Oil Plus Ltd was formed in 1978 as a joint venture between British Petroleum (BP) and Plenty Ltd to provide process chemistry and engineering support services to the oil and gas industries. In 1982, BP sold its shareholding to Plenty's parent company Booker McConnell. Booker McConnell (re-named as Booker) gradually sold off divisions of the group and eventually sold Oil Plus Ltd to EIS, EIS was purchased several years later by TI Group who was then consolidated with Smiths Industries, which is now known as Smiths Group plc.

Smiths Group was founded in 1851 and currently employs around 22,000 people in over 50 countries with an annual turnover of around £3 billion. It has five operating divisions; Smiths Detection; Smiths Medical; John Crane; Smiths Interconnect and Flex-Tek.

Today Oil Plus is part of the John Crane Production Solutions division of Smiths Group, and operates as an independent consultant providing clients with world-class advice and guidance in:

• Designs for water treatment and injection systems in new field developments.
• Optimisation and cost minimisation for existing systems.
• Practical solutions arising from troubleshooting production and operations.
• Gas analysis and system design associated gas systems.

Oil Plus provides a complete service from the initial on-site investigation through modelling, analysis and evaluation to the provision of detailed technical recommendations or developed engineering solutions and designs. This is achieved by a team of highly skilled technical and engineering staff employed by Oil Plus, together with purpose built laboratories at its headquarters in Newbury, UK.