Performance and mechanism of the lithium-salt accelerator in improving properties of the oil-well cement under low temperature

doi:10.7623/syxb201101023

Editorial office of ACTA PETROLEI SINICA ›› 2011, Vol. 32 ›› Issue (1): 140-144.DOI: 10.7623/syxb201101023

• Petroleum Exploration • Previous Articles Next Articles

Performance and mechanism of the lithium-salt accelerator in improving properties of the oil-well cement under low temperature

WANG Chengwen 1 WANG Ruihe 1 CHEN Erding 2 PENG Zhigang 3 BU Yuhuan 1

Received:2010-06-11 Revised:2010-08-15 Online:2011-01-25 Published:2011-03-23

锂盐早强剂改善油井水泥的低温性能及其作用机理

王成文 1 王瑞和 1 陈二丁 2 彭志刚 3 步玉环 1

1中国石油大学石油工程学院山东青岛 266555； 2中国石化胜利石油管理局钻井工程技术公司山东东营 257064； 3 中国石化胜利石油管理局钻井工艺研究院山东东营 257017

通讯作者: 王成文
作者简介:王成文，男，1976年1月生，2009年获中国石油大学（华东）博士学位，现为中国石油大学（华东）石油工程学院副教授，主要从事油气井固完井和油田化学方面的研究工作。
基金资助:
国家高技术研究发展计划（863）项目（2006AA09Z340）、教育部博士点基金（20100133120004）和国家科技重大专项（2009ZX05060）联合资助。

Abstract

Abstract:

To shorten the waiting-on-cement time under deepwater and low temperature cementing conditions,the present paper dealt with the influence of a new lithium-salt accelerator on the low-temperature hydration capacity and property of oil-well cement and showed that the lithium-salt accelerator could enhance the low-temperature hydratability of C₃S and C₂S mineral clinkers by means of speeding up the breakdown of protective membranes and shortening the induction period of hydration.Affecting the initial consistency of cement slurry little,the accelerator could shorten the thickening time of the class-G cement slurry,significantly improve the early strength of set cement at low temperature,and show remarkable virtue of acceleration.The lithium-salt accelerator also hardly affected types of hydration products of oil-well cement and these hydration products were mainly composed of calcium silicate gel,calcium-hydroxide crystals and minor ettringite (AFt) crystals,consistent with the hydration product of pure oil-well cement except for denser microstructures than the conventional cement stone.

Key words: accelerator, low temperature, oil-well cement, mechanism, cementing

摘要：

为缩短深水低温固井候凝时间，开展了锂盐早强剂对油井水泥低温水化能力和性能影响的研究。结果表明，锂盐早强剂通过加快水化保护膜破裂使水化诱导期缩短的方式提高油井水泥中C₃S、C₂S 低温水化能力，从而明显缩短油井水泥的低温稠化时间，提高低温抗压强度，并且对水泥浆初始稠度无影响，表现出优异的低温早强功效。锂盐早强剂对油井水泥的水化产物类型无影响，水化产物主要为硅酸钙凝胶、Ca(OH)₂晶体和少量钙钒石AFt晶体，与单纯油井水泥水化产物一致，但水化产物的微观结构较常规水泥石致密。

关键词: 早强剂, 低温, 油井水泥, 作用机理, 固井

WANG Chengwen WANG Ruihe CHEN Erding PENG Zhigang BU Yuhuan. Performance and mechanism of the lithium-salt accelerator in improving properties of the oil-well cement under low temperature[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(1): 140-144.

王成文王瑞和陈二丁彭志刚步玉环. 锂盐早强剂改善油井水泥的低温性能及其作用机理[J]. 石油学报, 2011, 32(1): 140-144.

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Performance and mechanism of the lithium-salt accelerator in improving properties of the oil-well cement under low temperature

锂盐早强剂改善油井水泥的低温性能及其作用机理

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