Enhancing oil recovery by electric current impulses well treatment: A case of marginal field from Oman

Fuel ◽  
2022 ◽  
Vol 314 ◽  
pp. 123115
Author(s):  
Svetlana Rudyk ◽  
Usman Taura ◽  
Mohammed Al-Jahwary
2021 ◽  
Author(s):  
Chukwunonso Uche ◽  
Samuel Esieboma ◽  
Jennifer Uche ◽  
Ibrahim Bukar

Abstract "Marginal field" was introduced to the oil and gas industry to identify those fields that have negative economic effects in its development. More specifically it is possible to define a marginal field as a field that is cost ineffective to develop with conventional oil and gas means of technology. Economic development of marginal fields in most cases requires the use of existing processes to minimize cost of finding evolving technologies in development of reserves. This paper generally evaluates the feasibility of using the enhanced oil recovery technique to improve reserves in a marginal field operating environment. A marginal heavy oil field in the offshore environment of the Niger Delta region which started production in 2011 is used as a case study to evaluate the feasibility of the use of enhanced oil recovery method to improve recovery. Due to poor mobility ratio in this heavy oil field and its associated big aquifer sizes, pockets of unrecovered oil have been left behind the water fronts and water cut has risen above 80% in most of the producing wells. Recent integrated field evaluation shows that the recovery factor is poor compared to the size of oil originally in place and this triggered the need to process subsurface assessments of developing such reserves that exist in any marginal field using enhanced oil recovery technique. This paper therefore goes through the fundamental scope of an enhanced oil recovery study process to determine the applicability of this technology in a marginal oil field.


1982 ◽  
Vol 22 (05) ◽  
pp. 750-754 ◽  
Author(s):  
A. Herbert Harvey

Abstract A mathematical model is proposed for approximating the distribution of resistance heating in a process that employs an alternating electric current to heat an oil reservoir. The model assumes radial flow both of fluid and of current. Introduction We have been investigating the feasibility of an oil recovery technique that would employ an alternating electric current to heat an oil reservoir. The process should improve the mobility ratio at the displacement front, since the viscosity of most oils is more temperature-sensitive than the viscosity of water. Thermal expansion of heated oil also may make some contribution to oil recovery. The selective electric reservoir heating (SERH) process would employ electrodes installed in water injection wells, and high-salinity water would be injected during heating. This low-resistivity fluid would reduce heating in the portion of the reservoir that has been invaded by this fluid. It also would cool the electrode sufficiently so that boiling (which would break the electric circuit) would not occur, and it would displace some of the heated oil to production wells where it can be recovered. Model for Resistive Adjacent Beds A relatively simple model of the heating process can be developed if we consider a homogeneous, horizontal, isotropic reservoir that is uniform in thickness and bounded above and below by highly resistive formations. For this system we assume that the flows both of injected water and of electricity are radial near the injection well (Fig. 1). The region invaded by injected water is a cylinder with radius r and an average resistivity of R. The outer boundary of the model used to represent the system is a cylinder with a radius of r, which is half the distance between adjacent electrode wells in a pattern flood. The average resistivity of the portion of the reservoir that has not yet been contacted by injected water is R. Since we have assumed that R and R are not functions of r, and since the same current flows in the invaded and uninvaded zones, we can show by integration of Ohm's law that percent heating (1) percent heating (1) where Eq. 1 gives the percentage of heating that occurs in the uninvaded portion of the reservoir (where heating is desired) when the radius of the invaded portion of the reservoir is r. The percentage of heating that occurs in the uninvaded zone is equal to the percentage of the voltage drop that occurs in this zone. Resistivities in Eq. 1 may be estimated. (2) (3) These resistivities are functions of time, since water resistivity decreases with an increase in temperature, and since water saturations may change during the recovery process. process. If we consider the case of a constant injection rate, with injected water displacing the formation water, the radius of the invaded zone is given by (4) SPEJ P. 750


Author(s):  
Zh.E. Dzhakupova ◽  
◽  
Zh.K. Zhatkanbayeva ◽  
R.S. Begaliyeva ◽  
D.K. Salimova ◽  
...  
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