Solutions to surface collision issues

22 March 2015 Dear Members, 
I am currently facing problems for planning offshore wells due to collision issues at surface (<1000 ft). This has became more difficult due to revised anti-collision policy set by company recently. 
For eg: at one of the well 30" conductor is planned to set at 300 ft (sea bed at 145 ft) considering zero degree inclination at shoe. Further directional plan is optimized to get minimum center to  center distance of 6 ft (from offset well) at 358 ft with kick off planned at 310 ft and max. build angle 1.64 deg. However the plan was discussed with directional company and found that it is really critical plan to achieve due to very less CC distance and high risk of collision. 
In order to avoid above issue we are looking for other options such as; 

• Landing 30" conductor at 300 ft with 2 to 3 deg inclination which would increase the CC distance at critical depth.
• we generally drill 26" hole vertical to 300 ft and later open it to 36" hole opener and run 30" conductor in vertical. 
  

Question is;

1. How to drill to 300 ft (from seabed i.e 147 ft) to get min. 2 deg inc. ?
   
2. and what is risk involved in running 30" conductor to 300 ft with inclined hole w/ inclination upto 2 deg ?
3. is there any other option available ? 
   

Your response in this regard will be really helpful.
Regards
Bhushan

8 Answer(s)

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