CA1153274A - Method for breaking petroleum emulsions and the like using thin film spreading agents comprising a polyether polyol - Google Patents

Abstract

TITLE: METHOD FOR BREAKING PETROLEUM EMULSIONS AND THE
LIKE USING THIN FILM SPREADING AGENTS
COMPRISING a POLYETHER POLYOL

ABSTRACT OF THE INVENTION

The invention relates to a method of breaking petroleum emulsions, by utilization of a homogeneous, micellar solution of a water-insoluble thin film spreading agent comprising:
(a) from between about 5% and about 75% by weight of a poly-ether polyol; (b) from between about 2% and about 30% by weight of a hydrotropic agent; (c) from between about 2% and about 30% by weight of an amphipathic agent; and (d) from between about 15% and about 90% by weight of water.

Description

llS327~

BACKGROUND OF THE INVENTI ON
1. FIELD OF THE INVENTION: The invention relates to a new and improved micellar solution of a thin film spreading agent comprising a polyether polyol which is particularly useful for breaking or preventing petroleum emulsions. More specifically, the invention relates to the use of a composition in which water replaces all or a substantial part of the organic solvents formerly required for preparation of liquid solutions of this interfacially active compound.

2. DESCRIPTION OF THE PRIOR ART: One of the principal uses of the present composition is in the breaking of petroleum emulsions to permit the separation thereof into two bulk phases.
Much of the crude petroleum oil produced throughout the world is accompanied by some water or brine which originates in or adjacent to the geological formation from which the oil is produced. The amount of aqueous phase accompanying the oil may vary from a trace to a very large percentage of the total fluid produced. Due to the natural occurrence in most petro-leum of oil-soluble or dispersible emulsifying agents, much of the aqueous phase produced with oil is emulsified therein, forming stable water-in-oil emulsions.
The literature contains numerous references to such emulsions, the problems resulting from their occurrence, and the methods employed to break them and separate salable petro-leum. See, for example, "The Technology of Resolving Petroleum Emulsions" by L. T. Monson and R. W. Stenzel, p. 535 et seq in Colloid Chemistry Vol VI, Ed. by Jerome Alexander, Rheinhold Publishing Corp., New York (1946) and "Interfacial Films Affecting the Stability of Petroleum Emulsions" by Chas. M.
Blair, Jr. in Chemistry and Industry (London), p. 538 et seq.
(1960L.
Early demulsifiers used to resolve petroleum emulsions ~153274 were water-soluble soaps, Twitchell reagents, and sulfonated glycerides. These products were readily compounded with water to Eorm easily pumpable liquids and were conveniently applied by pumping into flow lines at the well head or by washing down the casing annulus with water to commingle with well fluids prior to their flow to the surface. These products, however, were effective only at relatively high concentrations and their use added substantially to the cost of production.
Some time ago, it was discovered that certain lightly sulfonated oils, acetylated caster oils and various polyesters, all of which were insoluble in water but soluble in alcohols and aromatic hydrocarbons, were much more effective in breaking emulsions. Accordingly, essentially all commercial demulsifier development has led to production of agents which are insoluble in both water and petroleum oils and have other properties to be described below which cause them to spread at oil-water interfaces to form very thin, mobile films which displace any emulsifying agent present in the oil to allow coalescence of dispersed water droplets. Generally, such interfacially active ~O compounds are hereafter referred to as Thin Film Spreading Agents, or "TFSA's". In the past, these have had to be com-pounded with and dissolved in alcohols or hlghly aromatic hydrocarbon olvents in order to produce readily applied liquid compositions. A wide variety of such compositions are required to treat the many different emulsions encountered throughout the world.
While present TFSA compositions are highly effective, being, perhaps, up to fifty to a hundred times more effective per unit volume than the original water-soluble demulsifiers, they suffer serious practical deficiencies because of their solubility characteristics. For example, alcohols and the aromatic hydrocarbons, which are required for preparation of ~lS;~;~7~

liquid, pumpable compositions, are quite expensive, today approaching in cost that of the active demulsifier ingredient itself. Further, such solvents are flammable and thus create safety problems and entail more expense in shipping, storing and use. The low flash point flammability can be improved by using high boiling aromatic solvents, but these are increasing-ly rare, expensive and dangerous from the standpoint of car-cinogenicity and dermatological effects.
S~ill further, present demulsifiers cannot generally be used in a subterranean oil or gas well, injection well, or the like, since they cannot be washed down with either water (or brine~ or a portion of the produced oil, and, being viscous liquids which are required in very small amounts, they cannot be reliably and continuously delivered several thousand feet down at the fluid level in a typical well without use of elaborate and expensive delivery means.
Other applications of TFSA compositions would be facili-tated if they were readily soluble or dispersible in water.
For example, much heavy, viscous oil is produced in the United States by steam injection procedures. Typically, wet steam is injected into the oil producing strata for several weeks in order to heat the oil, lower its viscosity and increase reservoir energy. Steam injection is then stopped and oil is flowed or pumped from the bore hole which was used for steam injection. Much of the water resulting from condensation of the steam is also produced with the oil in emulsified form.
Since emulsions are more viscous than the external phase at the same temperature, and thus create increased resistance to flow, productivity of the steamed wells can be improved by injecting a water-soluble demulsifier into the wet steam during the steam injection period to prevent emulsion forma-tion. See, for example, U.S. Patent 3,396,792, dated April 1, ~153274 1966, to F. D. Muggee. At present, the requirement of water solubility seriously limits the choice of demulsifiers for use in steam or water injection to the relatively inefficient compositions.

- 4a -~' As disclosed in my co-pending Canadian applications, Serial Number 353,Z51, filed June 3, 1980 and entitled "Met~od of Recover-ing Petroleum From A Subterranean Reservoir Incorporating A Polyether Polyol", Serial Number 353,232, filed June 4, 1980, and entitled "Method of Recovering Petroleum From A Subterranean Reservoir Incorporating Resinous Polyalkylene Oxide Adducts", Serial Number 353,250, filed June 3, 1980, and entitled "Method Of Recovering Petroleum From A Subterranean Reservoir Incorporating An Acylated Polyether Polyol", and Serial Number 353,233, filed June 3, 1980, and entitled " Method of Recoveirng Petroleum From A
Subterranean Reservoir Incorporating Polyepoxide Condensates Of Resinous Polyalkylene Oxide Adducts And Polyether Polyols", TFSA's are useful in processçs for enhanced recovery of petroleum.
Used in such processes involving displacement of residual oil by aqueous solutions, polymer solutions and other aqueous systems, these agents act to increase the amount of oil recovered. Such action possibly arises from their ability to further water wetting of reservoir~rock, lessen the viscosity of the oil-water inter-facial layer and promote coalescence of dispersed droplets of either water or oil in the other phase.
By use of the present aqueous micellar solutions, the intro-duction of TFSA into aqueous displacement or flooding fluids is greatly facilitated. In addition, the present micellar solu~ions, per se, or in combination with other components, can be used as ;;~75 the flooding agent or as a pretreating bank or slug ahead of other aqueous fluids.
Other applications for the present TFSA micellar solutions in-clude their use as flocculation aids for finely ground hematite and ~agnetite ores during the desliming step of ore beneficiation, as additives for improving the oil removal and detergcnt action of cleanin~ compositions and detergents designed for use on polar :.

~.,~~~

~153274 materials, for the improvement of solvent extraction processes such as those used in extraction of antibiotic products from aqueous fermentation broths with organic solvents, for the improvement of efficiency and phase separation in the purifica-tion and concentration of metals by solvent extraction with organic solutions of metal complex-forming agents, and as :-assistants to improve the wetting and dying of natural and synthetic fibers and for other processes normally involving the interface between surfaces of differing polarity or wetting characteristics.

SUMMARY OF THE INVENTION
A primary object of the present invention is to provide aqueous, liquid compositions of these TFSA' s having new and useful characteristics which allow production of: petroleum emulsion breakers and emulsion preventing compositions free or relatively free of highly flammable and environmentally objectionable aromatic hydrocarbons; compositions having a comparatively low cost; compositions which are soluble or dispersible in water and which, therefore, can often be applied by more effective methods than can existing products; composi-tions which can be used in enhanced recovery operations such as steam flooding and aqueous medium flooding where present products cannot be readily applied; and compositions which can , :-: be compounded with water-soluble reagents of other types, such as corrosion inhibitors, wetting agents, scale inhibitors, biocides, acids, etc., to provide multipurpose compounds for i~
~ use in solving many oil well completion, production, trans-portation and refining problems.
In accordance with the present invention, these aims are accomplished by means of amphipathic agents which are capable of forming micellar solutions and which by this mechanism or . .

llS3274 other undefined actions, combined with those of a second essential component which will be referred to as a hydrotropic agent, are able to form homogeneous aqueous solutions contain-ing a relatively wide range of concentrations of TFSA.

DESCRI~TION OF THE PREFERRED EMBODIMENTS
The TFSA compositions of the present invention can be broadly categorized by the following general characteristics:
1. Solubility in water and isooctane at about 25C
is less than about 1~ by volume;
2. Solubility parameter at about 25C is in the range of from between about 6.8 to about 8.5, with a majority in the range of from between 7.0 and about 7.9; and

3. Spread at the interface between white, refined mineral oil and distilled water to form films having a calculated thickness no greater than about 20 Angstroms at a spreading pressure of about 16 dynes per cm.
TFSA compositions having these properties are generally organic polymers or semi-polymers having molecular weights ranging from about 2,000 to about 100,000 and having stru¢-tures containing a multiplicity of distributed hydrophilic and hydrophopic moieties arranged in linear or planar arrays which make them surface active and lead to their adsorption at oil-water interfaces to form very thin films.
Unlike most commonly encountered surface-active compounds, the present TFSA appears to be incapable of forming a micelle in either oil or water. The distributed and alternating occurrence of polar and nonpolar or hydrophilic and hydrophobic groups in the molecule apparently prevents the kind of organization required for micelle formation and thus impairs . ~

1~53274 dispersion or solution in either water or low polarity organic sol~rents .
The TFSA's useful in the present invention have thepreviously recited properties:
l The solubilitY in water and in isooctane at about .

25C is less than about 1% by volume.
Solubility tests may be run by placing a l ml sample (or the weight of solid product calculated to have a volume of l ml) in a graduated cylinder o of the type which may be closed with a ground glass stopper. Thereafter place 99 ml of water in the cylinder, close, place in a 25C water bath until thermal equilibrium is reached, and remove from the bath and shake vigorously for one hour. Return the sample to the bath for five minutes and then repeat the shaking procedure. Finally, return the sample to the bath and allow it to stand quietly for one hour. The cylinder contents should be carefully examined and any cloudiness or opacity ~o of the liquid phase or the appearance of any sediment or undissolved material in the cylinder noted, thus indicating that the sample satisfied the requirement for insolubility in water.
Isooctane solubility is determined similarly by substituting this hydrocarbon for the water used above.
2. The Solubi_it~ Parameter (S.P.) at about 25C is from between about 6,9 and about 8.5, inclusive.
_ Methods of de~ermination of solubility parameter ;O are disclosed in Joel H. Hildebrand, "The Solubility of Nonelectrolytes", Third Edition, pgs. 425 et seq.
However, simplified procedure, sufficiently accurate :.. -1153;~74 for qualification of a useful TFSA composition may be utilized. Components of a give solubility parameter are generally insoluble in hydrocarbon (non-hydrogen-bonding) solvents having a lower solubility parameter - 8a -: , llS32~4 l than thcmselves. :Cherefore, the present composition should be~oluble in a hydrocarbon solvent of a solu-~t, ?4 -bility parameter of about 6.8. Since the solubility parameter o.f mixtures of solvents is an additive`func-tion of volume percenta~e of components in the mixture, test solutions of the desired solubility parameters may be easlly prepared by blending, for example, benzene (S.P. 9.15~ and isooctane (S.P. 6.8S) or perfluor~-n-heptbne (S.P. 5.7).
10~ A mixture~of about 72~parts of benzene with about 28.parts~o~f~isooc~ane will~provide~a solvent having a ; solubil~ity~par~a~eter~of about 8.5~at~room temperature (abQùt~25C~ Per~luoro n-heptane~11as~ a~so~lub:Llity :
pQrameter~of~about~5.7~at~25C, so~a mixture~o:f 68 ~ :
5~ p~art~s:~of~th~is ~solvent with 32 parts of benzene pr~ovides ` a~solvent~with~a;~sol~ lity~parQme~ter.o~about~6.8,~o :~ ;
isooc ~e f: ~s~ paramete~ 85~ma`~be~used.: ~:
When.~5~ `o~ the:~TF ~`~are~mix~éd wi~th~95:ml ~ an ~ :
, u~l~b~ y~parametQr solvent at roo te~pe,ratur~, a f~ mixsd~wi:~h a~6.85~s~ol:u~ility parameter sol~ent,;a ;c:lou~.~mix:~ure:~or~one s~owing phase~:separation:shoul~:
r~s ~ ` ~ n~mixt es;have a s~ illty par ~eter r~ th~r tes ~ ~ ~ ~ e~`:?re~gnized~thàt~the TFSA~consists n :t ~f~ ~ mà~e~ ` r~co ` ?but~a,cogen ~lc y:r~ ~ s~c`ontainin~ a~r ~ e of:products of r`~we ~ s di~s~trlbuted-around~the:average~
ole ~ ar~ e:~i ~ t`and~ ~en;containin~:small amounts of i~$ ~
,'~:,: : ;

llS3Z74 , 1 ~he s~r~in~ colnl~>llotls elnl~loy~ e syntllesis. ~s a rcs~lt, in l~lnning solubility .~nd ~so~ub;lity parameter tests, very slight ~ppearances of clo~diness or lack of absolute'clarity should not be interpreted as a pass or a failure to pass the criteria. The intent of the test is to ensure that the bulk of the cogeneric mixture, i.e., 75% or more, meets the requirement. When the result is in doubt, ~he solubility tcsts may he run in ~ cen~rifuge tubes allowing subsequent rapid phase separà-~ tion by centrifuging, after whicb ~he'scp.~rated non-solvent phase'can be removed, any solv~ent contained in . it can be evaporated, and the actual weight or volume ~::: . . . ..
'' of sep'arated p~iase can be'determined. ~' 3. The TFSA'should spr~ead at the interface betwe'en dist-illed water and refLned mineral oil to form films with;';thi~cknes~s~no~p,~eater~than about;ZO Angstroms-(O.OOZO~mi~crometer)~ at~a film pressure o~ about 16 dynes~per~cm~(O,~016 Ne'w~ton per ~eter). ~ ~
Suitàble~methods~of~determining;f~ilm pressure are disclo~sèd'~in~N. K.~Adamj '`Physics and Chemistry of Surfacesl'l Third Edition,' Oxor~ University Press, London~
1941~ pg's~. 20;et seq, and~C. M. Blair, Jr., "Inter-fa~ial~Films~Aff'eoting The Stability~o~ Petroleum ETnulsions"~,'Chemis~try~and Tndu'stry (London3, 1960, pgs.
5~38 ~''s~eq~ Film~thicknes~s~is~calculated on-the assumption~hat'~all of the TFSA remains on the area of inter~aoe~between;;oil~and~`water~on~which the product or its solutionl ~ a;voLst}le~solvent has been placed.
Since~9pre9ding~pressure~is numerically equal to the 3~ Ghange'in~interfaoisl tension resulting from spreading of a~film,~ t~is~oonveniently de~rmined by makin~
`1'' ~: ~ ., . :

:: , ~53274 interfacial tension measurements before and after adding a known amount of TFSA to an interface of known area.
Alternatively/ one may utilize an interfacial film balance of the Langmuir type such as that described by J. H. Brooks and B. A. Pethica, Transactions of the Faraday Society (1964), p. 20 et seq, or other methods which have been qualified for such interfacial spreading pressure determina-tions.
In determining the interfacial spreadingpressure of the TFSA products, I prefer to use as the oil phase a fairly available and reproducible oil such as a clear, refined mineral oil. Such oils are derived from petroleum and have been treated with sulfuric acid and other agents to remove nonhydrocarbon and aromatic constituents.
Typical of such oils is "Nujol", distributed by Plough, Inc. This oil ranges in density from about '0 0.85 to 0.89 and usual}y has a solubility parameter between about 6.9 and about 7.5. Numerous similar oils of greater or smaller density and viscosity are commonly available rom chemical supply houses and pharmacies.
Other essentially aliphatic or naphthenic hydrocarbons of low volatility are equally usable and will yield similar values of spreading pressure.
.~
Suitable hydrocarbon oils appear in commexcial trade as refined "white oils", "textile lubricants", "paraffin oil", and the like. Fre~uently, they may contain very small quantities of alpha-tocopherol (Vitamin E) or similar antioxidants which are 115327~

oil-soluble and do not interfere with the spreading measurements.
While the existence of micelles and of oily or aqueous micellar solutions have been known for some time (see, e.g., "Surface Activity", Moilliet, Collie and Black, D. Van Nostrand & Co., New York (1961) ) and are probably involved in many operations involving detergency where either oily (nonpolar) or earthy (highly polar) soil particles are to be removed, their utility in cooperation with hydrotropic agents for the present o purposes is an unexpected and unpredictable discovery.
In U.S. Patent No. 2,356,205, issued August 22, 1944, to Chas. M. Blair, Jr. & Sears Lehman, Jr., a wide variety of micellar solutions designed to dissolve petroleum oils, bitumen, wax, and other relatively nonpolar compounds are described for purposes of cleaning oil formation faces and for effecting en-hanced recovery of petroleum by solution thereof. At this early date, however, the use of micellar principles was not contemplated for the preparation of solutions of the relatively high molecular weight demulsifiers.
~o However, some of the principles disclosed in the above patent, omitting the main objective therein of dissolving rela-tively large amounts of hydrocarbons, chlorinated hydrocarbons, and the like, are applicable to preparation of the present com-positions.
The four necessary components of the micellar solutions ~` of TFSA are:
1. A micelle-forming amphipathic agent. Such may be anionic, cationic, or nonionic and, if anionic or cationic, may be either in salt form or as the o free acid or free base or mixtures thereof.
2. A hy-drotropic agent~ This is a small to medium mole-cular weight semi-polar compound containing oxygen, llS3274 nitrogen or sulfur and capable of forming hydrogen bonds. It is believed that such agents cooperate in some manner with the amphipathic agent to form clear or opalescent, stable compositions.
3. Water.

4. TFSA, having the properties recited above.
In addition to these components, the micellar solutions may contain, but are not required to contain, salts, hydro-carbons, or small amounts of other inorganic or organic material.
Such constituents may be impurities, solvents, or by-products of syntheses used in forming the hydrotropic agent, or may be additions found useful in forming the composition of this invention. As an example of the latter, small amounts of inorganic salts such as NaCl, Na2SO4, RNO3, CaC12, and the like, are sometimes helpful in promoting homogeneity with a minimum of amphipathic and hydrotropic agents. They may also yield compositions of lower freezing point, a property useful when the composition is employed in cold climates. Similarly, ethylene glycol, methanol, ethanol, acetic acid, or similar organic compounds may be incorporated into the compositions to improve physical properties such as freezing point, viscosity, and den~ity, or to improve stability.
As stated above, the micelle-forming amphipathic agents which may be used in preparing the aqueous solutions herein contemplated may be either cation-active, anion-active, or of the nonelectrolytlc type. Amphipathic agents generally have present at least one radical containing about 10 or more carbon atoms and not more than about 64 carbon atoms per molecule.
This is true of the amphipathic agents employed in the present 30 invention as alcomponent of the vehicle or solvent or dis-persant employed in the present compositions. The hydrophobic portions of these agents may be aliphatic, alicyclic, , r alkylalicyclic, aromatic, arylalkyl, or alkylaromatic. The preferred type of agents are those in which the molecule con-tains a long, uninterrupted carbon chain containing from 10 to 22 carbon atoms in length. Examples of suitable anion-active amph:ipathic agents include the common soaps, as well as mater-ials such as sodium cetyl sulfate, ammonium lauryl sulfonate, ammonium di-isopropyl naphthalene sulfonate, sodium oleyl glyceryl sulfate, mahogany and green sulfonates from petroleum or petroleum fractions or extracts, sodium stearamidoethyl !0 sulfonate, dodecylbenzene sulfonate, dioctyl sodium sulfo-succinate, sodium naphthenate, and the like. Other suitable sulfonates are disclosed and taught in U.S. Patent No. 2,278,171, issued February 17, 1942, to De Groote and Keiser.
Suitable cation-active compounds include cetyl pyridinium chloride, stearamidoethyl pyridinium chloride, trimethyl-hepta-decyl ammonium chloride, dimethyl-pentadecyl sulfonium bromide, octadecylamine acetatet and 2-heptadecyl-3-diethylene diamino-imidazoline diacetate.
Suitable nonelectrolytic amphipathic agents include the '0 oleic acid ester of nonaethylene glycol, the steric acid ester of polyglycerol, oxyethylated alkylphenols, and long chain alcohol ethers of polyethylene glycols.
It i8 0~ course, well known that amphipathic aompoundQ
are readily and commercially available, or can be readily prepared to exhibit the characteristics of more than one of the above mentioned types. 5uch compounds are disclosed in U.S.
Patent No. 2,262,743, dated November 11, 1941, to De Groote, Keiser and Blair. For convenience, in such instance where a surface-active material may show the characteristics of more than one of the above described types, it is understood that it may be classified under either or both types.

The mutual solvent or hydrotropic agents of the solution \, _, A

utilized in the present invention are characterizable as com-pounds of a hydrophobic hydrocarbon residue of comparatively low molecular weight combined with a hydrophilic group of low molecular weight and are free from surface-active properties.
The hydrophobic residue may contain from 2 to 12 carbon atoms and may be alkyl, alicyclic, aromatic, or alkyl substituted alicyclic or aromatic, or may be the hydrocarbon portion of a heterocyclic or hydrocarbon substituted heterocyclic group.
The hydrocarbon residue may have branched or normal chain structure, but no branch may have a length of more than 7 car-bon atoms from the point of attachment to the hydrophilic residue, counting a benzene or cyclohexyl group as being equiv-alent in length to an aliphatic chain of three carbon atoms.
Where the hydrocarbon residue consists of not more than 4 car-bon atoms, structures of the normal primary alkyl type are preferred. Where the residue is made up of more than four carbon atoms, then structures of secondary and tertiary types are also good where the second and third branches may be methyl or ethyl groups.
This hydrophobic hydrocarbon residue is combined either directly or indirectly with a hydrophilic group of one of the following groups:
(a) A hydroxyl group which may be alcoholic, phenolic, or carboxylic;
(b) An aldehyde group;
(c) A carboxy amide group;
(d) An amine salt group;
(e) An amine group; and (f) An alkali phenolate group.
By "indirectedly combined with one of these groups" is meant that the hydrocarbon residue is combined as by etherifi-cation, esterification, or amidification, or the like, with %

another organic residue which contains not more than four carbon atoms and also one or more of the hydrophilic groups named above, provided that after said combination, at least one of the hydrophile groups remains free. Specific examples illustrating this class of compounds are: Ethyl alcohol, n-amyl alcohol, alphaterpineol, p-cresol, cyclohexanol, n-butyr-aldehyde, benzaldehyde, n-butyric acid, glycol mono-butyrate, propyl lactate, mono n-butyl amine hydrochloride, n-propionamid, ethylene glycol mono n-butyl amine hydrochloride, n-propionamid, ethylene glycol mono n-butyl ether, pyridine, methylated pyri-dine, piperidine, or methylated piperidines.
The solubilizer (mutual solvent or hydrotropic compound above described) is essentially a semi-polar liquid in the sense that any liquid whose polar character is no greater than that of ethyl alcohol and which shows at least some tendency to dissolve in water, or have water dissolved in it, is properly designated as semi-polar.
The solubilizer ox semi-polar liquid indicated may be illustrated by the formula X -Z, in which X is a radical hav-ing 2 to 12 carbon atoms, and which may be alkyl, alicyclic,aromatic, alkylalicyclic, alkylaryl, arylalkyl, or alicyclic-alkyl in nature, and may, ~urthermore, include heterocyclic compounds and substituted heterocyclic compounds. There is the added limitation that the longest carbon atom chain must be less than eight carbon atoms, and that, in such characteriza-tion, cyclic carbon atoms must be counted as one-half. Z
represents:
U / H O / U
OH;- N \ ; - C ~ ; - CN ; - COOH; or - OMe ~iS3274 where U and V are hydrogen or a hydrocarbon s~bstituent and Me is an alkalie metal;
~ ' N

if X is a cyclic tertiary amine nucleus;

- 16a -~153274 NH

if X is a cyclic secondary amine nucleus.
The semi-polar liquid also may be indicated by the following formula: - X - Y - R - (Z)n Here X and Z have their previous significance, R is - CH2 - , - C2H4 - , - C3H5- ;
- C3H6- or C2H4 C2 4 and n is either one or two as the choice of R demands. Y is one of the following:
o H H 0 o 0 Il I I 11 11 11 - C- N ~ C -; - C- 0 -; - 0 -C -; - 0-; -S - .
In general, these hydrotropic agents are liquids having dielectric constant values between about 6 and about 26, and have at least one polar group containing one or more atoms of oxygen and/or nitrogen. It is significant, perhaps, that all of the solubilizers are of types known to be able to form hydrogen bonds.
The choice of solubilizer or common solvent and its pro-portion in the mixture depends somewhat upon the amphipathic agent used, the amount and kind of TFSA used, and the propor-tion of water used, and is best determined by preparing ex-perimental mixtures on a small ~cale.
In some cases, it is desirable to include in the solution small amounts of acid, alkali, or inorganic salts, as it has been found that the presence of these electrolytes often gives ; solutions having greater stability and a wider range of mis-cibility with water and organic material. Excess acid, when used, will usually be in solutions containing a cation-active or nonelectrolytic wetting agent, but not exclusively so.
Excess alkali, when used, will usually be in a solution contain-ing anion-active wetting agents, but, again, not exclusively.

.

The polyether polyol or TFSA utilized in this invention is genexally an organic polymer or semi-polymer with an average molecular weight above about 800 and below about 30,000 and has a structure which will allow orientation on polar surfaces with much or most of the elements of the molecule in a thin plane. To be effectively adsorbed at oil-water or oil-rock interfaces and subsequently to be desorbed at water-rock inter-faces, the TFSA must generally contain constituents which give it a highly distributed hydrophile and hydrophobe character, and without such concentrations of either hydrophilic or hydro-phobic groups as to produce water solubility or oil solubility, in the ordinary macroscopic sense. The TFSA also appears to differ from formly used surfactants in that the effects on oil-water interfacial tensions as a function of concentration-are limited. While spreading efficiently at such interfaces to form thin films with spreading pressures up to about 35 to 40 dynes per cm, addition or larger amounts of TFSA have relatively little effect on interfacial tension. Also, the present TFSA constituent o~ the micellar solution in contrast to formerly used surfactants, has relatively little or no tendency to stabilize either oil-in-water or water-in-oil emulsions when present in normal use amounts.
Usually the TFSA constituents applicable to the practice of the invention are organic molecules containing carbon, hydrogen and oxygen, although in s~me instances they may also contain sulfur, nitrogen, silicon, chlorine, phosphorous or other elements. Small amounts of inorganic material such as alkalies, acids, or salts may appear in the compositions as neutralizing agents, catalyst residues or otherwise. The critical requirements for the TFSA compositions are not so much compositional as structural and physical. They must be made up of hydrophilic (polar) moieties, usually onescapable of forming 1~53274 hydrogen bonds, such as hydroxyl, carbonyl, ester, ether, sulfonium, amino, ammonium, phospho or similar hydrogen bonding groups, connected by or to hydrophobic groups, such as alkyl-ene, alkyl, cycloalkyl, aryl, arylene, aralkyl, polyalkylene, polyalkylyne, combinations of such groups and such groups containing relatively non-polar substituents, such as hydro-carbon, chlorine, fluorine and the like. Sometimes the hydro-phobic moieties are larger and contain more atoms than the polar groups in the molecule, having a minimum of two carbon atoms in each group and up to as many as 36 carbon atoms, although the actual ratio of sizes depends greatly on the structure of the hydrophilic moiety. Most commonly, the hydro-phobic groups will contain 14 to 22 carbon atoms and will have linear or sheet-like conformations allowing for relatively flat orientation on surfaces.
Polar moieties other than hydrogen bonding ones are not excluded from these compositions and, indeed, may be deliberate-ly included in some structures to improve adsorption and inter-facial spreading tendencies. For example, quaternary ammonium groups, while incapable of foxming hydrogen bonds, can improve spreading and interfacial adsorption in some applications by way of their highly ionized form whlch imparts cationic charac-ter to the molecules in which they occur and, via coulombic repulsion effects, can improve spreading in a film.
Generally, the TFSA constituents will contain at least two each of the required hydrophilic (polar) and hydrophobic moieties per molecule and commonly will contain many more of each. The effective products, however, must have the three properties described above.
While, as pointed out above, the effective TFSA may be derived from a wide variety of chemical reactants and may con-tain numerous different groups or moieties, I have found that llS327g particularly effective products are those which are described as a polyether polyol having the formula:
[O~A)jH~

{NR ~(A)kHl} m wherein:
A is an alkylene oxide group, -CiH2iO-;
O is oxygen;
i is a positive integer no greater than about 10;
j is a positive integex no greater than about 100;
k is a positive integer no greater than about 100;
N is nitrogen;
Rl is one of hydrogen, a monovalent hydrocarbon group contain-ing less than about Cll, or l~ H~; .
L is a positive integer no greater than about 100;
; R is a hydrocarbon moiety of a polyol, a primary or secondary amine, a primary or secondary polyamine, a primary or secondary amino alcohol, or hydrogen; and m + n is no ~reater than about 4 when R is other than hydrogen and one of m and n is zero and the other is unity when R
is hydrogen, said polyether polyol at about 25C: (a) being less than about 1% by volume soluble in water and in isooctane; (b) having a ~olubility parameter in the range of between about 6.9 and about `: 8.5; and (c) spreading at the interface between distilled : water and refined mineral oil to form a film having a thick-ness no greater than about 20 Angstroms at a film pressure of about }6 dynes per cm.
AlternateIy, the TFSA constituents may be described as polyether polyols derivable by the reaction of an alkylene oxide containing less than about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and ~; ~

: `

amino alcohols containing fro~ between about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides.
Compositions incorporated within the scope of the formula set forth above contain an average of about l~ or more hydroxyl groups per molecule and are generally composed of a cogeneric mixture of products obtained by condensing alkylene oxides with smaller molecules containing two or more reactive hydrogens as part of hydroxyl or amino groups.
Representative of these compositions is polypropylene glycol, having an average molecular weight of about 1,200, to which about 20~ by weight of ethylene oxide has been added.
Such a polyether glycol is theoretically obtainable by condens-ing about 20 moles of propylene oxide with about one mole of water, followed by addition of about six moles of ethylene oxide. Alternatively, one may condense about 20 moles of popylene oxide with a previously prepared polyethylene glycol of about 240 average molecular weight.
Alkylene oxides suitable for use in preparing the TFSA
constituents used in the present solutions include ethylene oxide, propylene oxide, butylene oxide, 2-3-epoxy-2-methyl hutane, trimethylene oxide, tetrahydrofuran, glycidol, and similar oxides containing less than about 10 carbon atoms.
Because of their reactivity and relatively low cost, the pre-ferred alkylene oxides for preparing effective TFSA constitu-ents are the 1,2-alkylene oxides (oxiranes) exempliied by ethylene oxide, propylene oxide and butylene oxide. In the preparation of many TFSA constituents, more than one alkylene oxide may he employed either as mixtures o oxides or sequen-tially to form block additions of individual alkylene oxide groups.
Other suitables dihydric alcohols may be obtained by condensing alkylene oxides or mixtures of oxides or in ~lS3Z74 successive steps (blocks) with difunctional (with respect to oxide addition) compounds, such as ethylene glycol, methyl amine, propylene glycol, hexamethylene glycol, ethyl ethanol-amine, analine, resorcinol, hydroquinone and the like.
Trihydric ether alcohols may be prepared by condensation of ethylene, propylene or butylene oxides with, for example, glycerin, ammonia, triethanolamine, diethanolamine, ethyl ethylene diamine or similar smaller molecules containing three hydrogens capable o~ reacting with alkylene oxides. Similarly, polyether alcohols with a multiplicity of hydroxyl groups may be obtained by condensing alkylene oxides with multireactive starting compounds, such as pentaerythritol, glycerol, N-mono-butyl ethylene diamine, trishydroxymethylaminomethane, ethylene diamine, diethylenetriamine, diglycerol, hexamethylene diamine, decylamine and cyclohexylamine. DeGroote, in U.S. Patent No. 2,679,511, describes a number of amino derived polyols which he subsequently esterifies Product 15-200, manufactured and sold by the Dow Chemical Company, and derived by oxyalkyla-tion of glycerol with a mixture of ethylene and propylene oxides, is an example of a commercially available polyol of the kind contemplated herein.
Generally, these composltions will have average molecular weights of 15,000 or less and will be derived from reactive hydrogen compounds having 18 or fewer carbon atoms and 10 or fewer reactive hydrogens.
Other general descriptions of suitable compounds coming within the scope of the structure detailed above, along with ~ methods for carrying out the actual manufacturing steps, are : disclosed in "High Polymers, Vol. XIII, Polyethers," edited by N. G. Gaylord, John Wiley ~ Sons, New~York, 1963.
As to the limits o~ the various constituents of the micellar solutions containing TFSA, the following will serve 1~53274 as a guide, the percentages being by weight:
Percent TFSA Constituents about 5 to about 75 ~ydrotropic Agent about 2 to about 30 Amphipathic Agent about 2 to about 30 Water about 15 to about 90 Although the exact function of the electrolytes previous- -ly referred to is not completely understood, the effect, in part, may be due to the ability to bind water, i.e., to become hydrated. This suggests that certain other materials which are highly hydrophile in character and clearly differentiated from the classes of non-polar solvents and semi-polar solu-bilizers may be the functional equivalent of an electrolyte. ~ -Substances of this class which ordinarily do not dissociate include glycerol, ethylene glycol, diglycerol, sugar, glucose, sorbitol, mannitol, and the like.
Also, as stated above, these solutions may contain other organic constituents such as hydrocarbons. These frequently are used as thinning agents, azetropic distillation aids or reflux temperature controllers in the manufacture of the TFSA
constituent and may be left therein when the present micellar solutions are prepared. To the extent that such compounds are present they appear to compete somewhat with the ~FSA
constituent for micelle space, thus limiting, to some extent, the maximum amount of TFSA constituent which can be brought into homogeneous solutlon.
Selection of an efective TFSA composition for a given petroleum emulsion and determination of the amount required is usually made by so-called "bottle tests", conducted, in a typical situation, as follows:

A sample of fresh emulsion is obtained and 100 ml por-tions are poured into each of several 180 ml screw top . .. i . . . .

115;~274 prescription or similar graduated bottles, Dilute solutions(1% or 2%) of various TFSA constituents are prepared in iso-propyl alcohol. By means of a graduated pipette, a small volume of a TFSA solution is added to a bottle. A similar volume of each composition is added to other bottles contain-ing emulsion. The bottles are then closed and transferred to a water bath held at the same temperature as that employed in the field treating plant. After reaching this temperature, the bottles are shaken briskly for several minutes.
After the shaking period, the bottles are placed upright in the water bath and allowed to stand quietly. Periodically, the volume of the separated water layer is recorded along with observations on the sharpness of the oil-water interface, appearance of the oil and clarity of the water phase.
After the standing period, which may range from 30 min-utes to several hours, depending upon the temperature, the viscosity of the emulsion and the amount of TFSA compositions used, small samples of the oil are removed by pipette or ; syringe and centrifuged to determine the amount of free and emulsified water left in the oil. The pipette or syringe used to remove the test samples should be fitted through a stopper or other device which acts as a position guide to insure that all bottles are sampled at the same fluid level.
The combined information on residual water and emulsion, speed of the water separation and interface appearance provides the basis for selection of the generally most effective TFSA
constituent. Where none of the results are satisfactory, the tests should be repeated using higher concentrations of TFSA
constituents and, conversely, where all results are good and similar, the tests should be repeated at lower concentrations until good discrimination is possible.
In practicing the process for resolving petroleum `

emulsions o~ the water-in-oil type with the present micellar solution, such solution is brought into contact with or caused to ~ct upon the emulsion to be treated, in any of the various methods or apparatus now generally used to resolve or break petroleum emulsions with a chemical reagent, the above pro-cedure being used alone or in combination with other demulsi-fying procedure, such as the electrical dehydration process.
One type of procedure is to accumulate a volume of emul-sified oil in a tank and conduct a batch treatment type of demulsification procedure to recover clean oil. In this pro-cedure, the emulsion is admixed with the micellar TFSA solu-tion, for example, by agitating the tank of emulsion and slow-ly dripping the micellar TFSA solution into the emulsion. In some cases, mixing is achieved by heating tha emulsion while dripping in the micellar TFSA solution, depending upon the convection currents in the emulsion to produce satisfactory admixture. In a third modification of this type of treatment, a circulating pump withdraws emulsion from, e.g., the bottom of the tank and reintroduces it into the top of the tank, the micellar TFSA solution being added, for example, at the suction side of said circulating pump.
In a second type of treating procedure, the micellar TFSA
solution i8 introduced into the well fluids at the wellhead, or at some point between the wellhead and the final oil storage tank, by means of an adjustable proportioning mechanism or proportioning pump. Ordinarily, the flow of fluids through the subsequent lines and fittings-sufficas to produce the desired dagree of mixing of micellar TFSA solution and emulsion, although, in some instances, additional mixing devices may be introduced into the flow system. In this general procedure, the system may include various mechanical devices for with-drawing free water, separating entrained water, or accomplishing ~r \~.

~lS327~

quiescent settling of the chemically treated emulsion. Heatingdevices may likewise be incorporated in any of the treating procedures described herein.
A third type of application (down-the-hole) of micellar TFSA solution to emulsion is to introduce the micellar solution either periodically or continuously in diluted form into the well and to allow it to come to the surface with the well fluids, and then to flow the chemical-containing emulsion through any desirable surface e~uipment, such as employed in the other treating procedures. This particular type of application is especially useful when the micellar solution is used in connection with acidification of calcareous oil-bearing strata, especially if dissolved in the acid employed for acidification.
In all cases, it will be apparent from the foregoing description, the broad process consists simply in introducing a relatively small proportion of micellar T~SA solution into a relatively large proportion of emulsion, admixing the chemical and emulsion either through natural flow, or through special apparatus, with or without the application of heat, and allowing the mixture to stand quiescent until the undesirable water content of the emulsion separates and settles from the mass.
Besides their utility for breaking petroleum emulsions, the present micellar TFSA solutions, as mentioned earlier, may be used to prevent emulsion formation in steam flooding, ; in secondary waterflooding, in acidizing of oil-producing formations, and the like.
Petroleum oils, even after demulsification, may contain substantial amounts of inorganic salts, either in solid form or as small remaining brine droplets. For this reason, most petroleum oils are desalted prior to refining. The desalting X

~:lS3274 step is effected by adding and mixing with the oil a few volumepercentages of fresh water to contact the brine and salt. In the absence of demulsifier, such added water would also become emulsified without effecting its washing action. The present micellar solutions may be added to the fresh water to prevent its emulsification and to aid in phase separation and removal of salt by the desalting process. Alternatively, if desired, they may be added to the oil phase as are present aromatic solvent compositions.
Most petroleum oil, along with its accompanying brines and gases, is corrosive to steel and other metallic structures with which it comes in contact. Well tubing, casing, flow lines, separators and lease tanks are often seriously attacked by well fluids, especially where acidic gases such as H2S or C2 are produced with the liquids, but also in systems free of such gases.
It has been known for some time, and as exemplified in - U.S. Patent 2,466,517, issued April 5, 1949, to Chas. M. Blair and Wm. F. Gross, that such corrosive attack of crude oil fluids can be mitigated or prevented by addition to the fluids of small amounts of organic inhibitors. Effective inhibitors compositions for this use are usually semi-polar, surface active compounds containing a nonpolar hydrocarbon moiety attached to one or more polar groups containing nitrogen, oxygen or sulfur or combinations of such elements. Generally these inhibitors or their salts are soluble in oil and/or ~- water (brine) and frequently appear to be able to form micelles in one or both of these phases. Typical inhibitors include amines such as octyl amine, dodecyl amine, dioctodecyl amine, butyl naphthyl amine, dicyclohexyl amine, benzyl dimethyldo-decyl ammonium chloride, hexadecylaminopropyl amine, decycloxy-propyl amine, mixed amines prepared by hydrogenation of nitrile X

llS3274 derivatives of tall oil fatty acids, soya acid esters ~f mono-ethanol amine, 2-undecyl, l-amino ethyl imidazoline and a wide variety of cationic nitrogen compounds of semi-polar charac-ter. Also effective in some applications are nonyl succinic acid, diocylnaphthalene sulfonic acid, trimeric and dimeric fatty acids, propargyl alcohol, mercaptobenzothiozole, 2, 4, 6-trimethyl-1, 3, 5-trithiaane, hexadecyldimethyl benz-imidazolium bromide, 2-thiobutyl-N-tetrodecylpyridinium chlor-ide, tetrahydronaphthylthiomorpholine, and the like.
In contrast to the TFSA, corrosion inhibitors appear to function by forming on the metal surface strongly adherent, thick, closely packed films which prevent or lessen contact of corrosive fluids and gases with the metal and interfere with ionic and electron transfer reactions involved in the corrosion process.
Corrosion inhibitors are quite commonly introduced down the casing annulus of oil wells where they commingle with the well fluids before their travel up the well tubing and thus can effectively prevent corrosion of well equipment. Where corrosive attack occurs at the surface, the inhibitor may be introduced at or near the well head, allowing it to adsorb on the flow lines and surface equipment to insure protection.
Addition o~ inhibitor at either downhole or surface locations may be combined conveniently with demulsifier addi-tion since the latter is also frequently introduced in one of these locations.
Inhibitors such as those mentioned above, may generally be incorporated into the TFSA micellar solutions, replacing a portion of or in addition to the TFSA constituent. Also, since many of these inhibitors are themselves micelle-forming amphi-pathic agents, they may be included in the micellar solution as such, replacing other amphipathic agents which might be llS3~74 otherwise utilized. Combining the micellar solution with corrosion inhibitor permits more economic chemical treatment by reducing inventory to one compound, requiring only one chemical injection system rather than two and lessening the labor and supervision required.
Still another important effect of using the micellar solution of TFSA and corrosion inhibitor results from the prevention of emulsification by the lnhibitor. Frequently, it has been found that inhibitor in the amount required for effective protection causes the formation of very refractive emulsions of water and hydrocarbon, especially in systems containing light, normally nonemulsifying hydrocarbons such as distillate, casing head gasoline, kerosene, diesel fuel and various refinery fractions. Inhibitors are commonly used in refinery systems where emulsification is highly objectionable and where the compositions could be designed to include an effective emulsion preventative micellar solution of TFSA.
Inhibitor use may range from a few to several hundred parts per million based on the oil to be treated, depending upon the severity of corrosion. For a given oil field or group of wells, tests will normally be run to determine the requirement for micellar solution of TFSA and for inhibitor and a composition incorporating these components in approxi-mately the deslred ratio will be prepared. In some instances, the requirement for micellar solution of TFSA in the best -~ concentration may result in use of corrosion inhibitor, employed as micelle-formerl in some excess over that required for inhibition. This will not affect the utility of the micellar solution and will provide a comfortable excess of inhibition which can be helpul during the periods when higher corrosivity may be encountered.

Examples of micellar solutions employing TFSA with inhibitor in water dispersible, micellar solutions are given below.
Selection of the proper corrosion inhibitor for a given system or oil is usually made by conducting laboratory tests under conditions simulating those encountered in the well or flowline. Such tests are exemplified by that described in Item No. lK155, "Proposed Standardized Laboratory Procedure for Screening Corrosion Inhibitors for Oil and Gas Wells", published by the National Association of Corrosion Engineers, Houston, Texas.

EXAMPLES OF THIN FILM SPREADING AGENTS

EXAMPLE I
To an autoclave equipped with a means of mechanical stirring, heating, and cooling, 4.7 parts of dipropylene glycol and 0.25 parts potassium hydroxide were added. The contents of the autoclave were heated to 125C. At this temperature, 1,2-propylene oxide was slowly introduced from a transfer bomb which contained 200 parts of 1,2-propylene oxide. Cooling was applied during the addition to maintain the temperature below 130C with a pressure of 60 - 75 psi.
Approximately two hours were required to introduce the 1,2-propylene oxide. The reaction mass was maintained at 130C
for four hours to ensure that the unreacted 1,2-propylene oxide was at a minimum. Five parts of ethylene oxide were then added from a transfer bomb at such a rate that the ` temperature was maintained between 150 - 160C with a pressure of 60 - 75 psi. After all of the ethylene oxide had been added, the temperature was held at 150C for an additional hour to complete the reaction. The molecular wei~ht of the final product was approximately 4,000.

This product is insoluble in water and diisobutylene, has a Solubility Parameter of 7.2 and spreads at the distilled water-mineral oil interface to yield a spreading pressure of 21 dynes per cm at a calculated thickness of 10 Angstroms.

EXAMPLE II
In an apparatus similar to that of Example I, 9.2 parts of glycerol were reacted with 275 parts of a mixture of 225 propylene ~ 30a -~lS3Z7~
oxide and 50 parts of ~thylene oxide, uslng the same procedure as t:hat employed in Example II of my co-pending application filed on June 3, 1980, having Serial number 353,232, entitled "Method of Recovering Petroleum From A Subterranean Reservoir Incorporating Resinous Polyalkylene Oxide Adducts 11 . The final product was a clear, almost colorless viscous oil having a molecular weight of about 3,000. This product was not soluble to the extent of 1% in water or diisobutylene. It has a solubility parameter of 7.5 and spread at the distilled water-mineral oil in~erface to yield a pressure of 20 dynes per cm with a calculated film thickness of 12 Angstroms.

EXAMPLE III
: Using the apparatus and procedure of Example I, 4,000 lbs. of polypropylene glycol of average molecular weight 1,200 was condensed with 700 lbs. of ethylene oxide. Forty pounds of potassium hydro-ide was dissolved in the polypropylene glycol prior to oxide addi-tion, which was carried out within the temperature range of about , 140 - 160C under a maximum pressure of about 75 psi.
: This product, on cooling to room temperature, was found.to be insoluble to the extent of 1% in water and isooctane, to have a solubility parameter of 8.0 and to spread at a whi~e oil-distilled water interface at 25C to form a ~ilm exerting a spreading ~'. pressure of 16 dynes per cm with a calculated film thickness of 20 Angstroms.

. EXAMPLE IV
To a 200 gal. vesseI equipped like the larger one of Example I, was placed 175 lbs. of diethylene triamine. The temperature was raised to 110C and propylene oxide was slowly admitted at a 13L532~

rate sufficient to raise the temperature by way of the heat of reaction to about 140C. Cooling was then applied to maintain this temperature until 700 lbs. of propylene oxide had been added. At this point the contents of the vessel were cooled to 70C and pumped into a 2,000 gal. stainless steel vessel similar to that of Example I.
Nine pounds of flake caustic potash was stirred into the vessel contents. Pure nitrogen was blown through the liquid contents to remove water and the temperature was raised to 110C. The vessel was then closed, the nitrogen valve was closed and propylene oxide was again pumped into the reaction mass at a rate sufficient to bring the temperature to about 140 - 160C. Such addition was continued until the rate of oxide addition fell to two lbs. per minute. The vessel was then opened briefly and an additional 25 lbs. of flake caustic potash was introduced followed by 30 minutes of nitrogen spraging.
Propylene oxide was again pumped into the reaction mass until the total of all propylene oxide additions came to 8,000 lbs. At this point the propylene oxide addition was stopped and ethylene oxide was introduced at a rate sufficient to maintain a liquid temperature of about 140 - 150C or until a total of 900 lbs. had been added.
The cooling system was then activated to reduce the temperature to about 40 C at which point the product was pumped to storage.
This product met the three criteria for a suitable TFSA
recited above.

EXAMPLE V
Two Hundred pounds of triethanolamine were substituted for the diethylene triamine of Example IV. The synthesis 1153~74 procedure was followed except that the 9 lbs. of flake caustic potash was stirred into the triethanolamine prior to the addition of propylene oxide.
The final product met the required criteria for the TFSA.

EXAMPLES OF MICELLAR SOLUTIONS OF TFSA's EXAMPLE A
Wt. %
Product of Example III 40 2-heptadecyl-3-triethylene triaminoimidazoline 6 o Acetic Acid 1.5 Phenol 2.5 n-Butanol 10 Water 40 Besides having good demulsification action, this product has been found to be an effective corrosion inhibitor for down-the-hole use, the imidazoline used as the amphipathic agent being a strongly adsorbed inhibitor for steel in anaero-bic systems.

EX~MPLE B
Wt.
Product of Example I 40 Sodium Mahogany Sulfonate (M. W. of about 470) 15 Methanol 5 Alpha Terpineol 10 Water 30 This product has substantial corrosion inhibiting actionin aerated systems as well as being a useful demulsifier.
This product was tested to determine its effective in enhancing `

1~53274 the recovery of oil by waterflooding.
Among procedures which have been found useful in select-ing effective micellar TFSA solutions for this use, one involves a determination of oil displacement efficiency from prepared oil-containing rock cores in equipment described below. A tube of glass or transparent polymethacrylate ester, having an inside diameter of about 3.5 cm (1~ in.) and a length of about 45 cm (18 in.), is fitted with inlet connec--tions and appropriate valves at each end. The tube is mounted vertically on a rack in an air bath equipped with a fan, heat-er and thermostat which allows selection and maintenance of temperatures in the range of between about 25 - 130C.
To select an effective micellar TFSA solution for use in a given oil formation, samples of the oil, of the producing rock formation and of the water to be used in the flooding operation were obtained. The formation rock is extracted with tolu~ne to remove oil, is dried and is then ground in a ball mill to the point where a large percentage passes a 40 mesh sieve. The fraction between 60 and 100 mesh in size is retained. The tube described above is removed from the air bath, opened and, after insertion of a glass wool retainer at the lower end, is packed with the ground formation rock. The tube i9 tapped gently from time-to-time during filling toensure close packing and is visually inspected to assure absence of voids.
The tube is then returned to the air bath, connected to the ~nlet tubing, the temperature is adjusted to the oil formation temperature and water representative of that produc-ed from the formation is admitted slowly through the bottom line from a calibrated reservoir in an amount just sufficient to fill the packed rock plug in the tube. This volume is determined from the calibrations and is referred to as the ~ ~ .

llS3Z7~

"pore volume", being that volume of water just sufficient tofill the pores or interstices of the packed plug rock.
The upper line to the reservoir is then connected to a calibrated reservoir containing the oil representing that from the formation to be flooded. By proper manipulation of valves, the line is filled with oil which is then slowly pumped into the core from the reservoir after the lower valve is opened to allow displacement of the formation water.
As breakthrough of oil at the bottom is noted, pumping is stopped and the volume of oil introduced into the sand is determined from the reservoir readings. This is referred to as the volume of oil in place. The tube of sand containing oil is then left in the air bath at the temperature of the formation for a period of three days to allow establishment of equilibrium between the ground formation rock and the oil with respect to adsorption of oil constituents on the rock and lowering of interfacial tension. The time allowed for equilibrium may be varied widely. At higher temperatures, the time required to reach equilibrium is probably reduced.
Usually, for comparative tests, three days are allowed to age the oil-rock plug. Results with this procedure closely simu-late work with actual cores of oil-bearing rock.
The oil and water samples used for test purposes are preferably taken under an inert gas such as high purity nitro-gen, and are maintained out of contact with air during all miniuplations in order to prevent oxidation of the oil and concomitant introduction of spurious polar, surface-active constitutents in the oil. At this point, the rock-oil system simulates the original oil formation before primary production oil has commenced and well before any secondary waterflood operation.
The upper inlet line to the tube is now connected to the - 35 - .

q~ r ~lS3274 sample of water used in the flooding of the oil formation and, by means of a syringe pump or similar very small volume posi-tive displacement pump, the water is pumped into the sand body from the top to displace fluids out of the bottom tubing connection into a calibrated receiver. The pumping rate is adjusted to one simulating the rate of flood water advance in an actual operation, which is usually in a range of 1 to 50 cm per day. Pumping is maintained at this rate until two pore volumes of water have been pumped through the sand.
The volumes of fluids collected in the receiver are measured and the relative amount of oil and water displaced from the rock sample are determined and recorded. Of special interest is the volume of oil displaced as a fraction of the original pore volume. This information may be viewed as an indication of the approximate percentage of oil originally in place which is produced by natural water drive following drilling of a well into the rock formation followed by the primary phase of field production carried to the approximate economic limit.
Following this step, one to three additional pore vol-umes of water containing the TFSA micellar solution to be tested are pumped slowly through the plug and the volume3 o~
additional oil and water displaced are determined. Typically, where such an initial "slug" of micellar TFSA solution is introduced, it may be contained in a volume of fluid ranging from 1% to 100% of the pore volume, but most frequently it will be in a slug volume of 10% to 50% of pore volume.
After this final displacement step, the produced oil and water are again measured. By comparing the amount of oil produced by this additional injection of water containing, or preceded by a solution, of micellar TFSA solution with the amount produced when the same volume of water containing no .~

llS;~Z74 TF~A solution is injected, one can evaluate the effectiveness of the particular micellar TFSA solution used for enhancing the recovery of additional oil over and above that obtained by ordinary waterflooding. Generally, six or more sand columns of the kind described above are mounted in the heated air bath. Test of a given micellar TFSA solution is then run in triplicate, using identical conditions and concentrations, simultaneously with three blank tests run similarly but without addition of micellar TFSA solution to the water.

The composition of Example ~ was tested by this procedure with the following conditions;

Oil --Ranger Zone, Wilmington, Calif., field API Gravity approximately 13.5 Water --Mixed water used in flood opera-tions Airbath Temperature --150F (Same as formation tempera-ture) Oil was displaced by pumping two pore volumes of water into the sand. After measuring the volumes of oil and water produced through the bottom line, a further 0.2 pore volumes of water containing 3,500 ppm of the composition of Example B
was injected followed by 2.8 volumes o water containing 200 ppm of the composition of Example ~ Measurement of the volumes of oil and water produced were read after each 0.2 ; pore volumes of water was injected.
Results of this test at the points of 2,3 and 5 pore volumes of injected water are given in the table below wherein averages of three duplicate determinations are presented.

~ .

Oil Recovery as % of Oil in Place Composition of Ration of Incre-Example B ment of Oil Added to Production After Pore Volumes Water after Initial 2 (P.V.) of No Chemical Initial 2 P.V. P.V. Chemical/
Water Injected Addition of Water No Chemical 2 36.5 36.5 3 40.0 44.5 2.3 43.1 54.8 2.8 Use of the composition of Example B in the amounts given above resulted in the production of 130% more oil from injec-tion of one incremental pore volume of water than was produced by water injection alone and gave 180% more oil after three incremental pore volumes of treated water injection.

EXAMPLE C
Wt.
Product of Example III 70 Oleyl amine 10 Acetic Acid 3 n-Propanol 2 Water 15 This is a clear, homogeneous but viscous solution. This product was found to be an effective demulsifier for emulsion produced in the Swan Hills, Alberta, field and was especially ~, helpful in causing a clear water phase to separate from the oil phase in the field treating plant.
;

- 3~ -EXAMPLE D
Wt.
Product of Example IV 27.3 Dodecyldimethylbenzyl Ammonium Chloride 27.3 N-Butanol 9.1 Mixed cresylic acids 13.6 Water 22.7 This product in addition to having strong demulsifica-tion on East Texas crude oil emulsions, is an effective bacteriacide with the quarternary ammonium salt and the cresy-lic acids which are sufficiently soluble in the aqueous phase separating from the emulsion to prevent bacterial growth therein and thus insure its ready injectability for disposal or enhanced recovery. In this composition the dodecyldimethyl-benzyl ammonium chloride functions both as a micelle-forming amphipathic agent and as a biocide. The utility of this product for the breaking and resolution of a petroleum emulsion was demonstrated by the following test:
100 ml of an emulsion from the Taching field, People's Republic of China, was placed into each of two 6 oz. graduated, screw cap bottles. The emulsion contained 42% water as determined by azetropic distillation with xylene. The bottles were placed in a water bath and held at a temperature of 130F.
After 30 minutes in the bath, one bottle (No. 1) was opened and 0.8 ml of a 1% isopropanol solution of the composition of ~i Example D was placed in the bottle by means of a calibrated 1.0 ml pipette. 0.8 ml of pure isopropanol was placed into the other bottle (No. 2) with a similar pipette. Both bottles were closed tightly, shaken in a mechanical shaking machine for five minutes at a rate of 134 four-inch oscillations per minute and then returned to the water bath.

~, .

After one hour of quiet standing at 130F the bottles were examined. In Bottle No. 1 a clear phase separation was apparent with a sharp interface at approximately the 40 ml graduation. Bottle No. 1 showed no free water or other phase separation.
The bottles were allowed to stand for another hour after which they were opened and 6 ml samples were pipetted from the 60 ml of each level and mixed with 6 ml portions of xylene in 12 ml API calibrated centrifuge tubes. The tubes were shaken for a few seconds to insure mixing of oil and xylene and then centrifuged for five minutes at 1800 rpm. The sample from Bottle No. 1 contained 0.2% free water and 0.1% sedimented emulsion. The sample from Bottle No. 2 contained 52% of a sedimented emulsion layer and no free water.

,, - 39a -I Wt. %
Product of Example III 30 Isopropanol 10 Ammonium nonylphenoxyethoxy sulfate 8 "Polyox" *coagulant (PQlyethyleneoxide of Mol. Wt. about 5 million) 2 Water 50 This product was found to be an effective demulsifier for emulsions produced in the Salem, Illinois field and was further found to give a clear separated water phase, free of oil and other suspended matter, which could be reinjected for pressure mainten-ance with minimal contamination of filters and producing formation:
This product has a high viscosity and can be used as such or mixed with an approximate equal quantity of water as the drive fluid for secondary or tertiary oil recovery where mobility con-trol, as well as improved water wetting and oil removal, is an important consideration.
Although the invention has been described in terms of ; ~ specified embodiments which are set forth in detail, it should be :`~
understood that this is by illustration only and that the inven-tion is not necessarily limited thereto, since alternative embodiments and operating techniques will become apparent to those skilled in the art in view of the disclosure. Accordingly, modi-fications are contemplated which can be made without departing ~- 25~ from the spirit of the described invention.
' ~ .
i~
`~ .

$

Claims (70)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A method for breaking petroleum emulsions of the water-in-oil type characterized by subjecting the emulsion to the action of a homogeneous micellar solution of a thin film spreading agent, comprising: (1) from between about 5% and about 75% by weight of a polyether polyol having the formula:

wherein:
A is an alkylene oxide group, - CiH2iO -;
O is oxygen;
i is a positive integer from 2 to about 10;
j is a positive integer no greater than about 100;
k is a positive integer no greater than about 100;
N is nitrogen;
R1 is one of hydrogen, a monovalent hydrocarbon group containing less than about C11, or [ALH];
L is a positive integer no greater than about 100;
R is a hydrocarbon moiety of a polyol, a primary or secondary amine, a primary or secondary polyamine, a primary or secondary amino alcohol, or hydrogen;
and m + n is no greater than about 4 when R is other than hydrogen and one of m and n is zero and the other is unity when R is hydrogen;
said polyether polyol at about 25 C.: (a) being less than about 1% by volume soluble in water and in isooctane; (b) having a solubility parameter in the range of between about 6.9 and about 8.5; and (c) spreading at the interface between distilled water and refined mineral oil to form a film having a thick-ness no greater than about 20 Angstoms at a spreading pressure of about 16 dynes per cm; (2) from between about 2% and about 30% by weight of a hydrotropic agent having one of the formu-las:
X - Z (A) wherein X is an alkyl, alicyclic, aromatic, alkylalicyclic, alkylaryl, arylalkyl, alicyclicalkyl, heterocyclic or sub-stituted heterocyclic radical having 2 to 13 carbon atoms;
and wherein Z is one of: -OH;

; -CHO; - COOH, and - OCH3; and U and V are hydrogen or hydrocarbon substituents;
X - Y - R - (Z)n, (B) wherein:
Z is one of - OH;

; -CHO; ;

- COOH; and - OCH3;
X is an alkyl, alicyclic, aromatic, alkylalicyclic, alkylaryl, arylalkyl,alicyclicalkyl, heterocyclic or substituted heterocyclic radical having 2 to 12 carbon atoms;
R is a member selected from the class consisting of -CH2-,-C2H4-,C3H5=,-C3H6,and -C2-H4-O-C2H4-;

n is either a one or two integer, the integer depend-ent upon the selection of R;

U and V are hydrogen or hydrocarbon substituents;
and Y is a member selected from the class consisting of:

, , , , - O -, and - S - ;
(3) from between about 2% and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; and (4) from between about 15% and about 90% by weight, water.

2. The method of claim 1 wherein said polyether polyol contains an average of at least about 11/2 hydroxyl groups per molecule and is the condensation reaction product of at least one alkylene oxide with a reactant having two or more reactive hydrogens of one or more hydroxyl or amino groups.

3. The method of claim 1 wherein said polyether polyol is an ethylene oxide condensate of polypropylene glycol having an average molecular weight of at least about 800.

4. The method of claim 1 wherein R is the hydro-carbon residue of a dihydric alcohol.

5. The method of claim 1 wherein said polyether polyol is a trihydric ether alcohol.

6. The method of claim 1 wherein the hydrophobic portion of the amphipathic agent is aliphatic, alkylalicy-clic, aromatic, arylalkyl or alkylaromatic.

7. The method of claim 1 wherein the amphipathic agent contains an uninterrupted chain of from between about 10 and about 22 carbons.

8. The method of claim 1 wherein the amphipathic agent is an anion-active soap.

9. The method of claim 1 wherein the amphipathic agent comprises mahogany or green sulfonates of petroleum, petroleum fractions, or petroleum extracts.

10. The method of claim 1 wherein the amphipathic agent is anionic.

11. The method of claim 1 wherein the amphipathic agent is cationic.

12. The method of claim 1 wherein the amphipathic agent is nonionic.

13. A method for breaking petroleum emulsions of the water-in-oil type characterized by subjecting the emulsion to the action of a homogeneous micellar solution of a thin film spreading agent, comprising: (1) from between about 5% and about 75% by weight of a polyether polyol derived from the reaction of an alkylene oxide containing less than about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and amino alcohols containing from about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides, said polyether polyol having an average molecular weight of about 15,000 or less, said member being derived from reactive hydrogen compounds having 18 or less carbon atoms, said polyether polyol at about 25 C.: (A) having a solubility in water and isooctane of less than about 1%, by volume; (B) having a solubility parameter from between about 6. a and about 8.5; and (C) spreading at the interface between white, refined mineral oil and distilled water to form a film having a calculated thickness no greater than about 20 Ang-stroms, at a spreading pressure of about 16 dynes per cm;
(2) from between about 2% and about 30% by weight of a hydro-tropic agent comprising a semi-polar hydrogen bond forming compound containing at least one of oxygen, nitrogen and sulfur and from between about 2 and about 12 carbon atoms;

(3) from between about 2% and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; and (4) from between about 15% and about 90% by weight, water.

14. The method of claim 13 wherein the hydrotropic agent is an alcohol.

15. The method of claim 13 wherein the hydrotropic agent is an hydroxy ester of a polyol.

16. The method of claim 13 wherein the hydrotropic agent is an aldehyde.

17. The method of claim 13 wherein the hydrotropic agent is an amine.

18. The method of claim 13 wherein the hydrotropic agent is a carboxy amide.

19. The method of claim 13 wherein the hydrotropic agent is a phenolate.

20. The method of claim 13 wherein the hydrophobic portion of the amphipathic agent is aliphatic, alkylalicyclic, aromatic, arylalkyl or alkylaromatic.

21. The method of claim 13 wherein the amphipathic agent contains an uninterrupted chain of from between about 10 and about 22 carbons.

22, The method of claim 13 wherein the amphipathic agent comprises mahogany or green sulfonates of petroleum, petroleum fractions, or petroleum extracts.

23. The method of claim 13 wherein the amphipathic agent is anionic.

24. The method of claim 13 wherein the amphipathic agent is cationic.

25. The method of claim 13 wherein the amphipathic agent is nonionic.

26. A method of recovering oil from an oil-bearing formation into which a well bore extends, comprising the steps of: (I) generating steam at the surface; (II) supplying said steam to said oil-bearing formation by way of said well bore;
(III) supplying a homogeneous micellar solution of a thin film spreading agent to said oil-bearing formation to inhibit the production of oil-water emulsion as a result of the interaction of said steam with the oil and water in the formation, said micellar solution comprising: (1) from between about 5% and about 75% by weight of a polyether polyol having the formula:

wherein:
A is an alkylene oxide group, - CiH2iO - ;
O is oxygen;
i is a positive integer from 2 to about 10;
j is a positive integer no greater than about 100;
k is a positive integer no greater than about 100;
N is nitrogen;
R1 is one of hydrogen, a monovalent hydrocarbon group containing less than about C11 or [ALH];
L is a positive integer no greater than about 100;
R is a hydrocarbon moiety of a polyol, a primary or secondary amine, a primary or secondary polyamine, a primary or secondary amino alcohol, or hydrogen;
and m + n is no greater than about 4 when R is other than hydrogen and one of m and n is zero and the other is unity when R is hydrogen, said polyether polyol at about 25°C.: (a) being less than about 1% by volume soluble in water and in isooctane;
(b) having a solubility parameter in the range of between about 6.9 and about 8.5; and (c) spreading at the interface between distilled water and refined mineral oil to form a film having a thickness no greater than about 20 Angstroms at a film pressure of about 16 dynes per cm; (2) from between about 2%
and about 30% by weight of a hydrotropic agent having one of the formulas:
X - Z (A) wherein X is an alkyl, alicyclic, aromatic, alkylalicyclic, alkylaryl, arylalkyl, alicyclicalkyl, heterocyclic or sub-stituted heterocyclic radical having 2 to 13 carbon atoms;
and wherein Z is one of: - OH;

; -CHO; ;

- COOH; and - OCH3; and U and V are hydrogen or hydrocarbon substituents;
X - Y - R - (Z) , (B) wherein;
Z is one of - OH;

;-CHO; ;

- COOH; and - OCH3;
X is an alkyl, alicyclic, aromatic, alkylalicyclic, alkylaryl, arylalkyl, alicyclicalkyl, heterocyclic or substituted heterocyclic radical having 2 to 12 carbon atoms;
R is a member selected from the class consisting of, -CH2-,-C2H4-,C3H5=,C3H6, and -C2-H4-O-C2H4-;

n is either a one or two integer; the integer depend-ent upon the selection of R;
U and V are hydrogen or hydrocarbon substituents;
and Y is a member selected from the class consisting of , , , , - O - , and - S - ;
(3) from between about 2% and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; (4) from between about 15% and about 90% by weight, water; and (IV) recovering from said formation oil and water which was subjected to the action of said steam.

27. The method of claim 26, wherein said polyether polyol contains an average of about 11/2 or more hydroxyl groups per molecule and is the condensation reaction product of at least one alkylene oxide with a reactant having two or more reactive hydrogens of one or more hydroxyl or amino groups.

28. The method of claim 26, wherein said polyether polyol is an ethylene oxide condensate of polypropylene glycol.

29. The method of claim 26, wherein said polyether polyol is a trihydric ether alcohol condensation product of at least one of ethylene, propylene and butylene oxide and a polyol, amine or amino alcohol having present therein hydrogens for reaction with said oxide.

30. The method of claim 26, wherein said polyether polyol is the oxyalkylation reaction product of glycerol and at least one of ethylene and propylene oxide.

31. The method of claim 26, wherein the hydrotropic agent is an amine.

32 The method of claim 26, wherein the amphipathic agent is a hydrophobic hydrocarbon residue-containing composi-tion wherein the hydrocarbon residue is aliphatic, alkylali-cyclic, aromatic, arylalkyl or alkylaromatic.

33. The method of claim 26, wherein the amphipathic agent comprises 2-heptadecyl-3-diethylene diaminoimidazoline diacetate.

34. A method of recovering oil from an oil-bearing formation into which a well bore extends, comprising the steps of: (I) generating steam at the surface; (II) supplying said steam to said oil-bearing formation by way of said well bore; (III) supplying a homogeneous micellar solution of a thin film spreading agent to said oil-bearing formation to inhibit the production of oil-water emulsion as a result of the interaction of said steam with the oil and water in the formation, said micellar solution comprising: (1) from between about 5% and about 75% by weight of a polyether polyol derived from the reaction of an alkylene oxide containing less than about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and amino alcohols containing from about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides, said polyether polyol having an average molecular weight of about 15,000 or less, said member being derived from reactive hydrogen compounds having 18 or less carbon atoms, said polyether polyol at about 25° C.:
(A) having a solubility in water and isooctane of less than about 1% by volume; (B) having a solubility parameter from between about 6.8 and about 8.5; and (C) spreading at the interface between white, refined mineral oil and distilled water to form a film having a calculated thickness no greater than about 20 Angstroms, at a spreading pressure of about 16 dynes per cm; (2) from between about 2% and about 30% by weight of a hydrotropic agent comprising a semi-polar hydrogen bond forming compound containing at least one of oxygen, nitrogen and sulfur and from between about 2 and about 12 carbon atoms; (3) from between about 2% and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule;
and (4) from between about 15% and about 90% by weight, water;
and (IV) recovering from said formation oil and water which was subjected to the action of said steam.

35. A method of breaking petroleum or bitumen emul-sions of water comprising contacting the emulsion with a sufficient emulsion-breaking amount of a homogeneous micellar solution of a thin film spreading agent, said micellar solu-tion comprising: (1) from between about 5% and about 75% by weight of a polyether polyol derived from the reaction of an alkylene oxide containing less than about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and amino alcohols containing from about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides, said polyether polyol having an average molecular weight of about 15,000 or less said member being derived from reactive hydrogen compounds having 18 or less carbon atoms, said poly-ether polyol at about 25°C.: (A) having a solubility in water and isooctane of less than about 1%,by volume; (B) having a solubility parameter from between about 6.8 and about 8.5; and (C) spreading at the interface between white, refined mineral oil and distilled water to form a film having a calculated thickness no greater than about 20 Angstroms, at a spreading pressure of about 16 dynes per cm; (2) from between about 2%
and about 30% by weight of a hydrotropic agent comprising a semi-polar hydrogen bond forming compound containing at least one of oxygen, nitrogen and sulfur and from between about 2 to about 12 carbon atoms; (3) from between about 2% and about 30%
by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; and (4) from between about 15% and about 90% by weight, water.

36. In the method of preventing the formation of emulsions of an aqueous phase and a petroleum oil or bitumen phase, the improvement comprising: contacting at least one of said petroleum, bitumen or water phases with an effective emulsion preventing amount of a homogeneous micellar solution of a thin film spreading agent, said micellar solution of a thin film spreading agent, said micellar solution comprising:
(1) from between about 5% and about 75% by weight of a poly-ether polyol derived from the reaction of an alkylene oxide containing less than about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and amino alcohols containing from about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides, said poly-ether polyol having an average molecular weight of about 15,000 or less, said member being derived from reactive hydrogen compounds having 18 or less carbon atoms, said polyether polyol at about 25°C.: (A) having a solubility in water and isooctane of less than about 1%, by volume; (B) having a solubility parameter from between about 6.8 and about 8.57 and (C) spreading at the interface between white, refined mineral oil and distilled water to form a film having a calculated thickness no greater than about 20 Angstroms, at a spreading pressure of about 16 dynes per cm; (2) from between about 2%
and about 30% by weight of a hydrotropic agent comprising a semi-polar hydrogen bond forming compound containing at least one of oxygen, nitrogen and sulfur and from between about 2 and about 12 carbon atoms; (3) from between about 2% and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; and (4) from between about 15% and about 90% by weight, water.

37, In the method of preventing the formation of emulsions of an aqueous phase and a petroleum oil or bitumen phase, the improvement comprising: contacting said petroleum oil or bitumen phase prior to or coincident with its contact with the aqueous phase with an effective emulsion preventing amount of a homogeneous micellar solution of a thin film spreading agent, said micellar solution com-prising: (1) from between about 5% and about 75% by weight of a polyether polyol derived from the reaction of an alkylene oxide containing from about 2 to about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and amino alcohols containing from about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides, said polyether polyol having an average molecular weight of about 15,000 or less, said member being derived from reactive hydro-gen compounds having 18 or less carbon atoms, said polyether polyol at about 25°C.: (A) having a solubility in water and isooctane of less than about 1%, by volume; (B) having a solubility parameter from between about 6.8 and about 8.51 and (C) spreading at the interface between white, refined mineral oil and distilled water to form a film having a calculated thickness no greater than about 20 Angstroms, at a spreading pressure of about 16 dynes per cm; (2) from between about 2%
and about 30% by weight of a hydrotropic agent comprising a semi-polar hydrogen bond forming compound containing at least one of oxygen, nitrogen and sulfur and from between about 2 and about 1% carbon atoms; (3) from between about 2% and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; and (4) from between about 15% and about 90%
by weight, water.

38. In the method of breaking and preventing emulsions of water in bitumen during the recovery of bitumen from tar sands of subterranean deposits by steaming, flooding or combinations thereof, the improvement comprising: contacting said bitumen with a homogeneous micellar solution of a thin film spreading agent, said micellar solution comprising:
(1) from between about 5% and about 75% by weight of a poly-ether polyol derived from the reaction of an alkylene oxide containing less than about 10 carbon atoms with a member of the group consisting of polyols, amines, polyamines and amino alcohols containing from about 2 to about 10 active hydrogen groups capable of reaction with alkylene oxides, said poly-ether polyol having an average molecular weight of about 15,000 or less, said member being derived from reactive hydro-gen compounds having 18 or less carbon atoms, said polyether polyol at about 25°C.: (A) having a solubility in water and isooctane of less than about 1%, by volume; (B) having a solubility parameter from between about 6.8 and about 8.5;
and (C) spreading at the interface between white, refined mineral oil and distilled water to form a film having a calcu-lated thickness no greater than about 20 Angstroms, at a spreading pressure of about 16 dynes per cm; (2) from between about 2% and about 30% by weight of a hydrotropic agent com-prising a semi-polar hydrogen bond forming compound containing at least one of oxygen, nitrogen and sulfur and from between about 2 and about 12 carbon atoms; (3) from between about 2%
and about 30% by weight of an amphipathic agent having at least one radical having from between about 10 and about 64 carbon atoms per molecule; and (4) from between about 15% and about 90% by weight, water.

39. The method of claim 34, 35, or 36 wherein said polyether polyol contains an average of about 1? or more hydroxyl groups per molecule and is the condensation reaction product of at least one alkylene oxide with a reactant having two or more reactive hydrogens of one or more hydroxyl or amino groups.

40. The method of claim 34, 35, or 36 wherein said poly-ether polyol is an ethylene oxide condensate of polypropylene glycol.

41. The method of claim 34, 35 or 36 wherein said polyether polyol is a condensation product of a dihydric alcohol and at least one alkylene oxide.

42. The method of claim 34, 35, or 36 wherein said polyether polyol is a trihydric ether alcohol.

43. The method of claim 34, 35, or 36 wherein said polyether polyol is a trihydric ether alcohol condensation product of at least one of ethylene, propylene and butylene oxide and a polyol, amine or amino alcohol having present therein hydrogens for reaction with said oxide.

44. The method of claim 34, 35, or 36 wherein said polyether polyol is the oxyalkylation reaction production of glycerol and at least one of ethylene and propylene oxide.

45. The method of claim 34, 35, or 36 wherein the hydrotropic agent is an alcohol.

46. The method of claim 34, 35, or 36 wherein the hydrotropic agent is an hydroxy ester of a polyol.

47. The method of claim 34, 35, or 36 wherein the hydrotropic agent is an aldehyde.

48. The method of claim 34, 35, or 36 wherein the hydrotropic agent is an amine.

49. The method of claim 34, 35, or 36 wherein the hydrotropic agent is a carboxy amide.

50. The method of claim 34, 35, or 36 wherein the hydrotropic agent is a phenolate.

51. The method of claim 34, 35, or 36 wherein the amphipathic agent is a hydrophobic hydrocarbon residue-contain-ing composition wherein the hydrocarbon residue is aliphatic, alkylalicyclic, aromatic, arylalkyl or alkylaromatic.

52. The method of claim 34, 35, or 36 wherein the amphipathic agent is anionic.

53. The method of claim 34, 35, or 36 wherein the amphipathic agent is cationic.

54. The method of claim 34, 35, or 36 wherein the amphipathic agent is nonionic.

55. The method of claim 37 or 38 wherein said poly-ether polyol contains an average of about 1? or more hydroxyl groups per molecule and is the condensation reaction product of at least one alkylene oxide with a reactant having two or more reactive hydrogens of one or more hydroxyl or amino groups.

56. The method of claim 37 or 38 wherein said poly-ether polyol is an ethylene oxide condensate of polypropylene glycol.

57. The method of claim 37 or 38 wherein said poly-ether polyol is a condensation product of a dihydric alcohol and at least one alkylene oxide.

58. The method of claim 37 or 38 wherein said poly-ether polyol is a trihydric ether alcohol.

59. The method of claim 37 or 38 wherein said poly-ether polyol is a trihydric ether alcohol condensation product of at least one of ethylene, propylene and butylene oxide and a polyol, amine or amino alcohol having present therein hydrogens for reaction with said oxide.

60. The method of claim 37 or 38 wherein said poly-ether polyol is the oxyalkylation reaction product of glycerol and at least one of ethylene and propylene oxide.

61. The method of claim 37 or 38 wherein the hydro-tropic agent is an alcohol.

62. The method of claim 37 or 38 wherein the hydro-tropic agent is an hydroxy ester of a polyol.

63. The method of claim 37 or 38 wherein the hydro-tropic agent is an aldehyde.

64. The method of claim 37 or 38 wherein the hydro-tropic agent is an amine.

65. The method of claim 37 or 38 wherein the hydro-tropic agent is a carboxy amide.

66. The method of claim 37 or 38 wherein the hydro-tropic agent is a phenolate.

67. The method of claim 37 or 38 wherein the amphi-pathic agent is a hydrophobic hydrocarbon residue-containing composition wherein the hydrocarbon residue is aliphatic, alkylalicyclic, aromatic, arylalkyl or alkylaromatic.

68. The method of claim 37 or 38 wherein the amphi-pathic agent is anionic.

69. The method of claim 37 or 38 wherein the amphi-pathic agent is cationic.

70. The method of claim 37 or 38 wherein the amphi-pathic agent is nonionic.