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US 2007/0191234 A1Published application
Surfactant package for well treatment and method for using same
AssigneeIntevep, S.A.
InventorsManuel Mas, Alicia Colina, Williams Aular
Life of this patent
Estimating the term…
Abstract
A surfactant blend for servicing wells includes a first non-ionic surfactant having a hydrophilic-lipophilic balance of between about 10 and about 15; a second non-ionic surfactant having a hydrophilic-lipophilic balance of between about 2 and about 6; and an anionic surfactant.
Claims6
1-14. (canceled)
A method for removing an oil based fluid mud cake from a well wall, comprising the steps of:
- providing a well defined by a well wall and having an oil based mud cake on the wall;
- and
- exposing the mud cake to a surfactant blend comprising a first non-ionic surfactant having a hydrophilic-lipophilic balance of between about 10 and about 15, a second non-ionic surfactant having a hydrophilic-lipophilic balance of between about 2 and about 6, and an anionic surfactant;
- whereby the surfactant blend changes wettability of solids in the mud cake and forms an emulsion with oil from the mud cake.
1 more element
19-22. (canceled)
Dependencies are inferred from the claim text.