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The Detail Introduction of Drilling Jar .pdf

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The Detail Introduction of Drilling Jar
In drilling operation, there often happen drill blocked due to complex geological
structure (such as borehole collapse, bare eyes formation and extrusion plastic flow),
improper technical measures (such as the pump stops for too long, bit balling, etc.).
Drilling jar is an effective tool to solve drill blocked.
The main using type of jar concludes drilling jar, fishing jars and ground jars.
The drilling jar should be set in drill string combination. If encounter sticking in the
process of drilling or tripping, drilling jar can solve the problem at any time. Just
when you need it stuck well, can the fishing jar work. And it can’t work for a long
time. Ground jar only use at the wellhead. Its shock effect of the card points is
downward shock. It is more convenient to use in the field.

The structure of drilling jar can be divided into mechanical, hydraulic,
mechanical-hydraulic three kinds.
Mechanical drilling jars. It use the theory of mechanical friction.The locking
mechanism used kava. Mechanical jars can be designed into adjustable and nonadjustable shock force two kinds. Adjustable jar adjust its shock force at the
wellhead. The shock force of non-adjustable jar is set in the product assembly and
can’t be adjusted in the process. But it is short and safe, reliable. Mechanical drilling
jars set high standard to metal material and heat treatment, precision machining.

+86 182 3419 6903

Hydraulic drilling jar. It regards damping effect produced in hydraulic oil flow in
the flow path as the locking mechanism. Hydraulic drilling jar can only generate
shock in a single direction (usually upwards shock) due to its locking mechanism
limitations. Due to long delay function which superior to mechanical jar, its size can
be jarring force by operation of any regulation driller. The Hydraulic drilling jar is
strict with seal design and selection of materials and the machining accuracy.
Combined mechanical-hydraulic drilling jars. It concentrates the advantages of
these two jar principle. Even if the hydraulic delay shock function failure, mechanical
drilling jars can work. Its technical performance get a high improvement and it is
closed to the direction of drilling jar development.
Drilling jar plays an important role in drilling. Correctly choosing and using jar
products can play its proper performance. For the drilling industry, it bring greater
economic benefits.

+86 182 3419 6903

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