LH-SBM environment-friendly high-performance synthetic base drilling fluid system recycling system and process

Abstract

The application provides an LH-SBM environment-friendly high-performance synthetic base drilling fluid system recycling system and process, and belongs to the technical field of drilling fluids, and solves the problems of single use function, non-recyclability, difficult treatment, serious pollution and difficult discharge of drilling waste liquid and the like of the existing drilling fluid. The application comprises the following steps: mixing raw materials to form a synthetic base drilling fluid system; injecting the high-performance synthetic base drilling fluid system into a well for drilling work, and obtaining a synthetic base drilling mud; preliminarily separating the drilling mud to obtain drilling cuttings liquid and drilling cuttings, and recycling the drilling cuttings liquid into the drilling fluid system; sequentially preheating and heating treating the drilling cuttings to obtain tail gas and solid phase; cooling treating the solid phase to obtain clean soil; dust removing and purifying the tail gas, and then condensing and recycling the tail gas to obtain synthetic base base fluid and gas phase, and recycling and utilizing the synthetic base base fluid; purifying the gas phase through a sedimentation pool, and then obtaining direct discharge gas through a flare or activated carbon adsorption, and directly discharging the direct discharge gas into the atmosphere.

Description

Technical Field

[0001] This invention belongs to the field of drilling fluid technology and relates to an LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling system, particularly an LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process. Background Technology

[0002] A search revealed a drilling fluid recycling system [Application No.: 201510572965.2; Publication No.: CN106522864A]. This system includes a sedimentation tank, a drive pump connected to the sedimentation tank via a transmission pipe, a cooling device, and a filtration device. One end of the transmission pipe near the drive pump is connected to the outlet of the sedimentation tank, and the other end is connected to the inlet of the sedimentation tank. The cooling device includes a cooling chamber, a water storage compartment located on the inner wall of the cooling chamber, and inlet and outlet pipes respectively disposed on both sides of the water storage compartment. Although the drilling waste fluid in the sedimentation tank is recycled after passing through the cooling and filtration devices in this patent, saving resources to some extent, it cannot achieve more effective recycling. Furthermore, the discharged solid and liquid components are highly polluting and environmentally unfriendly, and cannot be directly discharged to the drilling site.

[0003] Based on this, we propose an LH-SBM environmentally friendly high-performance synthetic-based drilling fluid recycling system and process. First, raw materials are mixed to form a high-performance synthetic-based drilling fluid system. This system is then injected into the well for drilling operations, yielding synthetic-based drilling mud. The drilling mud undergoes initial solid-liquid separation to obtain drill cuttings liquid and drilling mud. The drill cuttings liquid recycles within the drilling fluid system. The drilling mud undergoes preheating and heating treatments to obtain exhaust gas and a solid phase. The solid phase is cooled to obtain clean soil. The exhaust gas is purified by dust removal and then condensed and recovered to obtain synthetic-based liquid and a gas phase. The synthetic-based liquid is collected and recycled. The gas phase is purified in a settling tank and then adsorbed by a flare or activated carbon to obtain direct-release gas, which is directly discharged into the atmosphere. This recycling system is designed specifically for the recycling of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid. It not only enables recycling and energy saving and emission reduction but also allows for the direct, pollution-free discharge of purified gas and treated clean soil. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an LH-SBM environmentally friendly high-performance synthetic-based drilling fluid recycling system and process. The technical problem to be solved by this invention is: how to achieve stable and efficient collection, treatment, and resource recycling of synthetic-based drilling fluid systems, and how to effectively separate clean soil and pollution-free exhaust gas that can be directly discharged to the drilling site.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A recycling process for an LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system includes the following steps:

[0007] Step 1: Emulsifiers, thickeners, filtration reducers, activity modifiers, synthetic base fluids, and other additives are mixed to form a high-performance synthetic base drilling fluid system;

[0008] Step 2: Inject the high-performance synthetic-based drilling fluid system into the well to carry out drilling operations. The drilling cuttings are then circulated back out of the wellhead to obtain synthetic-based drilling mud.

[0009] Step 3: The negative pressure pump extracts the synthetic base drilling mud under negative pressure and pumps it into the negative pressure vibrating screen for preliminary solid-liquid separation to obtain drill cuttings liquid and drilling mud. The drill cuttings liquid is treated by sedimentation, and the upper layer of liquid re-enters the drilling fluid system for circulation, while the lower layer settles to obtain drilling mud.

[0010] Step four: Drilling mud is preheated by the feeding preheating mechanism and then enters the double-layer thermal desorption mechanism. The double-layer thermal desorption mechanism is heated indirectly by flame, electromagnetic or molten salt to obtain exhaust gas and solid phase.

[0011] Step 5: The solid phase is cooled by the discharge cooling mechanism to obtain clean soil, which is then placed directly on the ground.

[0012] Step 6: The exhaust gas is purified by a dust collector and then recycled by a condenser to obtain synthetic base liquid and gas phase. The synthetic base liquid is collected in a base liquid container and then mixed to form a synthetic base drilling fluid system for resource recycling.

[0013] Step seven: The gas phase is purified by passing through a sedimentation tank, and then adsorbed by a flare or activated carbon to obtain direct exhaust gas, which is directly released into the atmosphere.

[0014] A cooler is connected between the settling tank and the discharge cooling mechanism. Water pipes are provided between the discharge cooling mechanism and the double-layer thermal desorption mechanism, between the double-layer thermal desorption mechanism and the feeding preheating mechanism, between the feeding preheating mechanism and the settling tank, between the cooler and the condenser, and between the condenser and the settling tank.

[0015] Air guide pipes are provided between the feeding preheating mechanism and the dust collector, between the discharging cooling mechanism and the dust collector, between the double-layer thermal desorption mechanism and the dust collector, and between the condenser and the dust collector.

[0016] The LH-SBM environmentally friendly high-performance synthetic-based drilling fluid recycling system includes a double-layer thermal desorption mechanism. The front of the double-layer thermal desorption mechanism is equipped with a feed preheating mechanism and a discharge cooling mechanism. A dust collector is located at the rear of the double-layer thermal desorption mechanism. A settling tank is located on the side of the double-layer thermal desorption mechanism. A cooler is located at the front of the settling tank. A condenser and a tail gas adsorption mechanism are located at the rear of the settling tank. Water pipes are connected between the cooler and the settling tank, the discharge cooling mechanism, and the condenser. Water pipes are also connected between the double-layer thermal desorption mechanism and the feed preheating mechanism and the discharge cooling mechanism. A gas pipe is connected between the dust collector and the feed preheating mechanism, the double-layer thermal desorption mechanism, the discharge cooling mechanism, and the condenser.

[0017] Using the above structure, a negative pressure pump extracts synthetic-based drilling mud under negative pressure and pumps it into a negative pressure vibrating screen for preliminary solid-liquid separation, obtaining drill cuttings liquid and drilling mud. The drill cuttings liquid undergoes sedimentation treatment, with the upper layer re-entering the drilling fluid system for circulation, while the lower layer settles to obtain drilling mud. The drilling mud is preheated by a feeding preheating mechanism before entering a double-layer thermal desorption mechanism, where it is indirectly heated by flame, electromagnetic, or molten salt to obtain exhaust gas and a solid phase. The solid phase is cooled by a discharge cooling mechanism to obtain clean soil, which is then placed directly on the ground. The exhaust gas is purified by a dust collector and then recovered by a condenser to obtain synthetic-based liquid and a gas phase. The synthetic-based liquid is collected in a base liquid container. The container is recycled and reused as a resource. The gas phase is purified through a settling tank, and then passes through a tail gas adsorption mechanism for activated carbon adsorption and catalytic combustion to obtain direct exhaust gas, which is directly released into the atmosphere. The chiller extracts clean water from the settling tank and cools it to obtain cold water. The cold water is injected into the discharge cooling mechanism and condenser to ensure discharge cooling and gas phase condensation. After heat exchange, the cold water in the discharge cooling mechanism becomes warm water, which then enters the double-layer thermal desorption mechanism to obtain hot water. The hot water enters the feed preheating mechanism to preheat the drilling mud, and the water temperature drops before flowing back into the settling tank. The tail gas generated by the feed preheating mechanism, the double-layer thermal desorption mechanism, and the discharge cooling mechanism is collected and sent to the dust collector for dust removal treatment.

[0018] The feeding preheating mechanism and the discharging cooling mechanism are identical. The discharging cooling mechanism includes a support frame, with an inclined double-layer conveying cylinder fixed at the upper end of the support frame. A spiral conveying rod is rotatably installed inside the double-layer conveying cylinder. An installation box is fixed at the end of the double-layer conveying cylinder, and a conveying motor is fixed inside the installation box. The output shaft of the conveying motor is connected to the end of the spiral conveying rod. The double-layer conveying cylinder is hollow inside. A water inlet pipe and a discharge hopper are provided at the lower end of the double-layer conveying cylinder. A feeding hopper, an air extraction pipe, and a water outlet pipe are sequentially provided at the upper end of the double-layer conveying cylinder. Both the water inlet pipe and the water outlet pipe are connected to the hollow inner cavity of the double-layer conveying cylinder. The feeding hopper, the air extraction pipe, and the discharge hopper are respectively connected to the interior of the double-layer conveying cylinder. The water outlet pipe of the feeding preheating mechanism is connected to the sedimentation tank, and the water inlet pipe of the discharging cooling mechanism is connected to the water outlet of the cooler.

[0019] With the above structure, cold or hot water enters the hollow inner cavity of the double-layer conveying cylinder through the inlet pipe. The material enters the interior of the double-layer conveying cylinder through the feed hopper, where it is heated or cooled. The output shaft of the conveying motor drives the screw conveyor to rotate, conveying the material. The heated or cooled material is discharged from the outlet hopper. The gas generated by the material during the conveying process is extracted by the exhaust pipe for full utilization.

[0020] The double-layer thermal desorption mechanism includes a base, a base frame fixed to the upper end of the base, and support frames one and two respectively fixed to both ends of the base and the base frame. Rotary joints are fixed inside support frames one and two. Roller frames and heating hollow cylinders are fixed to the upper ends of both the base and the base frame. The roller frames and support frames two are located on the same side. A rotary kiln is rotatably mounted between the two rotary joints on the same layer. The rotary kiln abuts against the roller frames at corresponding positions and is located inside the heating hollow cylinder. Electromagnetic heating coils are installed inside each heating hollow cylinder. Water guide pipes are installed on the outer wall of each heating hollow cylinder. The inlet end of the water guide pipe is connected to the outlet pipe of the discharge cooling mechanism, and the outlet end of the water guide pipe is connected to the inlet end of the feed preheating mechanism. Water pipes are connected. A material injection box is fixed to the outer side of support frame one. The material injection box is connected to the rotary joint on the same side. A feeding hopper is fixed to the upper end of the upper material injection box. A discharge box is fixed to the outer side of support frame two. The discharge box is connected to the rotary joint on the same side. A guide pipe is provided between the upper discharge box and the lower material injection box. An air extraction joint is provided on the side of the discharge box. A discharge hopper is provided below the lower discharge box. A drive sprocket is fixed to the outside of the rotary joint. A rotary motor is fixed inside the base. A drive chain is provided between the output shaft of the rotary motor and the drive sprocket. The discharge hopper of the feeding preheating mechanism is located directly above the feeding hopper. The feeding hopper of the discharge cooling mechanism is located directly above the discharge hopper.

[0021] Using the above structure, the output shaft of the rotating motor, through a transmission chain and a transmission sprocket, drives two rotary kilns to rotate between two rotating joints on the same layer. The electromagnetic heating coil heats the two rotary kilns. The preheated drilling mud enters the feeding hopper, passes through the upper injection box, and through the rotating joint into the upper rotary kiln for primary heating. It is then injected into the upper discharge box, and through the guide pipe, through the lower injection box into the lower rotary kiln for secondary heating, resulting in dry powder clean soil. This dry powder is discharged through the lower discharge box and then through the discharge hopper. After being cooled by the discharge cooling mechanism, it is collected and can be placed directly on the ground.

[0022] Warm water enters the water guide pipe through the water outlet pipe of the discharge cooling mechanism and the water inlet end of the guide pipe. The electromagnetic heating coil heats the warm water to obtain hot water. The hot water is injected into the water inlet pipe of the feed preheating mechanism through the water outlet end of the guide pipe to preheat the drilling mud inside the feed preheating mechanism.

[0023] During the drying process, the exhaust gas generated is drawn into a dust collector through an exhaust connector for dust removal.

[0024] The dust collector includes a support frame, inside which two settling cylinders are fixed. Several circumferentially distributed baffles are provided on the outside of the settling cylinders. An air inlet diverter is connected between the two settling cylinders. An air inlet connector is connected to the end of the air inlet diverter. An air guide pipe is provided between the air inlet connector and the exhaust connector and the exhaust pipe. A material collection hopper is provided at the lower end of each of the two settling cylinders. An adjusting air duct is provided at the upper end of each of the two settling cylinders. An air plate adjusting screw is provided inside the adjusting air duct. An air plate is fixed at the lower end of the air plate adjusting screw and is slidably disposed inside the adjusting air duct. An air outlet merging connector is provided between the two adjusting air ducts. An air outlet connector is fixed at the end of the air outlet merging connector.

[0025] With the above structure, the generated exhaust gas is drawn into the inlet joint through the exhaust joint, and then divided into two settling cylinders in equal amounts through the inlet split joint. It works in conjunction with the baffle to settle and remove dust. The settled dust is collected in the hopper and treated periodically. This dust can be discharged directly to the ground. By rotating the wind vane adjusting screw, the height of the wind vane is adjusted, which adjusts the air volume. The gas phase after dust removal is collected through the outlet confluence joint and discharged through the outlet joint into the condenser for base liquid condensation.

[0026] The condenser includes two fixed bases, on which a condenser cylinder is fixed. The ends of the condenser cylinders are symmetrically equipped with an outlet connector and an inlet connector. The inlet connector is connected to the outlet end of the refrigeration unit, and the outlet connector is connected to a sedimentation tank. The interior of the condenser cylinder is equipped with several guide tubes. The end of the condenser cylinder is equipped with a baffle plate, which divides the interior of the end of the condenser cylinder into a flow guiding chamber. The guide tubes are divided into upper and lower groups, with one end of each group connected to a corresponding flow guiding chamber, and the other end of each group connected. The interior of the condenser cylinder is equipped with several alternately distributed semi-circular baffles, which divide the interior of the condenser cylinder into condensation channels. The upper end of the condenser cylinder is equipped with two lifting lugs, a feed connector, and an exhaust pipe. The lower end of the condenser cylinder is equipped with an outlet connector. The feed connector, exhaust pipe, and outlet connector are all connected to the condensation channels. The feed connector is connected to an exhaust connector, and the exhaust pipe is connected to an air pump.

[0027] Using the above structure, cold water enters the guide chamber from the inlet connector, then enters several guide tubes for condensation and heat exchange. Warm water enters another guide chamber, exits from the outlet connector, and flows back into the settling tank for resource recycling. The exhaust gas after dust removal enters the feed connector through the gas outlet connector, enters the condensation channel, and undergoes condensation treatment to obtain synthetic base liquid. The synthetic base liquid is discharged and collected through the discharge connector, and then mixed to form a synthetic drilling fluid system for resource recycling. The air pump draws out the overflow gas phase under negative pressure, extracts it from the exhaust pipe, and pumps it into the settling tank for settling treatment.

[0028] The outer wall of the sedimentation tank is equipped with several one-way air inlet valves. The ends of the one-way air inlet valves extend into the sedimentation tank and are submerged below the water surface. An air outlet connector is fixed on the sedimentation tank, and an air pump is connected to one of the one-way air inlet valves.

[0029] Using the above structure, the air pump injects the overflow gas phase into one of the inlet one-way valve pipes, which is then introduced into the sedimentation tank for tail gas filtration and sedimentation treatment. The inlet one-way valve pipe ensures that only air can enter and no water can enter. The filtered and sedimented gas is discharged from the outlet channel connector into the tail gas adsorption mechanism for final treatment.

[0030] The exhaust gas adsorption mechanism includes a dry filter, an exhaust gas frame, and a negative pressure fan arranged in sequence. The dry filter is equipped with an air inlet pipe connected to an air outlet connector. The exhaust gas frame is equipped with several evenly distributed activated carbon adsorption towers. The dry filter and the lower ends of the activated carbon adsorption towers are connected by an air inlet connecting pipe. The upper ends of the activated carbon adsorption towers are equipped with air outlet pipes, the ends of which are connected to the air inlet of the negative pressure fan. The air outlet of the negative pressure fan is equipped with a smoke exhaust pipe. A catalytic converter is located on the side of the exhaust gas frame. A makeup air fan is located on the side of the catalytic converter. An injection pipe is located between the air outlet of the catalytic converter and the activated carbon adsorption towers. A supplementary inlet pipe is located between the air outlet of the catalytic converter, the activated carbon adsorption towers, and the smoke exhaust pipe.

[0031] With the above structure, the negative pressure fan draws in air at negative pressure, and the filtered gas enters the dry filter through the inlet pipe for further dry filtration. The filtered gas then enters several activated carbon adsorption towers and the exhaust pipe through the inlet connecting pipe. The make-up air fan injects the catalyst from inside the catalytic converter into the activated carbon adsorption towers through the injection pipe for activated carbon adsorption concentration, desorption, and catalytic combustion to obtain clean air. This clean air is then drawn into the negative pressure fan through the outlet pipe and injected into the exhaust pipe for secondary catalysis, ensuring that the exhaust gas is pollution-free and can be directly discharged to the drilling site.

[0032] Compared with existing technologies, the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid recycling system and process have the following advantages:

[0033] A primary solid-liquid separation is achieved through a negative pressure vibrating screen, allowing the liquid to be directly recycled. A combination of a feed preheating mechanism, a double-layer thermal desorption mechanism, and a discharge cooling mechanism enables rapid feeding, secondary solid-liquid separation, and rapid discharge of clean soil. A dust collector rapidly filters and settles the exhaust gas generated during the secondary solid-liquid separation, yielding clean exhaust gas. Simultaneously, the dust collector, feed preheating mechanism, and discharge cooling mechanism work together to collect the gas phase generated during these processes under negative pressure. A condenser and a refrigerator work together to rapidly and stably condense the filtered exhaust gas, yielding the synthetic base liquid and gas phase. The synthetic base liquid is collected in a base liquid container for resource recycling; the gas phase undergoes secondary filtration and purification in a settling tank to obtain a clean gas phase; a water circulation is formed through a cooler, a feed preheating mechanism, a double-layer thermal desorption mechanism, and a discharge cooling mechanism. The discharge cooling mechanism cools the clean soil, and the feed preheating mechanism preheats the drilling mud to ensure the thermal desorption effect and improve the thermal desorption efficiency; the final gas phase undergoes dry filtration, activated carbon adsorption concentration, desorption catalytic combustion, and secondary emission catalysis through a tail gas adsorption mechanism to ensure that the tail gas is pollution-free and can be directly discharged to the drilling site. Attached Figure Description

[0034] Figure 1 This is a process flow diagram of the present invention.

[0035] Figure 2 This is a process diagram for drill cuttings mud treatment in this invention.

[0036] Figure 3 This is a detailed diagram of the drill cuttings mud processing in this invention.

[0037] Figure 4 This is a three-dimensional structural schematic diagram of the drill cuttings mud treatment equipment of the present invention.

[0038] Figure 5 This is a front view structural schematic diagram of the drill cuttings mud treatment equipment in this invention.

[0039] Figure 6 This is a top view schematic diagram of the drill cuttings mud treatment equipment in this invention.

[0040] Figure 7 This is a three-dimensional structural diagram of the discharge cooling mechanism in this invention.

[0041] Figure 8 This is a three-dimensional structural diagram of the double-layer thermal desorption mechanism in this invention.

[0042] Figure 9 This is a front view schematic diagram of the double-layer thermal desorption mechanism in this invention.

[0043] Figure 10 This is a schematic diagram of the dust collector in this invention.

[0044] Figure 11 This is a schematic diagram of the condenser in this invention.

[0045] Figure 12 This is a schematic diagram of the exhaust gas adsorption mechanism in this invention.

[0046] Figure 13 It is formula number 1, density 1.80g / cm3, aging test table at 180℃.

[0047] Figure 14 This is the test table of the anti-rock debris contamination performance of Formula No. 1.

[0048] Figure 15 It is formula number 2, density 2.40g / cm3, aging test table at 160℃.

[0049] Figure 16 This is the test table for the anti-rock debris contamination performance of Formula No. 2.

[0050] Figure 17 This is the test table for the anti-cement pollution performance of formula No. 2.

[0051] Figure 18 This is the test table for the resistance to salt water contamination of formula No. 2.

[0052] Figure 19 It is formula number 3, density 2.72g / cm3, aging test table at 200℃.

[0053] Figure 20 It is formula number 1, density 1.80g / cm3, aging test table at 200℃.

[0054] Figure 21 It is formula number 1, density 1.80g / cm3, aging test table at 220℃.

[0055] Figure 22It is formula number 4, density 2.74g / cm3, aging test table at 240℃.

[0056] In the diagram, 1. Feeding preheating mechanism; 2. Double-layer thermal desorption mechanism; 3. Dust collector; 4. Condenser; 5. Tail gas adsorption mechanism; 6. Settling tank; 7. Refrigerator; 8. Discharge cooling mechanism; 9. Feed hopper; 10. Double-layer conveyor cylinder; 11. Support frame; 12. Water inlet pipe; 13. Discharge hopper; 14. Mounting box; 15. Conveyor motor; 16. Water outlet pipe; 17. Air extraction pipe; 18. Feeding hopper; 19. Support frame one; 20. Heating hollow cylinder; 21. Base frame; 22. Water guide pipe; 23. Base; 24. Rotary joint; 25. Feeding box; 26. Guide pipe; 27. Air extraction joint; 28. Discharge box; 29. ​​Roller frame; 30. Rotary kiln cylinder; 31. Discharge hopper; 32. Drive sprocket. 33. Support frame 2; 34. Air inlet connector; 35. Air inlet diverter connector; 36. Support frame; 37. Settling cylinder; 38. Adjustable air duct; 39. Air vane adjusting screw; 40. Outlet confluence connector; 41. Outlet connector; 42. Collection hopper; 43. Wind baffle; 44. Water outlet connector; 45. Water inlet connector; 46. Feed connector; 47. Condenser; 48. Exhaust pipe; 49. Outlet connector; 50. Fixed base; 51. Lifting lug; 52. Dry filter; 53. Air inlet pipe; 54. Outlet pipe; 55. Activated carbon adsorption tower; 56. Negative pressure fan; 57. Smoke exhaust pipe; 58. Makeup pipe; 59. Catalytic converter; 60. Injection pipe; 61. Air inlet check valve pipe; 62. Outlet channel connector. Detailed Implementation

[0057] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0058] like Figure 1-3 As shown, the recycling process of this LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system includes the following steps:

[0059] Step 1: Emulsifiers, thickeners, filtration reducers, activity modifiers, synthetic base fluids, and other additives are mixed to form a high-performance synthetic base drilling fluid system;

[0060] Step 2: Inject the high-performance synthetic-based drilling fluid system into the well to carry out drilling operations. The drilling cuttings are then circulated back out of the wellhead to obtain synthetic-based drilling mud.

[0061] Step 3: The negative pressure pump extracts the synthetic base drilling mud under negative pressure and pumps it into the negative pressure vibrating screen for preliminary solid-liquid separation to obtain drill cuttings liquid and drilling mud. The drill cuttings liquid is treated by sedimentation, and the upper layer of liquid re-enters the drilling fluid system for circulation, while the lower layer settles to obtain drilling mud.

[0062] Step four: Drilling mud is preheated by the feeding preheating mechanism and then enters the double-layer thermal desorption mechanism. The double-layer thermal desorption mechanism is heated indirectly by flame, electromagnetic or molten salt to obtain exhaust gas and solid phase.

[0063] Step 5: The solid phase is cooled by the discharge cooling mechanism to obtain clean soil, which is then placed directly on the ground.

[0064] Step 6: The exhaust gas is purified by a dust collector and then recycled by a condenser to obtain synthetic base liquid and gas phase. The synthetic base liquid is collected in a base liquid container and then mixed to form a synthetic base drilling fluid system for resource recycling.

[0065] Step seven: The gas phase is purified by passing through a sedimentation tank, and then adsorbed by a flare or activated carbon to obtain direct exhaust gas, which is directly released into the atmosphere.

[0066] A cooler is connected between the settling tank and the discharge cooling mechanism. Water pipes are provided between the discharge cooling mechanism and the double-layer thermal desorption mechanism, between the double-layer thermal desorption mechanism and the feeding preheating mechanism, between the feeding preheating mechanism and the settling tank, between the cooler and the condenser, and between the condenser and the settling tank.

[0067] Air guide pipes are provided between the feeding preheating mechanism and the dust collector, between the discharging cooling mechanism and the dust collector, between the double-layer thermal desorption mechanism and the dust collector, and between the condenser and the dust collector.

[0068] like Figures 4-12 As shown, the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid recycling system includes a double-layer thermal desorption mechanism 2. The front side of the double-layer thermal desorption mechanism 2 is equipped with a feed preheating mechanism 1 and a discharge cooling mechanism 8. The rear side of the double-layer thermal desorption mechanism 2 is equipped with a dust collector 3. The side of the double-layer thermal desorption mechanism 2 is equipped with a settling tank 6. The front side of the settling tank 6 is equipped with a cooler 7. The rear side of the settling tank 6 is equipped with a condenser 4 and a tail gas adsorption mechanism 5. A water pipe is connected between the cooler 7 and the settling tank 6, the discharge cooling mechanism 8, and the condenser 4. A water pipe is connected between the double-layer thermal desorption mechanism 2 and the feed preheating mechanism 1 and the discharge cooling mechanism 8. A gas pipe is connected between the dust collector 3 and the feed preheating mechanism 1, the double-layer thermal desorption mechanism 2, the discharge cooling mechanism 8, and the condenser 4.

[0069] A negative pressure pump draws out synthetic-based drilling mud under negative pressure and pumps it into a negative pressure vibrating screen for preliminary solid-liquid separation, yielding drill cuttings liquid and drilling mud. The drill cuttings liquid undergoes sedimentation treatment, with the upper layer re-entering the drilling fluid system for circulation, while the lower layer settles to obtain drilling mud. The drilling mud is preheated by the feed preheating mechanism 1 and then enters the double-layer thermal desorption mechanism 2, where it is indirectly heated by flame, electromagnetic, or molten salt to obtain exhaust gas and a solid phase. The solid phase is cooled by the discharge cooling mechanism 8 to obtain clean soil, which is then placed directly on the ground. The exhaust gas is purified by a dust collector 3 and then recovered by a condenser 4 to obtain synthetic-based liquid and a gas phase. The synthetic-based liquid is collected in a liquid container for resource recycling. The process involves the following steps: The gas phase is purified in the settling tank 6, then undergoes activated carbon adsorption and catalytic combustion in the tail gas adsorption mechanism 5 to obtain direct exhaust gas, which is directly released into the atmosphere. The cooler 7 extracts clean water from the settling tank 6 and cools it to obtain cold water. This cold water is injected into the discharge cooling mechanism 8 and the condenser 4 to ensure discharge cooling and gas phase condensation. After heat exchange, the cold water in the discharge cooling mechanism 8 becomes warm water, which then enters the double-layer thermal desorption mechanism 2 to obtain hot water. The hot water enters the feed preheating mechanism 1 to preheat the drilling mud, causing the water temperature to drop before flowing back into the settling tank 6. The tail gas generated by the feed preheating mechanism 1, the double-layer thermal desorption mechanism 2, and the discharge cooling mechanism 8 is collected and sent to the dust collector 3 for dust removal.

[0070] The feeding preheating mechanism 1 and the discharging cooling mechanism 8 have the same structure. The discharging cooling mechanism 8 includes a support 11, with an inclined double-layer conveying cylinder 10 fixed to the upper end of the support 11. A spiral conveying rod is rotatably installed inside the double-layer conveying cylinder 10. A mounting box 14 is fixed to the end of the double-layer conveying cylinder 10, and a conveying motor 15 is fixed inside the mounting box 14. The output shaft of the conveying motor 15 is connected to the end of the spiral conveying rod. The double-layer conveying cylinder 10 is hollow inside. The lower end of the double-layer conveying cylinder 10 is provided with a water inlet pipe 12 and a discharge hopper 13. The upper end of the double-layer conveying cylinder 10 is provided with a feed hopper 9, an air extraction pipe 17 and a water outlet pipe 16 in sequence. The water inlet pipe 12 and the water outlet pipe 16 are both connected to the hollow inner cavity of the double-layer conveying cylinder 10. The feed hopper 9, the air extraction pipe 17 and the discharge hopper 13 are respectively connected to the interior of the double-layer conveying cylinder 10. The water outlet pipe 16 of the feeding preheating mechanism 1 is connected to the sedimentation tank 6. The water inlet pipe 12 of the discharging cooling mechanism 8 is connected to the water outlet of the cooler 7.

[0071] Cold or hot water enters the hollow inner cavity of the double-layer conveying cylinder 10 through the inlet pipe 12. The material enters the interior of the double-layer conveying cylinder 10 through the feed hopper 9, where it is heated or cooled. The output shaft of the conveying motor 15 drives the screw conveyor to rotate, conveying the material. The heated or cooled material is discharged from the outlet hopper 13. The gas generated by the material during the conveying process is extracted by the exhaust pipe 17 for full utilization.

[0072] The double-layer thermal desorption mechanism 2 includes a base 23, with a base frame 21 fixed to the upper end of the base 23. Support frames 19 and 23 are fixed to both ends of the base 23 and base frame 21, respectively. Rotary joints 24 are fixed inside the support frames 19 and 23. Roller frames 29 and heating hollow cylinders 20 are fixed to the upper ends of both the base 23 and base frame 21. The roller frames 29 and support frames 23 are located on the same side. A rotary kiln cylinder 30 is rotatably mounted between the two rotary joints 24 on the same layer. The rotary kiln cylinder 30 abuts against the corresponding roller frames 29. The rotary kiln cylinder 30 is located inside the heating hollow cylinder 20. Electromagnetic heating coils are installed inside the heating hollow cylinder 20. Water guide pipes 22 are installed on the outer wall of the heating hollow cylinder 20. The inlet end of the water guide pipe 22 is connected to the outlet pipe 16 of the discharge cooling mechanism 8, and the outlet end of the water guide pipe 22 is connected to the feed preheating mechanism 1. The water inlet pipe 12 is connected to the support frame 19. The outer side of the support frame 19 is fixed with a material injection box 25. The material injection box 25 is connected to the rotary joint 24 on the same side. The upper end of the upper material injection box 25 is fixed with a feeding hopper 18. The outer side of the support frame 23 is fixed with a discharge box 28. The discharge box 28 is connected to the rotary joint 24 on the same side. A guide pipe 26 is provided between the upper discharge box 28 and the lower material injection box 25. The side of the discharge box 28 is provided with a suction joint 27. The lower discharge box 28 is provided with a discharge hopper 31. The outer side of the rotary joint 24 is fixed with a transmission sprocket 32. The base 23 is fixed with a rotating motor. The output shaft of the rotating motor is connected to the transmission sprocket 32 ​​with a transmission chain. The discharge hopper 13 of the feeding preheating mechanism 1 is located directly above the feeding hopper 18. The feeding hopper 9 of the discharge cooling mechanism 8 is located directly above the discharge hopper 31.

[0073] The output shaft of the rotating motor, via a transmission chain and a transmission sprocket 32, drives two rotary kiln cylinders 30 to rotate between two rotating joints 24 on the same level. Electromagnetic heating coils heat the two rotary kiln cylinders 30. The preheated drilling mud enters the feeding hopper 18, passes through the upper feeding box 25, and through the rotating joints 24 into the upper rotary kiln cylinder 30 for primary heating. It is then injected into the upper discharge box 28, and through the guide pipe 26, through the lower feeding box 25, into the lower rotary kiln cylinder 30 for secondary heating, resulting in dry, powdered clean soil. The material is discharged through the lower discharge box 28 and discharged through the discharge hopper 31. After being cooled by the discharge cooling mechanism 8, it is collected and can be placed directly on the ground. Warm water enters the water guide pipe 22 through the water outlet pipe 16 of the discharge cooling mechanism 8 and the water inlet end of the water guide pipe 22. The electromagnetic heating coil heats the warm water to obtain hot water. The hot water is injected into the water inlet pipe 12 of the feeding preheating mechanism 1 through the water outlet end of the water guide pipe 22 to preheat the drilling mud inside the feeding preheating mechanism 1. During the drying process, the exhaust gas generated is drawn into the dust collector 3 through the exhaust connector 27 for dust removal.

[0074] The dust collector 3 includes a support frame 36, inside which two settling cylinders 37 are fixed. Several circumferentially distributed baffles 43 are provided on the outside of the settling cylinders 37. An air inlet diverter 35 is connected between the two settling cylinders 37. An air inlet connector 34 is connected to the end of the air inlet diverter 35. An air guide pipe is provided between the air inlet connector 34 and the exhaust connector 27 and the exhaust pipe 17, respectively. A collection hopper 42 is provided at the lower end of each of the two settling cylinders 37. An adjusting air duct 38 is provided at the upper end of each of the two settling cylinders 37. An air plate adjusting screw 39 is provided inside the adjusting air duct 38. An air plate is fixed at the lower end of the air plate adjusting screw 39 and is slidably disposed inside the adjusting air duct 38. An air outlet merging connector 40 is provided between the two adjusting air ducts 38. An air outlet connector 41 is fixed at the end of the air outlet merging connector 40.

[0075] The generated exhaust gas is drawn into the air inlet 34 through the exhaust connector 27, and then divided into two settling cylinders 37 in equal amounts through the air inlet splitter 35. It works in conjunction with the baffle 43 to settle and remove dust. The settled dust is collected in the collection hopper 42 and processed periodically. This dust can be discharged directly to the ground. By rotating the wind vane adjusting screw 39, the height of the wind vane is adjusted, which adjusts the air volume. The gas phase after dust removal is collected through the outlet confluence connector 40 and discharged through the outlet connector 41 into the condenser 4 for base liquid condensation.

[0076] The condenser 4 includes two fixed bases 50, on which a condenser cylinder 47 is fixed. The ends of the condenser cylinder 47 are symmetrically provided with an outlet connector 44 and an inlet connector 45. The inlet connector 45 is connected to the outlet end of the cooler 7, and the outlet connector 44 is connected to the sedimentation tank 6. The interior of the condenser cylinder 47 is provided with several guide tubes. A baffle is provided inside the end of the condenser cylinder 47, dividing the interior of the end of the condenser cylinder 47 into a guide chamber. The guide tubes are divided into upper and lower groups, with one end of each group of guide tubes connected to the opposite side. The corresponding flow guiding chambers are connected, and the other end of each set of flow guiding tubes is connected. The interior of the condenser cylinder 47 is provided with several alternately distributed semi-circular baffles, which divide the interior of the condenser cylinder 47 into condensation channels. The upper end of the condenser cylinder 47 is provided with two lifting lugs 51, a feed connector 46, and an exhaust pipe 48. The lower end of the condenser cylinder 47 is provided with a discharge connector 49. The feed connector 46, the exhaust pipe 48, and the discharge connector 49 are all connected to the condensation channels. The feed connector 46 is connected to the air outlet connector 41, and the exhaust pipe 48 is connected to an air pump.

[0077] Cold water enters the guide chamber through the inlet connector 45, then enters several guide tubes for condensation and heat exchange. Warm water enters another guide chamber and is discharged from the outlet connector 44, flowing back into the settling tank 6 for resource recycling. The exhaust gas after dust removal enters the feed connector 46 through the outlet connector 41, enters the condensation channel, and undergoes condensation treatment to obtain synthetic base liquid. The synthetic base liquid is discharged and collected through the discharge connector 49, and then mixed to form a synthetic drilling fluid system for recycling. The air pump draws out the overflow gas phase under negative pressure, extracts it from the exhaust pipe 48, and pumps it into the settling tank 6 for settling treatment.

[0078] The outer wall of the sedimentation tank 6 is provided with several one-way air inlet valve pipes 61. The end of the one-way air inlet valve pipe 61 extends into the interior of the sedimentation tank 6 and is submerged below the water surface. An air outlet connector 62 is fixed on the sedimentation tank 6. An air pump is connected to one of the one-way air inlet valve pipes 61.

[0079] The air pump injects the overflow gas phase into one of the air inlet check valves 61, which then guides it into the sedimentation tank 6 for tail gas filtration and sedimentation. The air inlet check valve 61 ensures that only air can enter and no water can enter. The filtered and sedimented gas is discharged from the air outlet connector 62 into the tail gas adsorption mechanism 5 for final treatment.

[0080] The exhaust gas adsorption mechanism 5 includes a dry filter 52, an exhaust gas frame, and a negative pressure fan 56 arranged sequentially. The dry filter 52 is provided with an air inlet pipe 53, which is connected to an air outlet connector 62. The exhaust gas frame is provided with several equidistantly distributed activated carbon adsorption towers 55. The dry filter 52 and the lower ends of the activated carbon adsorption towers 55 are connected by an air inlet connecting pipe. The upper ends of the activated carbon adsorption towers 55 are provided with an air outlet pipe 54, the end of which is connected to the air inlet of the negative pressure fan 56. The air outlet of the negative pressure fan 56 is provided with a smoke exhaust pipe 57. The side of the exhaust gas frame is provided with a catalytic converter 59, and the side of the catalytic converter 59 is provided with a makeup air fan. An injection pipe 60 is provided between the air outlet of the catalytic converter 59 and the activated carbon adsorption towers 55. A makeup inlet pipe 58 is provided between the air outlet of the catalytic converter 59, the activated carbon adsorption towers 55, and the smoke exhaust pipe 57.

[0081] The negative pressure fan 56 draws in air under negative pressure, and the filtered gas enters the dry filter 52 through the air inlet pipe 53 for further dry filtration. The filtered gas then enters several activated carbon adsorption towers 55 and the exhaust pipe 57 through the air inlet connection pipe. The make-up air fan injects the catalyst from the catalytic box 59 into the activated carbon adsorption towers 55 through the injection pipe 60 for activated carbon adsorption concentration, desorption, and catalytic combustion to obtain clean air. This clean air is then drawn into the negative pressure fan 56 through the exhaust pipe 54 and injected into the exhaust pipe 57 for secondary catalysis, ensuring that the exhaust gas is pollution-free and can be directly discharged to the drilling site.

[0082] Working principle of the invention:

[0083] Emulsifiers, thickeners, filtration reducers, activity modifiers, synthetic base fluids, and other additives are mixed to form a high-performance synthetic base drilling fluid system;

[0084] A high-performance synthetic-based drilling fluid system is injected into the well to carry out drilling operations, and the drilling cuttings are returned to the wellhead through circulation to obtain synthetic-based drilling mud;

[0085] The negative pressure pump extracts synthetic drilling mud under negative pressure and pumps it into a negative pressure vibrating screen for preliminary solid-liquid separation to obtain drill cuttings fluid and drilling mud. The drill cuttings fluid is treated by sedimentation, and the upper layer of liquid re-enters the drilling fluid system for circulation, while the lower layer settles to obtain drilling mud.

[0086] Warm water enters the water inlet of the water pipe 22 through the water outlet 16 of the discharge cooling mechanism 8. The electromagnetic heating coil heats the warm water to obtain hot water. The hot water is injected into the water inlet pipe 12 of the feed preheating mechanism 1 through the water outlet of the water pipe 22 to preheat the drilling mud inside the feed preheating mechanism 1.

[0087] Drilling mud cuttings enter the interior of the double-layer conveying cylinder 10 through the feed hopper 9 of the feed preheating mechanism 1 for heating. The output shaft of the conveying motor 15 drives the screw conveyor to rotate for conveying. The heated drilling mud cuttings are discharged from the discharge hopper 13.

[0088] The output shaft of the rotating motor is connected to the transmission sprocket 32 ​​via a transmission chain, which drives the two rotary kiln cylinders 30 to rotate between the two rotating joints 24 on the same layer. The electromagnetic heating coil heats the two rotary kiln cylinders 30. The preheated drilling mud enters the inside of the feeding hopper 18, passes through the upper feeding box 25, and through the rotating joint 24 into the inside of the upper rotary kiln cylinder 30 for primary heating. It is then injected into the upper discharge box 28, and through the guide pipe 26, through the lower feeding box 25 into the inside of the lower rotary kiln cylinder 30 for secondary heating, resulting in dry powder clean soil. This powder is discharged through the lower discharge box 28 and discharged through the discharge hopper 31.

[0089] The material is fed into the feed hopper 9 of the discharge cooling mechanism 8 and enters the interior of the double-layer conveying cylinder 10 for cooling. The output shaft of the conveying motor 15 drives the screw conveyor to rotate for conveying. The heated drilling mud is discharged from the discharge hopper 13 and collected and placed directly on the ground.

[0090] The generated exhaust gas is drawn into the air inlet 34 through the exhaust connector 27, and then divided into two settling cylinders 37 in equal amounts through the air inlet split connector 35. It works in conjunction with the wind deflector 43 to settle and remove dust. The settled dust is collected in the collection hopper 42 and processed periodically. This dust can be discharged directly to the ground. The height of the air deflector is adjusted by rotating the air deflector adjusting screw 39, which adjusts the air volume. The exhaust gas after dust removal is collected through the outlet confluence connector 40 and discharged through the outlet connector 41. It enters the feed connector 46 and enters the condensation channel for condensation treatment to obtain synthetic base liquid. The synthetic base liquid is discharged and collected through the discharge connector 49 and then mixed to form a synthetic base drilling fluid system for resource recycling. The air pump sucks out the overflow gas phase under negative pressure and extracts it from the exhaust pipe 48 into the settling tank 6 for settling treatment.

[0091] The negative pressure fan 56 draws in air under negative pressure, and the filtered and settled gas enters the dry filter 52 through the air inlet pipe 53 from the air outlet connector 62. It undergoes dry filtration again. The gas after dry filtration enters the interior of several activated carbon adsorption towers 55 and the exhaust pipe 57 through the air inlet connection pipe. The make-up air fan injects the catalyst inside the catalytic box 59 into the interior of several activated carbon adsorption towers 55 through the injection pipe 60. The activated carbon adsorption and concentration, desorption and catalytic combustion are carried out to obtain clean air. The clean air is drawn into the negative pressure fan 56 from the air outlet pipe 54 and injected into the exhaust pipe 57 for secondary catalysis to ensure that the exhaust gas is pollution-free and can be directly discharged to the drilling site.

[0092] The cooler 7 extracts the clean water from the sedimentation tank 6 and cools it to obtain cold water. The cold water enters the hollow inner cavity of the double-layer conveying cylinder 10 through the inlet pipe 12 to cool the material. After heat exchange with the cold water in the discharge cooling mechanism 8, it becomes warm water. The warm water enters the water guide pipe 22 through the inlet end of the water guide pipe 22 via the outlet pipe 16 of the discharge cooling mechanism 8. The electromagnetic heating coil heats the warm water to obtain hot water. The hot water is injected into the inlet pipe 12 of the feeding preheating mechanism 1 through the outlet end of the water guide pipe 22 to preheat the drilling mud inside the feeding preheating mechanism 1.

[0093] The gas generated by the material during the conveying process of the feeding preheating mechanism 1 and the discharging cooling mechanism 8 will be extracted by the air extraction pipe 17 and fully utilized.

[0094] The chiller 7 extracts the clean water from the sedimentation tank 6 and cools it to obtain cold water. The cold water enters the guide chamber from the inlet connector 45 and then enters several guide tubes for condensation and heat exchange. The warm water enters another guide chamber and is discharged from the outlet connector 44, flowing back into the sedimentation tank 6 for resource recycling.

[0095] In summary, a primary solid-liquid separation is achieved through a negative pressure vibrating screen, allowing for direct liquid recycling. The feeding preheating mechanism 1, combined with the double-layer thermal desorption mechanism 2 and the discharge cooling mechanism 8, enables rapid feeding, secondary solid-liquid separation, and rapid discharge of clean soil. The dust collector 3 rapidly filters and settles the exhaust gas generated during the secondary solid-liquid separation, yielding clean exhaust gas. Simultaneously, the dust collector 3, in conjunction with the feeding preheating mechanism 1 and the discharge cooling mechanism 8, collects the gas phase generated by these mechanisms under negative pressure. Finally, the condenser 4, in conjunction with the refrigerator 7, rapidly and stably condenses the filtered exhaust gas to obtain the synthetic base liquid. The gas phase and the synthetic base liquid are collected in the base liquid container for resource recycling. The gas phase is then subjected to secondary filtration and purification in the settling tank 6 to obtain a clean gas phase. A water circulation is formed through the cooler 7, the feed preheating mechanism 1, the double-layer thermal desorption mechanism 2, and the discharge cooling mechanism 8. The discharge cooling mechanism 8 cools the clean soil, and the feed preheating mechanism 1 preheats the drilling mud to ensure the thermal desorption effect and improve the thermal desorption efficiency. The final gas phase is subjected to dry filtration, activated carbon adsorption and concentration, desorption catalytic combustion, and secondary emission catalysis through the tail gas adsorption mechanism 5 to ensure that the tail gas is pollution-free and can be directly discharged to the drilling site.

[0096] A recycling system and process for the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system includes the following raw material components: emulsifier (primary emulsifier, auxiliary emulsifier), viscosity improver, filtration loss reducer, activity regulator, synthetic base fluid, and other additives (alkalinity regulator, etc.).

[0097] Requirements for using this high-performance synthetic-based drilling fluid system: 1. Before drilling begins, the drilling fluid system's mix ratio and performance parameters must be adjusted according to actual drilling conditions such as drilling depth, drilling temperature, and geological conditions (cuttings contamination, salt contamination, etc.) to optimize the drilling performance of the high-performance synthetic-based drilling fluid system. The aging time and temperature of the drilling fluid system must be strictly controlled to ensure it has resistance to high temperatures, contamination, and salt-contamination formation creep. 2. After drilling begins, strengthen formation pressure monitoring and high-pressure oil-water layer prevention. Adjust the drilling fluid density promptly according to the actual downhole conditions and implement spill and leakage prevention measures. 3. During drilling, maintain electrical stability, HTHP filtration loss, base fluid-to-water ratio, and other properties. Control the drilling fluid rheology to reduce ECD and pressure surges, preventing wellbore instability and leakage. Simultaneously, monitor the drilling fluid static shear force to prevent barite settling. If acidic gas intrusion occurs, lime should be added to the drilling fluid as needed to prevent acidic gas pollution and performance monitoring should be strengthened; 4. Closely monitor the return sand from the vibrating screen, accurately predict the downhole conditions based on lithological changes and geological indications, and take targeted measures. When drilling in gypsum mudstone formations, monitor the changes in drilling fluid demulsification voltage and maintain the ES value at a stable value.

[0098] The simulation experimental data of the proportions and performance parameters of this high-performance synthetic-based drilling fluid system are as follows:

[0099] Experiment 1: Formula 1, 1.80 g / cm³ 3 Density, 180℃ aging test table (e.g.) Figure 13 (As shown).

[0100] Experiment 2: Test table of anti-rock debris contamination performance of Formula 1 (e.g.) Figure 14 (As shown).

[0101] Experiment 3: Formula 2, 2.40 g / cm³ 3 Density, 160℃ aging test table (e.g.) Figure 15 (As shown).

[0102] Experiment 4: Test table of anti-rock debris contamination performance of Formula No. 2 (e.g.) Figure 16 (As shown).

[0103] Experiment 5: Test table of cement stain resistance performance of formula No. 2 (e.g.) Figure 17 (As shown).

[0104] Experiment 6: Test table of resistance to salt water contamination of formula No. 2 (e.g.) Figure 18 (As shown).

[0105] Experiment 7: Formula 3, 2.72 g / cm³ 3 Density, 200℃ aging test table (e.g.) Figure 19 (As shown).

[0106] Experiment 8: Formula 1, 1.80 g / cm³ 3 Density, 200℃ aging test table (e.g.) Figure 20 (As shown).

[0107] Experiment 9: Formula 1, 1.80 g / cm³ 3 Density, 220℃ aging test table (e.g.) Figure 21 (As shown).

[0108] Experiment 10: Formula 4, 2.74 g / cm³ 3 Density, 240℃ aging test table (e.g.) Figure 22 (As shown).

[0109] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A recycling process for an LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system, characterized in that, Includes the following steps: Step 1: Emulsifiers, thickeners, filtration reducers, activity modifiers, synthetic base fluids, and other additives are mixed to form a high-performance synthetic base drilling fluid system; Step 2: Inject the high-performance synthetic-based drilling fluid system into the well to carry out drilling operations. The drilling cuttings are then circulated back out of the wellhead to obtain synthetic-based drilling mud. Step 3: The negative pressure pump extracts the synthetic base drilling mud under negative pressure and pumps it into the negative pressure vibrating screen for preliminary solid-liquid separation to obtain drill cuttings liquid and drilling mud. The drill cuttings liquid is treated by sedimentation, and the upper layer of liquid re-enters the drilling fluid system for circulation, while the lower layer settles to obtain drilling mud. Step four: Drilling mud is preheated by the feeding preheating mechanism and then enters the double-layer thermal desorption mechanism. The double-layer thermal desorption mechanism is heated indirectly by flame, electromagnetic or molten salt to obtain exhaust gas and solid phase. Step 5: The solid phase is cooled by the discharge cooling mechanism to obtain clean soil, which is then placed directly on the ground. Step 6: The exhaust gas is purified by a dust collector and then recycled by a condenser to obtain synthetic base liquid and gas phase. The synthetic base liquid is collected in a base liquid container and then mixed to form a synthetic base drilling fluid system for resource recycling. Step 7: The gas phase is purified by a sedimentation tank, and then adsorbed by a flare or activated carbon to obtain direct exhaust gas, which is directly released into the atmosphere. A cooler is connected between the settling tank and the discharge cooling mechanism. Water pipes are provided between the discharge cooling mechanism and the double-layer thermal desorption mechanism, between the double-layer thermal desorption mechanism and the feeding preheating mechanism, between the feeding preheating mechanism and the settling tank, between the cooler and the condenser, and between the condenser and the settling tank. Air guide pipes are provided between the feeding preheating mechanism and the dust collector, between the discharging cooling mechanism and the dust collector, between the double-layer thermal desorption mechanism and the dust collector, and between the condenser and the dust collector.

2. A recycling system for the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process as described in claim 1, characterized in that, The device includes a double-layer thermal desorption mechanism (2), with a feeding preheating mechanism (1) and a discharging cooling mechanism (8) on the front side of the double-layer thermal desorption mechanism (2), a dust collector (3) on the rear side of the double-layer thermal desorption mechanism (2), a settling tank (6) on the side of the double-layer thermal desorption mechanism (2), a cooler (7) on the front side of the settling tank (6), a condenser (4) and a tail gas adsorption mechanism (5) on the rear side of the settling tank (6), a water guide pipe between the cooler (7) and the settling tank (6), the discharging cooling mechanism (8) and the condenser (4), a water guide pipe between the double-layer thermal desorption mechanism (2) and the feeding preheating mechanism (1) and the discharging cooling mechanism (8), and a gas guide pipe between the dust collector (3) and the feeding preheating mechanism (1), the double-layer thermal desorption mechanism (2), the discharging cooling mechanism (8) and the condenser (4).

3. The recycling system of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process according to claim 2, characterized in that, The feeding preheating mechanism (1) and the discharging cooling mechanism (8) are identical. The discharging cooling mechanism (8) includes a support (11). An inclined double-layer conveying cylinder (10) is fixed at the upper end of the support (11). A spiral conveying rod is rotatably installed inside the double-layer conveying cylinder (10). An installation box (14) is fixed at the end of the double-layer conveying cylinder (10). A conveying motor (15) is fixed inside the installation box (14). The output shaft of the conveying motor (15) is connected to the end of the spiral conveying rod. The double-layer conveying cylinder (10) is hollow inside. The lower end of the double-layer conveying cylinder (10) is provided with... There is an inlet pipe (12) and a discharge hopper (13). The upper end of the double-layer conveying cylinder (10) is provided with a feed hopper (9), an air extraction pipe (17) and a water outlet pipe (16). The inlet pipe (12) and the water outlet pipe (16) are connected to the hollow inner cavity of the double-layer conveying cylinder (10). The feed hopper (9), the air extraction pipe (17) and the discharge hopper (13) are respectively connected to the interior of the double-layer conveying cylinder (10). The water outlet pipe (16) of the feeding preheating mechanism (1) is connected to the sedimentation tank (6). The water inlet pipe (12) of the discharge cooling mechanism (8) is connected to the water outlet of the cooler (7).

4. The recycling system of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process according to claim 3, characterized in that, The double-layer thermal desorption mechanism (2) includes a base (23), a base frame (21) fixed to the upper end of the base (23), and support frame one (19) and support frame two (33) fixed to both ends of the base (23) and the base frame (21), respectively. Rotary joints (24) are fixed inside support frame one (19) and support frame two (33). Roller frame (29) and heating hollow cylinder (20) are fixed to the upper ends of the base (23) and the base frame (21), respectively. Roller frame (29) and support frame two (33) are located on the same side. A rotary kiln cylinder (30) is rotatably provided between the two rotating joints (24) of the layer. The rotary kiln cylinder (30) abuts against the roller frame (29) at the corresponding position. The rotary kiln cylinder (30) is located inside the heating hollow cylinder (20). The heating hollow cylinder (20) is equipped with electromagnetic heating coils. The outer wall of the heating hollow cylinder (20) is equipped with water guide pipes (22). The water inlet end of the water guide pipe (22) is connected to the water outlet pipe (16) of the discharge cooling mechanism (8). The water outlet end of the water guide pipe (22) is connected to the feed preheater. The water inlet pipe (12) of the structure (1) is connected, and the outer side of the support frame one (19) is fixed with a material injection box (25). The material injection box (25) is connected with the rotating joint (24) on the same side. The upper end of the upper material injection box (25) is fixed with a feeding hopper (18). The outer side of the support frame two (33) is fixed with a discharge box (28). The discharge box (28) is connected with the rotating joint (24) on the same side. A guide pipe (26) is provided between the upper discharge box (28) and the lower material injection box (25) for material discharge. The sides of the box (28) are equipped with air extraction connectors (27), the lower discharge box (28) is equipped with a discharge hopper (31), the outside of the rotating connector (24) is fixed with a transmission sprocket (32), the base (23) is fixed with a rotating motor, the output shaft of the rotating motor is connected to the transmission sprocket (32) with a transmission chain, the discharge hopper (13) of the feeding preheating mechanism (1) is located directly above the feeding hopper (18), and the feeding hopper (9) of the discharge cooling mechanism (8) is located directly above the discharge hopper (31).

5. The recycling system of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process according to claim 4, characterized in that, The dust collector (3) includes a support frame (36), inside which two settling cylinders (37) are fixed. Several circumferentially distributed baffles (43) are provided on the outside of the settling cylinders (37). An air inlet diverter (35) connects the two settling cylinders (37). An air inlet connector (34) is connected to the end of the air inlet diverter (35). An air inlet connector (34) is connected to an exhaust connector (27) and an exhaust pipe (17) respectively. The lower end of each settling cylinder (37) is provided with a collection hopper (42), and the upper end of each of the two settling cylinders (37) is provided with an adjusting air duct (38). The interior of each adjusting air duct (38) is provided with an air plate adjusting screw (39). The lower end of the air plate adjusting screw (39) is fixed with an air plate, and the air plate is slidably disposed inside the adjusting air duct (38). The two adjusting air ducts (38) are provided with an air outlet merging connector (40), and the end of the air outlet merging connector (40) is fixed with an air outlet connector (41).

6. The recycling system of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process according to claim 5, characterized in that, The condenser (4) includes two fixed seats (50), on which a condenser cylinder (47) is fixed. The ends of the condenser cylinder (47) are symmetrically provided with an outlet connector (44) and an inlet connector (45). The inlet connector (45) is connected to the outlet end of the cooler (7), and the outlet connector (44) is connected to the sedimentation tank (6). The interior of the condenser cylinder (47) is provided with several guide tubes. The end of the condenser cylinder (47) is provided with a partition, which divides the interior of the end of the condenser cylinder (47) into a guide chamber. The guide tubes are divided into upper and lower groups, with one end of each group of guide tubes connected to… The corresponding flow guide chambers are connected, and the other end of each set of flow guide tubes is connected. The interior of the condenser (47) is provided with several alternating semi-circular baffles. The semi-circular baffles divide the interior of the condenser (47) into condensation channels. The upper end of the condenser (47) is provided with two lifting lugs (51), a feed connector (46), and an exhaust pipe (48). The lower end of the condenser (47) is provided with a discharge connector (49). The feed connector (46), the exhaust pipe (48), and the discharge connector (49) are all connected to the condensation channels. The feed connector (46) is connected to the air outlet connector (41). The exhaust pipe (48) is connected to an air pump.

7. The recycling system of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process according to claim 6, characterized in that, The outer wall of the sedimentation tank (6) is provided with several one-way valve pipes (61). The end of the one-way valve pipe (61) extends into the sedimentation tank (6) and is submerged below the water surface. An air outlet connector (62) is fixed on the sedimentation tank (6). An air pump is connected to one of the one-way valve pipes (61).

8. The recycling system of the LH-SBM environmentally friendly high-performance synthetic-based drilling fluid system recycling process according to claim 7, characterized in that, The exhaust gas adsorption mechanism (5) includes a dry filter (52), an exhaust gas frame, and a negative pressure fan (56) arranged sequentially. The dry filter (52) is provided with an inlet pipe (53), which is connected to an outlet channel connector (62). The exhaust gas frame is provided with several equally spaced activated carbon adsorption towers (55). The dry filter (52) and the lower ends of the several activated carbon adsorption towers (55) are connected by an inlet connecting pipe. The upper ends of the several activated carbon adsorption towers (55) are provided with an outlet pipe. 54), the end of the exhaust pipe (54) is connected to the air inlet of the negative pressure fan (56), the air outlet of the negative pressure fan (56) is provided with a smoke exhaust pipe (57), the side of the exhaust frame is provided with a catalytic box (59), the side of the catalytic box (59) is provided with a makeup air fan, the air outlet of the catalytic box (59) is provided with an injection pipe (60) between the air outlet of the catalytic box (59) and several activated carbon adsorption towers (55), and the air outlet of the catalytic box (59) is provided with a makeup pipe (58) between the air outlet of the catalytic box (59) and several activated carbon adsorption towers (55) and the smoke exhaust pipe (57).

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