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| Number | Title | Issue Date |
| 7216710 | Thiol/aldehyde corrosion inhibitors Methods of inhibiting corrosion comprising providing a corrosive environment; adding a corrosion inhibitor comprising a reaction product of a thiol compound and an aldehyde compound. Methods of acidizing a near well bore region of a subterranean formation comprising... | 05/15/2007 |
| 7165613 | Propped fracture with high effective surface area Propped fractures in formations from which fluids are produced are described that have wormholes extending out into the formations from the faces of the fractures at locations distant from boreholes. Methods are given for creating such propped fractures having wormh... | 01/23/2007 |
| 7086469 | Increasing reaction efficiency of acetic acid A method for removing or dissolving calcareous materials in a subterranean formation or in a wellbore consists of two basic steps. In the first step, an aqueous acid solution is injected into the formation or wellbore. The aqueous acid solution contains between from... | 08/08/2006 |
| 7073588 | Esterquat acidic subterranean treatment fluids and methods of using esterquats acidic subterranean treatment fluids The present invention relates to acidic treatment fluids that comprise an acid fluid and an ester-containing quaternary ammonium compound (“esterquat”) and methods of their use. One embodiment of the present invention provides a method of inhibiting metal corros... | 07/11/2006 |
| 6924255 | Composition and method for treating a subterranean formation Aqueous liquid compositions for increasing the permeability of a subterranean formation are disclosed, the compositions being characterized by provision of fluoborate anion (fluoboric acid) and a specified compound or compounds, or mixture thereof, which chelate alu... | 08/02/2005 |
| 6806236 | Composition and method for treating a subterranean formation Aqueous liquid compositions for increasing the permeability of a subterranean formation are disclosed, the compositions being characterized by provision of fluoborate anion (fluoboric acid) and a specified compound or compounds, or mixture thereof, which chelate alu... | 10/19/2004 |
| 6706668 | Electron transfer agents in well acidizing compositions and methods An acidizing composition and a method of acidizing a hydrocarbon bearing subterranean formation in the presence of ferric ions are provided. The acidizing composition includes a strong mineral acid solution, an electron donor agent, a primary electron transfer agent... | 03/16/2004 |
| 6706669 | Method for inhibiting corrosion using phosphorous acid The present invention relates to a method for inhibiting high temperature of corrosion-prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of phosphorous acid, typically up to 1000 wppm, to the meta... | 03/16/2004 |
| 6593278 | Method for inhibiting corrosion using certain phosphorus and sulfur-free compounds The present invention relates to a method for inhibiting corrosion of corrosion-prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of certain sulfur and phosphorus-free aromatic compound... | 07/15/2003 |
| 6534448 | Composition and method for acidizing wells and equipment without damaging precipitation An acidizing composition and a method of acidizing a hydrocarbon bearing subterranean formation in the presence of ferric ions are provided. The acidizing composition includes an aqueous mineral acid solution, an electron donor agent and an electron trans... | 03/18/2003 |
| 6315045 | Methods and acidizing compositions for reducing metal surface corrosion and sulfide precipitation Methods and acidizing compositions for reducing the corrosion of the metal surfaces of tubular goods and the like and reducing the precipitation of metal sulfide from the acidizing compositions are provided. The methods basically comprise the steps of com... | 11/13/2001 |
| 6117364 | Acid corrosion inhibitor An acid corrosion inhibitor composition is provided for petroleum wells and water wells subjected to stimulation with acid solutions. The inhibitor combines cinnamaldehyde and an organo-sulfur compound. The inhibitor provides a reduced rate of corrosion a... | 09/12/2000 |
| 6068056 | Well treatment fluids comprising mixed aldehydes An acidic fluid that is useful in stimulation and workover operations, and in particular, in matrix acidizing treatments, comprises an acid, such as hydrochloric acid; water; an aliphatic aldehyde having 1-10 carbon atoms; and an aromatic aldehyde having ... | 05/30/2000 |
| 6060435 | Solubilized and regenerating iron reducing additive A solubilized iron reducing additive for acid solutions and method for preparing such a solubilized iron reducing additive. The additive includes an iron reducing agent reactable with ferric ions to produce therefrom ferrous ions and a spent iron reducing... | 05/09/2000 |
| 6056896 | Metal corrosion inhibitor for use in aqueous acid solutions The present invention provides an improved metal corrosion inhibitor for use in aqueous acid solutions which is relatively non-toxic and inexpensive. The corrosion inhibitor is a mixture comprised of oligomerized aromatic amines prepared by contacting the... | 05/02/2000 |
| 5976416 | Corrosion inhibited organic acid compositions and methods The present invention provides corrosion inhibited organic acid compositions and methods of using the compositions. The compositions basically comprise water, an organic acid, a corrosion inhibitor comprising at least one quaternary ammonium compound and ... | 11/02/1999 |
| 5961885 | Solutions and methods for inhibiting corrosion A corrosion inhibitor comprising a dispersant, an imidazoline, an amide, an alkyl pyridine and a heavy aromatic solvent. The resultant blend effectively inhibits corrosion of flow lines containing low pH mixtures of hydrocarbons, water, and acid gases.... | 10/05/1999 |
| 5916484 | Metal corrosion inhibited organic acid compositions By the present invention, improved metal corrosion inhibited aqueous organic acid compositions and methods are provided. The compositions are basically comprised of water, an organic acid, a corrosion inhibitor comprising at least one rosin amine derivati... | 06/29/1999 |
| 5792420 | Metal corrosion inhibitor for use in aqueous acid solutions The present invention provides an improved metal corrosion inhibitor for use in aqueous acid solutions which is relatively non-toxic and inexpensive. The corrosion inhibitor is a mixture comprised of oligomerized aromatic amines prepared by contacting the... | 08/11/1998 |
| 5783526 | Process to enhance removal of adhering solids from the surface of wellbores and sand control devices therein The invention provides: (1) a process to enhance the removal of solids such as clays, clay-like solids, and shale solids-drill solids-from the surface of a borehole, the solids being deposited from well drilling, completion, or workover fluids during well... | 07/21/1998 |
| 5763368 | Corrosion inhibited well acidizing compositions and methods The present invention provides corrosion inhibited well acidizing compositions and methods of using the compositions to acidize wells. The compositions basically comprise an aqueous acid solution, a corrosion inhibitor comprising at least one quaternary a... | 06/09/1998 |
| 5756004 | Quaternary ammonium compounds useful for inhibiting metal corrosion The present invention provides improved quaternary ammonium compounds useful as metal corrosion inhibitors in aqueous acid solutions, methods of preparing the compounds, metal corrosion inhibited aqueous acid solutions containing the compounds and methods... | 05/26/1998 |
| 5543388 | Intensified corrosion inhibitor and method of use Elemental iodine is used to improve the performance of conventional corrosional inhibitors in oil field acidizing operations. The iodine, because of its solubility, may be used in a formulation which includes a corrosion inhibitor and surfactants dissolve... | 08/06/1996 |
| 5520251 | Method for acidizing oil producing formations An improved method for preventing iron precipitation from a spent oil well acidizing solution is disclosed. The acidizing solution is preceded into the tubular goods and formation by the injection of an iron sensitive, acid insensitive acidified surfactan... | 05/28/1996 |
| 5441929 | Hydrochloric acid acidizing composition and method A hydrochloric acid acidizing composition for treating a subterranean formation penetrated by a well bore to increase the production of desired materials (e.g., hydrocarbons) therefrom that includes a corrosion inhibitor for protecting both ferrous based ... | 08/15/1995 |
| 5366643 | Method and composition for acidizing subterranean formations The invention relates to a method and composition for acidizing a subterranean formation employing an acidic solution comprising hydrochloric acid solution containing a corrosion inhibitor present in a corrosion-reducing effective amount. The corrosion in... | 11/22/1994 |
| 5346010 | Precipitation of scale inhibitors in subterranean formations Scale inhibitors are precipitated in a formation by injection in an acidic solution comprising a base generating component and a chelating agent. The inhibitor is preferably a calcium salt of an organic phosphonate. The chelating agent prevents iron ions ... | 09/13/1994 |
| 5336441 | Corrosion inhibition in highly acidic environments by use of pyridine salts in combination with certain cationic surfactants A method for inhibiting corrosion of ferrous surfaces in an acidic, aqueous medium is disclosed. The method comprises incorporating into the medium a corrosion-inhibiting amount of a pyridine salt composition (comprising a quaternary pyridine salt composi... | 08/09/1994 |
| 5264141 | Methods of reducing precipitation from acid solutions Methods and compositions for reducing the precipitation of metal sulfides from acid solutions are provided. The methods basically comprise reducing the precipitation of metal sulfide compounds from an aqueous acid solution when the solution dissolves sulf... | 11/23/1993 |
| 5209859 | Inhibited acid system for acidizing wells An acid system for acidizing wells contains corrosion inhibitor additives which consist essentially of a metal selected from antimony and antimony mixtures, a quaternary compound, and a surfactant. The corrosion inhibitor is free of toxic acetylenic compo... | 05/11/1993 |
| 5200096 | Method of inhibiting corrosion in acidizing wells Corrosion inhibitor additives are added directly to an aqueous acid solution used in acidizing subterranean formations. The additives comprise a bismuth compound, a quaternary compound, and a surfactant. The corrosion inhibitor is free of toxic Sb and ace... | 04/06/1993 |
| 5096618 | Process and composition for inhibiting high-temperature iron and steel corrosion A composition and method for inhibiting corrosion of iron and steel in the presence of aqueous acid at high temperatures, containing an alkenylphenone having the following structure: ##STR1## wherein R1 may be aryl of 6 to about 10 carbons... | 03/17/1992 |
| 5089153 | Method of inhibiting corrosion in acidizing wells Corrosion inhibitor additives are added directly to an aqueous acid solution used in acidizing subterranean formations. The additives consist essentially of a metal selected from antimony and antimony mixtures, a quaternary compound, and a surfactant. The... | 02/18/1992 |
| 5063997 | Method of preventing precipitation of iron compounds during acid treatment of wells The invention discloses a process for reducing sludging during acid treatment of an oil well by adding phosphinic acid or a soluble salt thereof and a source of cupric or cuprous ion. The addition of an iodide ion source to this combination aids its effec... | 11/12/1991 |
| 5058678 | Method for preventing the formation of sludge in crude oil An aqueous acidic composition useful for conducting a formation acidizing method is disclosed. The composition, which is comprised of a blend of acetic acid, formic acid, a fatty alkyl quaternary ammonium salt, a fatty aralkyl quaternary ammonium salt and... | 10/22/1991 |
| 5009799 | Inorganic acid solution viscosifier and corrosion inhibitor and method A viscosifier for aqueous inorganic acid solutions, viscosified acid fluids, and a method of treating hydro-carbon-producing rock formations with viscosified acid solution are provided. The viscosified acid solutions contain an inorganic acid, water, and ... | 04/23/1991 |
| 4997040 | Corrosion inhibition using mercury intensifiers An acid soluble mercury metal salt intensifier is provided to inhibit corrosion in conjunction with a corrosion inhibitor when a steel surface is present in an acid environment. The mercury metal salt may be a mercuric halide, such as mercuric chloride or... | 03/05/1991 |
| 4949790 | Compositions and method for controlling precipitation when acidizing sour wells A precipitation control additive composition, an acidizing composition for treating a sour well and a method of treating a sour well are provided. An iron sequestering agent and a sulfide modifier are added to a treating solution. The iron sequestering ag... | 08/21/1990 |
| 4888121 | Compositions and method for controlling precipitation when acidizing sour wells A precipitation control additive composition, an acidizing composition for treating a sour well and a method of treating a sour well are provided. An iron sequestering agent, such as aminopolycarboxylic acids, hydroxycarboxylic acids, cyclic polyethers, a... | 12/19/1989 |
| 4871024 | Fluid for treatment of a subterranean well for enhancement of production An acid soluble copper metal salt intensifier is provided for a fluid for treatment of a subterranean well for enhancement of production within the well by introduction of the fluid through a high alloy steel member positioned within the well. The treatme... | 10/03/1989 |
