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Drilling Jar

Drilling jars are used in the drilling of oil and gas wells to help break free or "jar" a stuck drill pipe.
They are designed to provide intermittent and sudden impact force to the drill stem whenever it becomes stuck or gets into a difficult drilling situation. Drilling jars typically consist of an outer housing, a mandrel, and a set of hydraulic mechanisms that enable them to store and release energy.
When the drilling jar is activated, it generates a high impact force that helps release the stuck drill pipe, free it from obstructions, and continue the drilling process.
Vigor has different types of drilling jars available, including mechanical drilling jar, full-hydraulic drilling jar, integral mechanical drilling jar, hydro-mechanical drilling jar and mechanical & hydraulic drilling jar.

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Description

China Vigor Drilling Oil Tools And Equipment Co., Ltd. is one of the most professional manufacturers and suppliers of drilling jar in China, featured by competitive price and fast delivery. Welcome to buy high quality drilling jar in stock here from our factory.

A drilling jar is installed in the drill string during drilling operations. If the drill string becomes stuck, simply picking up or slacking off on the drill string creates an upward or downward jarring force through the jar, quickly freeing the stuck pipe. their key feature is that they can generate high kinetic energy at high velocity to overcome the forces holding the stuck drill string, ensuring smooth drilling operations and reducing drilling costs.

Drilling jars Type

1. Mechanical

2. Hydraulic

3. Hybrid mechanical/hydraulic

Vigor has different types of jars available, including mechanical, full-hydraulic, integral mechanical, hydro-mechanical, and mechanical & hydraulic jars.

Techinical Parameters

Full-hydraulic Drilling Jar

O.Dmm(In.)

I.Dmm(In.)

Connection API

Max. Upward

Jarring Force

KN(lbf)

Max. Downward

Jarring Force

KN(lbf)

Max Working

Load

KN(lbf)

Tensie Yield

Strength

kN(lbf)

Max.Working

Torgue

kN.m(lbf.ft)

Torsional

Yield

Strength

kN.m(Ibf.ft)

Length

(In.)

(3-1/8)

25.4

(1)

23/8REG

150

(34,000)

(13,500)

350

(78,000)

600

(130,000)

(2,200)

(4,400)

5,550

(218-1/2)

(3-3/4)

31.8

(1-1/4)

27/8REG

200

(45,000)

100

(22,500)

600

(130,000)

1000

(225,000)

(2,950)

(5,900)

5,600

(220)

121

(4-3/4)

50.8

(2)

NC38

350

(79,000)

180

(40,000)

930

(209,000)

1400

(315,000)

(11,000)

(20,000)

9,801

(385-7/8)

159

(6-1/4)

57.2

(2-1/4)

NC46

700

(160,000)

350

(79,000)

1600

(360,000)

2450

(550,000)

(18,000)

(48,000)

9,830

(387)

165

(6-1/2)

57.2

(2-1/4)

NC50

700

(160,000)

350

(79,000)

1600

(360,000)

2450

(550,000)

(18,000)

(55,000)

9,830

(387)

178

(7)

71.4

(2-13/16)

NC50

800

(180,000)

400

(90,000)

2400

(540,000)

3700

(830,000)

(22,000)

(59,000)

9,830

(387)

203

(8)

71.4

(2-13/16)

65/8REG

1000

(225,000)

500

(112,000)

2800

(630,000)

4450

(1,000,000)

(25,800)

145

(100,000)

9,918

(390-1/2)

229

(9)

76.2

(3)

65/8REG

1200

(270,000)

600

(135,000)

3000

(670,000)

7100

(1,600,000)

(25,800)

160

(118,000)

9,908

(390)

241

(9-1/2)

76.2

(3)

75/8REG

1250

(280,000)

650

(146,000)

3500

(787,000)

8100

(1,820,000)

(29,500)

180

(133,000)

9,908

(390)

Jarring Loads of the Hydraulic-mechanical Drilling Jar Unit: KN

Model	Mpward Jarring Load	Up Jarring Unlock Force	Ex-plant Downward Jarring Load	Hydraulic Load Testing Pulling Force	Time of the Hydraulic Delay
VDHM121	350	200±25	150±25	220±10	30～60
VDHM140	450	250±25	150±25	300±10	35～90
VDHM159	700	370±25	200±25	390±10	45～90
VDHM165	700	400±25	220±25	420±10	45～90
VDHM178	800	400±25	220±25	420±10	45～90
VDHM197	1000	440±25	270±25	460±10	45～90
VDHM203	1000	440±25	270±25	460±10	45～90
VDHM241	1250	460±25	280±25	480±10	60～120

Item		VDHM121	VDHM140	VDHM159	VDHM165
O.D.	In.	4-3/4	5-1/2	6-1/4	6-1/2
I.D.	In.	2-1/8	2-1/4	2-1/4	2-3/4
Connection API		NC38	NC38	NC46	NC46
Up Jar Stroke	In.	9	9	9	9
Down Jar Stroke	In.	6	6	6	6
Working Torqueft	lbs	11,000	14,600	22,000	22,000
Max. Tensile Load	lbs	250,000	300,000	500,000	500,000
Max. Up Jar Load	lbs	78,000	100,000	157,000	157,000
Max. Down Jar Load	lbs	56,000	67,200	78,000	78,000
Overall Length mm	mm	4,500	5,008	5,007	5,256
Piston Area mm²	mm²	2,827	4,350	6,446	5,102

Principles

(1) Upward Jarring

When the drill string becomes stuck, pick up the string (after first resetting) to pressurize the hydraulic fluid in the upper cylinder, storing energy in the drill string. When the desired weight is picked up, stop lifting and quickly bleed off the pressurized fluid, instantly releasing the stored energy and creating an upward jarring force to free the stuck pipe.

(2)Downward Jarring

When the drill string becomes stuck, slack off the string (after first resetting) to pressurize hydraulic fluid in the lower cylinder, storing energy. When the desired weight is slacked off, stop and quickly bleed the pressurized fluid, releasing the stored energy downward to jar the stuck point free.

Features

● Prevent the drill string from getting stuck in the wellbore.
● Improve the drilling performance by increasing the rate of penetration (ROP) and reducing the drilling time.
● Help prevent equipment damage by absorbing shocks and preventing overloading of the drilling equipment.
● Help increase the safety of drilling operations by preventing unexpected jarring and sudden bit releases.

Applications

China Vigor Hydraulic and Hydraulic-mechanical Jar are designed for use during drilling operations to apply an intensified force either up or down against a stuck portion of the drill string, it is an ideal tool for directional well and deep well drilling.

(1) They are used to free the stuck tools and make a jarring. It integrates the up jar and down jar and can deal with the stuck accidents that happen in the shortest time during the drilling. It is an ideal jarring tool for the directional well and deep well.

(2)Operators can adjust the lifting and lowering of the drill tool (without the adjustment of torque and outside) to get the releasing up a jar or down jar force when using the Jar downhole.

(3)Moreover, the operator can adjust the jarring force from small to the maximal force required. It can be broadly used for drilling, coring, fishing, and workover because of its easy operation, convenience, and high reliability.

(4)Hydraulic and Hydraulic-mechanical Drilling jars are widely used in America and the Middle East area. It helps our customers to reduce the working time while there is a stuck during the drilling operation, quality is recognized by users.

(5)It is also used in Shale Gas exploitation by some of our partners due to its reliable performance and economical cost. We also provide our suggestions and solutions when the customer has a problem with operation, maintenance testing, etc. The Hydraulic Shock Tool can absorb or reduce axial vibration and thrust load of the drilling.

(6)Hydraulic Shock Tool also has good results for prolonging the service life of the bit and protecting the drilling tools and the surface equipment. For more information on the Hydraulic Shock Tool, please email us.

FAQ

Q: Can drilling jars be used in all types of wells?

A: Yes, it can be used in various types of wells, including oil, gas, and geothermal wells. They are designed to withstand the conditions encountered in drilling operations.

Q: How are they selected for a specific operation?

A: Its selection depends on factors such as well depth, formation characteristics, pipe size, and erity of the stuck pipe or drilling challenges. Consulting with our specialist or engineer is recommended for proper selection.

Q: Are they reusable?

A: Regular inspection, cleaning, and lubrication are essential for maintaining its performance.
Following the manufacturer's guidelines and recommendations for maintenance will help ensure optimal performance.

Q: What safety precautions should be taken when using it?

A: Proper safety procedures should always be followed when using it, including wearing appropriate personal protective equipment (PPE) and adhering to operating instructions.

Additionally, it is advisable to undergo proper training to handle and operate safely.

Q: How do I troubleshoot if my drill jar is not performing effectively?

A: If you encounter issues with your drill jar's performance, you can consult with our specialist.
They can provide troubleshooting assistance and guidance to identify and rectify any problems.

VIGOR specializes in R&D, design, manufacturing, and sales of oil drilling tools and equipment. Our extensive manufacturing expertise and comprehensive facilities ensure product quality.

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