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Modified nano silicon dioxide, high-temperature-resistant tackifying and shear strength improving agent and preparation methods and applications of modified nano silicon dioxide and high-temperature-resistant tackifying

A nano-silica, high-temperature-resistant technology, applied in the direction of chemical instruments and methods, silicon organic compounds, drilling compositions, etc., can solve the problem of lowering the strength of the drilling fluid system, losing the cutting effect, affecting the ROP, etc. Problems, to achieve excellent solid phase suspension ability, improve low shear rate viscosity, and improve structural strength

Pending Publication Date: 2022-07-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing viscosity-increasing and cutting materials are generally difficult to play a role in high-temperature environments above 200°C. For example, organic soils will lose their cutting effect due to the thermal decomposition of the modifier when the temperature is above 200°C. The system is excessively thickened (plastic viscosity is too high) due to too high solid content, which affects the ROP
Most of the fatty acid derivatives viscosifying and shearing agents will fail due to thermal decomposition when the temperature is above 200°C, resulting in a significant decrease in the structural strength of the drilling fluid and causing solid phase settlement such as barite

Method used

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  • Modified nano silicon dioxide, high-temperature-resistant tackifying and shear strength improving agent and preparation methods and applications of modified nano silicon dioxide and high-temperature-resistant tackifying
  • Modified nano silicon dioxide, high-temperature-resistant tackifying and shear strength improving agent and preparation methods and applications of modified nano silicon dioxide and high-temperature-resistant tackifying
  • Modified nano silicon dioxide, high-temperature-resistant tackifying and shear strength improving agent and preparation methods and applications of modified nano silicon dioxide and high-temperature-resistant tackifying

Examples

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Effect test

Embodiment 1

[0044] The present embodiment provides a modified nano-silicon dioxide and a high-temperature anti-viscosity and cutting-lifting agent, and the preparation method thereof is as follows:

[0045] In 100mL absolute ethanol, add 2g nano-silicon dioxide and ultrasonically disperse 30min, then add aminosilane coupling agent KH550 (the nano-silicon dioxide in silicon and aminosilane coupling agent KH550 The amino molar dosage ratio is 1: 0.2) mix homogeneously, and raise the temperature to 50 ℃, react 90min, then suction filtration obtains the first reaction product; The first reaction product and octadecane unsaturated fatty acid dimer are added in the there-necked flask (nanometer in terms of silicon). The molar ratio of the carboxyl groups of silica and octadecane unsaturated fatty acid dimer is 1:0.1), under the condition of nitrogen flow, with a stirring speed of 100r / min, the temperature is raised to 100 ° C, maintained for 30min, and then the stirring speed is increased to 25...

Embodiment 2

[0048] The present embodiment provides a modified nano-silicon dioxide and a high-temperature anti-viscosity and cutting-lifting agent, and the preparation method thereof is as follows:

[0049] In 100mL absolute ethanol, add 2g nano-silicon dioxide and ultrasonically disperse for 30min, then add aminosilane coupling agent KH550 (the molar ratio of the amine groups of silica and aminosilane coupling agent KH550 in terms of silicon is 1:0.6 ) mix evenly, and raise the temperature to 60 DEG C and react for 120min, then suction filtration to obtain the first reaction product; the first reaction product and octadecane unsaturated fatty acid dimer are added to the there-necked flask (nano dioxide in silicon The molar ratio of carboxyl groups of silicon and octadecane unsaturated fatty acid dimer is 1:0.05), under the condition of nitrogen, with stirring speed of 100r / min, the temperature is raised to 100℃, maintained for 30min, and then the stirring speed is increased to 250r / min m...

Embodiment 3

[0052] The present embodiment provides a modified nano-silicon dioxide and a high-temperature anti-viscosity and cutting-lifting agent, and the preparation method thereof is as follows:

[0053] In 100mL absolute ethanol, add 2g nano-silicon dioxide and ultrasonically disperse 30min, then add aminosilane coupling agent KH550 (the nano-silicon dioxide in silicon and aminosilane coupling agent KH550 The amino molar dosage ratio is 1: 0.2) mix uniformly, and raise the temperature to 50 DEG C and react for 90min, then suction filtration to obtain the first reaction product; the first reaction product and octadecane unsaturated fatty acid dimer are added to the there-necked flask (nano-dimer in terms of silicon). The molar ratio of carboxyl groups of silicon oxide and octadecane unsaturated fatty acid dimer is 1:0.01), under the condition of nitrogen, with stirring speed of 100r / min, heat up to 100℃, maintain for 30min, and then increase the stirring speed to 250r / min and the temp...

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Abstract

The invention provides modified nano silicon dioxide, a high-temperature-resistant tackifying and shear-improving agent and preparation methods and applications of the modified nano silicon dioxide and the high-temperature-resistant tackifying and shear-improving agent, and the preparation method of the modified nano silicon dioxide comprises the following steps: S1, carrying out first contact reaction on nano silicon dioxide and an amino-containing silane coupling agent in an alcohol solvent to obtain a first contact reaction product; s2, the first contact reaction product and polyfatty acid are subjected to a second contact reaction, the modified nano-silica is obtained, and the polyfatty acid is selected from C18 unsaturated fatty acid dimer or C18 unsaturated fatty acid trimer. The modified nano silicon dioxide and the high-temperature-resistant tackifying and shear-improving agent disclosed by the invention can effectively improve the structural strength of a water-in-oil emulsified drilling fluid system in an extreme high-temperature environment, especially improve the dynamic shear force and low-shear-rate viscosity of the water-in-oil emulsified drilling fluid, and further improve the sedimentation stability of the water-in-oil emulsified drilling fluid system.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a preparation method and application of a modified nano-silicon dioxide, a high-temperature-resistant viscosity-increasing and cutting-lifting agent, and the two. Background technique [0002] Compared with water-based drilling fluids, water-in-oil emulsion drilling fluids generally have better high temperature stability and are the main drilling fluid technology for drilling high temperature deep wells. In recent years, with the deepening of the exploration and development of oil and gas resources, the number of deep and ultra-deep wells has gradually increased, and the upper limit of the bottom hole temperature has been constantly updated, which has brought more and more severe challenges to the water-in-oil emulsion drilling fluid technology. [0003] High temperature and deep wells are generally accompanied by large bottom hole pressure, so water-in-oil emulsion...

Claims

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Application Information

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IPC IPC(8): C07F7/08C09K8/03C09K8/36
CPCC07F7/0838C09K8/03C09K8/36C07B2200/11C09K2208/10
Inventor 倪晓骁史赫王建华闫丽丽杨海军刘人铜张家旗崔小勃耿愿高珊王立辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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