A harmless treatment system and method for waste drilling mud

Abstract

The present invention discloses a harmless treatment system and method for waste drilling mud, which belongs to the field of drilling mud treatment; the system includes a horizontally placed mud storage tank, which is connected to a plurality of branch pipes arranged in a linear array, and the plurality of branch pipes are commonly connected to a mud output pipe, and the plurality of branch pipes are all connected to a valve housing, and the plurality of valve housings are rotatably connected to a spherical valve core, and the valve stems of the plurality of spherical valve cores are all fixedly connected to a first gear; two transmission wheels are rotatably connected to the outer wall of the mud storage tank, and a first belt is connected for transmission between the two transmission wheels, and the first belt is provided with teeth, and when the transmission wheel rotates, the teeth are engaged with the plurality of first gears in turn to drive the plurality of first gears to rotate 360 ​​degrees in turn, so that the plurality of branch pipes are connected to the mud storage tank in turn; the method can dehydrate the mud at the drilling site and reuse the solid phase; the system can evenly discharge mud with relatively consistent particle size, which is convenient for subsequent mud treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling mud treatment, and in particular to a system and method for harmless treatment of waste drilling mud. Background Art

[0002] With the rapid development of the oil and gas industry, the harmless disposal of waste drilling mud has become a critical environmental issue. Drilling mud often contains large amounts of clay, rock debris, chemical additives, and hazardous substances (such as heavy metals and petroleum). Direct discharge can cause severe pollution to soil and water bodies. Therefore, efficiently separating the solid and liquid phases in the mud and classifying and treating solid particles of varying sizes have become key technical challenges in this field.

[0003] Traditional mud treatment systems often use a single discharge port design, which can easily lead to the following problems when discharging mud: Low separation efficiency due to uneven particle size distribution: After standing in the storage tank, mud will naturally stratify, with large particles settling to the bottom and small particles floating on the top. If it is discharged only from a fixed position, the large particles in the bottom layer will not be fully discharged, and the fine particles in the upper layer will be mixed in prematurely, affecting the subsequent filter press dewatering effect; filter cloth clogging and high treatment costs: When unclassified mixed-particle mud is directly fed into the filter press, fine particles (such as colloids) can easily clog the filter cloth pores, reducing filtration speed, increasing equipment loss and operating costs; limited resource utilization: Mud particles of different particle sizes have different uses in subsequent processing (for example, coarse particles can be used for construction materials, and fine particles can be used for soil improvement), making it difficult to achieve targeted classification and reuse with traditional treatment methods. Summary of the Invention

[0004] The purpose of the present invention is to provide a system and method for harmless treatment of waste drilling mud, which solves the problem that the mud discharged by the existing device has uneven particle size, resulting in inconvenience in subsequent utilization.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a harmless treatment system for drilling waste mud, comprising a horizontally placed mud storage tank, the mud storage tank being connected to a plurality of branch pipes arranged in a linear array, the plurality of branch pipes being commonly connected to a mud output pipe, the plurality of branch pipes being connected to a valve housing, the plurality of valve housings being rotatably connected to a spherical valve core, and the valve stems of the plurality of spherical valve cores being fixedly connected to a first gear;

[0006] Two transmission wheels are rotatably connected to the outer wall of the mud storage tank, and a first belt is connected between the two transmission wheels. The first belt is provided with teeth. When the transmission wheel rotates, the teeth engage with multiple first gears in turn to drive multiple first gears to rotate 360 ​​degrees in turn, so that multiple branch pipes are connected to the mud storage tank in turn.

[0007] Preferably, the transmission wheel includes two limiting plates and a second gear, the two limiting plates are coaxially connected to the two end faces of the second gear respectively, and the first belt is embedded between the two limiting plates.

[0008] Preferably, it further comprises a bracket fixedly connected to the mud storage tank, a motor is fixedly connected to the bracket, an output end of the motor is fixedly connected to a piston pump, and the piston pump is connected to the mud output pipe.

[0009] Preferably, the output end of the motor is fixedly connected to a driving wheel, one of the transmission wheels is coaxially fixedly connected to a driven wheel, and a second belt is transmission-connected between the driving wheel and the driven wheel.

[0010] Preferably, the end of the mud output pipe away from the mud storage tank is connected to a switching pipe, the two ends of the switching pipe are respectively connected to the first filter press and the second filter press, the mud output pipe is connected to a particle size analyzer, and an electromagnetic three-way valve is provided at the connection between the mud output pipe and the switching pipe. When the particle size analyzer detects that the mud particle size in the mud output pipe is large, the electromagnetic three-way valve is operated to allow the mud to be transported to the first filter press.

[0011] Preferably, the mesh number of the filter cloth of the first filter press is smaller than the mesh number of the filter cloth of the second filter press.

[0012] Preferably, both ends of the switching pipe are connected to vertical pipes, and both vertical pipes are connected to horizontal pipes, and the two horizontal pipes are connected to the first filter press and the second filter press respectively;

[0013] It also includes two material barrels, and a material barrel is connected between the two material barrels and the two horizontal tubes. A counterweight column is slidably connected in the two material barrels, and the counterweight column is in contact with the inner wall of the material barrel.

[0014] Preferably, a lifting rod is slidably connected in the vertical tube, a mounting block is fixedly connected to the top of the lifting rod, an inclined sliding groove is provided on the mounting block, a material baffle plate is radially inserted into the material tube, a sliding rod is fixedly connected to the end of the material baffle plate, and the sliding rod is slidably connected in the inclined sliding groove;

[0015] The material barrel is fixedly connected with an N-shaped frame, the N-shaped frame is fixedly connected with two horizontal bars, and the baffle plate is slidably connected between the two horizontal bars.

[0016] Preferably, a rectangular plate is fixedly connected to each of the two material barrels, a guide rod is fixedly connected to the mounting block, the guide rod passes through the rectangular plate, and a spring is connected between the rectangular plate and the mounting block, and solenoid valves are provided at both ends of the switching tube. When the first filter press or the second filter press on the same side as the solenoid valve is not in operation, the corresponding solenoid valve is opened to relieve pressure in the corresponding vertical pipe;

[0017] A speed control switch is provided on the lower surface of the two rectangular plates, and a pressing column that cooperates with the two speed control switches is connected to the two mounting blocks. The speed control switch close to the first filter press is used to control the motor speed to decrease, and the speed control switch close to the second filter press is used to control the motor speed to increase.

[0018] A method for harmlessly treating waste drilling mud, using the above-mentioned harmless treatment system for waste drilling mud, comprises the following steps:

[0019] The mud from the drilling site is transported to the factory mud storage pool for temporary storage and tempering agent is added for mixing;

[0020] The prepared mud is transferred to the mud storage tank, and the mud storage tank transports mud of different particle sizes to the first filter press and the second filter press for dehydration;

[0021] The material dehydrated by the second filter press is dry material. Biodegradable materials are added to the dry material and mixed thoroughly. After being piled and allowed to stand, the organic matter in the dry material is decomposed into carbon dioxide and water, forming harmless nutrient soil and green soil.

[0022] The material dehydrated by the first filter press is solid phase material. A curing agent is added to the solid phase material, and the mixed material is sent to the main mold cavity of the static pressure curing equipment. The solidified material after pressure curing is sent to the stabilization curing area. After passing the inspection during the curing period, it is used to make building materials.

[0023] Sewage treatment: The wastewater separated by filtration and the domestic sewage introduced from outside the factory are mixed in a mixing and regulating tank, and appropriate amount of reagents are added to adjust the pH value of the sewage to the process technology design requirements;

[0024] The regulated sewage enters the anaerobic tank for anaerobic reaction;

[0025] The sewage after anaerobically treated enters the anoxic tank for anoxic reaction;

[0026] The sewage treated with anoxic treatment enters the aerobic tank for aerobic reaction;

[0027] A small amount of mixed liquid from the aerobic tank flows back to the anoxic tank to continue participating in anoxic and aerobic reactions. The remaining sewage enters the sedimentation tank for sedimentation. The purified water after sedimentation enters the clean water tank. Part of the sludge flows back to the anaerobic tank to continue participating in anaerobic, anoxic and aerobic reactions. The remaining sludge enters the slurry tank.

[0028] The sludge with a moisture content of more than 99% is dehydrated to form a solid state and then transported out;

[0029] The purified water enters the sampling pool after being temporarily stored in the purification pool and the transition pool;

[0030] Sampling is taken from the sampling pool for outflow water quality testing.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention enables the teeth on the first belt to mesh with multiple first gears in turn, and drives the multiple first gears to rotate 360 ​​degrees in sequence, so that the spherical valve core can rotate 360 ​​degrees, so that the corresponding branch pipes are opened and then closed, and the multiple branch pipes are opened in turn, so that the mud deposited at the bottom of the horizontal mud storage tank is discharged uniformly in the horizontal direction, avoiding the situation where the mud in a fixed place is continuously discharged and the mud with larger particle size in other horizontal positions cannot be discharged. That is, by setting up multiple branch pipes to open and discharge mud in sequence, the mud with large particles in the bottom layer can be discharged before the mud with smaller particle size in the upper layer is discharged, which is convenient for subsequent pressure filtration and dehydration operations, and is also beneficial for the classification and reuse of mud with different particle sizes after dehydration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic structural diagram of the mud output pipe of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the piston pump of the present invention;

[0036] Figure 4 This is a schematic structural diagram of the spherical valve core of the present invention;

[0037] Figure 5 It is a structural schematic diagram of the transmission wheel of the present invention;

[0038] Figure 6 This is a structural diagram of the switching tube of the present invention;

[0039] Figure 7 It is a structural schematic diagram of the material baffle of the present invention;

[0040] Figure 8 It is a structural diagram of the speed regulating switch of the present invention.

[0041] In the figure: 100, mud storage tank; 110, feed pipe; 120, bracket; 200, mud output pipe; 210, branch pipe; 220, valve housing; 230, first gear; 240, spherical valve core; 250, transmission wheel; 251, second gear; 252, limit plate; 260, first belt; 261, teeth; 300, motor; 310, piston pump; 320, driving wheel; 330, driven wheel; 340, second belt; 400, particle size analyzer; 410, electromagnetic tee Valve; 420, switching tube; 421, solenoid valve; 430, vertical tube; 440, horizontal tube; 500, first filter press; 600, second filter press; 700, parameter barrel; 710, parameter tube; 720, counterweight column; 730, mounting block; 731, guide rod; 732, spring; 733, inclined slide; 740, lifting rod; 750, rectangular plate; 760, material baffle; 770, slide rod; 780, N-shaped frame; 781, horizontal bar; 790, pressing column; 791, speed control switch. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Reference Figures 1-8 , this embodiment provides a technical solution: a harmless treatment system for drilling waste mud, including a horizontally placed mud storage tank 100, which is connected to a plurality of branch pipes 210 arranged in a linear array, and the plurality of branch pipes 210 are commonly connected to a mud output pipe 200, and the plurality of branch pipes 210 are all connected to a valve housing 220, and the plurality of valve housings 220 are rotatably connected to a spherical valve core 240, and the valve stems of the plurality of spherical valve cores 240 are all fixedly connected to a first gear 230; two transmission wheels 250 are rotatably connected to the outer wall of the mud storage tank 100, and a first belt 260 is transmission-connected between the two transmission wheels 250, and the first belt 260 is provided with teeth 261. When the transmission wheel 250 rotates, the teeth 261 engage with the plurality of first gears 230 in turn to drive the plurality of first gears 230 to rotate 360 ​​degrees in turn, so that the plurality of branch pipes 210 are connected to the mud storage tank 100 in turn.

[0044] The mud storage tank 100 is placed horizontally, and a feed pipe 110 and multiple branch pipes 210 are connected on the side wall. The feed pipe 110 and the multiple branch pipes 210 are symmetrically arranged, with the feed pipe 110 at the upper part and the multiple branch pipes 210 at the lower part. The mud after gel breaking is transported into the mud storage tank 100 through the feed pipe 110. After standing, the mud is stratified and the large particles of the mud settle at the lower part. The transmission wheel 250 is controlled to rotate so that the first belt 260 is in a transmission state. The teeth 261 on the first belt 260 are engaged with the multiple first gears 230 in turn, and respectively drive the multiple first gears 230 to rotate 360 ​​degrees in sequence. Therefore, the spherical valve core 240 can rotate 360 ​​degrees, so that the corresponding branch pipe 210 is opened and then closed, and multiple branch pipes 210 are opened in turn, so that the mud deposited at the bottom of the horizontal mud storage tank 100 is discharged evenly in the horizontal direction, avoiding the situation where the mud in a fixed place is continuously discharged and the mud with larger particle size in other horizontal positions cannot be discharged. That is, by setting up multiple branch pipes 210 to open and discharge mud in sequence, the mud with large particles in the bottom layer can be discharged before the mud with smaller particle size in the upper layer is discharged, which is convenient for subsequent filter press dehydration operations, and is also beneficial for the classification and reuse of mud with different particle sizes after dehydration.

[0045] The transmission wheel 250 includes two limiting plates 252 and a second gear 251 . The two limiting plates 252 are coaxially connected to two end surfaces of the second gear 251 , and the first belt 260 is embedded between the two limiting plates 252 .

[0046] The two symmetrically arranged limit plates 252 make it difficult for the first belt 260 to be separated from the transmission connection with the second gear 251. When the second gear 251 rotates, when the teeth 261 on the first belt 260 move to the second gear 251, they can be embedded in the teeth 261 of the second gear 251, and the tooth tops of the second gear 251 are in close contact with the rest of the first belt 260 to ensure the transmission effect.

[0047] The device further includes a bracket 120 fixedly connected to the mud storage tank 100 , a motor 300 fixedly connected to the bracket 120 , a piston pump 310 fixedly connected to the output end of the motor 300 , and the piston pump 310 connected to the mud output pipe 200 .

[0048] The setting of the bracket 120 supports the mud storage tank 100. When the motor 300 is running, the piston pump 310 is driven to extract the mud in the mud storage tank 100. By changing the running speed of the motor 300, the mud flow in the mud output pipe 200 is increased, thereby changing the pumping pressure of the mud.

[0049] The output end of the motor 300 is fixedly connected to a driving wheel 320 , a driven wheel 330 is coaxially fixedly connected to one of the transmission wheels 250 , and a second belt 340 is transmission-connected between the driving wheel 320 and the driven wheel 330 .

[0050] When the motor 300 is started, it also drives the driving wheel 320 to run, so that the driving wheel 320 drives the driven wheel 330 to rotate, so that the transmission wheel 250 runs to drive multiple branch pipes 210 to connect with the mud storage tank 100 in sequence. In addition, the diameter ratio of the driving wheel 320 and the driven wheel 330 can be set according to the speed parameters of the motor 300 to change the transmission speed. The transmission force of the motor 300 can also be output to the transmission wheel 250 by using structures such as a transmission, so that when the piston pump 310 runs to transport mud, the multiple branch pipes 210 are synchronously connected to the mud storage tank 100 in turn.

[0051] The end of the mud output pipe 200 away from the mud storage tank 100 is connected to a switching pipe 420, and the two ends of the switching pipe 420 are respectively connected to the first filter press 500 and the second filter press 600. The mud output pipe 200 is connected to a particle size analyzer 400, and an electromagnetic three-way valve 410 is provided at the connection between the mud output pipe 200 and the switching pipe 420. When the particle size analyzer 400 detects that the mud particle size in the mud output pipe 200 is large, the electromagnetic three-way valve 410 operates to allow the mud to be transported to the first filter press 500.

[0052] The particle size analyzer 400 monitors the particle size of the mud in the mud output pipe 200 online, and the control system obtains the detection value of the particle size analyzer 400 and compares the detection value with the preset particle size value. When the detection value is greater than the preset value, the control system controls the electromagnetic three-way valve 410 to operate, so that the mud is transported to the first filter press 500, and the first filter press 500 filters the mud with larger particle size. Conversely, the electromagnetic three-way valve 410 operates, so that the mud with smaller particle size is transported to the second filter press 600, and the second filter press 600 filters the mud with smaller particle size.

[0053] The mesh number of the filter cloth of the first filter press 500 is smaller than the mesh number of the filter cloth of the second filter press 600.

[0054] The filter cloth of the first filter press 500 can be 120 mesh (pore size 125 μm), which can effectively intercept coarse particles and avoid pore blockage. The filter cloth of the second filter press 600 can be 500 mesh (pore size 25 μm).

[0055] In addition, a filter press can be set up according to the mud particle size detected during actual use. This filter press is used to filter the medium-particle mud, and the system operating parameters can be adjusted according to the above operating logic.

[0056] Both ends of the switching tube 420 are connected to vertical tubes 430, and the two vertical tubes 430 are connected to horizontal tubes 440. The two horizontal tubes 440 are respectively connected to the first filter press 500 and the second filter press 600; it also includes two material barrels 700, and material tubes 710 are connected between the two material barrels 700 and the two horizontal tubes 440. Counterweight columns 720 are slidably connected in the two material barrels 700, and the counterweight columns 720 are in contact with the inner wall of the material barrel 700.

[0057] Polyaluminum chloride (PAC) or polyacrylamide (PAM), and diatomaceous earth or perlite are placed in the two material barrels 700 respectively. Polyaluminum chloride (PAC) or polyacrylamide (PAM) modifies the surface of coarse particles and aggregates them into more uniform agglomerates, improving the filter cake structure and avoiding looseness; diatomaceous earth or perlite forms a "filter-aid layer" on the surface of the filter cloth to prevent fine particles from directly clogging the filter holes and at the same time speeding up the filtration speed. The aforementioned added materials are diluted with water to become easy-to-flow state. The counterweight column 720 moves downward in the material barrel 700 by its weight, so that the material in the material barrel 700 can be discharged.

[0058] A lifting rod 740 is slidably connected inside the vertical tube 430, and a mounting block 730 is fixedly connected to the top of the lifting rod 740. An inclined groove 733 is provided on the mounting block 730. A material baffle plate 760 is radially inserted into the material tube 710, and a slide rod 770 is fixedly connected to the end of the material baffle plate 760. The slide rod 770 is slidably connected in the inclined groove 733; an N-shaped frame 780 is fixedly connected to the material barrel 700, and two horizontal bars 781 are fixedly connected to the N-shaped frame 780, and the material baffle plate 760 is slidably connected between the two horizontal bars 781.

[0059] After the material is output through the mud output pipe 200, it flows into the switching pipe 420, and then flows into the vertical pipe 430 through the switching pipe 420, and then enters the corresponding filter press through the horizontal pipe 440 for pressure filtration and dehydration. In the initial state, the lifting rod 740 is in the connecting position between the vertical pipe 430 and the horizontal pipe 440, so that the vertical pipe 430 and the horizontal pipe 440 are not connected. After the mud enters the vertical pipe 430, it pushes the lifting rod 740 to move upward, so that the vertical pipe 430 can be connected with the horizontal pipe 440. At this time, the mud is discharged to In the corresponding filter press, when the lifting rod 740 moves upward, it drives the mounting block 730 to move upward synchronously, so that the slide rod 770 slides in the inclined slide groove 733 on the mounting block 730, and the baffle plate 760 is limited by the two horizontal bars 781, so that the upward movement of the mounting block 730 drives the baffle plate 760 to move away from the material pipe 710, so that the material pipe 710 is opened, so that the material in the material barrel 700 enters the horizontal pipe 440 through the material pipe 710 and mixes with the mud, thereby optimizing the subsequent filtration effect;

[0060] In addition, the greater the flow in the vertical pipe 430, the greater the pressure, the greater the upward movement distance of the lifting rod 740, which increases the opening of the material pipe 710, so that the material barrel 700 can output an appropriate amount of modified material to the mud;

[0061] The composition and concentration of the modified material can be changed according to the needs, and it can be omitted if not needed.

[0062] A rectangular plate 750 is fixedly connected to the two material barrels 700, and a guide rod 731 is fixedly connected to the mounting block 730. The guide rod 731 passes through the rectangular plate 750, and a spring 732 is connected between the rectangular plate 750 and the mounting block 730. Solenoid valves 421 are provided at both ends of the switching tube 420. When the first filter press 500 or the second filter press 600 on the same side of the solenoid valve 421 is not in operation, the corresponding solenoid valve 421 is opened to relieve the pressure of the corresponding vertical pipe 430; a speed control switch 791 is provided on the lower surface of the two rectangular plates 750, and a pressing column 790 cooperating with the two speed control switches 791 is connected to the two mounting blocks 730. The speed control switch 791 close to the first filter press 500 is used to control the speed of the motor 300 to decrease, and the speed control switch 791 close to the second filter press 600 is used to control the speed of the motor 300 to increase.

[0063] To ensure that the corresponding material pipe 710 can be closed when the corresponding filter press is not in operation, the control system controls the operation of the electromagnetic three-way valve 410 to change the flow direction of the mud. The electromagnetic valve 421 at the end of the switching pipe 420 where no mud flows is opened, and the excess mud flows out through the end of the switching pipe 420 for collection. At this time, the vertical pipe 430 at this end can relieve pressure, so that the spring 732 drives the lifting rod 740 to move down and reset, so that the corresponding material baffle 760 slides in the opposite direction to block the corresponding material pipe 710, thereby avoiding waste of material in the corresponding material barrel 700.

[0064] In addition, the counterweight column 720 can be made of ferromagnetic material. To ensure that the gravity of the counterweight column 720 is transmitted to the vertical pipe 430 and the pressure in the vertical pipe 430 is increased, an electromagnet is provided on the N-shaped frame 780 to attract the counterweight column 720 and prevent it from moving downward. When the solenoid valve 421 is opened, the electromagnet on the same side is turned on to offset the influence of the gravity of the counterweight column 720.

[0065] Mud of different particle sizes requires different delivery pressures during filtration. To prevent large-particle mud from clogging the center hole of the first filter press 500, it is necessary to reduce the mud pressure. The corresponding mounting block 730 moves upward, and the pressing column 790 on its top can press the speed control switch 791 that controls the motor 300 to reduce the speed, thereby reducing the mud delivery pressure.

[0066] When small-particle mud is transported to the second filter press 600, the pressure needs to be increased to force the filtrate to pass through the filter cloth and reduce the accumulation of fine particles on the surface of the filter cloth. At this time, the corresponding mounting block 730 moves up, and the pressing column 790 on its top can press the speed control switch 791 to increase the speed of the motor 300, thereby increasing the mud delivery pressure.

[0067] A method for harmlessly treating waste drilling mud, using the above-mentioned harmless treatment system for waste drilling mud, comprises the following steps:

[0068] The mud from the drilling site is transported to the factory mud storage pool for temporary storage and tempering agent is added for mixing;

[0069] The prepared mud is transferred to the mud storage tank 100, and the mud storage tank 100 transports muds of different particle sizes to the first filter press 500 and the second filter press 600 for dehydration;

[0070] The material dehydrated by the second filter press 600 is a dry material. The biodegradable material is added to the dry material and mixed thoroughly. After the dry material is stacked and allowed to stand, the organic matter therein is decomposed into carbon dioxide and water, forming harmless nutrient soil and green soil.

[0071] The material dehydrated by the first filter press 500 is a solid phase material. A curing agent is added to the solid phase material, and the mixed material is sent to the main mold cavity of the static pressure curing equipment. The solidified material after pressure curing is sent to the stabilization curing area. After passing the inspection during the curing period, it can be used to make building materials.

[0072] Sewage treatment: The wastewater separated by filtration and the domestic sewage introduced from outside the factory are mixed in a mixing and regulating tank, and appropriate amount of reagents are added to adjust the pH value of the sewage to the process technology design requirements;

[0073] The regulated sewage enters the anaerobic tank for anaerobic reaction;

[0074] The sewage after anaerobically treated enters the anoxic tank for anoxic reaction;

[0075] The sewage treated with anoxic treatment enters the aerobic tank for aerobic reaction;

[0076] A small amount of mixed liquid from the aerobic tank flows back to the anoxic tank to continue participating in anoxic and aerobic reactions. The remaining sewage enters the sedimentation tank for sedimentation. The purified water after sedimentation enters the clean water tank. Part of the sludge flows back to the anaerobic tank to continue participating in anaerobic, anoxic and aerobic reactions. The remaining sludge enters the slurry tank.

[0077] The sludge with a moisture content of more than 99% is dehydrated to form a solid state and then transported out;

[0078] The purified water enters the sampling pool after being temporarily stored in the purification pool and the transition pool;

[0079] Sampling is taken from the sampling pool for outflow water quality testing.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A harmless treatment system for drilling waste mud, comprising a horizontally placed mud storage tank (100), characterized in that: The mud storage tank (100) is connected to a plurality of branch pipes (210) arranged in a linear array, the plurality of branch pipes (210) are commonly connected to a mud output pipe (200), the plurality of branch pipes (210) are all connected to a valve housing (220), a spherical valve core (240) is rotatably connected to the interior of the plurality of valve housings (220), and the valve stems of the plurality of spherical valve cores (240) are all fixedly connected to a first gear (230); Two transmission wheels (250) are rotatably connected to the outer wall of the mud storage tank (100), and a first belt (260) is transmission-connected between the two transmission wheels (250). The first belt (260) is provided with teeth (261). When the transmission wheel (250) rotates, the teeth (261) engage with the plurality of first gears (230) in turn to drive the plurality of first gears (230) to rotate 360 ​​degrees in turn, so that the plurality of branch pipes (210) are communicated with the mud storage tank (100) in turn. One end of the mud output pipe (200) away from the mud storage tank (100) is connected to a switching pipe (420), and both ends of the switching pipe (420) are respectively connected to a first filter press (500) and a second filter press (600). The mud output pipe (200) is connected to a particle size analyzer (400), and an electromagnetic three-way valve (410) is provided at the connection between the mud output pipe (200) and the switching pipe (420).

2. The harmless treatment system for drilling waste mud according to claim 1 is characterized in that: The transmission wheel (250) comprises two limiting plates (252) and a second gear (251), the two limiting plates (252) are coaxially connected to two end surfaces of the second gear (251), and the first belt (260) is embedded between the two limiting plates (252).

3. The harmless treatment system for waste drilling mud according to claim 1 is characterized in that: It also includes a bracket (120) fixedly connected to the mud storage tank (100), a motor (300) fixedly connected to the bracket (120), an output end of the motor (300) fixedly connected to a piston pump (310), and the piston pump (310) connected to the mud output pipe (200).

4. The harmless treatment system for drilling waste mud according to claim 3 is characterized in that: The output end of the motor (300) is fixedly connected to a driving wheel (320), a driven wheel (330) is coaxially fixedly connected to one of the transmission wheels (250), and a second belt (340) is transmission-connected between the driving wheel (320) and the driven wheel (330).

5. The harmless treatment system for drilling waste mud according to claim 3 is characterized in that: When the particle size analyzer (400) detects that the slurry particle size in the slurry output pipe (200) is large, the electromagnetic three-way valve (410) operates to allow the slurry to be transported to the first filter press (500).

6. The harmless treatment system for drilling waste mud according to claim 5, characterized in that: The mesh number of the filter cloth of the first filter press (500) is smaller than the mesh number of the filter cloth of the second filter press (600).

7. The harmless treatment system for drilling waste mud according to claim 5, characterized in that: Both ends of the switching tube (420) are connected to vertical tubes (430), and both vertical tubes (430) are connected to horizontal tubes (440), and the two horizontal tubes (440) are respectively connected to the first filter press (500) and the second filter press (600); It also includes two ginseng material barrels (700), each of which is connected to the two transverse tubes (440) by a ginseng material tube (710), and each of the two ginseng material barrels (700) is slidably connected to a counterweight column (720), and the counterweight column (720) is in contact with the inner wall of the ginseng material barrel (700).

8. The harmless treatment system for waste drilling mud according to claim 7, characterized in that: A lifting rod (740) is slidably connected in the vertical tube (430), a mounting block (730) is fixedly connected to the top of the lifting rod (740), an inclined sliding groove (733) is provided on the mounting block (730), a material blocking plate (760) is radially inserted into the material tube (710), an end of the material blocking plate (760) is fixedly connected to a sliding rod (770), and the sliding rod (770) is slidably connected in the inclined sliding groove (733); The material barrel (700) is fixedly connected to an N-shaped frame (780), and two horizontal bars (781) are fixedly connected to the N-shaped frame (780). The material blocking plate (760) is slidably connected between the two horizontal bars (781).

9. The harmless treatment system for waste drilling mud according to claim 8, characterized in that: A rectangular plate (750) is fixedly connected to each of the two material barrels (700), a guide rod (731) is fixedly connected to the mounting block (730), the guide rod (731) passes through the rectangular plate (750), and a spring (732) is connected between the rectangular plate (750) and the mounting block (730), and solenoid valves (421) are provided at both ends of the switching tube (420), and when the first filter press (500) or the second filter press (600) on the same side as the solenoid valve (421) is not in operation, the corresponding solenoid valve (421) is opened to relieve pressure in the corresponding vertical pipe (430); The lower surfaces of the two rectangular plates (750) are both provided with speed regulating switches (791), and the two mounting blocks (730) are both connected with pressing columns (790) that cooperate with the two speed regulating switches (791). The speed regulating switch (791) close to the first filter press (500) is used to control the speed of the motor (300) to decrease, and the speed regulating switch (791) close to the second filter press (600) is used to control the speed of the motor (300) to increase.

10. A method for harmless treatment of drilling waste mud, using the harmless treatment system for drilling waste mud according to claim 9, characterized in that: The following steps are involved: The mud from the drilling site is transported to the factory mud storage pool for temporary storage and tempering agent is added for mixing; The prepared mud is transferred to a mud storage tank (100), and the mud storage tank (100) transports muds of different particle sizes to a first filter press (500) and a second filter press (600) for dehydration; The material dehydrated by the second filter press (600) is a dry material, and the biodegradable material is added to the dry material and fully mixed. After the dry material is stacked and allowed to stand, the organic matter therein is decomposed into carbon dioxide and water, forming harmless nutrient soil and green soil; The material dehydrated by the first filter press (500) is a solid phase material, a curing agent is added to the solid phase material, the mixed material is sent to the main mold cavity of the static pressure curing equipment, the solidified material after pressure curing is sent to the stabilization curing area, and is used to make building materials after passing the inspection during the curing period; Sewage treatment: The wastewater separated by filtration and the domestic sewage introduced from outside the factory are mixed in a mixing and regulating tank, and appropriate amount of reagents are added to adjust the pH value of the sewage to the process technology design requirements; The regulated sewage enters the anaerobic tank for anaerobic reaction; The sewage after anaerobically treated enters the anoxic tank for anoxic reaction; The sewage treated with anoxic treatment enters the aerobic tank for aerobic reaction; A small amount of mixed liquid from the aerobic tank flows back to the anoxic tank to continue participating in anoxic and aerobic reactions. The remaining sewage enters the sedimentation tank for sedimentation. The purified water after sedimentation enters the clean water tank. Part of the sludge flows back to the anaerobic tank to continue participating in anaerobic, anoxic and aerobic reactions. The remaining sludge enters the slurry tank. The sludge with a moisture content of more than 99% is dehydrated to form a solid state and then transported out; The purified water enters the sampling pool after being temporarily stored in the purification pool and the transition pool; Sampling is taken from the sampling pool for outflow water quality testing.

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