JPS5931609B2 - Cylinder capture mechanism of underground investigation cylinder lifting device in drilling well - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical body capturing mechanism of a device for lifting cylindrical bodies inserted into the ground in a drilling well, and allows cylindrical bodies of different inner diameters to be easily lifted out while maintaining internal space. The aim is to eliminate any biasing means such as springs so that it can be used stably over a long period of time.

In drilling work, in order to prevent the wall from collapsing, the casing pipe is driven in while drilling, and after installing the water intake screen (strainer) in the specified position, the casing pipe is pulled out to the required length (sometimes the casing pipe is pulled out to the required length). .

This construction method is called the pull bank method or the cased hole method.

In addition, even if the pull bank method is not used, a large diameter protection pipe (conductor or sleeve pipe) should be inserted in the area close to the ground surface to protect the hole wall and as a muddy water reservoir, and after the drilling work is completed, the same pipe should be removed. Withdraw.

In addition, there are cases in which the entire length of the pipe inside the tank valve or a pipe installed at an arbitrary position is pulled up.

The present invention can be applied to any of these cases, and the cylindrical body to be lifted out does not need to be machined with a flange on the ground or screws on its inner and outer circumferences, unlike conventional methods, and the engagement between the slip and the cylindrical body is eliminated. Also, since the power of the lifting device is used, there is no need for a separate power source.

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 is a lifting frame whose upper part is connected to a suitable lifting device.

At the lower end of this rod 1 is a wedge body 3 having a conical surface portion 2 on the upper surface.
will be established.

4 is a sleeve that loosely fits into the elevating frame 1, and can be freely raised and lowered by means of a hanging rope 6 connected to the link 5, etc.

Reference numeral 1 denotes a rocking arm which is radially pivotally connected to the outer peripheral surface of the sleeve 4 by a bearing 8 and a shaft 9, and a slip 11 is pivotally connected to the lower end of the rocking arm by a shaft 10.

This slip 11 can be freely engaged with and disengaged from the conical surface 2 of the wedge body 3 on its inner surface, and has teeth 13 on its outer surface to engage with the inner wall surface of the cylindrical body 12.

As shown in FIG. 2, the inner surface of this slip 11 is recessed at the center to form a plurality of line contacts with the conical surface section 2, and the tooth section 13 is connected to the conical surface section 2 with the slope thereof being connected to the cylinder body 12.
It is preferable that the tooth portion 13 is set so as to engage with the inner wall surface over its entire length, and that the curvature at the tooth portion 13 is smaller than that of the cylindrical body 12.

In addition, in the drawing, 21 is a busosig fitted into the wedge body 3, and 22
is a liner attached to the inner surface of the slip 11, both of which are intended to accommodate large changes in the inner diameter of the cylindrical body 12.

23 is a socket for mounting the wedge body 3.

In the illustrated mechanism, a wedge body 3 suitable for the inner diameter of the cylinder body 12 is attached to the elevating frame 1 by a NAND 23, and the wedge body 3 is lowered to a predetermined position within the cylinder body 12 by an elevating device.

Further, the sleeve 4 is loosely fitted onto the rod 1 and lowered by the hanging rope 6.

Of course, the sleeve 4 may be lowered in alignment with the wedge body 3.

When the lifting frame 1 is pulled up, the conical surface portion 2 of the wedge body 3 comes into contact with the inner surface of the slip 11, and gradually expels the slip 11 outwards by one line (1 row).

When the two are closely joined together, the slip 11 moves in parallel due to the rocking movement on the shafts 10 and 9, and the toothed portion 13 on the outer surface comes into tight engagement with the inner wall surface of the cylinder 12.

When the wedge body 3 is further pulled up, the cylinder body 12 that has been bitten by the teeth 13 of the slip 11 finally begins to be lifted up.

To pull out the cylinder 12 to the ground, just pull up the wedge body 3 by that distance, or if you want to stop halfway, lower the wedge body 3 at that point, pull up the sleeve 4, and remove the slip 1.
1 away from the cylinder body 12, and the wedge body 3 and sleeve 4 are separated from the cylinder body 12.
Just pull it out.

According to the present invention, since the cylinder is lifted by engaging the slip and the cylinder by lifting the wedge, no separate power is required, and the cylinder and the part after the cylinder is lifted can be moved into space. It is suitable for use in wells due to its ability to maintain its cylindrical shape, does not require any processing, and eliminates any biasing means such as springs.
It can be used stably for a long period of time even under harsh working conditions, the cylinder can be pulled out with an extremely simple operation, and even if the cylinder internal diameter changes slightly, it can be automatically adjusted by the rocking arm. .

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view illustrating an embodiment of the capturing mechanism according to the present invention, and FIG. 2 is a plan view thereof. 1... Elevating frame, 2... One conical surface part, 3...
... Cuneiform body, 4 ... Sleeve, 1 ... Singing arm, 11 ... Slip, 12 ... ... Cylindrical body,
13...-Tooth section.

Claims (1)

[Claims] 1. A wedge body having a conical surface portion on the upper surface is provided at the lower end of the lifting frame, and a rocking arm is radially pivoted on the outer peripheral surface of a sleeve that is loosely fitted into this rod and is movable relative to this rod. A slip that can be freely engaged and detached from the conical surface of the wedge is connected to the free end of the wedge on the inner surface.
The outer surface of this slip is provided with a toothed portion that engages with the inner wall surface of the cylinder, and when the inner surface of the slip engages with the conical surface portion by lifting the wedge, the slip is moved outward according to the inner diameter of the cylinder via the rocking arm. A cylindrical body capturing mechanism of an underground insertion cylindrical body lifting device for a drilling well, characterized in that the cylindrical body is moved in a half direction so that its teeth are closely engaged with the inner wall surface of the cylindrical body.