«Proceedings of Gubkin University»

Formulation and properties of composition for core insulation

UDC: 622.243.572
DOI: 10.33285/2073-9028-2023-4(313)-32-42

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: core, isolated core sampling, sealed core-holder, rheology, oscillatory rheometry, hydraulic calculations, core-sampling fluid

Annotation:

Herein we note a modern tendency on how to improve quality of initial information about saturation in formations, and one of the decisions the so-called “insulated” core-sampling technology. The main goals achieved in the selection of an isolated core are listed. The existing compositions for filling core holders, requirements for their physico-chemical properties are discussed. The description of the composition proposed by the authors based on synthetic oil and synthetic rubber is given, the peculiarity of gelation of the composition at temperatures above 60 °C is noted. The possibilities of oscillatory rheometry with a small amplitude for the study of concentrated dispersed systems are explained, the experimental technique is discussed. For synthetic rubber suspensions in synthetic oil with product concentration from 1 to 10 % by weight, the results of measurements of shear modulus and phase shift angle under heat treatment conditions are presented: sequential heating and cooling from 35 to 85 °C. The temperature range of gelation of compositions is reported at 60 ± 5 °C. An algorithm for calculating hydraulic losses in a sealed core holder is discussed in order to determine the maximum operational viscosity of the composition.

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