The Marriott Drilling Group is the largest deep onshore deep drilling company based in the United Kingdom operating 19 drilling and workover rigs and a wide range of drilling and associated services to the oil, gas, shale gas, gas storage, coal, CBM, mining, water and geothermal industries and for specialised geoscientific drilling projects in Europe and selected international markets.
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The late Richard Marriott, grandfather of three of the management team in the Marriott Group today, started the company in 1947. Richard Marriott, an agricultural engineer, was interested in geology and developed his ability to locate water resources around his home in Derbyshire, England. He was an innovative and skilled engineer and built his first drilling rig to provide water for his own home and nearby water users in the 1940s. During his lifetime, Richard Marriott drilled over 2000 wells in England and Wales.

He also had an aptitude for designing equipment for particular applications and, in the 1970s, he designed and patented an eccentric bit for drilling and casing wells simultaneously through overburden and unconsolidated formations of a type which revolutionised the shallow drilling business worldwide. He also developed casing jacks up to 800 ton capacity for extracting casing and participated in the development of down-hole-hammer technology.

Richard Marriott set the highest standards of equipment maintenance and customer satisfaction, characteristics which are key factors in the culture and success of the company today.

The Marriott Group expanded from water resources into oil and gas business in the late 1990s both as drilling contractor and participation in an oil exploration and development programme in Belize, Central America. Marriott was instrumental in discovering the first oil in Belize and helping to develop the oilfield designing and constructing all the infrastructure for production and exportation of the oil.

Today, the Marriot Group offers a range of services to the oil, gas, gas storage, shale gas, geothermal, mining, geoscience, coal and water industries.