第39参第3期 2017年5月
石油钻采工艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号：10007393（2017）03031306
DOI:10.13639/j.odpt.2017.03.011
浮力作用对大斜度井套管居中度的影响
郑忠茂刘天恩”周宝义？张铁
Vol. 39 No. 3 May 2017
1.中国石沟集团游海钻探第二并公司；2.中国石油大港油田石油工程研究院；3.中国石油大港油田井下作业公司
引用格式：郑患茂，刘天恩，周宝义，张铁.浮力作用对大斜度并套管居中度的影响[J】.石油钻采工艺，2017,393)：313-318.
摘要：准确了解套管内外密度差所产生的浮力对套管居中度的影响对于大针度井合理安放扶正器，降低套管下入风险具有重要的意义。通过对扶正器受力分析模型进行修正，建立了套管内外密度差对套管居中度的影响图版，同时考虑项替过程中套管内外密度差随时间变化情况，形成理海油田大斜度并套管扶正器安放方法。计算结果表明，埕海地区扶正器安放间距分别为30m、20m、15m时，通过浮力作用使套管居中度最大可增加36.4%、19.6%、12.2%，井针角趋大、套管内外密度差越大，居中度变化值越大。扶正器安放间距为10m时，浮力作用减弱，居中度变化值最大仅为6.2%。研究结果表明，扶正器安放间距、井
作用的套管居中度设计方法，可以有效提高图并项替效率，保证套管安全下入
关键词：固井；大斜度井；下套管；浮力；并斜角；套管扶正器；居中度；埕海油田
中图分类号：TE256.2
文献标识码：A
Effect of buoyance on casing central degree of high angle deviated well
ZHENG Zhongmao',LIU Tianen',ZHOU Baovi',ZHANG Tie
1. No.2 Cementing Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China; 2. Petrolearm Engineering Research Jnsfitarte, PefroChina Dagang Oilfield Company, Tianjin 300280, China
3. Dowmhole Operation Company, PetroChina Dagang Oifield Company, Tianjin 300280, China
Citation: ZHENG Zhongmao, LIU Tianen, ZHOU Baoyi, ZHANG Tie. Effect of buoyance on casing central degree of high anglc deviated well [ J J . Oil Drilling & Production Technology, 2017, 39(3): 313-318
Abstraet: In order to install centralizers in high angle deviated wells rationally and decrease the risk of casing running, it is sig nificant to figure out accurately the effect of buoyance generated by the difference of density inside and outside the casing on the casing central degree. In this paper, the model for analyzing the forces on centralizers was modified and a chart describing the influence of den-sity difference between inside and outside the casing on the casing central degree was established. And the change of density difference between inside and outside the casing over the time in the process of displacement was also taken into consideration. Thus, the central-izer installation method for high angle deviated wells in Chenghai Oilfield was developed. Calculation results show that the maximum increment of casing central degree due to buoyance is 36.4%, 19.6% and 12.2% when the centralizer installation spacing in the area of Chenghai is 30 m, 20 m and 15 m. The higher the hole deviation angle is and the higher the density difference between inside and outside the casing is, the larger the variation of central degree is. When the centralizer installation spacing is 10 m, buoyance gets weak and maximum variation of central degree is only 6.2%. It is in nonlinear positive correlation of cubic polynomial between centralizer installation spacing, sine of hole deviation angle, density difference between inside and outside the casing and central degree variation
基金项目：中油股份公司重大科技专项“大港油区大沟田勘深开发关键技术研究"的子课题“高效钻完并及油气层保护配套技术研究”
(编号：2012E-10)
第一作者：郑患茂（1984-)），主要从事固并技术方面的研究工作，工程师。通议地址(300280)天津市大港油日红损路中段282号。E-mail:
27606-6164@q.com
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