A method for determining the effective construction radius of chemical viscosity reduction in gas-bearing heavy oil reservoirs

Abstract

The invention relates to a determining method of an effective construction radius of chemical viscosity reduction of a heavy oil reservoir containing gas. The method comprises the following steps that (1) whether an oil well needs to be constructed and has the construction value or not is judged; (2) after it is determined that the oil well needs to be constructed and has the construction value, related calculation parameters are collected; (3) a pressure reduction curve is obtained according to a pressure reduction formula formed by oil well production, and the pushing function of formation pressure on underground crude oil under different radius position conditions is determined; and (4) the obtained radius is calculated under the critical condition after the crude oil is degassed when lower than the saturation pressure, namely the obtained radius is the effective construction radius of chemical viscosity reduction of the heavy oil reservoir containing gas. The technical aim of the determining method is to enrich the construction modes of chemical cold production viscosity reduction of the heavy oil reservoir, the effective construction radius of chemical viscosity reduction of a single well is rapidly determined for the heavy oil reservoir containing gas, and a rapid and convenience guidance is provided for construction of field chemical viscosity reduction.

Description

technical field [0001] The invention relates to the technical field of petroleum processing, in particular to a method for determining the effective construction radius of chemical viscosity reduction in gas-bearing heavy oil reservoirs. Background technique [0002] Of my country's proven oil reserves, ordinary heavy oil accounts for 74.7%, extra heavy oil accounts for 14.4%, and super heavy oil accounts for 10.9%. For abundant heavy oil resources, thermal recovery is the main method (steam flooding and steam stimulation are the main means), but steam flooding or steam stimulation will consume a large amount of fuel and a large amount of thin oil, which will eventually increase the The cost of oil recovery, especially for some oil reservoirs with poor physical properties, where faults are developed, the oil layers are thin, and the connectivity is poor. Large-scale steam flooding and other thermal recovery methods are difficult to be effective, or the effect is poor, result...

AI Technical Summary

Problems solved by technology

But for construction means and method, Chen Xingjia (a kind of chemical viscosity reduction method for crude oil, patent No. CN103046913A), Wu Guanghuan et al. Emulsification viscosity reduction method, publication number CN104963667A) describes different construction methods of chemical viscosity reduction, generally introduces how to construct and how the construction effect is, and rarely introduces specific construction parameters

In the construction measures of viscosity reduction in heavy oil cold recovery, at present, only the injection rate has an empirical formula. The determination of the viscosity reduction radius is obtained through indoor simulation experiments or numerical simulations to obtain relevant parameters. There is no method to theoretically Guidance and determination of construction radius

However, the construction plan determined through cumbersome simulations and experiments is not only time-consuming and laborious, but also difficult to apply to large-scale cold oil production.

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