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Modified polysaccharide environment-friendly thickening shearing agent, preparation method and application thereof

A technology for improving viscosity and cutting agent and polysaccharide, which is applied in the field of modified polysaccharide environmental protection viscosity-raising and cutting agent and its preparation, can solve the problem that the comprehensive quality cannot effectively meet the requirements of safe drilling, protect the reservoir and protect the environment, does not have the function of improving shear force, and does not To achieve the ideal effect of sticking and cutting, and achieve the effect of good promotion and application value, good compatibility and easy implementation

Active Publication Date: 2019-07-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the drilling process of conventional wells and exploratory wells, there are many kinds of viscosity-extracting agents for drilling fluids, such as xanthan gum, but its application in drilling fluids is greatly limited due to its high production cost and unstable quality. , such as high-viscosity polyanionic cellulose, carboxymethyl polyanionic cellulose, etc., have a strong ability to increase viscosity, but the ability to increase shear force is weak, or even does not have the function of increasing shear force, making it less than ideal Lifting and cutting effect
Many other adhesive cutting agents, due to the selection of raw materials, production and processing techniques, etc., the final products contain toxic and harmful substances to the environment and human health to varying degrees, and the quality is not stable. In addition, the pursuit of high profits in the market, some of them The overall quality of these products cannot effectively meet the needs of safe drilling, reservoir protection, and environmental protection

Method used

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  • Modified polysaccharide environment-friendly thickening shearing agent, preparation method and application thereof
  • Modified polysaccharide environment-friendly thickening shearing agent, preparation method and application thereof
  • Modified polysaccharide environment-friendly thickening shearing agent, preparation method and application thereof

Examples

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Embodiment 1

[0035] A modified polysaccharide environmental protection viscose cutting agent, including the following components by weight percentage

[0036]

[0037] Preferably, the weight percentage of the lithium aluminum hydride is 0.6%-0.8%.

[0038] In actual use, the natural polysaccharide of formula weight percentage and formula weight percentage of ethylene oxide, propylene oxide, N-methylol acrylamide, 2-dihydroxyl-3-propanesulfonate sodium, ethylene glycol, Triethanolamine undergoes a modification reaction to generate a modified polysaccharide. While grafting long molecular chains in natural polysaccharide molecules, the molecular chains interweave to form a space network structure, and at the same time enhance the water solubility and pulping and gel protection ability of polysaccharides with good compatibility, effectively improving the viscosity and dynamic shear of drilling fluid Strong, non-biological toxicity, biodegradable and environmentally friendly, it meets the r...

Embodiment 2

[0040] A modified polysaccharide environment-friendly sticky cutting agent, the difference from Example 1 is that the initiator is one of hydrogen peroxide, sodium hydrogen peroxide or a mixture of both.

[0041] In actual use, the initiator adopts the technical scheme of one of hydrogen peroxide, sodium hydrogen peroxide or a mixture of the two, so that the graft modification reaction of natural polysaccharides can be carried out at a temperature of 70 ° C to 80 ° C , the reaction temperature is relatively mild. Moreover, the grafting and cross-linking chemical reaction speed is relatively slow, and the reaction process is easy to control, so that the chemical modification reaction is relatively thorough, that is, at a temperature of 70°C to 80°C and a reaction time of 55-65 minutes, 2-dihydroxy - The reaction between sodium 3-propanesulfonate, ethylene glycol and triethanolamine and the intermediate product is fully carried out, and a good modification effect is achieved. I...

Embodiment 3

[0043] A modified polysaccharide environmental-friendly sticky cutting agent, the difference from Example 1 is that the natural polysaccharide is a mixture of one or more of cellulose, starch and glycogen.

[0044] In actual use, the natural polysaccharide adopts the technical solution of one or more mixtures of cellulose, starch and glycogen, so that the source of natural polysaccharide is abundant, the preparation is more convenient, and the cost is lower. During specific implementation, when multiple types of cellulose, starch or glycogen are mixed, the cellulose, starch or glycogen can be mixed in any proportion.

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Abstract

The invention belongs to the technical field of oil and gas well exploitation and especially relates to a modified polysaccharide environment-friendly thickening shearing agent, a preparation method and an application thereof. The modified polysaccharide environment-friendly thickening shearing agent prepared through five steps of emptying air, preparing a primary intermediate product, preparing asecondary intermediate product, adding residual components and then cooling, drying and smashing according to the invention has excellent dispersibility, water solubility and compatibility, is capable of effectively promoting viscosity and dynamic shearing force of drilling fluid, is free from biotoxicity, is biodegradable and environment-friendly and can meet the requirements for the drilling fluid thickening shearing agent in the oil field scale development process, such as safe well drilling, protecting layer and environmental protection. According to the invention, natural polysaccharideis taken as a raw material; the raw material is low in cost; the preparation method and the required preparation conditions are simple; the preparation method is easy to implement, is capable of meeting the requirements of the large-scale drilling construction process for the drilling fluid thickening shearing agent and also is capable of greatly reducing production cost. The invention provides anexcellent technical support to a natural environment-friendly water-based drilling fluid and completion fluid and has an ultrahigh value in popularization and application.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well exploitation, and in particular relates to a modified polysaccharide environmental protection viscosifier and its preparation method and application. Background technique [0002] At present, in the drilling process of conventional wells and exploratory wells, there are many kinds of viscosity-extracting agents for drilling fluids, such as xanthan gum, but its application in drilling fluids is greatly limited due to its high production cost and unstable quality. , such as high-viscosity polyanionic cellulose, carboxymethyl polyanionic cellulose, etc., have a strong ability to increase viscosity, but the ability to increase shear force is weak, or even does not have the function of increasing shear force, making it less than ideal The effect of sticking and cutting. Many other adhesive cutting agents, due to the selection of raw materials, production and processing techniques, etc., the f...

Claims

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Application Information

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IPC IPC(8): C09K8/20
CPCC09K8/206
Inventor 黎金明王长宁陈在君杨斌张建斌张小平贾俊雷江董宏伟郭康陈磊郑玉辉苏欢张长庚王勇强俞浩杰蔺文洁周强
Owner BC P INC CHINA NAT PETROLEUM CORP