Dailey® Hydraulic Drilling Jar

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 fast with a return 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

OD (in./mm) 4-3/4 4-3/4 6-1/4 6-1/2 7 7-3/4 8 9-1/2
ID (in./mm) 2-1/16 2-1/4 2-1/4 2-3/4 2-3/4 3 3 3
Tool joint size (API) NC-38,
3 1/2-in. IF
NC-38,
3 1/2-in. IF
NC-46,
4 1/2-in. XH
NC-50,
4 1/2-in. IF
5 1/2-in. FH 6 5/8-in.
стандарт.
6 5/8-in.
стандарт.
7 5/8-in.
стандарт.
Tensile yield* (lbf/kN) 436
1939
500
2224
832
3701
934
4155
1200
5338
1600
7117
1750
7784
2300
10231
Torsional yield* (lbf-ft/kN•m) 21,2
28,7
20,0
27,1
49,3
66,8
56,2
76,2
76,4
103,6
76,4
103,6
105,0
142,4
160,0
216,9
Maximum overpull up/down (lbf/kN) 95
423
85
378
200
890
175
778
220
979
260
1157
300
1334
500
2224
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) 1200
544
1200
544
2050
930
2400
1089
3000
1361
3500
1588
3800
1724
5500
2495
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

*Tensile and torsional yield values are calculated per API RP7G, based on nominal dimensions and the published yield strength of the material and do not constitute a guarantee, actual or implied.

Pump-open force is created by pressure drop across the bit. The pump pressure creates a reaction force in the tool that tries to force it open. Reduce the pump to idle before attempting to jar.