Productivity prediction method of fishbone horizontal well segmented coupling

Abstract

The invention provides a productivity prediction method of fishbone horizontal well segmented coupling. The method includes the steps of firstly, using a segmenting method to segment a complex structure; secondly, building a shaft flow model; thirdly, using an iteration method to solve an equation set of fluid flow in an oil reservoir and flow coupling in a shaft; fourthly, solving the model after space transformation; fifthly, using an s-K* method to process stratum anisotropic conditions. The method has the advantages that the complex well body structure can be described precisely, the complex shaft flow features can be reflected reasonably, the reservoir anisotropy is considered, and the method conforms to actual oil reservoir conditions and is high in calculation precision and applicable to oil fields.

Description

technical field [0001] The invention relates to the field of improving oil recovery in oil and gas field development, in particular to a productivity prediction method for segmental coupling of fishbone horizontal wells. Background technique [0002] Compared with conventional vertical wells and horizontal wells, multi-branch horizontal wells have the advantages of further increasing drainage area, increasing oil well production, increasing oil recovery rate, improving reserve control degree, increasing recoverable reserves, improving recovery rate and saving drilling costs, etc. It has become a hot spot in the development and research of petroleum development technology at home and abroad in the 21st century. Practice shows that fishbone horizontal wells, as a type of multi-branch horizontal wells, have been drilled and developed in different types of reservoirs with the continuous improvement of their drilling and production technology, and have achieved high initial produ...

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Problems solved by technology

Second, there is a lack of applicable and reliable productivity prediction and analysis methods for fishbone horizontal wells

The current representative (semi)analytical models suitable for productivity prediction of fishbone horizontal wells have the following shortcomings in describing the shape and flow characteristics of branched horizontal wells: (1) the model is only suitable for single phase; (2) most models do not Comprehensive consideration of the influence of wellbore pressure drop; (3) Most of the models are only suitable for stable seepage conditions in infinite formations; (4) Most models cannot consider the influence of heterogeneous reservoirs; (5) The method is simplified and the calculation accuracy is low

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