Drilling tool capable of replacing drill bit without lifting drill and with high expanding and converging success rate

A technology of success rate and drill bit replacement, which is applied in the direction of drill bits, earthwork drilling, drilling equipment, etc., to achieve the effect of flexible aiming and small fillet radius

Pending Publication Date: 2022-05-13
INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The drilling tool with the above structure without drilling and changing the drill bit is currently used at a maximum well depth of 2,200 meters, and the success rate of its expansion and convergence is only about 80%

Method used

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  • Drilling tool capable of replacing drill bit without lifting drill and with high expanding and converging success rate
  • Drilling tool capable of replacing drill bit without lifting drill and with high expanding and converging success rate
  • Drilling tool capable of replacing drill bit without lifting drill and with high expanding and converging success rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Prior art 1: The Chinese utility model of CN85200563U discloses the position tension type without lifting the drill to replace the drill bit. Both the aiming mechanism and the suspension mechanism of the tool are based on the arrow-shaped spline pair 18. On the one hand, when the main drilling tool 1 enters the auxiliary drilling tool 2, the outer arrow-shaped splines of the drill bit holder 10 and the inner arrow-shaped splines of the positioning end pipe 15 are automatically aligned so that the auxiliary drill bit 11 is aligned with the drill bit holder 10; on the other hand, during suspension, the suspension joint 9 is suspended on the arrow portion of the arrow-shaped spline in the positioning end pipe 15, which is a point suspension structure.

[0050] The drilling tool without changing the drill bit provided in this embodiment and the drilling tool without changing the drill bit in the prior art both include a main drilling tool 1 and an auxiliary drilling tool 2 ...

Embodiment 2

[0064] This embodiment is further optimized on the basis of the above embodiments, such as image 3 , Figure 12 As shown, a drain eye 8 is also arranged on the suspension joint 9 .

[0065] Generally, there is water in the drill pipe in the hole. When the main drilling tool 1 is put into operation, the gap between the outer diameter of the main drilling tool 1 and the inner diameter of the drill pipe is very small, usually 1mm~2mm. Down, similar to a piston movement. Therefore, in prior art 1 and prior art 2, the descending speed of the main drilling tool 1 is relatively slow, generally about 15 minutes is required for a hole depth of 800 m. If the water discharge eye is added on the suspension joint 9 of the main drilling tool 1, the water passing area will be increased by 47%, and the main drilling tool 1 of the depth of the hole of 800m only needs about 10 minutes to descend.

[0066] Therefore, adding the drain hole 8 on the suspension joint 9 can increase the deliver...

Embodiment 3

[0069] This embodiment is further optimized on the basis of the above embodiments, and a strip-shaped powder discharge channel 4 is added to the outer cylindrical surface of the positioning end pipe 15 .

[0070] In this embodiment, the drilling tool does not mention drilling and changing the drill bit. The same as the prior art 1 and the prior art 2, the main drill bit 19 and the secondary drill bit 11 are used to crush the rock. The sudden change in the cross section of the pipe 15 is likely to cause accumulation of rock powder, resulting in repeated crushing, which seriously affects the drilling efficiency and greatly reduces the life of the auxiliary drill bit 11. Therefore, in this embodiment, by adding a strip-shaped powder discharge channel 4 on the outer cylinder of the auxiliary drill bit 11, the powder discharge channel of the auxiliary drill bit 11 is increased to reduce repeated crushing, which can increase the life of the auxiliary drill bit 11 and improve the ROP....

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Abstract

The invention relates to the technical field of drilling tools without lifting a drill bit and replacing the drill bit, and particularly discloses a drilling tool without lifting the drill bit and replacing the drill bit with a high tension convergence rate. The upper outer pipe is connected with the positioning end pipe; an annular gap is formed between the outer cylindrical surface of the suspension joint and the inner cylindrical surface of the upper outer pipe; the lower end face of the suspension joint is in contact with the upper end face of the positioning end pipe, so that an end face sealing mechanism for plane sealing is formed, and a suspension mechanism for surface suspension is also formed; and an arrow-shaped spline pair consisting of an outer arrow-shaped spline of the drill bit frame and an inner arrow-shaped spline of the positioning end pipe forms an aiming mechanism. Point suspension is changed into surface suspension, so that the suspension area is increased, and the suspension is firmer; the aiming mechanism is more flexible and reliable; and the overall expanding and converging success rate is increased to 90% or above.

Description

technical field [0001] The invention relates to the technical field of drilling machinery, in particular to a drill tool with a high success rate of tension and tightening without lifting the drill bit. Background technique [0002] Existing do not mention drilling to change the drill bit at present, the technology is comparatively mature is the reaming tension type not to mention the drill to change the drill bit. The reaming and tensioning type non-lifting drilling tool adopts the main drill bit and the auxiliary drill bit to break rock, and is usually used in conjunction with a wireline drill pipe, a wireline winch and a wireline overhauler for core drilling. [0003] An existing reaming and retracting drilling tool without lifting the drill bit includes the main drilling tool as the salvage part and the auxiliary drilling tool as the non-fishing part. The auxiliary drilling tool only includes the positioning end pipe, the upper outer pipe and the sealing Ring, main dril...

Claims

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Application Information

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IPC IPC(8): E21B10/64
CPCE21B10/64
Inventor 邓梦春钱锋胡立林下斌
Owner INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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