High density ultramicro formation testing working solution and preparation method thereof

A kind of oil testing working fluid and high-density technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of well control risk, excessive gas slippage speed, easy failure of additives, etc., and achieve excellent high temperature settlement Stability and rheology, high recycling value, strong suspension stability effect

Active Publication Date: 2013-07-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • High density ultramicro formation testing working solution and preparation method thereof
  • High density ultramicro formation testing working solution and preparation method thereof

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Embodiment 1

[0022] This embodiment provides a density of 1.7g / cm 3 The high-density ultramicro oil test oil working fluid, which is prepared by the following method:

[0023] Put 100m in the preparation tank 3 Fresh water, under high-speed stirring at 8000-12000 rpm, add 0.3t polyacrylate, 0.2t mixture of oleic acid and linoleic acid sodium salt (the two are mixed in any mass ratio), 0.12t sodium hydroxide , 1t of a mixture of sorbitol and polyethylene glycol (the two are mixed in any mass ratio), 0.3t of modified lignosulfonate, 0.2t of low-viscosity PAC, and 17.5t of barite powder to the high-density ultramicro test The density of the oil working fluid reaches 1.7g / cm 3 , after fully stirring and mixing evenly, when the average particle size of the solid phase in the working solution is measured by a laser particle size analyzer (D 50 ) is less than 4 microns (the average particle size of the solid phase is the average particle size of the barite powder), the high-density ultra-micro...

Embodiment 2

[0025] This embodiment provides a density of 2.1g / cm 3 The high-density ultramicro oil test oil working fluid, which is prepared by the following method:

[0026] Put 10m in the high-performance wet mill reactor 3Fresh water, under high-speed stirring at 8000-12000 rpm, add 0.05t of polyacrylate and polyacrylamide salt mixture (the two are mixed in any mass ratio), 0.03t of oleic acid and linoleic acid sodium salt in sequence Mixture (the two are mixed in any mass ratio), 0.012t sodium hydroxide, 0.1t sorbitol and polyethylene glycol mixture (the two are mixed in any mass ratio), 0.05t modified lignosulfonate, 0.01t Low-viscosity PAC, barite powder 2.75t until the density of the high-density ultra-micro test oil test working fluid reaches 2.1g / cm 3 , fully stirred and mixed evenly, when the average particle size of the solid phase in the working fluid is measured by a laser particle size analyzer (D 50 ) is less than 3 microns (the average particle size of the solid phase i...

Embodiment 3

[0028] This embodiment provides a density of 2.3g / cm 3 The high-density ultramicro oil test oil working fluid, which is prepared by the following method:

[0029] Put 10m in the high-performance wet mill reactor 3 Fresh water, under high-speed stirring at 8000-12000 rpm, add 0.08t polyacrylate, 0.04t mixture of oleic acid and linoleic acid sodium salt (the two are mixed in any mass ratio), 0.01t methyl polyacrylate Acrylate, 0.012t sodium hydroxide, 0.1t sorbitol, a mixture of polyethylene glycol and triethanolamine (the three are mixed in any mass ratio), 0.08t modified lignosulfonate, 0.01t low-viscosity PAC and yellow The mixture of raw gum (the two are mixed in any mass ratio), barite powder 3.25t until the density of the high-density ultra-micro test oil test working fluid reaches 2.3g / cm 3 , fully stirred and mixed evenly, when the average particle size of the solid phase in the working fluid is measured by a laser particle size analyzer (D 50 ) is less than 2 microns...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/00
Inventor 叶艳安文华尹达李磊鄢捷年王义虎
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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