Blind Loop Isolation Tool

Abstract

The invention discloses a blind plate type circulating packing tool. The blind plate type circulating packing tool comprises a blind plate type circulating short section component located on the upper portion and a sealing short section component located at the lower portion, and the blind plate type circulating short section component is integrally connected with the sealing short section component through connecting pipes, and the outer walls of the blind plate type circulating short section component and the sealing short section component is sleeved with the connecting pipes; and a sand washing tubular column is connected to a sealed well opening through an upper connecting pipe, and the sand washing tubular column is connected to the upper part of sand face through the upper end of a lower connecting head. Sand washing medium is injected from a well opening, after passing annulus of the sand washing tubular column at the upper end of the blind plate type circulating packing tool and an isolating tubular column, due to the function of the sealing short section component, the medium can enter the sand washing tubular column only through a circulating hole of the blind plate type circulating short section component due to the packing function of a blind plate, the sand washing medium can only go downward and is sprayed out from a sand washing head finally, after passing the annulus of the isolating tubular column and a well completing tubular column, the sand washing medium returns from the well opening, continuous constructing without pump stop for connecting a drilling rod of the sand washing tubular column is realized accordingly.

Description

technical field [0001] The invention relates to the sand flushing technology of coal bed gas wells, in particular to a blind plate type circulation isolation tool. Background technique [0002] At present, domestic coalbed methane wells are mostly completed with casing or screen pipes. During the mining process, coal ash enters the wellbore along with the coalbed methane and gradually accumulates, affecting gas production. Regular sand washing is required. The existing domestic sand washing technologies mainly include coiled tubing sand washing technology and conventional tubing sand washing technology. [0003] Coiled tubing is used for sand washing, the cost of equipment is high, and good economic benefits cannot be achieved, while for conventional oil tubing for sand washing, the sand washing medium is injected through the wellhead tubing, and the pump needs to be stopped for single connection, and the sand washing process is discontinuous. At this time, the pulverized co...

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Problems solved by technology

[0003] Coiled tubing is used for sand washing, the cost of equipment is high, and good economic benefits cannot be achieved, while for conventional oil tubing for sand washing, the sand washing medium is injected through the wellhead tubing, and the pump needs to be stopped for single connection, and the sand washing process is discontinuous. At this time, the pulverized coal Falling back, prone to the risk of sand jams

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