A coring wire rope cleaning device for a rope coring drill

Abstract

A wire rope cleaning device for a wireline coring drill is mounted on the top of the drill pipe. The device comprises a purge chamber and a high-pressure air chamber. The high-pressure air chamber is mounted outside the purge chamber, forming a sealed annular cavity between the two chambers. A high-pressure air inlet is provided on the outer wall of the high-pressure air chamber, connected to a high-pressure air pipe. Nozzles are circumferentially arranged on the outer wall of the purge chamber corresponding to the high-pressure air chamber. A purge chamber cover is fixed to the top of the purge chamber, and a wire rope hole is provided in the middle of the purge chamber cover. The device is mounted on the top of the drill pipe. During the travel of the wire rope, high-pressure gas is introduced into the purge chamber, and the purge chamber nozzle ejects high-pressure air to continuously purge and clean the wire rope. This ensures that the wire rope is free of mud and is substantially dry after leaving the purge chamber. This device solves the long-standing problem of mud adhesion to the coring wire rope, extends the service life of the wire rope, and prevents mud carried by the wire rope from contaminating operators and equipment involved in wireline coring operations.

Description

Technical Field

[0001] The invention relates to a cleaning device for a drilling tool, in particular to a cleaning device for a coring wire rope of a rope coring drilling tool. Background Art

[0002] Wireline coring drilling is a drilling method that allows for core extraction without lifting the drill string, or with minimal drill lifting. Its operational characteristics dictate that the entire drill string does not need to be pulled out of the borehole. Instead, a dedicated wireline overshoot is used to lift the cored inner tube at the bottom of the hole through the central hole of the drill string to the surface. This reduces the number of drill string lifts and lowers, as well as the auxiliary time required to raise and lower the drill string, thereby improving drilling efficiency. Because the wireline must be immersed in the mud within the drill string to retrieve the cored inner tube, drilling fluid adheres to the wireline when the overshoot is lifted from the drill string after the wireline is attached. This can cause corrosion and shorten its service life. Furthermore, during the lifting of the inner tube, drilling fluid attached to the wireline can splash onto the drilling platform in windy conditions, contaminating operators and equipment on the platform. Summary of the Invention

[0003] The purpose of the present invention is to overcome the drawbacks of the prior art and provide a coring wire rope cleaning device for a rope coring drill. The device can continuously blow the wire rope during the process of fishing the inner tube with the wire rope to remove the drilling fluid mud attached to the wire rope.

[0004] The problem described in the present invention is solved by the following technical solutions:

[0005] A coring wire rope cleaning device for a rope coring drill tool is installed on the top of the drill pipe. The device is provided with a purge chamber and a high-pressure air chamber. The high-pressure air chamber is mounted on the outside of the purge chamber. A closed annular cavity is formed between the high-pressure air chamber and the purge chamber. A high-pressure air inlet connected to a high-pressure air pipe is provided on the outer wall of the high-pressure air chamber. A nozzle is provided circumferentially on the outer wall of the purge chamber corresponding to the high-pressure air chamber. A purge chamber top cover is fixed on the top of the purge chamber, and a wire rope hole is provided in the middle of the purge chamber top cover.

[0006] The above-mentioned coring wire rope cleaning device for rope coring drilling tools has a drill rod mounting sleeve fixed to the bottom of the purge chamber, a drill rod mounting sleeve nested in the drill rod mounting sleeve, and several fastening bolts are radially provided at the lower part of the mounting sleeve, which pass through the mounting sleeve wall to lock the drill rod.

[0007] The coring wire rope cleaning device for a rope coring drill tool has a buffer chamber provided on the upper portion of the purge chamber, a buffer chamber top cover fixed on the top of the buffer chamber, and a wire rope hole provided in the middle of the buffer chamber top cover.

[0008] The above-mentioned coring wire rope cleaning device for a rope coring drill tool has a purge chamber provided with a mud overflow port, and the mud overflow port is located at the lower part of the high-pressure air chamber.

[0009] The above-mentioned coring wire rope cleaning device for rope coring drilling tools, the purge chamber top cover and the buffer chamber top cover are both composed of several fan-shaped rubber plates assembled into a circle, and the aperture of the purge chamber top cover wire rope hole and the buffer chamber top cover wire rope hole is 1-3 mm larger than the outer diameter of the wire rope.

[0010] In the above-mentioned core wire rope cleaning device for a rope coring drill, the outer wall nozzles of the high-pressure air chamber are provided with at least two rows, with 12-16 nozzles evenly distributed in each row.

[0011] The coring wire rope cleaning device for a rope coring drill tool has a connection plate welded to the outer wall of the purge chamber, the connection plate is bolted to the high-pressure air chamber, and a sealing ring is provided between the connection plate and the high-pressure air chamber.

[0012] The present invention is designed to address the problem of cleaning coring wire ropes. The device, mounted on the top of the drill pipe, features a purge chamber for cleaning mud from the wire rope. As the wire rope travels, high-pressure gas is introduced into the chamber, and a nozzle in the chamber sprays high-pressure air to continuously purge the wire rope. This ensures that the wire rope is free of mud and essentially dry after leaving the chamber. This solves the long-standing problem of mud adhering to coring wire ropes, extending the wire rope's service life and preventing mud carried by the wire rope from contaminating operators and equipment involved in rope coring operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 1. It is a structural diagram of the buffer chamber top cover;

[0016] Figure 3 、 Figure 4 It is a schematic diagram of drill pipe installation sleeves and drill pipe sleeves used for drill pipes of different specifications.

[0017] The numbers in the figure are: 1. Upper pressure plate; 2. Buffer chamber top cover; 3. Buffer chamber; 4. Purge chamber top cover; 5. High-pressure gas chamber; 6. High-pressure gas inlet; 7. Purge chamber; 8. Nozzle; 9. Sealing ring; 10. Connecting plate; 11. Mud overflow port; 12. Drill pipe sleeve; 13. Drill pipe installation sleeve; 14. Fastening bolts; 15. Drill pipe; 16. Wire rope. DETAILED DESCRIPTION

[0018] See Figure 1 、 Figure 2The present invention is installed at the top of a drill pipe 15 and comprises a purge chamber 7 for cleaning a steel wire rope 16 and a high-pressure gas chamber 5 for supplying high-pressure gas to the purge chamber. A buffer chamber is provided at the top of the purge chamber, and a drill pipe mounting sleeve 13 is provided at the bottom of the purge chamber for securing the drill pipe. The purge chamber is cylindrical, and nozzles 8 for ejecting high-pressure gas are circumferentially arranged on the outer wall of the upper portion of the purge chamber. The nozzles are arranged in at least two rows, with 12-16 nozzles evenly distributed in each row. The purge chamber is provided with a mud overflow port 11 located at the bottom of the high-pressure gas chamber. The mud overflow port is used to scrape and discharge mud adhered to the inner pipe during extraction. The cylindrical high-pressure gas chamber is fitted onto the outside of the purge chamber, forming a sealed annular cavity between the high-pressure gas chamber and the purge chamber. A connecting disc 10 is welded to the outer wall of the purge chamber, which is bolted to the high-pressure gas chamber. A sealing ring 9 is provided between the connecting disc and the high-pressure gas chamber to ensure the sealing of the high-pressure gas chamber. The outer wall of the high-pressure gas chamber is equipped with a high-pressure gas inlet 6 connected to the high-pressure gas pipe. A purge chamber cover 4 is fixed to the top of the purge chamber. The cover is composed of several circular sector-shaped rubber sheets, with a wire rope hole in the middle. The diameter of the wire rope hole is 1-3 mm larger than the outer diameter of the wire rope. The buffer chamber is used to decelerate the gas escaping from the purge chamber. The lower portion of the buffer chamber is bolted to the high-pressure gas chamber. The top of the buffer chamber is fixed to the buffer chamber cover 2 via an upper pressure plate 1. The buffer chamber cover is also composed of several circular sector-shaped rubber sheets, with a wire rope hole in the middle.

[0019] See Figure 1 、 Figure 3 and Figure 4 , a drill rod mounting sleeve 13 is fixed to the bottom of the purge chamber, a drill rod sleeve 12 is nested in the drill rod mounting sleeve, and a number of fastening bolts 14 are radially provided on the lower part of the mounting sleeve, and the fastening bolts pass through the wall of the mounting sleeve to lock the drill rod. The drill rod mounting sleeve is used to reliably fix the purge chamber to the top of the drill rod to avoid damage to the drill rod and the device caused by the impact formed at the moment of high-pressure air connection; the drill rod sleeve is used to limit the drill rods of corresponding specifications when installing drill rods of different specifications. The inner diameter of the drill rod sleeve matches the outer diameter of the drill rod, and the outer diameter of the drill rod sleeve matches the inner diameter of the drill rod mounting sleeve. The upper edge of the drill rod sleeve rests on the shoulder of the stepped hole of the drill rod mounting sleeve. When the device is used for drill rods of different specifications, the drill rod sleeve 12 that matches the drill rod can be replaced, such as Figure 3 、 Figure 4 shown.

[0020] Before the coring wire rope of the coring drill tool is lowered, the coring wire rope is installed on the top of the drill pipe. During the process of the wire rope lifting the inner tube upward, the high-pressure air chamber is connected to the compressed air pipeline, and the interior of the high-pressure air chamber is filled with high-pressure air. The high-pressure gas sprays high-speed air toward the wire rope traveling in the purge chamber through a nozzle, thereby realizing a purge and cleaning operation of the wire rope. When the wire rope leaves the purge chamber, the mud is blown clean and the wire rope is basically in a dry state.

Claims

1. A cleaning device for a wireline coring drill, characterized in that: The cleaning device is installed on the top of the drill pipe and is provided with a purge chamber (7) and a high-pressure gas chamber (5). The high-pressure gas chamber is sleeved on the outside of the purge chamber, and a closed annular cavity is formed between the high-pressure gas chamber and the purge chamber. A high-pressure gas inlet (6) connected to a high-pressure gas pipe is provided on the outer wall of the high-pressure gas chamber. A nozzle (8) is provided on the outer wall of the purge chamber corresponding to the high-pressure gas chamber along the circumferential direction. A purge chamber top cover (4) is fixed on the top of the purge chamber, and a wire rope hole is provided in the middle of the purge chamber top cover. A buffer chamber (3) is provided at the top of the purge chamber, a buffer chamber cover (2) is fixed on the top of the buffer chamber, and a wire rope hole is provided in the middle of the buffer chamber cover; The purge chamber top cover and the buffer chamber top cover are both formed into a circle by several fan-shaped rubber plates. The diameter of the wire rope hole of the purge chamber top cover and the buffer chamber top cover is 1-3 mm larger than the outer diameter of the wire rope. The purge chamber is provided with a mud overflow port (11), and the mud overflow port is located at the lower part of the high-pressure air chamber; The bottom of the purge chamber is fixedly connected to a drill rod mounting sleeve (13), a drill rod sleeve (12) is nested in the drill rod mounting sleeve, and a plurality of fastening bolts (14) are radially arranged at the lower portion of the mounting sleeve, the fastening bolts passing through the mounting sleeve wall to lock the drill rod.

2. The coring wire rope cleaning device for a wireline coring drill according to claim 1, characterized in that: The outer wall nozzles of the high-pressure air chamber are arranged in at least two rows, with 12-16 nozzles evenly distributed in each row.

3. The coring wire rope cleaning device for a wireline coring drill according to claim 1, characterized in that: A connecting plate (10) is welded to the outer wall of the purge chamber, the connecting plate is bolted to the high-pressure gas chamber, and a sealing ring (9) is provided between the connecting plate and the high-pressure gas chamber.

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