Amphiphilic high-temperature-resistant silicon-based fiber plugging agent and preparation method thereof

A plugging agent and high-temperature-resistant technology, which is applied in fiber treatment, chemical instruments and methods, textiles and papermaking, etc., can solve problems such as insufficient temperature resistance of the plugging agent, affect the plugging effect, and fail to achieve the ideal effect, etc., to achieve Good plugging and anti-seepage effects, simple and easy-to-control production process, and good application prospects

Active Publication Date: 2020-06-19
江苏鼎峰石油科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads to the occurrence of leakage or small leakage due to micro-fractures or pores in the formation and low formation pressure coefficient during the oil drilling operation. Blowout and lost circulation caused by too fast oil and gas upward channeling
[0003] At present, most drilling anti-leakage and plugging materials generally have insufficient temperature resistance and single hydrophilic / lipophilic compatibility, which makes the field application flexibility of the plugging materials not good, and is easy to settle out from the drilling fluid system. Seriously affect the plugging effect
In addition, due to the insufficient temperature resistance of most lost circulation agents, they can only be applied to medium and low temperature oil and gas wells, and cannot achieve the desired effect or even be used in high temperature and high pressure drilling above 100°C.

Method used

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  • Amphiphilic high-temperature-resistant silicon-based fiber plugging agent and preparation method thereof
  • Amphiphilic high-temperature-resistant silicon-based fiber plugging agent and preparation method thereof
  • Amphiphilic high-temperature-resistant silicon-based fiber plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Silicon-based fiber preparation: Tetraethyl silicate 700g, calcium carbonate 150g, polyethylene glycol 150g, mix uniformly in a kneader; add distilled water, stir quickly, and adjust to a viscosity of 500mPa·s; pass the solution The spinneret hole is sprayed into the coagulation bath of NaOH aqueous solution with a concentration of 1.0mol / L, and the temperature of the coagulation bath is controlled at 70°C to hydrolyze and polymerize the tetraethyl orthosilicate in the prepolymer solution, and solidify and form;

[0027] (2) Surface modification of silicon-based fibers: Disperse 500 g of silicon-based fibers prepared in the above steps in 1000 mL of distilled water, add 100 g of β-cyclodextrin, stir rapidly to dissolve them completely; heat up to 50°C, add 50mL of oxalic acid and 5mL of sulfuric acid were incubated for 6 hours, then filtered, and the obtained fiber was washed twice with distilled water to obtain an amphiphilic high-temperature resistant silicon-based...

Embodiment 2

[0029] (1) Preparation of silicon-based fiber: tetraethyl orthosilicate 600g, calcium carbonate 100g, polyethylene glycol 150g, methyl cellulose 150g, mix homogeneously in kneader; Add distilled water, stir rapidly, be adjusted to viscosity and be 4000mPa. s; the solution is sprayed into the coagulation bath of NaOH aqueous solution with a concentration of 0.8mol / L through the spinneret hole, and the temperature of the coagulation bath is controlled at 75°C to hydrolyze and polymerize tetraethyl orthosilicate in the prepolymer solution, and coagulate and form ;

[0030] (2) Surface modification of silicon-based fibers: Disperse 500 g of silicon-based fibers prepared in the above steps in 1000 mL of distilled water, add 150 g of α-cyclodextrin, stir rapidly to dissolve them completely; raise the temperature to 50°C, and add 60mL of oxalic acid and 6mL of sulfuric acid were incubated for 6 hours, then filtered, and the obtained fiber was washed twice with distilled water to obta...

Embodiment 3

[0032] (1) Preparation of silicon-based fibers: 800 g of tetraethyl orthosilicate, 100 g of polyvinyl alcohol, and 100 g of methyl cellulose are uniformly mixed in a kneader; distilled water is added, stirred rapidly, and adjusted to a viscosity of 8000 mPa·s; the solution Spray into the coagulation bath of NaOH aqueous solution with a concentration of 0.8mol / L through the spinneret hole, the temperature of the coagulation bath is controlled at 60°C, so that the tetraethyl orthosilicate in the prepolymer solution is hydrolyzed and polymerized, and coagulated into shape;

[0033] (2) Surface modification of silicon-based fibers: Disperse 500 g of silicon-based fibers prepared in the above steps in 1000 mL of distilled water, add 200 g of α-cyclodextrin, stir rapidly to dissolve them completely; raise the temperature to 60°C, add 80mL oxalic acid and 10mL sulfuric acid were incubated for 6 hours, then filtered, and the obtained fiber was washed twice with distilled water to obtai...

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Abstract

The invention discloses an amphiphilic high-temperature-resistant silicon-based fiber plugging agent and a preparation method thereof, and belongs to the technical field of plugging in oil field projects. According to the amphiphilic high-temperature-resistant silicon-based fiber plugging agent, ethyl orthosilicate is taken as a basis, the ethyl orthosilicate is uniformly mixed with a high-temperature-resistant inorganic filler and a forming aid, a mixture is prepared into an aqueous solution with the suitable viscosity, then the aqueous solution is sprayed into a sodium hydroxide aqueous solution coagulating bath through spinneret orifices, and coagulation forming is performed to obtain high-temperature-resistant silicon-based fibers; then cyclodextrin with an amphiphilic structure is used for performing surface grafting treatment on the prepared high-temperature-resistant silicon-based fibers to obtain amphiphilic high-temperature-resistant silicon-based fibers; and the obtained fiber plugging agent can be used in an oil-based drilling fluid and a water-based drilling fluid, is excellent in plugging effect, and can be applied to high-temperature severe environments of drilling deep plugging and the like.

Description

technical field [0001] The invention belongs to the technical field of oilfield engineering plugging, and in particular relates to an amphiphilic high-temperature-resistant silicon-based fiber plugging agent and a preparation method thereof. Background technique [0002] With the in-depth exploration and development of complex formations, the exploitation of domestic oil and gas resources requires more and more drilling fluids. As a supporting technology for drilling fluid, the development and application of drilling fluid leakage prevention and plugging technology is increasingly unable to keep up with the development of drilling fluid. This leads to the occurrence of leakage or small leakage due to micro-fractures or pores in the formation and low formation pressure coefficient during the oil drilling operation. The phenomenon of well blowout and well leakage caused by too fast upward channeling of oil and gas. [0003] At present, most drilling anti-leakage and plugging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/03D06M13/192D01F9/08C09K8/42
CPCD06M15/03D06M13/192D01F9/08C09K8/426C09K2208/08
Inventor 唐华胡杰陈亮于培志
Owner 江苏鼎峰石油科技有限公司
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