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A method for predicting steady-state productivity of vertical wells in asphaltene precipitation reservoir

A productivity prediction and asphaltene technology, applied in prediction, instrument, data processing and other directions, can solve the problem of failure to consider the influence of asphaltene precipitation steady-state productivity, the difficulty in predicting the steady-state productivity of vertical wells in oil reservoirs, and the impact on reservoir rocks. Seepage capacity and fluid properties

Active Publication Date: 2019-01-11
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0002] During the development of some oilfields, changes in temperature and pressure will lead to asphaltene precipitation, which will affect the seepage capacity and fluid properties of reservoir rocks, making it difficult to predict the steady-state productivity of vertical wells in this type of reservoir
[0003] At present, some experts and scholars have used methods such as solving the seepage differential equation or the superposition principle of potentials to predict the steady-state productivity of vertical wells for conventional homogeneous reservoirs, but they have failed to consider the influence of asphaltene precipitation on the steady-state productivity during oilfield development. There is still room for improvement in prediction accuracy

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  • A method for predicting steady-state productivity of vertical wells in asphaltene precipitation reservoir
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  • A method for predicting steady-state productivity of vertical wells in asphaltene precipitation reservoir

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[0045] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0046] The invention provides a method for predicting the steady-state production capacity of vertical wells in asphaltene-deposited reservoirs, the method comprising the following steps:

[0047] 1) if figure 1 , figure 2 As shown, according to the laboratory test results of typical formation crude oil samples, the mass fraction of dissolved asphaltene in crude oil can be divided into four stages with the change of formation pressure:

[0048] The first stage is that the formation pressure changes from the original formation pressure P i Down to the upper limit of precipitation pressure P u When , the dissolved asphaltenes in crude oil remain stable with a constan...

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Abstract

A method for predicting steady-state productivity of vertical wells in asphaltene precipitation reservoir includes such steps as: dividing the mass fraction of asphaltene dissolved in crude oil into four stages according to the test results of typical formation crude oil samples in laboratory; according to the laboratory test results, establishing the mathematical expressions of asphaltene precipitation law for four stages of asphaltene isothermal precipitation; based on the classical power-law and exponential pore-permeability relations and the mathematical expression of asphaltene precipitation law, establishing the prediction model of reservoir rock percolation capacity. A mathematical model of isothermal steady percolation in vertical wells of asphaltene precipitation reservoir is established and solved according to the power law pore-permeability relation. The mathematical model of isothermal steady percolation in vertical wells of asphaltene precipitation reservoir is established. Based on the exponential porosity-permeability relationship, a mathematical model of isothermal steady percolation in vertical wells of asphaltene precipitation reservoirs is established and solved.The invention realizes the steady-state productivity prediction of the reservoir vertical well on the basis of considering the influence of asphaltene precipitation on the reservoir percolation ability and the fluid property.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for predicting steady-state productivity of vertical wells in asphaltene-precipitated reservoirs. Background technique [0002] During the development of some oilfields, changes in temperature and pressure will lead to asphaltene precipitation, which will affect the seepage capacity and fluid properties of reservoir rocks, making it difficult to predict the steady-state productivity of vertical wells in this type of reservoir. [0003] At present, some experts and scholars have used methods such as solving the seepage differential equation or the superposition principle of potentials to predict the steady-state productivity of vertical wells for conventional homogeneous reservoirs, but they have failed to consider the influence of asphaltene precipitation on the steady-state productivity during oilfield development. There is still room for improvement in pre...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 李长勇唐莎莎杨莉邱凌张迎春皮建杨仁锋蒋百召刘广为康博韬唐嘉伟李竞
Owner CHINA NAT OFFSHORE OIL CORP
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