Determination of porosity and permeability of a porous medium as a result of polymer structuring of disintegrated quartz sand using the IPNG-PLAST 2 technology

UDK: 622.276.031.011:53.09
DOI: 10.24887/0028-2448-2018-8-52-54
Key words: semi consolidated sand, chemical conglomeration, polymeric composition, x-ray micro computed tomography, porosity and permeability calculations
Authors: A.A. Pachezhertsev (Moscow Institute of Physics and Technology, RF, Dolgoprudny), A.A. Erofeev (Moscow Institute of Physics and Technology, RF, Dolgoprudny), D.A. Mitrushkin (Moscow Institute of Physics and Technology, RF, Dolgoprudny), A.I. Tsitsorin (Oil and Gas Research Institute of RAS, RF, Moscow), D.A. Kaushansky (Oil and Gas Research Institute of RAS, RF, Moscow), V.B. Demianovskiy (Oil and Gas Research Institute of RAS, RF, Moscow), A.N. Dmitrievsky (Oil and Gas Research Institute of RAS, RF, Moscow)

High filtration rates and pressure gradients in the bottomhole formation zone affect the mechanical properties of the reservoir, causing additional rock deformations. In this regard, long-term exploitation of oil wells leads to destruction of the bottomhole formation zone and removal of mechanical impurities into the wellbore. That leads to problems in the work of downhole and ground equipment, reduction of time between overhaul period and increase in downtime of wells. To consolidate the rock and prevent the removal of mechanical impurities from the bottomhole formation zone, the polymer-based composition IPNG-Plast 2 was developed. An important factor in the effectiveness of this composition is the preservation of the reservoir properties of the bottomhole formation zone after well treatment.

This article presents the results of a study of the influence of the polymer composition of IPNG-Plast 2 on the characteristics of porous space of artificial core samples. To study the internal structure and structure of pore space, the method of computer microtomography was applied. This method allows to investigate the internal structure of objects with high accuracy and without destroying the samples. Based on the results obtained, digital models of pore space were constructed; the total porosity and absolute permeability were calculated by solving the simplified Navier – Stokes equations by the finite volume method. As a result, insignificant changes were observed in the absolute values of the total porosity and the structure of the pore space. Calculation of permeability showed more significant changes after injection of the composition both in absolute values and in spatial distribution in the bulk of the sample. In general, a slight change in reservoir properties of artificial cores as a result of structuring using the IPNG-Plast 2 technology was revealed.


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