Use of Drilling Jar

(1) The Drilling Jar shipped from the factory or sent to the well must pass ground tests and can be put into use only after passing the test.

(2) Check whether the upper and lower jar spindles are fully loosened. In order to prevent the mandrel from closing on the ground, a clamp device is specially configured to clamp on the exposed end of the mandrel, as shown in Figure 7-6. It cannot be removed until the tool is connected to the drill string and before entering the well.

(3) When adjusting the shock force of the lower hammer, ensure that the adjusted shock force should not exceed the drill string mass above the jar under any circumstances. How to adjust the shock force:

Remove the adjusting ring locking pin and adjust it on the test stand to the designed compression release force, that is, the shock tonnage. When the adjusting ring is turned in the increasing direction, in order to increase the shock force, each time the adjusting ring is turned one hole, the load changes by about 10~30kN. After adjustment, tighten the locking screw plug.

(4) Before going down the well, check whether the oil plugs are loose. Is theDrilling Jar in a locked state?

(1) Lift the prepared jar onto the drill floor with a lifting sub-joint, apply sealing grease and connect it to the drill string. Lift the drilling tool and remove the clamp on the mandrel (should be kept properly).

(2) Strictly control the drilling speed when drilling to prevent sudden obstruction at the diameter reduction point, which will cause the downward hammer to be released to produce a downward stroke.

(3) If the downstroke has occurred, the upstroke device will inevitably return to the pre-shock state. At this time, the drill string should be lifted slightly upward, the lower hammer should be slid back into place, the operation should be suspended for a few minutes, wait for the upper hammer to be released, and be careful not to lift it violently.

(4) During the process of drilling and tripping, the tongs should bite at the specified position when removing the thread. After drilling, the jar should be in the open state. After installing the mandrel clamp at the wellhead, remove and weave the column into the drill pipe box. Never allow any clamping and lifting tools to be stuck in the open part of the mandrel to prevent damage to the mandrel.

(5) The Drilling Jar is always in the fully extended state during raising and lowering in the well.

(6) If the jar is no longer used, the surface must be cleaned, the exposed mandrel part should be smeared with butter, and the drill floor should be removed safely to prevent impact.

(1) The jar drills under tension.

The jar is in an open state during the entire drilling process under tension, and the mandrels of both parts are in a stretched state. The quality of the drill collar in the lower part of the jar and the force exerted by the pump pressure on the mandrel and flush pipe of the upper striking part and the mandrel and scraper sleeve of the lower striking part all contribute to the opening of the tool. The jar works best under tension.

(2) Drilling with the jar pressurized.

The jar can also drill under pressure, but the pressure exerted on the tool cannot exceed the pre-adjusted jar tonnage and pump pressure exerted on the jar mandrel and scraper body before the jar is lowered into the well. Half of the sum, the force exerted by the pump pressure on the drilling Jar is determined with reference to Figure 7-7.

(3) When the jar is pressurized for drilling, the upper hammer may be closed. When lifting the drill string, a slight upward shock may occur due to the mass of the lower drill string.

(4) Regardless of whether the jar is drilling under tension or pressure, the drill must be fed evenly to prevent the drill from slipping or skipping.

(5) If you encounter a jam during the drilling process, you can activate the upper clicker to release the jam.

Vigor will provide you with a reliable solution, Please contact us at info@vigorpetroleum.com.