Downhole tools

 

Hydraulic / Mechanical Drilling Jar (HMJ)

Description:

The Bab Alandalus  Hydraulic Mechanical Drilling Jar is an all-purpose Drilling jar suited for all drilling applications. This jar is equipped with a mechanical ‘safety” latch and hydraulic delay when jarring upwards, a Mechanical latch for jarring downwards.

The Bab Alandalus  mechanical “safety” latch keeps the jar locked in the neutral position and eliminates unexpected jarring while tripping or racking the jar in the derrick. Latch release settings can be adjusted to expand the range of the jar placement in the drill string.

Hydraulic Delay while jarring upwards offers the operator the opportunity fire the jars harder or softer. Once the jar starts the delay sequence while jarring up wards the operator can increase the pull to hit harder if desired. It should be noted that the maximum pull during delay should not be exceeded, this limit is provided on our spec sheet.

Benefits & Features

  • No safety clamp is required
  • Mechanical Latch will keep jar in locked position and prevents unexpected firing while tripping or making connections
  • Can be used in extended reach, directional, or horizontal wells
  • Jar can be ran in compression or tension if required
  • Adjustable latch settings allow jar to be located throughout drill string. (Adjusted in shop prior to shipping)
  • Standard seals in the tool are effective to 275 degrees F (135 degrees C). Jars can be serviced with High Temperature seals effective to 500 degrees F or 300 degrees C
  • Jar is not effected by continuous firing , does not require long periods to cool down jars
  • Hydraulic delay while up jarring allows the operator to vary jarring force (impact) down hole by increasing or decreasing pull
  • Mechanical section of the jar and Hydraulic section are separately sealed from each other providing greater reliability
  • User friendly and durable design allows jars to be used in many applications if required, Coring, Fishing, Air drilling
  • In horizontal, or high angel wells if weight can be applied to jars they are effective in creating a impact

Operation

When jarring up apply overpull to overcome the latch setting, which initiates the hydraulic delay. During this hydraulic delay sequence the jar can be pulled harder if required which increases the impact force. See the Jar specifications to determine maximum pull during delay.

Pick up string weight above the jar + any hole drag above jar + Jar’s latch setting, the jar will now come out of latch.

Example; String weight above jars 120,000 lbs. + hole drag above jars 20,000 lbs. + Jar’s latch setting 85,000 lbs. = 225,000 lbs. required to pull jar out of latch and begin hydraulic delay.

After impact, apply a down force to close jar re-engage latch, then repeat jarring cycle if needed.

Jarring Down;

When jarring down apply weight to Jars to overcome Down latch setting and pump open force, at this point the latch will release in the jar allowing it to fire downwards.

Example; Slack off drill string overcoming latch setting, Down Lock setting 45,000 lbs. + pump open force (if pumps are on) 20,000 lbs. = 65,000 lbs. Jars will fire down.

After impact, pick up drill string to re-latch jars and repeat if needed.

Imperial

 

Nominal OD (inch)
Length (ft)
Inside Diam
Approx. Weight (lbs)
Pump Open Area (in2)
Torsional Limit (ft lbs)
Nominal Up Latch Setting (lbs)
Nominal Down Latch Setting (lbs)
Max Pull During Delay (lbs)
Tensile Yeild (lbs)
3.50 16-31 1.25 370 6.0 10,300 0-45,000 0-15,000 50,000 190,000
4.75 16-31 2.25 680 11.80 20,000 0-60,000 0-35,000 85,000 352,000
5.25 16-31 2.25 700 11.80 24,000 0-60,000 0-35,000 85,000 352,000
6.25 18-31 2.25 1,400 19.6 46,500 0-90,000 0-45,000 160,000 803,000
6.75 18-31 2.75 1,500 23.8 48,000 0-100,000 0-50,000 190,000 860,500
8.00 19-31 2.81 2,200 30.7 79,600 0-120,000 0-55,000 240,000 950,000
9.00 19-31 3.00 3,200 38.5 162,500 0-120,000 0-55,000 240,000 1,288,000

Metric

Nominal OD (inch)
Length (m)
Inside Diam
Approx. Weight (kg)
Pump Open Area (mm2)
Torsional Limit (N-m)
Nominal Up Latch Setting (daN)
Nominal Down Latch Setting (daN)
Max Pull During Delay (daN)
Tensile Yeild (daN)
89 4.9-9.4 31.8 170 3,900 14,000 0-20,000 0-14,800 22,200 84,500
121 4.9-9.4 57.2 300 7,600 27,100 0-26,000 0-15,500 37,800 156,600
133 4.9-9.4 58 650 7,600 33,100 0-26,000 0-15,500 37,800 180,500
159 5.4-9.4 57.2 630 12,700 65,800 0-42,000 0-20,000 71,200 357,200
165 5.5-9.4 57.2 660 12,700 71,000 0-40,000 0-20,000 71,200 357,200
171 5.5-9.4 69.9 700 15,300 66,200 0-45,000 0-22,000 84,500 382,800
203 3.0-9.4 71.4 1,000 19,800 108,000 0-50,000 0-25,000 106,700 422,600
229 3.0-9.4 76.2 1,400 24,800 220,300 0-50,000 0-25,000 106,700 572,900