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Two-tube reverse circulation continuous sand flushing device

A double-pipe back-flushing and sand-flushing technology, which is used in flushing wellbore, wellbore/well components, earth-moving drilling, etc. Effect

Inactive Publication Date: 2010-01-27
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a double-pipe reverse circulation continuous sand washing device. This device solves the problem in the prior art that it can only continuously wash sand in conventional single-stage pipe strings without leakage, and cannot cooperate with double-stage pipe strings to deal with low-pressure leakage. The problem of continuous sand washing in wells

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  • Two-tube reverse circulation continuous sand flushing device

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Embodiment Construction

[0009] In the accompanying drawings, a double-pipe reverse circulation continuous sand washing device is composed of a double-pipe continuous sand washing inner pipe assembly and a double-pipe continuous sand washing wellhead self-sealing; 3. Cylinder body II4, core tube 5, stop block 6, lower moving sealing tube 7, spring 8, oil pipe variable buckle joint 9, O-ring 10, flange 11, middle seat 12, 7-shaped sealant Core 13, briquetting block I14, briquetting block II15, outlet joint 16, and inlet joint 17; the center core tube 5 is placed on the oil pipe variable button joint 9, the spring 8 is set on the bottom of the center core tube, and the lower moving sealing tube 7 passes through the center The center of the core tube 5 is pressed on the spring 8, the stop block 6 is pressed on the lower moving sealing tube 7, the moving sealing tube 3 passes through the male joint 2 of the connecting pipe and is pressed on the lower moving sealing tube 7, and the cylinder body II4 is conn...

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Abstract

The double pipe reverse circulating continuous sand washing apparatus for petroleum extracting workover treatment consists of two barrels, one connecting pipe joint, two movable sealing pipe, one inner pipe, one stopping block, one spring, one oil pipe joint, one O-ring, one flange, one middle seat, one L-shaped sealing rubber core, two pressing blocks and two end joints. The present invention can complete continuous sand washing to low pressure leaker with double pipe, and may be applied in petroleum extracting operation.

Description

Technical field: [0001] The invention relates to a double-pipe reverse circulation continuous sand washing device for sand washing in oil production and workover operations. Background technique: [0002] At present, the continuous sand washing device used for sand washing in oil production and workover is aimed at single-tube positive circulation sand washing, and can only be used for conventional wells without leakage. When encountering severe low pressure leakage wells, the sand washing fluid will leak into the formation. The circulation system cannot be established, so the device cannot meet the needs of sand washing operations in lost wells. CN2410413Y and patent No. 02281034x continuous sand washing device, although they have realized the continuous sand washing operation of conventional wells and improved the production timeliness and sand washing efficiency, but These devices are only suitable for single-stage sand washing pipe strings, and cannot be used to carry ou...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00
Inventor 管恩东张勇高歌军徐宏权何建忠李洪旭沈艳丽王剑杰钟宏黄菊珍
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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