High-temperature salt-resistant fluid loss agent and production method thereof

Abstract

The invention relates to a high-temperature salt-resistant fluid loss agent CG910L and a production method thereof, belonging to the field of casing and cementing. The high-temperature salt-resistant fluid loss agent CG910L meets the requirement of casing and cementing work when a well is drilled in case of seep well and complex stratum and aims at improving the construction performance of cement slurry, reducing the filter loss of the cement slurry and reducing the shrinkage mass of cement stone. The high-temperature salt-resistant fluid loss agent CG910L comprises the following components: 2-acrylamido 2-methyl propanesulfonic acid, acrylamide, methacrylic acid, acrylonitrile, an activating agent, an initiator, an emulsifying agent, a terminating agent and deionized water. The high-temperature salt-resistant fluid loss agent CG910L has the following advantages that 1, the construction performance of the cement can be improved; 2, the filter loss of the cement slurry can be reduced; 3, the shrinkage mass of the cement stone can be reduced, and the gluing characteristic among a cement ring, a sleeve and the stratum can be improved; 4, the elasticity and the impact resistance of the cement stone can be improved, the production service life of an oil-gas well can be prolonged, and the fragmentation degree of the cement ring caused by perforation can be reduced; and 5, the use temperature range is: 150-180.

Description

technical field [0001] The invention relates to a high-temperature salt-resistant fluid-loss-reducing agent CG910L and a production method belonging to the field of cementing engineering, which meet the needs of cementing operations under drilling conditions of deep wells and complex formations. Background technique [0002] For the high-temperature, high-pressure, salt-resistant system, my country's research and development is relatively backward, and its technical application level is still in the theoretical category and the experimental exploration stage. In particular, the existing cement admixture products have poor quality and stability, and the formed cement slurry has poor performance. , low temperature and salt resistance, serious pollution to oil and gas layers, and the cementing quality cannot meet the construction requirements. At present, in most cases, foreign products have to be introduced to ensure the quality of cementing, which directly increases the drilli...

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Problems solved by technology

[0002] For the high-temperature, high-pressure, salt-resistant system, my country's research and development is relatively backward, and its technical application level is still in the theoretical category and the experimental exploration stage. In particular, the existing cement admixture products have poor quality and stability, and the formed cement slurry has poor performance. , low temperature and salt resistance, serious pollution to oil and gas layers, cementing quality can not meet the construction requirements

At present, in most cases, foreign products have to be introduced to ensure the quality of cementing, which directly increases the drilling cost, and the import or introduction of related admixtures alone is far from meeting the needs of deep well cementing in oil fields. Therefore, research and development of new high-temperature salt-resistant cement Admixtures (mainly retarders, fluid loss reducers, and early strength agents, other existing admixtures and admixtures can meet the performance requirements) are extremely necessary

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