Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1992-12-07
1995-10-24
Tucker, Philip
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507103, 507136, C09K 706, C09K 702
Patent
active
054610281
DESCRIPTION:
BRIEF SUMMARY
This application is A 371 of PCT/EP91/01001 filed May 29, 1991.
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to novel drill-hole treatment agents which are fluid under normal conditions and have been composed by using an oil phase in combination. Referring to a characteristic example for treating agents of this kind, the invention is described hereinbelow by way of drilling fluids and drilling muds formed therewith. However, the field of application of the modification according to the invention of auxiliary liquids of the kind involved here is not limited thereto, while it also includes in particular the areas of spotting fluids, spacers, auxiliary liquids for workover stimulation and for fracturing.
Concerned by the invention are auxiliary liquids of the kind mentioned which are oil-based, i.e. which work using a continuous oil phase, as well as auxiliary agents wherein the oil phase has been emulsified in an especially aqueous continuous phase. Here, drilling fluids and drilling muds formed therewith are characteristic examples of the various possibilities.
There have been known, on the one hand, water-based drilling fluids having a content of from about 1 to 50% of emulsified oil phase--besides the other conventional auxiliary materials of such a drilling fluid--which are designated as emulsion fluids. On the other hand, there are being used to a wide extent in practice oil-based fluid systems wherein the oil constitutes the fluid phase or at least the predominant portion of the fluid phase. Here the so-called inverted drilling muds are of particular importance which, based on W/O emulsions, contain a dispersed aqueous phase in the continuous phase. The content of the dispersed aqueous phase usually is within the range of from about 5 to 50% by weight. The invention equally relates to both of the fields as mentioned here of the oil-based sweeping systems and of the water-based sweeping systems based on emulsions.
The use of the new fluid drilling-hole treatment agents is of particular importance for the exploitation of crude oil and natural gas, especially in the marine sector, while it is not limited thereto. The new systems may find general use in terrestrial drilling, for example in geothermal drilling, water drilling, in carrying out geo-scientific drilling and in drilling in the field of mining.
Prior Art
Liquid sweeping systems for rock-drilling to bring-up the removed drill cuttings have been known to restrictedly thickened fluid systems which may be assigned to one of the three following classes:
Merely aqueous drilling fluids, oil-based drilling fluid systems which, as a rule, are used as so-called inverted emulsion drilling muds, and the water-based O/W emulsions which contain a heterogeneous finely dispersed oil phase in a continuous aqueous phase.
Drilling fluids having a continuous oil base in general are composed as a three-phase system: Oil, water and finely divided solids. Therein the aqueous phase has been heterogeneously distributed in a finely dispersed state in the continuous oil phase. A multiplicity of additives is provided, more specifically emulsifiers, weighting agents, fluid-loss additives, alkali reserve, viscosity modifiers and the like. As to details, reference is made, for example, to the publications P. A. Boyd et al., "New Base Oil Used in Low-Toxicity Oil Muds", Journal of Petroleum Technology 1985, 137 to 152, and R. B. Bennett, "New Drilling Fluid Technology--Mineral Oil Mud" Journal of Petroleum Technology 1984, 975 to 981, as well as the literature quoted therein.
Drilling fluids comprised of water-based O/W emulsion systems with view to their utility properties occupy an intermediate position between the neat aqueous systems and the oil-based inverted fluids. Extensive substantial information is found in the pertinent technical literature; reference may be made, for example, to G. R. Gray and H. C. H. Darley, "Composition and Properties of Oil Well Drilling Fluids", 4th Edition, 1980/81, Gulf Publishing Co., Houston, and the vol
REFERENCES:
patent: 3642858 (1972-02-01), Frevel et al.
patent: 4374737 (1983-02-01), Larson et al.
patent: 4481121 (1984-11-01), Barthel
patent: 4504418 (1985-03-01), Langdon
Herold Claus-Peter
Mueller Heinz
von Tapavicza Stephan
Westfechtel Alfred
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
Tucker Philip
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