Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1996-12-13
1999-02-09
Wu, Shean C.
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507103, 507116, 507138, 507139, 507905, C09K 700, C09K 702
Patent
active
058694340
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to new borehole servicing preparations which flow freely under normal conditions and which are made up using an oil phase. As a characteristic example of servicing preparations of the type in question, the invention is described hereinafter with reference to drilling fluids and drilling muds based thereon which may be used both in land-supported drilling and in offshore drilling. However, the modification according to the invention of auxiliary fluids of the type in question is by no means limited to this particular application. The many other auxiliary fluids used in the specialist field in question, for example spotting fluids, spacers, packer fluids, auxiliary workover, stimulation and fracturing fluids, may also be correspondingly modified.
The invention is concerned both with auxiliary fluids of the type mentioned which are based on oils, i.e. which work with a continuous oil phase, and with auxiliaries in which the oil phase is emulsified in a continuous phase, more particularly an aqueous continuous phase. Drilling fluids and drilling muds based thereon are characteristic examples of the various corresponding possibilities.
On the one hand, water-based drilling fluids containing around 1 to 50% of emulsified oil phase in addition to other typical auxiliaries encountered in drilling fluids are known and are also referred to as o/w emulsion fluids. On the other hand, oil-based drilling fluids in which the oil forms the fluid phase or at least a substantial part of the fluid phase as a continuous oil phase are widely used in practice. Particular significance is attributed in this regard to so-called invert drilling muds which--on the basis of w/o emulsions--contain a disperse aqueous phase in the continuous oil phase. The content of disperse aqueous phase is typically in the range from about 5-10% by weight to about 50-60% by weight. In addition to these w/o invert drilling muds, however, there are also the so-called true oil muds of which the liquid phase consists almost entirely of a continuous oil phase and which contain at most small quantities--normally not more than 5 to 10% by weight--of dispersed aqueous phase.
The invention relates equally to the two fields in question, namely oil-based drilling fluids and water-based drilling emulsions.
The use of the new borehole servicing fluids is of particular significance for the development of oil and gas occurrences, particularly in the marine sector, but is by no means limited to this particular field of application. The new systems may also be generally used in land-supported drilling operations, for example in geothermal drilling, water drilling, geoscientific drilling, so-called river-crossing drilling and mine drilling. Irrespective of this broad range of applications of the principles according to the invention, the technical teaching is described hereinafter with reference to drilling muds.
2. Discussion of Related Art
It is known that drilling fluids for sinking bores in rock and bringing up the rock cuttings are slightly thickened, fluid systems which may be assigned to one of the following three classes:
water-based drilling fluids,
oil-based drilling fluids (true oil muds and so-called w/o invert emulsion muds) and
water-based o/w emulsions which contain a heterogeneous finely dispersed oil phase in a continuous aqueous phase.
Drilling fluids on a continuous oil basis, more particularly w/o invert emulsions, are generally made up of a three-phase system, namely: oil, water and fine-particle solids. The aqueous phase is present in the continuous oil phase in, heterogeneous fine dispersion. There are a whole range of additives, including in particular emulsifiers, weighting agents, fluid loss additives, alkali reserves, viscosity regulators and the like. Full particulars can be found, for example, in the Article by P. A. Boyd et al. entitled "New Base Oil Used in Low-Toxicity Oil Muds" in Journal of Petroleum Technology, 1985, 137 to 142 and in the Article by R. B. B
REFERENCES:
patent: 4374737 (1983-02-01), Larson et al.
patent: 4481121 (1984-11-01), Barthel
patent: 5106516 (1992-04-01), Mueller et al.
patent: 5189012 (1993-02-01), Patel et al.
patent: 5194422 (1993-03-01), Mueller et al.
patent: 5232910 (1993-08-01), Mueller et al.
patent: 5252554 (1993-10-01), Mueller et al.
patent: 5254531 (1993-10-01), Mueller et al.
patent: 5432152 (1995-07-01), Dawson et al.
patent: 5461028 (1995-10-01), Mueller et al.
patent: 5663122 (1997-09-01), Mueller et al.
patent: 5755892 (1998-05-01), Herold et al.
New Base Oil Used in Low-Toxicity Oil Muds, Journal of Petroleum Technology, 1985, pp. 137 to 142.
New Drilling Fluid Technology--Mineral Oil Mud, Journal of Petroleum Tech, 1984, pp. 975-981.
Composition and Properties of Oil Well Drilling Fluids, 4th Ed., 1980/81, Gulf Publishing Co., Houston.
Applied Drilling Engineering, First Printing, Soc. of Petroleum Engineers, Richardson, pp. 76-81, 1986.
Degradation of Unsaturated Hydrocarbons by Methanogenic Enrichment Cultures in FEMS Microbiology Ecology 31 (1985), 69-77, published by Elsevier.
Linear Alpha Olefins of Chemical Economics Handbook--SRI International (1993).
Manual of Drilling Fluids Technology, NL-Baroid, London, GB, 1979.
Drilling Fluid Components, Chapter 11 of Composition and Properties of Oil Well Drilling Fluids.
Petroleum Engineer International, Sep. 1987, 32-40.
Fies Matthias
Herold Claus-Peter
Mueller Heinz
von Tapavicza Stephan
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
Wu Shean C.
LandOfFree
Free-flowing borehole servicing preparations containing linear . does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Free-flowing borehole servicing preparations containing linear ., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Free-flowing borehole servicing preparations containing linear . will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1948408