Method and device for generating water drive characteristic relationship chart

Abstract

The invention provides a water flooding characteristic relation chart generation method and apparatus. The water flooding characteristic relation chart generation method comprises: obtaining oil viscosity, water viscosity, moisture content of oil reservoir produced fluid, residual oil saturation, bound water saturation and original-state oil saturation; according to the oil viscosity, the water viscosity and the residual oil saturation, establishing a relational expression of the moisture content of the oil reservoir produced fluid; according to a Buckley-Leverett water flooding displacement theory and a Welge equation, calculating expressions of water saturation and average water saturation at an outlet end; performing differential operation on the moisture content of the oil reservoir produced fluid to obtain a differential equation; calculating a general solution formula of a relation between the moisture content of a water flooding reservoir and the degree of reserve recovery; and calculating the value of the relation between the moisture content of the oil reservoir produced fluid and the degree of reserve recovery according to the general solution formula, and drawing a water flooding characteristic relation chart according to the value of the relation.

Description

technical field [0001] The invention relates to an oil reservoir exploitation engineering method for oil field development, in particular to a method and a device for generating a water drive characteristic relationship diagram. Background technique [0002] The water drive curve is the characteristic curve of the water drive reservoir. Using the water drive curve can not only predict the development performance of the water drive reservoir, but also predict the recoverable reserves and recovery rate of the water drive reservoir. It has been widely used at home and abroad. Evaluation of water flooding development effect in water flooding oilfield. In the prior art, there are many methods for calculating the relationship between water cut and recovery degree, examples are as follows: [0003] 1) Welge H J.A simplified method for computing oil recovery by gas or water drive [J]. Trans., AIME, 1952, 195:91-98. [0004] Based on Darcy's law and the principle of material conser...

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Problems solved by technology

[0017] There are two main problems in the existing graphs of the relationship between water cut and recovery degree. One is that the water flooding characteristic curve does not reflect the recovery degree of crude oil in the water-free oil recovery period or the water cut is only applicable when it reaches a certain value. This contradicts that the water drive curve is an inherent characteristic curve of water drive reservoirs; the second is to artificially modify the coefficient 7.5 or 1.96 in Tong’s water drive characteristic relation (2) to other constants to meet the actual water drive in the target research area. Third, in the theoretical derivation of the water drive relationship, more empirical values ​​or approximate values ​​are considered, and the fitting degree to the actual oilfield is poor, and the water drive development of the oilfield cannot be reasonably analyzed. Features and Effects

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