海洋工程装备与技术

海洋工程装备与技术 ›› 2017, Vol. 4 ›› Issue (5): 271-275.

• 海洋油气勘探开发技术与装备 • 上一篇    下一篇

深水钻井表层套管下深优化技术可行性分析

郝希宁， 孙丽丽， 殷志明， 王宇   

  1. 1.中海油研究总院，北京 100028；2.中国地质大学（北京）能源学院，北京 100083
  • 收稿日期:2017-01-17 出版日期:2017-10-25 发布日期:2017-10-31
  • 作者简介:郝希宁（1983—），男，工程师，主要从事深水钻完井井筒流动及控制方面的研究。
  • 基金资助:
    国家科技重大专项（2016ZX05028-001）；第七代超深水钻井平台（船）创新专项

Feasibility Analysis of Surface Casing Depth Optimization in Deepwater Drilling

HAO Xi-ning, SUN Li-li, YIN Zhi-ming, WANG Yu   

  1. 1. CNOOC Research Insititute, Beijing 100028, China; 2. School of Energy Resources, China University of Geosciences, Beijing 100083, China
  • Received:2017-01-17 Online:2017-10-25 Published:2017-10-31

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摘要： 深水表层套管的下入深度决定了套管鞋的承压能力和下一井段钻井作业的安全密度窗口，直接影响井身结构和套管层次。针对海外某深水区块上部井段井壁稳定性差、钻井复杂情况频发等问题，进行Pump & dump技术应用可行性分析，以增加表层无隔水管井段钻井深度，优化井身结构，降低作业工期和费用。通过水力学分析确定表层钻井所需钻井液体积等关键参数，并对钻井工期和费用进行对比，探索该技术应用于现场的可行性，为深水钻井降本增效提供新的思路和方法。研究表明，Pump & dump技术是增加表层钻井深度、优化井身结构切实可行的方法之一，每口井可节约费用上千万美元，建议在地层可钻性较好、表层套管增加下深不超过300 m的目标井中考虑使用。

Abstract: The strength of casing shoe and the drilling window of next section depend on the depth of shallow casing running, which influences the wellbore structure and casing level. According to the features of formation in an oversea deepwater block, in order to increase the depth of shallow casing and simplify the wellbore structure, the weighted drilling fluid is used to replace sea water for pump & dump drilling. The pump & dump drilling program and critical parameters are analyzed, so as to provide a new idea and method for reducing cost and improving efficiency in deepwater drilling. As the study shows, pump & dump is a good technology to increase shallow casing depth and optimize wellbore structure, which can reduce about $10M for a deepwater well. It is suggested to apply this technology to the deepwater well of which the drillability is good and the increasing depth of shallow casing is no more than 300 m.

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