Bridge plug capable of washing sand

Abstract

The invention discloses a bridge plug capable of washing sand, and belongs to the technical field of oilfield exploitation. The bridge plug capable of washing the sand comprises an upper connector, anupper central pipe, an intermediate central pipe and a lower central pipe, wherein the upper connector, the upper central pipe, the intermediate central pipe and the lower central pipe are sequentially connected from top to bottom in a threaded mode; a ball seat is connected to the inner side of the lower end of the lower central pipe in a threaded mode, an insertion pipe is connected to the lower end of the ball seat in a threaded mode, and a self-locking head is arranged at the lower end of the insertion pipe; a switch slide sleeve is arranged in a switch connector, a positioning self-locking switch is arranged at the upper end of the switch slide sleeve, and first sand-washing channels are arranged on the switch slide sleeve and an intermediate connector correspondingly; and a sand-washing outer sleeve is connected to the outer part of the intermediate connector in a threaded mode, an inclined-port guide shoe is connected to the lower end of the sand-washing outer sleeve in a threaded mode, and a second sand-washing channel is arranged in the inclined-port guide shoe. On the whole, the bridge plug capable of washing the sand realizes sealing of a stratum through a pipe column,and no special sand-washing tool is required to be lowered; two-stage of pistons and three sets of rubber barrel structures are adopted in the bridge plug, setting is reliable, and the success rate ishigh; and the switch slide sleeve is reliable in sealing, can withstand two-way pressure difference and has high pressure bearing, the working procedure is simplified, the construction cost rate is improved, and the operation risk is reduced.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to a sand flushable bridge plug. Background technique [0002] With the development of oilfields, most domestic oilfields have entered the middle and late stages of oilfield development. Sand production in oil and water wells has become a common phenomenon, and sand production is becoming more and more serious. As a result, conventional sand washing operations cannot completely wash away the sand, and when construction operations are carried out The tool still cannot be lowered into place, causing the pipe string to be stuck, which poses a great construction risk to the construction work. The existing conventional sand washing operation is mainly to run a special sand washing pipe string for sand washing operation. After the sand washing is completed, the bridge plug is lowered to seal the target layer. This operation process has a long construction period and high op...

AI Technical Summary

Problems solved by technology

[0002] With the development of oilfields, most domestic oilfields have entered the middle and late stages of oilfield development. Sand production in oil and water wells has become a common phenomenon, and sand production is becoming more and more serious. As a result, conventional sand washing operations cannot completely wash away the sand, and when construction operations are carried out The tool still cannot be lowered into place, causing the pipe string to be stuck, which poses a great construction risk to the construction work

The existing conventional sand washing operation is mainly to run a special sand washing pipe string for sand washing operation. After the sand washing is completed, the bridge plug is lowered to seal the target layer. This operation process has a long construction period and high operation risk. Suitable for wells with severe sand production

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