﻿ 连续管可控偏心垫块BHA滑动钻进导向性能分析

1. 石油工程教育部重点实验室(中国石油大学(北京)), 北京 102249;
2. 中国石油新疆油田分公司, 新疆克拉玛依 834000

Steering Performance Analysis on BHA with Controllable Eccentric Telescopic Blocks in Coiled Tubing Drilling
FANG Jun1, HAN Xiaofei1, WANG Yanbin1, XIONG Chao2
1. MOE Key Laboratory of Petroleum Engineering(China University of Petroleum(Beijing)), Beijing, 102249, China;
2. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, China
Abstract: In order to meet the requirement of steering control during drilling horizontal slim hole by coiled-tubing, a new method was proposed to control the wellbore trajectory by using controllable eccentric telescopic blocks. The bottom hole assembly (BHA) was equipped with independently controllable eccentric telescopic blocks that can be controlled for extension and retraction to generate displacement of BHA against the borehole axis, so as to change the mechanical properties of BHA. Based on the proposed BHA, a mechanical model and control equation were established to analyze steering performance of the coiled-tubing BHA with eccentric telescopic blocks by means of beam-column theory, and the solution for the specific cases was given by using the control equation. The calculation results showed that the bit drift force, azimuth force and its rotation angle within the inclination plane and azimuth plane are linearly related to the eccentric displacement of eccentric stabilizers at different WOBs. With the increase of the inner diameter of drill collars, the drift force and the azimuth force of bits decreased in cubic polynomial form, but the angle of bit rotation changed very slightly. It is shown that the mechanical properties of BHA can be changed by controlling the extension or retraction of the eccentric blocks by which the eccentric displacement of BHA produced against the borehole axis, so as to control the well trajectory.
Key words: coiled-tubing drilling    eccentric telescopic block    wellbore trajectory    bottom hole assembly    beam-column theory

1 可控偏心垫块BHA组成及工作原理

 图1 小井眼连续管钻井下部钻具组合 Fig.1 Bottom hole assembly with coiled-tubing for drilling slim hole 1.钻头；2.动力钻具；3.可控偏心垫块短节；4.MWD/LWD短节； 5.转向器短节；6.钻铤；7.爬行器；8.连续管； 9.方位平面偏心垫块；10.井斜平面偏心垫块

2 力学模型

 图2 井斜平面与方位平面内BHA力学分析模型 Fig.2 Mechanical analysis model for BHA within the inclination plane and azimuth plane
2.1 井斜平面(Oyz平面)力学分析

2.2 方位平面(Oxz平面)力学分析

3 算例分析与讨论

3.1 井斜平面内导向性能分析

 图3 不同钻压下井斜平面内钻头井斜力与偏心位移的关系 Fig.3 The relationship between bit drift force and eccentric displacement within inclination plane at different WOB
 图4 不同钻压下井斜平面内钻头转角与偏心位移的关系 Fig.4 The relationship between angle of bit rotation and eccentric displacement on inclination plane at different WOB

3.2 方位平面内导向性能分析

 图5 不同钻压下方位平面内钻头方位力与偏心位移的关系 Fig.5 The relationship between eccentric displacement and bit azimuth force within azimuth plane at different WOB
 图6 不同钻压下方位平面内钻头转角与偏心位移关系 Fig.6 The relationship between eccentric displacement and angle of bit rotation within azimuth plane at different WOB

3.3 钻铤内径对导向性能的影响

 图7 井斜平面内钻头井斜力和转角与钻铤内径的关系 Fig.7 The relationship among inner diameter of drill collars, bit drift force and angle of bit rotation within inclination plane
 图8 方位平面内钻头方位力和转角与钻铤内径的关系 Fig.8 The relationship among inner diameter of drill collars, bit azimuth force and angle of bit rotation within azimuth plane

4 结论

1)可控偏心垫块按照一定的规律安装在连续管钻井的BHA上，可以独立伸出与缩回，使BHA产生相对于井眼轴线的偏心位移，达到控制井眼轨迹的目的。

2)理论分析表明，该钻具组合滑动钻进时，钻头井斜力、方位力及钻头转角均随偏心位移的增大而增大，随钻铤内径的增大而减小，井斜平面内的钻头转角随钻铤内径增大而增大，方位平面内的钻头转角随钻铤内径增大而减小。

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#### 文章信息

FANG Jun, HAN Xiaofei, WANG Yanbin, XIONG Chao

Steering Performance Analysis on BHA with Controllable Eccentric Telescopic Blocks in Coiled Tubing Drilling

Petroleum Drilling Techniques, 2016, 44(1): 44-48.
http://dx.doi.org/10.11911/syztjs.201601009