Oil rim reservoirs present unique problems during production. This is because of the proximity of the water and/or gas to the oil in the pay zone leading to phase distortion due to pressure disequilibrium during production of the oil. The resultant effect is early water/gas breakthroughs which ultimately lead to increased well operational cost, damage to production equipment and eventually to early loss of the well. Production rate becomes crucial as it directly or indirectly affects the overall recovery efficiency from the well. Low rate production signifies longer well production period due to delayed breakthrough time but at the expense of higher well operational cost per unit volume of oil produced, while higher rate production signifies higher oil volume per unit cost of well operation but with increased risk of losing the well due to water/gas breakthrough. Operators produce at a rate deemed economic in order to make profits. Most economic rates are higher than the critical rate which is the rate considered that coning would be maximally delayed. To optimize production, it is necessary to recover most of the fluid from the reservoir before abandonment. Higher recovery factors means that less volume of fluid is left in the reservoir at abandonment. The optimum oil production rate is the best economic oil rate that would result to the highest recovery factor obtainable from that well. The question is what rate is considered optimal and how can it be calculated? This work presents a mathematical model solution for the calculation of the optimum oil production rate. It takes cognizance of the recovery factor and the time value of money and present an analytical model to calculate the optimum oil production rate. From the work the optimum oil production rate was calculated to be 918.63stb/d while the critical oil rate was calculated to be 20.17stb/d.
| Published in | Petroleum Science and Engineering (Volume 3, Issue 2) |
| DOI | 10.11648/j.pse.20190302.14 |
| Page(s) | 60-67 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2019. Published by Science Publishing Group |
Oil Rim, Optimum Oil Rate, Coning, Economic Rates
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APA Style
Obibuike Ubanozie Julian, Ekwueme Stanley Toochukwu, Ohia Nnaemeka Princewill, Igwilo Kevin Chinwuba, Igbojionu Anthony Chemazu, et al. (2019). Mathematical Approach to Determination of Optimum Oil Production Rate in Oil Rim Reservoirs. Petroleum Science and Engineering, 3(2), 60-67. https://doi.org/10.11648/j.pse.20190302.14
ACS Style
Obibuike Ubanozie Julian; Ekwueme Stanley Toochukwu; Ohia Nnaemeka Princewill; Igwilo Kevin Chinwuba; Igbojionu Anthony Chemazu, et al. Mathematical Approach to Determination of Optimum Oil Production Rate in Oil Rim Reservoirs. Pet. Sci. Eng. 2019, 3(2), 60-67. doi: 10.11648/j.pse.20190302.14
AMA Style
Obibuike Ubanozie Julian, Ekwueme Stanley Toochukwu, Ohia Nnaemeka Princewill, Igwilo Kevin Chinwuba, Igbojionu Anthony Chemazu, et al. Mathematical Approach to Determination of Optimum Oil Production Rate in Oil Rim Reservoirs. Pet Sci Eng. 2019;3(2):60-67. doi: 10.11648/j.pse.20190302.14
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author = {Obibuike Ubanozie Julian and Ekwueme Stanley Toochukwu and Ohia Nnaemeka Princewill and Igwilo Kevin Chinwuba and Igbojionu Anthony Chemazu and Kerunwa Anthony},
title = {Mathematical Approach to Determination of Optimum Oil Production Rate in Oil Rim Reservoirs},
journal = {Petroleum Science and Engineering},
volume = {3},
number = {2},
pages = {60-67},
doi = {10.11648/j.pse.20190302.14},
url = {https://doi.org/10.11648/j.pse.20190302.14},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.pse.20190302.14},
abstract = {Oil rim reservoirs present unique problems during production. This is because of the proximity of the water and/or gas to the oil in the pay zone leading to phase distortion due to pressure disequilibrium during production of the oil. The resultant effect is early water/gas breakthroughs which ultimately lead to increased well operational cost, damage to production equipment and eventually to early loss of the well. Production rate becomes crucial as it directly or indirectly affects the overall recovery efficiency from the well. Low rate production signifies longer well production period due to delayed breakthrough time but at the expense of higher well operational cost per unit volume of oil produced, while higher rate production signifies higher oil volume per unit cost of well operation but with increased risk of losing the well due to water/gas breakthrough. Operators produce at a rate deemed economic in order to make profits. Most economic rates are higher than the critical rate which is the rate considered that coning would be maximally delayed. To optimize production, it is necessary to recover most of the fluid from the reservoir before abandonment. Higher recovery factors means that less volume of fluid is left in the reservoir at abandonment. The optimum oil production rate is the best economic oil rate that would result to the highest recovery factor obtainable from that well. The question is what rate is considered optimal and how can it be calculated? This work presents a mathematical model solution for the calculation of the optimum oil production rate. It takes cognizance of the recovery factor and the time value of money and present an analytical model to calculate the optimum oil production rate. From the work the optimum oil production rate was calculated to be 918.63stb/d while the critical oil rate was calculated to be 20.17stb/d.},
year = {2019}
}
TY - JOUR T1 - Mathematical Approach to Determination of Optimum Oil Production Rate in Oil Rim Reservoirs AU - Obibuike Ubanozie Julian AU - Ekwueme Stanley Toochukwu AU - Ohia Nnaemeka Princewill AU - Igwilo Kevin Chinwuba AU - Igbojionu Anthony Chemazu AU - Kerunwa Anthony Y1 - 2019/11/11 PY - 2019 N1 - https://doi.org/10.11648/j.pse.20190302.14 DO - 10.11648/j.pse.20190302.14 T2 - Petroleum Science and Engineering JF - Petroleum Science and Engineering JO - Petroleum Science and Engineering SP - 60 EP - 67 PB - Science Publishing Group SN - 2640-4516 UR - https://doi.org/10.11648/j.pse.20190302.14 AB - Oil rim reservoirs present unique problems during production. This is because of the proximity of the water and/or gas to the oil in the pay zone leading to phase distortion due to pressure disequilibrium during production of the oil. The resultant effect is early water/gas breakthroughs which ultimately lead to increased well operational cost, damage to production equipment and eventually to early loss of the well. Production rate becomes crucial as it directly or indirectly affects the overall recovery efficiency from the well. Low rate production signifies longer well production period due to delayed breakthrough time but at the expense of higher well operational cost per unit volume of oil produced, while higher rate production signifies higher oil volume per unit cost of well operation but with increased risk of losing the well due to water/gas breakthrough. Operators produce at a rate deemed economic in order to make profits. Most economic rates are higher than the critical rate which is the rate considered that coning would be maximally delayed. To optimize production, it is necessary to recover most of the fluid from the reservoir before abandonment. Higher recovery factors means that less volume of fluid is left in the reservoir at abandonment. The optimum oil production rate is the best economic oil rate that would result to the highest recovery factor obtainable from that well. The question is what rate is considered optimal and how can it be calculated? This work presents a mathematical model solution for the calculation of the optimum oil production rate. It takes cognizance of the recovery factor and the time value of money and present an analytical model to calculate the optimum oil production rate. From the work the optimum oil production rate was calculated to be 918.63stb/d while the critical oil rate was calculated to be 20.17stb/d. VL - 3 IS - 2 ER -
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