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Tytuł pozycji:

Un-recovered oil by vertical wells with water coning - assessment, prediction and remediation

Tytuł:
Un-recovered oil by vertical wells with water coning - assessment, prediction and remediation
Autorzy:
Wojtanowicz, A. K.
Hernandez, J.
Temat:
ropa niesczerpywalna
kontakt ropa-woda
stożek wodny
symulacja numeryczna
un-recovered oil
contact oil-water
water coning
numerical simulations
Źródło:
Wiertnictwo, Nafta, Gaz.
Typ dokumentu:
Article
Język:
English
Dostęp URL:
http://yadda.icm.edu.pl/baztech/element/bwmeta1.element.baztech-article-AGH5-0023-0007  Link otwiera się w nowym oknie
Numer akcesji:
edsbzt.bwmeta1.element.baztech.article.AGH5.0023.0007
Periodyk
Water invasion mechanism - called water coning - affects vertical wells completed above the Oil-Water contact (OWC) in oil reservoirs with bottom water. The objective of this study was to quantify the amount of by-passed oil for a variety of the bottom water well-reservoir systems with water invasion to wells and to assess feasibility of downhole water sink completions to reduce oil by-passing. A large statistical population of possible reservoirs with bottom-water has been created using databases of actual reservoir properties worldwide. Dimensional analysis coupled with Monte Carlo method allowed converting statistics of reservoir properties into dimensionless group distributions. Then, the amount of by-passed oil was correlated with the dimensionless groups using three--level full-factorial designed experiments conducted with a reservoir simulator. A reservoir - well system with bottom water was modelled using a commercial black oil simulator with two concentric radial layers of oil pay and the aquifer zone having different sizes and properties. The resulting dimensionless correlations determine the expected value of by-passed oil at the end of well's operation. The correlations are general as they cover a wide range of reservoir-well systems. When the correlations are coupled with the reservoirs' population the results show that, for example, more than 25 percent of movable oil volume could be by-passed in one half of all the bottom-water reservoirs. The study also identifies dimensionless groups that mostly control water invasion - the end-point mobility ratio and well spacing. The results also reveal two mechanism of water invasion: coning or uniform OWC advancement. Numerical reservoir simulation is also used to investigate the well completion's length and placement that would minimize oil bypassing and optimize recovery. Single completions of different penetration (length) are compared to dual well completions with Downhole Water Drainage/Sink (DWS), for new wells and marginal (watered-out) wells. The results show that the best completion strategy for both the new and the marginal wells is the use of (or intervention with) DWS completions. DWS would delay water breakthrough, stimulate oil inflow by reducing water saturation around the well, and maximize Net Present Value by accelerating recovery.

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