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Still John, Dismuke Keith, Frenier Wayne: Generating acid downhole in acid fracturing. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Sofitech, MENES Catherine, May 6, 2004: WO/2004/038176 (85 worldwide citation)

An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic aci ...


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Panga Mohan Kr, Gadiyar Balkrishna, Hartman Ryan, Drochon Bruno, Still John W, Stamm Bryan: System and method for low damage gravel packing. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Prad Research And Development, Panga Mohan Kr, Gadiyar Balkrishna, Hartman Ryan, Drochon Bruno, Still John W, Stamm Bryan, Cate David, November 26, 2009: WO/2009/141749 (14 worldwide citation)

A method is disclosed for low damage gravel packing. The method includes combining a carrier fluid, a first amount of particulates, and a second amount of particulates into a slurry. The first amount of particulates have a first average size distribution and the second amount of particulates have a ...


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Brown Ernest J, Still John W: Selective fracture face dissolution. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Brown Ernest J, Still John W, MITCHELL Thomas O, March 23, 2006: WO/2006/030383 (2 worldwide citation)

A method is given for acid fracturing a subterranean formation for improving the flow of fluids. The principal source, optionally the sole source, of the acid is a solid acid-precursor, optionally injected with an additional solid that is inert and that masks a portion of the newly created fracture ...


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Walton Ian C, Still John W, Fayard Alfredo, Woodburn Charles: Injection of a treatment material into a formation using a propellant. Schlumberger Holdings, July 18, 2007: GB2434167-A (1 worldwide citation)

In one implementation, a treatment material 95 may be disposed at the bottom of a well bore. One or more propellant apparatuses 40 may be immersed in the treatment material 95 and the propellant, delivered in a carrier 44, may then be burned inside the propellant apparatus 40 to create fractures in ...


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Brown J Ernest, Still John W, Fu Diankui, Xiao Zhijun: Differential etching in acid fracturing. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Brown J Ernest, Still John W, Fu Diankui, Xiao Zhijun, MITCHELL Thomas O, March 23, 2006: WO/2006/030397 (1 worldwide citation)

A method for fracturing a subterranean formation is provided in which inert masking material particles are injected into the formation with a dissolution agent so that the masking material inhibits dissolution where it contacts a portion of one or both fracture faces. The undissolved regions provide ...


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VICTORIO MARIELIZ GARCIA LOPEZ DE, STILL JOHN W, BUI TOAN: [en] System, method and apparatus for acid fracturing with scale inhibitor protection. SCHLUMBERGER HOLDINGS, March 17, 2010: GB2463437-A

[en] A method for treating a subterranean formation includes forming a treatment fluid including a carrier fluid, a solid acid-precursor, and a solid scale inhibitor. The solid acid- precursor includes a material that forms an acid at downhole conditions in the subterranean formation. The method fur ...


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COUILLET ISABELLE, STILL JOHN W: [en] Methods and compositions for selectively dissolving sandstone formations. SCHLUMBERGER HOLDINGS, August 11, 2010: GB2467625-A

[en] In a method of treating a sandstone-containing subterranean formation penetrated by a wellbore, a slurry of a carrier fluid containing a surface modification agent of at least one of a hydro lyzable organosilicon compound, a phosphonate compound or a combination of these is formed. The slurry i ...


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STILL JOHN EDWARD: [en] An Improvement in Swimming Baths.. STILL JOHN EDWARD, October 29, 1898: GB189728490-A

[en] 28,490. Still, J. E. Dec. 2. Blocks for baths. The upper edge of the bath is built of blocks of the section shown of enamelled iron or glazed earthenware. The bead b forms a hand-rail and the channel a carries off the scum. The upper edge of the block is made to overhang and hide the channel. T ...