DE380993C - Device for pulling the cover out of the line of an oil source - Google Patents

Description

GERMAN EMPIRE

ISSUED SEPTEMBER 14, 1923

REICH'S PATENT OFFICE

PATENT LETTERING

CLASS 5 a GROUP 4

(M. η 8899 Vl fs a)

McCormick Drilling Tool Company of Detroit, V.St.A.

Device for pulling the casing out of the pipeline of an oil well.

Patented in the German Empire on September 8, 1922.

The invention relates to a device for pulling out the panel running an oil well.

According to the invention, pawls or similar parts are to be avoided. On one

Mandrel, which has conical parts, tapered parts and shoulders formed thereby, are slidable seats and expandable jaws, the inside also conical parts, protruding Parts with a smaller inner diameter

have knives and shoulders that are in the upper position of the cheeks on the shoulders rest of the cathedral. The jaws are held together at the top and bottom by ring-shaped springs, wherein the expansion of the jaws is limited by adjustable rings surrounding the jaws. At the bottom of the Domes a lifting head is provided on which | Removable rings sit to keep movement ίο limit the jaws downwards, which movement is generated by the fact that the ' Thorn in its rapid movement towards the un-; ten suddenly comes to a standstill.

Fig. R is a view of the device in the conduit. j

Fig. 2 is '· with some parts removed and others shown in section and the jaws are in' are a view of the device of the upper layer.

Fig. 3 is a view of the device | similar to Fig. 2, in which the Bak- j are in the lower gripping position.

Fig. 4 is a cross-section along 4-4 of Fig. 2.

Fig. 5 is a section along 5-5 of Fig. 3. J Fig. 6 is a section along 6-6 of Fig Fig. 2.

Fig. 7 is a view of the ring surrounding the jaws and the extent of the same, ben limited. j

Fig. 8 is a view of a ring that ^: Limits downward movement of the jaws.

A mandrel 12 is located on a shaft 10, j which conical parts 3, 14, 15 and tapered! Has parts 16, 17, 18, making shoulders 19 develop. At the lower part of the dome, a lifting head 20 is provided, which initially lying mandrel part a shoulder 21 bil-. det. The expansion members 25, also called sliding plates or jaws, have a toothed one Outer surface 26, which consists of two parts ■ in which the teeth face opposite Run direction. Four such jaws are provided. The inward ones Parts 19 'of the jaws work together with the shoulders 19 of the dome and the Inner walls 28 are conical.

The ring 30 consists of a number of elements 31 and is called a control ring because it limits the size of the expansion. ; A number of resilient resilient rings 32 I surround the jaws below the ring 30 to draw them together. <

Rings 35 are provided above the shoulder 21 of the lifting head 20 to allow the movement the jaws 25 to limit downward and a number of resilient rings 36 surrounds the Jaws just below the serrated outer surface, around the lower part of the jaws to contract. The same mandrel is used for cables of different sizes and the The size of the expansion is determined by adjusting the ring 30 and the number of rings 35 set.

The device is lowered into the pipe and about 3 m above the Dropped on the floor, so that the jaws 25 slide over the mandrel and expand. The ring that is in the upper layer is the upper one Part of the jaw loosely surrounds it, firmly enclosing the same at 39 to prevent incision of the To prevent jaws in the casing, and the conical parts 13,14,15 are in engagement with the protruding parts 19 'of the jaws.

After the casing has been lifted, the mandrel is driven downwards so that the The jaws assume their original position in relation to the mandrel, passing them through them surrounding spring washers are pressed against the mandrel.

Claims (3)

Patent claims: 1. Device for pulling the casing out of the pipeline of an oil well, characterized in that on a mandrel (12), the conical parts (13, 14,15) .. tapered parts (16, 17, 18) and thereby formed shoulders (19), slidable and expandable jaws sit which have internally conical parts, protruding parts (19 ') and shoulders which in the upper position rest on the shoulders (19) of the dome and above and below are held together by annular springs (32, 36). 2. Device according to claim i, characterized in that an adjustable ring (3o) surrounds the jaws to limit the expansion of the same. 3. Apparatus according to claim 1, characterized in that the mandrel at his lower end has a lifting head (20) on whose shoulders (21) removable Rings (35) sit to prevent the jaws from moving down when stopped suddenly of the dome in its downward movement. · 1 sheet of drawings.