Specifications
API 7-1 DJ Type Surface bumper jarAPI Connection
Type DJ46& DJ70II
API 7-1 DJ Type Surface bumper jar
The surface bumper jar type DJ is an effective tool for resolving the stuck problem by producing downward jarring impact to the stuck portion. It is used to joint at the drilling platform, so the tool has the advantages of powerful jarring force, reliable tonnage-adjusting and convenient utilization. It is especially effective for freeing key-seat and tight-hole tool.
Specification Series and Performance Parameters
Type | O.D mm (in.) | I.D. mm (in.) | Connection API | Max tensile load MN (Lbf) | Max jarring load MN (Lbf) | Max stroke mm (in.) | Seal pressure MPa | Overall length mm (in.) |
DJ46 | 121 (43/4) | 32 (11/4) | NC38 | 0.90 (202500) | 0.40 (90,000) | 1 800 (70.87) | 20 | 3 395 (133.66) |
DJ70Ⅱ | 178 (7) | 50 (115/16) | NC50 | 1.80 (405000) | 0.75 (168,750) | 1 222 (48.11) | 20 | 3 030 (119.29) |
