CN114526024A - Screen cloth leaks sand monitoring devices - Google Patents
Screen cloth leaks sand monitoring devices Download PDFInfo
- Publication number
- CN114526024A CN114526024A CN202210154604.6A CN202210154604A CN114526024A CN 114526024 A CN114526024 A CN 114526024A CN 202210154604 A CN202210154604 A CN 202210154604A CN 114526024 A CN114526024 A CN 114526024A
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- liquid
- liquid phase
- screen
- turbid liquid
- turbid
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- 239000004576 sand Substances 0.000 title claims abstract description 28
- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
- 239000004744 fabric Substances 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000007791 liquid phase Substances 0.000 claims abstract description 64
- 239000002002 slurry Substances 0.000 claims abstract description 34
- 230000005484 gravity Effects 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 5
- 239000013049 sediment Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 abstract description 13
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000007790 solid phase Substances 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
- E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention aims to provide a screen sand leakage monitoring device, and belongs to the technical field of material vibration screening. The device comprises a liquid phase collecting piece for collecting a liquid phase screened by a vibrating screen, wherein the liquid phase is naturally precipitated in the liquid phase collecting piece into a supernatant and a lower turbid liquid, and the supernatant is discharged to a lower flow through a clear liquid conveying groove; the lower layer turbid liquid is connected with a feed inlet of the vibrating screen through a slurry pump; a specific gravity sensor is arranged in the liquid phase collecting part and is connected with a PLC (programmable logic controller) in the control cabinet through a signal line; the PLC controls the start and stop of the slurry pump at regular time, so that the density of the lower layer turbid liquid is controlled within a preset value, and an alarm signal is sent out when the density of the lower layer turbid liquid exceeds the preset value. According to the invention, the automatic monitoring of sand leakage of the screen is realized through the PLC, and the sand leakage phenomenon can be accurately found in time, so that field workers can quickly respond.
Description
Technical Field
The invention relates to the technical field of material vibration screening, in particular to a screen sand leakage monitoring device.
Background
In the drilling process of a drilling team, due to the fact that a screen is abraded or the screen is not tightly pressed to cause poor sealing and the like, a liquid phase screened by a vibrating screen contains a part of large-particle solid phase, harmful solid phase in a liquid phase collecting tank is increased, the specific gravity of slurry is increased, and troubles are brought to the subsequent treatment process. Even the drilling wall is affected, so that well collapse, drill sticking and other drilling accidents can happen.
At present, in order to prevent the mud containing harmful solid phase in the liquid phase collecting tank from bringing trouble to the subsequent treatment process, the following two methods are generally adopted: firstly, set up the filter screen at the liquid outlet of liquid phase holding vessel and filter its inside harmful solid phase. Although the method has a good filtering effect on harmful solid phases, a specially-assigned person is required to irregularly clean the filter screen, and if the filter screen is carelessly cleaned, the filter screen is blocked, so that the filter screen overflows a tank, and sand leakage of the filter screen is difficult to find in time; and secondly, when the vibrating screen is in a shutdown state, the screen is cleaned, and whether the screen is damaged or not or whether the sealing is not tight or not is determined visually. The method can be implemented only by cleaning the screen when the vibrating screen is in a non-working state, and the working efficiency of drilling work of a drilling team is seriously influenced if the vibrating screen is stopped manually.
Disclosure of Invention
The invention aims to provide a screen sand leakage monitoring device, which realizes automatic monitoring of screen sand leakage through the cooperation of a PLC (programmable logic controller), a specific gravity sensor and a slurry pump, can accurately and timely find sand leakage, enables field workers to quickly respond, and solves the technical problems of well collapse, drill sticking and other drilling accidents caused by troubles brought to subsequent processing procedures due to the fact that sand leakage cannot be timely found in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a screen sand leakage monitoring device comprises a liquid phase collecting piece for collecting a liquid phase screened by a vibrating screen, wherein the liquid phase is naturally precipitated in the liquid phase collecting piece into a supernatant and a lower turbid liquid, and the supernatant is discharged to a lower flow through a supernatant conveying groove;
the bottom of the liquid phase collecting part is provided with a turbid liquid outlet, the turbid liquid outlet is connected with a liquid inlet of a slurry pump through a turbid liquid suction manifold, and a liquid outlet of the slurry pump is connected with a feed inlet of a vibrating screen through a turbid liquid discharge manifold;
a specific gravity sensor for detecting the density of the turbid liquid at the lower layer is arranged in the liquid phase collecting part and is connected with a PLC (programmable logic controller) in the control cabinet through a signal line;
the PLC controls the start and stop of the slurry pump at regular time, so that the density of the lower layer turbid liquid is controlled within a preset value, and an alarm signal is sent out when the density of the lower layer turbid liquid exceeds the preset value.
As a modification of the invention, the liquid phase collecting member has a V-shaped tank structure.
As an improvement of the invention, the slurry pump further comprises a base, wherein a frame mechanism is installed on the base, at least one vibrating screen is installed at the top of the frame mechanism, the top end of the liquid phase collecting piece is connected to the frame mechanism below the vibrating screen, and the slurry pump is installed on the base through a slurry pump installation seat.
The invention has the beneficial effects that: the invention provides a screen sand leakage monitoring device which comprises a liquid phase collecting piece used for collecting a liquid phase screened by a vibrating screen, wherein the liquid phase is naturally precipitated in the liquid phase collecting piece into a supernatant and a lower turbid liquid, and the supernatant is discharged to a lower flow through a supernatant conveying groove. In order to prevent the hardening of the lower layer turbid liquid, the density of the lower layer turbid liquid is always controlled within a preset value, and the lower layer turbid liquid is regularly discharged to a feeding hole of the vibrating screen through a slurry pump to be screened again. When the density of the liquid phase in the liquid phase collecting part is monitored by the specific gravity sensor and is rapidly increased and exceeds a preset value, the vibrating screen has the sand leakage phenomenon caused by damage to a screen or untight sealing and the like, the PLC controller controls the slurry pump to be started, and the liquid phase with a large amount of solid-phase particles is pumped back to the feed inlet of the vibrating screen to be screened again. Meanwhile, the system gives an alarm, field workers react quickly to check whether the screen is damaged or not or whether the screen bed is not sealed tightly or not, and the like. The invention realizes real-time online automatic monitoring of sand leakage of the screen under the cooperative action of the specific gravity sensor, the slurry pump and the PLC, and solves the technical problems that in the prior art, the sand leakage can be found to a certain extent by field workers, and further troubles are brought to subsequent processing procedures, and well drilling accidents such as well collapse, drill sticking and the like are caused.
Further, in order to facilitate the rapid precipitation and delamination of the supernatant and the lower turbid liquid, the liquid phase collection part is of a V-shaped tank structure.
Further, the screen sand leakage monitoring device further comprises a base, a frame mechanism is installed on the base, at least one vibrating screen is installed at the top of the frame mechanism, the top end of the liquid-phase collecting piece is connected to the frame mechanism below the vibrating screen, and the slurry pump is installed on the base through a slurry pump installing seat. Through the design, the sand leakage monitoring device for the screen is integrated and modularly designed, is convenient to disassemble, assemble and transport, and is simple in structure and low in cost.
Drawings
Fig. 1 is a schematic structural diagram of a screen sand leakage monitoring device of the present invention.
In the figure, 1, a clear liquid conveying tank; 2. a frame mechanism; 3. vibrating screen; 4. a specific gravity sensor; 5. discharging the turbid liquid out of a manifold; 6. a liquid phase collection member; 7. a base; 8. a slurry pump mounting base; 9. a slurry pump; 10. a turbid liquid suction manifold; 11. the lower layer of turbid liquid; 12. and (4) supernatant liquor.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
It should be noted that the terms of orientation such as up, down, left, right, etc. in the embodiments of the present invention are only relative concepts or reference to the normal use state of the product, and should not be considered as limiting.
As shown in fig. 1, a screen sand leakage monitoring device includes a liquid phase collecting member 6 for collecting a liquid phase screened by a vibrating screen 3. The liquid phase after being screened by the vibrating screen is naturally precipitated in the liquid phase collecting piece 6 into supernatant liquid 13 and lower turbid liquid 12, the supernatant liquid 13 is discharged to the next flow through the clear liquid conveying tank 1, and the next flow is a degassing, desanding or desliming system. The bottom of the liquid phase collecting part 6 is provided with a turbid liquid outlet, the turbid liquid outlet is connected with a liquid inlet of a slurry pump 10 through a turbid liquid suction manifold 11, the liquid outlet of the slurry pump 10 is connected with a feeding hole of a vibrating screen 3 through a turbid liquid discharge manifold 5, and the feeding hole of the vibrating screen 3 refers to an aqueduct of the vibrating screen. In order to facilitate the rapid sedimentation and stratification of the supernatant liquid 13 and the lower turbid liquid 12, the liquid phase collecting part 6 is of a V-shaped tank structure, and in the embodiment, the liquid phase collecting part 6 adopts a tank structure with a rectangular top liquid inlet and a V-shaped cross section. A specific gravity sensor 4 for detecting the density of the turbid liquid at the lower layer in real time is arranged in the liquid phase collecting part 6, and the specific gravity sensor 4 is connected with a PLC (programmable logic controller) in the control cabinet 7 through a signal line. The PLC controls the start and stop of the slurry pump 10 in a timing mode, the lower layer turbid liquid 12 with deposited solid phases at the bottom of the liquid phase collecting piece 6 in normal work is pumped back to the feeding hole of the vibrating screen 3 for secondary screening treatment, and the density of the lower layer turbid liquid 12 is guaranteed to be always controlled within a preset value. When the sand leakage phenomenon appears, the lower turbid liquid 12 in the liquid phase collecting piece 6 will gather the large granule solid phase, the density of the lower turbid liquid 12 exceeds the preset value at this moment, the proportion sensor 4 transmits the density signal of the lower turbid liquid 12 monitored in real time to the PLC controller in the control cabinet 7, the system sends out an alarm signal when exceeding the preset value, the site worker rapidly reacts, whether the screen cloth is damaged or whether the sieve bed is not tight, etc., the slurry pump 10 is started simultaneously, the lower turbid liquid 12 with a large amount of solid phase particles is pumped back to the feed inlet of the vibrating screen 3 for secondary screening treatment, the phenomenon that the upper clear liquid 13 contains the large granule solid phase and affects the subordinate flow is avoided, the probability that well drilling accident phenomena such as well collapse, drilling sticking and the like occur is greatly reduced.
Preferably, the screen sand leakage monitoring device further comprises a base 8, the base 8 is provided with a frame mechanism 2, and the top of the frame mechanism 2 is provided with at least one vibrating screen 3, such as one, two or three vibrating screens, in this embodiment three vibrating screens. The top end of the liquid phase collecting member 6 is connected to the frame means 2 below the vibrating screen 3. Preferably, to facilitate the collection of the liquid phase screened by the vibrating screen 3, the size of the liquid inlet at the top of the liquid phase collecting member 6 is adapted to the overall size of the three vibrating screens 3. The size of the liquid inlet at the top of the liquid phase collecting part 6 is matched with the overall size of a plurality of vibrating screens 3, for example, one vibrating screen 3 is adopted, and the size of the liquid inlet of the liquid phase collecting part 6 is not smaller than the size of the screen mesh at the lower part of the vibrating screen 3 so as to directly collect the liquid phase screened by the vibrating screen 3. If two vibrating sieves 3 arranged side by side are adopted, the size of the liquid inlet of the liquid phase collecting part 6 is not less than the sum of the sizes of the lower part screens of the two vibrating sieves 3, namely, the liquid phases screened by the two vibrating sieves 3 can directly fall into the liquid inlet of the liquid phase collecting part 6.
The slurry pump 10 is driven by a motor, and the motor is connected with a PLC control through a signal line. The PLC controller realizes the control of starting and stopping the slurry pump 10 through the control of the motor, the slurry pump 10 and the motor are both installed on the slurry pump installation seat 9, the slurry pump installation seat 9 is fixed on the base 8, the liquid level sensor 4 is preferably an explosion-proof liquid level sensor 4, and the motor is preferably an explosion-proof motor. All install on base 8 through with above-mentioned each part, realized the modularization of device, integrated and intelligent design, be convenient for dismouting and transportation, simple structure, low cost.
The working principle of the invention is that the density proportion of the slurry is changed when the drilling depth is different in the normal drilling process, and the slurry density is generally required to be 1.0-2.4. When no sand leakage of shale shaker 3 normally operates, the proportion sensor in the liquid phase collection piece 6 of shale shaker 3 below predetermines 3.0g/cm thin heaven, and the total volume of liquid phase collection piece 6 is 3m thin heaven, and the flow of sediment stuff pump 10 is 20m thin heaven. The liquid phase after being screened by the vibrating screen 3 falls into the liquid phase collecting piece 6, the liquid phase after being naturally settled and screened is divided into upper clear liquid 13 and lower turbid liquid 12 in the liquid phase collecting piece 6, and the upper clear liquid 13 enters the next-stage flow through the clear liquid conveying groove 1. In order to prevent the density of the lower layer turbid liquid 12 from increasing gradually, the density of the lower layer turbid liquid 12 is always controlled within a preset value of 3.0g/cm, the slurry pump 10 is set to be started every 50min, the starting time is 10min, and the lower layer turbid liquid 12 is discharged to the feeding hole of the vibrating screen 3 through the slurry pump 10 and is recycled. When the vibrating screen 3 appears that the screen cloth is damaged or the sealing strip is sealed untight and leads to in mud leaks sand and gets into liquid phase collection piece 6, the density of the lower floor turbid liquid in the liquid phase collection piece 6 can increase rapidly, set for the density of lower floor turbid liquid 12 and exceed default 3.0g/cm year before sediment stuff pump 10, at this moment, proportion sensor 4 gives the mud density signal transmission who detects to the PLC controller, it stops to carry out the circulation that sediment stuff pump 10 stopped again after 10min through PLC controller control sediment stuff pump 10 control, and send simultaneously audible and visual alarm and remind relevant personnel to detect equipment such as screen cloth and sealing strip. It should be noted that, in the actual working process of the vibrating screen 3, parameters such as the start-stop time, the flow rate, the preset value of the specific gravity sensor 4, and the like of the slurry pump 10 need to be adjusted according to the on-site working conditions such as the liquid phase density, the liquid phase collecting member 6, and the like after being screened by the vibrating screen 3.
The screen sand leakage monitoring device provided by the invention is described in detail above. The technical principle and the implementation of the present invention are explained in the present document by applying specific examples, which are only used to help understanding the method and the core idea of the present invention. Meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. The utility model provides a screen cloth leaks sand monitoring devices, collects the piece including the liquid phase that is used for collecting the liquid phase after the shale shaker screening, its characterized in that: the liquid phase is naturally precipitated in the liquid phase collecting piece into upper clear liquid and lower turbid liquid, and the upper clear liquid is discharged to a lower flow through a clear liquid conveying groove;
the bottom of the liquid phase collecting part is provided with a turbid liquid outlet, the turbid liquid outlet is connected with a liquid inlet of a slurry pump through a turbid liquid suction manifold, and a liquid outlet of the slurry pump is connected with a feed inlet of a vibrating screen through a turbid liquid discharge manifold;
a specific gravity sensor for detecting the density of the turbid liquid at the lower layer is arranged in the liquid phase collecting part and is connected with a PLC (programmable logic controller) in the control cabinet through a signal line;
the PLC controls the start and stop of the slurry pump at regular time, so that the density of the lower layer turbid liquid is controlled within a preset value, and an alarm signal is sent out when the density of the lower layer turbid liquid exceeds the preset value.
2. A screen sand leakage monitoring device according to claim 1, wherein: the liquid phase collecting piece is of a V-shaped tank structure.
3. A screen sand leakage monitoring device according to claim 1, wherein: still include the base, install frame structure on the base, at least one shale shaker is installed at frame structure's top, the top of collecting the piece in the liquid phase is connected on the frame structure of shale shaker below, and the sediment stuff pump passes through the sediment stuff pump mount pad and installs on the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210154604.6A CN114526024A (en) | 2022-02-21 | 2022-02-21 | Screen cloth leaks sand monitoring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210154604.6A CN114526024A (en) | 2022-02-21 | 2022-02-21 | Screen cloth leaks sand monitoring devices |
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| Publication Number | Publication Date |
|---|---|
| CN114526024A true CN114526024A (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210154604.6A Pending CN114526024A (en) | 2022-02-21 | 2022-02-21 | Screen cloth leaks sand monitoring devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115487574A (en) * | 2022-09-20 | 2022-12-20 | 西南石油大学 | Screen mesh damage monitoring and alarming system and well drilling vibrating screen |
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| JP2014062880A (en) * | 2012-09-21 | 2014-04-10 | Takahiro Furuta | Screening mesh breakage detection device |
| CN104147937A (en) * | 2014-07-25 | 2014-11-19 | 清华大学 | Method for detecting completeness of filter membrane |
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| CN111389561A (en) * | 2020-04-14 | 2020-07-10 | 磐石自动化***（深圳）有限公司 | Circulating crushing system and control method |
| CN111453963A (en) * | 2020-05-12 | 2020-07-28 | 张劲南 | Self-adaptive vibration-rotation solid-liquid separator |
| CN215235855U (en) * | 2021-04-27 | 2021-12-21 | 湖北三宁矿业有限公司 | Unmanned on duty crushing screening detection device |
-
2022
- 2022-02-21 CN CN202210154604.6A patent/CN114526024A/en active Pending
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| CN104147937A (en) * | 2014-07-25 | 2014-11-19 | 清华大学 | Method for detecting completeness of filter membrane |
| CN109759225A (en) * | 2019-02-25 | 2019-05-17 | 中建四局第一建筑工程有限公司 | A kind of Punching Borehole Cast-in-place Concrete Pile mud circular treatment constructing structure |
| CN111389561A (en) * | 2020-04-14 | 2020-07-10 | 磐石自动化***（深圳）有限公司 | Circulating crushing system and control method |
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| CN115487574A (en) * | 2022-09-20 | 2022-12-20 | 西南石油大学 | Screen mesh damage monitoring and alarming system and well drilling vibrating screen |
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