CN108756747A - Enhanced geothermal system construction method based on magnetic steering and device - Google Patents
Enhanced geothermal system construction method based on magnetic steering and device Download PDFInfo
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- CN108756747A CN108756747A CN201810447265.4A CN201810447265A CN108756747A CN 108756747 A CN108756747 A CN 108756747A CN 201810447265 A CN201810447265 A CN 201810447265A CN 108756747 A CN108756747 A CN 108756747A
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 93
- 238000010276 construction Methods 0.000 title claims abstract description 30
- 238000005338 heat storage Methods 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 230000005389 magnetism Effects 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 210000002445 nipple Anatomy 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 16
- 239000011435 rock Substances 0.000 abstract description 11
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- 238000010586 diagram Methods 0.000 description 8
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- 238000012545 processing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 230000005358 geomagnetic field Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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Classifications
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides a kind of enhanced geothermal system construction method and device based on magnetic steering, including：After being drilled injection well and forming artificial heat storage crack, controls to artificial heat storage crack and inject magnetic support agent；Obtain the earth magnetism field signal influenced by magnetic support agent；The wellbore trace of producing well is determined according to the earth magnetism field signal；The drill-well operation of producing well is completed according to the wellbore trace control of the producing well.The program stores up crack location using magnetic steering positioning hot dry rock heat, can effectively solve the problems, such as in enhanced geothermal system building process crack and producing well can not accurate commutation, high degree reduces the risk and cost that misses the target of producing well.
Description
Technical field
The present invention relates to Development of Geothermal Resources technical field, more particularly to a kind of enhanced geothermal system based on magnetic steering
Construction method and device.
Background technology
Currently, the natural environment and climate problem that China's energy consumption structure based on fossil energy, is brought therewith is increasingly serious.
Geothermal energy has many advantages, such as that low-carbon environment-friendly, stability are good, Ke Xunhuanliyong as a kind of important renewable and clean energy resource, with
The energy such as wind energy, solar energy are compared, and not by season, weather, extraneous factors are interfered round the clock etc., are a kind of reproducible new energy of cleaning
Source meets the Major Strategic Demand of China's energy development.The geothermal energy resources rich reserves in China, developing and utilizingpotentiality are huge.It pushes away
The Efficient Development of dynamic China's dry-hot-rock geothermal resource, for promoting energy-saving and emission-reduction, improving environment and tool of uplifting the people's living standard
It is significant.
Current enhanced geothermal system (Enhanced Geothermal System, EGS) is the deep geothermal heats such as hot dry rock
Main development scheme.The structure of enhanced geothermal system and passes through waterpower firstly the need of a bite injection well is bored to purpose reservoir
The modes such as pressure break manufacture of intraocular Fracture Systems in purpose reservoir, i.e., artificial heat storage.Bore later flatly or several mouthfuls of producing wells with
Heat storage is connected, and hot loop system is taken to form a closure by injection well, heat storage, production well construction.Pass through injection well
Injection takes thermal medium (water and carbon dioxide etc.), is produced from producing well through the storage heating of rock stratum heat, then by ground installations such as turbines
Carry out gas-to electricity.
In enhanced geothermal system building process, precisely effectively connection producing well and heat storage are that the circulatory system is built into
The key lost.However, currently also immature for the technology for information acquisition in high-temperature stratum heat storage crack, man-made fracture target area orientation
It is big with range prediction difficulty, and precision is not high, causes the accurate commutation operation difficulty in producing well and heat storage crack huge, producing well
Drilling well miss the target risk height, dramatically increase enhanced geothermal system construction cost, limit deep layer dry-hot-rock geothermal money
The Efficient Development in source.
Invention content
An embodiment of the present invention provides a kind of enhanced geothermal system construction method and device based on magnetic steering, utilizes magnetic
Guide-localization hot dry rock heat stores up crack location, can effectively solve in enhanced geothermal system building process that crack and producing well can not
The problem of accurate commutation, high degree reduce the risk and cost that misses the target of producing well.
The enhanced geothermal system construction method based on magnetic steering includes：
After being drilled injection well and forming artificial heat storage crack, controls to artificial heat storage crack and inject magnetic support agent；
Obtain the earth magnetism field signal influenced by magnetic support agent；
The wellbore trace of producing well is determined according to the earth magnetism field signal；
The drill-well operation of producing well is completed according to the wellbore trace control of the producing well.
In one embodiment, the magnetic support agent is made of ndfeb magnetic material.
In one embodiment, the earth magnetism field signal influenced by magnetic support agent is obtained in the following way：
During boring producing well connection manually heat storage crack, the magnetic field detection of the subsidiary installation on drill bit used is utilized
Equipment obtains the earth magnetism field signal influenced by magnetic support agent.
In one embodiment, the magnetic field detection device is fluxgate sensor.
In one embodiment, the fluxgate sensor be mounted on the pipe nipple of subsidiary installation on drill bit, inclinometer or
In orientation device MWD.
In one embodiment, the wellbore trace of producing well is determined according to the earth magnetism field signal, including：
Determine that producing well and artificial heat store up the up-front relative bearing in crack and distance according to the earth magnetism field signal；
According to the relative bearing and apart from the wellbore trace for determining producing well.
In one embodiment, it is controlling to after the pump note magnetic support agent of artificial heat storage crack, is further including：
It controls to artificial heat storage crack and injects non magnetic proppant, most by magnetic support agent top to artificial heat storage crack
Leading edge.
The enhanced geothermal system construction device based on magnetic steering includes：
Control module, for after being drilled injection well and forming artificial heat storage crack, controlling and being injected to artificial heat storage crack
Magnetic support agent；
Signal acquisition module, for obtaining the earth magnetism field signal influenced by magnetic support agent；
Wellbore trace determining module, the wellbore trace for determining producing well according to the earth magnetism field signal；
The control module is additionally operable to：The drill-well operation of producing well is completed according to the wellbore trace control of the producing well.
In one embodiment, the wellbore trace determining module is specifically used for：
Determine that producing well and artificial heat store up the up-front relative bearing in crack and distance according to the earth magnetism field signal；
According to the relative bearing and apart from the wellbore trace for determining producing well.
In one embodiment, the control module is additionally operable to：
It controls to artificial heat storage crack and injects non magnetic proppant, most by magnetic support agent top to artificial heat storage crack
Leading edge.
In embodiments of the present invention, magnetic support agent is injected to artificial heat storage crack, utilizes magnetic steering positioning hot dry rock heat
Crack location is stored up, the wellbore trace of producing well is determined, can effectively solve crack and production in enhanced geothermal system building process
Well can not accurate commutation the problem of, high degree reduces the risk and cost that misses the target of producing well.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of enhanced geothermal system construction method flow chart based on magnetic steering provided in an embodiment of the present invention；
Fig. 2 is that a kind of enhanced geothermal system construction method based on magnetic steering provided in an embodiment of the present invention is specifically applied
Work schematic diagram；
Fig. 3 is a kind of enhanced geothermal system construction device structural frames based on magnetic steering provided in an embodiment of the present invention
Figure；
Drawing reference numeral therein：
1- high temperature hot dry rock reservoirs；2- injection wells；3- artificial heat storages crack；4- ferromagnetism proppants；5- high temperature resistants are without magnetic
Proppant；6- producing wells；7- drill bits；8- power drilling tools；9- is equipped with the pipe nipple of fluxgate sensor；10- earth magnetism field signals；11-
Transmission cable.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
In embodiments of the present invention, a kind of enhanced geothermal system construction method based on magnetic steering is provided, such as Fig. 1 institutes
Show, this method includes：
Step 101：After being drilled injection well and forming artificial heat storage crack, control to the magnetic branch of artificial heat storage crack injection
Support agent；
Step 102：Obtain the earth magnetism field signal influenced by magnetic support agent；
Step 103：The wellbore trace of producing well is determined according to the earth magnetism field signal；
Step 104：The drill-well operation of producing well is completed according to the wellbore trace control of the producing well.
When it is implemented, realizing all processes of the enhanced geothermal system structure based on magnetic steering in conjunction with Fig. 1 and 2.
(1) it selectes and determines target hot dry rock reservoir 1, a bite injection well is bored using conventional hot dry rock boring method and equipment
2 to target zone, in destination layer in a manner of bore hole completion；
(2) extensive hydraulic fracturing is carried out in destination layer position 1, forms vertical extensional artificial heat storage crack 3, fracturing process
The information such as the middle orientation for monitoring artificial heat storage crack in real time using micro-seismic method and trend；
The first two steps are identical as existing enhanced geothermal system EGS establishments process.
(3) (i.e. step 101) carries magnetic support agent 4, to the artificial heat according to crack scale by fracturing fluid high speed
It stores up and pumps one section of magnetic support agent 4 of note in crack 3, which has ferromagnetism.It can use heat safe neodymium iron
Boron ferromagnetic material is made according to certain ingredients ratio, has bad working environments that are ferromagnetic while can bearing underground high temperature and pressure.
Injecting the effect of ferromagnetism proppant 4 is：One side supporting crack ensures fracture condudtiviy, on the other hand magnetic field is used as to believe
Number source, exerts one's influence to geomagnetic field.Magnetic support agent injecting program is consistent with oil-gas field fracturing rear support agent injecting program；
(4) after pressure break, the seismic cloud information obtained with micro-seismic method is distributed according to seismic cloud information and determines crack location
And orientation, selected substantially target position and the drilling for starting producing well 6；
The step is identical as existing enhanced geothermal system EGS establishments process.
(5) after Conventional drilling equipment is drilled into 1 top of target hot dry rock reservoir, high-temperature resistant drill bit 7 and steering tool are used instead
The equipment such as (i.e. power drilling tool) 8 carry out temperature reservoirs drilling well, while with tripping in magnetic field detection device is bored, for detecting and passing ground back
Magnetic field signal.The magnetic field detection device can be fluxgate sensor, the fluxgate sensor be mounted on subsidiary on drill bit plus
In the pipe nipple 9 of dress, heat safe inclinometer or orientation device MWD.
Wherein, fluxgate sensor be using high conducting magnet core in tested magnetic field under the saturation activation of alternating magnetic field,
The non-linear relation of magnetic induction intensity and magnetic field intensity measures a kind of sensor of low-intensity magnetic field.With other types magnetic measurement apparatus phase
Than fluxgate sensor has high resolving power, measurement low-intensity magnetic field range component that is wide, reliable, can directly measuring magnetic field and fits
In used in fast kinematic system the features such as.
Inclinometer is a kind of top for measuring the engineering structures such as drilling, foundation pit, foundation, wall and dam body slope
Angle, azimuthal instrument.
MWD orientation devices, mean " measurement while drilling initially means main measurement while drilling well track parameter, including：
Hole angle, azimuth, tool face azimuth and auxiliary parameter such as temperature etc..
(6) (i.e. step 102-104) fluxgate sensor 9 visits detection earth magnetism field signal 10, the earth magnetism field signal in real time
10 are back in the control device of ground control centre by transmission cable 11 and are calculated and analyzed, and producing well and artificial is obtained
The up-front relative bearing in heat storage crack and distance, according to the relative bearing and apart from the wellbore trace for determining producing well.Control
Device adjusts the parameters such as drilling direction, orientation and hole angle in real time by controlling steering tool according to the wellbore trace of producing well,
Well track is accurately controlled until middle target；
(7) after completion, the power generating equipments such as wellhead equipment and turbine are installed, complete to be closed the structure for taking hot systems.
When it is implemented, effectively taking hot area for increase geothermal system, heat storage crack is made full use of, generally requires to make life
Well Target localization is produced in edge of crack, producing well and injection well spacing is made to maximize.This engineering optimization standard, further increases
The structure difficulty of the circulatory system, while also to the precision of positioning fracture orientation and distance method, more stringent requirements are proposed.But
This effect cannot be reached by being the construction method of existing enhanced geothermal system EGS.Based on this, the present invention is executing step
(3) after injection magnetic support agent 4, heat safe no magnetic proppant 5 is also and then injected, extremely by the ferromagnetism proppant 4 top
Artificial heat storage edge of crack position.Producing well and injection well spacing can in this way maximized, utmostly heat storage in raising system
Efficiently use length and area.At this point, what is obtained by earth magnetism field signal 10 is orientation of the strong magnetic proppant 4 relative to drill bit 7
And distance.
Based on same inventive concept, a kind of enhanced geothermal system based on magnetic steering is additionally provided in the embodiment of the present invention
Construction device, as described in the following examples.It is solved the problems, such as due to the enhanced geothermal system construction device based on magnetic steering
Principle is similar to the enhanced geothermal system construction method based on magnetic steering, therefore the enhanced geothermal system structure based on magnetic steering
The implementation for building device may refer to the implementation of the enhanced geothermal system construction method based on magnetic steering, and it is no longer superfluous to repeat place
It states.Used below, the combination of the software and/or hardware of predetermined function may be implemented in term " unit " or " module ".To the greatest extent
Device described in pipe following embodiment is preferably realized with software, but the reality of the combination of hardware or software and hardware
Now and may and it be contemplated.
Fig. 3 is a kind of structure diagram of the enhanced geothermal system construction device based on magnetic steering of the embodiment of the present invention,
The enhanced geothermal system construction device, that is, control device based on magnetic steering, as shown in figure 3, the control device includes：
Control module 301, for after being drilled injection well and forming artificial heat storage crack, controlling and being noted to artificial heat storage crack
Enter magnetic support agent；
Signal acquisition module 302, for obtaining the earth magnetism field signal influenced by magnetic support agent；
Wellbore trace determining module 303, the wellbore trace for determining producing well according to the earth magnetism field signal；
The control module 301 is additionally operable to：The drilling well behaviour of producing well is completed according to the wellbore trace control of the producing well
Make.
The structure is illustrated below.
When it is implemented, the wellbore trace determining module 303 is specifically used for：
Determine that producing well and artificial heat store up the up-front relative bearing in crack and distance according to the earth magnetism field signal；
According to the relative bearing and apart from the wellbore trace for determining producing well.
When it is implemented, the control module 301 is additionally operable to：
It controls to artificial heat storage crack and injects non magnetic proppant, most by magnetic support agent top to artificial heat storage crack
Leading edge.
In conclusion the present invention can obtain following advantageous effect：
The present invention can effectively solve producing well in enhanced geothermal system building process can not accurate commutation with heat storage crack
And heat stores up the problems such as effective development degree in crack is low.By injecting strong magnetic and heat safe proppant, on the one hand, heat can be improved
Store up fracture condudtiviy；On the other hand, ferromagnetism proppant is passed using above drill bit with the subsidiary fluxgate of brill as magnetic beacon
Sensor detects influence of the strong magnetic proppant to geomagnetic field, can obtain in real time target target position relative to the orientation of drill bit and away from
From, and then real time correction well track, it is ensured that producing well is accurately docked with heat storage crack, effectively solves enhanced geothermal system structure
During building crack and producing well can not accurate commutation the problem of, high degree reduces the risk and cost that misses the target of producing well.
In addition, strong magnetic proppant, which is replaced to heat, stores up seam end, producing well links up in fracture tip with heat storage, helps to increase producing well
With the well spacing of injection well, heat storage crack is utmostly employed, the thermal efficiency is taken to be conducive to improve enhanced geothermal system.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, the present invention can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made by
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of enhanced geothermal system construction method based on magnetic steering, which is characterized in that including：
After being drilled injection well and forming artificial heat storage crack, controls to artificial heat storage crack and inject magnetic support agent；
Obtain the earth magnetism field signal influenced by magnetic support agent；
The wellbore trace of producing well is determined according to the earth magnetism field signal；
The drill-well operation of producing well is completed according to the wellbore trace control of the producing well.
2. the enhanced geothermal system construction method based on magnetic steering as described in claim 1, which is characterized in that the magnetism
Proppant is made of ndfeb magnetic material.
3. the enhanced geothermal system construction method based on magnetic steering as described in claim 1, which is characterized in that using as follows
Mode obtains the earth magnetism field signal influenced by magnetic support agent：
During boring producing well connection manually heat storage crack, the magnetic field detection device of the subsidiary installation on drill bit used is utilized
Obtain the earth magnetism field signal influenced by magnetic support agent.
4. the enhanced geothermal system construction method based on magnetic steering as claimed in claim 3, which is characterized in that the magnetic field
Detection device is fluxgate sensor.
5. the enhanced geothermal system construction method based on magnetic steering as claimed in claim 4, which is characterized in that the magnetic flux
Door sensor is mounted in the pipe nipple, inclinometer or orientation device MWD of the subsidiary installation on drill bit.
6. the enhanced geothermal system construction method based on magnetic steering as described in claim 1, which is characterized in that according to described
Earth magnetism field signal determines the wellbore trace of producing well, including：
Determine that producing well and artificial heat store up the up-front relative bearing in crack and distance according to the earth magnetism field signal；
According to the relative bearing and apart from the wellbore trace for determining producing well.
7. the enhanced geothermal system construction method based on magnetic steering as described in claim 1, which is characterized in that control to
After the pump note magnetic support agent of artificial heat storage crack, further include：
It controls to artificial heat storage crack and injects non magnetic proppant, before crack is stored up most in magnetic support agent top to artificial heat
Edge.
8. a kind of enhanced geothermal system construction device based on magnetic steering, which is characterized in that including：
Control module, for after being drilled injection well and forming artificial heat storage crack, controlling magnetic to artificial heat storage crack injection
Proppant；
Signal acquisition module, for obtaining the earth magnetism field signal influenced by magnetic support agent；
Wellbore trace determining module, the wellbore trace for determining producing well according to the earth magnetism field signal；
The control module is additionally operable to：The drill-well operation of producing well is completed according to the wellbore trace control of the producing well.
9. the enhanced geothermal system construction device based on magnetic steering as claimed in claim 8, which is characterized in that the drilling well
Track determining module is specifically used for：
Determine that producing well and artificial heat store up the up-front relative bearing in crack and distance according to the earth magnetism field signal；
According to the relative bearing and apart from the wellbore trace for determining producing well.
10. the enhanced geothermal system construction device based on magnetic steering as claimed in claim 8, which is characterized in that the control
Molding block is additionally operable to：
It controls to artificial heat storage crack and injects non magnetic proppant, before crack is stored up most in magnetic support agent top to artificial heat
Edge.
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