Sand prevention clamp sand spraying device and its use method

Abstract

The invention provides a sand-jam preventive sand spraying device, comprising a sand spraying pipe, a lower central pipe and a lower joint, wherein the outer wall of the lower central pipe is provided with an upper leather cup cover, a piston ring and a lower leather cup cover from top to bottom; the upper leather cup cover is fixed on the outer wall of the lower central pipe through a pin; the piston ring is communicated with a hydraulic pipeline inside the sand-jam preventive sand spraying device, and can move upward along the wall of the lower central pipe under hydraulic action; the outer edge of the upper leather cup cover extends downward to form a blocking part; the outer edge of the lower leather cup cover extends upward to form a positioning groove; a leather cup made of elastic materials is folded in the blocking part and the positioning groove; and the free shape of the leather cup is of a horn shape with a big upper mouth and a small lower mouth. When a great number of sand piles up on the leather cup, the leather cup separates from the positioning groove under the action of sand gravity, friction, etc., so as to eliminate sand jam, and then a pipe column can be directly lifted out.

Description

technical field [0001] The invention relates to the technical field of oil field downhole tools, in particular to a multi-layer layered fracturing pipe string for preventing sand stuck and a method for preventing sand stuck. Background technique [0002] In order to increase the production of oil and gas wells in oil field development, it is often necessary to modify the fracturing process. For multi-layer oil and gas wells, layer-by-layer fracturing is often used to improve single-well production. The layered fracturing stimulation process needs to be implemented through layered fracturing strings. [0003] At present, the layered fracturing strings used in oilfields vary according to the process requirements and the supporting tools used on the string. The supporting tools used on the string mainly include packers, hydraulic anchors, sand blasters, etc. Among them, according to the different sand blasters, it can be divided into two types: fixed type and disengagement ty...

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a sand blaster for preventing sand jams and its use method, so as to solve the problem of lifting the tubing string due to sand jams after the existing layered fracturing strings are operated in layers. When the load is too large or even completely stuck and unable to be pulled out, it uses the anti-sand blaster connected between the packers to complete the functions of sand injection fracturing, sand retention and sand removal and jam release, and plays a trip to the string The purpose of completing multi-layer fracturing and pulling out the pipe string smoothly

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