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硅酸钠对固井施工安全的影响
郭胜来1, 步玉环1, 步万荣2, 沈忠厚1, 杜 甫3, 郭辛阳1
(1.中国石油大学石油工程学院,山东青岛 266580;2.大港油田滩海开发公司,天津 300280;3.长城钻探固井公司,辽宁盘锦 124000)
摘要:
硅酸钠对油井水泥缓凝剂具有促凝和助缓凝两种相互矛盾的作用,为满足固井施工安全性的需求,研究高模数硅酸钠对不同缓凝剂的影响。在分析硅酸钠对不同缓凝剂水泥浆体系水化机制影响的基础上,研究硅酸钠模数、硅酸钠加量等因素对硅酸钠助缓凝效果的影响。结果表明:硅酸钠对加有缓凝剂柠檬酸、酒石酸、氧化锌的水泥浆起到促凝作用,对葡萄糖酸钠起到助缓凝作用;模数为1的硅酸钠缩短了加有葡萄糖酸钠水泥浆的稠化时间,模数为2.2与3.3的硅酸钠延长了水泥浆的稠化时间;在葡萄糖酸钠加量为0.05%与0.075%的情况下,硅酸钠对静止的水泥浆起促凝作用,加量提高对流动的水泥浆起到先缓凝后促凝的作用,缓解了现场固井后候凝时间长的问题;加有硅酸钠的复配缓凝剂与葡萄糖酸钠相比,大温差适应能力好,有利于缩短候凝时间、改善长封固段井的固井质量。
关键词:  硅酸钠  缓凝剂  固井安全  稠化时间  凝结时间
DOI:10.3969/j.issn.1673-5005.2014.01.016
分类号:TE 256.7 〖HTH〗
基金项目:国家高技术研究发展计划项目(2012AA091501);教育部“长江学者和创新团队发展计划”项目(IRT1086);山东省自然科学基金项目(ZR2010EM003);中央高校基本科研业务费专项(12CX04020A)
Effects of sodium silicate on safety of cementing operation
GUO Sheng-lai1, BU Yu-huan1, BU Wan-rong2, SHEN Zhong-hou1, DU Fu3, GUO Xin-yang1
(1.College of Petroleum Engineering in China University of Petroleum, Qingdao 266580,China;2.Dagang Oilfield Shallow Water Development Company, Tianjin 300280, China;3.CNPC Great Wall Drilling Cementing Company, Panjin 124000, China)
Abstract:
In the oil well cement, sodium silicate is used as anti-settling agent and accelerating agent, but high modulus sodium silicate can serve as a retarding enhancing agent which could extend the thickening time of the cement slurry. On the basis of the contradiction between the accelerating and retarding enhancer ability, the effects of high modulus sodium silicate on the different kinds of cement retarder were studied to guarantee the cementing operation safety. The effects of the molar ratio of sodium silicate, and the dosage of sodium silicate on sodium silicate as retarder enhancer were also studied. The experimental results show that the high modulus sodium silicate demonstrates not only the accelerating effect on the cement slurry with the retarder citric acid, tartaric acid and zinc oxide, but also the retarding enhancing effect on the gluconate sodium. Sodium silicate with molar ratio of 1shortens the thickening time of the slurry, and sodium silicate with molar ratio of 2.2or 3.3extends the thickening time. On the conditions of the dosage of sodium gluconate of 0.05% or 0.075%, sodium silicate shortens the setting time of slurry, which alleviates the problem of lengthy time for waiting on cement, and the thickening time of slurry increases first and then decreases with the increasing dosage of sodium silicate. The built retarder with sodium silicate has a better adaptability to the large temperature difference than the sodium gluconate, which helps the shortening of waiting time on cementing and improve the cementing quality of long open hole well.
Key words:  sodium silicate  retarder  cementing security  thickening time  setting time
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