Separate zone waterflooding technology policy limitation before reservoir water breakthrough

Abstract

The invention discloses a separate zone waterflooding technology policy limitation before reservoir water breakthrough. The separate zone waterflooding technology policy limitation comprises the following steps of firstly, considering multiple factors comprehensively, establishing a series of injection-production well group typical models, then carrying out numerical simulation research of multi-layer joint injection on the models, taking the water breakthrough time level difference as the longitudinal equilibrium displacement criterion, and evaluating the longitudinal dynamic non-equilibrium degree before reservoir water breakthrough through the Lorentz coefficient; and finally, determining the separate zone waterflooding technology policy limitations before reservoir water breakthrough with different rhythmicity and different well pattern forms according to a Lorentz coefficient warning value. The separate zone waterflooding technology policy limitation before reservoir water breakthrough is more accurate, simpler and easier to operate, can provide the guidance for the division of the oil field on-site separate zone waterflooding technology policy limitations, so that the oil reservoir development effect is improved, and the oil reservoir recovery rate is increased.

Description

technical field [0001] The present invention relates to the technical field of oil and gas field development, in particular to a technical policy boundary of layered water injection before water breakthrough in reservoirs; the technical policy boundaries of layered water injection before water breakthrough in oil reservoirs with different rhythms and different well patterns are proposed and applied on site More precise and convenient. Background technique [0002] Most of the reservoirs in China's oilfields are continental clastic rock deposits, with strong vertical heterogeneity and serious interlayer conflicts. Layered water injection is an important measure to reduce interlayer conflicts, increase and stabilize production, and has been widely used in oilfield development. In actual oil fields, there are often dozens or even hundreds of small layers. The current technology cannot realize complete layered water injection. The delineation of technology policy boundaries is ...

AI Technical Summary

Problems solved by technology

In actual oil fields, there are often dozens or even hundreds of small layers. The current technology cannot realize complete layered water injection. The delineation of technology policy boundaries is a very important part of this

[0003] There are various limitations in the traditional boundary of layered water injection: ① In the initial stage, it is generally based on the single factor boundary of layered water injection, and whether the boundary of each factor is satisfied is judged one by one.

In the process of fuzzy evaluation, the setting of weight has strong subjectivity; even if the weight is obtained by AHP, the initial scale matrix is ​​difficult to overcome the influence of subjectivity

③ In the development stage, consider the difference in saturation of each layer during the development process, introduce the concept of pseudo-seepage resistance, and establish its grade difference boundary, but this is still an equivalent single-phase flow idea, and it is difficult to reflect the non-destructive nature of water flooding oil before water breakthrough. Pistony

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