Drilling jars
![]() | API certificate |
![]() | Drilling jars |
![]() | land and offshore wells |
- Description
- Specifications
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During drilling operations, due to complex geological structures, such as well wall collapse, plastic flow and squeezing of the formation in the open hole, and improper technical measures, such as long pump stop time, bit mud packs, etc., drilling tools often get stuck.
Shock sub is one of the effective tools to eliminate stuck accidents.
Our company can provide while-drilling jar (composed of a hydraulic top jar and a mechanical dumper jar), mechanical while-drilling jar, hydraulic while-drilling jar, mechanical and hydraulic integrated while-drilling jar, super drilling jars, hydraulic top jar, and surface jar, etc.
Drilling jars are essential tools in oil and gas drilling operations, designed to help free stuck drill strings by delivering an impact or jarring force.
They are placed within the drill string and can be activated when a portion of the drill string becomes stuck in the wellbore due to differential pressure, debris, or other obstructions.
By applying tension or compression to the drilling jars, the tool delivers a sudden impact that can dislodge the stuck equipment, allowing drilling operations to resume.
Several types of drilling jars are commonly used, including hydraulic drilling jars, mechanical drilling jars, and combination jars.
Hydraulic jars operate using fluid pressure, while mechanical jars rely on mechanical forces.
The combination jars offer both hydraulic and mechanical features for maximum flexibility in various drilling conditions.
Manufacturers, factories, suppliers, and exporters of drilling jars are widespread, with China emerging as a leading hub for producing cost-effective and high-quality equipment.
Chinese manufacturers offer a wide range of drilling jars designed to meet international standards, including API (American Petroleum Institute) specifications, ensuring safety and durability.
In China, drilling jar factories focus on precision engineering and the use of high-grade materials, such as alloy steel, to ensure that the tools can withstand harsh downhole environments.
These manufacturers often export their products to major oilfield service companies worldwide.
Some prominent Chinese suppliers and exporters also offer customized solutions, ensuring that their equipment meets the specific needs of different drilling projects.
The price of drilling jars can vary significantly based on the type, size, and materials used.
On average, prices can range from $10,000 to $50,000 per unit, depending on the specifications and quality.
Chinese suppliers often provide competitive pricing, making them an attractive option for oil and gas companies looking to procure high-performance drilling jars at affordable rates.
Model | ZSJ94B | ZSJ90B | ZSJ80B | ZSJ76B | ZSJ70B | ZSJ66B | ZSJ64B | ZSJ62B | ZSJ56B | ZSJ46B |
O.D.(mm) | 9-1/2 | 9 | 8 | 7-3/4 | 7 | 6-3/4 | 6-1/2 | 6-1/4 | 5-3/4 | 4-3/4 |
241 | 229 | 203 | 197 | 178 | 172 | 165 | 160 | 146 | 121 | |
I.D.(mm) | 3, | 3 | 2-13/16 | 2-13/16 | 2-3/4 | 2-1/2 | 2-1/4 | 2-1/4 | 2-1/4 | 1-27/32 |
76 | 76 | 71.4 | 71.4 | 70 | 63.5 | 57 | 57 | 57 | 47 | |
(mm) Upward stroke | 13-1/2 | 13-1/2 | 14-1/2 | 14-1/2 | 13-1/2 | 13-1/2 | 13-1/2 | 13-1/2 | 13 | 13-1/2 |
343 | 343 | 368 | 368 | 344 | 344 | 344 | 344 | 332 | 305 | |
(mm) Downward stroke | 10 | 10 | 7-1/8 | 7-1/8 | 7 | 7 | 7 | 7 | 7-1/8 | 7 |
254 | 254 | 181 | 181 | 178 | 178 | 178 | 178 | 180 | 178 | |
Connection | 7-5/8REG | 7 | 6 | 6 | NC50 | NC50 | NC50 | NC46 | 4-1/2FH | NC38 |
(KN) Max. pull force | 2800 | 2800 | 2500 | 2500 | 2300 | 2200 | 2200 | 2200 | 2000 | 1400 |
Allowed working torque | 22 | 22 | 20 | 18 | 15 | 15 | 15 | 15 | 15 | 13 |
Norminal upward releasing force | 500~700 | 500~700 | 400~600 | 400~600 | 350~550 | 350~550 | 300~450 | 300~450 | 200~350 | 150~250 |
Max. upward releasing force | 1000 | 1000 | 750 | 750 | 700 | 700 | 550 | 550 | 450 | 270 |
Max. downward releasing force | 650 | 650 | 600 | 600 | 550 | 550 | 500 | 500 | 400 | 250 |