Frozen ground region negative-temperature well cementation cement slurry, preparation method and applications thereof

Abstract

The invention relates to the technical field of oil field well cementation, particularly to a frozen ground region negative-temperature well cementation cement slurry, a preparation method and applications thereof, wherein the frozen ground region negative-temperature well cementation cement slurry comprises, by weight, 100 parts of modified aluminate cement, 6-15 parts of a negative-temperature anti-freezing early strength agent, 0.05-3 parts of an alcohol-ammonia coagulant, 40-44 parts of water, 0-5 parts of a light metal expanding agent and 0-6 parts of a non-ionic polymer fluid loss agent.According to the invention, the frozen ground region negative-temperature well cementation cement slurry is good in rheological property, can be cured within 3 h at a temperature of -18 DEG C, has a24-h compressive strength of up to 6 MPa, can effectively solve the problems that cement is not cured and has no strength, the well cementation quality of the low-temperature frozen ground region is poor, and even well cementation operation cannot be completely conducted due to liquid-phase segregation ice condensation of the conventional cement slurry in a negative temperature environment, and meets the well cementation construction requirements of frozen ground regions.

Description

technical field

[0001] The invention relates to the technical field of oil field cementing, and more particularly relates to a negative temperature cementing cement slurry in permafrost regions and a preparation method and application thereof. Background technique

[0002] Polar cold sea areas have important strategic value for oil and gas exploration and development. However, these areas are mostly located in permafrost regions. The conditions for exploration and development are very harsh and they face many challenges. The biggest problem is the extremely low surface temperature. Important oil and gas reservoirs in polar regions are mostly distributed in permafrost areas, with temperatures ranging from -5 to -8°C, formation ice content as high as 80%, and depths up to 500m. The strength development of the conventional cement slurry system is extremely slow under low temperature conditions. When the ambient temperature is lower than 20°C, the cement induction period is prol...

Examples

Embodiment 1

[0069] Dissolve 6 parts of negative temperature antifreeze and early strength agent in 44 parts of water to form a paste solution and place it in the freezer until the temperature of the solution drops to -18°C. Pour the slurry preparation solution at -18°C into the slurry cup, start the agitator to stir at a low speed, and quickly add 100 parts of modified aluminate cement weighed in proportion, 0.05 parts of alcohol ammonia coagulant, and 2 parts of light metal expansion agent , 3 parts of non-ionic polymer fluid loss reducer, and high-speed stirring for 1 min to obtain the negative temperature cementing cement slurry in the permafrost region.

Embodiment 2

[0071] Dissolve 9 parts of negative temperature antifreeze and early strength agent in 44 parts of water to form a slurry preparation solution and place it in the freezer until the temperature of the solution drops to -18°C. Pour the slurry preparation solution at -18°C into the slurry cup, start the agitator to stir at low speed, and quickly add 100 parts of modified aluminate cement weighed in proportion, 0.5 parts of alcohol ammonia coagulant, and 2 parts of light metal expansion agent , 3 parts of non-ionic polymer fluid loss reducer, and high-speed stirring for 1 min to obtain the negative temperature cementing cement slurry in the permafrost region.

Embodiment 3

[0073]Dissolve 10 parts of negative temperature antifreeze and early strength agent in 44 parts of water to form a slurry preparation solution and place it in the freezer until the temperature of the solution drops to -18°C. Pour the slurry preparation solution at -18°C into the slurry cup, start the agitator to stir at low speed, and quickly add 100 parts of modified aluminate cement weighed in proportion, 1 part of alcohol ammonia coagulant, and 2 parts of light metal expansion agent , 3 parts of non-ionic polymer fluid loss reducer, and high-speed stirring for 1 min to obtain the negative temperature cementing cement slurry in the permafrost region.

technical field

[0001] The invention relates to the technical field of oil field cementing, and more particularly relates to a negative temperature cementing cement slurry in permafrost regions and a preparation method and application thereof. Background technique

[0002] Polar cold sea areas have important strategic value for oil and gas exploration and development. However, these areas are mostly located in permafrost regions. The conditions for exploration and development are very harsh and they face many challenges. The biggest problem is the extremely low surface temperature. Important oil and gas reservoirs in polar regions are mostly distributed in permafrost areas, with temperatures ranging from -5 to -8°C, formation ice content as high as 80%, and depths up to 500m. The strength development of the conventional cement slurry system is extremely slow under low temperature conditions. When the ambient temperature is lower than 20°C, the cement induction period is prol...

Examples

Embodiment 1

[0069] Dissolve 6 parts of negative temperature antifreeze and early strength agent in 44 parts of water to form a paste solution and place it in the freezer until the temperature of the solution drops to -18°C. Pour the slurry preparation solution at -18°C into the slurry cup, start the agitator to stir at a low speed, and quickly add 100 parts of modified aluminate cement weighed in proportion, 0.05 parts of alcohol ammonia coagulant, and 2 parts of light metal expansion agent , 3 parts of non-ionic polymer fluid loss reducer, and high-speed stirring for 1 min to obtain the negative temperature cementing cement slurry in the permafrost region.

Embodiment 2

[0071] Dissolve 9 parts of negative temperature antifreeze and early strength agent in 44 parts of water to form a slurry preparation solution and place it in the freezer until the temperature of the solution drops to -18°C. Pour the slurry preparation solution at -18°C into the slurry cup, start the agitator to stir at low speed, and quickly add 100 parts of modified aluminate cement weighed in proportion, 0.5 parts of alcohol ammonia coagulant, and 2 parts of light metal expansion agent , 3 parts of non-ionic polymer fluid loss reducer, and high-speed stirring for 1 min to obtain the negative temperature cementing cement slurry in the permafrost region.

Embodiment 3

[0073]Dissolve 10 parts of negative temperature antifreeze and early strength agent in 44 parts of water to form a slurry preparation solution and place it in the freezer until the temperature of the solution drops to -18°C. Pour the slurry preparation solution at -18°C into the slurry cup, start the agitator to stir at low speed, and quickly add 100 parts of modified aluminate cement weighed in proportion, 1 part of alcohol ammonia coagulant, and 2 parts of light metal expansion agent , 3 parts of non-ionic polymer fluid loss reducer, and high-speed stirring for 1 min to obtain the negative temperature cementing cement slurry in the permafrost region.

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