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US 7,921,912 B2Granted
Non-acid acidizing methods and compositions
AssigneeHalliburton Energy Services, Inc.
InventorsRajesh K. Saini, Bradley L. Todd, David E. McMechan, Thomas D. Welton, Richard W. Pauls
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Abstract
Methods of acidizing subterranean formations or well bores, and more specifically, to acidizing systems involving acid-generating fluids that comprise acid-generating compounds and associated methods are provided. An example is a method that comprises: providing an acid-generating fluid that comprises an acid-generating compound; placing the acid-generating fluid into a subterranean formation; and allowing an acid to generate from the acid-generating fluid.
Claims13
A method comprising:
- providing an acid-generating fluid that comprises an acid-generating compound that comprises at least one acid-generating compound selected from the group consisting of:
- a poly(ortho ester);
- an orthoester;
- a poly(glycolide);
- a poly(ε-caprolactone);
- a poly(hydroxybutyrate);
- a poly(anhydride);
- an aliphatic polycarbonate;
- a poly(amino acid);
- a poly(ethylene oxide);
- a polyphosphazene;
- a derivative thereof;
- and a combination thereof;
- and a pH-adjusting agent, wherein the pH-adjusting agent controls the hydrolysis rate of the acid generating compound;
- placing the acid-generating fluid into a subterranean formation, wherein the acid-generating compound present in the acid-generating fluid is in liquid form;
- allowing an acid and an alcohol to generate from the acid-generating fluid;
- allowing the alcohol to mix with a fluid in the subterranean formation;
- and
- allowing the surface tension between that fluid and the subterranean formation to be altered.
16 more elements
A method comprising:
- providing an acid-generating fluid that comprises an acid-generating compound that comprises at least one acid-generating compound selected from the group consisting of:
- a poly(ortho ester);
- an orthoester;
- a poly(ε-caprolactone);
- a poly(hydroxybutyrate);
- a poly(anhydride);
- an aliphatic polycarbonate;
- a poly(amino acid);
- a poly(ethylene oxide);
- a polyphosphazene;
- a derivative thereof;
- and a combination thereof, wherein the acid-generating fluid does not comprise particulates;
- and a pH-adjusting agent, wherein the pH-adjusting agent controls the hydrolysis rate of the acid generating compound;
- placing the acid-generating fluid into a subterranean formation, wherein the acid-generating compound present in the acid-generating fluid is in liquid form;
- allowing an acid and an alcohol to generate from the acid-generating fluid;
- allowing the alcohol to mix with a fluid in the subterranean formation;
- and
- allowing the surface tension between that fluid and the subterranean formation to be altered.
15 more elements
A method comprising:
- providing an acid-generating fluid, wherein the acid-generating fluid is an emulsion that comprises an acid-generating compound that comprises at least one acid-generating compound selected from the group consisting of:
- a poly(ortho ester);
- an orthoester;
- an aliphatic polyester;
- a poly(lactide);
- a poly(glycolide);
- a poly(ε-caprolactone);
- a poly(hydroxybutyrate);
- a poly(anhydride);
- an aliphatic polycarbonate;
- a poly(amino acid);
- a poly(ethylene oxide);
- a polyphosphazene;
- a formate ester;
- ethylene glycol monoformate;
- ethylene glycol diformate;
- diethylene glycol diformate;
- glyceryl monoformate;
- glyceryl diformate;
- glyceryl triformate;
- triethylene glycol diformate;
- a formate ester of pentaerythritol;
- a derivative thereof;
- and a combination thereof;
- and a pH-adjusting agent, wherein the pH-adjusting agent controls the hydrolysis rate of the acid generating compound;
- placing the acid-generating fluid into a subterranean formation, wherein the acid-generating compound is in liquid form;
- and
- allowing an acid and an alcohol to generate from the acid-generating fluid,
- allowing the alcohol to mix with a fluid in the subterranean formation;
- and
- allowing the surface tension between that fluid and the subterranean formation to be altered.
28 more elements
Dependencies are inferred from the claim text.