Nanofiber-nano-emulsion compound-based reservoir stratum protection agent for drilling fluid and preparation method of reservoir stratum protection agent

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

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

[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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  • Nanofiber-nano-emulsion compound-based reservoir stratum protection agent for drilling fluid and preparation method of reservoir stratum protection agent

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Experimental program
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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 nanofiber suspension

[0040] (1) Add 240~280g of sodium chlorite and 180~230g of glacial acetic acid (98% concentration) in sequence in a 2000mL t...

Embodiment 1

[0059] (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 , until all dissolved; add 120g pretreated bagasse in batches to the above-mentioned three-neck flat-bottomed flask, and stir at a low speed of 100rpm for 40min; Increase the temperature to 60°C, add 40g of dodecyldimethylbenzyl ammonium chloride, and continue the reaction for 1h; transfer the above dispersion system into a 2000mL plastic cup, add excess deionized water, and terminate the reaction; Transfer the system to a centrifuge in batches, centrifuge at 10000rpm for 20min, settle, pour out the supernatant, add deionized water, and centrifuge again at high speed until the supernatant is clear, and centrifuge several times until the system pH is 3~ 4; dialyze the above-mentioned dispersion system in batches through re...

Embodiment 2

[0063] (1) Add 260g of sodium chlorite and 230g of glacial acetic acid (concentration 98%) to a 2000mL three-necked flat-bottomed flask in sequence, adjust the temperature to 80°C, slowly add deionized water dropwise, and gently stir with a glass rod while adding , until all dissolved; in the above-mentioned three-neck flat-bottomed flask, add 160g pretreated bagasse in batches, stir at a low speed of 100rpm for 50min, after the addition, the temperature drops to 45°C, increase the stirring speed to 2000rpm, and stir for 5h; Increase the temperature to 65°C, add 50g of hexadecyldimethylbenzyl ammonium chloride, and continue the reaction for 1.5h; transfer the above dispersion system into a 2000mL plastic cup, add excess deionized water, and terminate the reaction; Transfer the dispersion system to a centrifuge in batches, centrifuge at 10,000rpm for 20min, settle, pour out the supernatant, add deionized water, and centrifuge again at high speed until the supernatant is clear. A...

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Abstract

The invention relates to a nanofiber-nano-emulsion compound-based reservoir stratum protection agent for drilling fluid and a preparation method of the reservoir stratum protection agent. The nanofiber-nano-emulsion compound-based reservoir stratum protection agent comprises the following components in percentage by mass: 12.5-15% of nano-cellulose, 2.5-4.0% of a dispersing agent, 16-17.5% of a cationic nano-emulsion, 4.0-5.0% of stearate and the balance being water. Sugarcane residues are dried, crushed, purified, strongly acidified, dialyzed and cationized, and are combined with the nano-emulsion on the basis to form the reservoir stratum protection agent combining fibers and deformable nano-droplets. And micron calcium carbonate particles with different sizes are used as auxiliary materials, so that the plugging size can be expanded into micron cracks and pores. Under the condition of normal temperature, after 2.0 wt% of the nanofiber-nano-emulsion compound is added into base slurry, in a sandstone rock core with the permeability of 200-500 mD, the plugging rate is increased from 23% to 90% or above, after pollution is conducted for 24 h at the temperature of 150 DEG C, the flowback permeability recovery rate reaches 95% or above, and the effect of the reservoir stratum protection agent is fully proved.

Description

technical field [0001] The invention relates to a reservoir protection agent for drilling fluid. Specifically, during the drilling process of the reservoir, it is necessary to add the reservoir protection agent into the drilling fluid so that it has a certain reservoir protection performance and reduces the impact of the drilling fluid on the reservoir. harm. Background technique [0002] As drilling gradually advances to deep and complex formations, the requirements for drilling fluid performance are getting higher and higher, especially the protection of oil and gas layers. Generally speaking, in the process of reservoir drilling, the density of the drilling fluid needs to be strictly controlled, and the density should not be too high. If the density is too high, too much drilling fluid filtrate and solid phase particles may enter the reservoir, thereby blocking the pore throat. Reduced permeability, thereby reducing oil and gas production. On the basis of controlling th...

Claims

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Application Information

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Patent Type & Authority Applications(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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