Texaco Inc.

Texaco Chemical Company

Philip D Fader

Billy W Surles

Carlos W Pardo

Robert H Friedman

Mark D Looney

Manuel Eduardo Gonzalez

Robert B Carpenter

Arnold B Thigpen, Jr

Noel J Shotts

A molten metal plug which expands upon solidification can be used to form a pressure resistant seal in a tubular such as is used in oil and gas exploration and production.

Plug for tubulars

A resin composition useful in well completion and remedial methods having improved flexibility upon setting or curing is disclosed. The resin composition includes a polymerizable resin, an oil soluble acid catalyst capable of causing polymerization of the resin at formation temperatures, and 10 to 70% by volume rubber. The rubber may be in the form of ground rubber or an aqueous dispersion or emulsion. Also disclosed are methods for the use of the resin composition in well completion and remediation.

Formulation for creating a pliable resin plug

Methods are disclosed for treating porous media such as subsurface storage tanks or excavations therefore to form primary or secondary permeability barriers. A treatment fluid comprising a polymerizable monomer, a diluent therefor, and a strong acid catalyst mixed with steam is injected into a volume to be treated and contacted with the interior surface thereof. Contact is maintained for a duration sufficient to cause polymerization to occur forming an impermeable barrier in or on the interior surface of the treated volume.

Method for treating porous media

A method for fluid control or plugging of a well by injecting a mixture of an acid polymerizable resin, a polar organic diluent, and an acid catalyst, and later injecting an acidic fluid to quick-set a portion of the resin and hold it in place while the pre-mixed catalyst sets the resin. In an alternate sand consolidation embodiment, a fluid slug is injected between the resin and acidic fluid injections to create permeability in the resin saturated area of the formation prior to final set of the resin.

Quick-set formation treating methods

Disclosed are methods for treating wells to form a permeable barrier around the well for consolidating unconsolidated mineral particles such as sand in a subterranean petroleum formation penetrated by a well, or for forming an impermeable barrier for fluid entry control, or for plugging the well for abandonment. A fluid containing a polymerizable resin such as furfuryl alcohol oligomer or monomer, a polar organic diluent such as butyl acetate a dense solvent having density greater than the resin density, and an oil soluble acid catalyst to cause polymerization of the resin at formation temperatures is prepared. The dense solvent is bromobutane, bromobenzene, furfural, tetrachloroethane, tetrachloroethylene, tetrabromoethane, 1,2,4 trichlorobenzene and 1,2,3 tribromopropane or mixtures thereof. The amount of dense solvent is selected to ensure that the treating fluid density is greater than the density of the formation fluid, preferably at least 10 greater than the density of the formation fluid.

Formation treating methods

Disclosed are processes for treating a subterranean formation to improve the permeability distribution by reducing the permeability in high permeability zones, so fluids injected for oil recovery purposes will sweep more uniformly through the formation. The processes involve injecting a polymerizable compound, preferably a monomer or oligomer of furfuryl alcohol, together with a diluent, preferably an ester such as butyl acetate, and a suitable acid catalyst for the formation conditions, generally toluenesulfonic acid. The fluid may be injected in a liquid phase or mixed with steam or non-condensable gas to form an aerosol, which is injected then into the formation prior to the injection of the oil recovery fluid, which may be water, surfactant fluid, polymer fluid, or steam.

Formation treating

Methods are provided for consolidating unconsolidated mineral grains such as sand within a subterranean oil formation to form a fluid permeable barrier which restrains the movement of sand particles when oil passes through the barrier. A quantity of an organic solvent, preferably an ester such as butyl acetate is injected into the formation as a preflush. Next, a liquid comprising a polymerizable oligomer such as furfuryl alcohol oligomer, an ester such as butyl acetate, and an acid catalyst such as toluene sulfonic acid is provided, then mixed with a noncondensable gas to form a multiphase or aerosol treating fluid, and the treating fluid is injected into the formation to be consolidated. The well is shut in for sufficient period of time for polymerization to convert the injected fluids into a permeable barrier around the wellbore.

Sand consolidation methods

Methods are provided for selectively consolidating naturally occurring mineral grains such as sand grains within a subterranean formation to form a fluid permeable barrier, which restrains the movement of said particles when oil passes through the barrier. When applied to formations in which at least a portion of the sand grains are coated with a viscous oily residue of crude oil, or where the pore spaces between the sand grains contain excessive quantities of water, either of which interfere with the polymerization of the polymerizable monomer employed for said consolidation, a preflush is utilized which functions both to remove the oily residue from the said grains and to remove water from the pore spaces of the formation adjacent to the wellbore. the preflush is preferably an ester such as ethyl acetate or butyl acetate in an amount sufficient to occupy substantially all of the pore space of the formation into which the polymerizable component employed for sand consolidation are subsequently injected. In one preferred embodiment and acid catalyst such as sulfuric acid is added to the preflush. After injection of the preflush, the sand consolidation fluid usually containing a monomer or oligomer of furfuryl alcohol is injected, either mixed with steam to form a mulitphase treating fluid or injected as a liquid phase into the formation.

Methods are provided for selectively consolidating naturally occurring mineral grains such as sand within a subterranean formation to form a fluid permeable barrier which restrains the movement of sand particles when oil passes through the barrier. A fluid comprising a polymerizable monomer such as furfural alcohol and as a diluent, a polar organic solvent such as methanol and a strong, non-volatile acid catalyst such as sulfuric acid is provided, mixed with steam to form a multiphase or aerosol treating fluid, and injected into the formation to be consolidated. An ester such as butyl acetate is incorporated in the fluid when the steam quality is less than 80 percent. The well is shut in for sufficient period of time for polymerization to convert the injected fluids into a permeable barrier around the wellbore.

The disclosed invention is a method for improving the permeability of an underground hydrocarbon reservoir containing clay particles or other silaceous fines where damage has occurred or may occur. The method requires the injection into the hydrocarbon reservoir of an aqueous treating solution having a pH greater than about 12 and comprising about 2% to about 25% by weight of an alkali metal hydroxide. The invention also includes the injection of an aqueous buffer solution into the reservoir before, and optionally, after the injection of the treating solution. The before and after buffer solutions should have a pH greater than about 12 and comprise about 0.5% to about 5% by weight of alkali metal hydroxide and about 0.5% to about 5% by weight of alkali metal salt. The high pH aqueous buffer solutions maintain reaction products in solution, minimizing precipitation within the formation from the treating solution.

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Katy, TX, United States of America

Philip D Fader