CN104122187A - Ultra-low permeability measurer adopting sine pressure wave oscillation method - Google Patents

Ultra-low permeability measurer adopting sine pressure wave oscillation method Download PDF

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Publication number
CN104122187A
CN104122187A CN201410385203.7A CN201410385203A CN104122187A CN 104122187 A CN104122187 A CN 104122187A CN 201410385203 A CN201410385203 A CN 201410385203A CN 104122187 A CN104122187 A CN 104122187A
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pressure
rock core
pump
plug
forcing
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CN201410385203.7A
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Chinese (zh)
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CN104122187B (en
Inventor
钱荣兴
钱如树
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海安华达石油仪器有限公司
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Abstract

The invention provides an ultra-low permeability measurer adopting a sine pressure wave oscillation method. The ultra-low permeability measurer comprises a triaxial pressure rock core clamp (2), a rock core (3), a sine pressure wave generator (4), a vacuum pump system (5), a basic pressure boosting pump (6), an annular pressure/axial pressure boosting pump (7), a microcomputer (8) and a fixed-value container (9). The ultra-low permeability measurer adopting the sine pressure wave oscillation method has the technical effects of high test precision, stable performance, high repeating precision, high test speed and convenience and simplicity for operation, and the difficulty in measuring the ultra-low permeability of the rock core is solved.

Description

Sine pressure wave succusion ultra-low penetration rate analyzer
Technical field
The present invention relates to a kind of sine pressure wave succusion ultra-low penetration rate analyzer, belong to oil equipment technical field.
Background technology
The mensuration of the ultra-low penetration rate of rock core is a generally acknowledged difficult problem, and people are trying to explore, seeking a kind of desirable testing tool.
At present there is following weak point for the instrument of permeability determination:
1) generally all follow Darcy's law and design and develop for the instrument of permeability determination at present.And brainstrust thinks that ultra-low penetration rate has deviated from Darcy's law, and minute is oversize, and such environmental effects is too large, and therefore its test result is not ideal.
2) pulse attenuation method is the at present acknowledged a kind of method for the test of ultra-low penetration rate.But also because pressure pulse equilibration time in attenuation process is long, such environmental effects causes test data unstable too greatly.
3) use sine pressure wave succusion to measure the instrument of ultra-low penetration rate, everybody is in exploration, there is following shortcoming: A, do not design special core holding unit for the feature of sine pressure wave vibration in current instrument, but the conventional core clamper using while having used oil field scientific experiment causes test data distortion.B, there is no specialized designs sine pressure wave hair device, but replace with pressure of foundation force (forcing) pump, cause the precision of sine pressure wave very poor.C, sine pressure wave hair device are to the upstream extremity of rock core, be to have connected some devices in the pipeline between unsteady plug one side of this instrument, cause this part pipeline oversize too complicated, with regard to not high this part device of pressure wave process of precision and the attenuation change of pipeline, make wave amplitude, phase place and form very unstable this.D, in the downstream end of rock core, the fixing plug end of this instrument, has connected the device such as tensimeter, check valve, causes this part pipeline oversize too complicated, causes that this part hole cumulative volume is little not to get off.The pressure transducer of E, detection rock core upstream and downstream both ends of the surface pressure wave is too far away apart from the two ends of rock core, and pipeline is oversize, and the actual pressure ripple information of its detected pressure wave information and rock core both ends of the surface differs larger.F, in pipeline flow process, there is no vacuum pump system, making has residual gas in flow process pipeline, because gas compressibility is larger, the volume of this part residual gas can be along with the change in pressure in instrument flow process pipeline, and this has lost authenticity with regard to the pressure wave that makes tested rock core two ends.
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 ultra-low penetration rate analyzer.
Sine pressure wave succusion ultra-low penetration rate analyzer of the present invention, comprise three axle pressure 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 axle pressure core holding units comprise unsteady plug (2-1), fixing plug (2-2), piston (2-3), pressure cap (2-4), gum cover (3-1) and steel bushing (3-2), described unsteady plug (2-1) and fixing plug (2-2) are separately fixed on piston (2-3) and pressure cap (2-4), the outlet of described unsteady plug (2-1) and the outlet of fixing plug (2-2) are connected by pipeline, and centre is in series with ball valve (11);
There is an aperture at unsteady plug (2-1) center of three described axle pressure core holding units (2), aperture one end is horn shape, described hydraucone 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), between described vacuum pump system (5) and unsteady plug (2-1) export pipeline, be in series with the first stop valve (1-1), between described pressure of foundation force (forcing) pump (6) and unsteady plug (2-1) export pipeline, be in series with the 3rd stop valve (1-3), 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 safety valve (12) and the 3rd pressure transducer (10-3),
There is an aperture at fixing plug (2-2) center of three described axle pressure core holding units (2), described aperture one end is horn shape, described hydraucone 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 axle pressure core holding units (2), the left end of rock core (3) is connected with unsteady plug (2-1), the right-hand member of rock core (3) is connected with fixing plug (2-2), on the external diameter of rock core (3), wrapping gum cover (3-1), on the external diameter of described gum cover (3-1), overlapping steel bushing (3-2), between described steel bushing (3-2) and gum cover (3-1), there is a mezzanine space, described mezzanine space is connected by pipeline with the exit of ring pressure/axial compression force (forcing) pump (7), in the middle of described pipeline, be in series with the 4th stop valve (1-4), the exit of described ring pressure/axial compression force (forcing) pump (7) is also connected with safety valve (12), the 4th pressure transducer (10-4) and atmospheric valve (1-5),
Described ring pressure/axial compression force (forcing) pump (7), pressure of foundation force (forcing) pump (6) and sinusoidal pressure wave producer (4) are connected with microcomputer (8) respectively, be subject to respectively the control of microcomputer (8), 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 be respectively to microcomputer transmission pressure information.
Preferably,
Described unsteady 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.
Sine pressure wave succusion ultra-low penetration rate analyzer of the present invention, has following technique effect:
1) designed special core holding unit.
The core holding unit that this is special, it must possess: the sealing of ring pressure pressure that common core holding unit possesses is reliable, and rock core upstream pressure and downstream pressure seal respectively reliably, the upstream and downstream pressure of rock core crossfire not on rock core circumference; Also must possess: the necessary absolute stability in the position of rock core in clamper, in the time that the upstream face of rock core is born the pressure surge up and down of 20MPa left and right, a bit fluctuation because of the former of core holding unit thereby generation must not appear in the downstream end face pressure of rock core.Can truly, in time, accurately reflect the extremely faint pressure wave of the pressure wave, particularly rock core downstream of rock core both ends of the surface.
Therefore in the time designing new rock core fastener, taked following measures:
A, add a piston to core holding unit, unsteady plug has been fixed on piston by the connected mode of bayonet socket, when piston does axial displacement under the effect of axle pressure, driven the plug displacement together of floating, added a stable axial force to rock core.
The joint portion of B, float plug and fixing plug and rock core both ends of the surface adopts hydraucone shape, allows the both ends of the surface of rock core come out to greatest extent, is beneficial to induction and the transmission of pressure wave.
The endoporus of C, the plug that floats is larger, the transmission of favourable rock core forefront pressure ripple.The endoporus of fixing plug is smaller, is conducive to control the cumulative volume in the fixing plug of rock core downstream end and pipeline endoporus space.
D, unsteady plug and fixing plug in the time that piston and pressure cap are combined, have all adopted the quick-opening structure of bayonet type respectively, make the easy to loading and unloading quick of rock core.
2) be directly installed on respectively for measuring two pressure transducers of rock core both ends of the surface pressure wave float plug and fixing plug, accept the most directly, truly, in time and transmit the pressure wave information at rock core two ends.
3) specialized designs sinusoidal pressure wave producer, make the precision of sine pressure wave reach 5/10000ths.
4) sinusoidal pressure wave producer to three axle pressure core holding unit floats between plug, does not connect other devices, direct-connected with the shortest pipeline, ensures to receive the most original pressure wave on the end face of rock core.
5) removed the downstream end of rock core, fix part pipeline and the device of this one end of plug, by ball valve and definite value container near fixing plug, reduce to greatest extent the pipe joint of this part, reduce to greatest extent the internal pore volume of this part pipeline, the space cumulative volume that has ensured rock core downstream is minimum value, thereby has improved the sensitivity of rock core downstream pressure ripple reaction.
6) add vacuum pump system to instrument, removed the residual gas in pipeline flow process, ensured the authenticity of rock core pressure at two ends ripple.
7) the fixing plug outlet of three axle pressure core holding units exports the middle ball valve of having connected of the pipeline being connected with the plug that floats.In the instrument course of work, after pressure of foundation interpolation is stable, the pressure of rock core both ends of the surface is balances, now needs valve-off, cuts off and connects, and can not affect the balance of rock core pressure at two ends, and ball valve is most suitable.
By above every improvement, make sine pressure wave succusion ultra-low penetration rate internal measuring instrument of the present invention have following technique effect: measuring accuracy is high, stable performance, repeatable accuracy is high, test speed is fast, easy to operate simple, for the mensuration of rock core ultra-low penetration rate has solved a difficult problem.
Brief description of the drawings
Fig. 1 is the structural representation of sine pressure wave succusion ultra-low penetration rate analyzer of the present invention;
Fig. 2 is the sinusoidal pressure waveform of tested rock core;
Fig. 3 is image and the data processing figure of tested rock core;
Fig. 4 is rock core experiment real-time waveform figure in mensuration process on sine pressure wave succusion ultra-low penetration rate analyzer of the present invention;
Fig. 5 is rock core data processing figure in mensuration process on sine pressure wave succusion ultra-low penetration rate analyzer of the present invention;
The data report of Fig. 6 rock core test result in mensuration process on sine pressure wave succusion ultra-low penetration rate analyzer of the present invention;
Fig. 7 is the data report of the test result of same rock core steady state method mensuration.
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 atmospheric valve, 2 is three axle pressure core holding units, 2-1 is the plug that floats, 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, 6 is pressure of foundation force (forcing) pump, 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 safety valve.
Embodiment
As shown in Figure 1, sine pressure wave succusion ultra-low penetration rate analyzer of the present invention, comprise three axle pressure 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 axle pressure core holding units comprise unsteady plug (2-1), fixing plug (2-2), piston (2-3), pressure cap (2-4), gum cover (3-1) and steel bushing (3-2), described unsteady 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, the outlet of described unsteady plug (2-1) and the outlet of fixing plug (2-2) are connected by pipeline, and centre is in series with ball valve (11);
There is an aperture at unsteady plug (2-1) center of three described axle pressure core holding units (2), aperture one end is horn shape, described hydraucone 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), between described vacuum pump system (5) and unsteady plug (2-1) export pipeline, be in series with the first stop valve (1-1), between described pressure of foundation force (forcing) pump (6) and unsteady plug (2-1) export pipeline, be in series with the 3rd stop valve (1-3), 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 safety valve (12) and the 3rd pressure transducer (10-3),
There is an aperture at fixing plug (2-2) center of three described axle pressure core holding units (2), described aperture one end is horn shape, described hydraucone 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 axle pressure core holding units (2), the left end of rock core (3) is connected with unsteady plug (2-1), the right-hand member of rock core (3) is connected with fixing plug (2-2), on the external diameter of rock core (3), wrapping gum cover (3-1), on the external diameter of described gum cover (3-1), overlapping steel bushing (3-2), between described steel bushing (3-2) and gum cover (3-1), there is a mezzanine space, described mezzanine space is connected by pipeline with the exit of ring pressure/axial compression force (forcing) pump (7), in the middle of described pipeline, be in series with the 4th stop valve (1-4), the exit of described ring pressure/axial compression force (forcing) pump (7) is also connected with safety valve (12), the 4th pressure transducer (10-4) and atmospheric valve (1-5),
Described ring pressure/axial compression force (forcing) pump (7), pressure of foundation force (forcing) pump (6) and sinusoidal pressure wave producer (4) are connected with microcomputer (8) respectively, be subject to respectively the control of microcomputer (8), 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 be respectively to microcomputer transmission pressure information.
Sine pressure wave succusion ultra-low penetration rate analyzer Applicable media of the present invention is liquid.The course of work is as follows:
1) rock core 3 to be measured is packed in three axle pressure core holding units, float plug 2-1 and fixing plug 2-2 are adjacent to respectively rock core 3 both ends of the surface.
2) open the 4th stop valve 1-4, open ring pressure/axial compression force (forcing) pump 7, adds ring to three axle pressure core holding units 2 and presses and axial compression.
3), according to the permeability range of estimation, adjust the spatial value of definite value container 9.
4) open ball valve 11, the first stop valve 1-1, the 3rd stop valve 1-3, open vacuum pump system 5, give pressure of foundation force (forcing) pump 6, sinusoidal pressure wave producer 4, definite value container 9, three axle pressure core holding units 2, and all connecting lines between said apparatus vacuumize.
5) after reaching certain vacuum degree, close the first stop valve 1-1, close vacuum pump system 5.
6) start pressure of foundation force (forcing) pump 6, give 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, this side end face that rock core 3 is connected with unsteady plug 2-1 produces the sine pressure wave of vibrating up and down around pressure of foundation.This sine pressure wave is through infiltration and the decay of rock core, wave amplitude of end face generation of this side that rock core 2 is connected with fixing plug 2-2 reduced, the sine pressure wave of phase delay.
9) three axle pressure core holding units float the first pressure transducer 10-1 on plug 2-1 and the second pressure transducer 10-2 on fixing plug 2-2 respectively by the sine pressure wave communication of rock core 3 both ends of the surface to microcomputer 8, now in the screen of microcomputer 8, there will be one taking pressure and time as the sinusoidal pressure waveform picture of coordinate in length and breadth.On picture, the sinusoidal pressure waveform curve of rock core 3 both ends of the surface, color difference, overlapped.(referring to Fig. 2)
10) microcomputer 8 carries out data and image processing, has drawn amplitude ratio and the phase differential of tested rock core both ends of the surface, sinusoidal pressure waveform, has drawn the permeability value of tested rock core.(referring to Fig. 3)
11) be a kind of new method owing to measuring ultra-low penetration rate by sine pressure wave succusion, also do not have an acknowledged ruler to weigh at present.We use sine pressure wave succusion and two kinds of different method of testings of steady state method, same rock core has been done to parallel contrast experiment, Fig. 4, Fig. 5, Fig. 6 are the above-mentioned rock core experiment real-time waveform figure in mensuration process and data reports of test result on this instrument, and Fig. 7 is the data report of the test result measured of above-mentioned rock core steady state method.From two data reports, can find out, test result is substantially identical.

Claims (4)

1. sine pressure wave succusion ultra-low penetration rate analyzer, it is characterized in that, comprise three axle pressure 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 axle pressure core holding units comprise unsteady plug (2-1), fixing plug (2-2), piston (2-3), pressure cap (2-4), gum cover (3-1) and steel bushing (3-2), described unsteady plug (2-1) and fixing plug (2-2) are separately fixed on piston (2-3) and pressure cap (2-4), the outlet of described unsteady plug (2-1) and the outlet of fixing plug (2-2) are connected by pipeline, and centre is in series with ball valve (11);
There is an aperture at unsteady plug (2-1) center of three described axle pressure core holding units (2), aperture one end is horn shape, described hydraucone 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), between described vacuum pump system (5) and unsteady plug (2-1) export pipeline, be in series with the first stop valve (1-1), between described pressure of foundation force (forcing) pump (6) and unsteady plug (2-1) export pipeline, be in series with the 3rd stop valve (1-3), 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 safety valve (12) and the 3rd pressure transducer (10-3),
There is an aperture at fixing plug (2-2) center of three described axle pressure core holding units (2), described aperture one end is horn shape, described hydraucone 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 axle pressure core holding units (2), the left end of rock core (3) is connected with unsteady plug (2-1), the right-hand member of rock core (3) is connected with fixing plug (2-2), on the external diameter of rock core (3), wrapping gum cover (3-1), on the external diameter of described gum cover (3-1), overlapping steel bushing (3-2), between described steel bushing (3-2) and gum cover (3-1), there is a mezzanine space, described mezzanine space is connected by pipeline with the exit of ring pressure/axial compression force (forcing) pump (7), in the middle of described pipeline, be in series with the 4th stop valve (1-4), the exit of described ring pressure/axial compression force (forcing) pump (7) is also connected with safety valve (12), the 4th pressure transducer (10-4) and atmospheric valve (1-5),
Described ring pressure/axial compression force (forcing) pump (7), pressure of foundation force (forcing) pump (6) and sinusoidal pressure wave producer (4) are connected with microcomputer (8) respectively, be subject to respectively the control of microcomputer (8), 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 be respectively to microcomputer transmission pressure information.
2. sine pressure wave succusion ultra-low penetration rate analyzer according to claim 1, it is characterized in that, described unsteady 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.
3. sine pressure wave succusion ultra-low penetration rate analyzer according to claim 1, is characterized in that the rock core that described rock core is regular shape.
4. sine pressure wave succusion ultra-low penetration rate analyzer according to claim 3, is characterized in that, described rock core is column rock core.
?
CN201410385203.7A 2014-08-06 2014-08-06 Sine pressure wave succusion ultralow permeability analyzer CN104122187B (en)

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CN105242027A (en) * 2015-10-30 2016-01-13 南通市飞宇石油科技开发有限公司 True triaxial core holder
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
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
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
CN107014735A (en) * 2017-05-16 2017-08-04 绍兴文理学院 A kind of multifunctional rock crack infiltration experiment system
CN109580454A (en) * 2019-01-05 2019-04-05 中国海洋石油集团有限公司 A method of compact reservoir Fluid Sensitivity is tested with pressure oscillation method
CN110346449A (en) * 2019-05-24 2019-10-18 南通市中京机械有限公司 Sound wave clamper

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105242027A (en) * 2015-10-30 2016-01-13 南通市飞宇石油科技开发有限公司 True triaxial core holder
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
CN109580454A (en) * 2019-01-05 2019-04-05 中国海洋石油集团有限公司 A method of compact reservoir Fluid Sensitivity is tested with pressure oscillation method
CN110346449A (en) * 2019-05-24 2019-10-18 南通市中京机械有限公司 Sound wave clamper

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