CN111749666A - Exploitation system and method for natural gas hydrate horizontal butt well in frozen soil area - Google Patents
Exploitation system and method for natural gas hydrate horizontal butt well in frozen soil area Download PDFInfo
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- CN111749666A CN111749666A CN202010516609.XA CN202010516609A CN111749666A CN 111749666 A CN111749666 A CN 111749666A CN 202010516609 A CN202010516609 A CN 202010516609A CN 111749666 A CN111749666 A CN 111749666A
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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 48
- 239000002689 soil Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 232
- 238000010438 heat treatment Methods 0.000 claims abstract description 128
- 239000003345 natural gas Substances 0.000 claims abstract description 118
- 239000007789 gas Substances 0.000 claims abstract description 64
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 238000003303 reheating Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 17
- 238000004321 preservation Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- -1 natural gas hydrates Chemical class 0.000 claims 4
- 238000005065 mining Methods 0.000 abstract description 9
- 238000001035 drying Methods 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/028—Electrical or electro-magnetic connections
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- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The embodiment of the invention discloses a system and a method for exploiting a natural gas hydrate horizontal butt well in a frozen soil area, which comprises the following steps: putting a vertical pipeline in a vertical well section in the middle of the horizontal butt-joint well, and inserting heating pipelines in directional well sections on two sides of the vertical pipeline; pressurizing the heated natural gas as a circulating medium and introducing the pressurized natural gas into the heating pipeline; the hot natural gas is introduced into a hot gas residence area of the heating pipeline, and stays in the hydrate exploitation layer for heat exchange; pumping the cooled natural gas from the hot gas residence area to a heat increasing box body for reheating, and pressing the heated hot natural gas downwards again to the hot gas residence area for circulating cooling; the scheme separates the pipeline for collecting the natural gas from the pipeline for circularly heating the natural gas, and compared with the prior art, the working pressure of the heater can be reduced, and the heating time is shorter; the drying condition can be constantly kept by circularly heating the natural gas, the damage to the whole mining equipment is low, and long-time mining work can be realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of natural gas hydrate exploitation, in particular to a system and a method for exploiting a natural gas hydrate horizontal butt well in a frozen soil area.
Background
According to the exploitation scheme measures of the natural gas hydrate and the actual experience of the current oil gas exploitation, an economic, feasible and environment-friendly exploitation scheme which takes electric energy as power, natural gas decomposed in holes as a circulating medium, mainly reduces pressure, and mainly heats, is integrated with field unmanned, automatic and manual control, and is monitored by remote alarm is provided.
According to the natural gas hydrate accumulation characteristics and geological characteristics in the woodland area, a submersible pump drainage mode is adopted for depressurization exploitation, so that a water layer is kept below a natural gas hydrate layer, the hydrate layer is not stressed by underground water pressure any more, 1, the high-pressure environment is broken, and natural gas is decomposed; 2. after pressure reduction exploitation is completed, decomposed natural gas is used as a circulating medium to be subjected to electromagnetic heating or solar heating, the heated natural gas is conveyed to the bottom of a hole through a booster pump, and a hydrate layer in the hole is heated to accelerate decomposition of a hydrate.
The mode that current horizontal heating pipeline heated the processing to natural gas hydrate layer is that the natural gas that comes out with perpendicular collection pipeline is as the circulation medium, then carries out pressure boost, heating through compressor and heater, and the compressed natural gas after will heating carries two horizontal heating pipelines through the pipeline respectively again, through the UNICOM passageway between the three pipeline, gives the stratum with heat transfer, promotes natural gas hydrate's decomposition, and continuous taking out from perpendicular collection pipeline, form a circulation circuit, the defect that this kind of mode exists is as follows:
(1) the heated high-temperature natural gas and the low-temperature natural gas generated by decomposition are simultaneously pumped out from the vertical collecting pipeline, and the temperature of the natural gas is greatly reduced due to the mixing of the natural gas with two temperatures, so that the working pressure of the heater is high, the heating time is long, and the energy is wasted;
(2) the low-temperature natural gas is subjected to water condensation after pressurization to influence the service life of the compressor, and water vapor in the heating natural gas is introduced into the horizontal heating pipeline, so that the water vapor is possibly condensed under the action of low temperature, and the normal use of the horizontal heating pipeline is also influenced, so that the loss is caused to the whole mining equipment.
Disclosure of Invention
Therefore, the embodiment of the invention provides a system and a method for exploiting a natural gas hydrate horizontal butt well in a frozen soil area, which aim to solve the problems that in the prior art, the heating time of a circulating medium is long, energy is wasted, water vapor in the circulating medium is possibly condensed under the action of low temperature, and the normal use of a horizontal heating pipeline is influenced, so that the loss of the whole exploitation equipment is caused.
In order to achieve the above object, an embodiment of the present invention provides the following:
a exploitation method of a natural gas hydrate horizontal butt well in a frozen soil area comprises the following steps:
step 100, putting a vertical pipeline in a vertical well section in the middle of a horizontal butt-joint well, and inserting heating pipelines in directional well sections on two sides of the vertical pipeline;
step 200, pressurizing and introducing heated natural gas into the heating pipeline as a circulating medium;
step 300, introducing the hot natural gas to a hot gas residence area of a heating pipeline, and allowing the hot natural gas to stay in the hydrate exploitation layer for heat exchange;
and step 400, pumping the cooled natural gas from the hot gas residence area to a heat increasing box body for reheating, and pressing the heated hot natural gas down to the hot gas residence area again for circulating cooling.
As a preferable scheme of the present invention, in step 100, an inner concave magnetic surface is disposed at the end of the heating pipeline, a spherical connecting section is disposed at the intersection of the lower end of the vertical pipeline and the directional well section, an outer convex magnetic surface is disposed on the outer surface of the spherical connecting section, the magnetism of the inner concave magnetic surface is opposite to that of the outer convex magnetic surface, and the tracking connection is realized by the mutual attraction between the inner concave magnetic surface and the outer convex magnetic surface when the heating pipeline is inserted and lowered.
As a preferable scheme of the present invention, in step 200, the circulation cavity of the heat increasing box is divided into a heat preservation cavity and a heat increasing cavity, the heat preservation cavity and the heat increasing cavity are respectively connected to an air compressor and an air extractor, the natural gas capacity of the heat preservation cavity is the same as the hot natural gas demand of the heating pipeline, and the gas source of the heat increasing cavity is the cooling natural gas for heat exchange in the hot gas residence area.
As a preferable scheme of the present invention, in step 300, the specific steps of passing the hot natural gas downwards to the hot gas residence zone to heat the natural gas hydrate producing formation include:
step 301, pressurizing and guiding hot natural gas in the heat preservation cavity into a hot gas residence area of the heating pipeline, and monitoring pressure and temperature data of the hot gas residence area in real time;
step 302, closing a valve of the hot gas staying area, and communicating heat exchange between hot natural gas and a natural gas hydrate production layer to realize heating of the natural gas hydrate production layer;
and step 303, opening a valve of the hot gas residence area according to the difference between the internal temperature and the external temperature of the hot gas residence area.
In a preferred embodiment of the present invention, the diameter of the heating pipeline decreases from top to bottom, and the heating pipeline secondarily pressurizes the hot natural gas to reduce energy reduction generated in the gas transportation process.
In a preferred embodiment of the present invention, two temperature detection systems are respectively disposed on the inner pipeline and the outer pipeline of the hot gas residence zone, and the cycle operation of the hot natural gas is determined by comparing detection data of the two temperature detection systems.
In a preferred embodiment of the present invention, in step 400, when the hot natural gas is recycled, the hot natural gas is pressed down to the hot gas residence zone in batches at periodic intervals, and the temperature raising effect on the natural gas hydrate layer is improved by increasing the fluidity of the hot natural gas in the hot gas residence zone.
In addition, the invention also provides a system for exploiting the natural gas hydrate horizontal butt well in the frozen soil area, which comprises the following components:
the horizontal butt-joint well comprises a horizontal heating pipeline for heating the natural gas hydrate layer and a vertical collecting pipeline for collecting decomposed natural gas;
the heating device is arranged on the ground above the horizontal heating pipeline and is used for heating the heating circulating medium;
the air compressor is arranged between the heat increasing device and the horizontal heating pipeline and used for pressing the heated natural gas into the pipeline and heating the natural gas hydrate layer;
the air pump is arranged between the heat increasing device and the horizontal heating pipeline and sucks the natural gas cooled in the pipeline up into the heat increasing device for secondary heating;
and the temperature detection system is used for monitoring the internal and external temperatures of the horizontal heating pipeline and calculating the internal and external temperature difference.
As a preferable scheme of the invention, the heating temperature of the heating device to natural gas is 100-200 ℃, and the connecting positions of the air compressor and the air pump and the horizontal heating pipeline are respectively provided with a first electromagnetic valve and a second electromagnetic valve.
As a preferable scheme of the present invention, a hot gas staying area is disposed at a tail end of the horizontal heating pipeline, a third electromagnetic valve is disposed in the hot gas staying area of the horizontal heating pipeline, the third electromagnetic valve is in control connection with the temperature detection system, the temperature detection system is installed on the inner side and the outer side of the pipeline of the hot gas staying area, when an inner temperature difference and an outer temperature difference are smaller than a set value, the third electromagnetic valve is opened, the air extractor sucks up cooled natural gas to the heat increasing device, and the air compressor presses down backup hot natural gas in the heat increasing device to the hot gas staying area.
The embodiment of the invention has the following advantages:
(1) the pipeline for collecting the natural gas and the pipeline for circularly heating the natural gas are separated, so that the temperature reduction and temperature rise of the circularly heated natural gas are constant, the working pressure of the heater can be reduced compared with the prior art, and the heating time is short;
(2) the circulation heating natural gas can constantly keep the drying condition, has low damage to the whole mining equipment and can realize long-time mining work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic diagram of a horizontal docking well according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a horizontal butt well production method according to an embodiment of the present invention.
In the figure: 1-concave magnetic surface; 2-a spherical connecting section; 3-convex magnetic surface; 4-heat preservation cavity; 5-heating the cavity; 6-air compressor; 7-an air extractor; 8-horizontal butt well; 9-a heat increasing device; 10-a temperature detection system; 11-hot gas residence zone; 12-electromagnetic valve.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
As shown in fig. 1 and 2, the horizontal butt-joint well of the present invention is divided into a horizontal heating pipeline and a vertical collecting pipeline, the vertical collecting pipeline firstly breaks the reservoir balance of the natural gas hydrate by using a pumping and depressurizing device, the horizontal heating pipeline is mainly used for introducing heated natural gas to heat the natural gas hydrate layer, so as to promote the decomposition of the natural gas hydrate, and the decomposed natural gas hydrate is continuously pumped out from the vertical collecting pipeline, so that the natural gas hydrate is mined.
In the prior art, heated high-temperature natural gas and low-temperature natural gas generated by decomposition are simultaneously pumped out from a vertical collecting pipeline, and the temperature of the natural gas is greatly reduced due to the mixing of the natural gas with two temperatures, so that the working pressure of a heater is high, the heating time is long, and the energy is wasted;
and the low-temperature natural gas leads to moisture condensation after being pressurized, the service life of the compressor is influenced, the steam in the heating natural gas is introduced into the horizontal heating pipeline, the condensation of the steam is possibly caused by the low-temperature effect, and the normal use of the horizontal heating pipeline is also influenced, so that the loss is caused to the whole exploitation equipment.
In order to solve the above problems, in the present embodiment, the pipeline for collecting natural gas and the pipeline for circularly heating natural gas are separated, so that the temperature reduction and temperature rise of the circularly heated natural gas are constant, the working pressure of the heater can be reduced compared to the prior art, and the heating time is short. In addition, the circulation heating of the natural gas in the embodiment can keep the drying condition all the time, the damage to the whole mining equipment is low, and the long-time mining work can be realized.
The method specifically comprises the following steps:
step 100, a vertical pipeline is lowered in the vertical well section in the middle of the horizontal butt-joint well, and heating pipelines are inserted in the directional well sections on two sides of the vertical pipeline.
In step 100, an inner concave magnetic surface 1 is arranged at the tail end of the heating pipeline, a spherical connecting section 2 is arranged at the intersection of the lower end of the vertical pipeline and the directional well section, an outer convex magnetic surface 3 is arranged on the outer surface of the spherical connecting section 2, the magnetism of the inner concave magnetic surface 1 is opposite to that of the outer convex magnetic surface 3, and tracking connection is achieved through mutual attraction of the inner concave magnetic surface 1 and the outer convex magnetic surface 3 when the heating pipeline is inserted and placed down.
When the whole exploitation system is installed, the vertical pipeline is firstly placed down along the vertical well section, then the heating pipeline is inserted along the directional well section, and in order to determine the stability of the whole horizontal butt-joint well, the tracking connection between the vertical pipeline and the directional well section is realized through the mutual attraction of the concave magnetic surface 1 and the convex magnetic surface 3.
And 200, pressurizing the heated natural gas serving as a circulating medium and introducing the pressurized natural gas into the heating pipeline.
The circulating medium natural gas is heated in the heating box body, and the circulating cavity of the heating box body is divided into the heat preservation cavity 4 and the heating cavity 5, that is to say, the natural gas is heated in the heating cavity 5 and then transferred into the heat preservation cavity 4 for heat preservation and storage, and the hot natural gas in the heat preservation cavity 4 is introduced into the heating pipeline to promote the decomposition of the natural gas hydrate.
The heat preservation cavity 4 and the temperature-increasing cavity 5 are respectively connected with an air compressor 6 and an air extractor 7, the natural gas containing capacity of the heat preservation cavity 4 is equal to the heat natural gas demand of the heating pipeline, and the gas source of the temperature-increasing cavity 5 is cooling natural gas for heat exchange in a hot gas residence area of the heating pipeline.
And 300, introducing the hot natural gas to a hot gas residence area of the heating pipeline, and allowing the hot natural gas to stay in the hydrate exploitation layer for heat exchange.
The specific steps of introducing hot natural gas to the hot gas residence zone to heat the natural gas hydrate producing layer are as follows:
step 301, pressurizing and guiding hot natural gas in the heat preservation cavity into a hot gas residence area of the heating pipeline, and monitoring pressure and temperature data of the hot gas residence area in real time;
step 302, closing a valve of the hot gas staying area, and communicating heat exchange between hot natural gas and a natural gas hydrate production layer to realize heating of the natural gas hydrate production layer;
and step 303, opening a valve of the hot gas residence area according to the difference between the internal temperature and the external temperature of the hot gas residence area.
That is to say, in the embodiment, the hot gas staying area is divided in the heating pipeline, and the valve is additionally arranged on the hot gas staying area, so that the heat exchange time of the natural gas is prolonged, the heat exchange between the hot natural gas and the natural gas hydrate is realized, and the heating decomposition efficiency of the natural gas hydrate is improved.
In addition, the diameters of the heating pipelines are sequentially reduced from top to bottom, so that the heating pipelines can pressurize the hot natural gas for the second time, and the energy reduction generated in the gas transmission process is reduced.
And step 400, pumping the cooled natural gas from the hot gas residence area to a heat increasing box body for reheating, and pressing the heated hot natural gas down to the hot gas residence area again for circulating cooling.
And the inner pipeline and the outer pipeline of the hot gas staying area are respectively provided with two temperature detection systems, and the circulating operation of the hot natural gas is determined by comparing the detection data of the two temperature detection systems.
When the hot natural gas is recycled, the hot natural gas is pressed down to the hot gas residence zone in batches according to the periodic interval, and the temperature rise effect of the natural gas hydrate layer is improved by increasing the mobility of the hot natural gas in the hot gas residence zone.
In summary, in the embodiment, the communication mode of the vertical pipeline and the three wells of the two heating pipelines is changed into the mode that the vertical pipeline and the three wells of the two heating pipelines are independent, and the circulating medium natural gas of the heating pipelines is separated from the decomposed and collected natural gas, so that the working energy consumption for heating the circulating medium natural gas can be reduced, and the heating time is short. In addition, the circulation heating of the natural gas in the embodiment can keep the drying condition all the time, the damage to the whole mining equipment is low, and the long-time mining work can be realized.
In addition, the invention also provides a system for exploiting the natural gas hydrate horizontal butt well in the frozen soil area, which comprises the following components:
and the horizontal butt joint well 8 comprises a horizontal heating pipeline for heating the natural gas hydrate layer and a vertical collecting pipeline for collecting decomposed natural gas.
The heating device 9 is arranged on the ground above the horizontal heating pipeline and used for heating the heating circulating medium, the heating temperature of the heating device 9 for the natural gas is 100-200 ℃, and explosion caused by overhigh temperature of the natural gas is avoided.
The air compressor with the air extractor with horizontal heating pipeline's hookup location is equipped with first solenoid valve and second solenoid valve respectively, when the natural gas that will cool down shifts to heat increasing device 9 from heating pipeline's steam dwell area when heating, then closes first solenoid valve, and the second solenoid valve is opened, when the natural gas after will heating pushes down to horizontal heating pipeline when heaing up the natural gas hydrate, then opens first solenoid valve, and the second solenoid valve is closed.
And the air compressor 6 is arranged between the heat increasing device and the horizontal heating pipeline and used for pressing the heated natural gas into the pipeline and heating the natural gas hydrate layer.
And the air pump 7 is arranged between the heat increasing device and the horizontal heating pipeline and sucks the natural gas cooled in the pipeline up to the heat increasing device for secondary heating.
And the temperature detection system 10 is used for monitoring the internal and external temperatures of the horizontal heating pipeline and calculating the internal and external temperature difference.
Horizontal heating pipeline's end is equipped with hot gas dwell area 11, and horizontal heating pipeline is in be equipped with third solenoid valve 12 in the hot gas dwell area 11, third solenoid valve 12 with temperature detection system 10 establishes the control connection, temperature detection system 10 installs the inside and outside both sides of hot gas dwell area 11 pipeline, when inside and outside temperature difference is less than the setting value, third solenoid valve 12 is opened, air extractor 7 will inhale the refrigerated natural gas with the heat gain device 9, will behind the air compressor 6 back-up hot natural gas in the heat gain device 9 pushes down hot gas dwell area 11.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A exploitation method of a natural gas hydrate horizontal butt well in a frozen soil area is characterized by comprising the following steps:
step 100, putting a vertical pipeline in a vertical well section in the middle of a horizontal butt-joint well, and inserting heating pipelines in directional well sections on two sides of the vertical pipeline;
step 200, pressurizing and introducing heated natural gas into the heating pipeline as a circulating medium;
step 300, introducing the hot natural gas to a hot gas residence area of a heating pipeline, and allowing the hot natural gas to stay in the hydrate exploitation layer for heat exchange;
and step 400, pumping the cooled natural gas from the hot gas residence area to a heat increasing box body for reheating, and pressing the heated hot natural gas down to the hot gas residence area again for circulating cooling.
2. The frozen soil region natural gas hydrate horizontal butt well exploitation method according to claim 1, wherein in step 100, the end of the heating pipeline is provided with an inner concave magnetic surface (1), the lower end of the vertical pipeline is provided with a spherical connecting section (2) at the intersection with the directional well section, the outer surface of the spherical connecting section (2) is provided with an outer convex magnetic surface (3), the magnetism of the inner concave magnetic surface (1) is opposite to that of the outer convex magnetic surface (3), and the heating pipeline is inserted and lowered to realize tracking connection through the mutual attraction of the inner concave magnetic surface (1) and the outer convex magnetic surface (3).
3. The method for exploiting the natural gas hydrate horizontal butt well in the frozen soil area according to claim 2, wherein in step 200, the circulation cavity of the heat increasing box is divided into a heat insulating cavity (4) and a heat increasing cavity (5), the heat insulating cavity (4) and the heat increasing cavity (5) are respectively connected with an air compressor (6) and an air extractor (7), the natural gas capacity of the heat insulating cavity (4) is the same as the heat natural gas demand of the heating pipeline, and the gas source of the heat increasing cavity (5) is cooling natural gas for heat exchange in the hot gas staying area.
4. The method for exploiting the natural gas hydrate horizontal butt well in the frozen soil area according to the claim 3, wherein in the step 300, the step of passing the hot natural gas to the hot gas residence area to heat the natural gas hydrate exploitation layer comprises the following specific steps:
step 301, pressurizing and guiding hot natural gas in the heat preservation cavity into a hot gas residence area of the heating pipeline, and monitoring pressure and temperature data of the hot gas residence area in real time;
step 302, closing a valve of the hot gas staying area, and communicating heat exchange between hot natural gas and a natural gas hydrate production layer to realize heating of the natural gas hydrate production layer;
and step 303, opening a valve of the hot gas residence area according to the difference between the internal temperature and the external temperature of the hot gas residence area.
5. A horizontal butt well exploitation method for natural gas hydrates in a frozen soil region according to claim 4, wherein the diameter of the heating pipeline is reduced from top to bottom, and the heating pipeline secondarily pressurizes the hot natural gas to reduce energy reduction generated in the gas transmission process.
6. The method for exploiting the natural gas hydrate horizontal butt well in the frozen soil area according to claim 5, wherein two temperature detection systems are respectively arranged on an inner pipeline and an outer pipeline of the hot gas residence area, and the circulating operation of the hot natural gas is determined by comparing detection data of the two temperature detection systems.
7. The method for exploiting natural gas hydrates at the frozen soil region by the horizontal butt well according to claim 5, wherein in the step 400, when the hot natural gas is recycled, the hot natural gas is pressed down to the hot gas residence region in batches according to periodic intervals, and the effect of temperature increase on the natural gas hydrate layer is improved by increasing the mobility of the hot natural gas in the hot gas residence region.
8. A exploitation system of a horizontal butt well of natural gas hydrates in a frozen soil area is applied to the exploitation method of the horizontal butt well of the natural gas hydrates in the frozen soil area according to any one of claims 1 to 7, and is characterized by comprising the following steps:
the horizontal butt well (8) comprises a horizontal heating pipeline for heating the natural gas hydrate layer and a vertical collecting pipeline for collecting decomposed natural gas;
the heating device (9) is arranged on the ground above the horizontal heating pipeline and is used for heating the heating circulating medium;
the air compressor (6) is arranged between the heat increasing device and the horizontal heating pipeline and used for pressing the heated natural gas into the pipeline and heating the natural gas hydrate layer;
the air pump (7) is arranged between the heat increasing device and the horizontal heating pipeline and is used for sucking the natural gas cooled in the pipeline up to the heat increasing device for secondary heating;
and the temperature detection system (10) is used for monitoring the internal and external temperatures of the horizontal heating pipeline and calculating the internal and external temperature difference.
9. The permafrost region natural gas hydrate horizontal butt well exploitation system according to claim 8, wherein: the heating temperature of the heating device (9) for natural gas is 100-200 ℃, and the connecting positions of the air compressor (6) and the air pump (7) and the horizontal heating pipeline are respectively provided with a first electromagnetic valve and a second electromagnetic valve.
10. The permafrost region natural gas hydrate horizontal butt well exploitation system according to claim 8, wherein: horizontal heating pipeline's end is equipped with hot gas dwell area (11), and horizontal heating pipeline is in be equipped with third solenoid valve (12) in hot gas dwell area (11), third solenoid valve (12) with temperature detecting system (10) establish control contact, temperature detecting system (10) are installed the inside and outside both sides of hot gas dwell area (11) pipeline, when inside and outside temperature difference is less than the setting value, third solenoid valve (12) are opened, air extractor (7) are with inhaling on the refrigerated natural gas extremely heat gain device (9), will behind air compressor (6) backup heat natural gas in heat gain device (9) pushes down hot gas dwell area (11).
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