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High-density cement slurry suitable for shale gas cementing and preparation method of high-density cement slurry
The invention discloses high-density cement slurry suitable for shale gas cementing. The high-density cement slurry is prepared from the following raw materials in parts by weight: 100 parts of cement, 44-57 parts of fresh water, 15-120 parts of a weighting agent, 0-30 parts of a weighting stabilizer, 30-40 parts of a high-temperature strength stabilizer, 3-5 parts of an elasto-plastic agent, 4-7 parts of a fluid loss agent, 1-2.5 parts of a retarder and 0.5-2.5 parts of a dispersant. The preparation method comprises the following steps of weighing the cement, the fresh water, the weighting agent, the weighting stabilizer, the high-temperature strength stabilizer, filler, the elasto-plastic agent, the fluid loss agent, the retarder, the dispersant and a defoaming agent according to the ratio; mixing the components, and stirring to obtain the high-density cement slurry suitable for shale gas cementing. The high-density cement slurry is easily pulped at normal temperature and is good in high-temperature sedimentation stability, capable of improving the breaking strength, shock resistance and toughness of hardened cement slurry, relatively wide in density adjustable range and capable of meeting various shale gas cementing requirements.
High-density cement slurry suitable for shale gas cementing and preparation method of high-density cement slurry
The invention discloses high-density cement slurry suitable for shale gas cementing. The high-density cement slurry is prepared from the following raw materials in parts by weight: 100 parts of cement, 44-57 parts of fresh water, 15-120 parts of a weighting agent, 0-30 parts of a weighting stabilizer, 30-40 parts of a high-temperature strength stabilizer, 3-5 parts of an elasto-plastic agent, 4-7 parts of a fluid loss agent, 1-2.5 parts of a retarder and 0.5-2.5 parts of a dispersant. The preparation method comprises the following steps of weighing the cement, the fresh water, the weighting agent, the weighting stabilizer, the high-temperature strength stabilizer, filler, the elasto-plastic agent, the fluid loss agent, the retarder, the dispersant and a defoaming agent according to the ratio; mixing the components, and stirring to obtain the high-density cement slurry suitable for shale gas cementing. The high-density cement slurry is easily pulped at normal temperature and is good in high-temperature sedimentation stability, capable of improving the breaking strength, shock resistance and toughness of hardened cement slurry, relatively wide in density adjustable range and capable of meeting various shale gas cementing requirements.
High-density cement slurry suitable for shale gas cementing and preparation method of high-density cement slurry
ZHU CHENG (author) / TANG CHANGQIANG (author) / LI YONG (author)
2015-11-11
Patent
Electronic Resource
English
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| European Patent Office | 2024
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