Operator reaches stranded oil with horizontal reentry well drilled with coiled tubing and statically balanced mud weight - eliminates differential sticking and stuck pipe and expands access to mature reservoir

• Drill horizontal reentry well with coiled tubing → Cost effective drilling solution
• Coiled tubing drill ultra-slim hole → High ECD
• Wellbore stability requires high mud weight → High MW, high ECD
• Well control requires low static mud weight → Unstable boreholewith low mud weight
• High flow rate needed for hole cleaning → High ECD, high risk of differential sticking

• Reduce the overbalance by 1100 psi
• Drill with statically balanced mud weight
• Lower mud weight reduces ECD and allows high flow rate for good hole cleaning
• Apply backpressure while drilling to maintain wellbore stability
• Use Dynamic Annular Pressure Control system to control backpressure
• Use DAPC to actively manage BHP around-the-clock

NPT only 1.2% in 37 days of operation
Responded fast to unplanned loss of flow
Stabilized BHP with less than 0.02 psi/ft change in the EMW of 0.57 psi/ft (a 3.5 % change)
Reduced mud cost
Reduced formation damage
Controlled differential sticking and freed stuck pipe
Initial production 3 times greater than expected