Timing automatic clamping device for oil pipe under pump

Abstract

The invention relates to a timing automatic clamping device for an oil pipe under a pump. According to the technical scheme, a slip groove is formed in a cone; the inclination of the slip groove is equal to that of the upper portions of the slips; the upper portions of the slips are mounted in the slip groove in the cone, and thus the slips cannot be separated from the cone within a certain movingrange; the lower portions of the slips are connected into a hanging groove in the upper portion of a slip bracket in a hanging mode; an inner pipe penetrates through the slips and the upper portion of the slip bracket to be connected with the cone; the slip bracket is connected onto the inner pipe through a self melting connecting nail; a spring is mounted on the inner pipe in a sleeving mode; the upper end surface of the spring abuts against the slip bracket; and a spring seat is connected to the inner pipe and compresses the spring, and thus the compression force of the spring acts on the slip bracket. The timing automatic clamping device has the beneficial effects that the oil pipe can be automatically anchored to a sleeve, the situation that an oil pipe column falls down into the bottom of a well after separation is prevented, the salvage workload caused when the oil pipe falls into the bottom of the well is reduced, and the economic benefits are remarkable.

Description

technical field [0001] The invention relates to a downhole anchoring tool for an oil production well in an oil field, in particular to a timing automatic clamping device for an oil pipe under a pump. Background technique [0002] In the process of oil production, there are often accidents where the tubing breaks off and falls into the bottom of the well. Since the tubing is connected to various downhole tools, and some downhole tools have large dimensions, it is very difficult to fish the tubing into the well, and the operating cost Increased height, and sometimes the salvage is unsuccessful, so that the oil well is scrapped, causing huge economic losses. In order to prevent the oil pipe from falling into the bottom of the well after breaking off, some devices have been designed to prevent the oil pipe from falling into the bottom of the well after breaking off. For example, the Chinese patent number is 01203266.2, and the patent name is "oil pipe falling prevention device"....

AI Technical Summary

Problems solved by technology

When the breaking point is lower, the falling speed is not high, and throttling cannot occur, so the above-mentioned patent cannot operate, and also cannot prevent the tubing from falling into the well.

The above two patented technologies are only able to act after the tubing string falls off to prevent the tubing string below the drop point from falling into the bottom of the well, and cannot prevent the tubing string from falling off

Another example is Chinese patent 200410039801.5 "Tube Anchor". Its working process requires hydraulic pressure. It can only be lowered on the pump, and can only anchor the oil pipe on the pump, and cannot prevent the oil pipe and tools from falling into the well under the pump.

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