Drilling jar

‌Drilling jar is a tool that is used at the wellhead and relieves the sticking accident in the well. It is suitable for dealing with the sticking accidents that require downward shock such as keyway, diameter reduction, block drop, sticking and suction. It can also be used to relieve the fishing tool in the well. Whether any part of the drill string is stuck, slip-type downhole tools are stuck, fishing tools are stuck, or tools are stuck, in all situations the drilling jars of Sunrise petro can be used.

DESCRIPTION

Types

Sunrise petro drilling jars can be divided into 3 types, including Mechanical type, hydraulic type and Mechanical hydraulic combined type.

TECHNICAL DATA

Principle and features of mechanical drilling jar

Using the principle of mechanical friction, the locking mechanism adopts a set of ribbed slips. The release of the slips is controlled by the deformation of the elastic sleeve under pressure, and the shock force is not affected by the temperature in the well. Mechanical drilling jar can be designed into two types, adjustable and non-adjustable. The shock force of the adjustable jar is adjusted at the wellhead, and the shock force of the non-adjustable jar is set when the product is assembled and cannot be adjusted on site, but the length of the whole machine is short, and the work is safe and reliable. Mechanical drilling jars have high requirements on metal materials and their heat treatment and machining accuracy.

Principle and features of hydraulic drilling jar

The damping effect of the hydraulic oil flowing in the small flow passage is used as the locking mechanism, and the release caused by the sudden change of the flow passage is used to produce a blow in the jar, thereby forming a vibration in the drill string. Due to the limitation of the working principle of its locking mechanism, hydraulic drilling jar can only produce shocks in a single direction, generally upward shocks. Due to the long time delay function superior to the mechanical drilling jar, its jarring force can be adjusted arbitrarily by the driller's operation. However, because hydraulic media, sealing materials, and sealing structures are easily affected by factors such as wear and well temperature, the product life, adaptability and reliability are all unstable.

MORE DETAILS

Principle and features of mechanical-hydraulic combined drilling jar

Combining the advantages of mechanical and hydraulic drilling jar principles, even if the hydraulic delayed jarring effect fails, the mechanical jar can still be used, and the technical performance is greatly improved, which is in line with the future development direction of jar products.