SU939721A1 - Mechanism for feeding deep-well threaded fishing tool - Google Patents

Description

() MECHANISM OF FEEDING WELL CARRIAGE

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This invention relates to a fishing tool for extracting remaining drill pipes in a well.

A known mechanism for feeding a threaded catcher, comprising a housing with a coaxially mounted rod and pistons and a feeding unit for the catcher with a device for fixing the housing.

The disadvantage of this mechanism is the complexity of the catcher feed unit.

Closer to the proposed by the achieved result is the mechanism of the threads of the threaded catcher, comprising a housing, coaxially mounted - is the stem with sealing elements, the limiting sleeve and the sub 2.

A disadvantage of this device is the difficulty in adjusting the feed of a 2 ° ltel and the absence of a safety mechanism to prevent the tool from twisting or breaking.

The purpose of the invention is to increase the reliability and efficiency of fishing operations by ensuring the uniform feeding of the catcher.

The goal is achieved by the fact that the feed mechanism is equipped with a movable telescopic sub mounted on the lower end of the rod and a feed spring placed on the rod between the movable sub and the limiting sleeve, while the working stroke of the feed spring is not less than the length of the recoverable part. pipes.

In addition, the feed mechanism is equipped with an adjustable safety clutch, the maximum response force of which is no more than the twisting force of the threaded catcher.

Figure 1 shows the mechanism section; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1; in fig. - lock, general view.

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The feed mechanism includes a housing 1 spindle 2, a movable telescopic sub 3, a rod C, an adjustable safety clutch 5, an nut, a clamp nut 6, a lock nut 7, a calibrated spring 8, a safety clutch 5, a calibrated feed spring 9, a limiting sleeve 10, a sub 11 , pins 12, sealing elements 13, nut l4 of stem A. In the spindle 2 and the safety coupling 5, the hexagonal holes A and B are made to fix the spindle 2 and the coupling 5 by a lock.

The device works as follows.

The feed mechanism is connected to the drill pipes by means of the sub 11, and a tap or bell is screwed into the mobile telescopic sub 3 and lowered onto the bottom as far as it will go into the fishing pipe with unloading to kN. Making sure that the thread catcher is in the pipe (on the pipe), the column is lifted until its weight is restored. The feed spring 9 is in this state in a compressed state. To connect the delicating tool with the emergency column, its uniform supply is provided by the feed spring 9 and the rotor rotation, and the stroke of the feed spring 9 is equal to or greater than the cut part of the recoverable pipe. The magnitude of the torque is controlled on the surface of the tightening adjustable safety clutch 5 by the spring 8 and the pressure nut 6, and the maximum force of the clutch 5 is equal to or less than the twisting force of the threaded catcher.

An adjustable safety coupling 5 prevents the tool from breaking. The actuation of the safety clutch 5 serves as a signal of the complete fixation of the fishing tool. Next, lift the emergency column.

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If necessary, unscrew the tap with a force exceeding the torque to which the coupling 5i is adjusted. The hex lock is dropped into the column, which locks the spindle 2 and the safety coupling 5. In this case, the torque is transmitted from the drill string directly to the housing 1 of the mechanism, mine safety clutch 5.

The application of the proposed mechanism will reduce the time for carrying out fishing operations and well repair.

Claims (2)

1. Bore threaded feed mechanism, catcher, comprising a housing, coaxially mounted stem with sealing elements, a limiting bushing and a sub, about and with, in order to increase the reliability and efficiency of fishing operations by ensuring uniform feeding the catcher is equipped with a movable telescopic sub mounted on the lower end of the rod and a feed spring placed on the rod between the sub and the limiting bushing, while the length of the power stroke of the feed spring n e less than the length of the cut part of the extracted pipe 2. Pop. 1 mechanism, which is also distinguished by the fact that it is equipped with an adjustable safety clutch, the maximum response force of which is no more than the twisting force of the threaded catcher. Sources of information taken into account in the examination 1. US patent number 23772 9, cl.166-98, published .. 2. Temporary instructions for the operation of the downhole bit feeder. Mo, VNIIBT, 19b9 (prototype).