Internal breakers for viscoelastic surfactant fluids

Details Internal breakers for viscoelastic surfactant fluids Internal breakers for viscoelastic surfactant fluids

C - Chemistry, Metallurgy

09

K

C09K 8/52 (2006.01) C09K 8/575 (2006.01) C09K 8/68 (2006.01) C09K 8/74 (2006.01) E21B 43/22 (2006.01)

Patent

CA 2724080

Internal breakers are given that break fluids viscosified with non-polymeric viscosifiers such as viscoelastic surfac-tants, inside formation pores. The breakers are polyols, for example natural and synthetic sugars, monoalcohols, and mixtures of the two. The sugars may be ketones and aldehydes. The sugars are also breaker aides for oxidizing agents used as breakers. Meth-ods of using the breakers and breaker aides in oilfield treatment fluids are given.

La présente invention concerne des agents de rupture internes capables de rompre, à l'intérieur des pores des formations, la continuité de fluides rendus visqueux au moyen d'agents de viscosité non-polymères tels que des tensioactifs viscoélastiques. Ces agents de rupture sont des polyols, par exemple, des sucres naturels et synthétiques, des mono-alcools, et des mélanges des deux. Les sucres peuvent être des cétones et des aldéhydes. Ces sucres conviennent également comme auxiliaires d'agents de ruptures dans les cas où l'on se sert d'agents d'oxydation comme agents de rupture.

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