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A kind of reservoir protective agent for drilling fluid based on nanofiber-nanoemulsion composite and preparation method thereof

A reservoir protection agent and nanofiber technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of single reservoir protection agent and poor plugging effect

Active Publication Date: 2022-07-19
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

[0005] The purpose of the present invention is to solve the problem that the current reservoir protection agent is single and the last stage plugging effect is not good, and propose a reservoir protection agent for drilling fluid based on nanofiber-nanoemulsion composite

Method used

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  • A kind of reservoir protective agent for drilling fluid based on nanofiber-nanoemulsion composite and preparation method thereof

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preparation example Construction

[0033] The concrete preparation method of the present invention comprises the following steps:

[0034] 1. Pretreatment of bagasse

[0035] (1) Wash the bagasse with deionized water, dry it, press it with a press for several times, squeeze out all the sugar in it, wash it with deionized water, and put it in an oven at 80℃± Dry at 5°C for 5h, take out;

[0036] (2) Pulverize the dried bagasse with a pulverizer, inspect it with a standard inspection sieve, pulverize it to 800-1000 mesh, and set aside.

[0037] Among them, the used bagasse is the residue after the sugar cane is squeezed. The sugar cane is mainly produced in subtropical regions such as Guangxi and Guangdong, and the main components are vitamins, fats, protein organic acids, calcium, iron and other substances.

[0038] 2. Preparation of Nanofiber Suspension

[0039] (1) Add 240~280g sodium chlorite and 180~230g glacial acetic acid (concentration 98%) to a 2000mL three-necked flat-bottomed flask in sequence, adju...

Embodiment 1

[0058] (1) Add 240g of sodium chlorite and 180g of glacial acetic acid (concentration 98%) to a 2000mL three-necked flat-bottomed flask in turn, adjust the temperature to 70°C, slowly add deionized water dropwise, and gently stir with a glass rod while adding dropwise. , until all dissolved; add 120g of pretreated bagasse in batches to the above-mentioned three-necked flat-bottomed flask, stir at a low speed of 100rpm for 40min, after adding, reduce the temperature to 40℃, increase the stirring speed to 2000rpm, and stir for 4h; The temperature was raised to 60 °C, 40 g of dodecyldimethylbenzyl ammonium chloride was added, and the reaction was continued for 1 h; the above dispersion system was transferred to a 2000 mL plastic cup, and excess deionized water was added to terminate the reaction; the above dispersion was The system was transferred to a centrifuge in batches, centrifuged at 10,000 rpm for 20 min, precipitated, poured out the supernatant, added deionized water, and ...

Embodiment 2

[0062] (1) Add 260g sodium chlorite and 230g glacial acetic acid (concentration 98%) to a 2000mL three-necked flat-bottomed flask in turn, adjust the temperature to 80°C, slowly add deionized water dropwise, and gently stir with a glass rod while adding dropwise. , until all dissolved; add 160g of pretreated bagasse in batches to the above-mentioned three-necked flat-bottomed flask, stir at a low speed of 100rpm for 50min, after adding, reduce the temperature to 45°C, increase the stirring speed to 2000rpm, and stir for 5h; The temperature was raised to 65 °C, 50 g of cetyl dimethyl benzyl ammonium chloride was added, and the reaction was continued for 1.5 h; the above dispersion system was transferred to a 2000 mL plastic cup, and excess deionized water was added to terminate the reaction; The dispersion system was transferred to a centrifuge in batches, centrifuged at 10,000 rpm for 20 minutes, precipitated, poured out the supernatant, added deionized water, and centrifuged a...

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Abstract

The invention relates to a reservoir protective agent for drilling fluid based on nanofiber-nanoemulsion composite and a preparation method. The following components are calculated by mass percentage: nanocellulose 12.5-15%, dispersant 2.5-4.0%, cationic Nanoemulsion 16~17.5%, 4.0~5.0% stearate, and the balance is water. Through drying, crushing, purification, strong acidification, dialysis, cationization of sugarcane residue, and combining with nanoemulsion on this basis, a reservoir protective agent combining fibers and deformable nano-droplets is formed. Under normal temperature conditions, after adding 2.0wt% nanofiber-nanoemulsion composite into the base slurry, in the sandstone core with a permeability of 200~500mD, the plugging rate increased from 23% to more than 90%, and the pollution at 150°C for 24h After that, the flowback permeability recovery rate reached more than 95%, which fully proved the effect of the reservoir protective agent.

Description

technical field [0001] The invention relates to a reservoir protective agent for drilling fluid. Specifically, in the process of reservoir drilling, the reservoir protective agent needs to be added to the drilling fluid to make it have certain reservoir protection performance and reduce the effect of the drilling fluid on the reservoir. harm. Background technique [0002] As drilling gradually advances to deep and complex formations, the requirements for the performance of drilling fluids are getting higher and higher, especially the protection of oil and gas layers is paid more and more attention. Generally speaking, in the process of reservoir drilling, the density of drilling fluid needs to be strictly controlled, and the density should not be too high. Too high density may cause too much drilling fluid filtrate and solid phase particles to enter the reservoir, thereby blocking the pore throats. Reduce permeability, thereby reducing oil and gas production. On the basis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 蓝强张妍徐运波郑成胜于雷刘振东陈健吴雄军张虹王莉萍
Owner 中石化石油工程技术服务有限公司
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