Experimental investigation of heavy oil recovery from fractured-porous carbonate core samples by secondary surfactant-added injection

Abstract

In this study, the description of Enhance Oil Recovery effectivity (EOR) of surfactant denominated reagent A, at the secondary waterflooding process for heavy oil recovery from fractured-porous carbonate core samples were investigated experimentally. For this experiment have been selected two cores, 14,75 cm long and 3 cm diameter were stacked in a long 3D confining core holder. In the first step, cores have been saturated by brine. In the second step, cores have been saturated of heavy oil through the water-saturated core sample for two-phase saturation. In the third step, we provided the injecting of water through the core sample for measuring oil recovery factor (by cold water 20ºC) simulating the primary recovery at these conditions. In the fourth step, was injected of 2 pore volumes of Reagent A through the core sample for measuring oil recovery factor (by reagent A) and simulating the slug. In the fifth step and final, was injected water through the core sample for measuring full oil recovery factor (by cold water) after slug of Reagent A. In the course of experiments, oil and water productions, pressure and temperatures of system were monitored and regulated carefully.

The Application of X-ray Micro Computed Tomography (Micro-CT) of Core Sample for Estimation of Physicochemical Treatment Efficiency

“…To study the condition of the bottomhole producing formation at a pressure drop below the gas saturation pressure of oil, and as a consequence -deposition of asphaltenes in pores, a filtration unit, construction of which is described in detail was used [33].…”

“…Ever-increasing share of non-conventional oil and gas reserves in the total amount of active stocks makes oil companies improve the quality of laboratory tests by assessing both the initial state of reservoir rock samples, and their state after various influences [5,16,29,30,[32][33][34]44,45]. To date, there are not many direct research methods of core material of different fields without the physical destruction of the core samples, including from the fields with hard to recover reserves of oil and gas.…”

The Application of X-ray Micro Computed Tomography (Micro-CT) of Core Sample for Estimation of Physicochemical Treatment Efficiency (Russian)

“…Для изучения состояния призабойной зоны продуктивного пласта при падении давления ниже давления насыщения нефти газом, и, как следствиевыпадение асфальтенов в поровом пространстве, было проведено с использованием фильтрационной установки, конструкция которой детально описана в работе [33]. Для изучения состояния призабойной зоны продуктивного пласта при падении давления ниже давления насыщения нефти газом, и, как следствиевыпадение асфальтенов в поровом пространстве, было проведено с использованием фильтрационной установки, конструкция которой детально описана в работе [33].…”

“…Все более увеличивающаяся доля нетрадиционных запасов нефти и газа в общем объеме активных запасов заставляет нефтяные компании повышать качество проведения лабораторных испытаний по оценке как исходного состояния образцов горных породколлекторов, так и изучения их состояния после различного рода воздействий [5, 16,29,30,[32][33][34]44,45]. Все более увеличивающаяся доля нетрадиционных запасов нефти и газа в общем объеме активных запасов заставляет нефтяные компании повышать качество проведения лабораторных испытаний по оценке как исходного состояния образцов горных породколлекторов, так и изучения их состояния после различного рода воздействий [5, 16,29,30,[32][33][34]44,45].…”