A comprehensive evaluation method for production dynamic model and productivity of fractured horizontal wells in shale oil

Abstract

The present invention provides a comprehensive evaluation method for production dynamic mode and productivity of fracturing horizontal wells in shale oil; including: obtaining the productivity level data of fracturing horizontal wells in the research area and the values ​​of potential productivity influencing factors; The main controlling factors of the initial production level and cumulative production level of fractured horizontal wells; calculate the weight ratio of the main controlling factors; establish the comprehensive evaluation coefficient of initial production level and cumulative production level of fractured horizontal wells in the study area; Comprehensive evaluation criteria for the production dynamic model of fractured horizontal wells; establishment of the initial production level prediction formula of fractured horizontal wells in the research area; acquisition of decline index and initial decline rate under each production dynamic mode; evaluation of the production dynamic mode and initial production rate of the research well production level, establish a production capacity decline formula, and predict the change law of its production capacity. The relative error between the production capacity predicted by the invention and the production data of one shale oil fracturing horizontal well is less than 5.9%, which meets the accuracy requirements of the oil field and can meet the production prediction requirements.

Description

technical field [0001] The invention relates to the technical field of shale oil development; in particular, it relates to a production dynamic mode and comprehensive evaluation method for fracturing horizontal wells in shale oil. Background technique [0002] After major breakthroughs in unconventional oil and gas such as tight sandstone oil, tight carbonate rock oil, and shale condensate oil in North America, my country has also made major breakthroughs in shale reservoirs in the Ordos, Junggar, Bohai Bay, and Sichuan basins. It is found that shale oil has become a new bright spot of unconventional oil and gas in the world (Zou Cai et al., 2013a; Gao Jian, 2019). The rapid development of shale oil in the United States has reduced its dependence on foreign crude oil from 60% in 2005 to 45% in 2011. In 2010, the evaluation results of shale oil resources showed that my country's oil shale geological reserves were 1,160.2 billion tons, and the recoverable shale oil resources w...

AI Technical Summary

Problems solved by technology

The disadvantage of the statistical analysis method in evaluating productivity is that when establishing the relationship between factors affecting fracturing horizontal wells and productivity, the internal relationship between factors is not considered, and all factors are generally considered without distinguishing between primary and secondary factors Establishing a production capacity forecasting model will lead to many factors to be considered in the established model and the model is too complicated

There are many production dynamic models of fractured horizontal wells in shale oil, and the general production capacity prediction model will obviously lead to poor prediction results

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