CN101852714A - Measuring system and method of low-speed non-linear seepage parameters - Google Patents

Measuring system and method of low-speed non-linear seepage parameters Download PDF

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Publication number
CN101852714A
CN101852714A CN 201010164988 CN201010164988A CN101852714A CN 101852714 A CN101852714 A CN 101852714A CN 201010164988 CN201010164988 CN 201010164988 CN 201010164988 A CN201010164988 A CN 201010164988A CN 101852714 A CN101852714 A CN 101852714A
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China
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holding unit
type pipe
opening
pressure
core holding
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CN 201010164988
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Chinese (zh)
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CN101852714B (en
Inventor
程林松
曾保全
李春兰
郝斐
郑华
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中国石油大学(北京)
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Abstract

The embodiment of the invention provides measuring system and method of low-speed non-linear seepage parameters. The system comprises a power output device, a pressure measuring device and a flow measuring device, wherein the power output device is connected with a first opening of an intermediate container through a pipeline and is used for outputting different drive pressures so as to displace a displacing fluid in the intermediate container to be transmitted to a core of a core holder by the pipeline; the pressure measuring device comprises a pressure gage and a U-shaped pipe pressure gage which are respectively connected with a third opening of the core holder through pipelines and is used for measuring the pressure of the third opening of the core holder under different drive pressures; the U-shaped pipe pressure gage can display the level height difference so as to acquire the starting pressure of the core when the drive pressure is reduced to the minimum value, a switching part is in a closed state and the self level is stable; and the flow measuring device is connected with a fourth opening of the core holder through a pipeline and is used for measuring the volume of the displacing fluid seeped from the core under the different pressures of the third opening. The system can accurately measure the pressure, the starting pressure and the fluid volume under the low-speed non-linear seepage conditions.

Description

The measuring system of low-speed non-linear seepage parameters and method
Technical field
The present invention relates to test the infiltrative technical field of porosint, particularly a kind of measuring system of low-speed non-linear seepage parameters and method.
Background technology
Low-speed non-linear seepage (low velocity non-linear fluid flow) is a kind of phenomenon that fluid shows during seepage flow in LOW PERMEABILITY POROUS MEDIA (Low Permeability Porous Media).This phenomenon extensively is present in related discipline fields such as Oil-Gas Field Development Engineering, Geotechnical Engineering, hydraulic engineering and Industrial Catalysis.Seepage flow in the LOW PERMEABILITY POROUS MEDIA no longer satisfies Darcy's law (Darcy ' s Law).Characteristic curve form and fluid type, rock type and the fluid saturation etc. of low-speed non-linear seepage are closely related; The percolation ability of fluid in porous medium is the continuous function of pressure.Fig. 1 is the hypotonic porous medium typical non linear seepage flow characteristic curve synoptic diagram of drawing according to the method for prior art.As shown in Figure 1, numerous researchers are the straight-line segment ed reverse extendings with " flow velocity-pressure gradient " curve, obtain intending starting pressure gradient (shown in the c point), and this is revised Darcy's law as additional filtrational resistance, but ignored understanding and research, and the method for prior art can't obtain starting pressure gradient (shown in a point) exactly to low-speed non-linear seepage.
The inventor finds that experimental technique and the experimental apparatus of measuring the low-speed non-linear seepage characteristic curve are not at present still obviously improved in realizing process of the present invention, mainly be because experimental pressure is too low, fluid volume is little.Therefore, experimental data is had relatively high expectations to measuring accuracy, and common pressure and flow measurement are difficult to meet the demands.If purchase Specialty Experiment equipment, price general charged costliness, operating process complexity, damage easily in the practice process, also are difficult to manifest the superiority of this type of professional equipment.From publication document CN200610069507.8 both at home and abroad, the measuring method of intending the starting pressure gradient is comparatively perfect, but more the relation of " flow velocity-pressure gradient " in the low-pressure scope (ad curve) can't accurately be measured even can't be measured, but also does not form starting pressure (a point) measuring method of LOW PERMEABILITY POROUS MEDIA.Therefore, low-speed non-linear seepage curve complete in the LOW PERMEABILITY POROUS MEDIA can't be drawn, and has restricted the development of low-speed non-linear seepage theory.
Summary of the invention
In view of this, the objective of the invention is to overcome the deficiencies in the prior art, a kind of measuring method and system of low-speed non-linear seepage characteristic curve are provided, to measure liquid mediums pressure and liquid volume during seepage flow in LOW PERMEABILITY POROUS MEDIA, obtain pressure, flow velocity and the starting pressure of low-speed non-linear seepage, and draw complete low-speed non-linear seepage curve, reach the purpose of low-speed non-linear seepage feature in the research LOW PERMEABILITY POROUS MEDIA.
On the one hand, the embodiment of the invention provides a kind of measuring system of low-speed non-linear seepage parameters, comprising:
Intermediate receptacle has first opening and second opening, and inner hollow is to hold displacing fluid;
Core holding unit, have the 3rd opening and the 4th opening, the 3rd opening of described core holding unit is connected with second opening of described intermediate receptacle by pipeline, be provided with rock core in the described core holding unit, the pipeline of second opening of the described intermediate receptacle of connection and the 3rd opening of described core holding unit is provided with switch portion, and described switch portion is near described second opening;
PTO is connected with first opening of described intermediate receptacle by pipeline, be used for exporting different driving pressures with the displacing fluid of the described intermediate receptacle of displacement via the rock core of pipeline transmission to the core holding unit;
Device for pressure measurement comprises tensimeter and U type pipe pressure meter, and described manometric range is greater than the range of described U type pipe pressure meter;
Described tensimeter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of described manometric range and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures;
Described U type pipe pressure meter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of the range of described U type pipe pressure meter and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures; And be in liquid level in closed condition and the described U type pipe pressure meter and reach when stablizing when described driving pressure is reduced to minimum value, described switch portion, show that the liquid level difference is to obtain the starting pressure of described rock core;
Flow measurement device is connected with the 4th opening of described core holding unit by pipeline, is used to measure under different described the 3rd cracking pressures the volume of the displacing fluid that goes out from described rock core seepage flow.
On the other hand, the embodiment of the invention provides the measuring system of another kind of low-speed non-linear seepage parameters, comprising:
Intermediate receptacle has first opening and second opening, and inner hollow is to hold displacing fluid;
Core holding unit, have the 3rd opening and the 4th opening, the 3rd opening of described core holding unit is connected with second opening of described intermediate receptacle by pipeline, be provided with rock core in the described core holding unit, the pipeline of second opening of the described intermediate receptacle of connection and the 3rd opening of described core holding unit is provided with switch portion, and described switch portion is near described second opening;
PTO is connected with first opening of described intermediate receptacle by pipeline, be used for exporting different driving pressures with the displacing fluid of the described intermediate receptacle of displacement via the rock core of pipeline transmission to the core holding unit;
Device for pressure measurement, comprise tensimeter, a U type pipe pressure meter and the 2nd U type pipe pressure meter, described manometric range is greater than the range of a described U type pipe pressure meter, and the range of a described U type pipe pressure meter is greater than the range of described the 2nd U type pipe pressure meter;
Described tensimeter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of described manometric range and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures;
A described U type pipe pressure meter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of the range of a described U type pipe pressure meter and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures;
Described the 2nd U type pipe pressure meter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of the range of described the 2nd U type pipe pressure meter and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures; And be in liquid level in closed condition and described the 2nd U type pipe pressure meter and reach when stablizing when described driving pressure is reduced to minimum value, described switch portion, show that the liquid level difference is to obtain the starting pressure of described rock core;
Flow measurement device is connected with the 4th opening of described core holding unit by pipeline, is used to measure under different described the 3rd cracking pressures the volume of the displacing fluid that goes out from described rock core seepage flow.
Also on the one hand, the embodiment of the invention provides a kind of measuring method of low-speed non-linear seepage parameters, comprising:
By the different pressure of PTO output with the displacing fluid in the displacement intermediate receptacle via the rock core of pipeline transmission to the core holding unit;
By the device for pressure measurement that is connected with the 3rd opening of described core holding unit with pipeline, the 3rd cracking pressure of measurement described core holding unit under different driving pressures, described device for pressure measurement comprises tensimeter and U type pipe pressure meter, and described manometric range is greater than the range of described U type pipe pressure meter;
According to the 3rd cracking pressure of described core holding unit and the matching result of described tensimeter and described U type pipe pressure meter range separately, start one of them of described tensimeter and U type pipe pressure meter;
By the flow measurement device that is connected with the 4th opening of described core holding unit with pipeline, the volume of the displacing fluid that under different described the 3rd cracking pressures, goes out from described rock core seepage flow according to the Preset Time linear measure longimetry;
When described driving pressure is reduced to minimum value, close switch portion near second opening of described intermediate receptacle, it is poor to obtain the liquid level that the liquid level in the described U type pipe pressure meter reaches when stablizing, and obtains the starting pressure of described rock core according to described liquid level difference.
Last aspect, the embodiment of the invention provide the measuring method of another low-speed non-linear seepage parameters, comprising:
By the different pressure of PTO output with the displacing fluid in the displacement intermediate receptacle via the rock core of pipeline transmission to the core holding unit;
By the device for pressure measurement that is connected with the 3rd opening of described core holding unit with pipeline, the 3rd cracking pressure of measurement described core holding unit under different driving pressures, described device for pressure measurement comprises tensimeter, a U type pipe pressure meter and the 2nd U type pipe pressure meter, described manometric range is greater than the range of a described U type pipe pressure meter, and the range of a described U type pipe pressure meter is greater than the range of described the 2nd U type pipe pressure meter;
According to the 3rd cracking pressure of described core holding unit and the matching result of described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure meter range separately, start one of them of described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure meter three, close among the above-mentioned three other both;
By the flow measurement device that is connected with the 4th opening of described core holding unit with pipeline, the volume of the displacing fluid that under different described the 3rd cracking pressures, goes out from described rock core seepage flow according to the Preset Time linear measure longimetry;
When the driving pressure of described PTO output is reduced to minimum value, close switch portion near second opening of described intermediate receptacle, and it is poor to obtain the liquid level that the liquid level in described the 2nd U type pipe pressure meter reaches when stablizing, to obtain the starting pressure of described rock core according to described liquid level difference.
The technique scheme that the embodiment of the invention provides, the tensimeter by different ranges and the combination of U type pipe pressure meter realize the real-time monitoring to the inlet end pressure of core holding unit, avoided in long-time measuring process because the zero point drift of adopting high-precision pressure sensor Yin Wendu to raise and cause, make pressure measurements more accurate, improved experimental precision, the unreliable problem of measurement result of also having avoided independent employing tensimeter to bring.With respect to high-precision pressure sensor, adopt U type pipe pressure meter to reduce the measurement cost simultaneously, simplified measurement structure, and not fragile, even overflowing, generation maloperation or range can not make the damage of U type pipe pressure meter yet, improved the security that detects.By when PTO is exported minimum pressure, close the endpiece switch block of intermediate receptacle, and reach when stablizing when liquid level in the U type pipe pressure meter, the liquid level that obtains after stablizing is poor, and obtain the starting pressure of rock core, thereby adopt succinct operating process easily to realize accurate measurement to the starting pressure of LOW PERMEABILITY POROUS MEDIA according to the liquid level difference.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the hypotonic porous medium typical non linear seepage flow characteristic curve synoptic diagram of prior art;
Fig. 2 is the structured flowchart of measuring system of the low-speed non-linear seepage curve of the embodiment of the invention 1;
Fig. 3 is the structured flowchart of measuring system of the low-speed non-linear seepage parameters of the embodiment of the invention 2;
Fig. 4 is the structured flowchart of measuring system of the low-speed non-linear seepage parameters of the embodiment of the invention 3;
Fig. 4 A is the sectional view of seal element among Fig. 4 of the embodiment of the invention 3;
Fig. 5 is the overall flow figure of measuring method of the low-speed non-linear seepage parameters of the embodiment of the invention 4;
Fig. 6 is the particular flow sheet of measuring method of the low-speed non-linear seepage parameters of the embodiment of the invention 5.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtained under the creative work prerequisite.
In embodiments of the present invention, described LOW PERMEABILITY POROUS MEDIA is including but not limited to rock, soil, fluidized bed rock core etc.The displacement of adopting in the embodiment of the invention (displacement) liquid medium including but not limited to: aqueous solution such as distilled water, deionized water, local water, injection water and active water also comprise kerosene, white oil, former wet goods.
Embodiment 1:
The embodiment of the invention 1 provides a kind of measuring system of low-speed non-linear seepage parameters, to be implemented in the pressure under the low-speed non-linear seepage condition and the measurement of fluid volume.The measuring system of the embodiment of the invention is mainly used in to be measured pressure under the low-speed non-linear condition (comprising starting pressure) and fluid volume, and draws " flow velocity-pressure gradient " curve of hypotonic porous medium according to measurement result.
Fig. 2 is the structured flowchart of measuring system of a kind of low-speed non-linear seepage parameters of the embodiment of the invention 1.Below the structure and the function of this measuring system is elaborated, as shown in Figure 2, this measuring system comprises:
Intermediate receptacle 13 has the first opening 13a and the second opening 13b, and inner hollow is to hold displacing fluid 16; Alternatively, can also piston 18 be set in intermediate receptacle 13 and be divided into two with the inner space with intermediate receptacle 13, piston 18 upper spaces hold displacing fluid 16, and piston 18 lower space are held power fluid 17.
Core holding unit 20, have the 3rd opening 21 and the 4th opening 22, the 3rd opening 21 of described core holding unit 20 is connected with the second opening 13b of described intermediate receptacle 13 by pipeline (pipeline) 19, be provided with rock core 23 in the described core holding unit 20, the pipeline 19 that connects the 3rd opening 21 of the second opening 13b of described intermediate receptacle 13 and described core holding unit 20 is provided with switch portion 14, and described switch portion 14 is near the described second opening 13b; Particularly, above-mentioned switch portion 14 for example can be a valve, and wherein valve can be T-valve or six-way valve.The wherein above-mentioned rock core that is used for testing is a kind of of LOW PERMEABILITY POROUS MEDIA, further, the rubber sleeve 24 that closely contacts with rock core 23 can also be set on the outside surface of rock core 23.Further, core holding unit 20 can also be connected with confined pressure pump 31 by pipeline 32, and the output terminal pipeline of confined pressure pump 31 is provided with valve 33 and tensimeter 34.
PTO 11 is connected with the first opening 13a of described intermediate receptacle 13 by pipeline 12, is used for exporting different driving pressures and transfers to rock core 23 in the core holding unit 20 with the displacing fluid 16 of the described intermediate receptacle 13 of displacement via pipeline 19; Particularly, PTO 11 for example can be power pump, and wherein power pump can be constant speed and constant pressure pump, ISCO pump, Quizix pump or the nitrogen cylinder that disposes reduction valve etc.Further, can also on pipeline 12, switch portion 15 be set the position of the first opening 13a of close intermediate receptacle 13.
Device for pressure measurement comprises tensimeter 26 and U type pipe pressure meter 28, and the range of described tensimeter 26 is greater than the range of described U type pipe pressure meter 28;
Described tensimeter 26, be connected with the 3rd opening 21 of described core holding unit 20 by pipeline, be used for when the 3rd cracking pressure of the range of described tensimeter 26 and described core holding unit 20 is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit 20 under different driving pressures;
Described U type pipe pressure meter 28, be connected with the 3rd opening 21 of described core holding unit 20 by pipeline, be used for when the 3rd cracking pressure of the range of described U type pipe pressure meter 28 and described core holding unit 20 is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit 20 under different driving pressures; And be in liquid level in closed condition and the described U type pipe pressure meter 28 and reach when stablizing when described driving pressure is reduced to minimum value, described switch portion 14, show that the liquid level difference is to obtain the starting pressure of described rock core;
Flow measurement device 25 is connected with the 4th opening 22 of described core holding unit 20 by pipeline, is used to measure under different described the 3rd cracking pressures the volume of the displacing fluid 16 that goes out from described rock core 23 seepage flow.
Below structure, function and the effect of above-mentioned measuring system each several part further described respectively.
By in intermediate receptacle 13, being provided with the piston 18 that is used to separate power fluid 17 and displacing fluid 16, can cushion the pressure of PTO 11 outputs effectively, avoid core holding unit 20 inlet pressures (i.e. the 3rd cracking pressure) near a certain value, to fluctuate, make inlet pressure keep stable or steady.
Further, the display device that shows current output pressure can be set on the power pump, be beneficial to control the amplitude of step-down, and be beneficial to the inlet pressure of estimating core holding unit 20.
Preferably, in the experimentation of the embodiment of the invention, confined pressure pump 31 rubber sleeve in core holding unit 20 24 all the time provides pressure, and rubber sleeve 24 is closely contacted with the cylinder of rock core 23, helps preventing that displacing medium from flowing through from the surface of contact of rock core 23 with rubber sleeve 24.
Particularly, the hydraulic fluid in the U type pipe pressure meter 28 can comprise water, mercury or kerosene.Tensimeter 26 can be common tensimeter, and at this moment, this device for pressure measurement forms 2 stage pressure monitors, and the 1st grade is ordinarily manometer, and the 2nd grade is U type pipe pressure meter.When the inlet end pressure of core holding unit 20 is in this manometric range ability, starts this tensimeter by means such as manual control, external control or external trigger and enter duty, and close U type pipe pressure meter 28; When the inlet end pressure of core holding unit 20 is in the range ability of U type pipe pressure meter 28, starts this U type pipe pressure meter 28, and close this tensimeter 26 according to means such as manual control, external control or external trigger simultaneously.Further, the embodiment of the invention also starts corresponding pressure monitor based on following principle: when core holding unit 20 inlet pressures satisfy the measurement range of adjacent two-stage pressure-measuring device simultaneously, and the preferential startup pressure-measuring device that range ability is less and precision is higher of selecting.
Alternatively, can further with the supporting scale mark 30 that is provided with of U type pipe pressure meter, this scale mark 30 can be that U type pipe pressure meter itself is intrinsic, also can be an independently graduated scale.Alternatively, on two mouths of pipe of U type pipe pressure meter 28 film with hole can also be set further, be polluted, and reduce the influence of evaporation experimental result with hydraulic fluid in preventing from effectively to manage.The material of film and the shape in hole, size and arrangement mode, the embodiment of the invention does not limit.
Further, can the fixed support that be complementary with its shape, structure be set,, be convenient to reduce reading error so that liquid level keeps level in the U type pipe pressure meter to U type pipe pressure meter 28.
Because the U type pipe mouth of pipe opens wide, atmospheric pressure is offset at the pressure of core holding unit inlet generation and the atmospheric pressure of outlet, and the pressure that U type intraluminal fluid face difference in height produces is the pressure that acts on the rock core, also is the inlet end pressure of core holding unit.
The embodiment of the invention adopts U type pipe pressure meter, and the main cause that does not adopt high-precision pressure sensor to carry out the real-time pressure monitoring is: the variation of any component parameter of pressure transducer (comprising the fluctuation of supply voltage), the capital causes the drift of output voltage, and the variation of environment temperature is the main reason that causes this drift, it also is the most formidable factor, this is because the electric conductivity of semiconductor element is very responsive to temperature, and environment temperature is difficult to keep constant in long measuring process, thereby the quiescent point that will cause triode in the pressure transducer takes place small and changes slowly, this variable quantity can be amplified step by step by the circuit of back, finally produce bigger voltage drift at output terminal, therefore, zero point drift also makes temperature float.
The embodiment of the invention requires real-time monitoring pressure, and uses differential pressure pickup for a long time, and its temperature is improved, and zero point drift takes place, thereby reduces measuring accuracy.In view of this, the embodiment of the invention adopts U type pipe pressure meter to realize the real-time pressure monitoring.There is not the zero point drift phenomenon in U type pipe pressure meter when measuring for a long time, so can guarantee experimental precision, and U type pipe pressure meter is with low cost, reduced the detection cost, and it is not fragile, can not damage U type pipe pressure meter even the generation range overflows yet, alleviate maintenance costs and burden, help carrying out in a large number this type of experiment.
Particularly, flow measurement device 25 shown in Figure 2 is connected with the endpiece pipeline of described core holding unit 20, is used for the volume of the fluid that goes out from described rock core 23 seepage flow under different described inlet end pressure according to the Preset Time linear measure longimetry.
Alternatively, when this flow measurement device 25 can also be used at same inlet end pressure, according to default multistage time span, measure in every section time span the volume of the fluid that goes out from described rock core 23 seepage flow respectively, by the fluid flow under the same pressure is write down three times at least, then the flow velocity of each time calculating is got arithmetic mean, can improve the accuracy of metering.
Further, flow measurement device 25 can adopt capillary flowmeter (capillary flowmeter).In the experimentation of the embodiment of the invention, because the fluid flow that seepage flow goes out from hypotonic porous medium is less, if adopt graduated cylinder metering liquid volume, will cause big measuring error, measuring accuracy can't guarantee, and the graduated cylinder opening is bigger, be exposed in the air, have between liquid-to-air in the graduated cylinder than large contact surface and amass, fluid is easily evaporated, influence the measuring accuracy of fluid volume, therefore be not suitable for adopting graduated cylinder to measure.Compare with little graduated cylinder, the advantage of the capillary flowmeter of the embodiment of the invention also comprises: at first, be convenient to read fluid volume, small liquid volume can produce significantly liquid column length in capillary flowmeter; Secondly, internal diameter is not less, and liquid in pipe and air contact area are little, and is volatile or volatile quantity is less, can guarantee the accuracy of measuring in long measuring process, can reduce fluid evaporator under the micrometeor condition effectively to the influence of experimental result.In a word, this is the instrument of fluid seepage flow volume in a kind of economical and practical accurate measurement LOW PERMEABILITY POROUS MEDIA.
In embodiments of the present invention, can make the hollow billet flowmeter of different size (range, precision) according to actual needs, the hollow billet flowmeter that for example can be produced as follows specification is to satisfy the demand of the fluid volume measurement under the different pressures: range 0.1ml, precision 0.0005ml, range 0.5ml, precision 0.0025ml, range 1.0ml, precision 0.005ml; Range 5.0ml, precision 0.0125ml etc.When core permeability to be tested is big, can select the hollow billet flowmeter of relatively large journey, when core permeability to be tested hour, can select the hollow billet flowmeter of less range, the rest may be inferred for other situation, to adapt to different needs.
The parameter of utilizing above-mentioned measuring system to obtain is handled at the enterprising line data of signal conditioning package, promptly can draw " flow velocity-pressure gradient " relation curve.Particularly, in " flow velocity-pressure gradient " relation curve, pressure gradient equals the ratio of core holding unit 20 inlet pressures and rock core length, i.e. gradP=P/L, and gradP is a pressure gradient (unit: MPa/m); P is a core holding unit inlet pressure (unit: MPa); L is a rock core length (unit: m).The measurement numerical value of core holding unit 20 inlet pressures obtains by dual mode: the pressure that usual pressure meter reading and U type pipe liquid level difference produce.Wherein, for ordinarily manometer, the direct corresponding numerical value of reading pointer; And for U type Guan Eryan, the pressure of U type pipe liquid level difference correspondence is: ρ gh, ρ are the density (unit: kg/m of hydraulic fluid in the U type pipe 3), g is the on-site acceleration of gravity of experiment (unit: m/s 2), h is the poor (unit: m) of U type pipe liquid level.The computing formula of flow rate of liquid is: v=Q/ (π r 2T), Q is the fluid volume (unit: m in the t time 3); T is each time span (unit: s) of measuring liquid volume; R is the radius (unit: m) of core section.The drafting of ae section curve can connect diffusing point such as " flow velocity~pressure gradient " many groups by popular software.
The intersection point that utilizes extrapolation method can obtain the extended line of de section and pressure gradient coordinate axis is intends starting pressure gradient (c point).
" flow velocity-pressure gradient " relation curve and starting pressure by embodiment of the invention acquisition, help setting up the low-speed non-linear seepage mathematical model of LOW PERMEABILITY POROUS MEDIA, and can be used for studying the scope of effectively employing, pressure distribution feature and the evaluating production capacity of the fluid in the hypotonic porous medium, be particularly suitable for fields such as oil-gas field development and hydraulic engineering.
Embodiment 2:
Fig. 3 is the structured flowchart of the measuring system of the embodiment of the invention 2 another kind of low-speed non-linear seepage parameters.The measuring system of Fig. 3 is compared with the measuring system of Fig. 2, and difference is that device for pressure measurement is 3 stage pressure monitoring devices based on tensimeter 26, a U type pipe pressure meter 28 and the 2nd U type pipe pressure meter 35 among Fig. 3.Below be elaborated at above-mentioned difference, something in common then repeats no more.
See also Fig. 3, device for pressure measurement comprises: tensimeter 26, a U type pipe pressure meter 28 and the 2nd U type pipe pressure meter 35, the range of described tensimeter 26 is greater than the range of a described U type pipe pressure meter 28, and the range of a described U type pipe pressure meter 28 is greater than the range of described the 2nd U type pipe pressure meter 35;
Described tensimeter 26, be connected with the 3rd opening 21 of described core holding unit 20 by pipeline, be used for when the 3rd cracking pressure of the range of described tensimeter 26 and described core holding unit 20 is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit 20 under different driving pressures;
A described U type pipe pressure meter 28, be connected with the 3rd opening 21 of described core holding unit 20 by pipeline, be used for when the 3rd cracking pressure of the range of a described U type pipe pressure meter 28 and described core holding unit 20 is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit 20 under different driving pressures;
Described the 2nd U type pipe pressure meter 35, be connected with the 3rd opening 21 of described core holding unit 20 by pipeline, be used for when the 3rd cracking pressure of the range of described the 2nd U type pipe pressure meter 35 and described core holding unit 20 is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit 20 under different driving pressures; And be in liquid level in closed condition and described the 2nd U type pipe pressure meter 35 and reach when stablizing when described driving pressure is reduced to minimum value, described switch portion 14, show that the liquid level difference is to obtain the starting pressure of described rock core.
Particularly, the measuring system of the embodiment of the invention in the course of the work, according to the 3rd cracking pressure (being inlet end pressure) of described core holding unit 20 and the matching result of described tensimeter, a described U type pipe pressure meter 28 and described the 2nd U type pipe pressure meter 35 range separately, start one of them of described tensimeter 26, a described U type pipe pressure meter 28 and described the 2nd U type pipe pressure meter 35 threes, close among the above-mentioned three other both.
Particularly, when core holding unit 20 inlet pressures in the measurement range of water column U type pipe pressure meter, and during the pressure that power pump is not enough to provide lower, and the endpiece of intermediate receptacle 13 near switch portion 14 be closed after, the inlet pressure of core holding unit 20 constantly descends, water colunm height in the water column U type pipe pressure meter also changes thereupon, (do not reach when stablizing) when significant change occurring when continuous several days of water colunm height in the water column U type pipe pressure meter even in the longer time, the pressure that this water column produces is Starting pressure of low permeability cores.
Alternatively, as shown in Figure 3, described tensimeter 26, a described U type pipe pressure meter 28 and described the 2nd U type pipe pressure meter 35 can also pass through first switch portion 27 respectively, second switch portion 29 is connected with the inlet end pipeline of described core holding unit 20 with the 3rd switch portion 36, and form intersection point A respectively, B, C, intersection point A wherein, B, C can link together by six-way valve, by above-mentioned configuration, operating personnel can be according to the inlet end pressure and the described tensimeter 26 of described core holding unit 20, the matching result of a described U type pipe pressure meter 28 and described the 2nd U type pipe pressure meter 35 range separately, open first switch portion 26, in second switch portion 29 and the 3rd switch portion 36 one of them, and close first switch portion 26, in second switch portion 29 and the 3rd switch portion 36 two other is to start the device for pressure measurement that is associated with the switch portion of described unlatching.
Particularly, in 3 stage pressure monitoring devices shown in Figure 3, the 1st grade is adopted ordinarily manometer, and the 2nd grade is adopted mercury slug U type pipe pressure meter, and 3rd level adopts water column U type pipe pressure meter or kerosene post U type pipe pressure meter.Alternatively, the hydraulic fluid in the U type pipe of 3rd level can also adopt other close liquid of density and water or kerosene, perhaps adopts the lighter liquid of density for mercury.Above-mentioned 3 grades of surveying instrument ranges successively decrease successively, and all the film with hole can be set further on two mouths of pipe of the U type pipe pressure meter of the 2nd grade and 3rd level.
Below further specify the configuration of above-mentioned 3 stage pressure monitoring devices.
At the 1st grade ordinarily manometer is set, when the inventor found to adopt the tensimeter Monitoring Data separately, when pressure to be monitored was in about 1/3~2/3 scope of tensimeter range, the pressure data that is obtained was reliable; But when monitoring pressure was greater than or less than this scope, the data error of being obtained was bigger.Therefore make tensimeter be operated in its reliable range section as far as possible, in embodiments of the present invention, hold the device inlet pressure when big when rock core, this tensimeter is in running order, carries out pressure survey exactly.
At the 2nd grade mercury slug U type pipe pressure meter is set, according to the relational expression of Δ P=ρ gh as can be known, because the density of mercury is bigger, can make the liquid degree difference in height (under the prerequisite that does not influence reading accuracy) in its pressure measurement range be unlikely to too big, and liquid degree difference in height is big more, just correspondingly require the length equidimension of U type pipe to increase, can reduce adopting the demand of long U type pipe so mercury slug U type pipe pressure meter is set at the 2nd grade.
At 3rd level water column U type pipe pressure meter being set is because the density of water is less, when measuring slight pressure, can show that in pipe tangible liquid level is poor, thereby can make measurement result more accurate, can avoid the liquid level difference too for a short time make measure not accurate enough, and the problem that measurement is made troubles.Adopt kerosene post U type pipe pressure meter that similar effect is also arranged.
In a word, by adopting mercury slug U type pipe pressure meter, and adopt water column U type pipe pressure meter, liquid level in the corresponding pressure scope is differed greatly or more obvious, be convenient to read pressure value at 3rd level at the 2nd grade.
Certainly, it is 3 grades that the rank of the pressure monitoring device of the embodiment of the invention is not restricted to, and those skilled in the art can expand progression according to the instruction of the embodiment of the invention.
In embodiments of the present invention, because the maximum pressure that experiment is adopted requires less than 1.6MPa, minimum pressure requires to be about 0.01MPa, at this requirement of experiment, the specification of above-mentioned 3 stage pressure monitoring instruments optionally is designed to: ordinarily manometer: range 0~1.6MPa, precision: 0.01MPa; Mercury slug U type pipe: range 0~0.2MPa, scale resolution 0.005m; Water column U type pipe: range 0~0.02MPa, scale resolution 0.005m.In other embodiments, requiring the minimum driving pressure of PTO output is 0.005MPa.
Embodiment 3:
Fig. 4 is the structured flowchart of measuring system of another low-speed non-linear seepage parameters of the embodiment of the invention 3.Measuring system shown in Figure 4 is compared with measuring system shown in Figure 3, is outside the difference, and flow measurement device is based on the multistage flow monitoring device of a plurality of capillary flowmeters among Fig. 4.Below be elaborated at above-mentioned difference, something in common then repeats no more.
Multistage flow monitoring device among Fig. 4 comprises: the capillary flowmeter of at least two different sizes is respectively arranged with switch portion on the pipeline of the 4th opening 22 that connects each capillary flowmeter and described core holding unit 20.
Thereby can be according to the inlet end pressure of described core holding unit 20, one of them that makes described at least two switch portion is opened to start the capillary flowmeter of corresponding specification.For example schematically illustrated the capillary flowmeter 38,39,40 of three different sizes among Fig. 4, and illustrated the switch portion that on the pipeline of the 4th opening 22 that connects each capillary flowmeter and described core holding unit 20, is provided with respectively, shown in label among Fig. 4 41.
Further, as shown in Figure 4, the porch of described capillary flowmeter can also be provided with seal element 42.Described seal element 42 is used to make capillary flowmeter and pipeline to keep well contacting, and alternatively, above-mentioned seal element 42 can adopt the capillary flowmeter box cupling.
Fig. 4 A is the sectional view of seal element among Fig. 4 of the embodiment of the invention 3.Shown in Fig. 4 A, seal element comprises: pressure-pad 1, metal two are logical 2, plastics or rubber clip 3 and rubber sheet gasket 4.The assemble flow that is connected between the capillary flowmeter and seal element in the embodiment of the invention is described below in conjunction with Fig. 4 A.At first, make capillary flowmeter (not illustrating among the figure) pass pressure-pad 1 and rubber clip 3 successively, then, the pressure-pad 1 that turns clockwise, and extruding rubber clip 3 make rubber clip 3 closely contact with capillary flowmeter, capillary flowmeter is closely contacted with rubber sheet gasket 4, avoid capillary flowmeter directly to contact with metal two logical 2, prevent hydraulic slip, wherein pipeline 5 is welded on the metal two logical 2.
The capillary flowmeter of a plurality of different sizes that the multistage flow monitoring device among Fig. 4 comprises can be selected from following specification: range 0.1ml, precision 0.0005ml; Range 0.5ml, precision 0.0025ml; Range 1.0ml, precision 0.005ml; Perhaps, range 5.0ml, precision 0.0125ml.In addition, the length of capillary flowmeter can be designed to 23cm, and its caliber can be designed to 1mm, 2mm, 2.5mm or 6mm.
In the embodiment of the invention, capillary flowmeter can adopt the glass capillary that has scale, by reading the volume markings of the liquid column length correspondence of gathering in the pipe, can obtain the fluid volume that goes out from rock core seepage flow.In measuring process, can adopt multistage capillary flowmeter multiple measurement, as required, optionally use 2 grades or 3 grades of capillary flowmeters measurement fluid volumes.
In measuring process, when using certain one-level capillary flowmeter to measure, close valve with other two-stage capillary flowmeter; In experimentation,, when pressure is higher, adopt the capillary flowmeter of wide range for same block of rock core; When pressure is low, adopt the capillary flowmeter of little range.
Alternatively, also can adopt other according to the duty of controlling the capillary flowmeter that switches different size, the comparative result of the range of the fluid volume that can in predefined time span, collect according to capillary flowmeter and a plurality of capillary flowmeters with different size for example, select to open the capillary flowmeter that is complementary with described fluid volume, and close and the unmatched capillary flowmeter of described fluid volume.Further, when the above-mentioned fluid volume collected is complementary with the range of two capillary flowmeters simultaneously at least, preferentially select to adopt the less capillary flowmeter of range to measure.
Can further improve measuring accuracy by the above-mentioned configuration and the corresponding course of work, reduce error the fluid volume of low-speed non-linear seepage under the micrometeor condition.
In sum, 3 grades of the embodiment of the invention or multistage pressure measurement mechanism are not only simple in structure, also have simple and convenient, accurately measure liquid at the pressure (comprising starting pressure) of core holding unit inlet, detect advantage with low cost.And employing makes flow rate test more flexibly, efficiently, accurately based on the multistage flow measurement device of the capillary flowmeter of a plurality of different sizes.
Embodiment 4:
Below describe the principle of work of embodiment of the invention Fig. 2-measuring system shown in Figure 4 in detail.
Fig. 5 is the process flow diagram of measuring method of a kind of low-speed non-linear seepage parameters of the embodiment of the invention 4.As shown in Figure 5, this method comprises the steps:
S501, by the different driving pressure of PTO output with the displacing fluid in the displacement intermediate receptacle via the rock core of pipeline transmission to the core holding unit;
S502, device for pressure measurement by being connected with the 3rd opening of core holding unit with pipeline, the 3rd cracking pressure of measurement described core holding unit under different driving pressures;
Wherein, described device for pressure measurement comprises tensimeter and U type pipe pressure meter, and described manometric range is greater than the range of described U type pipe pressure meter;
S503, according to the 3rd cracking pressure of described core holding unit and the matching result of described tensimeter and described U type pipe pressure meter range separately, start one of them of described tensimeter and U type pipe pressure meter;
S504, flow measurement device by being connected with the 4th opening of described core holding unit with pipeline, the volume of the displacing fluid that under different described the 3rd cracking pressures, goes out from described rock core seepage flow according to the Preset Time linear measure longimetry;
S505, when described driving pressure is reduced to minimum value, close switch portion near second opening of described intermediate receptacle, it is poor to obtain the liquid level that the liquid level in the described U type pipe pressure meter reaches when stablizing, and obtains the starting pressure of described rock core according to described liquid level difference.
Alternatively, two U type pipe pressure score can also be connected to the 3rd opening of core holding unit by pipeline, count in a U type pipe pressure and the 2nd U type pipe pressure in the embodiment of the invention and distinguish, wherein, the range of described the 2nd U type pipe pressure meter is less than the range of described U type pipe pressure meter, corresponding to this situation, the detailed process of corresponding steps S502, S503 and S505 is as follows among Fig. 5:
The detailed process of S502 comprises: by the device for pressure measurement that is connected with the 3rd opening of core holding unit with pipeline, measure the 3rd cracking pressure of described core holding unit under different driving pressures;
The detailed process of S503 comprises: according to the 3rd cracking pressure of described core holding unit and the matching result of described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure meter range separately, start one of them of described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure meter three, close among the above-mentioned three other both;
The detailed process of S505 comprises: when the driving pressure of described PTO output is reduced to minimum value, close switch portion near second opening of described intermediate receptacle, and obtain liquid level in described the 2nd U type pipe pressure meter and reach face difference in height when stablizing, to obtain the starting pressure of described rock core according to described liquid level difference.
Particularly, a described U type pipe pressure meter comprises mercury slug U type pipe pressure meter, and described the 2nd U type pipe pressure meter comprises water column U type pipe pressure meter or kerosene post U type pipe pressure meter.
Further, described flow measurement device comprises at least one capillary flowmeter, and when described flow measurement device comprises more than one capillary flowmeter, on the pipeline of the 4th opening that connects each capillary flowmeter and described core holding unit, be respectively arranged with switch portion.Alternatively, the porch of described capillary flowmeter can also be provided with seal element.
Correspondingly, the detailed process of S504 can comprise among Fig. 5: at same inlet end pressure, according to default multistage time span, measure in every section time span the volume of the displacing fluid that goes out from described rock core seepage flow respectively by described capillary flowmeter.
Further, the capillary flowmeter that comprises at least two different sizes when described flow measurement device, and when being connected with the endpiece pipeline of described core holding unit by at least two switch portion respectively, method shown in Figure 5 can also comprise the steps: the 3rd cracking pressure (inlet end pressure) according to described core holding unit, by open described at least two switch portion one of them to start the capillary flowmeter of corresponding specification.
Further, the porch of described capillary flowmeter can also be provided with seal element.
Particularly, the minimum value of the driving pressure of described PTO output is 0.01MPa.In other embodiments, also can the output power minimum value of driving pressure of device output is set at 0.005MPa.
Embodiment 5:
Below be example with the low-permeability oil deposit rock core, and Fig. 5 institute method method is described in detail in conjunction with embodiment of the invention measuring system shown in Figure 3.Fig. 6 is the particular flow sheet of measuring method of a kind of low-speed non-linear seepage parameters of the embodiment of the invention 5.As shown in Figure 6, this method comprises the steps:
S601, utilize power pump that the driving energy is provided, the displacing fluid of displacement intermediate receptacle makes the displacing fluid rock core of flowing through.
S602, when the core entry pressure stability, record core entry pressure, and the fluid volume of record rock core outlet.
Particularly, the fluid flow under the same pressure writes down three times at least, then with the flow velocity arithmetic mean of each time calculating, to improve the accuracy of metering.
The pressure that S603, reduction power pump provide repeats aforesaid operations, till the pressure that is not enough to provide littler until power pump.
In this process, when the core holding unit inlet pressure is in certain first class pressure surveying instrument scope, close the valve of other two-stage pressure-measuring instrument.Each pressure-measuring device all is connected with the core holding unit source line by independent valve.According to the variation order of core holding unit inlet pressure, select each pressure-measuring device successively for use.Have only when the core holding unit inlet pressure is in the range ability of certain first class pressure measuring instrument, the valve open that will be connected just with this pressure-measuring device, and close the valve of other 2 pressure-measuring devices.And when the core holding unit inlet pressure satisfies the measurement range of adjacent two-stage pressure-measuring device simultaneously, preferentially select the pressure-measuring device that range ability is less and precision is higher.
S604, when its minimum value that can provide is provided the pressure that provides when power pump, close the outlet valve of intermediate receptacle, and the slow situation about descending of liquid level of observing liquid level water column U type pipe, significant change does not take place when continuous several days of liquid level or in the longer time, be when liquid level reaches stable (core permeability is low more, and stabilization time is long more), poor by reading liquid level final in the water column U type pipe, and record water column liquid level is poor, so that calculate the starting pressure of rock core.Wherein, observe liquid level whether reach stable time range may for several days to several weeks.
S605, finish laggard line data in experiment and handle and drawing course, each group pressure and data on flows are processed into pressure gradient and flow velocity respectively, and water column liquid level difference and pressure conversion formula when stablizing according to water column U type intraluminal fluid face, calculate the starting pressure of rock core, then starting pressure is converted to the starting pressure gradient, draw " flow velocity-pressure gradient " relation curve at last.
By adopting the measuring method of the embodiment of the invention, can guarantee accurately to measure the pressure of low-speed non-linear seepage, and the starting pressure of measurement LOW PERMEABILITY POROUS MEDIA, and can accurately measure fluid volume under the micrometeor condition, help drawing low-speed non-linear seepage characteristic curve complete in the LOW PERMEABILITY POROUS MEDIA, promoted the development of low-speed non-linear seepage theory.
Above embodiment only in order to the technical scheme of the explanation embodiment of the invention, is not intended to limit; Although the embodiment of the invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the embodiment of the invention.

Claims (10)

1. the measuring system of a low-speed non-linear seepage parameters is characterized in that, described measuring system comprises:
Intermediate receptacle has first opening and second opening, and inner hollow is to hold displacing fluid;
Core holding unit, have the 3rd opening and the 4th opening, the 3rd opening of described core holding unit is connected with second opening of described intermediate receptacle by pipeline, be provided with rock core in the described core holding unit, the pipeline of second opening of the described intermediate receptacle of connection and the 3rd opening of described core holding unit is provided with switch portion, and described switch portion is near described second opening;
PTO is connected with first opening of described intermediate receptacle by pipeline, be used for exporting different driving pressures with the displacing fluid of the described intermediate receptacle of displacement via the rock core of pipeline transmission to the core holding unit;
Device for pressure measurement comprises tensimeter and U type pipe pressure meter, and described manometric range is greater than the range of described U type pipe pressure meter;
Described tensimeter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of described manometric range and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures;
Described U type pipe pressure meter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of the range of described U type pipe pressure meter and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures; And be in liquid level in closed condition and the described U type pipe pressure meter and reach when stablizing when described driving pressure is reduced to minimum value, described switch portion, show that the liquid level difference is to obtain the starting pressure of described rock core;
Flow measurement device is connected with the 4th opening of described core holding unit by pipeline, is used to measure under different described the 3rd cracking pressures the volume of the displacing fluid that goes out from described rock core seepage flow.
2. measuring system according to claim 1 is characterized in that described flow measurement device comprises at least one capillary flowmeter; When described flow measurement device comprises more than one capillary flowmeter, on the pipeline of the 4th opening that connects each capillary flowmeter and described core holding unit, be respectively arranged with switch portion.
3. measuring system according to claim 3 is characterized in that the porch of described capillary flowmeter also is provided with seal element.
4. the measuring system of a low-speed non-linear seepage parameters is characterized in that, described measuring system comprises:
Intermediate receptacle has first opening and second opening, and inner hollow is to hold displacing fluid;
Core holding unit, have the 3rd opening and the 4th opening, the 3rd opening of described core holding unit is connected with second opening of described intermediate receptacle by pipeline, be provided with rock core in the described core holding unit, the pipeline of second opening of the described intermediate receptacle of connection and the 3rd opening of described core holding unit is provided with switch portion, and described switch portion is near described second opening;
PTO is connected with first opening of described intermediate receptacle by pipeline, be used for exporting different driving pressures with the displacing fluid of the described intermediate receptacle of displacement via the rock core of pipeline transmission to the core holding unit;
Device for pressure measurement, comprise tensimeter, a U type pipe pressure meter and the 2nd U type pipe pressure meter, described manometric range is greater than the range of a described U type pipe pressure meter, and the range of a described U type pipe pressure meter is greater than the range of described the 2nd U type pipe pressure meter;
Described tensimeter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of described manometric range and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures;
A described U type pipe pressure meter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of the range of a described U type pipe pressure meter and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures;
Described the 2nd U type pipe pressure meter, be connected with the 3rd opening of described core holding unit by pipeline, be used for when the 3rd cracking pressure of the range of described the 2nd U type pipe pressure meter and described core holding unit is complementary, start according to external trigger, to measure the 3rd cracking pressure of described core holding unit under different driving pressures; And be in liquid level in closed condition and described the 2nd U type pipe pressure meter and reach when stablizing when described driving pressure is reduced to minimum value, described switch portion, show that the liquid level difference is to obtain the starting pressure of described rock core;
Flow measurement device is connected with the 4th opening of described core holding unit by pipeline, is used to measure under different described the 3rd cracking pressures the volume of the displacing fluid that goes out from described rock core seepage flow.
5. measuring system according to claim 4 is characterized in that:
A described U type pipe pressure meter comprises mercury slug U type pipe pressure meter; Described the 2nd U type pipe pressure meter comprises water column U type pipe pressure meter or kerosene post U type pipe pressure meter.
6. measuring system according to claim 4 is characterized in that,
Described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure score are not connected with the 3rd opening pipeline of described core holding unit by first switch portion, second switch portion and the 3rd switch portion.
7. according to each described measuring system among the claim 4-6, it is characterized in that described flow measurement device comprises at least one capillary flowmeter; When described flow measurement device comprises more than one capillary flowmeter, on the pipeline of the 4th opening that connects each capillary flowmeter and described core holding unit, be respectively arranged with switch portion.
8. measuring system according to claim 7 is characterized in that the porch of described capillary flowmeter also is provided with seal element.
9. the measuring method of a low-speed non-linear seepage parameters is characterized in that, described method comprises:
By the different pressure of PTO output with the displacing fluid in the displacement intermediate receptacle via the rock core of pipeline transmission to the core holding unit;
By the device for pressure measurement that is connected with the 3rd opening of described core holding unit with pipeline, the 3rd cracking pressure of measurement described core holding unit under different driving pressures, described device for pressure measurement comprises tensimeter and U type pipe pressure meter, and described manometric range is greater than the range of described U type pipe pressure meter;
According to the 3rd cracking pressure of described core holding unit and the matching result of described tensimeter and described U type pipe pressure meter range separately, start one of them of described tensimeter and U type pipe pressure meter;
By the flow measurement device that is connected with the 4th opening of described core holding unit with pipeline, the volume of the displacing fluid that under different described the 3rd cracking pressures, goes out from described rock core seepage flow according to the Preset Time linear measure longimetry;
When described driving pressure is reduced to minimum value, close switch portion near second opening of described intermediate receptacle, it is poor to obtain the liquid level that the liquid level in the described U type pipe pressure meter reaches when stablizing, and obtains the starting pressure of described rock core according to described liquid level difference.
10. the measuring method of a low-speed non-linear seepage parameters is characterized in that, described method comprises:
By the different pressure of PTO output with the displacing fluid in the displacement intermediate receptacle via the rock core of pipeline transmission to the core holding unit;
By the device for pressure measurement that is connected with the 3rd opening of described core holding unit with pipeline, the 3rd cracking pressure of measurement described core holding unit under different driving pressures, described device for pressure measurement comprises tensimeter, a U type pipe pressure meter and the 2nd U type pipe pressure meter, described manometric range is greater than the range of a described U type pipe pressure meter, and the range of a described U type pipe pressure meter is greater than the range of described the 2nd U type pipe pressure meter;
According to the 3rd cracking pressure of described core holding unit and the matching result of described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure meter range separately, start one of them of described tensimeter, a described U type pipe pressure meter and described the 2nd U type pipe pressure meter three, close among the above-mentioned three other both;
By the flow measurement device that is connected with the 4th opening of described core holding unit with pipeline, the volume of the displacing fluid that under different described the 3rd cracking pressures, goes out from described rock core seepage flow according to the Preset Time linear measure longimetry;
When the driving pressure of described PTO output is reduced to minimum value, close switch portion near second opening of described intermediate receptacle, and it is poor to obtain the liquid level that the liquid level in described the 2nd U type pipe pressure meter reaches when stablizing, to obtain the starting pressure of described rock core according to described liquid level difference.
CN2010101649887A 2010-04-30 2010-04-30 Measuring system and method of low-speed non-linear seepage parameters CN101852714B (en)

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