Laboratory experiment device and method for profile control with same

Abstract

The invention provides a laboratory experiment device and a method for profile control with the same. The problem that the position, the size and the like of a high-permeability belt formed in the polymer flooding process cannot be judged through existing laboratory experiments is solved. The method particularly includes the steps that a pressure measuring and injection-production integrated instrument is invented and arranged on a two-dimensional planar well network heterogeneous core model; a one-dimensional core is used for finding out the relation between the pore volume of the high-permeability belt and the pressure gradient, pressure values of all pressure measuring points are measured through the pressure measuring and injection-production integrated instrument, and pressure gradients between all the points are calculated; the relation between the pressure gradient and the pore volume of the high-permeability belt is found out, and the pore volume of the high-permeability belt is determined according to the relation, and then a profile control agent with the same pore volume as the high-permeability belt is injected through the pressure measuring and injection-production integrated instrument to complete profile control. By means of the laboratory experiment device, the position of the high-permeability belt can be accurately positioned, profile control can be carried out on the high-permeability belt, the laboratory profile control process is closer to on-site actual conditions, and the device and technological support are provided for laboratory study on profile control technologies.

Description

technical field [0001] The invention relates to a device and method for profile control in the field of oil and gas field development, in particular to a device and method for precise profile control of high-permeability strips during indoor experiments of polymer flooding. Background technique [0002] At present, polymer flooding has been applied on a large scale in various oil fields, and a good oil displacement effect has been achieved in the early stage. However, with the increase of production time, the effect of polymer flooding began to gradually deteriorate, and some areas even produced ineffective circulation, that is, the injection of a large amount of polymers has very little or no recovery of the remaining oil. The fundamental reason is that after many years of polymer flooding development, high-permeability strips have generally developed, leading to more prominent contradictions between layers and layers, causing the displacement fluid to rush into the high-pe...

AI Technical Summary

Problems solved by technology

[0004] In terms of laboratory experiments, due to the limitation of models and methods, the existing technical means of laboratory experiments are still unable to judge the basic parameters such as the position and size of the hyperpermeable strips formed in the process of polymer flooding. Precise profile control of high-permeability strips can only use general profile control technology, which makes the indoor experiment poorly simulated to the actual mine field, and the experimental results obtained are also quite different, so it is impossible to give accurate guidance and help on site

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