ZJS Jar Intensifier

The ZJS type jar intensifier is a kind of down hole fishing jar designed to increase jarring energy to top jar .

Parameter of ZJS Jar Intensifier

The ZJS type jar intensifier is a kind of down hole fishing jar designed to increase jarring energy to top jar .

Therefore ,it must be run in conjunction with YSJ type hydraulic top jar or CSJ type super jar. Its main function is to supply acceleration to the upper end of the jar during the free jarring stroke. With a special function , the intensifier is essentially a fluid spring which not only can accelerate the top jarring action but also make the jarring action directly to strike on the fish and reduce damages to the drill tool and fishing tool.

Working principle

When it is used, the jar intensifier is connected on the top of drill collar and on the lower end of drill stem. When the fishing tool engage the fish and the drill tool is lifted up, the silicone oil in the top chamber of piston is compressed and a large number of energy in the jar intensifier will suddenly release, the energy suddenly released will provide a very large acceleration for frill collar and top jar to move upward . When the top jar reaches up to max. stroke, a strong top jarring action will impact directly on the fish, as a result, one time jarring is produced, and more times jarring will be effected by repeating this course.

Parameter Model ZJS31B ZJS36B ZJS42B ZJS44B ZJS46B ZJS62B ZJS64B ZJS70B ZJS76B ZJS80B ZJS90B
O.D.(mm) 79 95 108 114 121 160 165 178 197 203 229
I.D.(mm) 25.4 28 38 38 38 57 57 57 71.4 71.4 76
Overall length of pull down (mm) 2991 3110 3240 3340 3340 4500 4500 4000 4010 4010 4070
Strock(mm) 215 215 250
Connection 2 3/8REG NC26 NC31 NC31 NC38 NC50 NC50 NC50 6 5/8REG 6 5/8REG 7 5/8REG
Max. tensile load downhole (KN) 300 550 700 800 900 1500 1500 1800 2100 2200 2500
Max. work torque

(kN.m)

3 4 6 7 8 15 15 17 20 20 22
Sealing pressure 20 20 20 20 20 20 20 20 20 20 20
Pull down Full stroke force(tf) 13-15 17-20 25-30 25-30 30-35 60-65 60-65 75-85 62-67 62-67 75-85
Weight 120kg 170kg 185kg 200kg 230kg 530kg 560kg 600kg 860kg 900kg 1030kg

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