CN106437669B - A kind of thermal cracking seam method and system for deep hot dry rock formation production - Google Patents
A kind of thermal cracking seam method and system for deep hot dry rock formation production Download PDFInfo
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- CN106437669B CN106437669B CN201610945706.4A CN201610945706A CN106437669B CN 106437669 B CN106437669 B CN 106437669B CN 201610945706 A CN201610945706 A CN 201610945706A CN 106437669 B CN106437669 B CN 106437669B
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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
- E21B43/25—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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
- E21B43/247—Combustion in situ in association with fracturing processes or crevice forming processes
- E21B43/248—Combustion in situ in association with fracturing processes or crevice forming processes using explosives
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
Abstract
The present invention provides a kind of thermal cracking seam method and system for deep hot dry rock formation production.This method includes：Target location injection oxidant, fuel and the water on stratum into injection well section, to generate major fracture；Oxidant, fuel and water are injected, until the crack formed reaches scheduled development length or the crack formed and can connect formation between injection well and producing well；Proppant and load fluid are pumped into major fracture after mixing, are pumped into displacement fluid, closing well completes thermal cracking seam.The thermal cracking seam system includes feedway, coiled tubing, guider, anchor, high-pressure hose and combustion reaction device；Coiled tubing top is connected with feedway, and bottom end is connected with the top of guider；The bottom end of guider is connected with anchor, and the side wall of guider is equipped with communication port.Technical solution provided by the invention has many advantages, such as that increasing yield and injection effect is good, safety is higher, cost of winning is low, system structure is relatively simple.
Description
Technical field
The present invention relates to a kind of thermal cracking seam method and system suitable for deep hot dry rock formation production, belong to the energy
Production technique field.
Background technology
Geothermal energy is a kind of clean energy resource of rich reserves, it can be used for generating electricity, warms oneself, assists oil recovery etc., underground heat
It is very huge to develop and use potential.China's geothermal energy resources enrich, but main exploitation middle-shallow layer geothermal energy resources at present, deep earth heart money
Source is urgently developed.
It is focused mostly on to the utilization of geothermal energy resources in hot-water type geothermal energy both at home and abroad at present, the exploitation of hot dry rock is still in experiment
Stage.Hot dry rock refers to that buried depth is more than the underground high heat rock mass of 2000m, temperature more than 150 DEG C, its main feature is that few in rock mass
Underground fluid exists.Hot dry rock is mainly used to extract its internal heat, for example, from ground through pit shaft to deep hot dry rock
Layer injection cold water, produces ground utilization, therefore, the percolation ability on deep hot dry rock stratum is to its internal energy after heat exchange
Utilization ratio is particularly significant.
At present, there are many technology of transformation stratum penetrating power developed, such as well shooting technology, nuclear explosion technology, height
Energy gas pressure break, hydraulic fracturing and Acidizing Technology etc..Common applied to geothermal reservoir is high enegry gas fracturing, hydraulic fracturing
And Acidizing Technology.
Well shooting method includes solid-state, liquid and gaseous state explosive detonation and detonation in pit shaft, it is therefore an objective to make pit shaft all
Exclosure layer generates many cracks, has not only eliminated epidermal damage caused by drilling process, but also intrinsic fracture system is made to connect with pit shaft
It connects.But the compression stress wave caused by well shooting makes well surrounding rock that expendable plastic deformation occur, and explodes initial stage
It re-closes or is blocked by explosion residue object when a large amount of cracks formed or the effect because residual stress field, make rock instead sometimes
Layer permeability decrease is only likely to improve yield, and pit shaft is easily damaged in well shooting in some cases.
Nuclear explosion oil recovery can cause and link up various cavities, so as to increase pit shaft surrounding rock permeability.Nuclear explosion energy
Crack huge, that reservoir will have certain thickness that could implement nuclear blast and take on a certain scale, nuclear device should have enough bury
Deeply to prevent radioactive release, and cannot be too deep, the crack for making generation to prevent rock static pressure re-closes.The U.S. is with before
The Soviet Union carried out the underground tests with nuclear device excitation oil-gas Layer in the 60-70 ages in 20th century, did not obtained commercial applications.China exists
The 80-90 ages in 20th century also once carry out the planning of nuclear explosion oil recovery and field experiment design, are not put to reality due to many-sided
It applies, and the economy of the method for nuclear explosion at present still has dispute.
High enegry gas fracturing is to grow up on the basis of explosion method pressure break in the 60-70 ages in 20th century.High energy gas pressure
It splits in pit shaft using gunpowder, propellant or Propellant And Explosive mixture, a large amount of high temperature generated using their detonations, high pressure
The wedging of gas, basic principle are medicament detonation rather than detonation, can be with control pressure peak value and rate of pressure rise.Whether can
Many cracks are generated, it is directly related with the well cylinder pressure rate of climb.But the crack that high enegry gas fracturing is formed is confined to closely
Well area is only combined with other technologies, could play its due effect in increasing yield and injection.
Hydraulic fracturing technology is exactly the pressure break for having using ground high-pressure pump by pit shaft to oil reservoir squeezing viscosity higher
Liquid.When the speed for injecting fracturing fluid is more than the absorbability of oil reservoir, then very high pressure is formed on the oil reservoir of shaft bottom, when this
When pressure is more than the fracture pressure of reservoir rock near shaft bottom, oil reservoir will be pressed off and generate crack, be reinjected with proppant
Load fluid ensure crack be not closed.But hydraulic fracturing activities can cause underground water pollution, fracturing process will contain big quantization
The fracturing fluid injection underground of additive is learned, has suppressed high pressure by formation breakdown, thus fracturing fluid understands polluted underground water body, and by oil gas
After reservoir rock pressure break, oil gas is also possible to channel in water table, and underground water is polluted.In addition, hydraulic fracturing is lived
Dynamic to be also possible to cause seismic activity, the equipment and material cost of pressure break are bigger, and there are certain risks of failure.
Acidification, which refers to, makees the dissolving and corrosion of tamper in rock cement or ground layer interface gap, crack etc. by acid solution
With, restore or improve ground layer interface gap and crack permeability.But in acidization, reacting the insoluble matter of generation may block up
Fill in interface gap, chemical addition agent may polluted underground water, can only in addition, Acidizing Technology is more demanding to the adaptability on stratum
Applied to stratum such as carbonate, application range is restricted.
It can be used for realizing that deep is done from the foregoing, it will be observed that there is presently no a kind of economical and effectives and the extensive method of use scope
The large-scale commercial of Re Yan stratum geothermal energy resources utilizes.
Invention content
In order to solve the above technical problems, the present invention provides a kind of thermal cracking seams for deep hot dry rock formation production
Method and system.The thermal-cracking method for hot dry rock exploitation can cost-effectively change deep hot dry rock stratum
It is kind, improve the utilization rate of deep earth heart energy.
In order to achieve the above objectives, the present invention provides a kind of thermal cracking seam sides for deep hot dry rock formation production
Method includes the following steps：
Target location injection oxidant, fuel and the water on stratum into injection well section, to the formation rock of target location
It is cracked, generates major fracture；
Continue to inject oxidant, fuel and water, oxidant and fuel is made to enter in the major fracture of generation, major fracture is carried out
Extension and cracking generate secondary crack, until the crack that the crack formed reaches scheduled development length or formed can
Make to be formed between injection well and producing well and connect；
Proppant and load fluid are pumped into major fracture after mixing, are then pumped into displacement fluid, proppant is made uniformly to divide
Cloth is in major fracture；
Closing well completes thermal cracking seam.Major fracture can close on proppant (i.e. main under the action of crustal stress after closing well
Proppant can be included when crack closure), form the channel of high flow conductivity.
Deep hot dry rock stratum is normally at earth's surface 2000m hereinafter, the environment (P of its high temperature and pressure>22.13MPa T>374
DEG C) water of injection can be made in a supercritical state, and the basic natures such as the density of supercritical water, viscosity, conductivity, dielectric constant
Can there be very big difference with light water, show the property similar to nonpolar organic compound.Therefore, supercritical water can with it is non-
Polar substances (such as hydro carbons) and other organic matters dissolve each other completely, and inorganic matter particularly salt, the ionization in supercritical water are normal
Number and solubility are but very low；Meanwhile supercritical water can completely dissolve each other with gases such as air, oxygen, nitrogen and carbon dioxide.When
The water of injection is in a supercritical state in underground, and in underground supercritical water oxidation can occur for fuel and oxidant at this time, with
The supercritical water of generation acts on formation rock together, cracks the formation rock around target location, forms crack.
In cracking process, on the one hand, a part of supercritical water can enter in newly generated crack since viscosity is smaller, make
Continue to crack in crack；On the other hand, oxidant, fuel and the water excessive due to continuing injection, oxidant and fuel can enter
In the major fracture of generation, and the reaction was continued in crack, so as to extend major fracture and crack, forms secondary crack, Jin Ergai
The physical property on kind deep hot dry rock stratum.After the thermal cracking effect seam using supercritical water, secondary crack is made due to thermal cracking
With that can form rough surface, crack wall surface cannot be closed completely, and have preferable flow conductivity.
Proppant and load fluid are pumped into major fracture after mixing, are subsequently pumped displacement fluid, proppant is made uniformly to divide
Cloth prevents crack closure in major fracture；Closing well, major fracture will be closed on proppant, so as to the stratum shape near shaft bottom
Into the sand packed fracture of the high flow conductivity with certain geometric dimension, well is made to achieve the purpose that increasing yield and injection.
In the above-mentioned methods, it is preferable that continue to inject oxidant, fuel and water, oxidant and fuel is made to enter generation
In major fracture, major fracture is extended and is cracked, generated secondary crack and include procedure below：
Well head is closed, after the reaction was complete after in-situ thermal cracking, opens well head, continues to inject oxidant and fuel, until institute
The crack of formation, which reaches scheduled development length or the crack formed, can connect formation between injection well and producing well.Its
In, the process of closing well reaction, the injection oxidant that drives a well and fuel can realize the secondary response again in underground crack, and this process can
It is multiple by recycling injection to repeat to operate according to stratum actual conditions, crack gradually extend to setting length or
Until crack is reached near producing well, effective connection between injection well and producing well is realized, improves in-place permeability.
In the above-mentioned methods, it is preferable that during thermal cracking seam, the cracking in crack and Drawing rate can pass through control
Water processed, fuel, oxidant charge velocity be adjusted.
In the above-mentioned methods, the injection well can be the straight well or radially horizontal well being located in the hot dry rock stratum of deep.
In the above-mentioned methods, the high-temperature supercritical fluid that combustion reaction generates can make Rock in Well expanded by heating, due to
The coefficient of thermal expansion of the various mineral constituents of rock interior is different, and thermal cracking effect can make rock interior generate uneven thermal stress, from
And form the extension crack controlled by stress direction.
In the above-mentioned methods, it is preferable that into injection well section the target location injection oxidant on stratum, fuel and water it
Before, this method is additionally included in the step of injecting into well tripping in thermal packer, and the thermal packer can prevent
Supercritical fluid reflux.
The present invention also provides a kind of thermal cracking seam system, which can be applied to above-mentioned hot tearing
Seam method is solved, the thermal cracking seam system includes feedway, coiled tubing, guider, anchor, high-pressure hose and combustion
Burn reaction unit；
The top of the coiled tubing is connected with the feedway, the bottom end of the coiled tubing and the guider
Top be connected, the bottom end of the guider is connected with the anchor, and the guider is set on the side wall of bottom end
There is communication port；Wherein, by combining, coiled tubing and high-pressure hose control and adjust fuel to guider, oxidant injects orientation；
Anchor is mainly used to improve tubing string stress, reduces tubing string fatigue damage, and control tubing string stretches, extension tube column life；
One end of the high-pressure hose is connected with the combustion reaction device, the other end pass through the communication port with it is described
Coiled tubing is connected；The combustion reaction device is equipped with outlet, and liquid and/or gas can be flowed out by outlet.
In above-mentioned thermal cracking seam system, it is preferred that the coiled tubing includes inner and outer tubes, and the outer tube is arranged
In the outside of said inner tube, cavity is formed between said inner tube and the outer tube.
In above-mentioned thermal cracking seam system, it is preferred that the feedway includes water supply installation, for fuel-device, confession
Oxidant device replaces liquid supplying device and load fluid feedway；Wherein, the water supply installation, for fuel-device, displacement fluid
Feedway and load fluid feedway are connected respectively with said inner tube；It is described to be connected for oxidant device with the outer tube
It connects.
In above-mentioned thermal cracking seam system, it is preferred that the system, which further includes, returns drain processing unit and production casing；Institute
State the outside that production casing is set in the coiled tubing, guider, anchor and combustion reaction device；It is described to return drain processing
Device is connected with the production casing, for handling returning the landwaste generated during drain and thermal cracking seam.
In above-mentioned thermal cracking seam system, it is preferred that the feedway further includes replacement liquid supplying device, the top
It is connected for liquid supplying device with said inner tube.
In above-mentioned thermal cracking seam system, it is preferred that one end of the coiled tubing is connected with the feedway
Pipeline be equipped with check valve.
In above-mentioned thermal cracking seam system, it is preferred that the thermal cracking seam system further includes packer, the packing
Device is in the cavity between production casing and coiled tubing.
In above-mentioned thermal cracking seam system, it is preferred that the thermal cracking seam system further includes manifold truck and instrument dress
It puts；Generally in practice of construction operation, the volume of feedway is larger, it is difficult to which mobile, manifold truck can realize feedway
It is mobile.
In above-mentioned thermal cracking seam system, it is preferred that the production casing and stratum are cemented together by cement sheath.
In a preferred embodiment, carrying out thermal cracking seam to xeothermic rock stratum using above-mentioned thermal cracking seam system can
To include the following steps：
The target location on stratum in injection well section will be placed under combustion reaction device, be filled using feedway to combustion reaction
Middle injection oxidant, fuel and water are put, the formation rock of target location is cracked, generates major fracture；
Continue to continue to inject oxidant and fuel into combustion reaction device using feedway, major fracture is made to extend and split
Solution generates secondary crack；
The charge velocity of oxidant, fuel and water is adjusted, the rate for being extended with control critical eigenvalue and being cracked, thermal cracking seam mistake
The landwaste generated in journey returns drain processing unit by production casing entrance and is handled；
Proppant and load fluid are pumped by ground pump group in major fracture after mixing, displacement fluid is then pumped into, makes
Proppant is evenly distributed in major fracture；
Stopping is pumped into, and closing well makes major fracture close on proppant, completes thermal cracking seam.
Beneficial effects of the present invention
Compared with prior art, technical solution provided by the invention mainly has advantages below：
(1) increasing yield and injection effect is preferable：After seam is carried out to rock near underground using supercritical water thermal cracking effect,
Supercritical water enters crack, secondary crack is continuously formed in crack, while fuel and oxidant enter crack reaction, extension is split
Seam and the secondary crack of generation further improve the penetrating power on stratum；
(2) safety is higher：Seam is carried out by reacting generation supercritical water in underground, had not both needed to ground pump group pressure
It is excessively high, it in turn avoids improving in-place permeability using the dangerous higher method such as underground explosive charge；
(3) cost of winning is relatively low：Generation supercritical water is reacted in underground using fuel, oxidant and water, avoids use
High pressure pump group and the shortcomings that needing water filling a large amount of to stratum, reduce cost of winning；
(4) system structure is relatively simple：The structure setting of the device and component on underground and ground is relatively simple, so as to
It can make this method that there is wider application range.
Description of the drawings
Fig. 1 is the structure diagram of thermal cracking seam system that embodiment 1 provides；
Fig. 2 is the schematic diagram that the thermal cracking seam method that embodiment 2 provides makes injection well be connected with producing well；
The schematic diagram in secondary crack that Fig. 3 is formed by the thermal cracking seam method that embodiment 2 provides.
Main Reference label declaration：
1：Replace liquid supplying device；2：Mixing device；3：Load fluid feedway；4：Water supply installation；5：For fuel-device；
6：For oxidant device；7：First check valve；8：Second check valve；9：Third check valve；10：4th check valve；11：5th is single
To valve；12：Return drain processing unit；13：Inner tube；14：Cement sheath；15：Outer tube；16：Production casing；17：Combustion reaction device；
18：Deep hot dry rock stratum；19：Superstratum；20：High-pressure hose；21：Guider；22：Anchor；23：Under cover stratum；24：
Supercritical water；25：Major fracture；26：Secondary crack；27：Packer；28：Producing well；29：Proppant.
Specific embodiment
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that the present invention can practical range restriction.
Embodiment 1
The present invention provides a kind of thermal cracking seam systems, and the structure diagram of the system is as indicated with 1.
Thermal cracking seam system includes feedway, coiled tubing, guider 21, anchor 22, high-pressure hose 20 and combustion
Burn reaction unit 17；Wherein, feedway include replace liquid supplying device 1, load fluid feedway 3, water supply installation 4, for combustion
Expect device 5 and for oxidant device 6；Coiled tubing is cylinder structure, and including inner tube 13 and outer tube 15, outer tube 15 is set in
The outside of inner tube 13 forms the toroidal cavity for allowing flow of media between inner tube 13 and outer tube 15；
Replace liquid supplying device 1, load fluid feedway 3, water supply installation 4 and for fuel-device 5 respectively with inner tube 13
Top is connected, and it is unidirectional that the first check valve 7, the second check valve 8, third check valve 9 and the 4th are respectively equipped on each connecting line
Valve 10；
It is connected for oxidant device 6 with the top of outer tube 15, connecting line is equipped with the 5th check valve 11；
The bottom end of coiled tubing is connected with the top of guider 21, and the bottom end of guider 21 is then connected with anchor 22
It connects；Side wall of the guider 21 close to bottom end is equipped with connector；
One end of high-pressure hose 20 is connected with combustion reaction device 17, the other end pass through guider 21 on connector with
Coiled tubing is connected；
Thermal cracking seam system provided in this embodiment also includes and returns drain processing unit 12 and production casing 16；Production set
Pipe sleeve 16 is located at the outside of coiled tubing, guider 21, anchor 22 and combustion reaction device 17, return drain processing unit 12 with
Production casing 16 is connected；During production operation, production casing 16 and stratum are cemented together by cement sheath 14；
Thermal cracking seam system provided in this embodiment can also include mixing device 2, and mixing device 2 is supplied with load fluid
Device 3 is connected.
Thermal cracking seam system provided in this embodiment is in addition it can comprising packer 27, being arranged on production casing 16
In the cavity formed between coiled tubing.
Embodiment 2
A kind of thermal cracking seam method for hot dry rock exploitation is present embodiments provided, this method is carried using embodiment 1
The thermal cracking seam system of confession carries out, and this method includes the following steps：
1) in the radially horizontal well bored using heating power jetting method, underground combustion reaction device 17 is placed in deep and is done
18 horizontal radial well well section (as shown in Figure 1) of Re Yan stratum；
Deep hot dry rock stratum is normally at earth's surface 2000m hereinafter, pressure is generally greater than 22.13MPa, as shown in Figure 1, deep
The top on portion hot dry rock stratum 18 is superstratum 19, and stratum 23 is covered in lower part under being；
2) pipeline for being separately turned on water supply installation 4, being connected for fuel-device 5 and for oxidant device 6 with coiled tubing
On the second check valve 8, the 4th check valve 10 and the 5th check valve 11, tripping in packer 27 notes into combustion reaction device 17
Enter oxidant 6, fuel 5 and water 4, make oxidant 6 and fuel 5 that combustion reaction occur in underground；
3) supercritical water 24 of generation is exported by combustion reaction device 17 and flowed out, and making underground, nearby rock is heated, and causes
Between mineral grain and internal cracked, continuing heating makes reservoir rock generate major fracture 25 (as shown in Figure 3)；
4) after reservoir rock generates major fracture 25, control reaction rate can be continued, make the supercritical water 24 of generation into
Enter major fracture 25, so as to persistently generate thermal cracking effect to reservoir rock in major fracture 25, make after generating major fracture 25 in reservoir,
Further generate secondary crack 26；
5) continue injection excessive fuel and oxidant, fuel and oxidant is made to enter the major fracture 25 of generation, split in master
The reaction was continued in seam 25, and crack is promoted further to extend and generate secondary crack 26；
Well head is closed, after the reaction was complete after in-situ thermal cracking, opens well head, continues to inject oxidant and fuel, this mistake
Journey can be repeated as many times and operate, until the crack that is formed reaches scheduled development length (as shown in Figure 1) or what is formed split
Seam, which can make to be formed between injection well and producing well 28, to be connected (as shown in Figure 2)；
Secondary crack to form rough surface since thermal cracking acts on, and crack wall surface cannot be closed completely, and has good
Good flow conductivity；
It, can be by adjusting the fuel being injected into combustion reaction device 17, oxidant and the injection of water in operating process
Rate with the temperature of supercritical water 24 that the combustion reaction is controlled to be heated, and then controls thermal cracking seam and fracture extension
Rate；For example, when being operated between injection well and producing well 28, injection rate can be improved, until the crack formed can energy
Enough realize the connection between two wells；
6) water supply installation 4, the pipeline being connected for fuel-device 5 and for oxidant device 6 with coiled tubing are closed respectively
On the second check valve 8, the 4th check valve 10 and the 5th check valve 11, be separately turned on replacing liquid supplying device 1 and load fluid and supply
The first check valve 7 and third check valve 9 on the pipeline being connected to device 3 with coiled tubing；
7) proppant 29 with load fluid is uniformly mixed using mixing device 2, then inputted in load fluid feedway 3,
The load fluid containing proppant 29 is pumped by deep hot dry rock stratum 18 by the inner tube 13 of coiled tubing using ground pump group；
8) displacement fluid replaced in liquid supplying device 1 is pumped into deep hot dry rock stratum using ground pump group, makes proppant
29 are evenly distributed in crack 25, closing well, and crack 25 is closed under crustal stress effect on proppant 29, and the secondary formed is split
Seam 26 to form rough surface since thermal cracking acts on, and crack wall surface cannot be closed completely, and increase the mistake of formation fluid
Flow area so as to which stratum forms the sand packed fracture of the high flow conductivity with certain geometric dimension near shaft bottom, improves ground
Layer permeability, makes well achieve the purpose that increasing yield and injection.
In conclusion there is the thermal cracking seam method and system provided by the invention suitable for hot dry rock exploitation volume increase to increase
The advantages that effect is good, safety is higher, cost of winning is relatively low, system structure is simple is noted, deep hot dry rock can be effectively improved
The property of layer, improves the utilization ratio of geothermal energy, has broad application prospects.
Claims (10)
1. a kind of thermal cracking seam method for deep hot dry rock formation production includes the following steps：
Into injection well section, target location injection oxidant, fuel and the water on stratum, carry out the formation rock of target location
Cracking generates major fracture；
Continue to inject oxidant, fuel and water, oxidant and fuel is made to enter in the major fracture of generation, major fracture is extended
And cracking, secondary crack is generated, until the crack formed reaches scheduled development length or the crack formed and can make note
Enter to be formed between well and producing well and connect；
Proppant and load fluid are pumped into major fracture after mixing, are then pumped into displacement fluid, is evenly distributed on proppant
In major fracture；
Closing well completes thermal cracking seam.
2. thermal cracking seam method according to claim 1, which is characterized in that during thermal cracking seam, crack
Cracking and Drawing rate are by the way that the charge velocity of water, fuel and oxidant is controlled to be adjusted.
3. thermal cracking seam method according to claim 1, which is characterized in that the injection well is positioned at deep hot dry rock
The straight well or radially horizontal well on stratum.
4. a kind of thermal cracking seam system, including feedway, coiled tubing, guider, anchor, high-pressure hose and burning
Reaction unit；
The top of the coiled tubing is connected with the feedway, the bottom end of the coiled tubing and the top of the guider
End is connected, and the bottom end of the guider is connected with the anchor, and the side wall of the guider is equipped with communication port；
One end of the high-pressure hose is connected with the combustion reaction device, the other end pass through the communication port with it is described continuous
Oil pipe is connected；The combustion reaction device is equipped with outlet.
5. thermal cracking seam system according to claim 4, which is characterized in that the coiled tubing is including inner tube and outside
Pipe, the outer tube sleeve are set on the outside of said inner tube, cavity are formed between said inner tube and the outer tube.
6. thermal cracking seam system according to claim 5, which is characterized in that the feedway include water supply installation,
For fuel-device, for oxidant device, replacement liquid supplying device and load fluid feedway；Wherein, the water supply installation, for combustion
Material device, replacement liquid supplying device and load fluid feedway are connected respectively with said inner tube；It is described for oxidant device with
The outer tube is connected.
7. thermal cracking seam system according to claim 4 or 5, which is characterized in that the system, which further includes, returns drain processing
Device and production casing；The production casing is set in the outer of the coiled tubing, guider, anchor and combustion reaction device
Portion, the drain processing unit of returning are connected with the production casing.
8. thermal cracking seam system according to claim 6, which is characterized in that the system further includes mixing device, described
Mixing device is connected with the load fluid feedway.
9. thermal cracking seam system according to claim 4, which is characterized in that one end of the coiled tubing and the confession
Check valve is equipped with to the pipeline that device is connected.
10. thermal cracking seam system according to claim 4, which is characterized in that the thermal cracking seam system further includes
Manifold truck and metering device.
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| CN108979609B (en) * | 2018-07-04 | 2019-05-28 | 中国石油大学(北京) | The method of deep hot dry rock high/low temperature fluid alternating spray auxiliary hydraulic fracturing seam |
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