Method for selecting refracturing target well of tight oil and gas reservoir

Abstract

The invention provides a method for selecting a refracturing target well of a tight oil and gas reservoir. The method comprises the following steps of: determining a well completion efficiency of a well to be screened; determining the unit reservoir quality of the well to be screened; using the unit reservoir quality as a horizontal ordinate and the well completion efficiency as a longitudinal ordinate to draw a scatter diagram of the well completion efficiency and the unit reservoir quality; using transverse and longitudinal division lines for dividing the scatter diagram of the well completion efficiency and the unit reservoir quality into four parts to form an intersection diagnosis diagram, wherein the left upper part of the intersection diagnosis diagram is a re-examination development necessity region; the right upper part of the intersection diagnosis diagram is a high-productivity well high-refracturing-risk region; the left lower part of the intersection diagnosis diagram is a current stage non-considering region; the right lower part of the intersection diagnosis diagram is an optimum refracturing well region; the transverse division lines select straight lines with the well completion efficiency being 50 percent; and the longitudinal division lines are selected according to economic benefits; performing judgment on the basis of the intersection diagnosis diagram; and completing the selection of the refracturing target well of the tight oil and gas reservoir. The method has the advantage that the refracturing target well can be fast and effectively selected.

Description

Technical field [0001] The invention relates to a method for selecting a target well, in particular to a method for selecting a target well for repeated fracturing of tight oil and gas reservoirs, and belongs to the technical field of oil exploitation. Background technique [0002] The development of tight oil and gas reservoirs requires the support of hydraulic fracturing technology to obtain economic production. Repeated fracturing technology refers to re-fracturing the fractured development wells to slow down their production decline and increase potential production. The United States Natural Gas Research Institute (GRI, now known as the Gas Technology Institute GTI) investigated the potential production of 48 tight gas wells in the United States through repeated fracturing in 1996, and the results showed that the potential production of these wells exceeded 1 trillion in 5 years. Cubic feet. The study also pointed out that for an oil field, 85% of the potential production i...

AI Technical Summary

Problems solved by technology

Although the pattern recognition technology / virtual intelligence method is better than the other two methods, there is still no satisfactory method that can quickly select refracturing from a large number of fractured wells for different geological characteristics. method of targeting wells

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