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:: Workover and CompletionTo Advertise your company Click here :: Workover Fluids :: Decommisioning wells Author Topic: Decommisioning wells (Read 3,386 times) jimgambia Member member is offline Joined: Sept 2004 Gender: Male Posts: 1 Decommisioning wells « Thread Started on Sept 19, 2004, 1:50pm » When decommisioning wells with a bentonite powder / cement mix is there a rule of thumb to the mixture levels. The wells in question are 100m deep & 10inch diameter. going off research in the US I have been advised to use a 5% bentonite to cement mix, whereas in the UK they use up to a 50% cement to bentonite mix. I know from past usage that a wallpaper paste type mix is ideal, but what mix is this ? Regards, Jim. Link to Post - Back to Top   Logged RobinDavies Leading Member member is offline Around the World Around the Clock Joined: Mar 2003 Gender: Male Posts: 1,584 Location: Brisbane,Queensland,Australia Re: Decommisioning wells « Reply #1 on Nov 26, 2004, 8:53pm » Dear Jim, You may wish to look at the October & November 2004 issues of National Driller respectively: - Grouting & Sealing Materials versus Cost - pp.56 & 67 (+ letter to editor pp. 4) - Monitoring Well Abandonment - pp.28 & 30. I receive the newspaper by mail and am not sure if copies are available at www.drilleronline.com I note Type II cement (similar to API Class B - lower heat of hydration than Type I & sulphate resistant) with 2 - 5% bentonite & mix water in accordance with ASTM C150-92 is discussed for wells greater than 200 feet. Hopefully the articles will assist you further although there is nothing about UK regulations. Best regards, RAD. 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