CN103411870A - Experimental device for simulating dynamic destruction of stratum rocks - Google Patents
Experimental device for simulating dynamic destruction of stratum rocks Download PDFInfo
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- CN103411870A CN103411870A CN2013103342449A CN201310334244A CN103411870A CN 103411870 A CN103411870 A CN 103411870A CN 2013103342449 A CN2013103342449 A CN 2013103342449A CN 201310334244 A CN201310334244 A CN 201310334244A CN 103411870 A CN103411870 A CN 103411870A
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Abstract
The invention relates to an experimental device for simulating dynamic destruction of stratum rocks. The experimental device is characterized by comprising an experimental rock sample, a thick-walled steel cylinder, an upper piston, a lower piston, an upper cover plate and a lower cover plate, wherein the experimental rock sample is sleeved with a thick-walled steel cylinder; a sealing capsule is arranged between the experimental rock sample and the thick-walled steel cylinder; an annular hollow space is formed between the thick-walled steel cylinder and the sealing capsule; the upper cover plate and the lower cover plate are placed at the upper part and the lower part of the sealing capsule; a plurality of levelling bolts are arranged in mounting holes correspondingly formed in the upper cover plate, the lower plate and the thick-walled steel cylinder in a penetrating manner; the upper cover plate, the lower plate and the thick-walled steel cylinder are fixed into a whole through a plurality of nuts; a confining pressure exerting hole communicated with the annular hollow space between the thick-walled steel cylinder and the sealing capsule is formed in the thick-walled steel cylinder; dynamic load pressure holes used for placing a dynamic load exerting tool are formed in the center positions of the upper piston and the experimental rock sample in the axial direction; a dynamic load measuring pressure gauge used for measuring the dynamic load value of a center inner wall hole of the experimental rock sample is arranged at the lower cover plate. The experimental device can be used as a dynamic destruction experimental device in the experimental process for simulating dynamic destruction of stratum rocks.
Description
Technical field
The present invention relates to a kind of dynamic failure test unit, particularly about a kind of simulated formation rock dynamic failure test unit.
Background technology
Main waterfrac treatment and the Acidizing Technology of adopting transformed oil reservoir in the exploitation in low-permeability oil gas field at present.But in the very low hydrocarbon-bearing pool of permeability, only at the major fracture neighborhood oil gas that waterfrac treatment forms, can flow into the major fracture output by original micro-pore in rock, away from major fracture still difficult extraction of oil gas far away, effectively improving low-permeability oil gas field recovery ratio is the major issue that the exploitation of low-permeability oil gas field faces.No matter be the conventional measure of LOW PERMEABILITY OILFIELD DEVELOPMENT, still develop the Physical oil recovery measure in low-permeability oil gas field, it is exactly the destruction case study of rock in the dynamic load situation that a very crucial problem is arranged, and is also a core key issue of carrying out pressing crack construction.The Physical oil recovery mechanism of action be exactly Dynamic Loading on oil reservoir, improve reservoir permeability, thereby improve the increasing yield and injection effect.The destruction case study of rock in the dynamic load situation is of great significance for LOW PERMEABILITY OILFIELD DEVELOPMENT.Yet how the destruction situation in the dynamic load situation is estimated to rock, sets up a set of applicable simulation test device and evaluation means by most important.
Through the literature search to prior art, find, be used to measuring Dynamic properties of rock, mostly adopt SPHB(Split Hopkinson Pressure Bar both at home and abroad at present, split hopkinson bar) device, this device mostly is the uniaxial compression state, although a few countries has adopted three axle SHPB devices, confined pressure and impact velocity are also very low.Along with mining, the petroleum industry mining depth progressively deepens, the mechanical characteristics of prediction deep perforation, demolition effect and the dynamic stress field surrounding rock body that produces therefrom just becomes problem demanding prompt solution.This device is used more in Geotechnical Engineering, but in petroleum engineering, and due to the restriction of rock size and the shortcoming such as the true stressing conditions simulated conditions of subterranean strata are limited, this device can not meet the experimental study requirement of the dynamic stratum rock failure mechanism of rock fully.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide a kind of can the simulated formation rock constant while enclosing to pressure and axle pressure dynamic loading destroy the simulated formation rock dynamic failure test unit of situation.
For achieving the above object, the present invention takes following technical scheme: a kind of simulated formation rock dynamic failure test unit is characterized in that: it comprises test rock sample, heavy wall steel cylinder, upper piston, lower piston, upper cover plate and lower cover; In described test, with the sheathed described heavy wall steel cylinder in rock sample outside, between described test is with rock sample and described heavy wall steel cylinder, be provided with a seal capsule, and have an annular space between described heavy wall steel cylinder and described seal capsule; On described seal capsule, place described upper cover plate, at described seal capsule lower surface, place described lower cover, some leveling bolts are located in the corresponding mounting hole arranged of described upper cover plate, described lower cover and described heavy wall steel cylinder, and by a plurality of nuts, described upper cover plate, described lower cover and described heavy wall steel cylinder are fixed into to one; On described heavy wall steel cylinder, be provided be communicated with annular space between described heavy wall steel cylinder and seal capsule apply the confined pressure hole; In described upper piston and test, axially be provided with one with the center of rock sample and be used to placing dynamic loading, apply the dynamic loading pressure port of instrument; Described lower cover place arranges one be used to measuring the dynamic loading gaging pressure meter of described test by the center inner wall hole dynamic loading value of rock sample.
Described test is with between rock sample top and described upper piston, a sealing gasket being set, and described test is with between rock sample bottom and described lower piston, another sealing gasket being set.
Described upper piston and described lower piston circumferentially are provided with some O RunddichtringOs.
The described confined pressure hole that applies comprises the oil hole axially arranged along described heavy wall steel cylinder, and the injecting hole radially arranged along described heavy wall steel cylinder.
The described confined pressure hole that applies is one, or is two that are arranged symmetrically with.
Described dynamic loading applies tool interior gunpowder is housed, and by controlling powder volume, and igniter head electric ignition detonates and make it detonation, discharges controlled dynamic loading.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention is owing to applying confined pressure hole one end connection one gas cylinder, therefore can apply as required certain gaseous tension, by the hydraulic oil between seal capsule and heavy wall steel cylinder, pressure is passed to the test rock sample, and then realize test is applied to constant enclosing to pressure with rock sample.2, the present invention can, by the bolt of Scale wrench adjusting test with heavy wall steel cylinder upper cover plate place, rock sample place, apply test rock sample constant axial.3, the present invention's dynamic load effect that can discharge by the dynamic loading compression tools applied on the dynamic loading pressure port is at test rock sample inner wall hole, and the dynamic loading gaging pressure meter of laying by the lower cover place, constant enclose to pressure and axle pressure, determine after, measure the dynamic loading situation, thereby rock dynamic loading destruction situation is assessed.4, the present invention can also remove the seal capsule of testing with around rock sample, by gas cylinder, exert pressure from applying the confined pressure hole, adopt gaseous tension with the rock sample outside, to carry out seepage flow to center pit to test, measuring center hole pressure changing, the anti-push out test permeability value of rock sample.Realize that this device does not need to change the situation of change that can measure the permeability of rock sample before and after dynamic loading applies, further estimates by the permeability variation situation rock sample destroys under dynamic loading situation.The present invention can be used as the dynamic failure test unit and is widely used in simulated formation rock dynamic failure process of the test.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 is inner structure schematic diagram of the present invention
Fig. 3 is rock sample equipment schematic diagram of the present invention
Fig. 4 is that the present invention applies the confined pressure structural representation
Fig. 5 is upper cover plate structural representation of the present invention
Fig. 6 is lower cover structural representation of the present invention
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1 and Figure 2, the present invention includes test rock sample 1, heavy wall steel cylinder 2, upper piston 3, lower piston 4, upper cover plate 5 and lower cover 6.
As shown in Figure 3, test is with being provided with a sealing gasket 7 between the top of rock sample 1 and upper piston 3, tests with between the bottom of rock sample 1 and lower piston 4, being provided with another sealing gasket 8.Upper piston 3 and lower piston 4 circumferentially be provided with some O RunddichtringOs 9.
As shown in Figure 2, there is axial round center hole (not shown) in test with rock sample 1 inside, in test, with the rock sample 1 sheathed heavy wall steel cylinder 2 in outside, be provided with a seal capsule 10 between test is with rock sample 1 and heavy wall steel cylinder 2, and have an annular space between heavy wall steel cylinder 2 and seal capsule 10.On seal capsule 10 tops, be provided with upper sealing ring 11, be provided with lower sealing ring 12 in seal capsule 10 bottoms.On upper sealing ring 11, place upper cover plate 5, on lower sealing ring 12, place lower cover 6, some leveling bolts 13 are located in upper cover plate 5, lower cover 6 and the corresponding mounting hole arranged of heavy wall steel cylinder 2, and by a plurality of nuts, upper and lower cover plate 5,6 and heavy wall steel cylinder 2 are fixed into to one.On heavy wall steel cylinder 2, be provided be communicated with annular space between heavy wall steel cylinder 2 and seal capsule 10 apply confined pressure hole 15, apply confined pressure hole 15 and comprise the oil hole axially arranged along heavy wall steel cylinder 2, and, along the injecting hole that heavy wall steel cylinder 2 radially arranges, be equipped with piston on oil hole and injecting hole.During use, at first the piston of oil hole is opened, closed plug after filling with hydraulic oil in the annular space between heavy wall steel cylinder 2 and seal capsule 10; Then the piston of injecting hole is opened, and be communicated with gas cylinder to applying the interior injection air in confined pressure hole 15, so that hydraulic oil is exerted pressure, and transfer the pressure to test rock sample 1 by seal capsule 10, thereby test is produced to certain enclosing to pressure with rock sample 1.Further adjust gas cylinder and apply pressure to steady state value, thereby realize constant confining pressure.Use Scale wrench to apply as required constant-torque to the bolt 14 on upper cover plate 5, realize test is applied to constant axle pressure with rock sample 1.
In a preferred embodiment, apply confined pressure hole 15 and also can be two, and two apply confined pressure hole 15 for being arranged symmetrically with.
Simultaneously, at upper piston 3 and test, axially be provided with a dynamic loading pressure port 16 with the center of rock sample 1.After constant axial and constant circumferential pressure are determined, at dynamic loading pressure port 16 places, place dynamic loading and apply instrument, this tool interior is equipped with gunpowder, by controlling powder volume, and igniter head electric ignition is detonated and is made it detonation, discharge controlled dynamic loading, this dynamic loading finally acts on test rock sample 1 inner hole wall, and place a dynamic loading gaging pressure meter (not shown) by lower cover 6 places, measure the center inner wall hole dynamic loading value of test with rock sample 1, and be transferred to computing machine and process.According to conversion gunpowder consumption repeatedly, record many group dynamic loading data, can carry out rock dynamic loading destruction situation is assessed.If remove seal capsule 10, use gas cylinder to apply gaseous tension by applying confined pressure hole 15, with rock sample 1 outside, carry out gas flow to center pit from test, place dynamic loading gaging pressure meter in lower cover 6 bottoms, measuring center hole pressure changing, the anti-push out test permeability value of rock sample 1.Can realize that so this device does not need to change the situation of change that can measure the permeability of rock sample before and after dynamic loading applies, further estimates by the permeability variation situation rock sample destroys under dynamic loading situation.
The various embodiments described above are only be used to illustrating the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (6)
1. simulated formation rock dynamic failure test unit is characterized in that: it comprises that test is with rock sample, heavy wall steel cylinder, upper piston, lower piston, upper cover plate and lower cover;
In described test, with the sheathed described heavy wall steel cylinder in rock sample outside, between described test is with rock sample and described heavy wall steel cylinder, be provided with a seal capsule, and have an annular space between described heavy wall steel cylinder and described seal capsule; On described seal capsule, place described upper cover plate, at described seal capsule lower surface, place described lower cover, some leveling bolts are located in the corresponding mounting hole arranged of described upper cover plate, described lower cover and described heavy wall steel cylinder, and by a plurality of nuts, described upper cover plate, described lower cover and described heavy wall steel cylinder are fixed into to one; On described heavy wall steel cylinder, be provided be communicated with annular space between described heavy wall steel cylinder and seal capsule apply the confined pressure hole; In described upper piston and test, axially be provided with one with the center of rock sample and be used to placing dynamic loading, apply the dynamic loading pressure port of instrument; Described lower cover place arranges one be used to measuring the dynamic loading gaging pressure meter of described test by the center inner wall hole dynamic loading value of rock sample.
2. a kind of simulated formation rock dynamic failure test unit according to claim 1, it is characterized in that: described test is with between rock sample top and described upper piston, a sealing gasket being set, and described test is with between rock sample bottom and described lower piston, another sealing gasket being set.
3. a kind of simulated formation rock dynamic failure test unit according to claim 1, it is characterized in that: described upper piston and described lower piston circumferentially are provided with some O RunddichtringOs.
4. according to claim 1 or 2 or 3 described a kind of simulated formation rock dynamic failure test units, it is characterized in that: the described confined pressure hole that applies comprises the oil hole axially arranged along described heavy wall steel cylinder, and the injecting hole radially arranged along described heavy wall steel cylinder.
5. a kind of simulated formation rock dynamic failure test unit according to claim 4, it is characterized in that: the described confined pressure hole that applies is one, or is two of being arranged symmetrically with.
6. according to claim 1 or 2 or 3 or 5 described a kind of simulated formation rock dynamic failure test units, it is characterized in that: described dynamic loading applies tool interior gunpowder is housed, by controlling powder volume, and igniter head electric ignition detonates and makes it detonation, discharges controlled dynamic loading.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390859A (en) * | 2014-11-18 | 2015-03-04 | 山东科技大学 | True triaxial simulation test device for three-directional rigid loading impact ground pressure |
| CN106353238A (en) * | 2016-10-31 | 2017-01-25 | 贵州大学 | Auxiliary device for permeability test of shale sample |
| CN106370335A (en) * | 2016-10-21 | 2017-02-01 | 洛阳理工学院 | Pressure box fixing device for measuring surrounding rock-lining contact pressure of rock |
| CN106644740A (en) * | 2017-02-22 | 2017-05-10 | 中国石油大学(北京) | Experimental device for testing fracture toughness of rocks under pore pressure condition |
| CN106769517A (en) * | 2017-02-22 | 2017-05-31 | 中国石油大学(北京) | The experimental technique of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure |
| CN108801799A (en) * | 2018-07-05 | 2018-11-13 | 中国地质大学（北京） | Rock fracture physical simulation system and test method |
| CN113654892A (en) * | 2021-08-31 | 2021-11-16 | 武汉大学 | Blasting dynamic response simulator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106525686B (en) * | 2016-10-31 | 2019-04-16 | 中国石油大学(华东) | A kind of customization pulsed rock fracture in dynamic indentation imitative experimental appliance and its experimental method |
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| CN203465174U (en) * | 2013-08-02 | 2014-03-05 | 中国海洋石油总公司 | Device for simulating dynamic fracture test of stratigraphic rocks |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390859A (en) * | 2014-11-18 | 2015-03-04 | 山东科技大学 | True triaxial simulation test device for three-directional rigid loading impact ground pressure |
| CN106370335A (en) * | 2016-10-21 | 2017-02-01 | 洛阳理工学院 | Pressure box fixing device for measuring surrounding rock-lining contact pressure of rock |
| CN106353238A (en) * | 2016-10-31 | 2017-01-25 | 贵州大学 | Auxiliary device for permeability test of shale sample |
| CN106644740A (en) * | 2017-02-22 | 2017-05-10 | 中国石油大学(北京) | Experimental device for testing fracture toughness of rocks under pore pressure condition |
| CN106769517A (en) * | 2017-02-22 | 2017-05-31 | 中国石油大学(北京) | The experimental technique of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure |
| CN106644740B (en) * | 2017-02-22 | 2019-04-19 | 中国石油大学(北京) | The experimental provision of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure |
| CN106769517B (en) * | 2017-02-22 | 2019-06-14 | 中国石油大学(北京) | The experimental method of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure |
| CN108801799A (en) * | 2018-07-05 | 2018-11-13 | 中国地质大学（北京） | Rock fracture physical simulation system and test method |
| CN113654892A (en) * | 2021-08-31 | 2021-11-16 | 武汉大学 | Blasting dynamic response simulator |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |