Multi-level evaluation method of horizontal-well volume fracturing effect influence factors

Abstract

The invention discloses a multi-level evaluation method of horizontal-well volume fracturing effect influence factors. The method sequentially includes the following steps: 1) establishing an evaluation index database, which includes a sample set, a fracturing effect influence factor set and an evaluation index main-factor set; 2) establishing a multi-level evaluation system according to the evaluation index database; 3) utilizing a grey correlation analysis method to calculate all influence factor weight coefficients in the multi-level evaluation system, sorting the same to clarify primary-secondary relationships, and evaluating a fracturing effect; and 4) calculating a comprehensive reservoir evaluation factor, classifying reservoirs where all fracturing wells are located, and evaluatingthe fracturing effect. According to the method, the factors of volume-fracturing horizontal-well reservoir physical-properties, fracturing construction and production dynamics and the like are comprehensively considered, a purpose of multi-level evaluation on the horizontal-well volume fracturing effect influence factors is achieved through calculating the weight coefficients of all the influencefactors of different levels and the comprehensive reservoir evaluation factor, and an important guiding role is played on horizontal-well volume fracturing optimization design and development of tight oil reservoirs.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas development, in particular to a multi-level evaluation method for factors affecting volumetric fracturing effects of horizontal wells in the process of hydraulic fracturing. Background technique [0002] Horizontal well volume fracturing technology is the key technology to realize the shale gas revolution in North America, and it has been widely used in the world. Most of the tight oil reservoirs in my country have the characteristics of poor reservoir physical properties, strong heterogeneity, and low natural productivity. Some of its reservoirs cannot be developed by conventional water injection to form an effective injection-production well pattern, and hydraulic fracturing must be carried out before production. In recent years, major oil and gas fields in China have learned from the successful experience of foreign countries in volume transformation, and carried out exploration and fiel...

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Problems solved by technology

[0008] None of the above three methods comprehensively consider reservoir physical properties, fracturing construction, production dynamics and other factors at the same time, and at the same time consider fewer parameters for each type of factor, which is not comprehensive enough

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