Device for testing influence of hydration heat of cement paste/drilling fluid on stability of natural gas hydrate

Abstract

The invention relates to a device for testing the influence of hydration heat of cement paste/drilling fluid on the stability of natural gas hydrate. The device comprises a gas source 1, a pressure regulating valve 2, a gas mass flow meter 3, a pressure gauge 4, a constant-temperature water tank 6, a water source switch 7, a visual reaction kettle 8, a control panel 13, a computer 16, a heating sleeve 23, pressure sensors 24 and temperature sensors 25; the visual reaction kettle is sequentially connected with the pressure gauge, the gas mass flow meter, the pressure regulating valve and the gas source, and is also connected with the constant-temperature water tank through the water source switch; the heating sleeve is arranged outside the reaction kettle; and the plurality of temperature sensors and pressure sensors are distributed at two ends of the reaction kettle respectively. When the device is used for well cementation, a cement paste cylinder is fixed at the central position in the kettle body, and cement paste is filled in the paste cylinder; and when the device is used for drilling, a drilling fluid circulating pipeline is arranged at the central position in the kettle bodyand connected with a drilling fluid pumping pipeline. The testing process is simple and rapid, and the device can be used for researching the influence rule of hydration heat release of cement pasteand drilling fluid on the stability of the natural gas hydrate.

Description

technical field [0001] The invention relates to a device for measuring and observing the stability of natural gas hydrate under specific conditions, in particular to a device for testing the influence of cement slurry / drilling fluid hydration heat on the stability of natural gas hydrate. Background technique [0002] In the process of natural gas transportation, we often encounter the problem of blockage of the circulation pipeline due to natural gas entering the fluid to form hydrates in some special positions in the wellbore and pipeline, or the pipeline formed by the accumulation of natural gas in a specific area due to the large drop of the pipeline clogged. [0003] In well cementing operations, especially in deep sea well cementing, whether the hydration heat of cement slurry can damage the stability of gas hydrate layer is a problem that has been paid close attention to in the field of petroleum exploitation. If the stability of the gas hydrate in the hydrate layer i...

AI Technical Summary

Problems solved by technology

[0004] At present, the conditions for the stable existence of natural gas hydrate are mostly simulated and calculated by digital simulation technology for pressure and temperature, but there will always be certain errors between the set parameters and the on-site construction environment, so that the results cannot always perfectly fit the construction In the field, the formula obtained by numerical fitting is relatively consistent under certain conditions. If the mining site is changed or the conditions are different, the applicability of the formula will be problematic.

[0005] For simulating the formation and decomposition of natural gas hydrate indoors, there are the following defects: it is impossible to visually observe the internal conditions of the reactor body; the detection and control of pressure and temperature lack certain accuracy; the gas-liquid contact only exists at the gas-liquid interface, and the contact area Confinement has a certain impact on the formation of gas hydrates

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