Gas box rotation stopping device for drilling machine

Abstract

The invention discloses a gas box rotation stopping device for a drilling machine, which belongs to the technical field of geothermal well drilling and comprises two oppositely arranged T-shaped brackets, floating lug plates are connected to the lower parts of the inner sides of the T-shaped brackets, a split type hoop is arranged between the two floating lug plates, and the split type hoop and the floating lug plates are movably connected in the vertical direction. A tooth plate is arranged on the inner side of the split type hoop and used for clamping a gas box shell, and tooth plate stop pins are arranged on the split type hoop and located above and below the tooth plate. The air box clamping device is suitable for air box clamping, the air box can be effectively prevented from rotating, the floating requirement of a power head is met, and air box clamping is stable.

Description

Technical Field

[0001] The invention relates to an air box anti-rotation device for a drilling rig, belonging to the technical field of geothermal well drilling. Background Art

[0002] With the widespread use of geothermal resources, the drilling technology and methods of geothermal wells are in urgent need of updating. Improving the construction efficiency of geothermal wells and reducing the construction cost of geothermal wells are the key to the drilling and construction of geothermal well projects. In the exploration and development of deep bedrock geothermal resources, the gas lift reverse circulation drilling process is favored because of its advantages such as low energy consumption, clean bottom of the hole, high drilling efficiency, and reservoir protection. Gas lift reverse circulation drilling is a drilling process that uses compressed air to inject into the drill string to reduce the fluid density in the drill string, thereby changing the pressure difference of the liquid column inside and outside the drill string. Under the pressure difference of the liquid column inside and outside the drill string, the drilling fluid flows from the outer annulus of the drill string and returns from the inner annulus of the drill string. The air compressor injects compressed air into the inner tube of the double-wall drill pipe through the gas supply pipeline, gas box, double-wall active drill pipe, double-wall drill pipe, and gas-water mixer. The gas mixes with the drilling fluid to form a mixed fluid with a density lower than that of the drilling fluid. The gas entering the inner tube of the double-wall drill pipe rises rapidly along the inner tube, producing a gas lift effect.

[0003] In the gas lift reverse circulation drilling process, the gas box is an air intake device for high-pressure air to enter the double-wall drill bit, and is an important component of the double-wall drill bit. At present, there is a lack of gas box anti-rotation matching devices suitable for drilling rigs at domestic construction sites. This problem has restricted the development of the gas lift reverse circulation drilling process to a certain extent. The fixation of the gas box at the construction site is often extensive. Generally, ordinary clamps are used to clamp the gas box and then connect it to the fixed part of the drilling rig through a connecting rod. This fixing device has the following defects: the anti-rotation effect of the gas box is very small, and the back and forth rotation of the gas box drives the connecting rod to make a collision noise; it cannot meet the floating requirements of the power head while the gas box is anti-rotating; the ordinary clamp clamping device is not stable enough and it is very easy for the gas box to be detached, resulting in immeasurable consequences. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an air box anti-rotation device for a drilling rig, which can effectively prevent the air box from rotating, and also meet the floating requirements of the power head and firmly clamp the air box.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A gas box anti-rotation device for a drilling rig comprises two T-shaped brackets arranged opposite to each other, a floating ear plate is connected to the lower inner side of the T-shaped bracket, a split clamp is arranged between the two floating ear plates, the split clamp is movably connected to the floating ear plate in the up and down directions, a tooth plate is arranged on the inner side of the split clamp, the tooth plate is used to clamp the gas box shell, and a tooth plate stop pin is arranged on the split clamp and above and below the tooth plate.

[0007] The cross bracing portion of the T-shaped bracket is provided with a supporting foot, and the supporting foot is fixed to the inner side of the power head ear plate through a pin shaft.

[0008] Ribs are arranged on both sides of the main arm of the T-shaped bracket.

[0009] The T-shaped bracket and the floating ear plate are connected by welding.

[0010] The split clamp includes two semicircular parts arranged opposite to each other, connecting plates are arranged on both sides of the semicircular parts, the floating ear plate is located between the two connecting plates, an oblong hole is opened on the floating ear plate along the vertical direction, a bolt hole is opened on the connecting plate, and the bolt is locked by a nut after passing through the two bolt holes and the oblong hole.

[0011] A gasket is arranged between the inner side of the nut and the connecting plate.

[0012] A trapezoidal groove is provided on the inner wall of the split clamp, and the transverse cross-section of the tooth plate is trapezoidal. The tooth plate is installed in the trapezoidal groove. A tooth surface is provided on the tooth plate, and the tooth surface is higher than the inner wall of the split clamp. Pin holes for the tooth plate stop pin to pass through are respectively provided at the upper and lower positions in the trapezoidal groove.

[0013] The number of the tooth plates is N, wherein N is an integer greater than or equal to 3, and the tooth plates are evenly distributed along the inner ring of the split clamp.

[0014] Beneficial effects of the present invention: The present invention provides an air box anti-rotation device for a drilling rig. First, a double-supported T-shaped bracket replaces the traditional connecting rod structure, which can reduce the connection points and increase the integrity of the structure. The T-shaped bracket can be firmly fixed on the ear plates on both sides of the power head, providing a reliable limit to prevent the air box from rotating, ensuring that the air box achieves an ideal anti-rotation effect, and greatly reducing the impact noise generated by the connection gap. In addition, the floating ear plate leaves a margin for the floating of the power head to meet the floating requirements of the power head. Finally, the air box is clamped in the form of a split clamp. The split clamp meets the requirements of convenient disassembly and installation during on-site construction. A tooth plate is arranged in the split clamp, which is tightly pressed on the outer shell of the air box through the front and rear hoops. Compared with the traditional clamp, the clamping device greatly improves the reliability and reduces the risk of the air box falling or being thrown out. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an air box anti-rotation device of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the T-shaped bracket and the floating ear plate in the present invention;

[0017] Figure 3 It is a structural schematic diagram of the split clamp in the present invention;

[0018] Figure 4 It is a structural schematic diagram of the tooth plate in the present invention;

[0019] Figure 5 It is a schematic diagram of the structure of the split clamp and the tooth plate in the present invention;

[0020] The reference numerals in the figure are as follows: 1-T-type bracket; 2-floating ear plate; 3-split clamp; 4-tooth plate; 5-tooth plate stop pin; 11-support foot; 12-rib plate; 21-oblong hole; 31-trapezoidal groove; 32-pin hole; 33-connecting plate; 34-gasket; 35-bolt; 36-nut; 41-tooth surface. DETAILED DESCRIPTION

[0021] Example 1

[0022] like Figure 1 and Figure 5 As shown, the present invention discloses an air box anti-rotation device for a drilling rig, comprising two T-shaped brackets 1 arranged opposite to each other, which are used to connect with the ear plates of the power head, and provide a reliable limit to prevent the air box from rotating. A floating ear plate 2 is connected to the lower inner part of the T-shaped bracket 1, and a split clamp 3 is arranged between the two floating ear plates 2. The split clamp 3 and the floating ear plate 2 are movably connected in the upper and lower directions to meet the floating requirements of the power head. A tooth plate 4 is arranged on the inner side of the split clamp 3, and the tooth plate 4 is used to clamp the air box shell, and the clamping stability of the split clamp 3 is improved by the tooth plate 4. A tooth plate stop pin 5 is arranged on the split clamp 3 and located above and below the tooth plate 4 to realize the upper and lower position fixing function of the tooth plate 4.

[0023] The present invention firstly replaces the traditional connecting rod structure with a double-supported T-shaped bracket. The T-shaped bracket can be firmly fixed on the ear plates on both sides of the power head, providing a reliable limit to prevent the air box from rotating, thereby ensuring that the air box achieves an ideal anti-rotation effect. In addition, the floating ear plate leaves a margin for the floating of the power head to meet the floating requirement of the power head. Finally, the air box is clamped in the form of a split clamp. The split clamp meets the requirements of convenient disassembly and installation during on-site construction. A tooth plate is arranged in the split clamp, which is tightly pressed against the outer shell of the air box through the front and rear hoops. Compared with the traditional clamp, the clamping device greatly improves the reliability, avoids the detachment of the air box, and can effectively reduce the risk of accidents.

[0024] Example 2

[0025] like Figure 1 and Figure 5 As shown, the present invention discloses a drilling rig air box anti-rotation device, comprising two T-shaped brackets 1 arranged opposite to each other, which has the advantages of being stable and reliable and also adapts to the spatial structure of the power head ear plate. Figure 2 As shown, the cross brace of the T-shaped bracket 1 is provided with a support foot 11, and the support foot 11 is fixed to the inner side of the power head ear plate through a pin shaft. The double-supported T-shaped structure provides a reliable limit and fixing point to prevent the gas box shell from rotating, and also reserves installation space for the power head ear plate pin shaft. Ribs 12 are provided on both sides of the main arm of the T-shaped bracket 1 to strengthen the strength of the T-shaped bracket 1.

[0026] The lower inner part of the T-shaped bracket 1 is connected to a floating lug plate 2, and the T-shaped bracket 1 and the floating lug plate 2 are welded. Figure 2 As shown, the floating ear plate 2 is provided with an oblong hole 21 in the vertical direction to provide left and right limit for rotation and reserve space for the power head to float. A split clamp 3 is provided between the two floating ear plates 2. The split clamp 3 is movably connected to the floating ear plate 2 in the vertical direction to meet the floating requirements of the power head. Figure 3 As shown, the split clamp 3 includes two semicircular parts arranged opposite to each other, which can meet the requirements of convenient disassembly during on-site construction. Connecting plates 33 are arranged on both sides of the semicircular parts, and the floating ear plate 2 is located between the two connecting plates 33. Bolt holes are opened on the connecting plates 33, and bolts 35 pass through the two bolt holes and the oblong hole 21 and are locked by nuts 36. A gasket 34 is arranged between the inner side of the nut 36 and the connecting plate 33.

[0027] The inner side of the split clamp 3 is provided with a tooth plate 4, the number of which is N, where N is an integer greater than or equal to 3. The tooth plates 4 are evenly distributed along the inner ring of the split clamp 3. In this embodiment, the number of the tooth plates 4 is 5. The tooth plates 4 are used to clamp the gas box shell, and the clamping stability of the split clamp 3 is improved by the tooth plates 4. In view of the problem that the clamping device is easy to wear and needs to be replaced frequently, Figure 3 As shown, the inner wall of the split clamp 3 is provided with a trapezoidal groove 31, the transverse cross section of the tooth plate 4 is a trapezoid, and the tooth plate 4 is embedded in the trapezoidal groove 31, as shown in FIG. Figure 4 As shown, the tooth plate 4 is provided with a tooth surface 41, and the tooth surface 41 is slightly higher than the inner wall of the split clamp 3, so that the tooth plate 4 can be pressed by the front and rear clamps.

[0028] like Figure 3 and Figure 5As shown, a tooth plate stop pin 5 is provided on the split clamp 3 and located above and below the tooth plate 4, and pin holes 32 for the tooth plate stop pin 5 to pass through are respectively provided at the upper and lower positions in the trapezoidal groove 31, so as to realize the upper and lower position fixing function of the tooth plate 4. When the tooth plate 4 is worn and the clamping becomes loose, only the tooth plate 4 needs to be replaced in time, which reduces the construction cost.

[0029] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A drilling rig air box anti-rotation device, characterized in that: The invention comprises two T-shaped brackets (1) arranged opposite to each other, wherein the inner lower part of the T-shaped bracket (1) is connected to a floating ear plate (2), a split clamp (3) is arranged between the two floating ear plates (2), the split clamp (3) and the floating ear plates (2) are movably connected in the upper and lower directions, a tooth plate (4) is arranged on the inner side of the split clamp (3), and the tooth plate (4) is used to clamp the outer shell of the gas box, and a tooth plate stop pin (5) is arranged on the split clamp (3) and located above and below the tooth plate (4).

2. The drilling rig air box anti-rotation device according to claim 1, characterized in that: The cross bracing portion of the T-shaped bracket (1) is provided with a supporting foot (11), and the supporting foot (11) is fixed to the inner side of the power head ear plate via a pin shaft.

3. The drilling rig air box anti-rotation device according to claim 1, characterized in that: Rib plates (12) are provided on both sides of the main arm portion of the T-shaped bracket (1).

4. The drilling rig air box anti-rotation device according to claim 1, characterized in that: The T-shaped bracket (1) and the floating ear plate (2) are connected by welding.

5. The drilling rig air box anti-rotation device according to claim 1, characterized in that: The split clamp (3) comprises two semicircular parts arranged opposite to each other, connecting plates (33) are arranged on both sides of the semicircular parts, the floating ear plate (2) is located between the two connecting plates (33), an oblong hole (21) is provided on the floating ear plate (2) along the vertical direction, a bolt hole is provided on the connecting plate (33), and a bolt (35) is passed through the two bolt holes and the oblong hole (21) and then locked by a nut (36).

6. The drilling rig air box anti-rotation device according to claim 5, characterized in that: A gasket (34) is provided between the inner side of the nut (36) and the connecting plate (33).

7. The drilling rig air box anti-rotation device according to claim 1, characterized in that: The inner wall of the split clamp (3) is provided with a trapezoidal groove (31); the transverse cross section of the tooth plate (4) is trapezoidal; the tooth plate (4) is installed in the trapezoidal groove (31); a tooth surface (41) is provided on the tooth plate (4); the tooth surface (41) is higher than the inner wall of the split clamp (3); and pin holes (32) for the tooth plate stop pin (5) to pass through are respectively provided at upper and lower positions in the trapezoidal groove (31).

8. The drilling rig air box anti-rotation device according to claim 1, characterized in that: The number of the tooth plates (4) is N, wherein N is an integer greater than or equal to 3, and the tooth plates (4) are evenly distributed along the inner circle of the split clamp (3).

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