CN106869890B - Horizontal well fracturing experimental method and pit shaft - Google Patents
Horizontal well fracturing experimental method and pit shaft Download PDFInfo
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- CN106869890B CN106869890B CN201710114967.6A CN201710114967A CN106869890B CN 106869890 B CN106869890 B CN 106869890B CN 201710114967 A CN201710114967 A CN 201710114967A CN 106869890 B CN106869890 B CN 106869890B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 239000012530 fluid Substances 0.000 claims abstract description 92
- 238000002347 injection Methods 0.000 claims abstract description 89
- 239000007924 injection Substances 0.000 claims abstract description 89
- 239000011435 rock Substances 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 238000010276 construction Methods 0.000 claims abstract description 9
- 239000003292 glue Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 238000007596 consolidation process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000004323 axial length Effects 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VEMKTZHHVJILDY-UHFFFAOYSA-N resmethrin Chemical compound CC1(C)C(C=C(C)C)C1C(=O)OCC1=COC(CC=2C=CC=CC=2)=C1 VEMKTZHHVJILDY-UHFFFAOYSA-N 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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
A kind of horizontal well fracturing experimental method of present invention offer and pit shaft, including：The blind hole of predetermined depth is drilled out on rock sample；The casing of sealed bottom is fixed in blind hole, and cuts out multiple annular grooves in casing；Wherein, the diameter of each annular groove is more than diameter of blind hole；Pit shaft is placed in casing；Pit shaft includes multiple liquid outlets, wherein each liquid outlet is opposite with an annular groove；And each liquid outlet is separated by sealing ring and other liquid outlets in multiple liquid outlets, each liquid outlet is also connect with a fluid injection pipeline；Each fluid injection pipeline is connect with pump injection system first, three-dimensional stress then is applied to rock sample；Fracturing fluid is injected to fluid injection pipeline by pumping injection system.Pit shaft provided by the invention is absolute construction, and is connect using plug-in between casing, and handling are facilitated, and avoids the destruction caused by pit shaft during staged fracturing, realizes the recycling of pit shaft, saved experimental cost, shorten experimental period.
Description
Technical field
The present invention relates to horizontal well fracturing technology more particularly to a kind of horizontal well fracturing experimental method and wells
Cylinder.
Background technology
Horizontal well fracturing is one of the key technology for improving low permeability pay exploitation.By to horizontal well different location
Multistage pressing crack construction is carried out, a plurality of hydraulic fracture can be formed in the earth formation, increases the contact area of pit shaft and stratum, to big
The big initial production capacity for improving oil/gas well.During horizontal well fracturing, interfered with each other due to existing between a plurality of hydraulic fracture,
Cause crack expanded configuration and Extending Law sufficiently complex.Carry out horizontal well fracturing simulated experiment, helps accurately to recognize
Interfering with each other between the crack propagation law and many cracks during horizontal well fracturing is applied for live staged fracturing
The optimization of work scheme provides theoretical direction.
Currently, horizontal well fracturing simulated experiment mostly use pit shaft is prefabricated in the sample, 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 horizontal well fracturing experiment so that each pit shaft can only carry out one
Secondary experiment considerably increases the period of the cost and experiment of pit shaft making.
Invention content
A kind of horizontal well fracturing experimental method of present invention offer and pit shaft, are tested using rock sample as staged fracturing
Sample, it is closer with actual production, while realizing the recycling of pit shaft.
Horizontal well fracturing experimental method provided by the invention, including：
The blind hole of predetermined depth is drilled out on rock sample；
The casing of sealed bottom is fixed in the blind hole, and cuts out multiple annular grooves in described sleeve pipe；Wherein,
The diameter of each annular groove is greater than or equal to the diameter of blind hole；
Pit shaft is placed in described sleeve pipe；The pit shaft includes multiple liquid outlets, wherein each liquid outlet and an annular
Groove is opposite；Each liquid outlet is arranged with sealing ring respectively along the both sides of the pit shaft axial direction；It is described each to go out liquid
Mouth is also connect with a fluid injection pipeline；
Each fluid injection pipeline is connect with pump injection system, and three-dimensional stress is applied to the rock sample；
Fracturing fluid is injected to the fluid injection pipeline by the pump injection system.
Further, described that the casing of sealed bottom is fixed in the blind hole, and cut out in described sleeve pipe multiple
Annular groove, including：
Described sleeve pipe is fixed in the blind hole, injects glue into the gap between described sleeve pipe and the blind hole,
The multiple annular groove is cut out in described sleeve pipe after glue consolidation.
Further, the glue is epoxy resin AB glue.
Further, the pit shaft and the matching size of described sleeve pipe close.
Further, each liquid outlet is connect with one fluid injection pipeline by welding manner, each liquid injection pipe
Line in the pit shaft by stretching out.
Each liquid outlet is connect with one fluid injection pipeline by welding manner, and each fluid injection pipeline is by the well
It is stretched out in cylinder.
The present invention provides a kind of pit shaft, and multiple liquid outlets are arranged at intervals on the pit shaft；
Each liquid outlet is connect with a fluid injection pipeline, and the fluid injection pipeline in the pit shaft by stretching out；The liquid injection pipe
Line is for injecting fracturing fluid；
Each liquid outlet is respectively arranged with sealing ring along the axial both sides of the pit shaft；
The pit shaft is absolute construction.
A kind of horizontal well fracturing experimental method of present invention offer and pit shaft, including：Predetermined depth is drilled out on rock sample
Blind hole；The casing of sealed bottom is placed in the blind hole, and cuts out multiple annular grooves in the casing；Wherein, Mei Gehuan
The diameter of connected in star is greater than or equal to the diameter of blind hole；Pit shaft is placed in the casing；The pit shaft includes multiple liquid outlets,
In, each liquid outlet is opposite with an annular groove；Each liquid outlet is also connect with a fluid injection pipeline；To the respectively liquid injection pipe
Line is connect with pump injection system, applies three-dimensional stress to the rock sample；Fracturing fluid is injected to the fluid injection pipeline by the pump injection system.This
It is absolute construction to invent the horizontal well fracturing method provided and pit shaft, pit shaft, and is connect using plug-in between casing,
Facilitate handling, avoids the destruction caused by pit shaft during staged fracturing, realize the recycling of pit shaft, saved experiment
Cost shortens experimental period.
Description of the drawings
Fig. 1 is the flow chart of horizontal well fracturing method provided by the invention；
Fig. 2 is the side sectional view of rock sample provided by the invention；
Fig. 3 is the side sectional view of casing provided by the invention and rock sample package assembly；
Fig. 4 is the side sectional view of pit shaft provided by the invention；
Fig. 5 is the vertical view of pit shaft provided by the invention；
Fig. 6 is the side sectional view of experimental configuration provided by the invention.
Reference sign：
1- rock samples；
2- blind holes；
3- casings；
4- annular grooves；
401- first annular grooves；
402- second annular grooves；
403- third annular grooves；
5- pit shafts；
6- liquid outlets；
The first liquid outlets of 601-；
The second liquid outlets of 602-；
603- third liquid outlets；
7- fluid injection pipelines；
701- the first fluid injection pipelines；
702- the second fluid injection pipelines；
703- third fluid injection pipelines；
8- sealing rings.
Specific implementation mode
The present invention provides a kind of horizontal well fracturing method, and Fig. 1 is horizontal well fracturing method provided by the invention
Flow chart.As shown in Figure 1, this method may include：
S101, the blind hole that predetermined depth is drilled out on rock sample.
Specifically, the rock sample can be cut by the sillar or artificial sillar of field acquisition, mechanical property and reality
Formation core sample in the operation of border is same or similar so that the reference value higher of experiment, meanwhile, directly acquire sillar and artificial system
It is compared as sample, cost of manufacture is lower, fabrication cycle is shorter.
For example, Fig. 2 is the side sectional view of rock sample provided by the invention.Rock sample as shown in Figure 2, is internally provided with
One blind hole 2.
Wherein, which for example can be the cube rock sample that size is 300mm*300mm*300mm.
The blind hole 2 can be in any one end face of the cube rock sample by drilling machine to drilling through inside the rock sample 1, should
2 diameter of blind hole for example can be 26mm, and depth for example can be 235mm.
Based on the foregoing, it is desirable to which 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 provided by the invention, blind hole etc. is not limited, and details are not described herein.
S102, the casing of sealed bottom is fixed in the blind hole, and cuts out multiple annular grooves in the casing；Its
In, the diameter of each annular groove is greater than or equal to the diameter of blind hole.
For example, Fig. 3 is the side sectional view of casing 3 and 1 package assembly of rock sample provided by the invention.As shown in figure 3,
3 sealed bottom of casing, length are less than or equal to the depth of blind hole 2, and, casing 3 is fixed in blind hole 2.
After the completion of casing 3 is fixed, multiple annular grooves 4 need to be cut in 3 inner wall of casing, as shown in figure 3, annular groove 4
Diameter is greater than or equal to the diameter of blind hole 2 so that after fracturing fluid is discharged by liquid outlet, directly acts on annular groove 4, and thus
Generate crack.
Wherein, it is 235mm that casing 3, which for example can be length, and outer diameter 25mm, internal diameter is the cylindrical tube of 19mm.
The inside of casing 3 totally three annular grooves, respectively first annular groove 401, second annular groove 402 and third
Annular groove 403；Wherein, axial length of the first annular groove 401 apart from 1 end face of above-mentioned rock sample is 200mm, and the second annular is recessed
Axial length of the slot 402 apart from end face is 150mm, and axial length of the third annular groove 403 apart from end face is 100mm；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 casing, the shape of annular groove, size, quantity and position relationship are only
For a kind of example, the structure of casing provided by the invention, annular groove etc. is not limited, and details are not described herein.
S103, pit shaft is placed in the casing；The pit shaft includes multiple liquid outlets, wherein each liquid outlet and a ring
Connected in star is opposite；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 connect with a fluid injection pipeline；
For example, Fig. 4 is the side sectional view of pit shaft provided by the invention.Fig. 5 is bowing for pit shaft provided by the invention
View.Pit shaft as shown in Figure 4, Figure 5 is arranged at intervals with multiple liquid outlets, 6 edge of liquid outlet in 5 outside of pit shaft 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 the spacing between 6 both sides sealing circle 8 of liquid outlet is more than the width of annular groove 4.
For example, Fig. 6 is the side sectional view of experimental configuration provided by the invention.As shown in fig. 6, pit shaft 5 is placed in set
In pipe 3, pit shaft 5 is fitted close with casing 3, and liquid outlet 6 is corresponded with annular groove 4 so that is passed through the liquid of fluid injection pipeline 7
Body is drained into through each liquid outlet 6 in corresponding annular groove 4, and is directly acted on inside rock sample 1.
Wherein, pit shaft 5 is fitted close with casing 3, and 5 length of pit shaft for example can be 230mm, and outer 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 third liquid outlet 603；And first axial distance of the liquid outlet 601 apart from above-mentioned end face be 200mm, the second liquid outlet 602 away from
Axial distance from above-mentioned end face is 150mm, and axial distance of the third liquid outlet 603 apart from above-mentioned end face is 100mm；So that the
One liquid outlet 601 is opposite with first annular groove 401, and the second liquid outlet 602 is opposite with second annular groove 402；Third goes out liquid
Mouth is opposite with third 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 third fluid injection
Pipeline 703, and length for example can be 2000mm.Wherein, the first fluid injection pipeline 701 is connect with the first liquid outlet 401, and second
Fluid injection pipeline 702 is connect with the second liquid outlet 402, and third fluid injection pipeline 703 is connect with third liquid outlet 403.
Based on the foregoing, it is desirable to explanation, the shape, size, quantity and position of above-mentioned pit shaft, liquid outlet, sealing ring etc.
The relationship of setting is only a kind of example, and the structure of pit shaft provided by the invention, liquid outlet, sealing ring etc. is not limited, herein no longer
It repeats.
S104, it will respectively the fluid injection pipeline be connect with pump injection system, and three-dimensional stress is 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 separate three principal stresses on perpendicular face.
In use, rock sample 1 is positioned on large scale true triaxial experimental provision first, by each fluid injection pipeline 7 and large scale
The pump injection system of true triaxial experimental provision connects.Rock sample 1 is pushed into experimental provision by subsequent start-up large scale true triaxial experimental provision
Inside pressurize.
Apply constant three-dimensional stress to rock sample 1, which can be preset value.
S105, fracturing fluid is injected to the fluid injection pipeline by the pump injection system.
Specifically, in a kind of example, it can be according to preset fluid injection order, note to inject fracturing fluid to fluid injection pipeline 7
Liquid discharge capacity, liquid filling pressure, fluid injection duration are pumped into fracturing fluid, wait for splitting inside shale when fracturing fluid exudation shale surface can determine
When being sewn to up to predeterminated position, it can terminate to test.
In another example, it can be arranged according to preset fluid injection order, fluid injection to inject fracturing fluid to fluid injection pipeline 7
Amount, liquid filling pressure, fluid injection duration are pumped into fracturing fluid, observe the experimental data that large scale true triaxial experimental provision detects,
Such as pressure curve, there is crack or when shale internal fissure reaches predeterminated position if being determined in shale according to pressure curve, it 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 splitted afterwards, and takes out pit shaft 5, passes through CT (CT scan Computed Tomography, abbreviation
CT) and rock sample subdivision observes the expanded configuration of each section of fracturing fracture.
By above-mentioned horizontal well fracturing simulated experiment, contribute to splitting during accurate level of understanding well staged fracturing
Interfering with each other between seam propagation law and many cracks provides theory and refers to for the optimization of scene staged fracturing arrangement and method for construction
It leads.
The present invention provides a kind of horizontal well fracturing method, including：The blind hole of predetermined depth is drilled out on rock sample；The bottom of by
In the casing merging blind hole of portion's sealing, and multiple annular grooves are cut out in casing；Wherein, the diameter of each annular groove is more than
Or it is equal to diameter of blind hole；Pit shaft is placed in casing；Pit shaft includes multiple liquid outlets, wherein each liquid outlet and a ring
Connected in star is opposite；And each liquid outlet is separated by sealing ring and other liquid outlets in multiple liquid outlets, each liquid outlet is also
It is connect with a fluid injection pipeline；Each fluid injection pipeline is connect with pump injection system first, three-dimensional stress then is applied to rock sample；Pass through pump
Injection system injects fracturing fluid to fluid injection pipeline.Horizontal well fracturing method provided by the invention and pit shaft, pit shaft are independent tie
Structure, and connect using plug-in between casing, facilitate handling, avoids staged fracturing and pit shaft and fluid injection pipeline are made in the process
At destruction, pit shaft and fluid injection pipeline can be taken out after experiment, realize the recycling of pit shaft and fluid injection pipeline, saved
Experimental cost.
Optionally, in above-mentioned steps S102, the casing 3 of sealed bottom is fixed in blind hole 2, and is cut out in casing 3
Multiple annular grooves 4, including：
Casing 3 is fixed in blind hole 2, injects glue into the gap between casing 3 and blind hole 2, after glue consolidation
Multiple annular grooves 4 are cut out in casing 3.
Specifically, injecting glue into the gap between casing 3 and blind hole 2, casing 3 is fixed in blind hole 2, for sealing
The sealing of circle provides a smooth inside, while ensureing that fracturing fluid will not be along casing and blind hole when a groove flows thereto
Between gap flow to other grooves and ensure that absolute packing between each fracturing section, to ensure that the true of experimental result has
Effect.
Optionally, which is epoxy resin AB glue.
Specifically, casing 3 can be polyethylene material, casing 3 can be fixed in blind hole 2 by epoxy resin AB glue.
In use, directly the epoxy resin AB glue configured can be poured in the gap between casing 3 and blind hole 2, wait for that glue consolidates
Afterwards, multiple annular grooves are respectively cut out in preset tubing depth, if cutting annular groove causes analog casing inner wall thick
It is rough, it can suitably polish internal surface of sleeve pipe.
Casing 3 is fixed in blind hole 2 by the above embodiment of the present invention by epoxy resin AB glue, ensure that staged fracturing reality
Test the authentic and valid of result.
Further, pit shaft 5 and the matching size of casing 3 close.
Specifically, 3 internal diameter of casing for example can be 19mm, 5 outer diameter of pit shaft for example can be 18mm, and pit shaft 5 is placed in and is covered
In pipe 3 so that casing 3 can be in close contact with the sealing ring 8 being arranged on pit shaft 5, when carrying out a certain section of fracturing experiments, be avoided
Fracturing fluid is flowed to from the gap of pit shaft 5 and casing 3 from other annular grooves.
Meanwhile pit shaft 5 and casing 3 only need to take out pit shaft by the way of separately positioned at the end of staged fracturing is tested
5, you can the recycling for realizing pit shaft 5 and fluid injection pipeline 7 has saved cost, and simplify experimental implementation.
The above embodiment of the present invention is kept away by the way that the pit shaft 5 closed with 3 matching size of casing is arranged when staged fracturing is tested
Exempt from fracturing fluid and generates influence of the crossfire to experimental result between each annular groove, meanwhile, pit shaft 5 and casing 3 are separately positioned
Mode, realize the recycling of pit shaft 5, saved experimental cost, simplify experimental implementation, to improve experiment effect
Rate.
Optionally, each liquid outlet 6 is connect with a fluid injection pipeline 7 by welding manner, and each fluid injection pipeline 7 is by pit shaft
It is stretched out in 5.
Specifically, connecting liquid outlet 6 and fluid injection pipeline 7 by welding so that connection is closer, 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, pressure break caused by pressure is excessive
Liquid is revealed.
Based on the foregoing, it is desirable to explanation, the connection type of above-mentioned welding is only a kind of example, it is provided by the invention go out liquid
The connection type of mouth and fluid injection pipeline is not limited, and details are not described herein.
The present invention provides a kind of pit shaft 5, and multiple liquid outlets are arranged at intervals on pit shaft 5；
Each liquid outlet 6 is connect with a fluid injection pipeline 7, and fluid injection pipeline 7 in pit shaft 5 by stretching out, and fluid injection pipeline 7 is for noting
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 sealing ring 8 of the liquid outlet by being set in 5 outer wall of pit shaft
It is separated with other liquid outlets 6, when experiment is used cooperatively with casing 3, realizes the segmentation to pit shaft 5, and each liquid outlet 6 is distinguished
It is connected from different fluid injection pipelines 7, realizes the function of separation fluid injection.
Optionally, sealing ring 8 can be O-ring seal.Go out in use, sealing ring 8 is respectively fitted over each of 5 outside of pit shaft
The both sides of liquid mouth 6, for separating each liquid outlet 6 so that it is recessed that the fracturing fluid being discharged through liquid outlet 6 can only enter corresponding annular
In slot 4, fracturing fluid crossfire is avoided to other annular grooves 4, realizes the staged fracturing of horizontal well so that experimental result is more
Accurately.
The above embodiment of the present invention is used as separating device by the way that sealing ring 8 is arranged, and realizes the staged fracturing of horizontal well, together
When can further gap between seal shaft 5 and casing 3, avoid fracturing fluid from passing through out of this gap, ensure that staged fracturing
Experimental result it is authentic and valid.
In use, each fluid injection pipeline 7 is connect with the pump injection system of large scale true triaxial experimental provision.By controlling pump note
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 set, can obtain the crack propagation law during horizontal well fracturing and a plurality of is split
Situation is interfered with each other between seam, to provide theoretical direction for the optimization of live staged fracturing arrangement and method for construction.
The present invention provides a kind of pit shaft, and multiple liquid outlets are arranged at intervals on pit shaft；Each liquid outlet and a liquid injection pipe
Line connects, and by being stretched out in pit shaft, fluid injection pipeline is used to fracturing fluid exporting liquid outlet fluid injection pipeline；One liquid outlet is outside pit shaft
The axial both sides of side are each provided with a sealing ring, and sealing ring is used to pass through a liquid outlet in sealing ring and multiple liquid outlets
Other liquid outlets separate.Pit shaft provided by the invention is by using a plurality of fluid injection pipeline and the separately positioned realization of multiple liquid injection ports
The separation fluid injections of different fracturing sections contributes to accurate level of understanding well segmentation pressure by horizontal well fracturing simulated experiment
Interfering with each other between the crack propagation law and many cracks during splitting, for the optimization of live staged fracturing arrangement and method for construction
Provide theoretical direction.Shaft structure is simple simultaneously, easy to process, and can reuse, and has saved cost, has simplified experiment
Operation, improves efficiency.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (4)
1. a kind of horizontal well fracturing experimental method, which is characterized in that including：
The blind hole of predetermined depth is drilled out on rock sample；
The casing of sealed bottom is fixed in the blind hole, and cuts out multiple annular grooves in described sleeve pipe；Wherein, each
The diameter of annular groove is more than the diameter of blind hole；
Pit shaft is placed in described sleeve pipe；The pit shaft includes multiple liquid outlets, wherein each liquid outlet and an annular groove
Relatively；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 connect with a fluid injection pipeline；
Each fluid injection pipeline is connect with pump injection system, and three-dimensional stress is applied to the rock sample；
Fracturing fluid is injected to the fluid injection pipeline by the pump injection system；
Wherein, described sleeve pipe is polyethylene material；Each liquid outlet is connected with one fluid injection pipeline by welding manner
It connects, each fluid injection pipeline in the pit shaft by stretching out；
It is described that the casing of sealed bottom is fixed in the blind hole, and multiple annular grooves are cut out in described sleeve pipe, including：
Described sleeve pipe is placed in the blind hole, glue is injected into the gap between described sleeve pipe and the blind hole, waits for glue
The multiple annular groove is cut out after consolidation in described sleeve pipe.
2. according to the method described in claim 1, it is characterized in that, the glue is epoxy resin AB glue.
3. according to the method described in claim 1, it is characterized in that, the pit shaft and the matching size of described sleeve pipe close.
4. a kind of pit shaft, which is characterized in that be arranged at intervals with multiple liquid outlets on the pit shaft；
Each liquid outlet is connect with a fluid injection pipeline by welding manner, and the fluid injection pipeline in the pit shaft by stretching out；Institute
Fluid injection pipeline is stated for injecting fracturing fluid；
Each liquid outlet is respectively arranged with sealing ring along the axial both sides of the pit shaft；
The pit shaft is absolute construction；
For being placed in casing, described sleeve pipe is fixed on by glue in the blind hole of rock sample the pit shaft, setting in described sleeve pipe
There are multiple annular grooves, wherein each annular groove is opposite with a liquid outlet；Described sleeve pipe is polyethylene material
Matter.
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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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710114967.6A CN106869890B (en) | 2017-02-28 | 2017-02-28 | Horizontal well fracturing experimental method and pit shaft |
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| CN106869890B true CN106869890B (en) | 2018-08-07 |
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| CN113944452B (en) * | 2021-10-13 | 2022-12-13 | 中国科学院武汉岩土力学研究所 | Hydraulic fracturing sleeve fracture research method |
| CN115929272A (en) * | 2022-12-28 | 2023-04-07 | 中国石油大学(北京) | Horizontal well staged clustering fracturing experimental device and method |
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| CN106401551A (en) * | 2016-10-21 | 2017-02-15 | 中国石油大学(北京) | Simulation experiment system for staged fracturing or simultaneous fracturing of horizontal wells |
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| CN104373105A (en) * | 2013-08-14 | 2015-02-25 | 中国石油大学(北京) | Shaft-simulating multifunctional flowing test system |
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| CN104563993A (en) * | 2013-10-11 | 2015-04-29 | 中国石油大学(北京) | Staged fracturing or synchronous fracturing simulation experiment method for shale horizontal well |
| CN104481487A (en) * | 2014-11-12 | 2015-04-01 | 中国石油化工股份有限公司 | Multi-stage, multi-gap and multi-section fracturing method for horizontal well |
| CN105675399A (en) * | 2016-01-15 | 2016-06-15 | 中国石油大学(北京) | Laboratory staged hydraulic fracturing test method for large-size natural rock |
| CN106401551A (en) * | 2016-10-21 | 2017-02-15 | 中国石油大学(北京) | Simulation experiment system for staged fracturing or simultaneous fracturing of horizontal wells |
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