Experimental device and method for evaluating dynamic formation of hydrates in oil and gas drilling

Abstract

The invention discloses an experimental device and method for evaluating dynamic formation of hydrates in oil and gas drilling. The experimental device comprises a high-pressure reaction kettle, a pressure control device, a temperature control device and a data acquisition device; a visual window is arranged in the middle of the high-pressure reaction kettle, a separation block is arranged in the inner cavity of the high-pressure reaction kettle, the separation block is installed and the height is adjusted through a pushing rod, the two sides of the high-pressure reaction kettle are fixed on a support through a rotating shaft, so that the high-pressure reaction kettle can rotate in a range between 0 degree and 180 degrees, a fixing piece is arranged on the support and used for fixing the inclination angle of the high-pressure reaction kettle, and an angle measuring mechanism is further arranged on the support and is used for accurately reading the inclination angle of the high-pressure reaction kettle. The experimental device and method have the advantages that formation and gathering processes of hydrates in a mineshaft and a pipeline of an angle building section or a horizontal section of a vertical well or a horizontal well under conditions of different temperatures, pressure, stirring rates, gas production rates and fluid over-flow areas can be well simulated, the simulation condition is consistent with the actual working condition, and parameter control is accurate.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploration and development, in particular to an experimental device and method for evaluating the dynamic formation of hydrates in oil and gas drilling. Background technique [0002] Natural gas hydrate is usually a cage-like ice-like crystalline compound formed by water molecules and small hydrocarbon gas molecules (mainly CH4) under high-pressure and low-temperature conditions. ice". Natural gas hydrate has the characteristics of wide distribution, abundant reserves, and high energy density. It is a new type of clean alternative energy with huge reserves. In nature, natural gas hydrates are mainly distributed in seabed sediments and permafrost. It is estimated that the carbon in the form of hydrates is twice the total carbon in fossil fuels on the earth, so many countries regard it as New alternative energy sources for the future. [0003] However, the formation and decomposition...

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Problems solved by technology

However, this invention only focuses on the changes in temperature, pressure and fluid flow channel conditions, and does not study the formation and accumulation of hydrates when the migration of bubbles in the vertical well, horizontal well deflection section or horizontal section liquid is hindered. The impact of the rotation of the drill pipe on the formation and accumulation of hydrates during the drilling process is also not considered. The simulation conditions are limited. The simulation effect of the experimental device is quite different from the working conditions in deep-sea oil and gas drilling, and a comprehensive simulation cannot be carried out.

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