A method includes disposing a device into a borehole in proximity to a subterranean formation where a filter cake has been formed adjacent thereto, the device comprising a support structure and a shape-memory article disposed at the support structure, the shape-memory article comprising a shape-memory polymer, wherein the device is disposed when the shape-memory article is in a compacted shape; exposing the shape-memory article to a fluid system to cause the shape-memory article to expand and conform to a surface of the borehole; exposing the filter cake to the fluid system; and removing the filter cake with the fluid system. The fluid system comprises (i) an acid component, a chelating agent, or a combination thereof; (ii) an activator, (iii) a viscosifier, (iv) water or a brine, and (v) optionally a surfactant.

A method includes disposing a device into a borehole in proximity to a subterranean formation where a filter cake has been formed adjacent thereto, the device comprising a support structure and a shape-memory article disposed at the support structure, the shape-memory article comprising a shape-memory polymer, wherein the device is disposed when the shape-memory article is in a compacted shape; exposing the shape-memory article to a fluid system to cause the shape-memory article to expand and conform to a surface of the borehole; exposing the filter cake to the fluid system; and removing the filter cake with the fluid system. The fluid system comprises (i) an acid component, a chelating agent, or a combination thereof; (ii) an activator, (iii) a viscosifier, (iv) water or a brine, and (v) optionally a surfactant.

This invention presents a novel corrosion inhibitor. In the preferred embodiment, the inventive corrosion inhibitor comprises extracellular polymeric substances (EPS). In one embodiment, the invention presents a novel EPS corrosion inhibitor using waste activated sludge (WAS). In this embodiment, WAS is heated to release EPS from the microbial mixture.

This invention presents a novel corrosion inhibitor. In the preferred embodiment, the inventive corrosion inhibitor comprises extracellular polymeric substances (EPS). In one embodiment, the invention presents a novel EPS corrosion inhibitor using waste activated sludge (WAS). In this embodiment, WAS is heated to release EPS from the microbial mixture.

Compositions and methods are provided for reducing, inhibiting, or preventing corrosion of a surface, the polyamine compounds corresponding to the structure of Formula 1 or 2, or a salt thereof:

##STR(1)##

wherein X.sub.1 is —C(O)R.sub.9 or —[C(R.sub.10R.sub.11)].sub.p—C(R.sub.12)(X.sub.2)—R.sub.13; X.sub.2 is —OH or —NH.sub.2; R.sub.1 and R.sub.4 are independently hydrogen, alkyl, or —[C(R.sub.10R.sub.11)].sub.p—C(R.sub.12)(X.sub.2)—R.sub.13; R.sub.2, R.sub.3, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.10, R.sub.11, and R.sub.12 are independently hydrogen or alkyl; R.sub.9 and R.sub.13 are independently C.sub.7 to C.sub.30 alkyl or alkenyl; m and o are integers from 1 to 10; n is an integer from 1 to 6; and p is an integer from 1 to 10;

##STR(2)##

wherein X.sub.2 is —OH or —NH.sub.2; R.sub.21, R.sub.22, R.sub.23, R.sub.24, R.sub.25, R.sub.26, and R.sub.28 are independently hydrogen or alkyl; R.sub.27 is C.sub.10 to C.sub.30 alkyl or alkenyl; m and o are integers from 1 to 10; n is an integer from 1 to 6; and q is an integer from 0 to 10.

A method for acid treatment of a wellbore in a carbonate formation is provided. The method includes dropping spacer solids into the well to fill the wellbore to perforations in a casing, dropping acidic solids into the wellbore on the top of the spacer solids, allowing the acidic solids to dissolve on top of the spacer solids forming an acidic solution, and injecting water into the wellbore to force the acidic solution into the carbonate formation.

A method for acid treatment of a wellbore in a carbonate formation is provided. The method includes dropping spacer solids into the well to fill the wellbore to perforations in a casing, dropping acidic solids into the wellbore on the top of the spacer solids, allowing the acidic solids to dissolve on top of the spacer solids forming an acidic solution, and injecting water into the wellbore to force the acidic solution into the carbonate formation.

Disclosed are corrosion inhibitor compounds and compositions useful for preventing or inhibiting corrosion of surfaces found in cooling water applications. In some embodiments, the surfaces may include mild steel, aluminum, brass, copper, galvanized steel, a copper alloy, admirality brass, or any combination thereof. Also disclosed are methods of using the compounds and compositions as corrosion inhibitors. In some embodiments, the corrosion inhibitor compounds and compositions are used in cooling water applications.

Disclosed are corrosion inhibitor compounds and compositions useful for preventing or inhibiting corrosion of surfaces found in cooling water applications. In some embodiments, the surfaces may include mild steel, aluminum, brass, copper, galvanized steel, a copper alloy, admirality brass, or any combination thereof. Also disclosed are methods of using the compounds and compositions as corrosion inhibitors. In some embodiments, the corrosion inhibitor compounds and compositions are used in cooling water applications.

A biocide blend can be used in an oil or gas operation. The biocide blend can include a first biocide of a formaldehyde-releasing biocide and a second biocide of a quaternary ammonium compound. The formaldehyde-releasing biocide can release formaldehyde after introduction into a wellbore. The first and second biocide can possess at least one property that is the same. The first biocide and/or the second biocide can maintain biocidal activity for extended periods of time in high salinity wellbore fluids, be thermally stable, and less expensive than other biocides.