CN105928859A - Device and method for testing rock fracture seepage parameters under high temperature and high pressure conditions - Google Patents

Device and method for testing rock fracture seepage parameters under high temperature and high pressure conditions Download PDF

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Publication number
CN105928859A
CN105928859A CN201610537651.3A CN201610537651A CN105928859A CN 105928859 A CN105928859 A CN 105928859A CN 201610537651 A CN201610537651 A CN 201610537651A CN 105928859 A CN105928859 A CN 105928859A
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China
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sample
head
pressure
push
seaming chuck
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CN201610537651.3A
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Chinese (zh)
Inventor
骆进
谭龙
魏显贵
朱明成
张灿海
郭清海
项伟
庄亚芹
周超
朱永强
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中国地质大学(武汉)
黄河上游水电开发有限责任公司
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Priority to CN201610537651.3A priority Critical patent/CN105928859A/en
Publication of CN105928859A publication Critical patent/CN105928859A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/20Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity

Abstract

The invention provides a device for testing rock fracture seepage parameters under high temperature and high pressure conditions. The device at least comprises a tester framework, wherein a tester three-axis cylinder and a pressure head system are mounted in the tester framework, the pressure head system comprises an upper pressure head and a lower pressure head, and cylindrical samples are placed between the upper pressure head and the lower pressure head; the upper pressure head and the lower pressure head are mounted on the tester three-axis cylinder and are driven by the tester three-axis cylinder to pressurize the samples; a seepage water inlet is formed in the lower pressure head, a seepage water inlet pipe is arranged on the lower pressure head, a seepage water outlet is formed in the upper pressure head, and a seepage water outlet pipe is arranged on the upper pressure head; and an oil delivery pipe is connected to the tester three-axis cylinder, the other ends of the seepage water inlet pipe and the seepage water outlet pipe are connected with a seepage control system, and the other end of the oil delivery pipe is connected to a confining pressure control system. According to the device and the method, deficiencies in the prior art are solved, a seepage test under the high temperature and high pressure conditions can be realized, and the heat exchange efficiency in the seepage test can be tested. The device and the method have important significances to terrestrial heat exploitation.

Description

Rock fracture seepage parameters test device and method under a kind of high-temperature and high-pressure conditions

Technical field

The invention provides a kind of device and method for testing rock fracture seepage parameters, particularly relate to a kind of for Subterranean body infiltration coefficient under the conditions of specified temp, confined pressure and the isoparametric dress of permeability is tested under high-temperature and high-pressure conditions Put, belong to machinery technical field.

Background technology

Geothermal energy resources are a kind of typical clean energy resourcies, also referred to as " green energy resource " and " the renewable energy energy ", have huge Big value.Enhancement mode geothermal system (EGS), by injecting cold water, utilizes underground deep layer temperature near constant Characteristic, makes temperature of cold water rises, and it is extracted out from underground, thus obtain high-temperature water or steam, in order to generate electricity.Underground rock Heat exchange efficiency in the penetration property of body and flow event is the key factor of the efficiency determining geothermal energy resources utilization, the most also It it is the important parameter that relied on of enhancement mode geothermal system detail design.

In enhancement mode geothermal system detail design, if the fracture seepage characteristic of rock is understood insufficient, then can not be true The optimal seepage plan of depthkeeping layer crack rock, is carried out during hydrofracturing hydraulic pressure under certain depth specified temp And the selection of proppant will lack foundation, construction will be difficult to.Heat exchange efficiency in flow event is then direct relation To the economical and practical problem of enhancement mode geothermal system exploitation, during enhancement mode geothermal system is runed, if not knowing about infiltration Characteristic, can mistake estimate crack rock penetration property, have a strong impact on underground heat exploitation efficiency, may cause engineering generate electricity institute The creation of value is far smaller than early investment and the maintenance cost day after tomorrow.Hydrofracturing is the early stage work of enhancement mode geothermal system construction Make, it is necessary to be fully understood by this region and contain fissure rock seepage characteristic under the High Temperature High Pressure of local environment and heat exchange efficiency, Just can carry out the design work constructed, seepage characteristic is included in the infiltration coefficient under specified temp, confined pressure and permeability, enters One step analyzes heat exchange efficiency.

Existing rock fracture seepage parameters characteristic test method the most all uses the Brazilian split the law of improvement manually to manufacture Crack, is carried out seepage characteristic test the most again, is carried out the calculating of permeability parameters by Darcy's law under low-pressure state, and Do not test the relevant apparatus of heat exchange efficiency in flow event.

It is inadequate for the most only carrying out testing under low voltage situations.In the engineerings such as deep earth heart exploitation, need Under high confining pressure state, crack rock is injected cold water and carry out artificial seepage flow, and extract hot water, thus obtain geothermal energy resources. It is thus desirable to the fissure permeability matter of the High temperature rocks in deep is studied.And current instrument once carries out High Temperature High Pressure Under permeability test, the sealing of instrument will be destroyed.Heat exchange effect in enhancement mode geothermal system, in flow event Rate is the most key factor, and current instrument does not has relevant apparatus, it is impossible to test relevant parameter.

Existing rock fracture seepage characteristic test Patents mainly has: China Mining University's development " it is contemplated that multifactor The rock fill crack permeability method of testing of impact and device " patent No. CN105403498A;University Of Science and Technology Of Hunan grinds " test method produced with seepage apparatus and seepage characteristic of a kind of rock fracture " patent No. CN105388098A of system; " a kind of crack shearing-seepage coupling test system being applicable to triaxial cell and the test method " that Wuhan University develops Patent No. CN105203411A;Xi'an Technology University develop " one adds coal measure strata fracture seepage mould under unloading condition Intend assay device and method " patent No. CN104458534A;" a kind of Fracture Networks rock that Beijing University of Technology develops Shear-seepage coupling experiment method " patent No. CN103954511A;" the visible multifunctional that China Mining University develops Fracture seepage simulation test bench " patent No. CN101871876A;Wuhan Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences develops " seepage test device for rock crack " patent No. CN1425906A etc..

Above patent of invention major part is only applicable to low-pressure state, it is impossible to realize realizing crack under conditions of High Temperature High Pressure Accurate control, and the most do not test the means of heat exchange efficiency.And China Mining University " it is contemplated that multifactor impact Rock fill crack permeability method of testing and device " be only applicable to the test of the fracture seepage containing charges, it is impossible to The penetration property of unfilling fracture is tested.

Summary of the invention

The present invention solves deficiency of the prior art, wants for the permeability test under the High Temperature High Pressure of enhancement mode geothermal system Ask, MTS rock mechanics experiment machine improved, so have developed one meet carry out under High Temperature High Pressure infiltration examination Test and can test the device and method of heat exchange efficiency in flow event, underground heat exploitation is had great significance.

Realizing the technical scheme that above-mentioned purpose of the present invention used is:

Under a kind of high-temperature and high-pressure conditions, rock fracture seepage parameters test device, at least includes testing machine framework, described test Being provided with testing machine three axle cylinder and pressurized head systems in machine frame, pressurized head systems is made up of seaming chuck and push-down head, cylindrical Sample be positioned between seaming chuck and push-down head, the junction of seaming chuck, push-down head and sample latex film seals, sample Using transparent adhesive tape to be fixed with the sheet metal for resisting confined pressure at the crack of product, the outer wrap of sample has heat-shrink tube, pyrocondensation The two ends of pipe are respectively fitted on seaming chuck and push-down head, and two ends all use insulating tape to seal;

Described seaming chuck and push-down head are installed on testing machine three axle cylinder and press sample under it drives;Described push-down head On be provided with seepage flow blasthole, seaming chuck is provided with seepage flow water outlet hole, on seepage flow blasthole connect penetrate into water pipe, Connecting on seepage flow water outlet hole and penetrate water pipe, testing machine three axle cylinder connects petroleum pipeline, described in penetrate into water pipe, ooze The other end appearing water pipe is all connected with osmotic pressure control system, and the other end of petroleum pipeline is connected with confined pressure control system, described Osmotic pressure control system by penetrate into water pipe and penetrate water pipe control the upper and lower two ends of sample hydraulic pressure, formed osmotic pressure Difference;Described confined pressure control system passes through the petroleum pipeline Control experiment machine three axle cylinder applying pressure to sample;

Described penetrating into water pipe and penetrate and be provided with temperature measurer on water pipe, temperature measurer processes note by data wire with data Recording system connects, and described data handling recording system includes computer and display, and data handling recording system is also by number It is connected with osmotic pressure control system and confined pressure control system according to line.

Being additionally provided with sample splitting device, described sample splitting device includes spherical contact member, plinth and arc Splitting pressure head, plinth and arc splitting pressure head are provided with upper and lower two, and upper and lower two arcs splitting pressure head is the most solid In upper and lower two plinths, and the arc indent opening of upper and lower two arcs splitting pressure head is relative, and sample is fixed on Upper and lower two arc indent opening parts, spherical contact member is positioned at the top of plinth.

A diameter of 50mm of described sample, the height of sample is 100mm.

Present invention also offers a kind of rock fracture seepage parameters method of testing based on said apparatus, comprise the following steps: (1), making the rock sample sample containing crack according to test requirements document by sample splitting device, manufacture one is through in the sample The crack of diameter;

(2), by sample setup between seaming chuck and push-down head, and use in the junction of seaming chuck, push-down head and sample Latex film seals, and fixes sheet metal with transparent adhesive tape, be used for resisting confined pressure at the crack of sample, prevents outside heat-shrink tube from breaking Split;Then wrap sample with heat-shrink tube, and on the seaming chuck and push-down head at upper and lower two ends, respectively reserve one section of heat-shrink tube To seal;After being heated by heat-shrink tube by hot hair dryer, it is enclosed within the connection of seaming chuck, push-down head and sample with sealing ring Place seals further;Finally the two ends insulating tape at heat-shrink tube seals;

(3) sample and seaming chuck, push-down head after, sealing are placed on testing machine three axle cylinder, and according to infiltration Test requirements document is installed and is penetrated into water pipe and penetrate water pipe, petroleum pipeline;Close testing machine three axle cylinder, and controlled by confined pressure System injects oil in three axle cylinders, and adds confined pressure to the oil in three axle cylinders;

(4), opened the water route of seaming chuck and push-down head by osmotic pressure control system, and plus initial head, close sample The water route of lower end, pins the head of lower end, then reduces the head of sample upper end to predetermined value;Open seepage flow switch, carry out Permeability test;With infra-red thermometer, intake-outlet temperature is measured in permeability test is carried out;

(5), derive Various types of data, process, be calculated permeability parameters and heat transfer rate.

The present invention proposes a kind of device tested rock fracture seepage flow and heat exchange efficiency at high temperature under high pressure and side Method.It solve and prior art cannot be tested the permeability parameters of crack rock and asking of heat exchange efficiency at high temperature under high pressure Topic.This method, by the method installing the sheet metal of two panels high intensity at sample crack additional, is resisted confined pressure, is prevented heat-shrink tube Rupture, it is ensured that sealing intact.And the method steel plates such as latex film, sealing ring, insulating tape are used at sealing part, Ensure that confined pressure and osmotic pressure are not revealed, and use thermometer heat exchanging efficiency to survey at the import and export water pipe of osmosis system Examination.Compared with prior art, the invention have the advantages that 1, the present invention is to analyze rock fracture seepage characteristic to provide Experimental Method in Laboratory reliably, provides for enhancement mode geothermal system detail design and tests support reliably;2. quantification is provided Rock permeability parameters and means of heat exchange efficiency in fracture seepage under assay high-temperature and high-pressure conditions.3. method of testing essence The most careful, data are accurate.

Accompanying drawing explanation

The structural representation of the rock fracture seepage parameters test device that Fig. 1 provides for the present invention;

Fig. 2 is the structural representation of sample splitting device;

Fig. 3 is the structural representation of arc splitting pressure head;

Fig. 4 is sample and seaming chuck, the structural representation of push-down head;

In figure: 1-data handling recording system, 2-osmotic pressure control system, 3-confined pressure control system, 4-testing machine framework, 5-testing machine three axle cylinder, 6-sample, 7-seaming chuck, 8-penetrates into water pipe, and 9-penetrates water pipe, 10-petroleum pipeline, 11- Push-down head, 12-seepage flow blasthole, 13-seepage flow water outlet hole, 14-spherical contact member, 15-plinth, 16-arc Splitting pressure head.

Detailed description of the invention

Below in conjunction with the accompanying drawings and the present invention is done detailed specific description by specific embodiment, but protection scope of the present invention is also It is not limited to following example.

The structure of the rock fracture seepage parameters test device that the present embodiment provides is as it is shown in figure 1, at least include testing machine frame Frame 4, is provided with testing machine three axle cylinder 5 and pressurized head systems in described testing machine framework 4, pressurized head systems is by seaming chuck 7 He Push-down head 11 forms, and cylindrical sample 6 is positioned between seaming chuck 7 and push-down head 11, its structure such as Fig. 4 institute Show.Seaming chuck, push-down head seal with latex film with the junction of sample, use transparent adhesive tape to be fixed with use at the crack of sample In opposing confined pressure sheet metal, the outer wrap of sample has heat-shrink tube, the two ends of heat-shrink tube be respectively fitted over seaming chuck and under press On head, and two ends all use insulating tape to seal.

Described seaming chuck 7 and push-down head 11 are installed on testing machine three axle cylinder 5 and press sample under it drives;Institute State and on push-down head 11, be provided with seepage flow blasthole 12, seaming chuck 7 is provided with seepage flow water outlet hole 13, seepage flow blasthole 12 Upper connection penetrates into water pipe 8, seepage flow water outlet hole 13 connects and penetrates water pipe 9, testing machine three axle cylinder 5 connects Have petroleum pipeline 10, described in penetrate into water pipe 8, the other end that penetrates water pipe 9 is all connected with osmotic pressure control system 2, defeated The other end of oil pipe 10 is connected with confined pressure control system 3, and described osmotic pressure control system is by penetrating into water pipe and infiltration Outlet pipe controls the hydraulic pressure at the upper and lower two ends of sample, forms permeable pressure head;Described confined pressure control system is controlled by petroleum pipeline The testing machine three axle cylinder applying pressure to sample.

Described penetrating into water pipe 8 and penetrate and be provided with temperature measurer on water pipe 9, temperature measurer is by data wire and data Reason record system 1 connects, and described data handling recording system 1 includes computer and display, data handling recording system 1 is connected with osmotic pressure control system 2 and confined pressure control system 3 also by data wire.

A diameter of 50mm of the sample 6 employed in the present embodiment, the height of sample is 100mm.The preparation of sample uses Sample splitting device, the structure of described sample splitting device is as in figure 2 it is shown, include spherical contact member 14, plinth 15 and arc splitting pressure head 16, plinth 15 and arc splitting pressure head 16 be provided with upper and lower two, up and down Two arcs splitting pressure heads 16 are both secured in upper and lower two plinths 15, structure such as Fig. 3 institute of arc splitting pressure head Showing, the arc indent opening of upper and lower two arcs splitting pressure head is relative, and sample is fixed on upper and lower two arc indent opening parts, Spherical contact member is positioned at the top of plinth.

The using method of rock fracture seepage parameters that the present embodiment is provided test device is as follows: (1), want according to test Ask and make the rock sample sample containing crack by sample splitting device, manufacture the crack of a through diameter in the sample;

(2), by sample setup between seaming chuck and push-down head, and use in the junction of seaming chuck, push-down head and sample Latex film seals, and fixes sheet metal with transparent adhesive tape, be used for resisting confined pressure at the crack of sample, prevents outside heat-shrink tube from breaking Split;Then wrap sample with heat-shrink tube, and on the seaming chuck and push-down head at upper and lower two ends, respectively reserve one section of heat-shrink tube To seal;After being heated by heat-shrink tube by hot hair dryer, it is enclosed within the connection of seaming chuck, push-down head and sample with sealing ring Place seals further;Finally the two ends insulating tape at heat-shrink tube seals;

(3) sample and seaming chuck, push-down head after, sealing are placed on testing machine three axle cylinder, and according to infiltration Test requirements document is installed and is penetrated into water pipe and penetrate water pipe, petroleum pipeline;Close testing machine three axle cylinder, and controlled by confined pressure System injects oil in three axle cylinders, and adds confined pressure to the oil in three axle cylinders;

(4), opened the water route of seaming chuck and push-down head by osmotic pressure control system, and plus initial head, close sample The water route of lower end, pins the head of lower end, then reduces the head of sample upper end to predetermined value;Open seepage flow switch, carry out Permeability test;With infra-red thermometer, intake-outlet temperature is measured in permeability test is carried out;

(5), derive Various types of data, process, be calculated permeability parameters and heat transfer rate.

Claims (4)

1. a rock fracture seepage parameters test device under high-temperature and high-pressure conditions, at least includes testing machine framework, and it is special Levy and be: described testing machine framework is provided with testing machine three axle cylinder and pressurized head systems, pressurized head systems by seaming chuck and under press Head composition, cylindrical sample is positioned between seaming chuck and push-down head, seaming chuck, push-down head and the junction of sample Seal with latex film, at the crack of sample, use transparent adhesive tape to be fixed with the sheet metal for resisting confined pressure, the outside bag of sample Being wrapped with heat-shrink tube, the two ends of heat-shrink tube are respectively fitted on seaming chuck and push-down head, and two ends all use insulating tape to seal;
Described seaming chuck and push-down head are installed on testing machine three axle cylinder and press sample under it drives;Described push-down head On be provided with seepage flow blasthole, seaming chuck is provided with seepage flow water outlet hole, on seepage flow blasthole connect penetrate into water pipe, Connecting on seepage flow water outlet hole and penetrate water pipe, testing machine three axle cylinder connects petroleum pipeline, described in penetrate into water pipe, ooze The other end appearing water pipe is all connected with osmotic pressure control system, and the other end of petroleum pipeline is connected with confined pressure control system, described Osmotic pressure control system by penetrate into water pipe and penetrate water pipe control the upper and lower two ends of sample hydraulic pressure, formed osmotic pressure Difference;Described confined pressure control system passes through the petroleum pipeline Control experiment machine three axle cylinder applying pressure to sample;
Described penetrating into water pipe and penetrate and be provided with temperature measurer on water pipe, temperature measurer processes note by data wire with data Recording system connects, and described data handling recording system includes computer and display, and data handling recording system is also by number It is connected with osmotic pressure control system and confined pressure control system according to line.
Rock fracture seepage parameters test device under high-temperature and high-pressure conditions the most according to claim 1, its feature exists In: being additionally provided with sample splitting device, described sample splitting device includes spherical contact member, plinth and arc Splitting pressure head, plinth and arc splitting pressure head are provided with upper and lower two, and upper and lower two arcs splitting pressure head is the most solid In upper and lower two plinths, and the arc indent opening of upper and lower two arcs splitting pressure head is relative, and sample is fixed on Upper and lower two arc indent opening parts, spherical contact member is positioned at the top of plinth.
Rock fracture seepage parameters test device under high-temperature and high-pressure conditions the most according to claim 2, its feature exists In: a diameter of 50mm of described sample, the height of sample is 100mm.
4. a rock fracture seepage parameters method of testing based on device described in claim 1, it is characterised in that include Following steps: (1), made containing the rock sample sample in crack by sample splitting device according to test requirements document, are made in the sample Make the crack of a through diameter;
(2), by sample setup between seaming chuck and push-down head, and use in the junction of seaming chuck, push-down head and sample Latex film seals, and fixes sheet metal with transparent adhesive tape, be used for resisting confined pressure at the crack of sample, prevents outside heat-shrink tube from breaking Split;Then wrap sample with heat-shrink tube, and on the seaming chuck and push-down head at upper and lower two ends, respectively reserve one section of heat-shrink tube To seal;After being heated by heat-shrink tube by hot hair dryer, it is enclosed within the connection of seaming chuck, push-down head and sample with sealing ring Place seals further;Finally the two ends insulating tape at heat-shrink tube seals;
(3) sample and seaming chuck, push-down head after, sealing are placed on testing machine three axle cylinder, and according to infiltration Test requirements document is installed and is penetrated into water pipe and penetrate water pipe, petroleum pipeline;Close testing machine three axle cylinder, and controlled by confined pressure System injects oil in three axle cylinders, and adds confined pressure to the oil in three axle cylinders;
(4), opened the water route of seaming chuck and push-down head by osmotic pressure control system, and plus initial head, close sample The water route of lower end, pins the head of lower end, then reduces the head of sample upper end to predetermined value;Open seepage flow switch, carry out Permeability test;With infra-red thermometer, intake-outlet temperature is measured in permeability test is carried out;
(5), derive Various types of data, process, be calculated permeability parameters and heat transfer rate.
CN201610537651.3A 2016-07-08 2016-07-08 Device and method for testing rock fracture seepage parameters under high temperature and high pressure conditions CN105928859A (en)

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CN106908365A (en) * 2017-01-23 2017-06-30 华北水利水电大学 One kind is adopted dynamic circuit breaker and splits rock cranny dynamically closure seepage simulation experimental rig and method
CN106908314A (en) * 2017-04-26 2017-06-30 中国石油大学(华东) Rock core thermic splits experimental system and method under a kind of hyperbaric environment
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CN106423311B (en) * 2016-10-09 2019-04-12 青岛科技大学 A kind of pressure type heating refrigeration high-low-temperature environmental testing case apparatus
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CN106908365A (en) * 2017-01-23 2017-06-30 华北水利水电大学 One kind is adopted dynamic circuit breaker and splits rock cranny dynamically closure seepage simulation experimental rig and method
CN106908365B (en) * 2017-01-23 2019-05-24 华北水利水电大学 One kind adopting dynamic circuit breaker and splits rock cranny dynamic closure seepage simulation experimental rig and method
CN106908314B (en) * 2017-04-26 2020-04-14 中国石油大学(华东) Rock core thermal cracking experiment system and method in high-pressure environment
CN106908314A (en) * 2017-04-26 2017-06-30 中国石油大学(华东) Rock core thermic splits experimental system and method under a kind of hyperbaric environment
CN108303310A (en) * 2018-02-07 2018-07-20 成都理工大学 Rock ordinary triaxial test test specimen sealing device and its application method
CN109211971A (en) * 2018-11-16 2019-01-15 中国矿业大学 The interface Shui Yan convection transfer rate measurement method in the sample seepage flow diabatic process of crack
CN109211971B (en) * 2018-11-16 2020-04-10 中国矿业大学 Method for measuring convective heat transfer coefficient of water-rock interface in seepage heat transfer process of fracture sample
CN111220523A (en) * 2020-01-10 2020-06-02 中国矿业大学 Geothermal exploitation test method under simulated complex load condition

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