A supercritical extraction treatment device and method for drilling waste flowback liquid

Abstract

The invention discloses a device and method for supercritical extraction treatment of drilling return waste liquid. The device comprises a shell, a CO2 pressurizing component, a mixing component and a separation component. The CO2 pressurizing component comprises a fixing frame arranged outside the shell, a pressurizing motor arranged on the fixing frame and having a driving gear on the output shaft, and a piston cylinder sleeved on the shell, the piston cylinder is provided with a lead screw engaged with the fixing frame, and the lead screw is provided with a pinion connected with the driving gear; the mixing component comprises a mixing motor arranged at the bottom of the shell, a mounting plate arranged on the output shaft of the mixing motor and located at the bottom of the shell, and a mixing plate arranged on the mounting plate; the separation component comprises a liquid inlet plate arranged at the top of the shell, a gas collecting plate and a separation tube arranged on the liquid inlet plate, the separation tube is provided with an outlet pipe communicated with the gas collecting plate, and an electric heating sleeve is provided outside the separation tube; the device of the invention has reasonable structural design, high treatment efficiency of drilling return waste liquid, and is suitable for popularization and use.

Description

Technical Field

[0001] The invention relates to the technical field of drilling flowback fluid treatment, and in particular to a supercritical extraction treatment device and method for drilling flowback waste fluid. Background Art

[0002] With the continuous development of oil fields, the water content of oil layers increases, the pressure decreases, and the difficulty of mining increases. In order to ensure the production capacity of oil wells, repeated transformation measures of old oil field reservoirs such as well washing, well repair, acidification, and fracturing are often taken. During the operation, the wellbore return fluid contains a large amount of fine sand particles, suspended matter, impurities, colloidal residues, dissolved organic matter, etc.; the acidification operation of oil wells and water injection wells is a conventional production and injection increase measure for the development of old oil fields. It is mainly through injecting acid into oil wells and water injection wells to dissolve the blockage of the bottom and near-well oil layers, and restore the original permeability of the oil and gas layers, so as to achieve the purpose of production increase and injection increase. In recent years, the scale of low-permeability oil reservoir development in my country has gradually expanded, and the workload of acidification operations has also increased significantly.

[0003] Since the acid well discharge fluid has complex internal pollutant components, it is very easy to cause corrosion damage to downstream equipment and is very harmful to the environment. Therefore, the acid well discharge fluid must be purified until it meets the standards before it can be discharged. However, the technology for treating the acid well return fluid still has the defects of complicated treatment process, high treatment cost and poor treatment effect. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides a supercritical extraction treatment device and method for drilling return waste liquid.

[0005] The technical scheme of the present invention is: a supercritical extraction treatment device for waste flowback liquid from drilling, comprising a shell, a CO2 pressurizing component, a mixing component and a separation component; a base is arranged at the lower end of the shell, and a separation chamber and a mixing chamber are arranged in sequence from top to bottom inside the shell; a first collecting tube and a second collecting tube communicating with the separation chamber are arranged on the shell, and a liquid adding tube and a discharge tube communicating with the mixing chamber are arranged on the shell; the separation chamber and the mixing chamber are connected by a liquid guiding tube, and a pressure pump is arranged at the connection; an infrared heating plate is arranged on the top of the shell;

[0006] The CO2 pressurizing assembly includes a fixing frame, a pressurizing motor and a piston cylinder; the fixing frame is arranged on the base and is located outside the shell, the pressurizing motor is arranged on the fixing frame, the output shaft of the pressurizing motor passes through the fixing frame and is provided with a driving gear; the piston cylinder is sleeved on the top of the outer surface of the shell, the piston cylinder is provided with an intake pipe and a telescopic tube connected to the mixing chamber, and the telescopic tube is provided with an electric control valve; the piston cylinder is circumferentially threadedly connected with a lead screw which is rotatably connected with the fixing frame and the base respectively, and the lead screw is sleeved with a pinion which is meshed with the driving gear;

[0007] The mixing assembly includes a mixing motor, a mounting disc and a mixing plate; the mixing motor is arranged at the bottom of the housing, the output shaft of the mixing motor penetrates the housing and is rotatably connected with the top of the mixing chamber, two mounting discs are arranged, and the two mounting discs are respectively sleeved on the output shaft; a plurality of mixing plates are arranged, and they are respectively movably connected between the two mounting discs, and each mixing plate is provided with a liquid homogenizing pipe;

[0008] The separation component includes a liquid inlet plate, an air collecting plate and a separation tube. The liquid inlet plate and the air collecting plate are respectively arranged at the bottom and top of the separation chamber. The liquid inlet plate is connected to the liquid guide tube, and the air collecting plate is connected to the first collecting tube. There are several separation tubes, each of which is arranged on the liquid inlet plate, and each separation tube is provided with an air outlet pipe connected to the air collecting plate, and each separation tube is provided with an electric heating sleeve on the outside.

[0009] Furthermore, it also includes a PLC controller, which is electrically connected to the pressure pump, the infrared heating plate, the pressurizing motor, the electric control valve, the mixing motor and the electric heating sleeve respectively;

[0010] Description: By setting up a PLC controller, it is beneficial to improve the degree of automation of the device of the present invention, thereby improving the processing efficiency of drilling return waste fluid.

[0011] Furthermore, a pressure sensor and a temperature sensor are provided inside the piston cylinder and are electrically connected to the PLC controller respectively;

[0012] Note: By arranging a pressure sensor and a temperature sensor inside the piston cylinder, it is helpful to improve the accuracy of controlling the pressure and temperature parameters during the preparation of supercritical CO2.

[0013] Furthermore, a hollow disk sleeved on the output shaft of the mixing motor is provided at the bottom of the mixing chamber, a rotating disk connected to the output shaft of the mixing motor is rotatably clamped inside the hollow disk, and a plurality of nozzles are provided at the upper end of the rotating disk; the hollow disk is connected to the telescopic tube;

[0014] Description: When the pressurized motor rotates, it drives the rotating disk to rotate along the hollow disk, so that the supercritical CO2 is sprayed into the drilling return waste fluid through the nozzle, which is beneficial to improve the mixing effect of the supercritical CO2 and the drilling return waste fluid.

[0015] Furthermore, one side of each mixing plate close to the output shaft is rotatably engaged with the two mounting plates through a rotating shaft, and one side of each mixing plate away from the output shaft is provided with a sliding protrusion, and both mounting plates are provided with an arc groove slidably engaged with the sliding protrusion, and a return spring is provided inside the arc groove; one end of each mixing plate close to the inner wall of the shell is provided with a collision ball, and a wedge-shaped slider is provided on the inner wall of the shell at a position corresponding to the position of each mixing plate;

[0016] Description: When the mounting plate rotates with the output shaft, the collision ball on the mixing plate collides with the wedge-shaped slider and then slides a certain distance along the arc groove. At this time, the drilling return waste liquid changes its flow direction after passing through the liquid mixing pipe, thereby improving the mixing efficiency of supercritical CO2 and drilling return waste liquid.

[0017] Furthermore, the rotating shaft is rotatably connected to the mixing plate, the rotating shaft is fixedly connected to the mounting plate, and a first gear sleeve is sleeved on the rotating shaft; a plurality of liquid homogenizing tubes are provided, and each liquid homogenizing tube in the vertical direction is connected by a connecting rod, and each connecting rod is sleeved with a second gear sleeve, and a gear plate meshing with the first gear sleeve and the second gear sleeve is slidably connected inside the mixing plate;

[0018] Description: When the mixing plate rotates on the rotating shaft, the tooth plate moves along the mixing plate under the action of the first tooth sleeve, and the connecting rod rotates a certain angle under the action of the second tooth sleeve, thereby changing the direction of the liquid homogenization pipe and improving the extraction efficiency of the pickling material in the drilling return waste fluid.

[0019] Furthermore, an explosion-proof net is provided on the outside of the piston cylinder;

[0020] Note: Setting up an explosion-proof net can help improve the safety of the piston cylinder during pressurization.

[0021] Furthermore, a protective shell located outside the driving gear is provided on the fixing frame;

[0022] Note: Providing a protective shell can help improve the stability and reliability of the driving gear during rotation.

[0023] Furthermore, a condensation recovery tank connected to the first collecting pipe is provided on the base:

[0024] Description: The condensation recovery tank condenses and recovers the gasified CO2 gas, which can realize the recycling of CO2 gas and thus reduce the treatment cost of drilling return waste fluid.

[0025] Furthermore, the top ends of the separation tubes are connected through a main coil, and the main coil is connected to the second collecting tube;

[0026] Note: By setting up the main coil, it is convenient to collect the pollutants discharged from the CO2 gas.

[0027] The present invention also provides a method for supercritical extraction treatment of drilling return waste fluid, comprising the following steps:

[0028] S1. Connect the pressure pump, infrared heating plate, pressure motor, electric control valve, mixing motor and electric heating jacket to an external power source respectively;

[0029] S2, the drilling return waste liquid is introduced into the mixing chamber through the liquid adding pipe, and then the external CO2 gas is introduced into the piston cylinder through the air inlet pipe; the infrared heating plate is turned on to heat the CO2 gas; at the same time, the pressure motor is turned on to drive the driving gear to rotate, and the pinion and the lead screw are driven to rotate. At this time, the piston cylinder moves along the outer wall of the shell under the action of the lead screw, and finally the CO2 gas is converted into a supercritical fluid state;

[0030] S3, open the electric control valve and the mixing motor, so that the supercritical CO2 enters the mixing chamber through the telescopic tube and mixes with the drilling return waste liquid; the mixing motor drives the output shaft to rotate, so that each mixing plate rotates continuously under the action of the mounting plate, and the supercritical CO2 and the drilling return waste liquid are fully stirred and mixed;

[0031] S4. After the supercritical CO2 and the drilling return waste liquid are mixed, the pressure pump and the electric heating sleeve are turned on. The supercritical CO2 carries the pollutants in the drilling return waste liquid into the liquid inlet plate through the liquid guide tube, and continuously rises through each separation tube. The electric heating sleeve is used to heat each separation tube, so that the supercritical CO2 is gasified and enters the gas collecting plate through the gas outlet pipe, and is finally discharged from the shell through the first collecting pipe for collection; the pollutants separated from the supercritical CO2 eventually flow into the separation chamber through the ends of each separation tube, and are finally discharged from the shell through the second collecting pipe for collection; the treated drilling return waste liquid is discharged from the shell through the discharge pipe.

[0032] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0033] First, the present invention has a reasonable structural design, which greatly simplifies the processing procedure of the acidized well drilling flowback fluid, thereby reducing the processing cost of the drilling flowback fluid and realizing the harmless treatment and resource utilization of the acidized well drilling flowback fluid;

[0034] Second, the integrated device of the present invention improves the flexibility in the treatment of drilling return waste fluid, thereby reducing the equipment pressure caused by the centralized treatment of drilling return waste fluid;

[0035] Third, the present invention utilizes supercritical extraction technology to extract and purify the acidic drilling return fluid, thereby reducing the environmental pollution problem caused by the arbitrary discharge of the return fluid; at the same time, the mixing component designed in the present invention greatly improves the mixing effect and efficiency of supercritical CO2 and drilling return fluid, thereby further improving the extraction efficiency of the acidic drilling return fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a longitudinal sectional view of the present invention;

[0037] Figure 2 It is a front view of the present invention;

[0038] Figure 3 is a top view of the present invention;

[0039] Figure 4 is a distribution diagram of the mixing plates of the present invention inside the housing;

[0040] Figure 5 It is a schematic diagram of the connection between the mixing plate and the mounting plate of the present invention;

[0041] Figure 6 It is a schematic diagram of the connection between the mixing plate and the rotating shaft of the present invention;

[0042] Figure 7 It is a schematic diagram of the connection between the liquid inlet tray and the housing of the present invention;

[0043] Among them, 1-shell, 10-base, 11-separation chamber, 12-mixing chamber, 13-first collection tube, 14-second collection tube, 15-liquid guide tube, 16-pressure pump, 17-infrared heating plate, 18-liquid adding tube, 2-CO2 pressurizing component, 20-fixed frame, 21-pressurizing motor, 210-driving gear, 2100-protective shell, 22-piston cylinder, 220-intake pipe, 221-telescopic tube, 222-explosion-proof net, 23-screw, 230-pinion, 24-hollow disk, 25-rotating disk, 250- Nozzle, 3-mixing assembly, 30-mixing motor, 300-output shaft, 31-mounting plate, 310-arc groove, 32-mixing plate, 320-liquid uniformity tube, 3200-connecting rod, 3201-second gear sleeve, 3202-tooth plate, 321-rotating shaft, 3210-first gear sleeve, 322-sliding protrusion, 323-collision ball, 324-wedge slider, 4-separation assembly, 40-liquid inlet plate, 41-gas collecting plate, 42-separation tube, 420-main coil, 43-gas outlet pipe, 44-electric heating jacket, 5-condensation recovery tank. DETAILED DESCRIPTION

[0044] Example 1

[0045] like Figure 1 , 2 A supercritical extraction treatment device for waste flowback liquid from drilling is shown, comprising a shell 1, a CO2 pressurizing component 2, a mixing component 3 and a separation component 4; a base 10 is provided at the lower end of the shell 1, and a separation chamber 11 and a mixing chamber 12 are sequentially provided inside the shell 1 from top to bottom; a first collecting tube 13 and a second collecting tube 14 communicating with the separation chamber 11 are provided on the shell 1, and a liquid adding tube 18 and a discharge tube communicating with the mixing chamber 12 are provided on the shell 1; the separation chamber 11 and the mixing chamber 12 are connected by a liquid guiding tube 15, and a pressure pump 16 is provided at the connection; an infrared heating plate 17 is provided on the top of the shell 1;

[0046] like Figure 1 , 2 As shown, the CO2 pressurizing assembly 2 includes a fixing frame 20, a pressurizing motor 21 and a piston cylinder 22; the fixing frame 20 is arranged on the base 10 and is located outside the shell 1, the pressurizing motor 21 is arranged on the fixing frame 20, the output shaft of the pressurizing motor 21 passes through the fixing frame 20 and is provided with a driving gear 210; the piston cylinder 22 is sleeved on the top end of the outer shell 1, the piston cylinder 22 is provided with an intake pipe 220 and a telescopic tube 221 connected to the mixing chamber 12, and the telescopic tube 221 is provided with an electric control valve; the piston cylinder 22 is circumferentially threadedly connected with four lead screws 23 that are rotatably connected to the fixing frame 20 and the base 10 respectively, and each lead screw 23 is sleeved with a small gear 230 that is meshed and connected with the driving gear 210;

[0047] like Figure 1 , 4 As shown, the mixing assembly 3 includes a mixing motor 30, a mounting disc 31 and a mixing plate 32; the mixing motor 30 is arranged at the bottom of the housing 1, the output shaft 300 of the mixing motor 30 passes through the housing 1 and is rotatably engaged with the top of the mixing chamber 12, two mounting discs 31 are provided, and the two mounting discs 31 are respectively sleeved on the output shaft 300; six mixing plates 32 are provided, and are respectively movably engaged between the two mounting discs 31, and each mixing plate 32 is provided with a liquid homogenizing pipe 320;

[0048] like Figure 1 , 7 As shown, the separation component 4 includes a liquid inlet tray 40, an air collecting tray 41 and a separation tube 42. The liquid inlet tray 40 and the air collecting tray 41 are respectively arranged at the bottom and the top of the separation chamber 11. The liquid inlet tray 40 is connected to the liquid guide tube 15, and the air collecting tray 41 is connected to the first collecting tube 13. There are 9 separation tubes 42, each of which is arranged on the liquid inlet tray 40, and each of the separation tubes 42 is provided with an air outlet pipe 43 connected to the air collecting tray 41, and each of the separation tubes 42 is provided with an electric heating sleeve 44 on the outside. The pressure pump 16, the infrared heating plate 17, the pressurizing motor 21, the electric control valve, the mixing motor 30 and the electric heating sleeve 44 are all commercially available products.

[0049] Example 2

[0050] This embodiment records a method for supercritical extraction treatment of drilling return waste liquid using the device of Example 1, comprising the following steps:

[0051] S1, respectively connect the pressure pump 16, the infrared heating plate 17, the pressure motor 21, the electric control valve, the mixing motor 30 and the electric heating jacket 44 to an external power source;

[0052] S2, the drilling return waste liquid is introduced into the mixing chamber 12 through the liquid adding pipe 18, and then the external CO2 gas is introduced into the piston cylinder 22 through the air inlet pipe 220; the infrared heating plate 17 is turned on to heat the CO2 gas; at the same time, the pressure motor 21 is turned on, and the pressure motor 21 is used to drive the driving gear 210 to rotate, and the pinion 230 and the screw 23 are driven to rotate. At this time, the piston cylinder 22 moves along the outer wall of the shell 1 under the action of the screw 23, and finally the CO2 gas is converted into a supercritical fluid state;

[0053] S3, opening the electric control valve and the mixing motor 30, so that the supercritical CO2 enters the mixing chamber 12 through the telescopic tube 221 and mixes with the drilling return waste liquid; the mixing motor 30 drives the output shaft 300 to rotate, so that each mixing plate 32 rotates continuously under the action of the mounting plate 31, and the supercritical CO2 and the drilling return waste liquid are fully stirred and mixed;

[0054] S4. After the supercritical CO2 and the drilling return waste liquid are mixed, the pressure pump 16 and the electric heating sleeve 44 are turned on. The supercritical CO2 carries the pollutants in the drilling return waste liquid into the liquid inlet plate 40 through the liquid guide tube 15, and continuously rises through each separation tube 42. The electric heating sleeve 44 is used to heat each separation tube 42, so that the supercritical CO2 is gasified and enters the gas collecting plate 41 through the gas outlet pipe 43, and is finally discharged from the shell 1 through the first collecting pipe 13 for collection; the pollutants separated from the supercritical CO2 eventually flow into the separation chamber 11 through the ends of each separation tube 42, and are finally discharged from the shell 1 through the second collecting pipe 14 for collection; the treated drilling return waste liquid is discharged from the shell 1 through the discharge pipe.

[0055] Example 3

[0056] like Figure 1 , 2 A supercritical extraction treatment device for waste flowback liquid from drilling is shown, comprising a shell 1, a CO2 pressurizing component 2, a mixing component 3, a separation component 4 and a PLC controller; a base 10 is provided at the lower end of the shell 1, and a separation chamber 11 and a mixing chamber 12 are sequentially provided inside the shell 1 from top to bottom; a first collecting tube 13 and a second collecting tube 14 communicating with the separation chamber 11 are provided on the shell 1, and a liquid adding tube 18 and a discharge tube communicating with the mixing chamber 12 are provided on the shell 1; the separation chamber 11 and the mixing chamber 12 are connected by a liquid guiding tube 15, and a pressure pump 16 is provided at the connection; an infrared heating plate 17 is provided on the top of the shell 1;

[0057] like Figure 1 , 2As shown, the CO2 pressurizing assembly 2 includes a fixing frame 20, a pressurizing motor 21 and a piston cylinder 22; the fixing frame 20 is arranged on the base 10 and is located outside the shell 1, the pressurizing motor 21 is arranged on the fixing frame 20, the output shaft of the pressurizing motor 21 passes through the fixing frame 20 and is provided with a driving gear 210; the piston cylinder 22 is sleeved on the top end of the outer shell 1, the piston cylinder 22 is provided with an intake pipe 220 and a telescopic tube 221 connected to the mixing chamber 12, and the telescopic tube 221 is provided with an electric control valve; the piston cylinder 22 is circumferentially threadedly connected with four lead screws 23 that are rotatably connected to the fixing frame 20 and the base 10 respectively, and each lead screw 23 is sleeved with a small gear 230 that is meshed and connected with the driving gear 210;

[0058] like Figure 1 , 4 As shown, the mixing assembly 3 includes a mixing motor 30, a mounting disc 31 and a mixing plate 32; the mixing motor 30 is arranged at the bottom of the housing 1, the output shaft 300 of the mixing motor 30 passes through the housing 1 and is rotatably engaged with the top of the mixing chamber 12, two mounting discs 31 are provided, and the two mounting discs 31 are respectively sleeved on the output shaft 300; six mixing plates 32 are provided, and are respectively movably engaged between the two mounting discs 31, and each mixing plate 32 is provided with a liquid homogenizing pipe 320;

[0059] like Figure 1 , 7 As shown, the separation assembly 4 includes a liquid inlet tray 40, a gas collecting tray 41 and a separation tube 42, the liquid inlet tray 40 and the gas collecting tray 41 are respectively arranged at the bottom and top of the separation chamber 11, the liquid inlet tray 40 is connected to the liquid guide tube 15, and the gas collecting tray 41 is connected to the first collecting tube 13; 9 separation tubes 42 are provided, each of which is arranged on the liquid inlet tray 40, and each of the separation tubes 42 is provided with an outlet pipe 43 connected to the gas collecting tray 41, and each of the separation tubes 42 is provided with an electric heating jacket 44 on the outside;

[0060] The PLC controller is electrically connected to the pressure pump 16, the infrared heating plate 17, the pressurizing motor 21, the electric control valve, the mixing motor 30 and the electric heating sleeve 44 respectively; the PLC controller, the pressure pump 16, the infrared heating plate 17, the pressurizing motor 21, the electric control valve, the mixing motor 30 and the electric heating sleeve 44 are all commercially available products.

[0061] Example 4

[0062] This embodiment records a method for supercritical extraction treatment of drilling return waste liquid using the device of Example 3, comprising the following steps:

[0063] S1, respectively connect the pressure pump 16, the infrared heating plate 17, the pressure motor 21, the electric control valve, the mixing motor 30 and the electric heating jacket 44 to an external power source;

[0064] S2, the drilling return waste liquid is introduced into the mixing chamber 12 through the liquid adding pipe 18, and then the external CO2 gas is introduced into the piston cylinder 22 through the air inlet pipe 220; the infrared heating plate 17 and the pressure motor 21 are controlled by the PLC controller to turn on to heat the CO2 gas; the pressure motor 21 is used to drive the driving gear 210 to rotate, and the pinion 230 and the screw 23 are driven to rotate, at this time, the piston cylinder 22 moves along the outer wall of the shell 1 under the action of the screw 23, and finally the CO2 gas is converted into a supercritical fluid state;

[0065] S3, the electric control valve and the mixing motor 30 are controlled to open by the PLC controller, so that the supercritical CO2 enters the mixing chamber 12 through the telescopic tube 221 and mixes with the drilling return waste liquid; the mixing motor 30 drives the output shaft 300 to rotate, so that each mixing plate 32 rotates continuously under the action of the mounting plate 31, and the supercritical CO2 and the drilling return waste liquid are fully stirred and mixed;

[0066] S4. After the supercritical CO2 and the drilling return waste liquid are mixed, the pressure pump 16 and the electric heating sleeve 44 are turned on by the PLC controller. The supercritical CO2 carries the pollutants in the drilling return waste liquid into the liquid inlet plate 40 through the liquid guide tube 15, and continuously rises through each separation tube 42. The electric heating sleeve 44 is used to heat each separation tube 42, so that the supercritical CO2 is gasified and enters the gas collecting plate 41 through the gas outlet pipe 43, and is finally discharged from the shell 1 through the first collecting pipe 13 for collection; the pollutants separated from the supercritical CO2 eventually flow to the inside of the separation chamber 11 through the ends of each separation tube 42, and are finally discharged from the shell 1 through the second collecting pipe 14 for collection; the treated drilling return waste liquid is discharged from the shell 1 through the discharge pipe.

[0067] Example 5

[0068] like Figure 1 , 2 A supercritical extraction treatment device for waste flowback liquid from drilling is shown, comprising a shell 1, a CO2 pressurizing component 2, a mixing component 3, a separation component 4 and a PLC controller; a base 10 is provided at the lower end of the shell 1, and a separation chamber 11 and a mixing chamber 12 are sequentially provided inside the shell 1 from top to bottom; a first collecting tube 13 and a second collecting tube 14 communicating with the separation chamber 11 are provided on the shell 1, and a liquid adding tube 18 and a discharge tube communicating with the mixing chamber 12 are provided on the shell 1; the separation chamber 11 and the mixing chamber 12 are connected by a liquid guiding tube 15, and a pressure pump 16 is provided at the connection; an infrared heating plate 17 is provided on the top of the shell 1;

[0069] like Figure 1 , 2As shown, the CO2 pressurizing assembly 2 includes a fixing frame 20, a pressurizing motor 21 and a piston cylinder 22; the fixing frame 20 is arranged on the base 10 and is located outside the shell 1, the pressurizing motor 21 is arranged on the fixing frame 20, the output shaft of the pressurizing motor 21 passes through the fixing frame 20 and is provided with a driving gear 210; the piston cylinder 22 is sleeved on the top end of the outer shell 1, the piston cylinder 22 is provided with an intake pipe 220 and a telescopic tube 221 connected to the mixing chamber 12, and the telescopic tube 221 is provided with an electric control valve; the piston cylinder 22 is circumferentially threadedly connected with four lead screws 23 that are rotatably connected to the fixing frame 20 and the base 10 respectively, and the lead screw 23 is sleeved with a small gear 230 that is meshed and connected with the driving gear 210;

[0070] like Figure 1 , 4 As shown in Figures 5 and 6, the mixing assembly 3 includes a mixing motor 30, a mounting disk 31 and a mixing plate 32; the mixing motor 30 is arranged at the bottom of the housing 1, the output shaft 300 of the mixing motor 30 passes through the housing 1 and is rotatably connected with the top of the mixing chamber 12, two mounting disks 31 are provided, and the two mounting disks 31 are respectively sleeved on the output shaft 300; 6 mixing plates 32 are provided, and they are movably connected between the two mounting disks 31, and each mixing plate 32 is provided with a liquid homogenizing tube 320; the side of each mixing plate 32 close to the output shaft 300 is rotatably connected with the two mounting disks 31 through a rotating shaft 321, and the side of each mixing plate 32 away from the output shaft 300 is provided with a sliding protrusion 322, and the two mounting disks 31 are provided with a sliding protrusion The protrusion 322 is slidably engaged with the arc groove 310, and a return spring is arranged inside the arc groove 310; a collision ball 323 is arranged at one end of each mixing plate 32 close to the inner wall of the shell 1, and a wedge-shaped slider 324 is arranged on the inner wall of the shell 1 at a position corresponding to the position of each mixing plate 32; the rotating shaft 321 is rotatably engaged with the mixing plate 32, the rotating shaft 321 is fixedly connected to the mounting plate 31, and a first gear sleeve 3210 is sleeved on the rotating shaft 321; a plurality of liquid homogenizing tubes 320 are arranged, and each liquid homogenizing tube 320 in the vertical direction is connected by a connecting rod 3200, and each connecting rod 3200 is sleeved with a second gear sleeve 3201, and a gear plate 3202 meshingly connected with the first gear sleeve 3210 and the second gear sleeve 3201 is slidably engaged inside the mixing plate 32;

[0071] like Figure 1 , 7 As shown, the separation assembly 4 includes a liquid inlet tray 40, a gas collecting tray 41 and a separation tube 42, the liquid inlet tray 40 and the gas collecting tray 41 are respectively arranged at the bottom and top of the separation chamber 11, the liquid inlet tray 40 is connected to the liquid guide tube 15, and the gas collecting tray 41 is connected to the first collecting tube 13; 9 separation tubes 42 are provided, each of which is arranged on the liquid inlet tray 40, and each of the separation tubes 42 is provided with an outlet pipe 43 connected to the gas collecting tray 41, and each of the separation tubes 42 is provided with an electric heating jacket 44 on the outside;

[0072] The PLC controller is electrically connected to the pressure pump 16, the infrared heating plate 17, the pressurizing motor 21, the electric control valve, the mixing motor 30 and the electric heating sleeve 44 respectively; the PLC controller, the pressure pump 16, the infrared heating plate 17, the pressurizing motor 21, the electric control valve, the mixing motor 30 and the electric heating sleeve 44 are all commercially available products.

[0073] Example 6

[0074] This embodiment records a method for supercritical extraction treatment of drilling return waste liquid using the device of Example 5, comprising the following steps:

[0075] S1, respectively connect the pressure pump 16, the infrared heating plate 17, the pressure motor 21, the electric control valve, the mixing motor 30 and the electric heating jacket 44 to an external power source;

[0076] S2, the drilling return waste liquid is introduced into the mixing chamber 12 through the liquid adding pipe 18, and then the external CO2 gas is introduced into the piston cylinder 22 through the air inlet pipe 220; the infrared heating plate 17 and the pressure motor 21 are controlled by the PLC controller to turn on to heat the CO2 gas; the pressure motor 21 is used to drive the driving gear 210 to rotate, and the pinion 230 and the screw 23 are driven to rotate, at this time, the piston cylinder 22 moves along the outer wall of the shell 1 under the action of the screw 23, and finally the CO2 gas is converted into a supercritical fluid state;

[0077] S3, control the electric control valve and the mixing motor 30 to open through the PLC controller, so that the supercritical CO2 enters the mixing chamber 12 through the telescopic tube 221 and mixes with the drilling return waste liquid; use the mixing motor 30 to drive the output shaft 300 to rotate, so that each mixing plate 32 rotates continuously under the action of the mounting plate 31, and the supercritical CO2 and the drilling return waste liquid are fully stirred and mixed; when the mounting plate 31 rotates with the output shaft 300, the collision ball 323 on the mixing plate 32 collides with the wedge-shaped slider 324 and then slides a certain distance along the arc groove 310. At this time, the drilling return waste liquid changes its flow direction after passing through the liquid homogenizing pipe 320. When the mixing plate 32 rotates on the rotating shaft 321, the tooth plate 3202 moves along the mixing plate 32 under the action of the first tooth sleeve 3210, and the connecting rod 3200 rotates a certain angle under the action of the second tooth sleeve 3201, thereby realizing the change of the homogenizing direction of the liquid homogenizing pipe 320;

[0078] S4. After the supercritical CO2 and the drilling return waste liquid are mixed, the pressure pump 16 and the electric heating sleeve 44 are turned on by the PLC controller. The supercritical CO2 carries the pollutants in the drilling return waste liquid into the liquid inlet plate 40 through the liquid guide tube 15, and continuously rises through each separation tube 42. The electric heating sleeve 44 is used to heat each separation tube 42, so that the supercritical CO2 is gasified and enters the gas collecting plate 41 through the gas outlet pipe 43, and is finally discharged from the shell 1 through the first collecting pipe 13 for collection; the pollutants separated from the supercritical CO2 eventually flow to the inside of the separation chamber 11 through the ends of each separation tube 42, and are finally discharged from the shell 1 through the second collecting pipe 14 for collection; the treated drilling return waste liquid is discharged from the shell 1 through the discharge pipe.

[0079] Example 7

[0080] like Figure 1 , 2 , 3, a drilling return waste liquid supercritical extraction treatment device comprises a shell 1, a CO2 pressurizing component 2, a mixing component 3, a separation component 4 and a PLC controller; a base 10 is provided at the lower end of the shell 1, and a separation chamber 11 and a mixing chamber 12 are sequentially provided inside the shell 1 from top to bottom; a first collecting tube 13 and a second collecting tube 14 communicating with the separation chamber 11 are provided on the shell 1, and a liquid adding tube 18 and a discharge tube communicating with the mixing chamber 12 are provided on the shell 1; the separation chamber 11 and the mixing chamber 12 are connected by a liquid guide tube 15, and a pressure pump 16 is provided at the connection; an infrared heating plate 17 is provided on the top of the shell 1; a condensation recovery tank 5 connected to the first collecting tube 13 is provided on the base 10:

[0081] like Figure 1 , 2As shown, the CO2 pressurizing assembly 2 includes a fixing frame 20, a pressurizing motor 21 and a piston cylinder 22; the fixing frame 20 is arranged on the base 10 and is located outside the shell 1, the pressurizing motor 21 is arranged on the fixing frame 20, the output shaft of the pressurizing motor 21 passes through the fixing frame 20 and is provided with a driving gear 210; the fixing frame 20 is provided with a protective shell 2100 located outside the driving gear 210; the piston cylinder 22 is sleeved on the top end of the outer shell 1, the piston cylinder 22 is provided with an intake pipe 220 and a telescopic pipe 221 connected to the mixing chamber 12, and the telescopic pipe 221 is provided with an electric control valve; the piston cylinder 22 is provided with a protective shell 2100 located outside the driving gear 210; the piston cylinder 22 is sleeved on the top end of the outer shell 1, and the piston cylinder 22 is provided with an air intake pipe 220 and a telescopic pipe 221 connected to the mixing chamber 12, and the telescopic pipe 221 is provided with an electric control valve; Four screws 23 are respectively connected to the fixed frame 20 and the base 10 for rotation and clamping, and the screws 23 are sleeved with a small gear 230 meshing with the driving gear 210; a pressure sensor and a temperature sensor are arranged inside the piston cylinder 22; a hollow disk 24 sleeved on the output shaft 300 of the mixing motor 30 is arranged at the bottom of the mixing chamber 12, and a rotating disk 25 connected to the output shaft 300 of the mixing motor 30 is rotatably clamped inside the hollow disk 24, and a plurality of nozzles 250 are arranged on the upper end of the rotating disk 25; the hollow disk 24 is connected to the telescopic tube 221; an explosion-proof net 222 is sleeved on the outside of the piston cylinder 22;

[0082] like Figure 1 , 4 As shown in Figures 5 and 6, the mixing assembly 3 includes a mixing motor 30, a mounting disk 31 and a mixing plate 32; the mixing motor 30 is arranged at the bottom of the housing 1, the output shaft 300 of the mixing motor 30 passes through the housing 1 and is rotatably connected with the top of the mixing chamber 12, two mounting disks 31 are provided, and the two mounting disks 31 are respectively sleeved on the output shaft 300; 6 mixing plates 32 are provided, and they are movably connected between the two mounting disks 31, and each mixing plate 32 is provided with a liquid homogenizing tube 320; the side of each mixing plate 32 close to the output shaft 300 is rotatably connected with the two mounting disks 31 through a rotating shaft 321, and the side of each mixing plate 32 away from the output shaft 300 is provided with a sliding protrusion 322, and the two mounting disks 31 are provided with a sliding protrusion The protrusion 322 is slidably engaged with the arc groove 310, and a return spring is arranged inside the arc groove 310; a collision ball 323 is arranged at one end of each mixing plate 32 close to the inner wall of the shell 1, and a wedge-shaped slider 324 is arranged on the inner wall of the shell 1 at a position corresponding to the position of each mixing plate 32; the rotating shaft 321 is rotatably engaged with the mixing plate 32, the rotating shaft 321 is fixedly connected to the mounting plate 31, and a first gear sleeve 3210 is sleeved on the rotating shaft 321; a plurality of liquid homogenizing tubes 320 are arranged, and each liquid homogenizing tube 320 in the vertical direction is connected by a connecting rod 3200, and each connecting rod 3200 is sleeved with a second gear sleeve 3201, and a gear plate 3202 meshingly connected with the first gear sleeve 3210 and the second gear sleeve 3201 is slidably engaged inside the mixing plate 32;

[0083] like Figure 1 , 7As shown, the separation assembly 4 includes a liquid inlet tray 40, a gas collecting tray 41 and a separation tube 42, the liquid inlet tray 40 and the gas collecting tray 41 are respectively arranged at the bottom and top of the separation chamber 11, the liquid inlet tray 40 is connected to the liquid guide tube 15, and the gas collecting tray 41 is connected to the first collection tube 13; there are 9 separation tubes 42, each of which is arranged on the liquid inlet tray 40, and each of the separation tubes 42 is provided with an outlet pipe 43 that is connected to the gas collecting tray 41, and each of the separation tubes 42 is provided with an electric heating sleeve 44 on the outside; the top of each separation tube 42 is connected and conducted through a main coil 420, and the main coil 420 is connected to the second collection tube 14;

[0084] The PLC controller is electrically connected to the pressure sensor, temperature sensor, pressure pump 16, infrared heating plate 17, pressurizing motor 21, electric control valve, mixing motor 30 and electric heating sleeve 44 respectively; the PLC controller, pressure sensor, temperature sensor, pressure pump 16, infrared heating plate 17, pressurizing motor 21, electric control valve, mixing motor 30 and electric heating sleeve 44 are all commercially available products.

[0085] Example 8

[0086] This embodiment describes a method for supercritical extraction treatment of drilling return waste liquid using the device of Example 7, comprising the following steps:

[0087] S1, respectively connect the pressure pump 16, the infrared heating plate 17, the pressure motor 21, the electric control valve, the mixing motor 30 and the electric heating jacket 44 to an external power source;

[0088] S2, the drilling return waste liquid is introduced into the mixing chamber 12 through the liquid adding pipe 18, and then the external CO2 gas is introduced into the piston cylinder 22 through the air inlet pipe 220; the infrared heating plate 17 and the pressurizing motor 21 are controlled to be turned on by the PLC controller to heat the CO2 gas; the pressurizing motor 21 is used to drive the driving gear 210 to rotate, and the pinion 230 and the lead screw 23 are driven to rotate. At this time, the piston cylinder 22 moves along the outer wall of the shell 1 under the action of the lead screw 23 to compress and heat the CO2. The internal pressure and temperature of the piston cylinder 22 are monitored in real time by the temperature sensor and the pressure sensor. When the internal pressure and temperature of the piston cylinder 22 reach the critical value of the gaseous CO2, the infrared heating plate 17 and the pressurizing motor 21 are controlled to be turned off by the PLC controller;

[0089] S3, the electric control valve and the mixing motor 30 are controlled by the PLC controller to open, so that the supercritical CO2 enters the mixing chamber 12 through the telescopic tube 221 and mixes with the drilling return waste liquid; the mixing motor 30 is used to drive the output shaft 300 to rotate, and when the output shaft 300 rotates, the rotating disk 25 is driven to rotate along the hollow disk 24, so that the supercritical CO2 is sprayed into the drilling return waste liquid through the nozzle 250, and at the same time, each mixing plate 32 is continuously rotated under the action of the mounting plate 31, so that the supercritical CO2 and the drilling return waste liquid are mixed. The mixing plate 31 is fully stirred and mixed; when the mounting plate 31 rotates with the output shaft 300, the collision ball 323 on the mixing plate 32 collides with the wedge-shaped slider 324 and then slides a certain distance along the arc groove 310. At this time, the drilling return waste liquid changes its flow direction after passing through the liquid homogenizing pipe 320. When the mixing plate 32 rotates on the rotating shaft 321, the tooth plate 3202 moves along the mixing plate 32 under the action of the first tooth sleeve 3210, and the connecting rod 3200 rotates a certain angle under the action of the second tooth sleeve 3201, thereby realizing the change of the homogenizing direction of the liquid homogenizing pipe 320;

[0090] S4. After the supercritical CO2 and the drilling return waste liquid are mixed, the pressure pump 16 and the electric heating sleeve 44 are turned on by the PLC controller. The supercritical CO2 carries the pollutants in the drilling return waste liquid into the liquid inlet plate 40 through the liquid guide tube 15, and continuously rises through each separation tube 42. The electric heating sleeve 44 is used to heat each separation tube 42, so that the supercritical CO2 is gasified and enters the gas collecting plate 41 through the gas outlet pipe 43, and finally enters the condensation recovery tank 5 through the first collection pipe 13 for condensation and recovery; the pollutants separated from the supercritical CO2 finally enter the main coil 420 through the ends of each separation tube 42, and finally discharged from the shell 1 through the second collection pipe 14 for collection; the treated drilling return waste liquid is discharged from the shell 1 through the discharge pipe.

Claims

1. A supercritical extraction treatment device for drilling wastewater, characterized in that: The invention comprises a shell (1), a CO2 pressurizing component (2), a mixing component (3) and a separation component (4); a base (10) is arranged at the lower end of the shell (1), and a separation chamber (11) and a mixing chamber (12) are arranged in sequence from top to bottom inside the shell (1); a first collecting tube (13) and a second collecting tube (14) which are in communication with the separation chamber (11) are arranged on the shell (1), and a liquid adding tube (18) and a discharge tube which are in communication with the mixing chamber (12) are arranged on the shell (1); the separation chamber (11) and the mixing chamber (12) are connected via a liquid guiding tube (15), and a pressure pump (16) is arranged at the connection; an infrared heating plate (17) is arranged on the top of the shell (1); The CO2 pressurizing component (2) comprises a fixing frame (20), a pressurizing motor (21) and a piston cylinder (22); the fixing frame (20) is arranged on the base (10) and is located outside the shell (1); the pressurizing motor (21) is arranged on the fixing frame (20); the output shaft of the pressurizing motor (21) passes through the fixing frame (20) and is provided with a driving gear (210); the piston cylinder (22) is sleeved on the top end of the outer side of the shell (1); the piston cylinder (22) is provided with an air intake pipe (220) and a telescopic tube (221) connected to the mixing chamber (12); the telescopic tube (221) is provided with an electric control valve; the piston cylinder (22) is circumferentially threadedly connected with a lead screw (23) which is rotatably engaged with the fixing frame (20) and the base (10) respectively; the lead screw (23) is sleeved with a pinion (230) which is meshed with the driving gear (210); The mixing assembly (3) comprises a mixing motor (30), a mounting plate (31) and a mixing plate (32); the mixing motor (30) is arranged at the bottom of the housing (1); the output shaft (300) of the mixing motor (30) passes through the housing (1) and is rotatably engaged with the top of the mixing chamber (12); two mounting plates (31) are provided, and the two mounting plates (31) are respectively sleeved on the output shaft (300); a plurality of mixing plates (32) are provided, and are respectively movably engaged between the two mounting plates (31); and each mixing plate (32) is provided with a liquid homogenizing pipe (320); The separation component (4) comprises a liquid inlet tray (40), a gas collecting tray (41) and a separation tube (42); the liquid inlet tray (40) and the gas collecting tray (41) are respectively arranged at the bottom and top of the separation chamber (11); the liquid inlet tray (40) is connected to the liquid guide tube (15); and the gas collecting tray (41) is connected to the first collecting tube (13); a plurality of separation tubes (42) are arranged, each of which is arranged on the liquid inlet tray (40); and each of the separation tubes (42) is provided with an outlet tube (43) which is in communication with the gas collecting tray (41); and each of the separation tubes (42) is provided with an electric heating sleeve (44) on the outside.

2. A supercritical extraction treatment device for drilling waste flowback liquid according to claim 1, characterized in that: It also includes a PLC controller, which is electrically connected to the pressure pump (16), the infrared heating plate (17), the pressure motor (21), the electric control valve, the mixing motor (30) and the electric heating jacket (44).

3. A supercritical extraction treatment device for drilling waste flowback liquid according to claim 2, characterized in that: A pressure sensor and a temperature sensor which are electrically connected to the PLC controller respectively are arranged inside the piston cylinder (22).

4. The supercritical extraction treatment device for drilling waste flowback liquid according to claim 1, characterized in that: The bottom of the mixing chamber (12) is provided with a hollow disk (24) sleeved on the output shaft (300) of the mixing motor (30); a rotating disk (25) connected to the output shaft (300) of the mixing motor (30) is rotatably engaged inside the hollow disk (24); a plurality of nozzles (250) are provided at the upper end of the rotating disk (25); and the hollow disk (24) is in communication with the telescopic tube (221).

5. The supercritical extraction treatment device for drilling waste flowback liquid according to claim 1, characterized in that: The side of each mixing plate (32) close to the output shaft (300) is rotatably engaged with the two mounting plates (31) via a rotating shaft (321); the side of each mixing plate (32) away from the output shaft (300) is provided with a sliding protrusion (322); the two mounting plates (31) are provided with an arc groove (310) slidably engaged with the sliding protrusion (322); a return spring is provided inside the arc groove (310); a collision ball (323) is provided at one end of each mixing plate (32) close to the inner wall of the shell (1); and a wedge-shaped sliding block (324) is provided at a position on the inner wall of the shell (1) corresponding to the position of each mixing plate (32).

6. A supercritical extraction treatment device for drilling waste flowback liquid according to claim 5, characterized in that: The rotating shaft (321) is rotatably engaged with the mixing plate (32), the rotating shaft (321) is fixedly connected with the mounting plate (31), and a first gear sleeve (3210) is sleeved on the rotating shaft (321); a plurality of liquid homogenizing tubes (320) are provided, and each liquid homogenizing tube (320) in the vertical direction is connected by a connecting rod (3200), and each connecting rod (3200) is sleeved with a second gear sleeve (3201), and a gear plate (3202) meshingly engaged with the first gear sleeve (3210) and the second gear sleeve (3201) is slidably engaged inside the mixing plate (32).

7. The supercritical extraction treatment device for drilling waste flowback liquid according to claim 1, characterized in that: The piston cylinder (22) is externally covered with an explosion-proof net (222).

8. The supercritical extraction treatment device for drilling waste flowback liquid according to claim 1, characterized in that: The fixing frame (20) is provided with a protective shell (2100) located outside the driving gear (210).

9. A method for supercritical extraction treatment of drilling flowback waste liquid using the device described in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, respectively connecting the pressure pump (16), the infrared heating plate (17), the pressure motor (21), the electric control valve, the mixing motor (30) and the electric heating jacket (44) to an external power source; S2, the drilling return waste liquid is introduced into the mixing chamber (12) through the liquid adding pipe (18), and then the external CO2 gas is introduced into the piston cylinder (22) through the air inlet pipe (220); the infrared heating plate (17) is turned on to heat the CO2 gas; at the same time, the pressure motor (21) is turned on, and the pressure motor (21) is used to drive the driving gear (210) to rotate, and the pinion (230) and the lead screw (23) are driven to rotate. At this time, the piston cylinder (22) moves along the outer wall of the shell (1) under the action of the lead screw (23), and finally the CO2 gas is converted into a supercritical fluid state; S3, opening the electric control valve and the mixing motor (30), so that the supercritical CO2 enters the mixing chamber (12) through the telescopic tube (221) and mixes with the drilling return waste liquid; using the mixing motor (30) to drive the output shaft (300) to rotate, so that each mixing plate (32) continuously rotates under the action of the mounting plate (31), and the supercritical CO2 and the drilling return waste liquid are fully stirred and mixed; S4. After the supercritical CO2 and the drilling return waste liquid are mixed, the pressure pump (16) and the electric heating sleeve (44) are turned on, and the supercritical CO2 carries the pollutants in the drilling return waste liquid into the liquid inlet plate (40) through the liquid guide tube (15), and continuously rises through each separation tube (42). The electric heating sleeve (44) is used to heat each separation tube (42), so that the supercritical CO2 is gasified and enters the gas collecting plate (41) through the gas outlet pipe (43), and finally discharged from the shell (1) through the first collection pipe (13) for collection; the pollutants separated from the supercritical CO2 finally flow into the separation chamber (11) through the ends of each separation tube (42), and finally discharged from the shell (1) through the second collection pipe (14) for collection, and the treated drilling return waste liquid is discharged from the shell (1) through the discharge pipe.

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