scholarly journals Enhanced oil recovery: Projects planning strategy in Angolan oilfields

2021 ◽  
Vol 2 (2) ◽  
pp. 1-11
Author(s):  
Geraldo Andre Raposo Ramos ◽  
Kyari Yates
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Energy Demand ◽  
Hydrocarbon Exploration ◽  
Oil Fields ◽  
Residual Oil ◽  
Planning Strategy ◽  
Secondary Recovery ◽  
The Government ◽  
Conventional Type

Hydrocarbon exploration in Angola commenced in 1910 with its first oil recovered in 1955. The proven reserves in Angola are estimated to reach up to 13 billion barrels (2.1 billion m3). Most of the Angolan oil fields are mature or maturing and some are or may be abandoned due to unprofitable recovery limit beyond the conventional type of oil production. The oil recovery is mainly by primary and secondary recovery methods. Apart from the issue of maturity, there is increasing energy demand due to population growth and difficulties in discovering and developing new fields as alternatives to the current oil fields. For incremental and sustained production rate of these fields and in addition to instability of oil prices and concerns about future oil supply, Angola has started to work towards developing affordable and efficient technologies capable of recovering residual oil in reservoirs as well as extend the life of many current fields which can be achieved through the implementation of enhanced oil recovery (EOR). Therefore, this paper discusses the EOR planning strategy from project selection, project implementation and optimization, and field abandonment. It further highlights the mutual benefits that may be derived from a cross-collaboration between the government and other stakeholders in Angola.

scholarly journals Enhanced Oil Recovery: Projects Planning Strategy in Angolan Oilfields

2021 ◽  
Vol 2 (2) ◽  
pp. 1-11
Author(s):  
Geraldo Andre Raposo Ramos ◽  
Kyari Yates
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Energy Demand ◽  
Hydrocarbon Exploration ◽  
Oil Fields ◽  
Residual Oil ◽  
Planning Strategy ◽  
Secondary Recovery ◽  
The Government ◽  
Conventional Type

Hydrocarbon exploration in Angola commenced in 1910 with its first oil recovered in 1955. The proven reserves in Angola are estimated to reach up to 13 billion barrels (2.1 billion m3). Most of the Angolan oil fields are mature or maturing and some are or may be abandoned due to unprofitable recovery limit beyond the conventional type of oil production. The oil recovery is mainly by primary and secondary recovery methods. Apart from the issue of maturity, there is increasing energy demand due to population growth and difficulties in discovering and developing new fields as alternatives to the current oil fields. For incremental and sustained production rate of these fields and in addition to instability of oil prices and concerns about future oil supply, Angola has started to work towards developing affordable and efficient technologies capable of recovering residual oil in reservoirs as well as extend the life of many current fields which can be achieved through the implementation of enhanced oil recovery (EOR). Therefore, this paper discusses the EOR planning strategy from project selection, project implementation and optimization, and field abandonment. It further highlights the mutual benefits that may be derived from a cross-collaboration between the government and other stakeholders in Angola.

Organizational and Economic Problems of Enhanced Oil Recovery in Russian Fields

2007 ◽  
pp. 123-133
Author(s):  
D. Ramazanov
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Oil Production ◽  
State Regulation ◽  
Hydrocarbon Exploration ◽  
Oil Fields ◽  
Strategy Of Development ◽  
Oil Resources ◽  
The Us ◽  
Production Industry

Modern conditions and problems of development of the oil-production industry in Russia are considered in article. It is shown that the present structure of oil resources will not provide oil production according to estimates of the Energy Strategy to 2020. The program of increasing hydrocarbon exploration for oil fields and provinces accepted by the Ministry of Natural Resources of RF due to inefficient state regulation is lagging behind the schedule. We suggest that the federal program on introduction of modern enhanced oil recovery methods providing both the growth of oil production in the nearest 5-15 years and more efficient use of oil resources through increase of oil extraction ratio be accepted as an alternative strategy of development of oil production. The US experience of effective resources using and its applicability for the Russian oil-production industry are also considered in the article.

Application of Electromagnetic Waves and Dielectric Nanoparticles in Enhanced Oil Recovery

2013 ◽  
Vol 26 ◽  
pp. 135-142 ◽  
Author(s):  
Hasnah Mohd Zaid ◽  
Noor Rasyada Ahmad Latiff ◽  
Noorhana Yahya ◽  
Hasan Soleimani ◽  
Afza Shafie
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Electromagnetic Waves ◽  
Sodium Dodecyl ◽  
Thermal Method ◽  
Residual Oil ◽  
Sweep Efficiency ◽  
Left Behind ◽  
Secondary Recovery ◽  
Invasive Method

Enhanced oil recovery (EOR) refers to the recovery of oil that is left behind in a reservoir after primary and secondary recovery methods, either due to exhaustion or no longer economical, through application of thermal, chemical or miscible gas processes. Most conventional methods are not applicable in recovering oil from reservoirs with high temperature and high pressure (HTHP) due to the degradation of the chemicals in the environment. As an alternative, electromagnetic (EM) energy has been used as a thermal method to reduce the viscosity of the oil in a reservoir which increased the production of the oil. Application of nanotechnology in EOR has also been investigated. In this study, a non-invasive method of injecting dielectric nanofluids into the oil reservoir simultaneously with electromagnetic irradiation, with the intention to create disturbance at oil-water interfaces and increase oil production was investigated. During the core displacement tests, it has been demonstrated that in the absence of EM irradiation, both ZnO and Al2O3 nanofluids recovered higher residual oil volumes in comparison with commercial surfactant sodium dodecyl sulfate (SDS). When subjected to EM irradiation, an even higher residual oil was recovered in comparison to the case when no irradiation is present. It was also demonstrated that a change in the viscosity of dielectric nanofluids when irradiated with EM wave will improve sweep efficiency and hence, gives a higher oil recovery.

A Laboratory Experimental and Reservoir Simulation Estimation on Minimum Miscible Pressure (MMP) for CO2 Injection in HIL Oil Field

2020 ◽  
Author(s):  
H. Hilal
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Reservoir Simulation ◽  
Energy Demand ◽  
Promising Result ◽  
Oil Field ◽  
Co2 Injection ◽  
Co2 Gas ◽  
Secondary Recovery ◽  
Simulation Estimation

As one of the Enhanced Oil Recovery (EOR) methods, CO2 injection is one of the methods used after secondary recovery to increase oil recovery. Based on the successful application of CO2 injection in some countries and the need of fulfillment of energy demand in Indonesia, CO2 injection can be the best method to be used for EOR. This method injects CO2 that has been observed in the laboratory through injection well to reservoir. In the reservoir, CO2 gas will be miscible with oil to decrease oil’s viscosity. But, to be miscible with oil and to avoid the reservoir problem, the Minimum Miscible Pressure (MMP) must be observed in the laboratory. Moreover, a reservoir simulation investigation must be performed to get a promising result. In this paper, the laboratory experimental and reservoir simulation on MMP to achieve CO2 gas miscibility on oil sample from HIL oil field has been performed. The MMP result from the laboratory experiment is 2385 psia and is increasing oil recovery up to 85% while the MMP from reservoir simulation is 2404 psia. With the differential value of just 19 psia or error of 0. 89%, this finding can be the basis for a recommendation to develop a CO2 project in the HIL oil field.

Saturated carbon dioxide nanofluids enhanced oil recovery in carbonate reservoir cores using nuclear magnetic resonance

2021 ◽  
Author(s):  
Yongsheng Tan ◽  
Qi Li ◽  
Liang Xu ◽  
Xiaoyan Zhang ◽  
Tao Yu
Keyword(s):  
Carbon Dioxide ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Carbonate Reservoir ◽  
Carbonate Reservoirs ◽  
Residual Oil ◽  
Core Flooding ◽  
Nuclear Magnetic

<p>The wettability, fingering effect and strong heterogeneity of carbonate reservoirs lead to low oil recovery. However, carbon dioxide (CO<sub>2</sub>) displacement is an effective method to improve oil recovery for carbonate reservoirs. Saturated CO<sub>2</sub> nanofluids combines the advantages of CO<sub>2</sub> and nanofluids, which can change the reservoir wettability and improve the sweep area to achieve the purpose of enhanced oil recovery (EOR), so it is a promising technique in petroleum industry. In this study, comparative experiments of CO<sub>2</sub> flooding and saturated CO<sub>2</sub> nanofluids flooding were carried out in carbonate reservoir cores. The nuclear magnetic resonance (NMR) instrument was used to clarify oil distribution during core flooding processes. For the CO<sub>2</sub> displacement experiment, the results show that viscous fingering and channeling are obvious during CO<sub>2</sub> flooding, the oil is mainly produced from the big pores, and the residual oil is trapped in the small pores. For the saturated CO<sub>2</sub> nanofluids displacement experiment, the results show that saturated CO<sub>2</sub> nanofluids inhibit CO<sub>2</sub> channeling and fingering, the oil is produced from the big pores and small pores, the residual oil is still trapped in the small pores, but the NMR signal intensity of the residual oil is significantly reduced. The final oil recovery of saturated CO<sub>2</sub> nanofluids displacement is higher than that of CO<sub>2</sub> displacement. This study provides a significant reference for EOR in carbonate reservoirs. Meanwhile, it promotes the application of nanofluids in energy exploitation and CO<sub>2</sub> utilization.</p>

Cyclical Gel-Polymer Flooding Technology is an Effective Method of Enhanced Oil Recovery in High-Viscosity Oil Fields

2020 ◽  
Author(s):  
Svetlana Yur’evna Lobanova ◽  
Berdibek Ulanovich Yelubaev ◽  
Nikolay Evgen’evich Talamanov ◽  
Zhijian Sun ◽  
Chunxi Wang ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
High Viscosity ◽  
Polymer Flooding ◽  
Oil Fields ◽  
High Viscosity Oil

scholarly journals Evaluation of an alkali-polymer flooding technique for enhanced oil recovery in Trinidad and Tobago

2020 ◽  
Vol 10 (8) ◽  
pp. 3947-3959
Author(s):  
Kyle Medica ◽  
Rean Maharaj ◽  
David Alexander ◽  
Mohammad Soroush
Keyword(s):  
Trinidad And Tobago ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Energy Demand ◽  
Xanthan Gum ◽  
Net Present Value ◽  
Flow Characteristics ◽  
Absorption Capacity ◽  
Polymer Flooding ◽  
Screening Criteria

Abstract Trinidad and Tobago (TT) is seeking to develop more economical methods of enhanced oil recovery to arrest the decline in crude oil production and to meet the current and future energy demand. The utilization of alkaline-polymer flooding to enhance oil recovery in TT requires key studies to be conducted to obtain critical information of the flooding system (soil type, additive type, pH, adsorption characteristics and rheological (flow) characteristics). Understanding the role of, interplay and optimizing of these variables will provide key input data for the required simulations to produce near realistic projections of the required EOR efficiencies. The parameters of various wells in TT were compared to the screening criteria for alkali-polymer flooding, and the EOR 4 well was found to be suitable and thus selected for evaluation. Laboratory adsorption studies showed that the 1000 ppm xanthan gum flooding solution containing 0.25% NaOH exhibited the lowest absorption capacity for the gravel packed sand and exhibited the lowest viscosity at all the tested shear rates. The lowest adsorption was 2.27 × 10−7 lbmole/ft3 which occurred with the 1000 ppm xanthan gum polymer containing 0.25% NaOH, and the evidence showed that the polymer was adsorbed on the other side of the faults, indicating that it has moved further and closer to the producing well. Implementation of an alkali polymer flooding resulted in an incremental increase in the recovery factors (~ 3%) compared to polymer flooding; however, a change in the oil recovery as a function of the alkaline concentration was not observed. The simulated economic analysis clearly shows that all the analysed EOR scenarios resulted in economically feasible outcomes of net present value (NPV), Internal Rate of Return (IRR) and payback period for oil price variations between $35 and $60 USD per barrel of oil. A comparison of the individual strategies shows that the alkali-polymer flood system utilizing 0.25% sodium hydroxide with 1000 ppm xanthan gum is the best option in terms of cumulative production, recovery factor, NPV, IRR and time to payback.

Sign in / Sign up

Export Citation Format

Share Document