Spring Jar for fishing

We have a 2.5" OD toolstring stuck in 4-1/2" tubing. Two types of 2.5" spring jar from two different manufacturers have been used but the result is quite uncertainty:
Deviation: 46deg max, 34deg at fish.
Stuck depth 3500m.
Cable: 0.16" GD22.
Fluid inside the wellbore: mainly gas so hydraulic jar could not be used.
I am working in office, then actual operation is not very sure.

1. BHA01: RS+SJ+KJ+3ft stem + Spring Jar type 01 (setting 800lbs by manual gauge) + Spang Jar + HDPT: pick-up lower jar at 1,300lbs but could not fire the jar at 2,600lbs surface tension.
2. BHA01, reduce Spring Jar to 760lbs - minimum setting - could not fire. High friction could make it could not be fired.

3. BHA02: RS+SJ+KJ+3ft stem + Spring Jar type 02 (setting 580lbs by manual gauge) + Spang Jar + HDPT: lower jar open at 1600lbs cannot activate Spring Jar.
4. BHA02: Reduce setting to 480lbs, jar activated at 1900-2000lbs, but very poor performance while flowing the well (upper zone above the fish).
5. BHA02: Increase setting to 560lbs, jar activated at 2,300-2,400lbs at the beginning then increase to max 2,600lbs then stop working due to too high tension.

6. BHA03: Keep setting to 560lbs, but add 02ft stem, jar activated at 2,400lbs but seems to be poorer performance.

My questions:
1. The spring jar reliability is not so high and difficult to adjust the value? Could you please advise how to set spring jar correctly?
2. Can we use 2ft stem instead of 3ft? Should we add accelerator in the toolstring?
3. We plan to use 7/32" braided fishing cable or 15/32" three conductor braised cable for fishing, which one should we use? some of the clue:
3.1. Estimated weak point at cable head is 2,500 and 5,200lbs by simulation.
3.2. Max jar setting is 4,000lbs, but, not much change from 2,000lbs.
3.3. Hard to jar down to shear by using 15/32" cable.
3.4. WHP is more than 2,000psi, control pressure will be a big concern with 15/32" cable.
4. Should we use Stroker?
4.1. According to manufacturer, Spring jar could create 100,000lbs at 4,000lbs setting.
4.2 Stroker could create only around 60,000lbs static.  

Thanks so much for your help.

8 Answer(s)

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