Viscosifier for drilling fluid and preparation method thereof

A technology of drilling fluid and viscosifier, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problem that the high temperature resistance performance cannot meet the high temperature construction requirements, the viscosifying effect of the viscosifier decreases rapidly, and the viscosifier cannot To meet the construction requirements and other issues, to achieve a wide range of practical application prospects and economic benefits, good viscosity-increasing effect, and good viscosity-increasing performance
CN103113518AActive Publication Date: 2013-05-22CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Publication Date
2013-05-22

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Abstract

The invention discloses a viscosifier for drilling fluid and a preparation method thereof. An amphiprotic hydrophobic association type water-soluble viscosifier for drilling fluid is prepared by steps of mixing water-soluble monomers with hydrophobic monomers to perform a polymerization reaction, wherein the water-soluble monomers and the hydrophobic monomers have different ion categories. Amphiprotic ionic groups simultaneously exist in the structure of the viscosifier for drilling fluid provided by the invention to effectively absorb or bridge clay particles so as to guarantee an excellent tackifying effect; meanwhile, the ionic water-soluble monomers can be used for greatly improving the content of hydrophobic units in the polymer structure through hydrophilic ionic groups on the condition of high macromolecular water-solubility; and the ionic hydrophobic monomer units are introduced to guarantee the tackifying effect and water loss reduction effect of the viscosifier under high-temperature and high-salt conditions through hydrophobic association. As shown in an experimental result, the viscosifier provided by the invention still has excellent tackifying performance when the temperature is as high as 260 DEG C, and meanwhile, the viscosifier has excellent high-temperature and high-pressure water loss performance, so that the viscosifier has extensive practical application prospect and economic benefit.
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Description

technical field

[0001] The invention relates to the technical field of petroleum, in particular to a drilling fluid viscosifier and a preparation method thereof. Background technique

[0002] With the continuous expansion of demand for oil and natural gas, oil and gas exploitation has gradually entered the development stage of complex geological conditions such as deep wells and ultra-deep wells. The higher and higher bottom-hole construction temperature and circulation temperature put forward the actual demand of high temperature resistance for related additives in the petroleum industry. Drilling fluid is the first fluid that comes into contact with oil and gas reservoirs. Its performance plays a vital role in ensuring wellbore stability and improving well completion quality. Therefore, improving the high temperature resistance of drilling fluid is an urgent problem to be solved at present. .

[0003] In the prior art, the high temperature resistance of drilling fluid is...

Claims

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