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Hydraulic fluid compositions

Inactive Publication Date: 2009-02-05
MACDERMID OFFSHORE SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]It is an object of the present invention to provide an improved aqueous hydraulic fluid composition for use under the extreme conditions encountered in BOP devices.
[0013]It is another object of the present invention to provide an aqueous hydraulic fluid composition that exhibits improved lubricity.
[0014]It is still another object of the present invention to provide an aqueous hydraulic fluid concentrate that has greater stability, in both its concentrated and diluted form.

Problems solved by technology

There are many reported problems associated with conventional hydraulic fluids used in BOP applications.
For example, the handling of many conventional hydraulic fluids may be complicated by their combustibility, i.e., low flash points, and poor fire resistance.
In addition, many conventional hydraulic fluids are toxic and accidental spillage, especially into the ocean, creates significant environmental problems.
Many conventional hydraulic fluids are not suitable for BOP applications due to their low tolerance to sea water contamination or to contamination by hydrocarbons, i.e., they tend to readily form emulsions with small amounts of hydrocarbons.
Furthermore, in marine environments, problems arise due to the lack of biodegradability of the hydraulic fluid and to bacterial infestations arising in the hydraulic fluid, especially from anaerobic bacteria such as the sulfate reducing bacteria prevalent in sea water.
Other problems associated with the use of conventional hydraulic fluids under the extreme conditions encountered in BOP devices include: (1) some conventional hydraulic fluids may, cause corrosion with metals in contact with the fluid; (2) some conventional hydraulic fluids are reactive with paints or other metal coatings or tend to react with elastomeric substances or at least cause swelling of the elastomeric substance; (3) poor longterm stability, especially at elevated temperatures; (4) some hydraulic fluids require anti-oxidants to avoid the oxidation of contained components; (5) some hydraulic fluids are not readily concentrated for ease in shipping; and (6) many conventional hydraulic fluids have a non-neutral pH, thereby enhancing the opportunity for reaction with materials in contact with it.

Method used

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Examples

Experimental program
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Effect test

example 1

[0043]Formulations were prepared with lecithin in the concentrate and without calcium stearate in a PLONOR formulation. A first formulation was prepared with 7% by weight lecithin in the concentrate and no calcium stearate. A second formulation was prepared with 12% by weight lecithin and no calcium stearate. A third formulation was prepared with 14% by weight lecithin and no calcium stearate. A fourth formulation contained 7% by weight lecithin and 7% by weight calcium stearate. In addition to the above ingredients the PLONOR formulations contained:

IngredientWeight %monoethylene glycol62inorganic phosphate salts 6waterbalance

[0044]Each formulation was diluted to 10% w / w with water and a Falex extreme pressure (EP) test was performed on each fluid.

[0045]The Falex tester measures the torque experienced on a rotating test pin submerged in the test fluid, as it is subjected to increasing load. The load on the pin is increased at 100 pound increments and the torque measured at each load...

example 2

[0048]A first formulation was prepared with 8% by weight lecithin with 66% by weight monoethylene glycol (MEG) and water and a second formulation was prepared with the addition of 1% calcium stearate to the first formulation. An extreme pressure test was performed on each fluid and the data are tabulated in Table 2. A graphical representation of the data is provided in FIG. 2.

TABLE 2Falex Extreme Pressure Test Data8% lecithin with8% lecithin withMEG / water and 1%MEG / watercalcium stearateApplied LoadTorqueTorque(pounds)(in · Lbs)(in · Lbs)3007.13.34007.65.15009.46.260011.46.970013.98.180018.510.590022.014.5100022.819.3110023.421.4120025.422.6130028.324.0140029.625.7150030.527.3160031.629.1170033.031.1180033.532.8190034.934.6200036.836.5

example 3

[0049]A first formulation was prepared with 4% lecithin with 78% by weight monoethylene glycol (MEG) and water and a second formulation was prepared with the addition of 1% calcium stearate to the first formulation. An extreme pressure test was performed on each fluid and the data are tabulated in Table 3. A graphical representation of the data is provided in FIG. 3.

TABLE 3Falex Extreme Pressure Test Data4% lecithin with4% lecithin withMEG / water and 1%MEG / watercalcium stearateApplied LoadTorqueTorque(pounds)(in · Lbs)(in · Lbs)3005.05.24008.07.05009.38.860010.810.270012.812.580015.616.090020.119.5100025.521.0110025.621.5120026.523.1130027.925.6140029.627.5150031.029.0160032.730.7170034.632.9180035.834.8190037.335.2200038.835.0210040.035.2220041.235.1230042.835.5240043.835.4250042.836.6

[0050]The above examples demonstrate that the inventor of the present invention has determined that calcium stearate improves the lubricity of the formulation in every case.

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Abstract

An aqueous hydraulic fluid composition comprising a first lubricant comprising at least one phospholipid and a second lubricant comprising an alkoxylate salt. The aqueous hydraulic fluid composition contains less than about 20% by weight (preferably none or substantially none) of an oil selected from the group consisting of mineral oils, synthetic hydrocarbon oils, and mixtures thereof. The use of alkoxylate salts provides increased lubricity and also acts as an emulsion stabilizer for the composition.

Description

FIELD OF THE INVENTION[0001]This invention relates to aqueous hydraulic fluid compositions, especially hydraulic fluid compositions that are suitable for use in blowout preventer devices used to control wellhead pressure of oil wells.BACKGROUND OF THE INVENTION[0002]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 also lower the coefficient of friction. To be effective, the compositions typically have sufficient antiwear, antiweld, and extreme pressure properties to minimize metal damage from metal-to-metal contact under high load conditions.[0003]Hydraulic fluids are usable in blowout preventer (BOP) devices which are used to control well-head pressure of an oil well that is being drilled and / or in marine environments such as in off-shore oil dril...

Claims

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Application Information

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IPC IPC(8): C09K8/04
CPCC09K8/04E21B33/064C09K8/08C09K2208/34Y10T137/0396
Inventor SMITH, IAN D.
Owner MACDERMID OFFSHORE SOLUTIONS
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