Method for designing space structural well network of fractured-vuggy reservoir based on variable coefficient

Abstract

The invention provides a method for designing a space structural well network of a fractured-vuggy reservoir based on the variable coefficient. The method is characterized in that a plurality of wells are arranged in an oilfield block, and the method for designing the space structural well network of the fractured-vuggy reservoir based on the variable coefficient comprises the steps that S1, a plurality of initial injection-production schemes are determined according to the positions of all the wells and the types of reservoir bodies of all the wells; S2, the injection-production well communicating degrees of all the initial injection-production schemes are calculated; S3, the variable coefficients of the injection-production well communicating degrees are calculated correspondingly according to the injection-production well communicating degrees of all the initial injection-production schemes; and S4, the initial injection-production scheme with the minimum variable coefficient is selected as a final injection-production scheme. According to the method for designing the space structural well network of the fractured-vuggy reservoir based on the variable coefficient, one-way effect realizing caused by water channeling of injected water along a preferential migration passage is avoided, and thus the utilization rate of the injected water is increased.

Description

Technical field [0001] The present invention relates to the technical field of oil and gas exploration and development, and more specifically, the present invention relates to a method for optimizing water injection and oil production in a well pattern with a fractured-cavity reservoir space structure. Background technique [0002] my country's marine carbonate reservoirs are mainly distributed in the Tarim Basin, and are dominated by fractures and caves. The Ordovician reservoir in Tahe Oilfield is the largest fracture-cavity reservoir that has been discovered in my country. As of the end of 2016, the proven petroleum geological reserves had reached 1.336 billion tons. The Tahe fractured-vuggy reservoir started water injection in 2005. As of the end of 2016, unit water injection covered 598 million tons of geological reserves, accounting for 69% of the developed volume. It has become the main supplementary energy development method for Tahe Oilfield. [0003] The spatial structu...

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Problems solved by technology

On the other hand, the injection-production well pattern of fracture-vuggy reservoirs is constructed on the basis of the initial well pattern through oil well transfer injection. According to the above principles, multiple sets of plans may be obtained. How to further optimize the design is not mentioned.

Therefore, the existing technology cannot meet the needs of fine development

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