CN113236201A - Dry ice sublimation vapor-phase pressure injection process - Google Patents
Dry ice sublimation vapor-phase pressure injection process Download PDFInfo
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- CN113236201A CN113236201A CN202110564039.6A CN202110564039A CN113236201A CN 113236201 A CN113236201 A CN 113236201A CN 202110564039 A CN202110564039 A CN 202110564039A CN 113236201 A CN113236201 A CN 113236201A
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- dry ice
- carbon dioxide
- gas
- ice sublimation
- vapor phase
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 263
- 235000011089 carbon dioxide Nutrition 0.000 title claims abstract description 91
- 238000000859 sublimation Methods 0.000 title claims abstract description 66
- 230000008022 sublimation Effects 0.000 title claims abstract description 66
- 238000002347 injection Methods 0.000 title claims abstract description 50
- 239000007924 injection Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012808 vapor phase Substances 0.000 title claims description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 86
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 86
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000003303 reheating Methods 0.000 claims abstract description 4
- 239000012071 phase Substances 0.000 claims description 54
- 230000003139 buffering effect Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005485 electric heating Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 8
- 230000001965 increasing effect Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 239000003129 oil well Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 25
- 239000003921 oil Substances 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 3
- 239000007792 gaseous phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a dry ice sublimation gas phase pressure injection process, which relates to the technical field of oil displacement of carbon dioxide in oil fields and comprises the following steps: after being transported to a gas injection site by dry ice, the gas phase carbon dioxide is formed by heating, sublimating, reheating and compressing, and then is injected into a gas injection well. The problem of "the region is wide, the source is converged can not effectively be matched, liquid carbon dioxide transport distance is far away and can't use the oil field of tank wagon tanker transportation, use current liquid carbon dioxide pressure to annotate the technique and can't carry out on-the-spot dry ice sublimation pressure and annotate" is solved, and the oil well moisture content is showing and is descending, and the yield-increasing effect is obvious.
Description
Technical Field
The invention relates to the technical field of oil displacement by carbon dioxide in oil fields, in particular to a dry ice sublimation gas phase pressure injection process.
Background
The carbon dioxide flooding technology is a technology for injecting carbon dioxide into an oil layer to improve the oil recovery rate of an oil field. The carbon dioxide cannot form a miscible phase when the carbon dioxide is firstly contacted with the crude oil of the stratum, but under the conditions of proper pressure, temperature and crude oil components, the carbon dioxide can form a miscible phase front, and the supercritical fluid extracts heavier hydrocarbon from the crude oil and continuously concentrates gas at the displacement front, so that the carbon dioxide and the crude oil are changed into miscible liquid to form a single liquid phase, and the crude oil of the stratum can be effectively displaced to a production well.
In the existing oil field carbon dioxide flooding technology, the liquid phase carbon dioxide pressure injection technology is most widely applied. The liquid-phase carbon dioxide transportation is divided into two modes of pipeline transportation and tank car and ship transportation, the pipeline transportation investment is large, the construction period is long, the transportation of the tank car is greatly restricted by the geographical environment, the single transportation amount of the tank car is small, and the tank car is suitable for well groups which are close to the gas source. If an oil field with wide area, source-sink incapability of being effectively matched and long liquid carbon dioxide transportation distance exists, carbon dioxide cannot be injected effectively to improve the oil reservoir recovery ratio.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a dry ice sublimation vapor pressure injection process, so as to solve the problems proposed in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a dry ice sublimation vapor phase pressure injection process comprises the following steps: and after the dry ice is transported to a gas injection site, gas-phase carbon dioxide is formed by heating, sublimating, reheating and compressing, and then the gas-phase carbon dioxide is injected into a gas injection well.
As a further scheme of the invention: the method comprises the following specific steps:
s1, transporting the dry ice to a gas injection site;
s2, conveying the dry ice to a pre-feeding box through an automatic conveyor;
s3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor through a screw feeder to sublimate;
s4, discharging the sublimated gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, and heating the gas-phase carbon dioxide in a gasifier;
s5, feeding the heated gas-phase carbon dioxide into a carbon dioxide buffer tank for buffering;
and S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, and injecting the gas into a gas injection well after four-stage pressure boosting and four-stage temperature reduction.
As a further scheme of the invention: the feeding speed of the precession type feeder is 0-10 t/h.
As a further scheme of the invention: the dry ice sublimation reactor is a closed reaction container.
As a further scheme of the invention: an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor and are installed according to a certain mode.
As a further scheme of the invention: the gasifier heats the gaseous carbon dioxide to above 35 ℃.
As a further scheme of the invention: the carbon dioxide buffer tank ensures that the pressure of carbon dioxide entering the gas phase compressor is 0.1-0.3 MPa and the temperature is above 35 ℃.
As a further scheme of the invention: the pressure of the gas-phase carbon dioxide after four-stage pressure increasing and four-stage temperature reducing is increased to 25MPa at most.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, after the dry ice is transported to a gas injection site, the gas-phase carbon dioxide is formed through a series of steps of heating, sublimating, reheating and compressing, and then is injected into a gas injection well, so that the problems that the oil field is wide in region, source convergence cannot be effectively matched, the liquid carbon dioxide transportation distance is long, the oil field cannot be transported by a tank car and a tank ship, and the dry ice sublimating pressure injection on the site cannot be carried out by using the existing liquid carbon dioxide pressure injection technology are solved, the water content of the oil well is obviously reduced, and the yield increasing effect is obvious.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A dry ice sublimation vapor phase pressure injection process comprises the following steps:
and S1, transporting the dry ice to an air injection site.
And S2, conveying the dry ice to a pre-feeding box through an automatic conveyor.
And S3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor for sublimation through a screw feeder, wherein the feeding speed of the screw feeder is 8t/h, the dry ice sublimation reactor is a closed reaction container, and an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor.
And S4, discharging the sublimed gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, heating the gas-phase carbon dioxide in a gasifier to 35 ℃.
And S5, buffering the heated gas-phase carbon dioxide in a carbon dioxide buffer tank to 0.1 MPa.
And S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, boosting the pressure of the gas-phase carbon dioxide to 20MPa after four-stage boosting and four-stage cooling, and injecting the gas-phase carbon dioxide into a gas injection well.
Example 2
A dry ice sublimation vapor phase pressure injection process comprises the following steps:
and S1, transporting the dry ice to an air injection site.
And S2, conveying the dry ice to a pre-feeding box through an automatic conveyor.
And S3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor for sublimation through a screw feeder, wherein the feeding speed of the screw feeder is 8t/h, the dry ice sublimation reactor is a closed reaction container, and an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor.
And S4, discharging the sublimed gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, heating the gas-phase carbon dioxide in a gasifier to 36 ℃.
And S5, buffering the heated gas-phase carbon dioxide in a carbon dioxide buffer tank to 0.15 MPa.
And S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, boosting the pressure of the gas-phase carbon dioxide to 21MPa after four-stage boosting and four-stage cooling, and injecting the gas-phase carbon dioxide into a gas injection well.
Example 3
A dry ice sublimation vapor phase pressure injection process comprises the following steps:
and S1, transporting the dry ice to an air injection site.
And S2, conveying the dry ice to a pre-feeding box through an automatic conveyor.
And S3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor for sublimation through a screw feeder, wherein the feeding speed of the screw feeder is 8t/h, the dry ice sublimation reactor is a closed reaction container, and an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor.
And S4, discharging the sublimed gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, heating the gas-phase carbon dioxide in a gasifier to 37 ℃.
And S5, buffering the heated gas-phase carbon dioxide in a carbon dioxide buffer tank to 0.2 MPa.
And S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, boosting the pressure of the gas-phase carbon dioxide to 22MPa after four-stage boosting and four-stage cooling, and injecting the gas-phase carbon dioxide into a gas injection well.
Example 4
A dry ice sublimation vapor phase pressure injection process comprises the following steps:
and S1, transporting the dry ice to an air injection site.
And S2, conveying the dry ice to a pre-feeding box through an automatic conveyor.
And S3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor for sublimation through a screw feeder, wherein the feeding speed of the screw feeder is 5t/h, the dry ice sublimation reactor is a closed reaction container, and an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor.
And S4, discharging the sublimed gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, heating the gas-phase carbon dioxide in a gasifier to 39 ℃.
And S5, buffering the heated gas-phase carbon dioxide in a carbon dioxide buffer tank to 0.25 MPa.
And S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, boosting the pressure of the gas-phase carbon dioxide to 23MPa after four-stage boosting and four-stage cooling, and injecting the gas-phase carbon dioxide into a gas injection well.
Example 5
A dry ice sublimation vapor phase pressure injection process comprises the following steps:
and S1, transporting the dry ice to an air injection site.
And S2, conveying the dry ice to a pre-feeding box through an automatic conveyor.
And S3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor for sublimation through a screw feeder, wherein the feeding speed of the screw feeder is 5t/h, the dry ice sublimation reactor is a closed reaction container, and an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor.
And S4, discharging the sublimed gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, heating the gas-phase carbon dioxide in a gasifier to 40 ℃.
And S5, buffering the heated gas-phase carbon dioxide in a carbon dioxide buffer tank to 0.28 MPa.
And S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, boosting the pressure of the gas-phase carbon dioxide to 24MPa after four-stage boosting and four-stage cooling, and injecting the gas-phase carbon dioxide into a gas injection well.
Example 6
A dry ice sublimation vapor phase pressure injection process comprises the following steps:
and S1, transporting the dry ice to an air injection site.
And S2, conveying the dry ice to a pre-feeding box through an automatic conveyor.
And S3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor for sublimation through a screw feeder, wherein the feeding speed of the screw feeder is 10t/h, the dry ice sublimation reactor is a closed reaction container, and an electric heating coil and a partition plate are arranged in the dry ice sublimation reactor.
And S4, discharging the sublimed gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, heating the gas-phase carbon dioxide in a gasifier to 41 ℃.
And S5, buffering the heated gas-phase carbon dioxide in a carbon dioxide buffer tank to 0.3 MPa.
And S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, boosting the pressure of the gas-phase carbon dioxide to 25MPa after four-stage boosting and four-stage cooling, and injecting the gas-phase carbon dioxide into a gas injection well.
And (5) determining dry ice sublimation vapor phase pressure injection parameters.
Carrying out thin film vapor phase transformation on the obtained product, wherein the inlet pressure of the compressor is 0.1-0.3 MPa, and the density of the corresponding gaseous carbon dioxide is 1.787 kg/m-5.361 kg/m for carrying out thin film vapor phase transformation; carrying out heavy planting at 145-288 m/h on the discharge capacity of the compressor; utilize dry ice sublimation gaseous phase pressure to annotate technology of embodiment 3 to confirm dry ice sublimation gaseous phase pressure and annotate parameter, calculate through the formula under the condition of 0.1MPa, 288m year/h, the heat Qs that the dry ice sublimation absorbed per hour is 82kW, and carbon dioxide gas intensifies and needs the heat Qg that absorbs per hour is 9.15kW, finally reachs that dry ice sublimation reactor need the heat Q that provides per hour be 91.15 kW.
| Q=Qs+Qg （1） |
| Qs=Qh*qv*ρc （2） |
| Qg=Cp*qv*ρc*△tc （3） |
Wherein:
in summary, the following steps: the invention provides a dry ice sublimation vapor phase pressure injection process taking dry ice as a raw material, wherein the whole set of equipment continuously and stably operates for 120 hours, sublimes dry ice for 60t, and accumulatively injects vapor phase carbon dioxide for 3 ten thousand cubic meters, the whole set of process operates smoothly, and the dry ice sublimation vapor phase pressure injection technology is successfully realized. After the well is completed by soaking and the well is produced, the water content of the oil well is reduced to 78% from 95%, the daily oil production is increased to 3.08t/d from 0.6t/d, the daily oil increase is 2.48t, and the yield increase effect is obvious.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A dry ice sublimation vapor phase pressure injection process is characterized by comprising the following steps: and after the dry ice is transported to a gas injection site, gas-phase carbon dioxide is formed by heating, sublimating, reheating and compressing, and then the gas-phase carbon dioxide is injected into a gas injection well.
2. A dry ice sublimation vapor phase pressure injection process according to claim 1, characterized by comprising the following specific steps:
s1, transporting the dry ice to a gas injection site;
s2, conveying the dry ice to a pre-feeding box through an automatic conveyor;
s3, putting the dry ice in the pre-feeding box into a dry ice sublimation reactor through a screw feeder to sublimate;
s4, discharging the sublimated gas-phase carbon dioxide from an outlet at the upper part of the dry ice sublimation reactor, and heating the gas-phase carbon dioxide in a gasifier;
s5, feeding the heated gas-phase carbon dioxide into a carbon dioxide buffer tank for buffering;
and S6, feeding the buffered gas-phase carbon dioxide into a compressor for recovering and injecting associated gas of the oil field, and injecting the gas into a gas injection well after four-stage pressure boosting and four-stage temperature reduction.
3. A dry ice sublimation vapor phase pressure injection process according to claim 2, wherein the feeding rate of the precession feeder is 0-10 t/h.
4. A dry ice sublimation vapor phase pressure injection process according to claim 2, wherein the dry ice sublimation reactor is a closed reaction vessel.
5. A dry ice sublimation vapor phase pressure injection process according to claim 2 or 4, wherein an electric heating coil and a partition plate are installed inside the dry ice sublimation reactor.
6. A dry ice sublimation vapor phase pressure injection process according to claim 2, wherein the gasifier heats vapor phase carbon dioxide to above 35 ℃.
7. A dry ice sublimation vapor phase pressure injection process as claimed in claim 2, wherein the carbon dioxide buffer tank ensures that the pressure of the carbon dioxide gas entering the vapor phase compressor is 0.1-0.3 MPa and the temperature is above 35 ℃.
8. A dry ice sublimation vapor phase pressure injection process according to claim 2, wherein the vapor phase carbon dioxide pressure after four-stage pressure increasing and four-stage temperature decreasing is increased to 25MPa at most.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110564039.6A CN113236201A (en) | 2021-05-24 | 2021-05-24 | Dry ice sublimation vapor-phase pressure injection process |
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| CN202110564039.6A CN113236201A (en) | 2021-05-24 | 2021-05-24 | Dry ice sublimation vapor-phase pressure injection process |
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| CN113236201A true CN113236201A (en) | 2021-08-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114619125A (en) * | 2022-05-17 | 2022-06-14 | 徐州玉伟机械设备有限公司 | Welding equipment for machining mechanical parts based on coating without coating |
| CN115596993A (en) * | 2022-12-12 | 2023-01-13 | 中海油能源发展股份有限公司采油服务分公司（Cn） | Liquefied CO 2 Offshore oilfield pressure injection device and method |
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2021
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Application publication date: 20210810 |