Prediction method of steam injection parameters based on the principle of three parameters

Abstract

The present invention provides a steam injection parameter prediction method based on the principle of three parameters, including: step 1, collecting reservoir parameters and steam injection parameters; step 2, setting the steam injection pressure difference ΔPz* of the oil layer; step 3, calculating The steam injection pressure from the wellhead to the bottom of the well, that is, the bottom steam injection pressure P ws ;Calculate the dryness of steam at the wellhead x 0 and bottom hole steam injection dryness Xw; calculate oil layer steam injection pressure difference ΔPz; judge calculated oil layer steam injection pressure difference ΔP z The steam injection pressure difference △P z *The error δ; when the error δ≤1%, output the steam parameters of wellhead and bottom. The steam injection parameter prediction method based on the three-parameter principle is based on the three-parameter principle, and introduces the concept and calculation method of reservoir steam injection pressure difference. By establishing the balance between the reservoir steam suction pressure and the bottom hole steam injection pressure, the The coupling between wellhead steam injection parameters and reservoir steam absorption capacity is studied.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a steam injection parameter prediction method based on the principle of three parameters. Background technique [0002] Wellbore steam injection parameter calculation software currently in use, given wellhead steam injection parameters, including steam injection speed, steam injection pressure (steam injection temperature), steam injection dryness, according to the given wellbore trajectory and steam injection string structure , to calculate the corresponding bottom-hole steam injection parameters, including bottom-hole steam injection pressure (steam injection temperature) and steam injection dryness. In the calculation method, the Beggs-Brill method is used to deal with the gas-liquid two-phase flow of wet saturated steam, which can fully consider the characteristics of the two-phase flow, and the calculation accuracy of the pressure loss along the pipe flow is hig...

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Problems solved by technology

The current steam injection parameter optimization calculation method does not consider reservoir parameters, ignores the pressure balance relationship between wellhead, wellbore and reservoir, and reflects that the steam injection capacity determines the steam absorption capacity of the reservoir, which is not in line with the actual situation on site of

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