Gel of an apolar medium, its use for the preparation of water-based drilling fluids
AssigneeRhone-Poulenc Chimie
InventorsDaniel Aubert, Laurent Frouin, Mikel Morvan, Marie-Madeleine Vincent
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Abstract
The invention relates to a gel made of apolar medium including: an apolar medium, a "multichain" liquid surface-active agent in acidic form, soluble or dispersible in the said apolar medium, an agent for neutralizing the said "multichain" surface-active agent, from 0.2 to 5 molecules of water per molecule of "multichain" surface-active agent, optionally at least one emulsifying agent and/or a solid filler which is soluble or insoluble in the apolar medium. This gel may be employed for the formulation of water-based drilling fluids.
Claims26
A gel of an apolar medium comprising:
- (1) an apolar medium.
- (2)--a multichain liquid surface-active agent in acidic form which is soluble or dispersible in the said apolar medium selected from the group consisting of phosphate diesters of alkoxylated alcohols containing from about 2 to about 20 oxyalkylene units containing from about 2 to about 4 carbon atoms, the alcohol being a C.sub.6 -C.sub.30 linear or branched, saturated or unsaturated aliphatic alcohol, phosphate diesters of alkoxylated alkylphenols containing from about 2 to about 20 oxyalkylene units containing from about 2 to about 4 carbon atoms, the alkylphenol having a C.sub.6 -C.sub.30 all group, and mixtures thereof,
- (3) a neutralizing agent for said multichain surface-active agent, present in a quantity corresponding to about 2 to about 30 times the quantity stoichiometrically necessary for the neutralization of the said multichain surface-active agent, and
- (4) from about 0.2 to about 5 parts by mole of water per mole of multichain liquid surface-active agent, the water being introduced at least partly through the intermediacy of the said multichain surface-active agent or through the intermediacy of said neutralizing agent.
The gel according to 3, wherein component (5) is selected from the group consisting of ethoxylated tristyrylphenols, ethoxylated tristyrylphenol sulfates, propoxylated tristyrylphenol sulfates, ethoxylated tristyrylphenol phosphates, propoxylated tristyrylphenol phosphates, ethoxylated fatty acids, propoxylated fatty acids, ethoxylated alcohols, propoxylated alcohols, ethoxylated/propoxylated block copolymers and sodium dodecylbenzenesulfonate.
A water-based drilling fluid or molded wall composition comprising:
- (1) an apolar medium having the following parameters:
- .delta.P of Keesom interactions lower than 10 (J/cm.sup.3).sup.1/2, .delta.H of hydrogen bonds lower than 10 (J/cm.sup.3).sup.1/2, and .delta.D of London interactions higher than 15 (J/cm.sup.3).sup.1/2 ;
- (2) about 0.5 to about 6.0 parts by weight of a multichain liquid surface-active agent in acidic form which is soluble or dispersible in said apolar medium which are phosphate diesters of alkoxylated alcohols containing from 2 to 20 oxyethylene units, or phosphate diesters of alkoxylated alkylphenols containing from 2 to 20 oxyethylene units;
- (3) a neutralizing agent for said multichain surface-active agent, present in a quantity corresponding to about 2 to about 30 times the quantity stoichiometrically necessary for the neutralization of said multichain surface active agent and which are primary, secondary or tertiary amines or alkanolamines;
- (4) from about 0.2 to about 5 parts by mole of water per mole of multichain liquid surface-active agent;
- and
- about 10 to about 50 parts by weight of one or more hydrocolloids which are polysaccharides, galactomannans, carrageenans, alginates carboxymethyl celluloses, methyl celluloses, hydroxypropyl celluloses, hydroxyethylcelluloses, alkali metal polyacrylates, polyvinyl alcohols, polyethylene glycols or polyvinylpyrrolidones:
- wherein the total weight of said composition is 100 parts.
Dependencies are inferred from the claim text.