Co2 flooding oil recovery

Table 7 Mole fraction and molecular weights of pseudocomponents Full size table. Shortly after starting CO 2 injection, there was an increase in oil-production rate. This sequence allows a straightforward evaluation of increased recovery because of miscible displacement. Factors affecting process design were:. Table 4. Heidari et al.

World Appl Sci J 31 1 — Google Scholar International AR Undeveloped domestic oil resources: the foundation for increased oil production and a viable domestic oil industry. CO 2 is 2—10 times more soluble in oil than in the water. Correspondence to Arshad Raza. Harpole, K. This alternation of water and CO 2 injection is repeated until additional oil cannot be produced economically. Energies 3 9 —

The Todd-Longstaff mixing model [11] was used to account for viscous fingering, and phase behavior was represented by a pseudoternary diagram. Sahimi M Miscible displacements, flow and transport in porous media and fractured rock. The aim of this paper is to show how oil fields can be screened for miscible CO 2 flooding and why an optimum injection strategy must be chosen for production enhancement. Conventional water-alternating-gas WAG followed with water In this process, a predetermined volume of CO 2 is injected in cycles alternating with equal volumes of water. Several literatures stated about implementation of CO 2 and carbonated water to improve oil recovery since [ 45 , 54 , 58 , 59 ], owing to its availability in adequate amounts from both natural and industrial sources [ 60 ].

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Ahmadi et al. After completing the waterflood in , the CO 2 flood was initiated with the same wells and injection patterns. Immiscible flooding Immiscible flooding depends on oil viscosity reduction, oil phase swelling, the extraction of lighter components, and the fluid drive [ 53 ]. Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. Preliminary screening for suitability of EOR A total number of 15 reservoirs from Pakistan were available for this study with a complete set of data. Carcoana AN Enhanced oil recovery in Rumania.
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World Oil 5 — SPE Prod Eng 5 3 : These data are given in terms of cumulative recovery to date as well as projected ultimate recovery. By Robert D. Particularly, the CO 2 -WAG process with an optimum injection well completion and CO 2 -WAG ratio was technically the most successful method to increase the incremental recovery by more than two times compared to the primary recovery and continuous injection scenarios. Ring, J. Increasing CO 2 injection volumes, Optimizing flood design and well placement for extracting more of the residual oil, Improving the mobility ratio by increasing the viscosity of water by use of polymers, and Extending miscibility by reducing the miscibility pressure through the use of liquefied petroleum gas LPG.
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Several different types of profile modifications were attempted throughout the s. Preliminary results from a recent conformance program indicate the possibility to mechanically isolate mature intervals and redirect CO 2 into oil-bearing intervals that would otherwise remain uncontacted. Even though it is difficult to determine the governing mechanisms for improved oil recovery, it appears that after the initial direct displacement of oil by the solvent bank, lighter components of the remaining oil are recovered by extraction. Most CO 2 flooding processes occur in United States [ 22 ]. The alkaline may also play a beneficial role in reducing surfactant retention in the rock [ 31 , 32 , 33 , 34 ]. In such flooding techniques, the minimum miscibility pressure determined through multiple contact experiments and swelling test to determine the optimum injection conditions. In this section, the importance of well locations in a CCO 2 operation is presented.
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Built by scientists, for scientists. When the reservoir pressure is above the MMP, miscibility between CO 2 and reservoir oil is achieved through multiple-contact or dynamic miscibility, where the intermediate and higher molecular weight hydrocarbons from the reservoir oil vaporize into the CO 2 vaporized gas-drive process and part of the injected CO 2 dissolves into the oil condensed gas-drive process [ 48 ]. Chemical techniques account for about one percent of U. HOT CO 2 flooding should be preferred absence of any major fault makes this technique more effective. Properties of CO 2. Help with editing.
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Properties of reservoirs subjected to CO 2 flooding. Taber JJ Technical screening guides for the enhanced recovery of oil. Four projects are developing techniques for mobility control of the injected CO 2. Extending miscibility by reducing the miscibility pressure through the use of liquefied petroleum gas LPG. When the reservoir pressure is below the MMP or the reservoir oil composition is not favorable, the CO 2 and oil will not form a single phase i. Form Fig.
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