A Study On The Waterflood Development Of Complex Fault Block Reservoir

In recent years, more and more number of old oil fields, field-development, with the development of the rise of the number of years, most of the oil field is facing secondary recovery, three mining, water development has become a priority, the longer the mining, reservoir facing the formation energy are consumed in the formation pressure drop, a large number of underground crude oil degassing, an increase in viscosity, oil production is greatly reduced, even Minting discontinued, resulting in underground leaves a large amount of dead oils not. Deficit caused by underground in order to compensate for the crude oil recovery, to maintain or increase reservoir pressure, high and stable yield of the oil field, and obtain a higher recovery factor, oil field water injection.However, due to some domestic oilfields special geological conditions, complex fault block oil and gas reservoirs in the reservoir development occupy an increasingly important position, the so-called small complex fault block, is the reservoir of complex geological structure, the fault plane the reservoir is divided into many small pieces, such reservoir development wells network layout and injection wells network layout adds a lot of difficulties.Grape Valley Oilfield Portuguese Portuguese Block10not only is a complex fault block reservoir, but also a high saturation pressure reservoir. The main features of the high saturation pressure reservoir is gas-oil ratio is very high, crude oil volume factor is relatively large, so that the contraction in the pressure drop is very powerful, full differential pressure is relatively small. High saturation pressure reservoir in an oil development process, the formation pressure below the saturation pressure, reservoir degassing serious formation pressure dropped significantly, crude oil in the gas gradually volatile, resulting in a low degree of recovery.Portugal Portugal10blocks of the end of2003to invest in developing, reservoir structure typical of the complex fault block reservoir with multiple sets of oil-bearing and are great differences in physical properties, oil-water relationships are more complex, more development unit, the smaller. During the development phase, the reservoir conditions a series of changes, the reservoir formation excessive energy consumption, formation pressure decreased significantly, but the reservoir structure is more complex, injection wells bit to select the more difficult, injection wells network layout not ideal, is difficult to form the the perfect injection and gateway system, a growing problem in the development process, in order to effectively solve the existing problems in the development, to further improve the level of the reservoir development, waterflood development research is very important.Given the current status of the development of the Grape Valley Oilfield reveals Portugal Portugal10blocks from the sedimentary microfacies, micro-structure, fault sealing, flow unit, reservoir heterogeneity and numerical reservoir simulation and injection-production relationship complex fault block reservoirs major reservoirs remaining oil distribution characteristics, formation mechanism and its influencing factors, a comprehensive understanding of the geological characteristics of the reservoir, through the analysis of the development process, to study the law of oil well production, analysis of wells in production pattern, the reservoir development status and adaptability evaluation, reservoir engineering method absorbent effect evaluation and injection wells network adaptive analysis, and the remaining oil analysis and numerical simulation methods, in the quantitative analysis of the remaining oil potential and research remaining in the plane and on the vertical distribution in accordance with the characteristics of the remaining oil, the injection patterns to further improve and expand the water injection swept volume, improve the utilization rate of injected water, to improve the non-main layer funds and other technical measures to develop several sets of injection wells network development plan and development program indicators to forecast the final selection of the optimal solution.