Exploration activity bounced back in 2018 but declining performance points to the limitations of the global exploration drilling opportunity set and the urgent need for its renewal in 2019 and beyond.
This is the key finding of Westwood’s 10th annual ‘State of Exploration’ report which reviews global conventional exploration over the last five years and looks ahead at the prospects for 2019.
Global exploration drilling is on the rise after the cutbacks triggered by the 2014 oil price crash and the lows in activity reached in 2017. In the downturn success rates had increased as companies high graded their portfolios to ensure that only the best prospects were drilled. Unfortunately, this didn’t last, and 2018 saw discovered volumes, average discovery size and success rates all decline.
Discovered volumes from high impact drilling fell overall by 50% in the 2014-2018 period compared to the previous five years. Only a little over half of the decline can be accounted for by a lower well count which fell by 28%; falling success rates and average discovery sizes accounted for the rest. Portfolio renewal has become a critical issue for the industry and larger companies have responded by trying harder to open new plays through increased frontier drilling.
Frontier exploration, however, is not easy, and over the last five years only nine potentially commercial new plays have been opened with a success rate of just 6%. Three of those plays lie within one block, offshore Guyana. Working frontier plays show an increasing proportion of stratigraphic traps and appear to be smaller scale than previously, with only the Upper Cretaceous clastic play of the Guyana-Suriname basin showing the potential to deliver more than 5bnboe and most plays levelling off at around 1bnboe. This is limiting industry exploration performance and concentrating material success in a small number of companies.
With oil companies planning to increase exploration drilling in 2019, the question is whether the global drilling portfolio for both near-field and high impact prospects is strong enough to sustain an increase in activity without sacrificing exploration performance.
The State of Exploration Report analyses global conventional exploration performance over the past five years, together with exploration drilling plans for 2019. The analysis covers all high impact and frontier drilling by the industry, the key discoveries of 2018, the key plays explored and all frontier drilling. Exploration performance trends have been analysed using a benchmark group of 36 international E&P companies that participated in 756 conventional wildcat wells between 2014 and 2018, drilled at a cost of $28.3bn and discovering 22.4bnboe of oil and gas.
- In 2018 the industry pursued a twin track exploration strategy, increasing short cycle ILX drilling in mature plays by 40%, whilst maintaining a 65-well high impact drilling programme with a greater emphasis on high impact frontier drilling, increasing frontier play tests to 29 wells from 22 in 2017. Exploration drilling activity increased by nearly 30% overall in 2018 compared to 2017.
- Total commercial volumes from high impact drilling decreased to 5.4bnboe from 9.4bnboe in 2017 due to smaller average pool sizes, although more 100mmboe+ discoveries were made. Overall commercial success rates were down to 33% in 2018 from 48%, reversing a three-year rising trend due primarily to lower infrastructure-led exploration (ILX) success rates from a higher well count. Exploration drilling-only finding costs remained below $1/boe.
- The search for new frontier plays remains a challenge and the commercial success rate for frontier exploration over the last five years has been just 6%, opening nine new plays from 154 wells at a cost of $11 billion. Two new plays were opened in 2018 but these were both in the same block as the last significant frontier discovery, in Guyana. Recent emerging oil plays appear to have limited “running room” with only the Guyana plays indicating the potential to exceed 5bnbbl.
- The continuing large gap between technical and commercial success rates in very high- risk wells points to a persistent over estimation of volumes pre-drill, with only 15% of discoveries over the last five years in the very high-risk category being deemed commercial. Few companies with significant levels of production have been able to replace produced reserves by exploration alone.
- In 2019, high impact drilling is forecast to increase by 20% to around 80 wells, with more high impact wells planned in maturing and mature plays, especially in NW Europe and Mexico. Total is leading the way with high impact wells in 2019 planning at least 20 wells. Frontier drilling is being maintained at around 30 wells. High impact exploration had already delivered 2.4bnboe by the end of Q1 2019 and the total risked drill-out for 2019 is potentially 40% higher than the volume discovered in 2018.
Graeme Bagley, Head of Global Exploration and Appraisal