EP0675937A1 - Rheologisch gesteuerte fliess- und pumpfähige wässrige zubereitungen beispielsweise für die verwendung als wasserbasierte bohrschlämme - Google Patents

Rheologisch gesteuerte fliess- und pumpfähige wässrige zubereitungen beispielsweise für die verwendung als wasserbasierte bohrschlämme

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Publication number
EP0675937A1
EP0675937A1 EP94903830A EP94903830A EP0675937A1 EP 0675937 A1 EP0675937 A1 EP 0675937A1 EP 94903830 A EP94903830 A EP 94903830A EP 94903830 A EP94903830 A EP 94903830A EP 0675937 A1 EP0675937 A1 EP 0675937A1
Authority
EP
European Patent Office
Prior art keywords
water
regulators
flowable
pumpable
alcohols
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94903830A
Other languages
German (de)
English (en)
French (fr)
Inventor
Heinz Müller
Claus-Peter Herold
Stephan Von Tapavicza
Wolfgang Breuer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4302462A external-priority patent/DE4302462A1/de
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP0675937A1 publication Critical patent/EP0675937A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
    • C09K23/42—Ethers, e.g. polyglycol ethers of alcohols or phenols

Definitions

  • Rheologically controlled, flowable and pumpable aqueous preparations for example for use as water-based drill pipes
  • the invention relates to the field of rheology control of aqueous liquid phases with the use of viscosity formers based on finely divided swellable or non-swellable minerals of natural and / or synthetic origin.
  • Reliable rheology control from the ambient temperature to the range of higher is selected by the selection of novel regulators Temperatures - for example up to 300 ° C or above - is possible.
  • the teaching according to the invention is apparently based on an interaction between the finely divided mineral substances on the one hand and the regulators according to the invention described below.
  • the thickening of water-based systems using finely divided swellable or non-swellable clays and / or other layered silicate compounds of natural and / or synthetic origin is widely used in practice.
  • the most varied of work areas make use of the existing possibility of thixotropic thickening of aqueous or water-based liquid phases.
  • the areas of processing solid materials, in particular metals, the area of application of fire extinguishing agents and the use of thixotropically thickened liquid phases in water-based paints should be mentioned without claiming to be complete or paints, hydraulic fluids and the like.
  • thixotropically thickened water-based auxiliary fluids are used in the technology of geological drilling in the ground, but also in other contexts, for example as a ground support for excavations, in particular in diaphragm wall construction, shaft, well and caisson subsidence , used for pipe penetrations and the like.
  • a reference to the structural application of thixotropic liquid systems is, for example, F. Weiss "The Stability of Liquid-Supported Earth Walls" in Civil Engineering Practice, No. 70 (1967), W. Ernst & Sohn, Berlin-Munich.
  • Water-based drilling fluid systems which are thickened sufficiently by the addition of mineral viscosity formers - usually with the simultaneous use of suitable polymer compounds - without losing their flow and pumpability under shear stress and - adapted to the respective situation - additional dissolved, emulsified and / or containing suspended auxiliaries are used in a wide range.
  • suitable polymer compounds without losing their flow and pumpability under shear stress and - adapted to the respective situation - additional dissolved, emulsified and / or containing suspended auxiliaries are used in a wide range.
  • numerous other liquid auxiliaries in the field concerned - known, for example, under the terms stimulation, fracturing, spotting, MiHing or simply for cleaning - are water-based and thickened with the use of inorganic and / or organic viscosity formers.
  • earth boreholes are also to be understood broadly and encompasses both the area of the exploration of geological deposits, such as oil and / or natural gas, and any technical auxiliary boreholes, for example sub-tunnels, the so-called river crossing, the development of landfill areas. water drilling and the like.
  • the mineral viscosity formers used for rheology control in the context of aqueous drilling fluids are usually swellable clays of natural and / or synthetic origin, but finely divided, non-swelling minerals can also be used for thixotropic thickening.
  • Corresponding smectites such as montmorillonite, bentonite, beidelite, hectorite, saponite and stevensite may be mentioned as examples.
  • Attapulgite is another important auxiliary of the type concerned here. Reference is also made in this connection, for example, to US Pat. No. 4,664,843, in particular columns 5 and 6.
  • the water-swelling layered silicates known per se such as clays of the sodium bentonite type or also synthetic mineral compounds of the type described in EP-B 0260538, are used here together with the selected mixed hydroxide compounds with a garnet structure.
  • the teaching of this earlier application the disclosure of which is hereby also expressly made the subject of the present disclosure of the invention, builds on the surprising finding that these finely divided mineral auxiliaries of the structure type of the grenade with roughly 3-dimensional spatial network structure are effective tools in the The meaning of the rheology control is and can lead to a hitherto unknown combination of desired material properties in the property profile of the thickened aqueous liquid phases.
  • MMLHC ixed Metal Layered Hydroxide Compounds
  • the invention is based on the object of demonstrating rheology-controlling additional components of organic origin which enable partial or complete replacement of auxiliaries of the type mentioned, in particular based on thickening organic polymer compounds.
  • the rheology control should be possible and can be carried out effectively up to the high temperature range.
  • organic auxiliary components By also using specifically selected organic auxiliary components, the possibility should also additionally be retained of favorably influencing rheology-independent other important properties of such a drilling mud - for example its lubricating effect, its pH control and in particular the inertization against polyvalent cations.
  • the teaching according to the invention is based on the knowledge that selected lower alkoxylates of water-insoluble alcohols, which are insoluble in water at room temperature, apparently interact with the mineral particles which are very finely distributed in the aqueous phase. This interaction makes it possible to influence the rheological properties of the system in a controllable manner.
  • the targeted and adjustable thickening succeeds over the entire range of working temperatures occurring in practice, without unreasonably impeding the reduction in viscosity under shear stress.
  • the invention relates in a first embodiment to the use of lower alkoxylates of water-insoluble alcohols of natural and / or synthetic origin which are soluble in water at room temperature at room temperature - hereinafter also referred to as "regulators" - for effective thickening and control of the rheological properties of flowable and pumpable aqueous preparations of finely divided minerals also in the range of high temperatures, which are particularly useful as tools in the field of digestion of geological formations and / or for the processing of soil, e.g. B. for liquid-based excavations, can be used.
  • the invention relates to flowable and pumpable aqueous preparations which are rheologically controlled by the addition of finely divided minerals of natural and / or synthetic origin and which are additionally thickened by the addition of organic additives (regulators) and in particular to the above-mentioned compositions offer can be used as water-based auxiliary liquids.
  • the teaching according to the invention is characterized in that it contains lower alkoxylates of water-insoluble alcohols of natural and / or synthetic origin of the type described below in order to stabilize their rheological properties even in the range of elevated temperatures.
  • lower alkoxylates of water-insoluble alcohols in the broadest sense corresponding lower ethoxylates and / or lower propoxylates and / or lower butoxylates understood.
  • the invention finally relates to the partial or complete replacement of water-soluble or at least water-swellable polymer compounds customary today in water-based flowable preparations which are thickened with the use of swellable or non-swellable mineral finely divided solids and for example as water-based drilling muds but can also be used for comparable other purposes.
  • Water-insoluble alcohols with a higher carbon number and natural and / or synthetic origin are known basic raw materials for the production of various classes of surfactant compounds, in particular anionic and nonionic surfactants.
  • Nonionic surfactants are obtained from these water-insoluble fatty alcohols, in particular by alkoxylation with ethylene oxide and / or propylene oxide, the introduction of a sufficient amount of the particularly strongly hydrophilic EO residues ensuring the required balance between the hydrophobic and hydrophilic portions of the molecular structure becomes.
  • the classic surfactants of this type are O / W surfactant compounds with sufficiently pronounced hydrophilic molecular components which enable the surfactant components to be largely soluble in the aqueous phase at room temperature.
  • This turbidity is caused by segregation into two liquid phases, from where one is lower in surfactant and the other more rich in surfactant than the starting solution.
  • the turbidity temperature is dependent on the respective size of the hydrophobic and hydrophilic groups connected to one another in the molecule.
  • the temperature at which the segregation and thus the turbidity begins for a given concentration is called the "cloud point".
  • the cloud point of the 1% aqueous solution is usually given.
  • this turbidity temperature is a measure of the degree of alkoxylation and thus an important technical parameter.
  • relevant specialist literature see in this regard, for example, the applicant's publication "fatty alcohols, raw materials, processes and use”, in particular the subchapters H. Lange, MJ Schwuger "Physico-chemical properties of fatty alcohols and secondary products", subchapter 3.5 “segregation; cloud point ; Distribution coefficient "and J. Glas! "Use of fatty alcohols and secondary products", here in particular subsection 3.1 "Fatty alcohol polyglycol ether”.
  • the lower alkoxylates of water-insoluble alcohols to be used as regulators according to the invention are characterized by such a low degree of alkoxylation and thus the introduction of hydrophilic molecular constituents into the overall molecule that they fall within the range of the so-called borderline soluble compounds at room temperature, ie no clear water solubility here have.
  • Fatty alcohol alkoxylates of this type which are substituted for example on a hydrocarbon residue with 12 to 18 carbon atoms on average with 2 to 4 EO residues, are known commercial products for a wide variety of uses.
  • the cosmetic preparations contain anionic surfactants of the type of alkyl ether sulfates as the primary surfactant component, and it is described that the use of selected nonionic fatty alcohol ethoxylates with a limited degree of ethoxylation makes it possible to thicken the aqueous surfactant preparation.
  • the aim of such discussions is to influence the surfactant micelle structure.
  • isometric spherical micelles are to be converted to anisometric rod or disk micelles. Macroscopically, this manifests itself in an increase in the viscosity of the surfactant solution.
  • the clay / solids content of these suspensions is very high, in particular in the range from about 20 to 60% by weight, based on the water-containing mixture.
  • Drilling rinsing systems of this type cannot be compared with the comparatively low-solids, water-based drilling muds that were created within the scope of the invention.
  • Today's systems of this type use the structure- and rheology-related, in particular swellable clays in much smaller amounts, which are usually well below 10 to 15% by weight and preferably at most about 5% by weight, based on the overall system.
  • limit-soluble controllers of the type specified are used according to the invention, which are in the liquid phase at temperatures up to about 100 ° C. and in particular have pour and pour points below about 80 ° C.
  • Particularly important auxiliaries of the type defined according to the invention have pour and pour points below 50 ° C., preferably below 25 ° C. and in particular below 10 ° C.
  • the most important auxiliaries of the type concerned according to the invention are distinguished by pour and pour points below 0 ° C. They are therefore present in the temperature ranges usually present in practice as liquids, the processing of which can be carried out on site or metered in, for example, into water-based drilling fluid during operation, even under offshore conditions.
  • the regulators used according to the invention can furthermore be defined by their preferred cloud points - determined as a 1% by weight mixture in water. These cloud points are preferably below 25 ° C, suitably below 20 ° C and generally below 10 ° C. Controllers of the type indicated which are soluble in water and have cloud points below 0 ° C. can be particularly interesting representatives for the teaching according to the invention.
  • Important representatives for regulators in the sense of the invention are lower alkoxylates of aliphatic and / or ethylenically unsaturated alcohols having at least 6 C atoms, preferably having at least 8 to 10 C atoms.
  • Particularly suitable thickeners are derived from monofunctional alcohols in the range C ⁇ o-24.
  • Ci2_i8 » preferably in the range Ci2_i8 » , where these alcohols can be of natural and / or synthetic origin.
  • the alcohol molecules can be straight-chain, branched and / or cyclic in nature. They can be aliphatically saturated or mono- or poly-olefinically unsaturated. Aromatic systems are already less suitable for ecological reasons and accordingly are not preferred.
  • the limit-soluble regulators defined according to the invention are obtained from these water-insoluble alcoholic components by ethoxylation and / or propoxylation and / or butoxylation.
  • fatty alcohols can be converted to polyglycol ethers with ethylene oxide (E0) and / or propylene oxide (PO) and / or butylene oxide (B0) in the presence of catalysts.
  • E0 ethylene oxide
  • PO propylene oxide
  • B0 butylene oxide
  • the hydrophilicity or water solubility of these fatty alcohol derivatives increases and the oil solubility decreases. Correct matching of the hydrophilic EO chain and / or PO chain and / or BO chain to the oleophilic nature of the alcohol residue is therefore required for the border-soluble thickeners of the type concerned here, which are used according to the invention.
  • Regulators according to the invention should therefore each have shorter oligo-EO residues.
  • a particularly important class of regulators in the sense of the teaching according to the invention are the lower alkoxylates, in particular the lower ethoxylates, of fatty alcohols having 12 to 18 carbon atoms.
  • the regulators according to the invention are used in aqueous slurries of finely divided minerals, these minerals in a preferred embodiment are swellable in water, but may also not be swellable in nature.
  • the mineral substances can be natural and / or synthetic origin.
  • the general knowledge of the relevant expert is here determining how it is derived, for example, from the literature cited at the beginning.
  • clays such as bentonite, attapulgite, hectorite and / or saponite, or else mixtures thereof with mineral regulators, such as katoite or the “mixed metal layered” already mentioned above, as the mineral component (s) Hydroxide Co pounds "(MMLHC) used, with sodium bentonite being particularly preferred.
  • the viscosity formers based on mineral finely divided solids are usually used in amounts of at most about 15% by weight and in particular below about 10% by weight. Suitable amounts are, for example, in the range from about 1.5 to 9% by weight, preferably in the range from about 2 to 8% by weight.
  • amounts of bentonite of about 2 to 6% by weight, based on the aqueous phase are useful and customary.
  • Highly effective mineral thickeners of synthetic origin which can also be used in much smaller quantities, are described, for example, in EP-B 0260538, already cited at the beginning and made the subject of the disclosure of the invention.
  • the amount of the limit solvable regulators used in the sense of the definition given in the description of the invention to the amount of the mineral fine-particle thickener components used.
  • the organic regulator component (s) it is preferred to use the organic regulator component (s) in at most approximately the same amounts as the finely divided clays.
  • the organic regulators are preferably used in smaller amounts than the clays, mixing ratios (weight fractions) of regulator / ton in the range from 0.01 / 1 to 0.8 / 1 and preferably in the range from approximately 0.05 / 1 to 0.5 / 1 can be particularly preferred.
  • the organic regulators according to the invention frequently in amounts of up to about 5% by weight, based on the water-based system - and will preferably be used in amounts of up to about 3% by weight.
  • the regulator components according to the invention can trigger permanent effects which stabilize the rheology.
  • upper limit values of about 1.5 to 2% by weight, based on the flowable and pumpable aqueous preparation, will often be sufficient for the amount of organic regulator to be used.
  • the stabilization of the mineral thickener system in the sense of the use according to the invention of regulators of the type described is so thorough that there is at least an equivalent replacement for the polymer compounds.
  • the known high thermal stability of nonionic fatty alcohol alkoxylates which enables the stabilization principle according to the invention to be used over the wide temperature range occurring in practice, for example up to 300 ° C. or even above.
  • the use of limited amounts of selected polymer compounds is understandably within the scope of the teaching according to the invention.
  • Alkoxylates are suitable which, according to conventional methods, are equipped with a comparatively broad statistical distribution of the chain length of the E0, P0 and / or BO residues. But they are also suitable Alkoxylates of the so-called "NRE" range (narrow-range ethoxylates) produced by more modern processes.
  • preferred alcohol alkoxylates are provided with up to 7 alkoxy groups, preferably with up to 4 alkoxy groups (in each case statistical average) and that particularly suitable regulators or thickeners are C - ⁇ - i ⁇ 'fatty alcohol-EO ⁇ compounds , where x represents a numerical value in the range from 1 to 3.
  • the teaching according to the invention is particularly important in connection with the construction of water-based borehole treatment agents, in particular drilling fluids, which, together with the thickened aqueous phase, contain a disperse organic, finely emulsified oil phase which is, in particular, flowable at working temperatures.
  • Drilling fluids of this type are known to be O / W emulsions which, in terms of their use properties, occupy an intermediate position between purely aqueous systems and oil-based invert fluids. Detailed factual information can be found, for example, in the previously cited book George R. Gray / O.C.H.
  • O / W drilling fluids of this type are usually 3-phase systems made from oil, water and finely divided solids.
  • Such O / W emulsions can be of particular importance within the scope of the invention.
  • the object These documents are expressly also made the subject of the present disclosure of the invention regarding the embodiment concerned here.
  • auxiliaries for inhibiting drilled rock with increased sensitivity to water can be of particular importance.
  • the water-soluble salts known from the prior art as additives to water-based drilling fluids come into consideration here.
  • these are halides of the alkali and / or alkaline earth metals, and corresponding potassium salts - if appropriate in combination with lime - can be of particular importance.
  • More recent developments include the use of water-soluble polyalcohols, such as polyglycols, the use of glycerol, crosslinked and / or uncrosslinked oligo- and / or polyglycerols and comparable compounds.
  • the viscosity-controlled water-based drilling aids can contain all the additives intended for comparable mud types. These additives can be water-soluble, oil-soluble and / or water- or be oil-dispersible.
  • Known additives in water-based rinses, in particular O / W emulsion rinses are, for example, emulsifiers, fluid-loss additives, alkali reserves, weighting agents, agents for inhibiting the undesired water exchange between drilled formations and the water-based rinsing liquid, wetting agents for better absorption of the emulsified oil phase Solid surfaces, disinfectants and the like.
  • the controllers are used together with defoamers or foam inhibitors. This embodiment can be particularly important in the
  • the defoamers are generally used together with the regulators in the sense of the definition according to the invention in subordinate quantities, based on the quantity of regulator used in each case.
  • the defoamer can be used in amounts of about 1 to 50% by weight and preferably in amounts of about 5 to 30% by weight, based in each case on the amount of regulator used in the sense of the definition according to the invention .
  • an aqueous suspension containing the specified amount of bentonite is prepared by vigorously stirring the powdered mineral into the water phase.
  • the pH value of 11 is adjusted with 30% sodium hydroxide solution.
  • the bentonite suspension prepared in this way is left overnight at room temperature.
  • the following measured values are determined as rheological characteristic values, which are introduced and meaningful in the technology of flowable aids for geological drilling - in particular in the identification of the rheological properties of drilling muds:
  • the following examples first provide information about the combination of substances on which the measurements are based.
  • the measured values obtained during the testing are then summarized in a table.
  • a 3.5% by weight sodium bentonite suspension (12 lbs / bbl, pH 11) is first prepared as a blank value in the manner indicated. Your rheological data are determined in the unaged and in the aged state.
  • the bentonite suspension as regulator in the sense of the definition according to the invention is added the Ci2 / 14-ethoxylate sold by the applicant under the trade name "Dehydol LS2" with a normal statistical EO distribution and an EO mean value of 2 and is also intensively incorporated.
  • the regulator is used in an amount of 0.5% by weight (1.5 lb / bbl).
  • the rheological data of this approach are determined in the unaged and in the aged state. Table 1 below summarizes the measured values determined on the blank sample and on the material formulated according to the invention. Table 1
  • Example 2 In a series of comparative experiments, the two experimental approaches according to Example 2 are examined for their stability against the addition of increasing amounts of calcium chloride.
  • the bentonite suspension containing CMC - which was originally produced using tap water - is mixed in 3 separate batches with 0.125% by weight, 0.25% by weight and finally 0.5% by weight of CaCl2 . All approaches are aged.
  • the plastic viscosity (PV) and the yield point (YP) are determined on the aged suspensions. The values are summarized in Table 3 a below.
  • the bentonite suspension composed according to the invention and regulated with "Dehydol LS2" is also mixed with calcium chloride in separate samples and aged.
  • the following amounts of calcium chloride are used: 0.25% by weight, 0.5% by weight and 1.0% by weight.
  • the rheology data for PV and YP measured on the aged samples are contained in Table 3 b below.
  • a dry powder is used as the inorganic regulator mixture in the sense of the older German patent application mentioned. It consists of the substance mixture defined below: 90 wt .-% of a very weak silicate modified Katoits - SiO 4 content based on the silicate-free Katoitmaschine Ca3Al2 (0H) i2 less than 0.1 S ⁇ '04 units
  • Variant A To the bentonite suspension (12 lb / bbl sodium bentonite, pH 11), the regulator according to the invention based on the fatty alcohol ethoxylate is first added and mixed intensively with it.
  • the commercial product of the applicant "Dehydol LS3" is used as a regulator of this type.
  • the mineral regulator mixture according to the earlier application is then intimately mixed with the suspension now present.
  • the rheological values are determined on the non-aged and on the aged material.
  • Variant B The work of variant A is repeated. Now, however, the mineral regulator according to the older application is first incorporated into the aqueous bentonite suspension and the regulator according to the invention based on fatty alcohol ethoxylate (LS3) is only mixed in after its intensive mixing. Here, too, the rheological data are determined on the unaged and on the aged material.
  • LS3 fatty alcohol ethoxylate
  • the bentonite base suspension (12 lb / bbl, pH 11) was mixed with 0.5 lb / bbl of the mineral regulator mixture and 0.9 lb / bbl of the regulator based on fatty alcohol ethoxylate.
  • the applicant uses the commercial product "LS2" as a regulator based on fatty alcohol ethoxylate.
  • Table 5 summarizes the rheological data determined.
  • Variant B unaged 20 177 55 51 aged 11 78 25 37
  • variant B leads to a significantly greater increase in the rheological values than variant A.
  • a bentonite suspension is produced in the sense of the teaching of Example 5, variant B, but now with an increased amount of regulator based on fatty alcohol ethoxylate.
  • the finished rinse contains the following components: 12 lb / bbl bentonite, pH 11; 0.5 lb / bbl of the mineral regulator mixture and 1.3 lb / bbl of the regulator according to the invention ("Dehydol LS2").
  • the rheological data are determined on the non-aged and on the samples aged at 250 ° F (121 ° C) and for 16 hours at 350 ° F (177 ° C). The dimensions obtained are summarized in Table 6 below.
  • a 3.5% by weight bentonite suspension (pH 11) is mixed once with 0.5% by weight "Dehydol LS2", and secondly, instead of this last-mentioned thickener, a corresponding material with a narrowed EO distribution is used (NRE type) used.
  • the commercial product "Arlypon F” is used here as a controller.
  • Foam inhibition was investigated in bentonite suspensions which contained dehydol LS 2 as the regulator according to Example 1.
  • Various organic compounds serve as defoamers.
  • 3.5% by weight sodium bentonite suspensions were again used, the pH of which was adjusted to 11 in each case.
  • the following mixtures were examined:
  • Blank value I spec. Density of the deaerated bentonite suspension without mechanical stress
  • Blank value II spec. Density of the bentonite suspension after mechanical stress (as stated above)

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Dispersion Chemistry (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
EP94903830A 1992-12-28 1993-12-20 Rheologisch gesteuerte fliess- und pumpfähige wässrige zubereitungen beispielsweise für die verwendung als wasserbasierte bohrschlämme Withdrawn EP0675937A1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4244267 1992-12-28
DE4244267 1992-12-28
DE4302462 1993-01-29
DE4302462A DE4302462A1 (de) 1992-12-28 1993-01-29 Rheologisch gesteuerte fließ- und pumpfähige wäßrige Zubereitungen beispielsweise für die Verwendung als wasserbasierte Bohrschlämme
PCT/EP1993/003606 WO1994014918A1 (de) 1992-12-28 1993-12-20 Rheologisch gesteuerte fliess- und pumpfähige wässrige zubereitungen beispielsweise für die verwendung als wasserbasierte bohrschlämme

Publications (1)

Publication Number Publication Date
EP0675937A1 true EP0675937A1 (de) 1995-10-11

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EP (1) EP0675937A1 (no)
AU (1) AU677815B2 (no)
CA (1) CA2152778A1 (no)
NO (1) NO951618D0 (no)
WO (1) WO1994014918A1 (no)

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IT201800007438A1 (it) * 2018-07-23 2020-01-23 Additivo schiumogeno a basso impatto ecotossicologico per il condizionamento del terreno in presenza di scavo meccanizzato

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NO951618L (no) 1995-04-27
NO951618D0 (no) 1995-04-27
AU677815B2 (en) 1997-05-08
CA2152778A1 (en) 1994-07-07
WO1994014918A1 (de) 1994-07-07
AU5813494A (en) 1994-07-19

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