Nanofiber-xanthan gum composite viscosity-increasing and cutting agent for drilling fluid and preparation method

A technology of viscosity raising and cutting agent and nanofiber, which is applied in the field of oil drilling, can solve the problems of weak temperature resistance and poor cutting effect, and achieve the effect of improving temperature resistance, good temperature resistance and simple method

Active Publication Date: 2021-11-16
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a nanofiber-xanthan gum compound viscosity-lifting and shearing agent for drilling fluid and its preparation method, so as to solve the viscosity-lifting effect of the current non-solid / clay-free drilling and completion fluid Problems of poor temperature resistance

Method used

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  • Nanofiber-xanthan gum composite viscosity-increasing and cutting agent for drilling fluid and preparation method
  • Nanofiber-xanthan gum composite viscosity-increasing and cutting agent for drilling fluid and preparation method
  • Nanofiber-xanthan gum composite viscosity-increasing and cutting agent for drilling fluid and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Pour 300g of 98% sulfuric acid into a 1000mL beaker, slowly add deionized water dropwise, while stirring gently with a glass rod, until the sulfuric acid is diluted to 64wt%; add 120g of pretreated bagasse Slowly add 64wt% sulfuric acid to a 2000mL three-necked flat-bottomed flask, and stir at a low speed of 100rpm for 40min. React under the conditions for 3h, then add 6mL of ethylene glycol, stir at 1000rpm, continue to react for 1h, remove unreacted sodium periodate; increase the temperature of the reactor to 60°C, add 30g of trimethylacetyl chloride, and adjust the pH to 5.0, continue to react for 4h; add 20g cetyltrimethylammonium bromide, continue to react for 1h; transfer the above dispersion system into a 2000mL plastic cup, add excess deionized water to terminate the reaction; divide the above dispersion system Batch transfer to a centrifuge, centrifuge at 10,000rpm for 20 minutes, settle, pour out the supernatant, add deionized water, and centrifuge again at hi...

Embodiment 2

[0037] Pour 350g of 98% sulfuric acid into a 1000mL beaker, slowly add deionized water dropwise, while stirring gently with a glass rod, until the sulfuric acid is diluted to 64wt%; add 150g of pretreated bagasse Slowly add 64wt% sulfuric acid to a 2000mL three-necked flat-bottomed flask, and stir at a low speed of 100rpm for 50min. React under the conditions for 4h, then add 6mL of ethylene glycol, stir at 1000rpm, continue to react for 1.5h, remove unreacted sodium periodate; increase the temperature of the reactor to 60°C, add 40g of trimethylacetyl chloride, adjust the pH to 5.0, continue to react for 4h; add 25g of dodecyltrimethylammonium bromide, continue to react for 1.5h; transfer the above dispersion system into a 2000mL plastic cup, add excess deionized water to terminate the reaction; Transfer the 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 ...

Embodiment 3

[0039] Pour 400g of 98% sulfuric acid into a 1000mL beaker, slowly add deionized water dropwise, while stirring gently with a glass rod, until the sulfuric acid is diluted to 64wt%; add 160g of pretreated bagasse Slowly add 64wt% sulfuric acid to a 2000mL three-necked flat-bottomed flask, and stir at a low speed of 100rpm for 60min. Under the conditions of reaction for 5h, then add 6mL of ethylene glycol, stirring speed 1000rpm, continue to react for 2h, remove unreacted sodium periodate; increase the temperature of the reactor to 60°C, add 50g of trimethylacetyl chloride, adjust the pH to 5.0, continue to react for 4h; add 30g of dodecyltrimethylammonium chloride, continue to react for 2h; transfer the above dispersion system to a 2000mL plastic cup, add excess deionized water to terminate the reaction; divide the above dispersion system Batch transfer to a centrifuge, centrifuge at 10,000rpm for 20 minutes, settle, pour out the supernatant, add deionized water, and centrifug...

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Abstract

The nanofiber-xanthan gum compound viscosity and shearing agent for drilling fluid is composed of 55-60% cationic nano-cellulose, 13-15% dispersant, 6.5-11% inorganic salt, and 18-20% xanthan gum; In the present invention, the sugarcane residue is firstly dried, pulverized, purified, strongly acidified, and dialyzed to prepare cationic nanofibers; on this basis, it is combined with xanthan gum and inorganic salts to form a composite viscosity-extracting fiber and spherical natural polymer. The shearing agent has a certain synergistic effect and can increase the viscosity and shearing force of the drilling fluid at the same time.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a nanofiber-xanthan gum compound viscosity-increasing and shearing agent for drilling fluid and a preparation method thereof. Background technique [0002] During the drilling process, many complex formations are encountered. The purpose of adding drilling fluid is mainly to carry the crushed cuttings. Secondly, it can effectively lubricate and cool the drilling tool and speed up the drilling speed. However, if the viscosity of the drilling fluid is insufficient, it will lead to insufficient cuttings carrying capacity, resulting in a decrease in ROP; during workover or other non-operation time, if the suspension capacity of the drilling fluid is insufficient, it will cause Facies, especially barite and cuttings, quickly settle to the bottom of the wellbore, making it difficult to trip and sometimes even lead to buried drill tool accidents. Therefore, the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
CPCC09K8/035C09K2208/08
Inventor 张妍
Owner BINZHOU UNIV
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