Carbonate reservoir corrosion process simulation test device

Abstract

The invention discloses a carbonate reservoir corrosion process simulation test device. The device comprises a reaction kettle, a stirring deice, a gas supply device and a data acquisition instrument, wherein the reaction kettle comprises a kettle body and a kettle cover, and a heat-conducting medium inlet and a heat-conducting medium outlet are formed in a jacket on the periphery of the kettle body; an electrical heater and a first temperature measuring probe are further arranged in the jacket; a gas inlet, a gas outlet, a water outlet, an emptying pipe and a second temperature measuring probe are arranged on the kettle cover; the stirring device comprises a motor, a magnetic driver, a stirring shaft and a stirring blade, the magnetic driver is arranged on the kettle cover, a drive shaft of the magnetic driver is connected with one end of the stirring shaft, an output shaft of the motor is coaxially connected with an outer magnet rotor of the magnetic driver, the stirring blade is fixedly connected to the other end of the stirring shaft, and a plurality of objective tables are arranged on the stirring shaft; the data acquisition instrument comprises a temperature sensor and a rotating speed sensor; the first temperature measuring probe and the second temperature measuring probe are electrically connected with the temperature sensor, and a speed measuring probe is electrically connected with the rotating speed sensor.

Description

technical field [0001] The present invention relates to a dissolution test simulation device, in particular to a method for simulating the dissolution process of carbonate rock reservoirs in sedimentary basin oil and gas fields under different hydrochemical characteristics, different temperatures, different pressures and different hydrodynamic conditions test device. Background technique [0002] Marine carbonate rock karst reservoirs are a world-class problem. So far, 279 carbonate rock reservoirs have been discovered in the world, with reserves accounting for about 50% of the total oil and gas resources and production accounting for more than 60%. The Middle and Lower Ordovician carbonate strata in my country are the main horizons where paleokarst is developed and marine fracture-cavity reservoirs are distributed. Therefore, mastering the dissolution mechanism of carbonate rocks is of great significance to the prediction of karst reservoirs. [0003] Carbonate reservoirs...

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Problems solved by technology

However, the temperature of the device of this invention is still changing below 25°C; the pressure in the cavity is changed only by increasing the water pressure of the high-pressure pump, which is the two environmental states of liquid and solid. However, the karstification of oil and gas reservoirs is a long geological period of dissolution process. , since there is no external CO 2 and other acid gases, as the reaction proceeds H + The concentration decreases; and the environmental karst water is in a static state, which cannot meet the fluidity conditions of karst water; while the actual oil and gas field basin Ordovician deep karst water-rock interaction environment temperature can reach 150-200 °C, and the aqueous solution has a certain flow nature, is a gas-liquid-solid three-phase environment, that is, CO 2 -H 2 O-CaCO 3

Therefore, the device described in the above invention is not suitable for applying to the research on the dissolution mechanism of carbonate rock reservoirs in the deep part of sedimentary basins.

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