Automatic control system alternatively filled with simulated polymer solution

Abstract

The invention relates to an automatic control system alternatively filled with simulated polymer solution. The automatic control system is characterized by comprising a polymer alternative filling experimental device and an automatic switching control device; a constant-flux pump output end in the polymer alternative filling experimental device is linked with input ends of three middle containers in parallel, and output ends of the three middle containers are connected with an input end of a rock core holding unit; the bottom part of the output end of the core holding unit is provided with a fluid collecting container, and the core holding unit is further connected with a pressure confining pump. High-pressure pneumatic valves in the automatic switching control device are respectively arranged at the input end and the output end of every middle container, and every high-pressure pneumatic valve is connected with an electromagnetic valve group; the working air source of the electromagnetic valve group is provided by the air compressor. A pressure sensor is respectively arranged between every high-pressure pneumatic valve and the output end of the middle container, and the input end of the core holding unit is also provided with a pressure sensor. The signal detected by every pressure sensor is transmitted to a computer through a control box to control. The automatic control system alternatively filled with simulated polymer solution can be widely applied to related experiments for improving oil recovery of chemical flooding in an oilfield.

Description

technical field [0001] The invention belongs to the field of oilfield chemical flooding, in particular to an automatic control system for simulating alternate injection of polymer solutions. Background technique [0002] Polymer flooding, as an important technical means to "stabilize oil and control water" in the middle and late stages of oilfield development, has attracted more and more attention from scientific researchers. The development practice of oilfield polymer flooding shows that in the process of polymer flooding, there will be practical problems such as low production degree of low permeability layers, injection difficulties in some polymer flooding blocks, and excessive polymer consumption. Technically, it affects the sweep efficiency of polymer flooding, thereby affecting the effect of the entire recovery; economically, too much polymer input increases the cost of chemicals. The main method to solve this problem is to inject polymer slugs with different viscos...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the commonly used polymer alternate injection experimental device for polymer flooding alternate injection: in the process of physical simulation, due to the need to inject different media or polymer solutions with different concentrations in the same When displacing the medium in the container, it is necessary to manually switch the control valve, and manual switching will inevitably cause data fluctuations, and the error is relatively large

When alternately injecting displacement media in different intermediate containers, it is necessary to manually switch the control valve, and manual switching will inevitably cause data fluctuations and relatively large errors

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