Fracture-cave type reservoir space structure injection-production pattern optimal design method

Abstract

The invention provides a fracture-cave type reservoir space structure injection-production pattern optimal design method. Multiple wells are arranged in an oil field block; and the fracture-cave type reservoir space structure injection-production pattern optimal design method comprises the following steps: S1) multiple initial injection-production schemes are determined according to the positions of all the wells or the types of reservoir bodies of all the wells; S2) the communication degrees of the injection-production wells in each initial injection-production scheme are calculated; S3) Gini coefficients of the communication degrees of the injection-production wells are calculated according to the communication degrees of the injection-production wells in each initial injection-production scheme; and S4) the initial injection-production scheme with the smallest Gini coefficient is selected as a final injection-production scheme. The fracture-cave type reservoir space structure injection-production pattern optimal design method prevents one-way acting caused by feeding of injected water along a high-guide channel, and improves the conformance efficiency of the injected water.

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 an optimized design method for water injection and oil production of a well pattern with a space structure of a fracture-cavity reservoir. Background technique [0002] my country's marine carbonate reservoirs are mainly distributed in the Tarim Basin and are dominated by fracture-cavity types. 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 spa...

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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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