CN106226216A - A kind of core holding unit and measuring method thereof - Google Patents

A kind of core holding unit and measuring method thereof Download PDF

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Publication number
CN106226216A
CN106226216A CN201610537817.1A CN201610537817A CN106226216A CN 106226216 A CN106226216 A CN 106226216A CN 201610537817 A CN201610537817 A CN 201610537817A CN 106226216 A CN106226216 A CN 106226216A
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China
Prior art keywords
cap
core
core sample
confined pressure
sample
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CN201610537817.1A
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Chinese (zh)
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CN106226216B (en
Inventor
杨鹏飞
党斐
陈曦
闫渊
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董润华
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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
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • G01N3/04Chucks
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/006Crack, flaws, fracture or rupture
    • G01N2203/0062Crack or flaws
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073Fatigue
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/04Chucks, fixtures, jaws, holders or anvils

Abstract

A kind of core holding unit and measuring method thereof, this core holding unit includes clamper cylinder, it is arranged on the core sample in clamper cylinder, clamper cylinder is respectively adopted threadeds with left end cap and hollow right end cap, right piston is set in the hollow cavity of hollow right end cap, between right piston and hollow right end cap inwall, right plug is set;It is wrapped in rubber bush in the outside of core sample and the left half of the right half of left end cap and right plug;Cavity between clamper cylinder, core sample, left end cap and hollow right end cap forms confined pressure room;The downside of clamper cylinder has confined pressure fluid intake, and upside has confined pressure fluid issuing;It is Experimental Flowing Object entrance that right plug has through hole, and it is Experimental Flowing Object outlet that left end cap has through hole;The invention also discloses measuring method;The measurement of mechanics parameter and permeability can be realized, for needing the experiment measuring the fatigue properties of rock sample and permeability can be greatly improved conventional efficient simultaneously in same device.

Description

A kind of core holding unit and measuring method thereof

Technical field

The invention mainly relates to core permeability and the measurement apparatus of basic mechanical parameter thereof, be specifically related to a kind of rock core folder Holder and measuring method thereof, be a kind of core holding unit that can simultaneously measure mechanics parameter and permeability.

Background technology

Permeability is one of base attribute of material, and the geology at geological exploration and development, especially oil and natural gas is surveyed Visit and research and produce the fields such as exploitation, need to take out relevant formation core from underground, carry out rock core Physical Property Analysis experiment, measure phase Close the physical parameters such as the permeability of rock core, intensity, elastic modelling quantity, provide reference for actual development.

The permeability of rock is the lowest, and relatively commonly use in the current experimental technique measuring low-permeability is transient pressure Impulse method.And applying in the experimental provision of the program for placing the parts of rock to be measured is exactly core holding unit.Current rock Heart clamp holder can only realize simple measuring core permeability or measure permeability under the conditions of certain constantly acting load, it is impossible to The measurement of fatigue properties and permeability is realized in same device.

Summary of the invention

For the problem overcoming above-mentioned prior art to exist, it is an object of the invention to provide a kind of core holding unit and survey thereof Metering method, it is possible to mechanics parameter (fatigue properties, compressive strength and elastic modelling quantity) and permeability can be realized in same device Measure, for needing the experiment measuring the fatigue properties of rock sample and permeability can be greatly improved conventional efficient simultaneously.

In order to reach object above, the present invention adopts the following technical scheme that

A kind of core holding unit, including clamper cylinder 2, the core sample 15 being arranged in clamper cylinder 2, clamper Cylinder 2 is respectively adopted threadeds with left end cap 1 and hollow right end cap 5, places porous pad between left end cap 1 and core sample 15 Sheet 3, arranges right piston 7 in the hollow cavity of hollow right end cap 5, arrange right plug 6 between right piston 7 and hollow right end cap 5 inwall, Right plug 6 is connected with the inwall of hollow right end cap 5 by screw thread, places porous between core sample 15 and right plug 6 and right piston 7 Pad 3;It is wrapped in rubber bush 4 in the outside of core sample 15 and the left half of the right half of left end cap 1 and right plug 6; Cavity between described clamper cylinder 2, core sample 5, left end cap 1 and hollow right end cap 5 forms confined pressure room 8;Described clamper The downside of cylinder 2 has confined pressure fluid intake 14, and upside has confined pressure fluid issuing 13;Described right plug 6 has through hole for real Testing fluid intake 11, it is Experimental Flowing Object outlet 12 that described left end cap 1 has through hole.

The left and right edges of described rubber bush 4 uses iron wire cranse 10 lock ring respectively on left end cap 1 and right plug 6.

Between described left end cap 1 and clamper cylinder 2, between hollow right end cap 5 and clamper cylinder 2, right plug 6 and hollow right The groove placing sealing ring 9 it is provided with between end cap 5 and between right piston 7 and right plug 6.

The measuring method of core holding unit described above,

This core holding unit is for measuring the core sample permeability along gripper axes direction: open confined pressure fluid issuing 13, inject confined pressure fluid by confined pressure fluid intake 14 to confined pressure room 8, after confined pressure fluid fills confined pressure room 8, close confined pressure stream Body outlet 13, until the pressure of confined pressure room closes confined pressure fluid intake 14 after reaching the value that experiment needs;Measure the reality of permeability Test fluid and flow into core sample 15 from Experimental Flowing Object entrance 11, from Experimental Flowing Object outlet 12 outflow core sample 15, by measuring The pressure difference that Experimental Flowing Object flows into end and outflow end at core sample 15 can calculate permeability over time;Added by enclose The pressure values of baric flow body must be bigger than the pressure values of Experimental Flowing Object;The porous gasket 3 of core sample 15 left and right sides is used for ensureing Experimental Flowing Object flows evenly through core sample;Right plug 6 and right piston 7 insert the depth adjustable of clamper cylinder 2 to adapt to not Same rock core height;If simultaneously at the left side of left end cap 1 and the right-hand member of right piston 7 during the measurement of above-mentioned permeability Face imposed load just can measure the permeability of rock core under certain load effect;

This core holding unit is for measuring core sample compression fatigue characteristic under water environment: be first similar to permeability Measurement process, make core sample be under water environment, fatigue load is carried in left side and the right piston 7 of left end cap 1 respectively Right side;By adjusting the amplitude of fatigue load, and record sample and be loaded into the fatigue load periodicity needed for destruction, it is possible to Obtain sample S-N curve under the conditions of compression fatigue i.e. S-N curve;By crackle on sample after measurement fatigue loading Length, density and crack tip opening displacement, and record corresponding fatigue load periodicity, it is possible to obtain fatigue load periodicity with The relation of the length of crackle, density and crack tip opening displacement, wherein the length of crackle, density use vernier caliper measurement, split point Opening displacement uses scanning electron microscope to take pictures measurement;

This core holding unit is for measuring core sample compressive strength under water environment and elastic modelling quantity: be first similar to The measurement process of permeability, makes core sample be under water environment, and single axis test machines compressive load is carried in left end cap 1 respectively Left side and the right side of right piston 7, by the power in record experimental machine loading procedure and displacement, it is possible to obtains core sample and surveys Starting 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, this slope of a curve can be derived that the elastic modelling quantity of core sample.

Compared to the prior art, the invention have the advantages that

(1) fatigue properties and permeability survey can be realized in same device, for needing to measure rock sample simultaneously The experiment of fatigue properties and permeability can be greatly improved conventional efficient.

(2) height of core holding unit measurement core sample can change.

(3) this core holding unit can measure the permeability of rock core under certain load effect, and strong under water environment Degree, elastic modelling quantity and the measurement of fatigue properties.

(4) Experimental Flowing Object of this core holding unit test permeability can be water or saline.Adjust suitably when using saline The concentration of salt can be with simulated seawater environment.

Accompanying drawing explanation

Fig. 1 core holding unit of the present invention structural representation.

Detailed description of the invention

Below in conjunction with the accompanying drawings and detailed description of the invention, the present invention is described in further details.

As it is shown in figure 1, one core holding unit of the present invention, mainly include 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, confined pressure room 8, sealing ring 9, iron wire cranse 10, Experimental Flowing Object entrance 11, Experimental Flowing Object outlet 12, confined pressure fluid intake 14 and confined pressure fluid issuing 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 confined pressure fluid uses oil, and rubber bush 4 uses poly-ammonia Ester, porous gasket uses ZrC material.Clamper cylinder 2 is respectively adopted threadeds with left end cap 1 and right end cap 5, left end cap 1 And placing porous gasket 3 between core sample 15, be threaded connection between right end cap 5 and right plug 6, core sample 15 is with right Porous gasket 3 is placed between plug 6 and right piston 7.At core sample 15 and the right half of left end cap and the left part of right plug The outside divided is wrapped in rubber bush 4, and the left and right edges at rubber bush 4 uses iron wire cranse 10 lock ring on left end cap and the right side respectively On plug.

This core holding unit is for measuring the core sample permeability along gripper axes direction.Open confined pressure fluid issuing 13, inject confined pressure fluid by confined pressure fluid intake 14 to confined pressure room 8, after confined pressure fluid fills confined pressure room 8, close confined pressure stream Body outlet 13, until the pressure of confined pressure room closes confined pressure fluid intake 14 after reaching the value that experiment needs.Measure the reality of permeability Test fluid and flow into core sample from Experimental Flowing Object entrance 11, from Experimental Flowing Object outlet 12 outflow core sample, pass through experiments of measuring The pressure difference that fluid flows into end and outflow end at core sample can calculate permeability over time.Added confined pressure fluid Pressure values must be bigger than the pressure values of Experimental Flowing Object.The porous gasket of core sample 15 left and right sides is used for ensureing Experimental Flowing Object Flow evenly through core sample.Right end cap 6 and right piston 7 insert the degree of depth of clamper cylinder 2 and can be adapted to different Rock core height.If executed in the right side of the left side of left end cap 1 and right piston 7 during the measurement of above-mentioned permeability simultaneously Add load and just can measure the permeability of rock core under certain load effect.

This core holding unit is for measuring core sample compression fatigue characteristic under water environment.First permeability it is similar to Measurement process, make core sample be under water environment, fatigue load is carried in left side and the right piston 7 of left end cap 1 respectively Right side.By adjusting the amplitude of fatigue load, and record sample and be loaded into the fatigue load periodicity needed for destruction, permissible Obtain sample S-N curve (S-N curve) under the conditions of compression fatigue.By 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 The relation of the length of crackle, density and crack tip opening displacement, wherein the length of crackle, density use vernier caliper measurement, split point Opening displacement uses scanning electron microscope to take pictures measurement.

This core holding unit can be additionally used in measures core sample intensity under water environment, elastic modelling quantity.First it is similar to The measurement process of permeability, makes core sample be under water environment, and single axis test machines compressive load is carried in left end cap 1 respectively Left side and the right side of right piston 7, by the power in record experimental machine loading procedure and displacement, can obtain core sample and survey Starting 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, this slope of a curve can draw the elastic modelling quantity of core sample.

Claims (5)

1. a core holding unit, it is characterised in that: include clamper cylinder (2), be arranged on the rock core in clamper cylinder (2) Sample (15), clamper cylinder (2) is respectively adopted threadeds with left end cap (1) and hollow right end cap (5), left end cap (1) with Place porous gasket (3) between core sample (15), right piston (7), right piston are set in the hollow cavity of hollow right end cap (5) (7) and arrange right plug (6) between hollow right end cap (5) inwall, right plug (6) is by the inwall of screw thread with hollow right end cap (5) Connect, between core sample (15) and right plug (6) and right piston (7), place porous gasket (3);On core sample (15) and a left side The outside of the right half of end cap (1) and the left half of right plug (6) is wrapped in rubber bush (4);Described clamper cylinder (2), Cavity between core sample (15), left end cap (1) and hollow right end cap (5) forms confined pressure room (8);Described clamper cylinder (2) Downside have confined pressure fluid intake (14), upside has confined pressure fluid issuing (13);Described right plug (6) has through hole for real Testing fluid intake (11), it is that Experimental Flowing Object exports (12) that described left end cap (1) has through hole.
A kind of core holding unit the most according to claim 1, it is characterised in that: the left and right edges of described rubber bush (4) Respectively with iron wire cranse (10) lock ring on left end cap (1) and right plug (6).
A kind of core holding unit the most according to claim 1, it is characterised in that: described left end cap (1) and clamper cylinder (2) between, 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 between right plug (6), it is provided with the groove placing sealing ring (9).
4. the measuring method of the core holding unit described in claim 1, it is characterised in that:
This core holding unit is for measuring the core sample permeability along gripper axes direction: open confined pressure fluid issuing (13), inject confined pressure fluid by confined pressure fluid intake (14) to confined pressure room (8), fill confined pressure room (8) until confined pressure fluid and close afterwards Close confined pressure fluid issuing (13), until the pressure of confined pressure room closes confined pressure fluid intake (14) after reaching the value that experiment needs;Survey The Experimental Flowing Object of amount permeability flows into core sample (15) from Experimental Flowing Object entrance (11), flows out rock from Experimental Flowing Object outlet (12) Heart sample (15), the pressure difference flowing into end and outflow end at core sample (15) by experiments of measuring fluid over time can Enough calculate permeability;The pressure values of added confined pressure fluid must be bigger than the pressure values of Experimental Flowing Object;Core sample (15) left and right The porous gasket (3) of both sides is used for ensureing that Experimental Flowing Object flows evenly through core sample;Right plug (6) and right piston (7) insert The depth adjustable of clamper cylinder (2) is to adapt to different rock core height;If during the measurement of above-mentioned permeability simultaneously Right side imposed load at the left side of left end cap (1) and right piston (7) just can measure rock core under certain load effect Permeability;
This core holding unit is for measuring core sample compression fatigue characteristic under water environment: be first similar to the survey of permeability Amount process, makes core sample be under water environment, and fatigue load is carried in left side and the right piston (7) of left end cap (1) respectively Right side;By adjusting the amplitude of fatigue load, and record sample and be loaded into the fatigue load periodicity needed for destruction, it is possible to Obtain sample S-N curve under the conditions of compression fatigue i.e. S-N curve;By crackle on sample after measurement fatigue loading Length, density and crack tip opening displacement, and record corresponding fatigue load periodicity, it is possible to obtain fatigue load periodicity with The relation of the length of crackle, density and crack tip opening displacement, wherein the length of crackle, density use vernier caliper measurement, split point Opening displacement uses scanning electron microscope to take pictures measurement;
This core holding unit is for measuring core sample compressive strength under water environment and elastic modelling quantity: be first similar to infiltration The measurement process of rate, makes core sample be under water environment, and single axis test machines compressive load is carried in a left side for left end cap (1) respectively End face and the right side of right piston (7), by the power in record experimental machine loading procedure and displacement, it is possible to obtains core sample and surveys Starting 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, this slope of a curve can be derived that the elastic modelling quantity of core sample.
Measuring method the most according to claim 4, it is characterised in that: described Experimental Flowing Object is water or saline.
CN201610537817.1A 2016-07-05 2016-07-05 A kind of core holding unit and its measurement method CN106226216B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107202875A (en) * 2017-04-25 2017-09-26 中国石油天然气股份有限公司 Determine system and method for the under test gas to stratum lithological effects
CN107894382A (en) * 2017-10-05 2018-04-10 西南石油大学 A kind of HTHP core holding unit
CN106769767B (en) * 2016-12-26 2018-07-03 中国石油大学(华东) The measuring device and method of a kind of anisotropic rock permeability and elasticity modulus
CN108680481A (en) * 2018-05-15 2018-10-19 中国石油大学(北京) Permeability saturation curve test method and device
CN110501195A (en) * 2019-08-20 2019-11-26 青岛海洋地质研究所 Polymorphic type gas hydrates rock core preparation method

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CN104048982A (en) * 2014-06-30 2014-09-17 中国科学院武汉岩土力学研究所 Multifunctional rock core holder for rock core scale nuclear magnetic resonance test
CN104596905A (en) * 2014-12-31 2015-05-06 西南石油大学 Device and method for measuring permeability of rock in fracturing process
CN104677805A (en) * 2015-03-20 2015-06-03 中国海洋石油总公司 Rock core clamping device, pollution kettle and rock core damage evaluation experiment method
CN204679347U (en) * 2015-06-18 2015-09-30 西南石油大学 A kind of drilling fluid pressurization sealing crushing test device
CN105277582A (en) * 2015-10-22 2016-01-27 成都岩心科技有限公司 Special core holder for nuclear magnetic resonance

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WO2008132132A1 (en) * 2007-04-26 2008-11-06 Shell Internationale Research Maatschappij B.V. Formation core sample holder assembly and testing method
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KR20120070453A (en) * 2010-12-21 2012-06-29 세종대학교산학협력단 Development of sequential polymer injection system for conformance control
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106769767B (en) * 2016-12-26 2018-07-03 中国石油大学(华东) The measuring device and method of a kind of anisotropic rock permeability and elasticity modulus
CN107202875A (en) * 2017-04-25 2017-09-26 中国石油天然气股份有限公司 Determine system and method for the under test gas to stratum lithological effects
CN107202875B (en) * 2017-04-25 2019-09-10 中国石油天然气股份有限公司 Determine under test gas to the system and method for stratum lithological effects
CN107894382A (en) * 2017-10-05 2018-04-10 西南石油大学 A kind of HTHP core holding unit
CN108680481A (en) * 2018-05-15 2018-10-19 中国石油大学(北京) Permeability saturation curve test method and device
CN110501195A (en) * 2019-08-20 2019-11-26 青岛海洋地质研究所 Polymorphic type gas hydrates rock core preparation method
CN110501195B (en) * 2019-08-20 2020-06-30 青岛海洋地质研究所 Preparation method of multi-type natural gas hydrate core

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