Rotational flow sand washing process pipe column

Abstract

The embodiment of the invention discloses a sand washing pipe column and a sand washing method, the sand washing pipe column comprises a liquid flow reverser and a cyclone, and the lower end of the liquid flow reverser is connected with the cyclone. A descending channel for sand washing liquid to pass through and an ascending channel for returned liquid to pass through are formed in the liquid flow reverser. The upper part of the descending channel is communicated with an external space through a first opening in the side surface of the liquid flow reverser, and the lower part of the descending channel is communicated with a flow channel in the cyclone. An opening is formed in the lower part of the ascending channel. The cyclone is configured to convert the sand washing liquid flowing outof the descending channel from linear flow into rotational flow. The liquid flow reverser further comprises a blocking device, and the blocking device is located on the outer side of the sand washingpipe column and arranged to divide an annular space between sleeves into which the sand washing pipe column descends into an upper space and a lower space. The upper space is communicated with the descending channel.

Description

technical field [0001] This article relates to but not limited to a process pipe string, especially relates to but not limited to a cyclone sand washing process pipe string. Background technique [0002] In the process of oil field production, the problem of sand production in the formation is often encountered. The sand production is extremely harmful, and the sand buries the oil layer or the sand plugging of the wellbore causes the oil well to stop production. In this case, the most commonly used solution is to use the sand washing fluid to circulate and wash out the sand in the wellbore to restore the normal production of the oil well. Commonly used sand washing methods are as follows: [0003] 1) Conventional sand washing: The sand washing fluid is circulated at high speed through the pipe string to circulate the sand in the wellbore back to the ground. 2) Nitrogen foam sand washing: It is the same as conventional sand washing, except that nitrogen is added to the sand...

AI Technical Summary

Problems solved by technology

The problem is that the vector nozzle is fixed on the vector flushing tube and forms a certain angle with the axis of the vector flushing tube. When the sand washing fluid passes through the vector nozzle, it can only form a jet flow at a certain angle on the vector flushing tube instead of a swirling flow. The sand washing fluid sprayed by different vector nozzles interferes with each other to form turbulent flow

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