Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1993-04-28
1994-09-20
Geist, Gary
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507136, 507138, C09K 702
Patent
active
053489381
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention discloses new drilling fluids and invert drilling muds based thereon, which are distinguished by high ecological acceptability and at the same time good storage and application properties. An important area of application for the new drilling fluid systems is in off-shore wells for the development of petroleum and/or natural gas deposits, the aim of the invention being particularly to make available industrially usable drilling fluids with high ecological acceptability. The use of the new drilling fluid systems has particular significance in the marine environment, but is not limited thereto. The new mud systems can be put to quite general use even in land-based drilling, for example, in geothermal wells, water bore-holes, in the drilling of geoscientific bores and in drilling for the mining industry. Here too it is essentially true that associated ecotoxic problems are substantially simplified by the ester-based drilling-oil fluids selected according to the invention.
2. Discussion of Related Art
Oil-base drilling fluids are generally used in the form of so-called invert-emulsion muds, which consist of a three-phase system: oil, water and finely particulate solids. These are preparations of the W/O-emulsion type, i.e. the aqueous phase is distributed as a heterogeneous fine dispersion in the continuous oil phase. A number of additives can be used to stabilize the system as a whole and to confer on it the desired application properties, particularly emulsifiers or emulsifier systems, weighting agents, fluid-loss additives, alkali reserves, viscosity regulators and the like. For details, refer, e.g., to the publication by P. A. Boyd et al., "New Base Oil Used in Low-Toxicity Oil Muds" Journal of Petroleum Technology, 1985, 137 to 142, and R. B. Bennett, "New Drilling Fluid Technology--Mineral Oil Mud" Journal of Petroleum Technology, 1984, 975 to 981 and the literature cited therein.
The importance of ester-based oil phases in reducing the problems created by such oil-base muds has been recognized for some time in the relevant field of technology. For example, U.S. Patent Specifications 4,374,737 and 4,481,121 disclose oil-base drilling fluids in which non-polluting oils are to be used. The following are mentioned as of equal value as the non-polluting oils-mineral oil fractions which are free from aromatic hydrocarbons, and vegetable oils, such as peanut oil, soybean oil, linseed oil, corn oil, rice oil or even oils of animal origin, such as whale oil. These named ester oils of vegetable and animal origin are all, without exception, triglycerides of natural fatty acids, which are known to be of high environmental acceptability, and are clearly superior ecologically to hydrocarbon fractions--even when these do not contain aromatic hydrocarbons.
Interestingly enough, however, not one of the examples in the above U.S. Patent Specifications describes the use of such natural ester oils in invert-drilling fluids of this type. In every case, mineral oil fractions are used as the continuous oil phase. Oils of vegetable and/or animal origin are not considered for practical reasons. The rheological properties of such oil phases cannot be controlled over the wide temperature range generally required in practice, from 0.degree. to 5.degree. C. on the one hand, up to 250.degree. C. on the other.
THE APPLICANT's EARLIER PROPOSALS
Ester oils of the type in question do not in fact behave in the same way in practice as the previously used mineral oil fractions based on pure hydrocarbons. Ester oils are subject to partial hydrolysis in practical use, particularly in W/O-invert drilling muds. Free carboxylic acids are formed as a result. The Applicant's earlier Applications P 38 42 659.5 and P 38 42 703.6 U.S. Ser. Nos. 07/452,457 and 07/452,988 describe the problems caused thereby and give proposals for their solution. Further types of usable ester oils are disclosed in the earlier Patent Applications P 39 07 391.2 and P 39 07 392.0 (U.S. application Se
REFERENCES:
patent: 1999147 (1935-04-01), Ambrose et al.
patent: 2661334 (1953-12-01), Lummus
patent: 3062740 (1962-11-01), Reddie et al.
patent: 3244638 (1966-04-01), Foley et al.
patent: 3338830 (1967-08-01), Stokes et al.
patent: 3761410 (1973-09-01), Mondshine et al.
patent: 4409108 (1983-10-01), Carney et al.
patent: 4631136 (1986-12-01), Jones, III
patent: 4839096 (1989-06-01), Dennis et al.
Gray et al, Composition and Properties of Oil Well Drilling Muds (Houston, Gulf Publishing Co., 1980) pp. 319-324.
Peters, R., "Alcohols, Higher Aliphatic" in: Kirk-Othmer Encyclopedia of Chemical Technology (1991 ed.), vol. 1, pp. 885-887.
Herold Claus-Peter
Mueller Heinz
von Tapavicza Stephan
Geist Gary
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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