Method for controlling wettability of artificial conglomerate core

Abstract

The invention relates to a method for controlling wettability of an artificial conglomerate core. The method includes a water wet control method and an oil wet control method. In the water wet control process, a water-soluble nonionic surfactant OP-10 is added into a curing agent, the addition amount is controlled so that wettability of the artificial conglomerate core can be converted into hydrophily from neutral partial lipophilicity, and the wettability of the artificial conglomerate core is controlled. In the oil wet control process, quartz sand at different grades is mixed and treated with silicone oil, and the manufactured artificial conglomerate core has weak lipophilicity through a series of operation such as stirring, volatilizing and drying. The method for controlling the wettability of the artificial conglomerate core is easy to operate, low in cost, high in efficiency, stability and adsorbability and high in wettability control accuracy, the manufactured artificial conglomerate core approximates a natural rock core and is suitable for indoor flooding oil physical simulation experiments in the petroleum industry, and simulation results are more real and reliable and meet practical situations better.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and in particular relates to a method for controlling the wettability of artificial sandstone cores. Background technique [0002] The experimental model used in indoor physical simulation is mainly the core model. Due to the complex process, difficulty, and high cost of natural coring, artificial cores are usually used instead of natural cores for indoor physical simulation experiments. Due to the complexity of the genesis of natural cores, when making artificial cores, it is impossible to simulate the complex genesis of natural cores to achieve a heterogeneity close to that of natural cores. In addition, the pore throat structure, surface properties and The wetting property is single and cannot be very close to natural cores. Therefore, artificial cores cannot accurately and effectively replace natural cores for indoor physical simulation research. [0003] The i...

AI Technical Summary

Problems solved by technology

How to approximate the conditions of reservoir rocks with artificial cores from the perspective of wettability is the key link in various comparative experiments, and it is also an important prerequisite for the petroleum industry to use indoor physical simulation technology to study oil displacement mechanisms. There are very few studies on sandstone core wettability control methods, and there are some difficult problems

For water and humidity control, single-phase microemulsions need to be pretreated with surfactants, crosslinking agents, etc. in the process of configuring wetting agents. Degradation; for oil-wet control, the wetting agents polymethyl methacrylate, polystyrene and polyethylene have outstanding advantages in controlling the microscopic glass model, and have a good ability to control the wetting angle, but they are not effective in controlling the artificial sandstone The wettability of the core is unsatisfactory. First, the quartz sand particles adsorb the wetting agent, reducing the effect of the wetting agent. Second, in the process of making artificial sandstone cores, the quartz sand particles and the cement need to be exposed to high temperature. Handling and pressing, however these three wetting agents have very poor stability at high temperatures