Total spudded exploration well 30/12d-11 in licence P1820 on 13 October 2019 targeting the Isabella prospect. The HP/HT (12,960 psi and 175 degrees centigrade) gas condensate prospect is located on one of the largest undrilled fault blocks in the Central North Sea and is thought to hold pre-drill estimated resources of 142 MMboe. The well was drilled with the Noble Sam Hartley (J/U). On 11 March 2020 Total confirmed that it was plugging and abandoning the well.  The Isabella trap is formed by closure on a salt pierced anticline. The reservoir target is the Triassic Joanne and Judy Sandstones. The well which is planned to be slightly deviated has an estimated TD of 5,607 m and dry hole cost of GBP 57 million (125 day well).  P1820 was awarded in the 26th Offshore Licensing Round to Valiant and Apache North Sea Ltd. On 23 September 2013 Ithaca announced that it has agreed to farm down a 10% interest in licence P1820 (blocks 30/6b, 30/11a and 30/12d) to Edison subsidiary EDF Production UK Limited in return for a cash payment. It was confirmed that the deal completed on 31 December 2013. On 13 August 2018 Neptune announced that it had agreed to acquire Apacheâs interest in the licence and then late 2018 / early 2019 the operatorship was transferred over to Total.  Interest in P1820 is held by Total E&P North Sea UK Limited (30% + operator), Neptune E&P UK Limited (50%), Edison subsidiary, Euroil Exploration Limited (10%) and Ithaca Energy (UK) Limited (10%).
030/12d-11 (Isabella) - P1820  Total (30% + Op), Neptune 50%, Delek subsidiary Ithaca Energy UK Ltd 10%, EDF (Edison) via subsidiary Euroil Exploration Ltd 10%) Kimmeridge U Jurassic reservoir: 10m net gas pay, Trias Joanne reservoir : 30 m net pay