Screening method for chemical flooding injection tubing

Abstract

The invention discloses a screening method for chemical flooding injection tubing, and relates to the field of petroleum exploitation. The screening method comprises the following steps that a targetblock is obtained, the relationship between the viscosity coefficient of a polymer solution and the temperature and the relationship between the rheological index and the temperature are prepared forinjection; the temperature field in a wellbore is obtained by calculating the temperature distribution at different positions in the wellbore; the maximum flow velocity of tubing with different pipe diameters is calculated according to the given diurnal injection, the relationship between the rheological index and the temperature and the temperature field in the wellbore, and the tubing which meets flow velocity requirements is screened out; the viscous loss of the tubing with the different pipe diameters is calculated according to the given diurnal injection, the relationship between the rheological index and the temperature and the temperature field in the wellbore; the flow state of fluid under the tubing with the different pipe diameters is obtained according to the given diurnal injection, the temperature field of a target well, the relationship between the viscosity coefficient of the polymer solution and the temperature and the relationship between the rheological index and thetemperature; and the streamwise fiction of the tubing with the different pipe diameters is calculated according to the given diurnal injection and the flow state of the fluid under the tubing with thedifferent pipe diameters.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a screening method for chemical flooding injection oil pipes. Background technique [0002] Chemical flooding technology is the main tertiary oil recovery technology. It is the main means to enhance the recovery rate in the middle and late stages of the development of medium and high permeability water flooding reservoirs. Generally, the recovery rate can be increased by 5%-15% on the basis of water flooding. The chemical flooding production technology is mainly divided into polymer flooding, poly-surface binary compound flooding, poly-surface alkali three-component compound flooding, etc., and the main injection medium generally used is polyacrylamide. The material has the characteristics of degradation when encountering iron ions and shearing at high shear rates, which brings great difficulties to chemical flooding and injection. Therefore, how to reduce the degradation and she...

AI Technical Summary

Problems solved by technology

However, the current selection method of injection tubing is a theoretical method, and the advantages and disadvantages are qualitatively compared through indoor experiments such as pipe hanging pieces, but this method is not suitable for field practice, because the field conditions cannot be simulated in the laboratory; and Another method is to summarize the laws completely through field application. This method requires a large investment and is not scientific, which is not conducive to popularization.

Images