Ithaca Energy (UK) Ltd v North Sea Energy (UK) Ltd (Rev 1)

Whether an oil well is an appraisal well depends on its primary or predominant purpose. That purpose is assessed objectively from what the participants communicated when deciding to drill. Descriptions such as “production well” or “appraisal well” are relevant evidence but are not conclusive. Appraisal activity may occur after development or production has begun, and the contractual right to opt out is not limited to pre-development drilling unless the agreement clearly says so. A well is not converted into an appraisal well merely because it targets contingent resources or involves geological uncertainty. Where the project is approved as a single operation intended to be completed and used for production, its primary purpose is production rather than appraisal.

The claimant and defendant participated with Dyas UK Ltd in the Jacky oil field under a Joint Operating Agreement. The defendant sought to exercise a contractual right not to contribute to the cost of drilling Well J03. That right applied only if the well was an appraisal well within clause 14.2.2(ii)(d) of the Agreement.

The proposed well was described in contemporaneous documents as a second production well. The defendant argued that its purpose was to evaluate geological uncertainty and the commercial viability of further investment, and alternatively that it targeted contingent resources. The claimant argued that it was a production or development well. The central issue was the proper contractual characterisation of Well J03.

1. Construction of the contractual test. The relevant question was the primary or predominant purpose for which Well J03 was to be drilled. That purpose was to be assessed objectively from what Ithaca and Dyas communicated when making the decision. The Operating Committee’s label was not determinative, although contemporaneous descriptions could provide evidence of the parties’ purpose.
2. Appraisal was not confined by timing. The Agreement did not prevent appraisal activity, including appraisal drilling, after development consent or production had begun. Clause 14.9 specifically disapplied clause 14.3 for non-consented drilling and required the relevant description in clause 14.2.2(ii) to be assessed without references to Sole Risk Drilling. The contractual scheme therefore permitted a qualifying appraisal well to be the subject of non-consent in a developed field.
3. Contingent resources were not the test. Whether the target comprised proved reserves or contingent resources did not determine whether a well was an appraisal well. That approach could produce the anomalous result that a well intended from the outset to be completed and placed into production was nevertheless classified as appraisal merely because the least favourable economic case was not profitable.
4. Application and result. The contemporaneous proposals, Work Programme and Budget, and AFE authorised one operation comprising drilling and completion as a producer. They did not provide for an initial information-gathering stage, a pause for analysis, or a later decision whether to complete the well. All economic cases contemplated completion and production, even where production would merely recoup part of the costs. Well J03 was therefore a development or production well, not an appraisal well within clause 14.2.2(ii)(d). NSE was not entitled to opt out of its share of the costs. Judgment was entered for Ithaca on the declaration sought.