CN104048982A - Multifunctional rock core holder for rock core scale nuclear magnetic resonance test - Google Patents
Multifunctional rock core holder for rock core scale nuclear magnetic resonance test Download PDFInfo
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Abstract
The invention discloses a multifunctional rock core holder for a rock core scale nuclear magnetic resonance test. According to the multifunctional rock core holder, an end cover of the holder is connected with a fixing plug by a bolt; a circulating hydraulic oil outlet is an opening in the fixing plug; the fixing plug is connected with a barrel body; the barrel body is connected with an oil cylinder; a downstream oil injection hole of the oil cylinder, an upstream oil injection hole of the oil cylinder and a circulating hydraulic oil inlet are openings in the oil cylinder; the oil cylinder is connected with an end cover of the oil cylinder and is sealed by a sealing ring; a test sample upstream water injection hole is an opening in a test sample upstream cushion block; the test sample upstream cushion block is directly inserted into a piston; a test sample downstream water injection hole is an opening in a test sample downstream cushion block; the test sample downstream cushion block is directly inserted into the end cover of the holder; a rock core test sample is placed between the test sample upstream cushion block and the test sample downstream cushion block; a displacement sensor support is connected with the piston; the displacement sensor support is connected with a pressure rod type displacement sensor. The multifunctional rock core holder is simple in structure and convenient to use, and can be used for carrying out porous medium percolation-mechanics researches of different temperatures, different stress conditions, different pore pressure and different rock core sizes.
Description
Technical field
The present invention relates to the clamper in rock mechanics experiment device, more specifically relate to a kind of Multifunctional core clamp holder for rock core Scaling Kernel magnetic resonance experiments, be applicable to the rock core of difformity size, thereby realize nuclear magnetic resonance rock core test.
Background technology
Nuclear magnetic resonance be a kind of fast, harmless, nontoxic pollution-free, do not need to follow the trail of the detection technique of reagent, thereby be widely used in laboratory core test.In indoor nuclear magnetic resonance rock core test, conventionally utilize the nmr phenomena of hydrogen atom, the character such as the factor of porosity of analysis rock core, saturation degree, permeability, meanwhile, utilize corresponding nmr imaging technique, the migration process of Observable fluid, the process of deformation and failure of core sample, and then research porous medium, be waterpower, the mechanical property of core sample, therefore, be applicable to oil, natural gas extraction and CO
2the fundamental research in the fields such as geological storage.Therefore the clamper that, is applicable to nuclear magnetic resonance rock core test is the key of carrying out such test.
Clamper for nuclear magnetic resonance rock core test is mainly that pooled applications is in seepage tests at present, be two-phase displacement test and flow test, part clamper can apply confined pressure and heating temperature control, and is only applicable to single rock core size, and the clamper that can apply axial compression is very few.Not yet find to apply confined pressure, heating temperature control, axial compression, and can measure the nuclear magnetic resonance test cell of sample deformation.
Summary of the invention
The object of the invention is in order to overcome the deficiency of current techniques equipment, it is the Multifunctional core clamp holder that has been to provide a kind of rock core Scaling Kernel magnetic resonance experiments, simple in structure, easy to use, carry out the fundamental research of the corresponding aspect of Porous Media-mechanics of different temperatures, different stress condition, different hole pressure, different rock core sizes.
In order to realize above-mentioned object, the present invention adopts following technical measures:
For the nuclear magnetic resonance rock core test of laboratory core yardstick, design and a kind ofly can apply to sample that confined pressure, axial compression, hole are pressed, the core holding unit of heating temperature control, and can be by adjusting cushion block.A Multifunctional core clamp holder for rock core Scaling Kernel magnetic resonance experiments, comprising: clamper end cap, fixing stifled, sample downstream water injection hole, stack shell, sample upstream water injection hole, oil cylinder downstream oil hole, oil cylinder upstream oil hole, cylinder cover, displacement transducer pillar, pressure lever type displacement transducer, O-ring seal, oil cylinder, piston, the import of circulation fluid force feed, sample upstream cushion block, core sample, sample downstream cushion block, the outlet of circulation fluid force feed, bolt.
It is characterized in that: clamper end cap is connected with bolt with fixing blocking up, circulation fluid force feed exports as fixing stifled inner perforate, fixes and blocks up with stack shell with being threaded.Stack shell with oil cylinder with being threaded.Oil cylinder downstream oil hole, oil cylinder upstream oil hole and the import of circulation fluid force feed are the perforate of oil cylinder inside, and oil cylinder, and is sealed by O-ring seal with being threaded with cylinder cover, and sample upstream water injection hole is the perforate of cushion block inside, sample upstream.Sample upstream cushion block directly inserts piston and connects, and sample downstream water injection hole is the perforate of cushion block inside, sample downstream.Sample downstream cushion block directly inserts clamper end cap and connects, core sample is placed between sample upstream cushion block and sample downstream cushion block, upstream cushion block, rock core and downstream cushion block center line are consistent, then put outside heat-shrink tube, and it are fastening with heat gun, to make it pyrocondensation.Displacement transducer pillar with piston with being threaded.Displacement transducer pillar is connected with clamping with pressure lever type displacement transducer.
From left to right, clamper end cap is connected with bolt with fixing blocking up, and fixing blocking up with stack shell, stack shell and oil cylinder, oil cylinder all linking with screw thread with cylinder cover; Clamper end cap, fixing stifled, stack shell, oil cylinder and piston form one for apply the space of confined pressure to core sample; Cylinder cover, oil cylinder and piston form one for apply the space of axial compression to core sample; Displacement transducer pillar, with pressure lever type displacement transducer and piston, can determination test process in the displacement of piston, and then measure the axial deformation of core sample; All junctions all seal with high-pressure seal ring.
Its principle of work is as follows:
The import of circulation fluid force feed, the outlet of circulation fluid force feed are connected to form a closed-loop path with external circulation pressurization attemperating unit, can apply confined pressure to core sample, can regulate its temperature simultaneously.
1. circulation fluid force feed import, the outlet of circulation fluid force feed are connected to form a closed-loop path with external circulation pressurization attemperating unit, can apply confined pressure to core sample, can regulate its temperature simultaneously.
2. oil cylinder upstream oil hole is connected with external oil collecting press pump, toward oil cylinder injection liquid force feed, promotes piston-advance, during piston-advance, by sample upstream cushion block, to core sample, applies xial feed; Meanwhile, pressure lever type displacement transducer is connected with piston by displacement transducer pillar, and piston is in the process of advancing, drive displacement transducer pillar to move, thereby compression pressure lever type displacement transducer, and then the displacement that records piston in loading procedure, the axial deformation that can draw core sample; Oil cylinder downstream oil hole is hydraulic pressure oil outlet in axial loading procedure oil cylinder, is again the oil hole 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 the boundary condition of seepage flow or inject fluid to core sample.
4. sample upstream cushion block and sample downstream cushion block are processed to variable cross section shape.Afterbody is cylinder plugs, inserts respectively in piston and clamper end cap Baltimore groove, can freely mount and dismount; The part contacting with core sample can be processed into right cylinder or the rectangular parallelepiped of different length as required, to adapt to the core sample of different size and shape; Sample upstream cushion block, core sample and cushion block surface, sample downstream put heat-shrinkable T bush, and pyrocondensation is fastening, can prevent that fluid from, in core sample surface channelling, also can make the injection fluid in core sample separated with the circulation fluid force feed of stack shell.
5. stack shell, sample upstream cushion block and sample downstream cushion block, all by high strength, anticorrosion, form without the PEEK materials processing of nuclear magnetic signal, can transmit enough loads, the nuclear magnetic signal in again can interference experiment process.
Described in above 5, this provides a kind of clamping device that can simultaneously apply confined pressure, heating temperature control, axial compression can to the core sample of difformity, different size under nmr experiments condition.
Originally have the following advantages and good effect:
Gu present invention can be implemented in the stream-coupling test that carries out rock core yardstick in nuclear magnetic resonance analyser, the seepage flow-mechanics interactional mechanism of research core sample under different stress conditions, different temperatures, different holes press strip part; Also can realize and in nuclear magnetic resonance analyser, carry out simple rock core circulation or displacement test, the percolation law such as the factor of porosity of research core sample, saturation degree, porosity; Also can realize the normal triaxial Experiments of Machanics of carrying out under different temperatures, different confined pressure condition in nuclear magnetic resonance analyser, the mechanics parameter of research core sample.
(1) can be practically applicable to the core sample of difformity and size.Cushion block afterbody is barrel band, can insert in the Baltimore groove of stack shell end cap and piston, can freely mount and dismount, and therefore, only needs the difform cushion block of processing, just can test the core sample of different size and shape.
(2) can realize multi-purpose rock core test.Be connected with external equipment, can apply confined pressure, circulating-heating temperature control to sample, apply axial compression, apply hole pressure, therefore, the seepage flow-mechanics that can study porous medium interacts, and can study the seepage flow mechanism of porous medium, also can study the mechanical property of core sample.
In a word, this can realize the clamping action of several functions aspect nuclear magnetic resonance rock core test.
Accompanying drawing explanation
Fig. 1 is a kind of Multifunctional core clamp holder structural representation of rock core Scaling Kernel magnetic resonance experiments.
Fig. 2 is a kind of one-piece construction 3 D stereo schematic diagram.
Fig. 3 is that a kind of one-piece construction master looks schematic diagram.
Fig. 4 is a kind of one-piece construction schematic side view.
Fig. 5 is a kind of clamper end cap bottom schematic view.
Fig. 6 is water injection hole place, a kind of sample upstream cross-sectional view.
Wherein:
1-clamper end cap 2-fixing stifled 3-sample downstream water injection hole
Water injection hole 6-oil cylinder downstream, 4-stack shell, 5-sample upstream oil hole
7-oil cylinder upstream oil hole 8-cylinder cover 9-displacement transducer pillar
10-WYDC-10L type pressure lever type displacement transducer (range 10mm, precision ± 0.1%F.S, size
Cushion block 16-core sample 17-sample downstream, 11-O-ring seal, 12-oil cylinder, 13-piston, 14-circulation fluid force feed import 15-sample upstream cushion block 18-circulation fluid force feed outlet 19-bolt 20-preformed hole.
Embodiment
Embodiment 1:
Below in conjunction with accompanying drawing and exemplifying embodiment to originally further illustrating:
A Multifunctional core clamp holder for rock core Scaling Kernel magnetic resonance experiments, comprising: 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 hole 6, oil cylinder upstream oil hole 7, cylinder cover 8, displacement transducer pillar 9, pressure lever type displacement transducer 10, O-ring seal 11, oil cylinder 12, piston 13, circulation fluid force feed import 14, sample upstream cushion block 15, core sample 16, sample downstream cushion block 17, circulation fluid force feed outlet 18, bolt 19.Its annexation is: clamper end cap 1 is connected with fixing stifled 2 use bolts 19.Circulation fluid force feed outlet 18 perforates for fixing stifled 2 inside, fixing stifled 2 are threaded with stack shell 4 use.Stack shell 4 is threaded with oil cylinder 12 use.Oil cylinder downstream oil hole 6, oil cylinder upstream oil hole 7 and circulation fluid force feed import 14 are the perforate of oil cylinder 12 inside, and oil cylinder 12 is threaded with cylinder cover 8 use, and is sealed by O-ring seal 11, and sample upstream water injection hole 5 is the perforate of cushion block 15 inside, sample upstream.Sample upstream cushion block 15 directly inserts piston 13 and connects, and sample downstream water injection hole 3 is the perforate of cushion block 17 inside, sample downstream.Sample downstream cushion block 17 directly inserts clamper end cap 1 and connects.Core sample 16 is placed between sample upstream cushion block 15 and sample downstream cushion block 17, and upstream cushion block 15, rock core 16 and downstream cushion block 17 center lines are consistent, and then put outside heat-shrink tube, and it is fastening with heat gun, to make it pyrocondensation.Displacement transducer pillar 9 is threaded with piston 13 use.Displacement transducer pillar 9 clamps and is connected with pressure lever type displacement transducer 10 use.
Stack shell 4, sample upstream cushion block 15 and sample downstream cushion block 17 all adopt the high-strength PEEK materials processing without nuclear magnetic signal to form, and can transmit enough loads, the nuclear magnetic signal in again can interference experiment process, and other parts are stainless steel material and process.
Circulation fluid force feed import 14 is connected with external heating, pressurized circulation system with circulation fluid force feed outlet 18, applies confined pressure can to sample 16 and control temperature.Oil cylinder upstream oil hole 7 is connected with external pump, toward oil cylinder 12, inject oil body, when promotion piston 13 advances, by sample upstream cushion block 15, apply xial feed to core sample 16, simultaneous displacement sensor strut 9 and pressure lever type displacement transducer 10 are followed piston 13 and are moved, and measure the axial deformation of core sample 16.Oil cylinder downstream oil hole 6 is connected with external pump, can be used for promoting piston 13 backhauls, in addition, at piston 13, advances while applying axial compression to core sample 16, and oil cylinder downstream oil hole 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 injecting fluid to core sample 16 or applying hole, press boundary condition, and sample upstream water injection hole 5 use of oil cylinder 12 and cushion block 15 the insides, sample upstream are connected without the PEEK pipe of nuclear magnetic signal; In oil cylinder (12) the inside, have preformed hole 20, it is with sample upstream water injection hole 5, the import 14 of circulation fluid force feed 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 respectively in the groove of clamper end cap 1 and piston 13, can freely dismantle and install; Sample upstream cushion block 15 can be processed into circular or square with the main part of sample downstream cushion block 17, variable-length is moving, for the sample of difformity and size, in addition, the xsect of main part is larger than afterbody xsect, is used for the xial feed that loading piston 13 applies.
Each modular construction:
1, sample upstream cushion block 15, sample downstream cushion block 17:
As shown in 1, sample upstream/downstream cushion block 15/17 is by high-strength, anticorrosion, form without the PEEK materials processing of nuclear magnetic signal; Afterbody is processed into cylinder plugs, inserts respectively in the Baltimore groove of clamper end cap 1 and piston 13, is easy for installation and removal; Be processed into as required right cylinder or rectangular parallelepiped with the shape of core sample 16 contact portions, thereby be applicable to the core sample 16 of difformity, different size; In the middle of cushion block, be processed with tiny circular hole, sample upstream water injection hole 5 and sample downstream water injection hole 3, be connected with external pump, can inject fluid or apply the boundary condition of seepage flow to sample.
2, stack shell 4:
As shown in Figure 1, stack shell 4 is by high-strength, anticorrosion, form without the PEEK materials processing of nuclear magnetic signal, and two ends are connected with fixing form stifled 2, oil cylinder 12 use screw threads respectively, to core sample 16, provide an airtight confined pressure environment.
3, oil cylinder 12, piston 13:
As Figure 1-Figure 4, oil cylinder 12 is for providing xial feed to core sample 16, being processed by stainless steel with piston 13.Oil cylinder upstream oil hole 7 and oil cylinder downstream oil hole 6 are located at oil cylinder 12 1 sides, are connected with external pump oil pump.Hydraulic oil injects oil cylinder 12 by oil cylinder upstream oil hole 7, promotes piston 13 and advances, thereby apply xial feed to core sample 16.When piston 13 advances, the hydraulic oil in oil cylinder is discharged from oil cylinder downstream oil hole 6, meanwhile, also can toward oil cylinder injection liquid force feed, make piston 13 backhauls from here.
As shown in Fig. 1, Fig. 6, the same section of oil cylinder 12 is processed with sample upstream water injection hole 5, circulation fluid force feed import 14 and 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, thereby makes the through core sample 16 of fluid of extraneous pump.Circulation fluid force feed outlet 18 in circulation fluid force feed import 14, fixing stifled 2 is connected with external circulation hydraulic pressure heating temperature control device, applies confined pressure and heating temperature control to core sample 16.Preformed hole 20 can be used as standby filling orifice.
4, displacement transducer pillar 9, pressure lever type displacement transducer 10:
As Figure 1-Figure 4, displacement transducer pillar 9 and pressure lever type displacement transducer 10 are used for measuring the axial displacement of core sample in loading procedure (16).
5, clamper end cap 1, fixing stifled 2:
As shown in Figure 1 and Figure 5, clamper end cap 1 is connected with fixing stifled 2 use bolts 19.
Two, installation method
1. allow core sample 16, sample upstream cushion block 15 and the 17 adjacent docking of sample downstream cushion block, and three's center line is consistent, then put outside heat-shrink tube, and it is fastening with heat gun, to make it pyrocondensation.
2. piston 13 is pushed into oil cylinder 12 bottoms, and oil cylinder 12 is upright, make the Baltimore groove of piston 13 upward.
3. the core sample and cushion block that 1. step assembles is upright, and in the latch of sample upstream cushion block 15 insertion piston 13 Baltimore grooves.
4. stack shell 4 is installed, is tightened being threaded between stack shell 4 and oil cylinder 12.
5. install fixing stifled 2, tighten fixing stifled 2 with stack shell 4 between be threaded.
6. installing holder end cap 1, tighten fixing stifled 2 with clamper end cap 1 between bolt be connected.
7. from oil cylinder upstream oil hole 7 injection liquid force feeds, promote piston 13 and advance, apply a less axial compression to core sample 16, fastening to guarantee core sample 16 installations.
Three, the calculating of core sample axial stress
Core sample axial stress is calculated by following formula:
Wherein:
σ
rock core-core sample axial stress
σ
oil cylinder-oil cylinder upstream oil pressure
S
on-oil cylinder upstream hydraulic oil and piston contact area
σ
confined pressure-core sample confined pressure
S
under-stack shell inner loop hydraulic pressure oil bath piston contact area
σ
oil cylinder, σ
confined pressurecan directly read according to external sensor S
on, S
underfor equipment constant.
Claims (4)
1. the Multifunctional core clamp holder of a rock core Scaling Kernel magnetic resonance experiments, comprise clamper end cap (1), fixing stifled (2), stack shell (4), displacement transducer pillar (9), pressure lever type displacement transducer (10), O-ring seal (11), oil cylinder (12), piston (13), sample upstream cushion block (15), core sample (16), sample downstream cushion block (17), it is characterized in that: clamper end cap (1) is connected with bolt (19) with fixing stifled (2), circulation fluid force feed outlet (18) is fixing stifled (2) inner perforate, fixing stifled (2) are connected with stack shell (4), stack shell (4) is connected with oil cylinder (12), oil cylinder downstream oil hole (6), oil cylinder upstream oil hole (7) and circulation fluid force feed import (14) are the inner perforate of oil cylinder (12), oil cylinder (12) is connected with cylinder cover (8), and sealed by O-ring seal (11), sample upstream water injection hole (5) is the inner perforate of sample upstream cushion block (15), sample upstream cushion block (15) directly inserts piston (13), sample downstream water injection hole (3) is the inner perforate of sample downstream cushion block (17), sample downstream cushion block (17) directly inserts clamper end cap (1), core sample (16) is placed between sample upstream cushion block (15) and sample downstream cushion block (17), by covering the heat-shrink tube of three parts surfaces, connect, displacement transducer pillar (9) is connected with piston (13), displacement transducer pillar (9) is connected with pressure lever type displacement transducer (10).
2. by the Multifunctional core clamp holder of a kind of rock core Scaling Kernel magnetic resonance experiments claimed in claim 1, it is characterized in that: described stack shell (4), sample upstream cushion block (15) and sample downstream cushion block (17) all adopt the high-strength PEEK materials processing without nuclear magnetic signal to form.
3. by the Multifunctional core clamp holder of a kind of rock core Scaling Kernel magnetic resonance experiments claimed in claim 1, it is characterized in that: described circulation fluid force feed import (14) and circulation fluid force feed outlet (18) and external heating, pressurized circulation system connects, oil cylinder upstream oil hole (7) is connected with external pump, oil cylinder downstream oil hole (6) is connected with external pump, sample downstream water injection hole (3), sample upstream water injection hole (5) is connected with external pump, oil cylinder (12) uses the PEEK pipe without nuclear magnetic signal to be connected with the sample upstream water injection hole (5) of sample upstream cushion block (15) the inside.
4. by the Multifunctional core clamp holder of a kind of rock core Scaling Kernel magnetic resonance experiments claimed in claim 1, it is characterized in that: described sample upstream cushion block (15) is processed into barrel band with the afterbody of sample downstream cushion block (17), insert respectively in the groove of clamper end cap (1) and piston (13), sample upstream cushion block (15) is processed into circular or square with sample downstream cushion block (17).
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