I am sorry for late coming back on this issue since we were busy; including fishing another fish successfully and temporarily suspended the job for better preparation. I would like to update some information on this particular fish only and what I have been observed:
1. We used to run 15/32” braided line in 2000psi wellhead pressure gas and huge amount of grease has been used to make it seal and messy oil on the deck. Combination of (i) bigger strand / bigger space among the strands (ii) new cable, (iii) quality of cable, (iv) tolerance of flowtube ID vs Cable OD, (v) new cable seasoning before using.
2. It is very good idea for detail drawings / diagram of LIH toolstring and completion item / spacing for better understanding of stuck mechanism.
1. Yes, jarring up is the only choice to recovered the fish, we have min ID 3.26” in the LBFV just below.
2. We check the tension simulation of 7/32” and 15/32” and jar setting impact, the different is around 20.000lbs but it is in the top range of spring jar effect then I believe that actually might not as high then 7/32” should be selected.
3. I am noted of Petroline Spring jar and I got the same advice from other friends.
4. Regarding the oil jar: since it is not the seal loop system, if working in gas then gas will migrate into the chamber of the oil jar then it will not work anymore, even it works like shock absorber then you could not have good jar down impact to release pulling tool if required.
5. We could cut the tailpipe to drop fish to rat hole by mechanical tubing cuter from Sondex/GE, Baker or Welltec since the pressure is balanced after tubing puncher.
6. Mr. Giang is fine since we do not have much thing to do at the moment, I will send your message to him.
I have some comments on the job for your review:
1. Bigger tool, higher setting force - is it good design for spring jar?
a. As I mentioned before, 2.5” OD string jar working very poor and unstable at setting of 600-800lbs, maybe in the lowest range, however we feel strong effect of 1-7/8” spring jar. But thanks to 0.16” cable with 2,600lbs pulling weight, not 0.125” cable.
b. Standard cable for fishing is 0.125”. Max allowable pulling weight of 0.125” cable is 1,800lbs - why 2.5” spring jar have fix setting range from 500-4000lbs, more or less? It is really hard to have overpull against the spring jar at 3000m with, let´s say, 1000lbs to fire a jar?
c. Should the manufacturer provide some sets of accessory to work at certain force setting range that match with well condition in order to get the best impact? I requested the service provider to discuss with manufacturer but not yet have their feedback.
2. We observed that 3ft stem above spring jar get better impact than 5ft stem of 2.5” OD string. We not yet have chance to check with 2ft stem or with accelerator. That is also recommended in the Schlumberger slickline manual. However, some test on the surface for one of the spring jar say longer stem is better which should be true since no cable and no friction as downhole.
3. We are struggling with toolstring OD: with 4-1/2” tubing, 12.6#, should we use 2.5” OD toolstring or less? With total weight of around 100kg, pick-up eight of 2.5” is around 200lbs higher than 1-7/8” making me cannot understand why, but simulation says almost the same. Can you give me some advice on the toolstring length?
Thanks for your advice.