Nanofiber-hydrophobic starch compound-based filtrate reducer for drilling fluid and preparation method thereof

A technology of nanofiber and fluid loss control agent, which is applied in the field of drilling fluid products, can solve problems such as poor temperature resistance, achieve the effect of improving temperature resistance, easy promotion, and improving fluid loss control effect

Active Publication Date: 2021-01-19
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor temperature resistance of starch fluid loss control agents for water-based drilling fluids at present, and to propose a fluid loss control agent for drilling fluids based on nanofiber-hydrophobic starch composites and its preparation method

Method used

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  • Nanofiber-hydrophobic starch compound-based filtrate reducer for drilling fluid and preparation method thereof

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preparation example Construction

[0034] The specific preparation method of the present invention comprises the following steps:

[0035] 1. Pretreatment of bagasse

[0036] (1) Clean the bagasse with deionized water, dry it, and press it with a press for several times in a row. After squeezing out all the sugar, clean it with deionized water, put it in an oven, and heat it at 80℃± Dry at 5°C for 5 hours and take it out;

[0037] (2) Pulverize the dried bagasse with a pulverizer, test with a standard inspection sieve, pulverize to 800 mesh to 1000 mesh, and set aside.

[0038] Among them, the bagasse used is the residue after the sugar cane is squeezed. The sugar cane is mainly produced in subtropical regions such as Guangxi and Guangdong. The main components are vitamins, fat, protein organic acids, calcium, iron and other substances.

[0039] 2. Preparation of Cationic Nanofiber Suspension

[0040] (1) Pour 500~700g of 98% sulfuric acid into a 2000mL three-neck round-bottomed flask, slowly add deionized w...

Embodiment 1

[0057]Pour 500g of 98% sulfuric acid into a 2000mL three-necked round-bottomed flask, slowly add deionized water, stir while adding dropwise (speed 300rpm), adjust the temperature to 45°C until the sulfuric acid is diluted to 64wt%; Put the processed bagasse in a 2000mL flat-bottomed flask, slowly add the prepared 64wt% sulfuric acid dropwise, and stir at a low speed of 300rpm for 50min. , to obtain a milky white suspension; transfer the previous system to a dark place, add 120g of sodium periodate, react for 3h under dark conditions, then add 6mL of ethylene glycol, stir at 1000rpm, continue to react for 1h, remove unreacted high Sodium iodate; increase the temperature of the reactor to 60°C, adjust the pH to 4.0~5.0, add 20g of cetyltrimethylammonium bromide, and continue the reaction for 1h; transfer the above dispersion system into a 5000mL large plastic cup , add excess deionized water to terminate the reaction; transfer the above dispersion system to a centrifuge in batc...

Embodiment 2

[0059] Pour 700g of 98% sulfuric acid into a 2000mL three-necked round-bottomed flask, slowly add deionized water, stir while adding dropwise (speed 300rpm), adjust the temperature to 45°C until the sulfuric acid is diluted to 64wt%; Put the processed bagasse in a 2000mL flat-bottomed flask, slowly add the prepared 64wt% sulfuric acid dropwise, and stir at a low speed of 300rpm for 50min. , to obtain a milky white suspension; transfer the previous system to a dark place, add 130g of sodium periodate, and react for 4h under dark conditions, then add 6mL of ethylene glycol, stir at a speed of 1000rpm, continue to react for 1.5h, and remove unreacted Sodium periodate; increase the temperature of the reactor to 60°C, adjust the pH to 4.0~5.0, add 25g of dodecyltrimethylammonium bromide, and continue the reaction for 1.5h; transfer the above dispersion system to 5000mL large plastic In the cup, add excess deionized water to terminate the reaction; transfer the above dispersion syst...

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Abstract

The invention relates to a nanofiber-hydrophobic starch compound-based filtrate reducer for a drilling fluid. The nanofiber-hydrophobic starch compound-based filtrate reducer comprises the following components in percentage by mass: 33-41% of cationic nano cellulose, 4.5-6.0% of a dispersing agent, 34-43% of hydrophobic modified starch, 11-13% of nano silicon dioxide and 6.5-7.1% of nano graphite.Sugarcane residues are dried, crushed, purified, dialyzed and cationized and are combined with hydrophobic modified starch on the basis to form a nanofiber-hydrophobic modified starch compound, and meanwhile, nano silicon dioxide is used as an auxiliary material, so that the temperature resistance and the nano pore filling capacity of the nanofiber-hydrophobic modified starch compound are enhanced, and the filtrate loss reduction effect of the nanofiber-hydrophobic modified starch compound is improved. The treating agent has strong filtration loss reduction and temperature resistance, is non-toxic, and has no adverse effect on the environment.

Description

technical field [0001] The invention relates to a drilling fluid product used in the oil exploration and drilling process, in particular to a fluid loss control agent which needs to be added in order to prevent well wall instability and reduce the pollution damage of the drilling fluid to the reservoir. Background technique [0002] During the drilling process, many formations will be drilled, and the differences between the formations are very large. Some formations are very complex. In order to prevent the filtrate in the drilling fluid from entering the formation, contact with primary minerals and fluids will cause formation instability. Generally, it is necessary to add a fluid loss reducer to the drilling fluid. The function of the fluid loss reducer is that when the drilling fluid is in contact with the newly drilled formation, it can quickly assist in the formation of a dense mud cake, or slow down the rate at which the filtrate enters the formation, thereby reducing f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08
Inventor 蓝强徐运波张妍刘振东郑成胜于雷吴雄军陈健张虹
Owner 中石化石油工程技术服务有限公司
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