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Well cementation cement paste suitable for carbon dioxide flooding well and application of well cementation cement paste
The invention relates to the technical field of oil exploitation, and particularly discloses well cementation cement paste suitable for a carbon dioxide flooding well. The well cementation cement slurry is prepared from the following substances: 0.1-0.4 wt% of a main agent, 0.1-0.4 wt% of an auxiliary agent and 0.1-0.4 wt% of a stabilizing agent, the auxiliary agent is a polycarboxylic acid liquid fluid loss agent PC-G80L with the content of 4wt%; the content of G-grade oil well cement is 63%-69%; and the balance of water. According to the well cementation cement paste, the fluidity is larger than 21 cm, the filter loss is smaller than 50 mL/30 min, the well cementation engineering requirement is met, the pore permeability of set cement is obviously reduced compared with blank set cement, the compressive strength and tensile strength of the set cement are obviously improved compared with the blank set cement, and the carbon dioxide corrosion resistance of the set cement is greatly improved. Moreover, the cement paste system can meet the well cementation and well completion operation requirements of a carbon dioxide flooding oil well in a medium-high temperature reservoir with the temperature of 40-100 DEG C, is environment-friendly, low in equipment requirement and simple in process, and can greatly reduce the subsequent maintenance operation cost of the oil well and improve the economic benefit.
本发明涉及石油开采技术领域，具体公开了一种适用于二氧化碳驱油井的固井水泥浆。所述固井水泥浆由以下物质组成:主剂为粒径8.3‑10.5nm的超小尺寸纳米材料，含量为0.1‑0.4wt％；助剂为聚羧酸类液体降失水剂PC‑G80L含量为4wt％；G级油井水泥含量为63％‑69％；其余为水。本发明提供的固井水泥浆，流动度＞21cm，滤失量＜50mL/30min，满足固井工程要求，水泥石孔渗与空白水泥石对比下降明显，水泥石抗压抗拉强度与空白水泥石对比上升明显，极大地提高了水泥石抗二氧化碳腐蚀能力。不仅如此，该种水泥浆体系，可满足40‑100℃的中高温储层在进行二氧化碳驱油井的固井和完井作业要求，环境友好，对设备要求低，工艺简单，可大幅降低油井后续维护作业成本，提高经济效益。
Well cementation cement paste suitable for carbon dioxide flooding well and application of well cementation cement paste
The invention relates to the technical field of oil exploitation, and particularly discloses well cementation cement paste suitable for a carbon dioxide flooding well. The well cementation cement slurry is prepared from the following substances: 0.1-0.4 wt% of a main agent, 0.1-0.4 wt% of an auxiliary agent and 0.1-0.4 wt% of a stabilizing agent, the auxiliary agent is a polycarboxylic acid liquid fluid loss agent PC-G80L with the content of 4wt%; the content of G-grade oil well cement is 63%-69%; and the balance of water. According to the well cementation cement paste, the fluidity is larger than 21 cm, the filter loss is smaller than 50 mL/30 min, the well cementation engineering requirement is met, the pore permeability of set cement is obviously reduced compared with blank set cement, the compressive strength and tensile strength of the set cement are obviously improved compared with the blank set cement, and the carbon dioxide corrosion resistance of the set cement is greatly improved. Moreover, the cement paste system can meet the well cementation and well completion operation requirements of a carbon dioxide flooding oil well in a medium-high temperature reservoir with the temperature of 40-100 DEG C, is environment-friendly, low in equipment requirement and simple in process, and can greatly reduce the subsequent maintenance operation cost of the oil well and improve the economic benefit.
本发明涉及石油开采技术领域，具体公开了一种适用于二氧化碳驱油井的固井水泥浆。所述固井水泥浆由以下物质组成:主剂为粒径8.3‑10.5nm的超小尺寸纳米材料，含量为0.1‑0.4wt％；助剂为聚羧酸类液体降失水剂PC‑G80L含量为4wt％；G级油井水泥含量为63％‑69％；其余为水。本发明提供的固井水泥浆，流动度＞21cm，滤失量＜50mL/30min，满足固井工程要求，水泥石孔渗与空白水泥石对比下降明显，水泥石抗压抗拉强度与空白水泥石对比上升明显，极大地提高了水泥石抗二氧化碳腐蚀能力。不仅如此，该种水泥浆体系，可满足40‑100℃的中高温储层在进行二氧化碳驱油井的固井和完井作业要求，环境友好，对设备要求低，工艺简单，可大幅降低油井后续维护作业成本，提高经济效益。
Well cementation cement paste suitable for carbon dioxide flooding well and application of well cementation cement paste
一种适用于二氧化碳驱油井的固井水泥浆及其应用
YOU QING (author) / QI ZHIGANG (author) / YANG JIAXU (author) / FENG DEJIE (author) / ZHANG JIANGUO (author) / HU CHENHUI (author) / WANG PAN (author) / XU ZHENGMING (author) / JI DONGQI (author)
2023-02-03
Patent
Electronic Resource
Chinese
| European Patent Office | 2024
| European Patent Office | 2020