HYDRAULIC JARS

The ACT Hydraulic Jar is designed to deliver a controlled upward impact load during wireline operations. When a strain is taken on the wireline, the top sub and mandrel are pulled upward, while the piston movement is delayed by the hydraulic fluid in the cylinder. This delaying action allows sufficient strain to be taken on the wireline to strike a blow of desired intensity, when the piston passes from the cylinder bore to a larger bore, the jar is then closed to reset and the operation is repeated. Hydraulic jars are run above a spang link jar.