CN105628507B - The device of realization hydraulic fracturing experiments and rock sample and method in conventional rock mechanics experiment machine - Google Patents

The device of realization hydraulic fracturing experiments and rock sample and method in conventional rock mechanics experiment machine Download PDF

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Publication number
CN105628507B
CN105628507B CN201610084533.1A CN201610084533A CN105628507B CN 105628507 B CN105628507 B CN 105628507B CN 201610084533 A CN201610084533 A CN 201610084533A CN 105628507 B CN105628507 B CN 105628507B
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head
pressure
rock
rock sample
sample
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CN201610084533.1A
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CN105628507A (en
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何柏
谢凌志
李凤霞
张汝生
贺甲元
任利
艾婷
王俊
孙亚泽
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四川大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q

Abstract

Provided by the present invention for carrying out the device of hydraulic fracturing experiments in conventional rock mechanics experiment machine, including the seaming chuck push-down head that is arranged on triaxial chamber chassis and axial compression bar effect thereon, seaming chuck and push-down head are designed with pressure flow road, characterized by further comprising being nested with pressure water to be prevented to be mixed into the anti-of the oil of confining pressure in triaxial chamber outside rock sample let out set and infiltration plate, the anti-upper and lower ends for letting out set are fixed on seaming chuck and push-down head;Pressure water seepage flow hole is distributed on the infiltration plate, is arranged on pressure water and goes out to flow between the rock sample at end and pressure head;One of seaming chuck and push-down head are composite structure pressure head, are made of the effect pressure head and transfer head for acting on rock sample, and effect pressure head is coupled with transfer head by convex-concave intercalation structure.The present invention also provides the rock sample suitable for above device and based on above device in the method that hydraulic fracturing experiments are realized in conventional rock mechanics experiment machine, hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine to realize.

Description

The device of hydraulic fracturing experiments and rock examination are realized in conventional rock mechanics experiment machine Sample and method

Technical field

The invention belongs to hydraulic fracturing laboratory experiment fields, and in particular to waterpower is realized in conventional rock mechanics experiment machine The device and rock sample and method of fracturing experiments.

Background technology

Natural gas occupies highly important status as a kind of high-quality and efficient clean energy resource in China's energy resource structure, But in a short time, conventional gas producing capacity in China's can not match with the demand of rapid growth, unconventional natural there is an urgent need for increasing The exploration and development of gas.And unconventional gas reservoir has the characteristics that " low hole, hypotonic " more, therefore Unconventional gas exploitation One of core technology is the pressure break anatonosis of reservoir, and hydraulic fracturing technology is skill the most ripe in current reservoir fracturing improvement Art means.

Rarely has the report seen and hydraulic fracturing laboratory experiment is smoothly completed based on conventional rock mechanics experiment machine at present.Normal Directly carry out hydraulic fracturing experiments in rule rock mechanics experiment machine (common triaxial tests system) rock sample need to be directly bonded On testing machine infiltration pressure head, when carrying out hydraulic fracturing to rock sample, since required Fluid pressure is had to be larger than suffered by sample Minimum principal stress (σ 3), i.e., the hydraulic pressure pressure suffered by sample let out set (oil removal higher than confining pressure so as to cause package the anti-of sample Film) it is detached from sample, hydraulic pressure water and confining pressure oil, which mix, leads to the failure of an experiment, in some instances it may even be possible to cause equipment damage etc..Cause This current hydraulic fracturing laboratory experiment is generally completed in true triaxial experimental system, and Specimen Shape used is parallelepiped.So And the core that underground is taken out is cylindrical specimens, be processed into during hexahedron test specimen need it is a series of numerous by cutting, polishing etc. Trivial process causes rock unnecessary damage, and machines rear specimen size and can also reduce.Also, true triaxial is tested The depth of parallelism in each face and verticality requirement are very high to test specimen for system, and processing rock sample is still appeared either using core all Processing difficulties can be faced, the problems such as processing cost is higher.The price is very expensive for true triaxial experimental system itself, and to wrapping up sample It is anti-let out set it is more demanding, which again increases experimental costs.In addition, when true triaxial experimental system is tested manipulate difficulty compared with Greatly, experimental precision is low.These all limit the depth of investigation of hydraulic fracturing technology to a certain extent.

Therefore, a kind of new hydraulic fracturing experiments method is developed to which water can be carried out in conventional rock mechanics experiment machine It forces and splits experimental study and be of great significance.

Invention content

For the deficiency of existing hydraulic fracturing experiments technology, of the invention first purpose is to provide a kind of be used in routine The device of hydraulic fracturing experiments is carried out in rock mechanics experiment machine, waterpower pressure is carried out in conventional rock mechanics experiment machine to realize Split experiment;Second object of the present invention is to provide the rock sample suitable for above device, smoothly to carry out hydraulic fracturing reality It tests;Third object of the present invention is to provide a kind of utilization above device and carries out hydraulic fracturing in conventional rock mechanics experiment machine The method of experiment to reduce experimentation cost and time, simplifies experimental implementation, increases control and the measurement accuracy of experiment.

Based on first purpose of the present invention, provided by the present invention for carrying out waterpower in conventional rock mechanics experiment machine The device of fracturing experiments, push-down head and axial compression bar including being arranged on triaxial chamber chassis act on seaming chuck thereon, are nested with Pressure water is prevented to be mixed into the anti-of confining pressure oil in triaxial chamber outside rock sample and lets out set and infiltration plate, seaming chuck and push-down head design There is pressure flow road, and one of both is composite structure pressure head, by acting on the effect pressure head of rock sample and transfer head structure Into, effect pressure head couple with transfer head by convex-concave intercalation structure, it is described prevent let out set upper and lower ends be fixed on seaming chuck with On push-down head;Pressure water seepage flow hole is distributed on the infiltration plate, be arranged on pressure water go out to flow the rock sample at end and pressure head it Between.

The above-mentioned device for the progress hydraulic fracturing experiments in conventional rock mechanics experiment machine preferentially designs push-down head For composite structure pressure head, seaming chuck is overall structure pressure head.The effect pressure head and transfer head of composite structure push-down head are formed, it is excellent The intercalation structure for being first designed as forming by acting on the boss on cavity and transfer head on pressure head couples.It acts on pressure head Cavity decision design is reentrant cylindrical cavity, and the boss decision design on transfer head is cylindrical boss, acts on the upper end of pressure head Face central design has the boss for being inserted into rock sample blind hole, and the boss is designed with the stream of pressure water injection rock sample blind hole Road.The top surface of transfer head cylindrical boss and cylinder separately design the seal groove for being useful for embedding sealing circle, to assemble When embedding sealing circle prevent pressure water and confining pressure oil from mixing and oozing.

The above-mentioned device for the progress hydraulic fracturing experiments in conventional rock mechanics experiment machine, seaming chuck and push-down head Diameter is preferably equal with the diameter of rock sample.

The above-mentioned device for the progress hydraulic fracturing experiments in conventional rock mechanics experiment machine, the anti-both ends for letting out set It can be fixed on the upper and lower pressure head of seaming chuck by tightening sealing ring.

The above-mentioned device for the progress hydraulic fracturing experiments in conventional rock mechanics experiment machine, anti-let out cover preferred bullet Property the anti-of material lets out set.

Based on second goal of the invention of the present invention, the rock sample provided by the invention suitable for above device is described Rock sample is cylindrical structure sample, and one end center is machined with blind cylindrical hole, top closure is provided in blind cylindrical hole Sleeve, it is blind that the pressure water being machined on the top of the sleeve or barrel in guiding injection sleeve enters rock sample cylinder The flow guiding slit in hole.

Based on second goal of the invention of the present invention, the above device provided by the invention that is based on is in conventional rock mechanics experiment The method that hydraulic fracturing experiments are realized on machine, operating procedure are as follows:

(1) blind cylindrical hole is drilled through at standard cylinder rock sample center, blind hole diameter is more than sleeve outer and work With the boss diameter on pressure head, and casing and the boss acted on pressure head is enable to be embedded in blind hole and be bondeds closely, the length of blind hole It spends equal with the sum of casing length and the boss height for acting on pressure head;

(2) casing is put into the blind hole of sample, one end of closing is machined with blind hole towards the blind hole bottom of sample in sample The end face of one end, the effect upper surface of pressure head, the boss cylinder of transfer head, boss top end face dock place's coated structure with casing Glue then by the boss of the blind hole mouth alignment effect pressure head of sample, makes in boss insertion blind hole, realizes sample with acting on pressure head Bonding, and make casing Nian Jie with effect pressure head boss, bonding sample and push-down head are stood into 1~2 angel's structure adhesive curing, Bonding is secured;

(3) sealing ring is installed in the seal groove on transfer head, by the effect pressure head and transfer head of bonding sample Assembly and connection is good, is then inserted into the plug of transfer head lower part in the triaxial chamber chassis of rock mechanics experiment machine, and will conversion Fluid channel in pressure head is connected with upstream pressure oral siphon road;

(4) geotextiles, filter paper, infiltration plate, seaming chuck are sequentially placed in sample upper surface, seaming chuck is wrapped with rubber sleeve To the effect pressure head section of push-down head, and with tighten sealing element by rubber sleeve upper and lower side respectively with upper push-down head banding, by seaming chuck Internal fluid channel is connected with downstream outlet pipeline;

(5) inside triaxial chamber, symmetrical placement two LVDT displacement sensors in rock sample both sides are used for test sample axis To deformation, a circumferential extensometer is disposed then to be tried for test sample circumferential deformation with rock mechanics in the middle part of rock sample Test the hydraulic device lifting triaxial chamber chassis of machine, it made to be connected with the triaxial chamber of rock mechanics experiment machine, fix triaxial chamber with The self-balancing screw rod on chassis, it is oil-filled to triaxial chamber, and axial compression bar decline is made to combine closely with seaming chuck;

(6) confining pressure, axis pressure are added into predetermined state using the confining pressure of rock mechanics experiment machine, axis press pump, with flow control Pattern applies hydraulic pressure, until rock sample ruptures, completes hydraulic fracturing experiments;

(7) after the test, test specimen is removed, the sample to bond together and push-down head are baked bonding agent to mistake with electric furnace Sample is removed after effect, cleaning push-down head is in case follow-up test reuses.

It is above-mentioned preferably as follows for carrying out the size of the device of hydraulic fracturing experiments in conventional rock mechanics experiment machine:

Seaming chuck:50~100mm of diameter;

Push-down head acts on pressure head:(its outer diameter is drilled through blind with sample by 50~100mm of diameter, 5~10mm of boss diameter Hole, sleeve outer are equal), 5~10mm of boss height, 25~50mm of reentrant cylindrical cavity diameter (boss diameters with crossover sub It is equal), reentrant cylindrical cavity depth is 20mm;

Push-down head crossover sub:50~100mm of main diameter, boss 25~50mm of diameter, boss height 20mm;

Permeate plate:50~100mm of diameter, thickness 3mm;

Casing:Outer diameter is identical with the blind hole diameter size that sample is drilled through, and internal diameter is slightly larger than fluid channel diameter, on casing Open

0.1~1mm of mouth width degree, 2~10mm of length, the sum of casing length and push-down head boss height are drilled through equal to sample Blind hole depth;

3~5mm of fluid channel diameter;

In the above method, step (2) test specimen be provided with the bottom surface of blind hole one end, the upper bottom surface of push-down head, push-down head it is convex Platform side, top surface when place's coated structure glue is docked with casing of boss, can the grafting one in the seepage channel of the boss of push-down head Root diversion pipe occupies seepage channel mouth, and the structure glue when the top surface of boss applies structure glue is avoided to block seepage channel.Coating is completed After diversion pipe can be pulled out and be bonded with test specimen again, can not also pull out.

Applicable test specimen is matched with pressure head of the present invention, i.e. rock sample in the method for the present invention step (1) can pass through Following methods processing and fabricating:

On the deep underground core or rock mass of appearing of acquisition using drilling machine with cut bed by sample preparatory processing into diameter about For 50~100mm, be highly that 2.0~2.5 times of cylinder of diameter is studied as ontology, using grinding machine to two end faces of cylinder It polishes, makes its flat smooth, until meeting Rock Mechanics Test code requirement.Then using electric drill at test specimen one end center A diameter of 5~10mm is drilled through at line, the cylinder aperture that depth is 20~100mm, after sample machines, aperture is carried out clear It washes, ensures that no residue is left in hole.

Compared with prior art, the invention has the advantages that:

1st, it is realized using pressure head of testing machine of the present invention and experimental method and carries out water in conventional rock mechanics experiment machine Power fracturing experiments.

2nd, compared with the hydraulic fracturing experiments based on true triaxial equipment, the method for the invention only need to be to the cylinder of taking-up Core sample bores a blind hole to match with casing, without carrying out the processing such as complicated cutting and polishing to core sample Means can effectively reduce test specimen processing and the cost entirely tested and process time.

3rd, compared with the hydraulic fracturing experiments based on true triaxial equipment, the present invention carries out waterpower on conventional mechanics machine Fracturing experiments, required equipment cost is cheap, and all devices are reusable, is effectively controlled experimental cost, and operate It is simpler, it is easy to accomplish, at the same equipment control and measurement accuracy greatly improve, improve to a certain extent hydraulic fracturing reality The operating efficiency and success rate tested, for further further investigation hydraulic fracturing mechanism is laid a good foundation from now on.

4th, the push-down head that the method for the invention uses is simple in structure, is easy to largely process in batch, and during each experiment only Push-down head is needed to change, without being dismantled, being installed to equipment other component, saves valuable time.

Description of the drawings

Fig. 1 is of the present invention in the device of progress hydraulic fracturing experiments in conventional rock mechanics experiment machine The sectional view of pressure head.

Fig. 2 is under of the present invention be used in conventional rock mechanics experiment machine in the device of progress hydraulic fracturing experiments The sectional view of the effect pressure head of pressure head.

Fig. 3 is under of the present invention be used in conventional rock mechanics experiment machine in the device of progress hydraulic fracturing experiments The sectional view of the transfer head of pressure head.

Fig. 4 infiltrations of the present invention in the device of progress hydraulic fracturing experiments in conventional rock mechanics experiment machine The structure diagram of plate.

The sectional view of Fig. 5 rock samples of the present invention.

The sectional view of sleeve in Fig. 6 rock samples of the present invention.

Fig. 7 is the device of the present invention for the progress hydraulic fracturing experiments in conventional rock mechanics experiment machine in routine Assembling schematic diagram on mechanics machine.

In figure, 1-triaxial chamber chassis, 2-push-down head, 3-axial direction compression bar, 4-seaming chuck, 5-pressure flow road, 6- Confining pressure oil, 7-it is anti-let out set, 8-permeate plate, 9-seal groove, 10-rock sample, 11-sleeve, 11-1-flow guiding slit, 12- Fracturing fluid outlet passage, 13-triaxial chamber wall.

Specific embodiment

It is used to realize waterpower pressure in conventional rock mechanics experiment machine to of the present invention below by specific embodiment The device and rock sample for splitting experiment are described further with method.

Embodiment 1

It is as follows for carrying out the structure of the device of hydraulic fracturing experiments in conventional rock mechanics experiment machine:

By being arranged on the One On The Chassis push-down head 2 of triaxial chamber and axial compression bar 3 acts on seaming chuck 4 thereon and is nested with Prevent anti-set 7 and the infiltration plate 8 let out that pressure water is mixed into the elastic material of confining pressure oil 6 in triaxial chamber from forming outside rock sample.Upper pressure Head and push-down head are designed with pressure flow road 5, and the anti-upper and lower ends for letting out set (buy institute in market by tightening sealing ring ) be fixed on seaming chuck and push-down head;Pressure water seepage flow hole is distributed on the infiltration plate, is arranged on pressure water and goes out to flow end Between rock sample and pressure head;The seaming chuck is overall structure pressure head;The push-down head is composite structure pressure head, by acting on The effect pressure head 2-1 and transfer head 2-2 of rock sample 10 are formed, and pressure head and transfer head are acted on, by acting on pressure head The intercalation structure connection that boss on cavity and transfer head is formed.It is reentrant cylindrical cavity to act on the cavity on pressure head, and conversion is pressed Boss on head is cylindrical boss, and acting on the upper surface central design of pressure head has the boss for being inserted into rock sample blind hole, described Boss is designed with the runner of pressure water injection rock sample blind hole.The top surface of transfer head cylindrical boss and cylinder separately design It is useful for the seal groove 9 of embedding sealing circle.The diameter of seaming chuck and push-down head is equal with the diameter of rock sample.

Pressure head of testing machine the size of each part:

Seaming chuck:Diameter 50mm;

Push-down head acts on pressure head:Diameter 50mm, boss diameter 5mm (equal with blind hole that sample is drilled through, sleeve outer), Boss height 5mm, cylinder shape groove diameter 25mm (equal with the boss diameter of push-down head crossover sub), cylinder shape groove depth For 20mm;

Push-down head crossover sub:Main diameter 50mm, boss diameter 25mm, boss height 20mm;

Permeate plate:Diameter 50mm, thickness 3mm;

Casing:Outer diameter is identical with the blind hole diameter size that sample is drilled through, and internal diameter 4mm (is slightly larger than fluid channel diameter), Opening width 1mm, length 3mm, casing length 15mm are (deep equal to the blind hole that sample is drilled through with the sum of push-down head boss height Degree);

Fluid channel diameter 3mm;

This experiment rock mechanics experiment machine used is the Rock Triaxial V4 rock mechanics of TOP companies of France production Experimental system.

Experimental method:

The method using the present invention for being installed on conventional rock mechanics experiment machine and realizing hydraulic fracturing experiments, operating procedure is such as Under:

(1) on the deep underground core of acquisition or rock mass of appearing using drilling machine with cut bed by sample preparatory processing into diameter About 50mm, highly it is that 2 times of cylinder of diameter is studied as ontology, is polished using grinding machine two end faces of cylinder, Make its flat smooth, until meeting Rock Mechanics Test code requirement.Then it is drilled through using electric drill in test specimen one end centerline A diameter of 5mm, the cylinder aperture that depth is 20mm, after sample machines, clean aperture, ensure that no residue is left Kong Zhong.

(2) sleeve is put into the blind hole of sample, one end of closing is machined with blind hole towards the blind hole bottom of sample in sample The end face of one end, the effect upper surface of pressure head, the boss cylinder of transfer head, boss top end face dock place's coated structure with casing Then the blind hole mouth of sample is directed at the boss of lower effect pressure head by glue, make in boss insertion blind hole, realize sample and effect pressure head Bonding, and make sleeve with effect pressure head boss it is Nian Jie, by bonding sample and push-down head standing 1~2 angel's structure glue consolidate Change, bonding is secured;

(3) sealing ring is installed in the seal groove on transfer head, pressure head under the action of bonding sample and conversion is pressed Head assembly and connection is good, is then inserted into the plug of transfer head lower part in the triaxial chamber chassis of rock mechanics experiment machine, and will turn The fluid channel changed in pressure head is connected with upstream pressure oral siphon road;

(4) geotextiles, filter paper, infiltration plate, seaming chuck are sequentially placed in sample upper surface, set is let out with anti-and is wrapped seaming chuck To the effect pressure head section of push-down head, and with tighten sealing ring anti-will let out set upper and lower side respectively with upper push-down head banding, by seaming chuck Internal fluid channel is connected with downstream outlet pipeline;

(5) inside triaxial chamber, symmetrical placement two LVDT displacement sensors in rock sample both sides are used for test sample axis To deformation, a circumferential extensometer is disposed then to be tried for test sample circumferential deformation with rock mechanics in the middle part of rock sample Test the hydraulic device lifting triaxial chamber chassis of machine, it made to be connected with the triaxial chamber of rock mechanics experiment machine, fix triaxial chamber with The self-balancing screw rod on chassis, it is oil-filled to triaxial chamber, and axial compression bar decline is made to combine closely with seaming chuck;

(6) confining pressure, axis pressure are added into predetermined state using the confining pressure of rock mechanics experiment machine, axis press pump, with flow control Pattern applies hydraulic pressure, until rock sample ruptures, completes hydraulic fracturing experiments;

(7) after the test, test specimen is removed, the sample to bond together and push-down head are baked bonding agent to mistake with electric furnace Sample is removed after effect, cleaning push-down head is in case follow-up test reuses.

Claims (7)

1. the method for hydraulic fracturing experiments is carried out in conventional rock mechanics experiment machine, which is characterized in that hydraulic fracturing experiments exist It is carried out in conventional rock mechanics experiment machine, the conventional rock mechanics experiment machine includes being arranged on triaxial chamber chassis(1)On under Pressure head(2), axial compression bar(3)The seaming chuck of effect thereon(4), seaming chuck and push-down head are designed with pressure flow road(5), set Put prevents pressure water to be mixed into confining pressure oil in triaxial chamber outside rock sample(6)Anti- let out set(7)With infiltration plate(8), it is described to prevent letting out The upper and lower ends of set are fixed on seaming chuck and push-down head;Pressure water seepage flow hole is distributed on the infiltration plate, is arranged on pressure Water goes out to flow between the rock sample at end and pressure head;One of seaming chuck and push-down head be composite structure pressure head, composite structure pressure head by Act on the effect pressure head of rock sample(2-1)And transfer head(2-2)It forms, is pressed by acting on the cavity on pressure head and conversion Boss on head forms the connection of intercalation structure, and effect pressure head end face central design has the boss that intercalation enters rock sample blind hole, makees The runner of pressure water injection rock sample blind hole is designed with the boss on pressure head end face;Test operation step is as follows:
(1) blind cylindrical hole is drilled through at the rock sample center of standard cylinder, blind hole diameter makes on sleeve and effect pressure head Boss can be embedded in blind hole and be bonded close, the sum of the length of blind hole and the boss height of length sleeve and effect pressure head phase Deng, and the pressure water being machined on sleeve top or barrel in guiding injection sleeve enters the water conservancy diversion of rock sample blind cylindrical hole Seam(11-1);
(2) sleeve is put into the blind hole of rock sample, one end of closing is towards the blind hole bottom of rock sample, in rock sample It is machined with the end face, the effect upper surface of pressure head, the boss cylinder of transfer head, boss top end face and docking sleeve of blind hole one end Locate coated structure glue, then by the boss of the blind hole mouth alignment effect pressure head of rock sample, make in boss insertion blind hole, realize rock Stone sample is bonding with effect pressure head, and makes sleeve Nian Jie with effect pressure head boss, by bonding rock sample and push-down head 1~2 angel's structure adhesive curing is stood, bonding is secured;
(3)Sealing ring is installed in seal groove on transfer head, by the effect pressure head and transfer head of bonding rock sample Assembly and connection is good, is then inserted into the plug of transfer head lower part in the triaxial chamber chassis of rock mechanics experiment machine, and will conversion Fluid channel in pressure head is connected with upstream pressure oral siphon road;
(4)Geotextiles, filter paper, infiltration plate, seaming chuck are sequentially placed in rock sample upper surface, set is let out with anti-and is wrapped seaming chuck To the effect pressure head section of push-down head, and with tighten sealing element anti-will let out set upper and lower side respectively with upper push-down head banding, by seaming chuck Internal fluid channel is connected with downstream outlet pipeline;
(5)Inside triaxial chamber, symmetrical placement two LVDT displacement sensors in rock sample both sides are used to test rock sample axis To deformation, a circumferential extensometer is disposed then to be tried for test sample circumferential deformation with rock mechanics in the middle part of rock sample Test the hydraulic device lifting triaxial chamber chassis of machine, it made to be connected with the triaxial chamber of rock mechanics experiment machine, fix triaxial chamber with The self-balancing screw rod on chassis, it is oil-filled to triaxial chamber, and axial compression bar decline is made to combine closely with seaming chuck;
(6) confining pressure, axis pressure are forced into predetermined state using the confining pressure of rock mechanics experiment machine, axis press pump, with flow control mould Formula applies hydraulic pressure, until rock sample ruptures, completes hydraulic fracturing experiments;
(7) after the test, remove test specimen, by the rock sample to bond together and push-down head with electric furnace by bonding agent bake to Sample is removed after failure, cleaning push-down head is in case follow-up test reuses.
2. the method according to claim 1 that hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine, feature It is push-down head for composite structure pressure head, seaming chuck is overall structure pressure head.
3. the method according to claim 2 that hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine, feature It is to act on the cavity on pressure head for reentrant cylindrical cavity, the boss on transfer head is cylindrical boss.
4. the method according to claim 3 that hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine, feature It is that the top surface of transfer head cylindrical boss and cylinder separately design the seal groove for being useful for embedding sealing circle(9).
5. the method that hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine according to one of Claims 1-4, It is characterized in that the diameter of seaming chuck and push-down head is equal with the diameter of rock sample.
6. the method that hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine according to one of Claims 1-4, It is characterized in that the anti-both ends for letting out set are fixed on by tightening sealing ring on the upper and lower pressure head of seaming chuck.
7. the method according to claim 6 that hydraulic fracturing experiments are carried out in conventional rock mechanics experiment machine, feature It is that the anti-set of letting out lets out set for the anti-of elastic material.
CN201610084533.1A 2016-02-05 2016-02-05 The device of realization hydraulic fracturing experiments and rock sample and method in conventional rock mechanics experiment machine CN105628507B (en)

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