Cement slurry/drilling fluid hydration heat influence gas hydrate stability testing device

Abstract

The invention relates to a testing device for the influence of cement slurry / drilling fluid hydration heat on the stability of natural gas hydrate, including 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, and a visual response Kettle 8, control panel 13, computer 16, heating jacket 23, pressure sensor 24, temperature sensor 25, the visual reactor is connected to pressure gauge, gas mass flow meter, pressure regulating valve and gas source in turn, and also connected to constant temperature water tank through water source switch ; The reaction kettle is covered with a heating jacket, and a number of temperature sensors and pressure sensors are respectively distributed at both ends. When used for cementing, the cement slurry cylinder is fixed in the central position of the kettle body, and the slurry cylinder is filled with cement slurry; when used for drilling, the central position of the kettle body is the drilling fluid circulation pipeline, and the drilling fluid circulation pipeline is connected to the drilling fluid pumping pipeline. The testing process of the invention is simple and quick, and can be used to study the law of influence of cement slurry and drilling fluid hydration heat release on the stability of 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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