CN105201439A - Device and method for salvaging drill bit for broken drill rod in pile foundation hole - Google Patents

Abstract

The invention provides a device and method for salvaging a drill bit for a broken drill rod in a pile foundation hole. The device and the method are used for salvaging a falling drill bit. The falling drill bit is connected with a drill bit drill rod and a drill rod joint. The device for salvaging the drill bit for the broken drill rod in the pile foundation hole comprises a connecting drill rod and a salvager claw connected on the connecting drill rod. The invention also provides a method for salvaging the drill bit for the broken drill rod in the pile foundation hole, which adopts the device for salvaging the drill bit for the broken drill rod in the pile foundation hole. According to the invention, a drilling machine for construction is connected with the device for salvaging to realize salvage of the drill bit, and other lifting devices are not needed. The salvaging efficiency is higher, the operation is simpler and more convenient, and the device and the method can be suitable for salvaging the drill bit with any degree of inclination of the drill rod.

Description

Drill bit fishing device and fishing method for broken drill pipe in pile foundation hole

technical field

The invention relates to the field of bored pile drilling construction, in particular to a drill bit fishing device and a fishing method for a broken drill pipe in a pile foundation hole.

Background technique

During the drilling process of bored piles, the drill bit and the drill pipe will occasionally be separated, and the drill pipe will break and the drill bit will fall to the bottom of the hole. The drill bit and the drill pipe are all made of steel, and the drill bit must be salvaged in time and quickly. However, due to the narrow drilling space, it is very troublesome to salvage the drill bit.

To sum up, the following problems exist in the prior art: when the drill pipe breaks and the drill bit falls off to the bottom of the hole, it is very troublesome to salvage the drill bit.

Contents of the invention

The invention provides a drill bit fishing device and a fishing method for a broken drill pipe in a pile foundation hole to solve the problem that the drill bit is not easy to fish when the drill pipe is broken and the drill bit falls off to the bottom of the hole.

For this reason, the present invention proposes a drill bit fishing device for a broken drill pipe in a pile foundation hole, which is used to salvage a dropped drill bit. A drill bit drill pipe and a drill pipe joint are connected to the dropped drill bit. The drill bit fishing device for drill pipe includes:

connecting drill pipe;

an overshot claw connected to the connecting drill pipe;

The overshot claw includes: a connecting part connected to the outer side of the connecting drill rod;

an inner arc-shaped hook connected to the connecting part, and the inner arc-shaped hook protrudes outward from the outer edge of the connecting part relative to the axis of the connecting drill rod;

an outer arc-shaped hook, located outside the inner arc-shaped hook and bent from the connecting portion to the inner arc-shaped hook, an annular space is formed between the outer arc-shaped hook and the inner arc-shaped hook;

The annular space includes: an arc-shaped opening section, and a semicircular card slot connected with the arc-shaped opening section;

The annular space gradually narrows from the arc-shaped opening section to the semicircular slot, the width of the opening of the arc-shaped opening section is greater than the diameter of the drill rod, and the diameter of the semi-circular slot is equal to the diameter of the drill bit. The diameter of the rod; the semicircular slot is tangent to the inner arc hook and forms an S shape, and the semicircular slot is tangent to the outer arc hook to form a continuous smooth curve.

Further, the connection part, the outer arc-shaped hook and the inner arc-shaped hook are in the same plane.

Further, the plane where the outer arc-shaped hook and the inner arc-shaped hook are located is perpendicular to the connecting drill rod.

Further, the connecting portion is circular.

Further, the diameter of the drill pipe joint is larger than the diameter of the drill pipe of the drill bit.

Further, the connecting drill rod is connected with the drilling rod of the drilling machine.

Further, the ends of the outer arc-shaped hook and the inner arc-shaped hook are respectively connected to the semicircular locking groove.

The present invention also proposes a drill bit fishing method for a broken drill pipe in a pile foundation hole, which adopts the aforementioned drill bit fishing device for a broken drill pipe in a pile foundation hole, and the drill bit fishing method includes:

Step A: connecting the connecting drill pipe of the drill bit fishing device with the drilling drill pipe of the drilling rig;

Step B: Then install the drill pipe of the drilling rig joint by joint, and lower the drill bit fishing device to the position where the drill bit falls;

Step C: then start the drilling rig to make the overshot claw rotate slowly in the pile foundation hole;

Step D: When the front end of the outer arc-shaped hook of the overshot claw is hooked to the dropped drill pipe, the drill pipe will slide into the semicircle slot along the arc-shaped opening to straighten the fallen drill pipe ;

Step E: Then the overshot jaw is lifted by the drilling rig, and the semicircle groove will slide along the outer wall of the dropped drill bit;

Step F: When the semicircle groove slides to the drill pipe joint, the drill pipe joint will prevent the semicircle groove from sliding, thereby completing the effective connection between the overshot claw and the drill pipe, and realizing the fishing of the dropped drill bit.

During the drilling process of bored piles, the drill bit and the drill pipe will occasionally be separated, and the drill pipe will break and the drill bit will fall to the bottom of the hole. The drill bit and the drill pipe are all made of steel, and the drill bit must be salvaged in time and quickly. However, due to the narrow drilling space, it is very troublesome to salvage the drill bit. But according to prior art, drilling rod breaks at that position, the in-hole state after drill bit comes off, the inclination angle of drilling rod etc. all can't be predicted.

The invention connects the connecting drill pipe of the drill bit fishing device with the drilling drill pipe of the drilling rig, and then installs the drill pipe of the drilling rig one by one, and lowers the fishing device to the position where the drill bit drops; by starting the drilling rig, the fishing claws rotate slowly in the hole, When the front end of the outer arc-shaped hook of the overshot claw is hooked to the drill pipe that has fallen from the drilling rig, the drill pipe will slide into the semicircular slot along the arc-shaped opening to straighten the drill pipe that has fallen from the drill bit; and then pass through the drilling rig Lift the overshot claw, and the semicircle slot will slide along the outer wall of the drill pipe of the dropped drill bit. Since the diameter of the drill pipe joint of the dropped drill bit is larger than that of the drill pipe, when the semicircle slot slides to the drill pipe joint, the drill pipe joint will It will prevent the semicircular slot from sliding, thereby completing the effective connection between the overshot claw and the drill bit, and realizing the purpose of fishing the dropped drill bit.

Description of drawings

Fig. 1 is the schematic diagram of the front view structure of the drill bit fishing device for the broken drill pipe in the pile foundation hole according to the embodiment of the present invention;

Fig. 2 is the bottom-view structural schematic view of the drill bit fishing device for the broken drill pipe in the pile foundation hole according to the embodiment of the present invention;

Fig. 3 is a working principle diagram of a drill bit fishing device for a broken drill pipe in a pile foundation hole according to an embodiment of the present invention.

Explanation of reference numbers:

1 connecting drill pipe 3 overshot claw 5 drill bit drill pipe

30 connection part 31 inner arc hook 32 outer arc hook 33 annular space

331 semicircle card slot 332 arc opening section 3320 opening 321 front end of external arc hook

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.

As shown in Figures 1 and 2, the drill bit fishing device for a broken drill pipe in a pile foundation hole according to an embodiment of the present invention includes:

Connect the drill pipe 1;

The overshot claw 3 is connected to the connecting drill pipe 1;

The overshot jaw 3 includes: a connecting portion 30 connected to the outside of the connecting drill pipe 1;

An inner arc-shaped hook 31 is connected to the connecting portion 30, and the inner arc-shaped hook 31 protrudes outward from the outer edge of the connecting portion 30 relative to the axis or center of the connecting drill rod 1, so that the drill bit After the drill rod 5 is straightened or dropped, it can block the drill rod 5 to prevent the drill rod 5 from coming out of the semicircular slot 331;

The outer arc-shaped hook 32 is used to hook the drill bit drill rod 5, and is located outside the inner arc-shaped hook 31 and bends from the connecting portion 30 to the inner arc-shaped hook 31. The outer arc-shaped hook 32 is connected to the inner arc-shaped hook 31. An annular space 33 is formed between the inner arc-shaped hooks 31;

As shown in Figure 1, the annular space 33 includes: an arc-shaped opening section 332, and a semi-circular locking groove 331 connected with the arc-shaped opening section; the head end of the arc-shaped opening section is an opening 3320, and the arc-shaped opening section The tail end of the shaped opening section 332 is connected to the semicircle slot 331, the opening 3320 is located at the head end of the annular space 33, and the semicircle slot 331 closes the tail end of the annular space;

The width (for example, the minimum width) of the opening 3320 of the arc-shaped opening section is greater than the diameter of the drill rod, and the annular space 33 gradually narrows from the arc-shaped opening section 332 to the semicircular groove 331 (or in other words , the width of the annular space 33 gradually narrows from the arc-shaped opening section 332 to the semicircular groove 331), so that the drill bit drill rod can enter the annular space from the opening 3320, and can be gradually guided or righted along the annular space;

The diameter of described semicircle draw-in groove 331 is equal to the diameter of described drill bit drill rod 5, so that finally blocks drill bit drill rod 5, and semicircle draw-in groove 331 can form the contact of semicircular arc surface with drill bit drill rod 5, like this , when lifting the drill rod 5 downhole, it can not slip, so that the overshot claw 3 exerts sufficient power on the drill rod 5, so as to adapt to the complex situation of downhole fishing; The inner arc-shaped hook 31 is tangent to form an S shape, and the tangent point is point a, and the semicircular clamping groove 331 is tangent to the outer arc-shaped hook 32, and the tangent point is point b, and forms a continuous smooth curve, For example, it is an involute or a spiral line, and the line ab connecting point a and point b is the diameter line of the semicircular locking groove 331 . In the smooth curve formed by the semicircle draw-in slot 331 and the external arc-shaped hook 32, the angle between the tangent at the front end 321 of the external arc-shaped hook and the tangent of the semi-circle draw-in slot 331 at point a is 45° to 135°, for example 90 degrees, so that the drill bit and drill pipe have enough room for adjustment and rotation during the process of righting.

Further, the connecting part 30, the outer arc-shaped hook 32 and the inner arc-shaped hook 31 are in the same plane, which is convenient for manufacturing, and convenient for righting and locking.

Further, the plane where the outer arc-shaped hook 32 and the inner arc-shaped hook 31 are located is perpendicular to the connecting drill rod 1 , so as to facilitate rotation with the connecting drill rod 1 .

Further, the connecting part 30 is circular, which is convenient for connecting with the external arc-shaped hook 32 and the internal arc-shaped hook 31, and facilitates the manufacture of the external arc-shaped hook 32 and the internal arc-shaped hook 31 . Taking the axis (or circle center) of the connecting drill pipe 1 as the center, the radius of the inner arc-shaped hook 31 is greater than the radius of the connecting portion 30 , and the radius of the outer arc-shaped hook 32 is greater than the radius of the outer arc-shaped hook 32 .

Further, the diameter of the drill pipe joint 5 is larger than that of the drill bit, so that when the semicircle slot slides to the drill joint, the drill joint will prevent the semicircle slot from sliding.

Further, the connecting drill rod 1 is connected with the drilling rod of the drilling rig so as to obtain the rotational moment without driving by other external devices.

Further, the ends of the outer arc-shaped hook and the inner arc-shaped hook are respectively connected with the semicircular slots to form an annular space with an open head end and a closed tail end.

As shown in Figure 3, the present invention also proposes a drill bit fishing method for a broken drill pipe in a pile foundation hole, which adopts the aforementioned drill bit fishing device for a broken drill pipe in a pile foundation hole, and the drill bit fishing method includes:

Step A: connecting the connecting drill pipe of the drill bit fishing device with the drilling drill pipe of the drilling rig;

Step B: Then install the drill pipe of the drilling rig joint by joint, and lower the drill bit fishing device to the position where the drill bit falls;

Step C: then start the drilling rig to make the overshot claw rotate slowly in the pile foundation hole;

Step D: When the front end of the outer arc-shaped hook of the overshot claw is hooked to the dropped drilling rig drill rod, the drill drill rod will slide into the semicircle draw-in groove along the arc-shaped opening section, and the dropped drill drill rod 5 righting;

Step E: Then the overshot jaw is lifted by the drilling rig, and the semicircle groove will slide along the outer wall of the dropped drill bit;

Step F: When the semicircle groove slides to the drill pipe joint, the drill pipe joint will prevent the semicircle groove from sliding, thereby completing the effective connection between the overshot claw and the drill pipe, and realizing the fishing of the dropped drill bit.

No matter what state the drill bit is in, the present invention can quickly and accurately hook the drill pipe, make the drill pipe enter the slot according to the predetermined track, realize the correction of the drill pipe; and ensure the effective connection between the slot and the drill bit; realize accurate and fast , Efficient salvage drill bit. And existing technology has following shortcoming:

After the drill bit falls off, when there is a situation that the drill pipe is in contact with the hole wall, the flexible lasso structure used to entangle the drill bit cannot realize the salvage of the drill bit.

The success rate of fishing for drill bits with a large inclination is not high, and it is necessary to accurately measure the specific conditions of the falling drill pipes, and it takes a long time. The fishing process requires the cooperation of other lifting equipment.

The invention realizes drilling bit salvage by connecting a construction drilling rig with a fishing device, without providing other hoisting equipment; the fishing efficiency is higher, the operation is simpler, and it is applicable to the fishing of drill bits with any inclination of the drill pipe.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Because the various components of the present invention can be combined with each other under the condition of no conflict, any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall belong to the protection of the present invention. range.

Claims (8)

1. A drill bit fishing device for a broken drill pipe in a pile foundation hole, used to salvage a dropped drill bit, the dropped drill bit is connected with a drill bit drill pipe and a drill pipe joint, it is characterized in that the broken drill pipe in the pile foundation hole The drill bit fishing device for drill pipe includes: connecting drill pipe; an overshot claw connected to the connecting drill pipe; The overshot claw includes: a connecting part connected to the outer side of the connecting drill rod; an inner arc-shaped hook connected to the connecting part, and the inner arc-shaped hook protrudes outward from the outer edge of the connecting part relative to the axis of the connecting drill rod; an outer arc-shaped hook, located outside the inner arc-shaped hook and bent from the connecting portion to the inner arc-shaped hook, an annular space is formed between the outer arc-shaped hook and the inner arc-shaped hook; The annular space includes: an arc-shaped opening section, and a semicircular card slot connected with the arc-shaped opening section; The annular space gradually narrows from the arc-shaped opening section to the semicircular slot, the width of the opening of the arc-shaped opening section is greater than the diameter of the drill rod, and the diameter of the semi-circular slot is equal to the diameter of the drill bit. The diameter of the rod; the semicircular slot is tangent to the inner arc hook and forms an S shape, and the semicircular slot is tangent to the outer arc hook to form a continuous smooth curve. 2 . The drill bit fishing device for a broken drill pipe in a pile foundation hole according to claim 1 , wherein the connecting portion, the outer arc-shaped hook and the inner arc-shaped hook are in the same plane. 3 . 3 . The drill bit fishing device for a broken drill pipe in a pile foundation hole according to claim 1 , wherein the plane where the outer arc-shaped hook and the inner arc-shaped hook are located is perpendicular to the connecting drill pipe. 4 . 4 . The drill bit fishing device for a broken drill pipe in a pile foundation hole according to claim 1 , wherein the connecting portion is in an annular shape. 5 . 5. The drill bit fishing device for a broken drill pipe in a pile foundation hole according to claim 1, wherein the diameter of the drill pipe joint is larger than the diameter of the drill pipe. 6 . The drill bit fishing device for a broken drill pipe in a pile foundation hole according to claim 1 , wherein the connecting drill pipe is connected with a drilling drill pipe of a drilling machine. 7 . 7 . The drill bit fishing device for a broken drill pipe in a pile foundation hole according to claim 1 , wherein the ends of the outer arc-shaped hook and the inner arc-shaped hook are respectively connected to the semicircular locking groove. 8 . 8. A drill bit fishing method for broken drill pipes in pile foundation holes, characterized in that, the drill bit fishing device for broken drill pipes in pile foundation holes as claimed in claim 1, said drill bit fishing method comprising: Step A: connecting the connecting drill pipe of the drill bit fishing device with the drilling drill pipe of the drilling rig; Step B: Then install the drill pipe of the drilling rig joint by joint, and lower the drill bit fishing device to the position where the drill bit falls; Step C: then start the drilling rig to make the overshot claw rotate slowly in the pile foundation hole; Step D: When the front end of the outer arc-shaped hook of the overshot claw is hooked to the dropped drill pipe, the drill pipe will slide into the semicircle slot along the arc-shaped opening to straighten the fallen drill pipe ; Step E: Then the overshot jaw is lifted by the drilling rig, and the semicircle groove will slide along the outer wall of the dropped drill bit; Step F: When the semicircle groove slides to the drill pipe joint, the drill pipe joint will prevent the semicircle groove from sliding, thereby completing the effective connection between the overshot claw and the drill pipe, and realizing the fishing of the dropped drill bit.