Torsional Jars «SHOCK TURN»

Design of torsional jar is own «BURINTEKH», Ltd development protected by Russian and foreign patents.

Why is stuck tool released by only up-and-down impacts along well axis? In fact, life experience suggests that for pulling, for example, driven nail out it is better not only pull it, but pull with simultaneous turn. Obviously, it is easier to free stuck downhole tool if not only axial impact loads but also shock torsion torque are applied. To solve this challenge, we developed torsional jars «SHOCK TURN», which can affect stuck tool by clockwise and counterclockwise and up-and-down impacts in different combinations.

Main advantages are:

  • High power capacity. Torsional jar impact strength 5…6 times bigger than ordinary jar;
  • Singular case thread (between body and bottom sub);
  • Compactness which allows transport it on pickup and deliver it to hard-to-reach areas on helicopter without external suspension;
  • Absence of extreme loads to hydraulic cylinder appearing during jar performance;
  • Ability of quick repair by changing hydraulic cylinder;
  • Extended functional capabilities.

Tool series

Outside diameter, mm

Drift diameter, mm

Length in fold position/with pulled out spindle, mm

Connection threads GOST 28487-90

Weight, kg

YAGK-108

108…111

22

2,034/2,334

Z-86

118

YAGK-114

114.8

50.8

2,100/2,400

Z-86

126

YAGK-124

124…127

50.8

2,084/2,384

Z-102

139

YAGK-172

172…176

76

2,300/2,700

Z-133

360