Continuous purification treatment device for drilling fluid waste liquid

Abstract

The invention discloses a drilling fluid waste liquid continuous purification treatment device which comprises a drilling cutting screening mechanism with a first solid material discharge port, a second solid material discharge port and a liquid discharge port, the inlet end of a drilling cutting discharge component is communicated with the first solid material discharge port, the inlet end of an extrusion type dehydration mechanism is communicated with the second solid material discharge port, and the outlet end of the extrusion type dehydration mechanism is communicated with the liquid discharge port. The inlet end of the multi-stage drawer type purification mechanism is communicated with the liquid outlet, and an adjustable material stirring mechanism is arranged at the inlet end of the drilling cutting screening mechanism. According to the invention, the investment cost of equipment can be effectively reduced, the convenience of transportation, transfer, installation, maintenance and the like is improved, solids and harmful substances in waste liquid can be removed step by step, so that the whole purification treatment process is in a continuous state, the purification treatment efficiency is improved, the solids and harmful substances are harmlessly treated according to requirements, and the environmental pollution is reduced. And the condition of environmental pollution is avoided. The method is suitable for the technical field of drilling fluid waste liquid in well drilling.

Description

Technical Field

[0001] The present invention belongs to the technical field of treating pollutants generated by drilling. Specifically, it relates to a continuous purification treatment device for drilling fluid waste liquid. Background Art

[0002] Drilling fluid plays key roles such as lubricating the drill bit, carrying cuttings, stabilizing the wellbore, and balancing formation pressure during the drilling of oil and natural gas. However, during use, the drilling fluid will gradually fail due to mechanical action, chemical reactions, and formation contamination, and finally become drilling fluid waste liquid. Moreover, since the drilling fluid carries drill cuttings back to the surface, even after separation by a vibrating screen, a large amount of fine particles (particle size < 50 μm) still remain, resulting in an increase in the solid content of the drilling fluid. And the high-solid-content waste slurry discharged from equipment such as desanders, desilters, and centrifuges will contaminate the drilling fluid. The existing treatment method is to remove the drill cuttings in the drilling fluid waste liquid by screening or filtering. After that, the separated solid phase and liquid phase are separately treated. Generally, a filter press is used to perform a pressure filtration operation on the solid phase to completely dehydrate the solid phase, and the liquid filtered out is recovered and mixed with the above-mentioned liquid phase; then, an evaporation crystallization device, a membrane separation device, or an activated carbon adsorption device is used to separate the residual substances in the liquid phase. It can be seen that purifying the drilling fluid waste liquid requires multiple processes and supporting purification equipment, which increases the cost of equipment investment, is not convenient for operations such as transportation, installation, and maintenance, is weak in portability and mobility, increases the costs of transportation, installation, and maintenance. Moreover, the continuity of treating the drilling fluid waste liquid is poor, and the treatment efficiency is low. And the interception rate of ultra-fine particles (particle size < 5 μm) by a vibrating screen or centrifuge is low, which aggravates the subsequent membrane pollution. At the same time, the moisture content of the sludge after dehydration is still relatively high (50 - 60%), increasing the costs of transportation and disposal. Summary of the Invention

[0003] The present invention provides a continuous purification treatment device for drilling fluid waste liquid to reduce the equipment investment cost, improve the convenience of transportation, transfer, installation, maintenance, etc., and can gradually remove solids and harmful substances in the waste liquid, making the entire purification treatment process in a continuous state, improving the purification treatment efficiency, and harmlessly treating solids and harmful substances according to requirements to avoid environmental pollution.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows: A continuous purification treatment device for drilling fluid waste liquid, comprising a drill cuttings screening mechanism having a first solid material discharge port, a second solid material discharge port and a liquid discharge port, the inlet end of the drill cuttings discharge member is communicated with the first solid material discharge port, the inlet end of the extrusion dehydration mechanism is communicated with the second solid material discharge port, the inlet end of the multi-stage drawer type purification mechanism is communicated with the liquid discharge port, and an adjustable feeding mechanism is arranged at the inlet end of the drill cuttings screening mechanism.

[0005] Further, the drill cuttings screening mechanism includes a vertical liquid guide pipe coaxially arranged in a vertical conveying cylinder, a mesh screening disc is connected to the upper end of the vertical liquid guide pipe, the first solid material discharge port is formed at the upper end of the vertical conveying cylinder and is located at the edge of the mesh screening disc, the lower end of the adjustable feeding mechanism is close to the upper end surface of the mesh screening disc, and a plurality of liquid guide holes are formed in the vertical liquid guide pipe.

[0006] Further, a first extrusion blade spirally extending along its axis is constructed outside the vertical liquid guide pipe, the lower end of the vertical liquid guide pipe extends out of the lower end of the vertical conveying cylinder, and the vertical liquid guide pipe is rotatably connected with the vertical conveying cylinder. A first transmission wheel is coaxially assembled at the lower end of the vertical liquid guide pipe. An extrusion pipe is constructed at the lower end of the vertical conveying cylinder, the second solid material discharge port is formed at the inlet end of the extrusion pipe, and a first control valve is installed on the extrusion pipe.

[0007] Further, the upper end of the vertical liquid guide pipe is inserted into the central part of the mesh screening disc, and the vertical liquid guide pipe and the mesh screening disc are connected by an adjusting screw. A screening retaining strip extending along the shape of a spiral is constructed on the upper end surface of the mesh screening disc.

[0008] Further, the adjustable feeding mechanism includes a mounting plate detachably connected to the upper end of the drill cuttings screening mechanism. The mounting plate extends from the outside of the drill cuttings screening mechanism to the center of the drill cuttings screening mechanism. A strip-shaped assembly hole extending along its length is formed in the mounting plate. A plurality of vertical adjusting rods are installed at intervals along the length direction of the mounting plate through the strip-shaped assembly hole. A feeding head is constructed at the lower end of each vertical adjusting rod, and the feeding head is close to or in contact with the screening surface of the drill cuttings screening mechanism.

[0009] Further, the multi-stage drawer type purification mechanism includes a vertical cabinet body having a liquid inlet joint and a liquid outlet joint respectively constructed at the upper and lower ends. A plurality of drawer type purification units are installed at intervals in the vertical direction in the vertical cabinet body. The impurities doped in the liquid are filtered by these drawer type purification units step by step from large to small according to the particle size. The liquid inlet joint is communicated with the liquid discharge port, and the liquid outlet joint is communicated with the inlet end of a pressure water pump.

[0010] Furthermore, the drawer-type purification unit includes a drawer-type body that can be detachably assembled in a vertical cabinet, an assembly seat is assembled in the drawer-type body, a plurality of filter cartridges are installed on the assembly seat at intervals, the upper end of each filter cartridge is in an open state, the lower end of the filter cartridge is closed, and a filter net is installed at the lower end of the drawer-type body.

[0011] Furthermore, the radial length of the filter cartridge decreases downward in the vertical direction, forming a conductive liquid cavity between the filter cartridge and the inner cavity of the drawer-type body, a backwash branch pipe is connected to the drawer-type body, a backwash control valve is installed on each backwash branch pipe, and the backwash branch pipe is connected to the backwash main pipe.

[0012] Furthermore, the extrusion dehydration mechanism includes a feed cylinder, an extrusion cylinder and a discharge cylinder which are coaxially arranged and connected in sequence, a liquid collecting cylinder is coaxially sleeved outside the extrusion cylinder, the extrusion cylinder is covered with extrusion holes, a drive rod is coaxially arranged in the extrusion cylinder, and both ends of the drive rod extend out of the feed cylinder and the discharge cylinder respectively, a second transmission wheel is coaxially mounted on the drive rod, and a second extrusion blade is spirally extended along its axis on the drive rod.

[0013] Furthermore, the pitch of the second extrusion blade decreases from the feed cylinder toward the discharge cylinder; a plurality of extrusion ports are provided at one end of the discharge cylinder away from the feed cylinder, an elastic opening and closing component is constructed between the discharge cylinder and the liquid collecting cylinder, and the elastic opening and closing component elastically closes each extrusion port.

[0014] Due to the adoption of the above structure, the technical progress achieved by the present invention compared with the prior art lies in that: by controlling the operation of the drill cuttings screening and separating mechanism, primary screening is completed. The drilling fluid waste liquid carrying drill cuttings enters from the inlet end of the drill cuttings screening and separating mechanism. The drill cuttings screening and separating mechanism screens out the drill cuttings with large particle sizes, enabling this part of the drill cuttings to enter the drill cuttings discharging component through the first solid material discharge port and then collecting the drill cuttings in the stirring kettle. Moreover, since the adjustable material distributing mechanism directly acts at the screening interface, it promotes the rapid screening out of the drill cuttings. The drilling fluid waste liquid after screening undergoes secondary screening at the lower end of the drill cuttings screening and separating mechanism. The separated impurities in the form of sludge enter the extrusion dehydration mechanism for dehydration treatment, and the obtained solid waste is also collected in the stirring kettle. Subsequently, cement or lime is added to the stirring kettle, and an appropriate amount of water is injected for stirring operation, so that the heavy metals in the drill cuttings and other solid impurities are solidified, thus meeting the requirements of landfill in "GB18598 - 2019". The liquids discharged from the drill cuttings screening and separating mechanism and the extrusion dehydration mechanism both enter the multi-stage drawer-type purification mechanism. The multi-stage drawer-type purification mechanism makes the liquid fully purified through filtration, activated carbon adsorption, and membrane adsorption, and finally reaches the discharge standard or the standard for recycling and reuse. In summary, the present invention can effectively reduce the equipment input cost, improve the convenience of transportation, transfer, installation, maintenance, etc., and can gradually remove the solids and harmful substances in the waste liquid, making the entire purification treatment process continuous, improving the purification treatment efficiency, and harmlessly treating the solids and harmful substances according to requirements, avoiding environmental pollution situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0016] In the drawings: Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic structural diagram of the corresponding setting of the drill cuttings screening and separating mechanism, the drill cuttings discharging component, and the adjustable material distributing mechanism in an embodiment of the present invention; Figure 3 is Figure 2 an axial sectional view of the shown structure; Figure 4 is a schematic structural diagram of the vertical conveying cylinder in the drill cuttings screening and separating mechanism of an embodiment of the present invention; Figure 5 is a schematic structural diagram of the separated vertical liquid guiding pipe and the mesh screening plate in the drill cuttings screening and separating mechanism of an embodiment of the present invention; Figure 6 is Figure 5 a schematic diagram of the shown structure from another angle; Figure 7 Schematic structural diagram of the adjustable material feeding mechanism according to an embodiment of the present invention; Figure 8 Schematic structural diagram of the drill cuttings discharging component according to an embodiment of the present invention; Figure 9 Schematic structural diagram of the corresponding arrangement of two multi-stage drawer-type purification mechanisms according to an embodiment of the present invention; Figure 10 is Figure 9 Schematic diagram of the structure shown from another angle; Figure 11 Schematic structural diagram of the drawer-type purification unit in the multi-stage drawer-type purification mechanism according to an embodiment of the present invention; Figure 12 Cross-sectional view of the structure of the drawer-type purification unit in the multi-stage drawer-type purification mechanism according to an embodiment of the present invention; Figure 13 Schematic structural diagram of the vertical cabinet in the drawer-type purification unit according to an embodiment of the present invention; Figure 14 Schematic structural diagram of the structure after removing the vertical cabinet in the drawer-type purification unit according to an embodiment of the present invention; Figure 15 Schematic structural diagram of the extrusion type dehydration mechanism according to an embodiment of the present invention; Figure 16 Axial cross-sectional view of the extrusion type dehydration mechanism according to an embodiment of the present invention; Figure 17 Schematic structural diagram of the connection of the elastic opening and closing component, the discharge cylinder body and the liquid collecting cylinder body in the extrusion type dehydration mechanism according to an embodiment of the present invention; Figure 18 Partial structural diagram of the extrusion type dehydration mechanism after removing the elastic opening and closing component according to an embodiment of the present invention; Figure 19 Schematic structural diagram of the elastic opening and closing component in the extrusion type dehydration mechanism according to an embodiment of the present invention.

[0017] Labeled parts: 100-drill cuttings screening mechanism, 101-vertical conveying cylinder, 102-transition cylinder, 103-splash-proof edge, 104-blocking edge, 105-drill cuttings discharge port, 106-extrusion pipe, 107-first control valve, 108-mesh screening plate, 109-screening baffle bar, 110-transfer edge, 111-vertical sleeve, 112-guide bar, 113-adjusting screw, 114-vertical liquid guide pipe, 115-first extrusion blade, 116-guide groove, 117-first transmission wheel, 200-adjustable material dispensing mechanism, 201-mounting plate, 202-fixing ear, 203-strip assembly hole, 204-vertical adjustment rod, 205-dispensing head, 206-fastening nut, 300-drilling chip discharge component, 301-chip discharge guide cylinder, 302-chip discharge channel, 303-chip feed port, 400-connecting pipe system, 401-first pipe body, 402-adapter, 403-second pipe body, 404-third pipe body, 405-second control valve, 500-multi-stage drawer-type purification mechanism , 501-vertical cabinet, 502-liquid inlet joint, 503-liquid inlet control valve, 504-liquid outlet joint, 505-liquid outlet control valve, 506-drawer type purification unit, 5061-drawer type body, 5062-assembly seat, 5063-filter cartridge, 5064-conducting liquid cavity, 5065-filter net, 5066-conducting joint, 5067-connecting ear, 5068-push-pull handle, 5069-installation slide rail, 507-backwash branch pipe, 508-backwash control valve, 5 09-backwash main pipe, 600-extrusion dehydration mechanism, 601-feeding cylinder, 602-extrusion cylinder, 603-discharge cylinder, 604-liquid collecting cylinder, 605-driving rod, 606-second extrusion blade, 607-second transmission wheel, 608-feeding pipe, 609-extrusion port, 610-assembly ear, 611-mounting seat, 612-opening and closing sleeve, 613-discharge notch, 614-hard spring, 615-spring seat, 616-adjusting bolt, 617-locking nut. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] The present invention discloses a drilling fluid waste liquid continuous purification treatment device, such as Figure 1-19As shown in the figure, it includes a drilling cuttings screening mechanism 100, a drilling cuttings discharging component 300, an extrusion type dewatering mechanism 600, a multi-stage drawer type purification mechanism 500 and an adjustable material feeding mechanism 200. Among them, the drilling cuttings screening mechanism 100 has a first solid material discharge port, a second solid material discharge port and a liquid discharge port. The inlet end of the drilling cuttings discharging component 300 is communicated with the first solid material discharge port. The inlet end of the extrusion type dewatering mechanism 600 is communicated with the second solid material discharge port. The inlet end of the multi-stage drawer type purification mechanism 500 is communicated with the liquid discharge port. The adjustable material feeding mechanism 200 is arranged at the inlet end of the drilling cuttings screening mechanism 100. The working principle and advantages of the present invention are as follows: By controlling the action of the drilling cuttings screening mechanism 100, primary screening is completed. The drilling fluid waste liquid carrying drilling cuttings enters from the inlet end of the drilling cuttings screening mechanism 100. The drilling cuttings screening mechanism 100 screens out large particle size drilling cuttings, so that this part of the drilling cuttings enters the drilling cuttings discharging component 300 through the first solid material discharge port, and then the drilling cuttings are collected in the stirring kettle. Moreover, since the adjustable material feeding mechanism 200 directly acts at the screening interface, the drilling cuttings are quickly screened out. The drilling fluid waste liquid after screening is subjected to secondary screening at the lower end of the drilling cuttings screening mechanism 100. The separated impurities in the form of sludge enter the extrusion type dewatering mechanism 600 for dewatering treatment, and the obtained solid waste is also collected in the stirring kettle. Then, cement or lime is added into the stirring kettle, and an appropriate amount of water is injected for stirring operation, so that the heavy metals in the drilling cuttings and other solid impurities are solidified, thus meeting the requirements of landfill in "GB 18598-2019". The liquids discharged from the drilling cuttings screening mechanism 100 and the extrusion type dewatering mechanism 600 all enter the multi-stage drawer type purification mechanism 500. The multi-stage drawer type purification mechanism 500 makes the liquid be fully purified through filtration, activated carbon adsorption and membrane adsorption, and finally reaches the discharge standard or the standard for recycling and reuse. To sum up, the present invention can effectively reduce the equipment investment cost, improve the convenience of transportation, transfer, installation, maintenance, etc., and can gradually remove the solids and harmful substances in the waste liquid, so that the whole purification treatment process is in a continuous state, improve the purification treatment efficiency, and harmlessly treat the solids and harmful substances according to the requirements, avoiding environmental pollution.

[0020] As a preferred embodiment of the present invention, as Figure 2-6As shown, the cuttings screening mechanism 100 includes a vertical conveying cylinder 101, a vertical liquid guide pipe 114 and a mesh screening plate 108, the axes of the three coincide, and the above-mentioned liquid discharge port is formed at the lower end of the vertical liquid guide pipe 114. The vertical liquid guide pipe 114 is arranged in the vertical conveying cylinder 101, and a transition cylinder 102 is constructed at the upper end of the vertical conveying cylinder 101. The radial length of the transition cylinder 102 gradually expands upward along the vertical direction, and a splash-proof edge 103 is constructed at the upper end (large diameter end) of the transition cylinder 102. The cuttings discharge member 300 of this embodiment is installed at the splash-proof edge 103, and a cuttings discharge port 105 is opened on the splash-proof edge 103. The cuttings discharge port 105 is connected to the feed port of the cuttings discharge member 300, and the cuttings discharge port 105 is the above-mentioned first solid material discharge port. A blocking edge 104 is constructed at the connection between the splash-proof edge 103 and the transition tube 102 and on the inner wall of the transition tube 102, and an annular groove is formed between the blocking edge 104 and the upper end of the transition tube 102. A transfer edge 110 is constructed at the outer edge of the mesh sub-screening plate 108, and the transfer edge 110 is coaxially assembled in the annular groove, and the transfer edge 110 is rotatably connected to the transition tube 102 and the blocking edge 104 respectively. The lower end of the mesh sub-screening plate 108 is connected to the upper end of the vertical liquid guide pipe 114, and the lower end of the adjustable material-dispensing mechanism 200 is close to or in contact with the upper end surface of the mesh sub-screening plate 108. A plurality of liquid guide holes are provided on the vertical liquid guide pipe 114, and the mesh sub-screening plate 108 gradually bulges upward from its outer edge to its center. The drill cuttings pass through the mesh screen plate 108 along with the drilling fluid waste liquid, and the mesh screen plate 108 screens out the drill cuttings with larger particle sizes. Due to the design of the mesh screen plate 108 with a high middle and low outer edge, the drill cuttings gradually move to the splash-proof edge 103, and gradually enter the drill cutting discharge member 300 through the drill cutting discharge port 105 under the action of the adjustable material feeding mechanism 200. In this embodiment, by sucking the lower end of the vertical liquid guide pipe 114, the liquid entering the vertical conveying cylinder 101 enters the vertical liquid guide pipe 114 through the liquid guide hole, and the drill cuttings with small particle sizes are trapped in the vertical conveying cylinder 101. In order to improve the smooth downward transportation of the drill cuttings trapped in the vertical conveying cylinder 101 to the second solid material discharge port, and to squeeze this part of the drill cuttings to achieve primary dehydration of the drill cuttings, the measures taken in this embodiment are as follows: a first squeezing blade 115 is constructed outside the vertical liquid guide pipe 114, and the first squeezing blade 115 spirally extends along the axis of the vertical liquid guide pipe 114. The lower end of the vertical liquid guide pipe 114 extends from the lower end of the vertical conveying cylinder 101, and the vertical liquid guide pipe 114 is rotatably connected to the vertical conveying cylinder 101, and a first transmission wheel 117 is coaxially mounted at the lower end of the vertical liquid guide pipe 114. In this embodiment, an extrusion pipe 106 is constructed at the lower end of the vertical conveying cylinder 101, and the second solid material discharge port is formed at the inlet end of the extrusion pipe 106, and a first control valve 107 is installed on the extrusion pipe 106.The working principle of this embodiment is as follows: In this embodiment, by driving the first transmission wheel 117 to rotate, the vertical liquid guide pipe 114 is driven to rotate; during the rotation of the vertical liquid guide pipe 114, the mesh sieve plate 108 and the first extrusion blade 115 are driven to rotate. In this way, under the rotation of the mesh sieve plate 108, the drill cuttings screened out thereon gradually move towards the outer edge of the mesh sieve plate 108, and then, with the cooperation of the adjustable material feeding mechanism 200, the drill cuttings quickly enter the drill cuttings discharge component 300. At the same time, after the liquid entering the vertical conveying cylinder 101 is pumped away by the vertical liquid guide pipe 114, the remaining drill cuttings and other impurities are continuously conveyed downward by the first extrusion blade 115. During this process, the first control valve 107 is in a closed state. In this way, the drill cuttings and other impurities are gradually conveyed downward and continuously extruded to achieve the purpose of primary dehydration, and the extruded moisture is pumped away through the vertical liquid guide pipe 114. When the pumping effect of the vertical liquid guide pipe 114 on the liquid becomes poor, it proves that there are too many solid impurities in the vertical conveying cylinder 101. At this time, the first control valve 107 is opened, and at the same time, the first transmission wheel 117 is driven to rotate, so that the first extrusion blade 115 extrudes the solid impurities in the vertical conveying cylinder 101 through the extrusion pipe 106. When a certain degree of extrusion is reached (the vertical liquid guide pipe 114 can smoothly perform the liquid suction operation), and at the same time the water content of the solid impurities extruded by the extrusion pipe 106 increases, the first control valve 107 is closed. The first control valve 107 of this embodiment is an electromagnetic valve. In order to facilitate the mesh sieve plate 108 to smoothly screen the drill cuttings further, the measure taken in this embodiment is that the upper end of the vertical liquid guide pipe 114 is inserted into the central part of the mesh sieve plate 108. Specifically, a vertical sleeve 111 is constructed at the center of the lower end face of the mesh sieve plate 108, and two guiding strips 112 are symmetrically constructed on the inner peripheral wall of the vertical sleeve 111, and each guiding strip 112 extends in the vertical direction; two guiding grooves 116 are opened at the upper end of the vertical liquid guide pipe 114, and each guiding groove 116 extends in the vertical direction. The upper end of the vertical liquid guide pipe 114 is movably inserted into the vertical sleeve 111, and the guiding strip 112 is movably inserted into the corresponding guiding groove 116. An adjusting screw 113 is rotatably connected at the center of the mesh sieve plate 108, and the adjusting screw 113 is arranged in the vertical direction. The adjusting screw 113 extends into the vertical liquid guide pipe 114 from the upper end of the vertical liquid guide pipe 114, and the adjusting screw 113 is threadedly connected to the upper end of the vertical liquid guide pipe 114. In this embodiment, by rotating the adjusting screw 113, the middle part of the mesh sieve plate 108 is driven to move in the vertical direction. The mesh sieve plate 108 of this embodiment is a metal mesh structure and has certain elastic properties. In this way, the taper of the mesh sieve plate 108 changes, and then the drill cuttings are promoted to quickly move towards the outer edge of the mesh sieve plate 108.Moreover, in this embodiment, a screening barrier strip 109 extending along the shape of a spiral is constructed on the upper end surface of the mesh screening disc 108. During the rotation of the screening barrier strip 109 along with the mesh screening disc 108, the drill cuttings move along the channel in the shape of a spiral formed by the screening barrier strip 109, promoting the orderly movement of the drill cuttings and avoiding the situation where the drill cuttings move too fast on the mesh screening disc 108 and bounce and splash at the splash-proof edge 103.

[0021] As a preferred embodiment of the present invention, as Figure 7 shown, the adjustable material pushing mechanism 200 includes a mounting plate 201 and a plurality of vertical adjusting rods 204. Among them, a fixing ear 202 is constructed at one end of the mounting plate 201. The fixing ear 202 is detachably connected to the splash-proof edge 103. The mounting plate 201 extends from the outside of the drill cuttings screening mechanism 100 to the center of the drill cuttings screening mechanism 100. A strip-shaped assembly hole 203 is opened on the mounting plate 201. The strip-shaped assembly hole 203 extends along the length direction of the mounting plate 201. The above-mentioned plurality of vertical adjusting rods 204 are installed on the mounting plate 201 at intervals, and these vertical adjusting rods 204 are arranged at intervals along the length direction of the mounting plate 201 at the strip-shaped assembly hole 203. Each vertical adjusting rod 204 passes through the strip-shaped assembly hole 203 in the vertical direction. Two fastening nuts 206 are threadedly connected to the vertical adjusting rod 204. These two fastening nuts 206 are tightened on the upper and lower end surfaces of the mounting plate 201, thereby achieving the purpose of fixing the position of the vertical adjusting rod 204 and the mounting plate 201. In this embodiment, a material pushing head 205 is constructed at the lower end of each vertical adjusting rod 204. The material pushing head 205 is close to or in contact with the screening surface (the upper end surface of the mesh screening disc 108) of the drill cuttings screening mechanism 100. During the rotation of the mesh screening disc 108 driven, the material pushing head 205 scrapes the drill cuttings on the screening surface, avoiding the accumulation of drill cuttings and blocking the mesh screening disc 108. Moreover, since the mesh screening disc 108 is constructed with a screening barrier strip 109, during the rotation of the mesh screening disc 108 driving the screening barrier strip 109, due to the screening barrier strip 109 being in the shape of a spiral, the material pushing head 205 and the screening barrier strip 109 will collide frequently, thereby causing the mesh screening disc 108 to vibrate and improving the screening effect. And during the collision process, the mesh screening disc 108 will undergo a certain elastic deformation, thereby facilitating the separation of the material pushing head 205 and the screening barrier strip 109 and facilitating the next collision.

[0022] As a preferred embodiment of the present invention, as Figure 8As shown, the drill cuttings discharge member 300 includes a chip discharge guide tube 301. A chip discharge channel 302 is formed within the chip discharge guide tube 301. Moreover, the lower end of the chip discharge channel 302 inclines outward and is collected by a collection trough, so as to provide raw materials for a subsequent stirring kettle. An inlet 303 for cuttings is formed at the upper part of the chip discharge guide tube 301 and at one end facing the splash guard edge 103. The inlet 303 for cuttings communicates with the drill cuttings discharge port 105. The drill cuttings screened by the mesh sieve plate 108 enter into the inlet 303 for cuttings through the drill cuttings discharge port 105, and then enter into the collection trough through the chip discharge channel 302.

[0023] As a preferred embodiment of the present invention, as Figure 9 , 10 shown, the multi-stage drawer type purification mechanism 500 includes a vertical cabinet 501 and a plurality of drawer type purification units 506. A liquid inlet joint 502 is constructed at the upper end of the vertical cabinet 501. A liquid inlet control valve 503 is installed on the liquid inlet joint 502. A liquid outlet joint 504 is constructed at the lower end of the vertical cabinet 501. A liquid outlet control valve 505 is installed on the liquid outlet joint 504. The above-mentioned plurality of drawer type purification units 506 are installed at intervals in the vertical cabinet 501 along the vertical direction. The impurities doped in the liquid are filtered step by step by these drawer type purification units 506 according to the size of the particle diameter from large to small. Moreover, the liquid inlet joint 502 communicates with the liquid discharge port, and the liquid outlet joint 504 communicates with the inlet end of a pressure water pump. The liquid discharged from the drill cuttings screening mechanism 100 and the extrusion type dewatering mechanism 600 enters into the vertical cabinet 501 through the liquid inlet joint 502, and then successively passes through each drawer type purification unit 506 from top to bottom. The impurities in the liquid are filtered and purified in a progressive manner, and the finally obtained purified liquid is discharged through the liquid outlet joint 504. In this embodiment, since the multi-stage drawer type purification mechanism 500 is composed of a plurality of drawer type purification units 506, it is convenient for subsequent operations such as disassembly, cleaning, and maintenance.

[0024] As a preferred embodiment of the present invention, as Figure 11-14As shown, the drawer-type purification unit 506 includes a drawer-type body 5061, a mounting base 5062, and a plurality of filter cartridges 5063. Among them, mounting slide rails 5069 are respectively arranged on both sides of the drawer-type body 5061, and guiding slide bars are installed at corresponding positions of the vertical cabinet body 501. The guiding slide bars are slidably connected to the mounting slide rails 5069, so as to realize the pulling of the drawer-type body 5061 on the vertical cabinet body 501. A push-pull handle 5068 is constructed on the outer end surface of the drawer-type body 5061, which is convenient for the operator to pull the drawer-type body 5061. And connection ears 5067 are respectively constructed on both sides of the outer end surface of the drawer-type body 5061, and each connection ear 5067 is fixed on the vertical cabinet body 501 through a connection bolt. And at the sliding connection between the drawer-type body 5061 and the vertical cabinet body 501, and at the joint where the outer end surface of the drawer-type body 5061 is attached to the vertical cabinet body 501, rubber pads or rubber strips are used for sealing, so that when the drawer-type body 5061 is pushed into the vertical cabinet body 501 and fixed to the vertical cabinet body 501, liquid will not directly overflow outside the vertical cabinet body 501 or overflow into the next drawer-type purification unit 506. In this embodiment, the mounting base 5062 is assembled in the drawer-type body 5061, and the plurality of filter cartridges 5063 are installed on the mounting base 5062 at intervals. The upper end of each filter cartridge 5063 is in an open state, and the lower end of the filter cartridge 5063 is in a closed state. A filter screen 5065 is installed at the lower end of the drawer-type body 5061. The mesh number of these filter cartridges 5063 increases downward along the vertical direction, and a layer of activated carbon layer is covered on the inner wall of the lowermost filter cartridge 5063, or the lowermost filter cartridge 5063 is filled with activated carbon. The activated carbon adsorbs chromaticity, inorganic substances (heavy metals) impurities and a part of organic substances; a layer of ultrafiltration membrane is covered on the inner wall of the filter cartridge 5063 at the second-lowest position. The ultrafiltration membrane intercepts macromolecular organic substances and colloids, and the produced water can be recycled. This embodiment can realize backwashing of the drawer-type purification unit 506. Specifically, the radial length of the filter cartridge 5063 decreases downward along the vertical direction, and a conducting liquid cavity 5064 is formed between the filter cartridge 5063 and the inner cavity of the drawer-type body 5061. A conducting joint 5066 is constructed at the lower part of one end of the drawer-type body 5061 far from the push-pull handle 5068, and the conducting joint 5066 is communicated with the conducting liquid cavity 5064. Backwashing branch pipes 507 are respectively arranged on the vertical cabinet body 501 at the positions of each drawer-type purification unit 506. The backwashing branch pipes 507 are connected to the corresponding conducting joints 5066. A backwashing control valve 508 is installed on each backwashing branch pipe 507, and the backwashing branch pipes 507 are communicated with a backwashing main pipe 509. During the backwashing process, the liquid inlet joint 502 needs to be communicated with the collection tank. Pressure water enters each backwashing branch pipe 507 through the backwashing main pipe 509, and then enters each drawer-type purification unit 506. The pressure water flows reversely through the filter cartridge 5063, so that the impurities attached in the filter cartridge 5063 enter the collection tank.The sewage in the collection tank can be transported back to the drill cuttings screening mechanism 100 to be purified again.

[0025] As a preferred embodiment of the present invention, Figure 15 , 16 As shown, the extrusion dehydration mechanism 600 includes a feed cylinder 601, an extrusion cylinder 602, a discharge cylinder 603, a liquid collecting cylinder 604 and a driving rod 605, and the axes of these components coincide. Among them, the feed cylinder 601, the extrusion cylinder 602 and the discharge cylinder 603 are connected together in sequence, and the liquid collecting cylinder 604 is set outside the extrusion cylinder 602, and the extrusion cylinder 602 is covered with extrusion holes. The two ends of the driving rod 605 of this embodiment extend out of the feed cylinder 601 and the discharge cylinder 603 respectively, and a second transmission wheel 607 is coaxially mounted on the driving rod 605, and a second extrusion blade 606 is spirally extended along its axis on the driving rod 605. A feed pipe 608 is connected to the upper part of the feed cylinder 601, and the feed pipe 608 is connected to the extrusion pipe 106 on the vertical conveying cylinder 101. In this embodiment, the second transmission wheel 607 is driven to rotate, so that the second extrusion blade 606 drives the driving rod 605 to rotate, thereby realizing the spiral conveying of the solid drill cuttings and other pollutants entering the extrusion dehydration mechanism 600. During the conveying process, these pollutants cannot be discharged because the discharge pressure is not reached, and are gradually squeezed, so that the pollutants are gradually dehydrated, and the purpose of liquid-solid separation is achieved. The liquid phase enters the liquid collecting cylinder 604 through the extrusion cylinder 602, and then enters the multi-stage drawer-type purification mechanism 500. The pitch of the second extrusion blade 606 in this embodiment decreases from the feed cylinder 601 toward the discharge cylinder 603, so that the speed at which the pollutants are removed by the second extrusion blade 606 decreases, ensuring that the pollutants are dehydrated more fully.

[0026] As a preferred embodiment of the present invention, Figure 17-19As shown in the figure, a plurality of extrusion outlets 609 are formed at one end of the discharging cylinder body 603 away from the feeding cylinder body 601. An elastic opening and closing assembly is configured between the discharging cylinder body 603 and the liquid collecting cylinder body 604, and the elastic opening and closing assembly elastically closes each extrusion outlet 609. When the dehydrated pollutants at the discharging cylinder body 603 reach a certain pressure, the pollutants push open the elastic opening and closing assembly, and then are discharged from the discharging cylinder body 603 through the extrusion outlets 609. The elastic opening and closing assembly of this embodiment includes a mounting seat 611. A plurality of opening and closing sleeves 612 are fixed at one end of the mounting seat 611 close to the discharging cylinder body 603. These opening and closing sleeves 612 are arranged in one-to-one correspondence with the above-mentioned plurality of extrusion outlets 609. A discharging notch 613 is formed on the opening and closing sleeve 612. When the opening and closing sleeve 612 completely extends into the corresponding extrusion outlet 609, the extrusion outlet 609 is in a closed state. When the opening and closing sleeve 612 extends out of the extrusion outlet 609 by a certain distance and a part of the discharging notch 613 is exposed outside, the discharging cylinder body 603 is communicated with the outside. Two symmetrically arranged assembly ears 610 are configured at one end of the extrusion cylinder body 602 close to the mounting seat 611. A rigid spring 614 is installed on each assembly ear 610. A spring seat 615 is configured at one end of the rigid spring 614 away from the assembly ear 610. An adjusting bolt 616 is threadedly connected to the mounting seat 611 at a position corresponding to the rigid spring 614. The adjusting bolt 616 is rotatably connected to the corresponding spring seat 615, and a locking nut 617 is threadedly connected to the adjusting bolt 616. When the pressure of the solid pollutants in the discharging cylinder body 603 can push open the opening and closing sleeve 612, the rigid spring 614 is driven to be gradually stretched, and the mounting seat 611 moves away from the discharging cylinder body 603, so that the discharging notch 613 is communicated with the outside, and the solid pollutants are discharged from the discharging notch 613. In this embodiment, by rotating the adjusting bolt 616, the pre-tightening force of the rigid spring 614 (the stretching degree of the rigid spring 614) is adjusted, and thus the opening pressure of the elastic opening and closing assembly is changed.

[0027] As a preferred embodiment of the present invention, as Figure 1 , 9 , as shown in FIG. 15, the drill cuttings screening mechanism 100, the extrusion type dehydration mechanism 600 and the multi-stage drawer type purification mechanism 500 are connected and communicated through a connecting pipe system 400. The connecting pipe system 400 includes a first pipe body 401. The upper end of the first pipe body 401 is rotatably connected to the lower end of the vertical liquid guiding pipe 114 through a rotary joint 402. The lower end of the first pipe body 401 is connected with a third pipe body 404 and two second pipe bodies 403. A second control valve 405 is installed on the third pipe body 404. The two second pipe bodies 403 are respectively communicated with two liquid inlet joints 502, and the third pipe body 404 is communicated with the lower part of the liquid collecting cylinder body 604.

[0028] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A continuous purification treatment device for drilling fluid waste liquid, characterized in that: It includes a drilling cuttings screening mechanism with a first solid material discharge port, a second solid material discharge port and a liquid discharge port. The inlet end of the drilling cuttings discharge member is communicated with the first solid material discharge port. The inlet end of the extrusion dehydration mechanism is communicated with the second solid material discharge port. The inlet end of the multi-stage drawer type purification mechanism is communicated with the liquid discharge port. An adjustable feeding mechanism is arranged at the inlet end of the drilling cuttings screening mechanism.

2. The continuous purification treatment device for drilling fluid waste liquid according to claim 1, wherein: The drilling cuttings screening mechanism includes a vertical liquid guide pipe coaxially arranged in a vertical conveying cylinder. A mesh screening disc is connected to the upper end of the vertical liquid guide pipe. The first solid material discharge port is formed at the upper end of the vertical conveying cylinder and located at the edge of the mesh screening disc. The lower end of the adjustable feeding mechanism is close to the upper end surface of the mesh screening disc. A plurality of liquid guide holes are formed in the vertical liquid guide pipe.

3. A continuous purification treatment device for drilling fluid waste liquid according to claim 2, characterized in that: A first extrusion blade spirally extending along its axis is constructed outside the vertical liquid guide pipe. The lower end of the vertical liquid guide pipe extends out of the lower end of the vertical conveying cylinder, and the vertical liquid guide pipe is rotationally connected with the vertical conveying cylinder. A first transmission wheel is coaxially assembled at the lower end of the vertical liquid guide pipe. An extrusion pipe is constructed at the lower end of the vertical conveying cylinder. The second solid material discharge port is formed at the inlet end of the extrusion pipe. A first control valve is installed on the extrusion pipe.

4. A continuous purification treatment device for drilling fluid waste liquid according to claim 3, characterized in that: The upper end of the vertical liquid guide pipe is inserted into the central part of the mesh screening disc, and the vertical liquid guide pipe and the mesh screening disc are connected by an adjusting screw. A screening retaining strip extending along the spiral line shape is constructed on the upper end surface of the mesh screening disc.

5. A continuous purification treatment device for drilling fluid waste liquid according to any one of claims 1-4, characterized in that: The adjustable feeding mechanism includes a mounting plate detachably connected to the upper end of the drilling cuttings screening mechanism. The mounting plate extends from the outside of the drilling cuttings screening mechanism to the center of the drilling cuttings screening mechanism. A strip-shaped assembly hole extending along its length direction is formed in the mounting plate. A plurality of vertical adjusting rods are installed at intervals along the length direction of the mounting plate through the strip-shaped assembly hole. A feeding head is constructed at the lower end of each vertical adjusting rod. The feeding head is close to or in contact with the screening surface of the drilling cuttings screening mechanism.

6. The continuous purification treatment device for drilling fluid waste liquid according to claim 1, wherein: The multi-stage drawer type purification mechanism includes a vertical cabinet body with a liquid inlet joint and a liquid outlet joint respectively constructed at the upper and lower ends. A plurality of drawer type purification units are installed at intervals along the vertical direction in the vertical cabinet body. The impurities doped in the liquid are filtered by these drawer type purification units step by step from large to small according to the particle size. The liquid inlet joint is communicated with the liquid discharge port, and the liquid outlet joint is communicated with the inlet end of the pressure water pump.

7. A continuous purification treatment device for drilling fluid waste liquid according to claim 6, characterized in that: The drawer type purification unit includes a drawer type body detachably assembled in the vertical cabinet body. An assembly seat is assembled in the drawer type body. A plurality of filter cylinders are installed at intervals on the assembly seat. The upper ends of the filter cylinders are in an open state, and the lower ends of the filter cylinders are closed. A filter screen is installed at the lower end of the drawer type body.

8. The continuous purification treatment device for drilling fluid waste liquid according to claim 7, wherein: The radial length of the filter cylinder decreases downward along the vertical direction. A conducting liquid cavity is formed between the filter cylinder and the inner cavity of the drawer type body. A backwashing branch pipe is communicated with the drawer type body. A backwashing control valve is installed on each backwashing branch pipe. The backwashing branch pipe is communicated with the backwashing main pipe.

9. The continuous purification treatment device for drilling fluid waste liquid according to claim 1, characterized in that: The extrusion dehydration mechanism includes a feed cylinder body, an extrusion cylinder body, and a discharge cylinder body that are coaxially arranged and sequentially connected. A liquid collection cylinder body is coaxially sleeved outside the extrusion cylinder body. The extrusion cylinder body is covered with extrusion holes. A driving rod is coaxially arranged inside the extrusion cylinder body, and both ends of the driving rod extend out of the feed cylinder body and the discharge cylinder body respectively. A second transmission wheel is coaxially assembled on the driving rod, and a second extrusion blade that spirally extends along the axis of the driving rod is arranged on the driving rod.

10. A continuous purification treatment device for drilling fluid waste liquid according to claim 9, characterized in that: The pitch of the second extrusion blade decreases from the feed cylinder body towards the discharge cylinder body; a plurality of extrusion outlets are provided at one end of the discharge cylinder body far from the feed cylinder body. An elastic opening and closing assembly is constructed between the discharge cylinder body and the liquid collection cylinder body, and the elastic opening and closing assembly elastically closes each extrusion outlet.

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