A kind of high temperature resistant Portland cement slurry and preparation method thereof

A technology of portland cement and portland, which is applied in the field of oil well cement, can solve the problems that the cement sheath loses its interlayer isolation ability, easily causes cementing accidents, and the compressive strength is easy to decline, so as to reduce the cementing construction work cost, improve the safety of cementing construction, and the effect of no decline in compressive strength
CN108298902BActive Publication Date: 2020-10-09CHINA NAT PETROLEUM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Publication Date
2020-10-09

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Abstract

The invention provides a high temperature resistant portland cement slurry and a preparation method thereof. The high temperature Portland cement slurry comprises the following components by weight: 100 parts of oil well portland cement, 60-85 parts of high-temperature reinforcing materials, 68-80 parts of fresh water, 1-200 parts of density regulator, 0.1-1.5 parts Suspension stabilizer, 0.8-1.5 parts of dispersant, 3-4 parts of fluid loss reducer, 0-3 parts of retarder and 0.2-0.8 parts of defoamer. The high-temperature resistant portland cement slurry has good settlement stability at room temperature, and its strength develops rapidly at low temperature, and its compressive strength is as high as 40MPa or more at 350°C. It meets the field application requirements of heavy oil thermal recovery wells and reaches the level of Portland G grade cement for oil and gas well cementing.
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Description

technical field

[0001] The invention belongs to the technical field of oil well cement, and relates to a high-temperature resistant Portland cement slurry and a preparation method thereof. Background technique

[0002] At present, heavy oil recovery is mainly based on thermal oil recovery, and the steam temperature is usually as high as 350°C during thermal oil recovery. Under the condition of high-temperature thermal recovery, the wellbore will repeatedly withstand the high temperature generated by steam for multiple cycles. The compressive strength of the oil well cement sheath will decline under high temperature, the permeability will increase, and the stability and homogeneity of cement stone will be destroyed, which directly affects the wellbore. Integrity greatly shortens the production life of heavy oil thermal recovery wells and reduces production efficiency. Therefore, it is necessary to develop a cement slurry system that can improve the compressive strength at hi...

Claims

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