Roller type drilling rock dust rapid drying device

Abstract

The application discloses a drum-type drilling rock debris rapid drying device, which comprises a rock debris drying device, a hot air circulating device and a feeding device connected with one end of the rock debris drying device respectively, and a gas collection and purification device connected with the other end of the rock debris drying device. The device can rapidly separate and dehydrate and dry the rock debris discharged from the vibrating screen, can rapidly reduce the liquid content of the drilling rock debris, and can change the rock debris from viscous liquid to dry granular or powdery state. The device provides high-temperature hot air through a heater to dry the rock debris, reduces the moisture in the rock debris, ensures that the rock debris can meet the long-distance transportation requirement, and reduces the difficulty of rock debris treatment and storage. The gas collection and purification device of the device can recycle the separated water and oil in the rock debris to a drilling mud system, and realizes drilling mud saving.

Description

Technical Field

[0001] This invention belongs to the field of drilling equipment technology and relates to a drum-type rapid drying device for drilling cuttings. Background Technology

[0002] During oil drilling operations, a large amount of drilling cuttings are generated. These cuttings are returned to the surface with the drilling fluid, filtered and separated by a vibrating screen, and then discharged as waste. The discharged cuttings typically contain large amounts of rock particles, mineral oil, and low-density colloidal substances, making them hazardous waste harmful to the environment. They are mostly in the form of viscous liquids such as pastes or slurries, possessing a certain degree of fluidity, making them inconvenient to store and transport.

[0003] Currently, at drilling sites, drilling teams typically use screw conveyors to collect and transport drilling cuttings discharged from vibrating screens to cuttings collection boxes. After simple drying or solidification, the cuttings are loaded into specialized vehicles and transported to the oilfield waste disposal area. However, this method cannot quickly separate the solids and liquids and dehydrate and dry the cuttings discharged from the vibrating screen, thus failing to rapidly reduce the liquid content of the drilling cuttings. This prevents the cuttings from changing from a viscous liquid to a dry granular or powdery state. The cuttings discharged from the vibrating screen still contain a high level of oil or water, which can easily lead to spillage during transportation, failing to meet environmental protection requirements and causing pollution and delays in transportation. Furthermore, the high liquid content of the cuttings results in significant mud loss, hindering on-site cuttings treatment and mud reuse.

[0004] Therefore, how to quickly separate the rock cuttings discharged from the vibrating screen into solid and liquid and dehydrate and dry them, rapidly reduce the liquid content of the drilling rock cuttings, and change the rock cuttings from a viscous liquid state into dry granular or powdery state, so as to ensure that the rock cuttings can meet the requirements of environmentally friendly transportation and reduce the difficulty of rock cuttings processing and storage, is an urgent problem. Summary of the Invention

[0005] The purpose of this invention is to provide a drum-type rapid drying device for drilling cuttings, which solves the problem in the prior art that it is impossible to quickly separate and dehydrate the cuttings discharged from the vibrating screen.

[0006] The technical solution adopted in this invention is a drum-type drilling cuttings rapid drying device, including a cuttings drying device. One end of the cuttings drying device is connected to a hot air circulation device and a feeding device, and the other end of the cuttings drying device is connected to a gas collection and purification device.

[0007] The invention is further characterized by:

[0008] The rock cuttings drying device includes a drying drum, which is inclinedly arranged on a first support base. The height of the feeding end of the drying drum is higher than the height of the discharging end of the drying drum. A first rotary joint is installed at the feeding end of the drying drum, and a second rotary joint is installed at the discharging end of the drying drum. An exhaust port is provided at the top of the second rotary joint, and a discharge port is provided at the bottom of the second rotary joint. A rock cuttings collection box is provided below the discharge port. The first rotary joint is connected to a hot air circulation device and a feeding device through pipelines, and the exhaust port of the second rotary joint is connected to a gas collection and purification device through pipelines.

[0009] The drying drum is fixed to the first support base via roller frames. There are at least two roller frames. One end of the roller frame is fixed to the first support base, and the other end of the roller frame is sleeved on the outer wall of the drying drum.

[0010] A large gear ring is also provided on the outer wall of the drying drum. The drying drum is connected to the electric device through the large gear ring. The electric device includes a motor. The output end of the motor is fixedly connected to a pinion. The pinion meshes with the large gear ring. The motor is fixed on the first support base.

[0011] Several mud baffles are provided on the inner side wall of the drying drum. The mud baffles are arranged in a spiral shape. A central rotating shaft is provided at the axis position inside the drying drum. Several stirring rakes are fixed on the side wall of the central rotating shaft. One end of the central rotating shaft is mounted on the first rotary joint through a bearing. The other end of the central rotating shaft passes through the first rotary joint and is connected to the rotating shaft drive device. The rotating shaft drive device is fixed on the first support base.

[0012] The feeding device includes a feeding hopper, and a screw conveyor is installed at the bottom of the feeding hopper. The screw conveyor is connected to the drying drum through a first rotary joint. Both the screw conveyor and the feeding hopper are fixed on the first support base.

[0013] The hot air circulation device includes a heater. The heater inlet is connected to a fan and a gas collection and purification device via pipelines. The heater inlet is also equipped with a filter. The heater outlet is connected to the inlet of the hot air inlet device. The outlet of the hot air inlet device is connected to the first rotary joint. The fan and the heater are both fixed on the first support.

[0014] The gas collection and purification device is installed on the second support base. The gas collection and purification device includes a condensing cyclone. A first dust collection box is provided at the bottom of the condensing cyclone. The air inlet of the condensing cyclone is connected to a second rotary joint. The condensing cyclone is provided with a first air outlet and a second air outlet. The first air outlet is connected to the air inlet of the heater. The second air outlet is connected to the gas dust removal device through a pipeline. A first vacuum pump is also provided between the condensing cyclone and the gas dust removal device.

[0015] The gas dust removal device includes a bag filter, the air inlet of which is connected to a condenser cyclone separator, the air outlet of which is connected to the air inlet of an activated carbon adsorption device, a second dust collection box at the bottom of the bag filter, and the air outlet of the activated carbon adsorption device connected to an exhaust pipe via a second vacuum pump.

[0016] The beneficial effects of this invention are:

[0017] This invention relates to a drum-type rapid drilling cuttings drying device. Through a hot air circulation system and a gas collection and purification system, it can rapidly separate solids and liquids and dehydrate and dry the drilling cuttings discharged from a vibrating screen. This quickly reduces the liquid content of the drilling cuttings, transforming them from a viscous liquid into dry granules or powder. The device uses a heater to provide high-temperature hot air for drying the cuttings, reducing moisture content and ensuring they meet the requirements for long-distance transportation. It also reduces the difficulty of processing and storing the cuttings. The gas collection and purification system allows the water and oil separated from the cuttings to be reused in the drilling mud system, achieving drilling mud savings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the drum-type rapid drying device for drilling cuttings of the present invention;

[0019] Figure 2 yes Figure 1 Sectional view of AA;

[0020] Figure 3 This is a top view of the drum-type rapid drying device for drilling cuttings of the present invention;

[0021] Figure 4 This is a flowchart illustrating the working process of the drum-type rapid drying device for drilling cuttings of the present invention.

[0022] In the diagram, 1. Feed hopper, 2. Screw conveyor, 3. Drying drum, 4. First rotary joint, 5. Second rotary joint, 6. First support base, 7. Roller frame, 8. Rock cuttings collection box, 9. Large gear ring, 10. Small gear, 11. Motor, 12. Central rotating shaft, 13. Stirring rake, 14. Mud baffle, 15. Rotary shaft drive device, 16. Heater, 17. Fan, 18. Hot air inlet device, 19. Second support base, 20. Condensing cyclone, 21. First dust collection box, 22. First air outlet, 23. Second air outlet, 24. First vacuum pump, 25. Bag filter, 26. Activated carbon adsorption device, 27. Second dust collection box, 28. Second vacuum pump, 29. Exhaust pipe, 30. Filter, 31. Vibrating screen, 32. Cooling device, 33. Discharge equipment, 34. Transport vehicle, 35. Preheated gas. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] This invention relates to a drum-type rapid drying device for drilling cuttings, such as... Figure 1 and Figure 2 As shown, the device includes a rock cuttings drying unit. One end of the rock cuttings drying unit is connected to a hot air circulation device and a feeding device, while the other end is connected to a gas collection and purification device. The hot air circulation device can provide high-temperature hot air that enters the drum in the same direction as the rock cuttings with a high liquid content conveyed by the feeding device, which helps the high-temperature hot air to fully dry the moist rock cuttings. The gas collection and purification device can condense, separate, remove dust, and adsorb and purify the gas generated during the drying process, and can recover the moisture and oil from the rock cuttings, so that the treated gas meets the environmental emission requirements.

[0025] The rock cuttings drying device includes a drying drum 3, which is inclinedly arranged on a first support 6. The height of the feed end of the drying drum 3 is higher than the height of the discharge end of the drying drum 3, so that rock cuttings with a high liquid content enter the drying drum 3 from the higher end and exit from the lower end. A first rotary joint 4 is installed at the feed end of the drying drum 3, and a second rotary joint 5 is installed at the discharge end of the drying drum 3. The second rotary joint 5 has an exhaust port at the top and an outlet at the bottom. A rock cuttings collection box 8 is located below the outlet. The first rotary joint 4 is connected to a hot air circulation device and a feeding device through pipelines, and the exhaust port of the second rotary joint 5 is connected to a gas collection and purification device through pipelines.

[0026] The drying drum 3 is fixed to the first support base 6 via roller frame 7. There are at least two roller frames 7. One end of the roller frame 7 is fixed to the first support base 6, and the other end of the roller frame 7 is sleeved on the outer wall of the drying drum 3. The roller frame 7 provides support for the drying drum 3. At the same time, by adjusting the height of the roller frame 7, the drying drum 3 can be tilted on the first support base 6.

[0027] A large gear ring 9 is also provided on the outer wall of the drying drum 3. The drying drum 3 is connected to the electric device through the large gear ring 9. The electric device includes a motor 11. The output end of the motor 11 is fixedly connected to the pinion 10. The pinion 10 meshes with the large gear ring 9. The motor 11 is fixed on the first support seat 6. Through the interaction between the pinion 10 and the large gear ring 9, the motor 11 provides power to drive the drying drum 3 to rotate, thereby causing the rock chips inside the drying drum 3 to tumble, which is conducive to the separation and evaporation of moisture, oil and other substances in the rock chips.

[0028] Several mud baffles 14 are provided on the inner wall of the drying drum 3, such as Figure 3As shown, the mud baffles 14 are arranged in a spiral shape, and the spiral direction is consistent with the rotation direction of the drying drum 3. When the drying drum 3 rotates, the mud baffles 14 on the inner wall of the drying drum 3 can, on the one hand, stir and turn the slurry-like rock chips, carrying the rock chips along the drum wall to a certain height before they fall; on the other hand, they can gradually push the rock chips from one end of the drying drum 3 to the other end. A central rotating shaft 12 is provided at the axial position inside the drying drum 3. Several stirring rakes 13 are fixed to the side wall of the central rotating shaft 12. One end of the central rotating shaft 12 is mounted on the first rotary joint 4 through a bearing, and the other end of the central rotating shaft 12 passes through the first rotary joint 4 and is connected to the rotating shaft drive device 15. The rotating shaft drive device 15 is fixed on the first support seat 6. When the drying drum 3 rotates, the central rotating shaft 12 drives the stirring rakes 13 to rotate. The rotation direction of the central rotating shaft 12 is opposite to the rotation direction of the drum. The stirring rakes 13 can further break up the falling rock chips, which helps to fully contact the moist rock chips with the hot air.

[0029] The feeding device includes a feeding hopper 1, and a screw conveyor 2 is provided at the bottom of the feeding hopper 1. The screw conveyor 2 is connected to the drying drum 3 through the first rotary joint 4. Both the screw conveyor 2 and the feeding hopper 1 are fixed on the first support base 6.

[0030] The hot air circulation device includes a heater 16. The air inlet of the heater 16 is connected to the fan 17 and the gas collection and purification device via pipelines. The air inlet of the heater 16 is also equipped with a filter 30. The air outlet of the heater 16 is connected to the air inlet of the hot air inlet device 18. The air outlet of the hot air inlet device 18 is connected to the first rotary joint 4. The fan 17 and the heater 16 are both fixed on the first support 6. The heater 16 provides high-temperature hot air that enters the interior of the drying drum 3 from the feed end. The high-temperature hot air enters the drum in the same direction as the rock chips with high liquid content, which helps to fully dry the moist rock chips. Through the drying effect of the high-temperature hot air, the moisture in the rock chips is reduced, ensuring that the rock chips can meet the requirements for long-distance transportation and reducing the difficulty of rock chip processing and storage.

[0031] The gas collection and purification device is installed on the second support base 19. The gas collection and purification device includes a condensing cyclone 20. A first dust collection box 21 is provided at the bottom of the condensing cyclone 20. The air inlet of the condensing cyclone 20 is connected to the second rotary joint 5. The condensing cyclone 20 is provided with a first air outlet 22 and a second air outlet 23. The first air outlet 22 is connected to the air inlet of the heater 16. The second air outlet 23 is connected to the gas dust removal device through a pipeline. A first vacuum pump 24 is also provided between the condensing cyclone 20 and the gas dust removal device. The first vacuum pump 24 provides gas flow within the condensing cyclone 20. Powered by the drying drum 3, it can be extracted for subsequent condensation, separation, dust removal, adsorption and purification. Therefore, it can also be set in the air inlet of the condenser cyclone 20 or in the subsequent pipeline. The specific design can be made according to actual needs. The first air outlet 22 is connected to the air inlet of the heater 16. The high-temperature exhaust gas extracted from the drying drum 3 can be condensed and separated. The high-temperature non-condensable gas generated can be returned to the air inlet and re-entered into the drying drum 3 after appropriate heating for drying operation, realizing the reuse of exhaust gas heat energy, saving overall energy consumption, and saving drilling mud.

[0032] The gas dust removal device includes a bag filter 25, the air inlet of which is connected to a condenser cyclone 20, the air outlet of which is connected to the air inlet of an activated carbon adsorption device 26, a second dust collection box 27 at the bottom of the bag filter 25, and the air outlet of the activated carbon adsorption device 26 is connected to an exhaust pipe 29 via a second vacuum pump 28.

[0033] The working process of the drum-type rapid drilling cuttings drying device of the present invention is as follows:

[0034] The working process of a drum-type rapid drilling cuttings drying device, such as... Figure 4As shown, the drilling cuttings produced by the vibrating screen 31 are conveyed to the drying drum 3 via the feed hopper 1 and screw conveyor 2. The device is then activated, and the fan 17 draws preheated gas 35 into the heater 16 through the air inlet. The preheated gas is dry nitrogen or air. The preheated gas 35 is heated to a specified temperature and then sent to the drying drum 3 via the hot air inlet device 18. The drying drum 3 is arranged at an angle and rotates as a whole under the action of the large gear ring 9, the small gear 10, and the motor 11. The mud baffle 14 inside the drying drum 3 carries the wet drilling cuttings and tumbles them along the drum, causing them to rise from the bottom to the top and then fall to form a material curtain. The central rotating shaft 12 and the stirring rake 13 inside the drying drum 3 rotate under the action of the rotating shaft drive device 15. The drilling cuttings are broken up and stirred by the stirring rake 13 on the central rotating shaft 12, allowing the drilling cuttings to fully mix and contact with the dry hot air. Under the heating effect of the hot air, the moisture, oil, and other substances in the drilling cuttings are separated and evaporated. Simultaneously, the rotation of the mud baffle 14 and the stirring rake 13 on the inner wall of the drying drum 3 creates a spiral propulsion effect, continuously pushing the rock chips and hot air to the discharge end of the drum. During this process, the rock chips are gradually dried, and the dried rock chip residue is discharged from the discharge port at the bottom of the second rotary joint 5. The gas generated during drying is discharged from the exhaust port at the top of the discharge end.

[0035] The first vacuum pump 24 in the gas collection and purification device draws the gas generated by evaporation out of the drying drum 3 and sends it to the condensing cyclone separator 20. Through swirling, sedimentation, and condensation, the moisture, impurities, and oil in the gas are separated. The gas produced in this process is then sent to the bag filter 25 and the activated carbon adsorption device 26 for further separation of oil, water, and impurities. The final gas produced can be discharged into the atmosphere. At the same time, the non-condensable gas produced by the condensing cyclone separator 20, after being filtered for impurities, can be reintroduced into the inlet of the heater 16 to participate in the heating of cold air or nitrogen, thereby realizing the reuse of the exhaust gas heat energy.

[0036] Finally, the rock debris collected by the rock debris collection box 8, the first dust collection box 21, and the second dust collection box 27 is fed into the discharge device 33 and transported by the transport vehicle 34. If the temperature of the rock debris is too high, it can also be cooled by the cooling device 32 before being fed into the discharge device 33.

Claims

1. A drum-type rapid drying device for drilling cuttings, characterized in that, The device includes a rock cuttings drying device, one end of which is connected to a hot air circulation device and a feeding device, and the other end of which is connected to a gas collection and purification device. The rock cuttings drying device includes a drying drum (3), which is inclinedly arranged on a first support base (6). The height of the feeding end of the drying drum (3) is higher than the height of the discharging end of the drying drum (3). A first rotary joint (4) is installed at the feeding end of the drying drum (3), and a second rotary joint (5) is installed at the discharging end of the drying drum (3). The top of the second rotary joint (5) is provided with an exhaust port, and the bottom of the second rotary joint (5) is provided with a discharge port. A rock cuttings collection box (8) is provided below the discharge port. The first rotary joint (4) is connected to a hot air circulation device and a feeding device through pipelines, and the exhaust port of the second rotary joint (5) is connected to a gas collection and purification device through pipelines. The gas collection and purification device is installed on the second support base (19). The gas collection and purification device includes a condenser cyclone (20). The bottom of the condenser cyclone (20) is provided with a first dust collection box (21). The air inlet of the condenser cyclone (20) is connected to the second rotary joint (5). The condenser cyclone (20) is provided with a first air outlet (22) and a second air outlet (23). The first air outlet (22) is connected to the air inlet of the heater (16). The second air outlet (23) is connected to the gas dust removal device through a pipeline. A first vacuum pump (24) is also provided between the condenser cyclone (20) and the gas dust removal device. The drying drum (3) has several mud baffles (14) arranged in a spiral shape on its inner side wall. The drying drum (3) has a central rotating shaft (12) located at its inner axis. Several stirring rakes (13) are fixed to the side wall of the central rotating shaft (12). One end of the central rotating shaft (12) is mounted on the first rotating joint (4) through a bearing. The other end of the central rotating shaft (12) passes through the first rotating joint (4) and is connected to the rotating shaft drive device (15). The rotating shaft drive device (15) is fixed on the first support base (6). The gas dust removal device includes a bag filter (25), the air inlet of the bag filter (25) is connected to a condenser cyclone (20), the air outlet of the bag filter (25) is connected to the air inlet of an activated carbon adsorption device (26), a second dust collection box (27) is provided at the bottom of the bag filter (25), and the air outlet of the activated carbon adsorption device (26) is connected to an exhaust pipe (29) through a second vacuum pump (28). The hot air circulation device includes a heater (16), the air inlet of the heater (16) is connected to a fan (17) and a gas collection and purification device through pipelines, the air inlet of the heater (16) is also provided with a filter (30), the air outlet of the heater (16) is connected to the air inlet of the hot air inlet device (18), the air outlet of the hot air inlet device (18) is connected to the first rotary joint (4), and the fan (17) and the heater (16) are both fixed on the first support base (6).

2. The drum-type rapid drilling cuttings drying device according to claim 1, characterized in that, The drying drum (3) is fixed to the first support base (6) via a roller frame (7). There are at least two roller frames (7). One end of the roller frame (7) is fixed on the first support base (6), and the other end of the roller frame (7) is sleeved on the outer wall of the drying drum (3).

3. The drum-type rapid drilling cuttings drying device according to claim 2, characterized in that, A large gear ring (9) is also provided on the outer wall of the drying drum (3). The drying drum (3) is connected to the electric device through the large gear ring (9). The electric device includes a motor (11). The output end of the motor (11) is fixedly connected to the pinion (10). The pinion (10) meshes with the large gear ring (9). The motor (11) is fixed on the first support seat (6).

4. The drum-type rapid drilling cuttings drying device according to claim 3, characterized in that, The feeding device includes a feeding hopper (1), and a screw conveyor (2) is provided at the bottom of the feeding hopper (1). The screw conveyor (2) is connected to the drying drum (3) through a first rotary joint (4). The screw conveyor (2) and the feeding hopper (1) are both fixed on the first support base (6).

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