Dailey Hydraulic Drilling Jar

Contact

Weatherford’s Dailey hydraulic drilling jar (HDJ) is a double-acting hydraulic jar designed for simple operation, variable hitting loads, and extended periods of continuous jarring in a wide range of drilling conditions.

Using a patented hydraulic time-delay/mechanical-release system, the HDJ combines downhole reliability and long operating life under a wide range of drilling conditions and hostile environments.

Applications

  • High-angle drillstrings
  • All conventional oil and gas wells
  • Deviated oil and gas wells

Features, Advantages and Benefits

  • The one-piece involute spline mandrel provides maximum torque with minimal backlash to ensure effective transfer of drillstring torque through the HDJ. Full torque in either direction can be transmitted at all times without affecting the magnitude or the time delay of the jarring operation. The splines and all other working parts of the tool are enclosed within the hydraulic chamber, where they are fully protected and lubricated.
  • A fluid-isolated, high-pressure chamber lubricates and isolates the HDJ’s moving seals, impact shoulders, and mandrel from downhole debris, protecting the HDJ’s operational integrity.
  • The HDJ is virtually unaffected by downhole temperatures and generates very little heat when in use. The result is a consistent time delay to trip the HDJ, even in deep, high-temperature holes.
  • The design of this tool allows for zero bleed-off during jarring; therefore the driller does not have to apply any compensation to the brake load.
  • Overpull is controlled at the surface, enabling the driller to increase or decrease the impact to the stuck point by simply increasing or decreasing the load applied to the jar.
  • The hydraulic metering mechanism of the HDJ has no moving parts; it incorporates large flow paths and is protected from contamination.
  • Recocking is done quickly by returning to neutral and jarring again in either direction.
  • All connections are torqued to the charted makeup torque to ensure no accidental back-offs downhole.

 

 

 

Specifications

Circulating pressure (psi/bar) 5,000
345
Hydrostatic pressure (psi/bar) None
OD (in./mm) 4-3/4
120.65
4-3/4
120.65
6-1/4
158.75
6-1/2
165.10
7
177.80
7-3/4
196.85
8
203.20
9-1/2
241.30
ID (in./mm) 2-1/16
52.39
2-1/4
57.15
2-1/4
57.15
2-3/4
69.85
2-3/4
69.85
3
76.20
3
76.20
3
76.20
Tool joint size (API) NC-38,
3-1/2 IF
NC-38,
3-1/2 IF
NC-46,
4-1/2 XH
NC-50,
4-1/2 IF
5-1/2
FH
6-5/8
Reg.
6-5/8
Reg.
7-5/8
Reg.
Tensile yield*
(lbf/kN)
436,000
1,939
500,000
2,224
832,000
3,701
934,000
4,155
1,200,000
5,338
1,600,000
7,117
1,750,000
7,784
2,300,000
10,231
Torsional yield*
(lbf-ft/kN•m)
21,200
28.7
20,000
27.1
49,300
66.8
56,200
76.2
76,400
103.6
76,400
103.6
105,000
142.4
160,000
216.9
Maximum overpull up/down
(lbf/kN)
95,000
423
85,000
378
200,000
890
175,000
778
220,000
979
260,000
1,157
300,000
1,334
500,000
2,224
Approximate length
extended (ft/m)
32
9.8
32
9.8
33
10.1
33
10.1
33
10.1
33
10.1
33
10.1
33
10.1
Approximate weight
(lb/kg)
1,200
544
1,200
544
2,050
930
2,400
1,089
3,000
1,361
3,500
1,588
3,800
1,724
5,500
2,495
Free-travel up/down
stroke (in./mm)
5.00
127
5.50
140
6.25
159
6.50
165
6.50
165
7.00
178
7.00
178
7.00
178
Total stroke (in./mm) 13.50
343
15.00
381
16.50
419
17.00
432
17.00
432
19.50
495
19.50
495
19.50
495
Maximum bottomhole
temperature (°F/°C)
400°
204°
Pump-open area (in.2/cm2) 9.6
61.9
10.3
66.5
15.9
102.6
19.6
126.5
23.8
153.5
28.3
182.6
28.3
182.6
38.5
248.4