Quantitative analysis method for productivity influence factors of horizontal well in open hole completion mode

Abstract

The invention discloses a quantitative analysis method for productivity influence factors of a horizontal well in an open hole completion mode, which comprises the following steps of: 1, constructinga productivity model; 2, constructing a liquid-solid two-phase wellbore flow model; 3, coupling the liquid-solid two-phase wellbore flow model and the productivity model through a coupling relationship to obtain a horizontal wellbore liquid-solid two-phase variable mass flow model; and 4, collecting oil well related parameters, solving the liquid-solid two-phase change mass flow model of the horizontal wellbore by using an iterative method, and performing sensitivity calculation analysis on the wellbore size, the crude oil physical property and the sand particle size. Stratum characteristics of the horizontal well section are fully analyzed; according to the method, the wellbore flow model and the productivity model are coupled by using the inherent existing relationship as the coupling relationship, and the influence proportion of the influence factors on the productivity is calculated through sensitivity, so that the purpose of quantitative analysis is achieved, data support is provided for subsequent productivity simulation prediction, exploitation measure formulation and the like, and the method has high subject construction value.

Description

technical field [0001] The invention relates to the field of reservoir productivity evaluation methods, in particular to a quantitative analysis method for factors affecting productivity of horizontal wells in an open-hole well completion mode. Background technique [0002] The pressure drop in the horizontal wellbore is a non-negligible factor in the calculation of the steady-state productivity of the horizontal well. Therefore, when calculating the horizontal well productivity, the coupling analysis and calculation of the horizontal wellbore and the reservoir should be fully performed to make the coupling more realistic. At present, the mainstream academics are mainly divided into four categories, namely, wellbore-steady-state (pseudo-steady-state) productivity index coupling, wellbore-reservoir inflow semi-analytical model coupling, wellbore processing as porous media-reservoir numerical simulation Coupling, wellbore-reservoir coupling at the wellbore through iterative nu...

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Problems solved by technology

[0002] The pressure drop in the horizontal wellbore is a non-negligible factor in the calculation of the steady-state productivity of the horizontal well. Therefore, when calculating the horizontal well productivity, the coupling analysis and calculation of the horizontal wellbore and the reservoir should be fully performed to make the coupling more realistic. Environment, currently, mainstream academics are mainly divided into four categories, namely, wellbore-steady-state (pseudo-steady-state) productivity index coupling, wellbore-reservoir inflow semi-analytical model coupling, wellbore processing as porous media-reservoir numerical simulation Coupling, wellbore-reservoir coupling at the wellbore through iterative numerical simulation. However, when the above coupling is used for productivity analysis, it can only achieve qualitative analysis. The diameter of sand particles will affect the production of sandy crude oil, making it impossible to quantitatively evaluate and analyze these influencing factors, and it is difficult to restore the real bottom hole situation, and it is impossible to predict the production capacity or provide real and reliable information for the formulation of post-production processes. Data support, etc.

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