Method and device for water drive oilfield advantage channel recognition

A technology of advantageous channels and identification methods, applied in the directions of earthwork drilling, mining fluid, measurement, etc., can solve the problems of low understanding, high cost, idealized assumptions, etc., and achieve strong versatility, strong operability, and accuracy high effect

Inactive Publication Date: 2013-03-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 i...

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  • Method and device for water drive oilfield advantage channel recognition
  • Method and device for water drive oilfield advantage channel recognition
  • Method and device for water drive oilfield advantage channel recognition

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Experimental program
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Embodiment 1

[0213] The reservoirs of the selected well test oilfields have good physical properties, are high porosity, medium and high permeability reservoirs, the rocks are loosely cemented, and the content of interstitial substances is small. After years of exploitation, it has now entered a period of high water cut, and the dominant channels in the block are seriously developed, resulting in high residual oil saturation in oil well drainage, serious drainage and flooding of water wells, great differences in vertical water absorption profiles, and rapid breakthrough of water lines. The existence of dominant channels has seriously affected the further improvement of oil recovery.

[0214] Taking Well A of this oilfield as an example to illustrate the practical application of the dominant channel identification method based on unstable well testing. In advance, two unstable well test tests were carried out in Well A of the oilfield, and the time interval between the two tests was more th...

Embodiment 2

[0219] Taking Well B in the test oilfield as an example to illustrate the practical application of the dominant channel identification method based on unstable well testing. The time-varying curves of the bottomhole flowing pressure and its pressure derivative obtained from well B tests (see attached Figure 9 ) and the well test typical characteristic curves of the different levels of dominant channels provided by the present invention (see attached figure 2 , attached image 3 , attached Figure 4 And attached Figure 5A ) for comparison, it can be found that the attached Figure 9 The test curve in Fig. 5 is completely consistent with the trend of the typical characteristic curve in Fig. 5, but differs greatly from other typical characteristic curves. Therefore, it can be judged that there are dominant channels with a high development level around Well B during the test, which can be classified as large tunnel.

[0220] The interpretation result of this well is comple...

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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...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B43/20
Inventor 冯其红王森张先敏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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