Oil-based mud flushing fluid for well cementing and preparation method thereof

A technology of oil-based mud and flushing fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult cleaning and affecting the cementing quality of the two interfaces
CN105315978BActive Publication Date: 2018-06-29CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2018-06-29

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Abstract

The invention discloses a well cementation oil-based slurry flushing liquid and a preparation method thereof. The flushing liquid comprises the components of, by weight, 100 parts of water, 4-8 parts of a nonionic surfactant, 5-8 parts of an anionic surfactant, 4-5 parts of an amphoteric surfactant, 1-2 parts of Span 80, 1-2 parts of Tween 80, and 0.2-3.5 parts of a tackifying and shear-strength-improving agent. The method comprises the following steps: according to the formula, the tackifying and shear-strength-improving agent is added, and the material is well mixed by stirring; the other components are added, and the mixture is well mixed by stirring, such that the well cementation oil-based mud flushing liquid is obtained. The flushing liquid provided by the invention has certain shearing strength and viscosity. Under the effect of hydraulic machinery, a dragging effect can be performed on oil slurry and oil films. Also, the flushing liquid has high emulsifying effects, and can be used for emulsifying the oil films and residual oil, such that viscose oil-based drilling fluid can be effectively cleaned. The flushing fluid is suitable to be used for flushing oil-based drilling fluid with high plastic viscosity and shearing force.
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Description

technical field

[0001] The invention relates to the field of oil field cementing, and more specifically, relates to an oil-based mud flushing fluid for well cementing and a preparation method thereof. Background technique

[0002] Borehole wall instability brings certain difficulties to operations such as drilling, geological logging, logging and cementing. Oil-based drilling fluid is often used to solve shale stability problems, and has achieved good drilling results. However, as far as the cementing construction is concerned, the oil-based drilling fluid will stay at the interface and form oil slurry and oil film, which will seriously affect the interface bonding strength of the cement sheath and reduce the sealing quality of the cement sheath. Before operation, a flushing fluid with high-efficiency flushing effect should be injected to clean the oil slurry, oil film and mud cake adhering to the interface, improve the cementation environment of the annular space interface...

Claims

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