Reverse circulation submersible drilling rig

Abstract

The utility model relates to a reverse circulation submersible drilling rig. A large frame is hinged to the rear end of the frame, a distribution box and a generator are fixed to the frame, and a front supporting leg and a rear supporting leg are fixed to the lower portion of the frame. A power head is fixed on the large frame and driven by a drilling motor fixed on the large frame, an output pipe shaft is arranged in the center of the power head, the upper end of the output pipe shaft is communicated with a water inlet of a secondary pump in a sealed mode, the secondary pump is driven by a secondary pump motor fixed on the large frame, and the lower end of the output pipe shaft is communicated with a single water outlet of a Y-shaped water conveying pipe shaft in a sealed mode. Two water inlets of the Y-shaped water conveying pipe shaft are communicated in a sealed mode through upper openings of the left water conveying pipe shaft and the right water conveying pipe shaft respectively, lower openings of the left water conveying pipe shaft and the right water conveying pipe shaft are communicated with a left water outlet and a right water outlet of the first-stage pump in a sealed mode respectively, the first-stage pump is driven by a first-stage pump motor through a long shaft, and the first-stage pump motor is fixed to the high-position Y-shaped water conveying pipe shaft. A buffer rod is sealed and fixed on a water inlet of the primary pump; and a drill rod is sealed and fixed at the lower end of the buffer rod.

Description

Technical Field

[0001] This utility model relates to a drilling rig, and more particularly to a reverse circulation submersible drilling rig. Background Technology

[0002] The reverse circulation submersible drilling rig uses a submersible motor for its water pump. However, submersible motors have drawbacks. Because they operate underwater for extended periods, the vibrations generated during operation can loosen bolts, causing water to enter and burn out the motor. Vibration can also cause wear and tear on internal components such as the stator, rotor, and copper wires, leading to further motor failure. Submersible motors are expensive, and damage can disrupt project progress. Their complex manufacturing process means they cannot be repaired by non-specialized manufacturers, resulting in greater losses for users. Replacing a motor is also costly and time-consuming, causing even greater losses for the user. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a reverse circulation submersible drilling rig, which adopts a common variable frequency motor, has a simple structure, low cost, and is robust and easy to use.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a frame is hinged at the rear end of the chassis, a distribution box and a generator are fixed on the chassis, and front and rear support legs are fixed under the chassis; a power head is fixed on the frame, driven by a drilling motor fixed on the frame, and an output pipe shaft is located at the center of the power head. The upper end of the output pipe shaft is sealed to the inlet of the secondary pump, which is driven by a secondary pump motor fixed on the frame. The lower end of the output pipe shaft is sealed to the single outlet of the Y-shaped water delivery pipe shaft. The two inlets of the Y-shaped water delivery pipe shaft are sealed to each other through the upper openings of the left and right water delivery pipe shafts, respectively. The lower openings of the left and right water delivery pipe shafts are sealed to the left and right outlets of the primary pump, respectively. The primary pump is driven by a primary pump motor through a long shaft, and the primary pump motor is fixed on the high-positioned Y-shaped water delivery pipe shaft; a buffer rod is sealed and fixed on the inlet of the primary pump, and a drill rod is sealed and fixed at the lower end of the buffer rod.

[0005] This utility model has the following advantages: 1) It adopts a common frequency conversion motor, which has a simple structure, low cost, and is sturdy and durable; 2) The common frequency conversion motor is not submerged in water when the drilling rig is working, so the motor is not easily damaged; 3) The manufacturing process of the common frequency conversion motor is simple, and the cost is 25% lower than that of a submersible motor; 4) The common frequency conversion motor can be repaired by any motor repair shop, which is convenient and inexpensive; 5) The common frequency conversion motor can be equipped with a frequency converter to adjust the speed of the drill bit; 6) The common frequency conversion motor saves electricity, saving up to 30% of electricity consumption. Attached Figure Description

[0006] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0007] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0008] like Figure 1 As shown, the rear end of the frame 20 is hinged to the main frame 17. A distribution box 21 and a generator 22 are fixed on the frame 20. Front support legs 23 and rear support legs 19 are fixed to the bottom of the frame 20. A power head 14 is fixed on the main frame 17. The power head 14 is driven by a drilling motor (not shown in the figure) fixed on the main frame 17. An output pipe shaft 12 is located at the center of the power head 14. The upper end of the output pipe shaft 12 is sealed and connected to the inlet of the secondary pump 15. The secondary pump 15 is driven by a secondary pump motor 16 fixed on the main frame 17. The lower end of the output pipe shaft 12... The Y-shaped water supply pipe shaft 11 is sealed to a single outlet. The two inlets of the Y-shaped water supply pipe shaft 11 are sealed to the upper openings of the left water supply pipe shaft 7 and the right water supply pipe shaft 24, respectively. The lower openings of the left water supply pipe shaft 7 and the right water supply pipe shaft 24 are sealed to the left outlet 4 and the right outlet 3 of the primary pump 5, respectively. The primary pump 5 is driven by the primary pump motor 10 through the long shaft 6. The primary pump motor 10 is fixed on the Y-shaped water supply pipe shaft 11 at a high position. The buffer rod 2 is sealed and fixed on the inlet of the primary pump 5, and the lower end of the buffer rod 2 is sealed and fixed to the drill rod 1.

[0009] The Y-shaped water pipe shaft 11 is externally fixed with an electric slip ring, which provides power to the primary pump motor 10.

[0010] The long shaft 6 is externally fixed with a sleeve 8, which seals the long shaft 6 and the bearings at both ends, thereby improving its service life.

[0011] Since the primary pump motor 10 and the secondary pump motor 16 do not take in water during operation, they are both ordinary motors. If a variable frequency motor is used, they can be controlled and save electricity.

[0012] In use, a cylindrical water storage pit 9 is drilled at the well site. The diameter of the cylindrical water storage pit 9 ensures that the left and right water delivery pipe shafts 7 and 24 can rotate freely. The depth of the cylindrical water storage pit 9 ensures that the primary pump 5 is completely submerged, while the primary pump motor 10 is not exposed to water. The device is moved to the side of the cylindrical water storage pit 9, and the frame 17 is erected so that the drill rod is aligned with the well site to be drilled, i.e., the center of the cylindrical water storage pit 9. Water is injected into the cylindrical water storage pit 9 to submerge the primary pump 5. The power head motor and the primary pump motor 10 are turned on appropriately. The power head 14 drives the drill rod 1 to start drilling through the Y-shaped water delivery pipe shaft 11, the left water delivery pipe shaft 7, and the right water delivery pipe shaft 24. The drilling mud is pumped out by the primary pump 5 through the left water delivery pipe shaft 7, the right water delivery pipe shaft 24, the Y-shaped water delivery pipe shaft 11, and the secondary pump 15 to a water storage tank (not shown in the figure). After sedimentation, it can be reused.

[0013] During the drilling process, the water level in the cylindrical water storage pit 9 remains unchanged to ensure that the primary pump 5 can operate normally.

[0014] When replacing drill rod 1, simply lift the power head 14 upwards using a hydraulic cylinder.

Claims

1. A reverse circulation submersible drilling rig, characterized in that: The rear end of the frame (20) is hinged to a large frame (17), the frame (20) is fixed with a distribution box (21) and a generator (22), the lower end of the frame (20) is fixed with a front support leg (23) and a rear support leg (19); the power head (14) is fixed on the large frame (17), the power head (14) is driven by a drilling motor fixed on the large frame (17), the center of the power head (14) is provided with an output pipe shaft (12), the upper end of the output pipe shaft (12) is in sealed communication with the water inlet of the secondary pump (15), the secondary pump (15) is driven by a secondary pump motor (16) fixed on the large frame (17), the lower end of the output pipe shaft (12) is in sealed communication with the single water outlet of the Y-shaped water delivery pipe shaft (11), the two water inlets of the Y-shaped water delivery pipe shaft (11) are respectively in sealed communication with the upper openings of the left water delivery pipe shaft (7) and the right water delivery pipe shaft (24), the lower openings of the left water delivery pipe shaft (7) and the right water delivery pipe shaft (24) are respectively in sealed communication with the left water outlet (4) and the right water outlet (3) of the primary pump (5), the primary pump (5) is driven by a primary pump motor (10) through a long shaft (6), and the primary pump motor (10) is fixed on the high Y-shaped water delivery pipe shaft (11); the water inlet of the primary pump (5) is fixed with a buffer rod (2), and the lower end of the buffer rod (2) is fixed with a drill rod (1).

2. The reverse circulation submersible drilling rig of claim 1, wherein: The Y-shaped water delivery pipe shaft (11) is externally fixed with an electric slip ring to provide power supply for the primary pump motor (10).

3. The reverse circulation submersible drilling rig of claim 1, wherein: The long shaft (6) is externally fixed with a sleeve (8) to seal the bearings at both ends of the long shaft (6).

4. The reverse circulation submersible driller of claim 1, wherein: The primary pump motor (10) and the secondary pump motor (16) are common motors.

5. The reverse circulation submersible driller of claim 1, wherein: The large frame (17) comprises a fixed frame and a sliding frame, the fixed frame is hinged to the frame (20), the sliding frame is in sliding cooperation with the fixed frame, and the two are hinged through an oil cylinder, the sliding frame can slide relative to the fixed frame through the driving of the oil cylinder, and the power head (14), the secondary pump (15) and the secondary pump motor (16) are fixed on the sliding frame.

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