CN112837597B - Oscillation acidification evaluation device - Google Patents
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- 230000020477 pH reduction Effects 0.000 title claims abstract description 17
- 238000011156 evaluation Methods 0.000 title claims abstract description 12
- 230000010355 oscillation Effects 0.000 title claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 61
- 238000002474 experimental method Methods 0.000 claims abstract description 57
- 238000000605 extraction Methods 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
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- 230000000903 blocking effect Effects 0.000 abstract description 6
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- 235000019647 acidic taste Nutrition 0.000 description 8
- 238000004090 dissolution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 239000002253 acid Substances 0.000 description 2
- 230000002925 chemical effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
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- 239000007924 injection Substances 0.000 description 2
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Abstract
The invention relates to an oscillation acidification evaluation device, which comprises an experiment generation mechanism, an experiment monitoring mechanism and a back pressure compensation mechanism which are mutually connected, wherein the experiment generation mechanism is used for applying preset frequency and pressure to an oil extraction auxiliary agent when a core blocks an oil extraction channel so that the oil extraction auxiliary agent acts on the core; the experiment monitoring mechanism is used for monitoring various parameters in the experiment generating mechanism; the back pressure compensation mechanism is used for compensating the pressure in the experiment generation mechanism through the parameters collected by the experiment monitoring mechanism. The invention can be used for researching the action effect of various oil extraction additives on different cores so as to improve the technology. Meanwhile, when the test system is used as a teaching display, a core damage contrast experiment can be intuitively demonstrated to prove that the combination effect of the vibration wave and the chemical blocking remover is better, the flow passage is not easy to block, and the reliability is better.
Description
Technical Field
The invention relates to the field of hydraulic fracturing experimental equipment, in particular to an oscillating acidification evaluation device.
Background
The acidification deblocking technology is one of the main technologies for solving the problems of high water injection pressure and stratum blockage removal of most oil fields in China, however, the effective acidification distance and the effective period of the conventional acidification technology are short, the existing method cannot completely adapt to the requirement of oil field water injection development, and in order to overcome the defect, in recent years, with the increasing of single well measures and large-scale acid fracturing technologies and the scale application of various oil extraction aids, a large amount of acidified oil and aged oil are generated and directly enter a combined station treatment system in the early stage to cause large impact on a crude oil treatment system. In view of the above, a new technology of organically combining the vibration wave and the chemical blocking remover is proposed, which not only facilitates the seepage effect, but also reduces or inhibits the secondary formation of the blocking object, thereby not only improving the chemical effect and prolonging the chemical effect distance, but also maintaining the chemical treatment effect and prolonging the effect period. Therefore, the technology has the functions of cleaning blastholes and removing the blockage of the near wellbore zone for developing oil fields with medium and low permeability and ultra-low permeability. In order to research the effect of various oil extraction additives on different cores, improve the technology and be used for teaching and demonstration, a set of oscillation acidification evaluation device needs to be developed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the oscillation acidification evaluation device which can be used for researching the action effect of various oil extraction additives on different cores so as to perfect the technology and be used for teaching and showing.
The technical scheme for solving the technical problems is as follows:
an oscillation acidification evaluation device comprises an experiment generating mechanism, an experiment monitoring mechanism and a back pressure compensating mechanism which are connected with each other,
the experiment generating mechanism is used for simulating that when the core blocks the oil extraction channel, preset frequency and pressure are applied to the oil extraction auxiliary agent, so that the oil extraction auxiliary agent acts on the core;
the experiment monitoring mechanism is used for monitoring various parameters in the experiment generating mechanism;
the back pressure compensation mechanism is used for compensating the pressure in the experiment generation mechanism through the parameters collected by the experiment monitoring mechanism.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the experiment generating mechanism comprises an oil cylinder, a frequency modulation piston cavity, a rock core clamping cavity and a liquid collecting pool which are sequentially communicated through liquid pipes, wherein a first piston is arranged in the oil cylinder and is connected with an external power source, and the first piston is hermetically connected with the oil cylinder and can do piston motion along the inner wall of the oil cylinder; a frequency modulation piston is arranged in the frequency modulation piston cavity, and the frequency modulation piston is hermetically connected with the frequency modulation piston cavity and can do piston motion along the inner wall of the frequency modulation piston cavity; a rock core is fixedly arranged in the rock core clamping cavity and is hermetically connected with the rock core clamping cavity; the oil extraction device is characterized in that one end, close to the frequency modulation piston cavity, of the rock core clamping cavity is a solution cavity, an oil extraction auxiliary agent is filled in the solution cavity, one end, away from the frequency modulation piston cavity, of the rock core clamping cavity is an air cavity, a drain pipe is arranged at the end of the air cavity, and the drain pipe is connected to the liquid collecting tank.
Further, experiment monitoring mechanism include data acquisition control system and respectively with data acquisition control system signal connection's first pressure gauge, flowmeter, first pressure gauge sets up frequency modulation piston cavity with in the pipeline between the rock core centre gripping cavity, the flowmeter sets up on the drain pipe.
Further, the experiment generation mechanism is also provided with a throttle valve, and the throttle valve is arranged on the drain pipe between the flowmeter and the liquid collecting pool.
Furthermore, the back pressure compensation mechanism comprises a servo pump and a second pressure gauge, the servo pump and the second pressure gauge are respectively in signal connection with the data acquisition control system, the second pressure gauge is arranged in the oil cylinder and a pipeline between the frequency modulation piston cavities, the water inlet end of the servo pump is connected into the liquid collecting tank, and the water outlet end of the servo pump is communicated with the oil cylinder and the pipeline between the frequency modulation piston cavities.
Further, a fixing bolt is arranged below the oil cylinder, the oil cylinder is fixedly installed above the frequency modulation piston cavity through the fixing bolt, so that a pipeline between the oil cylinder and the frequency modulation piston cavity is kept vertical, and the second pressure gauge is installed on the fixing bolt.
Further, the experiment generating mechanism is further provided with a one-way throttle valve, and the one-way throttle valve is arranged in a pipeline between the frequency modulation piston cavity and the rock core clamping cavity.
Further, the experiment generating mechanism is further provided with a safety valve, one end of the safety valve is communicated with a pipeline between the one-way throttle valve and the rock core clamping cavity, and the other end of the safety valve is communicated with the liquid collecting tank.
Furthermore, a servo driver is further arranged on the servo pump, and the servo pump is in signal connection with the data acquisition control system through the servo driver.
The invention has the beneficial effects that: the dissolution of the core in a certain oil extraction auxiliary agent (such as an acidity solution) under the condition of certain frequency impact is simulated by adopting an external power source, a piston oil cylinder and a frequency-modulated piston. And the solution state of the core in the solution with certain acidity is compared with the solution state of the core in the solution with certain acidity to form comparative experimental data, and the relatively excellent vibration impact frequency corresponding to the oil extraction auxiliary agents with different acidity is researched. Can be used for researching the action effect of various oil extraction additives on different cores so as to perfect the technology. Meanwhile, when the test system is used as a teaching display, a core damage contrast experiment can be intuitively demonstrated to prove that the combination effect of the vibration wave and the chemical blocking remover is better, the flow passage is not easy to block, and the reliability is better.
Drawings
FIG. 1 is a schematic view of the principle of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the rock core clamping device comprises a first piston, 2, an oil cylinder, 3, a frequency-modulated piston cavity, 4, a frequency-modulated piston, 5, a rock core clamping cavity, 501, a solution cavity, 502, an air cavity, 6, a rock core, 7, a liquid collecting tank, 8, a data acquisition control system, 9, a first pressure gauge, 10, a flow meter, 11, a throttle valve, 12, a servo pump, 13, a second pressure gauge, 14, a one-way throttle valve, 15, a safety valve, 16, a servo driver, 17, a fixing bolt, 18 and a water discharging pipe.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The device for evaluating the oscillation acidification shown in figure 1 comprises an experiment generating mechanism, an experiment monitoring mechanism and a back pressure compensating mechanism which are connected with each other,
the experiment generating mechanism is used for simulating that when the core 6 blocks the oil extraction channel, preset frequency and pressure are applied to the oil extraction auxiliary agent, so that the oil extraction auxiliary agent acts on the core 6;
the experiment monitoring mechanism is used for monitoring various parameters in the experiment generating mechanism;
the back pressure compensation mechanism is used for compensating the pressure in the experiment generation mechanism through the parameters collected by the experiment monitoring mechanism.
When no external power source is applied, the experiment generation mechanism simulates a static experiment, namely, only using the oil extraction additive to corrode and dissolve the rock core 6 blocking the oil extraction channel, and the operator records the data recorded by the experiment monitoring mechanism, such as hydraulic data and dissolution time data. When an external power source is applied, the experiment generating mechanism simulates a dynamic experiment, namely, under the set frequency and pressure, the oil extraction auxiliary agent corrodes and dissolves the rock core 6; at the moment, the experiment monitoring mechanism monitors the hydraulic pressure, the dissolving time and other data of the oil extraction auxiliary agent so as to compare the test data of various subsequent test conditions. The pressure compensation mechanism compensates the hydraulic pressure of the experiment generation mechanism according to the monitoring data of the experiment monitoring mechanism so as to keep the power of the experiment generation mechanism unchanged. During dynamic experiments, the frequency and the pressure of an external power source can be adjusted according to oil extraction aids with different concentrations so as to research the frequency and pressure combination with the optimal experimental effect under various concentrations.
On the basis of the above technical solution, the present embodiment can be further improved as follows.
In this embodiment, as shown in fig. 1, the experiment generation mechanism includes an oil cylinder 2, a frequency modulation piston cavity 3, a rock core clamping cavity 5 and a liquid collecting tank 7 which are sequentially communicated through liquid pipes, and oil extraction aids are filled in liquid pipes between the oil cylinder 2 and the frequency modulation piston cavity 3, between the frequency modulation piston cavity 3 and the rock core clamping cavity 5. The piston type hydraulic cylinder is characterized in that a first piston 1 is arranged in the oil cylinder 2, the first piston 1 is connected with an external power source, and the first piston 1 is hermetically connected with the oil cylinder 2 and can do piston motion along the inner wall of the oil cylinder 2. And a frequency modulation piston 4 is arranged in the frequency modulation piston cavity 3, and the frequency modulation piston 4 is hermetically connected with the frequency modulation piston cavity 3 and can do piston motion along the inner wall of the frequency modulation piston cavity 3. A rock core 6 is fixedly arranged in the rock core clamping cavity 5, and the rock core 6 is hermetically connected with the rock core clamping cavity 5; the one end that core centre gripping cavity 5 is close to frequency modulation piston chamber 3 is solution chamber 501, fill oil recovery auxiliary agent in the solution chamber 501, core centre gripping cavity 5 deviates from the one end of frequency modulation piston chamber 3 is air chamber 502, the tip of air chamber 502 is equipped with drain pipe 18, drain pipe 18 connects the collecting tank 7.
When an external power source is applied to the piston, the piston does piston motion in the oil cylinder 2 to push the liquid in the liquid pipe to move. The liquid in the liquid pipe pushes the frequency modulation piston 4 in the frequency modulation piston cavity 3 to move, so that the purpose that an external power source adjusts the vibration frequency and the vibration amplitude of the frequency modulation piston 4 is achieved. The frequency modulation piston 4 applies vibration to the oil extraction auxiliary agent in the core clamping cavity 5, so that vibration impact of the oil extraction auxiliary agent on the core 6 is realized. The vibration frequency and the stroke of the piston in the oil cylinder 2 can be adjusted by adjusting an external power source, so that the vibration impact frequency and the vibration impact amplitude of the oil extraction auxiliary agent on the rock core 6 can be adjusted.
The oil recovery aid of this example was a HCL solution. The different effects of oil recovery aids of different acidity on the action of the core 6 can be simulated by adjusting the concentration of the HCL solution.
Further, experiment monitoring mechanism include data acquisition control system 8 and respectively with data acquisition control system 8 signal connection's first pressure gauge 9, flowmeter 10, first pressure gauge 9 sets up frequency modulation piston chamber 3 with in the pipeline between the rock core centre gripping cavity 5, flowmeter 10 sets up on the drain pipe 18. The first pressure gauge 9 is used to monitor the hydraulic pressure of the production aid acting on the core 6 and feed it back to the data acquisition control system 8. The flow meter 10 is used to monitor the gas flow through the air cavity 502 to determine whether the core 6 has corroded through and whether a secondary blockage has formed in the core holding cavity 5 after corrosion.
Further, the experiment generating mechanism is also provided with a throttle valve 11, and the throttle valve 11 is arranged on the drain pipe 18 between the flowmeter 10 and the liquid collecting tank 7. The throttle valve 11 is used for slowly discharging the oil extraction aid from the drain pipe 18 after the core 6 is corroded and penetrated, and preventing the oil extraction aid from being sprayed out of the drain pipe 18 under the hydraulic action to impact the liquid collecting tank 7 and cause acid liquid splashing.
Further, the back pressure compensation mechanism includes servo pump 12, second pressure gauge 13, servo pump 12, second pressure gauge 13 respectively with 8 signal connection of data acquisition control system, second pressure gauge 13 set up in the hydro-cylinder 2 with in the pipeline between the frequency modulation piston chamber 3, the end of intaking of servo pump 12 inserts collecting tank 7, the play water end intercommunication of servo pump 12 the hydro-cylinder 2 with pipeline between the frequency modulation piston chamber 3. When the second pressure gauge 13 monitors that the hydraulic pressure between the oil cylinder 2 and the frequency-modulation piston 4 is lower than a preset value, the data acquisition control system 8 drives the servo pump 12 to operate, and liquid in the liquid collecting tank 7 is pumped into a pipeline between the oil cylinder 2 and the frequency-modulation piston 4 to compensate the hydraulic pressure in the pipeline.
Further, a fixing bolt 17 is arranged below the oil cylinder 2, the oil cylinder 2 is fixedly installed above the frequency modulation piston cavity 3 through the fixing bolt 17, so that a pipeline between the oil cylinder 2 and the frequency modulation piston cavity 3 is kept vertical, and the second pressure gauge 13 is installed on the fixing bolt 17. Fixing bolt 17 installs on support piece (for example wall, experiment support frame, laboratory bench etc.), for hydro-cylinder 2 provides effectual location, with hydro-cylinder 2 fixed mounting directly over frequency modulation piston 4, makes the pipeline between hydro-cylinder 2 and the frequency modulation piston chamber 3 keep vertical, can reduce the resistance that the pipeline is crooked to bring when exerting external power source on first piston 1 in hydro-cylinder 2. Second pressure gauge 13 is installed on fixing bolt 17, and fixing bolt 17 provides the strong point for second pressure gauge 13's installation for pressure detection is more accurate in the pipeline.
Further, the experiment generating mechanism is also provided with a one-way throttle valve 14, and the one-way throttle valve 14 is arranged in a pipeline between the frequency modulation piston cavity 3 and the rock core clamping cavity 5. The check throttle 14 keeps the pressure steady during the experiment.
Further, the experiment generating mechanism is further provided with a safety valve 15, one end of the safety valve 15 is communicated with a pipeline between the one-way throttle valve 14 and the core clamping cavity 5, and the other end of the safety valve 15 is communicated with the liquid collecting tank 7. When the hydraulic pressure of the production aid acting on the core 6 exceeds the preset pressure value of the safety valve 15, the safety valve 15 opens, releasing part of the production aid into the sump 7 to maintain the hydraulic pressure in the piping.
Further, a servo driver 16 is further arranged on the servo pump 12, and the servo pump 12 is in signal connection with the data acquisition control system 8 through the servo driver 16. The data acquisition control system 8 sends a control command to the servo driver 16, and the servo driver 16 sends a driving signal to drive the servo pump 12 to operate.
In the embodiment, an external power source, a piston oil cylinder 2 and a frequency modulation piston 4 are adopted to match to simulate the dissolution condition of a rock core 6 in a certain oil extraction auxiliary agent (such as an acidity solution) under the condition of certain frequency impact. And the solution of the core 6 under the static condition and the solution of the core 6 under the certain acidity form comparative experimental data, and the relatively excellent vibration impact frequency corresponding to the oil extraction auxiliary agents with different acidities is researched. Can be used for researching the action effect of various oil extraction additives on different rock cores 6 so as to perfect the technology. Meanwhile, when the test system is used as a teaching display, the damage contrast experiment of the core 6 can be intuitively demonstrated, so that the combination effect of the vibration wave and the chemical blocking remover is better, the flow passage is not easy to block, and the reliability is better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. An oscillation acidification evaluation device is characterized by comprising an experiment generating mechanism, an experiment monitoring mechanism and a back pressure compensating mechanism which are connected with each other,
the experiment generating mechanism is used for simulating that when the core (6) blocks an oil extraction channel, preset frequency and pressure are applied to the oil extraction auxiliary agent, so that the oil extraction auxiliary agent acts on the core (6);
the experiment generating mechanism comprises an oil cylinder (2), a frequency modulation piston cavity (3), a core clamping cavity (5) and a liquid collecting pool (7) which are sequentially communicated through liquid pipes, wherein a first piston (1) is arranged in the oil cylinder (2), the first piston (1) is connected with an external power source, and the first piston (1) is hermetically connected with the oil cylinder (2) and can do piston motion along the inner wall of the oil cylinder (2); a frequency modulation piston (4) is arranged in the frequency modulation piston cavity (3), and the frequency modulation piston (4) is hermetically connected with the frequency modulation piston cavity (3) and can do piston motion along the inner wall of the frequency modulation piston cavity (3); a rock core (6) is fixedly arranged in the rock core clamping cavity (5), and the rock core (6) is hermetically connected with the rock core clamping cavity (5); one end, close to the frequency modulation piston cavity (3), of the core clamping cavity (5) is a solution cavity (501), oil extraction auxiliaries are filled in the solution cavity (501), one end, away from the frequency modulation piston cavity (3), of the core clamping cavity (5) is an air cavity (502), a drain pipe (18) is arranged at the end part of the air cavity (502), and the drain pipe (18) is connected to the liquid collecting pool (7);
the experiment monitoring mechanism is used for monitoring various parameters in the experiment generating mechanism;
the back pressure compensation mechanism is used for compensating the pressure in the experiment generation mechanism through the parameters collected by the experiment monitoring mechanism.
2. The device for oscillating acidification evaluation according to claim 1, wherein the experiment monitoring mechanism comprises a data acquisition control system (8) and a first pressure gauge (9) and a flow meter (10) respectively in signal connection with the data acquisition control system (8), wherein the first pressure gauge (9) is arranged in the pipeline between the frequency modulation piston cavity (3) and the core clamping cavity (5), and the flow meter (10) is arranged on the drain pipe (18).
3. An oscillating acidification evaluation device according to claim 2, wherein the experiment generation means is further provided with a throttle valve (11), said throttle valve (11) being arranged on the drain pipe (18) between the flow meter (10) and the sump (7).
4. The oscillation acidification evaluation device according to claim 2, wherein the back pressure compensation mechanism comprises a servo pump (12) and a second pressure gauge (13), the servo pump (12) and the second pressure gauge (13) are respectively in signal connection with the data acquisition control system (8), the second pressure gauge (13) is arranged in a pipeline between the oil cylinder (2) and the frequency modulation piston cavity (3), the water inlet end of the servo pump (12) is connected into the liquid collecting tank (7), and the water outlet end of the servo pump (12) is communicated with a pipeline between the oil cylinder (2) and the frequency modulation piston cavity (3).
5. The device for evaluating the oscillation acidification according to claim 4, characterized in that a fixing bolt (17) is arranged below the oil cylinder (2), the fixing bolt (17) fixedly installs the oil cylinder (2) above the frequency modulation piston cavity (3) to keep a pipeline between the oil cylinder (2) and the frequency modulation piston cavity (3) vertical, and the second pressure gauge (13) is installed on the fixing bolt (17).
6. An oscillation acidification evaluation device according to claim 1, wherein the experiment generation mechanism is further provided with a one-way throttle valve (14), the one-way throttle valve (14) being arranged in the conduit between the frequency modulated piston chamber (3) and the core holding cavity (5).
7. The apparatus according to claim 6, wherein the experiment generating mechanism is further provided with a safety valve (15), one end of the safety valve (15) is communicated with the pipeline between the one-way throttle valve (14) and the core holding cavity (5), and the other end of the safety valve (15) is communicated with the liquid collecting tank (7).
8. The device for oscillating acid-base assessment according to claim 4, wherein a servo driver (16) is further provided on the servo pump (12), and the servo pump (12) is in signal connection with the data acquisition control system (8) through the servo driver (16).
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| CN101864949B (en) * | 2010-06-18 | 2011-08-10 | 西南石油大学 | Test device and method for simulating acid etching crack flow guide capability |
| CN101985875B (en) * | 2010-09-27 | 2013-05-08 | 中国石油大学(华东) | Hydraulic pulse-assisted reservoir chemical remedial treatment experiment device and method |
| CN102031955B (en) * | 2010-09-27 | 2013-04-17 | 中国石油大学(华东) | Ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and experimental method |
| CN102528759B (en) * | 2012-02-08 | 2014-12-24 | 王建华 | Multipurpose pneumatic impactor |
| CN103196762B (en) * | 2013-04-25 | 2014-10-15 | 重庆地质矿产研究院 | Experimental device and method for reforming shale gas reservoir through pulse hydraulic fracturing |
| CN203275258U (en) * | 2013-06-05 | 2013-11-06 | 海安县石油科研仪器有限公司 | Rock core acidification flow testing device |
| CN104389853B (en) * | 2014-11-03 | 2016-04-13 | 中国矿业大学 | Variable-speed step type hydraulic drive unit and method |
| US10443363B2 (en) * | 2016-10-31 | 2019-10-15 | Exxonmobil Upstream Research Company | Method and system for core flood testing for reservoir souring studies |
| CN111289421B (en) * | 2020-03-30 | 2024-10-15 | 江苏拓创科研仪器有限公司 | Dynamic filter loss instrument for fracturing and acidizing working solution |
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