CN112983320A - Slurry circulating device and using method thereof - Google Patents

Abstract

The invention relates to the technical field of petroleum drilling equipment, in particular to a mud circulation device and a use method thereof. The mud circulation device provided by the invention has high degassing efficiency, can be used for removing sand while degassing, reduces the occupied area of equipment and the occupied area, has a short mud treatment process, and improves the construction efficiency of a drilling process.

Description

Slurry circulating device and using method thereof

Technical Field

The invention relates to the technical field of petroleum drilling equipment, in particular to a mud circulation device and a use method thereof.

Background

Drilling mud is generally referred to as drilling fluid, which is a generic term for various circulating fluids that serve their various functions in the drilling process to meet the needs of the drilling operation. The drilling mud has the functions of carrying and suspending rock debris in a shaft, balancing formation pressure, cooling and lubricating a drill bit and a drilling tool, protecting a well wall and an oil-gas layer, improving drilling speed and the like, and has very important functions in the drilling process. The waste drilling mud is a multiphase stable colloidal suspension system, contains various inorganic salts, organic treating agents, polymers, surfactants and other substances, wherein oils, salts, drilling mud additives and soluble heavy metal ions contained in the waste drilling mud pollute soil and water, influence the growth of animals and plants and harm the health of human beings, and the waste drilling mud needs to be treated in time.

In the prior art, four mud circulation tanks are generally adopted to carry out four-stage solid control system treatment when the gas-immersed drilling waste mud is treated, and the treatment process is as follows: and the waste drilling mud primarily screened by the vibrating screen is subjected to degassing, desanding, desilting and centrifugal separation sequentially through the four mud circulation tanks, and the treated drilling mud is reused in the drilling process. When the four-level solid control system is used, the degassing efficiency is low, the equipment occupies a large amount, the occupied area is large, the mud treatment process is long, and the like, so that the construction efficiency of the drilling process is influenced.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present invention provides a slurry circulation device, comprising a tank body with an opening at the top end and a cover body covering the tank body, wherein a slurry inlet is arranged above the side wall of the tank body, a slurry outlet is arranged below the side wall, a sand discharge port is arranged at the bottom,

the improved vacuum pump is characterized in that a vacuum cavity is arranged inside the cover body, a water-gas isolator is arranged in the vacuum cavity, a first gas port of the water-gas isolator is communicated with the tank body, a second gas port of the water-gas isolator is communicated with the vacuum cavity, a vacuum pump interface is arranged at the top of the vacuum cavity, a stirring device is arranged below the cover body, a servo motor is arranged above the cover body, one end of a vertically arranged rotating shaft is connected with the output end of the servo motor, and the other end.

The tank body and the cover body can be detachably arranged, so that the installation and the maintenance of each mechanical part are convenient. After the cover body is covered by the cover body, the stirring device is immersed below a mud liquid level line in the tank body, and the mud is stirred by the stirring device, so that the gas-liquid separation speed of the mud is accelerated. The external vacuum pump of vacuum pump interface carries out the evacuation to the vacuum cavity in the lid, makes the vacuum cavity in keep the negative pressure state, and the gas that separates out in jar body 1 loops through the first gas port and the second gas port entering vacuum cavity of aqueous vapor isolator, makes mud carry out the degasification fast.

Preferably, the stirring device comprises a filter cylinder, an outer spiral surrounding the outer side wall of the filter cylinder and an inner spiral surrounding the inner side wall of the filter cylinder, the upper end and the lower end of the filter cylinder are sealed, the upper end surface of the filter cylinder is fixedly connected with a rotating shaft, the lower end surface of the filter cylinder is provided with a central hole, and the side wall of the filter cylinder is provided with a first filter hole.

Preferably, the spiral directions of the outer spiral and the inner spiral are opposite, the outer spiral is provided with a second filter hole and a first spine portion, and the inner spiral is provided with a third filter hole and a second spine portion.

Preferably, a first partition plate is arranged in the tank body, a sand depositing hole and a slurry branch pipe vertically penetrating through the first partition plate are arranged on the first partition plate, one end of the slurry branch pipe is inserted into the central hole of the filter cylinder, the other end of the slurry branch pipe is communicated with a horizontally arranged slurry pipe, the slurry pipe is communicated with the slurry outlet, a second electromagnetic valve is arranged on the slurry outlet, and a third electromagnetic valve is arranged on the sand discharge port.

Preferably, the lid is bottom open-ended hollow structure, and inside is equipped with horizontally second baffle, and the bottom is equipped with the filter screen, the second baffle with the lid encloses to close and forms the vacuum cavity, the first gas port of aqueous vapor isolator is in the second baffle with extend between the filter screen, second gas port intercommunication blast pipe, the blast pipe includes first exhaust end and second exhaust end, first exhaust end is sealed to be run through lid and external intercommunication are equipped with the fifth solenoid valve on it, second exhaust end intercommunication the vacuum cavity is equipped with the sixth solenoid valve on it.

Preferably, a lifting seat and the vacuum pump interface are arranged at the center of the top of the cover body; rotatory lifting devices is connected to the seat that goes up and down, the external vacuum pump of vacuum pump interface is equipped with the fourth solenoid valve on it, the top of lid still is equipped with vacuum sensor and level sensor, vacuum sensor extends to in the vacuum chamber, level sensor extends to in the jar body.

Preferably, the stirring device is provided with at least two stirring devices along the length direction of the tank body, the filter screen is provided with a fourth filtering hole and a through hole for the stirring device to pass through in a rotating manner, two baffles are arranged between every two adjacent through holes at intervals, the two baffles and the filter screen enclose to form a stable flow area, a turning blade is arranged in the fourth filtering hole of the stable flow area, the turning blade can turn over along with the change of mud pressure, and the water-air isolator is arranged above the stable flow area.

Preferably, the turning blade comprises a fixed shaft fixed in the fourth filter hole, the fixed shaft is connected with semicircular fan blades through a pivot, the two ends of the fixed shaft are sleeved with torsion springs, one end of each torsion spring is fixed on the fixed shaft, and the other end of each torsion spring is fixed on the fan blades.

A use method of a mud circulation device comprises the following steps:

step S100, connecting a servo motor, a vacuum sensor, a liquid level sensor, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve and a sixth electromagnetic valve to a PLC (programmable logic controller), connecting the PLC to an HMI (human machine interface), and setting a minimum vacuum degree parameter, a maximum vacuum degree parameter, a liquid level value parameter, a rotating speed parameter and a time parameter of the servo motor in the HMI;

s200, controlling a fourth electromagnetic valve to open by a PLC (programmable logic controller), vacuumizing the vacuum cavity by a vacuum pump to enable the vacuum cavity to be in a negative pressure state, closing the fourth electromagnetic valve when a pressure value reaches a minimum vacuum degree parameter, and stopping vacuumizing;

s300, controlling a first electromagnetic valve to be opened by a PLC (programmable logic controller), injecting the slurry into the tank body through a slurry inlet, detecting the level value of the slurry by a liquid level sensor, closing the first electromagnetic valve when the set level value parameter is reached, and stopping slurry injection;

s400, the PLC controls a servo motor to start rotating, a stirring device starts stirring, and a first filtering hole in a filter cylinder, a second filtering hole and a first pointed spine part in an outer spiral and a third filtering hole and a second pointed spine part in an inner spiral extrude and pierce air bubbles in slurry;

s500, controlling a sixth electromagnetic valve to be opened by a PLC (programmable logic controller), enabling gas in the slurry to enter a vacuum cavity through a water-gas isolator, closing the sixth electromagnetic valve when the pressure in the vacuum cavity reaches a maximum vacuum degree parameter, opening the fourth electromagnetic valve, vacuumizing the vacuum cavity by a vacuum pump, closing the fourth electromagnetic valve when the pressure in the vacuum cavity reaches a minimum vacuum degree parameter, stopping vacuumizing, re-opening the sixth electromagnetic valve, and enabling the gas in the slurry to continuously enter the vacuum cavity through the water-gas isolator;

s600, after a set time parameter is reached, the PLC controls the servo motor to be closed, the fifth electromagnetic valve is opened, and the vacuum cavity is communicated with the outside through an exhaust pipe to release pressure;

s700, controlling a second electromagnetic valve to be opened by a PLC controller, pumping slurry from a slurry outlet by a slurry pump, enabling the slurry in the tank body to pass through a filter cylinder, enter a slurry pipe through a slurry branch pipe, and finally being pumped out of the tank body through a slurry outlet to enter the next process flow;

and S800, controlling the third electromagnetic valve to open by the PLC, and discharging the deposited silt out of the tank body through a sand discharge port.

A slurry circulation process comprising the steps of:

step S10, primarily screening the mud by a vibrating screen, enabling the liquid phase to enter the mud circulating device, and conveying the solid phase to a drill chip drying machine by a screw conveyor;

step S20, degassing and desanding the slurry in the slurry circulating device, conveying the slurry liquid phase subjected to degassing and desanding to a first slurry tank through a slurry pump, and conveying the solid phase to a drill chip drying machine through a screw conveyor;

step S30, connecting the first mud tank with a mud remover to remove mud from mud, conveying the liquid phase of the mud after mud removal to the second mud tank through a mud pump, and conveying the solid phase to a drill chip drying machine through a screw conveyor;

step S40, connecting the second mud tank with a centrifuge to centrifugally separate mud, enabling the separated mud to enter a mud storage bin, and conveying a solid phase to a drill chip drying machine through a screw conveyor;

s50, collecting a dried solid phase by a drill cutting drying machine, and refluxing a liquid phase which is dried back to the vibrating screen;

and step S60, injecting the mud in the mud storage bin into the drilled well to establish circulation.

Compared with the prior art, the invention has the following beneficial technical effects:

1. in the mud circulating device provided by the invention, the tank body, the cover body, the water-gas isolator and the stirring device form a degassing structure together, mud is contained in the tank body, the cover body is provided with the negative pressure vacuum cavity, gas in the mud is separated through the water-gas isolator, the gas-liquid separation efficiency is improved by matching with the stirring device, and the mud can be degassed rapidly;

2. the stirring device adopts a structure combining the filter cylinder, the inner spiral and the outer spiral, so that the extrusion and puncture effects of the stirring device on bubbles in the slurry are improved, and the gas-liquid separation efficiency is further improved;

3. the filter cylinder, the slurry branch pipe and the slurry pipe form a desanding structure together, desanding is carried out when the slurry is degassed and enters the next process link, and the effects of degassing and desanding are simultaneously realized in the same slurry circulating device, so that the using amount of equipment is reduced, and the process efficiency is improved;

4. a filter screen is arranged below the second partition plate on the cover body to form a protective layer, gravel in the slurry is prevented from contacting the water-gas isolator through the filter screen, and the water-gas isolator is prevented from being abraded and scratched due to the scouring of the gravel;

5. two baffle plates are arranged on the filter screen right below the water-gas isolator to form a stable flow area, so that the impact force of slurry on the water-gas isolator is reduced, and a plurality of turning blades are arranged in the filter screen between the two baffle plates, so that the impact force of the slurry on the water-gas isolator can be further reduced through the forced turning of the turning blades, and equipment is protected;

6. the mud circulation process provided by the invention can realize the effects of degassing and desanding simultaneously in one mud circulation device, improve the utilization rate and the process efficiency of equipment, and reduce the use amount and the occupied area of the equipment;

in conclusion, the mud circulation device provided by the invention has high degassing efficiency, can be used for removing sand while degassing, reduces the occupied space and the occupied area of equipment, has a short mud treatment process and improves the construction efficiency of a drilling process.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a right side view of the present invention;

FIG. 4 is a schematic structural view of the stirring device in FIG. 2;

FIG. 5 is a schematic structural view of the tank of FIG. 2;

FIG. 6 is a schematic structural diagram of the cover in FIG. 2;

FIG. 7 is a schematic view of a screen configuration;

FIG. 8 is a schematic structural view of the turning vane of FIG. 7;

FIG. 9 is a diagram of a control system for a method of use of the present invention;

FIG. 10 is a flow chart of a mud circulation process.

Description of reference numerals:

1. a tank body, 2, a cover body, 3, a stirring device, 4, a rotating shaft, 5, a servo motor, 6, a water-gas isolator, 7, an exhaust pipe, 8, a vacuum sensor, 9 and a liquid level sensor,

11. a slurry inlet 111, a first electromagnetic valve 12, a slurry outlet 121, a second electromagnetic valve 13, a sand discharge port 131, a third electromagnetic valve 14, a first clapboard 141, a sand setting hole 142, a slurry branch pipe 143 and a slurry pipe,

21. a second clapboard, 211, a vacuum cavity, 22, a vacuum pump interface, 221, a fourth electromagnetic valve, 23, a filter screen, 231, a fourth filter hole, 232, a through hole, 233, a baffle plate, 234, a turning blade, 2341, a fixed shaft, 2342, a fan blade, 2343, a torsion spring, 24 and a lifting seat,

31. 311, a first filtering hole, 312, a central hole, 32, an external screw, 321, a second filtering hole, 322, a first spine part, 33, an internal screw, 331, a third filtering hole, 332, a second spine part,

61. the first air port, 62, the second air port,

71. a first exhaust port 711, a fifth solenoid valve 72, a second exhaust port 721 and a sixth solenoid valve.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples:

it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions which are within the scope of the disclosure should be understood and encompassed by the present disclosure without affecting the efficacy and attainment of the same.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 3, the present invention provides a slurry circulation device, which comprises a tank body 1 with an open top end and a cover body 2 covering the tank body 1, wherein a slurry inlet 11 is arranged above the side wall of the tank body 1, a slurry outlet 12 is arranged below the side wall, a sand discharge port 13 is arranged at the bottom,

the inside vacuum chamber 211 that is equipped with of lid 2, be equipped with aqueous vapor isolator 6 in the vacuum chamber 211, the first gas port 61 intercommunication of aqueous vapor isolator 6 jar body 1, second gas port 62 intercommunication vacuum chamber 211, the vacuum chamber 211 top is equipped with vacuum pump interface 22, lid 2 below is equipped with agitating unit 3, and the top is equipped with servo motor 5, and 4 one end of vertical pivot of setting are connected servo motor 5's output, the other end is connected agitating unit 3.

Among the above-mentioned technical scheme, jar body 1 and lid 2 detachable setting, the installation and the maintenance of each mechanical parts of being convenient for. After the cover body 2 is covered on the tank body 1, the stirring device 3 is immersed under the mud liquid level line in the tank body 1, and the mud is stirred by the stirring device 3, so that the gas-liquid separation speed of the mud is accelerated. The vacuum pump interface 22 is externally connected with a vacuum pump, and is used for vacuumizing the vacuum cavity 211 in the cover body 2, so that the vacuum cavity 211 is kept in a negative pressure state, and gas separated from the tank body 1 sequentially passes through the first gas port 61 and the second gas port 62 of the water-gas isolator 6 to enter the vacuum cavity 211, so that mud can be degassed rapidly.

In a specific embodiment, the specific technical solution of the stirring device 3 is as follows: as shown in fig. 4, the stirring device 3 includes a filter cartridge 31, an outer spiral 32 surrounding the outer side wall of the filter cartridge 31, and an inner spiral 33 surrounding the inner side wall of the filter cartridge 31, wherein the upper and lower ends of the filter cartridge 31 are sealed, the upper end surface is fixedly connected with the rotating shaft 4, the lower end surface is provided with a central hole 312, and the side wall is provided with a first filtering hole 311.

The spiral directions of the outer spiral 32 and the inner spiral 33 are opposite, the outer spiral 32 is provided with a second filter hole 321 and a first spike portion 322, and the inner spiral 33 is provided with a third filter hole 331 and a second spike portion 332.

In the above technical solution, the first filtering holes 311 of the filter cartridge 31 can crush bubbles in the slurry through rotational shearing, and can also filter out large gravel particles in the slurry, so as to desand the slurry entering the filter cartridge 31, the outer spiral 32 and the inner spiral 33 enable the slurry to form a rotational flow in the stirring process, so as to promote gas-liquid separation, and the second filtering holes 321 and the first sharp-pointed portions 322 on the outer spiral 32 and the third filtering holes 331 and the second sharp-pointed portions 332 on the inner spiral 33 cooperate to crush bubbles in the slurry, so as to further promote gas-liquid separation efficiency. The spiral directions of the outer spiral 32 and the inner spiral 33 are preferably opposite, so that the generated vortex center is prevented from being too large, bubbles are introduced into the slurry, and the bubbles can be extruded by convection to promote the crushing.

In a specific embodiment, the specific technical scheme of the tank body 1 is as follows: as shown in fig. 5, a first partition plate 14 is arranged in the tank body 1, a sand setting hole 141 and a slurry branch pipe 142 vertically penetrating through the first partition plate 14 are arranged on the first partition plate 14, one end of the slurry branch pipe 142 is inserted into a central hole 312 of the filter cartridge 31, the other end is communicated with a horizontally arranged slurry pipe 143, the slurry pipe 143 is communicated with the slurry outlet 12, a second electromagnetic valve 121 is arranged on the slurry outlet 12, and a third electromagnetic valve 131 is arranged on the sand discharge port 13.

In the technical scheme, the first partition plate 14 divides the tank body 1 into an upper stirring area and a lower sand settling area, gravel in slurry enters the sand settling area through the sand settling hole 141 for temporary storage, the slurry branch pipe 142 is inserted into the central hole 312 of the filter cylinder 31, the filtered slurry in the filter cylinder 31 is introduced into the slurry pipe 143 and finally flows out through the slurry outlet 12, after the slurry is degassed, the electromagnetic valve 121 on the slurry outlet 12 is opened, the slurry enters the next process along the route of the filter cylinder 31, the slurry branch pipe 142, the slurry pipe 143 and the slurry outlet 12, sand removal is completed, and then a subsequent mud removal process can be directly performed, so that the use amount of equipment is reduced, and the process efficiency is improved.

In a specific embodiment, the specific technical solution of the cover 2 is as follows: as shown in fig. 6, the cover 2 is a hollow structure with an open bottom, a horizontal second partition 21 is provided inside the hollow structure, a filter 23 is provided at the bottom, the second partition 21 and the cover 2 enclose the vacuum chamber 211, the first air opening 61 of the water-air separator 6 extends between the second partition 21 and the filter 23, the second air opening 62 is communicated with the exhaust pipe 7, the exhaust pipe 7 includes a first exhaust end 71 and a second exhaust end 72, the first exhaust end 71 penetrates the cover 2 in a sealing manner to communicate with the outside, a fifth electromagnetic valve 711 is provided thereon, and the second exhaust end 72 communicates with the vacuum chamber 211, and a sixth electromagnetic valve 721 is provided thereon.

A lifting seat 24 and the vacuum pump interface 22 are arranged at the center of the top of the cover body 2; lifting seat 24 connects rotatory lifting devices, the external vacuum pump of vacuum pump interface 22 is equipped with fourth solenoid valve 221 on it, the top of lid 2 still is equipped with vacuum sensor 8 and level sensor 9, vacuum sensor 8 extends to in the vacuum cavity 211, level sensor 9 extends to in the jar body 1.

Among the above-mentioned technical scheme, filter screen 23 can block grit in the mud and moisture isolator 6 and contact, and the first gas port 61 of protection moisture isolator 6 avoids the fish tail wearing and tearing of grit, and blast pipe 7 has two exhaust ends, can select to discharge gas into the external world or discharge into vacuum chamber 211 according to actual conditions, and vacuum sensor 8 detects the vacuum in vacuum chamber 211 in real time, ensures that vacuum chamber 211 keeps the negative pressure state in the degasification process always. The liquid level sensor 9 detects the entering amount of the slurry, and ensures that the liquid level line of the slurry is positioned above the stirring device 3. The lifting seat 24 is used for connecting a rotary lifting device, the rotary lifting device is a lifting device with a horizontal rotation function, the rotary lifting device lifts the cover body 2 and then rotates in the horizontal direction, so that the cover body 2 and the tank body 1 are staggered in relative position, and the cover body 2 and the tank body 1 are convenient to overhaul.

In a specific embodiment, the specific technical scheme of the filter screen 23 is as follows: as shown in fig. 7, at least two stirring devices 3 are arranged along the length direction of the tank body 1, a fourth filtering hole 231 and a through hole 232 for the stirring device 3 to pass through are formed in the filter screen 23, two baffles 233 are arranged between every two adjacent through holes 232 at intervals, the two baffles 233 and the filter screen 23 enclose to form a stable flow area, a turning blade 234 is arranged in the fourth filtering hole 231 of the stable flow area, the turning blade 234 can turn over along with the change of mud pressure, and the water-gas isolator 6 is arranged above the stable flow area.

In the above technical solution, the number of the stirring devices 3 can be designed according to the slurry handling capacity, the larger the slurry handling capacity is, the more the number of the stirring devices 3 is, two stirring devices are selected in this embodiment, the two baffles 233 are arranged on the filter screens 23 of two adjacent stirring devices 3, and a stable flow area is formed below the water-gas isolator 6, so that the damage of the flow impact of the slurry to the water-gas isolator 6 can be effectively reduced. The turning vanes 234 are arranged in the fourth filtering holes 231 of the stable flow area, the turning vanes 234 can be arranged in the fourth filtering holes 231 of the stable flow area at intervals, and can also be arranged in all the fourth filtering holes 231 of the stable flow area, the flow rate of the slurry is further reduced through the turning of the turning vanes 234, and the water-gas isolator 6 is protected.

As shown in fig. 8, the turning vane 234 includes a fixed shaft 2341 fixed in the fourth filtering hole 231, the fixed shaft 2341 is pivotally connected to a semicircular fan blade 2342, and a torsion spring 2343 is sleeved at two ends of the fixed shaft 2341, one end of the torsion spring 2343 is fixed on the fixed shaft 2341, and the other end of the torsion spring 2343 is fixed on the fan blade 2342. This structure adopts flabellum 2342 collocation torsional spring 2343 that partly covers fourth filtration pore 231, has effectually cushioned the impact force of mud promptly, has guaranteed the flow area of mud again, and the stationary flow is effectual.

With reference to fig. 9, the present invention provides a method for using a mud circulation device, comprising the following steps:

step S100, connecting the servo motor 5, the vacuum sensor 8, the liquid level sensor 9, the first electromagnetic valve 111, the second electromagnetic valve 121, the third electromagnetic valve 131, the fourth electromagnetic valve 221, the fifth electromagnetic valve 711 and the sixth electromagnetic valve 721 to a PLC (programmable logic controller), connecting the PLC to an HMI (human machine interface), and setting a minimum vacuum degree parameter, a maximum vacuum degree parameter, a liquid level value parameter, a rotating speed parameter and a time parameter of the servo motor 5 in the HMI;

step S200, the PLC controller controls the fourth electromagnetic valve 221 to be opened, the vacuum chamber 211 is vacuumized through the vacuum pump, the vacuum chamber 211 is in a negative pressure state, and when the pressure value reaches the minimum vacuum degree parameter, the fourth electromagnetic valve 221 is closed, and vacuumizing is stopped;

step S300, the PLC controls the first electromagnetic valve 111 to be opened, the slurry is injected into the tank body 1 through the slurry inlet 11, the liquid level sensor 9 detects the liquid level value of the slurry, and when the set liquid level value parameter is reached, the first electromagnetic valve 111 is closed, and the slurry injection is stopped;

step S400, the PLC controls the servo motor 5 to start rotating, the stirring device 3 starts stirring, and the first filter holes 311 on the filter cylinder 31, the second filter holes 321 and the first sharp pointed parts 322 on the outer spiral 32, and the third filter holes 331 and the second sharp pointed parts 332 on the inner spiral 33 squeeze and pierce air bubbles in the mud;

step S500, the PLC controller controls the sixth electromagnetic valve 721 to be opened, gas in the slurry enters the vacuum cavity 211 through the water-gas isolator 6, the sixth electromagnetic valve 721 is closed after the pressure in the vacuum cavity 211 reaches the highest vacuum degree parameter, the fourth electromagnetic valve 221 is opened, the vacuum pump vacuumizes the vacuum cavity 211, the fourth electromagnetic valve 221 is closed after the lowest vacuum degree parameter is reached, the vacuumizing is stopped, the sixth electromagnetic valve 721 is opened again, and the gas in the slurry continues to enter the vacuum cavity 211 through the water-gas isolator 6;

step S600, after the set time parameter is reached, the PLC controller controls the servo motor 5 to be closed, the fifth electromagnetic valve 711 is opened, the vacuum cavity 211 is communicated with the outside through the exhaust pipe 7, and pressure is released;

step S700, the PLC controls the second electromagnetic valve 121 to be opened, slurry is pumped from the slurry outlet 12 through a slurry pump, the slurry in the tank body 1 enters the slurry pipe 143 through the filter cylinder 31 and the slurry branch pipe 142, and finally is pumped out of the tank body 1 through the slurry outlet 12 to enter the next process flow;

and step S800, the PLC controls the third electromagnetic valve 131 to be opened, and the deposited silt is discharged out of the tank body 1 through the sand discharge port 13.

Among the above-mentioned technical scheme, combine together mud circulating device and PLC controller and HMI, realize automated control, reduce workman intensity of labour, improved mud degassing desanding's standardization level and work efficiency.

The invention provides a slurry circulation process, which comprises the following steps:

step S10, primarily screening the mud by a vibrating screen, enabling the liquid phase to enter the mud circulating device, and conveying the solid phase to a drill chip drying machine by a screw conveyor;

step S20, degassing and desanding the slurry in the slurry circulating device, conveying the slurry liquid phase subjected to degassing and desanding to a first slurry tank through a slurry pump, and conveying the solid phase to a drill chip drying machine through a screw conveyor;

step S30, connecting the first mud tank with a mud remover to remove mud from mud, conveying the liquid phase of the mud after mud removal to the second mud tank through a mud pump, and conveying the solid phase to a drill chip drying machine through a screw conveyor;

step S40, connecting the second mud tank with a centrifuge to centrifugally separate mud, enabling the separated mud to enter a mud storage bin, and conveying a solid phase to a drill chip drying machine through a screw conveyor;

s50, collecting a dried solid phase by a drill cutting drying machine, and refluxing a liquid phase which is dried back to the vibrating screen;

and step S60, injecting the mud in the mud storage bin into the drilled well to establish circulation.

The mud circulation process can achieve the effects of degassing and desanding in one mud circulation device, improves the equipment utilization rate and the process efficiency, reduces the equipment use number and the occupied area of the mud circulation process, has short mud treatment flow and improves the drilling construction efficiency.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims (10)

1. The mud circulating device is characterized by comprising a tank body (1) with an opening at the top end and a cover body (2) covering the tank body (1), a mud inlet (11) is arranged above the side wall of the tank body (1), a mud outlet (12) is arranged below the side wall, a sand discharge port (13) is arranged at the bottom,

the inside vacuum cavity (211) that is equipped with of lid (2), be equipped with aqueous vapor isolator (6) in vacuum cavity (211), first gas port (61) intercommunication of aqueous vapor isolator (6) jar body (1), second gas port (62) intercommunication vacuum cavity (211), vacuum cavity (211) top is equipped with vacuum pump interface (22), lid (2) below is equipped with agitating unit (3), and the top is equipped with servo motor (5), and pivot (4) one end of vertical setting is connected the output of servo motor (5), the other end is connected agitating unit (3).

2. A mud circulation device according to claim 1, wherein said agitator means (3) comprises a filter cylinder (31), an outer screw (32) surrounding the outer side wall of said filter cylinder (31) and an inner screw (33) surrounding the inner side wall of said filter cylinder (31), said filter cylinder (31) being closed at the upper and lower ends thereof, the upper end surface being fixedly connected to said shaft (4), the lower end surface being provided with a central hole (312), the side wall being provided with a first filter hole (311).

3. A mud circulation device according to claim 2, wherein the outer spiral (32) and the inner spiral (33) have opposite spiral directions, the outer spiral (32) is provided with second filtering holes (321) and first spine portions (322), and the inner spiral (33) is provided with third filtering holes (331) and second spine portions (332).

4. A mud circulation device according to claim 3, wherein a first partition plate (14) is arranged in the tank body (1), a sand settling hole (141) and a mud branch pipe (142) vertically penetrating through the first partition plate (14) are arranged on the first partition plate (14), one end of the mud branch pipe (142) is inserted into the central hole (312) of the filter cylinder (31), the other end of the mud branch pipe is communicated with a horizontally arranged mud pipe (143), the mud pipe (143) is communicated with the mud outlet (12), a second electromagnetic valve (121) is arranged on the mud outlet (12), and a third electromagnetic valve (131) is arranged on the sand outlet (13).

5. A mud circulation device according to claim 4, wherein the cover (2) is a hollow structure with an open bottom, a horizontal second partition (21) is arranged in the cover, a filter screen (23) is arranged at the bottom, the second clapboard (21) and the cover body (2) enclose to form the vacuum cavity (211), a first air port (61) of the water-gas isolator (6) extends between the second clapboard (21) and the filter screen (23), a second air port (62) is communicated with the exhaust pipe (7), the exhaust pipe (7) comprises a first exhaust end (71) and a second exhaust end (72), the first exhaust end (71) penetrates through the cover body (2) in a sealing way to be communicated with the outside, a fifth electromagnetic valve (711) is arranged on the vacuum chamber (211), the second exhaust end (72) is communicated with the vacuum chamber, and a sixth electromagnetic valve (721) is arranged on the vacuum chamber.

6. A mud circulation device according to claim 5, wherein the cover body (2) is provided with a lifting seat (24) and the vacuum pump interface (22) at the top center; rotatory lifting devices is connected in lift seat (24), the external vacuum pump of vacuum pump interface (22) is equipped with fourth solenoid valve (221) on it, the top of lid (2) still is equipped with vacuum sensor (8) and level sensor (9), vacuum sensor (8) extend to in vacuum cavity (211), level sensor (9) extend to in the jar body (1).

7. The mud circulation device as claimed in claim 6, wherein there are at least two stirring devices (3) along the length direction of the tank (1), the filter screen (23) is provided with a fourth filtering hole (231) and a through hole (232) for the stirring device (3) to rotate through, two baffles (233) are arranged between two adjacent through holes (232) at intervals, the two baffles (233) and the filter screen (23) enclose a stable flow area, a turning blade (234) is arranged in the fourth filtering hole (231) of the stable flow area, the turning blade (234) can turn over along with the change of mud pressure, and the water-gas isolator (6) is arranged above the stable flow area.

8. The mud circulation device as claimed in claim 7, wherein the turning vane (234) comprises a fixing shaft (2341) fixed in the fourth filtering hole (231), the fixing shaft (2341) is pivotally connected to a semicircular vane (2342), and a torsion spring (2343) is sleeved at two ends of the fixing shaft (2341), and one end of the torsion spring is fixed on the fixing shaft (2341) and the other end of the torsion spring is fixed on the vane (2342).

9. A method of using a mud circulation device, using the mud circulation device of claim 8, comprising the steps of:

step S100, connecting a servo motor (5), a vacuum sensor (8), a liquid level sensor (9), a first electromagnetic valve (111), a second electromagnetic valve (121), a third electromagnetic valve (131), a fourth electromagnetic valve (221), a fifth electromagnetic valve (711) and a sixth electromagnetic valve (721) to a PLC (programmable logic controller), connecting the PLC to an HMI, and setting a minimum vacuum degree parameter, a maximum vacuum degree parameter, a liquid level value parameter, a rotating speed parameter and a time parameter of the servo motor (5) in the HMI;

step S200, the PLC controller controls the fourth electromagnetic valve (221) to be opened, the vacuum chamber (211) is vacuumized through the vacuum pump, the vacuum chamber (211) is in a negative pressure state, and when the pressure value reaches the minimum vacuum degree parameter, the fourth electromagnetic valve (221) is closed, and vacuumizing is stopped;

s300, the PLC controls a first electromagnetic valve (111) to be opened, slurry is injected into the tank body (1) through a slurry inlet (11), a liquid level sensor (9) detects the liquid level value of the slurry, and when the set liquid level value parameter is reached, the first electromagnetic valve (111) is closed and the slurry injection is stopped;

s400, the PLC controls a servo motor (5) to start rotating, a stirring device (3) starts stirring, a first filter hole (311) on a filter cylinder (31), a second filter hole (321) and a first sharp-pointed part (322) on an outer spiral (32), a third filter hole (331) and a second sharp-pointed part (332) on an inner spiral (33) extrude and pierce bubbles in slurry;

step S500, the PLC controller controls a sixth electromagnetic valve (721) to be opened, gas in the slurry enters a vacuum cavity (211) through a water-gas isolator (6), the sixth electromagnetic valve (721) is closed after the pressure in the vacuum cavity (211) reaches a maximum vacuum degree parameter, a fourth electromagnetic valve (221) is opened, a vacuum pump vacuumizes the vacuum cavity (211), the fourth electromagnetic valve (221) is closed after the pressure reaches a minimum vacuum degree parameter, vacuumizing is stopped, the sixth electromagnetic valve (721) is opened again, and the gas in the slurry continues to enter the vacuum cavity (211) through the water-gas isolator (6);

step S600, after the set time parameter is reached, the PLC controller controls the servo motor (5) to be closed, the fifth electromagnetic valve (711) is opened, the vacuum cavity (211) is communicated with the outside through the exhaust pipe (7), and pressure is released;

s700, the PLC controls a second electromagnetic valve (121) to be opened, slurry is pumped from a slurry outlet (12) through a slurry pump, the slurry in the tank body (1) enters a slurry pipe (143) through a slurry branch pipe (142) through a filter cylinder (31), and finally is pumped out of the tank body (1) through the slurry outlet (12) to enter the next process flow;

and S800, the PLC controls the third electromagnetic valve (131) to be opened, and the deposited silt is discharged out of the tank body (1) through the sand discharge port (13).

10. A slurry circulation process is characterized by comprising the following steps:

step S10, after primary screening of the mud by a vibrating screen, enabling a liquid phase to enter a mud circulation device as claimed in claim 8, and conveying a solid phase to a drill cuttings drying machine through a screw conveyor;

step S20, degassing and desanding the slurry in the slurry circulating device, conveying the slurry liquid phase subjected to degassing and desanding to a first slurry tank through a slurry pump, and conveying the solid phase to a drill chip drying machine through a screw conveyor;

step S30, connecting the first mud tank with a mud remover to remove mud from mud, conveying the liquid phase of the mud after mud removal to the second mud tank through a mud pump, and conveying the solid phase to a drill chip drying machine through a screw conveyor;

step S40, connecting the second mud tank with a centrifuge to centrifugally separate mud, enabling the separated mud to enter a mud storage bin, and conveying a solid phase to a drill chip drying machine through a screw conveyor;

s50, collecting a dried solid phase by a drill cutting drying machine, and refluxing a liquid phase which is dried back to the vibrating screen;

and step S60, injecting the mud in the mud storage bin into the drilled well to establish circulation.

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