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

A technology of nano-fiber and filtrate reducing agent, applied in the field of drilling fluid products, can solve the problem of not involving or involving the synergy of nano-fibers, etc., and achieve the effect of improving temperature resistance and filtrate reducing 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

However, this fluid loss control agent only involves the interaction between nanofibers and other cellulose products, and its role in fluid loss control. It does not involve the method of preparing nanofibers from sugarcane, nor does it involve nanofibers and carboxymethyl Synergistic effect between base chitosan

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Add 200g of glacial acetic acid (concentration 98%) and 100-200g of hypochlorous acid into a 2000mL three-necked round-bottomed flask, slowly add 900mL of deionized water, stir while adding dropwise (speed 300rpm), and adjust the temperature to 30 ℃ until completely dissolved; add 400g of pretreated bagasse in batches to the above-mentioned three-necked flask, and stir at a low speed of 300rpm for 1h. Obtain a milky white suspension; adjust the pH of the previous milky white suspension to 4.0-5.0, add 20 g of cetyltrimethylammonium bromide, and continue the reaction for 1 h. Transfer the system into a 5000mL large plastic cup, add excess deionized water to terminate the reaction; transfer the above dispersion system to a centrifuge in batches, centrifuge at 20000rpm for 20min, settle, pour out the supernatant, and add Ionized water, centrifuged at high speed again until the supernatant liquid is clear, centrifuged several times until the pH of the system is 5.0-6.0;...

Embodiment 2

[0039] (1) Add 250g of glacial acetic acid (concentration 98%) and 150g of hypochlorous acid into a 2000mL three-necked round-bottomed flask, slowly add 900mL of deionized water, stir while adding dropwise (speed 300rpm), and adjust the temperature to 30°C. Until it is completely dissolved; add 500g of pretreated bagasse in batches to the above-mentioned three-neck flask, stir at a low speed of 300rpm for 1h, after the addition, the temperature rises to 50°C, raise the stirring speed to 2000rpm, and stir for 2h to obtain milky white Suspension: adjust the pH of the previous milky white suspension to 4.0-5.0, add 25g of dodecyltrimethylammonium bromide, and continue the reaction for 1.5h. Transfer the system into a 5000mL large plastic cup, add excess deionized water, and terminate the reaction; transfer the above dispersion system to a centrifuge in batches, centrifuge at 20000rpm for 20min, settle, pour out the supernatant, and add Ionized water, centrifuged at high speed aga...

Embodiment 3

[0041] (1) Add 300g of glacial acetic acid (concentration 98%) and 200g of hypochlorous acid into a 2000mL three-necked round-bottomed flask, slowly add 900mL of deionized water, stir while adding dropwise (speed 300rpm), adjust the temperature to 30°C, Until it is completely dissolved; add 600g of pretreated bagasse in batches to the above-mentioned three-neck flask, stir at a low speed of 300rpm for 1h, after the addition, the temperature rises to 50°C, raise the stirring speed to 2000rpm, and stir for 2h to obtain milky white Suspension: adjust the pH of the previous milky white suspension to 4.0-5.0, add 30 g of dodecyltrimethylammonium chloride, and continue the reaction for 2 hours. Transfer the system into a 5000mL large plastic cup, add excess deionized water, and terminate the reaction; transfer the above dispersion system to a centrifuge in batches, centrifuge at 20000rpm for 20min, settle, pour out the supernatant, and add Ionized water, centrifuged at high speed ag...

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Abstract

The invention discloses a nanofiber-chitosan compound-based filtrate reducer for drilling fluid and a preparation method thereof. Sugarcane residues are dried, crushed, purified, dialyzed, cationizedand combined with carboxymethyl chitosan to form a nanofiber-chitosan compound, and nano-silica enhances the temperature resistance and nano-pore filling capacity; low-molecular alcohol promotes the dispersion of the nano-compound in an aqueous solution and the filling effect of the nano-compound in micro-nano pores of a mud cake, so that the filtrate loss reduction effect is improved. Nanofibersimprove the extensibility and shearing force of carboxymethyl chitosan in a solution; due to the Brownian motion and large specific surface area of the nanoparticles, the temperature resistance of thepolymer and the nanofibers is improved; a network structure formed by the nanofibers and carboxymethyl chitosan effectively protects the nanoparticles, so that the nanoparticles are not combined withother treating agents and clay under a high-temperature condition. Under the condition of normal temperature, after 2.0 wt% of the nanofiber-chitosan compound is added into base slurry, the filter loss can be reduced from 16.5 mL to 5 mL, and after aging at the temperature of 150 DEG C for 16 h, the filter loss can still be kept at 6.2 mL.

Description

technical field [0001] The invention relates to a drilling fluid product used in the process of oil exploration and drilling, in particular to a fluid loss reducer for reducing the green leaves of the drilling fluid from entering the formation and causing well wall instability and reservoir pollution. Background technique [0002] During the drilling process, complex formations will be encountered. During this process, the drilling fluid will contact the formation. At the moment of contact, the drilling fluid filtrate will spontaneously enter the formation. If too much filtrate enters, it may cause formation instability. As a result, accidents such as diameter expansion or shrinkage occur, and in severe cases, it may lead to complex accidents such as well wall instability and pipe sticking. Therefore, in the drilling industry, there are strict requirements on the dehydration of the drilling fluid in the formation. In order to reduce the drilling fluid filtrate entering the ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/42
CPCC09K8/03C09K8/426C09K2208/08C09K2208/12
Inventor 蓝强徐运波张妍郑成胜于雷陈健吴雄军刘振东张虹王莉萍
Owner 中石化石油工程技术服务有限公司