DJ Surface Bumper Jar

Product Detail

DJ Surface Bumper Jar

Technical Feature

The surface jar is an effective tool for resolving the problem of drill tool stuck in down hole. It is connected with the surface section of drill string, the device to adjust the tonnage shall protrude from the rotary disc face, the violent down jarring to the stuck catch can be clearly seen when the surface jar makes jarring operation. The jarring strength for the tool can be easily adjusted and it is an easy operated, unique designed tool which can make continuous down jarring. The surface jar, which not only can bear heavy load and strong torque but also owns a good sealing property and can withstand the mud circulation with high pump pressure, has proven to be a safe, successfully effective releasing tool through many years using.

Technical Parameters

Parameter/Model	DJ46B(4 3/4")	DJ70B(7")	DJ70C(7")	DJ80B
Product Code	0208000	0213000	0213100	0215000
O.D. (mm)(in)	121 (43/4″)	178 (7″)	178 (7″)	203
Max. Jarring force MN (tf)	0.4 (41±5)	0.68 (70±5)	0.68 (70±5)	0.68 (70±5)
Max. Tension Load MN (tf)	1.2 (122.00)	1.5 (153.00)	1.5 (153.00)	2.1 (214.30)
Sealing Pressure Mpa (kgf/cm2)	30(294)	30(294)	30(294)	30(294)
Stroke(mm)(in)	1500 (≈59″)	1220 (≈48″)	1800(≈70.87″)	2000(≈78.75″)
I.D. (mm)(in)	30(1 3/16″)	47(1 7/8″)	47(1 7/8″)	50
Connection	NC38	NC50	NC50	NC50
Closed Length (mm)(in)	3095 (121.85)	3090 (121.8″)	3670 (144.5″)	3890(153.15″)
Orginal releasing force (tf)	15	20	20	20
Weight (kg)	170	450	500	730