CN210714658U - Pressure reduction device and experimental equipment for simulating foam oil exhaustion exploitation - Google Patents
Pressure reduction device and experimental equipment for simulating foam oil exhaustion exploitation Download PDFInfo
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- CN210714658U CN210714658U CN201921211277.3U CN201921211277U CN210714658U CN 210714658 U CN210714658 U CN 210714658U CN 201921211277 U CN201921211277 U CN 201921211277U CN 210714658 U CN210714658 U CN 210714658U
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- 230000009467 reduction Effects 0.000 title claims abstract description 20
- 239000006260 foam Substances 0.000 title claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000007789 gas Substances 0.000 claims abstract description 98
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 58
- 239000004576 sand Substances 0.000 claims abstract description 53
- 239000003921 oil Substances 0.000 claims abstract description 36
- 239000010779 crude oil Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 239000008400 supply water Substances 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 12
- 238000002474 experimental method Methods 0.000 abstract description 12
- 238000004088 simulation Methods 0.000 abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 33
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010943 off-gassing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The utility model provides an experimental facilities of pressure reduction means and simulation foam oil exhaustion exploitation, this pressure reduction means includes: the nitrogen gas source is provided with a gas supply port and a gas exhaust port, and the gas supply port is used for connecting the sand filling pipe; and the gas mass flow controller is connected with the exhaust port and can control the flow of the gas passing through the exhaust port so as to control the pressure drop speed of the nitrogen gas source. Through the utility model discloses, alleviated the experiment of simulation foam oil exhaustion exploitation among the prior art, pressure drop speed is dynamic change, causes the output crude oil of sand pack pipe easily and flows unstably, influences the technical problem of the accuracy nature of experiment.
Description
Technical Field
The utility model relates to an oil gas exploitation engineering technical field especially relates to an experimental facilities of pressure reduction means and simulation foam oil exhaustion exploitation.
Background
Currently, a sand pack pipe is commonly used in laboratories to perform simulation experiments for oil and gas production. When simulating the foam oil exhaustion exploitation experiment, the sand filling pipe needs to be pressurized to the original oil reservoir pressure at first, and then the pressure at the outlet of the sand filling pipe is gradually reduced so as to simulate the foam oil exhaustion exploitation under different operating conditions. In the operation process, the outlet of the sand filling pipe is connected with the nitrogen tank, the pressure in the nitrogen tank is consistent with the pressure of the outlet of the sand filling pipe, and the pressure of the outlet of the sand filling pipe is reduced by reducing the pressure in the nitrogen tank. The air pressure in the nitrogen tank can be reduced by deflating the nitrogen tank. The pressure in the nitrogen tank is higher, part of nitrogen exists in the form of nitrogen gas, and part of nitrogen exists in the form of liquid nitrogen, and when gas is released, part of liquid nitrogen is vaporized into nitrogen gas. The inventors have found that if the gas is bled at a constant rate, the pressure in the nitrogen tank does not decrease at a constant rate, and the pressure drop rate is dynamically varied throughout the bleed process, making it difficult to simulate the actual process of foam oil depletion production.
In the prior art, a gradual air release operation mode is adopted, namely, the nitrogen tank is subjected to primary air release operation, and when the air pressure in the nitrogen tank is reduced to a pressure value, an air release switch is closed to stop air release; after a period of time, turning on the air release switch to perform next air release operation, and turning off the air release switch to stop air release when the air pressure in the nitrogen tank is reduced to another pressure value; by doing so many times, the process of the pressure in the sand pack decreasing with the exploitation from the original reservoir pressure is simulated. The pressure reduction mode is stepped pressure reduction, which easily causes unstable flow of produced crude oil of the sand filling pipe and influences the accuracy of failure exploitation experiments.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pressure reduction means and experimental facilities of simulation foam oil exhaustion exploitation to alleviate the experiment of simulation foam oil exhaustion exploitation among the prior art, the pressure reduction speed is dynamic change, arouses the production crude oil of sand pack pipe easily to flow unstably, influences the technical problem of the accuracy nature of experiment.
The above object of the present invention can be achieved by the following technical solutions:
the utility model provides a pressure reduction device, include: the nitrogen gas source is provided with a gas supply port and a gas exhaust port, and the gas supply port is used for connecting the sand filling pipe; and the gas mass flow controller is connected with the exhaust port and can control the flow of the gas passing through the exhaust port so as to control the pressure drop speed of the nitrogen gas source.
In a preferred embodiment, the pressure reducing device comprises: and the control device is connected with the gas mass flow controller and is used for setting a flow set value of the gas mass flow controller.
In a preferred embodiment, the pressure reducing device comprises: the gas mass flow controller is provided with a flow detection module, and the flow detection module is in signal connection with the control device.
In a preferred embodiment, the pressure reducing device comprises: the pressure reduction device comprises a barometer arranged on the nitrogen gas source, and the barometer is in signal connection with the control device.
In a preferred embodiment, a filter is provided between the nitrogen gas source and the gas mass flow controller.
In a preferred embodiment, a switch valve is arranged between the nitrogen gas source and the gas mass flow controller.
The utility model provides an experimental facilities of simulation foam oil exhaustion exploitation, include: a sand filling pipe, a gas-liquid separator and the pressure reducing device; and the gas supply port of the nitrogen gas source and the inlet of the gas-liquid separator are connected with the outlet of the sand filling pipe.
In a preferred embodiment, a back-pressure valve for preventing produced crude oil from flowing back into the sand-packed pipe is arranged between the sand-packed pipe and the gas-liquid separator.
In a preferred embodiment, a one-way valve is provided between the back-pressure valve and the nitrogen gas source to prevent produced crude oil from flowing to the nitrogen gas source.
In a preferred embodiment, the experimental set-up comprises: a live oil tank connected to an inlet of the sand pack pipe to supply live oil to the sand pack pipe; a gas tank connected to an inlet of the sand pack pipe to supply gas to the sand pack pipe; a water tank connected to an inlet of the sand pack pipe to supply water to the sand pack pipe.
The utility model discloses a characteristics and advantage are: when implementing the experiment of simulation foam oil exhaustion exploitation, with the nitrogen gas source among this pressure reduction unit and the exit linkage of filling the sand pipe, set for gas mass flow controller's flow setting value, make the nitrogen gas in the nitrogen gas source pass through the gas vent, discharge according to setting for speed, thereby make the atmospheric pressure in the nitrogen gas source reduce continuously, the realization is controlled the pressure reduction speed of nitrogen gas source, be favorable to guaranteeing the stability that the output crude oil of filling the sand pipe flows, improve the accuracy of exhaustion exploitation experiment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of the connection between the pressure reducing device and the sand filling pipe provided by the present invention;
FIG. 2 is a front view of a gas mass flow controller in the pressure reducing device shown in FIG. 1;
fig. 3 is a plan view of a gas mass flow controller in the pressure reducing device shown in fig. 1.
The reference numbers illustrate:
10. a nitrogen source; 101. a nitrogen tank; 11. an exhaust port; 12. an air supply port;
20. a gas mass flow controller; 21. a flow detection module; 221. an air inlet; 222. an air outlet; 23. a signal interface;
30. a control device; 31. a computer;
41. a barometer; 42. a filter; 43. opening and closing the valve;
50. filling a sand pipe;
61. a gas-liquid separator; 62. a gas flow meter;
71. a back pressure valve; 72. a one-way valve;
81. a live oil tank; 82. a gas tank; 83. a water tank; 84. an ISCO pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example one
The utility model provides a pressure reduction device, as shown in figure 1, this pressure reduction device includes: a nitrogen gas source 10 provided with an exhaust port 11 and a gas supply port 12, wherein the gas supply port 12 is connected with a sand filling pipe 50; and a gas mass flow controller 20 connected to the exhaust port 11 and capable of controlling the flow rate of the gas passing through the exhaust port 11 to control the pressure drop rate of the nitrogen gas source 10.
The nitrogen gas source 10 may be a nitrogen tank 101 provided with a gas supply port 12 and a gas discharge port 11, and the gas supply port 12 and the gas discharge port 11 are both communicated with an inner chamber of the nitrogen tank 101 for storing nitrogen gas. At the start of the experiment, the gas pressure in the nitrogen tank 101 was equal to the original formation pressure to be simulated, and the gas supply port 12 of the nitrogen tank 101 was connected to the outlet of the sand fill pipe 50 so that the pressure at the outlet of the sand fill pipe 50 was equal to the gas pressure in the nitrogen tank 101. After the flow setting value of the gas mass flow controller 20 is set, the nitrogen in the nitrogen tank 101 flows through the gas mass flow controller 20 and is discharged outwards according to the set flow setting value, so that the air pressure in the nitrogen tank 101 is continuously reduced, the pressure drop speed of the nitrogen tank 101 is controlled, the stability of the flowing of the produced crude oil of the sand filling pipe 50 is guaranteed, and the accuracy of the failure mining experiment is improved.
As shown in fig. 2 and 3, the gas mass flow controller 20 is provided with a gas inlet 221 and a gas outlet 222, and the gas inlet 221 is connected with the gas outlet 11 of the nitrogen gas source 10; the gas mass flow controller 20 is provided with a signal interface 23 to connect with an external device, and the external device can input a control program to the gas mass flow controller 20 through the signal interface 23.
When the pressure reduction device works, nitrogen in the nitrogen source 10 is continuously discharged outwards through the exhaust port 11, and the amount of nitrogen stored in the nitrogen source 10 is gradually reduced. The ambient temperature is kept stable, and the pressure in the nitrogen gas source 10 is determined by the amount of nitrogen stored in the nitrogen gas source 10. However, when the rate of deflation of the nitrogen gas source 10 is kept constant, the rate of pressure drop of the nitrogen gas source 10 is dynamically varied.
In order to reduce the variation amplitude of the pressure drop speed, the inventor further improves the pressure drop device: the pressure reduction device comprises a control device 30, the control device 30 is connected with a signal interface 23 of the gas mass flow controller 20, and the control device 30 is used for setting a flow setting value of the gas mass flow controller 20. In some embodiments, the control device 30 includes a computer 31. The flow setting value of the gas mass flow controller 20 can be conveniently set and adjusted by the control device 30, so that the deflation speed of the nitrogen gas source 10 can be adjusted along with time in the experimental process, the pressure drop speed of the nitrogen gas source 10 is kept stable, and the change amplitude is reduced.
For example: the velocity of the pressure drop when it is desired to have the outlet pressure of the sand pack 50 for the time period T is V. If the deflation speed is kept stable in the whole time period T, the average pressure drop speed in the time period T can be made to be V, but the real-time pressure drop speed is dynamically changed in the whole process of the time period T and can deviate from V, and especially the deviation amplitude is larger in the initial stage and the end stage of the time period T.
Use the utility model provides a when pressure reduction means, then can divide into three time segment T1, T2, T3 with time quantum T to, the gassing speed in time segment T1 is established to Q1, and the gassing speed in time segment T2 is established to Q2, and the gassing speed in time segment T3 is established to Q3. Q1 ≠ Q2 ≠ Q3, and the control device can set Q1, Q2, and Q3 so that the average pressure drop velocity in the time segment t1, the average pressure drop velocity in the time segment t2, and the average pressure drop velocity in the time segment t3 are equal to V. Therefore, in each time segment, the real-time pressure drop speed can change, but the change amplitude is small, so that the change amplitude of the pressure drop speed is reduced in the time period T, and the real-time pressure drop speed is closer to V in the whole process.
The number of the time segments is increased to shorten the length of each time segment, and the change amplitude of the real-time pressure drop speed in each time segment can be further reduced, so that the deviation of the real-time pressure drop speed relative to V is smaller in the whole process of the time period T, the change relation of the real-time pressure value in the nitrogen gas source 10 on the time axis is realized, the change relation is close to the linear relation, and the improvement of the experimental accuracy is facilitated. In a specific experimental operation, the number of time segments into which the time period T is divided may be selected according to the accuracy required by the experiment.
The volume of the nitrogen gas source 10 is a fixed value, and the amount of nitrogen stored in the nitrogen gas source 10 and the air pressure in the nitrogen gas source 10 are in a one-to-one correspondence relationship under the condition that the temperature is kept stable. When the pressure of the nitrogen gas source 10 decreases from the initial pressure, the real-time pressure value of the nitrogen gas source 10 corresponds to the accumulated total deflation quantity value, i.e., the integral of the real-time deflation speed on the time axis corresponds to the real-time pressure value of the nitrogen gas source. Therefore, the total outgassing amount W1 when the gas pressure in the nitrogen gas source 10 is reduced to P1, the total outgassing amount W2 when the gas pressure is reduced to P2, and the total outgassing amount W3 when the gas pressure is reduced to P3 can be respectively calibrated, and accordingly: the amount of bleed gas during the pressure drop from one pressure value to another pressure value in a time segment, and the average bleed gas rate in that time segment, are set for the pressure in nitrogen gas source 10, thereby setting the bleed gas rate (i.e., the flow setting of gas mass flow controller 20) in each time segment.
In other cases, in order to realize the linear change of the gas pressure with time, a second functional relationship of the storage amount of the nitrogen gas in the nitrogen tank 101 with time may be calculated based on the first functional relationship between the storage amount of the nitrogen gas in the nitrogen tank 101 and the gas pressure value thereof, and a third functional relationship of the gas release speed with time in real time may be obtained by differentiating the second functional relationship. By setting the flow rate setting value of the gas mass flow controller 20 by the control device 30 in accordance with the third functional relationship, it is possible to realize a linear change in gas pressure with time.
The utility model discloses an in one embodiment, gaseous mass flow controller 20 has flow detection module 21, and flow detection module 21 and controlling means 30 signal connection, flow detection module 21 detect the actual gassing speed through gaseous mass flow controller 20 to with detect data transmission for controlling means 30.
The utility model discloses an in an embodiment, this pressure reduction means is including setting up in the barometer 41 of nitrogen gas source 10, barometer 41 and controlling means 30 signal connection, and barometer 41 detects the actual atmospheric pressure value of nitrogen gas source 10 to will detect data transmission and give controlling means 30, the operating personnel of being convenient for adjusts gassing speed according to actual atmospheric pressure value.
In order to ensure stable operation of the gas mass flow controller 20, a filter 42 is provided between the nitrogen gas source 10 and the gas mass flow controller 20. Specifically, two ends of the filter 42 are respectively connected with the exhaust port 11 of the nitrogen gas source 10 and the gas inlet 221 of the gas mass flow controller 20, and the filter 42 prevents dust, liquid and oil dirt from entering the gas mass flow controller 20, so as to improve the working stability and control accuracy of the gas mass flow controller.
Further, a switch valve 43 is arranged between the nitrogen gas source 10 and the gas mass flow controller 20, and in the experimental process, the exhaust can be stopped more conveniently through the switch valve 43, so that the air pressure in the nitrogen gas source 10 is kept constant, and the simulation experiment under the pressure maintaining state is carried out. In addition, when the actual pressure in the nitrogen gas source 10 changes and deviates from the designed change rule, the relationship between the actual pressure and the time can be adjusted by closing the switch valve 43 for a period of time.
Example two
The utility model provides an experimental facilities of simulation foam oil exhaustion exploitation, include: a sand-packed pipe 50, a gas-liquid separator 61 and the above-mentioned pressure reducing device; the gas supply port 12 of the nitrogen gas source 10 and the inlet of the gas-liquid separator 61 are both connected to the outlet of the sand-packed pipe 50. During the experiment, firstly, oil gas is introduced into the sand filling pipe 50 through the inlet of the sand filling pipe 50; then, the pressure at the outlet of the sand filling pipe 50 is gradually reduced from the original reservoir pressure through the pressure reducing device, and oil gas in the sand filling pipe 50 is discharged outwards through the outlet, so that the exhaustion exploitation process of the foam oil is simulated. The produced crude oil discharged from the outlet of the sand-packed pipe 50 flows into the gas-liquid separator 61 to be subjected to oil-gas separation, so that oil and gas can be respectively metered.
Further, a gas flow meter 62 is connected to a gas discharge port of the gas-liquid separator 61. The gas pressure in the gas-liquid separator 61 is atmospheric pressure, after the produced crude oil enters the gas-liquid separator 61, oil and gas are separated, and the escaped gas enters the gas flowmeter 62, so that the oil content and the gas content in the produced crude oil can be more accurately measured.
The utility model discloses an in the embodiment, be equipped with the back pressure valve 71 that is arranged in preventing the crude oil of output to flow back in the sand pack pipe 50 between sand pack pipe 50 and vapour and liquid separator 61, the pressure of back pressure valve 71 department keeps unanimous with the pressure of nitrogen gas source 10.
In one embodiment of the present invention, a check valve 72 is disposed between the back pressure valve 71 and the gas supply port 12 of the nitrogen gas source 10 to prevent the produced crude oil from flowing to the nitrogen gas source 10.
In order to facilitate the introduction of oil gas into the sand-packed pipe 50, the experimental facility further includes: a live oil tank 81 connected to an inlet of the sand packing pipe 50 to supply live oil to the sand packing pipe 50; an air tank 82 connected to an inlet of the sand fill pipe 50 to supply air to the sand fill pipe 50; a water tank 83 connected to an inlet of the sand fill pipe 50 to supply water to the sand fill pipe 50. The outlet of the active oil tank 81, the outlet of the air tank 82 and the outlet of the water tank 83 are respectively provided with a valve, and the active oil, the air and the water can enter the sand filling pipe 50 according to a set proportion through the active oil tank 81, the air tank 82 and the water tank 83.
Further, an ISCO pump 84 is also included in communication with the live oil tank 81, the air tank 82, and the water tank 83, the ISCO pump 84 providing power to drive the flow of live oil, air, and water to the sand fill pipe 50.
The above description is only for the embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.
Claims (10)
1. A voltage reducing device, comprising:
the nitrogen gas source is provided with a gas supply port and a gas exhaust port, and the gas supply port is used for connecting the sand filling pipe;
and the gas mass flow controller is connected with the exhaust port and can control the flow of the gas passing through the exhaust port so as to control the pressure drop speed of the nitrogen gas source.
2. The pressure reducing device according to claim 1, comprising: and the control device is connected with the gas mass flow controller and is used for setting a flow set value of the gas mass flow controller.
3. The voltage-reducing device according to claim 2, comprising: the gas mass flow controller is provided with a flow detection module, and the flow detection module is in signal connection with the control device.
4. The voltage-reducing device according to claim 2, comprising: the pressure reduction device comprises a barometer arranged on the nitrogen gas source, and the barometer is in signal connection with the control device.
5. The depressurization device of claim 1 wherein a filter is disposed between the nitrogen gas source and the gas mass flow controller.
6. The depressurization device of claim 1 wherein a switching valve is provided between the nitrogen gas source and the gas mass flow controller.
7. An experimental apparatus for simulating foam oil depletion exploitation, comprising: a sand-packed pipe, a gas-liquid separator and the pressure reducing device of any one of claims 1 to 6;
and the gas supply port of the nitrogen gas source and the inlet of the gas-liquid separator are connected with the outlet of the sand filling pipe.
8. The experimental facility as claimed in claim 7, wherein a back pressure valve for preventing the produced crude oil from flowing back into the sand pack pipe is provided between the sand pack pipe and the gas-liquid separator.
9. The experimental facility of claim 8, wherein a one-way valve is disposed between the back-pressure valve and the nitrogen gas source to prevent produced crude oil from flowing to the nitrogen gas source.
10. The assay apparatus of claim 7, comprising:
a live oil tank connected to an inlet of the sand pack pipe to supply live oil to the sand pack pipe;
a gas tank connected to an inlet of the sand pack pipe to supply gas to the sand pack pipe;
a water tank connected to an inlet of the sand pack pipe to supply water to the sand pack pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921211277.3U CN210714658U (en) | 2019-07-30 | 2019-07-30 | Pressure reduction device and experimental equipment for simulating foam oil exhaustion exploitation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921211277.3U CN210714658U (en) | 2019-07-30 | 2019-07-30 | Pressure reduction device and experimental equipment for simulating foam oil exhaustion exploitation |
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| CN210714658U true CN210714658U (en) | 2020-06-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720110A (en) * | 2020-06-30 | 2020-09-29 | 重庆科技学院 | A kind of pressure automatic tracking control gas well production simulation production control device and method |
| CN112002206A (en) * | 2020-08-24 | 2020-11-27 | 中国石油化工股份有限公司 | Shale gas reservoir failure mining experimental method and device |
-
2019
- 2019-07-30 CN CN201921211277.3U patent/CN210714658U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720110A (en) * | 2020-06-30 | 2020-09-29 | 重庆科技学院 | A kind of pressure automatic tracking control gas well production simulation production control device and method |
| CN112002206A (en) * | 2020-08-24 | 2020-11-27 | 中国石油化工股份有限公司 | Shale gas reservoir failure mining experimental method and device |
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