Dependencies Of Reservoir Oil Properties On Surface Oil

Al-Obaidi, Sudad H; AP, Galkin

doi:10.31219/osf.io/789wp

Cited by 9 publications

(9 citation statements)

References 4 publications

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“…It should be noted that terms such as "full saturation" and "moisture capacity" are incorrect. In the gas-water system, it is most accurate to refer to the mass of water vapour as "equilibrium content", but for brevity, "full saturation" or "moisture capacity" is used (Al-Obaidi et al 2005). The moisture content of a gas depends on the composition of the gas, its pressure and temperature.…”

Section: Methodsmentioning

confidence: 99%

Calculation Method for Determining the Gas Flow Rate Needed for Liquid Removal from the Bottom of the Wellbore

Hofmann

Al-Obaidi

Khalaf³

et al. 2021

nat

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As a result of flooding and accumulations of liquid at the bottomholes, the operating conditions of gas wells become complicated, so that they end up self-squeezing and losing of gas production. A method is proposed for determining the technological parameters of operation of the gas wells with the purpose of removing liquid from the bottom of the wells. Data from the gas dynamics and special studies were used to develop this method, which has been tested on one of the oil and gas condensate fields. It offers the possibility to increase the accuracy of the information provided by the fund and to ensure that the production wells are operated as efficiently as possible with the use of this method. In the case of liquid accumulation in the well that is insignificant, or when water is present in the well, the technique is beneficial in that it allows determining the technological parameters of well operation and ensuring the removal of the liquid from the bottom of the well.

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Section: Methodsmentioning

confidence: 99%

Calculation Method for Determining the Gas Flow Rate Needed for Liquid Removal from the Bottom of the Wellbore

Hofmann

Al-Obaidi

Khalaf³

et al. 2021

nat

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“…The residual water saturation of the rock, S wr , determined by the direct method (from the core taken during drilling with an anhydrous solution) or by indirect methods (centrifugation, with semipermeable membranes, etc. ), should be corrected taking into account the reservoir conditions [12,13]. If we assume that the main change in S wr occurs due to the deformation of the pore space of the rock during core drilling due to the reduction of the effective stress, then we can write:…”

Section: Methodsmentioning

confidence: 99%

Experimental Study About Water Saturation Influence on Changes in Reservoirs Petrophysical Properties

Al-Obaidi

Smirnov

Alwan³

2021

Walailak J Sci & Tech

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Experimental determination of the physical properties of rocks under conditions simulating in situ reservoir conditions is of great importance both for the calculation of reserves and for the interpretation of well logging data. In addition, it is also important for the preparation of hydrocarbon field development projects. The study of the processes of changes in the petrophysical properties of the reservoir under controlled conditions allows not only to determine their reliability but also to evaluate the dynamics of these changes depending on the temperature and pressure conditions of the reservoir and the water saturation of the rocks. In this work, an evaluation of the dependence of the physical properties of hydrocarbon reservoirs on their water saturation (Sw) was carried out. Residual water saturation (Swr) was created in the rocks and the properties of these rocks were compared at the states of partial (25 %) and complete water saturation (100 %). The changes in petrophysical parameters of partially water saturated rocks during the increase in effective pressure were studied and estimates of these changes were obtained. The results showed that when the effective pressure is increased, the Swr increases by an average of 6 % compared to atmospheric conditions. This is accompanied by an increase in the velocity of longitudinal (by 51.9 % on average) and lateral waves (by 37.1 % on average). As residual water saturation increases, effective permeability decreases for both standard and reservoir conditions, with, gas permeability decreasing for both dry samples (by 23 % on average) and samples with residual water saturation (effective permeability decreases by 27 % on average). HIGHLIGHTS Changes in physical properties of hydrocarbon reservoirs by determining physical properties (permeability, porosity, elastic, electrical, deformation strength) under the standard conditions and in physical modelling of reservoir conditions and processes Assessment of the effectiveness of water saturation on the physical properties of the reservoir Comparisons between the petrophysical properties of reservoir core samples in which the pore space is fully saturated with the reservoir fluid model and samples with residual water saturation Experimental determination of the physical properties of rocks under conditions simulating in situ reservoir conditions Estimation of the changes in petrophysical parameters of partial water-saturated rocks during the increase in effective formation pressure GRAPHICAL ABSTRACT

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“…But the production costs associated with oil and gas production are constantly growing, at the same time, oil prices are falling, which leads to the fact that the economic attractiveness of enhanced oil recovery methods decreases. At the same time, with the use of modern methods of increasing recoverable reserves from productive formations, the oil recovery factor is on average 30-70% [27], of which 20-25% -by primary development methods (using the reservoir energy potential), and 25 -35% -by secondary methods (waterflooding and gas injection to maintain reservoir energy) . Thus, the methods of enhanced oil recovery of oil increase the recoverable world oil reserves by 1.5 times, and this is up to 65 billion tons [28].…”

Section: Conclusion Forced Extraction Of Fluidsmentioning

confidence: 99%

Analysis of Hydrodynamic Methods for Enhancing Oil Recovery

Al-Obaidi¹

2021

Preprint

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In the modern world, the hydrocarbons represent a raw material for various industries, therefore, the fight against the problem of extracting residual oil is relevant and important at this stage of human development. In connection with the high demand for hydrocarbons and the rise in world oil prices, research is being actively carried out on methods for enhancing oil recovery. Hydrodynamic methods of enhanced oil recovery represent one of the most effective and relevant methods by which the residual oil can be extracted. According to this, the current article pays special attention to several types of hydrodynamic methods forenhancing oil recovery. In this work it has been focused on three main types of hydrodynamic enhanced oil recovery methods; unsteady (cyclic) waterflooding, changing the directions of flows and forced fluid Extraction.

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Dependencies Of Reservoir Oil Properties On Surface Oil

Cited by 9 publications

References 4 publications

Calculation Method for Determining the Gas Flow Rate Needed for Liquid Removal from the Bottom of the Wellbore

Calculation Method for Determining the Gas Flow Rate Needed for Liquid Removal from the Bottom of the Wellbore

Experimental Study About Water Saturation Influence on Changes in Reservoirs Petrophysical Properties

Analysis of Hydrodynamic Methods for Enhancing Oil Recovery

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