CN109736733B - Expansion pipe feeding device - Google Patents

Abstract

An expansion pipe lowering device includes a pipe cleaner, an outer pipe joint, a one-way valve, a center pipe joint, an outer pipe, a center pipe, an expansion pipe joint, an anti-rotation pin and a cutter; the upper end of the pipe cleaner is connected to a drill pipe, and the lower end of the pipe cleaner is connected to the outer pipe joint; the lower end of the outer pipe joint is connected to the outer pipe through an outer thread; the lower end of the outer pipe is connected to a cutter with a blade through an outer thread; the interior of the lower end of the outer pipe is connected to the expansion pipe joint, and an anti-rotation pin is installed between the expansion pipe joint and the outer pipe; a one-way valve is installed inside the outer pipe joint; the lower end of the one-way valve in the outer pipe joint is connected to the center pipe joint; the lower end of the center pipe joint is connected to the center pipe; the lower end of the center pipe extends into the inner cavity of the expansion pipe joint, and a sealing ring is installed on the outer circle of the center pipe. The present invention integrates multiple functions of connecting the expansion pipe, establishing a pressure passage, cleaning the pipe, and cutting the head and tail of the expansion pipe; it greatly reduces the number of drilling and shortening the construction period.

Description

An expansion pipe running device

Technical Field

The invention relates to the technical field of geological drilling, in particular to an expansion pipe running device.

Background Art

The final section of a geological core drilling hole is generally an open hole. During the drilling process of the final section, complex strata are often encountered, resulting in collapse, caves, leakage, and diameter reduction, which make it impossible to continue drilling. Conventional wall protection methods are casing or mud wall protection, but if conventional casing is inserted into the final section, the final hole diameter will inevitably be reduced, affecting the coring results. Therefore, only mud wall protection can be performed in the final section, but the mud wall protection effect is unstable, and accidents may occur again under repeated knocking of the drill rod. The expansion pipe wall protection can stably protect the accident section without reducing the through hole diameter, and is a new technology for handling geological core drilling accidents.

Summary of the invention

The technical problem to be solved by the present invention is to provide an expansion pipe lowering device which can be connected to the drill pipe and the expansion pipe at the same time to establish a pressure passage and a through pipe, thereby reducing the number of trips and drills and shortening the wall protection time.

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

A device for lowering an expansion pipe comprises a pipe cleaner, an outer pipe joint, a one-way valve, a central pipe joint, an outer pipe, a central pipe, an expansion pipe joint, an anti-rotation pin and a cutter; the pipe cleaner is a hollow tubular structure, the upper end of which is processed with an outer thread for connecting a drill pipe, and the lower end of the pipe cleaner is connected to the outer pipe joint of the hollow tubular structure through an inner thread; the lower end of the outer pipe joint is connected to the outer pipe through an outer thread; the lower end of the outer pipe is connected to a tubular cutter through an outer thread; blades are arranged at intervals at the lower end of the cutter in the circumferential direction; the inner part of the lower end of the outer pipe is threaded with an inner thread A tubular expansion pipe joint extending out of the lower end of the cutting knife is connected, and anti-rotation pins are evenly installed on the side wall between the expansion pipe joint and the outer pipe in the circumferential direction; a one-way valve is installed inside the outer pipe joint to ensure the one-way flow of liquid from the pipe clearer to the expansion pipe joint; the lower end of the one-way valve in the outer pipe joint is connected to the hollow center pipe joint extending out of the lower end of the outer pipe joint through an inner thread; the lower end of the center pipe joint is connected to the hollow center pipe through an inner thread; the lower end of the center pipe extends into the inner cavity of the expansion pipe joint, and a sealing ring is installed between the outer circle of the center pipe and the inner cavity of the expansion pipe joint.

The above expansion pipe running device is further improved in that: the upper end of the pipe cleaner is processed to match the tapered outer buckle for connecting the drill pipe; the lower end of the pipe cleaner is processed to match the tapered inner buckle for connecting the external pipe joint, and the upper end of the external pipe joint is processed to match the tapered inner buckle of the pipe cleaner.

The above expansion pipe running device is further improved in that: the outer diameter of the pipe cleaner is equal to the diameter of the hole to be protected; the outer circle of the pipe cleaner is evenly distributed with several rows of alloy or PDC composite sheets along the circumferential direction; and a long groove for reducing friction is provided between every two evenly distributed rows of alloy or PDC composite sheets.

The above expansion pipe lowering device is further improved in that: the interior of the outer pipe joint is a two-level stepped through hole with a smaller upper part and a larger lower part, a one-way valve is installed at the middle diameter of the two-level stepped through holes, and the large diameter of the stepped through hole is connected to the central pipe joint through a straight inner buckle, and the upper end of the central pipe joint resists and limits the one-way valve.

The above-mentioned expansion pipe running device is further improved in that: the center pipe is a tubular structure with large diameters at both ends and a small diameter in the middle section, the upper large end of the center pipe is connected to the lower end of the center pipe joint through a straight external buckle, the lower large end of the center pipe is inserted into the expansion pipe joint, and a sealing groove is provided on the outer cylindrical surface of the lower large end of the center pipe, and a sealing ring is installed in the sealing groove.

The above expansion pipe running device is further improved in that: the blade of the cutter is a diamond blade, which is embedded in a pre-processed cutter barrel of the cutter and fixed by welding.

The above expansion pipe running device is further improved in that: the outer pipe is processed with a through hole for installing the anti-rotation pin, the expansion pipe joint is processed with a blind hole for installing the anti-rotation pin, and the anti-rotation pin radially passes through the through hole of the outer pipe and extends into the blind hole of the expansion pipe joint.

After adopting the above technical solution, the present invention has the following technical improvement effects:

The present invention can run the expansion pipe once and then carry out the operations of pressure testing, head cutting, pipe clearing, tail removal and drill lifting, and simultaneously integrates the functions of connecting the expansion pipe, establishing the pressure testing passage, pipe clearing and cutting the head and tail of the expansion pipe; the number of drilling times is greatly reduced, the construction period is shortened, and the probability of new accidents occurring during the accident handling process is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a front view of the present invention in a lowered state;

Fig. 2 is a view taken along the line A-A of Fig. 1;

FIG3 is a schematic diagram of a pipe cutting state of the present invention;

Fig. 4 is a front view of the cutting knife;

Fig. 5 is a B-B view of Fig. 4;

FIG. 6 is a bottom view of FIG. 4 .

The reference numerals in the figure represent: 1. pipe cleaner; 2. outer pipe joint; 3. non-return valve; 4. center pipe joint; 5. outer pipe; 6. center pipe; 7. expansion pipe joint; 8. anti-rotation pin; 9. cutting knife.

DETAILED DESCRIPTION

The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

The expansion pipe running device of the present invention is shown in Figures 1 to 3, and includes a pipe cleaner 1, an outer pipe joint 2, a one-way valve 3, a center pipe joint 4, an outer pipe 5, a center pipe 6, an expansion pipe joint 7, an anti-rotation pin 8 and a cutter 9.

The upper end of the pipe cleaner 1 is processed with an external thread for connecting the drill pipe. The lower end of the pipe cleaner 1 is processed with an internal thread, and the external pipe joint 2 is connected through the internal thread. The lower end of the external pipe joint 2 is connected to the outer pipe 5 through the external thread. The lower end of the outer pipe 5 is connected to the tubular cutter 9 through the external thread, and the blades are arranged at intervals along the circumferential direction at the lower end of the cutter 9. The inside of the lower end of the outer pipe 5 is connected to the expansion pipe joint 7 through the internal thread, and the expansion pipe joint 7 is sleeved on the inner circle of the cutter 9 and extends out of the lower end of the cutter 9. The lower end of the expansion pipe joint 7 is welded to the expansion pipe. The side wall between the expansion pipe joint 7 and the outer pipe 5 is evenly installed with anti-rotation pins 8 along the circumferential direction to prevent the inner thread at the lower end of the outer pipe 5 from being disengaged from the expansion pipe joint 7 when the drill pipe rotates forward or reversely.

A one-way valve 3 is installed inside the outer pipe joint 2, and the one-way valve 3 can ensure that the flow direction of the liquid can only flow from the pipe cleaner 1 to the expansion pipe joint 7, but cannot flow from the expansion pipe joint 7 to the pipe cleaner 1. The lower end of the one-way valve 3 in the outer pipe joint 2 is connected to the center pipe joint 4 through an internal thread. The center pipe joint 4 extends out of the lower end of the outer pipe joint 2, and the lower end of the center pipe joint 4 is connected to the center pipe 6 through an internal thread. The lower end of the center pipe 6 extends into the inner cavity of the expansion pipe joint 7, and a sealing ring is installed between the outer circle of the center pipe 6 and the inner cavity of the expansion pipe joint 7. The sealing ring can prevent the liquid pressure of the expansion pipe from leaking through the gap between the center pipe 6 and the expansion pipe joint 7.

The pipe clearer 1 is a hollow tubular structure, one end of which is a conical outer buckle, connected to the drill rod, and the expansion tube is sent to the designated position by lowering the drill rod. The other end of the pipe clearer 1 is a conical inner buckle, connected to the outer pipe joint 2. The outer diameter of the pipe clearer 1 is equal to the aperture of the hole to be protected, and a number of rows of alloys or PDC composite sheets are evenly distributed in the circumferential direction of the outer circle to prevent the wear of the hole wall on the pipe clearer 1 during the lowering process. Long grooves are milled between every two evenly distributed rows of alloys to reduce the friction during the lowering process. A through hole is opened from top to bottom in the center of the pipe clearer 1. Chamfers are set at the upper and lower ends of the pipe clearer 1 to facilitate lowering and lifting.

The outer pipe joint 2 is a hollow tubular structure, and the upper end of the outer pipe joint 2 is a tapered outer buckle, which is connected to the tapered inner buckle at the lower end of the pipe cleaner 1. The outer circle of the lower end of the outer pipe joint 2 is a straight outer buckle, which is connected to the outer pipe 5. The inner circle of the lower end of the outer pipe joint 2 is a straight inner buckle, which is connected to the center pipe joint 4. The center hole of the outer pipe joint 2 is stepped, with the largest diameter at the straight inner buckle, a one-way valve 3 placed at the middle diameter, and the smallest diameter being the liquid flow hole; after the one-way valve 3 is placed in place, the center pipe joint 4 is connected to the straight inner buckle at the lower end of the outer pipe joint 2, and after being screwed to the bottom, it supports the one-way valve 3 to prevent the one-way valve 3 from moving.

The upper end of the central pipe joint 4 is connected to the lower end of the outer pipe joint 2 through an outer thread, and the lower end of the central pipe joint 4 is connected to the central pipe 6 through an inner thread. The center of the central pipe joint 4 is a through hole, which is a liquid flow hole.

The outer tube 5 is a tubular structure, and the upper end is connected to the outer tube joint 2 through an inner thread. The lower end of the outer tube 5 is connected to the cutter 9 through an outer thread, and is connected to the expansion pipe joint 7 through an inner thread, and the inner thread has no upper and lower shoulder limit. At the place where the outer tube 5 and the expansion pipe joint 7 overlap, four holes are evenly drilled in the circumferential direction below the connecting thread, and anti-rotation pins 8 are driven into the holes. Rotating the drill rod can drive the outer tube 5 to rotate downward, cut off the anti-rotation pin 8, and then the outer tube 5 rotates with the rotation of the drill rod, disengages from the thread of the expansion pipe joint 7, and continues to rotate downward, and the cutter 9 can be used to cut the head and tail.

The central tube 6 is a tubular structure with larger diameters at both ends and smaller diameters in the middle. The upper end of the central tube 6 is connected to the lower end of the central tube joint 4 through an external thread, and the lower end of the central tube 6 is inserted into the expansion tube joint 7 and can slide inside the expansion tube joint 7. A sealing groove is provided on the outer circumferential surface of the lower end of the central tube 6, and a sealing ring is built in. The sealing ring is used to prevent the liquid pressure in the expansion tube from being released through the gap between the central tube 6 and its contact surface. A through hole is provided inside the central tube 6 for liquid circulation.

The expansion pipe joint 7 is a tubular structure, the upper end of which is connected to the outer tube 5 through an external thread, and below the external thread is a pin hole for installing an anti-rotation pin drilled with the outer tube 5, and the pin hole is not drilled through to prevent pressure release, and the lower end of the expansion pipe joint 7 is inserted into the expansion tube and connected by welding. A through hole is provided in the center of the expansion pipe joint 7, and the lower end of the center tube 6 slides inside it.

As shown in Figures 4 to 6, the cutter 9 is a tubular structure, the upper end of which is connected to the outer tube 5 by an internal thread, and the lower end is a diamond blade evenly arranged at a certain interval in the circumferential direction. The diamond blade is embedded in the cutter barrel of the cutter 9 and fixed by welding.

As shown in FIG2 , the bottom of the expansion pipe joint 7 is below the cutter in the lowered state. In the pipe cutting state, as shown in FIG3 , the drill pipe drives the pipe cleaner 1, the outer pipe joint 2, the one-way valve 3, the center pipe joint 4, the outer pipe 5, the center pipe 6 and the cutter 9 to move downward. At this time, the anti-rotation pin 8 has been cut off, and the expansion pipe joint 7 is fixed. The cutter 9 can move to the bottom of the expansion pipe joint 7. At this time, the cutter 9 has touched the expansion pipe, and the head can be cut by pressurizing and rotating.

The present invention has a pipe cleaner at the upper end connected to a drill pipe, and an expansion pipe joint at the lower end connected to an expansion pipe, and the lowering device and the expansion pipe connected thereto are lowered to a designated position through the drill pipe. After lowering to the designated position, high-pressure liquid is injected into the drill pipe, and the high-pressure liquid flows into the expansion pipe after passing through the pipe cleaner, the outer pipe joint, the center pipe joint, the center pipe and the expansion pipe joint of the lowering device. In order to prevent the liquid in the expansion pipe from flowing back when the pressure in the pipe is greater than the external pressure, a one-way valve is built into the outer pipe joint of the lowering device, which can ensure that the high-pressure liquid can only flow into the expansion pipe and cannot flow in the opposite direction. After the expansion tube is expanded and hung in place, the drill pipe is rotated downward, and the drill pipe drives the pipe cleaner, outer pipe joint and outer pipe of the running tool to rotate, and the rotation torque is increased to cut the anti-rotation pin; the rotation continues to descend, and the lower end of the outer pipe is separated from the thread of the expansion tube joint, and the expansion tube joint is fixed. The drill pipe rotates and presses downward, and then drives the pipe cleaner, outer pipe joint, outer pipe, cutter, one-way valve, center pipe joint and center pipe to rotate and descend together until the cutter contacts the expansion tube, and the drilling pressure is increased to cut off the head of the expansion tube; after cutting off the head, the downward rotation drilling is continued. At this time, the inside of the expansion tube has expanded. If there is no obstruction to the pipe cleaner during the downward process, it proves that the internal diameter of the expansion tube has met the requirements and no later rounding is required; when the cutter cannot continue to descend, it proves that it has contacted the tail of the expansion tube. At this time, the drilling pressure is increased to cut off the tail of the bellows. After the tail is cut off, the running tool is lifted out, and the cut-off head of the expansion tube is lifted out of the hole together.

Claims (2)

1. An expansion pipe lowering device, characterized in that it comprises a pipe cleaner (1), an outer pipe joint (2), a one-way valve (3), a center pipe joint (4), an outer pipe (5), a center pipe (6), an expansion pipe joint (7), an anti-rotation pin (8) and a cutter (9); the pipe cleaner (1) is a hollow tubular structure, the upper end of the pipe cleaner (1) is processed with an outer thread for connecting to a drill pipe, and the lower end of the pipe cleaner (1) is connected to the outer pipe joint (2) of the hollow tubular structure through an inner thread; the lower end of the outer pipe joint (2) is connected to the outer pipe (5) through an outer thread; the lower end of the outer pipe (5) is connected to a tubular cutter (9) through an outer thread; the lower end of the cutter (9) is provided with blades at intervals along the circumferential direction; the lower end of the outer pipe (5) The tubular expansion pipe joint (7) extending out of the lower end of the cutting knife (9) is connected inside by an internal thread, and anti-rotation pins (8) are evenly installed on the side wall between the expansion pipe joint (7) and the outer pipe (5) along the circumferential direction; a one-way valve (3) is installed inside the outer pipe joint (2) to ensure that the liquid flows in one direction from the pipe cleaner (1) to the expansion pipe joint (7); the lower end of the one-way valve inside the outer pipe joint (2) is connected to the hollow center pipe joint (4) extending out of the lower end of the outer pipe joint by an internal thread; the lower end of the center pipe joint (4) is connected to the hollow center pipe (6) by an internal thread; the lower end of the center pipe (6) extends into the inner cavity of the expansion pipe joint (7), and a sealing ring is installed between the outer circle of the center pipe (6) and the inner cavity of the expansion pipe joint (7); The upper end of the pipe cleaner (1) is processed with a tapered outer buckle for matching with the drill pipe; the lower end of the pipe cleaner (1) is processed with a tapered inner buckle for matching with the outer pipe joint (2); the upper end of the outer pipe joint (2) is processed with a tapered outer buckle matching with the tapered inner buckle of the pipe cleaner; The outer diameter of the pipe cleaner (1) is equal to the diameter of the hole to be protected; The central tube (6) is a tubular structure with large diameters at both ends and a small diameter in the middle. The upper large end of the central tube (6) is connected to the lower end of the central tube joint (4) through a straight outer buckle. The lower large end of the central tube (6) is inserted into the expansion tube joint (7). The outer circumferential surface of the lower large end of the central tube (6) is provided with a sealing groove, and the sealing ring is installed in the sealing groove. 2. An expansion pipe running device according to claim 1, characterized in that: the outer pipe (5) is processed with a through hole for installing the anti-rotation pin (8), and the expansion pipe joint (7) is processed with a blind hole for installing the anti-rotation pin (8), and the anti-rotation pin (8) radially passes through the through hole of the outer pipe (5) and extends into the blind hole of the expansion pipe joint (7).