CN106869890A - Staged fracturing of horizontal well experimental technique and pit shaft - Google Patents
Staged fracturing of horizontal well experimental technique and pit shaft Download PDFInfo
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- CN106869890A CN106869890A CN201710114967.6A CN201710114967A CN106869890A CN 106869890 A CN106869890 A CN 106869890A CN 201710114967 A CN201710114967 A CN 201710114967A CN 106869890 A CN106869890 A CN 106869890A
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- pit shaft
- sleeve pipe
- fluid injection
- liquid outlet
- injection pipeline
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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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention provides a kind of staged fracturing of horizontal well experimental technique and pit shaft, including：The blind hole of predetermined depth is got out on rock sample；The sleeve pipe of sealed bottom is fixed in blind hole, and multiple annular grooves are cut out in sleeve pipe；Wherein, the diameter with diameter greater than blind hole of each annular groove；Pit shaft is inserted in sleeve pipe；Pit shaft includes multiple liquid outlets, wherein, each liquid outlet is relative with an annular groove；And, each liquid outlet is separated by sealing ring with other liquid outlets in multiple liquid outlets, and each liquid outlet is also connected with a fluid injection pipeline；First each fluid injection pipeline is connected with infusion system, three-dimensional stress then is applied to rock sample；Fracturing fluid to fluid injection pipeline is injected by infusion system.The pit shaft that the present invention is provided is absolute construction, and be connected using plug-in between sleeve pipe, convenient to load and unload, it is to avoid the destruction caused to pit shaft during staged fracturing, realizes the recycling of pit shaft, has saved experimental cost, shortens experimental period.
Description
Technical field
The present invention relates to staged fracturing of horizontal well technology, more particularly to a kind of staged fracturing of horizontal well experimental technique and well
Cylinder.
Background technology
Staged fracturing of horizontal well is to improve one of key technology that low permeability pay is exploited.By to horizontal well diverse location
Multistage pressing crack construction is carried out, a plurality of hydraulic fracture can be in the earth formation formed, increases the contact area of pit shaft and stratum, so that greatly
The big initial production capacity for improving Oil/gas Well.During staged fracturing of horizontal well, interfered due to existing between a plurality of hydraulic fracture,
Cause crack expanded configuration and Extending Law sufficiently complex.Carry out staged fracturing of horizontal well simulated experiment, contribute to accurate understanding
Interfering between the crack propagation law and many cracks during staged fracturing of horizontal well, is that live staged fracturing is applied
The optimization of work scheme provides theoretical direction.
At present, using pit shaft is prefabricated in the sample more than staged fracturing of horizontal well simulated experiment, by fluid injection pipeline to well
Fracturing fluid is injected in cylinder to carry out staged fracturing simulated experiment.
But, in the prior art, pit shaft is mainly prefabricated in the sample by the means such as pouring, that is, pit shaft is with sample
Integral structure so that carry out often destroying pit shaft when staged fracturing of horizontal well is tested so that each pit shaft can only carry out one
Secondary experiment, considerably increases the cost of pit shaft making and the cycle of experiment.
The content of the invention
The present invention provides a kind of staged fracturing of horizontal well experimental technique and pit shaft, is tested as staged fracturing using rock sample
Sample, it is closer with actual production, while realizing the recycling of pit shaft.
The staged fracturing of horizontal well experimental technique that the present invention is provided, including：
The blind hole of predetermined depth is got out on rock sample；
The sleeve pipe of sealed bottom is fixed in the blind hole, and multiple annular grooves are cut out in described sleeve pipe；Wherein,
Each annular groove with diameter greater than or equal to the blind hole diameter；
Pit shaft is inserted in described sleeve pipe；The pit shaft includes multiple liquid outlets, wherein, each liquid outlet and an annular
Groove is relative；Described each liquid outlet is arranged with sealing ring respectively along the both sides of the pit shaft axial direction；It is described each go out liquid
Mouth is also connected with a fluid injection pipeline；
Each fluid injection pipeline is connected with infusion system, and three-dimensional stress is applied to the rock sample；
Fracturing fluid to the fluid injection pipeline is injected by the infusion system.
Further, it is described that the sleeve pipe of sealed bottom is fixed in the blind hole, and multiple is cut out in described sleeve pipe
Annular groove, including：
Described sleeve pipe is fixed in the blind hole, to injecting glue in the gap between described sleeve pipe and the blind hole,
The multiple annular groove is cut out in described sleeve pipe after glue is consolidated.
Further, the glue is epoxide resin AB glue.
Further, the pit shaft is closed with the matching size of described sleeve pipe.
Further, described each liquid outlet is connected with one fluid injection pipeline by welding manner, each liquid injection pipe
Line in the pit shaft by stretching out.
Described each liquid outlet is connected with one fluid injection pipeline by welding manner, and each fluid injection pipeline is by the well
Stretched out in cylinder.
The present invention provides a kind of pit shaft, and multiple liquid outlets are arranged at intervals with the pit shaft；
Each liquid outlet is connected with a fluid injection pipeline, and the fluid injection pipeline in the pit shaft by stretching out；The liquid injection pipe
Line is used to inject fracturing fluid；
Described each liquid outlet is respectively arranged with sealing ring along the axial both sides of the pit shaft；
The pit shaft is absolute construction.
The present invention provides a kind of staged fracturing of horizontal well experimental technique and pit shaft, including：Predetermined depth is got out on rock sample
Blind hole；The sleeve pipe of sealed bottom is inserted in the blind hole, and multiple annular grooves are cut out in the sleeve pipe；Wherein, each ring
Connected in star with diameter greater than or equal to the blind hole diameter；Pit shaft is inserted in the sleeve pipe；The pit shaft includes multiple liquid outlets, its
In, each liquid outlet is relative with an annular groove；Each liquid outlet is also connected with a fluid injection pipeline；To the respectively liquid injection pipe
Line is connected with infusion system, and three-dimensional stress is applied to the rock sample；Fracturing fluid to the fluid injection pipeline is injected by the infusion system.This
The staged fracturing of horizontal well method and pit shaft for providing are invented, pit shaft is absolute construction, and is connected using plug-in between sleeve pipe,
Convenient handling, it is to avoid the destruction caused to pit shaft during staged fracturing, realize the recycling of pit shaft, have saved experiment
Cost, shortens experimental period.
Brief description of the drawings
The flow chart of the staged fracturing of horizontal well method that Fig. 1 is provided for the present invention；
The side sectional view of the rock sample that Fig. 2 is provided for the present invention；
Fig. 3 is the sleeve pipe for providing of the invention and the side sectional view of rock sample package assembly；
The side sectional view of the pit shaft that Fig. 4 is provided for the present invention；
The top view of the pit shaft that Fig. 5 is provided for the present invention；
The side sectional view of the experimental configuration that Fig. 6 is provided for the present invention.
Description of reference numerals：
1- rock samples；
2- blind holes；
3- sleeve pipes；
4- annular grooves；
The first annular grooves of 401-；
The annular grooves of 402- second；
The annular grooves of 403- the 3rd；
5- pit shafts；
6- liquid outlets；
The liquid outlets of 601- first；
The liquid outlets of 602- second；
The liquid outlets of 603- the 3rd；
7- fluid injection pipelines；
701- the first fluid injection pipelines；
702- the second fluid injection pipelines；
The fluid injection pipelines of 703- the 3rd；
8- sealing rings.
Specific embodiment
The present invention provides a kind of staged fracturing of horizontal well method, the staged fracturing of horizontal well method that Fig. 1 is provided for the present invention
Flow chart.As shown in figure 1, the method may include：
S101, the blind hole for getting out on rock sample predetermined depth.
Specifically, the rock sample can be cut into by the sillar or artificial sillar of field acquisition, its mechanical property and reality
Formation core sample in the operation of border is same or like so that the reference value of experiment is higher, meanwhile, sillar is directly gathered with artificial system
Compared as sample, its cost of manufacture is lower, fabrication cycle is shorter.
For example, the side sectional view of the rock sample that Fig. 2 is provided for the present invention.Rock sample as shown in Figure 2, is internally provided with
One blind hole 2.
Wherein, the rock sample for example can be the cube rock sample that size is 300mm*300mm*300mm.
The blind hole 2 can be by rig the cube rock sample any one end face to being drilled through inside the rock sample 1, should
The diameter of blind hole 2 for example can be 26mm, and depth for example can be 235mm.
Based on the foregoing, it is desirable to explanation, above-mentioned rock sample, the shape of blind hole, size, quantity and position relationship etc. are only
The structure of a kind of example, rock sample, the blind hole that the present invention is provided etc. is not limited, and will not be repeated here.
S102, the sleeve pipe of sealed bottom is fixed in the blind hole, and multiple annular grooves are cut out in the sleeve pipe；Its
In, each annular groove with diameter greater than or equal to the blind hole diameter.
For example, Fig. 3 is the sleeve pipe 3 for providing of the invention and the side sectional view of the package assembly of rock sample 1.As shown in figure 3,
The sealed bottom of sleeve pipe 3, length is less than or equal to the depth of blind hole 2, and, sleeve pipe 3 is fixed in blind hole 2.
After the completion of sleeve pipe 3 is fixed, multiple annular grooves 4 need to be cut in the inwall of sleeve pipe 3, as shown in figure 3, annular groove 4
With diameter greater than or equal to blind hole 2 diameter so that after fracturing fluid is discharged by liquid outlet, directly act on annular groove 4, and thus
Produce crack.
Wherein, sleeve pipe 3 for example can be that length is 235mm, and external diameter is 25mm, and internal diameter is the cylindrical tube of 19mm.
The inner side of sleeve pipe 3 totally three annular grooves, respectively first annular groove 401, the second annular groove 402 and the 3rd
Annular groove 403；Wherein, first annular groove 401 is 200mm apart from the axial length of the end face of above-mentioned rock sample 1, and the second annular is recessed
Groove 402 is 150mm apart from the axial length of end face, and the 3rd annular groove 403 is 100mm apart from the axial length of end face；Every
The diameter of annular groove for example can be 30mm, and width for example can be 4mm.
Based on the foregoing, it is desirable to explanation, above-mentioned sleeve pipe, the shape of annular groove, size, quantity and position relationship are only
It is a kind of example, the structure of sleeve pipe, annular groove that the present invention is provided etc. is not limited, and will not be repeated here.
S103, pit shaft is inserted in the sleeve pipe；The pit shaft includes multiple liquid outlets, wherein, each liquid outlet and a ring
Connected in star is relative；Each liquid outlet is arranged with sealing ring respectively along the both sides of the pit shaft axial direction；Each liquid outlet is also
It is connected with a fluid injection pipeline；
For example, the side sectional view of the pit shaft that Fig. 4 is provided for the present invention.Fig. 5 bows for the pit shaft for providing of the invention
View.Pit shaft as shown in Figure 4, Figure 5, is arranged at intervals with multiple liquid outlets, the edge of liquid outlet 6 in the outside of pit shaft 5 on pit shaft 5
The axial both sides of pit shaft 5 are each provided with a sealing ring 8, and sealing ring 8 is used for its in a liquid outlet 6 and multiple liquid outlets
He separates liquid outlet 6.And, width of the spacing more than annular groove 4 between the both sides sealing circle 8 of liquid outlet 6.
For example, the side sectional view of the experimental configuration that Fig. 6 is provided for the present invention.As shown in fig. 6, pit shaft 5 is placed in set
In pipe 3, pit shaft 5 is fitted close with sleeve pipe 3, and liquid outlet 6 is corresponded with annular groove 4 so that be passed through the liquid of fluid injection pipeline 7
Body is drained into corresponding annular groove 4 through each liquid outlet 6, and is directly acted on inside rock sample 1.
Wherein, pit shaft 5 is fitted close with sleeve pipe 3, and the length of pit shaft 5 for example can be 230mm, and external diameter for example can be
18mm, internal diameter for example can be 14mm.The quantity of liquid outlet 6 is three, respectively the first liquid outlet 601, the second liquid outlet 602
With the 3rd liquid outlet 603；And first liquid outlet 601 apart from above-mentioned end face axial distance be 200mm, the second liquid outlet 602 away from
It is 150mm from the axial distance of above-mentioned end face, the 3rd liquid outlet 603 is 100mm apart from the axial distance of above-mentioned end face；So that the
One liquid outlet 601 is relative with first annular groove 401, and the second liquid outlet 602 is relative with the second annular groove 402；3rd goes out liquid
Mouth is relative with the 3rd annular groove 403.
The quantity of fluid injection pipeline 7 is three, respectively the first fluid injection pipeline 701, the second fluid injection pipeline 702 and the 3rd fluid injection
Pipeline 703, and length can for example be 2000mm.Wherein, the first fluid injection pipeline 701 is connected with the first liquid outlet 401, and second
Fluid injection pipeline 702 is connected with the second liquid outlet 402, and the 3rd fluid injection pipeline 703 is connected with the 3rd liquid outlet 403.
Based on the foregoing, it is desirable to the shape of explanation, above-mentioned pit shaft, liquid outlet, sealing ring etc., size, quantity and position
The relation of putting is only a kind of example, and the structure of pit shaft, liquid outlet, sealing ring that the present invention is provided etc. is not limited, herein no longer
Repeat.
S104, the fluid injection pipeline will be respectively connected with infusion system, and three-dimensional stress will be applied to the rock sample.
Can be mutual to three, sample by large scale true triaxial experimental provision specifically, applying three-dimensional stress to rock sample 1
Apply three each independent principal stresses on perpendicular face.
When using, rock sample 1 is positioned on large scale true triaxial experimental provision first, by each fluid injection pipeline 7 and large scale
The infusion system connection of true triaxial experimental provision.Subsequent start-up large scale true triaxial experimental provision, experimental provision is pushed by rock sample 1
Inside pressurizeed.
Constant three-dimensional stress is applied to rock sample 1, the three-dimensional stress can be preset value.
S105, fracturing fluid is injected by the infusion system to the fluid injection pipeline.
Specifically, can be according to default fluid injection order, note to the injection fracturing fluid of fluid injection pipeline 7 in a kind of example
Liquid discharge capacity, liquid filling pressure, fluid injection duration pump into fracturing fluid, treat to be split inside shale when fracturing fluid oozes out shale surface and can determine that
It is sewn to during up to predeterminated position, experiment can be terminated.
Can be arranged according to default fluid injection order, fluid injection to the injection fracturing fluid of fluid injection pipeline 7 in another example
Amount, liquid filling pressure, fluid injection duration pump into fracturing fluid, observe the experimental data that large scale true triaxial experimental provision is detected,
Such as pressure curve, if determining to occur in shale crack according to pressure curve or shale internal fissure reaches predeterminated position, can
Terminate experiment.
After the completion of experiment, three-dimensional stress is unloaded to rock sample 1, rock sample 1 is removed from large scale true triaxial experimental provision, with
Rock sample 1 is cut open afterwards, and takes out pit shaft 5, by CT (CT scan Computed Tomography, abbreviation
) and rock sample subdivision observes each section of expanded configuration of fracturing fracture CT.
By above-mentioned staged fracturing of horizontal well simulated experiment, contribute to splitting during accurate level of understanding well staged fracturing
Interfering with each other between seam propagation law and many cracks, refers to for the optimization of live staged fracturing arrangement and method for construction provides theory
Lead.
The present invention provides a kind of staged fracturing of horizontal well method, including：The blind hole of predetermined depth is got out on rock sample；The bottom of by
The sleeve pipe of portion's sealing is inserted in blind hole, and multiple annular grooves are cut out in sleeve pipe；Wherein, each annular groove with diameter greater than
Or equal to the diameter of blind hole；Pit shaft is inserted in sleeve pipe；Pit shaft includes multiple liquid outlets, wherein, each liquid outlet and a ring
Connected in star is relative；And, each liquid outlet is separated by sealing ring with other liquid outlets in multiple liquid outlets, and each liquid outlet is also
It is connected with a fluid injection pipeline；First each fluid injection pipeline is connected with infusion system, three-dimensional stress then is applied to rock sample；By pump
Injection system injects fracturing fluid to fluid injection pipeline.Staged fracturing of horizontal well method and pit shaft that the present invention is provided, pit shaft are tied for independent
Structure, and being connected using plug-in between sleeve pipe, convenient handling, it is to avoid made to pit shaft and fluid injection pipeline during staged fracturing
Into destruction, experiment can take out pit shaft and fluid injection pipeline after terminating, and realize the recycling of pit shaft and fluid injection pipeline, save
Experimental cost.
Optionally, in above-mentioned steps S102, the sleeve pipe 3 of sealed bottom is fixed in blind hole 2, and is cut out in sleeve pipe 3
Multiple annular grooves 4, including：
Sleeve pipe 3 is fixed in blind hole 2, to glue is injected in the gap between sleeve pipe 3 and blind hole 2, after after glue consolidation
Multiple annular grooves 4 are cut out in sleeve pipe 3.
It is sealing specifically, to glue is injected in the gap between sleeve pipe 3 and blind hole 2, sleeve pipe 3 is fixed in blind hole 2
The sealing of circle provides a smooth inside, while ensureing that fracturing fluid will not be along sleeve pipe and blind hole when a groove flows thereto
Between gap flow to other grooves ensure that each fracturing section between absolute packing, so as to ensure that the true of experimental result has
Effect.
Optionally, the glue is epoxide resin AB glue.
Specifically, sleeve pipe 3 can be polyethylene material, sleeve pipe 3 can be fixed in blind hole 2 by epoxide resin AB glue.
When using, the epoxide resin AB glue that will directly can have been configured is poured in the gap between sleeve pipe 3 and blind hole 2, treats that glue is consolidated
Afterwards, multiple annular grooves are respectively cut out in default tubing depth, if cutting annular groove causes analog casing inwall thick
It is rough, suitably internal surface of sleeve pipe can be polished.
Be fixed on sleeve pipe 3 in blind hole 2 by epoxide resin AB glue by the above embodiment of the present invention, it is ensured that staged fracturing reality
Test the authentic and valid of result.
Further, pit shaft 5 is closed with the matching size of sleeve pipe 3.
Specifically, the internal diameter of sleeve pipe 3 for example can be 19mm, the external diameter of pit shaft 5 for example can be 18mm, and pit shaft 5 is inserted into set
In pipe 3 so that sleeve pipe 3 can be in close contact with the sealing ring 8 of setting on pit shaft 5, when carrying out a certain section of fracturing experiments, it is to avoid
Fracturing fluid is flowed at other annular grooves from the gap of pit shaft 5 and sleeve pipe 3.
Meanwhile, pit shaft 5 by the way of separately positioned, only need to take out pit shaft with sleeve pipe 3 at the end of staged fracturing is tested
5, you can realize the recycling of pit shaft 5 and fluid injection pipeline 7, cost is saved, and simplify experimental implementation.
The above embodiment of the present invention, when staged fracturing is tested, is kept away by setting the pit shaft 5 closed with the matching size of sleeve pipe 3
Exempt from fracturing fluid and influence of the crossfire to experimental result has been produced between each annular groove, meanwhile, pit shaft 5 is separately positioned with sleeve pipe 3
Mode, realize the recycling of pit shaft 5, saved experimental cost, simplify experimental implementation, so as to improve experiment effect
Rate.
Optionally, each liquid outlet 6 is connected with a fluid injection pipeline 7 by welding manner, and each fluid injection pipeline 7 is by pit shaft
Stretched out in 5.
Specifically, connecting liquid outlet 6 and fluid injection pipeline 7 by way of welding so that connection more closely, is passed through liquid injection pipe
The pressure break liquid energy of line 7 is directly discharged by liquid outlet 6, when being tested so as to avoid staged fracturing, the excessive pressure break for causing of pressure
Liquid is revealed.
Based on the foregoing, it is desirable to explanation, the connected mode of above-mentioned welding is only a kind of example, and what the present invention was provided goes out liquid
Mouth is not limited with the connected mode of fluid injection pipeline, will not be repeated here.
The present invention provides a kind of pit shaft 5, and multiple liquid outlets are arranged at intervals with pit shaft 5；
Each liquid outlet 6 is connected with a fluid injection pipeline 7, and by being stretched out in pit shaft 5, fluid injection pipeline 7 is used to note fluid injection pipeline 7
Enter fracturing fluid；
Each liquid outlet 6 is respectively arranged with sealing ring 8 along the axial both sides of pit shaft 5.
Pit shaft 5 is absolute construction.
Specifically, multiple liquid outlet interval settings, and each liquid outlet is by being set in the sealing ring 8 of the outer wall of pit shaft 5
Separate with other liquid outlets 6, used cooperatively with sleeve pipe 3 during experiment, realize the segmentation to pit shaft 5, and each liquid outlet 6 is distinguished
Connected from different fluid injection pipelines 7, realize the function of separating fluid injection.
Optionally, sealing ring 8 can be O-ring seal.When using, sealing ring 8 be respectively fitted over the outside of pit shaft 5 each go out
The both sides of liquid mouthful 6, for each liquid outlet 6 to be separated so that it is recessed that the fracturing fluid discharged through liquid outlet 6 can only enter corresponding annular
In groove 4, it is to avoid fracturing fluid crossfire realizes the staged fracturing of horizontal well so that experimental result is more to other annular grooves 4
Accurately.
The above embodiment of the present invention is used as separating device by setting sealing ring 8, realizes the staged fracturing of horizontal well, together
When can further gap between seal shaft 5 and sleeve pipe 3, it is to avoid fracturing fluid passes through from the gap, it is ensured that staged fracturing
Experimental result it is authentic and valid.
When using, each fluid injection pipeline 7 is connected with the infusion system of large scale true triaxial experimental provision.By controlling infusion
The valve of system, can control the fluid injection order of fluid injection pipeline 7, by changing fluid injection order, observation large scale true triaxial experiment dress
The pressure curve inside the rock sample measured is put, the crack propagation law during staged fracturing of horizontal well can be drawn and a plurality of split
Situation is interfered with each other between seam, so that for the optimization of live staged fracturing arrangement and method for construction provides theoretical direction.
The present invention provides a kind of pit shaft, and multiple liquid outlets are arranged at intervals with pit shaft；Each liquid outlet and a liquid injection pipe
Line is connected, and by being stretched out in pit shaft, fluid injection pipeline is used to for fracturing fluid to derive liquid outlet fluid injection pipeline；One liquid outlet along pit shaft outside
The axial both sides of side are each provided with a sealing ring, and sealing ring is used for a liquid outlet by sealing ring and multiple liquid outlets
Other liquid outlets separate.The pit shaft that the present invention is provided is by using a plurality of fluid injection pipeline and the separately positioned realization of multiple liquid injection ports
The separation fluid injection of different fracturing sections, by staged fracturing of horizontal well simulated experiment, contributes to accurate level of understanding well segmentation pressure
Interfering with each other between the crack propagation law and many cracks during splitting, is the optimization of live staged fracturing arrangement and method for construction
There is provided theoretical direction.Shaft structure is simple simultaneously, easy to process, it is possible to reuse, and has saved cost, simplifies experiment
Operation, improves efficiency.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (6)
1. a kind of staged fracturing of horizontal well experimental technique, it is characterised in that including：
The blind hole of predetermined depth is got out on rock sample；
The sleeve pipe of sealed bottom is fixed in the blind hole, and multiple annular grooves are cut out in described sleeve pipe；Wherein, each
The diameter with diameter greater than the blind hole of annular groove；
Pit shaft is inserted in described sleeve pipe；The pit shaft includes multiple liquid outlets, wherein, each liquid outlet and an annular groove
Relatively；Described each liquid outlet is arranged with sealing ring respectively along the both sides of the pit shaft axial direction；Described each liquid outlet is also
It is connected with a fluid injection pipeline；
Each fluid injection pipeline is connected with infusion system, and three-dimensional stress is applied to the rock sample；
Fracturing fluid to the fluid injection pipeline is injected by the infusion system.
2. method according to claim 1, it is characterised in that described that the sleeve pipe of sealed bottom is fixed on the blind hole
It is interior, and multiple annular grooves are cut out in described sleeve pipe, including：
Described sleeve pipe is inserted in the blind hole, to glue is injected in the gap between described sleeve pipe and the blind hole, glue is treated
The multiple annular groove is cut out after consolidation in described sleeve pipe.
3. method according to claim 2, it is characterised in that the glue is epoxide resin AB glue.
4. method according to claim 1, it is characterised in that the pit shaft is closed with the matching size of described sleeve pipe.
5. method according to claim 1, it is characterised in that described each liquid outlet passes through with one fluid injection pipeline
Welding manner is connected, and each fluid injection pipeline in the pit shaft by stretching out.
6. a kind of pit shaft, it is characterised in that multiple liquid outlets are arranged at intervals with the pit shaft；
Each liquid outlet is connected with a fluid injection pipeline, and the fluid injection pipeline in the pit shaft by stretching out；The fluid injection pipeline is used
In injection fracturing fluid；
Described each liquid outlet is respectively arranged with sealing ring along the axial both sides of the pit shaft；
The pit shaft is absolute construction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710114967.6A CN106869890B (en) | 2017-02-28 | 2017-02-28 | Horizontal well fracturing experimental method and pit shaft |
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| CN201710114967.6A CN106869890B (en) | 2017-02-28 | 2017-02-28 | Horizontal well fracturing experimental method and pit shaft |
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| CN106869890B CN106869890B (en) | 2018-08-07 |
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| CN109826608A (en) * | 2019-04-08 | 2019-05-31 | 中国科学院地质与地球物理研究所 | A kind of segmented fracturing device |
| CN110617046A (en) * | 2019-10-17 | 2019-12-27 | 中国石油大学(华东) | Shaft device for horizontal well multistage staged fracturing physical simulation experiment |
| CN110763532A (en) * | 2019-09-17 | 2020-02-07 | 中国石油天然气股份有限公司 | Perforating core preparation method for developing hydrofracture physical simulation experiment based on natural outcrop |
| CN110926954A (en) * | 2019-12-16 | 2020-03-27 | 重庆大学 | Staged hydraulic fracturing test device and test method under true triaxial condition |
| CN111411929A (en) * | 2019-12-26 | 2020-07-14 | 大庆油田有限责任公司 | Horizontal well immovable string staged fracturing physical simulation tool and zipper type fracturing simulation experiment method |
| CN113944452A (en) * | 2021-10-13 | 2022-01-18 | 中国科学院武汉岩土力学研究所 | Hydraulic fracturing casing pipe fracture research method |
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