Safety trip device for fracturing string

Abstract

The invention relates to a safety trip device for a fracturing string. The upper portion of an inner suspending pipe is milled into strip bodies, the strip bodies are suspended on a suspending circular bead in an outer suspending pipe, an upper seal ring, a middle seal ring and a lower seal ring are installed on a lock sleeve, the lock sleeve is sleeved with a spring, the lock sleeve is installed into the outer suspending pipe, and the outer wall of the lock sleeve stops that milled strip bodies on the upper portion of the inner suspending pipe; the lower portion of an upper connector is connected with the upper portion of the outer suspending pipe, a kerf is formed in the upper portion of the lock sleeve, a part of the kerf is installed into the upper connector, and the outer suspending pipe is connected through a lock pin; the upper seal ring is located above the spring, the middle seal ring is located between the spring and the lock pin, the lower portion of the lock sleeve is inserted into the inner suspending pipe, the gap between the lock sleeve and the inner suspending pipe is sealed by the lower seal ring, and the lower seal ring is located below the milled strip bodies on the upper portion of the inner suspending pipe; a communicating groove is formed in the inner suspending pipe, a sliding sleeve upper seal ring and a sliding sleeve lower seal ring are installed on a sliding sleeve, and the sliding sleeve covers the communicating groove in the inner suspending pipe and is fixed by a sliding sleeve shear pin.

Description

technical field [0001] The invention relates to a tool used on a fracturing construction pipe string in an oil field, which is used for safely detaching the pipe string from a fracturing tool after the fracturing pipe string is stuck, in particular to a safety detachment device for the fracturing pipe string. Background technique [0002] During oil field fracturing construction, the fracturing proppant must be injected from the fracturing tool. The proppant is generally a special granular sand. The cracked pipe string was disengaged, and the fracturing pipe string could not be lifted out of the well, making it impossible to carry out the next workover and put into production. After such an accident, the current method is generally to break the pipe string and then salvage it in sections. This method has many steps, complicated construction, long workover time, high workover cost, and oil and water wells cannot be put into production in time, resulting in major damage Econo...

AI Technical Summary

Problems solved by technology

[0002] During oil field fracturing construction, the fracturing proppant should be injected from the fracturing tool. The proppant is usually special granular sand. The cracked string is disengaged, and the fracturing string cannot be lifted out of the well, making it impossible to carry out the next workover and put into production

After such an accident, the current method is generally to break the pipe string and then salvage it in sections. This method has many steps, complicated construction, long workover time, high workover cost, and oil and water wells cannot be put into production in time, resulting in major damage Economic losses

In order to avoid the above-mentioned accidents, the oil field has adopted technical measures for upper and lower safety joints of fracturing tools. However, due to the influence of materials and operations, the reliability of the safety joints is poor, and it is easy to be cut off on the way down the well, resulting in the failure of the trip.

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