A temporary high-temperature-resistant dispersing agent, and a preparation and a use method thereof. The temporary high-temperature-resistant dispersing agent is a block high-molecular polymer prepared by a one-step reaction from polysiloxane containing an amino group. The prepared block high-molecular polymer may be directly used as a dispersant; the block high-molecular polymer may also be used as a basic formula and used as the dispersant after other auxiliary compositions are added; and the block high-molecular polymer may also be used in combination with one or more other dispersion auxiliaries and/or surfactants to meet dispersion requirements in various special occasions.

An oil-phase composition for generating water-in-oil droplets by means of centrifugation, consisting of the following components: 7-15% (v/v) of a long-chain alkyl-containing silicon-oxygen chain nonionic surfactant and 0-10% of mineral oil, with the balance being diethylhexyl carbonate; or consisting of the following components: 85-95% (v/v) of a long-chain alkane ester and 5-15% (v/v) of a long-chain alkyl-containing silicon-oxygen chain nonionic surfactant; or consisting of silicone oil and a surfactant. Also provided is a method for generating water-in-oil droplets by means of centrifugation using the oil-phase composition as a second liquid.

A cationic surfactant is disclosed. The cationic surfactant has the general formula [Z-D-N(-D.sup.1-NR.sup.1.sub.3+).sub.a(R).sub.2-a][X.sup.?].sub.a where Z is a siloxane moiety or an unsubstituted hydrocarbyl moiety having from 5 to 20 carbon atoms, D is a covalent bond or a divalent linking group, D.sup.1 is a divalent linking group, R is H or an unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms, each R.sup.1 is an independently selected unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms, subscript a is 1 or 2, and each X is an anion. A method of preparing the cationic surfactant is also disclosed.

A cationic surfactant is disclosed. The cationic surfactant has the general formula [Z-D-N(-D.sup.1-NR.sup.1.sub.3+).sub.a(R).sub.2-a][X.sup.?].sub.a where Z is a siloxane moiety or an unsubstituted hydrocarbyl moiety having from 5 to 20 carbon atoms, D is a covalent bond or a divalent linking group, D.sup.1 is a divalent linking group, R is H or an unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms, each R.sup.1 is an independently selected unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms, subscript a is 1 or 2, and each X is an anion. A method of preparing the cationic surfactant is also disclosed.

A process for coating a product by ion exchange including: a) providing a product that contains a surface segregating species (SSS) having a low surface energy component and an ionic component wherein the SSS has segregated to an outer surface of the product to form an activated surface; and b) treating the activated surface of the product with a liquid containing a surface modifying agent comprising one or more polyionic species, wherein the polyionic species is attracted to and deposits on the activated surface through a process of ion exchange.

The present invention relates to a process for producing hydrosilylatable, eugenol-based polyethers, to the conversion thereof into polyether siloxanes and also to the products that may be produced by this process and to the use of said products as surfactants.

Methods and compositions for enhancing wellbores and propped fractures for use in geothermal operations are provided. In some embodiments, the methods comprise: drilling with a drilling composition at least a portion of a first wellbore, wherein the drilling composition comprises a base fluid, a resin, and a thermally conductive filler; introducing a fracturing fluid into the first wellbore at a first pressure sufficient to create at least a first set of fractures extending from and in fluid communication with the first wellbore; and introducing a first plurality of proppant particulates into at least the first set of fractures, wherein a second wellbore penetrates at least a second portion of the subterranean formation, and wherein a second set of fractures extends from and is in fluid communication with the second wellbore into the subterranean formation, and the first set of fractures is in fluid communication with the second set of fractures.

Methods and compositions for enhancing wellbores and propped fractures for use in geothermal operations are provided. In some embodiments, the methods comprise: drilling with a drilling composition at least a portion of a first wellbore, wherein the drilling composition comprises a base fluid, a resin, and a thermally conductive filler; introducing a fracturing fluid into the first wellbore at a first pressure sufficient to create at least a first set of fractures extending from and in fluid communication with the first wellbore; and introducing a first plurality of proppant particulates into at least the first set of fractures, wherein a second wellbore penetrates at least a second portion of the subterranean formation, and wherein a second set of fractures extends from and is in fluid communication with the second wellbore into the subterranean formation, and the first set of fractures is in fluid communication with the second set of fractures.

System, including methods and compositions, for making and using emulsions that include a silicone oil and a silicone surfactant. The emulsions may include aqueous droplets disposed in a continuous phase that includes a silicone oil and a silicone surfactant. The aqueous droplets may contain an analyte, optionally at partial occupancy, and/or a luminescent (e.g., photoluminescent) reporter. An assay of the analyte may be performed with the droplets. In some cases, signals may be detected from the droplets, and a characteristic of the analyte, such as an analyte level or activity, may be determined based on the signals.

The present invention generally relates to compositions and methods for forming droplets and/or emulsions. In some embodiments, the compositions and methods comprise two or more components miscible at a first temperature and immiscible at a second temperature, dispersed in an outer phase.