碳酸盐岩油气藏高温防窜防腐固井技术

doi:10.7623/syxb2012S2019

石油学报 ›› 2012, Vol. 33 ›› Issue (S2): 181-188.DOI: 10.7623/syxb2012S2019

碳酸盐岩油气藏高温防窜防腐固井技术

程荣超 1 　严海兵 2　汪海阁 1　张富成 1 　王世永 3

1. 中国石油集团钻井工程技术研究院北京 100195; 2. 川庆钻探工程有限公司井下作业公司四川成都 610051;3. 中国石油玉门油田分公司钻采工程研究院甘肃酒泉 735019

收稿日期:2012-08-01 修回日期:2012-10-25 出版日期:2012-12-25 发布日期:2013-03-01
通讯作者: 程荣超
作者简介:程荣超，男，1980年11月生，2008年毕业于中国石油大学（华东），现为中国石油集团钻井工程技术研究院高级工程师，主要从事钻井提速技术、固完井技术及钻井战略规划方法研究。
基金资助:
中国石油天然气股份有限公司重大科技专项（2008E-0713）资助。

Anti-channeling and anti-corrosion cementing technology for carbonate reservoirs in high temperature

CHENG Rongchao 1　 YAN Haibing 2 　WANG Haige 1　 ZHANG Fucheng 1　 WANG Shiyong 3

Received:2012-08-01 Revised:2012-10-25 Online:2012-12-25 Published:2013-03-01

摘要/Abstract

摘要：

针对四川龙岗气田在固井过程中面临的井漏、封固井段长、大温差“超缓凝”、高温高压及高含H₂S和CO₂酸性气体等难题，根据不同套管层次的固井要求提出了应对策略，通过机理分析和实验对比方法，成功研制了防漏增韧、抗盐大温差及防腐等3种水泥浆体系。室内实验结果表明：不同尺度、不同弹性模量的纤维群具有阻止微裂纹扩展和搭桥成网的作用，可有效解决固井漏失问题;优选的有机酸淀粉类复合缓凝剂SD210及共聚物类抗盐降失水剂SD130可抗高温160℃，防气窜性能好，可解决177.8mm尾管固井水泥浆超缓凝难题;通过腐蚀前后水泥石抗压强度、渗透率变化对比及X射线衍射(XRD)与扫描电镜法（SEM）分析，证实了通过提高水泥石致密性能实现高效防腐的可行性。龙岗气田现场应用表明，所研制的水泥浆的固井质量得到明显提高，可用于碳酸盐岩酸性气田固井，并能延长气井寿命。

关键词: 碳酸盐岩, 酸性气田, 固井, 水泥浆, 高温高压, 防腐, 防气窜

Abstract:

Difficulties are encountered in cementing the Longgang gas field in Sichuan Basin, primarily due to the lost circulation, long cementing section, super retarder induced by large temperature difference, high temperature and high pressure, and high content of acidic gases such as H₂S and CO₂. Then response strategies were proposed in accord with the cementing requirements of different casing programs. Through mechanism analysis and experimental comparison, three cement slurry systems were developed, i.e., the leak-proof toughening system, the salt-resistant system featuring large temperature difference, and the anti-corrosion system. Laboratory experiments showed that the fiber groups of different scales and elastic modulus prevented the propagation of micro-cracks and played a role in bridging the cracks in a network, thus effectively solving the lost circulation problem. The optimized organic acid and starchy composite retarder SD210 and the copolymeric salt-proof fluid loss agent SD130 were resistant to a high temperature of 160℃ and showed good anti-gas-channeling performance, thus helping to solve the “super retarder” problem in the 177.8mm liner cementing. Comparative analysis of the compressive strength and permeability of set cement before and after corrosion combined with X-Ray diffraction and scanning electron microscopy verified that it was feasible to enhance the anticorrosion effect of set cement by improving the density. Field application in the Longgang gas field showed that the prepared slurry systems were significantly improved in cementing quality, and were applicable for cementing carbonate acidic gas fields as well as prolonging the lifetime of gas wells.

Key words: carbonate rock, acidic gas field, cementing, cement slurry, high temperature and high temperature, anti-corrosion, anti-gas-channeling

程荣超严海兵汪海阁张富成王世永 . 碳酸盐岩油气藏高温防窜防腐固井技术[J]. 石油学报, 2012, 33(S2): 181-188.

CHENG Rongchao YAN Haibing WANG Haige ZHANG Fucheng WANG Shiyong . Anti-channeling and anti-corrosion cementing technology for carbonate reservoirs in high temperature[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(S2): 181-188.

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碳酸盐岩油气藏高温防窜防腐固井技术

Anti-channeling and anti-corrosion cementing technology for carbonate reservoirs in high temperature

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