Predictability of well construction time with multivariate probabilistic approach

LUU Quang-Hung,LAU Man Fai,NG Sebastian P.H.,TING Clement P.W.,WEE Reuben,THEN Patrick H.H.

Table 1 Summary of 414 operations in the drilling database with respect to different category classification.

Category Classification Total number Used wells Percentage of used wells/% Percentage of used wells by category/% Well type Development 152 68 45 35 Exploration 66 53 80 28 Production 191 69 36 36 Others 5 2 40 1 Drilling type Offshore 410 192 47 100 Onshore 4 0 0 0 Region Australia 380 176 46 92 Asia 26 13 50 7 Unknown 8 3 38 1 Rig type Semi-submersible 127 100 79 52 Drillship 28 20 71 10 Others 14 0 0 0 Unfilled 245 72 29 38 Spud year 1996 4 0 0 0 2006 7 7 100 4 2007 30 23 77 12 2008 42 22 52 11 2009 35 16 46 8 2010 34 21 62 11 2011 34 15 44 8 2012 30 17 57 9 2013 15 3 20 2 2014 22 7 32 4 2015 39 11 28 6 2016 29 10 34 5 2017 29 18 62 9 2018 52 20 38 10 2019 12 2 17 1