Device and method for measuring thermal insulation performance of test fluid in annulus of deep-water gas well

Abstract

The invention relates to a device for measuring the thermal insulation performance of annulus test fluid in a deep-water gas well, comprising: a wellbore, a gas supply system, a hot water supply system, an annulus test fluid supply system, a liquid film measurement system, a droplet measurement system, and a temperature measurement system , pressure measurement system, gas-liquid mixer, gas-liquid separator; the liquid film measurement system is used to measure the flow rate of the liquid film in the gas-liquid two-phase ring fog flow in the wellbore inner pipe; the droplet measurement system is used to measure the gas-liquid in the wellbore inner pipe The velocity and size of the droplets in the two-phase annular fog flow; the temperature and pressure measurement system monitors the temperature and pressure data at the upper and lower ends of the inner tube and the annular tube in real time, and transmits the monitored temperature and pressure data to the computer. The invention can accurately measure the speed and size of the liquid droplet in the wellbore, the flow rate of the liquid film, and the temperature and pressure of the wellbore inlet and outlet under the condition of annular mist flow, obtain specific heat transfer parameters, and then calculate the convective heat transfer coefficient of the annular space test fluid, measure Insulation performance of annular test fluid.

Description

technical field [0001] The invention belongs to the field of offshore oil and gas exploration and development, and in particular relates to a device and a method for measuring the thermal insulation performance of a deep-water gas well annulus test fluid. Background technique [0002] When deepwater natural gas is drilled and produced, the low temperature conditions in deep water will affect the density and rheology of the drilling fluid. The natural gas in the wellbore will form hydrates under high pressure and low temperature conditions, resulting in blockage of the choke pipeline. Waxy deposits still exist in the wellbore at low temperature. These problems are closely related to the temperature in the wellbore, and the core scientific problem is the prediction of the wellbore temperature and pressure in the deep water low temperature environment. [0003] The wellbore temperature field has the characteristics of multiple temperature gradients (longitudinal) and multiple t...

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Problems solved by technology

[0003] The wellbore temperature field has the characteristics of multiple temperature gradients (longitudinal) and multiple temperature boundaries (horizontal) during deepwater gas well testing. It is clear that the error of the commonly used prediction methods at home and abroad exceeds 55%, which greatly increases the risk of the test. It is necessary to study the insulation mechanism of the test fluid in the annular space

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