Low-heat-conductivity heat-insulation test fluid, and preparation method and application thereof

Abstract

The invention provides a low-heat-conductivity heat-insulation test fluid, and a preparation method and application thereof. The test fluid comprises water, a low-heat-conductivity base fluid, a high-temperature-resistant deoxygenation agent, a filming inhibitor, a passivating inhibitor and a weighting agent, wherein the low-heat-conductivity base fluid is binary or ternary organic alcohol mutually soluble with water and has molecular weight of no more than 100 and a heat conductivity coefficient of no more than 0.3 W / m.K. The preparation method comprises the following steps: adding water, the low-heat-conductivity base fluid, the high-temperature-resistant deoxygenation agent, the filming inhibitor, the passivating inhibitor and the weighting agent and carrying out mixing under stirring. The low-heat-conductivity heat-insulation test fluid provided by the invention can be used as a heat-insulation test fluid or heat-insulation packer fluid in deep wells or ultra-deep wells with a bottom hole temperature of no more than 175 DEG C, has low heat conductivity coefficient and good heat insulation effect, anti-swelling performance, anticorrosion performance and gas hydrate inhibition performance, and is applicable to a wide range of temperatures and densities.

Description

Technical field [0001] This application relates to but not limited to the technical field of oil and gas well testing, and particularly relates to but not limited to a low thermal conductivity and thermal insulation test fluid and its preparation method and application. Background technique [0002] With the continuous increase in deep water and ultra-deep water well exploration and drilling operations, follow-up operators' demand for test fluid technology will become greater and greater. Compared with land and shallow sea wells, during the testing of deep water and ultra-deep water oil and gas wells, the flow of high-pressure oil and gas in the formation from bottom to top through the riser will cause heat loss, lowering the temperature of the fluid in the entire wellbore, and prone to low temperature salt. The risk of precipitation and formation of gas hydrates. The document "Deep water solid-free water-based thermal insulation packer technology" discloses a solid-free deep wa...

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Problems solved by technology

[0003] Although the above-mentioned packer fluid has a low thermal conductivity and achieves a heat insulation effect, its density and applicable temperature range are narrow, so the field application is very limited; another deep-water test fluid is aggravated by non-inorganic salts. The cost is high, the configuration process is complicated, and it is not conducive to operation. At the same time, the thermal insulation effect of the system is poor, which has great limitations in practical applications, especially for deep water wells that require strict thermal insulation effects, and is not suitable for application

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