adopting a chemical desulfurizer at present, a foam isolation removal method can be used for solving the problem.
5. The application range is wide, and besides well site application, when a tank truck is adopted to transport crude oil, foam isolation can be carried out in a vehicle-mounted oil tank so as to prevent hydrogen sulfide from leaking on the way of transportation.
Drawings
FIG. 1 is a schematic diagram of a comparative laboratory experiment of the present invention;
FIG. 2 is a schematic view of the blowing foaming process of the present invention;
FIG. 3 is a schematic view of the autogenous foaming process of the present invention;
in the figure: 1-a first flask, 2-gas-liquid foam, 3-crude oil, 4-a second flask, 5-a crude oil buffer tank, 6-a gas blowing type foam generator, 7-a gas-liquid transportation hose, 8-a jet suction pump, 9-a gas transportation hose, 10-an air compressor, 11-a liquid transportation pipe, 12-a foaming agent storage tank, 13-a self-generating gas type foam generator, 14-a first liquid transportation hose, 15-a first liquid infusion pump, 16-a first liquid storage tank, 17-a second liquid transportation hose, 18-a second liquid infusion pump and 19-a second liquid storage tank.
Detailed Description
The present invention will be described in detail below with reference to the following examples and accompanying drawings.
Example 1
See fig. 1, 2 and 3. The technical scheme of the process method for removing hydrogen sulfide from the oil production wellhead in a foam isolation way is as follows: covering a gas-liquid foam layer containing a chemical desulfurizer on the surface of the crude oil in the crude oil buffer tank 5 to isolate the crude oil and air in the crude oil buffer tank 5, and eliminating hydrogen sulfide escaping from the crude oil 3 in the gas-liquid foam layer by using the chemical desulfurizer to prevent the hydrogen sulfide from being discharged from the crude oil buffer tank 5 to enter the atmospheric environment near a well site.
Example 2
See fig. 1, 2 and 3. On the basis of the technical scheme recorded in the embodiment 1, the effective thickness of a gas-liquid foam layer is 10 cm-30 cm so as to achieve the purpose of effectively isolating hydrogen sulfide.
Example 3
See fig. 1, 2 and 3. The oil recovery well head foam isolation type hydrogen sulfide removing process method is based on the technical scheme recorded in the embodiment 2, and the gas-liquid foam 2 of the gas-liquid foam layer is prepared by blowing type foaming or self-generating type foaming.
Example 4
See fig. 1, 2 and 3. The process method for removing hydrogen sulfide from an oil extraction wellhead in a foam isolation manner comprises the following specific steps of air blowing type foaming on the basis of the technical scheme recorded in the embodiment 3: compressed air is provided to the injection and suction pump 8 by an air compressor 10, negative pressure is generated by the injection and suction pump 8 to suck foaming agent containing chemical desulfurizer, gas and liquid are mixed in the injection and suction pump 8 and then flow into the air blowing type foam generator 6 in the crude oil buffer tank 5, and fine gas and liquid foam 2 is formed by the air blowing type foam generator 6.
Example 5
See fig. 1, 2 and 3. The process method for removing hydrogen sulfide from an oil extraction wellhead in a foam isolation manner specifically comprises the following steps of: the two liquids are respectively sent into the self-gas-generating foam generator 13 by a liquid conveying pump, wherein one liquid contains sodium bicarbonate, the other liquid contains aluminum sulfate and a chemical desulfurizer, and the two liquids are subjected to chemical reaction in the self-gas-generating foam generator 13 to generate carbon dioxide and form fine gas-liquid foam 2.
Example 6
See fig. 1, 2 and 3. The oil recovery well head foam isolation type hydrogen sulfide removal process method is based on the technical scheme recorded in the embodiment 1-5, and the air content in the gas-liquid foam layer is 90% so as to achieve the best foam isolation effect.
Example 7
See fig. 1, 2 and 3. The oil recovery well head foam isolation type hydrogen sulfide removing process method is based on the technical scheme recorded in the embodiment 6, and the chemical desulfurizer adopts a nitrogen-based desulfurizer.
Example 8
See fig. 1, 2 and 3. The oil recovery well head foam isolation type hydrogen sulfide removing process method is based on the technical scheme recorded in the embodiment 7, and the nitrogen-based desulfurizer adopts triazabenzene.
The basic working principle of the invention is as follows:
the main contradiction of hydrogen sulfide generation in the single well oil production process is that when crude oil 3 flows into the crude oil buffer tank 5, the closed state is changed into an open state to the atmosphere, the pressure is reduced to normal pressure, the temperature is reduced, and when the content of hydrogen sulfide in the crude oil 3 is high, the hydrogen sulfide is emitted from the liquid level of the crude oil 3 in the crude oil buffer tank 5 and is emitted to a well site through a breathing hole of the crude oil buffer tank 5. The concentration of the well site hydrogen sulfide is detected in a breathing hole of a crude oil buffer tank 5. Other processes and parts are in a sealed state, and hydrogen sulfide cannot be leaked. According to the invention, the gas-liquid foam 2 containing the chemical desulfurizer is distributed on the surface of the crude oil 3 of the crude oil buffer tank 5, so that the crude oil 3 and air are well isolated, and meanwhile, the hydrogen sulfide escaping from the crude oil 3 is removed by the chemical desulfurizer, so that the hydrogen sulfide is ensured not to enter the atmosphere, and the pollution to the well site air is prevented.
When gas-liquid foam 2 is prepared by adopting gas blowing type foaming, air is conveyed to a jetting and sucking pump 8 by an air compressor 10, the jetting and sucking pump 8 generates negative pressure, liquid in a foaming agent storage tank 12 is sucked in through a liquid conveying pipe 11 and is mixed in the jetting and sucking pump 8, gas and liquid are mixed and then flow into a gas blowing type foam generator 6 in a crude oil buffer tank 5 through a gas-liquid conveying hose 7, the gas blowing type foam generator is covered on the upper surface of crude oil 3 in the crude oil buffer tank 5 after gas-liquid foam 2 is formed, when the upper limit of the thickness of the gas-liquid foam 2 is reached, the air compressor 10 is; starting the air compressor 10 to re-foam as the gas-liquid foam 2 continuously disappears to reach the lower limit of the thickness of the gas-liquid foam 2; the above process is continued to maintain the desired thickness of the gas-liquid foam 2.
When the self-generating foaming is adopted to prepare the gas-liquid foam, a first liquid (containing sodium bicarbonate) and a second liquid (containing aluminum sulfate and a chemical desulfurizer) are respectively pumped into a self-generating foam generator 13 through a first liquid pump 15 and a second liquid pump 18, the first liquid and the second liquid react to generate carbon dioxide, the formed gas-liquid foam 2 covers the upper surface of the crude oil 3 of the crude oil buffer tank 5, the upper limit of the thickness of the gas-liquid foam 2 is reached, the first liquid pump 15 and the second liquid pump 18 are cut off, and the foaming is suspended; starting the first infusion pump 15 and the second infusion pump 18 to re-foam when the gas-liquid foam 2 continuously disappears and reaches the lower limit of the thickness of the gas-liquid foam 2; the above process is continued to maintain the desired thickness of the gas-liquid foam 2.
To better illustrate the outstanding effects of the present invention, the laboratory and field test cases of the oil well are briefly described as follows:
1. laboratory experiments:
2. And (3) field test of an oil well:
on the oil well site of the Shengli oil field, aiming at the crude oil buffer tank 5, gas-blowing type foaming and self-generating type foaming are respectively adopted to prepare gas-liquid foam 2, and the thickness of the gas-liquid foam layer covered on the surface of crude oil 3 is 10 cm-30 cm. The results show that: the concentration of hydrogen sulfide in the air inside the crude oil buffer tank 5 is close to zero (cannot be detected); in addition, through measurement and calculation, compared with the prior art, the consumption of the chemical desulfurizer can be saved by 50-60%, and the cost for removing the hydrogen sulfide is greatly reduced.
Claims (8)
1. The process method for removing hydrogen sulfide from the oil production wellhead in a foam isolation manner is characterized by comprising the following steps of: covering a gas-liquid foam layer containing a chemical desulfurizer on the surface of the crude oil in the crude oil buffer tank to isolate the crude oil and air in the crude oil buffer tank, and eliminating hydrogen sulfide escaped from the crude oil in the gas-liquid foam layer by using the chemical desulfurizer to prevent the hydrogen sulfide from being discharged from the crude oil buffer tank and entering the atmospheric environment near a well site.
2. The process for foam isolated removal of hydrogen sulfide at a production wellhead as claimed in claim 1, wherein: the effective thickness of the gas-liquid foam layer is 10cm to 30 cm.
3. The process for foam isolated removal of hydrogen sulfide at a production wellhead according to claim 2, wherein: the gas-liquid foam of the gas-liquid foam layer is prepared by blowing foaming or self-generating foaming.
4. The process of foam isolated removal of hydrogen sulfide at a production wellhead as claimed in claim 3, wherein: the air blowing type foaming is characterized in that compressed air is provided to an injection and suction pump by an air compressor, the injection and suction pump generates negative pressure to suck foaming agent containing chemical desulfurizer, air and liquid are mixed in the injection and suction pump and then flow into an air blowing type foam generator in a crude oil buffer tank, and fine air and liquid foam is formed by the air blowing type foam generator.
5. The process of foam isolated removal of hydrogen sulfide at a production wellhead as claimed in claim 3, wherein: the self-generating foaming is to send two liquids into a self-generating foam generator respectively by an infusion pump, wherein one liquid contains sodium bicarbonate, the other liquid contains aluminum sulfate and a chemical desulfurizer, and the two liquids are subjected to chemical reaction in the air blowing foam generator to generate carbon dioxide and form fine gas-liquid foam.
6. The process for foam isolated removal of hydrogen sulfide at an oil recovery wellhead according to any of claims 1-5, characterized in that: the air content in the air-liquid foam layer is 90%.
7. The process of foam isolated removal of hydrogen sulfide at a production wellhead as claimed in claim 6, wherein: the chemical desulfurizer adopts a nitrogen-based desulfurizer.
8. The process for foam isolated removal of hydrogen sulfide at a production wellhead according to claim 7, wherein: the nitrogen-based desulfurizer adopts triazabenzene.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404465A (en) * | 2021-06-02 | 2021-09-17 | 陈湘红 | Auxiliary device for removing crude oil hydrogen sulfide by using foam separant after petroleum exploitation |
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