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STUDY OF ADSORPTION AND DESORPTION OF ASPHALTENE-PARAFFIN-RESIN INHIBITOR DEPOSITS IN THE PORE SPACE OF CARBONATE RESERVOIRS
The research of the formation of asphaltene-paraffin-resin deposition (APRD) in the micro pore volume of the reservoir for the study of oil found in microvolume long oil paraffin saturation temperature at 6-9 °C higher than in the void volume. Early transition paraffins in the solid phase leads to complications associated with the formation of APRD, reduces the effectiveness of the use of physical and chemical methods of preventing the formation of APRD dosing of the inhibitor on the bottom of the well. To prevent the formation of paraffin in the oil reservoir authors proposed the use of bottomhole formation zone as a natural inhibitor of the dispenser APRD in oil. Studies on adsorption of the inhibitor on the walls of the breed in its injection into the formation, and subsequent desorption elution inhibitor of the formation of crude oil. Analysis of experimental results has allowed to establish an effective concentration of the inhibitor in paraffin oil during its injection into the bottomhole formation zone, the adsorption of the inhibitor on the walls of rock, as well as the duration of the desorption of the inhibitor from the formation. It was found that the injection of paraffin inhibitor solution in the bottomhole formation zone will reduce the saturation temperature of the paraffin oil in the pore space of the collector.
RESEARCH OF INFLUENCE OF ASPHALTENE-RESIN SUBSTANCES INTO OIL ON THE FORMATION OF ASPHALTENE-PARAFFIN-RESIN DEPOSITION
The completion phase of an oil field development is characterized by increased water cutting of well production, reservoir and bottom-hole pressures decline, growth of high molecular weight (HMW) components content in crude oil. These aspects make field operations more hazardous as they lead to formation of asphaltene-paraffin-resin deposition (APRD) on borehole walls and equipment. The impact of HMW components in crude oil and water-cut on pressure and temperature conditions of APRD and on its rate needs detailed study.
This paper presents some results of the analysis of oil paraffin saturation point depending on asphaltene-resin substances (ARS) content under reservoir conditions. Dependence of the rate of APRD on a cold well walls and resin substances content in oil is studied. The results of experiments with low-resin and high-paraffin crude oil show that asphaltenes and resins in oil dispersion system can result in depressive effects. According to the results, asphaltene-resin substances are natural depressants, making the temperature of paraffin appearance in oil lower, and their properties depend on the base of oil.
The results of the rate of APRD show that sedimentation stability of dry crude oil with increasing of ARS content remains almost stable and does not have any impact on deposition, whereas in experiments with wet crude oil increased ARS content leads to significantly higher deposition.
THE MOBILE DEVICE DESIGN FOR OIL OPTICAL PROPERTIES MEASURING IN THE PERFORMANCE OF FIELD-GEOLOGIC TASKS
Theoretical and practical basis of oil optical properties was described in the paper. Results of numerous laboratory experiments of density, viscosity, optical density D and coefficient of light absorption Cla of oil probe were analyzed in various oil and gas provinces in the Russian Federation. The brief description of an oil sample photocolorimetry researches procedure was reported. The statistical data processing was conducted that consist in estimation of a mean-square deviation, variance of the deviation and variation coefficient of oil coefficient of light absorption. It fixed up correlative dependency between density and coefficient of light absorption, also between viscosity and coefficient of light absorption.
It showed up description, international and Russian oil ranging, where oil is permeated with a hyperviscosity and an average density. The oil typification in character of density and mean-square deviation of Cla approximation was conducted, 3oil classes were selected with sufficiently high value approximation validity – light (with density ρ<870kg/m3), middle (with density 870<ρ<920kg/m3) and heavy oil (with density ρ>920kg/m3). In character of viscosity and mean-square deviation of Cla approximation 3oil classes were selected with sufficiently high value approximation validity – low-viscosity (with viscosity 1<μ<5mPa·s), over viscosity (with viscosity 5<μ<30mPa·s) and high-viscosity oil (with viscosity μ>30mPa·s).
Came up with the decision to improve of oil optical researches and optical method control of oil field development. The mobile device hook up of automated optical properties measurement and processing of oil on the well mouth was established by oil density, viscosity and coefficient of light absorption that let enhance precision and reliability of optical method field-geological control of oil field development and get reliable field-geological information in real-time.