CN104697878A - A brecciation degree testing device for cracked wall surfaces and a method - Google Patents

A brecciation degree testing device for cracked wall surfaces and a method Download PDF

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Publication number
CN104697878A
CN104697878A CN201310655885.4A CN201310655885A CN104697878A CN 104697878 A CN104697878 A CN 104697878A CN 201310655885 A CN201310655885 A CN 201310655885A CN 104697878 A CN104697878 A CN 104697878A
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China
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rock sample
pressure
hydraulic cylinder
crack
sidewall
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CN201310655885.4A
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CN104697878B (en
Inventor
张福祥
周新源
杨向同
袁学芳
张扬
张日兴
刘洪涛
刘明球
郇国庆
周鹏遥
雷胜林
任春玲
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Petrochina Co Ltd
China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Abstract

A brecciation degree testing device for cracked wall surfaces and a method are disclosed. The device is used for subjecting test rock samples split into a first rock sample and a second rock sample to brecciation degree testing, and comprises a support; a fixing device disposed on the support and used for fixing the first rock sample; a first hydraulic cylinder disposed on the support and used for applying a positive stress on the second rock sample so that the stress of lamination of the first and second rock samples is constant; a constant-pressure pump connected to the first hydraulic cylinder; a second hydraulic cylinder disposed on the support and used for applying a tangential stress on the second rock sample so that relative parallel sliding between the second rock sample and the first rock sample occurs, with the tangential stress being perpendicular to the positive stress; a constant flow pump connected to the second hydraulic cylinder; and a computer connected to the constant flow pump and used for recording the instant working pressure of the constant flow pump and forming a time-pressure curve. The device can evaluate the severity degree of brecciation for the cracked wall surfaces under shear stress.

Description

A kind of crack wall brecciation degree proving installation and method
Technical field
The present invention relates to crack wall brecciation process in oil-gas field development under the shearing slip effect of reservoir rock crack and brecciation degree carries out simulating and technical field of measurement and test, a kind of specifically crack wall brecciation degree proving installation and method.
Background technology
Along with the quickening of petroleum prospecting and development process, realize having become the important means of frscturing stable yields to effective exploitation that is hypotonic, Oil in Super-low Permeability fracture-type reservoir.Such reservoir rock compaction is high, fragility large, and natural fracture reaches full growth; Large-scale slippery water fracturing technology produces shearing slip by bringing out natural fracture, improve reservoir Penetration Signature, raising reservoir use rate, natural fracture generation shearing slip is hypotonic at some to the beneficial effect improving per-well production and recovery ratio, Oil in Super-low Permeability Fractured shale reservoir reconstruction obtains confirmation in putting into practice.
It is the brecciation that rock fracture wall produces under shear action that natural fracture generation shearing slip improves one of major reason of fracture permeability, crack wall rock failure is made to become dust to peel off from wall, support natural fracture wall, increase the width between natural fracture wall.Accurate evaluation is hypotonic, the crack wall brecciation degree of Oil in Super-low Permeability Fractured shale reservoir can provide this reservoir reconstruction effect and predict comparatively accurately.Brecciation degree is that rock fracture wall issues the severe degree of raw brecciation in the effect of shearing force; May be used for evaluating crack wall brecciation degree.But at present not used for the apparatus and method of test crack wall brecciation degree.
Because the problems that above-mentioned existing crack wall brecciation process and brecciation degree carry out simulating and measuring technology exists and defect, the present inventor is actively studied and is innovated, finally have developed a kind of crack wall brecciation degree proving installation and method of novelty, make it more have practicality.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the invention provides a kind of crack wall brecciation degree proving installation, to realize the test of wall brecciation degree in crack under shearing slip effect.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
Crack wall brecciation degree proving installation, for becoming the test rock sample of the first rock sample and the second rock sample to carry out the test of brecciation degree to splitting, comprising:
Support;
Stationary installation, is located on support, for being fixed the first rock sample;
First hydraulic cylinder, is located on support, the positive pressure that the force value for applying to make itself and the first rock sample superimposed to the second rock sample is constant;
Constant pressure pump, is connected with the first hydraulic cylinder, drives the first hydraulic cylinder to produce positive pressure;
Second hydraulic cylinder, is located on support, and for applying to make itself and the first rock sample produce the tangential pressure of opposing parallel slip to the second rock sample, described tangential pressure is vertical with described positive pressure;
Constant flow pump, is connected with the second hydraulic cylinder, drives the second hydraulic cylinder to produce tangential pressure;
Computer, is connected with constant flow pump, the instantaneous working pressure of real time record constant flow pump, and formation time-pressure curve.
As preferably, the bottom of described support is provided with illuminating lamp, and described illuminating lamp is relative with the gap that the first rock sample and the second rock sample fit.
As preferably, between the first piston bar of described first hydraulic cylinder and the second rock sample, be provided with sliding translation plate.
As preferably, described sliding translation plate comprises:
First is dull and stereotyped, comprises first surface and relative with first surface second, and wherein parallel on first surface to be provided with two relative L shapes protruding, and described two L shapes are protruding forms accommodating chute with described first surface;
Second is dull and stereotyped, is assemblied in the accommodating chute on the first flat board, and described second flat board is fixedly connected with the first piston bar of described first hydraulic cylinder, and the direction of accommodating chute is consistent with the force direction of the second hydraulic cylinder.
As preferably, the first surface of described first flat board has the first groove along accommodating chute direction, described second flat board has second groove corresponding with the first groove, and described first groove and the second groove are buckled into ball slide rail, are provided with ball in described ball slide rail.
As preferably, described support comprises bottom surface and is in turn connected into the first side wall of tubular, the second sidewall, the 3rd sidewall and the 4th sidewall, and described four sidewalls and bottom surface are connected to form the cuboid container of upper end open.
As preferably, described first hydraulic cylinder is located on the first side wall, and described second hydraulic cylinder is located on the second sidewall, and described second hydraulic cylinder is near the first side wall one end, and described stationary installation is located on the 4th sidewall, and described stationary installation is near the 3rd sidewall side.
As preferably, described stationary installation comprises adjusting bolt and fixed flat planar, described adjusting bolt is perpendicular to described 4th sidewall and be connected with described 4th sidewall thread, and the front portion of described adjusting bolt is stretched in described container, and described fixed flat planar is located at the front portion of adjusting bolt.
As preferably, the end face of described fixed flat planar is covered with rubber layer, and the one side contrary with being covered with rubber layer contacts with the front portion of described adjusting bolt.
As preferably, described first hydraulic cylinder comprises:
First hydraulic cavities, is opened on described the first side wall;
First piston, is located at described first hydraulic cavities, and the first hydraulic cavities is divided into the first propelling chamber and the first reseting cavity by described first piston, and described first reseting cavity is positioned at the inner side of the first side wall;
First piston bar, is connected with described first piston, and described first piston bar, through described the first side wall, stretches into described cuboid internal tank, the direction of motion of described first piston bar and described 3rd sidewalls orthogonal;
First seal cover board, is located at outside described the first side wall, for sealing described first hydraulic cavities, described first seal cover board having and is communicated with the first hydraulic oil inlet that described first advances chamber;
Constant pressure pump, connects the first hydraulic oil inlet by pipeline;
First reset oil-in, is opened on the first side plate, is communicated with the first reseting cavity;
Described second hydraulic cylinder comprises:
Second hydraulic cavities, is opened on described second sidewall;
Second piston, is located at described second hydraulic cavities, and the second hydraulic cavities is divided into the second propelling chamber and the second reseting cavity by described second piston, and described second reseting cavity is positioned at the inner side of the second sidewall;
Second piston rod, is connected with described second piston, and described second piston rod, through described second sidewall, stretches into described cuboid internal tank, the direction of motion of described second piston rod and described 4th sidewalls orthogonal;
Second seal cover board, is located at described second side-wall outer side, for sealing described second hydraulic cavities, described second seal cover board having and is communicated with the second hydraulic oil inlet that described second advances chamber;
Constant flow pump, connects the second hydraulic oil inlet by pipeline;
Second reset oil-in, is opened on the second side plate, is communicated with the second reseting cavity;
Wherein the first reset oil-in is connected with described constant flow pump by pipeline with the second reset oil-in.
As preferably, pipeline between described constant pressure pump and described and the first hydraulic oil inlet is provided with the first two-way valve, pipeline between described constant flow pump and the second hydraulic oil inlet is provided with the second two-way valve, and described constant flow pump and the pipeline between described first reset oil-in and the second reset oil-in are provided with the 3rd two-way valve.
Another object of the present invention for providing a kind of crack wall brecciation degree method of testing, to realize the test of wall brecciation degree in crack under shearing slip effect.The technical scheme realizing above-mentioned purpose is as follows:
Crack wall brecciation degree method of testing, comprises the steps:
1) cutting of the full diameter rock sample of drilling extracting core is polished into the test rock sample of certain specification, weighs the mass M of test rock sample, test rock sample is two pieces from middle splitting and is respectively the first rock sample and the second rock sample;
2) the first rock sample and the second rock sample are in statu quo docked along fracture plane, the first rock sample are fixed, the positive pressure of 1 ~ 15 MPa is applied to the second rock sample, make the second rock sample and the first rock sample superimposed;
3) keep positive pressure constant, the tangential pressure vertical with positive pressure is applied to the second rock sample, the second rock sample and the first rock sample is made to produce opposing parallel slip, crack wall between second rock sample and the first rock sample produces shear stress, and described tangential pressure is produced with constant traffic driven hydraulic cylinder by constant flow pump; The instantaneous working pressure of computer real time record constant flow pump, and formation time-pressure curve;
4) time, the overall process variation characteristic of m-pressure curve is that pressure is increased to peak value in time gradually, falls to rapidly a certain force value and descends fuctuation within a narrow range thereon, mineralization pressure steady section; According to time m-pressure curve variation characteristic, with the mathematical mean σ of the data calculating pressure of pressure steady section, then calculate crack wall shear stress τ=k × σ, wherein k is crack wall shear stress correction factor, k=S j/ S f, S jbe the cross-sectional area of the piston of the hydraulic cylinder applying tangential pressure, unit is square millimeter; S fbe the area of the fracture plane of test rock sample, unit is square millimeter.
5) crushed particles produced between the wall of crack is collected, the sieve number using API standard is 12 object sieve sieving approach particles, collect the particle on sieve and dust, and to weigh its quality be m gram, brecciation degree is calculated according to brecciation degree formula D=100 × m/ (M × τ), m is dust quality, unit of gram; M is test rock sample quality, unit of gram; τ is the shear stress that crack wall is subject to, unit MPa.
As preferably, described crack wall brecciation degree method of testing is realized by above-mentioned arbitrary described device.
Compared with prior art, beneficial effect of the present invention is:
1, the present invention can the fracture wall severe degree that issues raw brecciation in shear stress evaluate, for corresponding reservoir reconstruction provides checking basis.
2, the present invention installs illuminating lamp bottom experiment container, can be observed the brecciation process of crack wall by the diffraction of light in crack gaps more clearly.
3, the present invention adopts orthogonal first hydraulic cylinder of direction of motion and the second hydraulic cylinder to achieve the simulation of the down cut slippage of crack wall positive pressure; Can the doubling plate design of relative sliding effectively reducing under positive pressure effect the border constraint that rock sample produces of sliding translation plate.
4, the present invention ensure that stable crack shearing slip displacement by slide displacement limiting plate.
Accompanying drawing explanation
Fig. 1 is the plan structure schematic diagram of an embodiment of the present invention;
Fig. 2 is the cross-sectional structural representation of another embodiment of the present invention;
Fig. 3 is the structural representation of sliding translation plate in the present invention;
Fig. 4 is the structural representation of the first flat board of sliding translation plate in the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is described in further detail, but not as a limitation of the invention.
Embodiment 1
Fig. 1 is the plan structure schematic diagram of an embodiment of the present invention; Fig. 3 is the structural representation of sliding translation plate in the present invention; Fig. 4 is the structural representation of the first flat board of sliding translation plate in the present invention.It is the cross-sectional structural representation of another embodiment of the present invention with reference to figure 2, Fig. 2 simultaneously.As shown in Figure 1, Figure 2, Figure 3 and Figure 4, crack wall brecciation degree proving installation, for becoming the test rock sample of the first rock sample and the second rock sample to carry out the test of brecciation degree to splitting, comprising:
Support 1;
Stationary installation 4, is located on support 1, for being fixed the first rock sample;
First hydraulic cylinder 6, is located on support 1, the positive pressure that the force value for applying to make itself and the first rock sample superimposed to the second rock sample is constant;
Constant pressure pump 2, is connected with the first hydraulic cylinder 6, drives the first hydraulic cylinder 6 to produce positive pressure;
Second hydraulic cylinder 7, is located on support 1, and for applying to make itself and the first rock sample produce the tangential pressure of opposing parallel slip to the second rock sample, tangential pressure is vertical with positive pressure;
Constant flow pump 3, is connected with the second hydraulic cylinder 7, drives the second hydraulic cylinder 7 to produce tangential pressure;
Computer 10, is connected with constant flow pump 3, the instantaneous working pressure of real time record constant flow pump 3, and formation time-pressure curve.
In the present embodiment, constant pressure pump 2 and the first hydraulic cylinder 6 concrete is connected and constant flow pump 3 can be known with concrete those skilled in the art of connection of the second hydraulic cylinder 7 from prior art, does not repeat them here.
Preferred as above-described embodiment, the bottom of support 1 is provided with illuminating lamp 14, and illuminating lamp 14 is relative with the gap that the first rock sample and the second rock sample fit.
Preferred as another of above-described embodiment, the end of the first piston bar 601 of the first hydraulic cylinder 6 is provided with sliding translation plate 8.Sliding translation plate 8 comprises:
First flat board 801, comprises first surface 811 and second face 812 relative with first surface 811, wherein parallelly on first surface 811 is provided with relative two L shape projection 813, two L shapes protruding 813 and forms accommodating chute 814 with first surface 811;
Second flat board 802, is assemblied in the accommodating chute 814 on the first flat board 801, and second dull and stereotyped 802 is fixedly connected with the first piston bar 601 of the first hydraulic cylinder 6, and the direction of accommodating chute 814 is consistent with the force direction of the second hydraulic cylinder 7.Sliding translation plate 8 can effectively reduce under positive pressure effect the border constraint that rock sample produces in the doubling plate design of relative sliding.Further, the first surface 811 of the first flat board 801 has the first groove 815 along accommodating chute 814 direction, second flat board 802 has second groove 825, first groove 815 corresponding with the first groove 815 and the second groove 825 is buckled into ball slide rail, in ball slide rail, be provided with ball 803.Effectively reducing frictional resistance by arranging ball 803 between the first dull and stereotyped 801 and second flat board 802, reducing positive pressure to the impact of rock sample tangential frost-heaves.Certainly, also can adopt and other modes such as lube layer or graphite linings are set realize.
In addition, the end of the second piston rod 701 of the second hydraulic cylinder 7 is provided with and shears pushing plate 9.Size and its end face size for the rock sample promoted of shearing pushing plate 9 are similar, thus make rock sample entirety stressed.Shearing pushing plate 9 can be fixedly connected with the second piston rod 701.
The concrete shape of medium-height trestle 1 of the present invention is not limit, and is mainly used for installation and fixes the first hydraulic cylinder 6, second hydraulic cylinder 7 and stationary installation 4 etc.First rock sample can be fixed separately or with support 1 by stationary installation 4 jointly.As support 1 being designed to a container, so that collect the dust produced in test process.
Preferred as above-described embodiment, support 1 comprises bottom surface 105 and is in turn connected into the cuboid container that the first side wall 101, second sidewall 102 of tubular, the 3rd sidewall 103 and the 4th sidewall 104, four sidewalls and bottom surface 105 are connected to form upper end open.Like this, test rock sample and be placed in container in test process, the dust of generation is convenient to collect.
Preferred as above-described embodiment, first hydraulic cylinder 6 is located on the first side wall 101, and the second hydraulic cylinder 7 is located on the second sidewall 102, and the second hydraulic cylinder 7 is near the first side wall 101 one end, stationary installation 4 is located on the 4th sidewall 104, and stationary installation 4 is near the 3rd sidewall 103 side.
Rock sample can be fixed separately or together with support 1 by stationary installation, and its concrete structure is not limit.As following structure can be adopted, stationary installation 4 comprises adjusting bolt 401 and fixed flat planar 402, adjusting bolt 401 is perpendicular to the 4th sidewall 104 and be threaded with the 4th sidewall 104, and the front portion of adjusting bolt 401 is stretched in container, and fixed flat planar 402 is located at the front portion of adjusting bolt 401.Fixed flat planar 402 can be peaked on the end face of rock sample by screwing adjusting bolt 401.Or fixed flat planar 402 is rotationally connected with the front end of adjusting bolt 401 also can.Further, be covered with rubber layer 403 at the end face of fixed flat planar 402, the one side contrary with being covered with rubber layer 403 contacts with the front portion of described adjusting bolt 401.And rubber layer 403 contacts with rock sample, friction force between the two can be increased, and form buffering.
Preferably another as above-described embodiment, proving installation of the present invention also has slide displacement restraint device 5, to limit the sliding distance of the second rock sample.One is to provide different-thickness slide displacement confinement plate (as shown in Figure 2), selects the length that the slide displacement confinement plate of different-thickness makes the distance between the second rock sample and support 1 suit the requirements as required.Or slide displacement restraint device 5 adopts the above-mentioned structure identical with stationary installation 4 (see Fig. 1, not arranging rubber layer), adjust the sliding distance of the second rock sample by rotating adjusting bolt.
Embodiment 2
In above embodiment, the first hydraulic cylinder 6 and the second hydraulic cylinder 7 can be fixed on support 1 as independent parts.But in order to the integrally-built object such as neatly of proving installation of the present invention, the structure that the first hydraulic cylinder 6 and the second hydraulic cylinder 7 can be integrated with support 1.Other parts still can adopt the description of above-described embodiment.As shown in Figure 2, Fig. 2 is the cross-sectional structural representation of another embodiment of proving installation of the present invention.Simultaneously see Fig. 1, Fig. 3 and Fig. 4.First hydraulic cylinder 6 comprises:
First hydraulic cavities, is opened on the first side wall 101;
First piston 602, is located in the first hydraulic cavities, and the first hydraulic cavities is divided into the inner side that the first propelling chamber 604 and the first reseting cavity 605, first reseting cavity 605 are positioned at the first side wall 101 by first piston 602;
First piston bar 601, is connected with first piston 602, and first piston bar 601 is through the first side wall 101, and stretch into cuboid internal tank, the direction of motion of first piston bar 601 is vertical with the 3rd sidewall 103;
First seal cover board 603, is located at outside the first side wall 101, for sealing the first hydraulic cavities, the first seal cover board 603 has the first hydraulic oil inlet 606 that connection first advances chamber 604;
Constant pressure pump 2, connects the first hydraulic oil inlet 606 by pipeline;
First reset oil-in 607, is opened on the first side plate 101, is communicated with the first reseting cavity 605;
Second hydraulic cylinder 7 comprises:
Second hydraulic cavities, is opened on described second sidewall 102;
Second piston 702, is located in the second hydraulic cavities, and the second hydraulic cavities is divided into the inner side that the second propelling chamber 704 and the second reseting cavity 705, second reseting cavity 705 are positioned at the second sidewall 102 by the second piston 702;
Second piston rod 701, is connected with the second piston 702, and the second piston rod 701 is through the second sidewall 102, and stretch into cuboid internal tank, the direction of motion of the second piston rod 701 is vertical with the 4th sidewall 104;
Second seal cover board 703, is located at outside the second sidewall 102, for sealing the second hydraulic cavities, the second seal cover board 703 has the second hydraulic oil inlet 706 that connection second advances chamber 704;
Constant flow pump 3, connects the second hydraulic oil inlet 706 by pipeline;
Second reset oil-in 707, is opened on the second side plate 102, is communicated with the second reseting cavity 705;
Wherein the first reset oil-in 607 is connected with constant flow pump 3 by pipeline with the second reset oil-in 707.
The structure that in above-described embodiment, the first hydraulic cylinder 6 and the second hydraulic cylinder 7 integrate with support 1.First reset oil-in 607 and the second reset oil-in 707 can be connected with constant flow pump 3 respectively by pipeline, be communicated to and be connected to constant flow pump 3 by a pipeline afterwards together both also can being.
Preferred as above-described embodiment, constant pressure pump 2 and and the first hydraulic oil inlet 606 between pipeline be provided with the first two-way valve 15, pipeline between constant flow pump 3 and the second hydraulic oil inlet 706 is provided with the second two-way valve 16, and constant flow pump 3 and the pipeline between the first reset oil-in 607 and the second reset oil-in 707 are provided with the 3rd two-way valve 17.If the first reset oil-in 607 and the second reset oil-in 707 are connected respectively to constant flow pump 3, then the 3rd two-way valve 17 is set on connecting line respectively.If the first reset oil-in 607 is connected to constant flow pump 3 by a pipeline together with being communicated to the second reset oil-in 707 afterwards, then only need be provided with the 3rd two-way valve 17 on this pipeline.
The technical scheme of crack wall brecciation degree method of testing of the present invention is as follows:
Crack wall brecciation degree method of testing, comprises the steps:
1) cutting of the full diameter rock sample of drilling extracting core is polished into the test rock sample of certain specification, weighs the quality of test rock sample, test rock sample is two pieces from middle splitting and is respectively the first rock sample and the second rock sample;
2) the first rock sample and the second rock sample are in statu quo docked along fracture plane, the first rock sample are fixed, the positive pressure of 1 ~ 15 MPa is applied to the second rock sample, make the second rock sample and the first rock sample superimposed;
3) keep positive pressure constant, the tangential pressure vertical with positive pressure is applied to the second rock sample, the second rock sample and the first rock sample is made to produce opposing parallel slip, crack wall between second rock sample and the first rock sample produces shear stress, and described tangential pressure is produced with constant traffic driven hydraulic cylinder by constant flow pump; The instantaneous working pressure of computer real time record constant flow pump, and formation time-pressure curve;
4) time, the overall process variation characteristic of m-pressure curve is that pressure is increased to peak value in time gradually, falls to rapidly a certain force value and descends fuctuation within a narrow range thereon, mineralization pressure steady section; According to time m-pressure curve variation characteristic, with the mathematical mean σ of the data calculating pressure of pressure steady section, then calculate crack wall shear stress τ=k × σ, wherein k is constant.
5) crushed particles produced between the wall of crack is collected, the sieve number using API standard is 12 object sieve sieving approach particles, collect the particle on sieve and dust, and to weigh its quality be m gram, brecciation degree is calculated according to brecciation degree formula D=100 × m/ (M × τ), m is dust quality, unit of gram; M is test rock sample quality, unit of gram; τ is the shear stress that crack wall is subject to, unit MPa.
Crack wall brecciation degree method of testing of the present invention realizes by proving installation of the present invention.For embodiment 2.
Crack wall brecciation degree method of testing, comprises the steps:
The first, by the test rock sample of the full diameter rock sample of drilling extracting core cutting polishing growth 100 millimeters, wide 80 millimeters, the specification of high 60 millimeters, weighing its quality is M gram, use Brazilian splitting machine to carry out splitting to test rock sample and make seam, the splitting of test rock sample is become the first rock sample and second rock sample of 2 pieces 60 millimeters × 80 millimeters × 50 millimeters.Two pieces of rock samples are in statu quo docked along fracture plane, first rock sample againsts the 3rd sidewall inwall and loads container, second rock sample, near the first side wall, makes crack wall perpendicular to container bottoms, screws adjusting bolt 401 and first rock sample is fixed between fixed flat planar 402 and the second sidewall 102.Adjust slide displacement restraint device according to actual needs, thus determine the sliding distance of the second rock sample.
The second, the 3rd two-way valve in the feed line of the first reseting cavity is regulated to be placed in pressure release position, second two-way valve and the first two-way valve are all placed in UNICOM position, open computer 10, illuminating lamp 14, constant pressure pump 2 and constant flow pump 3, the force value arranging constant pressure pump 2 is 1 ~ 15 MPa, advance in chamber 604 to first and squeeze into hydraulic oil, first piston bar 601 promotes sliding translation plate 8 and moves to the second rock sample (the 3rd sidewall direction), apply normal stress to rock sample crack wall, in experimentation, constant pressure pump 2 keeps working pressure constant.Arranging constant flow pump 3 discharge capacity is 0.5 ~ 1 ml/min, advance in chamber 704 to second and squeeze into hydraulic oil, second piston rod 701 promotes to shear pushing plate 9 and moves to the 3rd sidewall 103 direction, thus promotion the second rock sample slides to the 3rd sidewall 103 direction, crack wall is made to produce the shear stress being parallel to crack wall, in experimentation, coordinate electron microscope can the appearance features of clear observational record crack slipping by the diffraction of the light of illuminating lamp 14 in crack gaps, the instantaneous working pressure of computer 4 real time record constant flow pump 3, logging interval was 1 second, and formation time-pressure curve, when the second rock sample moves to desired location, close constant pressure pump 2 and constant flow pump 3.
Three, time, the overall process variation characteristic of m-pressure curve is that pressure is increased to peak value in time gradually, falls to rapidly a certain force value and in the upper and lower fuctuation within a narrow range change of this value, forms stress steady section; According to time m-pressure curve variation characteristic, with the mathematical mean σ of the data calculating pressure of pressure steady section, then calculate crack wall shear stress τ, τ=k × σ, wherein k is crack wall shear stress correction factor, k=S j/ S f, S jbe the cross-sectional area of the piston (i.e. the second piston 702) of the hydraulic cylinder applying tangential pressure, unit is square millimeter; S fbe the area of the fracture plane of test rock sample, unit is square millimeter.
The 3rd two-way valve in the feed line of four, the first reseting cavity and the second reseting cavity is placed in UNICOM position, first two-way valve and the second two-way valve are all placed in pressure release position, again opening constant flow pump 3 uses the discharge capacity of 0.5 ml/min to injection liquid force feed in the reseting cavity of two pistons, make first piston and the second piston reset, close constant flow pump 3.
Five, take out rock sample, collect the crushed particles produced between the wall of crack; The sieve number using API standard is 12 object sieve sieving approach particles, and collecting the particle (dust) on sieve and weighing its quality is m gram, calculates brecciation degree D according to brecciation degree formula D=100 × m/ (M × τ).
Above embodiment is only exemplary embodiment of the present invention, and be not used in restriction the present invention, protection scope of the present invention is defined by the claims.Those skilled in the art can in essence of the present invention and protection domain, and make various amendment or equivalent replacement to the present invention, this amendment or equivalent replacement also should be considered as dropping in protection scope of the present invention.

Claims (10)

1. crack wall brecciation degree proving installation, for becoming splitting the test rock sample of the first rock sample and the second rock sample to carry out the test of brecciation degree, is characterized in that, comprise:
Support;
Stationary installation, is located on support, for being fixed the first rock sample;
First hydraulic cylinder, is located on support, the positive pressure that the force value for applying to make itself and the first rock sample superimposed to the second rock sample is constant;
Constant pressure pump, is connected with the first hydraulic cylinder, drives the first hydraulic cylinder to produce positive pressure;
Second hydraulic cylinder, is located on support, and for applying to make itself and the first rock sample produce the tangential pressure of opposing parallel slip to the second rock sample, described tangential pressure is vertical with described positive pressure;
Constant flow pump, is connected with the second hydraulic cylinder, drives the second hydraulic cylinder to produce tangential pressure;
Computer, is connected with constant flow pump, the instantaneous working pressure of real time record constant flow pump, and formation time-pressure curve; The bottom of described support is provided with illuminating lamp, and described illuminating lamp is relative with the gap that the first rock sample and the second rock sample fit; Sliding translation plate is provided with between the first piston bar of described first hydraulic cylinder and the second rock sample.
2. crack wall brecciation degree proving installation according to claim 1, it is characterized in that, described sliding translation plate comprises:
First is dull and stereotyped, comprises first surface and relative with first surface second, and wherein parallel on first surface to be provided with two relative L shapes protruding, and described two L shapes are protruding forms accommodating chute with described first surface;
Second is dull and stereotyped, is assemblied in the accommodating chute on the first flat board, and described second flat board is fixedly connected with the first piston bar of described first hydraulic cylinder, and the direction of accommodating chute is consistent with the force direction of the second hydraulic cylinder; The first surface of described first flat board has the first groove along accommodating chute direction, described second flat board has second groove corresponding with the first groove, described first groove and the second groove are buckled into ball slide rail, are provided with ball in described ball slide rail.
3. crack wall brecciation degree proving installation according to claim 1, it is characterized in that, described support comprises bottom surface and is in turn connected into the first side wall of tubular, the second sidewall, the 3rd sidewall and the 4th sidewall, and described four sidewalls and bottom surface are connected to form the cuboid container of upper end open.
4. crack wall brecciation degree proving installation according to claim 3, it is characterized in that, described first hydraulic cylinder is located on the first side wall, described second hydraulic cylinder is located on the second sidewall, described second hydraulic cylinder is near the first side wall one end, described stationary installation is located on the 4th sidewall, and described stationary installation is near the 3rd sidewall side.
5. crack wall brecciation degree proving installation according to claim 3, it is characterized in that, described stationary installation comprises adjusting bolt and fixed flat planar, described adjusting bolt is perpendicular to described 4th sidewall and be connected with described 4th sidewall thread, the front portion of described adjusting bolt is stretched in described container, and described fixed flat planar is located at the front portion of adjusting bolt.
6. crack wall brecciation degree proving installation according to claim 3, it is characterized in that, the end face of described fixed flat planar is covered with rubber layer, and the one side contrary with being covered with rubber layer contacts with the front portion of described adjusting bolt.
7. crack wall brecciation degree proving installation according to claim 3, it is characterized in that, described first hydraulic cylinder comprises:
First hydraulic cavities, is opened on described the first side wall;
First piston, is located at described first hydraulic cavities, and the first hydraulic cavities is divided into the first propelling chamber and the first reseting cavity by described first piston, and described first reseting cavity is positioned at the inner side of the first side wall;
First piston bar, is connected with described first piston, and described first piston bar, through described the first side wall, stretches into described cuboid internal tank, the direction of motion of described first piston bar and described 3rd sidewalls orthogonal;
First seal cover board, is located at outside described the first side wall, for sealing described first hydraulic cavities, described first seal cover board having and is communicated with the first hydraulic oil inlet that described first advances chamber;
Constant pressure pump, connects the first hydraulic oil inlet by pipeline;
First reset oil-in, is opened on the first side plate, is communicated with the first reseting cavity;
Described second hydraulic cylinder comprises:
Second hydraulic cavities, is opened on described second sidewall;
Second piston, is located at described second hydraulic cavities, and the second hydraulic cavities is divided into the second propelling chamber and the second reseting cavity by described second piston, and described second reseting cavity is positioned at the inner side of the second sidewall;
Second piston rod, is connected with described second piston, and described second piston rod, through described second sidewall, stretches into described cuboid internal tank, the direction of motion of described second piston rod and described 4th sidewalls orthogonal;
Second seal cover board, is located at described second side-wall outer side, for sealing described second hydraulic cavities, described second seal cover board having and is communicated with the second hydraulic oil inlet that described second advances chamber;
Constant flow pump, connects the second hydraulic oil inlet by pipeline;
Second reset oil-in, is opened on the second side plate, is communicated with the second reseting cavity;
Wherein the first reset oil-in is connected with described constant flow pump by pipeline with the second reset oil-in.
8. crack wall brecciation degree proving installation according to claim 7, it is characterized in that, pipeline between described constant pressure pump and described and the first hydraulic oil inlet is provided with the first two-way valve, pipeline between described constant flow pump and the second hydraulic oil inlet is provided with the second two-way valve, and described constant flow pump and the pipeline between described first reset oil-in and the second reset oil-in are provided with the 3rd two-way valve.
9. crack wall brecciation degree method of testing, comprises the steps:
Step 1), the cutting of the full diameter rock sample of drilling extracting core is polished into the test rock sample of certain specification, weighs the mass M of test rock sample, test rock sample is two pieces from middle splitting and is respectively the first rock sample and the second rock sample;
Step 2), the first rock sample and the second rock sample are in statu quo docked along fracture plane, the first rock sample is fixed, the positive pressure of 1 ~ 15 MPa is applied to the second rock sample, make the second rock sample and the first rock sample superimposed;
Step 3), maintenance positive pressure are constant, the tangential pressure vertical with positive pressure is applied to the second rock sample, the second rock sample and the first rock sample is made to produce opposing parallel slip, crack wall between second rock sample and the first rock sample produces shear stress, and described tangential pressure is produced with constant traffic driven hydraulic cylinder by constant flow pump; The instantaneous working pressure of computer real time record constant flow pump, and formation time-pressure curve;
Step 4), time m-pressure curve overall process variation characteristic be that pressure is increased to peak value in time gradually, fall to rapidly a certain force value descend fuctuation within a narrow range thereon, mineralization pressure steady section; According to time m-pressure curve variation characteristic, with the mathematical mean σ of the data calculating pressure of pressure steady section, then calculate crack wall shear stress τ=k × σ, wherein k is crack wall shear stress correction factor, k=S j/ S f, S jbe the cross-sectional area of the piston of the hydraulic cylinder applying tangential pressure, unit is square millimeter; S fbe the area of the fracture plane of test rock sample, unit is square millimeter;
The crushed particles produced between step 5), collection crack wall, the sieve number using API standard is 12 object sieve sieving approach particles, collect the particle on sieve and dust, and to weigh its quality be m gram, brecciation degree is calculated according to brecciation degree formula D=100 × m/ (M × τ), m is dust quality, unit of gram; M is test rock sample quality, unit of gram; τ is the shear stress that crack wall is subject to, unit MPa.
10. crack wall brecciation degree method of testing according to claim 9, is characterized in that, described crack wall brecciation degree method of testing is realized by the device described in any one of claim 1-8.
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US5817946A (en) * 1996-10-28 1998-10-06 Test Quip, Inc. Gyratory compaction apparatus for creating compression and shear forces in a sample material
CN202166560U (en) * 2011-06-30 2012-03-14 中国科学院武汉岩土力学研究所 Three-shaft testing device for natural gas hydrate containing sediment
CN102980816A (en) * 2012-12-06 2013-03-20 重庆交通大学 Soil mass shearing rupture failure testing device and method
CN203191265U (en) * 2013-03-25 2013-09-11 中国有色金属工业昆明勘察设计研究院 Device applicable to indoor middle-type shear test

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5817946A (en) * 1996-10-28 1998-10-06 Test Quip, Inc. Gyratory compaction apparatus for creating compression and shear forces in a sample material
CN202166560U (en) * 2011-06-30 2012-03-14 中国科学院武汉岩土力学研究所 Three-shaft testing device for natural gas hydrate containing sediment
CN102980816A (en) * 2012-12-06 2013-03-20 重庆交通大学 Soil mass shearing rupture failure testing device and method
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