Method of predicting steam huff-puff early productivity of heavy oil reservoir horizontal well

Abstract

The invention relates to a method of predicting steam huff-puff early productivity of a heavy oil reservoir horizontal well and belongs to the field of oil-gas field development. The method comprises the steps of 1) establishing a heavy oil reservoir thermal recovery mathematical model based on percolation theory; 2) establishing a nondimensional productivity curve for the horizontal well; 3) recognizing major factors influential to the nondimensional productivity curve of step 2); 4) drawing a nondimensional productivity chart of the horizontal well; 5) predicting steam huff-puff early oil production of the horizontal well under test based on the nondimensional productivity chart of the horizontal well in step 4). The method of the invention has the advantages that initial multiple regression is performed according to the factors influential to the steam huff-puff productivity of a horizontal well to obtain a formula of calculating maximum daily oil production peak of the horizontal well; the steam huff-puff early productivity of a horizontal well can be predicted conveniently and accurately according to the nondimensional productivity chart provided herein.

Description

technical field [0001] The invention relates to a method for predicting initial productivity of steam huff and puff of a horizontal well in a heavy oil reservoir, belonging to the field of oil and gas field development. Background technique [0002] Correct prediction of steam huff and puff production performance of horizontal wells is the basis for optimizing steam injection process parameters and efficient development of heavy oil reservoirs. At present, the methods for predicting and analyzing steam huff and puff productivity of horizontal wells mainly include numerical simulation and analytical method. Numerical simulation can better simulate the dynamic process of steam huff and puff production, but this method is cumbersome, time-consuming, and poor in practicability; However, there are few analytical methods for studying and predicting the steam huff and puff productivity of horizontal wells, and the existing analytical methods are immature due to the complex mechanis...

AI Technical Summary

Problems solved by technology

At present, the methods for predicting and analyzing steam huff and puff productivity of horizontal wells mainly include numerical simulation and analytical method. Numerical simulation can better simulate the dynamic process of steam huff and puff production, but this method is cumbersome, time-consuming, and poor in practicability; However, there are few analytical methods for studying and predicting the steam huff and puff productivity of horizontal wells, and the existing analytical methods are immature due to the complicated mechanism of steam huff and puff in horizontal wells and the existence of seepage problems in reservoirs.

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