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High-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer for water-based drilling fluid and preparation method of high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer

A water-based drilling fluid and hydrophobic association technology, applied in the field of drilling, can solve the problems of drilling fluid viscosity increase, large viscosity change, unfavorable drilling fluid rheological performance stability, etc., to reduce fluid loss and viscosity change with temperature. The effect of small, excellent fluid loss reduction performance and viscosity increasing performance

Pending Publication Date: 2022-07-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluid loss reducer has excellent effects of increasing viscosity and reducing fluid loss at high temperature, but with the increase of temperature, the viscosity of the drilling fluid increases seriously, and the viscosity changes greatly, which is not conducive to the stability of the rheological properties of the drilling fluid at high temperature

Method used

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  • High-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer for water-based drilling fluid and preparation method of high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer
  • High-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer for water-based drilling fluid and preparation method of high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer
  • High-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer for water-based drilling fluid and preparation method of high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0035] Mix ethanol and water in a volume ratio of 1:10 to prepare 100 mL of ethanol aqueous solution; under nitrogen protection and stirring conditions, mix 5 g of γ-methacryloyloxypropyltrimethoxysilane with 5 g of dimethoxy(methyl) base) phenylsilane was added to the above ethanol aqueous solution, the pH of the system was adjusted to 5.5 with a mass fraction of 10% HCl solution, and the reaction was performed at a constant temperature of 60 °C for 4 h; after the reaction was completed, the obtained product was dried at 65 °C to constant weight, The obtained transparent liquid is the hyperbranched polysiloxane crosslinking agent ZB1.

preparation example 2

[0037]Mix ethanol and water in a volume ratio of 1:10 to prepare 100 mL of ethanol aqueous solution; under nitrogen protection and stirring, mix 5 g of γ-methacryloyloxypropyltrimethoxysilane with 4 g of dimethoxy(methyl) base) phenylsilane was added to the above aqueous ethanol solution, the pH of the system was adjusted to 5.5 with a mass fraction of 10% HCl solution, and the reaction was performed at a constant temperature of 60 °C for 3 h; after the reaction was completed, the obtained product was dried at 65 °C to constant weight, The obtained transparent liquid is the hyperbranched polysiloxane crosslinking agent ZB2.

Embodiment 1

[0039] A preparation method of a high temperature resistant and high salt resistant micro-crosslinking hydrophobic association viscosity-increasing and fluid-loss reducing agent for water-based drilling fluid, comprising the following steps:

[0040] Add 100g distilled water and 0.5g sodium dodecyl sulfate to a 250mL beaker, stir with a magnetic stirrer at 200r / min until fully dissolved; weigh 20g acrylamide, 10g sodium styrene sulfonate, 4g maleic anhydride, 2g Lauryl methacrylate and 0.2 g of cross-linking agent ZB1 were added to the beaker, stirred until fully dispersed and uniform; the pH of the reaction system in the beaker was adjusted to 7 with 40% NaOH solution, and the reaction system was transferred to a three-necked flask, The water bath was heated to 65°C under magnetic stirring; under nitrogen protection, 0.1 g of ammonium persulfate was added to the flask, and the reaction was kept constant at 65°C for 4 h and nitrogen was passed through the reaction; The viscous...

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Abstract

The invention provides a high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer for a water-based drilling fluid and a preparation method of the high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association tackifying filtrate reducer. The tackifying filtrate reducer is prepared by copolymerizing a comonomer, a cross-linking agent, a cosolvent and an initiator in water, the comonomer comprises a vinyl monomer, sodium p-styrenesulfonate, maleic anhydride and a long hydrophobic chain ester monomer; wherein on the basis of 100 parts by weight of water, the comonomer accounts for 20-45 parts, and the cosolvent accounts for 0.5-1.5 parts; the mass of the cross-linking agent is 0.4-2% of the mass of the comonomer; and the mass of the initiator is 0.2-0.5% of the mass of the comonomer. The invention also provides a preparation method of the filtrate reducer. Under the high-temperature and high-salt conditions, the viscosity-increasing and filtrate-reducing agent can effectively reduce the filter loss of the drilling fluid, improve the viscosity of the drilling fluid and maintain the rheological stability of the drilling fluid, and can be applied to deep high-salt-content stratum oil and gas drilling.

Description

technical field [0001] The invention relates to a high-temperature-resistant and high-salt-resistant micro-crosslinking hydrophobic association viscosity-increasing and fluid-loss reducing agent for water-based drilling fluid and a preparation method thereof, belonging to the technical field of drilling. Background technique [0002] As my country's oil and natural gas exploration and development efforts increase year by year, the drilling depth and the complexity of the strata encountered continue to increase. Deep formation drilling is often accompanied by problems of high temperature (up to 200°C) and high salt content (up to saturated salt). The rheological properties are significantly deteriorated, which seriously affects the ability of drilling fluid to maintain wellbore stability, carry cuttings and suspend weighted materials, resulting in major safety accidents such as well kicks and blowouts. Therefore, improving the stability of water-based drilling fluid fluid lo...

Claims

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Application Information

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IPC IPC(8): C08F283/12C08F220/56C08F212/14C08F222/06C08F220/18C09K8/035C09K8/24
CPCC08F283/124C09K8/035C09K8/24C08F220/56C08F212/30C08F222/06C08F220/1812C08F220/1818
Inventor 刘敬平张宪法孙金声吕开河王宗轮金家锋黎剑史胜龙徐哲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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