Shell Oil Comapny

Jan Dirk Bossaerts

Reinoud Hendrik Jurgen Blok

Gerbrand Jozef Van Eijden

A tool and method are disclosed for injecting various treatment fluids into a formation surrounding an underground borehole. The tool comprises at least three axially spaced swab assemblies which define at least two annular spaces between the tool body and the wellbore. In use the tool is moved through the wellbore whilst a first treatment fluid such as a sand consolidation agent or production stimulation chemical, is pumped via a first annular space into the formation and a second treatment fluid, such as an overflush fluid, is pumped via a second annular space into the formation. The tool allows accurate and continuous injection of various treatment fluids over long intervals into the formation without requiring cycling to new fluids.

Apparatus and method of injecting treatment fluids into a formation surrounding an underground borehole

A method of treating an underground formation is provided, the method including sequential steps of: (a) contacting the formation with an aqueous medium; (b) contacting the formation with a hydrocarbon fluid; (c) contacting the formation with a solvent in the form of a glycol ether; (d) contacting the formation with a consolidation solution of between 30 and 60 % m of monomeric and/or polymeric organic polyepoxides having more than one epoxy group per molecule and between 5 and 20% m of a curing agent in the solvent; and (e) contacting the formation with a viscosified fluid containing aliphatic hydrocarbons.

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Volmerlaan, Netherlands

Jan Dirk Bossaerts