ORTHO-ESTER BASED SURFACTANTS AND CONJUGATED METHODS Russian patent published in 2011 - IPC C09K8/62 E21B43/27 

FIELD: chemistry.

SUBSTANCE: invention relates to surfactants, particularly treatment liquids which contain ortho-ester based surfactants, and conjugated methods. The methods of processing an underground formation, involving preparation of treatment liquid, emulsified in one embodiment and containing a liquid base, and in another embodiment containing an oil phase, an aqueous phase having pH of approximately 8.5 or more, and an ortho-ester based surfactant, where at least a portion of the ortho-ester based surfactant has the presented structural formula, and introduction of said liquid into the underground formation. The method of easing flow through a pipeline, involving preparation of an emulsified treatment liquid containing an ortho-ester based surfactant, where at least a portion of the ortho-ester based surfactant has the presented structural formula, an oil phase and an aqueous phase having pH of approximately 8.5 or more, flow of this liquid through the pipeline, reduction of the pH of the aqueous phase to make easy decomposition of at least a portion of the ortho-ester based surfactant while easing separation of the oil and aqueous phases. The invention is developed in subclaims.

EFFECT: high efficiency of the treatment liquid.

18 cl, 2 ex