High Pressure Hydraulic Jar For Drill Stem Testing Service Big John Jar

The hydraulic jar is a safety tool of drill stem testing string, the hydraulic jar in Halliburton type is called Bigjohn Jar.

The hydraulic jar helps free a stuck tool or tool string by resisting a pull on the workstring, when the workstring is stretched by the pull, tension in the jar is released and an upward impact is delivered to the stuck tool.

The time delay of hydraulic jar required to release the temporary resistance varies in relation to the weight of the pull. For example, a light pull requires more time for release than a hard pull. When tools below the jar are stuck, a steady pull applied to the jar creates an upward impact blow to the string. The jar can be re-cocked when the string is set down.

Technical parameter of Hydraulic Jar

Advantage of ZZ TOP OIL TOOLS

ZZ TOP Oil Tools expertise in manufacture of the Drill Stem Testing Tools for more than Ten years, the professional Reserch and Development (R&D) department improves the advanced technology in design of the Drill stem testing tools for well testing service.

ZZ TOP designs and chooses the raw material of DST tools according to the customers' oil well condition, and make all our effort to supply the cost effective well testing tools to satisfy the customer, and improve the test tools to meet the industry’s demand for ultra-high pressure and temperature downhole operation.

* Drill stem testing tools are available for cased hole, open hole and slim hole including:

* Full bore retrievable packer, full bore retrievable circulating valve, full bore retrievable safety joint,
* Downhole tester valve, select tester valve, LPR- N Valve,
* OMNI valve, multi-cycle circulating valve, hydraulic jar, vertical shock absorber, radial shock absorber, RD safety circulating valve,
* High pressure retrievable packer with bypass, CHAMP packer, IPO valve, tubing string test valve, sleeve type drain valve, rupture disk sampler, super safety valve with control panel, BOP safety valve for downhole operation and so on.

Welcome to contact us for more information!