WO2015048716A1 - Compositions de fluide hydraulique de régulation environnementale sous-marine - Google Patents

Compositions de fluide hydraulique de régulation environnementale sous-marine Download PDF

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Publication number
WO2015048716A1
WO2015048716A1 PCT/US2014/058238 US2014058238W WO2015048716A1 WO 2015048716 A1 WO2015048716 A1 WO 2015048716A1 US 2014058238 W US2014058238 W US 2014058238W WO 2015048716 A1 WO2015048716 A1 WO 2015048716A1
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Prior art keywords
process according
composition
hydraulic fluid
salt
acid
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PCT/US2014/058238
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English (en)
Inventor
Ian D. Smith
John C. Kennedy
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Macdermid Offshore Solutions, Llc
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Publication date
Priority claimed from US14/041,669 external-priority patent/US9096812B2/en
Application filed by Macdermid Offshore Solutions, Llc filed Critical Macdermid Offshore Solutions, Llc
Priority to AU2014324559A priority Critical patent/AU2014324559A1/en
Priority to EP14849223.4A priority patent/EP3052597A4/fr
Priority to BR112016007084A priority patent/BR112016007084A2/pt
Publication of WO2015048716A1 publication Critical patent/WO2015048716A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/087—Boron oxides, acids or salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/08—Aldehydes; Ketones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/14—Containing carbon-to-nitrogen double bounds, e.g. guanidines, hydrazones, semicarbazones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/221—Six-membered rings containing nitrogen and carbon only
    • C10M2215/222—Triazines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/225—Heterocyclic nitrogen compounds the rings containing both nitrogen and oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/10—Phosphatides, e.g. lecithin, cephalin
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/64—Environmental friendly compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

Definitions

  • This invention relates to aqueous hydraulic fluid compositions, especially hydraulic fluid compositions for use in actuating devices associated with offshore oil production, wherein in some embodiments the fluid can contain little or no glycols.
  • Hydraulic fluids are low viscosity fluids used for the transmission of useful power by the flow of the fluid under pressure from a power source to a load.
  • a liquid hydraulic fluid generally transmits power by virtue of its displacement under a state of stress.
  • Hydraulic fluids generally operate with a low coefficient of friction.
  • the compositions typically have sufficient antiwear, antiweld, and extreme pressure properties to minimize metal damage from metal-to-metal contact under high load conditions.
  • Hydraulic fluids are usable in subsea control devices that are used to control wellhead pressure of an oil well under production. The hydraulic equipment can open or close a well, choke the oil or gas flow, inject chemicals into the well or divert water and/or gas into the well to re-pressurise the system.
  • aqueous based hydraulic fluid compositions such as may be used in subsea devices continues to increase due to the environmental, economic and safety (e.g. non-flammability) advantages of such fluids over conventional non-aqueous, oil-type hydraulic fluids.
  • the present invention in one embodiment relates to an improved aqueous hydraulic fluid composition comprising:
  • alkali metal or ammonium hydroxide such that the pH of the fluid is between 7 and 10, preferably 8-10 or about 9.
  • the fluid also optionally comprises secondary corrosion inhibitors and secondary lubricants.
  • the present invention is directed to an aqueous hydraulic fluid composition which is environmentally safe and preferably contains no mineral oils, hydrocarbon oils (natural or synthetic).
  • the aqueous hydraulic fluid also preferably contains no glycols. Accordingly, the present invention relates to an aqueous hydraulic fluid composition comprising:
  • alkali metal or ammonium hydroxide such that the pH of the fluid is between 7 and 10, preferably, 8-10 or about 9;
  • hydraulic fluid composition is substantially free of mineral oils, hydrocarbon oils (natural or synthetic), and mixtures thereof.
  • the hydraulic fluid composition can also be preferably free of glycols in some embodiments.
  • the salt or salts of formic acid are believed to act as a pour point depressant for the fluid.
  • the salt is potassium formate.
  • the concentration of the formate salt is preferably from 15% to 50% by weight of the fluid.
  • the present invention utilizes an aqueous solution of a salt of a dicarboxylic acid.
  • the dicarboxylic acid is an alkyl C21 or CI 8 dicarboxylic acid and the salt is a potassium salt or amine salt of the C21 or C 18 dicarboxylic acid. It is believed that the potassium salt of this dicarboxylic acid is more water soluble than the dicarboxylic acid itself and is therefore preferable.
  • One preferable compound in this regard is 2-cyclohexene-l-octanoic acid, 5-carboxy-4-hexyl and its salts.
  • the dicarboxylic acids (or salts thereof) used in this invention preferably have carbon chain lengths (straight, branched or cyclic) of from 2-30 carbons.
  • the hydraulic fluid of the invention comprises more than one dicarboxylic acid or salt thereof.
  • the concentration of the dicarboxylic acid salt in the hydraulic fluid of the invention should preferably range from 0.1% to 35% by weight.
  • One preferred dicarboxylic acid is succinic acid and the alkali metal, amine or alkanol amine salts thereof.
  • One function of the dicarboxylic acid salt is to act as the primary corrosion inhibitor of the fluid and as a primary lubricant.
  • the inventor of the present invention have determined that the lubrication, corrosion and other physical properties of the dicarboxylic acid salt(s) in hydraulic fluid formulations are maintained after exposure to high temperatures such as 190°C for a considerable length of time (30 days or more). Certain amines and other salts of such dicarboxylic acids in the formulation are also believed to exhibit high thermal and seawater stability.
  • the hydraulic fluid composition of the invention may also preferably comprise a second lubricant, said second lubricant selected from the group consisting of alkyl/aryl phosphate esters, alkyl/aryl phosphite esters, phospholipids, mono, di, tri, or polymeric carboxylic acid salts and combinations of the foregoing.
  • Phospholipids usable in the formulations of the invention include any lipid containing a phosphoric acid derivative, such as lecithin or cephalin, preferably lecithin or derivatives thereof.
  • phospholipids examples include phosphatidylcholine, phosphatidylserine, phosphatidylinositol, phosphatidylethanolamine, phosphatidic acid and mixtures thereof.
  • the phospholipids may also be glycerophospholipids, more preferably, glycero derivatives of the above listed phospholipids.
  • glycerophospholipids have one or two acyl groups on a glycerol residue, and each acyl group contains a carbonyl and an alkyl or alkenyl group.
  • the alkyl or alkenyl groups generally contain from about 8 to about 30 carbon atoms, preferably 8 to about 25, most preferably 12 to about 24.
  • concentration of the secondary lubricant in the hydraulic fluid of the invention should preferably range from 0.1 to 20% by weight.
  • the acyl groups on the glycerophospholipids are generally derived from fatty acids, which are acids having from about 8 to about 30 carbon atoms, preferably about 12 to about 24, most preferably about 12 to about 18 carbon atoms.
  • fatty acids include myristic, palmitic, stearic, oleic, linoleic, linolenic, arachidic, arachidonic acids, or mixtures thereof, preferably stearic, oleic, linoleic, and linolenic acids or mixtures thereof.
  • phospholipids including acylated or hydroxylated phospholipids may also be used in the practice of the invention.
  • lecithin as well as acylated and hydroxylated lecithin may be used in the present invention as a primary or secondary lubricant.
  • Phospholipids may be prepared synthetically or derived from natural sources. Synthetic phospholipids may be prepared by methods known to those in the art. Naturally derived phospholipids are extracted by procedures known to those in the art. Phospholipids may be derived from animal or vegetable sources. Animal sources include fish, fish oil, shellfish, bovine brain and any egg, especially chicken eggs. Vegetable sources include rapeseed, sunflower seed, peanut, palm kernel, cucurbit seed, wheat, barley, rice, olive, mango, avocado, palash, papaya, jangli, bodani, carrot, soybean, corn, and cottonseed.
  • Phospholipids may also be derived from micro organisms, including blue-green algae, green algae, bacteria grown on methanol or methane and yeasts grown on alkanes.
  • the phospholipids are derived from vegetable sources, including soybean, corn, sunflower seed and cottonseed.
  • the preferred secondary lubricant is an ethoxylated acid phosphate ester, such as
  • the concentration of the secondary lubricant in the fluid is preferably from about 0.1% to about 5% by weight of the fluid.
  • Other suitable lubricants include fatty monoethanol amides or fatty diethanol amides.
  • the secondary lubricant may also comprise an alkoxylate salt as a second lubricant for the hydraulic fluid composition.
  • an alkoxylate salt preferably a metal or amine salt of a mono, di, tri or polymeric alkoxylate
  • Suitable alkoxylate salts include salts of alkoxylates with from 2 to 30 carbons in the alkoxylate carbon chain (straight, branched or cyclic). It is also known that typical compositions can be very difficult to stabilize thermally.
  • the inventor of the present invention has surprisingly discovered that the use of alkoxylate salt(s) to the aqueous hydraulic fluid composition stabilizes the fluid composition from thermal degradation, even in the presence of 10% v/v synthetic seawater which gives the fluid compositions a much longer service life under extreme conditions.
  • the fluid also contains a secondary corrosion inhibitor.
  • a secondary corrosion inhibitor is a caproic acid salt, more preferably an alkanolamine salt of a caproic acid, most preferably an arylsulfonamido caproic acid alkanolamine salt. If used, the concentration of the secondary corrosion inhibitor is preferably from about 1% to about 20% by weight of the fluid.
  • the aqueous hydraulic fluid compositions of the invention may also contain a biocide.
  • the biocide is chosen so as to be compatible with the lubricating components, i.e., it does not affect lubricating properties.
  • a boron containing salt such as borax decahydrate, is used simultaneously as the biocide and as a pH buffer.
  • the biocide may be a sulfur-containing biocide or a nitrogen- containing biocide.
  • Nitrogen-containing biocides include gluteraldehyde, triazines, oxazolidines, and guanidines as well as compounds selected from fatty acid quaternary ammonium salts, such as didecyl dimethyl quaternary ammonium chloride salt.
  • the concentration of the biocide is sufficient to at least substantially prevent bacterial growth in the hydraulic fluid and preferably to kill the bacteria present.
  • the hydraulic fluid may also comprise an antifreeze additive capable of lowering the freezing point of the hydraulic fluid to at least about -30°F, which is below the minimum temperature expected to be encountered in such environments.
  • the antifreeze additive is chosen so as to be non-reactive with the lubricating components and biocide and is therefore not detrimental to the lubricating properties of the hydraulic fluid.
  • the anti-freeze additive comprises at least one alcohol having from 2 to 4 carbon atoms in an amount sufficient to reduce the freezing point to below -30°F.
  • Suitable alcohols include monoethylene glycol, glycerol, propylene glycol, 2- butene-1 , 4-diol, polyglycol ethers, polyethylene glycols or polypropylene glycols.
  • monoethylene glycol which is PLONOR approved is used as the anti-freeze additive of the invention in an amount sufficient to reduce the freezing point of the hydraulic fluid composition to the desired temperature whilst preventing the formation of "hydrates" in the subsea equipment during use.
  • the hydraulic fluid can preferably be free of glycol in some embodiments.
  • the hydraulic fluid may also comprise one or more surfactants such as an alcohol etyoxylate to help with seawater stability (tolerance).
  • the pH of the hydraulic fluid preferably between 8 and 10, preferably between 9 and 9.5.
  • Maintenance of the pH of the hydraulic fluid in the prescribed range is important for many reasons, including (i) minimizing corrosion or degradation of metal and/or plastic parts that come into contact with the hydraulic fluid, (ii) ease of handling the hydraulic fluid, and (iii) stability of the components of the hydraulic fluid.
  • the buffer must be stable and effective at the temperatures experienced by the hydraulic fluid which range from about 20°F to about 420°F.
  • Borax or borax decahydrate
  • Borax can be effectively used as a buffer whether the hydraulic fluid contains glycols or not.
  • the foregoing compounds effectively buffer the pH of the hydraulic fluid to within 8 to 9.5 and are stable at the temperatures experienced by the hydraulic fluids.
  • One preferable ring based tertiary amine with no hydroxyl functionality which is particularly stable at high temperatures is 1, 4-dimethyl piperazine.
  • Other suitable ring based tertiary amines with no hydroxy functionality include 2-morpholinoethane sulfonic acid; N-methyl morpholine; N-methyl piperazine; N-methylpyrrolidine; 1 ,4-piperazine-Bis-ethanesulfonic acid;
  • the concentration of the buffer in the hydraulic fluid is preferably from 0.1 to 6 weight percent, most preferably from 0.5 to 3 weight percent.
  • the above-described embodiment is preferred for applications such as in hydraulic fluid for subsea control fluids encountered in or with off-shore oil drilling rigs, other embodiments are suitable for many applications.
  • a corrosion inhibitor need not be included in the composition of the hydraulic fluid.
  • the biocide may be omitted.
  • a freezing-point depressant is not required.
  • the hydraulic fluid is prepared as a ready to use concentrate which does not need diluting to achieve the working performance.
  • An aqueous hydraulic fluid was prepared having the following formulation:
  • This composition was tested as a high pressure hydraulic fluid. It maintained its lubricity under load and was able to tolerate contamination with 10% w/w seawater.
  • the pH of the hydraulic fluid was 9 and was maintained at about 9 through the foregoing prolonged use.
  • the wear results were 13 wear teeth using a Falex anti-wear test.
  • the sample also passed the IP 28% chip test for corrosion resistance.
  • An aqueous hydraulic fluid was prepared having the following formulation:
  • This composition was tested as a high pressure hydraulic fluid. It maintained its lubricity after prolonged use (30 days) at 190°C and was able to tolerate contamination with 10% w/w seawater. The pH of the hydraulic fluid was 9 and was maintained at about 9 through the foregoing prolonged use. The wear results were acceptable. The sample also passed the IP 28% chip test for corrosion resistance.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

L'invention porte sur une composition aqueuse de fluide hydraulique qui comporte (i) un sel d'acide formique et (ii) un ou plusieurs lubrifiants tels qu'un sel de métal monovalent, un sel d'ammonium ou un sel d'amine d'un acide dicarboxylique, la composition aqueuse de fluide hydraulique manifestant une plus grande stabilité thermique lorsqu'elle est exposée à des températures élevées pendant une période de temps prolongée, tout en étant capable de tolérer la présence de 10 % v/v d'eau de mer synthétique. La composition aqueuse de fluide hydraulique contient moins d'environ 20 % en poids (de préférence 0 % ou sensiblement 0 %) d'une huile choisie dans le groupe constitué par les huiles minérales, les huiles hydrocarbonées synthétiques et leurs mélanges. Le fluide hydraulique ne contient, de préférence, pas de glycols dans certains modes de réalisation. Le pH du fluide hydraulique, qui se situe, de préférence, entre 8 et 10, est maintenu par un tampon qui comporte, de préférence, du borax dans certains modes de réalisation.
PCT/US2014/058238 2013-09-30 2014-09-30 Compositions de fluide hydraulique de régulation environnementale sous-marine WO2015048716A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2014324559A AU2014324559A1 (en) 2013-09-30 2014-09-30 Environmental subsea control hydraulic fluid compositions
EP14849223.4A EP3052597A4 (fr) 2013-09-30 2014-09-30 Compositions de fluide hydraulique de régulation environnementale sous-marine
BR112016007084A BR112016007084A2 (pt) 2013-09-30 2014-09-30 composições de fluido hidráulico para controle ambiental submarino

Applications Claiming Priority (2)

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US14/041,669 2013-09-30
US14/041,669 US9096812B2 (en) 2008-07-15 2013-09-30 Environmental subsea control hydraulic fluid compositions

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US20030134967A1 (en) * 1999-12-02 2003-07-17 Pentti Hukkanen Aqueous hydraulic medium
US20100016187A1 (en) * 2008-07-15 2010-01-21 Smith Ian D Environmental Subsea Control Hydraulic Fluid Compositions
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EP3052597A4 (fr) 2017-04-26
EP3052597A1 (fr) 2016-08-10
BR112016007084A2 (pt) 2017-08-01

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