Harmless treatment device for drilling mud waste liquid

Abstract

The invention discloses a drilling mud waste liquid innocent treatment device which comprises a plurality of vertical filter pressing bags installed in a mud-water separation box side by side, the upper end and the lower end of each vertical filter pressing bag extend out of the mud-water separation box, and a vertical multi-section type extrusion mechanism is installed in the mud-water separation box. Each vertical filter pressing bag is arranged in a vertical multi-section type extrusion mechanism, the vertical multi-section type extrusion mechanism is in transmission connection with a driving mechanism mounted outside the mud-water separation box, and a vertical driving part is mounted at the upper end of the vertical multi-section type extrusion mechanism. The device can effectively shorten the flow of solid phase and liquid phase separation in slurry, does not need to perform step-by-step separation according to the particle size of impurities, improves the purification efficiency, reduces the input cost of equipment, improves the portability, and is beneficial to subsequent operations such as transfer, transportation, disassembly, assembly and maintenance. The method is suitable for the technical field of drilling mud waste liquid treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling construction, and specifically relates to a device for harmless treatment of drilling mud waste liquid. Background Art

[0002] In drilling operations, drilling mud is essential in oil, natural gas, and geothermal drilling operations. The treatment of mud is a key link to ensure drilling efficiency, wellbore stability, and environmental protection. The basic functions of mud are to return the cuttings crushed by the drill bit from the bottom of the well to the surface, reduce the temperature of the drill bit, reduce drill tool wear, balance formation pressure to prevent blowout or wellbore collapse, form a mud cake to protect the wellbore, reduce filtration loss, transmit hydraulic energy, and assist the drill bit in breaking rocks. The treatment of mud involves multiple steps such as circulation, purification, performance adjustment, and waste treatment. The circulation path of mud is: mud pump → drill pipe → drill bit → annulus (between the wellbore and the drill pipe) → surface shaker → treatment equipment → return to the mud pit; its main equipment includes: mud pump, high-pressure pipe manifold, drill pipe, annulus return pipeline, etc. The purification of mud mainly removes the solids in the mud through shakers, hydrocyclone desanders, hydrocyclone desilters, centrifuges, etc. However, this treatment method requires multiple devices to perform progressive cooperative operations, which makes the purification process of mud longer, affects the purification efficiency, increases the equipment investment cost, and is not convenient for operations such as equipment transfer, transportation, disassembly, installation, repair, etc. Summary of the Invention

[0003] The present invention provides a device for harmless treatment of drilling mud waste liquid, which is used to shorten the process of solid-liquid separation in mud, does not require step-by-step separation according to the size of impurities, improves the purification efficiency, reduces the equipment investment cost, and at the same time improves portability, facilitating subsequent operations such as transfer, transportation, disassembly, installation, and repair.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows: A device for harmless treatment of drilling mud waste liquid includes a plurality of vertical filter bags arranged side by side in a mud-water separation tank. The upper and lower ends of each vertical filter bag respectively extend out of the mud-water separation tank. A vertical multi-segment extrusion mechanism is installed in the mud-water separation tank. Each vertical filter bag is arranged in the vertical multi-segment extrusion mechanism, and the vertical multi-segment extrusion mechanism is in transmission connection with a driving mechanism installed outside the mud-water separation tank, and a vertical driving member is installed at the upper end of the vertical multi-segment extrusion mechanism.

[0005] Further, the vertical filter bag includes a filter bag body arranged vertically, and the filter bag body is formed into a plurality of extrusion parts by being extruded by the vertical multi-segment extrusion mechanism. These extrusion parts are arranged at intervals in the vertical direction. A mud inlet pipe and a mud residue discharge pipe are respectively constructed at the upper and lower ends of the filter bag body, and the mud inlet pipe is communicated with a mud main pipe.

[0006] Furthermore, the vertical multi-segment extrusion mechanism includes a plurality of elastic extrusion units respectively corresponding to a plurality of vertical filter bags. These elastic extrusion units are in transmission connection with a driving mechanism. The upper ends of these elastic extrusion units are slidably connected to a transverse sliding rod, and the lower end of a vertical driving member is connected to the transverse sliding rod. Each of the vertical filter bags is located within a corresponding elastic extrusion unit.

[0007] Furthermore, the elastic extrusion unit includes two segmental side pressure assemblies and two opening and closing receiving assemblies. The two segmental side pressure assemblies are symmetrically arranged on both sides of the vertical filter bag. The same-side ends of the two segmental side pressure assemblies are slidably connected to the corresponding opening and closing receiving assemblies. The upper ends of the two segmental side pressure assemblies are slidably connected to the transverse sliding rod, and the two opening and closing receiving assemblies are in transmission connection with the driving mechanism.

[0008] Furthermore, the segmental side pressure assembly includes a plurality of extrusion members arranged at intervals in the vertical direction. Vertically adjacent extrusion members are connected by elastic members, and an elastic member is also arranged between the lowermost extrusion member and the bottom wall of the muddy water separation tank. The two ends of each extrusion member are respectively slidably connected to the two opening and closing receiving assemblies.

[0009] Furthermore, the extrusion member includes an extrusion bent rod bent towards the vertical filter bag. Connection seats are respectively fixed at both ends of the extrusion bent rod. Sliders are configured on the connection seats. The sliders are slidably connected to the opening and closing receiving assemblies. The elastic member connects two vertically aligned connection seats of the two extrusion members.

[0010] Furthermore, the elastic member includes a connection spring with both ends respectively connected to the corresponding connection seats. The connection spring includes a cylindrical spring, a conical spring or a spindle-shaped spring. The radial length of the middle part of the spindle-shaped spring is greater than the radial lengths of its two ends, and the pitches of a plurality of connection springs arranged at intervals in the vertical direction in the segmental side pressure assembly decrease.

[0011] Furthermore, a spring seat is configured at the upper end of the connection spring. A vertical adjustment bolt is threadedly connected to the spring seat. The upper end of the vertical adjustment bolt is rotatably connected to the lower end of the corresponding connection seat.

[0012] Further, the opening and closing type receiving assembly includes two vertical sliding seats respectively arranged corresponding to the two segmented side pressing assemblies. The same-side ends of the two segmented side pressing assemblies are respectively and slidably connected to the two vertical sliding seats, and the two vertical sliding seats are connected by a transverse transmission lead screw. The transverse transmission lead screw has a positive thread portion and a reverse thread portion. One vertical sliding seat is threadedly connected to the positive thread portion, and the other vertical sliding seat is threadedly connected to the reverse thread portion. Moreover, the two vertical sliding seats are slidably connected to a transverse guide rod. The transverse transmission lead screws on the same side in adjacent elastic extrusion units are coaxially connected in series, and the transverse guide rods on the same side are coaxially connected in series.

[0013] Further, the driving mechanism includes a driving motor installed on the side wall of the mud separation tank. A first transmission wheel is coaxially assembled on the output shaft of the driving motor. Second transmission wheels are respectively coaxially assembled on the two transverse transmission lead screws extending out of the mud separation tank in the elastic extrusion unit. The first transmission wheel and the two second transmission wheels are connected by a transmission chain.

[0014] Due to the adoption of the above structure, compared with the prior art, the technical progress achieved by the present invention is as follows: The present invention synchronously and continuously feeds the slurry into a plurality of vertical filter bags. During this process, the driving mechanism is controlled to act, so that it drives the vertical multi-segment extrusion mechanism to clamp, release, and then clamp again... these vertical filter bags. At the same time, when clamping, the vertical multi-segment extrusion mechanism divides each vertical filter bag into a plurality of segments, and these segments are arranged at intervals in the vertical direction. The vertical driving member is controlled to drive the vertical multi-segment extrusion mechanism to move downward, so that the vertical multi-segment extrusion mechanism squeezes the vertical filter bags segment by segment downward, so that the liquid phase gradually drains from the vertical filter bags; and because the liquid phase in the slurry is gradually squeezed and separated in different segments from top to bottom, the separation of the entire solid phase and liquid phase is in a progressive state; when releasing, the vertical driving member is controlled to drive the vertical multi-segment extrusion mechanism to move upward to facilitate the next clamping and squeezing operation, thereby ensuring the continuity of the operation. The separated liquid phase needs to be performance-adjusted. The density is controlled by adding barite or hematite; the density is reduced by adding water or a diluent; the viscosity is adjusted by using a viscosifier (such as bentonite) or a viscosity reducer (such as a diluent); the filtration loss is controlled by adding a filtration loss reducer (such as CMC, starch); the pH value is adjusted by using caustic soda (NaOH) or lime; the inhibition is adjusted by adding KCl, polymer, etc. to inhibit the hydration swelling of the formation. Then, it is recycled. The separated solid phase is added with a curing agent such as cement and lime to stabilize the harmful substances. In summary, the present invention can effectively shorten the process of separating the solid phase and liquid phase in the slurry, without the need for step-by-step separation according to the size of the impurity particles, improving the purification efficiency, reducing the equipment input cost, and at the same time improving the portability, which is conducive to subsequent transfer, transportation, disassembly, maintenance and other operations. 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. Together with the embodiments of the present invention, they are used 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 view of an embodiment of the present invention; Figure 2 is a schematic structural view of another angle of an embodiment of the present invention; Figure 3 is a schematic structural view of the inside of the muddy water separation box in an open state of an embodiment of the present invention; Figure 4 is Figure 3 a top view of the structure shown; Figure 5 is Figure 3 a front view of the structure shown; Figure 6 is a schematic structural view of the connection of a single elastic extrusion unit, a vertical filter press bag and a vertical driving member in a vertical multi-segment extrusion mechanism of an embodiment of the present invention; Figure 7 is a front view of the connection of a segmental side pressing assembly, a vertical filter press bag and a vertical driving member in an embodiment of the present invention; Figure 8 is a schematic structural view of a vertical filter press bag in an embodiment of the present invention; Figure 9 is a schematic structural view of the connection of two vertical driving members to two segmental side pressing assemblies through two horizontal sliding rods in an embodiment of the present invention; Figure 10 is a schematic structural view of the connection of two vertically adjacent extrusion members in an embodiment of the present invention; Figure 11 is Figure 10 a front view of the structure shown; Figure 12 is a schematic structural view of the connection of two vertically adjacent extrusion members through a shuttle-shaped spring in an embodiment of the present invention; Figure 13 is a schematic structural view of the connection of two vertically adjacent extrusion members through a conical spring in an embodiment of the present invention; Figure 14 is a schematic structural view of an opening and closing type receiving assembly in an embodiment of the present invention.

[0017] Labeled components: 100 - Mud separation tank, 101 - Tank body, 102 - Lower liquid collection part, 103 - Drain pipe, 104 - Adapter beam, 200 - Vertical filter press bag, 201 - Filter bag body, 202 - Extrusion part, 203 - Mud inlet pipe, 204 - First control valve, 205 - Sludge discharge pipe, 206 - Second control valve, 300 - Vertical multi - segment extrusion mechanism, 301 - Connecting seat, 302 - Slide block, 303 - Connecting spring, 304 - Extrusion bent rod, 305 - Horizontal slide bar, 306 - Spring seat, 307 - Vertical adjustment bolt, 308 - Adjustment part, 309 - Spindle spring, 310 - Tapered spring, 311 - Vertical sliding seat, 312 - Horizontal transmission lead screw, 313 - Right - hand thread part, 314 - Left - hand thread part, 315 - Horizontal guide bar, 400 - Driving mechanism, 401 - Driving motor, 402 - First driving wheel, 403 - Second driving wheel, 404 - Transmission chain, 500 - Vertical driving part, 600 - Mud main pipe. Detailed implementation mode

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0019] The present invention discloses a harmless treatment device for drilling mud waste liquid, as Figures 1-14As shown, it includes a mud-water separation box 100, a vertical multi-segment extrusion mechanism 300, a driving mechanism 400, a vertical driving member 500 and a plurality of vertical filter press bags 200. Among them, a plurality of vertical filter press bags 200 are installed side by side in the mud-water separation box 100, and the upper and lower ends of each vertical filter press bag 200 extend out of the mud-water separation box 100 respectively, the vertical multi-segment extrusion mechanism 300 is installed in the mud-water separation box 100, and all the vertical filter press bags 200 are arranged in the vertical multi-segment extrusion mechanism 300. The driving mechanism 400 is installed outside the mud-water separation box 100, the vertical multi-segment extrusion mechanism 300 is transmission-connected with the driving mechanism 400, and the lower end of the vertical driving member 500 is connected to the upper end of the vertical multi-segment extrusion mechanism 300. The working principle and advantages of the present invention are as follows: the present invention synchronously and continuously passes the slurry into a plurality of vertical filter bags 200. During this process, the driving mechanism 400 is controlled to operate so as to drive the vertical multi-segment extrusion mechanism 300 to perform multi-segment clamping, loosening, and re-clamping of the vertical filter bags 200. At the same time, during clamping, the vertical multi-segment extrusion mechanism 300 divides each vertical filter bag 200 into a plurality of segments, which are arranged in sequence at intervals in the vertical direction. The vertical driving member 500 is controlled to drive the vertical multi-segment extrusion mechanism 300 to perform multi-segment clamping, loosening, and re-clamping of the vertical filter bags 200. The vertical multi-segment extrusion mechanism 300 moves downward, so that the vertical multi-segment extrusion mechanism 300 extrudes the vertical filter bag 200 in sections downward, so that the liquid phase is gradually discharged from the vertical filter bag 200; and because the liquid phase in the mud is squeezed and separated step by step from top to bottom in different sections, the separation of the entire solid phase and liquid phase is in a progressive state; when loosening, the vertical drive member 500 is controlled to drive the vertical multi-segment extrusion mechanism 300 to move upward, so as to facilitate the next clamping and extrusion operation, thereby ensuring the continuity of the operation. The separated liquid phase needs to be adjusted in performance, by adding barite (Barite) or hematite to control density; by adding water or diluent to reduce density; by using thickeners (such as bentonite) or viscosity reducers (such as diluents) to achieve viscosity adjustment; by adding fluid loss reducers (such as CMC, starch) to control fluid loss; by using caustic soda (NaOH) or lime to adjust the pH value; by adding KCl, polymers, etc. to inhibit formation hydration expansion, to achieve adjustment of inhibition. After that, it is recycled. The separated solid phase is added with cement, lime and other curing agents to stabilize the harmful substances. In summary, the present invention can effectively shorten the solid-liquid phase separation process in the mud, and there is no need to separate the impurities step by step according to the size of the impurity particles, thereby improving the purification efficiency, reducing the investment cost of the equipment, and improving the portability, which is conducive to subsequent transfer, transportation, disassembly and maintenance operations.

[0020] As a preferred embodiment of the present invention, Figure 2As shown, the slurry separation tank 100 includes a tank body 101. A lower liquid collecting part 102 is formed at the lower end of the tank body 101. The middle part of the lower liquid collecting part 102 bulges downward, and a drain pipe 103 is connected to the lower liquid collecting part 102. The liquid phase extruded by the vertical filter bag 200 accumulates in the lower liquid collecting part 102 and is then discharged through the drain pipe 103. A transfer beam 104 is detachably connected to the upper end of the tank body 101, and a vertical driving member 500 is connected to the transfer beam 104. The vertical driving member 500 is generally a cylinder, an oil cylinder or an electric cylinder.

[0021] As a preferred embodiment of the present invention, as Figure 7 , 8 shown, the vertical filter bag 200 includes a filter bag body 201 arranged vertically. The filter bag body 201 is extruded by a vertical multi-segment extrusion mechanism 300 to form a plurality of extrusion parts 202, and these extrusion parts 202 are arranged at intervals in the vertical direction. In this embodiment, a slurry inlet pipe 203 is constructed at the upper end of the filter bag body 201, a first control valve 204 is installed on the slurry inlet pipe 203, a sludge discharge pipe 205 is constructed at the lower end of the filter bag body 201, a second control valve 206 is installed on the sludge discharge pipe 205, and the slurry inlet pipe 203 is communicated with the slurry main pipe 600. The slurry enters each slurry inlet pipe 203 through the slurry main pipe 600 of this embodiment, and then enters each filter bag body 201. Since the slurry is extruded step by step, the water content of the solid phase in the extrusion part 202 decreases from top to bottom, thereby preventing the slurry entering the filter bag body 201 from flowing directly out through the sludge discharge pipe 205 unobstructed. When initially separating the solid and liquid of the slurry, at this time, the filter bag body 201 is in an empty state. At this time, the second control valve 206 needs to be closed first to prevent the slurry from entering the filter bag body 201 and flowing directly out through the sludge discharge pipe 205 in a flowing state. Then, the slurry continues to be added to the filter bag body 201, and the vertical multi-segment extrusion mechanism 300 segments the slurry in the filter bag body 201 and continuously extrudes downward at the same time. After extrusion, the vertical multi-segment extrusion mechanism 300 returns to the initial position, and then performs the next extrusion clamping and extrusion operation, so that the slurry in the upper position is transferred to the lower position, thereby achieving the purpose of gradually separating the liquid phase, and ensuring the continuity of solid-liquid separation. In this embodiment, the opening and closing of the second control valve 206 can be adjusted according to needs, so as to ensure that the humidity of the solid phase discharged through the sludge discharge pipe 205 reaches the predetermined range. That is, when the humidity of the solid phase exceeds the predetermined range, the second control valve 206 is closed to prevent the solid phase from being discharged. Under the reciprocating extrusion of the vertical multi-segment extrusion mechanism 300, until the humidity of the solid phase at the bottom reaches the predetermined range, the second control valve 206 is opened. The second control valve 206 generally selects an electromagnetic valve, and a humidity sensor (SM150T capacitive sensor) is installed at the connection between the sludge discharge pipe 205 and the filter bag body 201 to monitor the humidity of the solid phase.

[0022] As a preferred embodiment of the present invention, Figures 3-6 As shown, the vertical multi-segment extrusion mechanism 300 includes a plurality of elastic extrusion units, which are arranged one by one with the plurality of vertical filter bags 200, that is, each vertical filter bag 200 is arranged in the corresponding elastic extrusion unit, and these elastic extrusion units are connected to the driving mechanism 400 in a transmission manner, and the upper ends of these elastic extrusion units are slidably connected to two transverse slide bars 305, which are arranged side by side. There are two vertical driving members 500, and the lower end of each vertical driving member 500 is connected to the corresponding transverse slide bar 305. In this embodiment, the driving mechanism 400 is controlled to act so as to drive all the elastic extrusion units to act synchronously, and the vertical driving member 500 is controlled to vertically drive the transverse slide bar 305 to move in the vertical direction, so that the transverse slide bar 305 drives these elastic extrusion units to move vertically, so as to achieve the purpose of vertically downward extrusion of each vertical filter bag 200, so that the liquid phase in the mud is squeezed out step by step.

[0023] As a preferred embodiment of the present invention, Figure 6 , 7As shown in 9-14, the elastic extrusion unit includes two segmented side pressure assemblies and two opening and closing receiving assemblies. Among them, the two segmented side pressure assemblies are symmetrically arranged on both sides of the vertical filter press bag 200, the same side ends of the two segmented side pressure assemblies are slidably connected with the corresponding opening and closing receiving assemblies, the upper ends of the two segmented side pressure assemblies are slidably connected with the corresponding transverse sliding rods 305 on the same side, and the two opening and closing receiving assemblies are transmission-connected with the driving mechanism 400. The segmented side pressure assembly includes a plurality of extrusion members, which are arranged at intervals in the vertical direction, and the vertically adjacent extrusion members are connected together by elastic members, and an elastic member is also arranged between the extrusion member at the lowest end and the bottom wall of the mud-water separation box 100, and the two ends of each extrusion member are slidably connected with the two opening and closing receiving assemblies one by one. The specific structure of the extrusion component of this embodiment is that the extrusion component includes an extrusion bent rod 304 and two connecting seats 301, wherein the middle part of the extrusion bent rod 304 is bent toward the vertical filter bag 200, and the two connecting seats 301 are fixedly installed at the two ends of the extrusion bent rod 304 respectively. A slider 302 is constructed on the connecting seat 301, and the slider 302 is slidably connected with the opening and closing type receiving assembly, and the elastic member connects the two connecting seats 301 vertically aligned in the two extrusion components. The specific structure of the opening and closing type receiving assembly of this embodiment is that the opening and closing type receiving assembly includes two vertical sliding seats 311, and the two vertical sliding seats 311 are arranged in a one-to-one correspondence with the two segmented side pressure assemblies, and the same side ends of the two segmented side pressure assemblies are slidably connected with the two vertical sliding seats 311, and the two vertical sliding seats 311 are connected by a transverse transmission screw 312. The transverse transmission screw 312 has a positive thread portion 313 and a negative thread portion 314, wherein one vertical sliding seat 311 is threadedly connected to the positive thread portion 313, and the other vertical sliding seat 311 is threadedly connected to the negative thread portion 314, and the two vertical sliding seats 311 are slidably connected to the transverse guide rod 315, and both ends of the transverse guide rod 315 are connected to the mud-water separation box 100, and the transverse transmission screws 312 and the transverse guide rods 315 on the same side of the adjacent elastic extrusion units are coaxially connected. Figure 2As shown, the driving mechanism 400 includes a driving motor 401, which is installed on the side wall of the mud separation tank 100. A first transmission wheel 402 is coaxially assembled on the output shaft of the driving motor 401. Second transmission wheels 403 are coaxially assembled on two transverse transmission lead screws 312 that extend out of the mud separation tank 100 in the elastic extrusion unit. The first transmission wheel 402 and the two second transmission wheels 403 are drivingly connected by a transmission chain 404. The working principle and advantages of this embodiment are as follows: When it is necessary to clamp or release the vertical filter bag 200 in multiple segments, the driving motor 401 is controlled to act, so that it drives the two second transmission wheels 403 to rotate synchronously, realizing the mutual approach or separation of the two vertical sliding seats 311 in each opening and closing type receiving component. During the movement of these two vertical sliding seats 311, the extrusion members opposite to each other on both sides of the vertical filter bag 200 in the segmented side pressure component approach or separate from each other, thereby realizing the clamping or releasing of the vertical filter bag 200 in multiple segments along the vertical direction. In this embodiment, by controlling the vertical driving member 500 to act, the segmented side pressure component is elastically compressed or elastically returned along the vertical direction; during the elastic compression process, the vertical filter bag 200 is in a state of being clamped in multiple segments. In this way, the mud in the vertical filter bag 200 is driven downward in segments and step by step. Moreover, in order to make the vertical stroke of the extrusion at the segment decrease downward along the vertical direction, so as to ensure that the mud in the vertical filter bag 200 is effectively compressed step by step during the downward driving and extrusion process, that is, the water content of the mud between the segments located above is high and the extrusion stroke is large, and the water content of the mud between the segments located below is small and the extrusion stroke also becomes smaller accordingly. The measure taken is that the elastic member includes a connecting spring 303, and both ends of the connecting spring 303 are respectively connected to the corresponding connecting seats 301. Among them, the connecting spring 303 includes a cylindrical spring, a conical spring 310 or a fusiform spring 309, and the radial length of the middle part of the fusiform spring 309 is greater than the radial lengths of its two ends. Moreover, the pitches of the multiple connecting springs 303 arranged at intervals downward along the vertical direction in the segmented side pressure component decrease, that is, the pitch of the connecting spring 303 located above is greater than the pitch of the connecting spring 303 located below. In this way, during the downward driving process of the vertical driving member 500, the compression strokes of these connecting springs 303 decrease along the vertical direction. Furthermore, the downward movement strokes of the mud at different segments decrease along the vertical direction, achieving the purpose of effective extrusion; avoiding the situation where the mud strokes at different segments are the same or the mud strokes at different segments increase along the vertical direction, and thus unable to achieve the extrusion effect. Generally speaking, the movement speed of the upper part of the mud is greater than that of the lower part. In this way, the purpose of gradually squeezing and dewatering downward can be achieved.Moreover, since the vertical driving member 500 drives different strokes, the degree to which the mud is driven and squeezed is also different. That is, as the downward driving stroke of the vertical driving member 500 increases, the downward driving stroke of the mud in the vertical filter bag 200 is segmented and gradually increased accordingly. In this way, the compression degree of the connecting spring 303 with a larger pitch is greater than that of the connecting spring 303 with a smaller pitch, so that the effect of gradual extrusion is improved. In the reciprocating driving stroke of the vertical driving member 500 in the vertical reverse direction in this embodiment, the adjacent driving strokes (the current downward driving stroke and the next downward driving stroke) are different, which improves the effect of downward squeezing and conveying of the mud in the vertical filter bag 200.

[0024] As a preferred embodiment of the present invention, as Figure 10 , 11 shown, a spring seat 306 is constructed at the upper end of the connecting spring 303. A vertical adjusting bolt 307 is threadedly connected to the spring seat 306. And the lower end of the vertical adjusting bolt 307 passes through the spring seat 306. The upper end of the vertical adjusting bolt 307 is rotatably connected to the lower end of the corresponding connecting seat 301. An adjusting portion 308 with a regular hexagon cross-section is constructed at the upper part of the vertical adjusting bolt 307. In this embodiment, a wrench is used to adjust the adjusting portion 308, so that the adjusting portion 308 drives the vertical adjusting bolt 307 to rotate. During the rotation of the vertical adjusting bolt 307, the spring seat 306 is driven to move in the vertical direction, thereby adjusting the pre-tightening force of the connecting spring 303, and then adjusting the mud stroke at the corresponding segment, so as to ensure effective squeezing and dehydration.

[0025] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended 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 in the scope of protection of the claims of the present invention.

Claims

1. An apparatus for harmless treatment of drilling mud waste liquid, characterized in that: It includes a plurality of vertical filter bags installed side by side in the mud-water separation tank. The upper and lower ends of each of the vertical filter bags extend out of the mud-water separation tank respectively. A vertical multi-segment extrusion mechanism is installed in the mud-water separation tank. Each vertical filter bag is arranged in the vertical multi-segment extrusion mechanism, and the vertical multi-segment extrusion mechanism is in transmission connection with a driving mechanism installed outside the mud-water separation tank. And a vertical driving part is installed at the upper end of the vertical multi-segment extrusion mechanism.

2. The harmless treatment device for drilling mud waste liquid according to claim 1, wherein: The vertical filter bag includes a filter bag body arranged vertically. And the filter bag body is extruded by the vertical multi-segment extrusion mechanism to form a plurality of extrusion parts. These extrusion parts are arranged at intervals vertically. A slurry inlet pipe and a mud residue discharge pipe are respectively constructed at the upper and lower ends of the filter bag body. And the slurry inlet pipe is communicated with the slurry main pipe.

3. The harmless treatment device for drilling mud waste liquid according to claim 1, characterized in that: The vertical multi-segment extrusion mechanism includes a plurality of elastic extrusion units arranged in one-to-one correspondence with a plurality of vertical filter bags. These elastic extrusion units are in transmission connection with the driving mechanism. The upper ends of these elastic extrusion units are slidably connected to a transverse sliding rod. The lower end of the vertical driving part is connected to the transverse sliding rod. Each of the vertical filter bags is located in the corresponding elastic extrusion unit.

4. An innocuous treatment device for drilling mud waste liquid according to claim 3, characterized in that: The elastic extrusion unit includes two segmental side pressure assemblies and two opening and closing receiving assemblies. The two segmental side pressure assemblies are symmetrically arranged on both sides of the vertical filter bag. The same-side ends of the two segmental side pressure assemblies are slidably connected to the corresponding opening and closing receiving assemblies. The upper ends of the two segmental side pressure assemblies are slidably connected to the transverse sliding rod. And the two opening and closing receiving assemblies are in transmission connection with the driving mechanism.

5. The harmless treatment device for drilling mud waste liquid according to claim 4, characterized in that: The segmental side pressure assembly includes a plurality of extrusion members arranged at intervals in the vertical direction. The vertically adjacent extrusion members are connected by elastic members. And an elastic member is also arranged between the lowermost extrusion member and the bottom wall of the mud-water separation tank. The two ends of each of the extrusion members are slidably connected to the two opening and closing receiving assemblies one by one.

6. The harmless treatment device for drilling mud waste liquid according to claim 5, wherein: The extrusion member includes an extrusion bent rod bent towards the vertical filter bag. Connection seats are respectively fixed at the two ends of the extrusion bent rod. A slider is constructed on the connection seat. The slider is slidably connected to the opening and closing receiving assembly. The elastic member connects the two connection seats vertically aligned in the two extrusion members.

7. An apparatus for harmless treatment of drilling mud waste liquid according to claim 6, characterized in that: The elastic member includes a connection spring with its two ends respectively connected to the corresponding connection seats. The connection spring includes a cylindrical spring, a conical spring or a spindle-shaped spring. The radial length of the middle part of the spindle-shaped spring is greater than the radial lengths of its two ends. And the pitches of the plurality of connection springs arranged at intervals vertically downward in the segmental side pressure assembly decrease.

8. The harmless treatment device for drilling mud waste liquid according to claim 7, wherein: A spring seat is constructed at the upper end of the connection spring. A vertical adjusting bolt is threadedly connected to the spring seat. The upper end of the vertical adjusting bolt is rotatably connected to the lower end of the corresponding connection seat.

9. The harmless treatment device for drilling mud waste liquid according to claim 4, wherein: The opening and closing type receiving assembly includes two vertical sliding seats arranged corresponding to the two segmented side pressing assemblies one by one. The same-side ends of the two segmented side pressing assemblies are slidably connected to the two vertical sliding seats one by one, and the two vertical sliding seats are connected by a transverse transmission lead screw. The transverse transmission lead screw has a positive thread portion and a reverse thread portion. One of the vertical sliding seats is threadedly connected to the positive thread portion, and the other vertical sliding seat is threadedly connected to the reverse thread portion. Moreover, the two vertical sliding seats are slidably connected to a transverse guide rod. The transverse transmission lead screws located on the same side in adjacent elastic extrusion units are coaxially connected in series, and the transverse guide rods located on the same side are coaxially connected in series.

10. The harmless treatment device for drilling mud waste liquid according to claim 9, characterized in that: The driving mechanism includes a driving motor installed on the side wall of the mud-water separation tank. A first transmission wheel is coaxially assembled on the output shaft of the driving motor. Second transmission wheels are respectively coaxially assembled on the two transverse transmission lead screws extending out of the mud-water separation tank in the elastic extrusion unit. The first transmission wheel and the two second transmission wheels are connected by a transmission chain.

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