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
CN109190842AActive Publication Date: 2019-01-11CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2019-01-11

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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.
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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...

Claims

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