CN203025067U - Low-osmosis rock sample permeability tester - Google Patents
Low-osmosis rock sample permeability tester Download PDFInfo
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- CN203025067U CN203025067U CN201220447429.1U CN201220447429U CN203025067U CN 203025067 U CN203025067 U CN 203025067U CN 201220447429 U CN201220447429 U CN 201220447429U CN 203025067 U CN203025067 U CN 203025067U
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Abstract
The utility model discloses a low-osmosis rock sample permeability tester. The low-osmosis rock sample permeability tester comprises a detection gas source (1), a pressure regulating valve (2), a pair of pressure sensors (3 and 4), a rock sample room (5), a fixed-volume room (7), a gas concentration detection device (8) and a central control unit (9), wherein the detection gas source (1) is connected with the rock sample room (5) through the pressure regulating valve (2); an outlet end of the rock sample room is connected with an inlet of the fixed-volume room (7); the gas concentration detection device (8) is connected with the fixed-volume room (7) and is used for detecting the gas concentration of the fixed-volume room (7); and an output end of the gas concentration detection device (8) is connected with the central control unit (9). The low-osmosis rock sample permeability tester disclosed by the utility model can test small gas flow so as to measure low-osmosis rock sample permeability and rock sample permeability under a covering condition of shale, mud shale, mud rocks, dense sand rocks and the like.
Description
Technical field
The utility model relates to a kind of core measurement instrument in geology field, and particularly, the utility model relates to a kind of hyposmosis rock sample permeability detector.
Background technology
In the steady state method rock sample permeability determination process in geology field, usually take Darcy's law as foundation design permeability detector.Existing analyzer mainly comprises source of the gas, pressure transducer, rock sample chamber, flowmeter and computing machine etc., wherein source of the gas provides the gas with certain pressure for analyzer, the gas that provides is on the one hand as measuring media, be used on the other hand applying confined pressure to the confined pressure cover of rock sample, be adjacent to assurance rock sample and confined pressure cover, and then prevent that gas from overlapping the contact position seepage from rock sample and confined pressure.Analyzer has two pressure transducers usually, and it is placed in respectively the two ends of rock sample chamber, a mensurated gas composition inlet pressure, and another is used for the mensurated gas composition top hole pressure.Rock sample chamber (also claiming clamper) is used for placing rock sample, and its inside is furnished with the confined pressure cover.Flowmeter is placed in the rear end of rock sample chamber, is used for flow through flow (also claiming gas flow) after rock sample of mensurated gas composition.Computing machine is used for the calculating of pressure, the isoparametric detection of flow and permeability etc.
In gas method (measuring media is gas) rock sample permeability determination process, gas flow is an important parameter to be measured.Precision and scope that gas meter is measured have determined the precision of permeability detector and the upper and lower bound of permeability determination.From automaticity, the mensuration of current gas flow is divided into flowmeter method, artificial soap foam (film) method and computing method three major types substantially.
The flowmeter method: on the gas circuit of the rear end of rock sample to be measured (measuring media outlet), the one group of flowmeter that range is not of uniform size that is connected in parallel flows through uninterrupted after rock sample according to measuring media, selects a kind of flowmeter automatically to measure the flow of measuring media.
Artificial soap foam (film) method: on the gas circuit of the rear end of rock sample to be measured (measuring media outlet), flow through uninterrupted after rock sample according to measuring media, select to connect the quantity tube of a certain specification, do a soap foam (film) at quantity tube one end, flow through one scale period used, the flow of computation and measurement medium according to the scale on quantity tube and soap foam (film).
Throttle capillary tube method: Pan Hao etc. (2003) disclose a kind of throttle capillary tube gas flow apparatus for automatically measuring, and its basis is the throttle capillary tube pressure versus flow regression testing method of setting up.Device is comprised of throttle capillary tube, pressure transducer, digital indicator and microcomputer.Throttle capillary tube is an internal diameter 0.05-0.07mm, the glass tube that length 40-70mm does not wait.Be arranged in rubber bush (confined pressure cover).Process and the principle of its test are: the first step, measure a batch sample with soap foam discharge method, and each sample has a pair of pressure differential and data on flows; Second step, same batch sample is tested with throttle capillary tube, shows on digital indicator that the force value that pressure transducer records, flow adopt the first step to record result, further can get the corresponding relation of throttle capillary tube condition downforce and flow; The 3rd step, the regression curve of build-up pressure and flow, and proofread and correct with standard specimen.In the 4th step, with the pressure versus flow regression curve input computing machine after calibration, the establishment corresponding software namely can calculate gas flow under certain pressure reduction by pressure versus flow regression curve relation.Rock sample permeability determination lower limit can reach 0.0001 * 10
-3um
2
Above-mentioned three class methods have been brought into play vital role in rock sample permeability determination process in the past, obtained good result.But along with the development of oil-gas exploration and development, great changes have all occured in permeability tested object and test condition.The one, the test job amount of the rock samples such as the shale that permeability is low, mud shale, mud stone, tight sand is more and more, the Compacted rock of these rock samples, poor permeability; The 2nd, the demand of covering permeability test under press strip spare also rolls up, when test, and along with the increase of covering pressure, the perviousness variation of rock sample.Gas vent flow under both of these case is all very low, even near 0.0001ml/min(permeability 0.00001 * 10
-3um
2), the defective of existing three class methods is:
The flowmeter method: existing flowmeter detects lower limit far above 0.0001ml/min, can not satisfy the needs of above-mentioned Micro airflow measurement.
Artificial soap foam (film) method: the one, carrying out the low-permeability rock samples such as shale, mud shale, mud stone and tight sand when measuring, soap foam (film) is mobile reaches steady state (SS) often needs for a long time, inefficiency.The 2nd, this method requires high to operating environment, as, the switch door and window all has certain influence to soap foam (film) is mobile, easily produces measuring error.The 3rd, in the manually-operated process, timing easily produces personal error.
Throttle capillary tube method: although its rock sample permeability determination lower limit reaches 0.0001 * 10
-3um
2, but to some more the permeability of hyposmosis rock sample still be difficult to measure.
In a word, permeability detector with existing flow determining method design, due to the needs that are difficult to satisfy Micro airflow measurement, cause the hyposmosis rock sample permeability determination such as shale, mud shale, mud stone and tight sand and cover rock sample permeability determination difficulty under press strip spare, be starved of a kind of hyposmosis rock sample permeability detector.
The utility model content
Be difficult to measure small gas flow in order to solve existing permeability detector, cause the hyposmosis rock sample permeabilities such as shale, mud shale, mud stone and tight sand be difficult to measure and covering the problem that under press strip spare, the rock sample permeability is difficult to measure, the utility model provides a kind of hyposmosis rock sample permeability detector, can record the permeability of hyposmosis rock sample.
A kind of hyposmosis rock sample permeability detector of the present utility model, it comprises and detects source of the gas 1, pressure regulator valve 2, a pair of pressure transducer 3 and 4, rock sample chamber 5, constant volume chamber 7, gas concentration detection apparatus 8 and central control unit 9;
Described detection source of the gas 1 is connected with described rock sample chamber 5 by pressure regulator valve 2, and the endpiece of described rock sample chamber is connected with the entrance of described constant volume chamber 7; Described gas concentration detection apparatus 8 is connected with described constant volume chamber 7, is used for surveying the gas concentration of described constant volume chamber 7; The output terminal of described gas concentration detection apparatus 8 is connected with described central control unit 9;
Described a pair of pressure transducer 3,4 is separately positioned on the porch of described rock sample chamber 5 and the exit of constant volume chamber 7; And this output terminal to pressure transducer 3,4 is connected with described central control unit 9 respectively.
Described analyzer also comprises the confined pressure unit, and described confined pressure unit comprises confined pressure source of the gas 10 and confined pressure cover; Described confined pressure cover arranges in described rock sample chamber 5, and rock sample 6 to be measured is arranged in described confined pressure cover; The output terminal of described confined pressure source of the gas 10 is connected with described rock sample chamber 5.
Measurement gas medium in described detection source of the gas 1 is helium or sulfur hexafluoride.
One end of described constant volume chamber 7 communicates with atmosphere and its volume is fixed; The inner wall smooth of described constant volume chamber 7.
Described analyzer also comprises barometer, and described barometer is connected with described central control unit; Described central control unit is process chip or computing machine, is used for sensor-lodging, and analytical calculation output data;
Described gas concentration detection apparatus 8 is a kind of in SCHUTZ type infrared gas detector, LLD-100 type Laser Photoacoustic Spectroscopy gas detecting instrument or MIC-500 helium detection instrument.
Enter the gaseous tension scope of measuring media of described rock sample chamber 5 at 0.1-0.2Mpa; The applied pressure of described confined pressure cover is 1.5MPa.
Be provided with gas drier between described pressure regulator valve 2 and rock sample chamber 5, described gas drier is the vitlab drying tube.
it comprises detection source of the gas 1, pressure regulator valve 2, pressure transducer 3, pressure transducer 4, rock sample chamber 5 and computing machine 9, the entrance and exit of described rock sample chamber 5 is respectively arranged with pressure transducer 3 and pressure transducer 4, described pressure transducer 3 all is connected with computing machine 9 with pressure transducer 4, described detection source of the gas 1 is connected with pressure regulator valve 2 and then is connected with the pressure transducer 3 of these rock sample chamber 5 entrances settings, described rock sample chamber 5 separately is connected with confined pressure source of the gas 10, be provided with the confined pressure cover in this rock sample chamber 5, place rock sample 6 in this confined pressure cover, described hyposmosis rock sample permeability detector is characterised in that: the pressure transducer 4 that chamber 5 outlets of this rock sample arrange is connected with constant volume chamber 7, this constant volume chamber 7 volumes are fixed and communicate with atmosphere, this constant volume chamber 7 is connected with gas concentration detection apparatus 8, this gas concentration detection apparatus 8 is connected with computing machine 9.
Described detection source of the gas 1 is special gas, can be helium (content in atmosphere is the 5ppm left and right) or sulfur hexafluoride etc. as the special gas of measuring media, and these gas properties are stable and be easy to detect.Described gas pressure regulating valve 2 is used for the adjustment of gaseous tension.Described pressure transducer 3 and pressure transducer 4 are for detection of the gaseous tension of rock sample chamber 5 entrance and exits.Described rock sample chamber 5 also referred to as clamper, is used for placing rock sample 6, and is connected with confined pressure source of the gas 10.Described constant volume chamber 7 is arranged on gas circuit after rock sample chamber 5, and its inner wall smooth also communicates with atmosphere so that its with flow through the measuring media of coming and mix, measure and mix the concentration of measuring media afterwards.If obstructed atmosphere, constant volume chamber 7 is airtight, in the situation that airtight, the measuring media of coming is more and more along with flowing through, and the pressure of confined space can raise, and is unfavorable for detecting.Described gas concentration detection apparatus 8, also can be sensor, for detection of the concentration of the measuring media by rock sample chamber 5 in the constant volume chamber, accuracy of detection, the sensing range of the 8 pairs of measuring media of gas concentration detection apparatus that adopt are satisfied the demand and are got final product, such as, the volume of constant volume chamber is 10cm
3The time, require the range of gas concentration detection apparatus to be at least 0-1000ppm, accuracy of detection is not less than 2% of full scale.computing machine 9 is used for the pressure data collection, gas concentration detects data and processes and flow, computing permeability etc., confined pressure source of the gas 10 is pressure-air, described pressure-air refers to the pressure-air in steel cylinder of being stored in through processing such as dewatering, usually the pressure that has the 1-20Mpa left and right, the pressure-air that preferably has 15Mpa pressure, the pressure of above-mentioned air is by the regulator regulation and control on steel cylinder, above-mentioned confined pressure source of the gas 10 is connected with rock sample chamber 5, be used for exerting pressure to the confined pressure cover of rock sample chamber 5, usually need add the pressure of 1.5Mpa, make the confined pressure cover pack tightly the outer wall of rock sample 6, prevent that measuring media between rock sample 6 and confined pressure cover, seepage occuring.
Described detection source of the gas 1, namely measuring media is one of principal element that affects measurement result, this is because 5 outlet effluent air flow is very little from the rock sample chamber, is difficult to use flowmeter survey, even is difficult to observation, is difficult to find.The simultaneously outlet of rock sample chamber 5 communicates with constant volume chamber 7, and this constant volume chamber 7 leads to atmosphere, and itself contains various gases in atmosphere.Therefore, measuring media should be chosen in the gas of the extremely low and stable in properties of content in atmosphere, perhaps non-existent gas in atmosphere, guarantee is in the situation that the measuring media flow of rock sample chamber 5 outlets is very little, still can cause the rising of measuring media concentration in the constant volume chamber, thereby easily observe and calculate its flow.Therefore the utility model is selected helium (content in atmosphere is the 5ppm left and right) or sulfur hexafluoride etc., and these gas natures are stable and be easy to detect.
The utility model gets outflow by measuring concentration, by following formula, concentration and flow is changed:
Q
o＝△N×V/△T （1）
Wherein,
Q
oBe exit gas flow, ml/s;
△ N is the variable quantity of constant volume chamber gas concentration, in the utility model, represents with ppm;
V is the volume of constant volume chamber, cm
3
△ T is the variable quantity of time, s.
In formula (1), △ N is in time T
1The time be carved into T
2During this period of time constantly, namely in time variable quantity △ T, the variable quantity of measuring media concentration in the constant volume chamber, variable quantity △ N=N
2-N
1, N
1T
1The concentration of measuring media in moment constant volume chamber, N
2T
2The concentration of measuring media in moment constant volume chamber.T
1, T
2Determine to be completed by the software in computing machine.
Then by measuring rock sample gas feed pressure, top hole pressure, atmospheric pressure, rock sample length, sectional area, gas viscosity data, calculate at last the permeability of rock sample with the computing permeability formula, the computing formula of permeability is:
Ka=2P
0Q
0μL/△PA(2P
0+△p) （2）；
Wherein,
P
0Be atmospheric pressure, its unit is MPa;
Q
0Be the flow of exit gas, its unit is mL/s;
μ is gas viscosity, and its unit is Pas;
L is the length of described rock sample, and its unit is cm;
A is the basal area of described rock sample, and its unit is cm
2
△ p is the pressure differential at rock sample two ends, and unit is MPa;
The course of work of the present utility model is as follows:
Regulate measuring media, namely detect the pressure of source of the gas 1, usually its pressure is adjusted to 0.1-0.2Mpa so that it by rock sample chamber 5, enters constant volume chamber 7, make the concentration of this measuring media in constant volume chamber 7 increase.Under the certain condition of running parameter (as the gaseous tension of measuring media, pressure, length of pipeline and the diameter etc. that confined pressure puts), measuring media (△ T, T within a certain period of time in constant volume chamber 7
2-T
1) the concentration amplitude (△ N, the △ N=N that rise
2-N
1) mainly be subjected to this gas in impact and the control of rock sample chamber 5 rates of discharge, rate of discharge is larger, within a certain period of time (△ T, T
2-T
1), amplitude (△ N, △ N=N that in the constant volume chamber, measuring media concentration raises
2-N
1) larger.Measure measuring media concentration by gas concentration detection apparatus 8, just can determine the rate of discharge of this gas in conjunction with formula (1).By the computer acquisition deal with data, and calculate the permeability of rock sample in conjunction with formula (1) and formula (2).
The utility model can be measured the flow of 0.0001ml/min, and its permeability limits can reach 0.00001 * 10
-3um
2, can realize the mensuration of the hyposmosis rock sample permeabilities such as shale, mud shale, mud stone and tight sand and cover the mensuration of rock sample permeability under press strip spare.Automaticity of the present utility model is high, impact that be subjected to human factor is little, and measuring accuracy and the efficient of rock sample permeability all increase.
Description of drawings
Fig. 1 is that the utility model hyposmosis rock sample permeability detector forms schematic diagram.
Description of reference numerals:
1 detects source of the gas; The 2-pressure regulator valve; 3,4-pressure transducer; 5-rock sample chamber; The 6-rock sample; 7-constant volume chamber 8-gas concentration detection apparatus; The 9-central control unit; 10-confined pressure source of the gas.
Embodiment
as shown in Figure 1, a kind of hyposmosis rock sample permeability detector of the present utility model, it comprises detection source of the gas 1, pressure regulator valve 2, pressure transducer 3, pressure transducer 4, rock sample chamber 5 and central control unit, as computing machine 9, the entrance and exit of described rock sample chamber 5 is respectively arranged with pressure transducer 3 and pressure transducer 4, described pressure transducer 3 all is connected with computing machine 9 with pressure transducer 4, described detection source of the gas 1 is connected with pressure regulator valve 2 and then is connected with the pressure transducer 3 of these rock sample chamber 5 entrances settings, described rock sample chamber 5 separately is connected with confined pressure source of the gas 10, be provided with the confined pressure cover in this rock sample chamber 5, place rock sample 6 in this confined pressure cover, described hyposmosis rock sample permeability detector is characterised in that: the pressure transducer 4 that chamber 5 outlets of this rock sample arrange is connected with constant volume chamber 7, this constant volume chamber 7 volumes are fixed and communicate with atmosphere, this constant volume chamber 7 is connected with gas concentration detection apparatus 8, this gas concentration detection apparatus 8 is connected with computing machine 9.Confined pressure source of the gas 10 is pressure-air, namely through the pressure-air in steel cylinder of being stored in of the processing such as dewater, the present embodiment adopts the pressure-air with 15Mpa pressure, be used for exerting pressure to the confined pressure cover of rock sample chamber 5, make the confined pressure cover pack tightly rock sample 6, prevent that measuring media between rock sample 6 and confined pressure cover, seepage occuring.
Concrete measuring process is as follows:
Claims (7)
1. hyposmosis rock sample permeability detector, it is characterized in that, it comprises detection source of the gas (1), pressure regulator valve (2), a pair of pressure transducer (3,4), rock sample chamber (5), constant volume chamber (7), gas concentration detection apparatus (8) and central control unit (9);
Described detection source of the gas (1) is connected with described rock sample chamber (5) by pressure regulator valve (2), and the endpiece of described rock sample chamber is connected with the entrance of described constant volume chamber (7); Described gas concentration detection apparatus (8) is connected with described constant volume chamber (7), is used for surveying the gas concentration of described constant volume chamber (7); The output terminal of described gas concentration detection apparatus (8) is connected with described central control unit (9);
Described a pair of pressure transducer (3,4) is separately positioned on the porch of described rock sample chamber (5) and the exit of constant volume chamber (7); And this output terminal to pressure transducer (3,4) is connected with described central control unit (9) respectively.
2. a kind of hyposmosis rock sample permeability detector according to claim 1 is characterized in that:
Described analyzer also comprises the confined pressure unit, and described confined pressure unit comprises confined pressure source of the gas (10) and confined pressure cover; Described confined pressure cover arranges in described rock sample chamber (5), and rock sample to be measured (6) is arranged in described confined pressure cover; The output terminal of described confined pressure source of the gas (10) is connected with described rock sample chamber (5).
3. a kind of hyposmosis rock sample permeability detector according to claim 1 is characterized in that:
Measurement gas medium in described detection source of the gas (1) is helium or sulfur hexafluoride.
4. a kind of hyposmosis rock sample permeability detector according to claim 1 and 2 is characterized in that:
One end of described constant volume chamber (7) communicates with atmosphere and its volume is fixed; The inner wall smooth of described constant volume chamber (7).
5. a kind of hyposmosis rock sample permeability detector according to claim 1 is characterized in that:
Described analyzer also comprises barometer, and described barometer is connected with described central control unit; Described central control unit is process chip or computing machine, is used for sensor-lodging, and analytical calculation output data;
Described gas concentration detection apparatus (8) is a kind of in SCHUTZ type infrared gas detector, LLD-100 type Laser Photoacoustic Spectroscopy gas detecting instrument or MIC-500 helium detection instrument.
6. a kind of hyposmosis rock sample permeability detector according to claim 1 and 2 is characterized in that:
Enter the gaseous tension scope of measuring media of described rock sample chamber (5) at 0.1-0.2Mpa; The applied pressure of described confined pressure cover is 1.5MPa.
7. a kind of hyposmosis rock sample permeability detector according to claim 1 is characterized in that:
Be provided with gas drier between described pressure regulator valve (2) and rock sample chamber (5), described gas drier is the vitlab drying tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220447429.1U CN203025067U (en) | 2012-09-04 | 2012-09-04 | Low-osmosis rock sample permeability tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220447429.1U CN203025067U (en) | 2012-09-04 | 2012-09-04 | Low-osmosis rock sample permeability tester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926184A (en) * | 2014-04-23 | 2014-07-16 | 中国海洋石油总公司 | Detection method for gas logging porosity of core and detection device thereof |
| CN109991144A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Epoxy sealing type measuring device for gas permeability |
| US10845322B2 (en) | 2019-01-31 | 2020-11-24 | King Fahd University Of Petroleum And Minerals | Method and apparatus for measuring capillary pressure and foam transport in porous media |
| CN112858108A (en) * | 2021-03-12 | 2021-05-28 | 中国石油大学(华东) | Convection and diffusion experimental device and method for variable sample cavity under temperature and pressure conditions |
-
2012
- 2012-09-04 CN CN201220447429.1U patent/CN203025067U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926184A (en) * | 2014-04-23 | 2014-07-16 | 中国海洋石油总公司 | Detection method for gas logging porosity of core and detection device thereof |
| CN109991144A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Epoxy sealing type measuring device for gas permeability |
| US10845322B2 (en) | 2019-01-31 | 2020-11-24 | King Fahd University Of Petroleum And Minerals | Method and apparatus for measuring capillary pressure and foam transport in porous media |
| CN112858108A (en) * | 2021-03-12 | 2021-05-28 | 中国石油大学(华东) | Convection and diffusion experimental device and method for variable sample cavity under temperature and pressure conditions |
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|---|---|---|---|
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130626 |
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| CX01 | Expiry of patent term |