Large liquid measure constant pressure displacement indoor physical simulation experiment device

Abstract

The invention discloses a large liquid measure constant pressure displacement indoor physical simulation experiment device. The large liquid measure constant pressure displacement indoor physical simulation experiment device comprises a first automatic water adding device, a second automatic water adding device, an oil adding device, a first impurity removing device, a second impurity removing device, a pressure collecting device, an oil-water metering device and a rock core clamping device; control devices of the automatic water adding devices are provided with water adding control buttons and displacement control buttons; the automatic water adding devices comprise vacuum pumps. Two sets of the automatic water adding devices are adopted to work alternatively, enough water sources are provided for a large liquid measure constant pressure displacement experiment, and the experiment schedule cannot be influenced; the control devices serve as central systems in the whole process of water adding and displacement; on the one hand, the vacuum pumps provide power for water containers to feed water, on the other hand, dissolved gases of the water are pumped out through vacuum pumping, and therefore the influence of the dissolved gases of the water on the displacement experiment is reduced; the first impurity removing device is used for removing impurities of the water, and the second impurity removing device is used for removing impurities of oil; the oil-water metering device can measure the volume of the oil and water accurately, and errors are reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and relates to a rock core displacement simulation experiment device, in particular to a large liquid constant pressure displacement indoor physical simulation experiment device. Background technique [0002] In the field of oil and gas field development technology, core displacement experiments are usually used to simulate the actual process of crude oil extraction in oil and gas fields. The experiment sometimes needs to inject a large amount of displacement fluid (usually water), and the entire experiment generally needs to be displaced for at least half a month. During the displacement process, the displacement fluid needs to be continuously replenished into the intermediate container, which will greatly increase scientific research The labor intensity of personnel, and affect the progress of the experiment. During the large-volume displacement experiment, the impuritie...

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Problems solved by technology

[0003] Although the existing core displacement devices can simulate indoor displacement experiments, they usually simulate displacement experiments with a small amount of liquid. If a displacement experiment with a large amount of liquid is carried out, the displacement fluid needs to be continuously replenished, and every time When adding displacement liquid, it is necessary to unscrew the cover on the top of the intermediate container, and then tighten the cover after filling up the displacement liquid, which not only increases the work intensity, but also affects the progress of the experiment; in large liquid displacement experiments, impurities and the dissolved gas in the displacement fluid are continuously accumulating, which has a much greater impact on the experimental results than the general displacement experiment. The existing method to solve the problem of sedimentation and scale entering the core is to use a stainless steel intermediate container, or coat the inner wall of the intermediate container with an anti-corrosion layer to prevent the intermediate container from corroding and rusting, but the precipitation and scaling produced by the displacement fluid itself in the container cannot be prevented, which will still cause core blockage

The invention patent with the publication number CN102536180A discloses a rock core displacement device, which can effectively prevent precipitation and scales from entering the rock core, but there are still many defects that cannot solve the problems in the prior art. The pipeline inlet end of the core is wrapped with a filter membrane to remove impurities, but in actual operation, it is impossible to ensure that hard materials such as ceramics and cemented quartz sand described in the patent are fully in contact with the pipeline without relying on simple wrapping. Large gaps are left, so impurities and dissolved gas cannot be effectively removed; the pipeline wrapped with the filter membrane in the device is set at the bottom of the intermediate container, which makes it difficult to replace the filter membrane on the one hand, and on the other hand, when the piston of the intermediate container moves to the bottom When it is in the middle, either the piston is stuck by the pipeline wrapped with the filter membrane, or the pipeline wrapped with the filter membrane is broken, so the operability is very poor

In addition, when carrying out large-volume displacement experiments, it is necessary to accurately measure the volume of oil and water. In the existing technology, test tubes are mostly used for liquid measurement, and the errors generated by each reading continue to accumulate, resulting in large errors in the final results. The entire experiment For at least half a month of displacement, the test tube needs to be replaced continuously, and the workload is very large; in the displacement experiment, when the displacement liquid is added to the intermediate container, it is easy to vibrate, and a large amount of gas dissolves in the liquid. The existing technology does not take measures for this. Any measure, which will greatly affect the experimental results

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