Application of cellulose nanofiber as flow pattern regulator for drilling fluids

A technology of flow regulator and nanofiber, which is applied in the field of drilling fluid, can solve the problems of high cost and poor environmental protection performance, and achieve the regulation of rheological properties, enhanced shear thinning and thixotropy, and good "viscosity increase and shear reduction" "The effect of performance

Active Publication Date: 2018-04-24
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of application of cellulose nanofiber as a flow regulator for drilling fluid in view of defects such as high cost and poor environmental protection performance of the synthetic high molecular polymer treatment agent existing in the prior art

Method used

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  • Application of cellulose nanofiber as flow pattern regulator for drilling fluids

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Prepare a 1%wt water dispersion of carboxymethyl cellulose, under the action of a homogeneous pressure of 140MPa, use a dynamic ultra-high pressure micro-fluidizer to repeatedly process the carboxymethyl cellulose water dispersion 8 times, and the obtained product is heated at 12000r Centrifuge at 20 min at 80°C for 20 min, and dry at 80°C for 6 h to obtain carboxymethyl cellulose nanofibers with an average diameter of 21 nm and an aspect ratio of 335.

Embodiment 2

[0025] Cationic cellulose was prepared into a 3%wt aqueous dispersion, and under the action of a homogeneous pressure of 120MPa, the carboxymethyl cellulose aqueous dispersion was repeatedly treated 10 times with a dynamic ultra-high pressure micro-fluidizer, and the obtained product was heated at 11000r / min Centrifuge for 30 minutes and dry at 100°C for 4 hours to obtain cationic cellulose nanofibers with an average diameter of 13 nm and an aspect ratio of 458.

Embodiment 3

[0027] Prepare 2%wt aqueous dispersion of hydroxyethyl cellulose, under the action of homogeneous pressure of 160MPa, use dynamic ultra-high pressure micro-fluidizer to repeatedly process the hydroxyethyl cellulose aqueous dispersion 6 times, and the obtained product is heated at 12000r Centrifuge at 100°C for 20 minutes, and dry at 100°C for 5 hours to obtain hydroxyethyl cellulose nanofibers with an average diameter of 28nm and an aspect ratio of 275.

[0028] The effects of Examples 1-3 will be described below.

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Abstract

The invention relates to application of cellulose nanofiber as a flow pattern regulator for drilling fluids. According to the technical scheme, the cellulose nanofiber applied to the flow pattern regulator for drilling fluids has an addition of 0.1-3.0% in a drilling fluid, by volume. The application has the advantages that cellulose chains are mutually tangled to from a three-dimensional-meshed spatial grid structure which arrives at 'viscosity enhancing and shear improvement'; the spatial grid structure is very easy to damage under the action of external force; after the external force is removed, the spatial grid structure restores; featuring 'rapid weak gelling', the spatial grid structure helps enhance shear dilution and thixotropy of a drilling fluid system, and therefore, rheological properties of the drilling fluid system are effectively controlled; the cellulase nanofiber provided herein as the flow pattern regulator for drilling fluids has good 'viscosity enhancing and shearimprovement' functions for a drilling fluid, and also features regenerability, zero toxicity, degradability, low cost and the like.

Description

technical field [0001] The invention relates to the field of drilling fluid in the oil and natural gas industry, in particular to the application of a cellulose nanofiber as a flow regulator for drilling fluid. Background technique [0002] As the scope of drilling and development of oil and gas resources gradually moves towards deep and ultra-deep layers, ocean deep water, and unconventional formations with complex geological conditions, oil-based drilling fluids have gradually become the preferred drilling fluid system. With continuous improvement, a large amount of waste oil-based drilling fluid and oily drilling cuttings cannot be discharged directly. The harmless treatment process is complicated, the investment in equipment is large, and the treatment cost is high, which greatly limits the scope of its promotion and application. At this stage, the research and development of an environmentally friendly high-performance water-based drilling fluid system with the performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24
CPCC09K8/035C09K8/24
Inventor 刘均一郭保雨邱维清王宝田蒋莉陈二丁柴金鹏张海青袁丽刘伟倪晓凤
Owner CHINA PETROCHEMICAL CORP
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