Modeling Wettability Alteration in Naturally Fractured Reservoirs

2006 ◽  
Author(s):  
Mojdeh Delshad ◽  
Nariman Fathi Najafabadi ◽  
Glen Allen Anderson ◽  
Gary Arnold Pope ◽  
Kamy Sepehrnoori
Keyword(s):  
Fractured Reservoirs ◽  
Naturally Fractured Reservoirs ◽  
Wettability Alteration ◽  
Naturally Fractured

Numerical Investigation of Wettability Effects on Two-Phase Flow in Naturally Fractured Reservoirs Using Complex System Modelling Platform

2021 ◽  
Author(s):  
Mohammad Sedaghat ◽  
Hossein Dashti
Keyword(s):  
Complex System ◽  
Relative Permeability ◽  
Oil Recovery ◽  
Fractured Reservoirs ◽  
Naturally Fractured Reservoirs ◽  
Wettability Alteration ◽  
System Modelling ◽  
Naturally Fractured ◽  
Relative Permeability Curves

Abstract Wettability is an essential component of reservoir characterization and plays a crucial role in understanding the dominant mechanisms in enhancing recovery from oil reservoirs. Wettability affects oil recovery by changing (drainage and imbibition) capillary pressure and relative permeability curves. This paper aims to investigate the role of wettability in matrix-fracture fluid transfer and oil recovery in naturally fractured reservoirs. Two experimental micromodels and one geological outcrop model were selected for this study. Three relative permeability and capillary pressure curves were assigned to study the role of matrix wettability. Linear relative permeability curves were given to the fractures. A complex system modelling platform (CSMP++) has been used to simulate water and polymer flooding in different wettability conditions. Comparing the micromodel data, CSMP++ and Eclipse validated and verified CSMP++. Based on the results, the effect of wettability alteration during water flooding is stronger than in polymer flooding. In addition, higher matrix-to-fracture permeability ratio makes wettability alteration more effective. The results of this study revealed that although an increase in flow rate decreases oil recovery in water-wet medium, it is independent of flow rate in the oil-wet system. Visualized data indicated that displacement mechanisms are different in oil-wet, mixed-wet and water-wet media. Earlier fracture breakthrough, later matrix breakthrough and generation and swelling of displacing phase at locations with high horizontal permeability contrast are the most important features of enhanced oil recovery in naturally fractured oil-wet rocks.

Modeling Wettability Alteration By Surfactants in Naturally Fractured Reservoirs

2009 ◽  
Vol 12 (03) ◽  
pp. 361-370 ◽  
Author(s):  
Mojdeh Delshad ◽  
Nariman Fathi Najafabadi ◽  
Glen Anderson ◽  
Gary A. Pope ◽  
Kamy Sepehrnoori
Keyword(s):  
Fractured Reservoirs ◽  
Naturally Fractured Reservoirs ◽  
Wettability Alteration ◽  
Naturally Fractured

Test and First Results of an EOR Wettability Alteration Foam Injection Test in a Naturally Fractured Reservoir

2015 ◽  
Author(s):  
J. Salvador Flores Mondragón ◽  
César Andres Bernal Huicochea ◽  
Luis Silvestre Zamudio Rivera ◽  
Eduardo Buenrostro González ◽  
Luis Manuel Perera Pérez ◽  
...  
Keyword(s):  
New Technologies ◽  
Fractured Reservoirs ◽  
Oil Production ◽  
Gas Production ◽  
Economic Feasibility ◽  
Naturally Fractured Reservoirs ◽  
Assessment Model ◽  
Wettability Alteration ◽  
Fractional Flow ◽  
Naturally Fractured

In mature fields, low oil production, increased gas production and water fractional flow of low pressure reservoir combined with the mobility ratio between the gas and oil feed contacts the w/o induced by the oil extraction process are accentuated in naturally fractured reservoirs (NFR) -. It is common N2 injection for pressure maintenance and decline of oil production; however N2 causes channeling towards producing wells. In various fields - NFR, closure of oil production by this mechanism loss value make unprofitable oil production and surface facilities for handling demanding high volume gas and / or water or gas production out of specification. In volumes estimated residual oil trapped in areas invaded by the gas cap and in areas of lower conductivity can be recovered if it has clearly identified enhanced recovery processes. Previous efforts to this work results showed potential benefits in terms of increased oil production and the significant reduction of Gas-Oil Ratio (GOR) and the technical and economic feasibility of using this type of process with surfactants developed specifically for the conditions of this area The technology tested and evaluated under methodological process is based on new supramolecular complexes wettability modifier, corrosion inhibitor and able to generate stable foams under high pressure, temperature and salinity, which penetrate and invade the channels of high conductivity formation cause decreased flow of gas by reducing gas mobility. The product in the liquid phase diffuses into the channels of lower conductivity which cannot penetrate the foam, and by spontaneous imbibition mechanism resulting from the change of wettability of the rock surface and reducing interfacial tension and favors an increase the oil recovery factor in naturally fractured reservoirs. The application of a methodological process allowed the parameters measurement and evaluation of test results, visualizing future opportunities for the new chemicals. This project was approved after evaluation from a process of allocation of federal funds. With the purpose of defining the further steps in the search for the chemicals stability and risk mitigation stages of industrial upgrading for the complexity the NFR, the following discussion is presented. In order to accelerate the knowledge of new technologies and its deployment on the field, PEMEX has diversified the efforts, to achieve the principal goals regarding new technologies. This will provide greater ability to assess best practices and technologies. To evaluate the efforts of companies a performance assessment model was designed and apply from 2008, which takes into account the integral complexity of each technology to attend the specific challenges from an Asset and to be fair in comparing the results obtained for the particular design of the test. The aim of this paper is to describe the results and the methodology used for developing the performance evaluation and identifying the new opportunities in the state of the art of these tests.

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