Method and device for water drive oilfield advantage channel recognition

Abstract

The invention discloses a method and a device for water drive oilfield advantage channel recognition. Unstable pressure restore well testing data are applied to recognize advantage channels formed during development of water drive oilfields. The method includes: step of setting a well testing typical characteristic curve layout, step of calculating well testing bottom pressure derivatives, step of drawing a testing well relation curve and step of judging existence and development level of the advantage channels, and the device comprises a typical characteristic curve layout setting module, a well bottom pressure measuring module, a well bottom pressure derivative calculation module, a testing well relation curve drawing module and a judging module. Compared with the prior art, the method for water drive oilfield advantage channel recognition is high in accuracy, high in generality, easy to implement, high in operability and capable of providing technical support for implementation of subsequent oilfield yield-increasing measures and designing of recovery ratio improving schemes.

Description

technical field [0001] The invention relates to a technology for identifying dominant channels in water flooding oilfields, in particular to a method and device for identifying dominant channels in water flooding oilfields by using an unstable well test method to identify dominant channels formed in the development process of water flooding oilfields. Background technique [0002] During the long-term water injection development of oilfields, the reservoir pore structure will change greatly. Geological factors such as oil layer heterogeneity, development factors such as excessively fast production speed, and changes in oil layer pressure will increase the pore throat radius and permeability of the reservoir, thus forming secondary high-permeability strips in the reservoir. That is, the dominant channel. In the process of oilfield development, the most sensitive development parameters of the dominant channel are pressure and production, and the data collected from the well t...

AI Technical Summary

Problems solved by technology

However, the theoretical basis of existing dominant channel identification methods is not perfect. When establishing mathematical models, they are often only based on the assumption of Darcy seepage or pipe flow, and do not take into account the different seepage states corresponding to different levels of dominant channels and their impact on the identification of dominant channels. In addition, tracer testing and hydraulic detection methods are expensive, and the parameter interpretation process has more qualitative components, is strongly influenced by human subjectivity, and has weak operability, which is not conducive to on-site implementation; The well logging method can qualitatively identify the layer where the dominant channel exists, but it cannot judge the development level of the dominant channel. The basic model is simple and easy to calculate, but the assumption is too idealized and does not meet the actual situation of the dominant channel

Images