Composition and method for diversion agents for acid...

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) E21B 43/267 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2530584

Solid, particulate dicarboxylic acids are useful as diverting agents in methods for acidizing subterranean formations to improve the uniformity of the acid treatments (acid displacement) by diverting acid to intervals of relatively less permeability. Particularly suitable solid, particulate dicarboxylic acids include, but are not necessarily limited to, those insoluble in both aqueous and hydrocarbon liquids, but which are soluble in mutual solvents or alcohol blends. These acids may have melting points of about 82~ to about 149~C, formula molecular weights of from 146 to 400, and mesh sizes of from about 20 mesh to about 400 mesh (about 841 to about 38 microns). Particular dicarboxylic acids that fit this description include, dodecanedioic acid, undecanedioic acid, decanedioic acid, azelaic acid, suberic acid, and mixtures thereof.

Il a été découvert que des acides solides particulaires dicarboxlyiques sont utiles comme agents de déviation dans des procédés d'acidification de formations souterraines afin d'améliorer l'uniformité des traitements par acide (déplacement acide) par déviation d'acide vers des intervalles de perméabilité relativement moindre. Les acides solides particulaires dicarboxyliques particulièrement appropriés comprennent, de façon non exhaustive, ceux insolubles dans des liquides à la fois aqueux et à hydrocarbure, mais qui sont solubles dans des solvants ou des mélanges d'alcools mutuels. Ces acides peuvent avoir des points de fusion allant d'environ 180 à environ 300 ·F (environ 82 à environ 149 ·C), des masses moléculaires de formule allant de 146 à 400 et des grosseurs de maille allant d'environ 20 mailles à environ 40 mailles (environ 841 à environ 38 microns). Les acides dicarboxyliques particuliers convenant à cette invention comprennent, de façon non exhaustive, l'acide dodécanedioïque, l'acide undécanedioïque, l'acide décanedioïque, l'acide azélaïque, l'acide subérique et des mélanges de ceux-ci.

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