CN104048982B - A kind of Multifunctional core clamp holder of rock core Scaling Kernel magnetic resonance experiments - Google Patents

A kind of Multifunctional core clamp holder of rock core Scaling Kernel magnetic resonance experiments Download PDF

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Publication number
CN104048982B
CN104048982B CN201410310741.XA CN201410310741A CN104048982B CN 104048982 B CN104048982 B CN 104048982B CN 201410310741 A CN201410310741 A CN 201410310741A CN 104048982 B CN104048982 B CN 104048982B
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sample
cushion block
upstream
oil cylinder
downstream
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CN201410310741.XA
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Chinese (zh)
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CN104048982A (en
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袁维
李小春
方志明
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中国科学院武汉岩土力学研究所
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Abstract

The invention discloses the Multifunctional core clamp holder of a kind of rock core Scaling Kernel magnetic resonance experiments, clamper end cap is connected with fixing blocking up, circulation hydraulic oil outlet is fixing stifled internal perforate, fixing blocking up is connected with stack shell, stack shell is connected with oil cylinder, oil cylinder downstream oil filler point, oil cylinder upstream oil filler point and circulation hydraulic oil inlet are the perforate within oil cylinder, oil cylinder is connected with cylinder cover, and sealed by sealing ring, sample upstream water injection hole is the perforate within the cushion block of sample upstream, sample upstream cushion block is inserted directly into piston, sample downstream water injection hole is the perforate within the cushion block of sample downstream, sample downstream cushion block is inserted directly into clamper end cap, core sample is placed between sample upstream cushion block and sample downstream cushion block, displacement transducer pillar is connected with piston, displacement transducer pillar is connected with pressure lever type displacement transducer.Simple in construction, easy to use, carry out the research of the Porous Media mechanics of different temperatures, different stress condition, different pore pressure, different rock core size.

Description

A kind of Multifunctional core clamp holder of rock core Scaling Kernel magnetic resonance experiments

Technical field

The present invention relates to the clamper in rock mechanics experiment device, be more particularly to one for rock core yardstick nuclear-magnetism altogether Shake the Multifunctional core clamp holder tested, it is adaptable to the rock core of difformity size, thus realizes nuclear magnetic resonance, NMR rock core test.

Background technology

Nuclear magnetic resonance, NMR is a kind of quick, lossless, nontoxic pollution-free, need not follow the trail of the detection technique of reagent, thus extensively It is applied to laboratory core test.In indoor nuclear magnetic resonance, NMR rock core test, generally utilize the nmr phenomena of hydrogen atom, analyze The character such as the porosity of rock core, saturation, permeability, meanwhile, utilize corresponding nmr imaging technique, Observable fluid Migration process, the process of deformation and failure of core sample, and then the research waterpower of porous media, i.e. core sample, mechanical property, because of This, it is adaptable to oil, natural gas extraction and CO2The basic research in the fields such as geological storage.Therefore, it is adaptable to nuclear magnetic resonance, NMR rock core The clamper of test is by the key of such test.

Being mainly pooled applications in seepage tests currently for the clamper of nuclear magnetic resonance, NMR rock core test, the most biphase displacement tries Testing and flow test, part clamper can apply confined pressure and heating temperature control, and is only applicable to single rock core size, it is possible to executes The clamper adding axial compression is the fewest.Not yet find to apply confined pressure, heating temperature control, axial compression, and the nuclear-magnetism of sample deformation can be measured Resonance test cell.

Summary of the invention

The invention aims to overcome the deficiency of current techniques equipment, be to there are provided a kind of rock core yardstick nuclear-magnetism The Multifunctional core clamp holder of resonance test, simple in construction, easy to use, carry out different temperatures, different stress condition, different hole Pressure, the basic research of the corresponding aspect of Porous Media-mechanics of different rock core size.

In order to realize above-mentioned purpose, the present invention uses techniques below measure:

For the nuclear magnetic resonance, NMR rock core test of laboratory core yardstick, design one can apply confined pressure, axial compression, hole to sample Pressure, the core holding unit of heating temperature control, and can be by adjusting cushion block.A kind of multi-functional rock core of rock core Scaling Kernel magnetic resonance experiments Clamper, including: clamper end cap, fixing stifled, sample downstream water injection hole, stack shell, sample upstream water injection hole, the oiling of oil cylinder downstream Hole, oil cylinder upstream oil filler point, cylinder cover, displacement transducer pillar, pressure lever type displacement transducer, sealing ring, oil cylinder, piston, Circulation hydraulic oil inlet, sample upstream cushion block, core sample, sample downstream cushion block, circulation hydraulic oil outlet, bolt.

It is characterized in that: clamper end cap is connected with fixing blocking up, circulation hydraulic oil outlet is fixing stifled internal Perforate, fixes and blocks up with stack shell with threadeding.Stack shell with oil cylinder with threadeding.Oil cylinder downstream oil filler point, the oiling of oil cylinder upstream Hole and circulation hydraulic oil inlet are perforate oil cylinder within, and oil cylinder, and is sealed by sealing ring with threadeding with cylinder cover, tries Sample upstream water injection hole is the perforate within the cushion block of sample upstream.Sample upstream cushion block is inserted directly into piston and is attached, under sample Trip water injection hole is the perforate within the cushion block of sample downstream.Sample downstream cushion block is inserted directly into clamper end cap and is attached, rock core Sample is placed between sample upstream cushion block and sample downstream cushion block, makes upstream cushion block, rock core and downstream cushion block centrage keep one Cause, put heat-shrink tube the most outside, and be allowed to pyrocondensation fastening with heat gun.Displacement transducer pillar is with piston with screw thread even Connect.Displacement transducer pillar is connected with the clamping of pressure lever type displacement transducer.

From left to right, clamper end cap is connected with fixing stifled, fixing stifled with stack shell, stack shell and oil cylinder, oil cylinder with Cylinder cover all links with screw thread;Clamper end cap, fixing stifled, stack shell, oil cylinder and piston form one for core sample Apply the space of confined pressure;Cylinder cover, oil cylinder and piston form one for the space applying axial compression to core sample;Displacement passes Sensor pillar and pressure lever type displacement transducer and piston, can the displacement of piston during determination test, and then measure core sample Axial deformation;All junctions all seal with high-pressure seal ring.

Its operation principle is as follows:

Circulation hydraulic oil inlet, circulation hydraulic oil outlet are connected to form one with external circulation pressurization attemperating unit and close back Road, can apply confined pressure to core sample, can regulate its temperature simultaneously.

1. circulate hydraulic oil inlet, circulation hydraulic oil outlet is connected to form a Guan Bi with external circulation pressurization attemperating unit Loop, can apply confined pressure to core sample, can regulate its temperature simultaneously.

2. oil cylinder upstream oil filler point is connected with external oil collecting press pump, injects hydraulic oil toward oil cylinder, promotes piston-advance, before piston When entering, apply xial feed by sample upstream cushion block to core sample;Meanwhile, pressure lever type displacement transducer passes through displacement sensing Device pillar is connected with piston, and piston, during advancing, drives displacement transducer pillar to move, thus compresses pressure lever type displacement Sensor, and then record the displacement of piston in loading procedure, the axial deformation of core sample can be drawn;Oil cylinder downstream oil filler point It is hydraulic pressure oil outlet in axially loaded process oil cylinder, is again the oil filler point of backward stroke of the piston in uninstall process.

3. sample upstream water injection hole, sample downstream water injection hole are connected with external pump, can apply seepage flow limit to core sample Boundary's condition or injection fluid.

4. sample upstream cushion block and sample downstream cushion block are processed to variable cross-section shape.Afterbody is cylinder plugs, respectively Insert in piston and clamper end cap Baltimore groove, can freely mount and dismount;The part contacted with core sample can be as required It is processed into cylinder or the cuboid of different length, to adapt to the core sample of different sizes and shapes;Sample upstream cushion block, Core sample and cushion block surface, sample downstream put heat-shrinkable T bush, and pyrocondensation fastening, can prevent fluid from altering on core sample surface Stream, also can make the fluid that injects in core sample separate with the circulation fluid force feed in stack shell.

5. stack shell, sample upstream cushion block and sample downstream cushion block are all by high intensity, anticorrosion, PEEK material without nuclear magnetic signal Material processes, and can transmit enough loads, again without interference with the nuclear magnetic signal in experimentation.

According to above 5, this can give difformity, various sizes of core sample under the conditions of nmr experiments A kind of clamping device that can simultaneously apply confined pressure, heating temperature control, axial compression is provided.

Originally have the advantages that:

Present invention can be implemented in the fluid-wall interaction test carrying out rock core yardstick in nuclear magnetic resonance analyser, research core sample exists The mechanism that seepage flow-mechanics under the conditions of different stress conditions, different temperatures, different pore pressure interacts;Also may be implemented in nuclear-magnetism Resonance instrument carries out simple rock core circulation or displacement experiment, studies the seepage flow such as the porosity of core sample, saturation, porosity Rule;Also may be implemented in the normal triaxial Experiments of Machanics carried out in nuclear magnetic resonance analyser under the conditions of different temperatures, different confined pressure, research The mechanics parameter of core sample.

(1) core sample of difformity and size can be practically applicable to.Cushion block afterbody is barrel band, can be inserted into stack shell end cap With in the Baltimore groove of piston, can freely mount and dismount, therefore, only need to process difform cushion block, so that it may to different size Test with the core sample of shape.

(2) rock core test of multiple use can be realized.It is connected with external equipment, confined pressure, circulating-heating can be applied to sample Temperature control, applying axial compression, applying pore pressure, therefore, the seepage flow-mechanics that can study porous media interacts, and can study porous media Seepage flow mechanism, also can study the mechanical property of core sample.

In a word, this can realize the clamping action of several functions in terms of nuclear magnetic resonance, NMR rock core test.

Accompanying drawing explanation

Fig. 1 is the Multifunctional core clamp holder structural representation of a kind of rock core Scaling Kernel magnetic resonance experiments.

Fig. 2 is a kind of overall structure 3 D stereo schematic diagram.

Fig. 3 is a kind of overall structure schematic front view.

Fig. 4 is a kind of overall structure schematic side view.

Fig. 5 is a kind of clamper end cap bottom schematic view.

Fig. 6 is cross-sectional view at the water injection hole of a kind of sample upstream.

Wherein:

The 1 fixing stifled 3 sample downstream water injection holes of clamper end cap 2

4 water injection hole 6 oil cylinder downstream, stack shell 5 sample upstream oil filler points

7 oil cylinder upstream oil filler point 8 cylinder cover 9 displacement transducer pillars

10 WYDC-10L type pressure lever type displacement transducer (range 10mm, precision ± 0.1%F.S, sizes

11 sealing ring 12 oil cylinder 13 pistons

14 circulation hydraulic oil inlet 15 sample upstream cushion block 16 core samples

17 sample downstream cushion blocks 18 circulate hydraulic oil outlet 19 bolt 20 preformed hole.

Detailed description of the invention

Embodiment 1:

Below in conjunction with the accompanying drawings with enforcement example to originally further illustrating:

A kind of Multifunctional core clamp holder of rock core Scaling Kernel magnetic resonance experiments, including: clamper end cap 1, fixing stifled 2, Sample downstream water injection hole 3, stack shell 4, sample upstream water injection hole 5, oil cylinder downstream oil filler point 6, oil cylinder upstream oil filler point 7, oil cylinder end Lid 8, displacement transducer pillar 9, pressure lever type displacement transducer 10, sealing ring 11, oil cylinder 12, piston 13, circulation hydraulic oil inlet 14, sample upstream cushion block 15, core sample 16, sample downstream cushion block 17, circulation hydraulic oil outlet 18, bolt 19.It connects pass System is: clamper end cap 1 is connected with bolt 19 with fixing stifled 2.Circulation hydraulic oil outlet 18 is fixing stifled perforate within 2, Gu Surely 2 are blocked up with stack shell 4 with threadeding.Stack shell 4 with oil cylinder 12 with threadeding.Oil cylinder downstream oil filler point 6, oil cylinder upstream oil filler point 7 and circulation hydraulic oil inlet 14 be the perforate within oil cylinder 12, oil cylinder 12 with cylinder cover 8 with threadeding, and by sealing ring 11 seal, and sample upstream water injection hole 5 is the perforate within sample upstream cushion block 15.Sample upstream cushion block 15 is inserted directly into piston 13 Being attached, sample downstream water injection hole 3 is the perforate within sample downstream cushion block 17.Sample downstream cushion block 17 is inserted directly into clamping Device end cap 1 is attached.Core sample 16 is placed between sample upstream cushion block 15 and sample downstream cushion block 17, makes upstream cushion block 15, rock core 16 keeps consistent with downstream cushion block 17 centrage, puts heat-shrink tube the most outside, and is allowed to pyrocondensation with heat gun Fastening.Displacement transducer pillar 9 with piston 13 with threadeding.Displacement transducer pillar 9 is used with pressure lever type displacement transducer 10 Clamping connects.

Stack shell 4, sample upstream cushion block 15 and sample downstream cushion block 17 all use the high-strength PEEK material without nuclear magnetic signal to add Work forms, and can transmit enough loads, and again without interference with the nuclear magnetic signal in experimentation, other parts are stainless steel Material processes.

Circulation hydraulic oil inlet 14 and circulation hydraulic oil outlet 18 are connected with external heating, pressurized circulation system, can give examination Sample 16 applies confined pressure and controls temperature.Oil cylinder upstream oil filler point 7 is connected with external pump, injects oil body toward oil cylinder 12, promotes piston During 13 advance, apply xial feed, simultaneous displacement sensor strut 9 and depression bar to core sample 16 by sample upstream cushion block 15 Formula displacement transducer 10 is followed piston 13 and is moved, and measures the axial deformation of core sample 16.Oil cylinder downstream oil filler point 6 and external pump Be connected, can be used for promote piston 13 backhaul, it addition, piston 13 advance apply axial compression to core sample 16 time, oil cylinder downstream note Oilhole 6 also can be used to get rid of oil body.Sample downstream water injection hole 3, sample upstream water injection hole 5 are connected with external pump, for rock core Sample 16 injects fluid or application well pressure boundary condition, the sample upstream water injection hole inside oil cylinder 12 and sample upstream cushion block 15 5 manage connected with the PEEK without nuclear magnetic signal;Preformed hole 20 is had, itself and sample upstream water injection hole 5, circulation fluid in oil cylinder (12) the inside Force feed import 14 is in identical section, and shape is identical with the two.

Sample upstream cushion block 15 is all processed into barrel band form with the afterbody of sample downstream cushion block 17, inserts clamping respectively Device end cap 1, with the groove of piston 13, can freely be dismantled and install;Sample upstream cushion block 15 and the main body of sample downstream cushion block 17 Part can be processed into circular or square, and variable-length moves, for difformity and the sample of size, it addition, main part Cross section bigger than afterbody cross section, the xial feed that applies for loading piston 13.

Each modular construction:

1, sample upstream cushion block 15, sample downstream cushion block 17:

As indicated with 1, sample upstream/downstream cushion block 15/17 is by high-strength, anticorrosion, without the PEEK materials processing of nuclear magnetic signal Form;Afterbody is processed into cylinder plugs, inserts in the Baltimore groove of clamper end cap 1 and piston 13 respectively, the installation and dismantling of convenient peace Unload;It is processed into cylinder or cuboid as required with the shape of core sample 16 contact portion, thus is applicable to not similar shape Shape, various sizes of core sample 16;Tiny circular hole, i.e. sample upstream water injection hole 5 and sample downstream note it is machined with in the middle of cushion block Water hole 3, is connected with external pump, can inject fluid to sample or apply the boundary condition of seepage flow.

2, stack shell 4:

As it is shown in figure 1, the PEEK materials processing that stack shell 4 is by high-strength, anticorrosion, without nuclear magnetic signal forms, two ends respectively with Fixing stifled 2, oil cylinder 12 form of screw thread connects, and provides an airtight confined pressure environment to core sample 16.

3, oil cylinder 12, piston 13:

As Figure 1-Figure 4, oil cylinder 12 and piston 13 are for providing xial feed to core sample 16, rustless steel adding Work forms.Oil cylinder upstream oil filler point 7 and oil cylinder downstream oil filler point 6 are located at oil cylinder 12 side, are connected with external pump oil pump.Hydraulic oil Injected oil cylinder 12 by oil cylinder upstream oil filler point 7, promote piston 13 to advance, thus apply xial feed to core sample 16.Work as work During plug 13 advance, the hydraulic oil in oil cylinder is discharged, simultaneously from oil cylinder downstream oil filler point 6, it is possible to inject hydraulic pressure toward oil cylinder from there Oil makes piston 13 backhaul.

As shown in Fig. 1, Fig. 6, the same section of oil cylinder 12 is machined with sample upstream water injection hole 5, circulation hydraulic oil inlet 14 With two preformed holes 20.Oil cylinder 12 is connected by PEEK tubule with the sample upstream water injection hole 5 on sample upstream cushion block 15, thus The fluid making extraneous pump goes directly core sample 16.Circulation hydraulic oil inlet 14, the fixing circulation hydraulic oil outlet 18 blocked up on 2 are with outer Connect circulation hydraulic pressure heating temperature control device to be connected, apply confined pressure and heating temperature control to core sample 16.Preformed hole 20 can be as standby Hand-hole.

4, displacement transducer pillar 9, pressure lever type displacement transducer 10:

As Figure 1-Figure 4, displacement transducer pillar 9 is used for measuring rock in loading procedure with pressure lever type displacement transducer 10 The axial displacement of heart sample (16).

5, clamper end cap 1, fixing stifled 2:

As shown in Figure 1 and Figure 5, clamper end cap 1 is connected with bolt 19 with fixing stifled 2.

Two, installation method

1. allow core sample 16, sample upstream cushion block 15 and the adjacent docking of sample downstream cushion block 17, and make three's centrage Keep consistent, put heat-shrink tube the most outside, and be allowed to pyrocondensation fastening with heat gun.

2. piston 13 is pushed into bottom oil cylinder 12, and upright for oil cylinder 12, makes the Baltimore groove of piston 13 upward.

3. 1. walk, the, the core sample assembled and cushion block is upright, and the latch of sample upstream cushion block 15 is inserted live Fill in 13 Baltimore grooves.

4. stack shell 4 is installed, tightens threadeding between stack shell 4 with oil cylinder 12.

5. install fixing stifled 2, tighten fixing stifled threadeding between 2 with stack shell 4.

6. installing holder end cap 1, tightens fixing stifled bolt between 2 with clamper end cap 1 and is connected.

7. inject hydraulic oil from oil cylinder upstream oil filler point 7, promote piston 13 to advance, to core sample 16 apply one less Axial compression, with guarantee core sample 16 install fastening.

Three, the calculating of core sample axial stress

Core sample axial stress is calculated by below equation:

Wherein:

σRock coreCore sample axial stress

σOil cylinderOil cylinder upstream oil pressure

SOnOil cylinder upstream hydraulic oil and piston contact area

σConfined pressureCore sample confined pressure

SUnderStack shell inner loop hydraulic pressure oil bath piston interface amasss

σOil cylinder、σConfined pressureCan directly read according to external sensor, SOn、SUnderFor equipment constant.

Claims (3)

1. a Multifunctional core clamp holder for rock core Scaling Kernel magnetic resonance experiments, including clamper end cap (1), fixing stifled (2), Stack shell (4), displacement transducer pillar (9), pressure lever type displacement transducer (10), sealing ring (11), oil cylinder (12), piston (13), Sample upstream cushion block (15), core sample (16), sample downstream cushion block (17), it is characterised in that: clamper end cap (1) is with fixing Stifled (2) connect with bolt (19), and circulation hydraulic oil outlet (18) is the perforate that fixing stifled (2) are internal, fixing stifled (2) and stack shell (4) connecting, stack shell (4) is connected with oil cylinder (12), oil cylinder downstream oil filler point (6), oil cylinder upstream oil filler point (7) and circulation fluid force feed Import (14) is the perforate that oil cylinder (12) is internal, and oil cylinder (12) is connected with cylinder cover (8), and is sealed by sealing ring (11), examination Sample upstream water injection hole (5) is the perforate that sample upstream cushion block (15) is internal, and sample upstream cushion block (15) is inserted directly into piston (13), Sample downstream water injection hole (3) is the perforate that sample downstream cushion block (17) is internal, and sample downstream cushion block (17) is inserted directly into clamper End cap (1), core sample (16) is placed between sample upstream cushion block (15) and sample downstream cushion block (17), by covering at three The heat-shrink tube of parts surface connects, and displacement transducer pillar (9) is connected with piston (13), displacement transducer pillar (9) and depression bar Formula displacement transducer (10) connects;
The afterbody in sample upstream cushion block (15) and sample downstream cushion block (17) is processed into barrel band, inserts clamper end cap respectively (1) with the groove of piston (13), sample upstream cushion block (15) is processed into circular or square with sample downstream cushion block (17), pressure Rod-type displacement transducer (10) model is WYDC-10L, range 10mm, precision ± 0.1%F.S.
2. the Multifunctional core clamp holder of a kind of rock core Scaling Kernel magnetic resonance experiments as described in claim 1, it is characterised in that: Described stack shell (4), sample upstream cushion block (15) and sample downstream cushion block (17) all use the high-strength PEEK material without nuclear magnetic signal Material processes.
3. the Multifunctional core clamp holder of a kind of rock core Scaling Kernel magnetic resonance experiments as described in claim 1, it is characterised in that: Described circulation hydraulic oil inlet (14) and circulation hydraulic oil outlet (18) are connected with external heating, pressurized circulation system, oil cylinder Upstream oil filler point (7) is connected with external pump, and oil cylinder downstream oil filler point (6) is connected with external pump, sample downstream water injection hole (3), examination Sample upstream water injection hole (5) is connected with external pump, oil cylinder (12) and sample upstream water injection hole (5) of the inside, sample upstream cushion block (15) Manage with the PEEK without nuclear magnetic signal and be connected.
CN201410310741.XA 2014-06-30 2014-06-30 A kind of Multifunctional core clamp holder of rock core Scaling Kernel magnetic resonance experiments CN104048982B (en)

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CN106226216B (en) * 2016-07-05 2019-05-17 董润华 A kind of core holding unit and its measurement method
CN107703037A (en) * 2017-08-30 2018-02-16 中国石油天然气股份有限公司 For HTHP Natural Gas Migration And Accumulation visual detection device and method
CN107976351B (en) * 2017-11-27 2020-04-07 大连理工大学 Device and method for remolding marine natural gas hydrate rock core
CN110530771B (en) * 2019-09-02 2020-11-03 重庆大学 Pressure chamber for coal rock sample gas seepage test
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