CN-224200601-U - Drill bit replacing device suitable for well drilling

CN224200601UCN 224200601 UCN224200601 UCN 224200601UCN-224200601-U

Abstract

The utility model provides a drill bit replacing device suitable for drilling, which comprises a drill rod body, wherein a centering sleeve block is fixedly arranged in the drill rod body, a centering rod is fixedly arranged at the top of the drill rod body, the centering sleeve block is sleeved on the centering rod, the centering sleeve block can drive the centering rod to synchronously rotate, a centering plate is fixedly arranged on the peripheral surface of the centering rod, a clamping and fixing mechanism comprises at least two curved clamping rods, movable extrusion modules and a driving source, the at least two curved clamping rods are arranged at intervals along the circumferential direction of the drill rod body, the middle part of each curved clamping rod is hinged to the inner wall of the drill rod body, the upper end of each curved clamping rod is in contact with the movable extrusion module, the lower end of each curved clamping rod is in contact with the bottom surface of the corresponding centering plate, the driving source can drive the movable extrusion module to move up and down, and the lower end of each curved clamping rod can be pushed up or moved down away from the corresponding plate based on the up-down movement of the movable extrusion module. The problem of in prior art dismouting inconvenient between drill bit and the drilling rod is solved.

Inventors

YANG ZUXU
CAO RONG
Sang Jingnan
LIU XU

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司上海海洋油气分公司

Dates

Publication Date: 20260505
Application Date: 20250610

Claims (10)

1. A drill bit changing apparatus adapted for use in drilling a well, comprising: The drill rod comprises a drill rod body, wherein a centering sleeve block is fixedly arranged in the drill rod body; The drill bit comprises a drill bit body, wherein a centering rod is fixedly arranged at the top of the drill bit body, the centering sleeve block is sleeved on the centering rod, and the centering sleeve block can drive the centering rod to synchronously rotate; The clamping and fixing mechanism is arranged inside the drill rod body and comprises at least two curved clamping rods, a movable extrusion module and a driving source, the at least two curved clamping rods are arranged at intervals along the circumferential direction of the drill rod body, the middle of each curved clamping rod is hinged to the inner wall of the drill rod body, the upper end of each curved clamping rod is in contact with the movable extrusion module, the lower end of each curved clamping rod is in contact with the bottom surface of the corresponding joint plate, the driving source can drive the movable extrusion module to move up and down, and the lower end of each curved clamping rod can be pushed upwards to the corresponding joint plate or can be moved downwards to be away from the corresponding joint plate based on the up-down movement of the movable extrusion module.
2. The bit changing device for drilling according to claim 1, wherein the movable extrusion module comprises a movable sleeve block, an extrusion ring, an internal thread pipe and a driving screw, wherein the movable sleeve block is sleeved on the centering sleeve block, the centering sleeve block can limit the movable sleeve block to rotate relative to the movable sleeve block, the extrusion ring is fixedly arranged on the peripheral surface of the movable sleeve block, the extrusion ring is in contact with the upper end of the curved clamping rod, the internal thread pipe is fixedly arranged on the top of the movable sleeve block, the first end of the driving screw is rotationally connected to the top of the centering sleeve block, the second end of the driving screw extends upwards to penetrate through the movable sleeve block to be in threaded connection with the internal thread pipe and is in transmission connection with the driving source, and the driving source is used for driving the driving screw to rotate.
3. A bit changing apparatus for well drilling according to claim 2, wherein the outer diameter of the squeeze ring increases gradually from top to bottom.
4. The bit changing device for well drilling according to claim 2, wherein the shape of the centering sleeve block is square, and the movable sleeve block is provided with square holes which are matched with the shape of the centering sleeve block.
5. The bit changing apparatus for well drilling according to claim 1, wherein the centering rod is square, and the centering sleeve block is provided with a square hole adapted to the centering rod.
6. The bit changing apparatus for well drilling according to claim 1, wherein the curved clamping rod comprises a first rod section and a second rod section, a set included angle is formed between the first rod section and the second rod section, and a joint of the first rod section and the second rod section is hinged with an inner wall of the drill rod body.
7. The bit change apparatus of claim 6, wherein the angle between the first and second pole segments is 120 ° to 150 °.
8. The bit changing device for drilling according to claim 1, wherein a sealing assembly is arranged at the joint of the drill rod body and the drill bit body, the sealing assembly comprises an annular sealing seat fixedly connected to the top of the drill bit body, a sealing groove and a sealing ring, the sealing groove is formed in the bottom of the drill rod body, the annular sealing seat is clamped in the sealing groove, and the sealing ring is clamped between the annular sealing seat and the sealing groove.
9. The bit changing apparatus for well drilling according to claim 1, wherein a positioning mechanism is further provided inside the drill rod body, and the positioning mechanism is capable of positioning the drill rod body to prevent the drill rod body from moving relative to the drill rod body.
10. The bit changing device for drilling according to claim 9, wherein the positioning mechanism comprises a fixed cylinder, a movable rod, a clamping head and a spring, wherein the fixed cylinder is fixedly connected to the inner wall of the drill rod body, the movable rod is movably connected to the inside of the fixed cylinder, the first end of the movable rod extends to the outside of the fixed cylinder, the clamping head is fixedly connected to the first end of the movable rod, the spring is sleeved on the movable rod, one end of the spring is in contact with the clamping head, the other end of the spring is in contact with the fixed cylinder, a positioning block protruding to the side face is arranged on the side face of the abutting plate, the upper surface and the lower surface of the positioning block are inclined planes, and the upper surface and the lower surface of the clamping head are inclined planes.

Description

Drill bit replacing device suitable for well drilling Technical Field The utility model relates to the technical field of marine drilling equipment, in particular to a drill bit replacing device suitable for drilling. Background The marine drilling technology is a drilling operation technology for carrying out resource investigation and development of petroleum, natural gas and the like in a marine area, is a high-end technology, needs to deal with severe marine environments and high-pressure and high-temperature stratum, and therefore has high overall cost, wherein a drill bit belongs to one of important parts in the drilling operation, a drill rod is driven by a power source, and then the drill rod drives the drill bit to carry out the drilling operation. The drill bit can be corroded and worn in the operation, so that the drill bit needs to be replaced regularly to ensure the normal drilling operation, the drill bit part is fixedly connected with the drill rod in a common threaded connection mode, the drill bit is connected with the drill rod in a threaded and clamping groove combined mode in general, namely, a butted threaded column is arranged on the drill bit, and then a butted internal threaded area is arranged on the drill rod, so that the drill bit is tightly attached to the drill rod to achieve tightness when the threads are screwed tightly, and the connection mode is stable but inconvenient to detach. Therefore, how to provide a bit changing device for marine drilling is a problem that needs to be solved by those skilled in the art. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a bit changing device for drilling, which is used for solving the problem of inconvenient assembly and disassembly between a bit and a drill rod in the prior art. The utility model provides a drill bit replacing device suitable for drilling, which comprises a drill rod body, wherein a centering sleeve block is fixedly arranged in the drill rod body, a centering rod is fixedly arranged at the top of the drill rod body, the centering sleeve block is sleeved on the centering rod, the centering sleeve block can drive the centering rod to synchronously rotate, an abutting plate is fixedly arranged on the peripheral surface of the centering rod, a clamping and fixing mechanism is arranged in the drill rod body, the clamping and fixing mechanism comprises at least two curved clamping rods, a movable extrusion module and a driving source, the at least two curved clamping rods are arranged at intervals along the circumferential direction of the drill rod body, the middle part of each curved clamping rod is hinged to the inner wall of the drill rod body, the upper end of each curved clamping rod is contacted with the movable extrusion module, the lower end of each curved clamping rod is contacted with the bottom surface of the corresponding abutting plate, the driving source can drive the movable extrusion module to move up and down, and the curved clamping rods can move up and down based on the movable extrusion module to enable the curved clamping rods to move down to be far away from the lower ends of the abutting plates. Further, the movable extrusion module comprises a movable sleeve block, an extrusion ring, an internal thread pipe and a driving screw, wherein the movable sleeve block is sleeved on the centering sleeve block, the centering sleeve block can limit the movable sleeve block to rotate relative to the movable sleeve block, the extrusion ring is fixedly arranged on the peripheral surface of the movable sleeve block, the extrusion ring is in contact with the upper end of the curved clamping rod, the internal thread pipe is fixedly arranged at the top of the movable sleeve block, the first end of the driving screw is rotationally connected to the top of the centering sleeve block, the second end of the driving screw upwards extends through the movable sleeve block and is in threaded connection with the internal thread pipe and is in transmission connection with a driving source, and the driving source is used for driving the driving screw to rotate. Further, the outer diameter of the extrusion ring gradually increases from top to bottom. Further, the appearance of the centering sleeve block is square, and square holes matched with the appearance of the centering sleeve block are formed in the movable sleeve block. Further, the centering rod is square, and square holes matched with the centering rod are formed in the centering sleeve block. Further, the curved clamping rod comprises a first rod section and a second rod section, a set included angle is formed between the first rod section and the second rod section, and the joint of the first rod section and the second rod section is hinged with the inner wall of the drill rod body. Further, an included angle between the first rod section and the second rod section is 120-150 degree