An experimental device for testing steam condensation law under heavy oil reservoir conditions, its working method and application

Abstract

The invention discloses an experimental device for testing the law of stream condensation in heavy oil reservoir conditions. The experimental device comprises a steam generation filling pipeline, a filling pipeline for auxiliary production fluid and a condensation chamber; the steam generation filling pipeline and the filling pipeline for the auxiliary production fluid are respectively connected with the condensation chamber; the steam generation filling pipeline and the filling pipeline for the auxiliary production fluid are parallelly connected into the filling pipeline to be connected withthe condensation chamber; an experimental core with saturated formation water and heavy oil is arranged on the condensation installation wall. The experimental core is controlled by the interference of external temperature on the condensing mounting wall, which is consistent with the simulated actual formation core temperature; meanwhile, the temperature and pressure in a condensing chamber are controlled to stimulate real environmental conditions and parameters in actual strata; finally according to requirements of experimental research, steam is injected into the condensing chamber alone ormixed with steam and one or more auxiliary production fluids, and a variety of experimental comparison of technical results is achieved.

Description

technical field [0001] The invention relates to an experimental device for testing the law of steam condensation under heavy oil reservoir conditions, its working method and application, and belongs to the technical field of thermal recovery and development of heavy oil reservoirs. Background technique [0002] Heavy oil is crude oil with high asphaltene and colloid content and high viscosity. The viscosity of degassed crude oil is greater than 100mPa.s at the original reservoir temperature. my country's heavy oil resources are widely distributed. Onshore heavy oil resources account for more than 20% of the total oil resources. The proven geological resources are 7.98 billion tons, and the annual output exceeds 28 million tons, accounting for 14% of domestic crude oil production. An important part of my country's crude oil production. Further increasing heavy oil production is an important guarantee for maintaining the stability of China's oil production and maintaining nati...

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Problems solved by technology

Heavy oil reservoir characteristics, steam injection development methods, additives and other factors will affect the steam condensation law, so there is no experimental device to test the steam condensation law under heavy oil reservoir conditions

[0005] In "Special Oil and Gas Reservoirs" 2018, Wang Yiping published an article "Nitrogen-Assisted Steam Flooding Enhanced Heat Transfer Mechanism and Causes". Condensation heat transfer in oil reservoirs is more complicated. First, the solid surface contacted by steam is core sand grains. Sand grains are composed of rock minerals, and their heat transfer characteristics are quite different from those of brass blocks. In addition, there are porous media between sand grains. Fluids such as saturated heavy oil and formation water in porous media are also quite different from brass blocks, and the pressure and temperature are relatively high under reservoir conditions. The experimental devices and methods in "Discussion on the Cause of Formation" are difficult to be used to test the law of steam condensation under the conditions of heavy oil reservoirs

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