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Qjz Mechanical Drilling Jar - China

price: contact company for price

QJZ type mechanical drilling jar is a kind of fully-mechanical jarring

tools.It can release the drilling tools sticking accidents by providing

a up and down jarring force.Basically, it is part of the drill

stem, whenever needed, the jarring force can increase the working


- Up-jarring working principle

It show us the jarring state unlocked after be adjusted when it comes to the jarring position the moving
axis should snap in the inside threads of the slips.The outer thread of the slips and inside sleeve are
under the friction state with.When lifting the drill stem, the upper sub, upper control sleeve, middle sleeve
lower control sleeve, lower regularing sleeve, spring type inside sleeve, spring middle sleeve, and spring

outer sleeve will move upward while friction sleeve keep still.The slips can be opened when its outer
thread top touch the friction sleeve's teeth, at the moment the teeth of the axis will move out from the
slips' inside teeth, Then stored power will release and give a up and down double-way force, the the tool
will return to the state the ready to jarring position.Repeat the following operation, we can release the
sticking drilling tools.

- Lower jarring working principle

There are a set of spring sleeve on the top of the slips.When the stem give a pressure on the jar, it can
pass through the upper sub, upper control sleeve, upper regularing sleeve to work on the , spring type
inside sleeve, spring middle sleeve, and spring outer sleeve.Slips will move upwards while the friction
sleeve keep still, until reach the predetermination position, the teeth top of the slips will touch the teeth of
the friction sleeve, slips will open to let the moving axis release from the slips teeth, the down-way jarring
force against the upper jarring force.

Feel free to contact us with all your questions

Company Contact:

  • Phone: +

  • Address: No.2999 ,XinYang Road,FengXian District, Shanghai, China

  • Email: Email

Published date: August 2, 2013 -

  • Business Description: Tianhe Oil Group,originally established in 1973, is a comprehensive

    enterprise of equipment manufacturing and oilfield service providing.

    We're specialized in innovating, manufacturing and sales of drill and

    petroleum extraction tools, equipments and oil field services.

    Tianhe Oil Group is a council member of CPEIA (China Petroleum and Equipment Industry Association), having been confered as a national Hi Tech company. Tianhe is a well known Chinese trademark. We've been certified in compliance with ISO, API, NS 1, and HSE management system,we have now high end machining centers like CNC turning centers from Mazak,all in one MILLTURN center from WFL Millturn Technologies GmbH&Co.KG as well as a wide range of other sophisticated tooling equipments.

    A strong domestic sales network has been established,covering all oilfields of CNPC, SINOPEC and CNOOC. Specifically today, we're exporting to 45 countries around the globe, overseas trading amount has topped over 80% of our business.

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