CPC E21B 47/006 (2020.05) [E21B 43/20 (2013.01); E21B 47/06 (2013.01); G01N 11/00 (2013.01); G01N 13/00 (2013.01); G01N 15/0826 (2013.01); E21B 2200/20 (2020.05); G01N 2011/0093 (2013.01); G01N 2013/003 (2013.01)] | 17 Claims |
1. A method for determining a damage extent of a reservoir, comprising:
drilling a well to be diagnosed to the reservoir;
applying a pressure to drive a fluid containing flowing particles to continuously intrude from a wellbore of the well to be diagnosed into the reservoir;
determining a characteristic parameter characterizing reservoir damage by each of a plurality of factors based on a spatio-temporal evolution simulation equation of reservoir damage by each of the plurality of factors, wherein the reservoir is located in a preset region of the well to be diagnosed; and
determining an effective characteristic parameter characterizing the damage extent of the reservoir based on the characteristic parameter characterizing reservoir damage by each of the plurality of factors,
wherein the well to be diagnosed is a water injection well, a polymer injection well or an oil production well, the plurality of factors comprise extraneous solid-phase particles, the method further comprising:
when the well to be diagnosed is in a drilling stage, determining a spatio-temporal evolution simulation equation of reservoir damage by the extraneous solid-phase particles by the following modeling process:
determining a velocity of the fluid containing flowing particles in the reservoir;
establishing a mass balance equation between the fluid and deposited particles on rock in the reservoir, based on a convection parameter and a diffusion parameter of the fluid;
establishing a connection condition equation between a volume concentration of the deposited particles and a volume concentration of the fluid, based on the convection parameter and the diffusion parameter of the fluid; and
determining the spatio-temporal evolution simulation equation of reservoir damage by the particles according to a relationship between a mass fraction of the flowing particles and a volume concentration of the flowing particles, the velocity of the fluid, the mass balance equation and the connection condition equation, wherein the spatio-temporal evolution simulation equation is used to simulate a four-dimensional spatio-temporal evolution process of characteristics of reservoir damage caused by the extraneous solid-phase particles.
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