4D quantitative and intelligent diagnosis method and system for spatio-temporal evolution of oil-gas reservoir damage types and extent

A system for determining a damage extent of a reservoir, comprising:

• a drill for drilling a well to be diagnosed to the reservoir;
• a pump for 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;
• a first parameter determination device configured to, based on a spatio-temporal evolution simulation equation of reservoir damage by each of a plurality of factors, determine a characteristic parameter characterizing reservoir damage by each of the plurality of factors, wherein the reservoir is located in a preset region of a well to be diagnosed;
• and
• a second parameter determination device configured to determine 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 system further configured to determine, when the well to be diagnosed is in a drilling stage, 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.