Biomimetic polymer filtrate reducer for drilling fluid

A technology of fluid loss reducer and polymer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve the effects of improving temperature and salt resistance, low permeability, and improving water solubility

Pending Publication Date: 2022-07-05
中石化石油工程技术服务有限公司 +1
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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 provide a biomimetic polymer fluid loss additive for drilling fluids, to solve the problem of not only focusing on fluid loss performance, but also having the ability to resist temperature and salt and prevent pollution to the formation and the environment

Method used

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  • Biomimetic polymer filtrate reducer for drilling fluid
  • Biomimetic polymer filtrate reducer for drilling fluid
  • Biomimetic polymer filtrate reducer for drilling fluid

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Embodiment 1

[0026] In the embodiment of the present invention, a biomimetic polymer fluid loss reducer for drilling fluid, the fluid loss reducer is composed of raw materials in the following proportions by weight:

[0027] Modified lignin 400-500g, 20% NaOH solution 260-300g, 60% sodium hydroxymethanesulfonate solution 400-800g, polyaziridine 100-180g, defoamer 0.5g-1.51g.

[0028] It is composed of raw materials in the following proportions by weight: 450 g of modified lignin, 280 g of 20% NaOH solution, 600 g of 60% sodium hydroxymethanesulfonate solution, 150 g of polyaziridine, and 1 g of defoaming agent.

[0029] Among them, the defoamer is emulsified silicone oil.

[0030] It can be prepared by modifying the modified lignin, wherein, the raw materials in the proportion by weight are composed as follows,

[0031] 1-3L 1% NaOH solution, brown rot lignin 40-120g, 0.22-0.66g NaBH4, 2mol / L hydrochloric acid solution.

[0032] The ratio of modified lignin is modified: 4.2L 1% NaOH solu...

Embodiment 2

[0039] 450g of modified lignin, 280g of 20% NaOH solution, 160g of 60% sodium hydroxymethane sulfonate solution were added to a four-necked flask containing 500 mL of distilled water, heated and refluxed for 1 hour, and then 60% of sodium hydroxymethane sulfonate was added. 160g of solution, refluxed for 1.5h, added defoamer, then added 100g of distilled water and 120g of polyaziridine, mixed and refluxed for about 50min, then added 100g of distilled water and 160g of 60% sodium hydroxymethanesulfonate solution, reacted for half an hour, That is, the final product fluid loss reducer is obtained.

Embodiment 3

[0041] 450g of modified lignin, 280g of 20% NaOH solution, 200g of 60% sodium hydroxymethane sulfonate solution were added to a four-necked flask containing 500 mL of distilled water, heated and refluxed for 1 hour, and then 60% of sodium hydroxymethane sulfonate was added. 200g of the solution, refluxed for 1.5h, added antifoaming agent, then added 100g of distilled water and 150g of polyaziridine, mixed and refluxed for about 50min, then added 100g of distilled water and 200g of 60% sodium hydroxymethanesulfonate solution, reacted for half an hour, That is, the final product fluid loss reducer is obtained.

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Abstract

The invention discloses a biomimetic polymer filtrate reducer for drilling fluid. The filtrate reducer is prepared from the following raw materials in parts by weight: 400 to 500g of modified lignin, 260 to 300g of 20 percent NaOH solution, 400 to 800g of 60 percent sodium hydroxymethyl sulfonate solution, 100 to 180g of polyaziridine and a small amount of defoaming agent. In the preparation process of the filtrate reducer, the ultrahigh adhesion characteristic of catechol groups in mussel byssus protein is utilized, so that the filtrate reducer has the functions of blocking micropores and improving the strength. The modified lignin with catechol groups is obtained by activating and modifying the brown rot lignin, and the modified lignin can be further crosslinked in the drilling fluid to form a gel film with strong cohesion and adhesiveness by utilizing the strong adhesion characteristic of the modified lignin in water, so that a filter cake formed by the drilling fluid is more compact, micropores are blocked, the toughness and strength of the filter cake are improved, and the drilling fluid can be used for drilling fluid. And finally, a low-permeability, flexible, thin and compact filter cake is formed, and the filter loss of the drilling fluid is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a biomimetic polymer fluid loss reducer for drilling fluids. Background technique [0002] With the rapid development of the petroleum industry, the difficulty of drilling oil is becoming more and more difficult. Not only the wells are getting deeper and deeper, but also the well types are becoming more and more complex. From single vertical wells to multi-bottom wells, directional wells, horizontal wells, and extended-reach wells , the requirements for drilling fluid materials are getting higher and higher. Fluid loss reducer is a chemical additive that needs to be added to the drilling fluid in the oil field. During the drilling process, the filtrate in the drilling fluid invades the formation, which will cause the hydration and expansion of shale, and in severe cases, lead to instability of the well wall and various downhole complexities. In other cases, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/20C09K8/24C08H7/00
CPCC09K8/03C09K8/203C09K8/24C08H6/00
Inventor 周成华罗朝东李洁丞张珍蔡静王方博杨国兴张鸿鹄曾艺熊雪莲
Owner 中石化石油工程技术服务有限公司
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