ZJS Jar Intensifier

Product Detail

ZJS Jar Intensifier

Technical Features

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 is thus stored .During lifting , when top jar reach up to free impact stroke, the stored energy in the jar intensifier will suddenly release, the energy suddenly released will provide a very large acceleration for drill 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.

Technical parameters

Parameter Model	ZJS31B	ZJS36B	ZJS42B	ZJS44B	ZJS46B	ZJS62B	ZJS64B	ZJS70B	ZJS80B	ZJS90B
Product Code	0501000	0503000	0505000	0506000	0508000	0510000	0511000	0513000	0515000	0516000
O.D. (mm)	79	95	108	114	121	160	165	178	203	229
I.D. (mm)	25.4	28	32	38	38	57	57	57	71.4	76
Overall length of pull down (mm)	2991	3110	3240	3340	3340	4500	4500	4000	4010	4070
Stroke (mm)	215	215	250	250	250	330	330	310	330	330
Connection	2 3/8REG	NC26	NC31	NC31	NC38	NC50	NC50	NC50	6 5/8REG	7 5/8REG
Max. tensile load downhole (kN)	300	550	700	800	900	1500	1500	1800	2200	2500
Max. work torque (kN.m)	3	4	6	7	8	15	15	17	20	22
Sealing pressure(MPa)	30	30	30	30	30	30	30	30	30	30
Pull down Full stroke force (tf)	13~15	17~20	25~30	25-30	30~35	60~65	60~65	75~85	62~67	75~85
Weight(kg)	120	170	190	200	230	530	560	600	900	1030