定向钻井中托压机理分析及对策探讨

薄玉冰

doi:10.11911/syztjs.201701005

定向钻井中托压机理分析及对策探讨

doi: 10.11911/syztjs.201701005

薄玉冰

中石化胜利石油工程有限公司钻井工程技术公司, 山东东营 257064

详细信息

作者简介:
薄玉冰(1988-),男,山东东营人,2012年毕业于长江大学石油工程专业,助理工程师,主要从事定向井钻井技术研究与现场施工。

中图分类号: TE921
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出版历程
- 收稿日期: 2016-04-21
- 修回日期: 2016-12-27
- 刊出日期: 1900-01-01

The Formation Mechanism and Technical Countermeasures for Back Pressure during Directional Drilling

Bo Yubing

Drilling Engineering and Technology Company, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257064, China

摘要

摘要: 为了解决定向钻井过程中的托压问题，通过分析下部钻具组合的受力，研究了托压产生的机理，并分析了影响托压的主要因素，给出了主要技术对策。分析研究表明，托压主要是由钻柱与井壁之间的摩擦阻力造成的，其影响因素主要包括井眼轨迹、井眼清洁程度、钻具组合、钻井液的润滑性及地层类型等。控制托压的技术对策包括优化井眼轨道和钻具组合、提高井眼清洁程度和钻井液的润滑性及采用改善托压的井下工具等，并介绍了控制托压技术措施在D15-X14井和Y123-5HF井的应用情况。研究与应用表明，控制托压的技术对策具有较强的针对性，不但能有效降低托压的频率与程度，而且能有效提高机械钻速，能够为定向钻井提供指导和借鉴。
- 定向井 /
- 托压 /
- 摩阻 /
- 井眼轨道 /
- 钻具组合
Abstract: In order to solve the problem of back pressure during directional drilling,the mechanism by which it occurs was investigated by analyzing the force on the bottom hole assembly (BHA).Then,the main factors affecting back pressure were explored,and accordingly primary technical countermeasures were proposed.It was shown that the back pressure was mainly caused by friction resistance between drillstrings and borehole wall,and it was dominantly affected by wellbore trajectory,downhole cleaning,BHA,drilling fluid lubricity and formation types.It was proposed to control the back pressure by optimizing wellbore trajectory and BHA,increasing downhole cleaning and drilling fluid lubricity,and adopting down hole tools which could reduce back pressure.And finally,the application of back pressure controlling measures in Wells D15-X14 and Y123-5HF were introduced.It was indicated that these technical countermeasures for back pressure control were more effective.Based on these countermeasures,the frequency and degree of back pressure decreased significanlty and the rate of penetration(ROP)also increased.The research results provided the reference and basis for the directional drilling.
- directional well /
- back pressure /
- friction resistance /
- wellbore trajectory /
- bottom hole assembly

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