Novel ionic liquid based complex structural well seepage electric simulation system

Abstract

The invention provides a novel ionic liquid based complex structural well seepage electric simulation system which comprises a power supply, an ampere meter, a voltmeter, a large-scale data acquisition instrument, a probe and an electrolyte tank and can simulate a three-dimensional seepage law. Ionic liquid is used to replace the traditional electrolyte for the first time, is wide in electrochemical window and larger in viscosity, and thus the influence of electrolyte electrolytic reaction on the electric field stability is eliminated basically; compared with the traditional salt solution, the ionic liquid is more sensitive to voltage change and can carry out rapid mechanical automatic measurement without losing the accuracy; the change rate of solution electrical conductivity along with voltage is improved, so that a measured delta U-I curve more approaches an ideal line, and an experiment error is greatly reduced; and the electrical conductivity of the ionic liquid is more difficult to change when influenced by temperature change. According to the technical scheme, data measurement and collection automation of a water and electric simulation experiment is realized, the experiment accuracy is improved, and the measurement time is reduced; and certain kinds of simulation structural drawings of novel complex structural wells are also given.

Description

technical field [0001] The invention relates to oil and gas seepage technology, belongs to the field of oil and gas field development, and particularly relates to an electrical simulation system suitable for the study of seepage law in complex structured wells. Background technique [0002] At present, the experimental research methods of reservoir seepage mechanism are mainly divided into two types: core experiment and hydropower simulation experiment. The core test can be carried out with actual reservoir cores, which are closer to the actual geological conditions, and can directly measure the more accurate changes in production, pressure, water content, etc. Generally longer and more expensive. The hydropower simulation experiment is a simulation experiment device developed based on the principle of hydropower similarity. It can process and make various complex wellbore and fracture models arbitrarily, and the experiment period is short and the cost is low. As oilfield ...

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Problems solved by technology

The purpose of the present invention is to provide a new electrical simulation system for the seepage law of complex wells, so as to solve the following problems in the prior art: first, the existing electrical simulation devices mainly use aqueous solutions such as NaCl as electrolytes, and the electrochemical window Generally, it is 1~2V. When using this kind of electrolyte to simulate wells with complex structures, the measurement voltage is high, the measurement time is long (generally two hours), and the contact area between the copper mesh electrode and the electrolyte solution for simulating multi-stage complex fractures is relatively large. , the continuous electrochemical reaction between the copper mesh electrode and the electrolyte solution leads to the instability of the entire simulated electric field, and the poor measurement accuracy of current and voltage, which has a great impact on the distribution regularity of the measured isobars, which cannot meet the requirements of the study of seepage mechanism. need

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