Simulation Study of Steamflooding with Horizontal Producers Using PEBI Grids

Gonzalez, Karin; Bashbush, Jose L.; Rincon, Adafel C.

doi:10.2118/121488-ms

Cited by 4 publications

References 4 publications

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Characterization of Fractal-Like Fracture Network Using Tracer Flowback Tests for a Multifractured Horizontal Well in a Tight Formation

et al. 2022

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Horizontal drilling in combination with hydraulic fracturing has been successfully used to efficiently and effectively exploit tight oil/gas reservoirs where a multibranched fracture network may be generated near a horizontal well which has been confirmed with microseismic events (MSE). Due to their inherent constraints, limited attempts have been made to characterize such complex fracture networks at an individual fracturing stage using tracer flowback tests. In this work, numerical models have been developed, validated, and applied to describe the tracer flowback behavior and characterize the complex fractal-like discrete fracture networks in a tight formation. To be specific, the embedded discrete fracture model (EDFM) is employed to accurately capture the fracture geometry by first discretizing the fractures into various segments and then incorporating such discretized fractures into the matrix. The perpendicular bisector (PEBI) grids are then generated to flexibly conform to the fractures and reduce the grid orientation effects. Subsequently, a reservoir with complex fracture networks is discretized into two separate domains (i.e. matrix and fracture), while nonneighboring connections (NNCs) which can provide fluid communications between the two domains are applied to couple the matrix and embedded fractures. Furthermore, the tracer flowback profiles, which can reveal the complexity of fractal-like discrete fracture networks, are quantified by considering tracer advection, dispersion, and adsorption. Sensitivity analysis has been conducted to examine the effects of iteration number, branch number, deviation angle, scale factor, and the ratio of permeabilities of two cluster fractures on the tracer flowback concentration curves. It is found that the iteration number will greatly affect the tracer flowback concentration, while the deviation angle imposes a minor effect on tracer flowback behavior. An increase in both the branch number and scale factor will decrease the tracer flowback concentration. Two concentration peaks will appear when the permeabilities of the two cluster fractures are different. The larger the difference between the permeabilities of the two cluster fractures is, the greater the difference in the peak arrival time and the peak amplitude will be. In addition, the newly proposed model was verified and then applied to a field case to characterize the complex fractal-like fracture networks, which are confirmed with the microseismic events.

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Characterization of Fractal-Like Fracture Network Using Tracer Flowback Tests for a Multifractured Horizontal Well in a Tight Formation

et al. 2022

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The Model for Predicting Stream Breakthrough Timing during Steam Drive Development of Heavy Oil Reservoirs

Zhai

2011

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During steam drive development of heavy oil Reservoirs, only by predicting steam breakthrough timing and taking measures to prevent steam channeling will avoid the decrease of oil production rate, enlarge swept volume of steam, increase heat utilization ratio and enhanced oil recovery. Based on routine field performance data, the production performance index hosting information of steam breakthrough is transformed into the probability distribution of evaluation index and its Cumulative Distribution Function and Expectation are calculated. By applying Random Predomination Principle and comparing each pair of CDF, random predomination relation among all the indexes is obtained. Then establish an overall optimal sequence degrees matrix, calculate the sort order of production well steam breakthrough timing and sort the production well steam breakthrough timing. Finally, the multi-index forecast model for steam breakthrough timing during steam drive development of heavy oil reservoirs is established. Case application demonstrates that the results got by forecast model correspond with reality and forecast model enlightens steam drive exploration of heavy oil reservoirs.

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Technical and Financial Evaluation of a Process of Cyclic Steam Injection Using Horizontal Wells

et al. 2013

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In order to determine the best operating scheme, and taking into account the increase in demand for oil and the need of increasing the recovery of existing fields, enhanced recovery techniques are an alternative to the oil industry.In Colombia, the stratified deposits of heavy oil have become the focus of oil exploration with EOR methods, including the one which is conceptually evaluated in this paper. However, the production of these fields has been restricted to strata having considerable thickness, forgetting about certain amounts of hydrocarbons from thin strata, representing significant potential for increasing production and reserves.In search of the best alternative for extracting heavy oil reserves are contained in thin strata reservoir, this paper shows the technical and financial evaluation of applying cyclic steam injection using horizontal wells in these fields, using the injectivity and the benefit of the location Horizontal wells, and viscosity reductions product with steam heating. To carry out this process, It was evaluated the effect of each operational and reservoir parameters. Subsequently, due to the uncertainty of the distribution of steam in the reservoir and the importance of heterogeneities in this effect, the numerical simulation was performed with homogeneous and heterogeneous models, comparing productive behavior of each stage, to determine the best model to use in optimizing operational parameters.Once the best scenario was determined it was performed a sensitivity and process optimization, seeking operating conditions that showed the best results with cyclic steam injection in horizontal wells, for further financial analysis that would provide a comprehensive feasibility study .

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Simulation Study of Steamflooding with Horizontal Producers Using PEBI Grids

Cited by 4 publications

References 4 publications

Characterization of Fractal-Like Fracture Network Using Tracer Flowback Tests for a Multifractured Horizontal Well in a Tight Formation

Characterization of Fractal-Like Fracture Network Using Tracer Flowback Tests for a Multifractured Horizontal Well in a Tight Formation

The Model for Predicting Stream Breakthrough Timing during Steam Drive Development of Heavy Oil Reservoirs

Technical and Financial Evaluation of a Process of Cyclic Steam Injection Using Horizontal Wells

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