Method for quantitatively evaluating thermal recovery reservoir steam thermal leading edge balance based on Gini coefficient

Abstract

The invention provides a method for quantitatively evaluating the steam thermal front edge balance of a thermal oil recovery reservoir based on a Gini coefficient. The method comprises the steps thata steam injection development temperature field is calculated through numerical simulation of the thermal oil recovery reservoir; taking the temperature higher than the initial oil reservoir temperature as a steam hot leading edge boundary, and drawing the boundary in a temperature field diagram; sequentially reading the grid coordinates of the steam injection well and the numerical simulation grid coordinates passed by the boundary of the steam hot leading edge; sequentially calculating the distances between the steam injection well and the boundary coordinates of the steam hot front edge according to a formula of the distance between the two planar points; solving the minimum distance between the steam injection well and the boundary of the steam hot leading edge; solving the distance between the circular boundary and the steam hot leading edge boundary respectively; drawing a Lorentz curve of the distance between the circular boundary and the hot leading edge boundary; solving a Gini coefficient G; according to the method for quantitatively evaluating the steam thermal front edge balance of the thermal oil reservoir based on the Gini coefficient, the defects of traditional qualitative evaluation of the steam thermal front edge can be effectively overcome, and quantitative evaluation of the steam thermal front edge balance is achieved.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for quantitatively evaluating the steam heat front balance of a thermal recovery oil reservoir based on the Gini coefficient. Background technique [0002] Since the "Tenth Five-Year Plan", through technical research, Shengli Oilfield has formed supporting development technologies such as heavy oil encryption huff and puff, ultra-super heavy oil, sensitive heavy oil, thermochemical huff and puff, thin layer, bottom water, shallow super heavy oil and heavy oil , and constantly strengthened the potential of old areas and investment in new areas, and achieved a substantial increase in Shengli's heavy oil production. As of the end of 2017, the heavy oil output of Shengli Oilfield reached 4.45 million tons, accounting for 19.1% of the total output of Shengli Oilfield. [0003] With the increase of production rounds, the effect of steam huff and puff gradually d...

AI Technical Summary

Problems solved by technology

In the past, quantitative evaluation of steam sweeping conditions was seldom carried out, only qualitative analysis, especially the sweeping balance of the thermal front lacked a suitable quantitative evaluation method

Images