| Patent application number | Description | Published |
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| 20100276152 | ACIDIC AQUEOUS SOLUTION CONTAINING A CHELATING AGENT AND THE USE THEREOF - The present invention relates to an acidic aqueous solution containing a chelating agent and an acid, wherein the chelating agent is glutamic acid N,N-diacetic acid (GLDA) or a salt thereof and wherein the amount of GLDA or the salt thereof is at least 10 wt %, based on the weight of the aqueous solution, and to the use thereof as an oilfield chemical, in descaling processes, or in processes in which highly concentrated aqueous acids are used, such as cleaning processes or plating processes. | 11-04-2010 |
| 20120202720 | ENVIRONMENTALLY FRIENDLY STIMULATION FLUIDS, PROCESSES TO CREATE WORMHOLES IN CARBONATE RESERVOIRS, AND PROCESSES TO REMOVE WELLBORE DAMAGE IN CARBONATE RESERVOIRS - The present invention includes processes to create wormholes in carbonate reservoirs by contacting a formation with a solution comprising glutamic acid N,N-diacetic acid (GLDA) and/or a salt thereof, methylglycine-N,N-diacetic acid (MGDA) and/or a salt thereof, or a combination thereof. The present invention also includes processes to remove wellbore damage in a carbonate reservoir by contacting a damaged zone of the carbonate reservoir with a solution comprising GLDA and/or a salt thereof, methylglycine-N,N-diacetic acid (MGDA) and/or a salt thereof, or a combination thereof. The present invention further includes solutions comprising a salt and further comprising GLDA and/or a salt thereof, methylglycine-N,N-diacetic acid (MGDA) and/or a salt thereof, or a combination thereof. | 08-09-2012 |
| 20130247630 | COMPLEX OF DIVALENT METAL CATIONS AND CHELATING AGENT - The present invention relates to a complex of two divalent metal cations and a chelating agent chosen from the group of EDDHA (ethylenediamine-N,N′-di-(hydroxyphenyl acetic acid)), EDDHMA (ethylenediamine-N,N′-di-(hydroxy-methylphenyl acetic acid)), and HBED(N,N′-bis(hydroxybenzyl)ethylenediamine-N,N′-diacetic acid), a process to prepare such complex, plant nutrition compositions containing such complex and the use thereof as an algaecide, a bactericide, a herbicide, an insecticide, a molluscicide, a virucide or a fungicide, other than a fungicide or bactericide used for personal care. | 09-26-2013 |
| 20130264060 | FLUID SUITABLE FOR TREATMENT OF CARBONATE FORMATIONS CONTAINING A CHELATING AGENT - The present invention covers a fluid and kit of parts suitable for treating carbonate formations containing glutamic acid N,N-diacetic acid or a salt thereof (GLDA) and/or methylglycine N,N-diacetic acid or a salt thereof (MGDA), a corrosion inhibitor, and a surfactant, and the use thereof. | 10-10-2013 |
| 20130274155 | PROCESS TO CONTROL IRON IN OIL AND GAS APPLICATIONS USING A CHELATING AGENT - The present invention relates to a process to control iron in a subterranean formation wherein a fluid containing glutamic acid N,N-diacetic acid or a salt thereof (GLDA) and/or methylglycine N,N-diacetic acid or a salt thereof (MGDA) is introduced into the formation at a temperature between 77 and 400° F. (about 2 and 204° C.). The invention also covers a process of treating a subterranean formation wherein simultaneously iron control takes place. | 10-17-2013 |
| 20130281329 | AMMONIUM SALTS OF CHELATING AGENTS AND THEIR USE IN OIL AND GAS FIELD APPLICATIONS - The present invention relates to a process for treating a subterranean formation wherein a fluid containing an ammonium salt of glutamic acid N, N-diacetic acid (GLDA) or methylglycine N, N-diacetic acid (MGDA) is introduced into the formation. The invention also covers a fluid containing an ammonium salt of GLDA and/or MGDA and at least one component from the group of seawater, mutual solvents, anti-sludge agents, (water-wetting or emulsifying) surfactants, foaming agents, corrosion inhibitors corrosion inhibitor intensifiers, viscosifiers, wetting agents, diverting agents, oxygen scavengers, carrier fluids, fluid loss additives, friction reducers, stabilizers, rheology modifiers, gelling agents, scale inhibitors, breakers, salts, brines, pH control additives, bactericides/biocides, particulates, crosslinkers, salt substitutes (such as tetramethyl ammonium chloride), relative permeability modifiers, sulfide scavengers, fibres, nanoparticles, and consolidating agents, and covers an ammonium salt of the formula M | 10-24-2013 |
| 20130331304 | CHELATING AGENT PRECURSORS, FLUIDS CONTAINING THEM, AND THEIR USE - The present invention relates to a chelating agent precursor that contains glutamic acid N,N-diacetic acid (GLDA) and/or methylglycine N,N-diacetic acid (MGDA) wherein at least one of the carboxylic acid groups is present as a carboxylic acid derivative selected from the group of amides, anhydrides, and esters, combinations thereof, and salts thereof, provided that it is not the triethyl ester of GLDA, the triethyl mono-t-butyl ester of GLDA, the tri-t-butyl ester of GLDA, the monobenzyl tri-t-butyl ester of GLDA, any ester or amide that contains azacycloalkane groups, any amide that contains biotin groups, any amide that contains minoethylcarbamoyl based amide groups, (S)-diethyl 2,2′-(1-benzyloxy)-1,5-dioxo-5-(prop-2-ynylamino)pentan-2-ylazanediyl-diacetate, diethyl 2,2′-(5-(3-azidopropylamino)-1-(benzyloxy)-1,5-dioxo-pentan-2-ylazanediyl-diacetate, the trimethyl ester of MGDA, the monomethyl ester dimethylamide of MGDA, the dibenzyl ester of MGDA, the dibenzyl mono t-butyl ester of MGDA, the di t-butyl ester of MGDA, the di-t-butyl- monobenzyl ester of MGDA, N,N-bis(benzyloxycarbonylmethyl)-N′-methoxycarbonyl-methyl-alanine amide, or N,N-bis(tert-butoxycarbonyl)-N′-methoxycarbonylmethyl-alanine amide, and esters of GLDA immobilized on a gel, and that the amide is not the amide of ammonia, to a fluid containing the above chelating precursor and a liquid, and to the use of a chelating agent precursor of MGDA and GLDA and fluids containing them in an application wherein delayed acidity or the chelating capacity is useful, such as in descaling, bleaching, cleaning, and treating oil and/or gas-containing subterranean formations. | 12-12-2013 |
| 20150361330 | ENVIRONMENTALLY FRIENDLY STIMULATION FLUIDS, PROCESSES TO CREATE WORMHOLES IN CARBONATE RESERVOIRS, AND PROCESSES TO REMOVE WELLBORE DAMAGE IN CARBONATE RESERVOIRS - The present invention includes processes to create wormholes in carbonate reservoirs by contacting a formation with a solution comprising glutamic acid N,N-diacetic acid (GLDA) and/or a salt thereof, methylglycine-N,N-diacetic acid (MGDA) and/or a salt thereof, or a combination thereof. The present invention also includes processes to remove wellbore damage in a carbonate reservoir by contacting a damaged zone of the carbonate reservoir with a solution comprising GLDA and/or a salt thereof, methylglycine-N,N-diacetic acid (MGDA) and/or a salt thereof, or a combination thereof. The present invention further includes solutions comprising a salt and further comprising GLDA and/or a salt thereof, methylglycine-N,N-diacetic acid (MGDA) and/or a salt thereof, or a combination thereof. | 12-17-2015 |
