Shale oil fractured horizontal well production dynamic mode and productivity comprehensive evaluation method

Abstract

The invention provides a shale oil fractured horizontal well production dynamic mode and productivity comprehensive evaluation method. The method comprises the steps of obtaining productivity level data of a fractured horizontal well in a to-be-studied area and numerical values of potential productivity influence factors; respectively evaluating main control factors of the initial production leveland the cumulative production level of the fractured horizontal well in the research area; calculating the respective weight proportions of the main control factors; establishing an initial production level comprehensive evaluation coefficient and an accumulated production level comprehensive evaluation coefficient of the fractured horizontal well in the research area; establishing a comprehensive evaluation standard of the production dynamic mode of the fractured horizontal well in the research area; establishing an initial production level prediction formula of the fractured horizontal wellin the research area; obtaining a decline index and an initial decline rate under each production dynamic mode; evaluating and researching the production dynamic mode and the initial production levelof the well, establishing a productivity decline formula, and predicting the productivity change rule. The relative error between the predicted productivity and the production data of one shale oil fractured horizontal well is smaller than 5.9%, the requirement for the precision of an oil field is met, and the production prediction requirement can be met.

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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