CN102798499B - Multi-tube type minimum mixed-phase pressure measuring method and device - Google Patents

Multi-tube type minimum mixed-phase pressure measuring method and device Download PDF

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Publication number
CN102798499B
CN102798499B CN201210289799.1A CN201210289799A CN102798499B CN 102798499 B CN102798499 B CN 102798499B CN 201210289799 A CN201210289799 A CN 201210289799A CN 102798499 B CN102798499 B CN 102798499B
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tubule
fluid
reciprocating pump
pressure
endpiece
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CN102798499A (en
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李实�
秦积舜
陈兴隆
俞宏伟
张可
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Petrochina Co Ltd
China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Abstract

The invention relates to a multi-tube type minimum mixed-phase pressure measuring method and device. The multi-tube type minimum mixed-phase pressure measuring device comprises multiple slim pipes connected in parallel, wherein each slim pipe is internally filled with quartz sands for simulating loose sandstone in a stratum; two ends of each slim tube are respectively connected with a fluid inlet and a fluid outlet; an injection pump is connected with the fluid inlet through a middle container; the fluid outlet is connected with a back-pressure valve; an inlet-end reciprocation pump is connected between the fluid inlet and the middle container; an outlet-end reciprocation pump is connected between the fluid outlet and the back-pressure valve; and two ends of each slim tube are provided with interface control valves capable of connecting or disconnecting each slim tube with both the fluid inlet and the fluid outlet. The multi-tube type minimum mixed-phase pressure measuring method, disclosed by the invention, enables gas and crude oil to flow in a reciprocation manner for multiple times in each slim tube by depending on a displacement force, so that the gas and the liquid can be mixed fully. Each slim tube can finish the test of one pressure point, and the measuring data of multiple pressure points can be obtained sequentially through multiple slim tubes, so that the accuracy of the data measurement is improved; and convenience for operation and short test period are obtained.

Description

The minimum miscible pressure measuring method of multitube and device
Technical field
The present invention relates to a kind ofly for measuring method and the device of minimum miscible pressure, the minimum miscible pressure measuring method of especially a kind of multitube and device, belong to oil physical property measuring technique.
Background technology
Minimum miscible pressure (MMP) is the most basic oil physical-property parameter in the gas drive development plan design of oil field.Studies confirm that in a large number, the raising oil recovery that the exploitation of gas drive under mixed phase state can be by a relatively large margin, thereby laboratory study determines that the minimum miscible pressure under reservoir condition is very important.
The method of the minimum miscible pressure of current known measurement mainly contains tubule experimental method and interfacial tension method, and wherein tubule experiment is the measuring method generally adopting in engineering application design.Wherein, as shown in Figure 1, experimental implementation be take displacement as main to known tubule measurement mechanism 1, by injection pump 12, the interior displacement gas pump of intermediate receptacle 11 is entered to tubule 10 entrances, the interior crude oil of tubule 10, by exporting through check valve 14 displacements out, is collected by graduated cylinder 13.Intermediate receptacle 11, the tubule 10 of this known configurations are all arranged in constant temperature oven.The effect of tubule 10 is in 20 meters of length, and gas composition relies on displacement power and diffusivity fully to mix with oil component, is being greater than under the condition of minimum miscible pressure, and gas and crude oil can be mixed into single-phase (being mixed phase).Between the loose sand grains in tubule 10, there is certain pore texture, mixed process is exerted an influence, can more real simulating oil deposit inner fluid seepage flow and the process such as component exchange.
Known tubule device is 6 millimeters of 20 meters long, diameter, and the steel tube of inner back-up sand, to simulate the pore texture of understressed sand.Displacing medium is made approximate piston type one dimension and is advanced, and can simulate the process of gaseous component and oil phase component mass transfer.Its standard of evaluating that gas phase and oil phase reach mixed phase state is the pressure of oil recovery while reaching 90%, and this standard draws on a large amount of oil fields sample actual measurement basis at home.Under this state, tubule is inconsistent along the mixability of gas phase in journey and oil phase in theory, part mixed phase not even, but the recovery ratio 90% of usining is not only applicable to engineering application as a criterion very much, and provide unified foundation for the research evaluation of different experiments chamber.
The key step that tubule experimental method is measured minimum miscible pressure is under reservoir temperature environment, recovery ratio when test has 6 different pressures of certain gap respectively, and recovery ratio is greater than 90% spot pressure and should be no less than 2 spot pressures conventionally.After test, according to 6 data fitting recovery ratio and pressure dependence curve, pressure corresponding to knee point place is the minimum miscible pressure of oil sample under this reservoir temperature.
The advantage of tubule experimental method is that measured value is applicable to engineering application very much, and studied personnel widely approve.Experimental principle is simple, determination methods is clear.But also there are following 3 shortcomings in the method:
Tubule have that diameter is little, distance and the feature such as back-up sand is loose, these factors also easily produce at displacement process that latch up phenomenon, particularly viscosity are high, heavy constituent (colloid, the pitch) crude oil that content is high simultaneously.
The tubule experiment measuring cycle long, every group of experiment takes cycle of the 1-2 month.Experimental procedure comprises: saturated oil, displacement and cleaning tubule (using respectively toluene, methyl alcohol, sherwood oil and nitrogen purge).
3. under high-temperature and high-pressure conditions, when experiment adopts corrosive gas, in longer cycle, often there is pipeline burn into Seepage, cause extend experimental period.
Because the defect 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 the minimum miscible pressure measuring method of multitube of the present invention and device, to shorten test period, and effectively improve measuring speed and the precision of minimum miscible pressure.
Summary of the invention
The object of this invention is to provide a kind of method of utilizing many short tubes to carry out minimum miscible pressure measurement.
Another object of the present invention is to provide the minimum miscible pressure measurement mechanism of a kind of multitube.
For this reason, the present invention proposes the minimum miscible pressure measuring method of a kind of multitube, comprising:
A, tubule are filled and presented, to insert in every tubule can simulated formation in the silica sand of understressed sand, by tubule two ends add filtering plug, pressure cap is fastening;
B, every tubule is carried out to saturated oil operation;
The inlet end of C, described tubule is connected with a reciprocating pump respectively with endpiece;
D, selection be a tubule wherein, carry out the gas drive experiment under the first pressure condition, gas and crude oil are back and forth flowed at least one times in single tubule, impact by described tubule inner pore structure, make two-phase reach sufficient mixing, and obtain the fluid that this root tubule is discharged under the first pressure condition, draw the recovery ratio of this root tubule under the first pressure condition;
E, select an other tubule, under another pressure condition, repeat above-mentioned steps D, obtain successively the recovery ratio under different pressures condition;
F, utilize the measured data of respectively organizing, matching pressure and recovery ratio relation curve, obtain minimum miscible pressure value according to knee point.
The present invention also proposes the minimum miscible pressure measurement mechanism of a kind of multitube, and it comprises:
Many tubules are connected in parallel, and are filled with the silica sand of understressed sand in simulated formation in every described tubule, and the two ends of described tubule are connected with fluid egress point with fluid intake respectively;
One injection pump is connected with described fluid intake by an intermediate receptacle, and described fluid egress point is connected with same pressure valve; Wherein, between described fluid intake and intermediate receptacle, be connected with an inlet end reciprocating pump, between described fluid egress point and check valve, be connected with endpiece reciprocating pump;
The two ends of every described tubule are provided with can control the interface operation valve that it is communicated with or closes with fluid intake and fluid egress point.
With known tubule comparison, the present invention has the following advantages:
1, the minimum miscible pressure measuring method of multitube and device have retained the measuring principle of known experimental technique, utilize the repeatedly to-and-fro movement in the hole in a tubule of fluid, realize fully contacting of gas and liquid, guaranteed the influence of pore texture to component mass transfer.Tubule length is reduced to 1-3 rice by 20 meters simultaneously, has effectively stopped because viscosity of crude is high, the high latch up phenomenon causing of heavy constituent content.
2, method of the present invention is short measuring period, and be 23 weeks every group of experimental period, and more known measuring method reduced about 3 weeks.Owing to significantly having shortened the length of tubule, so tubule cleaning process is more easy, and the cost of multitube tubule measurement mechanism is 1/3 of known configurations in addition, if experimental duties are nervous, can remove tubule cleaning process from, replaces new tubule.
3, because measuring period of the present invention is short, the corrosive gas that experiment adopts is very little on pipeline corrosion impact, has improved the success ratio of experiments of measuring.
4, the complexity of mixed phase between can the qualitative description different liquid phases of measuring method of the present invention.Gas-liquid after to-and-fro movement repeatedly, reaches even admixture in single tube, if now carry out the component analysis of gas phase or liquid phase, the component mass transfer degree between can clear and definite liquid phase, has reflected mixed phase degree.And known tubule method cannot be accomplished this point, can only describe by minimum miscible pressure.
The minimum miscible pressure measuring method of multitube that the present invention proposes is acted on principle and the testing process of pore texture on mixed process impact, rely on displacement power to make gas and crude oil in single tubule, (its number of times that back and forth flows is determined according to requirement of experiment) repeatedly back and forth flows, by the impact of pore texture, make gas-liquid two-phase reach well-mixed object.Every tubule can complete the test of a spot pressure, by many tubules, can obtain successively the measurement data of a plurality of spot pressures, can also carry out correct operation or additional survey by one or more tubule of extra increase, improve the accuracy of measurement data.The present invention is easy to operate, and test period is short.
Accompanying drawing explanation
The following drawings is only intended to the present invention to schematically illustrate and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is known minimum miscible pressure measurement mechanism structural representation;
Fig. 2 is the minimum miscible pressure measurement mechanism of multitube of the present invention structural representation;
Fig. 3 is that the tubule assembly master of the minimum miscible pressure measurement mechanism of multitube of the present invention looks schematic diagram;
Fig. 4 is the tubule assembly schematic side view of the minimum miscible pressure measurement mechanism of multitube of the present invention;
Fig. 5 is the end cap cross-sectional schematic of the minimum miscible pressure measurement mechanism of multitube of the present invention;
Fig. 6 is the diagrammatic cross-section along A-A line in Fig. 5.
Drawing reference numeral explanation:
1, known tubule measurement mechanism 10, tubule 11, intermediate receptacle
12, injection pump 13, graduated cylinder 14, check valve
2, measurement mechanism 20 of the present invention, tubule 201,202, end cap
203, interface operation valve 204, fluid intake 205, fluid egress point
206, tubule interface 207, connection runner 208, sprue
209, path 21, intermediate receptacle 22, injection pump
23, measuring container 24, check valve 25, constant temperature oven
26, inlet end reciprocating pump 27, endpiece reciprocating pump 28, side contiguous block
29,30, interface tube block 31, main contiguous block 32, rapid-acting coupling
Embodiment
The present invention proposes the minimum miscible pressure measuring method of a kind of multitube, and it mainly comprises:
A, tubule are filled and presented, to insert in every tubule can simulated formation in the silica sand of understressed sand, by tubule two ends add filtering plug, pressure cap is fastening;
B, every tubule is carried out to saturated oil operation;
The inlet end of C, described tubule is connected with a reciprocating pump respectively with endpiece;
D, selection be a tubule wherein, carry out the gas drive experiment under the first pressure condition, gas and crude oil are back and forth flowed at least one times in single tubule, impact by described tubule inner pore structure, make two-phase reach sufficient mixing, and obtain the fluid that this root tubule is discharged under the first pressure condition, draw the recovery ratio of this root tubule under the first pressure condition;
E, select an other tubule, under another pressure condition, repeat above-mentioned steps D, obtain successively the recovery ratio under different pressures condition;
F, utilize the measured data of respectively organizing, matching pressure and recovery ratio relation curve, obtain minimum miscible pressure value according to knee point.
Wherein, when every tubule is carried out to saturated oil operation, mainly comprise: open inlet end and the endpiece interface operation valve of tubule described in each, with the first pressure, in tubule described in each, pump into crude oil, and the check valve pressure setting being connected with the endpiece of described tubule is the first pressure; When displacement volume is greater than the twice of every tubule void volume sum, the interface operation valve that only retains tubule two ends is opened, and closes the interface operation valve at tubule two ends described in all the other; While continuing one times of single tubule volume of voids of displacement, the interface operation valve of closing these root tubule two ends; The interface operation valve of opening another root tubule two ends repeats above-mentioned steps, and each root tubule is carried out to displacement, until seven whole saturated oil of tubule complete, and closes the interface operation valve of every tubule.
Further, in gas drive experimentation: the valve of first opening the inlet end reciprocating pump that gas intermediate receptacle valve is connected with described tubule inlet end, through centre, hold and gas is pushed in tubule device, the endpiece reciprocating pump being connected with described tubule endpiece automatically moves back pump simultaneously under the first constant pressure state; When the gas volume in entering described tubule is 1.5 times of tubule void volume, closes intermediate receptacle and stop air feed; Then, start endpiece reciprocating pump, and with constant speed, the fluid in described endpiece reciprocating pump is oppositely pushed in described tubule, and described inlet end reciprocating pump is set as automatically moving back pump with the first constant pressure state; After endpiece reciprocating pump is all released pump inner fluid, be set as the first pressure state with constant moves back pump automatically, now inlet end reciprocating pump is set as constant speed state and starts; Repeat once above-mentioned startup endpiece reciprocating pump, inlet end reciprocating pump is set as automatically moving back pump; Close endpiece reciprocating pump, the endpiece of described tubule is communicated with the check valve that is connected to described tubule endpiece, and collect the fluid that described tubule endpiece is discharged.
For realizing the measuring method of above-mentioned minimum miscible pressure, the present invention also proposes the minimum miscible pressure measurement mechanism of a kind of multitube, it comprises: many tubules are connected in parallel, the silica sand that is filled with understressed sand in simulated formation in every described tubule, the two ends of described tubule are connected with fluid egress point with fluid intake respectively; One injection pump is connected with described fluid intake by an intermediate receptacle, and described fluid egress point is connected with check valve; Wherein, between described fluid intake and intermediate receptacle, be connected with an inlet end reciprocating pump, between described fluid egress point and check valve, be connected with endpiece reciprocating pump; The two ends of every described tubule are provided with can control the interface operation valve that it is communicated with or closes with liquid inlet and liquid outlet.
The present invention utilizes many tubules, and makes fluid to-and-fro movement in tubule, has replaced conventional tubule to test single long lines, mobile mode once, principle coincidence measurement of the present invention requirement, and test process is significantly simplified.And gas-liquid is in every tubule after to-and-fro movement repeatedly, reach even admixture, if now carry out the component analysis of gas phase or liquid phase, component mass transfer degree between can clear and definite liquid phase, by method of the present invention and device, not only can realize minimum miscible pressure and describe, but also can describe the complexity of mixed phase between liquid phase.
For technical characterictic of the present invention, object and effect being had more clearly, understand, below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, feature and effect to the minimum miscible pressure measuring method of multitube of the present invention and device, be described in detail as follows.In addition, by the explanation of embodiment, when can be to reach technological means and the effect that predetermined object takes more to be goed deep into concrete understanding to the present invention, however institute's accompanying drawing be only to provide with reference to and explanation use, be not used for the present invention to be limited.
As shown in Figure 2, measurement mechanism 2 of the present invention comprises: many tubules 20 are connected in parallel, and is filled with the silica sand of understressed sand in simulated formation in every tubule 20, and sand grains particle diameter and ratio are identical with known tubule method.Tubule 20 two ends add metal filtration plug, and this filtering plug can prevent that fine grained sand runs off.Tubule 20 two ends are fastening by cutting ferrule and pressure cap, and the filtering plug at tubule two ends is compressed, and make tubule, sand grains, filtering plug and pressure cap form one.The enclosed construction at these tubule 20 two ends can adopt conventional structure, does not repeat them here.Again the two ends of tubule 20 are connected with fluid egress point 205 with fluid intake 204 respectively; One injection pump 22 is connected with fluid intake 204 by an intermediate receptacle 21, and fluid egress point 205 is connected with check valve 24; Wherein, between fluid intake 204 and intermediate receptacle 21, be connected with an inlet end reciprocating pump 26, between fluid egress point 205 and check valve 24, be connected with endpiece reciprocating pump 27; The two ends of every tubule 20 are provided with can control the interface operation valve 203 that it is communicated with or closes with fluid intake 204 and fluid egress point 205.
Wherein, intermediate receptacle 21, inlet end reciprocating pump 26, endpiece reciprocating pump 27, tubule 20 are all arranged in constant temperature oven 25.
Check valve 24 is connected with measuring container 23, and measuring container 23 is also connected with endpiece reciprocating pump 27, thereby can accept the fluid of endpiece reciprocating pump 27 interior discharges.
In a preferred embodiment, the useful space in inlet end reciprocating pump 26 and endpiece reciprocating pump 27 is greater than 1.5 times of every tubule void volume.And the length of every tubule is 1m 3m.
The present invention adopts the many tubules short compared with known technology, can complete successively the test process of different pressures point, has greatly shortened measuring period, and tubule cleaning process is more easy, and has saved tubule scavenging period.
Please refer to Fig. 3, Fig. 4, in a feasible technical scheme, the two ends of tubule 20 are connected with end cap 201,202 respectively, end cap 201,202 is provided with a plurality of tubule interfaces 206 in mating connection with tubule 20, one of them end cap 201 is provided with the fluid intake 204 being connected with injection pump 22, another end cap 202 is provided with the fluid egress point 205 being connected with check valve 24, and tubule interface 206 can be connected with fluid intake 204 or fluid egress point 205 by the path 209 being arranged in end cap.
Further, end cap 201,202 is provided with two row's tubule interfaces 206, between a plurality of tubule interfaces 206 of every row, by the connection runner 207 being arranged in end cap, be connected, between two row's tubule interfaces 206 of end cap 201, be provided with fluid intake 204, between two row's tubule interfaces 206 of end cap 202, be provided with fluid egress point 205, fluid intake 204 or fluid egress point 205 are connected with each tubule interface 206 by sprue 208 and connection runner 207, and the connection runner 207 in end cap 201,202 forms I-shaped path 209 with sprue 208.Certainly, the setting position of tubule interface 206, fluid intake 204, fluid egress point 205 is not limited to this, wherein, fluid intake 204, fluid egress point 205 also can be arranged on the outside of two row's tubule interfaces, as long as can control every tubule 20 by interface operation valve 203, be communicated with or close just passable with fluid intake 204 and fluid egress point 205.
In addition, the planform of end cap 201,202 with and the shape of interior path 209 be not limited, end cap 201,202 can cover at two the two parts that form described path 209 on face for being fastened and formed by two halfbodies, the fluid passage of complete after fastening.For the ease of processing, end cap 201,202 also may be spliced to form by a plurality of blocks, please refer to Fig. 4, Fig. 5, Fig. 6, in a specific embodiment, end cap 201,202 comprises the main contiguous block 31 of two interface tube blocks 29,30,, wherein, interface tube block 29,30 is provided with the more than one tubule interface 206 that can be connected with tubule 20, between each tubule interface 206, by being communicated with runner 207, is connected; One side of the main contiguous block 31 of end cap 201 is provided with fluid intake 205, and a side of the main contiguous block 31 of end cap 202 is provided with fluid egress point 205, and fluid intake 204 or fluid egress point 205 are connected with the sprue 208 that connects described main contiguous block 31; The two ends of main contiguous block 31 are connected with interface tube block 29,30 respectively, the two ends of this sprue 208 are connected with the connection runner 207 of interface tube block 29,30 respectively, form I-shaped path 209, and the two ends of main contiguous block 31 and with interface tube block 29,30 for being tightly connected, be communicated with between runner 207 and sprue 208 for being tightly connected, guarantee that in it, mobile fluid can not leak.Wherein, in Fig. 5, Fig. 6, schematically shown the connection situation of end cap inner gateway 209.
In addition, the two ends of two rectangular tube interface body 29,30 are bolted to connection with a side contiguous block 28 respectively, the entire terminal cover 201,202 that form Stability Analysis of Structures, is connected firmly.
Below in conjunction with device of the present invention, illustrate the measuring method of the minimum miscible pressure of multitube.
First carry out filling and presenting of tubule 20, to insert in every tubule 20 can simulated formation in the silica sand of understressed sand, by tubule two ends add filtering plug, pressure cap is fastening; Then, the two ends of every tubule 20 are connected with the tubule interface 206 arranging on end cap 201 and end cap 202 respectively, injection pump 22 is connected with the entrance of tubule 20 by intermediate receptacle 21, and the endpiece of tubule 20 is parallel with check valve 14, starts every tubule to carry out saturated oil operation; After the every whole saturated oil of tubule 20 complete, the interface operation valve 203 of closing all tubules two ends, is connected with inlet end reciprocating pump 26 inlet end of tubule 20 respectively with endpiece, and disconnects check valve 14 with endpiece reciprocating pump 27; Select a wherein tubule 20, carry out the gas drive experiment under the first pressure condition, gas and crude oil are back and forth flowed at least one times in single tubule, impact by described tubule inner pore structure, make gas-liquid two-phase reach sufficient mixing, and obtain the fluid that this root tubule is discharged under the first pressure condition, draw the recovery ratio of this root tubule under the first pressure condition; Select an other tubule, under another pressure condition, repeat above-mentioned gas drive experimental procedure, recovery ratio while obtaining 6 different pressures as hope, needs 6 tubules under 6 pressure, to carry out respectively above-mentioned gas drive experiment, obtains successively the recovery ratio under different pressures condition; Finally, utilize the measured data of respectively organizing, matching pressure and recovery ratio relation curve, obtain minimum miscible pressure value according to knee point, and this step is known technology, does not repeat them here.
In a specific embodiment, above-mentioned saturated job step further comprises:
The inlet end of b1, each tubule 20 and endpiece interface operation valve 203 are all opened, and injection pump pumps into crude oil with the first pressure P 1 in each tubule 20, and the check valve pressure setting that the endpiece with tubule 20 is connected is the first pressure P 1;
B2, when displacement volume is greater than the twice of every tubule 20 void volume sums, the interface operation valve 203 that only retains tubule two ends is opened, the interface operation valve 203 of closing all the other tubule 20 two ends;
When b3, one times of single tubule volume of voids of continuation displacement, the interface operation valve 203 of closing these root tubule 20 two ends;
B4, the interface operation valve 203 of opening another root tubule 20 two ends repeat above-mentioned steps b3, and each root tubule is carried out to displacement one by one, until the every whole saturated oil of tubule complete, and close the interface operation valve 203 of every tubule 20.
Further, above-mentioned miscible pressure gas drive experiment comprises:
1) open the valve of gas intermediate receptacle 21 valves and the inlet end reciprocating pump 26 being connected with tubule 20 inlet ends, injection pump, intermediate receptacle 21, inlet end reciprocating pump 26, a selected tubule 20, endpiece reciprocating pump are connected, through centre, hold 21 and gas is pushed in tubule device, the endpiece reciprocating pump 27 being connected with tubule 20 endpiece automatically moves back pump simultaneously under the first constant pressure state;
2), when the gas volume in entering this root tubule 20 is for 1.5 times of this tubule void volume, closes intermediate receptacle 21 and stop air feed;
3) start endpiece reciprocating pump 27, and with constant speed, the fluid in endpiece reciprocating pump 27 is oppositely pushed in this tubule 20, and 26, inlet end reciprocating pump is set as automatically moving back pump with the first constant pressure state;
4) after endpiece reciprocating pump 27 is all released pump inner fluid, be set as the first pressure state with constant moves back pump automatically, now 26, inlet end reciprocating pump is set as constant speed state and starts;
5) after inlet end reciprocating pump 26 is all released the fluid in it, repeating step 3) once;
6) close endpiece reciprocating pump 27, the endpiece of this tubule 20 is communicated with the check valve 14 that is connected to tubule endpiece, inlet end reciprocating pump 26 is set as to constant speed state and starts, collect the fluid of being discharged by this tubule.
Wherein, in above-mentioned steps 6), when inlet end reciprocating pump 26 cuts out after pump inner fluid all flows out, continuation is to the gas of 1.5 times of volume of voids of the interior injection of this tubule 20, fluid in this tubule 20 can fully be discharged, the fluid of its discharge also counts in the lump this tubule of collecting and discharges in the total amount of fluid, thereby can guarantee that the recovery ratio of this measured root tubule is accurate.So far, the experiment of the gas drive under pressure P 1 state finishes.When gas drive experiment is opened, four plungers of inlet end reciprocating pump 26 and endpiece reciprocating pump 27 are the top in pump all, before pump inner plunger, there is no fluid.
For make measurement data accurately, reliable, in a preferred embodiment, the radical of tubule 20 is set to than the spot pressure of required measurement many at least one.Thereby in measuring process, if when one of them spot pressure measurement result is produced to query, can utilize the tubule of increase to mend survey.
To adopt seven tubules to carry out minimum miscible pressure, be measured as specific embodiment below, further illustrate principle of work of the present invention.
In the present embodiment, have seven tubules 20, adopt stainless steel to make, can select internal diameter 6mm, wall thickness imm, withstand voltage iOOMPa, 200 ℃ of heatproofs, the tubule 20 of joint length 1m.At every tubule 20 inner filling silica sands, sand grains particle diameter and ratio are identical with conventional tubule method.The two ends of tubule 20 add the metal filtration plug of external diameter 6mm, length 1Omm.Filtering plug permeability is greater than 10 darcies, and end face aperture is less than 10 microns, prevents that fine grained sand runs off.Tubule two ends outer wall is fastening by internal diameter 8mm cutting ferrule and pressure cap, can not only be connected with the tubule interface on end cap, and the cutting ferrule of impaction state is also by the filtering plug compression at tubule two ends, makes tubule, sand grains, filtering plug and pressure cap form one.Measuring minimum miscible pressure with known tubule experimental method compares, tubule 20 of the present invention has reduced the length of tubule greatly, in known method, the length of tubule is 20m, and tubule 20 of the present invention is generally 1m-3m, therefore, compare with known technology, the present invention has shortened measuring period greatly, has improved measuring speed and the measuring accuracy of minimum miscible pressure.
Please refer to Fig. 5, in the present embodiment, the connected mode of tubule 20 employing rapid-acting couplings 32, is connected the two ends of every tubule 20 with end cap 201,202, thereby has improved the built-up time of measurement mechanism, has further improved operating efficiency.
As shown in Figure 4, by two end caps 201,202, seven tubules 20 are together in parallel, and end cap 201,202 is connected with injection pump 22, intermediate receptacle 21, inlet end reciprocating pump 26 and endpiece reciprocating pump 27, check valve 24, measuring container 23 of carrying out displacement test etc. respectively.The present invention is respectively equipped with seven tubule interfaces 206 on end cap 201,202, as shown in the figure, in the present embodiment, end cap 201,202 integral body are that two interface tube blocks 29,30, side contiguous block 28 and the main contiguous block 31 of rectangle forms, an interface tube block 29 is provided with four tubule interfaces 206 therein, another interface tube block 30 is provided with between 206, two interface tube blocks of three tubule interfaces 29,30 and is connected by main contiguous block 31, and both sides are connected by side contiguous block 28.Interface tube block the 29, the 30th, the bearing object being connected with tubule 20, and also they have path 209 to be connected with 31 of main contiguous blocks, at upper and lower end face, by interface operation valve 203, control the path 209 that single tubule 20 is connected with main contiguous block 31.Contiguous block 28 fitted bolts in side use, and play effect fastening, that stablize whole multitube tubule device.
Graduated cylinder 13 in the present invention is not only connected with check valve 14, is also connected with endpiece reciprocating pump 27 simultaneously, can accept the fluid of discharging when endpiece reciprocating pump 27 is emptying.Because fluid has to a certain degree residual after mixing in endpiece reciprocating pump 27, while particularly changing oil sample, must guarantee endpiece reciprocating pump 27 is emptying, guaranteeing does not have other fluid in it.
Carry out the measurement of minimum miscible pressure, first carry out Preparatory work of experiment, fill and present tubule 20, according to the strata condition of required simulation, after the silica sand choosing is mixed, pack in every tubule 20, at tubule 20 two ends, add filtering plug, and fastening with cutting ferrule, pressure cap.Oil gas preparation of samples, prepares saturated with crude oil and displacement gas.Experimental design, determines the parameters such as experimental temperature, spot pressure P1~P6 to be tested (from low to high) and displacing velocity.
Then be saturated oil process, under definite experimental temperature, according to experimental standard saturated oil, every tubule 20 is connected in parallel with check valve 14 by the fluid egress point 205 of end cap 202, in this process, cut off inlet end reciprocating pump 26 and endpiece reciprocating pump 27 and being connected of installing.The back pressure of check valve is set to the first force value (P1), and injection pump 12 pushes multitube tubule device by the crude oil in intermediate receptacle 11, under pressure P 1 condition, with 0.05mL/min flow velocity, carries out saturated.Control that every tubule 20 two ends are communicated with fluid intake 204, the fluid egress point 205 of end cap 201,202 or the interface operation valve 203 that disconnects is all opened at saturated initial stage; When displacement volume is greater than 2 times of 7 tubule 20 interior total pore size volumes, adjust and control the interface operation valve 203 that tubule 20 is communicated with or disconnects with endpiece end cap 202, the interface operation valve 203 that only retains a tubule 20 is opened, and closes being communicated with of all the other six roots of sensation tubules 20 and end cap 202 inner gateways 209; While continuing one times of single tubule volume of voids of displacement, close the interface operation valve 203 of this root tubule and end cap 202 links, select an other tubule,, open the interface operation valve 203 of another root tubule 20, this tubule is carried out to one times of single tubule volume of voids of displacement, repeat this step, until after seven whole saturated oil of tubule 20 complete, close total interface operation valve 203.Recovery inlet end reciprocating pump 26 and endpiece reciprocating pump 27 are communicated with apparatus of the present invention, disconnect check valve 14 paths.
Carry out gas drive experiment, obtain the recovery ratio under each pressure condition.Select No. 1 tubule 20 to carry out the gas drive experiment under the first pressure (P1) condition, that is, only No. 1 tubule is connected with the sprue of main contiguous block 31, and all the other interface operation valves 203 are all in closed condition.4 plungers of inlet end reciprocating pump 26 and endpiece reciprocating pump 27 are the top in pump all, in pump, there is no fluid.A. open the valve of gas intermediate receptacle 11 and the valve of inlet end reciprocating pump 26, injection pump 12 pushes gas in tubule device with the speed of 0.01mL/min, and endpiece reciprocating pump 27 moves back pump automatically at P1 pressure constant state simultaneously; B. when the gas of 1.5 times of volume of voids (PV) enters tubule 20, disconnect intermediate receptacle 11; C. endpiece reciprocating pump 27 is arranged and changes to the constant speed state of 0.01mL/min speed and start, 26, inlet end reciprocating pump is set as P1 pressure constant state and automatically moves back pump; D. after endpiece reciprocating pump 27 is all released pump inner fluid, be set as P1 pressure constant state moves back pump automatically, now 26 constant speed states that are set as 0.01mL/min speed of inlet end reciprocating pump; E. repeating step c once; F. close endpiece reciprocating pump 27, the fluid egress point of end cap 202 is connected with check valve 14, inlet end reciprocating pump 26 is set as the constant speed state of 0.01mL/min speed and starts, and collects produced fluid.Inlet end reciprocating pump 26 cuts out after pump inner fluid all flows out; Continue to open injection pump 12 and gas intermediate receptacle 11, with the speed of 0.01mL/min, inject 1.5PV gas, guarantee the abundant output of fluid (oil phase) quilt in single tubule, experiment finishes.Calculate the recovery ratio η 1 under P1 pressure.
In above-mentioned saturated oil step and gas drive experimentation, by the measurement under different pressures condition to every tubule, can obtain successively the recovery ratio η 1~η 6 under second to the 6th (P2~P6) pressure; When a certain pressure test effect is produced to query, can utilize No. seven pipes to mend survey.
Determine minimum miscible pressure.Utilize the 6 groups of data of surveying, matching pressure and recovery ratio relation curve, obtain minimum miscible pressure according to knee point.This step is identical with known method, does not repeat them here.
At above-mentioned experimentation, the flow velocity of each stage fluid is not limited to 0.01mL/min, and its concrete speed requires design according to actual experiment and determines, for example, can within the scope of 0.005~5mL/min, change.
Seven tubular type tubule measuring methods and conventional tubule method are carried out same experiment contrast, and comparing result is in Table 1.
The comparing result of two kinds of method of testings of table 1
Known by above contrast:
Multitube tubule measuring method of the present invention guarantees smooth and easy the carrying out of individual event pressure test, and conventional tubule experimental technique easily stops up, and causes to remeasure, extend experimental period.Measuring method of the present invention has realized concentrated saturated oil step, has avoided the step that will clean tubule before each measurement in conventional method.Measuring method of the present invention is the complexity of mixed phase between can the qualitative description different liquid phases of the reciprocal time in tubule by fluid-mixing, data in table 1 show, it is lower that multitube tubule measuring method records result, proves that the exchange of the component between gas phase and oil phase is more abundant in tubule.
The foregoing is only the schematic embodiment of the present invention, not in order to limit scope of the present invention.Any those skilled in the art, not departing from equivalent variations and the modification of doing under the prerequisite of design of the present invention and principle, all should belong to the scope of protection of the invention.And it should be noted that, each ingredient of the present invention is not limited in above-mentioned overall applicability, each technical characterictic of describing in 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 specifically application have been contained in the present invention in the nature of things.

Claims (19)

1. the minimum miscible pressure measuring method of multitube, comprising:
A, tubule are filled and presented, to insert in every tubule can simulated formation in the silica sand of understressed sand, by tubule two ends add filtering plug, pressure cap is fastening;
B, every tubule is carried out to saturated oil operation;
The inlet end of C, described tubule is connected with a reciprocating pump respectively with endpiece;
D, selection be a tubule wherein, carry out the gas drive experiment under the first pressure condition, gas and crude oil are back and forth flowed at least one times in single tubule, impact by described tubule inner pore structure, make gas and crude oil two-phase reach sufficient mixing, and obtain the fluid that this root tubule is discharged under the first pressure condition, draw the recovery ratio of this root tubule under the first pressure condition;
E, select an other tubule, under another pressure condition, repeat above-mentioned steps D, obtain successively the recovery ratio under different pressures condition;
F, utilize the measured data of respectively organizing, matching pressure and recovery ratio relation curve, obtain minimum miscible pressure value according to knee point.
2. the minimum miscible pressure measuring method of multitube as claimed in claim 1, is characterized in that, above-mentioned steps B further comprises:
B1, open inlet end and the endpiece interface operation valve of tubule described in each, with the first pressure, in tubule described in each, pump into crude oil, and the check valve pressure setting being connected with the endpiece of described tubule is the first pressure;
B2, when displacement volume is greater than the twice of every tubule void volume sum, the interface operation valve that only retains tubule two ends is opened, and closes the interface operation valve at tubule two ends described in all the other;
When b3, one times of single tubule volume of voids of continuation displacement, the interface operation valve of closing these root tubule two ends;
B4, the interface operation valve of opening another root tubule two ends repeat above-mentioned steps b3, and each root tubule is carried out to displacement, until the every whole saturated oil of tubule complete, and close the interface operation valve of every tubule.
3. the minimum miscible pressure measuring method of multitube as claimed in claim 1, is characterized in that, above-mentioned steps D further comprises:
1) valve of the inlet end reciprocating pump that unlatching gas intermediate receptacle valve is connected with described tubule inlet end, through intermediate receptacle, gas is pushed in tubule device, the endpiece reciprocating pump being connected with described tubule endpiece automatically moves back pump simultaneously under the first constant pressure state;
2), when the gas volume in entering described tubule is 1.5 times of tubule void volume, closes intermediate receptacle and stop air feed;
3) start endpiece reciprocating pump, and with constant speed, the fluid in described endpiece reciprocating pump is oppositely pushed in described tubule, and described inlet end reciprocating pump is set as automatically moving back pump with the first constant pressure state;
4) after endpiece reciprocating pump is all released pump inner fluid, be set as the first pressure state with constant moves back pump automatically, now inlet end reciprocating pump is set as constant speed state and starts;
5) repeating step 3) once;
6) close endpiece reciprocating pump, the endpiece of described tubule is communicated with the check valve that is connected to described tubule endpiece, inlet end reciprocating pump is set as constant speed state and starts, and collects the fluid that described tubule endpiece is discharged.
4. the minimum miscible pressure measuring method of multitube as claimed in claim 3, it is characterized in that, described step 6) further comprise, described inlet end reciprocating pump cuts out after pump inner fluid all flows out, continuation is to the gas that injects 1.5 times of volume of voids in described tubule, fluid in described tubule can fully be discharged, guarantee that the recovery ratio of every measured described tubule is accurate.
5. the minimum miscible pressure measuring method of multitube as claimed in claim 1, is characterized in that, the quantity of described tubule is than the spot pressure of required measurement many at least one.
6. the minimum miscible pressure measuring method of multitube as claimed in claim 5, is characterized in that, in measuring process, when one of them spot pressure measurement result is produced to query, utilizes the tubule increasing to mend survey.
7. the minimum miscible pressure measuring method of the multitube as described in claim 1 to 6 any one, is characterized in that, the length of described tubule is 1m-3m.
8. the minimum miscible pressure measuring method of the multitube as described in claim 1 to 6 any one, it is characterized in that, when the gas drive experiment of carrying out above-mentioned steps D, four plungers of described inlet end reciprocating pump and endpiece reciprocating pump are the top in pump all, before pump inner plunger, there is no fluid.
9. the minimum miscible pressure measuring method of multitube as claimed in claim 8, is characterized in that, the useful space in described inlet end reciprocating pump and endpiece reciprocating pump is greater than 1.5 times of every tubule void volume.
10. the minimum miscible pressure measurement mechanism of multitube, is characterized in that, the minimum miscible pressure measurement mechanism of described multitube comprises:
Many tubules are connected in parallel, and are filled with the silica sand of understressed sand in simulated formation in every described tubule, and the two ends of described tubule are connected with fluid egress point with fluid intake respectively;
One injection pump is connected with described fluid intake by an intermediate receptacle, and described fluid egress point is connected with check valve; Wherein, between described fluid intake and intermediate receptacle, be connected with an inlet end reciprocating pump, between described fluid egress point and check valve, be connected with endpiece reciprocating pump;
The two ends of every described tubule are provided with can control the interface operation valve that it is communicated with or closes with fluid intake and fluid egress point.
The minimum miscible pressure measurement mechanism of 11. multitube as claimed in claim 10, it is characterized in that, the two ends of described tubule are connected with end cap respectively, and described end cap is provided with a plurality of and described tubule tubule interface in mating connection, and fluid intake or fluid egress point; Described tubule interface can be connected with described fluid intake or fluid egress point.
The minimum miscible pressure measurement mechanism of 12. multitube as claimed in claim 11, it is characterized in that, described end cap is provided with the described tubule interface of two rows, between every row's a plurality of described tubule interface, by the connection runner being arranged in described end cap, be connected, between the described tubule interface of described two row, be provided with described fluid intake or fluid egress point, described fluid intake or fluid egress point are connected with tubule interface described in each by sprue and connection runner, and described connection runner and sprue in described end cap form I-shaped path.
The minimum miscible pressure measurement mechanism of 13. multitube as claimed in claim 11, it is characterized in that, described end cap comprises two interface tube blocks, a main contiguous block, wherein, described interface tube block is provided with the more than one tubule interface that can be connected with described tubule, between each tubule interface, by being communicated with runner, is connected; One side of described main contiguous block is provided with fluid intake or fluid egress point, and described fluid intake or fluid egress point are connected with the sprue of the described main contiguous block of perforation; The two ends of described main contiguous block are connected with interface tube block respectively, and the two ends of described sprue are connected with the connection runner of described interface tube block respectively, form I-shaped path.
The minimum miscible pressure measurement mechanism of 14. multitube as claimed in claim 13, is characterized in that, described two interface tube body two ends are fixedly connected with a side contiguous block respectively, form described end cap.
The minimum miscible pressure measurement mechanism of 15. multitube as claimed in claim 10, is characterized in that, described intermediate receptacle, inlet end reciprocating pump, endpiece reciprocating pump, tubule are all arranged in constant temperature oven.
The minimum miscible pressure measurement mechanism of 16. multitube as claimed in claim 10, is characterized in that, described check valve is connected with measuring container, and measuring container is connected with endpiece reciprocating pump, can accept the fluid of discharging in endpiece reciprocating pump.
The minimum miscible pressure measurement mechanisms of 17. multitubes as claimed in claim 10, is characterized in that, the quantity of described tubule is than the spot pressure of required measurement many at least one.
The minimum miscible pressure measurement mechanism of 18. multitube as claimed in claim 10, is characterized in that, the length of described tubule is 1m-3m.
The minimum miscible pressure measurement mechanism of 19. multitube as claimed in claim 10, is characterized in that, the useful space in described inlet end reciprocating pump and endpiece reciprocating pump is greater than 1.5 times of every tubule void volume.
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