US 4,085,801 A · Control of incompetent formations with thickened acid-settable resin compositions

Abstract

A method and composition is provided for positioning a polymeric material having particulate matter disposed therein in a subterranean formation penetrated by a wellbore. The composition consists essentially of a hydrocarbon oil, a quaternary salt of an essentially undegraded, cellulose sulfate, solid particulate matter in an amount equal to from about 0.25 to about 22 pounds of particulate matter per gallon of hydrocarbon oil and an acid-settable thermosetting resin in an amount equal to from about 0.1 to about 5.0 gallons per cubic foot of particulate material. The composition is placed in contact with a subterranean formation in a wellbore by a method comprising injecting a first mixture consisting essentially of said quaternary salt of an essentially undegraded cellulose sulfate mixed with hydrocarbon oil followed by the injection of the composition with a post injection of an additional quantity of the quaternary salt in oil.

Claims17

Dependent claims

In a method for controlling an incompetent formation comprising:

(a) admixing to form a mixture consisting essentially of an acid-settable liquid thermosetting resin, a substantially neutral hydrocarbon oil, and an oil soluble acidic catalyst;
and
(b) positioning the mixture in contact with the incompetent formation;
the improvement comprising:
incorporating in the mixture of (a) sufficient of a quaternary ammonium salt of cellulose sulfate, a quaternary group of said quaternary salt of cellulose sulfate containing at least 16 carbon atoms, to produce a minimum apparent viscosity in the mixture positioned in contact with the incompetent formation of at least 50 cps, but less than 5000 cps at the temperature and pressure prior to positioning and an apparent minimum viscosity at conditions in the locus of the incompetent formation of at least 25 cps.

2 more elements

A method for positioning an acid-settalbe polymeric material having particulate material disposed therein into contact with a subterranean formation penetrated by a wellbore, said method consisting essentially of:

(a) mixing a substantially neutral hydrocarbon oil with a quaternary ammonium salt of cellulose sulfate to produce a gelled oil mixture, the quaternary group of said quaternary salt of cellulose sulfate containing at least 16 carbon atoms and being present in said gelled oil mixture in an amount sufficient to produce a minimum apparent viscosity in said gelled oil mixture of at least 50 cps but less than 5000 cps at the injection temperature and pressure and an apparent minimum viscosity at bottom hole conditions of at least 25 cps;
(b) injecting an effective amount of said mixture into said formation;
(c) mixing a substantially neutral hydrocarbon oil with said quaternary salt of cellulose sulfate, finely-divided solid particulate material in an amount equal to from about 0.25 to about 22 pounds of said particulate material per gallon of said oil and an acid-settable, liquid thermosetting resin in an amount equal to from about 0.1 to about 5.0 gallons of resin per ft.sup.3 of said particulate material to form an injection composition;
(d) positioning said injection composition into contact with said formation;
(e) mixing a substantially neutral hydrocarbon oil with a quaternary ammonium salt of cellulose sulfate to produce a second gelled oil mixture, the quaternary group of said quaternary salt of cellulose sulfate containing at least 16 carbon atoms and being present in said second gelled oil mixture in an amount sufficient to produce a minimum apparent viscosity in said second gelled oil mixture of at least 50 cps but less than 5000 cps at the injection temperature and pressure and an apparent minimum viscosity at bottom hole conditions of at least 25 cps;
(f) injecting an effective amount of said gelled oil mixture of step (e) into said wellbore.

3 more elements

Dependencies are inferred from the claim text.

Control of incompetent formations with thickened acid-settable resin compositions

Life of this patent

Control of incompetent formations with thickened acid-settable resin compositions

Life of this patent

Abstract

Claims17