KXJ Fishing Bumper Sub

Product Detail

KXJ Fishing Bumper Sub

Technical Features

KXJ type bumper jar (hereinafter called as bumper jar )is a mechanical jarring tool . It can make jar repeatedly the stuck drill stem to free from stuck point. When stuck drill stem can not be released by lifting and jarring, the bumper jar can be rotated to make releasable fishing tool to release fish. When used with mechanical internal cutter, it can provide an expected feeding force to the internal cutter so as to cutting steadily. When used with reversing unit , it can compensate the rising stroke for threads after reversing.

Working mechanism

● Energy conversion in jarring operation

Jarring downward is made by means of energy conversion. Raising drill stem shall make bumper jar to be pull down at a certain height to produce potential energy. Go on raising drill stem, the drill stem has a strain energy due to spring strain. When drill stem is lowered suddenly , the energy stored in drill stem force the drill stem to move downward in acceleration. When bumper jar reach a closed position, the above two energies at this instant change into large downward jarring force.

● Main factors having influence on jarring force

The bigger hanging weight on top drill stem of bumper jar makes a bigger jarring force;

The longer the spring extension of drill stem is when raising drill stem, the bigger the jarring force is;

The longer the stroke of the bumper jar is , the bigger the jarring force of jar is .

Technical parameter

Parameter/Model	KXJ31B	KXJ42B	KXJ44B	KXJ46B	KXJ62B	KXJ70B	KXJ76B	KXJ80B	KXJ85B	KXJ90B
Product Code	0401100	0405000	0406000	0408000	0410000	0413000	0414000	0415000	0419000	0416000
O.D. (mm)	79	108	114	121	159	178	197	203	219	229
I.D. (mm)	25.4	38	38	38	51	70	70	70	76	76
Sealing pressure (MPa)	30	30	30	30	30	30	30	30	30	30
Max. tensile load (kN)	300	700	1120	1200	1430	1530	1630	1630	1630	2200
Max. work torque (kN.m)	3	6	7	8	13	15	20	20	20	25
Work stroke (mm)	508	1000	1000	1000	1400	1400	1500	1500	508	1500
Connection	2 3/8 REG	NC31	NC31	NC38	NC50	NC50	6 5/8 REG	6 5/8 REG	6 5/8 REG	7 5/8 REG
closed length (mm)	1410	2100	2100	2110	2604	2650	2730	2730	1769	2760
Weight(kg)	45	95	130	146	240	330	430	455	383	660