Tight oil fractured horizontal well productivity main control factor judgment and productivity prediction method

Abstract

The invention provides a tight oil fractured horizontal well productivity main control factor evaluation and productivity prediction method. The method comprises the following steps of determining potential influence factors of tight oil fractured horizontal well productivity; establishing a fractured horizontal well productivity comprehensive evaluation system adapting to the research area; acquiring related data; judging productivity master control factors of the fractured horizontal well in the research area; calculating the weight proportion of the main control factor in the category; establishing a productivity level prediction formula of the fractured horizontal well in the research area; and establishing a productivity decline prediction model of the fractured horizontal well in theresearch area, and predicting an oil well productivity decline rule. The tight oil fractured horizontal well productivity predicted by the productivity prediction method provided by the invention hashigh goodness of fit with field production data, the oil production data of one horizontal well is compared with a prediction result, the relative error is less than 7%, the prediction precision is relatively high, and the production requirements can be met.

Description

technical field [0001] The invention relates to the field of tight oil development; in particular, it relates to a method for judging main controlling factors of production capacity of fracturing horizontal wells in tight oil and for predicting production capacity. Background technique [0002] At present, tight oil has become one of the most important unconventional oil and gas resources in the world. China is rich in tight sandstone oil and gas resources, which are widely distributed in the Junggar Basin, Ordos Basin, Sichuan Basin, and Songliao Basin. The preliminary evaluation of tight oil resources in major basins is 8-10 billion tons (Jia Chengzao et al., 2012; Zou Cai et al., 2012 ). With the development of technologies such as acid fracturing, multi-stage fracturing and long horizontal wells, the development effect of tight oil reservoirs has been significantly improved, and it is expected to become an important oil and gas replacement resource, alleviate my country...

AI Technical Summary

Problems solved by technology

[0021] The purpose of the present invention is to overcome the shortcomings of the existing technical solutions, such as the difficulty in judging the main control factors of the production capacity of tight oil fracturing horizontal wells and the low accuracy of production prediction, and to provide a main control of the production capacity of tight oil fracturing horizontal wells based on the gray correlation method. The method of factor evaluation and productivity prediction improves the accuracy of productivity master factor evaluation and productivity prediction, and adapts to the development needs of tight oil reservoirs

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