CN106226216B - A kind of core holding unit and its measurement method - Google Patents
A kind of core holding unit and its measurement method Download PDFInfo
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- CN106226216B CN106226216B CN201610537817.1A CN201610537817A CN106226216B CN 106226216 B CN106226216 B CN 106226216B CN 201610537817 A CN201610537817 A CN 201610537817A CN 106226216 B CN106226216 B CN 106226216B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
A kind of core holding unit and its measurement method, the core holding unit includes clamper cylinder, it is arranged in the intracorporal core sample of clamper cylinder, clamper cylinder is respectively adopted and is threadedly coupled with left end cap and hollow right end cap, right piston is set in the hollow cavity of hollow right end cap, right plug is set between right piston and hollow right end cap inner wall；Rubber bush is wrapped on the outside of the left half of the right half and right plug of core sample and left end cap；Cavity between clamper cylinder, core sample, left end cap and hollow right end cap forms pressure indoor；Confining pressure fluid inlet is provided on the downside of clamper cylinder, upside is provided with confining pressure fluid outlet；It is Experimental Flowing Object entrance that right plug, which is provided with through-hole, and left end cap is provided with through-hole as Experimental Flowing Object outlet；The invention also discloses measurement methods；It can be able to achieve the measurement of mechanics parameter and permeability in same device, conventional efficient can be greatly improved for needing while measuring the experiment of fatigue properties and permeability of rock sample.
Description
Technical field
The invention mainly relates to core permeability and its measuring devices of basic mechanical parameter, and in particular to a kind of rock core folder
Holder and its measurement method are a kind of core holding units that can measure mechanics parameter and permeability simultaneously.
Background technique
Permeability is one of essential attribute of material, is surveyed in the geology of geological exploration and development, especially oil and natural gas
The fields such as exploitation are visited and researched and produced, needs to take out related formation core from underground, carries out the experiment of rock core Physical Property Analysis, measure phase
The physical parameters such as permeability, intensity, the elasticity modulus of rock core are closed, provide reference for actual development.
The permeability of rock is very low, more generally uses transient pressure in the experimental method of current measurement low-permeability
Impulse method.It and is exactly core holding unit using being used to place the component of rock to be measured in the experimental provision of the program.Current rock
Heart clamp holder can only realize simple measurement core permeability or measure permeability under the conditions of certain constantly acting load, can not
The measurement of fatigue properties and permeability is realized in same device.
Summary of the invention
In order to overcome the above-mentioned problems of the prior art, the object of the present invention is to provide a kind of core holding unit and its surveys
Amount method can be able to achieve mechanics parameter (fatigue properties, compressive strength and elasticity modulus) and permeability in same device
Measurement can greatly improve conventional efficient for needing while measuring the experiment of fatigue properties and permeability of rock sample.
In order to reach the goals above, the present invention adopts the following technical scheme:
The core sample 15 in clamper cylinder 2, clamper is arranged in a kind of core holding unit, including clamper cylinder 2
Cylinder 2 is respectively adopted and is threadedly coupled with left end cap 1 and hollow right end cap 5, places porous pad between left end cap 1 and core sample 15
Piece 3, the hollow cavity of hollow right end cap 5 is interior to be arranged right piston 7, and right plug 6 is arranged between 5 inner wall of right piston 7 and hollow right end cap,
Right plug 6 is connect by screw thread with the inner wall of hollow right end cap 5, is placed between core sample 15 and right plug 6 and right piston 7 porous
Gasket 3；Rubber bush 4 is wrapped on the outside of the left half of the right half and right plug 6 of core sample 15 and left end cap 1；
Cavity between the clamper cylinder 2, core sample 5, left end cap 1 and hollow right end cap 5 forms pressure indoor 8；The clamper
The downside of cylinder 2 is provided with confining pressure fluid inlet 14, and upside is provided with confining pressure fluid outlet 13；It is real that the right plug 6, which is provided with through-hole,
Fluid inlet 11 is tested, it is Experimental Flowing Object outlet 12 that the left end cap 1, which is provided with through-hole,.
The left and right edges of the rubber bush 4 use 10 lock ring of iron wire cranse on left end cap 1 and right plug 6 respectively.
Between the left end cap 1 and clamper cylinder 2, between hollow right end cap 5 and clamper cylinder 2, right plug 6 and the hollow right side
The groove for placing sealing ring 9 is provided between end cap 5 and between right piston 7 and right plug 6.
The measurement method of core holding unit described above,
The core holding unit is for measuring core sample along the permeability in gripper axes direction: opening confining pressure fluid outlet
13, confining pressure fluid is injected to pressure indoor 8 by confining pressure fluid inlet 14, confining pressure stream is closed after confining pressure fluid fills pressure indoor 8
Confining pressure fluid inlet 14 is closed after the pressure of pressure indoor reaches the value that experiment needs in body outlet 13；Measure the reality of permeability
It tests fluid and flows into core sample 15 from Experimental Flowing Object entrance 11, from 12 outflow core sample 15 of Experimental Flowing Object outlet, pass through measurement
Pressure difference of the Experimental Flowing Object at the inflow end of core sample 15 and outflow end changes with time and can calculate permeability；It is added to enclose
Press the pressure values of fluid must be bigger than the pressure values of Experimental Flowing Object；The porous gasket 3 of 15 left and right sides of core sample is for guaranteeing
Experimental Flowing Object flows evenly through core sample；The depth that right plug 6 and right piston 7 are inserted into clamper cylinder 2 is adjustable to adapt to not
Same rock core height；If simultaneously in the left side of left end cap 1 and the right end of right piston 7 in the measurement process of above-mentioned permeability
Face, which applies load, can measure the permeability of the rock core under the effect of certain load；
The core holding unit is for measuring compression fatigue characteristic of the core sample under water environment: being similar to permeability first
Measurement process, be in core sample under water environment, fatigue load loads left side and right piston 7 in left end cap 1 respectively
Right side；By adjusting the amplitude of fatigue load, and the fatigue load periodicity that sample is loaded into needed for destroying is recorded, it can
Obtain S-N curve of sample under the conditions of compression fatigue i.e. S-N curve；Pass through crackle on sample after measurement fatigue loading
Length, density and crack tip opening displacement, and record corresponding fatigue load periodicity, can obtain fatigue load periodicity with
Length, the relationship of density and crack tip opening displacement of crackle, wherein the length, density of crackle use vernier caliper measurement, split point
Opening displacement is taken pictures measurement using scanning electron microscope；
The core holding unit is for measuring compressive strength and elasticity modulus of the core sample under water environment: being similar to first
The measurement process of permeability is in core sample under water environment, and single axis test machines compressive load is loaded respectively in left end cap 1
The right side of left side and right piston 7 can obtain core sample survey by the power and displacement in record experimental machine loading procedure
Start to be loaded into the curves of stress-strain relationship during final compression failure, the maximum stress on curve is exactly core sample
Compressive strength, can be derived that the elasticity modulus of core sample by the slope of a curve.
Compared to the prior art, the invention has the following advantages that
(1) fatigue properties and permeability survey are able to achieve in same device, for needing while measuring rock sample
The experiment of fatigue properties and permeability can greatly improve conventional efficient.
(2) height of core holding unit measurement core sample can change.
(3) core holding unit can measure strong under the permeability and water environment of rock core under the effect of certain load
The measurement of degree, elasticity modulus and fatigue properties.
(4) Experimental Flowing Object of core holding unit test permeability can be water or salt water.It is appropriate using being adjusted when salt water
The concentration of salt can be with simulated seawater environment.
Detailed description of the invention
Fig. 1 core holding unit structural schematic diagram of the present invention.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is described in further details.
As shown in Figure 1, a kind of core holding unit of the present invention, mainly includes clamper cylinder 2, left end cap 1, right end cap 5, the right side
Plug 6, right piston 7, porous gasket 3, rubber bush 4, pressure indoor 8, sealing ring 9, iron wire cranse 10, Experimental Flowing Object entrance 11,
Experimental Flowing Object outlet 12, confining pressure fluid inlet 14 and confining pressure fluid outlet 13.Clamper cylinder 1, left end cap 1, right end cap 5, the right side
Plug 6 and right piston 7 use stainless steel material.Experimental Flowing Object uses water, and confining pressure fluid uses poly- ammonia using oil, rubber bush 4
Ester, porous gasket use ZrC material.Clamper cylinder 2 is respectively adopted and is threadedly coupled with left end cap 1 and right end cap 5, left end cap 1
Porous gasket 3 is placed between core sample 15, is connected through a screw thread between right end cap 5 and right plug 6, core sample 15 and the right side
Porous gasket 3 is placed between plug 6 and right piston 7.In the left part of the right half and right plug of core sample 15 and left end cap
The outside divided is wrapped in rubber bush 4, uses 10 lock ring of iron wire cranse in left end cap and the right side respectively in the left and right edges of rubber bush 4
On plug.
The core holding unit is for measuring core sample along the permeability in gripper axes direction.Open confining pressure fluid outlet
13, confining pressure fluid is injected to pressure indoor 8 by confining pressure fluid inlet 14, confining pressure stream is closed after confining pressure fluid fills pressure indoor 8
Confining pressure fluid inlet 14 is closed after the pressure of pressure indoor reaches the value that experiment needs in body outlet 13.Measure the reality of permeability
It tests fluid and flows into core sample from Experimental Flowing Object entrance 11, from 12 outflow core sample of Experimental Flowing Object outlet, pass through measurement experiment
Pressure difference of the fluid at core sample inflow end and outflow end changes with time and can calculate permeability.Added confining pressure fluid
Pressure values must be bigger than the pressure values of Experimental Flowing Object.The porous gasket of 15 left and right sides of core sample is for guaranteeing Experimental Flowing Object
Flow evenly through core sample.The depth that right end cap 6 and right piston 7 are inserted into clamper cylinder 2 is adjustable different to adapt to
Rock core height.If applied simultaneously in the left side of left end cap 1 and the right side of right piston 7 in the measurement process of above-mentioned permeability
Load lotus can measure the permeability of the rock core under the effect of certain load.
The core holding unit is for measuring compression fatigue characteristic of the core sample under water environment.It is similar to permeability first
Measurement process, be in core sample under water environment, fatigue load loads left side and right piston 7 in left end cap 1 respectively
Right side.By adjusting the amplitude of fatigue load, and the fatigue load periodicity that sample is loaded into needed for destroying is recorded, it can be with
Obtain S-N curve (S-N curve) of sample under the conditions of compression fatigue.Pass through crackle on sample after measurement fatigue loading
Length, density and crack tip opening displacement, and record corresponding fatigue load periodicity, available fatigue load periodicity with
Length, the relationship of density and crack tip opening displacement of crackle, wherein the length, density of crackle use vernier caliper measurement, split point
Opening displacement is taken pictures measurement using scanning electron microscope.
The core holding unit can also be used in the intensity measured core sample under water environment, elasticity modulus.It is similar to first
The measurement process of permeability is in core sample under water environment, and single axis test machines compressive load is loaded respectively in left end cap 1
The right side of left side and right piston 7, by the power and displacement in record experimental machine loading procedure, available core sample is surveyed
Start to be loaded into the curves of stress-strain relationship during final compression failure, the maximum stress on curve is exactly core sample
Compressive strength, by the slope of a curve it can be concluded that the elasticity modulus of core sample.
Claims (4)
1. a kind of measurement method of core holding unit, the core holding unit includes clamper cylinder (2), is arranged in clamper cylinder
Screw thread company is respectively adopted in core sample (15) in body (2), clamper cylinder (2) and left end cap (1) and hollow right end cap (5)
It connects, places porous gasket (3) between left end cap (1) and core sample (15), setting is right in the hollow cavity of hollow right end cap (5)
Piston (7) is arranged right plug (6) between right piston (7) and hollow right end cap (5) inner wall, and right plug (6) passes through screw thread and the hollow right side
The inner wall of end cap (5) connects, and places porous gasket (3) between core sample (15) and right plug (6) and right piston (7)；In rock core
Rubber bush (4) are wrapped on the outside of the left half of the right half and right plug (6) of sample (15) and left end cap (1)；It is described
Cavity between clamper cylinder (2), core sample (15), left end cap (1) and hollow right end cap (5) forms pressure indoor (8)；It is described
It is provided on the downside of clamper cylinder (2) confining pressure fluid inlet (14), upside is provided with confining pressure fluid outlet (13)；The right plug
(6) being provided with through-hole is Experimental Flowing Object entrance (11), and it is that Experimental Flowing Object exports (12) that the left end cap (1), which is provided with through-hole,；
It is characterized by: the measurement method is as follows:
The core holding unit is for measuring core sample along the permeability in gripper axes direction: opening confining pressure fluid outlet
(13), by confining pressure fluid inlet (14) to pressure indoor (8) inject confining pressure fluid, after confining pressure fluid fill pressure indoor (8) afterwards close
Confining pressure fluid outlet (13) are closed, close confining pressure fluid inlet (14) after the pressure of pressure indoor reaches the value that experiment needs；It surveys
The Experimental Flowing Object for measuring permeability flows into core sample (15) from Experimental Flowing Object entrance (11), flows out rock from Experimental Flowing Object outlet (12)
Heart sample (15) is changed with time meter by measurement experiment fluid in the pressure difference that core sample (15) flow into end and outflow end
Calculate permeability；The pressure values of added confining pressure fluid must be bigger than the pressure values of Experimental Flowing Object；At left and right sides of core sample (15)
Porous gasket (3) for guaranteeing that Experimental Flowing Object flows evenly through core sample；Right plug (6) and right piston (7) insertion clamping
The depth of device cylinder (2) is adjustable to adapt to different rock core height；If simultaneously on a left side in the measurement process of above-mentioned permeability
The left side of end cap (1) and the right side of right piston (7), which apply load, can measure the infiltration of the rock core under the effect of certain load
Saturating rate；
The core holding unit is for measuring compression fatigue characteristic of the core sample under water environment: being seeped first using foregoing
Saturating rate measurement process is in core sample under water environment, and fatigue load loads left side and right work in left end cap (1) respectively
Fill in the right side of (7)；By adjusting the amplitude of fatigue load, and record the fatigue load period that sample is loaded into needed for destroying
Number, obtains S-N curve of sample under the conditions of compression fatigue i.e. S-N curve；By on sample after measurement fatigue loading
Length, density and the crack tip opening displacement of crackle, and record corresponding fatigue load periodicity, obtain fatigue load periodicity with
Length, the relationship of density and crack tip opening displacement of crackle, wherein the length, density of crackle use vernier caliper measurement, split point
Opening displacement is taken pictures measurement using scanning electron microscope；
The core holding unit is for measuring compressive strength and elasticity modulus of the core sample under water environment: first using such as preceding institute
The permeability survey process stated is in core sample under water environment, and single axis test machines compressive load is loaded respectively in left end cap
(1) right side of left side and right piston (7) obtains rock core examination by the power and displacement in record experimental machine loading procedure
Sample survey starts to be loaded into the curves of stress-strain relationship during final compression failure, and the maximum stress on curve is exactly rock core
The compressive strength of sample is obtained the elasticity modulus of core sample by the slope of a curve.
2. measurement method according to claim 1, it is characterised in that: the left and right edges of the rubber bush (4) are used respectively
Iron wire cranse (10) lock ring is on left end cap (1) and right plug (6).
3. measurement method according to claim 1, it is characterised in that: between the left end cap (1) and clamper cylinder (2),
Between hollow right end cap (5) and clamper cylinder (2), between right plug (6) and hollow right end cap (5) and right piston (7) and the right side it is stifled
The groove for placing sealing ring (9) is provided between head (6).
4. measurement method according to claim 1, it is characterised in that: the Experimental Flowing Object is water.
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