BXJ Lubricated Fishing Bumper Sub

Product Detail

BXJ Lubricated Fishing Bumper Sub

Technical Features

Lubricated fishing bumper sub is one of the jars which produce jarring force by means of the energy caused by heavy weight objects when moving down, its inner chamber is full of hydraulic oil so as to ensure a longer service life. The tool is suitable for deep hole and middle deep hole operation. With some advantages: Can produce strong one way down jarring force, maximum jarring force, continuous down jarring force. Medium jarring force; continuous up jar, low-grade jarring force; can release fishing tool; can act as constant pressure drill tool, simply structure, easy operation, all these make it widely used jarring tool.

Working principle

● Energy conversion in jarring operation

Jarring downward is made by means of conversion. Rasing 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 the force the drill stem to move downward in acceleration. When bumper sub reaches a closed position, the above energies at this instant change into a large downward jarring force.

● Main factors having influenced on jarring force.

Many factors influence on jarring force. But key factors as follows:

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

2. The longer the spring extension of drill stem is when raising drill stem. The bigger the jarring force is.

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

Technical Parameters

Parameters/Model	BXJ31B	BXJ34B	BXJ36B	BXJ42B	BXJ44B	BXJ46B	BXJ62B	BXJ64B	BXJ70B	BXJ80B
Product Code	1101000	1102000	1103000	1105000	1106000	1108000	1110000	1111000	1113000	1115000
O.D. (mm)	80	89	95	108	114	121	159	165	178	203
I.D. (mm)	25.4	25.4	28	32	38	38	57	57	70	76.2
Sealing pressure (MPa)	30	30	30	30	30	30	30	30	30	30
Max .tensile load (tf)	30	40	50	70	80	90	143	143	153	220
Work stroke (mm)	394	394	394	394	394	400	460	460	465	465
Connection	2 3/8REG	NC26	NC26	NC31	NC31	NC38	NC50	NC50	NC50	6 5/8REG
Closed length (mm)	2355	2400	2514	2450	2450	2446	2730	2730	2950	3108