CN113914829A - Method for developing hydrate by using deep geothermal energy of ocean drilling well - Google Patents
Method for developing hydrate by using deep geothermal energy of ocean drilling well Download PDFInfo
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- CN113914829A CN113914829A CN202111233453.5A CN202111233453A CN113914829A CN 113914829 A CN113914829 A CN 113914829A CN 202111233453 A CN202111233453 A CN 202111233453A CN 113914829 A CN113914829 A CN 113914829A
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- 229910052742 iron Inorganic materials 0.000 claims description 39
- 238000009434 installation Methods 0.000 claims description 9
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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
- E21B43/01—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
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for anchoring the tools or the like
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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
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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
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
Abstract
The invention discloses a method for developing a hydrate by utilizing the deep geothermal energy of an ocean drilling well, which comprises the following steps: respectively acquiring a target area of an ocean drilling well and a target area of a hydrate drilling and production well; if the ocean drilling well is superposed with the target area of the hydrate drilling and production well, a drilling and production platform is established on the sea level above the target area; sequentially obtaining an ocean drilling well and a hydrate drilling well through a drilling and production platform, and communicating the hydrate drilling well with the ocean drilling well; placing flexible heat pipes in the ocean drilling well and the hydrate drilling and production well; the flexible heat pipe comprises a heat absorption end, a condensation end and a heat insulation section, wherein the heat insulation section is used for connecting the heat absorption end and the condensation end, the heat absorption end is positioned in the ocean drilling well, and the condensation end is positioned in the hydrate drilling well; and performing hydrate mining work in the hydrate drilling and mining well. The deep ground heat of the ocean drilling well is transferred into the hydrate drilling and production well through the flexible heat pipe, so that the hydrate production efficiency is improved while scientific drilling is completed.
Description
Technical Field
The invention relates to the technical field of a method for exploiting a hydrate by utilizing the deep geothermal energy of an ocean drilling well, in particular to a method for exploiting a hydrate by utilizing the deep geothermal energy of the ocean drilling well.
Background
The south China sea is used as the sea area with the largest offshore area and the deepest water in China, and has rich oil gas and biological resources and scientific research value which is difficult to estimate. In recent years, the success of two sea natural gas hydrate pilot productions in China greatly inspires the morale of scientific researchers. At present, the exploitation method of sea natural gas hydrate is mainly based on a depressurization method, the yield is obtained by breaking the phase equilibrium condition of a hydrate reservoir, however, the exploitation is only carried out by the depressurization method, and the commercial yield requirement is difficult to meet. However, the heat source is externally injected, so that the heat loss is large, the energy is difficult to continue, manpower and material resources are consumed, and the expected effect is often not achieved.
The deep sea drilling plan as a telescope deep into the earth is also a field which is continuously concerned and explored by scientists, and the drilling plan is mainly conducted in the south sea area for many times in China. The deep sea drilling has the characteristics that the temperature at the bottom of a drill hole is higher and higher along with the reduction of the drilling depth, and in a drilling area and a hydrate enrichment area, if a heat source at the deep part of a stratum can be directly utilized to a hydrate storage layer section, the hydrate decomposition efficiency can be effectively improved, the yield can be improved, and the industrialization process of natural gas hydrate exploitation in the sea area of China can be assisted.
Disclosure of Invention
The invention mainly aims to provide a method for exploiting hydrate by utilizing the deep geothermal energy of an ocean drilling well, and aims to solve the problem of low hydrate exploitation efficiency.
In order to achieve the above object, the present invention provides a method for exploiting hydrate by using geothermal energy deep in an ocean drilling well, comprising the following steps:
respectively acquiring a target area of an ocean drilling well and a target area of a hydrate drilling and production well;
if the target area of the ocean drilling well is superposed with the target area of the hydrate drilling and production well, a drilling and production platform is established on the sea level above the target area;
sequentially obtaining an ocean drilling well and a hydrate drilling well through a drilling and production platform, and communicating the hydrate drilling well with the ocean drilling well;
placing flexible heat pipes in the ocean drilling well and the hydrate drilling and production well; the flexible heat pipe comprises a heat absorption end, a condensation end and a heat insulation section, the heat insulation section is used for connecting the heat absorption end and the condensation end, the heat absorption end is positioned in the ocean drilling well, and the condensation end is positioned in the hydrate drilling well;
and performing hydrate mining work in the hydrate drilling and mining well.
Preferably, the sequentially obtaining the ocean drilling well and the hydrate drilling and production well through the drilling and production platform comprises the following steps:
establishing the ocean drilling well according to the target area of the ocean drilling well and the procedures of drilling, coring and tripping;
and performing sidetrack windowing at a corresponding position in the ocean drilling well according to the target area of the hydrate drilling and production well, and performing a well completion procedure to establish the hydrate drilling and production well.
Preferably, placing flexible heat pipes in the ocean drilling well and the hydrate drilling and production well comprises the following steps:
measuring the depth H of the heat absorption end head of the flexible heat pipe required to reach the inside of the ocean drilling well1Hydrate drilling and production well levelLength L of segment1A depth H in the ocean drilling well at the position communicated with the hydrate drilling and production well2；
Determining the length of the heat absorption end on the flexible heat pipe to be H1-H2The length of the condensing end on the flexible heat pipe is L1X, where x is one third to two thirds of the length of the adiabatic section 44;
sleeving a threading packer on the flexible heat pipe, wherein the threading packer is fixed at one side of the heat absorption end close to the heat insulation section;
installing a first fixing device at the end of the heat absorption end of the flexible heat pipe, placing the heat absorption end of the flexible heat pipe into the ocean drilling well through the drilling platform, and when the depth of the flexible heat pipe in the ocean drilling well reaches H1Then stopping putting the flexible heat pipe and fixing a first fixing device in the ocean drilling well;
the string-passing packer is set, and the setting mode of the string-passing packer adopts hydraulic setting or mechanical setting;
installing a second fixing device at the end of the condensation end of the flexible heat pipe, fixing the second fixing device by using an underground tractor, driving the second fixing device to move to the interior of the hydrate drilling and production well by using the underground tractor, and fixing the second fixing device in the interior of the hydrate drilling and production well;
the downhole tractor is separated from the second fixture and the downhole tractor is withdrawn back.
Preferably, the depth H required by the heat absorption end head of the flexible heat pipe to reach the inside of the ocean drilling well is measured1The method comprises the following steps:
fixing a temperature probe at the tail end of the measuring rope, wherein the temperature probe is connected with a temperature display through a signal, and automatically alarming when the set temperature of the temperature display reaches 100 ℃;
one end of the measuring rope fixedly connected with the temperature probe is slowly placed into the ocean drilling well, after the temperature display gives an alarm, the placing of the measuring rope is stopped, and the reading H of the measuring rope is read3；
The heat absorbing end head of the flexible heat pipe needs to reach the depth H in the ocean drilling well1＝H3+100 meters.
Preferably, the first fixing device and the second fixing device each comprise a chassis, a mounting ring for fixing the end of the flexible heat pipe, a plurality of fixing assemblies and a driving assembly;
the base plate is disc-shaped, and the mounting ring is fixedly connected to the center of the end face of the base plate; the plurality of fixing assemblies are respectively fixed on the end face of the chassis and are uniformly distributed at the edge of the end face of the chassis;
the fixing assembly comprises an installation block and a fixing iron block, the installation block is fixedly connected to the chassis, a through hole is formed in the installation block, the through hole is horizontally arranged, an extension line of the through hole is intersected with a central axis of the chassis, and the fixing iron block is connected in the through hole in a sliding mode;
the driving assembly is in transmission connection with all the fixed iron blocks respectively and is used for driving all the fixed iron blocks to move in the through holes corresponding to the fixed iron blocks; when fixed iron plate is toward keeping away from when chassis axis direction removes to the ultimate distance, on the first fixing device fixed iron plate end department arrives the distance of chassis axis is greater than the radius of oceanic drilling well, on the second fixing device fixed iron plate end department arrives the distance of chassis axis is greater than the radius of hydrate drilling and production well.
Preferably, the drive assembly comprises a spring, an annular electromagnet and a control assembly;
a driving groove is formed in the mounting block and communicated with the through hole; a driving block is fixedly connected to the fixed iron block and extends into the driving groove; the spring is placed in the driving groove, one end of the spring is connected with the bottom surface, close to the center of the chassis, of the driving groove, and the other end of the spring is connected with the driving block; the spring has elastic force so as to enable the driving block to move away from the center of the chassis;
the annular electromagnet is arranged on the end face of the base, the annular electromagnet and the fixed iron block are positioned on the same horizontal plane, and the magnetic force of the annular electromagnet is greater than the elastic force of the spring;
the control assembly comprises a handheld end and a control circuit, a cavity is arranged in the base, the control circuit is arranged in the cavity, and the control circuit is electrically connected with the annular electromagnet; the handheld end is in signal connection with the control circuit.
Preferably, a heat insulation layer is arranged on the inner wall of the cavity.
Preferably, the second fixing device further comprises a connecting rod, the connecting rod is fixedly connected to the chassis, and the connecting rod is connected with the downhole tractor.
According to the technical scheme, the deep ground heat of the ocean drilling well is transferred into the hydrate drilling and production well through the flexible heat pipe, so that the hydrate production efficiency is improved while scientific drilling is completed.
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 is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a method of the present invention for developing hydrates using geothermal energy deep in an ocean drilled well.
Fig. 2 is a schematic structural diagram of a device used in the method for thermally developing hydrates in deep parts of ocean drilling wells according to the present invention.
Fig. 3 is a schematic structural diagram of a flexible heat pipe in the method for exploiting the hydrate by using the geothermal energy deep in the ocean drilling well according to the invention.
Fig. 4 is a schematic structural diagram of a first fixing device in the method for exploiting the hydrate by using the geothermal energy deep in the ocean drilling well.
Fig. 5 is a cross-sectional view E-E of fig. 4.
Fig. 6 is an enlarged view of a portion a in fig. 4.
Fig. 7 is a schematic structural diagram of a second fixing device in the method for exploiting the hydrate by using the geothermal energy deep in the ocean drilling well.
Fig. 8 is a sectional view F-F in fig. 7.
The reference numbers illustrate: 1-drilling and production platform, 2-ocean drilling well, 3-hydrate drilling and production well, 4-flexible heat pipe, 42-heat absorption end, 43-condensation end, 44-heat insulation section, 41-liquid medium, 5-line-passing packer, 6-first fixing device, 7-second fixing device, 8-chassis, 9-mounting ring, 10-mounting block, 11-fixing iron block, 12-spring, 13-annular electromagnet, 14-driving groove, 15-driving block, 16-control circuit, 17-cavity, 18-heat insulation layer and 19-connecting rod.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1-3, a method for exploiting hydrate by using geothermal energy deep in an ocean drilling well includes the following steps:
respectively acquiring a target area of an ocean drilling well 2 and a target area of a hydrate drilling and production well 3;
if the target area of the ocean drilling well 2 is superposed with the target area of the hydrate drilling and production well 3, a drilling and production platform 1 is established on the sea level above the target area of the ocean drilling well 2;
sequentially obtaining an ocean drilling well 2 and a hydrate drilling well 3 through a drilling and production platform 1, and enabling the hydrate drilling well 3 to be communicated with the ocean drilling well 2;
placing flexible heat pipes 4 in the ocean drilling well 2 and the hydrate drilling and production well 3; the flexible heat pipe 4 comprises a heat absorption end 42, a condensation end 43 and a heat insulation section 44, wherein the heat insulation section 44 is used for connecting the heat absorption end 42 with the condensation end 43, the heat absorption end 42 is positioned in the ocean drilling well 2, and the condensation end 43 is positioned in the hydrate drilling well 3;
and carrying out hydrate mining work in the hydrate drilling and mining well 3.
In the embodiment, the deep geothermal heat of the ocean drilling well 2 is transferred into the hydrate drilling and production well 3 through the flexible heat pipe 4, so that the hydrate production efficiency is improved while scientific drilling is completed. The heat pipe technology is a heat transfer element called a heat pipe invented by George Grofoverd of Luos Alamos national laboratory in 1963, which makes full use of the heat conduction principle and the rapid heat transfer property of a phase change medium, and the heat of a heating object is rapidly transferred out of a heat source through the heat pipe, and the heat conduction capability of the heat pipe exceeds the heat conduction capability of any known metal. The flexible heat pipe 4 adopted in this embodiment includes a heat absorption end 42, a condensation end 43, and a heat insulation section 44, and a liquid medium 41 is provided in a pipe wall of the flexible heat pipe 4 for transferring heat; the heat insulation section 44 is a flexible metal corrugated pipe and can be bent in any direction; the heat absorption end 42 absorbs heat in the ocean drilling well 2, the temperature of the deep part of the ocean drilling well 2 reaches 100-120 ℃, the heat absorbed by the heat absorption end 42 is transmitted to the condensation end 43 through the liquid medium 41, the condensation end 43 is condensed to release heat, the hydrate drilling and production well 3 is heated, the hydrate decomposition is promoted, and the hydrate production efficiency is improved. Compared with the traditional methods such as in-situ thermal excitation, a solar energy-seawater heat supply method, a hot water injection method, electric pulse heating and the like, the heating method utilizes deep geothermal heat of the ocean drilling well 2, adopts an internal injection heat source, and has the advantages of small heat loss, capability of continuously providing heat, manpower and material resources conservation and the like.
Further, the sequentially obtaining the ocean drilling well 2 and the hydrate drilling and production well 3 through the drilling and production platform 1 comprises the following steps:
establishing the ocean drilling well 2 according to the target area of the ocean drilling well 2 according to the procedures of drilling, coring and tripping;
and performing sidetrack windowing on corresponding positions in the ocean drilling well 2 according to the target area of the hydrate drilling and production well 3, and performing a well completion process to establish the hydrate drilling and production well 3.
In this embodiment, the position of the sidetrack window of the ocean drilling well 2 is the middle part of the hydrate reservoir, so that the hydrate drilling and production well 3 is positioned in the middle part of the hydrate reservoir, and the hydrate can be conveniently produced in the hydrate drilling and production well 3.
The steps of placing the flexible heat pipe 4 in the ocean drilling well 2 and the hydrate drilling and production well 3 comprise the following steps:
measuring the depth H required by the end of the heat absorption end 42 of the flexible heat pipe 4 to reach the ocean drilling well 21Length L of horizontal section of hydrate drilling and production well 31The depth H of the position communicated with the hydrate drilling and production well 3 in the ocean drilling well 22；
The length of the heat absorption end 42 on the flexible heat pipe 4 is determined as H1-H2The length of the condensing end 43 on the flexible heat pipe 4 is L1-x, wherein x is one third to two thirds of the length of the heat insulation section 44;
sleeving a thread passing packer 5 on the flexible heat pipe 4, wherein the thread passing packer 5 is fixed on one side, close to the heat insulation section 44, of the heat absorption end 42;
installing a first fixing device 6 at the end of the heat absorption end 42 of the flexible heat pipe 4, placing the heat absorption end 42 of the flexible heat pipe 4 downwards into the ocean drilling well 2 through the drilling platform 1, stopping placing the flexible heat pipe 4 when the depth of the flexible heat pipe 4 placed into the ocean drilling well 2 reaches H1, and fixing the first fixing device 6 in the ocean drilling well 2;
the string-passing packer 5 is set, and the setting mode of the string-passing packer 5 adopts hydraulic setting or mechanical setting;
installing a second fixing device 7 at the end of the condensation end 43 of the flexible heat pipe 4, fixing the second fixing device 7 by using a downhole tractor, driving the second fixing device 7 to move into the hydrate drilling and production well 3 by using the downhole tractor, and fixing the second fixing device 7 in the hydrate drilling and production well 3;
the downhole tractor is separated from the second fixing means 7 and the downhole tractor is withdrawn back.
In the embodiment, the flexible heat pipe 4 is fixed in the ocean drilling well 2 and the hydrate drilling well 3 through a first fixing device 6, a second fixing device 7 and a threading packer 5; the first fixing device 6 and the second fixing device 7 are fixed at two ends of the flexible heat pipe 4, and the wire passing packer 5 is fixed in the middle of the flexible heat pipe 4, so that the stability of the flexible heat pipe 4 is good, and the flexible heat pipe 4 is prevented from deviating. And the string-passing packer 5 also functions to seal off the borehole of the ocean drilled well 2.
In another embodiment, the depth H required for the end of the heat absorption end 42 of the flexible heat pipe 4 to reach the ocean drilling well 2 is measured1The method comprises the following steps:
fixing a temperature probe at the tail end of the measuring rope, wherein the temperature probe is connected with a temperature display through a signal, and automatically alarming when the set temperature of the temperature display reaches 100 ℃;
one end of the measuring rope fixedly connected with the temperature probe is slowly placed into the ocean drilling well 2, after the temperature display gives an alarm, the measuring rope is stopped to be placed, and the reading H of the measuring rope is read3；
The end of the heat absorption end 42 of the flexible heat pipe 4 needs to reach the depth H in the ocean drilling well 21＝H3+100 meters.
In the embodiment, through the above steps, the heat absorption end 42 of the flexible heat pipe 4 is 100 meters at 100 ℃ or more, so that the heat in the ocean drilling well 2 can be sufficiently absorbed; the 100 ℃ is the temperature when the depth of the ocean drilling well is about 3000-4000m, and if the depth of the ocean drilling well 2 is increased, the temperature is correspondingly increased according to the geothermal gradient. If the depth of the ocean drilled well 2 reaches 6000m or more, the temperature of the heat absorbing end 42 of the flexible heat pipe 4 can reach higher temperature, no matter how deep the heat absorbing end 42 of the flexible heat pipe 4 extends into the ocean drilled well 2, the invention is within the protection scope.
Referring to fig. 4-8, each of the first fixing device 6 and the second fixing device 7 includes a chassis 8, a mounting ring 9 for fixing an end of the flexible heat pipe 4, a plurality of fixing components, and a driving component;
the base plate 8 is disc-shaped, and the mounting ring 9 is fixedly connected to the center of the end face of the base plate 8; the plurality of fixing assemblies are respectively fixed on the end face of the chassis 8 and are uniformly distributed at the edge of the end face of the chassis 8;
the fixing assembly comprises an installation block 10 and a fixing iron block 11, the installation block 10 is fixedly connected to the chassis 8, a through hole is formed in the installation block 10, the through hole is horizontally arranged, an extension line of the through hole is intersected with a central axis of the chassis 8, and the fixing iron block 11 is connected in the through hole in a sliding mode;
the driving assembly is in transmission connection with all the fixed iron blocks 11 respectively, so as to be used for driving all the fixed iron blocks 11 to move in the through holes corresponding to the fixed iron blocks; when fixed iron plate 11 toward keeping away from 8 axis directions on the chassis move to the limit distance, on the first fixing device 6 fixed iron plate 11 end department arrives 8 axis's on the chassis distance is greater than the radius of ocean drilling well 2, on the second fixing device 7 fixed iron plate 11 end department arrives 8 axis's on the chassis distance is greater than the radius of hydrate drilling and production well 3.
In the present embodiment, the working principle of the first fixing device 6 and the second fixing device 7 is as follows: all the fixed iron blocks 11 are driven to move by a driving component; the end heads of all the fixed iron blocks 11 on the first fixing device 6 are abutted against the inner wall of the ocean drilling well 2, and the chassis 8 is fixedly connected in the ocean drilling well 2; in the same way, the end heads of all the fixed iron blocks 11 on the second fixing device 7 are abutted against the inner wall of the hydrate drilling and producing well 3, and the chassis 8 is fixedly connected in the hydrate drilling and producing well 3. The mounting ring 9 on the first fixing device 6 is used for fixing the end of the heat absorption end 42 of the flexible heat pipe 4, and the end of the heat absorption end 42 of the flexible heat pipe 4 is tied on the mounting ring 9 on the first fixing device 6, or other fixing manners are used; the mounting ring 9 on the second fixing device 7 is used to fix the end of the condensation end 43 of the flexible heat pipe 4, tie the end of the condensation end 43 of the flexible heat pipe 4 to the mounting ring 9 on the second fixing device 7, or use other fixing methods.
Preferably, the drive assembly comprises a spring 12, an annular electromagnet 13 and a control assembly;
a driving groove 14 is formed in the mounting block 10, and the driving groove 14 is communicated with the through hole; a driving block 15 is fixedly connected to the fixed iron block 11, and the driving block 15 extends into the driving groove 14; the spring 12 is placed in the driving groove 14, one end of the spring 12 is connected with the bottom surface of the driving groove 14 close to the center of the chassis 8, and the other end of the spring 12 is connected with the driving block 15; the spring 12 has an elastic force to move the driving block 15 away from the center of the chassis 8;
the annular electromagnet 13 is arranged on the end face of the base, the annular electromagnet 13 and the fixed iron block 11 are positioned on the same horizontal plane, and the magnetic force of the annular electromagnet 13 is greater than the elastic force of the spring 12;
the control assembly comprises a handheld end and a control circuit 16, a cavity 17 is arranged in the base, the control circuit 16 is arranged in the cavity 17, and the control circuit 16 is electrically connected with the annular electromagnet 13; the hand-held terminal is in signal connection with the control circuit 16.
In this embodiment, the operation principle of the driving assembly is as follows: before the flexible heat pipe 4 is placed, a worker sends a command to the control circuit 16 through the handheld end, the control circuit 16 enables the annular electromagnet 13 to be electrified, and after the annular electromagnet 13 is electrified, the fixed iron block 11 moves towards the direction close to the center of the chassis 8 under the action of the magnetic force of the annular electromagnet 13; the distance from the end of the fixed iron block 11 on the first fixing device 6 to the central axis of the chassis 8 is smaller than the radius of the ocean drilling well 2; and the distance from the end of the fixed iron block 11 on the second fixing device 7 to the central axis of the chassis 8 is smaller than the radius of the hydrate drilling and production well 3. So that the two ends of the flexible heat pipe 4 can be put into the positions corresponding to the ocean drilling and hydrate drilling and production wells 3.
After first fixing device 6 reached corresponding position, on the staff sent the control circuit 16 on the first fixing device 6 through handheld end, control circuit 16 made annular electromagnet 13 cut off the power supply, annular electromagnet 13 cut off the power supply after, drive block 15 on the fixed iron plate 11 received the effect of spring 12 elastic force to remove toward 8 axis directions in principle chassis, make a plurality of fixed iron plates 11 simultaneously lean on with the inner wall of oceanic drilling well 2, with chassis 8 fixed connection on the first fixing device 6 in oceanic drilling well 2.
After the second fixing device 7 reaches the corresponding position, the worker sends a command to the control circuit 16 on the first fixing device 6 through the handheld end, the principle that the chassis 8 on the first fixing device 6 is fixedly connected into the ocean drilling well 2 is consistent, and the chassis 8 on the second fixing device 7 is fixedly connected into the hydrate drilling and production well 3.
Preferably, an insulating layer 18 is arranged on the inner wall of the cavity 17.
In the present embodiment, the thermal insulation layer 18 is provided to effectively protect the control circuit 16 in the cavity 17 and prevent the control circuit 16 from being affected by high temperature or low temperature and being disabled.
Preferably, the second fixing device 7 further comprises a connecting rod 19, the connecting rod 19 is fixedly connected to the chassis 8, and the connecting rod 19 is connected to the downhole tractor.
In this embodiment, the connecting rod 19 is used to connect with a downhole tractor, which will not affect the downhole tractor to transport two fixing devices to their corresponding positions and then return them to the drilling platform 1.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for exploiting the deep geothermal exploitation of hydrates from an ocean drilling well, comprising the steps of:
respectively acquiring a target area of an ocean drilling well and a target area of a hydrate drilling and production well;
if the target area of the ocean drilling well is superposed with the target area of the hydrate drilling and production well, a drilling and production platform is established on the sea level above the target area;
sequentially obtaining an ocean drilling well and a hydrate drilling well through a drilling and production platform, and communicating the hydrate drilling well with the ocean drilling well;
placing flexible heat pipes in the ocean drilling well and the hydrate drilling and production well; the flexible heat pipe comprises a heat absorption end, a condensation end and a heat insulation section, the heat insulation section is used for connecting the heat absorption end and the condensation end, the heat absorption end is positioned in the ocean drilling well, and the condensation end is positioned in the hydrate drilling well;
and performing hydrate mining work in the hydrate drilling and mining well.
2. The method for exploiting the geothermal energy in the deep part of the ocean drilling well for the hydrates as claimed in claim 1, wherein the sequentially obtaining of the ocean drilling well and the hydrate drilling well by the drilling and production platform comprises the following steps:
establishing the ocean drilling well according to the target area of the ocean drilling well and the procedures of drilling, coring and tripping;
and performing sidetrack windowing at a corresponding position in the ocean drilling well according to the target area of the hydrate drilling and production well, and performing a well completion procedure to establish the hydrate drilling and production well.
3. A method of deep geothermal exploitation of hydrates using an ocean drilling well according to claim 1, wherein placing flexible heat pipes in the ocean drilling well and the hydrate drilling well comprises the steps of:
measuring the depth H of the heat absorption end head of the flexible heat pipe required to reach the inside of the ocean drilling well1Length L of horizontal section of hydrate drilling and production well1A depth H in the ocean drilling well at the position communicated with the hydrate drilling and production well2；
Determining the length of the heat absorption end on the flexible heat pipe to be H1-H2The length of the condensing end on the flexible heat pipe is L1-x, wherein x is one third to two thirds of the length of the insulation section;
sleeving a threading packer on the flexible heat pipe, wherein the threading packer is fixed at one side of the heat absorption end close to the heat insulation section;
in a flexible heat pipeThe end of the heat absorption end is provided with a first fixing device, the heat absorption end of the flexible heat pipe is placed into the ocean drilling well through the drilling and production platform, and when the depth of the flexible heat pipe placed into the ocean drilling well reaches H1Then stopping putting the flexible heat pipe and fixing a first fixing device in the ocean drilling well;
the string-passing packer is set, and the setting mode of the string-passing packer adopts hydraulic setting or mechanical setting;
installing a second fixing device at the end of the condensation end of the flexible heat pipe, fixing the second fixing device by using an underground tractor, driving the second fixing device to move to the interior of the hydrate drilling and production well by using the underground tractor, and fixing the second fixing device in the interior of the hydrate drilling and production well;
the downhole tractor is separated from the second fixture and the downhole tractor is withdrawn back.
4. The method for deep geothermal hydrate formation using an ocean boring as defined in claim 3 wherein the depth H required to reach the ocean boring is measured at the heat absorbing end of the flexible heat pipe1The method comprises the following steps:
fixing a temperature probe at the tail end of the measuring rope, wherein the temperature probe is connected with a temperature display through a signal, and automatically alarming when the set temperature of the temperature display reaches 100 ℃;
one end of the measuring rope fixedly connected with the temperature probe is slowly placed into the ocean drilling well, after the temperature display gives an alarm, the placing of the measuring rope is stopped, and the reading H of the measuring rope is read3；
The heat absorbing end head of the flexible heat pipe needs to reach the depth H in the ocean drilling well1＝H3+100 meters.
5. The method for exploiting hydrates by utilizing geothermal heat deep in an ocean drilling well according to claim 4, characterized in that the first fixing device and the second fixing device each comprise a chassis, a mounting ring for fixing the end of the flexible heat pipe, a plurality of fixing assemblies and a driving assembly;
the base plate is disc-shaped, and the mounting ring is fixedly connected to the center of the end face of the base plate; the plurality of fixing assemblies are respectively fixed on the end face of the chassis and are uniformly distributed at the edge of the end face of the chassis;
the fixing assembly comprises an installation block and a fixing iron block, the installation block is fixedly connected to the chassis, a through hole is formed in the installation block, the through hole is horizontally arranged, an extension line of the through hole is intersected with a central axis of the chassis, and the fixing iron block is connected in the through hole in a sliding mode;
the driving assembly is in transmission connection with all the fixed iron blocks respectively and is used for driving all the fixed iron blocks to move in the through holes corresponding to the fixed iron blocks; when fixed iron plate is toward keeping away from when chassis axis direction removes to the ultimate distance, on the first fixing device fixed iron plate end department arrives the distance of chassis axis is greater than the radius of oceanic drilling well, on the second fixing device fixed iron plate end department arrives the distance of chassis axis is greater than the radius of hydrate drilling and production well.
6. The method for deep geothermal hydrate formation using an ocean drilling well according to claim 5 wherein the drive assembly comprises a spring, an annular electromagnet and a control assembly;
a driving groove is formed in the mounting block and communicated with the through hole; a driving block is fixedly connected to the fixed iron block and extends into the driving groove; the spring is placed in the driving groove, one end of the spring is connected with the bottom surface, close to the center of the chassis, of the driving groove, and the other end of the spring is connected with the driving block; the spring has elastic force so as to enable the driving block to move away from the center of the chassis;
the annular electromagnet is arranged on the end face of the base, the annular electromagnet and the fixed iron block are positioned on the same horizontal plane, and the magnetic force of the annular electromagnet is greater than the elastic force of the spring;
the control assembly comprises a handheld end and a control circuit, a cavity is arranged in the base, the control circuit is arranged in the cavity, and the control circuit is electrically connected with the annular electromagnet; the handheld end is in signal connection with the control circuit.
7. The method for exploiting hydrate by using geothermal energy deep in an ocean drilling well according to claim 6, wherein the inner wall of the cavity is provided with a heat insulation layer.
8. The method for exploiting hydrates using geothermal energy deep from an ocean drilling well according to claim 6, characterized in that the second fixing means further comprises a connecting rod fixedly connected to the chassis, the connecting rod being connected to the downhole tractor.
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