Gas reservoir sand control screen dynamic corrosion simulation device, simulation method and evaluation method

Abstract

The invention relates to a dynamic corrosion simulation device for sand control screens in gas reservoirs, a simulation method and a method for evaluating the dynamic corrosion performance of sand control screens. The simulation device includes a screen corrosion simulation module, a high-pressure gas pumping module, and an exhaust module; the high-pressure gas The outlet of the pumping module is connected to the gas inlet of the screen corrosion simulation module, and the exhaust module is connected to the gas outlet of the screen corrosion simulation module; the screen corrosion simulation module includes a simulated wellbore provided with a manhole cover , sand control screen, electric heating jacket and temperature controller, and the sand control screen is located in the simulated wellbore. The device of the present invention comprehensively and systematically simulates the dynamic corrosion of sand control screens under dynamic flow conditions, and simulates the elements of high pressure, high temperature, partial pressure of corrosive gas, flow rate of corrosive gas, flow rate of liquid and impact of sand grains, and can better simulate Actual dynamic flow in oil and gas unconsolidated sandstone reservoirs and gas hydrate reservoirs.

Description

technical field [0001] The invention relates to a dynamic corrosion simulation device, a simulation method and an evaluation method of a sand control screen pipe in a gas reservoir, and belongs to the technical field of sand control screen pipe testing. Background technique [0002] Among the conventional oil and natural gas reservoirs in my country and the world, more than 70% are weakly cemented unconsolidated sandstone reservoirs, and sand production is serious during the mining process. The so-called sand production means that during the exploitation of oil and natural gas unconsolidated sandstone reservoirs and natural gas hydrate reservoirs, due to reasons such as excessive production pressure difference and loose cementation of sandstone oil and gas layers, formation sand grains are produced into the wellbore or phenomena on the ground. Sand control is currently the main way to solve the sand production problem. No matter what kind of sand control system is adopted, ...

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Problems solved by technology

[0004] There are also some simulation devices for simulating the corrosion of sand control screens for high temperature and high pressure gas reservoirs and harsh downhole corrosion environments, but the existing devices have the following problems: 1) The existing corrosion simulation devices are all aimed at different metal materials, using metal The corrosion test evaluation of the hanging piece cannot be carried out for the corrosion test of the mechanical sand control screen, which is a special and complex structure, and the quantitative test of the corrosion law of the different components of the screen inner base pipe, sand retaining medium, and outer protective cover cannot be realized;

[0005] 2) The existing corrosion simulation device can only perform static corrosion, that is, the pre-filled gas components are in the simulation device, and the reactor is sealed for static corrosion

During the simulation process, there is no gas supply, and the corrosive components in the gas gradually decrease, which does not conform to the actual situation of the continuous supply of corrosive components in the actual natural gas well, that is, the dynamic flow conditions of the gas dynamic flow during the actual gas reservoir development cannot be realized. Corrosion Simulation

[0006] 3) Even if there is an experimental device that can simulate the dynamic corrosion of sand control screens under dynamic flow conditions, it is only a simulation experiment for one type of sand control screen, and it is impossible to simulate sand control screens in different situations;

[0007] 4) There are many main factors leading to corrosion failure of screen pipes, such as temperature, corrosive gas partial pressure, corrosive gas flow rate, liquid composition, liquid flow rate, and more importantly, sand impact. The current simulation device can only target two of them or three factors to simulate, it is impossible to fully and systematically simulate the dynamic corrosion of sand control screens under dynamic flow conditions, so that the results obtained in the experiment are far from the results obtained in the actual situation, and are not convincing

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