AQUEOUS AGENT AND POWDER OF GEMINI-TYPE SHALE INHIBITOR FOR WATER-BASED DRILLING FLUIDS, PREPARATION METHODS THEREFOR AND USE THEREOF, AND INHIBITOR AND USE THEREOF

Title:

AQUEOUS AGENT AND POWDER OF GEMINI-TYPE SHALE INHIBITOR FOR WATER-BASED DRILLING FLUIDS, PREPARATION METHODS THEREFOR AND USE THEREOF, AND INHIBITOR AND USE THEREOF

Document Type and Number:

WIPO Patent Application WO/2019/109610

Kind Code:

A1

Abstract:

Disclosed are an aqueous agent and powder of a Gemini-type shale inhibitor for water-based drilling fluids, preparation methods therefor, and an inhibitor. After adding the Gemini-type shale inhibitor for water-based drilling fluids to a water-based drilling fluid, excess negative charges in clay can be neutralized by cations, and hydroxy groups contained in molecules form multiple hydrogen bonds with oxygen atoms on the surface of the clay, thereby enhancing the adhesion effect thereof and preventing water molecules from penetrating into a crystal layer of the clay and causing hydration, so that the aim of inhibiting the swelling of clay minerals when same encounter water is achieved. In general, the Gemini-type shale inhibitor for water-based drilling fluids has an enhanced inhibiting effect, and also has the effect of adsorbing and neutralizing cations and the effect of adhering multiple hydrogen bonds of hydroxy groups; furthermore, same has a good dispersibility and a good long-term stability, can still significantly maintain the inhibition of the hydration and swelling of clay after repeated scouring, and has a stable chemical structure, and an excellent temperature resistance and salt tolerance.

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Inventors:

WANG JIYU (CN)
WANG MENGYING (CN)
REN SHAN (CN)
ZHANG SHAOBIN (CN)
ZHANG YUANKANG (CN)
TUO HONGMEI (CN)
HOU XIANGQIAN (CN)
TANG CHAOJUN (CN)
KOU JIANG (CN)

Application Number:

PCT/CN2018/089364

Publication Date:

June 13, 2019

Filing Date:

May 31, 2018

Export Citation:

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Assignee:

CHENGDU LEARN PRACTICES TECH CO LTD (CN)

International Classes:

C09K8/035; C07C213/08; C07C215/40

Domestic Patent References:

WO2015126418A1

2015-08-27

Foreign References:

CN104521960A	2015-04-22
CN103707588A	2014-04-09
CA2628498C	2015-03-31
JP2017052751A	2017-03-16

Other References:

DU WEICHAO ET AL: "Synthesis and performance of a Gemini surfactant as a shale inhibitor", FINE CHEMICALS, vol. 34, no. 04, 30 April 2017 (2017-04-30), pages 1.2.1 - 1.3.2

Attorney, Agent or Firm:

CHOFN INTELLECTUAL PROPERTY (CN)

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