A method for graded injection-production deployment of sagd development

Abstract

The invention relates to a SAGD (Steam Assisted Gravity Drainage) development and staged injection-production allocation method. The method comprises the following steps: 1) performing first staging and classification on all production wells in a production area according to a cumulative steam-oil ratio (cSOR); 2) counting the sum of the single-well remaining reserves in each stage as the basis offirst steam distribution, and calculating the steam distribution of each stage; 3) sequencing the single-well remaining reserves in each stage from large to small, and performing second staging and classification based on the single-well average remaining reserves of all wells in the production area; 4) calculating the steam distribution of each class; 5) sequencing from large to small accordingto subcool, performing third staging and classification according to subcool larger than 0 and subcool less than or equal to 0, namely, subdividing each class into two sub-classes, and calculating thesub-class steam distribution; 6) performing normalization processing on the cSOR of each sub-class, the single-well remaining reserves and the subcool; 7) introducing a comprehensive steam distribution factor, and calculating the comprehensive steam distribution factor percentage of each well in order to calculate the single-well steam distribution based on the comprehensive steam distribution factor percentage; 8) calculating single-well liquid production by utilizing single-well steam distribution according to a set production-injection ratio in the whole area.

Description

technical field [0001] The invention relates to a method for staged injection-production allocation for SAGD development, belonging to the technical field of oil and gas field development. Background technique [0002] Steam-assisted gravity drainage (SAGD) of dual-horizontal wells is an important technical means for the development of oil sands and super-heavy oil. Similar to conventional water flooding development, SAGD development also has the problem of injection-production allocation. Different well locations have different remaining reserve potentials and different development effects, so injection-production allocation strategies need to be considered accordingly. The remaining reserves of a single well are an important material basis for characterizing the subsequent development potential of a single well. The remaining reserves of a single well are large, and the potential for further exploitation is great; the remaining reserves of a single well are small, and th...

AI Technical Summary

Problems solved by technology

All three will affect the injection-production allocation of SAGD

Some injection-production allocation methods only consider the influence of single factors such as subcool or cSOR, and lack of comprehensive consideration of multiple factors affecting injection-production allocation parameters

Generally speaking, there is currently no set of injection-production allocation methods and procedures that comprehensively consider the geological potential and development characteristics of injection-production wells

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