Schlumberger

Technical Paper: 12.25 in. Hard Rock Drilling in Oman Performance Drilling

Society: SPE
Paper Number: 173830
Presentation Date: 2015
 Download: 12.25in Hard Rock Drilling in Oman Performance Drilling (6.24 MB PDF) Login | Register

 

Abstract

Petroleum Development Oman (PDO) "M" gas field provides an unique set of challenges while drilling the 12.25 in. intermediate hole section which include severe lateral vibrations, stick & slip, impact damage, limited bit life and low penetration rates. As a result, 3 BHA's were historically needed to complete the section totaling 16 days on average. A collaborated effort between Schlumberger and PDO was initiated, with the ultimate goal to reduce the number of days to drill the section. To achieve this goal a Petro Technical Engineering Center (PTEC) process was established to develop a system engineered BHA solution. This process was introduced to the field over several wells and resulted in drilling the entire section in one run and reducing the drilling time from 16 to 7 days.

The well profile is a 12.25 in. vertical hole typically drilled from +/- 1000m to +/-3400m MD, through highly interbedded formations ranging from 5-30 kpsi UCS and varying levels of abrasiveness. In a hard rock environment a system engineered approach is valuable to reduce the number of design iterations required compared to a trial and error method, due to the significant amount of time a well takes to drill. To complete this, a three phased approach was executed.

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