CN102879303A - Device and method for testing diffusion performance of oil-gas components in pore medium - Google Patents
Device and method for testing diffusion performance of oil-gas components in pore medium Download PDFInfo
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- CN102879303A CN102879303A CN2012103450701A CN201210345070A CN102879303A CN 102879303 A CN102879303 A CN 102879303A CN 2012103450701 A CN2012103450701 A CN 2012103450701A CN 201210345070 A CN201210345070 A CN 201210345070A CN 102879303 A CN102879303 A CN 102879303A
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Abstract
The invention provides a device and a method for testing diffusion performance of oil-gas components in a pore medium. The testing device comprises a communicating valve, wherein the communicating valve is clamped between testing cores in a core clamping device; the testing cores are arranged on two sides of the communicating valve; the communicating area of the communicating valve is more than or equal to 1/2 of the cross sectional area of the testing cores; fluid can be respectively injected into the testing cores which are positioned on the two sides of the communicating valve through the clamping device; and the testing cores positioned on the two sides of the communicating valve are controlled to be communicated with or separated from each other through the communicating valve. Because the communicating valve is arranged between the two testing cores, the initial diffusion moment of the components can be strictly controlled, and the measurement accuracy is improved; static diffusion property measurement under pore medium conditions can be realized; and moreover, the reaction can be stopped and other fluid involved testing research can be carried out according to the design under control of the valve.
Description
Technical field
The invention belongs to the physical property of fluid field of measuring technique, be mainly concerned with diffusion of components performance test in the pore media, oil-gas component diffusion experimental provision and experimental technique in especially a kind of pore media.
Background technology
The diffusion test experiments of component is important research parameter in the main subject such as fluid mechanics, permeation fluid mechanics and gas dynamics between fluid.And the oil-gas component diffusion is the important foundation of oil reservoir conceptual design in the pore media, also is the important research parameter of oil-gas field development experiment.
At present, diffusion of components performance test process is complicated in the pore media, and performance accuracy is subjected to multifactor restriction, and this performance test is made slow progress in the oil-gas field development experimental study.The method of the diffusion of component enters in the pore media normally behind two kinds of fluid contacts in the research pore media at present, and the change of component of sample analysis each point position fluid reaches the purpose of monitoring scattering nature again.This method can effectively monitor the diffusion of components process, but has following drawback:
1, common experiment flow is monitored its diffusion process after requiring multiple fluid to enter pore media, and obviously this process is the process that dynamically spreads, and is subjected to the impact of driving force very large.Can't measure static scattering nature.
2, test process uncontrollable two kinds of fluid contact opportunitys, thereby test process has hysteresis to a certain degree, can't test the mechanism at diffusion of components initial stage.
3, experiment flow has determined that fluid namely contacted before entering hole usually, does not reflect the impact of pore media.
4, test process is continuous, can not end or introduce other reacting fluid, has limited going deep into of Research Thinking.
Because the defective that above-mentioned known technology exists, the inventor is according to the Production design experience of being engaged in for many years this area and association area, develop experimental provision and the experimental technique of oil-gas component diffusion in the test pore media of the present invention, the defective that exists to overcome above-mentioned known technology.
Summary of the invention
The purpose of this invention is to provide oil-gas component diffusion experimental provision and experimental technique in a kind of pore media, make fluid timing in pore media, decide the state contact by the valve control technology, realize the measurement of static diffusion.
For this reason, the present invention proposes oil-gas component diffusion experimental provision in a kind of pore media, it comprises: a communicating valve, be clamped in the both sides that the interior testing rock core of core holding unit is arranged on described communicating valve, and the connection area of described communicating valve is more than or equal to 1/2 of testing rock core area; Fluid can be injected into respectively the testing rock core that is positioned at described communicating valve both sides by described clamper, is positioned at connection or the separation of the testing rock core of its both sides by described communicating valve control.
The present invention also proposes oil-gas component diffusion experimental technique in a kind of pore media, comprising:
A utilizes oil-gas component diffusion experimental provision in the aforesaid pore media, is under the closed condition at described communicating valve, respectively the testing rock core that is arranged on the communicating valve both sides is vacuumized;
Saturated fluid process in B, the testing rock core, in the testing rock core that is arranged on described communicating valve one side, be filled with the first fluid, in the testing rock core of described communicating valve opposite side, be filled with the second liquid, and make the temperature of the fluid of the testing rock core that enters the communicating valve both sides, pressure identical;
C, open described communicating valve, make fluid steadily contact under identical pressure state of described communicating valve both sides;
Fluid sample in D, the timing extraction both sides testing rock core utilizes component analysis to calculate diffusion.
Compare with known technology, characteristics of the present invention and advantage are:
1. known experiment flow could be monitored its diffusion process after requiring multiple fluid to enter pore media (testing rock core), thereby test process has hysteresis to a certain degree, can't test the mechanism at diffusion of components initial stage; And the starting condition that different fluid reaches uniform temp pressure is difficult to control, and therefore the present invention can strictly control the diffusion of components initial time owing to be provided with communicating valve between two testing rock cores, and accuracy of measurement improves.
2. known experimental study is the process that dynamically spreads, and is subjected to the impact of driving force very large, can't measure static scattering nature.And known experiment flow has determined that fluid namely contacted before entering the hole of testing rock core, can not really reflect the impact of pore media; And device and method of the present invention provides the condition of fluid stable, can realize that the static scattering nature under the pore media condition is measured.
3. known experiment test process is continuous, can not end or introduce other reacting fluid, has limited going deep into of Research Thinking.And the present invention under the control of valve, can and carry out the testing research that other fluid is got involved according to the design stopped reaction when adopting controlled communicating valve.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the schematic diagram of the interior oil-gas component diffusion experimental provision of pore media of the present invention and method;
Fig. 2 is the structural representation of an embodiment of oil-gas component diffusion experimental provision in the pore media of the present invention, namely adopts the structure of controlled communicating valve;
Fig. 3 is the decomposing schematic representation of the controlled communicating valve of oil-gas component diffusion experimental provision in the pore media of the present invention;
Fig. 4 is that the sealed film master of controlled communicating valve of the present invention looks synoptic diagram;
Fig. 5 is that the valve block master of controlled communicating valve of the present invention looks synoptic diagram;
Fig. 6 is valve block and the outer rotor assembled state schematic side view of controlled communicating valve of the present invention;
Fig. 7 is that synoptic diagram is looked on the valve block left side of controlled communicating valve of the present invention;
Fig. 8 is that the ring gear master of controlled communicating valve of the present invention looks synoptic diagram;
Fig. 9 is the ring gear schematic side view of controlled communicating valve of the present invention;
Figure 10 is that the connecting end surface master between two valve bonnets that are oppositely arranged of controlled communicating valve of the present invention looks synoptic diagram, namely among Fig. 3 arrow A to synoptic diagram;
Figure 11 is that the compressing tablet master of controlled communicating valve of the present invention looks synoptic diagram;
Figure 12 is the structural representation of another embodiment of oil-gas component diffusion experimental provision in the pore media of the present invention, namely adopts the structure of a communicating valve;
Figure 13 is the decomposing schematic representation of a communicating valve of oil-gas component diffusion experimental provision in the pore media of the present invention;
Figure 14 is the application valve body structural representation of a communicating valve of the present invention;
Figure 15 is the diffusion of components test result comparison diagram that adopts the present invention and conventional experimental technique respectively a kind of rock core to be carried out;
Figure 16 is the diffusion of components test result comparison diagram that adopts the present invention and conventional experimental technique respectively another kind of rock core to be carried out.
The drawing reference numeral explanation:
1, communicating valve 10, controlled communicating valve 11,21, switching valve 111, sealed film
1111, the first vacancy section 1112, the first seal area 1113, sealing salient point 112, valve block
1121, the second vacancy section 1122, the second seal area 1123, through hole 12,22, control gear
121, outer rotor 122, ring gear 1221, arc long slot bore 123, valve rod
13,23, rock core post 13 ' rock core post pipe nipple 14, valve bonnet 15, mandrel
16, compressing tablet 17, seal ring set 20, communicating valve 21, elastic membrane
221, piston cylinder 222, guide part 2221, guide channel 2222, bell guide
223, piston 224, connecting rod 225, liquid injection pipe 231, accommodating body
2310, holding part 232, valve gap 24, orifice plate 3, testing rock core
4,5, core holding unit 51, power mouth 6, O-ring seal
Embodiment
Oil-gas component diffusion experimental provision in the pore media that the present invention proposes, comprise: a communicating valve, be clamped in the both sides that the interior testing rock core of core holding unit is arranged on described communicating valve, the connection area of described communicating valve is more than or equal to 1/2 of testing rock core cross-sectional area; Fluid can be injected into respectively the testing rock core that is positioned at described communicating valve both sides by described clamper, is positioned at connection or the separation of the testing rock core of its both sides by described communicating valve control.
Further, described communicating valve comprises the switching valve that is arranged between the two described testing rock cores, can controls two described testing rock cores connections or separate, the control gear that is connected with described switching valve, and the rock core post that connects described communicating valve and testing rock core, described rock core post is made by the rock with pore media or metal, and its two ends are resisted against respectively described testing rock core.
The present invention also proposes oil-gas component diffusion experimental technique in a kind of pore media, comprising:
A utilizes oil-gas component diffusion experimental provision in the aforesaid pore media, is under the closed condition at described communicating valve, respectively the testing rock core that is arranged on the communicating valve both sides is vacuumized;
Saturated fluid process in B, the testing rock core, in the testing rock core that is arranged on described communicating valve one side, be filled with the first fluid, in the testing rock core of described communicating valve opposite side, be filled with the second liquid, and make the temperature of the fluid of the testing rock core that enters the communicating valve both sides, pressure identical;
C, open described communicating valve, make fluid steadily contact under identical pressure state of described communicating valve both sides;
Fluid sample in D, the timing extraction both sides testing rock core utilizes component analysis to calculate diffusion.
The present invention is by arranging communicating valve between testing rock core, can strictly control the initial time of fluid components diffusion, increased substantially the accuracy of measuring, having overcome present known experiment flow is could monitor its diffusion process after multiple fluid enters testing rock core, thereby all there is hysteresis to a certain degree in existing method of testing, can't test the mechanism at diffusion of components initial stage; And device and method of the present invention is by the opening speed of control communicating valve, for the static scattering nature measurement to the pore media inner fluid provides condition.
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, feature and effect to oil-gas component diffusion experimental provision and experimental technique in the pore media of the present invention are described in detail as follows.In addition, by the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes more to be goed deep into concrete understanding to the present invention, however institute's accompanying drawing only provide with reference to and explanation usefulness, the present invention is limited.
Fig. 1 is schematic diagram of the present invention, and as shown in Figure 1, the present invention arranges a communicating valve 1 between two testing rock cores 3, and farthest reduces the Iinvalid volume of communicating valve, increases its connected surface, and the diffusion track when passing through communicating valve with the assurance fluid keeps stable.The direction of arrow is the dispersal direction that schematically shows a kind of fluid among the figure.Adopt device and method of the present invention, can realize static state diffusion and the dynamically test of two kinds of diffusion ways of diffusion, wherein, static diffusion: to the testing rock core post 3 interior injection fluids of communicating valve both sides, and the fluid that makes the communicating valve both sides has identical pressure, then stop the injection of fluid, open valve, the component concentration of monitoring communicating valve two side liquids under static state changes; Dynamically diffusion: to the testing rock core post 3 interior injection fluids of communicating valve both sides, and the fluid that makes the communicating valve both sides has identical pressure, then open valve, only in the testing rock core post of a side, continue to be filled with fluid, as shown in Figure 1, in flow process, the component concentration of Way out fluid is monitored in both sides fluid-phase counterdiffusion this moment.
Oil-gas component diffusion experimental provision such as Fig. 2, shown in Figure 12 in the pore media that the present invention proposes, it comprises: a communicating valve 1, be clamped in the both sides that core holding unit 4, the testing rock cores 3 in 5 are arranged on communicating valve 1, the connection area of communicating valve 1 is more than or equal to 1/2 of testing rock core 3 cross-sectional areas.Fluid can be injected into respectively the testing rock core 3 that is positioned at communicating valve 1 both sides by described clamper 4,5, is positioned at connection or the separation of the testing rock core 3 of its both sides by communicating valve 1 control.Because experimental provision of the present invention, the connection area that is arranged on the communicating valve 1 between two testing rock cores 3 is larger, therefore fluid is by behind the valve, its diffusion track can keep stable, the pore media inner fluid is being carried out effectively to reduce the impact of valve self structure convection cell diffusion of components effect in the situation of static scattering nature measurement by the valve realization.
Further, communicating valve 1 comprises the switching valve 11,21 that is arranged between two testing rock cores 3, can controls 3 connections of two testing rock cores or separate, the control gear 12,22 that is connected with switching valve 11,21, and the rock core post 13,23 that connects valve and testing rock core 3, this rock core post 13,23 is made by the rock with pore media or metal, its permeability is about 1 darcy, and rock core post 13,23 two ends are resisted against respectively testing rock core 3.
Please cooperate referring to Fig. 2 to Figure 10, in a feasible technical scheme, above-mentioned communicating valve 1 is controlled communicating valve 10, it comprises: two valve bonnets 14, two valve bonnets 14 are set in respectively on the two rock core posts 13, and control gear 12 can be arranged between the two described valve bonnets 14 rotationally, are connected with control gear 12 by the end of bolt with two valve bonnets 14, the other end of two valve bonnets 14 can be connected with core holding unit 4 respectively, consists of experimental provision of the present invention.Wherein, described core holding unit 4 can adopt known structure, and the link of itself and valve bonnet 14 is provided with the O-ring seal 6 that prevents fluid leakage.Core holding unit 4 is identical with syndeton and the known technology of testing rock core 3, does not repeat them here.
Further, such as Fig. 2, Fig. 3, shown in Figure 6, the switching valve 11 of controlled communicating valve 10 comprises sealed film 111, valve block 112.Wherein, valve block 112 is arranged between control gear 12 and one of them valve bonnet 14, and is fixedly connected with control gear 12.Sealed film 111 is oppositely arranged with valve block 112, is positioned at the end of a rock core post 13.
Wherein, such as Fig. 4, shown in Figure 5, sealed film 111 is provided with the first vacancy section 1111 and the first seal area 1112, valve block 112 is provided with the second vacancy section 1121 and the second seal area 1122, and the vacancy section 1111 that arranges respectively on sealed film 111 and the valve block 112,1121 and seal area 1112,1122 mutually corresponding, the outer rim of valve block 112 is same corresponding with sealed film 111, the connection by the controlled communicating valve 10 of control gear 12 realizations or close.
Concrete is that sealed film 111 is provided with a plurality of the first fan-shaped vacancy sections 1111 and the first seal area 1112, and the first vacancy section 1111 and the setting of the first seal area 1112 intervals; Valve block 112 be provided with sealed film 111 on the first vacancy section 1111 of arranging and the second vacancy section 1121 and the second seal area 1122 that the first seal area 1112 quantity equate, shape is identical.
The first seal area 1112 is provided with a plurality of spherical crown shape sealing salient points 1113, the second vacancy section 1121 forms a plurality of through holes 1123, the sealing salient point 1113 that arranges on arrange position and first seal area 1112 of through hole 1123 position of arranging is identical, and sealing salient point 1113 can form with described through hole 1123 and be sealed and matched; The second seal area 1122 is the plane.When sealing salient point 1113 embeds through hole 1123 when interior, the second seal area 1122 is corresponding with the first vacancy section 1111, and at this moment, controlled communicating valve is closed.
In a specific embodiment, sealed film 111 is made by adding fluororubber, and valve block 112 is made of metal, and for example this valve block 112 can be made by stainless steel, the surface correct grinding.
In addition, controlled communicating valve 10 also has a mandrel 15, and this mandrel 15 is arranged between the two rock core posts 13, and is fixedly connected with at least one rock core post 13 wherein, and certainly, the two ends of mandrel 15 also can be set respectively and are fixed in the two rock core posts 13.Sealed film 111, valve block 112, control gear 12 are located at respectively on the mandrel 15, and control gear 12 can be with moving valve plate 112 to rotate take mandrel 15 as the axle center.
In a specific embodiment, please cooperate referring to Fig. 3, Figure 11, be provided with a compressing tablet 16 between control gear 12 and another valve bonnet 14, sealed film 111, valve block 112, compressing tablet 16 all are set on the mandrel 15.
Described compressing tablet 16 has center pit 161, by this center pit 161 compressing tablet 16 is placed on the mandrel 15, and have two semicircle open-work districts 162 on the compressing tablet 16, when the first vacancy section 1111 of sealed film 111 and valve block 112, the 1121 corresponding connection of the second vacancy section, be positioned at the open-work district 162 of described compressing tablet 16, and make the area in this open-work district 162 should be large as much as possible, thereby can guarantee that controlled communicating valve has maximum connection area.
Further, be provided with seal ring set 17 between rock core post 13 and the valve bonnet 14, when by bolt two valve bonnets 14 being fastenedly connected, opening and closing to consist of between valve 11, control gear 12 and valve bonnet 14, the rock core post 13 and be tightly connected.
In a specific embodiment, the internal diameter of an end of described valve bonnet 14 close control gears 12 is greater than the internal diameter away from control gear one end, and the external diameter of described seal ring set 17 matches with the internal diameter of valve bonnet 14.Represented a feasible concrete example among Fig. 3, wherein, valve bonnet 14 endoporus form an end and match with the external diameter of rock core post 13, the diameter of the other end is greater than the external diameter of rock core post 13, and the junction of major diameter and minor diameter forms the excessive connecting portion of taper, described seal ring set 17 forms the external diameter that matches with valve bonnet 14 interior hole shapes, and namely an end forms the taper sealing ring set of undergauge.
In addition, control gear 12 comprises: gear set and valve rod 123 by outer rotor 121 and ring gear 122 consist of, in control gear 12, also be provided with rock core post pipe nipple 13 ', and this rock core post pipe nipple 13 ' is set on the mandrel 15.The outside of ring gear 122 is provided with described valve rod 123, and outer rotor 121 relatively mandrel 15 is sheathed on the rock core post pipe nipple 13 ' rotationally.Valve block 112 is fixedly connected with the end of described outer rotor 121 is coaxial, by at the outer rotor 121 interior rock core post pipe nipples 13 ' that arrange, is conducive to fluid and keeps original Diffusion Law.Certainly, rock core post 13 and rock core post pipe nipple 13 ' also can be set, but when controlled communicating valve 10 is connected with core holding unit 4, two testing rock cores 3 of both sides are inserted respectively in two valve bonnets 4, to open and close valve 11 and be arranged between two testing rock cores 3, and (in the outer rotor 121) arranges a testing rock core pipe nipple in control gear.
In a specific embodiment, outer rotor 121 forms the conical gear that is 45 ° of inclination angles with respect to axis, forms the internal tooth that matches with outer rotor 121 on the ring gear 122.
In addition, the outer peripheral edges of ring gear 122 are provided with a plurality of arc long slot bores 1221, and the corresponding end of bolt-through two valve bonnets 14 and the arc long slot bore 1221 of ring gear are fixedly connected with the three.Rotation valve rod 123, ring gear 122 is rotated in the scope of arc long slot bore 1221, drive simultaneously outer rotor 121 and rotate, when the first vacancy section 1111 on the second vacancy section 1121 on the valve block 112 and the sealed film 111 is corresponding, controlled communicating valve 10 unlatchings; When the second vacancy section 1121 was corresponding with the first seal area 1112, the second seal area 1122 was simultaneously corresponding with the first vacancy section 1111, and then controlled communicating valve 10 is closed.
In a specific embodiment, such as Fig. 4, shown in Figure 5, be equipped with four the first seal areas 1112 or the second seal area 1122 on sealed film 111 and the valve block 112, and four the first vacancy sections 1111 or the second vacancy section 1121.Circumference at ring gear 122 is evenly equipped with 6 less than the described arc long slot bore 1221 of 60 degree greater than 45 degree, ring gear 122 can rotate in 45 ° of scopes, its slewing area, can be by for example confirming in the angle sign of ring gear 122 and valve bonnet 14 settings, the scope that relatively rotates with control valve block 112 and sealed film 111 realizes that controlled communicating valve opens and closes accurately.
Adopt the experimental provision of the present invention of controlled communicating valve 10, can realize repeatedly connected sum closing function of valve, simple to operate.
Please cooperate referring to Figure 12, Figure 13, Figure 14, in another feasible technical scheme, communicating valve 1 is a communicating valve 20, and it is arranged in the core holding unit 5, comprises at least: elastic membrane 21, accommodating body 231, be arranged on the control gear 22 in the accommodating body.Wherein, has holding part 2310 in the accommodating body 231, described holding part 2310 at least one ends are openend, control gear 22 is arranged in this holding part 2310, elastic membrane 21 is arranged on an openend of accommodating body 231, can cover the end face of accommodating body 231 fully, and the cross section of accommodating body 231 is corresponding with the cross section of testing rock core 3, the other end of accommodating body 231 is resisted against another testing rock core 3.Control gear 22 is fixedly connected with elastic membrane 21, and can be with in the elastic membrane 21 income control gears 22.
One time communicating valve 20 further comprises: the openend at accommodating body 231 is provided with valve gap 232, elastic membrane 21 is arranged between valve gap 232 and the accommodating body 231, by bolt valve gap 232, elastic membrane 21 are fixedly connected with accommodating body 231, valve gap 232, accommodating body 231 consist of rock core post 23.
In a specific embodiment, as shown in figure 13, between elastic membrane 21 and valve gap 232, be provided with an orifice plate 24, this orifice plate 24 is connected to one valve gap 232, orifice plate 24 elastic membranes 21 by bolt with accommodating body 231.Wherein, this orifice plate 24 is an annular flake, and has a large internal diameter of trying one's best, by this orifice plate 24 is set, in elastic membrane 21 when pulled, can avoid breaking because of friction between elastic membrane 21 and the rock core post 23 (valve gap 232, accommodating body 231), make elastic membrane 21 be easy to intactly be pulled out, make a communicating valve 20 have maximum connection area.
In addition, elastic membrane 21 can be the film of being made by silicon rubber, has heatproof (conventional-60 ℃ to+250 ℃), resistance to oxidation, extensive chemical stability and the relatively poor characteristics of physical strength.Temperature range meets oil-gas component diffusion requirement of experiment, and extensive chemical stability guarantees that elastic membrane 21 is indeformable under the oil gas existence condition, and under the valve closing state, elastic membrane 21 can be blocked the both sides fluid contact effectively.The relatively poor physical disturbance that is conducive to elastic membrane 21 of physical strength can be convenient to the unlatching of valve.
The control gear 22 of a described connection valve comprises: piston cylinder 221, this piston cylinder 221 forms the guide part 222 that is built-in with guide channel 2221 near an end of elastic membrane 21, the connecting rod 224 that is connected with piston 223 is contained in the guide channel 2221, the end of connecting rod 224 is fixedly connected with elastic membrane 21, as shown in Figure 12 and Figure 13, in the present embodiment, be that the end of connecting rod 224 is fixedly connected with the middle part of elastic membrane 21.
Further, piston cylinder 221 is provided with the liquid injection pipe 225 that can be connected with external liquid supplying device near an end of guide part 222, and liquid injection pipe 225 can be connected with the power mouth 51 on the core holding unit 5.
In the specific embodiment, as shown in figure 14, guide part 222 forms bell guide 2222 towards an end of elastic membrane 21.
In addition, the above-mentioned accommodating body 231 interior ends that can form seal, and an end is the concave holding part 2310 of openend.For the ease of processing, described accommodating body 231 can also be the ducted body of a perforation, then this ducted body consists of described holding part 2310, control gear 22 sets within it, the two ends of accommodating body are equipped with a valve gap 232, described elastic membrane 21 is arranged on the openend of a side, and covers the whole end face of accommodating body 231.By bolt valve gap 232, elastic membrane 21, accommodating body 231 connected as a wholely, consist of a communicating valve of the present invention.
Adopt the experimental provision of the present invention of a communicating valve 20, have the large and little advantage of Iinvalid volume of the area of connection.
Please cooperate referring to Fig. 1, Fig. 2 and Figure 12, oil-gas component diffusion experimental technique in the pore media that the present invention proposes comprises:
A, utilize oil-gas component diffusion experimental provision in the above-mentioned pore media, be under the closed condition at communicating valve 1 (controlled communicating valve 10, a communicating valve 20), respectively the testing rock core 3 that is arranged on communicating valve 1 both sides is vacuumized;
Saturated fluid process in B, the testing rock core, in the testing rock core 3 that is arranged on communicating valve 1 one sides, be filled with the first fluid, be filled with the second liquid to the testing rock core 3 that is positioned at communicating valve 1 opposite side, and the pressure of accurate adjustment two side liquids, make temperature, the pressure of fluid of the testing rock core that enters communicating valve 1 both sides identical;
C, unlatching communicating valve 1 make fluid steadily contact under identical pressure state of communicating valve 1 both sides; For example, can be behind balance 10min, two side liquids are under the steady state (SS), open communicating valve 1;
Fluid sample in D, the timing extraction both sides testing rock core utilizes component analysis to calculate diffusion.Known technology is adopted in the abstracting method of this fluid sample and analytical calculation, does not repeat them here.
Wherein, at step C, should slowly open communicating valve 1, the fluid that makes communicating valve 1 both sides is Static Contact lentamente, and the speed of making great efforts to reduce because opening communicating valve 1 causes the component disturbance.
When arrange between two testing rock cores 3 be controlled communicating valve 10 time, saturated fluid process in the testing rock core of completing steps B, behind the fluid stable in the testing rock core 3, rotation valve rod 123 lentamente, make ring gear 122 rotate 45 ° along arc long slot bore 1221, drive simultaneously outer rotor 121 and rotate together 45 °, make the second vacancy section 1121 on the valve block 112 corresponding with the first vacancy section 1111 on the sealed film 111, the fluid in the testing rock core 3 that is arranged on controlled communicating valve 10 both sides can be in contact with one another.
Because controlled communicating valve 10 can be realized the repeatedly connected sum closing function of valve, therefore, when needs are organized the diffusion experiment to multiple fluid, can adopt this controlled communicating valve 10.After the diffusion experiment of finishing described the first fluid and the second fluid, rotation valve rod 123, drive 45 ° of outer rotor 121 backward rotation by ring gear 122, the sealing salient point 1113 that the first seal area 1112 arranges on the second vacancy section 1121 and the sealed film 111 on the valve block 112 is matched, and the second seal area 1122 on the valve block 112 matches with the first vacancy section 1111 on the sealed film 111, closes controlled communicating valve 10.Fluids in the controlled communicating valve 10 1 side test rock cores 3 are found time, this is stressed saturated fluid process in the testing rock core of multiple step B, be filled with the third fluid in testing rock core 3, the hydrodynamic pressure until the testing rock core of both sides in re-covers above-mentioned steps C, D after stablizing.In order to guarantee sealing property that controlled communicating valve 10 is good and stable functional reliability, common this valve is applicable to the test under the lower pressure condition, such as test pressure less than or equal to 5MPa.
If only need two kinds of fluids are tested, can adopt communicating valve 20 is set one time between two testing rock cores 3, saturated fluid process in the testing rock core of completing steps B then, behind the fluid stable in the testing rock core 3, by power mouth 51, liquid injection pipe 225 is to piston cylinder 221 interior injection fluids, pushing piston 223 moves to the direction away from elastic membrane 21, under the drive of connecting rod 224, elastic membrane 21 is drawn in the guide part 222 along bell guide 2222, then a communicating valve 20 is slowly opened, and the testing rock core 3 interior fluids of communicating valve 20 both sides are contacted mutually evenly.By liquid injection pipe 225 to the hydrodynamic pressure of piston cylinder 221 interior injections hour, elastic membrane 21 can be taken in the guide part 222 by integral body.When the pressure that injects was higher, elastic membrane 21 may be destroyed, but after destroying, elastic membrane 21 will be shrunk to less area, can guarantee flowing of two side liquids, equally also can reach the effect of valve opening, thereby the operation of this communicating valve 20 is reliable, and it is larger to be communicated with area.Usually the applicable pressure condition of a this communicating valve 20 is more extensive, and under stable, the identical condition of communicating valve both sides hydrodynamic pressure, test pressure can reach 40MPa.
The core holding unit 5 of this communicating valve 20 can adopt the core holding unit in routine equally, and the liquid injection pipe 225 that arranges on the described piston cylinder 221 can link to each other with one of them pressure tap of conventional core clamper, forms the power mouth 51 of a communicating valve 20.
When adopting experimental provision of the present invention to carry out in the pore media experiment of oil-gas component diffusion, controlled communicating valve 10 no matter be arranged between two testing rock cores 3, or communicating valve 20, Open valve lentamente, the fluid of rock core post both sides is slowly contacted, and namely the flow velocity of the fluid of both sides is slow as far as possible, and the valve opening process operation should be steady, make the both sides fluid contact become as far as possible Static Contact, make great efforts to reduce the disturbance that causes component because of Open valve speed.
Device and method of the present invention has been realized the timing of fluid in pore media, has been decided the state contact, realizes the measurement of static diffusion, and can and carry out the testing research that other fluid is got involved according to the design stopped reaction.
Further specify principle of the present invention below by two concrete examples:
(1) example 1
Carry out same experiment contrast, experiment content with conventional diffusion experimental technique: test under 60 ℃, 5MPa condition kerosene and CO
2Diffusion of components speed; At the both sides of communicating valve 1 filling silica sand, form the back-up sand physical model with pore texture, namely testing rock core 3, and the total length of this physical model (testing rock core 3) is 1m, diameter 50mm.Experimental implementation process such as aforementioned is at rock core 0.16m, 0.32m, 0.48m, 0.64m and the sample analysis CO of 0.8m place
2Content and oil sample component concentration, Figure 15 have been listed two kinds of CO that method is measured
2Content analysis result, icon 3-1,9-1 and 30-1 represent respectively and utilize communicating valve 20 method of testing the 3rd, 9 and 30 hour sample analysis result; Icon 3-2,9-2 and 30-2 represent respectively and utilize conventional method the 3rd, 9 and 30 hour sample analysis result.
The result shows: the measured value of conventional method all is higher than employing device and method of the present invention institute measured value, and both differences prolong in time and shorten gradually, illustrates that conventional method is at test CO
2During diffusion, CO
2There is small pressure reduction with the oil sample original pressure, has driving force to have unrealized static disperse state when causing both to contact.The pressure equilibrium that utilizes one time communicating valve 20 method of testings have then well realized two-phase, it is more accurate to measure numerical value.
(2) example 2
Carry out same experiment contrast, experiment content with conventional diffusion experimental technique: test under 60 ℃, 5MPa condition kerosene and CO
2Diffusion of components speed; At the both sides of communicating valve 1 filling sandstone, form the sandstone model with pore texture, namely testing rock core 3, and the total length of this physical model (testing rock core 3) is that 5cm, diameter are 25mm.1 measurement point is positioned at the rock core middle part.The experimental implementation process is summarized as follows:
1. the core holding unit both sides of conventional method after vacuumizing connect respectively the gentle sample of oil sample of isothermal and isobaric; Open simultaneously core holding unit both sides inlet valve, then oil gas simultaneously constant voltage enter in the rock core, close the both sides valve, stablize 10min; Regularly get gas sample Analysis for CO
2Content.
2. adopt controlled communicating valve 10 method of testings, the testing rock core 3 of controlled communicating valve 10 both sides is vacuumized, inject the gentle sample of oil sample of isothermal and isobaric; Slowly open controlled valve 10 after stablizing 10min; Regularly get gas sample Analysis for CO
2Content.
Figure 16 has listed the CO that above-mentioned two kinds of methods are measured
2Content analysis result, result show: the measured value initial stage of conventional method has than great fluctuation process, has shown that there is larger disturbance at the oil gas contact initial stage, and test value is higher, and the diffusion impact that is disturbed causes component concentration to increase, and contact condition is stable behind 30min.Utilize controlled communicating valve 10 method of testings then well to eliminate this disturbance, test curve is level and smooth, numerical value is lower than conventional method.
Adopt apparatus of the present invention and method, can realize that the static scattering nature under the pore media condition is measured; And can strictly control the diffusion of components initial time, accuracy of measurement improves; When adopting controlled communicating valve 10, can be in diffusion process stopped reaction, and can introduce other fluid.
The present invention adopts the valve control technology in the diffusion of components property detection in pore media, realized the connection of the testing rock core 3 of communicating valve 1 both sides and the control of separation.Experimental provision of the present invention, the communicating valve 1 that arranges in it has following characteristics: the one, it is large that this communicating valve 1 (controlled communicating valve 10, a communicating valve 20) is communicated with area; The 2nd, the little (Iinvalid volume: the containing fluid space that does not have the pore media characteristics in the valve) of the Iinvalid volume of this communicating valve 1.
As shown in Figure 1, area was large, passage short owing to be communicated with after communicating valve 1 of the present invention was opened, and fluid components is by behind the communicating valve, and its diffusion track can keep stable.Communicating valve 1 is under the prerequisite that realizes the control function, and it is minimum that the impact that makes diffusion be subject to the valve self structure reaches, and both sides testing rock core 3 presents overall permanence.Device and method of the present invention can make the disturbance of fluid components by communicating valve 1 time reach minimum.
The above only is the schematic embodiment of the present invention, is not to limit scope of the present invention.Any those skilled in the art, the equivalent variations of doing under the prerequisite that does not break away from design of the present invention and principle and modification all should belong to the scope of protection of the invention.And need to prove, each ingredient of the present invention is not limited in above-mentioned overall applicability, each technical characterictic of describing in the instructions of the present invention can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, other combination relevant with this case inventive point and concrete the application have been contained in the present invention in the nature of things.
Claims (25)
1. oil-gas component diffusion experimental provision in the pore media, it is characterized in that, described experimental provision comprises: a communicating valve, be clamped in the both sides that the interior testing rock core of core holding unit is arranged on described communicating valve, the connection area of described communicating valve is more than or equal to 1/2 of testing rock core cross-sectional area; Fluid can be injected into respectively the testing rock core that is positioned at described communicating valve both sides by described clamper, is positioned at connection or the separation of the testing rock core of its both sides by described communicating valve control.
2. oil gas diffusion experimental provision in the pore media as claimed in claim 1, it is characterized in that, described communicating valve comprises the switching valve that is arranged between the two described testing rock cores, can controls two described testing rock cores connections or separate, the control gear that is connected with described switching valve, and the rock core post that connects described communicating valve and testing rock core, described rock core post is made by the rock with pore media or metal, and its two ends are resisted against respectively described testing rock core.
3. oil gas diffusion experimental provision in the pore media as claimed in claim 2, it is characterized in that, described communicating valve is controlled communicating valve, comprise: two valve bonnets, be set in respectively on the two described rock core posts, described control gear can be arranged between the two described valve bonnets rotationally, is connected with described control gear by the end of bolt with two described valve bonnets, and the other end of two described valve bonnets can be connected with described core holding unit respectively.
4. oil gas diffusion experimental provision in the pore media as claimed in claim 3, it is characterized in that, described switching valve has sealed film, valve block, described valve block is arranged between described control gear and one of them valve bonnet, and be fixedly connected with described control gear, described sealed film and described valve block are oppositely arranged, and are positioned at the end of a described rock core post.
5. oil gas diffusion experimental provision in the pore media as claimed in claim 4, it is characterized in that, described controlled communicating valve also has a mandrel, described mandrel is arranged between the two described rock core posts, and be fixedly connected with at least one rock core post wherein, described sealed film, valve block are located at respectively on the described mandrel, and described control gear can rotate around described mandrel.
6. oil gas diffusion experimental provision in the pore media as claimed in claim 5 is characterized in that be provided with a compressing tablet between described control gear and another valve bonnet, described compressing tablet is set on the described mandrel.
7. such as oil gas diffusion experimental provision in each described pore media of claim 3 to 6, it is characterized in that, be provided with seal ring set between described rock core post and the valve bonnet, when by bolt two described valve bonnets being fastenedly connected, consisting of between described switching valve, control gear and valve bonnet, the rock core post and be tightly connected.
8. such as oil gas diffusion experimental provision in each described pore media of claim 4 to 6, it is characterized in that, described sealed film is provided with the first vacancy section and the first seal area, described valve block is provided with the second vacancy section and the second seal area, and the vacancy section and the seal area that arrange respectively on described sealed film and the valve block are mutually corresponding, realize the connection of described controlled communicating valve or close by described control gear.
9. such as oil gas diffusion experimental provision in each described pore media of claim 4 to 6, it is characterized in that described sealed film is provided with a plurality of the first fan-shaped vacancy sections and the first seal area, and described the first vacancy section and the setting of the first seal area interval; Described valve block be provided with described sealed film on the first vacancy section of arranging and the first seal area quantity equates, shape is identical the second vacancy section and the second seal area.
10. oil gas diffusion experimental provision in the pore media as claimed in claim 9, it is characterized in that, described the first seal area is provided with a plurality of spherical crown shape sealing salient points, described the second vacancy section forms a plurality of through holes, the sealing salient point that arranges on arrange position and described first seal area of the described through hole position of arranging is identical, and described sealing salient point can form with described through hole and be sealed and matched; Described the second seal area is the plane.
11. oil gas diffusion experimental provision in the pore media as claimed in claim 4 is characterized in that described sealed film is made by adding fluororubber, described valve block is made of metal.
12. oil gas diffusion experimental provision in the pore media as claimed in claim 3 is characterized in that described controlled communicating valve also has a mandrel, described mandrel is arranged between the two described rock core posts, and is fixedly connected with at least one rock core post wherein; Described control gear comprises: the gear set and the valve rod that are made of outer rotor and ring gear; And a rock core post pipe nipple is positioned at described control gear, and is set on the described mandrel; The outside of described ring gear is provided with described valve rod, and described outer rotor can be sheathed on the described rock core post pipe nipple by relatively described mandrel rotationally; Described valve block is fixedly connected with the end of described outer rotor.
13. oil gas diffusion experimental provision in the pore media as claimed in claim 12 is characterized in that described outer rotor forms the conical gear that is 45 ° of inclination angles with respect to axis, forms the internal tooth that matches with described outer rotor on the ring gear.
14. oil gas diffusion experimental provision in the pore media as claimed in claim 12, it is characterized in that, the outer peripheral edges of described ring gear are provided with a plurality of arc long slot bores, and the arc long slot bore of described bolt-through two described valve bonnets and described ring gear is fixedly connected with the three; And described ring gear can rotate in the scope of arc long slot bore under the drive of valve rod, drives simultaneously outer rotor and rotates, and when the second vacancy section on the valve block was corresponding with the first vacancy section on the described sealed film, described controlled communicating valve was opened; When described the second vacancy section was corresponding with described the first seal area, described controlled communicating valve was closed.
15. oil gas diffusion experimental provision in the pore media as claimed in claim 14 is characterized in that, is equipped with four the first seal areas or the second seal area on described sealed film and the valve block, and four the first vacancy sections or the second vacancy section; Circumference at described ring gear is evenly equipped with 6 less than the described arc long slot bore of 60 degree greater than 45 degree, and described ring gear can rotate in 45 ° of scopes.
16. oil gas diffusion experimental provision in the pore media as claimed in claim 1 or 2, it is characterized in that, described communicating valve is a communicating valve, it is arranged in the described core holding unit, at least comprise: elastic membrane, accommodating body, be arranged on the described control gear in the described accommodating body, has holding part in the described accommodating body, at least one end of described holding part is openend, described control gear is arranged in this holding part, described elastic membrane is arranged on an openend of described accommodating body, can cover the end face of described accommodating body, and the cross section of described accommodating body is corresponding with described testing rock core cross section, the other end of described accommodating body is resisted against another described testing rock core; Described control gear is fixedly connected with described elastic membrane, and described elastic membrane can be taken in the described control gear.
17. oil gas diffusion experimental provision in the pore media as claimed in claim 16, it is characterized in that, a described communicating valve further comprises: the openend of described accommodating body is provided with valve gap, described elastic membrane is arranged between valve gap and the accommodating body, by bolt described valve gap, elastic membrane are fixedly connected with described accommodating body, described valve gap, accommodating body consist of described rock core post.
18. oil gas diffusion experimental provision in the pore media as claimed in claim 16, it is characterized in that, described control gear comprises: piston cylinder, described piston cylinder forms the guide part that is built-in with guide channel near an end of described elastic membrane, the connecting rod that is connected with described piston is contained in the described guide channel, and its end is fixedly connected with described elastic membrane.
19. oil gas diffusion experimental provision in the pore media as claimed in claim 18, it is characterized in that, described piston cylinder is provided with the liquid injection pipe that can be connected with external liquid supplying device near an end of described guide part, and described liquid injection pipe is connected with power mouth on the described core holding unit.
20. oil gas diffusion experimental provision in the pore media as claimed in claim 18 is characterized in that, described guide part forms bell guide towards an end of described elastic membrane.
21. oil-gas component diffusion experimental technique in the pore media comprises:
A utilizes such as oil-gas component diffusion experimental provision in each described pore media of claim 1 to 20, is under the closed condition at described communicating valve, respectively the testing rock core that is arranged on the communicating valve both sides is vacuumized;
Saturated fluid process in B, the testing rock core, in the testing rock core that is arranged on described communicating valve one side, be filled with the first fluid, in the testing rock core of described communicating valve opposite side, be filled with the second liquid, and make the temperature of the fluid of the testing rock core that enters the communicating valve both sides, pressure identical;
C, open described communicating valve, make fluid steadily contact under identical pressure state of described communicating valve both sides;
Fluid sample in D, the timing extraction both sides testing rock core utilizes component analysis to calculate diffusion.
22. oil-gas component diffusion experimental technique in the pore media as claimed in claim 21 is characterized in that among the described step C, the fluid of described communicating valve both sides becomes Static Contact.
23. oil-gas component diffusion experimental technique in the pore media as claimed in claim 21, it is characterized in that, when arrange between the two described testing rock cores be controlled communicating valve the time, saturated fluid process in finishing the testing rock core of described step B, behind the fluid stable in the described testing rock core, rotation valve rod, drive outer rotor by ring gear and rotate 45 °, make the second vacancy section on the valve block corresponding with the first vacancy section on the sealed film, the fluid in the testing rock core that is arranged on described controlled communicating valve both sides is in contact with one another.
24. oil-gas component diffusion experimental technique in the pore media as claimed in claim 23, it is characterized in that, after finishing the diffusion experiment of described the first fluid and the second fluid, rotate described valve rod, drive 45 ° of outer rotor backward rotation by ring gear, the sealing salient point of the first seal area setting on the second vacancy section and the sealed film on the valve block is matched, close described controlled communicating valve, fluid in the described controlled communicating valve one side test rock core is found time, to saturated fluid process in the testing rock core of this side repeating said steps B, in described testing rock core, be filled with the third fluid, after hydrodynamic pressure in the testing rock core of both sides is stable, re-cover described step C, D.
25. oil-gas component diffusion experimental technique in the pore media as claimed in claim 21, it is characterized in that, when arrange between the two described testing rock cores be a communicating valve time, saturated fluid process in finishing the testing rock core of described step B, behind the fluid stable in the described testing rock core, in piston cylinder, inject fluid by power mouth, liquid injection pipe, promoting described piston moves to the direction away from elastic membrane, under the drive of connecting rod, elastic membrane is drawn in the guide part along bell guide, the interior fluid of testing rock core of described communicating valve both sides is in contact with one another.
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| CN113884421A (en) * | 2020-07-03 | 2022-01-04 | 中国石油化工股份有限公司 | Device and method for observing light hydrocarbon dissipated from rock core |
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