CN105334310A - Testing device and method for electrical characteristics of rock sample in multi-field coupling state - Google Patents
Testing device and method for electrical characteristics of rock sample in multi-field coupling state Download PDFInfo
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Abstract
The invention discloses a testing device for the electrical characteristics of a rock sample in a multi-field coupling state. The testing device comprises a resistivity test module, a stress test module, a seepage test module, an upper test probe and a lower test probe. The resistivity test module comprises a direct-current electric method instrument and a plurality of annular electrodes wound around the rock sample to be tested in a layered mode, and the annular electrodes are connected to the direct-current electric method instrument through a direct-current electric method instrument optical cable. Insulating protection layers are arranged on the upper end face and the lower end face of the rock sample to be tested respectively, gaps into which the upper test probe and the lower test probe stretch respectively are formed in the insulating protection layers respectively, and insulating fixing plates are arranged on the outer circumferential surface of the rock sample to be tested. The stress test module comprises a pressure device and a stress sampling device. The seepage test module comprises a high-pressure water inlet system which is communicated with a water inlet hole in the upper test probe, a water outlet is formed in the lower test probe, and a water flow meter is arranged in the water outlet. The invention further discloses a testing method using the testing device. The testing device is simple in structure and convenient to operate.
Description
Technical field
The present invention relates to a kind of rock sample electrical property feature proving installation, particularly rock sample electrical property feature proving installation and method of testing under stress-seepage state.
Background technology
North China type coalfield based on Permian-carboniferous is through the exploitation of over half a century, and mining depth enters deep, and workplace is deeply by high artesian, leptophragmata water layer dangerous threat, and floor undulation gushing water happens occasionally.Emerge in an endless stream based on high artesian, leptophragmata water layer mechanism of water inrush, but most mechanism of water inrush is just based upon on single influence factor, ideal model basis, differs greatly with Water Inrush scene, real work face.How accurately detecting occurrence status and the migration rule of floor undulation regimen, is the key problem of current solution Water Inrush.Current, to accurately detect floor undulation regimen, rock stratum electrical Changing Pattern under multi-scenarios method state must be solved, the impact that grasp stress and seepage flow change formation resistivity, therefore, under testing multi-scenarios method state, rock sample electrical property feature becomes the current problem needing solution badly.
Currently do not test the electrical property feature device of rock sample under multi-scenarios method state specially, only has the resistivity apparatus of test the earth and resistivity instrument under testing rock specimen in uniaxial stress state, therefore, design one can test electrical property feature device and method of testing under rock sample seepage-stress multi-scenarios method state, becomes current certainty of detecting Floor water end of love law.
Chinese patent application 201410400335.2 discloses a kind of power magnetoelectricity multi-field coupling measuring system, and comprising: power load-on module, power load-on module comprises connecting link, fixed pedestal, helmholtz coil, aluminum frame and force snesor; Magnetic load-on module, magnetic load-on module comprises: processing module, and processing module comprises signal generator, power display, lock-in amplifier and teslameter; Wherein, signal generator is connected with helmholtz coil, power display is connected with force snesor, lock-in amplifier is connected with test specimen upper and lower surface to be measured, power load-on module is nested in magnetic loading system, and fixing its relative position by fixed pedestal, fixed pedestal and aluminum frame are fixed by securing member, and force snesor is fixed in aluminum frame.This patent can realize the different field of force, different magnetic field coupling time compound substance magnetic electricity performance measurement.But this patent is mainly for the measuring system of magnetic electric compound material, be not the measuring system for rock, different with measuring object of the present invention, and research object character difference is too large.
Chinese patent ZL201310261472.8 discloses the long-term multi-scenarios method experimental provision of a kind of seepage pressure rock controlled with point ratio mutually and method of testing, and this experimental provision comprises triaxial cell, heterogeneous fluid mixed control apparatus, outlet fluid collection and measurement mechanism.Heterogeneous fluid mixed control apparatus comprises gas dosing pump, microprocessor pump drive, gas compression bottle, liquid reserve tank, mixer, control box, vacuum pump.Controlled the duty of volume pump by the level signal of control box, ensure the gas-liquid component ratio of constant seepage pressure and fluid-mixing.The method of testing of the rock long-term multi-scenarios method experiment that seepage pressure is controlled with point ratio is mutually the method for testing of carrying out on the basis of above-mentioned experimental provision, this patent is mainly used for the heat flow piercement creep test of study of rocks test specimen under different phase fluid-mixing osmosis, all different with object with the character of study of rocks of the present invention, therefore, relevance is not had with the present invention.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, rock sample electrical property feature proving installation and method of testing under a kind of multi-scenarios method state be provided, this proving installation structure is simple, scientific in principle, data accurately, convenient operation.
For achieving the above object, the present invention adopts following technical proposals:
Rock sample electrical property feature proving installation under a kind of multi-scenarios method state, comprises resistivity measurement module, stress test module, seepage flow test module and upper and lower test probe;
Described resistivity measurement module comprises electric method meter and the ring electrode of four layered windings on rock sample to be tested, four ring electrodes are connected at upper test probe place with electrical prospecting apparatus optical cable by ring electrode wire, are connected to electric method meter through electrical instrument optical cable; The upper and lower end face of rock sample to be tested is respectively arranged with insulating protective layer, and in insulating protective layer, is respectively arranged with the space stretched into for upper and lower test probe, rock sample outer circumference surface to be tested is provided with insulation fixing plate;
Described ring electrode and rock sample contact area greatly, are convenient to transmitting electrode and are powered to rock sample, prevent transmitting electrode from opening a way;
Described stress test module comprises the pressue device for pressurizeing to rock sample top to be tested and side and the stress harvester for gathering rock sample STRESS VARIATION to be tested;
Described seepage flow test module comprises water under high pressure water inlet system, and high-pressure water inlet system is communicated with the inlet opening in upper test probe, is provided with apopore, is provided with water yield flowmeter in apopore in lower test probe.
Described pressue device comprises hydraulic servo control system, hydraulic servo control system controls the top board pressurizer and the side direction pressurizer that are positioned at rock sample top to be tested and side respectively, and described side direction pressurizer is connected with the side direction fixed head abutting against described insulation fixing plate outside.
Described rock sample to be tested and side direction pressurizer are all arranged on base platform.
Described top board pressurizer and side direction pressurizer are hydraulic jack.
Described stress harvester comprises stress acquisition system, and stress acquisition system is connected with the stress acquisition probe in upper test probe by wire.
Described upper test probe comprises the hydraulic servo probe be arranged in probing shell, electric method meter optical cable, stress acquisition probe and inlet opening, hydraulic servo probe is connected with hydraulic servo control system, and described hydraulic servo probe all contacts with rock sample to be tested with stress acquisition probe.
Described lower test probe comprises housing, arranges the apopore of a up/down perforation in housing, arranges water yield flowmeter in apopore, and case top apopore upper port place is pit shape, is convenient to water and reserves.
Utilize the method for testing of rock sample electrical property feature proving installation under multi-scenarios method state, comprising:
(1) each model calling work
First the core of identical lithology is made same many parts, ensure that each rock sample length to be tested is identical, upper lower section is smooth, and upper and lower test probe fully contacts with rock sample to be tested simultaneously; With copper wire around rock sample one week, the ring electrode made also is fixed, and makes ring electrode contact intact with rock sample to be tested, prevents electrodes of A, B from opening a way; Before rock sample to be tested is placed on base platform, first insulating protective layer is placed on respectively the upper bottom surface of rock sample to be tested, leaves the space of probe shape at upper and lower test probe place, be convenient to upper and lower test probe and contact with rock sample to be tested; Rock sample and ring electrode are connected, again ring electrode wire (comprising ring electrode wire A, ring electrode wire B, ring electrode wire M, ring electrode wire N) is linked together with respective corresponding ring electrode respectively, again the resistivity optical cable in all ring electrode wires and upper probe is connected, resistivity main frame is connected with optical cable; Finally, utilize insulating protective layer rock sample to be tested and side direction fixed head and pressurizer to be isolated, prevent rock sample to be tested and other conductor contact, cause measurement result to occur error.
Secondly hydraulic servo control system and hydraulic pressure to be popped one's head in and stress test system and top board and side direction pressurizer connect, complete stress test model calling complete, be convenient to stress collection;
Finally, the apopore in the inlet opening in high-pressure water inlet system, upper test probe, the lower probe of test and water yield flowmeter are connected, completes seepage flow test module and connect, be convenient to seepage flow and measure; After each model calling completes, by airtight for rock sample to be tested, detect airtight intact after, can Test Data Collecting be carried out;
(2) single-factor variable data acquisition
A) electrical property feature under stress state
First when not adding stress, opening electric method meter, adopting symmetrical quadrupole device, according to the ring electrode position of binding, setting acquisition parameter, starts to test rock sample resistivity value, subsequently, open stress test module, by hydraulic control servo-control system hydraulic control servo probe and top or the acting in conjunction of side direction pressurizer, pressurize, along with the change of pressure constantly to rock sample to be tested, record rock sample change in resistance feature and rock fracture developmental state, until rock sample to be tested breaks; After rock sample to be tested breaks, then by stress test module, constantly give rock sample release to be tested, again observe rock sample change in resistance situation to be tested;
B) electrical property feature under seepage state
First when not adding seepage flow, open electric method meter, adopt symmetrical quadrupole device, according to the ring electrode position of binding, setting acquisition parameter, start to test rock sample resistivity value to be tested, subsequently, open seepage flow test module, intake from upper probe inlet opening by high-pressure water inlet system, the change of the test lower probe apopore water yield, according to the measure of the change seepage flow size of time and flow, measure rock sample change in resistance situation to be tested simultaneously, then constantly regulate the change of seepage flow, record rock sample resistivity value to be tested;
(3) multi-scenarios method data acquisition
A) before rock sample fragmentation to be tested, stress-seepage flow increases simultaneously, rock sample electrical property feature to be tested; Stress after rock sample fragmentation to be tested-seepage flow rock sample electrical property feature;
Open stress test module and seepage flow test module, increase stress and seepage flow simultaneously, record rock sample change in resistance feature to be tested and rock fracture developmental state, until rock sample to be tested breaks; After rock sample to be tested breaks, point three kinds of situation observations, one is that seepage flow is constant, constantly gives rock sample release to be tested, again observes rock sample Resistivity Characteristics to be tested; Two is increase seepage flow, reduces stress, observes rock sample change in resistance feature to be tested; Three is reduce seepage flow, reduces stress, observes rock sample change in resistance feature to be tested;
B) before rock sample fragmentation to be tested, stress increases, and seepage flow reduces, rock sample electrical property feature; Stress after rock sample fragmentation to be tested-seepage flow rock sample electrical property feature;
Open stress test module and seepage flow test module, increase stress, reduce seepage flow, record rock sample change in resistance feature to be tested and rock fracture developmental state, until rock sample breaks; After rock sample to be tested breaks, point three kinds of situation observations, one is that seepage flow is constant, constantly gives rock sample release to be tested, again observes rock sample Resistivity Characteristics to be tested; Two is increase seepage flow, reduces stress, observes rock sample change in resistance feature to be tested; Three is reduce seepage flow, reduces stress, observes rock sample change in resistance feature to be tested;
C) before rock sample fragmentation to be tested, stress reduces, and seepage flow increases, rock sample electrical property feature
Open stress test module and seepage flow test module, constantly reduce stress, increase seepage flow, record rock sample change in resistance feature and rock fracture developmental state.
(4) the base plate watery evolutionary model based on resistivity is set up
A) Changing Pattern between rock sample resistivity under stress and the single influence factor of seepage flow is analyzed;
B) Changing Pattern under stress-many, seepage flow state between rock sample resistivity is analyzed;
C) according to analyzing above, in conjunction with influence factor conditions such as rock lithology, the property of water-bearing, destructivenesses, the classification of rich regimen condition is carried out to rock resistivity, determine resistivity index and the parameter of rock watery partition of the level, for the occurrence status and migration rule accurately detecting floor undulation regimen lays the foundation.
Proving installation of the present invention is made up of the part such as resistivity measurement module, stress test module, seepage flow test module, test rock sample, upper test probe, lower test probe.Wherein resistivity measurement module comprises electric method meter, ring electrode A, ring electrode B, ring electrode M, ring electrode N, insulation fixing plate, insulating protective layer, ring electrode wire A, ring electrode wire B ring electrode wire M, ring electrode wire A etc.As long as electric method meter can adopt symmetrical four-stage device to measure rock sample resistivity.When measuring rock sample, electrode adopts ring electrode.Ring electrode copper wire, around core one week, is tightened on rock sample, is fully contacted with rock sample.Ring electrode, compared with ordinary electrode, has contact area many, easily fixes, the features such as convenient operation.Insulation fixing plate and insulating protective layer Main Function prevent in rock sample test process, and rock sample is connected with other conductor, cause resistivity measurement error.Insulating protective layer stays the space of probe shape at upper and lower probe place, be convenient to probe and contact with rock sample.
Stress test module is made up of hydraulic servo control system, hydraulic servo probe, stress acquisition system, side direction compression fixator, side direction fixed head, stress acquisition system, top compression device, base platform etc.Wherein hydraulic servo control system hydraulic control servo probe, with top compression device and the acting in conjunction of side direction pressurizer, realizes applying different stress to rock sample, and the STRESS VARIATION received rock by stress acquisition system, strain carry out data acquisition, Cheng Tu etc.
Seepage flow test module is made up of parts such as high-pressure water inlet system, inlet opening, apopore, water yield flowmeters.High-pressure water inlet system, by water timing by inlet opening enters in rock sample, by the water yield flowmeter metered flow in apopore, calculates the seepage flow value of rock sample.
Upper probe comprises the composition such as hydraulic servo probe, electric method meter optical cable, stress acquisition probe, inlet opening.Lower probe comprises the composition such as apopore, water yield flowmeter.Probe requires that resistance to compression insulating material is made up and down, and matrix is made in test crown portion, and being convenient to water can flow into lower probe smoothly.
The core that rock sample mainly takes out from down-hole drilling, core is unsuitable oversize, and cross-sectional area should not be too large, and core takes out from boring that not easily to put into the outdoor time oversize, prevents core too dry, not easy conductive, causes electrical instrument to open a way.
Structure of the present invention is simple, and easy to operate, instrument and equipment expense is low, experimental enviroment good, and under realizing multi-scenarios method state, rock sample electrical property feature is tested, and for the distribution of research mine bottom plate regimen provides test figure, guide field is produced.
The present invention utilizes stress test module and seepage flow module as research rock sample electrical property feature unitary variant factor respectively, test same rock sample rock sample cranny development rule and electrical property feature under different stress, set up rock sample cranny development rule and electrical corresponding model under different stress; Under different seepage flow condition, test rock sample electrical property feature, sets up rock sample seepage flow-electrical corresponding model; Based under stress module and the multifactor acting in conjunction of seepage flow module, test same rock sample electrical property feature under different stress-seepage flow, resistivity measurement of rock sample result under analysis multi-scenarios method state, in conjunction with rock lithology, the property of water-bearing, destructiveness, etc. factor, set up rock resistivity watery evolutionary model, determine resistivity index and the parameter of rock stratum watery partition of the level, for the occurrence status and migration rule accurately detecting floor undulation regimen lays the foundation.This test unit structure is simple, scientific in principle, data are accurate, convenient operation.
Accompanying drawing explanation
Fig. 1 is the proving installation structural representation of one embodiment of the invention;
Fig. 2 is upper test probe structural representation;
Fig. 3 is lower test probe structural representation;
Wherein, 1. electric method meter, 2. hydraulic servo control system, 3. side direction pressurizer, 4. stress acquisition system, 5. high-pressure water inlet system, 6. go up test probe, 7. base platform, 8. descend test probe, 9. rock sample to be tested, 10. insulating protective layer, 11. side direction fixed heads, 12. insulation fixing plates, 13. ring electrode A, 14. ring electrode B, 15. ring electrode M, 16. ring electrode N, 17. top board pressurizers, 601. hydraulic servo probes, 602. DC electrical method instrument optical cables, 603. stress acquisition probe, 604. inlet opening, 605. ring electrode wire A, 606. ring electrode wire M, 607. ring electrode wire N, 608. ring electrode wire B, 801. apopore, 802. water yield flowmeters.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1-Figure 3, rock sample electrical property feature proving installation under multi-scenarios method state, comprises resistivity measurement module, stress test module, seepage flow test module and upper and lower test probe 6,8;
Resistivity measurement module comprises electric method meter 1, ring electrode A13, ring electrode B14, ring electrode M15, ring electrode N16, insulation fixing plate 12, insulating protective layer 10, ring electrode wire A605, ring electrode wire B608, ring electrode wire M606, ring electrode wire N607 etc.As long as electric method meter 1 can adopt symmetrical four-stage device to measure rock sample resistivity.Ring electrode is connected to electric method meter 1 respectively by electric method meter optical cable 602.When measuring rock sample, electrode adopts ring electrode.Ring electrode copper wire, around core one week, is tightened on rock sample to be tested, is fully contacted with rock sample.Ring electrode, compared with ordinary electrode, has contact area many, easily fixes, the features such as convenient operation.The upper and lower end face of rock sample 9 to be tested is respectively arranged with insulating protective layer 10, rock sample 9 outer circumference surface to be tested is provided with insulation fixing plate 12; Insulation fixing plate 12 and insulating protective layer 10 Main Function prevent in rock sample 9 test process to be tested, and rock sample 9 to be tested is connected with other conductor, causes resistivity measurement error.Insulating protective layer stays the space of probe shape at upper and lower test probe 6,8 place, be convenient to probe and contact with rock sample 9 to be tested.
Stress test module is made up of hydraulic servo control system 2, hydraulic servo probe 601, stress acquisition system 4, side direction pressurizer 3, side direction fixed head 11, stress acquisition probe 603, top board pressurizer 17, base platform 7 etc.Wherein hydraulic servo control system 2 hydraulic control servo probe 601, be positioned at top board pressurizer 17 and the side direction pressurizer 3 of rock sample top to be tested and side, with top board pressurizer 17 and side direction pressurizer 3 acting in conjunction, realize applying different stress to rock sample to be tested, the STRESS VARIATION received by stress acquisition system 4 pairs of rocks, strain carry out data acquisition, Cheng Tu etc.Described side direction pressurizer 3 is connected with the side direction fixed head 11 abutting against described insulation fixing plate 12 outside.
Rock sample 9 to be tested and side direction pressurizer 3 are all arranged on base platform 7.Top board pressurizer 17 and side direction pressurizer 3 are hydraulic jack.
Stress acquisition system 4 is connected with the stress acquisition probe in upper test probe by wire.Seepage flow test module comprises water under high pressure water inlet system 5, and high-pressure water inlet system 5 is communicated with the inlet opening 604 in upper test probe 6, is provided with apopore 801, is provided with water yield flowmeter 802 in apopore 801 in lower test probe 8.High-pressure water inlet system 5, by water timing by inlet opening 604 enters in rock sample to be tested, by water yield flowmeter 802 metered flow in apopore 801, calculates the seepage flow value of rock sample.
Upper test probe 6 comprises the hydraulic servo probe 601 be arranged in probing shell, electric method meter optical cable 602, stress acquisition probe 603 and inlet opening 604, hydraulic servo probe 601 is connected with hydraulic servo control system 2, and described hydraulic servo probe 601 all contacts with rock sample 9 to be tested with stress acquisition probe 603.
Lower test probe 8 comprises housing, arranges the apopore 801 of a up/down perforation, arrange water yield flowmeter 802 in apopore 801 in housing, and case top apopore 801 upper port place is pit shape.
Upper and lower test probe 6,8 requires that resistance to compression insulating material is made, and matrix is made at lower test probe 801 top, is convenient to water and can flows into lower test probe 8 smoothly.
The core that rock sample mainly takes out from down-hole drilling, core is unsuitable oversize, and cross-sectional area should not be too large, and core takes out from boring that not easily to put into the outdoor time oversize, prevents core too dry, not easy conductive, causes electrical instrument to open a way.
Utilize the method for testing of rock sample electrical property feature proving installation under multi-scenarios method state, comprising:
(1) each model calling work
First the core of identical lithology is made same many parts, ensure that each rock sample length to be tested is identical, upper lower section is smooth simultaneously, and upper and lower test probe 6,8 fully contacts with rock sample 9 to be tested; With copper wire around rock sample one week, the ring electrode made also is fixed, and makes ring electrode contact intact with rock sample 9 to be tested, prevents electrodes of A, B from opening a way; Before rock sample 9 to be tested is placed on base platform 7, first insulating protective layer 10 is placed on respectively the upper bottom surface of rock sample 9 to be tested, leave the space of probe shape at upper and lower test probe 6,9 place, be convenient to upper and lower test probe 6,9 and contact with rock sample 9 to be tested; Rock sample 9 to be tested is connected with ring electrode, again ring electrode wire (comprising ring electrode wire A605, ring electrode wire B608, ring electrode wire M606, ring electrode wire N607) is linked together to ring electrode respectively with separately, again the resistivity optical cable in all ring electrode wires and upper probe is connected, resistivity main frame is connected with optical cable; Finally, utilize insulating protective layer 10 to be isolated with side direction fixed head 11 and side direction pressurizer 3 by rock sample 9 to be tested, prevent rock sample to be tested and other conductor contact, cause measurement result to occur error.
Secondly hydraulic servo control system and hydraulic pressure to be popped one's head in and stress test system and top board and side direction pressurizer connect, complete stress test model calling complete, be convenient to stress collection;
Finally, the apopore 801 in the inlet opening 604 in high-pressure water inlet system 5, upper test probe 6, the lower probe 8 of test and water yield flowmeter 802 are connected, completes seepage flow test module and connect, be convenient to seepage flow and measure; After each model calling completes, by airtight for rock sample to be tested, detect airtight intact after, can Test Data Collecting be carried out;
(2) single-factor variable data acquisition
A) electrical property feature under stress state
First when not adding stress, opening electric method meter, adopting symmetrical quadrupole device, according to the ring electrode position of binding, setting acquisition parameter, starts to test rock sample resistivity value, subsequently, open stress test module, by hydraulic control servo-control system hydraulic control servo probe and top or the acting in conjunction of side direction pressurizer, pressurize, along with the change of pressure constantly to rock sample to be tested, record rock sample change in resistance feature and rock fracture developmental state, until rock sample to be tested breaks; After rock sample to be tested breaks, then by stress test module, constantly give rock sample release to be tested, again observe rock sample change in resistance situation to be tested;
B) electrical property feature under seepage state
First when not adding seepage flow, open electric method meter, adopt symmetrical quadrupole device, according to the ring electrode position of binding, setting acquisition parameter, start to test rock sample resistivity value to be tested, subsequently, open seepage flow test module, intake from upper probe inlet opening by high-pressure water inlet system, the change of the test lower probe apopore water yield, according to the measure of the change seepage flow size of time and flow, measure rock sample change in resistance situation to be tested simultaneously, then constantly regulate the change of seepage flow, record rock sample resistivity value to be tested;
(3) multi-scenarios method data acquisition
A) before rock sample fragmentation to be tested, stress-seepage flow increases simultaneously, rock sample electrical property feature to be tested; Stress after rock sample fragmentation to be tested-seepage flow rock sample electrical property feature;
Open stress test module and seepage flow test module, increase stress and seepage flow simultaneously, record rock sample change in resistance feature to be tested and rock fracture developmental state, until rock sample to be tested breaks; After rock sample to be tested breaks, point three kinds of situation observations, one is that seepage flow is constant, constantly gives rock sample release to be tested, again observes rock sample Resistivity Characteristics to be tested; Two is increase seepage flow, reduces stress, observes rock sample change in resistance feature to be tested; Three is reduce seepage flow, reduces stress, observes rock sample change in resistance feature to be tested;
B) before rock sample fragmentation to be tested, stress increases, and seepage flow reduces, rock sample electrical property feature; Stress after rock sample fragmentation to be tested-seepage flow rock sample electrical property feature;
Open stress test module and seepage flow test module, increase stress, reduce seepage flow, record rock sample change in resistance feature to be tested and rock fracture developmental state, until rock sample breaks; After rock sample to be tested breaks, point three kinds of situation observations, one is that seepage flow is constant, constantly gives rock sample release to be tested, again observes rock sample Resistivity Characteristics to be tested; Two is increase seepage flow, reduces stress, observes rock sample change in resistance feature to be tested; Three is reduce seepage flow, reduces stress, observes rock sample change in resistance feature to be tested;
C) before rock sample fragmentation to be tested, stress reduces, and seepage flow increases, rock sample electrical property feature
Open stress test module and seepage flow test module, constantly reduce stress, increase seepage flow, record rock sample change in resistance feature and rock fracture developmental state.
(4) the base plate watery evolutionary model based on resistivity is set up
A) Changing Pattern between rock sample resistivity under stress and the single influence factor of seepage flow is analyzed.
B) Changing Pattern under stress-many, seepage flow state between rock sample resistivity is analyzed.
C) according to analyzing above, in conjunction with influence factor conditions such as rock lithology, the property of water-bearing, destructivenesses, the classification of rich regimen condition is carried out to rock resistivity, determine resistivity index and the parameter of rock watery partition of the level, for the occurrence status and migration rule accurately detecting floor undulation regimen lays the foundation.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. rock sample electrical property feature proving installation under multi-scenarios method state, is characterized in that, comprises resistivity measurement module, stress test module, seepage flow test module and upper and lower test probe;
Described resistivity measurement module comprises electric method meter and the ring electrode of four layered windings on rock sample to be tested, four ring electrodes are connected at upper test probe place with electric method meter optical cable respectively by ring electrode wire, are connected to electric method meter through electrical instrument optical cable; The upper and lower end face of rock sample to be tested is respectively arranged with insulating protective layer, and in insulating protective layer, is respectively arranged with the space stretched into for upper and lower test probe, rock sample outer circumference surface to be tested is provided with insulation fixing plate;
Described stress test module comprises the pressue device for pressurizeing to rock sample top to be tested and side and the stress harvester for gathering rock sample STRESS VARIATION to be tested;
Described seepage flow test module comprises water under high pressure water inlet system, and high-pressure water inlet system is communicated with the inlet opening in upper test probe, is provided with apopore, is provided with water yield flowmeter in apopore in lower test probe.
2. rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 1, it is characterized in that, described pressue device comprises hydraulic servo control system, hydraulic servo control system controls the top board pressurizer and the side direction pressurizer that are positioned at rock sample top to be tested and side respectively, and described side direction pressurizer is connected with the side direction fixed head abutting against described insulation fixing plate outside.
3. rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 2, it is characterized in that, described rock sample to be tested and side direction pressurizer are all arranged on base platform.
4. rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 2, it is characterized in that, described top board pressurizer and side direction pressurizer are hydraulic jack.
5. rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 1, it is characterized in that, described stress harvester comprises stress acquisition system, and stress acquisition system is connected with the stress acquisition probe in upper test probe by wire.
6. rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 1, it is characterized in that, described upper test probe comprises the hydraulic servo probe be arranged in probing shell, electric method meter optical cable, stress acquisition probe and inlet opening, hydraulic servo probe is connected with hydraulic servo control system, and described hydraulic servo probe all contacts with rock sample to be tested with stress acquisition probe.
7. rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 1, it is characterized in that, described lower test probe comprises housing, arranges the apopore of a up/down perforation in housing, arrange water yield flowmeter in apopore, case top apopore upper port place is pit shape.
8. utilize the method for testing of rock sample electrical property feature proving installation under multi-scenarios method state, it is characterized in that, comprising:
(1) each model calling work of proving installation
First the core of identical lithology is made same many parts, ensure that each rock sample length to be tested is identical, upper lower section is smooth, and upper and lower test probe fully contacts with rock sample to be tested simultaneously; With copper wire around rock sample to be tested a week, make ring electrode, and be fixed, make ring electrode contact intact with rock sample to be tested; Before rock sample to be tested is placed on base platform, first insulating protective layer is placed on respectively the upper bottom surface of rock sample to be tested, leaves the space of probe shape at upper and lower test probe place, be convenient to upper and lower test probe and contact with rock sample to be tested; Rock sample and ring electrode are connected, then ring electrode wire is linked together with each self-corresponding ring electrode respectively, then the resistivity optical cable in all ring electrode wires and upper probe is connected, resistivity main frame is connected with optical cable; Rock sample to be tested and side direction fixed head and pressurizer are isolated by recycling insulating protective layer, prevent rock sample to be tested and other conductor contact, cause measurement result to occur error;
Secondly, hydraulic servo control system and hydraulic pressure to be popped one's head in and stress test system and top board and side direction pressurizer connect, complete stress test model calling complete, be convenient to stress collection;
Finally, the apopore in the inlet opening in high-pressure water inlet system, upper test probe, the lower probe of test and water yield flowmeter are connected, completes seepage flow test module and connect, be convenient to seepage flow and measure; After each model calling completes, by airtight for rock sample to be tested, detect airtight intact after, can Test Data Collecting be carried out;
(2) single-factor variable data acquisition
A) electrical property feature under stress state
B) electrical property feature under seepage state
(3) multi-scenarios method data acquisition
A) before rock sample fragmentation to be tested, stress-seepage flow increases simultaneously, rock sample electrical property feature to be tested; Stress after rock sample fragmentation to be tested-seepage flow rock sample electrical property feature;
Open stress test module and seepage flow test module, increase stress and seepage flow simultaneously, record rock sample change in resistance feature to be tested and rock fracture developmental state, until rock sample to be tested breaks; After rock sample to be tested breaks, point three kinds of situation observations, one is that seepage flow is constant, constantly gives rock sample release to be tested, again observes rock sample Resistivity Characteristics to be tested; Two is increase seepage flow, reduces stress, observes rock sample change in resistance feature to be tested; Three is reduce seepage flow, reduces stress, observes rock sample change in resistance feature to be tested;
B) before rock sample fragmentation to be tested, stress increases, and seepage flow reduces, rock sample electrical property feature; Stress after rock sample fragmentation to be tested-seepage flow rock sample electrical property feature;
Open stress test module and seepage flow test module, increase stress, reduce seepage flow, record rock sample change in resistance feature to be tested and rock fracture developmental state, until rock sample breaks; After rock sample to be tested breaks, point three kinds of situation observations, one is that seepage flow is constant, constantly gives rock sample release to be tested, again observes rock sample Resistivity Characteristics to be tested; Two is increase seepage flow, reduces stress, observes rock sample change in resistance feature to be tested; Three is reduce seepage flow, reduces stress, observes rock sample change in resistance feature to be tested;
C) before rock sample fragmentation to be tested, stress reduces, and seepage flow increases, rock sample electrical property feature
Open stress test module and seepage flow test module, constantly reduce stress, increase seepage flow, record rock sample change in resistance feature and rock fracture developmental state;
(4) the base plate watery evolutionary model based on resistivity is set up
Analyze the Changing Pattern between rock sample resistivity under stress and the single influence factor of seepage flow;
Analyze the Changing Pattern under stress-many, seepage flow state between rock sample resistivity;
C) according to analyzing above, in conjunction with influence factor conditions such as rock lithology, the property of water-bearing, destructivenesses, the classification of rich regimen condition is carried out to rock resistivity, determine resistivity index and the parameter of rock watery partition of the level, for the occurrence status and migration rule accurately detecting floor undulation regimen lays the foundation.
9. utilize the method for testing of rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 8, it is characterized in that, under described stress state, electrical property feature is: first when not adding stress, open electric method meter, adopt symmetrical quadrupole device, according to the ring electrode position of binding, setting acquisition parameter, start to test rock sample resistivity value, subsequently, open stress test module, by hydraulic control servo-control system hydraulic control servo probe and top or the acting in conjunction of side direction pressurizer, constantly give rock sample to be tested pressurization, along with the change of pressure, record rock sample change in resistance feature and rock fracture developmental state, until rock sample to be tested breaks, after rock sample to be tested breaks, then by stress test module, constantly give rock sample release to be tested, again observe rock sample change in resistance situation to be tested.
10. utilize the method for testing of rock sample electrical property feature proving installation under multi-scenarios method state as claimed in claim 8, it is characterized in that, under described seepage state, electrical property feature is: first when not adding seepage flow, open electric method meter, adopt symmetrical quadrupole device, according to the ring electrode position of binding, setting acquisition parameter, start to test rock sample resistivity value to be tested, subsequently, open seepage flow test module, intake from upper probe inlet opening by high-pressure water inlet system, the change of the test lower probe apopore water yield, according to the measure of the change seepage flow size of time and flow, measure rock sample change in resistance situation to be tested simultaneously, then the change of seepage flow is constantly regulated, record rock sample resistivity value to be tested.
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