A hole cleaning device and a near-horizontal drilling flushing fluid hole cleaning system

Abstract

The present invention discloses an orifice purification device and a near-horizontal drilling flushing liquid orifice purification system, the system includes an orifice device, an orifice purification device and a flocculation and dosing device, wherein the orifice purification device is provided with: a flocculation and filtration assembly, the flocculation and filtration assembly is provided with at least a shell, a first drum and a second drum are sleeved in the shell at intervals; a stirring and filtration assembly is provided axially interlaced between the first drum and the second drum; the drilling flushing liquid is passed into the first drum from the end and then subjected to preliminary centrifugal filtration, and then stirred and flocculated by the stirring and filtration assembly in the shell, and the flocculated liquid enters the second drum from the end and is subjected to secondary centrifugal filtration before being discharged. The device and system provided by the present invention can remove 10 ‑3 Solid particles smaller than μm can be removed, and the purified flushing fluid can be reused without causing damage to the mud pump and screw motor, greatly reducing the water consumption in drilling construction.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling equipment and relates to a hole cleaning device and a near-horizontal drilling flushing fluid hole cleaning system. Background Art

[0002] At present, the construction volume of underground gas extraction and water exploration and drainage drilling in coal mines is huge. Currently, most of the construction uses clean water as drilling fluid. After it returns from the bottom of the hole, it is directly discharged after simple sedimentation and cannot be recycled, resulting in a surge in water consumption and causing huge pressure on coal mine production water.

[0003] The above problems have been solved in oil drilling construction through solids control systems. However, the solids control equipment used in the oil field is too large, the centrifuge speed is high, and the electrical explosion-proof level does not meet the coal safety certification requirements, making it impossible to use in coal mines.

[0004] Patent CN111577175A discloses a solid-liquid separation device and method for underground coal mine drilling cuttings. The device utilizes a three-stage separation system: a vibrating screen, a cyclone desander, and a cyclone desilter. The vibrating screen first removes large drill cuttings, typically particles larger than 120 mesh (equivalent to 125 μm). A cyclone desander typically separates particles between 40 and 100 μm, while a cyclone desilter typically separates particles between 15 and 44 μm. The desanding efficiency is approximately 90%. The treated flushing fluid can be used for conventional rotary drilling but not for directional drilling, where it drives the bottomhole drill tool (bottomhole motor). Residual cuttings can damage the motor, shortening its lifespan. Screw motors are expensive, increasing construction costs. Furthermore, the device is bulky and inconvenient to place in the confined space underground. Summary of the Invention

[0005] The purpose of the present invention is to provide a hole cleaning device and a near-horizontal drilling flushing fluid hole cleaning system, which can be used for near-horizontal conventional (rotary) drilling and directional drilling in coal mines, and can remove 10 -3 Solid particles below μm can be removed, and the purified flushing fluid can be reused without causing damage to the mud pump and screw motor, greatly reducing the water consumption in drilling construction.

[0006] The technical solution of the present invention is:

[0007] An orifice purification device, comprising:

[0008] The flocculation and filtration assembly is provided with at least a shell, in which a first drum and a second drum are spaced apart; and a stirring and filtration assembly is provided axially interlaced with the first drum and the second drum;

[0009] The drilling flushing fluid is passed into the first drum from the end for preliminary centrifugal filtration, and then stirred and flocculated by the stirring and filtering assembly in the shell. The flocculated liquid enters the second drum from the end for secondary centrifugal filtration and is then discharged.

[0010] Optionally, the stirring and filtering assembly completely seals one co-directional axial end of the first drum and the second drum, and partially seals the other co-directional axial end.

[0011] Optionally, the partial closure includes:

[0012] The end of the first drum is a semi-closed structure, and the end of the second drum is a hole structure.

[0013] Optionally, the stirring and filtering assembly is provided with an axial tube, and a first baffle, a second baffle, a stirring paddle, a third baffle and a fourth baffle are arranged at intervals on the axial tube; the first baffle is a semicircular plate, the second baffle and the fourth baffle are circular plates, and the third baffle is a perforated plate.

[0014] Optionally, the first drum is a cylindrical structure with holes, the diameter of the holes is α, and the value of α is determined by the particle size distribution characteristics of the returned rock cuttings, and the critical diameter of the rock cuttings particles with a cumulative mass fraction of 50% is taken;

[0015] The second drum is a cylindrical structure with holes. The diameter of the holes is β. The value of β is determined through flocculation test and is smaller than the diameter of the flocs.

[0016] Optionally, a plurality of sprinkler heads are embedded in the housing;

[0017] A cover plate is provided below the shell, and a water outlet pipe is provided on the shell below the second drum.

[0018] Optionally, a power assembly is provided outside the shell, and the power assembly includes a motor base, a motor is provided on the motor base, the motor has a driving wheel and a belt, the end of the second drum is a driven wheel, and the belt connects the driven wheel and the driving wheel.

[0019] A near-horizontal drilling flushing fluid orifice purification system is provided, wherein an orifice purification device is provided, a water inlet end of the orifice purification device is connected to the orifice device, and a flocculation dosing device is provided on the housing of the orifice purification device;

[0020] The orifice purification device is any orifice purification device described in the present invention.

[0021] Optionally, the flocculation and dosing device is provided with a stirring box and a medicine storage box in parallel; the stirring box is connected to a water inlet solenoid valve and a first metering pump, and a stirrer is provided inside; a spiral feeder is provided on the medicine storage box, and is connected to a second metering pump.

[0022] Optionally, the orifice device is sequentially connected to a rotary blowout preventer, a tee and a flange reducer.

[0023] The beneficial effects of the present invention are:

[0024] The two-stage centrifugal dehydration principle is used, combined with flocculation reaction, the purification effect is good, and the flocculation reaction can adsorb 10 -3 The device can produce fine particles of 0.1 μm; the device has a compact structure and small size, making it easy to use in the narrow space of coal mines; it adopts an automated control solution, and the equipment runs synchronously when the mud pump is turned on, without the need for dedicated management; if it is promoted and used on a large scale, it can greatly reduce the water used in coal mine drilling, with significant social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a composition diagram of the near-horizontal drilling flushing fluid orifice purification system provided by the present invention;

[0027] Figure 2 It is a structural schematic diagram of the orifice purification device provided by the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the flocculation and filtration assembly of the orifice purification device provided by the present invention;

[0029] Figure 4 yes Figure 3 Rear view;

[0030] Figure 5 This is a schematic diagram of the structure of the stirring and filtering assembly of the orifice purification device provided by the present invention;

[0031] Figure 6 Schematic diagram of the structure of the orifice device provided by the present invention;

[0032] Figure 7 This is a schematic structural diagram of the flocculation and dosing device provided by the present invention;

[0033] Explanation of numbers and symbols in the figure:

[0034] 1-orifice purification device, 11-flocculation filter assembly, 111-housing, 1111-cover plate, 1112-sprinkler head, 1113-water outlet pipe, 112-flange end plate, 113-first drum, 114-first annular baffle, 115-second annular baffle, 116-second drum, 117-annular end plate, 118-power assembly, 1181-motor, 1182-driving wheel, 1183-motor seat, 1184-belt, 1185-driven wheel, 12-agitation filter assembly, 121-tube shaft, 122-first baffle, 1221-first limiting protrusion, 123-second baffle, 124-agitation paddle, 125-third baffle, 1251-second limiting protrusion, 126-fourth baffle, 127-clamp fixing plate, 128-hydraulic clamp, 13-bracket;

[0035] a-first rolling bearing, b-second rolling bearing;

[0036] 2-orifice device, 21-rotating blowout preventer, 22-tee, 23-flange reducer;

[0037] 3- flocculation and dosing device, 31- mixing tank, 32- medicine storage tank, 33- water inlet solenoid valve, 34- mixer, 35- first metering pump, 36- screw feeder, 37- second metering pump. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Combine Figure 1-7 The orifice purification device 1 of the present invention is provided with: a flocculation and filtration assembly 11, the flocculation and filtration assembly 11 is provided with at least a shell 111, and a first drum 113 and a second drum 116 are spaced apart in the shell 111; after the drilling flushing liquid passes into the first drum 113, it is subjected to preliminary centrifugal filtration, and then flocculated in the shell 111, and the flocculated liquid enters the second drum 116 for centrifugal filtration and is discharged; an agitation and filtration assembly 12 is axially inserted in the flocculation and filtration assembly to agitate and flocculate the liquid; the agitation and filtration assembly 12 and the flocculation and filtration assembly 11 move relative to each other along the axial direction. The device of the present invention adopts the principle of two-stage centrifugal dehydration, combined with flocculation reaction, and has a good purification effect. The flocculation reaction can adsorb 10 -3 The device can produce fine particles of 0.1 μm; the device has a compact structure and small size, making it easy to use in the narrow space of coal mines; it adopts an automated control solution, and the equipment runs synchronously when the mud pump is turned on, without the need for dedicated management; if it is promoted and used on a large scale, it can greatly reduce the water used in coal mine drilling, with significant social and economic benefits.

[0040] like Figure 2As shown, the orifice purification device 1 consists of a flocculation and filtration assembly 11 and an agitation and filtration assembly 12. The agitation and filtration assembly 12 is movable axially relative to the flocculation and filtration assembly 11. The agitation and filtration assembly 12 completely seals one coaxial end of the first and second drums 113, 116, and partially seals the other coaxial end. This is to ensure that, while achieving the closed filtration of the first drum 113, the drilling flushing fluid smoothly enters the first drum 113, undergoes centrifugal filtration through the holes in the drum wall, and then ensures that the flocculated liquid enters the end of the second drum 116 for a second centrifugal filtration. Since the outlet pipe 1113 is provided below the housing 111, the overall liquid flow direction is essentially axial, from the first drum 113 to the second drum 116, ensuring the centrifugal filtration effect.

[0041] In the disclosed embodiment, partial closure includes a semi-enclosed structure at the end of the first drum 113 and a perforated structure at the end of the second drum 116. The semi-enclosed structure ensures rapid inflow of drilling fluid, while the perforated structure generates a certain suction force under the centrifugal action of the second drum 116, sucking in the flocculated liquid in the space between the two drums, thereby ensuring smooth secondary centrifugation.

[0042] In the disclosed embodiment, the agitator / filter assembly 12 is provided with a shaft tube 121, on which are spaced apart a first baffle 122, a second baffle 123, a stirring paddle 124, a third baffle 125, and a fourth baffle 126. The first baffle 122 is a semicircular plate, the second baffle 123 and the fourth baffle 126 are circular plates, and the third baffle 125 is a perforated plate. The first baffle 122 is a semicircular plate that matches the end of the first drum 113, achieving a partially open seal. The second baffle 123 and the fourth baffle 126 are circular plates that match the same-direction ends of the first drum 113 and the second drum 116, achieving a fully closed seal. The third baffle 125 is a perforated plate that matches the perforated structure at the end of the second drum 116, achieving a complete operating effect.

[0043] In the embodiment of the present disclosure, the first drum 113 is a cylindrical structure with holes, the diameter of the holes is α, the value of α is determined by the particle size distribution characteristics of the returned rock cuttings, and the critical diameter of the rock cuttings particles with a cumulative mass fraction of 50% is taken; the second drum 116 is a cylindrical structure with holes, the diameter of the holes is β, the value of β is determined by a flocculation test and is smaller than the floc diameter.

[0044] In the embodiment of the present disclosure, a plurality of spray heads 1112 are embedded in the housing 111 ; a cover plate 1111 is provided below the housing 111 ; and a water outlet pipe 1113 is provided on the housing 111 below the second drum 116 .

[0045] In an embodiment of the present disclosure, a power assembly 118 is arranged outside the shell 111, and the power assembly 118 includes a motor base 1183, on which a motor 1181 is arranged, and the motor 1181 has a driving wheel 1182 and a belt 1184, and the end of the second drum 116 is a driven wheel 1185, and the belt 1184 connects the driven wheel 1185 and the driving wheel 1182.

[0046] like Figure 2 and 3 As shown, the diameter and length of the first drum 113 and the second drum 116 are calculated according to the amount of rock cuttings generated (the volume of the rock cuttings generated is calculated by the borehole diameter and the drill rod length (or the feed rate per round) and multiplied by the expansion coefficient). The first drum 113 is provided with holes with a diameter of α (the value of α is determined by the particle size distribution characteristics of the returned rock cuttings, and the critical diameter of the rock cutting particles with a cumulative mass fraction of 50% is taken); the second drum 116 is provided with holes with a diameter of β (the value of β is determined by flocculation tests, microscopic observations, etc., and is preferably slightly smaller than the floc diameter); the first annular baffle 114 is provided with holes with a diameter of α; the housing 111 and the flange end plate 112, the first annular baffle 114, the second annular baffle 115, the annular end plate 117 and the motor are connected. The seat 1183 is assembled into one by welding; the first roller 113 and the second roller 116 are connected to the above-mentioned assembly through the first rolling bearing a and the second rolling bearing b, and can realize relative rotation; the motor 1181 is installed on the motor seat 1183 by bolts; the driving wheel 1182 is installed on the output shaft of the motor 1181; the driven wheel 1185 is installed on the extension section of the second roller 116; the driving wheel 1182 and the driven wheel 1185 are connected by a belt 1184; the cover 1111 is connected to the shell 111 through a hinge, and a sealing groove is provided on the cover 1111, and a sealing ring is installed, which is opened and closed by a metal lock; the spray head 1112 is provided with a scattered liquid spray port inside, for example, the shell 111 is arranged with three spray heads 1112 respectively installed on the shell 111 as shown in FIG. Figure 4 The outlet pipe 1113 is welded and mounted on the housing 111 as shown in the three threaded holes; Figure 4 The bracket 13 is provided with a first telescopic leg and a second telescopic leg which are fixedly connected to the housing 111 by bolts.

[0047] like Figure 5 As shown, the stirring and filtering assembly 12 is provided with a tube shaft 121; the first baffle 122, the second baffle 123, the stirring paddle 124, the third baffle 125, the fourth baffle 126 and the clamp fixing plate 127 are all welded to the tube shaft 121, and the welding position is shown in the figure; the hydraulic clamp 128 is fixed to the clamp fixing plate 127 by bolts.

[0048] like Figure 3-5As shown, the first drum 113 and the second drum 116 of the flocculation and filtration assembly 11 are provided with "grooves", and the outer edges of the first baffle 122 and the third baffle 125 of the stirring and filtration assembly 12 are provided with limiting "protrusions", which are respectively the first limiting protrusion 1221 and the second limiting protrusion 1251. The grooves cooperate with the "protrusions" to realize the two functions of axial sliding positioning and circumferential rotation torque transmission. When the reduction motor drives the second drum 116 to rotate through the belt pair, the stirring and filtration assembly 12 and the first drum 113 will rotate synchronously.

[0049] like Figure 6 As shown, the orifice device 2 consists of a rotary blowout preventer 21, a tee 22 and a flange reducer 23, all of which are connected by bolts; the tee 22 is not a mandatory device and can be installed as needed.

[0050] like Figure 7 As shown, the flocculation and dosing device 3 is configured as follows: a metering pump mounting seat, a stirrer mounting seat, a screw feeder mounting seat, a water inlet nozzle, etc. are provided on the box body composed of a stirring box 31 and a medicine storage box 32, which is convenient for the installation of supporting equipment; the discharge port of the screw feeder 36 is at the top of the stirring box 31; the stirring box 31 is equipped with a water inlet solenoid valve 33, a stirrer 34 and a first metering pump 35; the liquid suction port of the first metering pump 35 is at the lower part of the stirring box 31, and the liquid outlet is at the upper part of the medicine storage box; the liquid suction port of the second metering pump 37 is at the lower part of the liquid storage box 32, and the liquid outlet is connected to the spray head 1112 via a delivery hose (as shown in FIG. Figure 1 shown).

[0051] The embodiment of the present invention provides a near-horizontal drilling flushing fluid orifice purification system, such as Figure 1 As shown, the system includes: an orifice purification device 1, an orifice device 2 and a flocculation and dosing device 3, as well as several connecting pipelines and connecting wires; the flocculation and dosing device 3 can use a PLC programmable controller to realize the automatic operation of drug dispensing and adding drugs, and can be linked with the orifice purification device 1, mud pump truck and other devices.

[0052] The method for using the near-horizontal drilling flushing fluid orifice purification system of the present invention comprises the following steps:

[0053] 1. Preparation: Lower the drill bit and front drilling tool into the casing, leaving a portion outside the casing, and use a lifting device to press the orifice device 2 and the flushing liquid orifice purification device 1. Figure 1 Install and fix the orifice casing in the order shown. After installation, ensure that the tail of the drill tool in the casing is convenient for connection with the drill pipe behind. After the bolt connection is completed, adjust the telescopic length of each leg according to the actual situation, insert the steel pin to fix it, and after ensuring that the installation is stable, connect the flocculation and dosing device 3;

[0054] 2. Flocculation and dosing device prepares flocculants: solid drugs are added to the hopper of the screw feeder 36, water is added, and the mixer 34 is started. Flocculants are prepared according to the required amount, usually enough for one shift (8 hours) and kept on standby;

[0055] 3. Drilling construction and flushing fluid purification: The pump is turned on, the drilling rig drills, and the return water from the orifice flows into the orifice purification device 1 through the orifice device 2. The motor 1181 of the orifice purification device 1 drives the belt, driving the first roller 113, the second roller 116 and the stirring paddle 124 to rotate at high speed. During this process, the flushing fluid first flows through the high-speed rotating first roller 113, and the coarse particles (diameter greater than a) are retained in the first roller 113. The remaining flushing fluid is "thrown out" and flows through the annulus through the middle cavity. The flocculation and dosing device 3 sprays the flocculant into the middle cavity through the spray head. After being stirred by the stirring paddle 124, a flocculation reaction occurs, and small-diameter rock chips gather into agglomerates and enter the high-speed rotating second roller 116 through the holes on the third baffle 125. After being filtered through the barrel holes of the second roller 116, the rock chips remain inside the second roller. The purified clean water is discharged through the outlet pipe 1113 and enters the water tank for recycling.

[0056] 4. Deslagging: After completing the drilling of a drill rod (usually 1.5m or 3m), stop drilling, close the rotary blowout preventer 21 to seal the flushing fluid in the hole, open the metal lock of the cover plate 1111, operate the hydraulic clamp 128 to clamp the drill rod, pull back the drill rod, and pull out the stirring and filtering assembly 12 (such as Figure 2 As shown in FIG5 ), the rock chips in the first drum 113 and the second drum 116 are pushed out by the baffle, completing the slag discharge;

[0057] 5. Cleaning the drum: Push the stirring and filtering assembly 12 into the flocculation and filtering assembly 11 through the drill rod, start the motor 1181 to drive the stirring and filtering assembly 12 to rotate, connect the spray head 1112 to the clean water pipe (static pressure water in coal mines), and clean the drum. After cleaning, close the cover 1111;

[0058] 6. Form a loop: Repeat steps 3 and 5 to form a loop.

[0059] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0061] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An orifice purification device, characterized in that: The flocculation and filtration assembly (11) comprises a housing (111), wherein a first drum (113) and a second drum (116) are spaced apart in the housing (111); and a stirring and filtration assembly (12) is arranged axially interlaced between the first drum (113) and the second drum (116); The drilling flushing fluid is passed from the end into the first drum (113) for preliminary centrifugal filtration, and then stirred and flocculated by the stirring and filtering assembly (12) in the housing (111). The flocculated liquid enters the second drum (116) from the end for secondary centrifugal filtration and is then discharged; The stirring and filtering assembly (12) completely seals one co-directional axial end of the first drum (113) and the second drum (116), and partially seals the other co-directional axial end; The partial closure includes: the end of the first drum (113) is a semi-closed structure, and the end of the second drum (116) is a hole structure; The stirring and filtering assembly (12) comprises an axial tube (121) arranged along the axial direction, and a first baffle (122), a second baffle (123), a stirring paddle (124), a third baffle (125) and a fourth baffle (126) are arranged at intervals on the axial tube (121); the first baffle (122) is a semicircular plate, the second baffle (123) and the fourth baffle (126) are circular plates, and the third baffle (125) is a perforated plate; The first drum (113) is a cylindrical structure with holes, the diameter of the holes is α, the value of α is determined by the particle size distribution characteristics of the returned rock cuttings, and the critical diameter of the rock cuttings particles with a cumulative mass fraction of 50% is taken; the second drum (116) is a cylindrical structure with holes, the diameter of the holes is β, the value of β is determined by a flocculation test, and the diameter of the holes β is smaller than the floc diameter.

2. The orifice cleaning device according to claim 1, characterized in that: A plurality of spray heads (1112) are embedded in the housing (111); A cover plate (1111) is provided below the shell (111), and a water outlet pipe (1113) is provided on the shell (111) below the second drum (116).

3. The orifice cleaning device according to claim 1 or 2, characterized in that: A power assembly (118) is arranged outside the housing (111), the power assembly (118) comprising a motor seat (1183), a motor (1181) being arranged on the motor seat (1183), the motor (1181) being provided with a driving wheel (1182) and a belt (1184), the end of the second drum (116) being a driven wheel (1185), and the belt (1184) connecting the driven wheel (1185) and the driving wheel (1182).

4. A near-horizontal drilling flushing fluid orifice purification system, characterized in that: It comprises an orifice purification device (1), wherein the water inlet end of the orifice purification device (1) is connected to the orifice device (2), and the shell (111) of the orifice purification device (1) is connected to the flocculation and dosing device (3); The orifice cleaning device (1) is the orifice cleaning device (1) according to any one of claims 1 to 3.

5. The near-horizontal drilling flushing fluid orifice purification system according to claim 4, characterized in that: The flocculation and dosing device (3) comprises a stirring box (31) and a drug storage box (32) arranged in parallel; The mixing box (31) is connected to a water inlet electromagnetic valve (33) and a first metering pump (35), and a mixer (34) is arranged inside. A screw feeder (36) is provided on the medicine storage box (32), and the screw feeder (36) is connected to a second metering pump (37).

6. The near-horizontal drilling flushing fluid orifice purification system according to claim 5, characterized in that: The orifice device (2) is sequentially connected to a rotary blowout preventer (21), a tee (22) and a flange reducer (23).

Images