A scraper automatically stretches out and conveniently controls the sand scraper

A scraper, automatic technology, used in cleaning appliances, wellbore/well components, earth-moving drilling, etc., can solve the problems of large casing damage in the vertical well section, high consumption of high-pressure power fluid, and difficult running in the curved section, etc. Achieve the effect of small casing damage, low consumption, and a wide range of applicable working conditions
CN108386159BInactive Publication Date: 2020-06-05SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2020-06-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a conveniently controlled sand scraping instrument with an automatically extended scraper. The conveniently controlled sand scraping instrument mainly consists of a housing, a main piston, a main piston variable-cross section cylinder, a support cylinder and a scraper. The conveniently controlled sand scraping instrument is characterized in that the main piston is connectedwith the upper end of the main piston variable-cross section cylinder through threads; the main piston variable-cross section cylinder is positioned inside the housing; a variable-cross section of themain piston variable-cross section cylinder is supported by a fixed baffle ring; the fixed baffle ring is fixed on the housing through a fixing pin; an outer through hole is formed in the housing inthe upper part of the fixed baffle ring; a support cylinder is in threaded connection with the housing; an upper support base is axially positioned through a shaft shoulder on the support cylinder; anupper connecting cap a of the upper support base is in threaded fixation on the support cylinder; a scraper is supported by a spring; a scraper support sleeve is in threaded connection with the support cylinder; a lower support base is positioned through a shaft shoulder; a connecting cap b at the lower end of the lower support base is in threaded fixation with the support cylinder. The instrument is applicable to oil field pipeline well wall sand cleaning operation, and the scraper can be conveniently fed into a bent well section downwards, can automatically extend after being fed, and in addition is convenient and rapid to control.
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Description

technical field

[0001] The invention relates to the field of sand removal for oilfield pipelines, in particular to a sand scraper which is used for well workover and sand removal operations under different working conditions and which can be automatically extended and conveniently controlled by a scraper. Background technique

[0002] Unconsolidated sandstone reservoirs in my country have a wide distribution range and large reserves. For unconsolidated sandstone reservoirs, the sand production of oil layers is the main obstacle to increase the oil recovery rate of sandstone reservoirs. How to solve the problem of sand production in oil wells is the main way to increase the production of this kind of reservoirs. Sand production in oil wells is extremely harmful. If it is not cleaned for a long time, many problems will occur. The main manifestations are: oil wells are shut down due to sand buried in oil layers or wellbore sand plugging; ground and downhole equipment are sever...

Claims

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