Up Jarring Working Principle
It show us the jarring state unlocked after be adjusted when it comes to the jarringposition the moving axis should snap in the inside threads of the slips. The outerthread 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 springouter 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 ofthe axis will move out from the slips' inside teeth, Then stored power will release andgive a up and down double-way force, the tool will return to the state the ready to jarring position. Repeat the following operation, we can release the sticking drillingtools.
Lower Jarring Working Principle
There are a set of spring sleeve on the top of the slips. When the stem give a pressureon the jar, it can pass through the upper sub, upper control sleeve, upper regularingsleeve 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 thepredetermination position, the teeth top of the slips will touch the teeth of the frictionsleeve, slips will open to let the moving axis release from the slips teeth, the down-way
jarring force against the upper jarringforce.
