In preparation for a proposed construction of surface and underground oil storage, an exploratory core drilling program was carried out. To meet local authority environmental constraints, the crude oil and petroleum products will be stored underground with only minimal surface tankage. Unlined underground rock caverns used for oil storage are dependent on the surrounding ground water pressure, which prevents oil seepage into the rock. It is therefore essential that the nature of the rock mass and its hydraulic and rock mechanical properties are known before a site is recommended and excavation begins. Core drilling was carried out to depths of up to 185 m. Cores of 35 mm dia. were produced from 14 holes drilled at a variety of angles. Core recovery was reported to have been 99 percent and many were recovered with the clay/sandstone interface intact in a single stick of core. The average drilling rate was close to 2 m per hour. It is anticipated that the rock caverns will have their roofs about 30 m below sea level and will have a total capacity of 20 million barrels of oil. Closed circuit TV explorations were conducted in addition to the core sampling. The video tapes were used for analysis and comparison with the core samples.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Publication Date: 1977-4

Media Info

  • Features: Photos;
  • Pagination: p. 26
  • Serial:
    • Volume: 10
    • Issue Number: 3
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00165947
  • Record Type: Publication
  • Report/Paper Numbers: Analytic
  • Files: TRIS
  • Created Date: Apr 26 1978 12:00AM