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A kind of amphiphilic high temperature resistant silicon-based fiber plugging agent and preparation method thereof

A plugging agent, high temperature resistance technology, applied in fiber processing, chemical instruments and methods, textiles and papermaking, etc., can solve problems such as affecting the plugging effect, insufficient temperature resistance of the plugging agent, and inability to achieve the desired effect, etc. The production process is simple and easy to control, the effect of good plugging and anti-seepage effect, and good application prospect.

Active Publication Date: 2022-05-27
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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  • A kind of amphiphilic high temperature resistant silicon-based fiber plugging agent and preparation method thereof
  • A kind of amphiphilic high temperature resistant silicon-based fiber plugging agent and preparation method thereof
  • A kind of 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: ethyl orthosilicate 700g, calcium carbonate 150g, polyethylene glycol 150g are mixed in a kneader; add distilled water, stir rapidly, and adjust to a viscosity of 500mPa s; this solution is passed through 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 ℃, so that the ethyl orthosilicate in the prepolymer solution is hydrolyzed and polymerized, and then coagulated and formed;

[0027] (2) Surface modification of silicon-based fibers: 500 g of silicon-based fibers prepared in the above steps were dispersed in 1000 mL of distilled water, 100 g of β-cyclodextrin was added, and rapidly stirred to dissolve it completely; 50 mL of oxalic acid and 5 mL of sulfuric acid were incubated and reacted for 6 hours and then filtered, and the obtained fibers were washed twice with distilled water to obtain an amphiphilic h...

Embodiment 2

[0029] (1) Preparation of silicon-based fibers: 600 g of tetraethyl orthosilicate, 100 g of calcium carbonate, 150 g of polyethylene glycol, and 150 g of methyl cellulose are mixed well in a kneader; add distilled water, stir rapidly, and adjust to a viscosity of 4000 mPa. s; the solution is sprayed into the coagulation bath of NaOH aqueous solution with a concentration of 0.8 mol / L through the spinneret, and the temperature of the coagulation bath is controlled at 75 ° C, so that the ethyl orthosilicate in the prepolymer solution is hydrolyzed and polymerized, and coagulated and formed. ;

[0030] (2) Surface modification of silicon-based fibers: 500 g of silicon-based fibers prepared in the above steps were dispersed in 1000 mL of distilled water, 150 g of α-cyclodextrin was added, and 150 g of α-cyclodextrin was added to dissolve it completely; 60 mL of oxalic acid and 6 mL of sulfuric acid were incubated and reacted for 6 hours and then filtered, and the obtained fibers we...

Embodiment 3

[0032] (1) silicon-based fiber preparation: 800g of ethyl orthosilicate, 100g of polyvinyl alcohol, and 100g of methyl cellulose are mixed in a kneader; add distilled water, stir rapidly, and adjust to a viscosity of 8000mPa s; this solution It is sprayed into the coagulation bath of NaOH aqueous solution with a concentration of 0.8mol / L through the spinneret, and the temperature of the coagulation bath is controlled at 60°C, so that the ethyl orthosilicate in the prepolymer solution is hydrolyzed and polymerized, and coagulated and formed;

[0033] (2) Surface modification of silicon-based fibers: 500 g of silicon-based fibers prepared in the above steps were dispersed in 1000 mL of distilled water, 200 g of α-cyclodextrin was added, and rapidly stirred to completely dissolve; 80 mL of oxalic acid and 10 mL of sulfuric acid were incubated and reacted for 6 hours, filtered, and the obtained fiber was washed twice with distilled water to obtain an amphiphilic high-temperature re...

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Abstract

The invention discloses an amphiphilic high-temperature-resistant silicon-based fiber plugging agent and a preparation method thereof, belonging to the technical field of oil field engineering plugging; the amphiphilic high-temperature resistant silicon-based fiber plugging agent described in the invention is based Based on ethyl acetate, mixed with high-temperature-resistant inorganic fillers and molding aids, prepared into an aqueous solution with a suitable viscosity, and then sprayed it into a solidification bath of sodium hydroxide aqueous solution through the spinneret hole, solidified and formed, and obtained high-temperature-resistant silicon base fiber; then use cyclodextrin with amphiphilic structure to carry out surface grafting treatment on the prepared high-temperature resistant silicon-based fiber to obtain amphiphilic high-temperature resistant silicon-based fiber; the obtained product can be used in oil-based drilling fluid or It can be used in water-based drilling fluid with excellent plugging effect, and can be used in high-temperature and harsh environments such as plugging in deep layers of drilling.

Description

technical field [0001] The invention belongs to the technical field of oilfield engineering plugging, in particular 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 strata, the demand for drilling fluids in the exploitation of domestic oil and gas resources is increasing. As a supporting technology for drilling fluids, the development and application of leakage prevention and plugging technologies for drilling fluids are increasingly unable to keep up with the development of drilling fluids. This leads to leakage or small leakage from time to time during oil drilling operations due to the existence of micro-fractures or pores in the formation and the low pressure coefficient of the formation. It leads to the phenomenon of blowout and leakage caused by the excessively fast upward channeling speed of oil and gas. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Patents(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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