CN115773089A - Injection-production wellbore anti-corrosion instillation system - Google Patents
Injection-production wellbore anti-corrosion instillation system Download PDFInfo
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- CN115773089A CN115773089A CN202211482561.0A CN202211482561A CN115773089A CN 115773089 A CN115773089 A CN 115773089A CN 202211482561 A CN202211482561 A CN 202211482561A CN 115773089 A CN115773089 A CN 115773089A
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Abstract
The invention discloses an injection-production shaft anti-corrosion instillation system which comprises a raw material medicine tank, a mixed medicine tank, a medicine storage tank and a component monitor, wherein a pressurized flow pump comprises a pump shell and a pump body arranged in the pump shell, the pump body comprises an inflow port, a first impeller, a pressurized wheel set, a second impeller and an outflow port which are sequentially arranged from top to bottom, the first impeller, the pressurized wheel set and the second impeller are all arranged on a pump shaft penetrating through the pump body, the pressurized wheel set comprises a plurality of pressurized wheels capable of moving along the direction parallel to the pump shaft, spiral flow channels are arranged in the pressurized wheels, inlets and outlets are respectively arranged on two sides of the pressurized wheels, induction coils are arranged on the pressurized wheels, and the pressurized wheels are driven to move linearly by electromagnetic coils arranged on the outer wall of the pump body; the space in the pressurized flow pump is divided by a plurality of pressurizing wheels, and each pressurizing wheel can suck the liquid in the upper space of the pressurizing wheel and accelerate and conduct the liquid to the lower space of the pressurizing wheel, so that multistage linear acceleration is realized.
Description
Technical Field
The application relates to the field of corrosion prevention of petroleum injection and production, in particular to an injection and production wellbore corrosion prevention instillation system.
Background
Acidification is one of effective technical measures for increasing the yield of an oil-gas well and increasing the injection of a water injection well in the process of carbonate reservoir development. The acidizing process comprises acid pickling, matrix acidizing and fracture acidizing. The acidizing corrosion inhibitor is one of the most important additives in the acidizing construction process, and all industrial acids used in oil and gas well production increasing measures need to be added with the corrosion inhibitor to reduce the acid etching speed of a well bore pipe column. With the development of the drilling process and the improvement of the oil extraction technology, a large number of deep wells, ultra-deep wells and ultra-deep wells are put into development, and higher requirements are put forward on the performance of the corrosion inhibitor for acidification. The mainstream products of the current acidizing corrosion inhibitor are: a compound system taking ketone-aldehyde-amine condensate as a main agent and a compound system taking pyridine and quinoline composite quaternary ammonium salt as a main agent. However, in production practice, due to severe corrosion of oil wells by acid fluids, acidizing stimulation techniques were not applied and developed until after the 20 th century 30 years of the advent of acidizing corrosion inhibitors. The principle is that the permeability of stratum pores and cracks is recovered and improved through the dissolving and corrosion effects of acid liquor on rock cement or stratum pores, plugs in cracks and the like. In the acidizing construction process, corrosion of the underground pipe column and equipment by the acid liquor is inhibited by adding the corrosion inhibitor into the acid liquor.
Generally, a lot of acidizing corrosion inhibitors meet the requirement of an environment below 120 ℃, but the finished acidizing corrosion inhibitor has good corrosion inhibition effect under a higher temperature condition, particularly when the temperature exceeds 150 ℃, and the corrosion inhibitor conforms to the temperature required by an acidizing process, but the corrosion inhibitor under the high temperature condition needs to be added with corresponding additives, so that the cost is high, the corrosion inhibitor is integrally sticky, and the medicine adding speed (namely the total amount of medicines which can be actually added in unit time) is difficult to ensure; in the injection and production wellbore corrosion prevention instillation system, a thinner pipeline is needed to directly inject the corrosion inhibitor into the bottom of a wellbore, higher injection pressure is needed to ensure the total amount of drugs which can be actually injected in unit time under the condition of the same flow rate, and the condition of uneven flow rate is easy to occur due to overlarge pressure at the moment, so that aiming at the requirements in the prior art, the injection and production wellbore corrosion prevention instillation system is provided, the uniform speed and uniform distribution of the dosage can be realized under the condition that the corrosion prevention effect can be ensured through a corresponding storage tank pressurization structure and pump body flow measurement, the dosage of the corrosion inhibitor is reduced, the cost is reduced, the application aims at the characteristics of high fluid viscosity and high required pressure in the injection and production wellbore corrosion prevention instillation system, a pressurization flow pump suitable for the injection and production wellbore corrosion prevention instillation system is designed, the space in the pressurization flow pump is divided by a plurality of pressurization wheels, and each pressurization wheel can suck and accelerate (accelerate spiral gravity and self movement) the liquid in the upper space to the lower space of the pressurization wheel, and realize multistage linear acceleration.
Disclosure of Invention
In order to realize the purpose, the invention adopts the technical scheme that:
an injection-production wellbore anti-corrosion instillation system is characterized in that: the system comprises a raw material medicine tank, a mixed medicine tank, a medicine storage tank and a component monitor, wherein a circulating device is arranged on the mixed medicine tank to circularly match and mix raw material liquid medicines led in a plurality of raw material medicine tanks, and the raw material medicine tank, the mixed medicine tank, the component monitor and the medicine storage tank are sequentially communicated and discharge anticorrosive liquid medicines into a medicine adding pipe arranged in a shaft through a pressurized flow pump; the pressurized flow pump includes the pump case and sets up pump body in the pump case, the pump body includes from last inflow entrance, first impeller, pressurization wheelset, second impeller and the egress opening that sets gradually down, first impeller, pressurization wheelset, second impeller all set up and run through on the pump shaft of the pump body, pressurization wheelset includes that a plurality of can be along being on a parallel with the forcing wheel of pump shaft direction motion, the inside spiral flow channel that is provided with of forcing wheel, spiral flow channel is in the both sides of forcing wheel are provided with import and export respectively, be provided with induction coil on the forcing wheel, the forcing wheel is through setting up solenoid drive on the pump body outer wall carries out linear motion.
Further, evenly be provided with a plurality of groups of slide bar unit on the outer wall of the pump body, every group slide bar unit includes two parallel arrangement's slide bar, the slide bar along the axis direction of the pump body sets up, and every group slide bar unit top all is provided with a slide, and is adjacent it is provided with drive unit to fix between the slide, drive unit includes a plurality of actuating lever, the actuating lever is connected with exogenous actuating mechanism and can drives the slide slides along the axis direction.
Furthermore, the electromagnetic coil is located between two parallel sliding rods of each group of sliding rod units and is fixedly arranged below the sliding seat, an induction coil is arranged at a position, corresponding to the electromagnetic coil, of the outer side wall of the pressure wheel, and the electromagnetic coil is internally electrified to drive the induction coil to move in a direction parallel to the pump shaft, so that the pressure wheel is driven to move in a direction parallel to the pump shaft.
Furthermore, each adjacent sliding seat is connected through a connecting plate, and the driving unit is fixedly arranged on the connecting plate.
Further, a plurality of the raw materials medicinal cupping respectively through the force pump with mix the medicine mouth that advances at medicinal cupping top and link to each other, the discharge gate setting of raw materials medicinal cupping is in the jar body bottom of raw materials medicinal cupping, the inlet setting of raw materials medicinal cupping is in the top of raw materials medicinal cupping.
Furthermore, a stirring structure is arranged in the mixing medicine tank to stir and mix the raw material liquid medicine led in the plurality of raw material medicine tanks.
Further, circulating device is including setting up the extraction mechanism of mixed medicinal cupping bottom, and with the circulating pipe of extraction mechanism intercommunication, the other end of circulating pipe with the circulation mouth intercommunication at mixed medicinal cupping lateral wall top carries out external circulation injection between the upper and lower layer liquid in the mixed medicinal cupping.
Furthermore, the circulating device also comprises a switch valve which is arranged on the circulating pipe and can control the opening and closing of the circulating device.
Further, the extraction mechanism pass through the three-way valve respectively with the composition monitor with the circulating pipe intercommunication, the composition monitor can detect the ratio of various raw materials medicines in the mixed medicine jar.
Furthermore, a circulating outlet and a heating outlet are arranged on the component monitor, and the circulating outlet is communicated with the monitoring circulating port at the top of the mixed medicine tank through a monitoring circulating pipeline.
Advantageous effects
(1) The pressurizing flow pump capable of performing large-amplitude secondary pressurization on liquid is arranged, the liquid on the upper portion of the pressurizing flow pump is sucked into the spiral flow channel in the pressurizing wheel set through the axial downward movement of the pressurizing wheel set, the liquid located in the axial downward direction of the pressurizing wheel set is pressed into the next pressurizing wheel set through the acceleration of the spiral flow channel and the axial downward movement of the pressurizing wheel set, the pressurizing wheel set sequentially works until the pressurizing wheel set at the lowermost end pressurizes and discharges the liquid, and the driving of the high-pressure and high-viscosity fluid is achieved;
(2) This application has still set up the second impeller, can provide the business turn over buffering for the liquid through in the pressurized flow pump, guarantees the even speed, the average distribution of realizing the dose, is close to through measuring simultaneously the rotational speed of the second impeller of egress opening can obtain flowing through the fluid flow in the pressurized flow pump, the flow measurement mode of this application can more directly perceived accurate reaction flow through for the flow measurement mode among the prior art fluid flow in the pressurized flow pump can provide the business turn over buffering for the liquid through in the pressurized flow pump simultaneously, reduces because strengthen increasing, the axial velocity of flow that leads to is too fast, becomes stable axial flow with the tangential fluid motion that flows out in the pressurized wheel group through the rotation of second impeller, more stable even speed, the average distribution of realizing the dose.
Drawings
FIG. 1 is an overall block diagram of an injection and production wellbore corrosion prevention drip system of the present invention;
FIG. 2 is an enlarged view of a portion of the injection and production wellbore anti-corrosion drip system of the present invention;
FIG. 3 is an enlarged partial view of the injection production wellbore anti-corrosion drip system of the present invention (with portions of the structure removed for ease of illustration);
FIG. 4 is a close-up view of a third embodiment of the present invention showing the corrosion prevention instillation system for an injection and production wellbore;
FIG. 5 is an enlarged view of a portion of the pressurized flow pump of the present invention;
FIG. 6 is an overall view of the pressurized flow pump of the present invention with the housing removed;
FIG. 7 is a cross-sectional view of a pressurized flow pump according to the first aspect of the present invention;
FIG. 8 is a cross-sectional view of a second embodiment of the pressurized flow pump of the present invention;
FIG. 9 is a cross-sectional view of a third embodiment of a pressurized flow pump of the present invention;
fig. 10 is a cross-sectional view of a pressurized flow pump according to a fourth aspect of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Referring to fig. 1-10, an injection-production shaft anti-corrosive instillation system comprises a raw material medicine tank 1, a mixed medicine tank 2, a medicine storage tank 3 and a component monitor 4, wherein a circulating device 5 is arranged on the mixed medicine tank 2 for circulating, proportioning and mixing raw material liquid medicines led in a plurality of raw material medicine tanks 1, and the raw material medicine tanks 1, the mixed medicine tank 2, the component monitor 4 and the medicine storage tank 3 are sequentially communicated and discharge anti-corrosive liquid medicines into a medicine feeding pipe 8 arranged in a shaft through a pressurization flow pump 7; the pressurized flow pump 7 includes a pump housing 701 and a pump body 702 disposed in the pump housing 701, the pump body 702 includes an inflow port 703, a first impeller 704, a pressurizing wheel set 705, a second impeller 706 and an outflow port 707 sequentially disposed from top to bottom, the first impeller 704, the pressurizing wheel set 705 and the second impeller 706 are disposed on a pump shaft 708 penetrating through the pump body 702, the pressurizing wheel set 705 includes a plurality of pressurizing wheels 709 capable of moving in a direction parallel to the pump shaft 708, a spiral flow channel 7091 is disposed inside the pressurizing wheels 709, the spiral flow channel 7091 is disposed on two sides of the pressurizing wheels 709 respectively and is provided with an inlet and an outlet, an induction coil 711 is disposed on the pressurizing wheels 709, and the pressurizing wheels 709 are driven to move linearly by an electromagnetic coil 710 disposed on an outer wall of the pump body 702.
Although the injection and production wellbore anti-corrosion instillation system has the advantage of intelligent throttling, the corrosion inhibitor can be conveyed to the bottom of a well in a pressurized mode more efficiently, the dosage is accurately controlled by using an instillation structure, the use of the acidizing corrosion inhibitor is reduced, and further the cost is reduced, the medicine adding pipeline is arranged in an oil pipe instead of being arranged in a sleeve, the whole acidizing corrosion inhibitor is changed into viscous acid when the medicine adding pipeline is small in diameter and the temperature exceeds 150 ℃, so that the medicine adding pipeline is easy to block and needs higher liquid pressure to convey the acidizing corrosion inhibitor.
The outer wall of the pump body 702 is uniformly provided with a plurality of groups of sliding rod units 7021, each group of sliding rod units 7021 comprises two sliding rods 7022 which are arranged in parallel, each sliding rod 7022 is arranged along the axis direction of the pump body 702, a sliding seat 7023 is arranged above each group of sliding rod units 7021, a driving unit 7024 is fixedly arranged between the sliding seats 7023 and is adjacent to each other, each driving unit 7024 comprises a plurality of driving rods 7025, and each driving rod 7025 is connected with an external source driving mechanism to drive the sliding seats 7023 to slide along the axis direction.
Furthermore, the electromagnetic coil 710 is located between two parallel sliding rods 7022 of each set of sliding rod unit 7021 and is fixedly disposed below the sliding seat 7023, an induction coil 711 is disposed at a position on an outer side wall of the pressure wheel 709 corresponding to the electromagnetic coil 710, and the electromagnetic coil 710 is energized to drive the induction coil 711 to move in a direction parallel to the pump shaft 708, so as to drive the pressure wheel 709 to move in a direction parallel to the pump shaft 708.
Preferably, each adjacent sliding seat 7023 is connected through a connecting plate 7026, the driving unit 7024 is fixedly arranged on the connecting plate 7026, and the sliding seats 7023 are connected into a whole through the connecting plate 7026, so that the driving of the driving unit 7024 is more synchronous, and the whole driving efficiency is improved.
Preferably, check valves are provided in both the inflow port 703 and the outflow port 707; the first impeller 704 and the second impeller 706 are axial flow impellers, the liquid medicine flows to the first impeller 704 under the action of gravity and drives the first impeller 704 to rotate, the first impeller 704 provides initial pressurization for the liquid flowing through the pressurized flow pump 7, the second impeller 706 can provide in-out buffering for the liquid flowing through the pressurized flow pump 7, uniform speed and uniform distribution of the medicine amount are guaranteed, meanwhile, the flow rate of the fluid flowing through the pressurized flow pump 7 can be obtained by measuring the rotating speed of the second impeller 706 close to the outflow port 707, compared with a flow rate measuring mode in the prior art, the flow rate measuring mode of the present application can more intuitively and accurately reflect the flow rate of the fluid flowing through the pressurized flow pump 7, meanwhile, in-out buffering can be provided for the liquid flowing through the pressurized flow pump 7, the axial flow rate caused by strengthening increase is reduced to be too high, tangential fluid movement flowing out of the pressurized wheel set 705 is changed into stable axial flow through the rotation of the second impeller 706, and uniform speed and uniform distribution of the medicine amount is more stably achieved.
Preferably, a plurality of the raw material medicine tanks 1 are respectively connected with a medicine inlet 201 at the top of the mixed medicine tank 2 through pressure pumps 101, a discharge port 102 of each raw material medicine tank 1 is arranged at the bottom of the raw material medicine tank 1, and a liquid inlet 103 of each raw material medicine tank 1 is arranged at the top of the raw material medicine tank 1; through setting up the discharge gate 102 of raw materials medicinal cupping 1 in the jar body bottom of raw materials medicinal cupping 1, can extract the raw materials liquid medicine of bottom process a period of stewing, avoid the interior bubble content of raw materials liquid medicine higher, influence the actual ratio of raw materials liquid medicine.
Further, still be provided with the stirring structure in the mixed medicinal cupping 2 and stir the mixture to the leading-in raw materials liquid medicine in a plurality of raw materials medicinal cupping 1.
Further, circulating device 5 is including setting up extraction mechanism 501 of 2 bottoms in mixed medicine jar, and with circulation pipe 502 of extraction mechanism 501 intercommunication, the other end of circulation pipe 502 with the circulation mouth 503 intercommunication at 2 lateral wall tops in mixed medicine jar carries out the extrinsic cycle injection between the upper and lower floor's liquid in the mixed medicine jar, circulating device 5 with the stirring structure cooperation in the mixed medicine jar 2 can carry out the multiple cycle stirring to the liquid medicine in the mixed medicine jar 2, can promote the fusion degree between the different raw materials liquid medicine, can avoid again in the mixed medicine jar 2 liquid medicine to stew back upper and lower layering, produce the sediment.
Preferably, the circulation device 5 further comprises a switch valve 504, which is disposed on the circulation pipe 502 and can control the opening and closing of the circulation device 5.
Further, the drawing mechanism 501 is respectively communicated with the component monitor 4 and the circulation pipe 502 through a three-way valve 505, and the component monitor 4 can detect the ratio of various raw material drugs in the mixed drug tank 2.
Further, a circulation outlet 401 and a heating outlet 402 are arranged on the component monitor 4, and the circulation outlet 401 is communicated with a monitoring circulation port 506 at the top of the mixed drug tank 2 through a monitoring circulation pipeline 403.
Further, anticorrosive drip system still includes jar 6 of heating, jar 6 of heating sets up composition monitor 4 with between the medicine storage tank 3, jar 6 of heating with the export 402 intercommunication of heating of composition monitor 4.
Further, the top of medicine storage tank 3 is provided with into liquid mouth 301, go into liquid mouth 301 through feed liquor pipeline 302 with the play liquid outlet 601 intercommunication of heating jar, medicine storage tank 3's bottom is provided with leakage fluid dram 303 and force pump 304, force pump 304 can measure the process pressure and the velocity of flow of liquid in force pump 304, force pump 304 pass through riser 305 with pressurized flow pump 7 intercommunication, pressurized flow pump 7 to discharge anticorrosive liquid medicine in the medicine feeding pipe 8 that sets up in the pit shaft.
Preferably, the dosing pipe 8 arranged in the well hole is a capillary drip dosing pipe.
The pressurizing flow pump is designed aiming at the characteristics of high fluid viscosity and high required pressure in an injection and production shaft anti-corrosion drip system, the space in the pressurizing flow pump is divided by a plurality of pressurizing wheels, and each pressurizing wheel can suck and accelerate (spiral gravity acceleration and self-motion acceleration) liquid in the upper space of the pressurizing flow pump to be transmitted to the lower space of the pressurizing flow pump, so that multistage linear acceleration is realized; furthermore, the liquid medicine of this application flows to first impeller and drives first impeller rotation under the action of gravity, and first impeller provides initial pressurization for the liquid of the pressurized flow pump that flows through, and the design of second impeller can provide the business turn over buffering for the liquid in the pressurized flow pump through, guarantees to realize even speed, the average distribution of dose, simultaneously through measuring the rotational speed that is close to the second impeller of egress opening can obtain flowing through fluid flow in the pressurized flow pump, the flow measurement mode of this application can more directly perceived accurate reaction flow through for the flow measurement mode among the prior art fluid flow in the pressurized flow pump, can provide the business turn over buffering for the liquid in the pressurized flow pump simultaneously, reduce because strengthen increasing, the axial velocity of flow that leads to is too fast, become stable axial flow through the rotation of second impeller with the tangential fluid motion that flows out in the pressurized wheel group, more stable realization even speed, average distribution of dose.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (10)
1. An injection-production wellbore anti-corrosion instillation system, which is characterized in that: the system comprises a raw material medicine tank, a mixed medicine tank, a medicine storage tank and a component monitor, wherein a circulating device is arranged on the mixed medicine tank to circulate, proportion and mix the raw material medicine liquid introduced from a plurality of raw material medicine tanks, and the raw material medicine tank, the mixed medicine tank, the component monitor and the medicine storage tank are sequentially communicated and discharge the anti-corrosion medicine liquid into a medicine adding pipe arranged in a shaft through a pressurized flow pump; the pressurized flow pump includes the pump case and sets up pump body in the pump case, the pump body includes from last to down the inflow entrance that sets gradually, first impeller, pressurization wheelset, second impeller and egress opening, first impeller, pressurization wheelset, second impeller all set up and run through on the pump shaft of the pump body, the pressurization wheelset includes that a plurality of can be along being on a parallel with the forcing wheel of pump shaft direction motion, the inside spiral flow channel that is provided with of forcing wheel, spiral flow channel is in the both sides of forcing wheel are provided with import and export respectively, be provided with induction coil on the forcing wheel, the forcing wheel is through setting up linear motion is carried out in the solenoid drive on the pump body outer wall.
2. The injection-production wellbore preservative drip system of claim 1, wherein: evenly be provided with a plurality of groups of slide bar unit on the outer wall of the pump body, every group slide bar unit includes two parallel arrangement's slide bar, the slide bar along the axis direction setting of the pump body, every group slide bar unit top all is provided with a slide, and is adjacent the fixed drive unit that is provided with between the slide, drive unit includes a plurality of actuating lever, the actuating lever is connected with exogenous actuating mechanism and can drives the slide slides along the axis direction.
3. The injection-production wellbore preservation drip system of claim 2, characterized by: the electromagnetic coil is positioned between two parallel sliding rods of each group of sliding rod units and is fixedly arranged below the sliding seat, the outer side wall of the pressure wheel and the position corresponding to the electromagnetic coil are provided with induction coils, the electromagnetic coil is internally electrified to drive the induction coils to move in the direction parallel to the pump shaft, and then the pressure wheel is driven to move in the direction parallel to the pump shaft.
4. The injection-production wellbore corrosion-protective instillation system of claim 3, wherein: and each adjacent sliding seat is connected through a connecting plate, and the driving unit is fixedly arranged on the connecting plate.
5. The injection-production wellbore corrosion-protective instillation system of claim 1, wherein: a plurality of the raw materials medicinal cupping respectively through the force pump with mix the medicine mouth that advances at medicinal cupping top and link to each other, the discharge gate setting of raw materials medicinal cupping is in the jar body bottom of raw materials medicinal cupping, the inlet setting of raw materials medicinal cupping is in the top of raw materials medicinal cupping.
6. The injection-production wellbore anti-corrosion instillation system according to claim 1, wherein a stirring structure is further arranged in the mixing tank to stir and mix the raw material liquid medicine introduced from the plurality of raw material medicine tanks.
7. The injection-production wellbore anti-corrosion instillation system according to claim 6, wherein the circulation device comprises an extraction mechanism arranged at the bottom of the mixed chemical tank and a circulation pipe communicated with the extraction mechanism, and the other end of the circulation pipe is communicated with a circulation port at the top of the side wall of the mixed chemical tank to perform external circulation injection between upper and lower layers of liquid in the mixed chemical tank.
8. The injection-production wellbore anti-corrosion instillation system according to claim 7, wherein the circulation device further comprises a switch valve, and the switch valve is arranged on the circulation pipe and can control the opening and closing of the circulation device.
9. The injection-production wellbore antiseptic drip system according to claim 8, wherein the extraction mechanism is respectively communicated with the component monitor and the circulating pipe through a three-way valve, and the component monitor can detect the ratio of various raw material drugs in the mixed drug tank.
10. The injection-production wellbore antiseptic instillation system according to claim 9, wherein the composition monitor is provided with a circulation outlet and a warming outlet, and the circulation outlet is communicated with a monitoring circulation port at the top of the mixed medicine tank through a monitoring circulation pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211482561.0A CN115773089B (en) | 2022-11-24 | 2022-11-24 | Injection-production well shaft anti-corrosion instillation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211482561.0A CN115773089B (en) | 2022-11-24 | 2022-11-24 | Injection-production well shaft anti-corrosion instillation system |
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| CN115773089A true CN115773089A (en) | 2023-03-10 |
| CN115773089B CN115773089B (en) | 2024-06-11 |
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| CN113513479A (en) * | 2021-04-23 | 2021-10-19 | 江苏大学 | Multistage pump device for gas-liquid separation and use method |
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