A Calculation Method of Increased Oil Volume of SAGD Infill Wells in Oil Sands

Abstract

The invention discloses an oil sand SAGD infilling well oil increment calculating method. The oil sand SAGD infilling well oil increment calculating method comprises the following steps: position parameters of adjacent SAGD well pairs and infilling wells between the adjacent SAGD well pairs are measured; if temperature monitoring wells exist between the well pairs, the included angles, displayed by the temperature monitoring wells, between the connecting lines of the bottoms of steam cavities and two steam injection wells and the horizontal plane are calculated according to temperature monitoring data; if no temperature monitoring well exists between the well pairs, the included angles between the steam cavities and the horizontal plane during infilling are subjected to analogy according to the quality of reservoirs of all the well pairs; according to the quality of the reservoirs on the left and right sides of the infilling wells, the final oil drainage included angles of the left andright sides of the infilling wells are subjected to analogy; according to obtained data, the oil drainage area of the infilling wells in the direction perpendicular to shafts is calculated through aformula; and the infilling wells are equally divided into n sections in the direction of the shafts, and the oil sand SAGD infilling well oil increment is calculated through a formula. The oil sand SAGD infilling well oil increment calculating method provides the basis for infilling well positioning screening and oil field adjusting strategy formulating, is suitable for the field of oil sand SAGDdevelopment and research, and can further be promoted to super heavy oil SAGD development.

Description

technical field [0001] The invention relates to a method for calculating the oil increment of an oil-sand SAGD infill well, belonging to the field of oil-sand SAGD well development. Background technique [0002] In the middle and late stage of oil sands SAGD (steam-assisted gravity drainage technology) development, the infill single-horizontal production wells between adjacent well pairs have a more obvious effect on the increase of SAGD oil production rate and recoverable reserves. Implemented more than 200 single horizontal infill wells. [0003] The prediction of oil increment of infill wells is of great significance to the selection of infill well locations and the formulation of oilfield adjustment strategies. At present, the methods used in the industry include reservoir engineering methods, analog methods and numerical simulation methods. The basis of the analog method is the effect prediction data of infill wells in production. However, the prediction results of dif...

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Problems solved by technology

At present, the methods used in the industry include reservoir engineering methods, analog methods and numerical simulation methods. The basis of the analog method is the effect prediction data of infill wells in production. However, the prediction results of different companies and different methods are quite different, and due to the differences in reservoir conditions , the analogy results are not very pertinent; the numerical simulation process is more complicated, the workload is heavy, and the time is long; the current common reservoir engineering method assumes that the section perpendicular to the well of the infill well drainage area is triangular, but practice shows that the section is closer to the Regular quadrilateral, using triangle approximation calculation, often leads to large calculation results

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