CN111577175A - Solid-liquid separation device and method for drilling cuttings in underground coal mine - Google Patents

Abstract

The invention provides a solid-liquid separation device and a solid-liquid separation method for drilling cuttings in a coal mine, wherein the device comprises a primary filtering system, a vibration cyclone solid-liquid separation system, a liquid level intelligent control system and a secondary liquid phase collecting system, wherein the primary filtering system is used for carrying out primary filtering on drilling cuttings and comprises a filtering screen, a slurry pump, a primary liquid phase collecting box, a large particle solid phase collecting box and a liquid level intelligent controller; the vibration cyclone solid-liquid separation system performs three-stage solid-liquid separation treatment on drill cuttings and comprises a vibration sieve, a cyclone desander, a cyclone deslimer, a slurry pump, a liquid phase collection box, a small particle solid phase collection box and a liquid level intelligent controller; the liquid level intelligent control system realizes the automatic control of the liquid levels of each liquid phase collecting box in the primary filtering system and the vibration cyclone solid-liquid separation system and comprises three liquid level intelligent controllers; and the secondary liquid phase collecting system is used for collecting the liquid phase cleaned after solid-liquid separation. The invention has three functions of large circulation, small circulation and automatic flushing circulation, realizes the separation of solid-liquid phases of drilling cuttings in underground coal mine drilling construction, and continuously recycles the separated liquid phase.

Description

A device and method for solid-liquid separation of drilling cuttings in underground coal mines

technical field

The invention relates to the technical field of underground drilling in coal mines, in particular to a device and method for solid-liquid separation of drilling cuttings in underground coal mines.

Background technique

Drilling technology is widely used in coal mines, mainly in the construction of boreholes such as gas control, water hazard prevention, and geological structure detection. The underground drilling technologies in coal mines mainly include ordinary rotary drilling technology and near-horizontal directional drilling technology.

The ordinary rotary drilling technology uses the power head of the drilling rig to provide power, and drives the drill bit to rotate to break the rock through the rotation of the drill string. During the drilling process, clean water is mainly used as the flushing medium, and the drilling cuttings produced by the drilling construction are accompanied by drilling slag and water. The mixture is often subjected to simple natural precipitation treatment to achieve extensive solid-liquid separation of drill cuttings. The separated liquid phase cannot be recycled, resulting in serious waste of water resources.

The near-horizontal directional drilling technology in underground coal mines uses the bottom-hole motor as the power at the bottom of the hole, and pressurizes the water through the mud pump to form high-pressure water to drive the rotor of the bottom-hole motor to rotate, and the motor rotor drives the drill bit to rotate to break the rock. During the drilling process, a measurement-while-drilling system is equipped, which can measure the parameters of the drilling trajectory in real time, and display the actual drilling trajectory and the designed trajectory of the drilling hole, so as to realize the artificial control of the drilling trajectory.

In recent years, with the continuous development of directional drilling technology and equipment in coal mines, directional drilling technology and equipment have developed in the direction of high power, large diameter and ultra-deep holes. The water consumption per unit time is as high as 24m ³ /h. Since the bottom hole motor has strict requirements on the solid content in the water, clean water is used as the flushing medium in the directional drilling construction. The drilling cuttings produced by the drilling construction cannot be effectively separated from the solid and liquid at present, and the recycling of the drilling water cannot be realized. The waste of resources is very serious.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a solid-liquid separation device and method for drilling cuttings in underground coal mines. The invention realizes the effective separation of solid-liquid of drilling cuttings in underground drilling construction in coal mines, and realizes the recycling of liquid phase, thereby significantly reducing the The water consumption of drilling construction achieves the purpose of saving water resources, and at the same time, it realizes the centralized shipment and treatment of solid phase.

In order to solve the above problems, the present invention discloses a solid-liquid separation device and method for drilling cuttings in underground coal mines.

A solid-liquid separation device for drilling cuttings in a coal mine, comprising a primary filtration system, a vibrating cyclone solid-liquid separation system, an intelligent liquid level control system and a secondary liquid phase collection system;

The primary filtration system is used for primary filtration of drill cuttings with large particles;

The vibrating cyclone solid-liquid separation system performs multi-stage separation treatment on the drill cuttings generated by the primary filtration system through vibration and cyclone respectively;

The intelligent liquid level control system is used for the automatic control of the liquid level of each liquid phase collection tank in the primary filtration system and the vibrating cyclone solid-liquid separation system, to ensure the dynamic balance of the solid-liquid filtration and separation capabilities of drilling cuttings in each system, and to prevent the liquid level from overshooting. Low damage to the slurry pump;

The secondary liquid phase collection system collects the liquid phase generated by the vibrating cyclone solid-liquid separation system and then recycles it.

Specifically, the primary filtration system includes a filter screen, a slurry pump and a primary liquid phase collection box. After the drill cuttings first pass through the filter screen to the primary liquid phase collection box, they are sucked into the vibrating cyclone solid-liquid separation system by the slurry pump. , to achieve primary filtration of large particle cuttings.

More specifically, the primary filtration system further includes a large particle solid phase collection box and a liquid level intelligent controller, and the large particle solid phase collection box is used to collect large particle drill cuttings generated by filtration through the filter screen; the liquid level intelligent control The controller is used to control the liquid level of the primary liquid phase collection tank.

Meanwhile, the vibrating cyclone solid-liquid separation system includes a vibrating screen, a cyclone desander, a cyclone desilter, a first slurry pump, a second slurry pump, a first liquid phase collection tank, and a second liquid phase collection tank. The collection tank and the third liquid phase collection tank, the first liquid phase collection tank, the second liquid phase collection tank and the third liquid phase collection tank are connected at a low level to realize the synchronous change of liquid level, and the vibrating screen is located on the upper part of the first liquid phase collection tank; The upper part of the first liquid phase collection box is provided with a cyclone desander and a cyclone desilter; a first slurry pump and a second slag pump are respectively arranged on the second liquid phase collection box and the third liquid phase collection box slurry pump;

The liquid phase generated by the primary filtration system is firstly filtered by the vibrating screen, and the generated liquid phase enters the first liquid phase collection box, the second liquid phase collection box and the third liquid phase collection box; the second liquid phase collection box The liquid phase is sucked into the cyclone desander by the first slurry pump for cyclone desander, and the generated liquid phase enters the third liquid phase collection tank; the liquid phase in the third liquid phase collection tank is sucked by the second slurry pump The cyclone desilter performs cyclone desilting, and the generated liquid phase enters the secondary liquid phase collection system; the solid phase generated by the above-mentioned tertiary solid-liquid separation treatment enters the small particle solid phase collection box to realize centralized shipment and cleaning.

Specifically, the first liquid phase collection box is provided with a sloping bottom sand settling bin to realize concentrated precipitation of sediment in the liquid phase; the vibrating screen is provided with a screw lifting device, which facilitates the adjustment of the installation angle of the vibrating screen.

More specifically, the first liquid phase collection box is provided with a small particle solid phase collection box; the second liquid phase collection box and the third liquid phase collection box are both provided with liquid level controllers.

More specifically, the primary liquid phase collection tank, the second liquid phase collection tank and the third liquid phase collection tank are all provided with bottom flushing and cleaning pipelines, which can perform automatic flushing cycles to realize the bottom sediment in the above-mentioned liquid phase collection tanks. The automatic cleaning process reduces labor intensity.

The present invention also provides a method for solid-liquid separation of drilling cuttings in underground coal mines. According to any one of the above claims, the processing paths of the drilling cuttings included in the method include the following two:

One is that the drill cuttings pass through the primary filtration system and the vibrating cyclone solid-liquid separation system in turn, and the liquid phase generated after the multi-stage solid-liquid separation treatment enters the secondary liquid phase collection system for recycling;

The other is that drilling cuttings can be filtered in multiple stages of repeated circulation in the vibrating cyclone solid-liquid separation system, which is used to realize the cyclic filtration of the liquid phase generated by the primary filtration system, and the final liquid phase generated enters the secondary liquid phase collection system. Implement recycling.

The above two processing paths can exist in the system at the same time, or can exist independently.

The beneficial effects of the present invention are:

1) Using filter screen, vibrating screen, cyclone desander and cyclone desilter to classify the solid phase in drilling cuttings according to the particle size, the solid-liquid separation and purification effect is good, and the treated liquid phase satisfies Drilling requirements, can be recycled;

2) It has three functions of large cycle, small cycle and automatic flushing cycle to meet the needs of drilling construction and reduce labor intensity;

3) The liquid level intelligent control system is used to realize the automatic control of the liquid level in each liquid phase collection box;

4) The solid phase collection box is used to realize the centralized shipment and processing of the solid phase in the drill cuttings.

The details of the present invention can be obtained from the description to be described later and the accompanying drawings.

Description of drawings:

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structure schematic diagram of the primary filter box of the present invention;

3 is a schematic structural diagram of a vibrating cyclone solid-liquid separation system of the present invention;

FIG. 4 is a schematic structural diagram of the secondary liquid phase collecting box of the present invention.

Reference number:

1-primary filtration system; 2-vibration cyclone solid-liquid separation system; 3-liquid level intelligent control system; 4-secondary liquid phase collection system; 5-mud pump; 6-orifice device; 1-1-filter screen Net; 1-2-slurry pump; 1-3- primary liquid phase collection box; 1-4- large particle solid phase collection box; 1-5- liquid level intelligent controller; 2-1- vibrating screen; 2- 2-cyclone desander; 2-3-cyclone desilter; 2-4-first slurry pump; 2-5-second slurry pump; 2-6-first liquid phase collection tank; 2 -7- The second liquid phase collection tank; 2-8- The third liquid phase collection tank; Solid phase collection box; 2-13-screw lifting device; 4-1-secondary liquid phase collection box.

Detailed ways:

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The large particles and small particles described in the present invention have no absolute particle size, but the particle size of the drill cuttings is relatively small, and the preliminary separation is achieved through a screen with a certain aperture. In specific practice, the screen aperture can be adjusted. .

Example 1:

1, the device and method for solid-liquid separation of drilling cuttings in underground coal mines according to the present invention, wherein the device includes a primary filtration system 1, a vibration cyclone solid-liquid separation system 2, a liquid level intelligent control system 3 and a secondary liquid phase Collection System 4.

Referring to FIG. 2 , the primary filtration system 1 includes a filter screen 1-1, a slurry pump 1-2, a primary liquid phase collection tank 1-3, a large particle solid phase collection tank 1-4 and an intelligent liquid level controller 1 -5.

3, the vibrating cyclone solid-liquid separation system 2 includes a vibrating screen 2-1, a cyclone desander 2-2, a cyclone desander 2-3, a slurry pump 2-4 and 2-5, Liquid phase collection boxes 2-6, 2-7 and 2-8, small particle solid phase collection boxes 2-12 and liquid level controllers 2-10 and 2-11.

The liquid level intelligent control system 3 includes liquid level intelligent controllers 1-5, liquid level controllers 2-10 and 2-11.

The vibrating cyclone solid-liquid separation system 2 includes three liquid phase collection boxes, which are a first liquid phase collection box 2-6, a second liquid phase collection box 2-7 and a third liquid phase collection box 2-8, respectively. The low-level communication is carried out through the connecting pipeline to realize the synchronous change of the liquid level of the three liquid-phase collecting tanks.

The first liquid phase collection box 2-6 is provided with a sloping bottom sand settling bin 2-9 to realize the concentrated precipitation of the sediment in the liquid phase.

The vibrating screen 2-1, the cyclone desander 2-2 and the cyclone desilter 2-3 are installed on the primary liquid phase collection tank 2-6.

The vibrating screen 2-1 is provided with a screw lifting device 2-13, which facilitates the adjustment of the installation angle of the vibrating screen 2-1.

The vibrating cyclone solid-liquid separation system 2 includes two slurry pumps, which are respectively a slurry pump 2-4 and a slurry pump 2-5; the slurry pump 2-4 is installed in the second liquid phase collecting box 2-7 Above, the slurry pump 2-5 is installed on the third liquid phase collecting tank 2-8.

The intelligent liquid level controllers 1-5, 2-10 and 2-11 included in the intelligent liquid level control system 3 are respectively installed in the primary liquid phase collection tank 1-3, the second liquid phase collection tank 2-7 and the third liquid phase collection tank 2-7. On the liquid phase collection boxes 2-8, the automatic control of the liquid level in the above-mentioned liquid phase collection boxes is realized. When the liquid level in each liquid phase collection box is higher or lower than the set liquid level, the power is automatically cut off to realize automatic safety protection. , to prevent the slurry pump from being damaged due to low liquid level.

The primary liquid phase collection box 1-3, the second liquid phase collection box 2-7 and the third liquid phase collection box 2-8 are provided with bottom flushing and cleaning pipelines, which can perform automatic flushing cycle to realize the above-mentioned liquid phase collection box Automatic flushing and cleaning of internal sediments, reducing labor intensity.

The primary filtration system 1 and the vibrating cyclone solid-liquid separation system 2 are provided with large-particle solid-phase collection boxes 1-4 and small-particle solid-phase collection boxes 2-12, so as to realize the solid-phase centralized shipment processing after solid-liquid separation of drill cuttings.

Example 2:

The present implementation provides a method for solid-liquid separation of drilling cuttings in underground coal mines, which realizes a large circulation of the liquid phase of drilling cuttings through the following steps:

a. Drilling construction preparation, including filling the liquid phase collection boxes 1-3, 2-6, 2-7 and 2-8 and the secondary liquid phase collection box 4-1 of the device with clean water, connecting the drilling tools combination, etc.;

b. Start the slurry pump 2-4 and the slurry pump 2-5;

c. Start the mud pump 5, and pump the clean water in the secondary liquid phase collecting tank 4-1 into the hole through the orifice device 6;

d. Start the drilling rig and carry out drilling construction;

e. When the drilling cuttings are returned from the orifice device 6, start the slurry pump 1-2 on the primary liquid phase collecting box 1-3, filter out the solid phase of the large-particle drilling cuttings through the filter screen 1-1, and enter the Large particle solid phase collector 1-4, the remaining liquid phase with small particles is pumped into vibrating cyclone solid-liquid separation system 2 by slurry pump 1-2, and passes through vibrating screen 2-1 and cyclone desander 2- 2 and cyclone desilter 2-3 three-stage solid-liquid separation treatment, the separated solid phase enters the small particle solid phase collector 2-12, the separated liquid phase enters the secondary liquid phase collection box 4-1, and then the mud The pump 5 is pumped into the hole, thus realizing the reciprocating circulation of the liquid phase during drilling construction.

The large circulation is that after the drilling cuttings are filtered by screen, vibrating, cyclone sand removal and cyclone desilting, the separated liquid phase is used again for drilling construction, and the liquid flow path of drilling cuttings is as follows: Port return → filter screen 1-1 on primary liquid phase collection box 1-3 → primary liquid phase collection box 1-3 → slurry pump 1-2 on primary liquid phase collection box 1-3 → vibrating swirl flow Vibrating screen 2-1 on solid-liquid separation system 2 → first liquid phase collection box 2-6 → second liquid phase collection box 2-7 → slurry pump 2-4 → cyclone desander 2-2 → first Three-phase liquid collection tank 2-8→slurry pump 2-5→cyclone desilter 2-3→secondary liquid phase collection tank 4-1→mud pump 5→hole→return drilling fluid from orifice.

A device and method for solid-liquid separation of drilling cuttings in underground coal mines, which realizes the small circulation of the liquid phase of drilling cuttings through the following steps:

a. Turn off the drilling mud pump 5 and stop water injection into the hole;

b. Turn off the slurry pump 1-2 on the primary liquid phase collection box 1-3;

c. Start the slurry pump 2-4 and the slurry pump 2-5, and the liquid phases in the first, second and third liquid phase collection boxes 2-6, 2-7 and 2-8 are repeatedly circulated into the vibrating screen 2 -1. The cyclone desander 2-2 and the cyclone desilter 2-3 are subjected to three-stage repeated cycle solid-liquid separation treatment, and the generated solid phase is concentrated into the small particle solid phase collector 2-12. Thereby, small-cycle repeated solid-liquid separation and purification of the liquid phases in the first, second and third liquid phase collection boxes 2-6, 2-7 and 2-8 is realized, and the separation and purification effect is improved.

The small circulation, that is, drilling cuttings, is subjected to repeated circulation and separation processing in the first, second and third liquid phase collection boxes 2-6, 2-7 and 2-8, and the liquid flow path of the drilling cuttings is: the second Liquid phase collection box 2-7→slurry pump 2-4→cyclone desander 2-2→third liquid phase collection box 2-8→slurry pump 2-5→cyclone desilter 2-3→ The first liquid phase collection box 2-6→the second liquid phase collection box 2-7.

As another function, the primary liquid phase collection box 1-3 included in the primary filtration system 1, the second liquid phase collection box 2-7 included in the vibrating cyclone solid-liquid separation system 2, and the third liquid phase collection box are realized through the following steps Automatic flushing cycle of sediment in boxes 2-8:

a. Turn off the drilling mud pump 5 and stop water injection into the hole;

b. Start the upper slurry pump 1-2 of the primary liquid phase collection box 1-3, the upper slurry pump 2-4 of the second liquid phase collection box 2-7 and the upper slurry pump 2 of the third liquid phase collection box 2-8 -5, the liquid phases in the primary liquid phase collection tank 1-2, the second liquid phase collection tank 2-7 and the third liquid phase collection tank 2-8 on the primary filtration system 1 are circulated independently, respectively, flushing and depositing in the above-mentioned The sediment at the bottom of the liquid phase collection box realizes the automatic cleaning of the sediment in the above-mentioned liquid phase collection boxes.

The small cycle of the present invention has the function of repeating the solid-liquid separation of the liquid phases in the first, second and third liquid phase collecting boxes, so as to realize the repeated solid-liquid separation in the first, second and third liquid phase collecting boxes, Significantly improve the solid-liquid separation effect.

The large circulation of the present invention has the function of solid-liquid separation of drilling cuttings, realizes solid-liquid separation of drilling cuttings, the separated liquid phase continues to be recycled, and the separated solid phase is centrally shipped and processed.

At the same time, it has an automatic flushing cycle function to flush and clean the sediment in the primary liquid phase collection tank, the second liquid phase collection tank and the third liquid phase collection tank, so as to realize the automatic cleaning of the sediment in the above-mentioned liquid phase collection tanks and reduce the number of workers. Labor intensity.

The above three cycles can work individually or simultaneously.

It will be apparent that the above descriptions and records are merely examples and are not intended to limit the disclosure, application, or uses of the present invention. While the embodiments have been described and described in the accompanying drawings, this invention is not limited to the specific examples illustrated by the drawings and described in the embodiments as the best mode presently believed to be for carrying out the teachings of this invention. , the scope of the invention shall include any embodiments falling within the preceding description and appended claims.

Claims (8)

1. A device for solid-liquid separation of drilling cuttings in underground coal mines, characterized in that it comprises a primary filtration system (1), a vibrating cyclone solid-liquid separation system (2), a liquid level intelligent control system (3) and a secondary liquid a phase collection system (4); The primary filtration system (1) is used for primary filtration of drill cuttings with large particles; The vibrating cyclone solid-liquid separation system (2) performs multi-stage separation processing on the drill cuttings generated by the primary filtration system (1) through vibration and cyclone respectively; The liquid level intelligent control system (3) is used for automatic control of the liquid level of each liquid phase collecting tank in the primary filtration system (1) and the vibrating cyclone solid-liquid separation system (2); The secondary liquid phase collection system (4) collects the liquid phase generated by the vibrating cyclone solid-liquid separation system (2) and then recycles it. 2. The device for solid-liquid separation of drilling cuttings in underground coal mines according to claim 1, wherein the primary filter system (1) comprises a filter screen (1-1), a slurry pump (1-2) ) and the primary liquid phase collection box (1-3), the drill cuttings first pass through the filter screen (1-1) to the primary liquid phase collection box (1-3), and are sucked into the vibrating rotor by the slurry pump (1-2). The fluid-solid-liquid separation system (2) realizes primary filtration of large-particle drill cuttings. 3. The solid-liquid separation device for drilling cuttings in underground coal mines according to claim 2, wherein the primary filter system (1) further comprises a large-particle solid-phase collection box (1-4) and a liquid level intelligent A controller (1-5), a large-particle solid-phase collection box (1-4) is used to collect the large-particle drill cuttings produced by the filtering screen (1-1); the intelligent liquid level controller (1-5) It is used to control the liquid level of the primary liquid phase collection box (1-3) to ensure the dynamic balance of the solid-liquid filtration and separation capabilities of drilling cuttings in each system. 4. The solid-liquid separation device for drilling cuttings in underground coal mines according to claim 1, wherein the vibrating cyclone solid-liquid separation system comprises a vibrating screen (2-1), a cyclone desander (2) -2), cyclone desilter (2-3), first slurry pump (2-4), second slurry pump (2-5), first liquid phase collection box (2-6), The second liquid phase collection tank (2-7) and the third liquid phase collection tank (2-8), the first liquid phase collection tank (2-6), the second liquid phase collection tank (2-7) and the third liquid phase collection tank (2-7) The phase collection box (2-8) is connected at a low level to realize the synchronous change of liquid level, and the vibrating screen (2-1) is located at the upper part of the first liquid phase collection box (2-6); the upper part of the first liquid phase collection box (2-6) At the same time, a cyclone desander (2-2) and a cyclone desilter (2-3) are provided; in the second liquid phase collection box (2-7) and the third liquid phase collection box (2-8) ) are respectively provided with a first slurry pump (2-4) and a second slurry pump (2-5); The liquid phase generated by the primary filtration system (1) is firstly filtered by the vibrating screen (2-1), and the generated liquid phase enters the first liquid phase collection box (2-6) and the second liquid phase collection box (2). -7) and the third liquid phase collection box (2-8); the liquid phase in the second liquid phase collection box (2-7) is sucked into the cyclone desander (2) by the first slurry pump (2-4) -2) cyclone desanding is carried out, and the generated liquid phase enters the third liquid phase collecting tank (2-8); the liquid phase in the third liquid phase collecting tank (2-8) is supplied by the second slurry pump (2-8). 5) Suction cyclone desilter (2-3) to carry out cyclone desilting, and the generated liquid phase enters the secondary liquid phase collection system (4) and is recycled; Small particle solid phase collection box (2-12), realizes centralized shipping and cleaning. 5. The solid-liquid separation device for drilling cuttings in underground coal mines according to claim 4, wherein the first liquid phase collection box (2-6) is provided with an inclined bottom sand settling bin (2-9), The concentrated precipitation of the sediment in the liquid phase is realized; the vibrating screen (2-1) is provided with a screw lifting device (2-13), which facilitates the adjustment of the installation angle of the vibrating screen (2-1). 6. The solid-liquid separation device for drilling cuttings in underground coal mines according to claim 4 or 5, wherein the first liquid phase collection box (2-6) is provided with a small particle solid phase collection box (2-6). 12); liquid level controllers (2-10 and 2-11) are provided in the second liquid phase collection box (2-7) and the third liquid phase collection box (2-8). 7. The solid-liquid separation device for drilling cuttings in underground coal mines according to claim 4 or 5, characterized in that the primary liquid phase collection box (1-3), the second liquid phase collection box (2-7) ) and the third liquid phase collection box (2-8) are provided with bottom flushing and cleaning pipelines, which can perform automatic flushing cycle, realize the automatic cleaning treatment of the bottom sediment in the above-mentioned liquid phase collection box, and reduce labor intensity. 8. A method for solid-liquid separation of drilling cuttings in underground coal mines, according to any one of the preceding claims, the processing paths of the drilling cuttings included in the method include the following two: The drill cuttings pass through the primary filtration system (1) and the vibrating cyclone solid-liquid separation system (2) in turn, and the liquid phase generated after the multi-stage solid-liquid separation treatment enters the secondary liquid phase collection system (4) to realize large-scale recycling; The drilling cuttings can be filtered in multiple stages of repeated circulation in the vibrating cyclone solid-liquid separation system (2), which is used to realize the cyclic filtration of the liquid phase generated by the primary filtration system, and the finally generated liquid phase enters the secondary liquid phase collection system ( 4) Realize small circular use.

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