A mud separation tank for a reverse circulation drilling rig

Abstract

The utility model relates to the field of slurry wall protection drilling, especially relates to a slurry separation tank for reverse circulation drilling machine, including primary sedimentation tank, secondary sedimentation tank, residue storage tank, slurry input pipe, sand separating mechanism and slurry output pipe, secondary sedimentation tank is connected with primary sedimentation tank, residue storage tank is connected with secondary sedimentation tank, and the lateral wall of primary sedimentation tank is provided with overflow, and overflow is communicated with secondary sedimentation tank, slurry input pipe is connected with primary sedimentation tank, and slurry input pipe is used for injecting slurry to primary sedimentation tank, sand separating mechanism is connected with secondary sedimentation tank, and sand separating mechanism is communicated with residue storage tank, slurry output pipe is communicated with secondary sedimentation tank, and the sludge suction efficiency in secondary sedimentation tank is increased by setting conical fairing on the circulating pipeline, the slurry that is extracted from pile foundation hole is discharged into primary sedimentation tank through slurry input pipe and carries out preliminary deposition, the slurry after preliminary deposition enters secondary sedimentation tank through overflow, and the drilling residue of smaller particle is removed by slurry through sand separating mechanism.

Description

Technical Field

[0001] This utility model relates to the field of mud wall drilling, and in particular to a mud separation box for reverse circulation drilling rigs. Background Technology

[0002] Mud wall drilling uses circulating mud with a density greater than 1 to form a dense mud cake on the borehole wall, which maintains the stability of the borehole wall with the pressure of the liquid column. The mud can also carry drill cuttings and cool the drill bit. The drilling, cleaning, cage lowering, and grouting processes can be completed by rotary drilling, percussion drilling, submersible drilling or percussion grab drilling. It is the preferred drilling method for deep foundation projects such as high-rise buildings, bridges, and subways.

[0003] However, the mud discharged from the pile foundation hole after drilling carries a large amount of drill cuttings. If the drill cuttings are not effectively settled or separated, they will flow back into the hole, which will weaken the mud's ability to carry cuttings. The drill cuttings cannot be discharged in time and will be repeatedly broken at the bottom of the hole, thereby reducing drilling efficiency. Existing sedimentation tanks have insufficient suction force of mud-water separation mechanism to the mud and sand at the bottom of the sedimentation tank, resulting in the accumulation of mud and sand at the bottom of the sedimentation tank. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the mud discharged from the pile foundation hole carrying a large amount of drilling cuttings, and the insufficient suction force of the mud-water separation mechanism on the bottom of the sedimentation tank, which leads to the accumulation of mud and sand at the bottom of the sedimentation tank. This invention provides a mud separation box for reverse circulation drilling rigs.

[0005] This utility model provides a mud separator for reverse circulation drilling rigs, comprising: The system includes a primary sedimentation tank, a secondary sedimentation tank, and a slag storage tank. The secondary sedimentation tank is connected to the primary sedimentation tank, and the slag storage tank is connected to the secondary sedimentation tank. An overflow outlet is provided on the side wall of the primary sedimentation tank, and the overflow outlet is connected to the secondary sedimentation tank. A mud inlet pipe is connected to the primary sedimentation tank and is used to inject mud into the primary sedimentation tank. The sand separating mechanism is connected to the secondary sedimentation tank and communicates with the slag storage tank. The sand separating mechanism is equipped with a circulation pipeline, and both ends of the circulation pipeline extend into the secondary sedimentation tank. The inlet end of the circulation pipeline is equipped with a conical guide hood, and the side wall of the conical guide hood has three inclined slurry inlets, which are communicated with the circulation pipeline. A mud discharge pipe is connected to the secondary sedimentation tank. Preferably, the primary sedimentation tank and the slag storage tank are located on opposite sides of the secondary sedimentation tank, and the sand separating mechanism is located above the secondary sedimentation tank.

[0006] Preferably, the heights of the primary sedimentation tank, the secondary sedimentation tank, and the slag storage tank decrease sequentially.

[0007] Preferably, a guide plate is provided on the side wall of the primary sedimentation tank, the guide plate is connected to the overflow port, and the guide plate is located above the secondary sedimentation tank.

[0008] Preferably, the mud input pipe is detachably connected to the primary sedimentation tank.

[0009] Preferably, the sand separating mechanism is equipped with a mud pump and a circulation pipeline, the mud pump is connected to the circulation pipeline, and both ends of the circulation pipeline extend into the secondary sedimentation tank.

[0010] Preferably, the sand separating mechanism is equipped with a vibrating screen, the vibrating screen is equipped with a slag discharge port, and the slag discharge port is connected to the slag storage tank.

[0011] Preferably, the circulation pipeline is equipped with a hydrocyclone, and the slag outlet of the hydrocyclone is connected to the vibrating screen.

[0012] Preferably, the outlet end of the circulation pipeline is connected to the bottom of the secondary sedimentation tank, and the inlet end of the circulation pipeline is spaced apart from the bottom of the secondary sedimentation tank.

[0013] Preferably, the primary sedimentation tank, the secondary sedimentation tank, and the slag storage tank are integrally formed box-shaped structural components. Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model provides a mud separation box for reverse circulation drilling rigs. Mud extracted from the pile foundation hole is discharged into a primary sedimentation tank through a mud input pipe for preliminary sedimentation, where large drill cuttings are settled. The pre-sedimented mud then flows into a secondary sedimentation tank through an overflow outlet. In the secondary sedimentation tank, a sand separating mechanism removes smaller drill cuttings, making the mud in the secondary sedimentation tank suitable for reuse. The mud is then discharged back into the pile foundation hole through a mud output pipe, enabling the reuse of mud. The drill cuttings separated by the sand separating mechanism are discharged into a slag storage tank. This design saves construction costs and improves the construction efficiency of mud-wall drilling. The inclined inlet creates a vortex flow, increasing the mud and sand absorption area and improving the fine cuttings intake efficiency, thus solving the problem of fine cuttings residue caused by the slow mud flow at the inlet end of the original pipeline.

[0014] 2. This utility model provides a mud separation box for reverse circulation drilling rigs. The mud undergoes preliminary sedimentation in a primary sedimentation tank and secondary sedimentation in a secondary sedimentation tank. At the same time, the mud in the secondary sedimentation tank is separated by a sand separating mechanism to remove smaller drill cuttings. The separated drill cuttings are discharged into a slag storage tank through the slag outlet. Finally, the mud is returned to the borehole through the mud output pipe, realizing the reuse of the mud. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a mud separation box for a reverse circulation drilling rig according to the present invention; Figure 2 This is a schematic diagram of the mud separation box for a reverse circulation drilling rig according to another perspective of the present invention; Figure 3 This is a schematic diagram of the circulation pipeline of a mud separator for a reverse circulation drilling rig according to the present invention. Figure 4 This is a schematic diagram of the structure of a conical guide shroud for a mud separation box in a reverse circulation drilling rig according to the present invention.

[0016] Marked in the image: 1- Primary sedimentation tank, 11- Overflow outlet, 12- Guide plate, 2- Secondary sedimentation tank, 3- Slag storage tank, 4- Slurry input pipe, 5- Slurry output pipe, 6- Sand separation mechanism, 61- Circulation pipeline, 611- First pipeline, 6111- First pipe section, 612- Second pipeline, 6121- Second pipe section, 613- Hydrocyclone, 62- Slurry pump, 63- Vibrating screen, 64- Slag discharge outlet, 65- Conical guide hood, 66- Slurry inlet. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0020] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0021] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0022] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0023] Example 1 like Figures 1-3As shown, a mud separation tank for a reverse circulation drilling rig specifically comprises a primary sedimentation tank 1, a secondary sedimentation tank 2, a slag storage tank 3, a mud inlet pipe 4, a sand separation mechanism 6, and a mud outlet pipe 5. The secondary sedimentation tank 2 is connected to the primary sedimentation tank 1, and the slag storage tank 3 is connected to the secondary sedimentation tank 2. An overflow port 11 is provided on the side wall of the primary sedimentation tank 1, and the overflow port 11 is connected to the secondary sedimentation tank 2. The mud, after preliminary sedimentation in the primary sedimentation tank 1, flows into the secondary sedimentation tank 2 through the overflow port 11. The mud inlet pipe 4 is connected to the primary sedimentation tank 1 and is used to inject mud into the primary sedimentation tank 1. The mud is connected to a pump located in the pile foundation hole for pumping out mud, allowing the mud pumped out by the pump to be discharged into the primary sedimentation tank 1. The sand separation mechanism... The 6-stage sedimentation tank is connected to the secondary sedimentation tank 2, and the sand separating mechanism 6 is connected to the slag storage tank 3. The sand separating mechanism 6 further separates the drill cuttings settled in the secondary sedimentation tank 2, so that the mud in the secondary sedimentation tank 2 meets the standard that can be used in the pile foundation hole. The mud output pipe 5 is connected to the secondary sedimentation tank 2, and the mud in the secondary sedimentation tank 2 is discharged into the pile foundation hole through the mud output pipe 5. The sand separating mechanism 6 is equipped with a circulation pipe 61, and both ends of the circulation pipe 61 extend into the secondary sedimentation tank 2. The inlet end of the circulation pipe 61 is equipped with a conical guide hood 65, and three inclined mud inlets 66 are opened on the side wall of the conical guide hood 65. The mud inlets 66 are connected to the circulation pipe 61. The distance between the bottom of the conical guide hood 65 and the bottom of the secondary sedimentation tank is 5cm-8cm.

[0024] The drilling mud extracted from the pile foundation borehole is discharged into the primary sedimentation tank 1 through the mud input pipe 4 for preliminary sedimentation, where large drill cuttings are settled. After preliminary sedimentation, the mud enters the secondary sedimentation tank 2 through the overflow port 11. The mud then passes through the sand separating mechanism 6 to remove smaller drill cuttings, thus making the mud in the secondary sedimentation tank 2 suitable for reuse. It is then discharged into the pile foundation borehole through the mud output pipe 5, enabling the reuse of the mud. The drill cuttings separated by the sand separating mechanism 6 are discharged into the slag storage tank 3. This saves construction costs and improves the construction efficiency of mud-wall drilling. The inclined inlet 66 creates a vortex flow, increasing the mud and sand absorption area and improving the fine cuttings suction efficiency, thus solving the problem of fine cuttings residue caused by the slow mud flow at the original pipeline inlet.

[0025] Specifically, a slurry discharge port is provided on the side wall of the secondary sedimentation tank 2. The slurry discharge port is connected to the mud output port and is spaced apart from the bottom of the secondary sedimentation tank 2 to prevent the drill cuttings settled in the secondary sedimentation tank 2 from being discharged into the pile foundation hole.

[0026] In one or more embodiments, the primary sedimentation tank 1 and the slag storage tank 3 are located on opposite sides of the secondary sedimentation tank 2. After passing through the primary sedimentation tank 1, the drilling mud enters the secondary sedimentation tank 2. In the secondary sedimentation tank 2, it is separated by the sand separating mechanism 6, causing the drilling cuttings to be discharged into the slag storage tank 3. The sand separating mechanism 6 is located above the secondary sedimentation tank 2. The drilling cuttings separated by the sand separating mechanism 6 enter the slag storage tank 3, and the drilling mud falls into the secondary sedimentation tank 2 under the action of gravity.

[0027] In an optional embodiment, the heights of the primary sedimentation tank 1, the secondary sedimentation tank 2, and the slag storage tank 3 decrease sequentially. The mud flowing out from the overflow port 11 flows into the secondary sedimentation tank 2 under gravity, which facilitates the drilling cuttings to roll off the sand separating mechanism 6 into the slag storage tank 3, thus avoiding environmental pollution.

[0028] In an optional embodiment, a guide plate 12 is provided on the side wall of the primary sedimentation tank 1. The guide plate 12 is connected to the overflow port 11. The guide plate 12 is located above the secondary sedimentation tank 2. The guide plate 12 is inclined to facilitate the flow of sludge into the secondary sedimentation tank 2 and prevent the sludge from sticking to the outer wall of the primary sedimentation tank 1.

[0029] In one or more embodiments, the mud input pipe 4 is detachably connected to the primary sedimentation tank 1, and the end of the mud input pipe 4 is located above the primary sedimentation tank 1, so that the installation position of the mud input pipe 4 can be adjusted according to the position of the pile hole to adapt to complex construction environments. Specifically, the end of the mud input pipe 4 should be offset from the overflow port 11 to prevent large pieces of sand and gravel from entering the secondary sedimentation tank 2 from the overflow port 11.

[0030] In one or more embodiments, the sand separating mechanism 6 is equipped with a mud pump 62 and a circulation pipeline 61. The mud pump 62 draws mud from the secondary sedimentation tank 2 and circulates it in the circulation pipeline 61. The mud pump 62 is connected to the circulation pipeline 61, and both ends of the circulation pipeline 61 extend into the secondary sedimentation tank 2. When the mud flows in the circulation pipeline 61, the drill cuttings are separated, allowing the drill cuttings to enter the sand separating mechanism 6, and the mud is discharged into the secondary sedimentation tank 2.

[0031] In an optional embodiment, the sand separating mechanism 6 is equipped with a vibrating screen 63, which can perform a screening action to separate mud and drilling cuttings. The vibrating screen 63 is equipped with a slag discharge port 64, which is connected to the slag storage tank 3, so that the drilling cuttings enter the slag storage tank 3 through the slag discharge port 64.

[0032] In an optional embodiment, the circulation pipeline 61 is equipped with a hydrocyclone 613. The slag outlet of the hydrocyclone 613 is connected to the vibrating screen 63. The hydrocyclone 613 uses the centrifugal force field generated by the tangential high-speed feeding to throw the dense, coarse sand particles toward the wall of the device and spiral downwards along the cone, and discharge from the sand discharge nozzle. Meanwhile, the less dense, fine particles spiral upwards with the liquid phase and are discharged from the upper outlet, thereby achieving the separation of drilling slag. The drilling slag discharged from the sand discharge nozzle enters the sand separating mechanism 6 for further screening. Specifically, the circulation pipeline 61 is composed of a first pipeline 611 and a second pipeline 612. Along the flow direction of the mud in the circulation pipeline 61, the end of the first pipeline 611 is provided with a horizontally arranged first pipe section 6111, and the beginning of the second pipeline 612 is provided with a horizontally arranged second pipe section 6121. The first pipe section 6111 and the second pipe section 6121 are parallel to each other, and the first pipe section 6111 and the second pipe section 6121 are connected through the hydrocyclone 613.

[0033] In an optional embodiment, the outlet end of the circulation pipe 61 is connected to the bottom of the secondary sedimentation tank 2, and the inlet end of the circulation pipe 61 is spaced apart from the bottom of the secondary sedimentation tank 2. The sludge discharged from the circulation pipe 61 impacts the bottom of the secondary sedimentation tank 2, causing the sludge to be lifted up, making it easier for the sludge in the secondary sedimentation tank 2 to enter the circulation pipe 61, thereby ensuring that the sludge in the secondary sedimentation tank 2 meets the usage requirements.

[0034] In one or more embodiments, the primary sedimentation tank 1, the secondary sedimentation tank 2, and the slag storage tank 3 are integrally formed box-shaped structural components, which are convenient for transportation and arrangement.

[0035] In an optional embodiment, a drain outlet is provided on the side wall of the secondary sedimentation tank 2, and a drain valve is connected to the drain outlet.

[0036] This embodiment of a mud separation tank for a reverse circulation drilling rig employs a two-stage sedimentation method. Mud is pumped from the pile foundation borehole to a primary sedimentation tank 1 for initial sedimentation, removing larger drill cuttings. The mud then overflows from the top of the primary sedimentation tank 1 through an overflow outlet 11 into a secondary sedimentation tank 2 for further sedimentation. Finally, it flows back into the pile foundation borehole from the secondary sedimentation tank 2 via a mud output pipe 5. A sand-separating mechanism is installed at the top of the secondary sedimentation tank 2 to circulate and extract mud from it, further separating the mud and sand. The separated drill cuttings are collected in a slag storage tank 3. This method achieves rapid removal of drill cuttings from the mud, improving construction efficiency and realizing mud recycling, resulting in a green and environmentally friendly solution.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mud separator for a reverse circulation drilling rig, characterized in that, include: A primary sedimentation tank (1), a secondary sedimentation tank (2), and a slag storage tank (3) are provided. The secondary sedimentation tank (2) is connected to the primary sedimentation tank (1), and the slag storage tank (3) is connected to the secondary sedimentation tank (2). An overflow port (11) is provided on the side wall of the primary sedimentation tank (1), and the overflow port (11) is connected to the secondary sedimentation tank (2). A mud input pipe (4) is connected to the primary sedimentation tank (1) and is used to inject mud into the primary sedimentation tank (1). The sand separating mechanism (6) is connected to the secondary sedimentation tank (2) and is also connected to the slag storage tank (3). The sand separating mechanism (6) is provided with a circulation pipe (61), and both ends of the circulation pipe (61) extend into the secondary sedimentation tank (2). The inlet end of the circulation pipe (61) is provided with a conical guide hood (65), and the side wall of the conical guide hood (65) has three inclined slurry inlets (66), which are connected to the circulation pipe (61). The mud output pipe (5) is connected to the secondary sedimentation tank (2).

2. A mud separation tank for a reverse circulation drilling rig as claimed in claim 1 wherein, The primary sedimentation tank (1) and the slag storage tank (3) are located on opposite sides of the secondary sedimentation tank (2), and the sand separation mechanism (6) is located above the secondary sedimentation tank (2).

3. A mud separation tank for a reverse circulation drilling rig as claimed in claim 2, characterised in that, The heights of the primary sedimentation tank (1), the secondary sedimentation tank (2), and the slag storage tank (3) decrease sequentially.

4. A mud separation tank for a reverse circulation drilling rig as claimed in claim 3, characterised in that, The primary sedimentation tank (1) is provided with a guide plate (12) on its side wall. The guide plate (12) is connected to the overflow port (11) and is located above the secondary sedimentation tank (2).

5. A mud separation tank for a reverse circulation drilling rig as claimed in claim 1 wherein, The mud input pipe (4) is detachably connected to the primary sedimentation tank (1).

6. A mud separation tank for a reverse circulation drilling rig as claimed in claim 1 wherein, The sand separating mechanism (6) is equipped with a mud pump (62), which is connected to the circulation pipeline (61).

7. A mud separation tank for a reverse circulation drilling rig as claimed in claim 6 wherein, The sand separating mechanism (6) is equipped with a vibrating screen (63), the vibrating screen (63) is equipped with a slag discharge port (64), and the slag discharge port (64) is connected to the slag storage tank (3).

8. A mud separation tank for a reverse circulation drilling rig as claimed in claim 7, characterised in that, The circulation pipeline (61) is equipped with a hydrocyclone (613), and the slag outlet of the hydrocyclone (613) is connected to the vibrating screen (63).

9. A mud separation tank for a reverse circulation drilling rig as claimed in claim 6 wherein, The outlet end of the circulation pipeline (61) is connected to the bottom of the secondary sedimentation tank (2), and the inlet end of the circulation pipeline (61) is spaced apart from the bottom of the secondary sedimentation tank (2).

10. A mud separation tank for a reverse circulation drilling rig as claimed in any one of claims 1 to 9, characterised in that, The primary sedimentation tank (1), the secondary sedimentation tank (2), and the slag storage tank (3) are integrally formed box-shaped structural components.

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