Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1995-01-27
1997-09-02
Lovering, Richard D.
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
252312, 25231501, 2523155, 507109, 507111, 507113, 507117, 507208, 507269, 507121, 507140, C09K 702, C09K 704, C09K 706, B01J 1300
Patent
active
056631227
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates generally to the rheology control of aqueous liquid phases using viscosity builders based on swellable minerals of natural and/or synthetic origin.
This application is a 371 of PCT/EP93/01902, filed Jul. 19, 1993, which claims priority based on Federal Republic of Germany application P 4224 537.0 filed Jul. 27, 1992.
The thickening of water-based systems using fine-particle swellable clays and/or other layer silicate compounds of natural or synthetic origin is widely used in practice. The various fields of application involved utilize the possibility which this affords of thixotropic thickening of the aqueous or water-based liquid phases. The treatment of solid materials, particularly metals, the field of fire extinguishing materials, the use of thixo-tropically thickened liquid phases in water-based paints or coating compositions, hydraulic liquids and the like are mentioned here without any claim to completeness. Totally different applications can be found, for example, in the production of cosmetic preparations, in the production of water-based active-substance preparations in the form of ointments or gels and numerous other fields.
Water-based auxiliary liquids thixotropically thickened to a more or less considerable extent are widely used in the technology of geological drilling and other terrestrial drilling operations and also for other applications, for example as ground supports in digging operations, more particularly in slotted wall construction; in shaft, well and caisson sinking; in the driving through of pipes and the like. A literature reference on the subject of the constructional application of thixotropic liquid systems is, for example, F. Weiss, "Die Standfestigkeit flussigkeitsgestutzter Erdwaande" [Title in English: The Stability of Earthen Wails supported by Liquids] in Bauingenieur-Praxis [Title in English: Structural Engineering Practice], No. 70 (Verlag W. Ernst & Sohn, Berhn-Munchen, 1967). Water-based drilling fluids that are sufficiently thickened by the addition of mineral viscosity generators without losing their flowability or pumpability under shear stressing and that--depending on the particular situation--contain additional dissolved, emulsified and/or suspended auxiliaries are widely used. However, many other liquid auxiliaries used in the field m question--for example for stimulation, fracturing, spotting or simply for cleaning--are water-based liquid phases which have been thickened with inorganic viscosity generators of the type in question; see for example the printed publications MANUAL OF DRILLING FLUIDS TECHNOLOGY (NL Baroid/NL Industries, Inc., 1985) and A. T. Bourgoyne Jr, et al., Applied Drilling Engineering (Society of Petroleum Engineers, Richardson, Tex., 1986).
The present invention as described hereinafter is largely concerned with, but is by no means limited to, auxiliary liquids for use in the field of terrestrial drilling. In the context of the invention, the expression "terrestrial drilling" is also meant to be broadly interpreted and encompasses both the development of geological deposits, such as petroleum and/or natural gas, and auxiliary drilling, for example, for undertunneling, river crossing, the opening of deposit fields, water drilling and the like.
The mineral viscosity generators used for controlling the rheology of aqueous drilling fluids are swellable clays of natural and/or synthetic origin. Examples are corresponding smectites, such as montmorillonite, bentonitc, beidellite, hectoritc, saponite and stevensite. Attapulgite is another important water-swellable auxiliary of the type in question. A number of proposals are concerned with the synthetic production of fine-particle clay-like minerals, more particularly corresponding compounds of the hectoritc and/or saponite type, cf. DE-A-16 67 502 and in particular EP-B-0 260 538. The disclosure of the last document in particular, which describes a development of the assignee of this application, is hereby included as part of the disclosure of the
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Breuer Wolfgang
Herold Claus-Peter
Kuhm Peter
Mueller Heinz
von Tapavicza Stephan
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lovering Richard D.
Szoke Ernest G.
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