CN1773246A - Diffusion coefficient analyzer - Google Patents
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- CN1773246A CN1773246A CN 200410090629 CN200410090629A CN1773246A CN 1773246 A CN1773246 A CN 1773246A CN 200410090629 CN200410090629 CN 200410090629 CN 200410090629 A CN200410090629 A CN 200410090629A CN 1773246 A CN1773246 A CN 1773246A
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Abstract
The present invention provides a diffusion coefficient measuring instrument, in the concrete, it relates to a device for measuring rock diffusion coefficient. Said measuring instrument includes rock sample diffusion device, pressure balance device, pressure pump and vacuum pump. Said rock sample diffusion device, includes core chamber, rock sample sealing cover, diffusion chamber, plunger, plunger-pulling bar, end cover, regulating screw rod and fixing frame. Besides, said invention also provides the working principle of said diffusion coefficient measuring instrument.
Description
Technical field:
The present invention relates to the experimental provision in a kind of oil-gas exploration, be specifically related to a kind of device of measuring the rock coefficient of diffusion.
Background technology:
Rock gas is a kind of universal phenomenon in underground diffusion, it has been recognized that the diffusion of rock gas in sedimentary type formations is very important, for oil-gas exploration need be measured the coefficient of diffusion of hydrocarbon gas in the deposition rock.Measuring coefficient of diffusion and will cause concentration difference at the rock sample two ends, eliminate the pressure differential at rock sample two ends simultaneously, is that the concentration diffusion produces to guarantee the diffusion result who measures, rather than the pressure differential osmosis that causes produces.Therefore need special experimental provision.
In the prior art, external representative, report that more perfect diffusion experiment method is to be set up in 1987 by the people such as Krooss.B of Germany, but this method experimental pressure is very low, can only measure under normal pressure, and radially can not apply confined pressure to rock sample, experimental temperature is the highest has only 70 ℃, therefore compare with the geologic condition of reality, differ greatly, be difficult to satisfy diffusion modeling experiments and require.
Disclosed Chinese patent ZL94224552.0 of nineteen ninety-five " a kind of measurement mechanism of rock coefficient of diffusion " discloses a kind of technology of measuring the rock coefficient of diffusion, sees Fig. 4.Among the figure: sample valve 101, diffuser casing 102, rock core 103, gas chromatograph 104, core holding unit 105, diffuser casing 106, constant temperature oven 107, valve 108, gas path device 109, valve 110.The core holding unit structural drawing of this patent of Fig. 5, among the figure: plug 111,114, rubber gum cover 112 is adjusted piece 113.
The measurement mechanism of this structure, though it is simple in structure, detect the gas sample prescription just, but core holding unit crucial in the device has weak point: the core holding unit of this structure, behind the rock sample of the saturation water of packing into, in the process that rock sample two ends diffuser casing is vacuumized, make the saturation water loss at least 30% in the rock sample hole, even reaching 80%, this is very disadvantageous to the diffusion experiment simulation stratum condition.
In addition, in April, 1994, in " poly-transient equilibrium of natural fate and application thereof " book that petroleum industry publishing house publishes a kind of technology of measuring the rock coefficient of diffusion is disclosed also.In Dec, 1997, the technology of another kind of mensuration rock coefficient of diffusion is also disclosed in " oil-gas migration and be gathered into the Tibetan pattern " book that publishing house of Hohai University publishes.Core apparatus core holding unit in these two kinds of technology as No. 94224552.0 patents, begins from the core holding unit two ends simultaneously the vacuum, to make the saturation water loss in the rock sample hole serious to two diffuser casings in experiment.
Summary of the invention:
The technical problem to be solved in the present invention is:
In the prior art, rock sample makes the saturation water loss in the rock sample hole in vacuum, had a strong impact on the authenticity of diffusion experiment simulation stratum condition and the accuracy of experimental result; Owing to gas in the inflation pressure process contacts with the rock sample both ends of the surface all the time, make the bigger pressure differential of moment that produces because of inevitable pressure surge can easily produce little infiltration of moment simultaneously, influence the measuring accuracy of coefficient of diffusion the part rock sample.
Technical scheme of the present invention is:
A kind of diffusion coefficient analyzer comprises rock sample diffusion device 18, pressure equaliser 15, forcing pump 12, vacuum pump 11.
Rock sample diffusion device 18 is connected in parallel with pressure equaliser 15 by the gas piping at two ends, and can connect with two kinds of sources of the gas respectively.A common end source of the gas is a nitrogen, and the other end is a hydrocarbon gas, as rock gas, methane, ethane, ethene, acetylene, propane, propylene, butane, butylene etc., and C1～C5 component and composition thereof.
Forcing pump 12 is communicated with the confined pressure mouth 49 that adds of rock sample diffusion device 18, and being used for increases confined pressure to rock sample, plays the effect of simulated formation pressure.
Vacuum pump 11 connects respectively with the gas piping at rock sample diffusion device two ends, is used for left and right diffuser casing is vacuumized.
Described rock sample diffusion device 18 comprises core chamber 27, rock sample sealing shroud 30, left end diffuser casing 25, right-hand member diffuser casing 40, left plunger 50, right plunger 51, left plunger pull bar 21, right plunger pull bar 36, left end cap 22, right end cap 32, regulates screw mandrel 44, fixed mount 41.
Described rock sample sealing shroud 30 is cylindric, and two end faces of rock sample sealing shroud are flange plate-like end faces; Rock sample 28 places within the rock sample sealing shroud 30, and rock sample sealing shroud 30 places the inner chamber of core chamber 27.
Have in the core chamber 27 and add confined pressure mouth 49 and be communicated with inner chamber.Forcing pump 12 pumps into liquid and adds confined pressure mouth 49, to applying confined pressure in the cavity between core chamber 27 and the rock sample sealing shroud 30, because rock sample sealing shroud 30 external cylindrical surface pressurizeds, force the inner cylinder face of rock sample sealing shroud 30 to be close to the external cylindrical surface of tested rock sample 28, thereby make being sealed between rock sample and the rock sample sealing shroud keep in the experimentation not leaking.This confined pressure has played the effect of simulated formation pressure again simultaneously.Add the used liquid of confined pressure and be generally water.
The right side ring flange of left end diffuser casing 25 and the left side ring flange of right-hand member diffuser casing 40 connect with the two ends of core chamber 27 respectively, and with bolt 26 locking, two flange plate-like end faces of rock sample sealing shroud are clamped between the flange of above-mentioned two diffuser casings and core chamber 27.Make gas can be sealed in the diffuser casing inner chamber, guarantee that simultaneously the liquid that can not of generation confined pressure drains to the inner chamber of core chamber and diffuser casing.
Measuring initial period, left plunger 50 withstands on the left side of rock sample 28, makes rock sample and left end diffuser casing 25 isolated; Measuring follow-up phase, be moved to the left, the left side of rock sample 28 is communicated with the inner chamber of left end diffuser casing 25 by the left plunger 50 of left plunger pull bar 21 pullings;
Symmetry is being measured initial period with it, and right plunger 51 withstands on the right side of rock sample 28, makes rock sample and right-hand member diffuser casing 40 isolated; Measuring follow-up phase, moving right, rock sample 28 is communicated with the inner chamber of right-hand member diffuser casing 40 by the right plunger 51 of right plunger pull bar 36 pullings.
When two diffuser casings are vacuumized simultaneously, because the protection of plunger, avoid saturation water in the rock sample hole to be taken out and lose.Two diffuser casings are being inflated simultaneously in pressurising and the diffusion pressure adjustment process simultaneously, can be because of the generation of instantaneous pressure difference, and cause the effect of pressure differential to the little infiltration of rock sample, promptly avoid the direct effect of pressure differential to the rock sample hole.
The outside of left end diffuser casing 25 and right-hand member diffuser casing 40 is respectively by left end cap 22 and right end cap 32 sealings.The cylinder of left side plunger pull bar 21 and right plunger pull bar 36 passes left and right end cap in the slipper seal mode respectively, and this slipper seal is generally sealing gasket or other known conventional seal form.Moving by regulating screw mandrel 44 of left and right plunger pull bar drives synchronous shift.
The gas piping at rock sample diffusion device 18 two ends can also be got gas sample valve 7 respectively and get gas sample valve 8, by getting gas sample valve, can be connected with gas chromatography respectively; What replace getting gas sample valve also can be other known samplers, as the syringe sample tap etc.Be used to measure rock sample two ends gas concentration and change, thereby calculate coefficient of diffusion.
Generally speaking, rock sample diffusion device 18 left end gas pipings are connected with threeway, and this threeway one end and orifice valve 9, solenoid valve 3 are connected in series, and are connected with hydrocarbon gas source 1 again; This threeway other end is connected with solenoid valve 5, connects vacuum pump 11 again; Rock sample diffusion device 18 right-hand member gas pipings are connected with threeway equally, and this threeway one end and orifice valve 10, solenoid valve 4 are connected in series, and are connected with source nitrogen 2 again; This threeway other end is connected with solenoid valve 6, connects vacuum pump 11 again.
Forcing pump 12 and add and also have stop valve 16 and pressure unit 13 on the pipeline between the confined pressure mouth 49 usually, or tensimeter.
Rock sample diffusion device 18 generally places within the constant temperature oven 17, and constant temperature oven 17 mainly comprises temperature transmitter, heating wire, micromotor, the time relay, and control circuit etc., constant temperature oven can be any known conventionally forms.
Rock sample diffusion device 18 also has regulating sleeve 31, and its effect is to work as the length of rock sample not simultaneously, can the adjusting play.
Described rock sample diffusion device 18 also comprises: left and right pressure ring 34, left and right pressure cap 35 and 47, left and right end cap 22 and 32, left and right end cap nut 24 and 39, be fixed in the left and right baffle plate 46 and 37 on the left and right plunger pull bar, be enclosed within the baffle plate nut 45 and 38 of regulating on the screw mandrel 44 and driving left and right baffle plate; Copper sheathing 42 and 43, the O-ring seal 29 of plunger excircle, the O-ring seal 23 between diffuser casing and the end cap; Sealing gasket 33 and 48 between left and right plunger pull bar and the left and right end cap.
When vacuumizing, inflate pressurising and the diffusion pressure adjustment finishes, screw mandrel 44 is regulated in rotation, make left plunger pull bar 21 and right plunger pull bar 36 synchronously outwards about translation 15mm, thereby make the end face of two plungers break away from the rock sample end face, rock sample is communicated with the inner chamber of two diffuser casings, and the gas on both sides touches two end faces of rock sample respectively.
The material of described rock sample sealing shroud 30 generally is the fluororubber of soft, do not get rid of yet and uses other rubber, or conventional material similar, that gas penetration potential is little and energy is withstand voltage.
Pressure equaliser 15 is parts, and its effect is to make the residual pressure difference in the diffuser casing of rock sample two ends as far as possible little, and the diffusion during with the assurance experiment is produced by concentration difference fully, rather than produce by pressure differential.Pressure equaliser 15 can be a known conventional components, for example the gas path device among the Chinese patent ZL94224552.0 or other same base parts; Also can replace with custom-designed balance device; Perhaps can replace with the novel features that occurs later on.Pressure equaliser 15 is not inventive point of the present invention place, as long as can play the balance pressure at two ends, reduces the effect of residual pressure difference, can use, and does not influence other technologies feature of the present invention.
Each solenoid valve all can be controlled by computing machine, makes this device realize robotization, and control mode is known routine techniques.
The invention has the beneficial effects as follows:
Because the protection of plunger; guarantee in the diffusion experiment process; the not dehydration of rock sample of saturation water; rock sample can not cause the generation of rock sample moment infiltration because of the generation of instantaneous pressure difference; simulate formation gas reservoir actual diffusion in very long geologic history preferably, thus the authenticity of diffusion experiment simulation stratum condition and the accuracy of experimental result improved greatly.Make sampling and operation automation, the measuring accuracy height.
Description of drawings:
Fig. 1 is a kind of system schematic of diffusion coefficient analyzer.
Fig. 2 is the structural drawing of rock sample diffusion device.
Fig. 3 is the synoptic diagram of rock sample sealing shroud.
Fig. 4 is the prior art system synoptic diagram.
Fig. 5 is the core holding unit system construction drawing of prior art.
Embodiment:
Below describe and only represent a kind of embodiment of the present invention,, and do not limit the invention just for further the present invention will be described.
A kind of diffusion coefficient analyzer comprises rock sample diffusion device 18, pressure equaliser 15, forcing pump 12, vacuum pump 11.Rock sample diffusion device 18 is connected in parallel with pressure equaliser 15 by the gas piping at two ends, and is connected with hydrocarbon gas source with source nitrogen respectively through orifice valve, solenoid valve.Forcing pump 12 is communicated with the confined pressure mouth 49 that adds of rock sample diffusion device 18 by stop valve and pressure unit, and vacuum pump 11 connects respectively by the gas piping of solenoid valve with the rock sample diffusion device two ends.
The highest 5MPa of aero operating pressure in this device, the highest 60MPa of confined pressure, experimental temperature is the highest 200 ℃.
Rock sample diffusion device 18 comprises the rock sample sealing shroud 30 of core chamber 27, rubber system, left and right end diffuser casing, left and right plunger, left and right plunger pull bar, left and right end cap, regulates screw mandrel, fixed mount, regulating sleeve, pressure ring, left and right pressure cap, left and right end cap nut, left and right baffle plate, baffle plate nut, copper sheathing, O-ring seal, sealing gasket.
Rock sample diffusion device places in the constant temperature oven, and constant temperature oven comprises temperature transmitter, heating wire, micromotor, the time relay, control circuit.
The gas piping at rock sample diffusion device 18 two ends is connected with gas chromatography by getting gas sample valve, can regularly get the gas sample chromatography of supplying gas and detect.
When vacuumizing, inflate pressurising and the diffusion pressure adjustment finishes, screw mandrel 44 is regulated in rotation, makes left plunger pull bar 21 and right plunger pull bar 36 synchronously outwards about translation 15mm, thereby makes the end face of two plungers break away from the rock sample end face.
Rock sample diffusion device 18 of the present invention is compared with the core holding unit of prior art, and the two structure is different fully.Rock sample sealing shroud 30 shapes of the present invention are compared with the rubber sealing boot of prior art, and the two shape is also different fully.
Each solenoid valve in this device all can be controlled by computing machine, makes this device realize robotization.
Claims (8)
1 one kinds of diffusion coefficient analyzers comprise rock sample diffusion device (18), pressure equaliser (15), forcing pump (12), vacuum pump (11); It is characterized in that:
Rock sample diffusion device (18) is connected in parallel with pressure equaliser (15) by the gas piping at two ends, and connects with two kinds of sources of the gas respectively; Forcing pump (12) is communicated with the confined pressure mouth (49) that adds of rock sample diffusion device (18); Vacuum pump (11) connects respectively with the gas piping at rock sample diffusion device two ends;
Described rock sample diffusion device (18) comprises core chamber (27), rock sample sealing shroud (30), left end diffuser casing (25), right-hand member diffuser casing (40), left plunger (50), right plunger (51), left plunger pull bar (21), right plunger pull bar (36), left end cap (22), right end cap (32), regulates screw mandrel (44), fixed mount (41);
Described rock sample sealing shroud (30) is cylindric, and two end faces of rock sample sealing shroud are flange plate-like end faces; Rock sample (28) places within the rock sample sealing shroud (30), and rock sample sealing shroud (30) places the inner chamber of core chamber (27);
Have in the core chamber (27) and add confined pressure mouth (49) and be communicated with inner chamber; The left side ring flange of the right side ring flange of left end diffuser casing (25) and right-hand member diffuser casing (40) connects with the two ends of core chamber (27) respectively, and with bolt (26) locking, two flange plate-like end faces of rock sample sealing shroud are clamped between the flange of above-mentioned two diffuser casings and core chamber (27);
Measuring initial period, left plunger (50) withstands on the left side of rock sample (28), makes rock sample and left end diffuser casing (25) isolated; Measuring follow-up phase, spur left plunger (50) by left plunger pull bar (21) and be moved to the left, the left side of rock sample (28) is communicated with the inner chamber of left end diffuser casing (25);
Measuring initial period, right plunger (51) withstands on the right side of rock sample (28), makes rock sample and right-hand member diffuser casing (40) isolated; Measuring follow-up phase, spur right plunger (51) by right plunger pull bar (36) and move right, rock sample (28) is communicated with the inner chamber of right-hand member diffuser casing (40);
By left end cap (22) and right end cap (32) sealing, the cylinder of left plunger pull bar (21) and right plunger pull bar (36) passes left and right end cap in the slipper seal mode respectively respectively in the outside of left end diffuser casing (25) and right-hand member diffuser casing (40); Moving by regulating screw mandrel (44) of left and right plunger pull bar drives.
2 diffusion coefficient analyzers according to claim 1 is characterized in that: the gas piping at rock sample diffusion device (18) two ends is got gas sample valve (7) respectively and is got gas sample valve (8).
3 diffusion coefficient analyzers according to claim 1 is characterized in that: rock sample diffusion device (18) left end gas piping is connected with threeway, and this threeway one end and orifice valve (9), solenoid valve (3) are connected in series, and is connected with hydrocarbon gas source (1) again; This threeway other end connects vacuum pump (11) again by solenoid valve (5); Rock sample diffusion device (18) right-hand member gas piping is connected with threeway equally, and this threeway one end and orifice valve (10), solenoid valve (4) are connected in series, and is connected with source nitrogen (2) again; This threeway other end is connected with solenoid valve (6), connects vacuum pump (11) again.
4 diffusion coefficient analyzers according to claim 1 is characterized in that: forcing pump (12) and add and also have stop valve (16) and pressure unit (13) on the pipeline between the confined pressure mouth (49).
5 diffusion coefficient analyzers according to claim 1 is characterized in that: rock sample diffusion device (18) places within the constant temperature oven (17).
6 diffusion coefficient analyzers according to claim 1, it is characterized in that: described rock sample diffusion device (18) also comprises: regulating sleeve (31), pressure ring (34), left and right pressure cap (35) and (47), left and right end cap nut (24) and (39), be fixed on left and right baffle plate (46) and (37) on the left and right plunger pull bar, be enclosed within adjusting screw mandrel (44) and go up and drive baffle plate nut (45) and (38) that left and right baffle plate moves; Copper sheathing (42) and (43), the O-ring seal of plunger excircle (29), the O-ring seal between diffuser casing and the end cap (23); Sealing gasket (33) and (48) between left and right plunger pull bar and the left and right end cap.
7 diffusion coefficient analyzers according to claim 1 is characterized in that: the material of described rock sample sealing shroud (30) is the fluororubber of soft.
8 diffusion coefficient analyzers according to claim 3 is characterized in that: described solenoid valve is controlled by computing machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100906296A CN100437082C (en) | 2004-11-10 | 2004-11-10 | Diffusion coefficient analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100906296A CN100437082C (en) | 2004-11-10 | 2004-11-10 | Diffusion coefficient analyzer |
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| CN1773246A true CN1773246A (en) | 2006-05-17 |
| CN100437082C CN100437082C (en) | 2008-11-26 |
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| CNB2004100906296A Expired - Lifetime CN100437082C (en) | 2004-11-10 | 2004-11-10 | Diffusion coefficient analyzer |
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| CN100451605C (en) * | 2006-09-06 | 2009-01-14 | 何满潮 | Tester for testing earth formation deep soft rock water logic effect |
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| US5069065A (en) * | 1991-01-16 | 1991-12-03 | Mobil Oil Corporation | Method for measuring wettability of porous rock |
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| CN2188205Y (en) * | 1993-10-22 | 1995-01-25 | 西南石油学院 | Rock physical property parameter testing device |
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