Application of Cellulose Nanofibers as Flow Regulators for Drilling Fluids

A flow-pattern regulator and nanofiber technology, applied in the field of drilling fluids, can solve the problems of high cost and poor environmental performance, and achieve the regulation of rheological properties, enhancement of shear thinning and thixotropy, and good "viscosity enhancement and shear enhancement". "The effect of performance

Active Publication Date: 2021-03-02
CHINA PETROCHEMICAL CORP +3
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  • 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 Nanofibers as Flow Regulators for Drilling Fluids

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The carboxymethyl cellulose was prepared into a 1% wt aqueous dispersion, and under the action of a homogeneous pressure of 140 MPa, the carboxymethyl cellulose aqueous dispersion was repeatedly processed 8 times by a dynamic ultra-high pressure micro-jet machine, and the obtained product was processed at 12000r. The carboxymethyl cellulose nanofibers were obtained by centrifugation for 20 min at / min and dried at 80°C for 6 h. The measured average diameter was 21 nm and the aspect ratio was 335.

Embodiment 2

[0025] The cationic cellulose was prepared into a 3% wt aqueous dispersion, and under the action of a homogeneous pressure of 120 MPa, the carboxymethyl cellulose aqueous dispersion was repeatedly processed 10 times by a dynamic ultra-high pressure micro-jet machine, and the obtained product was heated at 11000r / min. After centrifugation for 30 min and drying at 100°C for 4 h, cationic cellulose nanofibers were obtained. The average diameter was measured to be 13 nm and the aspect ratio was 458.

Embodiment 3

[0027] The hydroxyethyl cellulose was prepared with a 2% wt aqueous dispersion, and under the action of a homogeneous pressure of 160 MPa, the hydroxyethyl cellulose aqueous dispersion was repeatedly processed 6 times by a dynamic ultra-high pressure micro-jet machine, and the obtained product was processed at 12000r. Centrifugation for 20 min at / min, and drying at 100 °C for 5 h, hydroxyethyl cellulose nanofibers were obtained. The average diameter was measured to be 28 nm, and the aspect ratio was 275.

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

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Abstract

The invention relates to the application of a cellulose nanofiber as a flow pattern regulator for drilling fluid. The technical proposal is: the cellulose nanofiber is used as a flow pattern regulator for drilling fluid, and the filling amount of the cellulose nanofiber in the drilling fluid is 0.1-3.0%, according to the volume ratio. The beneficial effects are: the cellulose chains of the present invention are entangled with each other to form a three-dimensional net-like space grid structure, which achieves the purpose of "increasing viscosity and lifting cut". At the same time, this space grid structure is easily destroyed under the action of external force It will recover when the external force is removed, and has the characteristics of "rapid weak gel", which helps to enhance the shear dilution and thixotropy of the drilling fluid system, thereby effectively regulating the rheological properties of the drilling fluid system; the invention provides As a flow pattern regulator for drilling fluid, cellulose nanofibers not only have good drilling fluid "viscosity increase and shearing" performance, but also have the advantages of being renewable, non-toxic and degradable, and low cost.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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