Patent
Process for stably sequestering iron while acidizing a reservoir
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TLDR
In this paper, a well treating process in which an acidic solution having a pH of less than about 2 tends to dissolve ferric ion-containing materials from the well conduits and to precipitate ferric ions-containing solids when the pH of the solution increases beyond about 3, such a precipitation can be prevented by dissolving limited proportions of both 5-sulfosalicylic acid and citric acid within the acidic solution to be injected.Abstract:
In a well treating process in which an acidic solution having a pH of less than about 2 tends to dissolve ferric ion-containing materials from the well conduits and to precipitate ferric ion-containing solids when the pH of the solution increases beyond about 3, such a precipitation can be prevented by dissolving limited proportions of both 5-sulfosalicylic acid and citric acid within the acidic solution to be injected.read more
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Composition and method of stimulating subterranean formations
TL;DR: In this article, a method and composition for stimulating underground formations containing iron deposits is presented, which is an admixture of at least one member selected from the group consisting of gluconodeltalactone, citric acid, salts of citric acids, ethylenediaminetetraacetic acid, ammonium sulfate, nitrilotriacetic acids, ammoniosinamide acid, nitric acid and ammonium nitrate.
Patent
Compositions and method for controlling precipitation when acidizing sour wells
Walter R. Dill,Michael L. Walker +1 more
TL;DR: In this paper, a precipitation control additive composition, an acidizing composition for treating a sour well and a method of treating the sour well was provided, where an iron sequestering agent, such as aminopolycarboxylic acids, cyclic polyethers, and derivatives thereof, and a sulfide modifier such as aldehyde, acetal, hemiacetal, and many other compounds capable of forming aldehydes in solution are added to a treating solution.
Patent
Additives to enhance metal and amine removal in refinery desalting processes
TL;DR: In this paper, it was discovered that metals and amines can be removed or transferred from a hydrocarbon phase to a water phase in an emulsion breaking process by using a composition that contains water-soluble hydroxyacids.
Patent
Chemical method of ferric ion removal from acid solutions
TL;DR: Onium species of nitrogen, phosphorus or sulfur are useful to precipitate ferric ion, existing as tetrahaloferrate anion, from strong haloacid solutions as mentioned in this paper, which is useful in the field of well acidizing.
Patent
Method of preventing precipitation of ferrous sulfide and sulfur during acidizing
TL;DR: An improved method of acidizing sour gas wells involving the injection of an aqueous acidizing solution comprising: water, an acid, an effective amount of an iron complexing agent (e.g., EDTA) capable of stabilizing the ferrous, Fe(II), ion in solution in the presence of H 2 S and an iron reducing agent (i.e., erythorbic acid, ascorbic acid and mixtures thereof) is presented in this article.
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Method for stimulating well production
TL;DR: In this article, the production of hydrocarbons from a subterranean hydrocarbon-bearing formation containing acid-soluble components, such as one composed at least in part of dolomite or limestone, is stimulated by injecting into the formation a composition comprising an aqueous solution of a mineral acid having dissolved therein a compound hereinafter described.
Patent
Increasing the clay dissolving capability of a buffer-regulated mud acid
TL;DR: The clay dissolving capability of an aqueous mud acid solution of weak acid, weak acid salt and fluoride salt (of the type described in the E A Richardson US Pat No 3,889,753) can be increased by including in the solution a partial salt of an aminopolyacetic acid chelating or complex-forming agent as discussed by the authors.
Patent
Acidizing asphaltenic oil reservoirs with acids containing salicylic acid
TL;DR: A reservoir which contains an asphaltenio oil can be acidized with an aqueous acid without causing a deposition of permeability impairing iron-asphaltene compounds by dissolving or dispersing an effective amount of salicylio acid as mentioned in this paper.