CN104122187B - Sine pressure wave succusion ultralow permeability analyzer - Google Patents
Sine pressure wave succusion ultralow permeability analyzer Download PDFInfo
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Abstract
The invention provides a kind of sine pressure wave succusion ultralow permeability analyzer, including three axial compressive force core holding units (2), rock core (3), sinusoidal pressure wave producer (4), vacuum pump system (5), pressure of foundation force (forcing) pump (6), ring pressure/axial compression force (forcing) pump (7), microcomputer (8) and definite value container (9).The sine pressure wave succusion ultralow permeability analyzer of the present invention has the following technical effect that measuring accuracy height, stable performance, repeatable accuracy is high, test speed is fast, easy to operate simply, and the mensuration for rock core ultralow permeability solves a difficult problem.
Description
Technical field
The present invention relates to a kind of sine pressure wave succusion ultralow permeability analyzer, belong to oil equipment technical field.
Background technology
The mensuration of the ultralow permeability of rock core is a generally acknowledged difficult problem, and people are trying to explore, seeking a kind of desirably test instrunment.
The instrument being currently used for permeability determination has following weak point:
1) it is currently used for the instrument of permeability determination to be typically all and follow Darcy's law and design and develop.And brainstrust thinks that ultralow permeability has deviated from Darcy's law, and minute is oversize, and such environmental effects is too big, and therefore its test result is not ideal.
2) pulse attenuation method is a kind of method for ultralow permeability test acknowledged at present.But also due to pressure pulse equilibration time in attenuation process is long, such environmental effects is too big and causes that test data are unstable.
3) instrument of ultralow permeability is measured by sine pressure wave succusion, everybody is in exploration, current instrument has the disadvantage in that A, the feature do not vibrated for sine pressure wave design special core holding unit, and the conventional rock core holder used when being the use of oil field scientific experiments, cause test data distortion.B, not having specialized designs sine pressure wave to send out device, but replace with pressure of foundation force (forcing) pump, the precision causing sine pressure wave is very poor.C, sine pressure wave send out the device upstream extremity to rock core, namely the pipeline between this instrument floating plug side is connected to some devices, cause this part pipeline oversize too complicated, this is passed through the attenuation change of this partial devices and pipeline with regard to the pressure wave that precision is not high, make the amplitude of ripple, phase place and form very unstable.D, in the downstream of rock core, namely the fixing plug end of this instrument, is connected to the device such as Pressure gauge, back-pressure valve, causes this part pipeline oversize too complicated, causes that the total pore volume of this part is little not to get off.E, detection rock core upstream and downstream both ends of the surface pressure wave the pressure transducer two ends from rock core too remote, pipeline is oversize, and its detected pressure wave information differs bigger with the actual pressure ripple information of rock core both ends of the surface.F, in pipeline flow process, it is configured without vacuum pump system, make that flow process pipeline has residual gas, because gas compressibility is relatively big, the volume of this residual gas fraction can along with the change in pressure in instrument flow process pipeline, and this pressure wave allowing for tested rock core two ends loses verity.
Summary of the invention
In order to overcome the deficiencies in the prior art part, the invention provides a kind of sine pressure wave succusion ultralow permeability analyzer.
The sine pressure wave succusion ultralow permeability analyzer of the present invention, including three axial compressive force core holding units (2), rock core (3), sinusoidal pressure wave producer (4), vacuum pump system (5), pressure of foundation force (forcing) pump (6), ring pressure/axial compression force (forcing) pump (7), microcomputer (8) and definite value container (9)
Three described axial compressive force core holding units include floating plug (2-1), fixing plug (2-2), piston (2-3), pressure cap (2-4), gum cover (3-1) and steel bushing (3-2), described floating plug (2-1) and fixing plug (2-2) are separately fixed on piston (2-3) and pressure cap (2-4), the outlet of described floating plug (2-1) is connected by pipeline with the outlet of fixing plug (2-2), and centre is in series with ball valve (11)；
There is an aperture at floating plug (2-1) center of three described axial compressive force core holding units (2), aperture one end is horn shape, described horn mouth is adjacent to rock core (3), the described aperture other end is connected with the first pressure transducer (10-1), described aperture is provided with an outlet, described outlet is by pipeline and sinusoidal pressure wave producer (4), vacuum pump system (5) is connected with pressure of foundation force (forcing) pump (6), it is in series with the first stop valve (1-1) between described vacuum pump system (5) and floating plug (2-1) export pipeline, it is in series with the 3rd stop valve (1-3) between described pressure of foundation force (forcing) pump (6) and floating plug (2-1) export pipeline, this section of pipeline is connected with the second stop valve (1-2) as atmospheric valve, the exit of described pressure of foundation force (forcing) pump (6) is also connected with relief valve (12) and the 3rd pressure transducer (10-3)；
There is an aperture at fixing plug (2-2) center of three described axial compressive force core holding units (2), described aperture one end is horn shape, described horn mouth is adjacent to rock core (3), the other end of described aperture is connected with the second pressure transducer (10-2), described aperture is provided with an outlet, and described outlet is connected with definite value container (9) and ball valve (11) by pipeline；
Described rock core (3) is located in three axial compressive force core holding units (2), the left end of rock core (3) is connected with floating plug (2-1), the right-hand member of rock core (3) is connected with fixing plug (2-2), the external diameter of rock core (3) encloses gum cover (3-1), the external diameter of described gum cover (3-1) overlaps steel bushing (3-2), a mezzanine space is had between described steel bushing (3-2) and gum cover (3-1), described mezzanine space is connected by pipeline with the exit of ring pressure/axial compression force (forcing) pump (7), the 4th stop valve (1-4) it is in series with in the middle of described pipeline, the exit of described ring pressure/axial compression force (forcing) pump (7) is also connected with relief valve (12), 4th pressure transducer (10-4) and the second atmospheric valve (1-5)；
Described ring pressure/axial compression force (forcing) pump (7), pressure of foundation force (forcing) pump (6) are connected with microcomputer (8) respectively with sinusoidal pressure wave producer (4), being subject to the control of microcomputer (8) respectively, described the first pressure transducer (10-1), the second pressure transducer (10-2), the 3rd pressure transducer (10-3) and the 4th pressure transducer (10-4) can transmit pressure information to microcomputer respectively.
Preferably,
Described floating plug (2-1) and fixing plug (2-2) are separately fixed on piston (2-3) and pressure cap (2-4) by the type of attachment of quick bayonet socket；
Described rock core is the rock core of regular shape.
Described rock core is column rock core.
The sine pressure wave succusion ultralow permeability analyzer of the present invention, has the following technical effect that
1) special core holding unit is devised.
This special core holding unit, it must possess: ring pressure pressure that common core holding unit possesses seals reliable, and rock core upstream pressure and downstream pressure seal reliably respectively, the upstream and downstream pressure of rock core not crossfire on rock core circumference；Must also possessing: the necessary absolute stability in rock core position in clamper, when the upstream face of rock core bears the two-way pressure fluctuation of about 20MPa, must not there is a bit fluctuation produced because of the reason of core holding unit in the downstream end face pressure of rock core.Can truly, in time, accurately reflect the extremely faint pressure wave of pressure wave, particularly rock core downstream of rock core both ends of the surface.
Therefore following measures is taken when designing new rock core fastener:
A, with the addition of a piston to core holding unit, be fixed on piston by the connected mode of floating plug bayonet socket, piston drives the displacement together of floating plug when doing axial displacement under the effect of axial compressive force, with the addition of a stable axial force to rock core.
B, floating plug and fixing plug and the joint portion employing horn mouth shape of rock core both ends of the surface, allow the both ends of the surface of rock core come out to greatest extent, be beneficial to sensing and the transmission of pressure wave.
C, floating plug endoporus relatively larger, the transmission of favourable rock core forefront pressure ripple.The endoporus of fixing plug is smaller, is conducive to controlling the cumulative volume in the fixing plug of rock core downstream and pipeline endoporus space.
D, floating plug and fixing plug respectively with piston and pressure cap in conjunction with time, all have employed the quick-opening structure of bayonet type so that rock core easy to loading and unloading fast.
2) two pressure transducers for measuring rock core both ends of the surface pressure wave are directly installed on floating plug and fixing plug respectively, accept and transmit the pressure wave information at rock core two ends the most directly, truly, in time.
3) specialized designs sinusoidal pressure wave producer, makes the precision of sine pressure wave reach 5/10000ths.
4) sinusoidal pressure wave producer is between three axial compressive force core holding unit floating plugs, it does not have connect other devices, direct-connected with the shortest pipeline, it is ensured that to receive the most original pressure wave on the end face of rock core.
5) downstream of rock core is eliminated, namely part pipeline and the device of this one end of plug are fixed, by ball valve and definite value container against fixing plug, decrease the pipe joint of this part to greatest extent, decrease the internal pore volume of this part pipeline to greatest extent, ensure that the space cumulative volume in rock core downstream is minima, thus improve the sensitivity of rock core downstream pressure ripple reaction.
6) with the addition of vacuum pump system to instrument, eliminate the residual gas in pipeline flow process, it is ensured that the verity of rock core pressure at two ends ripple.
7) connected a ball valve in the middle of the pipeline that the fixing plug outlet of three axial compressive force core holding units and the outlet of floating plug connect.In instrument work process, after pressure of foundation adds and stablizes, the pressure of rock core both ends of the surface is balance, now needs to close valve, cuts off and connect, and can not affect the balance of rock core pressure at two ends, and ball valve is most suitable.
By improvement every above, the sine pressure wave succusion ultralow permeability analyzer making the present invention has the following technical effect that measuring accuracy height, stable performance, repeatable accuracy is high, test speed is fast, easy to operate simply, and the mensuration for rock core ultralow permeability solves a difficult problem.
Accompanying drawing explanation
Fig. 1 is the structural representation of the sine pressure wave succusion ultralow permeability analyzer of the present invention；
Fig. 2 is the sinusoidal pressure waveform of tested rock core；
Fig. 3 is image and the data process figure of tested rock core；
Fig. 4 is rock core experiment real-time waveform figure in mensuration process on the sine pressure wave succusion ultralow permeability analyzer of the present invention；
Fig. 5 is that rock core data in mensuration process on the sine pressure wave succusion ultralow permeability analyzer of the present invention process figure；
Fig. 6 rock core is the data report of the test result in mensuration process on the sine pressure wave succusion ultralow permeability analyzer of the present invention；
Fig. 7 is the data report of the test result that same rock core steady state method measures.
Wherein, 1-1 is the first stop valve, 1-2 is the second stop valve, 1-3 is the 3rd stop valve, 1-4 is the 4th stop valve, 1-5 is the second atmospheric valve, 2 is three axial compressive force core holding units, 2-1 is floating plug, 2-2 is fixing plug, 2-3 is piston, 2-4 is pressure cap, 3 is rock core, 3-1 is gum cover, 3-2 is steel bushing, 4 is sinusoidal pressure wave producer, 5 is vacuum pump system, pressure force (forcing) pump based on 6, 7 is ring pressure/axial compression force (forcing) pump, 8 is microcomputer, 9 is definite value container, 10-1 is the first pressure transducer, 10-2 is the first pressure transducer, 10-3 is the first pressure transducer, 10-4 is the first pressure transducer, 11 is ball valve, 12 is relief valve.
Detailed description of the invention
As shown in Figure 1, the sine pressure wave succusion ultralow permeability analyzer of the present invention, including three axial compressive force core holding units (2), column rock core (3), sinusoidal pressure wave producer (4), vacuum pump system (5), pressure of foundation force (forcing) pump (6), ring pressure/axial compression force (forcing) pump (7), microcomputer (8) and definite value container (9)
Three described axial compressive force core holding units include floating plug (2-1), fixing plug (2-2), piston (2-3), pressure cap (2-4), gum cover (3-1) and steel bushing (3-2), described floating plug (2-1) and fixing plug (2-2) are separately fixed at by the type of attachment of quick bayonet socket on piston (2-3) and pressure cap (2-4), the outlet of described floating plug (2-1) is connected by pipeline with the outlet of fixing plug (2-2), and centre is in series with ball valve (11)；
There is an aperture at floating plug (2-1) center of three described axial compressive force core holding units (2), aperture one end is horn shape, described horn mouth is adjacent to rock core (3), the described aperture other end is connected with the first pressure transducer (10-1), described aperture is provided with an outlet, described outlet is by pipeline and sinusoidal pressure wave producer (4), vacuum pump system (5) is connected with pressure of foundation force (forcing) pump (6), it is in series with the first stop valve (1-1) between described vacuum pump system (5) and floating plug (2-1) export pipeline, it is in series with the 3rd stop valve (1-3) between described pressure of foundation force (forcing) pump (6) and floating plug (2-1) export pipeline, this section of pipeline is connected with the second stop valve (1-2) as atmospheric valve, the exit of described pressure of foundation force (forcing) pump (6) is also connected with relief valve (12) and the 3rd pressure transducer (10-3)；
There is an aperture at fixing plug (2-2) center of three described axial compressive force core holding units (2), described aperture one end is horn shape, described horn mouth is adjacent to rock core (3), the other end of described aperture is connected with the second pressure transducer (10-2), described aperture is provided with an outlet, and described outlet is connected with definite value container (9) and ball valve (11) by pipeline；
Described rock core (3) is located in three axial compressive force core holding units (2), the left end of rock core (3) is connected with floating plug (2-1), the right-hand member of rock core (3) is connected with fixing plug (2-2), the external diameter of rock core (3) encloses gum cover (3-1), the external diameter of described gum cover (3-1) overlaps steel bushing (3-2), a mezzanine space is had between described steel bushing (3-2) and gum cover (3-1), described mezzanine space is connected by pipeline with the exit of ring pressure/axial compression force (forcing) pump (7), the 4th stop valve (1-4) it is in series with in the middle of described pipeline, the exit of described ring pressure/axial compression force (forcing) pump (7) is also connected with relief valve (12), 4th pressure transducer (10-4) and the second atmospheric valve (1-5)；
Described ring pressure/axial compression force (forcing) pump (7), pressure of foundation force (forcing) pump (6) are connected with microcomputer (8) respectively with sinusoidal pressure wave producer (4), being subject to the control of microcomputer (8) respectively, described the first pressure transducer (10-1), the second pressure transducer (10-2), the 3rd pressure transducer (10-3) and the 4th pressure transducer (10-4) can transmit pressure information to microcomputer respectively.
The sine pressure wave succusion ultralow permeability analyzer Applicable media of the present invention is liquid.Work process is as follows:
1) loading in three axial compressive force core holding units by rock core 3 to be measured, floating plug 2-1 and fixing plug 2-2 is adjacent to rock core 3 both ends of the surface respectively.
2) open the 4th stop valve 1-4, open ring pressure/axial compression force (forcing) pump 7, add ring pressure and axial compression to three axial compressive force core holding units 2.
3) permeability range according to estimation, adjusts the spatial value of definite value container 9.
4) ball valve the 11, first stop valve 1-1, the 3rd stop valve 1-3 are opened, open vacuum pump system 5, to pressure of foundation force (forcing) pump 6, sinusoidal pressure wave producer 4, definite value container 9, three axial compressive force core holding unit 2, and all connecting line evacuation between said apparatus.
5) after certain vacuum degree to be achieved, close the first stop valve 1-1, close vacuum pump system 5.
6) starting pressure of foundation force (forcing) pump 6, to sinusoidal pressure wave producer 4, definite value container 9, triaxial core holder 2, and between said apparatus, connecting line etc. adds a pressure of foundation.
7) close the 3rd stop valve 1-3, after pressure of foundation is stable, close ball valve 11.
8) start sinusoidal pressure wave producer 4, make rock core 3 produce the sine pressure wave vibrated up and down around pressure of foundation with floating plug 2-1 this side end face being connected.This sine pressure wave through the infiltration of rock core and decay, make the end face of rock core 2 and fixing plug 2-2 this side being connected produce a wave amplitude reduce, the sine pressure wave of Phase delay.
9) the sine pressure wave information of rock core 3 both ends of the surface is transferred to microcomputer 8 by the first pressure transducer 10-1 on three axial compressive force core holding unit floating plug 2-1 and the second pressure transducer 10-2 on fixing plug 2-2 respectively, now there will be the sinusoidal pressure waveform picture that is coordinate in length and breadth with pressure and time in the screen of microcomputer 8.On picture, the sinusoidal pressure wavy curve of rock core 3 both ends of the surface, color is different, overlapped.(referring to Fig. 2)
10) microcomputer 8 carries out data and image procossing, has drawn tested rock core both ends of the surface, the amplitude ratio of sinusoidal pressure waveform and phase contrast, has drawn the permeability value of tested rock core.(referring to Fig. 3)
11) owing to being a kind of new method by sine pressure wave succusion mensuration ultralow permeability, there is presently no an acknowledged ruler and weigh.We use the method for testing that sine pressure wave succusion is two kinds different with steady state method, same rock core has been parallel contrast experiment, Fig. 4, Fig. 5, Fig. 6 are above-mentioned rock core data reports of the experiment real-time waveform figure in mensuration process and test result on this instrument, and Fig. 7 is the data report of the test result that above-mentioned rock core steady state method measures.Can be seen that from two data reports, test result substantially identical.
Claims (3)
1. sine pressure wave succusion ultralow permeability analyzer, it is characterized in that, including three axial compressive force core holding units (2), rock core (3), sinusoidal pressure wave producer (4), vacuum pump system (5), pressure of foundation force (forcing) pump (6), ring pressure/axial compression force (forcing) pump (7), microcomputer (8) and definite value container (9)
Three described axial compressive force core holding units include floating plug (2-1), fixing plug (2-2), piston (2-3), pressure cap (2-4), gum cover (3-1) and steel bushing (3-2), described floating plug (2-1) and fixing plug (2-2) are separately fixed on piston (2-3) and pressure cap (2-4), the outlet of described floating plug (2-1) is connected by pipeline with the outlet of fixing plug (2-2), and centre is in series with ball valve (11)；
There is an aperture at floating plug (2-1) center of three described axial compressive force core holding units (2), aperture one end is horn shape, described horn mouth is adjacent to rock core (3), the described aperture other end is connected with the first pressure transducer (10-1), described aperture is provided with an outlet, described outlet is by pipeline and sinusoidal pressure wave producer (4), vacuum pump system (5) is connected with pressure of foundation force (forcing) pump (6), it is in series with the first stop valve (1-1) between described vacuum pump system (5) and floating plug (2-1) export pipeline, it is in series with the 3rd stop valve (1-3) between described pressure of foundation force (forcing) pump (6) and floating plug (2-1) export pipeline, this section of pipeline is connected with the second stop valve (1-2) as atmospheric valve, the exit of described pressure of foundation force (forcing) pump (6) is also connected with relief valve (12) and the 3rd pressure transducer (10-3)；
There is an aperture at fixing plug (2-2) center of three described axial compressive force core holding units (2), described aperture one end is horn shape, described horn mouth is adjacent to rock core (3), the other end of described aperture is connected with the second pressure transducer (10-2), described aperture is provided with an outlet, and described outlet is connected with definite value container (9) and ball valve (11) by pipeline；
Described rock core (3) is located in three axial compressive force core holding units (2), the left end of rock core (3) is connected with floating plug (2-1), the right-hand member of rock core (3) is connected with fixing plug (2-2), the external diameter of rock core (3) encloses gum cover (3-1), the external diameter of described gum cover (3-1) overlaps steel bushing (3-2), a mezzanine space is had between described steel bushing (3-2) and gum cover (3-1), described mezzanine space is connected by pipeline with the exit of ring pressure/axial compression force (forcing) pump (7), the 4th stop valve (1-4) it is in series with in the middle of described pipeline, the exit of described ring pressure/axial compression force (forcing) pump (7) is also connected with relief valve (12), 4th pressure transducer (10-4) and the second atmospheric valve (1-5)；
Described ring pressure/axial compression force (forcing) pump (7), pressure of foundation force (forcing) pump (6) are connected with microcomputer (8) respectively with sinusoidal pressure wave producer (4), being subject to the control of microcomputer (8) respectively, described the first pressure transducer (10-1), the second pressure transducer (10-2), the 3rd pressure transducer (10-3) and the 4th pressure transducer (10-4) can transmit pressure information to microcomputer respectively；
Described floating plug (2-1) and fixing plug (2-2) are separately fixed on piston (2-3) and pressure cap (2-4) by the type of attachment of quick bayonet socket.
2. sine pressure wave succusion ultralow permeability analyzer according to claim 1, it is characterised in that described rock core is the rock core of regular shape.
3. sine pressure wave succusion ultralow permeability analyzer according to claim 2, it is characterised in that described rock core is column rock core.
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| CN105300866A (en) * | 2015-10-12 | 2016-02-03 | 中国石油天然气股份有限公司 | Dual-medium and long-core experimental method for variable-pressure soaking |
| CN105242027B (en) * | 2015-10-30 | 2017-03-29 | 南通市飞宇石油科技开发有限公司 | A kind of true triaxial core holding unit |
| CN106442254A (en) * | 2016-09-06 | 2017-02-22 | 武汉理工大学 | Hypotonic rock seepage parameter determining method based on water pressure oscillating method |
| CN106290118A (en) * | 2016-10-26 | 2017-01-04 | 中国科学院武汉岩土力学研究所 | Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect |
| CN107014735A (en) * | 2017-05-16 | 2017-08-04 | 绍兴文理学院 | A kind of multifunctional rock crack infiltration experiment system |
| CN109580454B (en) * | 2019-01-05 | 2022-02-08 | 中国海洋石油集团有限公司 | Method for testing fluid sensitivity of tight reservoir by using pressure oscillation method |
| CN110057686A (en) * | 2019-05-15 | 2019-07-26 | 江苏拓创科研仪器有限公司 | Cover pressure three axle clamp holder of analyzer |
| CN110346449A (en) * | 2019-05-24 | 2019-10-18 | 南通市中京机械有限公司 | Sound wave clamper |
| CN115343155A (en) * | 2022-08-12 | 2022-11-15 | 西安石油大学 | Physical property evolution simulation device for tight oil reservoir |
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