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DJ Surface Bumper Jar

DJ Surface Bumper Jar

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.

DJ Surface Bumper Jar

Specifications – DJ Surface Bumper Jar

Parameter/Model

DJ46B(4 3/4″)

DJ70B(7″)

DJ80B

 O.D. (mm)

121 (43/4″)

178 (7″)

203

Max.Jarring force (tf)

0.4 (41±5)

0.68 (70±5)

0.68 (70±5)

Max.Tension Load (tf)

1.2 (122.00)

1.5 (153.00)

2.1 (214.30)

Sealing Pressure (kgf/cm2)

20 (196)

20 (196)

20 (196)

Stroke(mm)

1500 (≈59″)

1220 (≈48″)

2000(≈78.75″)

I.D. (mm)

30(1 3/16″)

47(1 7/8″)

50

Connection

NC38(31/2″IF)

NC50(41/2″IF)

NC50

Closed Length (mm)

3095 (121.85)

3090 (121.8″)

3890

Orginal releasing force

15

20

20

Weight

170kg

450kg

730kg

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