CN115306364A - Natural gas hydrate in-situ heating drainage and mining device and drainage and mining method thereof - Google Patents
Natural gas hydrate in-situ heating drainage and mining device and drainage and mining method thereof Download PDFInfo
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- CN115306364A CN115306364A CN202210938360.0A CN202210938360A CN115306364A CN 115306364 A CN115306364 A CN 115306364A CN 202210938360 A CN202210938360 A CN 202210938360A CN 115306364 A CN115306364 A CN 115306364A
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005065 mining Methods 0.000 title claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000002485 combustion reaction Methods 0.000 claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 48
- 239000007921 spray Substances 0.000 claims abstract description 48
- 239000003345 natural gas Substances 0.000 claims abstract description 46
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000008239 natural water Substances 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 61
- 229910052760 oxygen Inorganic materials 0.000 claims description 61
- 239000001301 oxygen Substances 0.000 claims description 61
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 42
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000001569 carbon dioxide Substances 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 4
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- 238000000354 decomposition reaction Methods 0.000 description 16
- 230000003197 catalytic effect Effects 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 6
- -1 natural gas hydrates Chemical class 0.000 description 6
- 239000002671 adjuvant Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
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- 239000003209 petroleum derivative Substances 0.000 description 2
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- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
Abstract
The invention discloses a natural gas hydrate in-situ heating discharging and mining device and a discharging and mining method thereof. The method comprises the steps of conveying a combustion improver into a horizontal section of a production well in an underground natural gas hydrate reservoir through a coaxial continuous oil pipe, igniting combustible gas, pulling a combustion assistant spray pipe to reciprocate in the horizontal section of the production well, and heating a well wall of the horizontal section of the production well to promote natural gas hydrate in the natural gas hydrate reservoir to be rapidly decomposed into natural gas and water. This patent is through heating the wall of a well of exploitation well horizontal segment, promotes hydrate and decomposes fast, and simultaneously, waste gas after the burning has reduced the liquid column pressure of pit shaft, lifts for the interior liquid of pit shaft and provides sufficient power, and this patent method has the characteristics that exploitation simple process, exploitation efficiency height, low cost, easy operation, is applicable to the large-scale industrialization exploitation of ocean natural gas hydrate.
Description
Technical Field
The invention relates to a natural gas hydrate exploitation technology, in particular to a natural gas hydrate in-situ heating drainage and exploitation device and a drainage and exploitation method thereof.
Background
The natural gas hydrate is an envelope-type compound formed by water molecules and guest molecules filled in the water molecules, and exists in a crystal form under a low-temperature and high-pressure environment. The natural gas hydrate in the nature is mainly methane hydrate, and is given to permafrost areas and deep sea sediments under low-temperature and high-pressure environment conditions, methane gas with the standard volume of 150-180 and water with the standard volume of 0.8 can be generated by decomposing methane hydrate with the unit volume of 1 unit volume, and the natural gas hydrate has the advantages of huge reserves, wide distribution, shallow burial depth and high energy density, and the estimated organic carbon stored in the form of natural gas hydrate on the earth accounts for 53 percent of the total organic carbon of the whole world and is 2 times of the total carbon of three fossil fuels of coal, petroleum and natural gas. Therefore, the natural gas hydrate is considered as an ideal clean alternative energy in the 21 st century and has a good application prospect.
Since the natural gas hydrate has the change of solid-liquid-gas three phase states, compared with the conventional petroleum and natural gas, the exploitation difficulty is larger, and from 2002, the trial exploitation and research of the natural gas hydrate developed at the Marlik (Malik) station in the northern region of Canada prove that the natural gas hydrate can be decomposed into gas and liquid for flowing through heating and pressure reduction, so that the research preface of the efficient exploitation of the natural gas hydrate is opened. At present, the internationally generally accepted natural gas hydrate exploitation methods mainly comprise: the exploitation method mainly refers to the conventional oil gas exploitation process, firstly, a shaft is built through a well to directly reach a reservoir stratum of the natural gas hydrate, then, appropriate physical and chemical means are adopted, the thermodynamic conditions such as the temperature or the pressure of the reservoir stratum are changed, the combination environment of the hydrate is damaged, the natural gas hydrate is promoted to be decomposed into water and natural gas, and finally, the decomposed natural gas and the water are collected and conveyed to the ground, so that the exploitation of the natural gas hydrate is realized.
In recent 30 years, scientists of various countries have conducted laboratory experiments of comparative systems and small-scale field exploitation experiments on the development technology of natural gas hydrates, and verified the exploitation technologies and methods of various natural gas hydrates, the main exploitation mechanism is to decompose the natural gas hydrates by reducing the pressure of a natural gas hydrate reservoir to below a thermodynamic equilibrium line, but the decomposition process of the natural gas hydrates needs to absorb a large amount of heat, so that the temperature of the reservoir is reduced, when the temperature is reduced to a certain degree, the phase equilibrium of the natural gas hydrates is adversely affected, so that free water in pores of the reservoir is frozen and the hydrates are secondarily generated, pore channels are blocked, and the permeability of the reservoir is reduced, therefore, the temperature of the reservoir is maintained and increased, and the method has a very important significance on exploitation of the natural gas hydrates.
The national intellectual property office discloses a patent document with publication number CN1920251B, which specifically discloses the following contents: the invention adopts the following technical scheme: 1) And constructing a production well and a gas collecting well. Firstly, constructing an exploitation well and a gas collection well in a hydrate mining area by adopting the prior art in the technical field of deepwater drilling, and constructing a connecting channel between the exploitation well and the gas collection well; the production well and the gas collection well penetrate to the bottom of the hydrate reservoir. 2) And (4) decomposing the natural gas hydrate. Injecting a hydrate decomposition accelerator into a hydrate reservoir to decompose the natural gas hydrate into natural gas and water, simultaneously heating a heat-carrying fluid by adopting an oxidant in-situ catalytic oxidation combustion fuel in a catalytic oxidation burner arranged under a production well, pumping the heat-carrying fluid into the hydrate reservoir to supply heat energy required by the decomposition of the natural gas hydrate, injecting CO2 gas generated by catalytic oxidation combustion into the hydrate reservoir to form CO2 hydrate to fill gaps left after the methane hydrate is exploited, transferring the heat released by the generation of the CO2 hydrate to the hydrate decomposition accelerator for the decomposition of the natural gas hydrate, absorbing the moisture in the decomposition accelerator by the formation of the CO2 hydrate, and improving the concentration of the hydrate decomposition accelerator. 3) And (4) exporting the decomposed natural gas. And collecting the decomposed natural gas to a separation and gas storage device on the sea surface through a natural gas export pipeline.
The natural gas hydrate decomposition in the step (2) can be specifically refined into the following steps: the catalytic oxidation burner is preheated by adopting electric heating ignition; (2) Delivering fuel and oxidant to a catalytic oxidation burner installed in the production well, the fuel and oxidant being preheated in a preheater; (3) Under the action of a catalyst, the fuel is catalytically oxidized by an oxidant in a downhole catalytic oxidation combustor to release heat to heat a heat-carrying fluid; (4) Injecting a hydrate decomposition accelerator into the natural gas hydrate reservoir to decompose the natural gas hydrate into natural gas and water; (5) The heat-carrying fluid is conveyed to a hydrate reservoir stratum to heat a hydrate decomposition promoter and a natural gas hydrate reservoir stratum, so that the decomposition of the natural gas hydrate is promoted; (6) Conveying the catalytic oxidation combustion products to a hydrate reservoir, and controlling the temperature of the hydrate reservoir to be lower than the stable temperature of the CO2 hydrate and higher than the stable temperature of the CH4 hydrate; (7) CO2 in the catalytic oxidation combustion products forms CO2 hydrate in a hydrate reservoir, and the hydrate is released to generate heat to heat the hydrate decomposition accelerator; (8) The CO2 hydrate forms and absorbs water in the hydrate decomposition accelerator, the concentration of the hydrate decomposition accelerator is increased, and the decomposition rate of the natural gas hydrate is accelerated.
According to the technical scheme, the heat-carrying fluid generated by the combustor is introduced into the natural gas hydrate reservoir to heat the natural gas hydrate reservoir, and the heat-carrying fluid is introduced into the natural gas hydrate reservoir due to the fact that the pressure of the natural gas hydrate reservoir is high, so that certain difficulty exists in actual operation, and the actual using effect of the heating mode by adopting the technology is not ideal. In addition, the technical scheme needs to create two wells, namely a gas collecting well and a production well, and the gas collecting cost is high.
Disclosure of Invention
The invention aims to provide a natural gas hydrate in-situ heating drainage and mining device which has the characteristics of strong practicability, high mining efficiency and convenience in operation.
The invention aims to provide a natural gas hydrate in-situ heating drainage and mining method which has the characteristics of high mining efficiency and low cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a natural gas hydrate normal position heating is arranged and is adopted device, includes coaxial coiled tubing, electron ignition ring and combustion adjuvant spray tube, coaxial coiled tubing includes outer tube, inner tube and outer tube joint, and the electron ignition ring is established on the combustion adjuvant spray tube, and the one end intercommunication of combustion adjuvant spray tube and inner tube, the other end of inner tube pass from the outer tube with combustion adjuvant high pressure gas source intercommunication, the tip at the outer tube is installed to the outer tube joint for fix inner tube and outer tube together, and make inner tube and outer tube coaxial center installation, the annular space between outer tube and the inner tube adopts row passageway for the natural gas, be equipped with on the outer tube joint with the communicating natural gas of row passageway adopts the exhaust hole.
Furthermore, the combustion aid is oxygen, the high-pressure gas source of the combustion aid comprises an oxygen generating device and a gas pressurizing device, and oxygen of the oxygen generating device is pressurized by the gas pressurizing device and then is sent into the inner pipe.
Furthermore, one end of the combustion aid spray pipe is provided with a slip connector, the slip connector is connected with the inner pipe through a locking anchor, the other end of the combustion aid spray pipe is of a closed conical structure, and a plurality of combustion aid outlets are distributed on the conical surface of the conical structure; the outer tube is connected with the outer tube joint through the locking anchor.
Furthermore, an oxygen concentration sensor and a temperature and pressure sensor are arranged on the combustion aid spray pipe.
Further, a carbon dioxide concentration sensor is arranged on the combustion aid spray pipe.
Furthermore, two ceramic insulation slip rings are arranged on the combustion aid spray pipe, and the oxygen concentration sensor, the temperature pressure sensor and the carbon dioxide concentration sensor are located between the two ceramic insulation slip rings.
Furthermore, a cable is arranged in the inner tube and is simultaneously electrically connected with the temperature pressure sensor, the carbon dioxide concentration sensor, the oxygen concentration sensor and the electronic ignition ring.
Further, the oxygen concentration sensor is provided with two, and two oxygen concentration sensors are located the next door of electron ignition ring, carbon dioxide concentration sensor is located between two oxygen concentration sensors.
A combustion improver is conveyed into a horizontal section of a production well in an underground natural gas hydrate reservoir through a coaxial continuous oil pipe, the combustion improver and natural gas in the horizontal section of the production well are mixed into combustible gas, the combustible gas is ignited by an electronic ignition device, the coaxial continuous oil pipe is pulled to drive a combustion assistant spray pipe to reciprocate in the horizontal section of the production well to heat a well wall of the horizontal section of the production well, the well wall of the horizontal section of the production well transfers heat to the natural gas hydrate reservoir to promote the natural gas hydrate in the natural gas hydrate reservoir to be rapidly decomposed into natural gas and water, and the natural gas and the water are discharged to a treatment system on a deck of an ocean platform through an annular channel between an inner pipe and an outer pipe of the coaxial continuous oil pipe.
Further, the natural gas hydrate in-situ heating drainage and production method comprises the following specific steps:
s1, constructing a production well: establishing an initial well with a horizontal section in a natural gas hydrate reservoir by using a modern drilling technology, then putting a casing pipe and a sand control pipe column into the initial well, and finally installing a well mouth to complete the well construction project of a production well;
s2, installing an in-situ heating drainage and mining device: the method comprises the following steps that coaxial coiled tubing operation equipment, oxygen production equipment and gas pressurization equipment are arranged on an ocean platform and are connected through high-pressure pipelines;
s3, conveying the combustion aid spray pipe to a production well: after the coaxial coiled tubing is installed and connected with the combustion aid spray pipe, the coaxial coiled tubing is continuously conveyed into a production well by utilizing coaxial coiled tubing operation equipment, and the combustion aid conveying spray pipe is conveyed into a horizontal section of the production well;
s4, conveying oxygen to a production well: starting the oxygen generating equipment, wherein oxygen provided by the oxygen generating equipment is pressurized by the gas pressurizing equipment and then is conveyed to the combustion aid conveying spray pipe through the inner pipe of the coaxial continuous oil pipe, and the oxygen enters the horizontal section of the production well through the combustion aid spray pipe;
s5, extracting liquid in the production well: discharging liquid in the production well to a liquid treatment system on the ocean platform through an annulus between an inner pipe and an outer pipe of the coaxial coiled tubing;
s6, igniting combustible gas: after the liquid in the exploiting well is completely emptied, starting an electronic ignition ring to ignite combustible gas in the horizontal section in the exploiting well;
s7, adjusting the oxygen flow: the flow of the injected oxygen is adjusted through feedback parameters of a temperature pressure sensor and an oxygen concentration sensor on the combustion assistant spray pipe so as to control the combustion intensity;
s8, controlling a combustion area: controlling the speed of the coaxial continuous oil pipe for taking out and putting in to drag the combustion assistant spray pipe to reciprocate in the horizontal section of the production well so as to continuously change the heating position of the horizontal section in the production well, thereby realizing the control of the combustion surface;
s9, discharging and extracting natural gas: and (3) closing the oxygen generation equipment, decomposing the natural gas hydrate in the natural gas hydrate reservoir into natural gas and water after heating, enabling the natural gas and the water to enter the exploitation well, and discharging the natural gas, the water and the combusted tail gas to a treatment system on the deck of the ocean platform through an annular channel between an inner pipe and an outer pipe of the coaxial coiled tubing.
The invention has the beneficial effects that:
the device and the method have the characteristics of simple mining process, high mining efficiency, low cost and simple operation, and are suitable for large-scale industrial mining of the marine natural gas hydrate.
Drawings
The invention is further described with the aid of the accompanying drawings, in which the embodiments do not constitute any limitation, and for a person skilled in the art, without inventive effort, further drawings may be obtained from the following figures:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic illustration of the heating state in the practice of the present invention;
FIG. 4 is a flow chart of the present invention.
In the figure: 1. an outer tube; 2. an inner tube; 3. an outer pipe joint; 4. an electronic ignition ring; 5. a combustion aid nozzle; 6. a natural gas extraction and drainage channel; 7. a natural gas extraction and drainage hole; 8. a slip connector; 9. a combustion aid outlet; 10. an oxygen concentration sensor; 11. a carbon dioxide concentration sensor; 12. a temperature pressure sensor; 13. a cable wire; 14. a production well is produced; 15. an ocean platform; 16. a coaxial coiled tubing; 17. a ceramic insulating slip ring; 18. a horizontal segment.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
As shown in fig. 1 and 2, a natural gas hydrate in-situ heating, discharging and extracting device comprises a coaxial coiled tubing, an electronic ignition ring 4 and a combustion aid spray pipe 5, wherein the coaxial coiled tubing 16 comprises an outer pipe 1, an inner pipe 2 and an outer pipe joint 3, the electronic ignition ring 4 is arranged on the combustion aid spray pipe 5, the combustion aid spray pipe 5 is communicated with one end of the inner pipe 2, the other end of the inner pipe 2 penetrates through the outer pipe 1 to be communicated with a combustion aid high-pressure gas source, the outer pipe joint 3 is arranged at the end part of the outer pipe 1 to fix the inner pipe 2 and the outer pipe 1 together, the inner pipe 2 and the outer pipe 1 are coaxially arranged, an annular space between the outer pipe 1 and the inner pipe 2 is a natural gas extracting and extracting channel 6, and the outer pipe joint 3 is provided with a natural gas extracting and extracting hole 7 communicated with the natural gas extracting and extracting channel 6.
The combustion auxiliary agent is oxygen, the high-pressure gas source of the combustion auxiliary agent comprises an oxygen generating device and a gas supercharging device, and oxygen of the oxygen generating device is pressurized by the gas supercharging device and then is sent into the inner pipe.
One end of the combustion aid spray pipe 5 is provided with a slip connector 8, the slip connector 8 is connected with the inner pipe 2 through a locking anchor, the other end of the combustion aid spray pipe 5 is of a closed conical structure, and a plurality of combustion aid outlets 9 are distributed on the conical surface of the conical structure; the outer tube 1 is connected to the outer tube fitting 3 by means of a locking anchor.
An oxygen concentration sensor 10 is arranged on the combustion assistant spray pipe 5. The combustion assistant spray pipe 5 is provided with a carbon dioxide concentration sensor 11. The combustion aid nozzle 5 is provided with a temperature and pressure sensor 12. The number of the oxygen concentration sensors 10 is two, the two oxygen concentration sensors 10 are located beside the electronic ignition ring 4, and the carbon dioxide concentration sensor 11 is located between the two oxygen concentration sensors 10.
Two ceramic insulating slip rings 17 are arranged on the combustion aid nozzle 5, and the oxygen concentration sensor 10, the temperature pressure sensor 12 and the carbon dioxide concentration sensor 11 are positioned between the two ceramic insulating slip rings 17.
And a cable 13 is arranged in the inner pipe 2, and the cable 13 is simultaneously and electrically connected with the temperature and pressure sensor 12, the carbon dioxide concentration sensor 11, the oxygen concentration sensor 10 and the electronic ignition ring 4.
As shown in figure 3, the combustion improver is conveyed into a horizontal section 18 of a production well 14 in an underground natural gas hydrate reservoir through a coaxial continuous oil pipe, the combustion improver and natural gas in the horizontal section of the production well are mixed into combustible gas, the combustible gas is ignited by an electronic ignition ring 4 (an electronic ignition device), the coaxial continuous oil pipe 16 is pulled to drive a combustion assistant spray pipe 5 to reciprocate in the horizontal section 18 of the production well to heat a well wall of the horizontal section 18 of the production well, the well wall of the horizontal section of the production well transfers heat to the natural gas hydrate reservoir, the natural gas hydrate in the natural gas hydrate reservoir is promoted to be rapidly decomposed into natural gas and water, and the natural gas and the water are discharged to a processing system on a deck of a marine platform through an annular channel between an inner pipe and an outer pipe of the coaxial continuous oil pipe.
As shown in fig. 3 and 4, specifically, the natural gas hydrate in-situ heating, drainage and production method includes the following steps:
s1, constructing a production well 14: establishing an initial well with a horizontal section 18 in a natural gas hydrate reservoir by using a modern drilling technology, then putting a casing pipe and a sand control pipe column into the initial well, and finally installing a well mouth to complete the well construction project of the exploitation well 14;
s2, installing an in-situ heating drainage and mining device: coaxial continuous oil pipe operation equipment, oxygen generation equipment and gas pressurization equipment are arranged on the ocean platform 15 and are connected through high-pressure pipelines;
s3, conveying the combustion aid spray pipe to a production well: after the coaxial coiled tubing 16 is installed and connected with the combustion aid spray pipe 5, the coaxial coiled tubing is wound on a roller of coaxial coiled tubing operation equipment in a bending mode, the coaxial coiled tubing is continuously conveyed into the production well 14 by the coaxial coiled tubing operation equipment, and the combustion aid spray pipe is conveyed into a horizontal section of the production well 14;
s4, conveying oxygen to the production well 14: starting the oxygen generating equipment, wherein oxygen provided by the oxygen generating equipment is pressurized by the gas pressurizing equipment and then is conveyed to the combustion aid conveying spray pipe through the inner pipe of the coaxial continuous oil pipe, and the oxygen enters the horizontal section of the production well through the combustion aid spray pipe;
s5, extracting liquid in the production well: discharging liquid in the production well to a liquid treatment system on the ocean platform through an annulus between an inner pipe and an outer pipe of the coaxial coiled tubing;
s6, igniting combustible gas: after the liquid in the exploitation well is completely emptied, the electronic ignition ring 4 is started to ignite the combustible gas in the horizontal section 18 in the exploitation well;
s7, adjusting the oxygen flow: the flow of the injected oxygen is adjusted through feedback parameters of a temperature pressure sensor 12 and an oxygen concentration sensor 10 on the combustion aid spray pipe so as to control the combustion intensity;
s8, controlling a combustion area: controlling the pulling-out and pulling-in speeds of the coaxial coiled tubing 16 to drag the combustion assistant spray pipe 5 to reciprocate in the horizontal section 18 of the production well so as to continuously change the heating position of the horizontal section in the production well, thereby realizing the control of the combustion surface;
s9, discharging and extracting natural gas: the oxygen generation equipment is closed, after heating, the natural gas hydrate in the natural gas hydrate reservoir is decomposed into natural gas and water, and the natural gas, the water and the burnt tail gas are all discharged to the processing system on the deck of the ocean platform through an annular passage between the inner pipe and the outer pipe of the coaxial coiled tubing 16.
The hydrate is a cage-shaped solid crystal formed by combining gas molecules such as methane and the like and water molecules under a certain temperature and pressure condition, and is deposited in a seabed argillaceous silt storage layer.
The invention has the advantages that the combustion improver is conveyed to the underground, the combustion improver is mixed with combustible gas produced by a stratum, and then the mixture is heated by utilizing the high-voltage ignition system, so that the underground in-situ combustion is completed, the generated heat destroys the thermodynamic condition formed by the hydrate, the rapid decomposition of the hydrate is promoted, meanwhile, the liquid column pressure of a shaft is reduced by the waste gas after the combustion, and sufficient power is provided for the lifting of liquid in the shaft.
Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a natural gas hydrate normal position heating is arranged and is adopted device which characterized in that: including coaxial coiled tubing, electron ignition ring and combustion aid spray tube, coaxial coiled tubing includes outer tube, inner tube and outer tube joint, and the electron ignition ring is established on the combustion aid spray tube, and the one end intercommunication of combustion aid spray tube and inner tube, the other end of inner tube pass from the outer tube with combustion aid high-pressure gas source intercommunication, the tip at the outer tube is installed to the outer tube joint for fix inner tube and outer tube together, and make inner tube and outer tube install with the axle center, the annular space between outer tube and the inner tube is the natural gas and adopts row passageway, be equipped with on the outer tube joint and adopt the communicating natural gas of row passageway with the natural gas and adopt row hole.
2. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 1, wherein: the combustion aid is oxygen, the high-pressure gas source of the combustion aid comprises an oxygen generating device and a gas supercharging device, and the oxygen of the oxygen generating device is pressurized by the gas supercharging device and then is fed into the inner pipe.
3. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 2, wherein: one end of the combustion aid spray pipe is provided with a slip connector, the slip connector is connected with the inner pipe through a locking anchor, the other end of the combustion aid spray pipe is of a closed conical structure, and a plurality of combustion aid outlets are distributed on the conical surface of the conical structure; the outer tube is connected with the outer tube joint through the locking anchor.
4. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 2, wherein: and an oxygen concentration sensor and a temperature and pressure sensor are arranged on the combustion assistant spray pipe.
5. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 4, wherein: and a carbon dioxide concentration sensor is arranged on the combustion auxiliary agent spray pipe.
6. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 5, wherein: and two ceramic insulating slip rings are arranged on the combustion assistant spray pipe, and the oxygen concentration sensor, the temperature pressure sensor and the carbon dioxide concentration sensor are positioned between the two ceramic insulating slip rings.
7. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 6, wherein: and a cable is arranged in the inner tube and is simultaneously electrically connected with the temperature pressure sensor, the carbon dioxide concentration sensor, the oxygen concentration sensor and the electronic ignition ring.
8. The natural gas hydrate in-situ heating, discharging and extracting device as claimed in claim 7, wherein: the oxygen concentration sensor is equipped with two, and two oxygen concentration sensors are located the next door of electron ignition ring, carbon dioxide concentration sensor is located between two oxygen concentration sensors.
9. A natural gas hydrate in-situ heating drainage and production method is characterized by comprising the following steps: the combustion improver is conveyed into a horizontal section of a production well in an underground natural gas hydrate reservoir through a coaxial continuous oil pipe, the combustion improver and natural gas in the horizontal section of the production well are mixed into combustible gas, the combustible gas is ignited by an electronic ignition device, the coaxial continuous oil pipe is pulled to drive a combustion improver spray pipe to move back and forth in the horizontal section of the production well to heat a well wall of the horizontal section of the production well, the well wall of the horizontal section of the production well transfers heat to the natural gas hydrate reservoir, natural gas hydrate in the natural gas hydrate reservoir is promoted to be rapidly decomposed into natural gas and water, and the natural gas and the water are discharged to a processing system on a deck of an ocean platform through an annular passage between an inner pipe and an outer pipe of the coaxial continuous oil pipe.
10. The method for in-situ heating, discharging and extracting natural gas hydrate according to claim 9, comprising the following specific steps:
s1, constructing a production well: establishing an initial well with a horizontal section in a natural gas hydrate reservoir by using a modern drilling technology, then putting a casing pipe and a sand control pipe column into the initial well, and finally installing a well mouth to complete the well construction project of a production well;
s2, installing an in-situ heating drainage and mining device: the method comprises the following steps that coaxial coiled tubing operation equipment, oxygen generation equipment and gas pressurization equipment are arranged on an ocean platform and connected through high-pressure pipelines;
s3, conveying the combustion aid spray pipe to a production well: after the coaxial coiled tubing is installed and connected with the combustion aid spray pipe, the coaxial coiled tubing is conveyed into the production well continuously by utilizing coaxial coiled tubing operation equipment, and the combustion aid conveying spray pipe is conveyed into a horizontal section of the production well;
s4, conveying oxygen to a production well: starting the oxygen generating equipment, wherein oxygen provided by the oxygen generating equipment is pressurized by the gas pressurizing equipment and then is conveyed to the combustion aid conveying spray pipe through the inner pipe of the coaxial continuous oil pipe, and the oxygen enters the horizontal section of the production well through the combustion aid spray pipe;
s5, extracting liquid in the production well: discharging liquid in the production well to a liquid treatment system on the ocean platform through an annulus between an inner pipe and an outer pipe of the coaxial coiled tubing;
s6, igniting combustible gas: after the liquid in the exploiting well is completely emptied, starting an electronic ignition ring to ignite combustible gas in the horizontal section of the exploiting well;
s7, adjusting the oxygen flow: adjusting the flow of injected oxygen through feedback parameters of a temperature pressure sensor and an oxygen concentration sensor on the combustion aid spray pipe to control the combustion intensity;
s8, controlling a combustion area: controlling the pulling-out and pulling-in speeds of the coaxial coiled tubing to drag the combustion assistant spray pipe to reciprocate in the horizontal section of the production well so as to continuously change the heating position of the horizontal section of the production well, thereby realizing the control of the combustion surface;
s9, discharging and extracting natural gas: and (3) closing the oxygen generation equipment, decomposing the natural gas hydrate in the natural gas hydrate reservoir into natural gas and water after heating, enabling the natural gas and the water to enter the exploitation well, and discharging the natural gas, the water and the combusted tail gas to a treatment system on the deck of the ocean platform through an annular channel between an inner pipe and an outer pipe of the coaxial coiled tubing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116517511A (en) * | 2023-07-03 | 2023-08-01 | 辽宁高盛新能源有限公司 | Exploitation device of natural gas hydrate for multi-branch well |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474237A (en) * | 1983-12-07 | 1984-10-02 | Mobil Oil Corporation | Method for initiating an oxygen driven in-situ combustion process |
| US20050016725A1 (en) * | 2003-07-22 | 2005-01-27 | Pfefferle William C. | Method for natural gas production |
| CN1920251A (en) * | 2006-09-07 | 2007-02-28 | 中国科学院广州能源研究所 | Method and device for natural gas hydrate exploitation with in-situ catalytic oxidation thermochemistry method |
| US20080268300A1 (en) * | 2007-04-30 | 2008-10-30 | Pfefferle William C | Method for producing fuel and power from a methane hydrate bed using a fuel cell |
| CN104653158A (en) * | 2015-02-17 | 2015-05-27 | 吉林大学 | In-well heat accumulation type combustion heating device |
| CN105134152A (en) * | 2015-08-24 | 2015-12-09 | 中国石油大学(北京) | Method and system for extracting natural gas hydrate through thermal jet flow |
| CN105545270A (en) * | 2015-12-15 | 2016-05-04 | 大连理工大学 | Natural gas hydrate exploitation method and device adopting in-situ combustion method |
| CN107120097A (en) * | 2017-07-05 | 2017-09-01 | 大连海事大学 | Temperature activation method quarrying apparatus for exploitation of gas hydrates in marine sediment |
| JP6306773B1 (en) * | 2017-04-26 | 2018-04-04 | 国立成功大學 | Burner for methane hydrate |
| CN109356556A (en) * | 2018-11-20 | 2019-02-19 | 中国石油大学(华东) | A kind of recovery method and device of the burning of deep water shallow layer gas hydrate underground |
-
2022
- 2022-08-05 CN CN202210938360.0A patent/CN115306364A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474237A (en) * | 1983-12-07 | 1984-10-02 | Mobil Oil Corporation | Method for initiating an oxygen driven in-situ combustion process |
| US20050016725A1 (en) * | 2003-07-22 | 2005-01-27 | Pfefferle William C. | Method for natural gas production |
| CN1920251A (en) * | 2006-09-07 | 2007-02-28 | 中国科学院广州能源研究所 | Method and device for natural gas hydrate exploitation with in-situ catalytic oxidation thermochemistry method |
| US20080268300A1 (en) * | 2007-04-30 | 2008-10-30 | Pfefferle William C | Method for producing fuel and power from a methane hydrate bed using a fuel cell |
| CN104653158A (en) * | 2015-02-17 | 2015-05-27 | 吉林大学 | In-well heat accumulation type combustion heating device |
| CN105134152A (en) * | 2015-08-24 | 2015-12-09 | 中国石油大学(北京) | Method and system for extracting natural gas hydrate through thermal jet flow |
| CN105545270A (en) * | 2015-12-15 | 2016-05-04 | 大连理工大学 | Natural gas hydrate exploitation method and device adopting in-situ combustion method |
| JP6306773B1 (en) * | 2017-04-26 | 2018-04-04 | 国立成功大學 | Burner for methane hydrate |
| CN107120097A (en) * | 2017-07-05 | 2017-09-01 | 大连海事大学 | Temperature activation method quarrying apparatus for exploitation of gas hydrates in marine sediment |
| CN109356556A (en) * | 2018-11-20 | 2019-02-19 | 中国石油大学(华东) | A kind of recovery method and device of the burning of deep water shallow layer gas hydrate underground |
Non-Patent Citations (1)
| Title |
|---|
| 王汉鹏 等: "地下盐穴储气库造腔控制与注采运行安全评估", 31 January 2021, 山东大学出版社, pages: 29 - 33 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116517511A (en) * | 2023-07-03 | 2023-08-01 | 辽宁高盛新能源有限公司 | Exploitation device of natural gas hydrate for multi-branch well |
| CN116517511B (en) * | 2023-07-03 | 2023-08-29 | 辽宁高盛新能源有限公司 | Exploitation device of natural gas hydrate for multi-branch well |
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