CN112746822B - Drilling fluid mud negative pressure screening system - Google Patents
Drilling fluid mud negative pressure screening system Download PDFInfo
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- CN112746822B CN112746822B CN202110010475.9A CN202110010475A CN112746822B CN 112746822 B CN112746822 B CN 112746822B CN 202110010475 A CN202110010475 A CN 202110010475A CN 112746822 B CN112746822 B CN 112746822B
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- 238000005553 drilling Methods 0.000 title claims abstract description 54
- 239000012530 fluid Substances 0.000 title claims abstract description 53
- 238000012216 screening Methods 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 76
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000011010 flushing procedure Methods 0.000 claims abstract description 6
- 238000007790 scraping Methods 0.000 claims description 27
- 238000007789 sealing Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims 6
- 230000000694 effects Effects 0.000 abstract description 12
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 30
- 239000007790 solid phase Substances 0.000 description 26
- 230000009471 action Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000007872 degassing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Classifications
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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
- E21B21/06—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
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cyclones (AREA)
Abstract
The invention provides a drilling fluid mud negative pressure screening system, which relates to the technical field of drilling fluid treatment and comprises an annular filter belt and a first driving mechanism for driving the filter belt to rotate and vibrate in the circumferential direction, wherein a tensioning mechanism for tensioning a filter part of the filter belt is arranged on the filter belt, a liquid inlet mechanism is arranged above the filter part, a direct flushing prevention mechanism is arranged in the liquid inlet mechanism, a negative pressure hopper is arranged below the filter part, and the negative pressure hopper is sequentially connected with a solid-liquid separation device, a gas-liquid separation device and a negative pressure generation device. Solid-liquid separation equipment includes cyclone shell and the rotatory impeller that the clearance set up in cyclone shell, and rotatory impeller passes through its rotation of second actuating mechanism drive, and the below of rotatory impeller is provided with the deformation and scrapes mud mechanism, and the reducing portion can strut along with telescopic cylinder's extension and warp and scrape mud mechanism and drive the deformation and scrape mud mechanism and rotate. The problems of large occupied area and poor separation effect of drilling fluid solid-liquid separation equipment in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of drilling fluid treatment, in particular to a drilling fluid mud negative pressure screening system.
Background
The drilling fluid generated in the process of exploiting energy sources such as petroleum contains toxic and harmful components such as additives and the like, and can cause environmental pollution when directly discharged into the environment, such as polluted surface and underground water resources, heavy metals are retained in soil to influence the growth of plants and the reproduction of microorganisms, and meanwhile, the health of people and livestock is harmed due to the absorption and enrichment of plants, so the drilling fluid needs to be treated before being discharged so as to meet the requirement of environmental protection.
Prior art drilling fluid purification typically involves: the method comprises the following steps of screening large solid-phase particles by using a vibrating screen, enabling the screened drilling fluid to enter a sand settling bin, then sequentially flowing into a degassing bin, a desanding bin, a mud removing bin and a centrifuge bin, degassing the drilling fluid by a degasser in the degassing bin, removing the solid-phase particles with the particle size of 44-74 microns in the drilling fluid by the desander in the desanding bin, removing the solid-phase particles with the particle size of 15-44 microns in the drilling fluid in the mud removing bin, and removing the solid-phase particles with the particle size of 2-15 microns in the drilling fluid in the centrifuge bin, so that the drilling fluid is purified, and the purified drilling fluid can be pumped into a shaft again for utilization after being stored.
The drilling fluid after the shale shaker filters among the prior art needs can let the drilling fluid satisfy the purification requirement after multistage liquid-solid separation for the equipment that uses is more, and entire system area is big, is unfavorable for like the use of occasions that drilling platform is little such as offshore drilling, and the shale shaker among the prior art relies on the vibration of filter screen to carry out solid-liquid separation, and liquid forms the water film very easily on the filter screen and makes liquid can not pass the filter screen fully, has reduced screening efficiency and screening effect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a drilling fluid mud negative pressure screening system, which solves the problems of large occupied area and poor separation effect of drilling fluid solid-liquid separation equipment in the prior art.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the utility model provides a drilling fluid mud negative pressure screening system, it is including being annular filter belt and the first actuating mechanism that drives filter belt circumferential direction and vibration, is provided with the straining device that makes the filter house of filter belt tighten on the filter belt, and the top of filter house is provided with feed liquor mechanism, is provided with in the feed liquor mechanism and prevents directly towards the mechanism, and the below of filter house is provided with the negative pressure fill, and the negative pressure fill is connected with solid-liquid separation device, gas-liquid separation device and negative pressure production device in proper order.
The solid-liquid separation device comprises a cyclone shell and a rotating impeller arranged in the cyclone shell in a clearance mode, the rotating impeller is driven to rotate through a second driving mechanism, a deformation mud scraping mechanism is arranged below the rotating impeller, the lower end of a rotating shaft of the rotating impeller is connected with a diameter-variable portion through a telescopic cylinder, and the diameter-variable portion can stretch the deformation mud scraping mechanism along with the extension of the telescopic cylinder and drive the deformation mud scraping mechanism to rotate; the bottom of whirlwind shell is provided with the discharge valve, and the discharge valve links with the variable diameter portion.
The invention has the beneficial effects that:
1. the drilling fluid of mud shape is on the filter belt, for the negative pressure and the filter belt top is atmospheric pressure in the negative pressure fill of filter belt below, under the pressure differential effect, and except that the particle diameter is greater than the filter belt filtration pore stay in the filter belt top, other drilling fluids all can get into the negative pressure fill fully under the pressure effect in, combine the vibration effect of filter belt, can reach better separation effect.
2. The pivoted cassette makes the drilling fluid can not only erode the same place of cassette, can improve the life of cassette, and the cassette is at the rotation in-process, and the large granule material that is filtered can drop under the action of gravity along with the removal of cassette when the cassette turns, can clear the net to the non-filtering part (intermittent type portion) of cassette simultaneously and handle for clear net can not mutual interference with two processes of filtration, need not stop during the net of clearing just can be more thorough.
3. Under the action of airflow generating negative pressure, drilling fluid enters the cyclone shell from the tangential direction and rotates in the cyclone shell, solid substances such as solid phase particles in the drilling fluid are separated under the action of centrifugal force and gravity, and the solid phase particles are attached to the cyclone shell in a wet state and are accumulated to a certain amount, so that the mud removing effect is reduced. In the scheme, the rotary impeller driven to rotate by the second driving mechanism can increase the centrifugal force applied to the drilling fluid and improve the separation effect; when the inner wall of the cyclone shell needs to be scraped, the telescopic cylinder is controlled to extend downwards to prop open the deformation mud scraping mechanism through the reducing part along with downward movement, so that the deformation mud scraping mechanism which is originally spaced from the inner wall of the cyclone shell can contact with the attached solid-phase particles and rotate along with the rotary impeller to scrape the solid-phase particles attached to the middle part, the solid-phase particles attached to the upper part lose support and fall off, and the solid-phase particles attached to the lower part also fall off under the impact action of the solid-phase particles falling from the upper part; the discharge valve can be opened in step to the extension downwards of telescopic cylinder to outside the solid phase granule that guarantees to drop can in time drop the whirlwind shell, avoid the second to pile up, improve and scrape the mud effect. Therefore, the impeller driven to rotate by external force is additionally arranged in the cyclone shell to improve centrifugal force and timely remove solid-phase particles attached to the inner wall of the cyclone shell, so that the solid-liquid separation device can separate out 10-74 mu m solid-phase particles, equipment is simplified, and the separation effect of the solid-phase particles in the drilling fluid is improved.
Drawings
FIG. 1 is a schematic structural diagram of a drilling fluid mud negative pressure screening system.
Fig. 2 is a right side view of the belt of fig. 1.
Fig. 3 is a top view of the anti-direct-flushing mechanism in the liquid inlet mechanism in fig. 2.
FIG. 4 is a schematic structural diagram of the solid-liquid separation device in FIG. 1.
Fig. 5 is a perspective view of the bottom end structure of the rotating shaft in fig. 4.
Fig. 6 is a perspective view showing the structure of the outer sealing plate of fig. 4.
Wherein, 1, a filter belt; 101. a filtering part; 102. a batch section; 103. a winding part; 2. a first drive mechanism; 21. a driving wheel; 22. a driven wheel; 23. a tensioning mechanism; 3. a negative pressure hopper; 4. a liquid inlet mechanism; 41. a direct impact prevention mechanism; 5. a solid-liquid separation device; 51. a cyclone housing; 52. rotating the impeller; 521. a rotating shaft; 53. a second drive mechanism; 531. a drive motor; 532. a gear transmission mechanism; 54. a deformation mud scraping mechanism; 541. a boss portion; 542. a scraper section; 543. a tray; 544. a return spring; 545. a central sleeve; 546. spokes; 547. a circumferential limiting mechanism; 55. a telescopic cylinder; 551. a piston cavity; 552. a piston; 553. a power-assisted spring; 56. a diameter-variable part; 561. an inner seal plate; 562. an outer seal plate; 563. a sliding sleeve; 564. a chute; 565. a slider; 566. an airway; 567. a guide cylinder; 6. a gas-liquid separation device; 7. a negative pressure generating device; 8. a discharge valve; 81. a push rod; 82. a groove; 9. a net cleaning device; 10. a mud scraper; 11. and a mud storage bin.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1 to 6, the drilling fluid mud negative pressure screening system comprises an annular filter belt 1 and a first driving mechanism 2 for driving the filter belt 1 to rotate and vibrate in the circumferential direction, a tensioning mechanism 23 for tensioning a filtering part 101 of the filter belt 1 is arranged on the filter belt 1, a liquid inlet mechanism 4 is arranged above the filtering part 101, a straight flushing prevention mechanism 41 is arranged in the liquid inlet mechanism 4, a negative pressure hopper 3 is arranged below the filtering part 101, and the negative pressure hopper 3 is sequentially connected with a solid-liquid separation device 5, a gas-liquid separation device 6 and a negative pressure generation device 7.
The drilling cuttings containing the solid phase and the liquid phase are mechanically separated by utilizing negative pressure, chemicals required for maintaining the performance of the drilling fluid are reduced, the environment is protected, the performance of the drilling fluid is better maintained, and the subsequent recycling is facilitated. When the water-based mud is actually treated, the volume content of the mud in the separated drill cuttings can be reduced to below 40%; when oil-based mud is actually processed, the oil content (weight) can be reduced by 54% -69% relative to that of a common vibrating screen and reduced to 6% -8%. The average residence time of the drilling fluid to be separated on the screen surface of the filter belt 1 is only 5 seconds, and the time is greatly reduced compared with the 30 seconds of the traditional system, so that the treatment fluid amount in unit time can be obviously improved.
After negative pressure is introduced, a solid-liquid separation device 5 can be connected between the negative pressure generation device 7 and the filter belt 1, drilling fluid is driven to flow along a gas path by means of airflow, the cyclone shell 51 is processed into a structure similar to a cyclone dust collector, the cyclone shell 51 comprises a straight cylinder and a conical cylinder, the shape and the size of the cyclone shell 51 are designed according to the distribution of particle sizes in the drilling fluid and the requirement on centrifugal force, the airflow carrying the drilling fluid spirally descends in the cyclone shell 51 until being discharged from a liquid outlet, and in the descending process, solid-phase particles in the drilling fluid are thrown onto the inner wall of the cyclone shell 51 under the action of the centrifugal force.
The straight-flushing preventing mechanism 41 comprises a plurality of rollers which are arranged at the outlet of the liquid inlet mechanism 4 side by side, and a ceramic layer is fixed on the surface of each roller. After the drilling fluid is put down, the roller is firstly impacted, the impact force of the drilling fluid is buffered by the rotation of the roller, the impact on the filter belt 1 is relieved, and the service life of the filter belt 1 is prolonged. The ceramic layer has good wear resistance, and can prolong the service life of the roller.
The first driving mechanism 2 comprises a driving wheel 21 and a driven wheel 22 which are arranged in parallel, the filter belt 1 is wound on the driving wheel 21 and the driven wheel 22, and a vibrator is arranged in the driving wheel 21. The driving wheel 21 is a rotary vibrator, and the driving wheel 21 and the driven wheel 22 are both as long as the filter belt 1, and are used for expanding the filter belt 1 and driving the filter belt 1 to rotate circumferentially by friction force. The action wheel 21 passes through the motor drive and rotates, has the steel loop of many spray tubes in action wheel 21 inside, and the steel loop is extruded by the compressed air who lets in, thereby inside rotary motion forms centrifugal force and produces the vibration, and this vibration can form the microvibration on the filter belt 1, and the help is sieved the major diameter granule.
The filter unit 101 is a filter belt 1 above the driving pulley 21 and the driven pulley 22, the filter belt 1 located below the driving pulley 21 and the driven pulley 22 is an intermittent unit 102, and the tension mechanism 23 is a tension pulley around which the intermittent unit 102 is wound. A screen cleaning device 9 for performing high-pressure blowing in alignment with the intermittent part 102 is provided between the intermittent part 102 and the filter part 101.
The winding part 103 of the filter belt 1 is wound on the driving wheel 21 or the driven wheel 22, the winding part 103 far away from the liquid inlet mechanism 4 is provided with the mud scraper 10, and the mud scraper 10 is arranged on the machine shell. The mud scraper 10 is arc-shaped, so that the scraped solid-phase particles enter the mud storage bin 11 along the convex arc surface, and the mud storage bin 11 arranged below the mud scraper 10 is used for storing the solid-phase particles with large particle size filtered by the filter belt 1.
The solid-liquid separator 5 includes a cyclone casing 51 and a rotary impeller 52 provided in the cyclone casing 51 with a gap therebetween, and the rotary impeller 52 is driven to rotate by a second drive mechanism 53. The rotary impeller 52 is driven by the second driving mechanism 53 to rotate, and the blades agitate the airflow to generate a spiral airflow in the same direction as the spiral airflow generated by the cyclone shell 51, so that the centrifugal force applied to the solid-phase particles is further enhanced, and the separation effect is improved. (the rotating impeller 52 in the drawings is only a schematic diagram, and the shape and installation direction of the blades need to be designed according to the actual requirements according to the fluid mechanics principle).
The second driving mechanism 53 comprises a driving motor 531 and a gear transmission mechanism 532 which are arranged on the top plate of the cyclone shell 51, and the rotating direction of the rotary impeller 52 is the same as the cyclone direction formed by the drilling fluid entering the cyclone shell 51. The upper end of the rotating shaft 521 on which the rotary impeller 52 is mounted is a gear shaft, and the gear shaft is engaged with a driving gear mounted on the driving motor 531. The bearing has been cup jointed respectively to the both sides of gear shaft, and the bearing is installed in the bearing box. The gear transmission can bear the rotation of a large load, so that solid-phase particles are timely adhered to the impeller to increase the load, and the second driving mechanism 53 cannot be damaged. The upper end of the rotating shaft 521 is arranged in the bearing box, so that the rotating shaft 521 forms a cantilever shaft, and the mounting strength and the mechanical property of the cantilever shaft are improved.
The deformation mud scraping mechanism 54 is arranged below the rotary impeller 52, the lower end of the rotating shaft 521 of the rotary impeller 52 is connected with the diameter-variable part 56 through the telescopic cylinder 55, and the diameter-variable part 56 can expand the deformation mud scraping mechanism 54 along with the extension of the telescopic cylinder 55 and drive the deformation mud scraping mechanism 54 to rotate. When mud scraping is not needed, the deformed mud scraping mechanism 54 is folded to enable the space between the deformed mud scraping mechanism and the cyclone shell 51 to be larger, and drilling fluid and thrown solid-phase particles can pass through the deformed mud scraping mechanism conveniently. After solid-liquid separation for a period of time, the solid-phase particles attached to the inner wall of the housing increase to affect the separation effect, and the solid-phase particles on the inner wall of the housing need to be scraped, the piston rod in the telescopic cylinder 55 is controlled to extend to allow the diameter-variable portion 56 to move downwards until the piston rod is inserted into the deformation mud scraping mechanism 54 and props up the deformation mud scraping mechanism 54 to allow the scraper to contact the inner wall of the housing and synchronously rotate to scrape the attached solid-phase particles.
The telescopic cylinder 55 comprises a piston cavity 551 processed in the rotating shaft 521, the piston cavity 551 is arranged in the inner cavity of the rotating shaft 521, the structure of the whole device can be more compact, the number of parts forming the whole device is effectively reduced, the integration level is higher, and the cost is lower. The piston cavity 551 is hermetically separated into a first piston cavity and a second piston cavity by a piston 552 which is arranged in a sliding manner, and the first piston cavity and the second piston cavity are respectively communicated with an air charging and discharging pump. The charge and discharge pump is controlled to charge or discharge air into the first piston chamber and the second piston chamber to control a pressure difference between the first piston chamber and the second piston chamber, so that the piston 552 moves by the pressure difference.
The first piston cavity is arranged at the upper end of the piston 552, the second piston cavity is arranged at the lower end of the piston 552, the lower end of the second piston cavity is connected with the diameter-changing part 56 in a sliding and sealing way, the sliding sealing is realized by sequentially overlapping and connecting an inner sealing plate 561 and an outer sealing plate 562 which are arranged at the upper end of the diameter-changing part 56, a round table which is always inserted into the second piston cavity is integrally formed on the inner sealing plate 561, a sliding sleeve 563 which extends along the axial direction is fixed on the outer sealing plate 562, a plurality of sliding grooves 564 which are axially arranged along the rotating shaft 521 are processed on the outer wall of the lower end of the rotating shaft 521, a plurality of sliding blocks 565 which correspond to the sliding grooves 564 are fixed on the inner hole wall of the sliding sleeve 563, the sliding blocks 565 can slide up and down in the sliding grooves 564 but cannot rotate along the circumference, so that the diameter-changing part 56 can synchronously rotate along with the rotating shaft 521, also, radial vent holes are formed in the slide slots 564 and air passages 566 are formed in the inner seal plate 561 to communicate the vent holes with the second piston chamber.
The lower end of the piston 552 is fixedly connected with the reducing portion 56, the reducing portion 56 is in a circular truncated cone shape with a large upper end and a small lower end, and the inclination of the circular truncated cone is determined according to the size range of the spreading deformation mud scraping mechanism 54. A guide cylinder 567 is fixed to the lower end of the diameter-variable portion 56.
The deformed mud scraping mechanism 54 comprises a plurality of mud scraping sheets distributed at intervals along the circumference, each mud scraping sheet is independent from each other, intervals exist on the circumference, each mud scraping sheet comprises a shaft sleeve portion 541, a scraping blade portion 542 extending along the radial direction of the cyclone shell 51 is fixed on each shaft sleeve portion 541, and the lower end of each shaft sleeve portion 541 is slidably inserted into a guide groove formed in the bottom surface of the tray 543.
A return spring 544 is abutted between the shaft sleeve portion 541 and the side plate of the tray 543, the tray 543 is rotatably sleeved on the central sleeve 545, the central sleeve 545 is supported on the cyclone shell 51 through spokes 546, and a circumference limiting mechanism 547 is arranged between the inner wall of the shaft sleeve portion 541 and the guide cylinder 567. The circumference limiting mechanism 547 is engaged with the sliding block 565 and the sliding groove 564 to prevent the circumference from rotating relatively and to slide freely in the axial direction.
After the diameter-variable part 56 moves downwards, the guide cylinder 567 is inserted into the sleeve 541 and moves downwards continuously, the scraper moves towards the direction away from the center of the circle with the insertion of the large diameter on the diameter-variable part 56 until the diameter-variable part 56 is inserted completely, at this time, a small gap exists between the scraper 542 and the inner wall of the cyclone shell, and the scraper is driven to rotate synchronously under the action of the circumference limiting mechanism 547 to scrape the attached solid-phase particles.
The bottom of the cyclone shell 51 is provided with a discharge valve 8, and the discharge valve 8 is linked with the reducing part 56. A push rod 81 is fixed on the bottom surface of the diameter-variable part 56, a groove 82 for the insertion of the push rod 81 is arranged on the top surface of the discharge valve 8, the discharge valve 8 is inserted into the outlet end of the cyclone shell 51, the side wall of the discharge valve 8 is connected with the inner wall of the outlet of the cyclone shell 51 in a sliding and sealing manner, and the top end of the discharge valve 8 is elastically connected with the cyclone shell 51.
Claims (8)
1. The drilling fluid mud negative pressure screening system is characterized by comprising an annular filter belt (1) and a first driving mechanism (2) for driving the filter belt (1) to rotate circumferentially and vibrate, wherein a tensioning mechanism (23) for tensioning a filter part (101) of the filter belt (1) is arranged on the filter belt (1), a liquid inlet mechanism (4) is arranged above the filter part (101), a direct flushing preventing mechanism (41) is arranged in the liquid inlet mechanism (4), a negative pressure hopper (3) is arranged below the filter part (101), and the negative pressure hopper (3) is sequentially connected with a solid-liquid separation device (5), a gas-liquid separation device (6) and a negative pressure generation device (7);
the solid-liquid separation device (5) comprises a cyclone shell (51) and a rotating impeller (52) arranged in the cyclone shell (51) in a clearance mode, the rotating impeller (52) is driven to rotate through a second driving mechanism (53), a deformation sludge scraping mechanism (54) is arranged below the rotating impeller (52), the lower end of a rotating shaft (521) of the rotating impeller (52) is connected with a diameter-variable portion (56) through a telescopic cylinder (55), and the diameter-variable portion (56) can support the deformation sludge scraping mechanism (54) along with the extension of the telescopic cylinder (55) and drive the deformation sludge scraping mechanism (54) to rotate; a discharge valve (8) is arranged at the bottom end of the cyclone shell (51), and the discharge valve (8) is linked with the variable-diameter part (56);
the straight-flushing preventing mechanism (41) comprises a plurality of rollers arranged at the outlet of the liquid inlet mechanism (4) side by side, and a ceramic layer is fixed on the surface of each roller.
2. The drilling fluid mud negative pressure screening system of claim 1, characterized in that the first driving mechanism (2) comprises a driving wheel (21) and a driven wheel (22) which are arranged in parallel, the filter belt (1) is wound on the driving wheel (21) and the driven wheel (22), a vibrator is arranged in the driving wheel (21), the filter part (101) is the filter belt (1) above the driving wheel (21) and the driven wheel (22), the filter belt (1) below the driving wheel (21) and the driven wheel (22) is an intermittent part (102), and the tensioning mechanism (23) is a tensioning wheel for winding the intermittent part (102).
3. The drilling fluid mud negative pressure screening system of claim 2, characterized in that a screen cleaning device (9) which is aligned with the intermittent part (102) for high pressure blowing is arranged between the intermittent part (102) and the filtering part (101).
4. The drilling fluid mud negative pressure screening system of claim 2, characterized in that the wrapping part (103) of the filter belt (1) is wrapped on the driving wheel (21) or the driven wheel (22), a mud scraper (10) is arranged at the wrapping part (103) far away from the liquid inlet mechanism (4), the mud scraper (10) is arc-shaped, and a mud storage bin (11) is arranged below the mud scraper (10).
5. The drilling fluid mud negative pressure screening system of claim 1, characterized in that the second drive mechanism (53) comprises a drive motor (531) and a gear transmission mechanism (532) mounted on the top plate of the cyclone housing (51), and the rotation direction of the rotary impeller (52) is the same as the cyclone direction formed by the drilling fluid entering the cyclone housing (51).
6. The drilling fluid mud negative pressure screening system of claim 1, characterized in that, telescopic cylinder (55) includes piston chamber (551) that sets up in pivot (521), piston chamber (551) is separated into first piston chamber and second piston chamber through piston (552) that slide setting, first piston chamber and second piston chamber communicate with charge and discharge pump respectively, the lower extreme of piston (552) with become footpath (56) fixed connection, become footpath (56) with piston chamber (551) sliding seal connects.
7. The drilling fluid mud negative pressure screening system of claim 1, wherein the deformation sludge scraping mechanism (54) comprises a plurality of sludge scraping sheets distributed at intervals along the circumference, each sludge scraping sheet is provided with a shaft sleeve portion (541), the shaft sleeve portion (541) is fixed with a scraper portion (542) extending along the radial direction of the cyclone shell (51), a return spring (544) is abutted between the shaft sleeve portion (541) and a side plate of a tray (543), the tray (543) is rotatably sleeved on a central sleeve (545), the central sleeve (545) is supported on the cyclone shell (51) through spokes (546), and a circumference limiting mechanism (547) is arranged between the inner wall of the shaft sleeve portion (541) and the diameter changing portion (56).
8. The drilling fluid mud negative pressure screening system of claim 1, characterized in that a push rod (81) is fixed on the bottom surface of the diameter-variable part (56), a groove (82) for the insertion of the push rod (81) is arranged on the top surface of the discharge valve (8), the discharge valve (8) is inserted into the outlet end of the cyclone shell (51), the side wall of the discharge valve (8) is connected with the inner wall of the outlet of the cyclone shell (51) in a sliding and sealing manner, and the top end of the discharge valve (8) is elastically connected with the cyclone shell (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010475.9A CN112746822B (en) | 2021-01-06 | 2021-01-06 | Drilling fluid mud negative pressure screening system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010475.9A CN112746822B (en) | 2021-01-06 | 2021-01-06 | Drilling fluid mud negative pressure screening system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112746822A CN112746822A (en) | 2021-05-04 |
| CN112746822B true CN112746822B (en) | 2021-09-07 |
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| CN115804982A (en) * | 2022-12-29 | 2023-03-17 | 四川轻化工大学 | Low-noise solid-liquid separation vibrating screen |
| CN116752917B (en) * | 2023-08-17 | 2023-12-19 | 河南中正石油起重机械有限公司 | Negative pressure shale shaker for well drilling |
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| WO2013040678A1 (en) * | 2011-09-19 | 2013-03-28 | Daniel Guy Pomerleau | Three-phase separation system for drilling fluids and drill cuttings |
| CN104028025B (en) * | 2014-06-23 | 2016-11-23 | 南宁远卓新能源科技有限公司 | A kind of belt negative pressure filtration device |
| CN105370228B (en) * | 2015-08-27 | 2019-01-11 | 北京华油兴业能源技术有限公司 | Mud does not land intelligent environment protection integration well drilling solid control system |
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