CN107796694A - A kind of high temperature triaxial core hydraulic fracture clamper and its application method - Google Patents
A kind of high temperature triaxial core hydraulic fracture clamper and its application method Download PDFInfo
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- CN107796694A CN107796694A CN201710893800.4A CN201710893800A CN107796694A CN 107796694 A CN107796694 A CN 107796694A CN 201710893800 A CN201710893800 A CN 201710893800A CN 107796694 A CN107796694 A CN 107796694A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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Abstract
The invention provides a kind of high temperature triaxial core hydraulic fracture clamper and its application method, including cylinder part, high temperature gum cover, monitoring assembly, heating mantle and fracturing joint.There is a blind hole to be coordinated with fracturing joint on the left plug end face of cylinder, right plug can move axially in cylinder interior edge cylinder, left and right plug has an aperture to be through to other end from a certain end face center, by being coordinated the closed rock core chamber to be formed to bear the effect of outside triaxial stress and hot conditions simultaneously with high-temp glue set；External fluid enters from left plug central small hole vertically；Six temperature monitoring interfaces are distributed with cylinder vertically；The adding thermal resistance indirectly heat rock core being applied through in heating mantle of temperature.The present invention is simple for structure, easy to operate, can solve the problems, such as current clamper applying in the presence of hot dry rock laboratory test temperature is not high, be difficult to apply triaxial stress temperature action simultaneously, experimental enviroment sealing is poor, material lifetime is shorter.
Description
Technical field
Patent of the present invention is related to core test equipment, especially a kind of high temperature triaxial core hydraulic fracture clamper and its makes
Use method.
Background technology
Increasingly mature with China's subterranean resource production technique, the hot dry rock that ground end stores most thermals source is considered as
The exploitation improved for hot dry rock of the important component of following china natural resources structure, correlation theory and practice is most important.
The basis of laboratory test not only theoretical research, also provides effective simulated scenario for produced on-site.Wherein, core holding unit is made
For one of the most frequently used infrastructure device of geology rock core correlation test, its performance decides the type and condition that can carry out experiment.
The ground end rock mass that broadly temperature is in 150-650 degree is referred to as hot dry rock, and just most economic development at present
The temperature of benefit should be 200-300 degree or so.Hydraulic fracture is the important technical of current hot dry rock exploitation, and in laboratory
Under the conditions of, for the local environment of accurate dry-hot simulation rock, in addition to triaxial stress, the i.e. temperature of main factor should reach dry at present
The major temperature scope of hot rock exploitation.But at present, most core holding units are only capable of acting on to rock core application triaxial stress, and part
High temperature clamper is then only capable of providing the hot environment that maximum temperature is 180 degree, and most high temperature clampers are not used to carry out rock
The Hydraulic Fracturing Tests of the heart.Current instrument still can not fully simulate the occurrence condition of actual hot dry rock, it follows that conclusion
Still it is dfficult to apply in practice.
Current most clampers are caused to be difficult to the master that the rock core hydraulic fracture under triaxial stress and hot conditions is tested
The reason is wanted to be：(1) mode for wrapping up rock core is difficult to bear the effect of triaxial stress and high temperature simultaneously and realizes rock core hydraulic fracture.
Most high temperature clampers wrap up rock core frequently with red copper set, and be on the one hand the shortcomings that the method red copper set rigidity it is larger,
The ability of recovery deformation is poor, occurs not being continuing with if larger deformation if it.And for hydraulic fracture experiment,
The red copper set that local sillar avalanche makes injection waterpower directly impact parcel rock core easily occurs for the moment that rock sample destroys, and causes original
Uniformly the red copper of parcel rock core, which is enclosed under the impact of external stress and internal waterpower, easily occurs certain deformation, with test number (TN)
Increase easily make red copper set failure；On the other hand then it is under the hot conditions more than 200 degree that caused thermal stress causes
The problem of above-mentioned, is further magnified；(2) rock core chamber sealing is poor.On the one hand for cylinder sample rock core not up to standard using purple
Copper sheathing parcel easily leaves a void locally, is difficult to ensure that sealing；On the other hand then it is that the sealing of fracturing junction portion is past
Sealed toward after O-ring closure by the way of filling with sealant, but O-ring was difficult to ensure that except life-span in high temperature environments
Outside, its bond effect between fluid sealant is also difficult to meet to require, is easily revealed when the hydraulic pressure of injection is more than confined pressure,
Cause test failure.If adding external high temperature condition, the difficulty of sealing will be caused because of reasons such as encapsulant heat resistance deficiencies
Further increase.
To sum up, clamper is primarily present in the application of hot dry rock laboratory test and can apply that environment temperature is not high, is difficult at present
Apply the problem of triaxial stress-temperature action, hydraulic fracture experimental enviroment sealing are poor, the component materials life-span is shorter simultaneously.Cause
This, is in view of above-mentioned difficulties, the practical application based on laboratory test experience and core holding unit herein, there is provided a kind of three new axles should
Rock core hydraulic fracture clamper under power and hot conditions, in the condition for meeting triaxial stress and high temperature needed for hot dry rock simulation
While ensure the sealing of its internal rock core parcel, and smoothly complete triaxial stress and height under the monitoring of outside monitoring component
The experiment of rock core hydraulic fracture and guarantee lapping under the conditions of temperature do not occur to destroy and shorten its service life.
The content of the invention
It is an object of the invention to provide a kind of high temperature triaxial core hydraulic fracture clamper and its application method, it is intended to solves
What clamper was primarily present in the application of hot dry rock laboratory test at present apply, and temperature is not high, be difficult to apply simultaneously three axles should
The problem of power-temperature action, hydraulic fracture experimental enviroment sealing are poor, the component materials life-span is shorter.
To reach above-mentioned purpose, the present invention is to provide a kind of high temperature triaxial core hydraulic fracture clamper, including cylinder
Part, high temperature gum cover, monitoring assembly, heating mantle and fracturing joint.
Including cylinder part, high temperature gum cover, monitoring assembly, heating mantle and fracturing joint；Described clamper cylinder part
Including left plug and right plug, left plug is made up of two parts, and Part I is the column with bolt connecting hole, column
Stepped cylindrical groove that an external diameter progressively diminishes inwardly is cut from one of them horizontal end face center and is through to another level
End face；The Part II of left plug is ladder circle column piece, the cylinder of ladder circle column piece exterior contour and the Part I of left plug
The stepped cylindrical groove in-profile of part is identical；The Part II of left plug is the Part I that ladder circle column piece passes through left plug
Stepped cylindrical groove and the column of column are coordinated.
The right plug of clamper cylinder part is made up of two parts, and Part I is ladder circle column piece, described ladder circle
Column piece inwardly cuts off out a cylinder groove from horizontal end face center in the less one end of external diameter, is inwardly bored in the bottom of cylinder groove
One is less than the screwed hole of cylinder groove internal diameter；The Part II of right plug is a cylindrical rod, and one end of cylindrical rod is threaded,
And the cylinder groove and cylinder of the exterior contour of one end of described screwed cylindrical rod and Part I ladder circle column piece
The in-profile of bottom land end screwed hole is identical；The Part II of right plug be cylindrical rod screwed one end with first
The screwed hole of cylinder trench bottom on the horizontal end face for the stepped cylindrical external diameter small end divided is coordinated by screw thread；Left plug
Largest outside diameter horizontal end face center at be provided with the internal diameter blind hole equal with fracturing connector outer diameter small end external diameter,
Blind hole is used for being coordinated with fracturing joint；It is another that described left plug has a circular hole to be through to from certain level end face center
Horizontal end face；Described right plug has a circular hole to be through to another horizontal end face from certain level end face center.
Described right plug can move in cylinder along the axial direction of cylinder, and left plug and right plug pass through taper respectively
Ring and high-temp glue set, which cooperatively form, closed bears outside triaxial stress and the rock core crushing test chamber of hot conditions；Institute
The internal radius at the minimum outer diameter end for the conical ring stated is identical with plug external diameter；Left plug and right plug from the external diameter of conical ring most
Big end is in contact through the smallest end of conical ring with rock core；The minimum outer diameter end of conical ring, which is squeezed into, forms entirety in high temperature gum cover.
Described fracturing joint is a ladder column, has a circular hole to be through to another water from certain level end face center
Planar end surface, the described bore inner diameter at two end face centers is with left plug in the circular hole at two end face centers
Footpath is equal；The external diameter of described less one end of ladder circle column piece external diameter and the center of the horizontal end face of the largest outside diameter of left plug
The internal diameter for locating the blind hole of setting is equal；Through cutting shape in the axial direction outside the larger one end of the external diameter of described ladder circle column piece
Spirality groove.
Rock core hydraulic fracture under rock core hydraulic fracturing clamper can carry out triaxial stress and hot conditions while act on tries
Test, triaxial stress maximum is respectively：Axle pressure is 25MPa, and confined pressure 20MPa, hot conditions are up to 300 degree.
Clamper cylinder part, fracturing interface and the heating mantle of a kind of described high temperature triaxial core hydraulic fracture clamper
Material is the high pressure resistant high-temperature materials of 316L, and critical pressure and temperature are respectively 60MPa and 350 DEG C；Described high temperature gum cover material
Expect that for high temperature resistant perfluoroelastomers, critical pressure and temperature are respectively 30MPa and 350 DEG C.
The cooperation side of a kind of fracturing joint of described high temperature triaxial core hydraulic fracture clamper and left plug and rock core
Formula is：Less one end of external diameter that fracturing joint is ladder circle column piece is inserted in the blind hole of left plug, the larger one end of external diameter
An internal diameter is previously provided with insertion rock core end face center to be not less than in the blind hole of ladder circle column piece maximum outside diameter, and passes through resistance to height
Warm inorganic glue is bonded.
A kind of hydraulic fracture test method of described high temperature triaxial core hydraulic fracture clamper at high temperature under high pressure, its
Specific experiment process is as follows：(1) sample of experiment is prepared first.Test specimen used is diameter 50mm, length 100mm
Cylinder rock core, an a diameter of 8- is inwardly bored along axis from center from its certain level end face after being polished to the both ends of rock core
10mm, the blind hole that length is 40-50mm.(2) secondly, fracturing joint is fixed on blind hole by specimen sample using high temperature inorganic glue
It is interior and coordinate described left plug and right plug and conical ring at high temperature gum cover both ends, recycle bolt pressing from both sides plug part
It is fixed on holder cylinder.Then mounted cylinder is assembled with heating mantle and muff.By each temp probe according to
It is secondary that to stretch into temperature monitoring intraoral.(3) secondly, the application of confined pressure and axle pressure is carried out using constant-flux pump, will after pressure reaches requirement
Axle presses process interface and confined pressure interface to close.Then the adding thermal resistance in heating mantle is heated by external power source, indirectly
Conduct to the rock core in cylinder.The size that confined pressure and axle pressure are constantly finely tuned by external pressure emptying device in heating process is protected
Confirmatory test precision.Keeping warm mode is arranged to after temperature reaches necessary requirement.(4) finally, when outside, application environmental activity is steady
After fixed, hydraulic pressure is injected into rock core blind hole by the circular hole through two horizontal end face centers of left plug using constant-flux pump.It is logical
Cross the situation of change of the pressure and temperature of external meters and computer equipment observation injection fluid.Mean to test when hydraulic pressure bust
Complete.Hereafter injection pressure is gradually reduced to zero, then lays down confined pressure, finally lay down axle pressure.Again by rock after temperature is naturally tired but
Sample takes out.
Compared with prior art, the invention has the characteristics that and advantage：
1st, it is that rock core chamber has high leakproofness to test occasion.Rock core hydraulic fracture experiment under triaxial stress-hot conditions
It is required that the place that experiment occurs is that rock core chamber need to possess high leakproofness, and the structure for being combined into rock core chamber needs to bear to a certain degree
Deformation terminated later from the impact of fracturing waterpower and the effect of external stress with Resistance Test.Compared to conventional high temperature clamper
Red copper set used, perfluoroelastomers material is in addition to higher temperature is resistant to, and the also characteristic with preferable deformation resistant can be more preferable
Ground is bonded the exterior contour of rock core, avoids because the space between gum cover and rock core causes external stress to be uniformly applied to rock core
On, while the lower moderate finite deformation of hydraulic action internally and external stress effect after off-test can be also born, ensure to use the longevity
Life.
But perfluoroelastomers material need to undergo prolonged sulfurization in processing, cause it to be presented under normal temperature state
Go out harder state, but the outlet of its both ends be in not necessarily perfectly round after processing, thus how to ensure its in end and
Sealing between outside plug and internal rock core then becomes the problem of new.Based under perfluoroelastomers material normal temperature it is harder but
The characteristics of certain deformation can be born, taper ring high-temp glue is covered into interior extruding, using the less one end of conical ring external diameter as rock core
With the outlet of plug, conical ring can ensure that its precision can ensure that the internal diameter of its small end and plug are carried out well after finishing
Coordinate.And the use of its later stage is not interfered with yet in the extruded high temperature gum cover in both ends, and squeezing action is equivalent in advance in gum cover
Certain tension is inside applied with, this tension can make it produce the trend shunk so as to preferably be fitted on conical ring.
In addition, the purpose that left plug is divided into two parts is, go to bear axle using the ladder circle column piece of Part II
The effect of pressure is advantageous to seal without making the larger displacement of overall generation；Similarly, application part of the right plug as axle pressure,
Rigidity is higher and weight is larger, is classified as two parts and predominantly ensures that the flatness of end face that is contacted with rock core is close to improve
Envelope, and Part II then it is independently detachable be advantageous to mitigate structure weight.
And a kind of new hydraulic fracture joint proposed by the invention, quality present in traditional seal with O ring can be avoided
The problems such as control is difficult, service life hardly possible determines, the main part using in joint insertion rock core blind hole use helix to it
The mode that surface carries out cutting process goes to increase the adhesion strength between joint and binding agent, can be more effectively compared to conventional method
Play the effect of binding agent and processing method is easy and effective.Therefore, the consideration based on sealing and based on material therefor, it is right
The structure of rock core chamber is as above reasonably designed so as to realize that the rock core hydraulic fracture under triaxial stress-hot conditions is tested.
2nd, the present invention can apply up to 300 degree of high temperature while triaxial stress applies, based on used rubber
The material such as material and cylinder, connector, it is ensured that the long-term heat resistance energy of device, while based on structure set forth above,
The temperature of rock core during experiment and cylinder is monitored in real time using external monitoring control, is more beneficial for entering experiment process
The problem of in row analysis and timely discovery procedure.
Brief description of the drawings
Accompanying drawing described here is only used for task of explanation, and is not intended in any way to limit model disclosed by the invention
Enclose.In addition, shape and proportional sizes of each part in figure etc. are only schematical, the understanding of the present invention is used to help, and
It is not the specific shape and proportional sizes for limiting each part of the present invention.Those skilled in the art under the teachings of the present invention, can
To select various possible shapes and proportional sizes to implement the present invention as the case may be.
Fig. 1 is the cross-sectional view of triaxial stress of the present invention rock core hydraulic fracture clamper with a temperature of；
Fig. 2 is the structural representation of the pressure break joint of the present invention；
Fig. 3 is the structural representation of the heating mantle of the present invention；
Fig. 4 is the structural representation of the left plug part of the present invention；
Fig. 5 is the structural representation of the right plug part of the present invention.
Description of reference numerals：
1- adjusting nuts；2- fastening bolts；The left conical rings of 3-；The left plugs of 4-；5-1 rock core thermometric interfaces；6-2 rock cores
Thermometric interface；7-3 rock core thermometric interfaces；8- rock cores；The right plugs of 9-；10- high temperature gum covers；The axle pistons of 11- tri-；12- right pistons
Cavity；The right briquettings of 13-；14- axles press process interface；15- axles press backhaul interface；The right conical rings of 16-；17- cylinders；18- cylinder controls
Warm interface；19- confined pressure interfaces；20-4 rock core thermometric interfaces；21- fracturing joints；22- heating mantles；23- muffs；24- is incubated
Layer；25- end caps；26- high temperature resistant O-rings；27- adding thermal resistances.
Embodiment
With reference to the description of accompanying drawing and the specific embodiment of the invention, details of the invention can be clearly understood.But
It is the embodiment of invention described herein, is only used for explaining the purpose of the present invention, and can not understands in any way
Into being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that any possible change based on the present invention
Shape, these are regarded as belonging to the scope of the present invention.
1st, high temperature triaxial core hydraulic fracture holder structure
With reference to the cross-sectional view that figure 1 is triaxial stress of the present invention rock core hydraulic fracture clamper with a temperature of.Such as
Shown in Fig. 1, clamp body includes 4, No. 1 adjusting nut 1, fastening bolt 2, left conical ring 3, left plug rocks in this embodiment
Heart thermometric interface 5,2 rock core thermometric interface 6,3 rock core thermometric interface 7, No. 4 rock core thermometric interfaces 20, right plug 9, high temperature
Gum cover 10, three axle pistons 11, right briquetting 13, axle pressure process interface 14, axle pressure backhaul interface 15, right taper ring 16, clamper cylinder
Body 17, cylinder temperature control interface 18, confined pressure interface 19, fracturing joint 21, heating mantle 22, muff 23 and end cap 25.Tested rock
The heart 8 a diameter of 50mm, length 100mm, there is that a diameter is equal with fracturing connector outer diameter, depth 40- from left part along axle center
50mm blind hole.
Fig. 2 is the structural representation of fracturing joint 21.The less one end of the diameter of fracturing joint 21 is provided with twice high temperature resistant O
For shape circle 26 to carry out location fit with left plug 4, the one end being relatively large in diameter is then to stretch into rock core blind hole the part bonded,
And cutting is carried out to its surface using helix from shaft end and forms spiral groove to increase the cohesive force between binding agent.
Fig. 3 and Fig. 4 is respectively the structural representation of left plug 4 and right plug 9.Left plug 4 is designed as two respective outer side edges and formed, mainly
To ensure the sealing of rock core chamber while rock core is not influenceed in mobile on axis, while it is the sealing of enhancing structure itself
Property, one end that left plug 4 is inserted in fracturing joint 21 is coordinated using twice high temperature resistant O-ring 26.And right plug is then main
To ensure the sealing of rock core chamber and reducing weight, convenient handling.
The axis of fracturing joint 21, left plug 4 and right plug 9 the installation positioning latter three in the cylinder 17 is identical and respective edge
Axis is also identical through the aperture of structure.Respective one end of wherein left plug 4 and right plug 9 is positioned and fixed by bolt respectively
Left conical ring 3 and right taper are utilized respectively on clamper cylinder 17, while in left plug 4 and the right 9 respective other end of plug
After ring 16 is squeezed into high temperature gum cover 8, left plug 4 is each passed through left conical ring 3 and right conical ring 16 with right plug 9 and propped up
The both ends of rock core.Left conical ring 3 and right conical ring 16 are provided with O-ring to ensure the sealing between conical ring and cylinder 17.Due to
Left plug 4 has been fixed with right plug 9 with cylinder 17, therefore closed rock core chamber is being formd in high temperature gum cover 8.
Triaxial stress is pressurizeed by constant-flux pump.Axle pressure is applied for mechanism, is pressed into by the way that liquid is pumped into axle
Right plug part 9 is promoted in journey interface 14, and the direction of plug part 4 carries out relative movement and acted directly on rock core end face to the left, when
Axle pressure process interface 14 is closed after axle pressure needed for reaching.Then backhaul interface 15 is pressed to lead liquid by axle when axle pressure need to unload
Go out.After the axle pressure needed for reach, it can be realized using three axle pistons 11 and axle press pump source is switched into confined pressure pumping source, by by liquid pump
It is shortlisted for crimp and is acted directly in mouth 19 on high temperature gum cover 8, deforms upon high temperature gum cover 8 and inwardly extrude rock core to apply ring
Acted on to confined pressure.
Fig. 5 is the structural representation of heating mantle 22.The internal diameter of heating mantle 22 is identical with the external diameter of cylinder 17.Heating mantle 22 is with protecting
Laying asbestos layer avoids improving experiment safety coefficient between the gap of temperature set 24.Adding thermal resistance 27 is entered by external power source during heating
Row heating, is passed to the high temperature gum cover 8 that heat is passed in cylinder by heat transfer, and then rock core is heated.
Four rock core thermometric interfaces 5,6,7,20 are provided with cylinder 17 altogether, outside temperature probe is directly protruding into cylinder 17
Contacted, the temperature change in four regions of rock core during experiment can be monitored with the surface of high temperature gum cover 8.It is simultaneously
Ensure the accuracy of test temperature and the security of experiment process, temperature control interface 18 is provided with cylinder to facilitate temperature probe
Monitor the temperature of cylinder 17.After test requirements document temperature and stabilization is reached two between rock core thermometric interface 5,6,7,20 and heating mantle 22
Temperature measured by person should be unanimous on the whole, and the unqualified or instrument of sealing can be explained if differing larger and break down, be advantageous to and
When solve.
Pipe valve, cylinder 17, fracturing interface 21 and the material of heating mantle 22 are the high pressure resistant high-temperature materials of 316L in instrument, are faced
Boundary's pressure and temperature is respectively 60MPa and 350 DEG C；The gum cover of internal package rock core and the O-ring material of inside configuration are complete
Fluoroether rubber, critical pressure and temperature are respectively 30MPa and 350 DEG C.Above material can make experiment in triaxial pressure and temperature most
Big value is respectively to complete the examination of rock core hydraulic fracture with security and stability under conditions of axle presses 300 degree of 25MPa, confined pressure 20MPa and temperature
Test.
2nd, process is tested：
The specific implementation step of the present embodiment is as follows：
(1) sample of experiment is prepared first.Test specimen rock core 8 used is diameter 50mm, length 100mm cylinder
Body rock core, an a diameter of 8- is inwardly bored along axis from center from its certain level end face after being polished to the both ends of rock core
10mm, the blind hole that length is 40-50mm.
(2) secondly, fracturing joint 21 is fixed in blind hole and by described in by specimen sample rock core 8 using high temperature inorganic glue
Left plug 4 and right plug 9 and left conical ring 3 and right conical ring 16 coordinate at the both ends of high temperature gum cover 10, recycle bolt by a left side
Plug 4 and right plug 9 are fixed on clamper cylinder 17.Then by mounted part and heating mantle 22 and heat-insulation layer 24
Assembled.It is intraoral that each temp probe is stretched into temperature monitoring successively.
(3) again, the application of confined pressure and axle pressure is carried out using constant-flux pump, after pressure reaches requirement, axle is pressed into journey and connect
Mouth 14 and confined pressure interface 19 are closed.Then the adding thermal resistance 27 in heating mantle 22 is heated by external power source, passed indirectly
The rock core 8 being directed in cylinder.The stream that medium is pressed as ring pressure and axle that will make to be pumped into because of the change of the temperature in heating process
Body produces the change such as thermal expansion so that confined pressure and axle the pressure increase applied.For this problem, pass through external pressure emptying device
The constantly preferable guarantee test precision of big I of fine setting confined pressure and axle pressure.It is arranged to be incubated shape after temperature reaches necessary requirement
State.
(4) finally, after outside applies environmental activity stabilization, two levels are run through by left plug 4 using constant-flux pump
The circular hole of end face center injects hydraulic pressure into the blind hole of rock core 8.Pass through external meters and the pressure of computer equipment observation injection fluid
The situation of change of power and temperature.Mean that experiment is completed when hydraulic pressure bust.Rock sample is taken out again after temperature is naturally tired but.
The present invention can carry out the pressure that hydraulic fracture of the rock core under high-temperature and high-pressure conditions is tested and fluid is injected in monitoring in real time
The temperature of power and temperature, rock core each point vertically, success of the test rate is guaranteed, error in dipping is small.Structure based on the present invention
And the mode of action, the reservoir fracture Initiation And Propagation mechanism that the present invention can be used in research the injecting process, and effectively disclose rock core and cause
Fracture water flow during splitting, theoretical and experimental basis is provided for hot dry rock reservoir micromechanism of damage in actual production.
The schematical embodiment of the present invention is the foregoing is only, is not limited to the scope of the present invention.This hair
Bright each part can be mutually combined under conditions of not conflicting, and any those skilled in the art, not depart from this hair
The equivalent variations made on the premise of bright design and principle and modification, the scope of protection of the invention all should be belonged to.
Claims (4)
- A kind of 1. high temperature triaxial core hydraulic fracture clamper, it is characterised in that：Including cylinder part, high temperature gum cover, monitoring group Part, heating mantle and fracturing joint；Described clamper cylinder part includes left plug and right plug, and left plug is by two parts group Into Part I is the column with bolt connecting hole, and column inwardly cuts one from one of them horizontal end face center Stepped cylindrical groove that individual external diameter progressively diminishes simultaneously is through to another horizontal end face；The Part II of left plug is ladder circle column piece, Ladder circle column piece exterior contour is identical with the stepped cylindrical groove in-profile of the column of the Part I of left plug；Left plug Part II is that ladder circle column piece is coordinated through the stepped cylindrical groove of the column of the Part I of left plug with column；The right plug of clamper cylinder part is made up of two parts, and Part I is ladder circle column piece, described ladder circle column piece A cylinder groove is inwardly cut off out from horizontal end face center in the less one end of external diameter, it is small inwardly to bore one in the bottom of cylinder groove In the screwed hole of cylinder groove internal diameter；The Part II of right plug is a cylindrical rod, and one end of cylindrical rod is threaded, and institute The exterior contour of the one end for the screwed cylindrical rod stated and the cylinder groove of Part I ladder circle column piece and cylinder groove bottom Hold the in-profile of screwed hole identical；The Part II of right plug is screwed one end and the Part I of cylindrical rod The screwed hole of cylinder trench bottom on the horizontal end face of stepped cylindrical external diameter small end is coordinated by screw thread；Outside left plug The internal diameter blind hole equal with fracturing connector outer diameter small end external diameter, blind hole are provided with the center of the maximum horizontal end face in footpath For being coordinated with fracturing joint；Described left plug has a circular hole to be through to another level from certain level end face center End face；Described right plug has a circular hole to be through to another horizontal end face from certain level end face center；Described right plug can move in cylinder along the axial direction of cylinder, left plug and right plug respectively by conical ring with High-temp glue set, which cooperatively form, closed bears outside triaxial stress and the rock core crushing test chamber of hot conditions；Described The internal radius at the minimum outer diameter end of conical ring is identical with plug external diameter；Left plug and right plug are from the largest outside diameter end of conical ring Smallest end through conical ring is in contact with rock core；The minimum outer diameter end of conical ring, which is squeezed into, forms entirety in high temperature gum cover；Described fracturing joint is a ladder column, has a circular hole to be through to another horizontal ends from certain level end face center Face, the bore inner diameter phase at two end face centers of the described bore inner diameter and left plug at two end face centers Deng；The described external diameter of the less one end of ladder circle column piece external diameter at the center of the horizontal end face of the largest outside diameter of left plug with setting The internal diameter for the blind hole put is equal；Spiral shell is formed in the axial direction through cutting outside the larger one end of the external diameter of described ladder circle column piece Revolve connected in star；Rock core hydraulic fracture under rock core hydraulic fracturing clamper can carry out triaxial stress and hot conditions while act on is tested, and three Axial stress maximum is respectively：Axle pressure is 25MPa, and confined pressure 20MPa, hot conditions are up to 300 degree.
- 2. high temperature triaxial core hydraulic fracture clamper as claimed in claim 1, it is characterised in that：Described clamper cylinder Part, fracturing interface and heating cover material are the high pressure resistant high-temperature materials of 316L, critical pressure and temperature be respectively 60MPa and 350℃；Described high-temp glue cover material is high temperature resistant perfluoroelastomers, and critical pressure and temperature are respectively 30MPa and 350 DEG C.
- A kind of 3. high temperature triaxial core hydraulic fracture clamper as claimed in claim 1, it is characterised in that：Described fracturing connects Head and the fit system of left plug and rock core are：Left plug is inserted into less one end of external diameter that fracturing joint is ladder circle column piece Blind hole in, it is maximum not less than ladder circle column piece to be previously provided with an internal diameter at the larger one end insertion rock core end face center of external diameter In the blind hole of external diameter, and bonded by refractory inorganic adhesive.
- A kind of 4. hydraulic fracture examination of high temperature triaxial core hydraulic fracture clamper as claimed in claim 1 at high temperature under high pressure Test application method, it is characterised in that：(1) sample of experiment is prepared first：Test specimen used is diameter 50mm, length 100mm cylinder rock core, right An a diameter of 8-10mm from its certain level end face along axis from center is inwardly bored in the both ends of rock core after being polished, length is 40-50mm blind hole；(2) secondly, fracturing joint is fixed in blind hole and by described in by specimen sample using high temperature inorganic glue Left plug, right plug and conical ring coordinate at high temperature gum cover both ends, recycle bolt by plug part on clamper cylinder It is fixed；Then mounted cylinder is assembled with heating mantle and muff, each temp probe is stretched into temperature successively Monitor intraoral；(3) secondly, the application of confined pressure and axle pressure is carried out using constant-flux pump, after pressure reaches requirement, axle is pressed into journey and connect Mouth and confined pressure interface are closed, and then the adding thermal resistance in heating mantle is heated by external power source, indirectly conduction to cylinder Interior rock core, the size guarantee test essence of confined pressure and axle pressure is constantly finely tuned by external pressure emptying device in heating process Degree, keeping warm mode is arranged to after temperature reaches necessary requirement；(4) finally, after outside applies environmental activity stabilization, utilize Constant-flux pump injects hydraulic pressure by the circular hole through two horizontal end face centers of left plug into rock core blind hole, passes through external meters And the situation of change of the pressure and temperature of computer equipment observation injection fluid, mean that experiment is completed when hydraulic pressure bust, hereafter Injection pressure is gradually reduced to zero, then confined pressure is laid down, finally lays down axle pressure, after temperature tire out naturally but afterwards rock sample taken out.
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| CN201710893800.4A CN107796694A (en) | 2017-09-27 | 2017-09-27 | A kind of high temperature triaxial core hydraulic fracture clamper and its application method |
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| CN109357953A (en) * | 2018-11-23 | 2019-02-19 | 吉林大学 | A kind of rock core test device tested for three axis of high temperature and pressure and hydraulic fracturing |
| CN109709214A (en) * | 2018-11-14 | 2019-05-03 | 中国石油天然气股份有限公司 | Dynamic crack measuring device in shale in-situ conversion process |
| CN109870349A (en) * | 2019-03-29 | 2019-06-11 | 中国矿业大学 | A kind of high temperature and pressure hydraulic pressure fracturing clamper and its test method |
| CN111220478A (en) * | 2020-01-20 | 2020-06-02 | 中南大学 | High-temperature high-pressure supercritical carbon dioxide rock core cracking test device |
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| CN112858022A (en) * | 2021-01-19 | 2021-05-28 | 中南大学 | Device and method for measuring fracture toughness of high-temperature rock by using hydraulic fracturing method |
| CN114923768A (en) * | 2022-05-19 | 2022-08-19 | 西南石油大学 | Nondestructive dismounting type high-temperature high-pressure rock core holder device |
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Application publication date: 20180313 |