DOI: 10.24411/2076-6785-2019-10067
Abstract
The article is devoted to laboratory research in the field of oilfield chemistry. The object of the study is an acid-hydrocarbon emulsion system (KUES), based on the initial chemical reagents of various classes, for complex treatments of borehole zones of carbonate reservoirs. The purpose of the work is the scientificallybased development and study of the physicochemical properties of an acidhydrocarbon emulsion system to increase the efficiency of processing a carbonate oil formation by increasing the depth of penetration of a hydrophobic emulsion into the depth of the formation, as a result of a multiple (an order of magnitude) slowdown of the reaction rate of acid microglobules in the
emulsion with the formation rock, washing off the oil film saturated with asphalteneresinous substances from the pore surface of the formation and regulating the rheological parameters of hydrophobic first emulsion over time.
As a result of the studies, a formulation of an acid-hydrocarbon emulsion system with a specific component and concentration range of components was developed, which is characterized by an optimal set of physicochemical parameters. Expected results — improving the efficiency and success of the oil production facilities at wells developed by PJSC TATNEFT.
Materials and methods
Studies have been conducted to test the starting ingredients of the class hydrocarbon solvents, surfactants, emulsifiers, acids. Optimized the selection of the best properties of the initial components of the KNES. A technique has
been developed for preparing a composition on an emulsion basis with a given aggregative and sedimentation stability over time. Using the modern instrumentation, instrumentation and methodological basis, the basic
physicochemical, rheological and dispersed characteristics and properties of the CES are studied. On model installations simulating the motion (filtration) of KUES of different formulations through the carbonate material
of the formation, the mechanism of deflection and treatment of core material of different permeability with acidic emulsions was tested.
Keywords
carbonate reservoir, laboratory tests, physicochemical properties, hydrophobic emulsion, component composition, optimal formulation
