Harmless treatment system and method for waste drilling mud

Abstract

The invention discloses a harmless treatment system and method for waste drilling mud, and belongs to the field of drilling mud treatment. The system comprises a transverse slurry storage tank, the slurry storage tank communicates with a plurality of branch pipes arranged in a linear array mode, the branch pipes jointly communicate with a slurry output pipe, the branch pipes communicate with valve shells, the valve shells are internally and rotatably connected with spherical valve elements, and valve rods of the spherical valve elements are fixedly connected with first gears; two transmission wheels are rotationally connected to the outer wall of the slurry storage tank, a first belt is in transmission connection between the two transmission wheels, teeth are arranged on the first belt, and when the transmission wheels rotate, the teeth are engaged with the multiple first gears in turn to drive the multiple first gears to rotate by 360 degrees in turn, so that the multiple branch pipes communicate with the slurry storage tank in turn; according to the method, the solid phase can be recycled after the mud on the drilling site is dewatered; the system can uniformly discharge slurry with relatively consistent particle size, so that the subsequent slurry treatment work is facilitated.

Description

Technical Field

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

[0002] With the rapid development of the oil and gas industry, the harmless treatment of drilling waste mud has become an important topic in the environmental protection field. Drilling waste mud usually contains a large amount of clay, cuttings, chemical additives and harmful substances (such as heavy metals, petroleum), and if directly discharged, it will cause serious pollution to the soil and water bodies. Therefore, how to efficiently separate the solid and liquid phases in the mud and classify and treat the solid phase particles of different particle sizes has become a key technical challenge in this field.

[0003] Traditional mud treatment systems mostly adopt a single discharge port design, and the following problems are likely to occur when discharging mud: Low separation efficiency due to uneven particle size distribution: After the mud stands still in the storage tank, it will naturally stratify, with large particles settling to the bottom and small particles suspended in the upper layer. If discharged only from a fixed position, it will cause insufficient discharge of the large-particle mud at the bottom and premature mixing of the fine-particle mud in the upper layer, affecting the subsequent pressure filtration and dehydration effect; Filter cloth blockage and high treatment cost: When the unclassified mixed-particle-size mud directly enters the pressure filtration process, fine particles (such as colloidal substances) are likely to block the pores of the filter cloth, reducing the filtration speed and increasing equipment wear and operating costs; Limited resource utilization: Mud particles of different particle sizes have different uses in subsequent treatment (for example, coarse particles can be used as building materials, and fine particles can be used for soil improvement), and traditional treatment methods are not easy to achieve targeted classification and reuse. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides the following technical solution: A harmless treatment system for drilling waste mud, including a horizontally placed mud storage tank, a plurality of branch pipes arranged in a linear array are connected to the mud storage tank, the plurality of branch pipes are commonly connected to a mud output pipe, valve housings are connected to the plurality of branch pipes, spherical valve cores are rotatably connected in the plurality of valve housings, and first gears are fixedly connected to the valve stems of the plurality of spherical valve cores; Two transmission wheels are rotatably connected to the outer wall of the mud storage tank, a first belt is connected between the two transmission wheels, teeth are arranged on the first belt, when the transmission wheels rotate, the teeth are alternately engaged with the plurality of first gears to drive the plurality of first gears to alternately rotate 360 degrees, so that the plurality of branch pipes are alternately connected to the mud storage tank.

[0006] Preferably, the driving 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.

[0007] Preferably, it further includes a bracket fixedly connected to the mud storage tank. A motor is fixedly connected to the bracket, and an output end of the motor is fixedly connected to a piston pump. The piston pump is connected to the mud output pipe.

[0008] Preferably, an output end of the motor is fixedly connected to a driving wheel, and a driven wheel is coaxially and fixedly connected to one of the driving wheels. A second belt is connected between the driving wheel and the driven wheel for transmission.

[0009] Preferably, one end of the mud output pipe away from the mud storage tank is communicated with a switching pipe. Two ends of the switching pipe are respectively connected to a first filter press and a second filter press. A particle size analyzer is connected to the mud output pipe. An electromagnetic three-way valve is arranged at a connection part between the mud output pipe and the switching pipe. When the particle size analyzer detects that the particle size of the mud in the mud output pipe is large, the electromagnetic three-way valve operates to convey the mud to the first filter press.

[0010] Preferably, the mesh number of the filter cloth of the first filter press is smaller than that of the filter cloth of the second filter press.

[0011] Preferably, two ends of the switching pipe are both communicated with vertical pipes. Horizontal pipes are both communicated with the two vertical pipes. The two horizontal pipes are respectively connected to the first filter press and the second filter press; It further includes two material adding cylinders. Material adding pipes are connected between the two material adding cylinders and the two horizontal pipes respectively. Counterweight columns are slidably connected in the two material adding cylinders, and the counterweight columns are in fit with the inner walls of the material adding cylinders.

[0012] Preferably, a lifting rod is slidably connected in the vertical pipe. The top of the lifting rod is fixedly connected to a mounting block. An inclined sliding groove is formed in the mounting block. A baffle is radially inserted into the material adding pipe. An end of the baffle is fixedly connected to a sliding rod, and the sliding rod is slidably connected in the inclined sliding groove; An N-shaped frame is fixedly connected to the material adding cylinder. Two cross bars are fixedly connected to the N-shaped frame, and the baffle is slidably connected between the two cross bars.

[0013] Preferably, rectangular plates are fixedly connected to the two material adding cylinders respectively. A guide rod is fixedly connected to the mounting block. The guide rod penetrates through the rectangular plate, and a spring is connected between the rectangular plate and the mounting block. Solenoid valves are arranged at two ends of the switching pipe. When the first filter press or the second filter press on the same side as the solenoid valve is not operating, the corresponding solenoid valve is opened to relieve pressure in the corresponding vertical pipe; 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.

[0014] A method for harmlessly treating waste drilling mud, using the above-mentioned harmless treatment system for waste drilling mud, comprises the following steps: 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 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; 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. 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. 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.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the teeth on the first belt engage with a plurality of first gears in turn, and respectively drive the plurality of first gears to rotate 360 degrees in sequence, so that the spherical valve core can rotate 360 degrees, enabling the corresponding branch pipes to open and then close. The sequential opening of the multiple branch pipes causes the mud deposited at the lower part of the horizontally placed mud storage tank to be evenly discharged laterally, preventing the mud with larger particle size at other lateral positions from not being discharged after the mud at a fixed location is continuously discharged. That is, by arranging the multiple branch pipes to discharge mud in sequence, the mud with larger particles at the bottom layer can be partially discharged first, and then the mud with smaller particle size at the upper layer will be discharged, which facilitates the subsequent operation of pressure filtration and dehydration, and is also beneficial for the classified reuse of different particle size muds after dehydration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure at the mud output pipe of the present invention; Figure 3 is a schematic diagram of the structure at the piston pump of the present invention; Figure 4 is a schematic diagram of the structure of the spherical valve core of the present invention; Figure 5 is a schematic diagram of the structure of the transmission wheel of the present invention; Figure 6 is a schematic diagram of the structure at the switching pipe of the present invention; Figure 7 is a schematic diagram of the structure at the baffle of the present invention; Figure 8 is a schematic diagram of the structure at the speed control switch of the present invention.

[0017] In the figure: 100, mud storage tank; 110, feed pipe; 120, support; 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 three-way valve; 420, switching pipe; 421, solenoid valve; 430, vertical pipe; 440, horizontal pipe; 500, first filter press; 600, second filter press; 700, reference material cylinder; 710, reference material pipe; 720, counterweight column; 730, mounting block; 731, guide rod; 732, spring; 733, inclined chute; 740, lifting rod; 750, rectangular plate; 760, baffle; 770, slide bar; 780, N-shaped frame; 781, cross bar; 790, pressing column; 791, speed control switch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Referring to 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. A plurality of branch pipes 210 arranged in a linear array are communicated with the mud storage tank 100. The plurality of branch pipes 210 are jointly communicated with a mud output pipe 200. A valve housing 220 is communicated with each of the plurality of branch pipes 210. A spherical valve core 240 is rotatably connected in each of the plurality of valve housings 220. A first gear 230 is fixedly connected to the valve stem of each of the plurality of spherical valve cores 240. Two transmission wheels 250 are rotatably connected to the outer wall of the mud storage tank 100. A first belt 260 is connected between the two transmission wheels 250. Teeth 261 are provided on the first belt 260. When the transmission wheel 250 rotates, the teeth 261 are alternately engaged with the plurality of first gears 230 to drive the plurality of first gears 230 to rotate 360 degrees in turn, so that the plurality of branch pipes 210 are alternately communicated with the mud storage tank 100.

[0020] The mud storage tank 100 is placed horizontally, and a feed pipe 110 and a plurality of branch pipes 210 are communicated on the side wall. The feed pipe 110 and the plurality of branch pipes 210 are symmetrically arranged. The feed pipe 110 is located in the upper part, and the plurality of branch pipes 210 are located in the lower part. The broken gel mud is conveyed 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 in the lower part. The transmission wheel 250 is controlled to rotate so that the first belt 260 is in a driving state. The teeth 261 on the first belt 260 are alternately engaged with the plurality of first gears 230 and respectively drive the plurality of first gears 230 to rotate 360 degrees in turn. Thus, the spherical valve core 240 can rotate 360 degrees, so that the corresponding branch pipe 210 is opened and then closed. The alternating opening of the plurality of branch pipes 210 enables the mud deposited in the lower part of the horizontally placed mud storage tank 100 to be evenly discharged laterally, avoiding the situation that the mud with larger particle size at other lateral positions cannot be discharged after the mud at a fixed position is continuously discharged. That is, by setting the plurality of branch pipes 210 to alternately open and discharge the mud, it can be ensured that the mud with larger particles at the bottom layer is partially discharged before the mud with smaller particle size at the upper layer is discharged, which is convenient for subsequent pressure filtration and dehydration operations and is also beneficial for the classified reuse of different particle size muds after dehydration.

[0021] The driving wheel 250 includes two limiting plates 252 and a second gear 251. The two limiting plates 252 are coaxially connected to the two end faces of the second gear 251 respectively, and the first belt 260 is embedded between the two limiting plates 252.

[0022] The two symmetrically arranged limiting plates 252 prevent the first belt 260 from easily disengaging from the driving 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 into the teeth 261 of the second gear 251, while the tooth tips of the second gear 251 are in close contact with the rest of the first belt 260 to ensure the driving effect.

[0023] It also includes a bracket 120 fixedly connected to the mud storage tank 100. A motor 300 is fixedly connected to the bracket 120. The output end of the motor 300 is fixedly connected to a piston pump 310, and the piston pump 310 is connected to the mud output pipe 200.

[0024] The setting of the bracket 120 supports the mud storage tank 100. When the motor 300 operates, it drives the piston pump 310 to operate to extract the mud in the mud storage tank 100. By changing the operating speed of the motor 300, the mud flow rate in the mud output pipe 200 is increased, thereby changing the mud pumping pressure.

[0025] The output end of the motor 300 is fixedly connected to a driving wheel 320. A driven wheel 330 is coaxially and fixedly connected to one of the driving wheels 250. A second belt 340 is connected between the driving wheel 320 and the driven wheel 330.

[0026] When the motor 300 starts, it drives the driving wheel 320 to operate at the same time. Thus, the driving wheel 320 drives the driven wheel 330 to rotate, causing the driving wheel 250 to operate to drive the multiple branch pipes 210 to communicate 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 rotation speed parameter of the motor 300 to change the driving speed. Also, a transmission or other structure can be used to output the driving force of the motor 300 to the driving wheel 250, so that when the piston pump 310 operates for mud transportation, the multiple branch pipes 210 perform synchronous alternate communication actions with the mud storage tank 100.

[0027] One end of the mud output pipe 200 far from the mud storage tank 100 is connected to a switching pipe 420. The two ends of the switching pipe 420 are respectively connected to a first filter press 500 and a second filter press 600. A particle size analyzer 400 is connected to the mud output pipe 200. An electromagnetic three-way valve 410 is arranged at the connection between the mud output pipe 200 and the switching pipe 420. When the particle size analyzer 400 detects that the particle size of the mud in the mud output pipe 200 is large, the electromagnetic three-way valve 410 operates to convey the mud to the first filter press 500.

[0028] The particle size analyzer 400 monitors the particle size of the mud in the mud output pipe 200 online. The control system obtains the detection value of the particle size analyzer 400, 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. On the contrary, 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.

[0029] The mesh number of the filter cloth of the first filter press 500 is less than that of the second filter press 600.

[0030] The mesh number of the filter cloth of the first filter press 500 can be selected as 120-mesh filter cloth (pore diameter 125μm), which can effectively intercept coarse particles and avoid pore blockage at the same time. The mesh number of the filter cloth of the second filter press 600 can be selected as 500-mesh filter cloth (pore diameter 25μm); In addition, a filter press can also be set according to the particle size of the mud detected during actual use. This filter press is used to filter the medium-particle mud, and the operating parameters of the system can be adjusted adaptively according to the above operating logic.

[0031] Both ends of the switching pipe 420 are connected with vertical pipes 430, and horizontal pipes 440 are connected to both vertical pipes 430. The two horizontal pipes 440 are respectively connected to the first filter press 500 and the second filter press 600; It also includes two dosing cylinders 700. Dosing pipes 710 are connected between the two dosing cylinders 700 and the two horizontal pipes 440. Counterweight columns 720 are slidably connected in the two dosing cylinders 700, and the counterweight columns 720 are in contact with the inner walls of the dosing cylinders 700.

[0032] Poly aluminum chloride (PAC) or polyacrylamide (PAM), and diatomaceous earth or perlite are respectively placed in the two dosing cylinders 700. Poly aluminum chloride (PAC) or polyacrylamide (PAM) modifies the surface of the 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, preventing fine particles from directly blocking the filter pores and accelerating the filtration speed at the same time. The aforementioned added materials are all diluted with water to be in an easily flowing state, and the counterweight columns 720 move downward in the dosing cylinders 700 by virtue of their weight, so that the materials in the dosing cylinders 700 can be discharged.

[0033] A lifting rod 740 is slidably connected inside the vertical pipe 430. A mounting block 730 is fixedly connected to the top of the lifting rod 740. An inclined sliding groove 733 is formed in the mounting block 730. A baffle plate 760 is radially inserted into the feeding pipe 710. A sliding rod 770 is fixedly connected to the end of the baffle plate 760. The sliding rod 770 is slidably connected inside the inclined sliding groove 733. An N-shaped frame 780 is fixedly connected to the feeding cylinder 700. Two cross bars 781 are fixedly connected to the N-shaped frame 780. The baffle plate 760 is slidably connected between the two cross bars 781.

[0034] After the material is output through the mud output pipe 200, it flows into the switching pipe 420, 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 located at the connecting part of the vertical pipe 430 and the horizontal pipe 440, so that the vertical pipe 430 is not connected to the horizontal pipe 440. 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 to the horizontal pipe 440. At this time, the mud is discharged into the corresponding filter press. When the lifting rod 740 moves upward, it drives the mounting block 730 to move upward synchronously, so that the sliding rod 770 slides in the inclined sliding groove 733 on the mounting block 730, and the baffle plate 760 is limited by the two cross bars 781. Furthermore, the upward movement of the mounting block 730 drives the baffle plate 760 to move away from the feeding pipe 710, so that the feeding pipe 710 is opened, and the material in the feeding cylinder 700 enters the horizontal pipe 440 through the feeding pipe 710 and is mixed with the mud to optimize the subsequent pressure filtration effect. In addition, the greater the flow rate in the vertical pipe 430, the greater the pressure and the greater the upward movement distance of the lifting rod 740, which also increases the opening degree of the feeding pipe 710, so that the feeding cylinder 700 can output a suitable amount of modified material to the mud. The composition and concentration of the modified material can be changed according to requirements, or it can be not added if not needed.

[0035] Rectangular plates 750 are fixedly connected to both feeding cylinders 700. A guide rod 731 is fixedly connected to the mounting block 730. The guide rod 731 penetrates 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 arranged at both ends of the switching pipe 420. When the first filter press 500 or the second filter press 600 on the same side as the solenoid valve 421 is not operating, the corresponding solenoid valve 421 is opened to relieve the pressure of the corresponding vertical pipe 430. Speed regulating switches 791 are arranged on the lower surfaces of the two rectangular plates 750. Pressing columns 790 cooperating with the two speed regulating switches 791 are connected to both mounting blocks 730. The speed regulating switch 791 close to the first filter press 500 is used to control the reduction of the motor 300 speed, and the speed regulating switch 791 close to the second filter press 600 is used to control the increase of the motor 300 speed.

[0036] 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. 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. 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. 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.

[0037] A method for harmlessly treating waste drilling mud, using the above-mentioned harmless treatment system for waste drilling mud, comprises the following steps: 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 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; 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. 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. Sewage treatment: The wastewater separated by pressure filtration and the domestic sewage introduced from outside the factory are mixed in the mixing and regulating tank, and an appropriate amount of reagent is added to mix and regulate the pH value of the sewage to meet the requirements of the process design. The adjusted sewage enters the anaerobic tank for anaerobic reaction. The sewage treated anaerobically enters the anoxic tank for anoxic reaction. The sewage treated anoxically enters the aerobic tank for aerobic reaction. A small amount of the mixed liquid coming out of the aerobic tank is refluxed to the anoxic tank to continue participating in the anoxic and aerobic reactions. The remaining sewage enters the sedimentation tank for sedimentation. The clarified water after sedimentation enters the clean water tank. Part of the sludge is refluxed to the anaerobic tank to continue participating in the anaerobic, anoxic, and aerobic reactions. The remaining sludge enters the slurry tank. The sludge with a moisture content of over 99% is dehydrated to form a solid state and then transported out. The clean water is temporarily stored and transferred through the clean water tank and the transition tank and then enters the sampling tank. Samples are taken from the sampling tank for the detection of the quality of the discharged water.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An innocuous treatment system for drilling waste mud, comprising a horizontally arranged mud storage tank (100), characterized in that: A plurality of branch pipes (210) arranged in a linear array are connected to the mud storage tank (100). The plurality of branch pipes (210) are jointly connected to a mud output pipe (200). Valve housings (220) are connected to each of the plurality of branch pipes (210). A spherical valve core (240) is rotatably connected in each of the plurality of valve housings (220). A first gear (230) is fixedly connected to the valve stem of each of the plurality of spherical valve cores (240). Two transmission wheels (250) are rotatably connected to the outer wall of the mud storage tank (100). A first belt (260) is connected between the two transmission wheels (250). Teeth (261) are provided on the first belt (260). When the transmission wheel (250) rotates, the teeth (261) are alternately engaged with the plurality of first gears (230) to drive the plurality of first gears (230) to rotate 360 degrees alternately, so that the plurality of branch pipes (210) are alternately connected to the mud storage tank (100).

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

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

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

5. The harmless treatment system for drilling waste mud according to claim 3, characterized in that: One end of the mud output pipe (200) away from the mud storage tank (100) is connected to a switching pipe (420). The two ends of the switching pipe (420) are respectively connected to a first filter press (500) and a second filter press (600). A particle size analyzer (400) is connected to the mud output pipe (200). An electromagnetic three-way valve (410) is arranged at the connection between the mud output pipe (200) and the switching pipe (420). When the particle size analyzer (400) detects that the particle size of the mud in the mud output pipe (200) is large, the electromagnetic three-way valve (410) operates to deliver the mud to the first filter press (500).

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

7. The harmless treatment system for drilling waste mud according to claim 5, characterized in that: Vertical pipes (430) are connected to both ends of the switching pipe (420). Horizontal pipes (440) are connected to each of the two vertical pipes (430). The two horizontal pipes (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 drilling waste 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 drilling waste 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 drilling waste mud harmless treatment system described in 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 pressure filtration and the domestic sewage introduced from outside the factory are mixed in the mixing and regulating tank, and an appropriate amount of reagent is added to mix and regulate the pH value of the sewage to meet the requirements of the process technology design; The adjusted sewage enters the anaerobic tank for anaerobic reaction; The sewage treated anaerobically enters the anoxic tank for anoxic reaction; The sewage treated anoxically enters the aerobic tank for aerobic reaction; A small amount of the mixed liquid coming out of the aerobic tank flows back to the anoxic tank to continue participating in the anoxic and aerobic reactions. The remaining sewage enters the sedimentation tank for sedimentation. The clarified water after sedimentation enters the clean water tank. Part of the sludge flows back to the anaerobic tank to continue participating in the anaerobic, anoxic, and aerobic reactions, and the remaining sludge enters the mud tank; The sludge with a moisture content of over 99% is dehydrated to form a solid state and then transported out; The clean water is temporarily stored and transferred through the clean water tank and the transition tank and then enters the sampling tank; Samples are taken from the sampling tank for the detection of the quality of the discharged water.

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