Simulation device and method for dynamic corrosion of gas reservoir sand-proof screen pipe and evaluation method for dynamic corrosion performance of sand-proof screen pipe

Abstract

The invention relates to a simulation device and method for dynamic corrosion of a gas reservoir sand-proof screen pipe and an evaluation method for dynamic corrosion performance of a sand-proof screen pipe. The simulation device comprises a screen pipe corrosion simulation module, a high-pressure gas pumping module and an exhaust module; an outlet of the high-pressure gas pumping module is connected to a gas inlet of the screen pipe corrosion simulation module, and the exhaust module is connected to a gas outlet of the screen pipe corrosion simulation module; and the screen pipe corrosion simulation module comprises a simulation shaft which is provided with a well lid, a sand-proof screen pipe, an electric heating sleeve and a temperature controller, wherein the sand-proof screen pipe ispositioned in the simulation shaft. According to the device and method, the dynamic corrosion condition of the sand-proof screen pipe under the dynamic flowing condition is simulated, elements such ashigh-pressure, high-temperature, corrosive gas partial pressure, corrosion gas flow velocity, liquid flow rate and sand grain impact are simulated, and the actual dynamic flowing conditions of the petroleum and natural gas loose sandstone reservoir and the natural gas hydrate reservoir can be better simulated.

Description

technical field [0001] The invention relates to a dynamic corrosion simulation device for a sand control screen of a gas reservoir, a simulation method and a method for evaluating the dynamic corrosion performance of a sand control screen, and belongs to the technical field of sand control screen 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 oil and gas 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...

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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 corrosion environments downhole, 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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