Core Completions was established to address the specific challenges born out of an industry battling low oil prices.

In this difficult climate clients cannot afford to compromise on the quality of work but require a fresh, forward-thinking and cost effective approach by which it can be delivered.

Our unique operating model allows the business to run with low overheads and yet still offer clients high-quality and effective solutions based upon their individual requirements.

We are based in central London and ready to support clients globally.


Core Completions approach is client led and trades upon utilising both our in-house completion expertise and our established global network of associates.

We effectively blend project management, design, engineering, planning and operations in order to offer tailored solutions to clients on a consultancy basis.


Dan Ellison
Founder & Director

Brian Teggart
Non-Executive Director

A team that can deliver. We design, engineer and execute your completions to maximize your production ramp-up for a lower net cost.

Dan’s early career was spent with Chevron working as a Completion Engineer in Aberdeen before relocating to work on projects in Angola. Since his return to the UK Dan has consulted for Tullow Oil, Premier Oil, Eon, BP and Sasol in London establishing a reputation as a technical authority in all aspects of Completion Engineering.

2020 has heralded a decade of unprecedented change globally and the impact on the oil and gas industry has been huge with negative oil prices seen for the first time. These new challenges drove Dan to develop a new on-demand consultancy model to meet reformed market demand. Dan has built a strong team and worked together with London Business School to develop the new model.

Dan has actively managed all Core Completions projects personally and is passionate about all aspects of completion design, engineering and operations.