High density ultramicro formation testing working solution and preparation method thereof

Abstract

The invention relates to a high density ultramicro formation testing working solution and a preparation method thereof. The high density ultramicro formation testing working solution comprises the following raw material components in parts by weight: 100-500 parts of water, 0.1-10 parts of high temperature resistance dispersing agent, 0.1-10 parts of high temperature resistance dispersion stabilizer, 0.6-2.0 parts of sodium hydroxide, 5-30 parts of anti-agglomerant, 0.1-10 parts of flow pattern modifier, 0.1-8 parts of filtration control agent, and a weighting agent, and the density of the high density ultramicro formation testing working solution is 1.5-2.5g / cm<3>. The preparation method comprises the following steps of: sequentially adding the raw materials into the water under the condition of stirring, and after uniform blending, obtaining the high density ultramicro formation testing working solution. The high density ultramicro formation testing working solution has excellent high temperature sedimentary stability and rheological property, and is applicable to formation testing working conditions of a deep well and an ultra deep well.

Description

technical field [0001] The invention relates to a high-density ultra-micro oil testing working fluid and a preparation method thereof, in particular to a high-density ultra-micro oil testing working fluid with excellent high-temperature settlement stability and rheological properties and a preparation method thereof, belonging to the technical field of petroleum exploitation . Background technique [0002] Well testing operations are operations that test oil and gas after the well is completed. It is a means for petroleum exploration wells to submit geological reports and obtain important data, providing a basic basis for oil and gas evaluation. Well completion is an important work in oilfield development, and the reservoir opening plan and downhole operation measures must be realized through the well completion string. [0003] The current development problem is that the well depth of ultra-deep wells and complex wells is generally 6000-8000 meters, which makes the oil te...

AI Technical Summary

Problems solved by technology

In the long-term (12-20 days) high-temperature static state in the downhole, various additives in the oil test working fluid for drilling fluid reformation are prone to failure, resulting in low-density solid phase solidification and high-density solid phase precipitation, which can easily lead to contamination of the reservoir and the occurrence of downhole complex situations such as stuck packers

Another commonly used working fluid for high-density oil testing is high-density brine, but the viscosity of brine is too low, which can easily lead to excessive gas slippage and cause well control risks, and low-temperature crystallization and downhole string corrosion are prone to occur at the operation site. Phenomenon

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