Anti-water-blocking agent for drilling fluid and preparation method thereof

A technology for waterproof locking agent and drilling fluid, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of unfavorable release of water locking effect of stagnant fluid near wellbore, and cannot effectively reduce filtrate surface tension and oil-water interfacial tension. , the problem of poor drainage effect of invading liquid, etc., to reduce the surface tension of the solution and the interfacial tension of oil and water, the preparation method is safe and economical, and the conversion rate is high.
CN102887974AActive Publication Date: 2013-01-23CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Publication Date
2013-01-23

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Abstract

The invention relates to an anti-water-blocking agent for drilling fluid and a preparation method thereof. The anti-water-blocking agent is a polymer containing a butyl acrylate (BA) monomer, a methyl methacrylate (MMA) monomer, a methacrylic acid (MAA) monomer, an acrylamide (AM) monomer and a 2-(perfluorohexyl)ethyl methacrylate (G06B) monomer, wherein the mol percent of a is 35.8-36.5%, the mol percent of b is 27.0-30.5%, the mol percent of c is 7.5-9.0% and the mol percent of d is 7.5-9.0%. According to the invention, the anti-water-blocking agent effectively reduces filtrate surface tension and oil-water interfacial tension, improves gas-phase relative permeability, has a good invading fluid draining effect and is beneficial to driving away resident fluid in near wellbore formations in a draining manner so as to better relieve the water blocking effect. The preparation method of the anti-water-blocking agent is safe and economic and has a high conversion rate; and a batch feeding method is used, so that the requirements for low dosage and high performance are met.
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Description

technical field

[0001] The invention belongs to the field of drilling fluid additives, and in particular relates to a waterproof locking agent for reducing water-locking damage of oil and gas reservoirs, reducing the surface tension of drilling fluid filtrate, improving gas-phase permeability of rock cores, and protecting reservoirs, and a preparation method thereof. Background technique

[0002] Low-porosity and low-permeability oil and gas reservoirs generally have high muddy cement content, high water saturation, high capillary pressure, strong water sensitivity, small pore throat, poor permeability, complex structure, serious heterogeneity, and large oil and gas flow resistance, etc. features. A large number of studies have shown that water lock damage is the most important and serious damage type of this type of reservoir, and the damage rate is generally 70%-90%. Drilling fluid is the first foreign fluid in contact with the reservoir, and its filtrate intrusion into t...

Claims

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