A high-temperature and high-pressure crude oil ignition point test device and test method

Abstract

The invention provides a high-temperature and high-pressure crude oil ignition point testing device and testing method. The high-temperature and high-pressure crude oil ignition point testing device comprises a gas injecting system and a combustion kettle, wherein the gas injecting system is provided with an air storage tank, an electromagnetic valve, a gas booster pump, a high-pressure storage tank and a gas flow controller, wherein the air storage tank is connected with the electromagnetic valve by virtue of a first pipeline, the electromagnetic valve is connected with the gas booster pump by virtue of a second pipeline, the gas booster pump is connected to the gas flow controller by virtue of a third pipeline, the high-pressure storage tank is connected with the third pipeline by virtue of a gas transmitting pipeline; the combustion kettle is provided with a temperature measuring probe capable of detecting a temperature inside the combustion kettle, a wiring terminal of the temperature measuring probe is positioned outside the combustion kettle and connected with the temperature measuring device, a probe end of the temperature measuring probe is positioned in the combustion kettle, the gas flow controller is communicated with an inner cavity of the combustion kettle by virtue of a fourth pipeline, a gas inlet valve is arranged on the fourth pipeline, and a pressure sensor is connected onto the fourth pipeline. The invention further provides a testing method of the high-temperature and high-pressure crude oil ignition point testing device.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and specifically relates to a crude oil ignition test device and testing method under high temperature and high pressure reservoir conditions, which can measure the spontaneous combustion temperature of crude oil ignition under different reservoir pressures, different oil products and different water content conditions, Provide support for realizing the personalized design of single well ignition process. Background technique [0002] Ignition technology of incineration oil layer is one of the key technologies for the success of incineration oil layer. At present, the ignition process mainly uses the oil sample thermogravimetric curve (TGA) and thermogravimetric rate curve (DTG) to determine the ignition temperature, and the determined value of the ignition temperature is relatively high, even reaching 500 °C. However, it was found in the work that the above method mainly has the following ...

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Problems solved by technology

However, it was found in the work that the above method mainly has the following problems: ① The TGA curve reflects that the weight of the sample gradually decreases with the increase of temperature, and the DTG curve shows that the rate of weight loss in different temperature ranges is different. These two curves essentially reflect the combustion of crude oil During the experiment, the gas was circulated, and the gas components produced after the cracking of crude oil under high temperature conditions were also taken away. However, in the process of ignition and fire line advancement under the reservoir conditions, the connection effect of the injection and production wells was not as good as in the experiment. The ideal connection effect is relatively short in the initial stage of fire flooding, especially the instant when the oil layer is ignited. Therefore, it can be considered that the gas flow rate is very small or basically does not flow. Therefore, through the oil sample thermal weight loss curve (TGA), thermal weight loss rate (DTG) curve (DTG) to determine the ignition temperature, which can not simulate the ignition of oil layer conditions; ②TG / DTG but because the sample is very small, generally 2-5mg, the mass flow mechanism cannot be accurately simulated; ③The heating rate is usually set at 10°C / min, which is too fast It affects the occurrence of liquid phase composition changes quickly, and the data obtained from the experiment differs greatly from the data under field conditions; ④ Different people conduct experiments, and the experimental results obtained vary greatly

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