﻿ 遥控变径稳定器变径动作分析及现场试验

Analysis and Field Testing by Remote Control of the Action of a Variable Diameter Stabilizer
Zhou Zhigang
Drilling Technology Research Institute, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257017, China
Abstract:The remote-control variable diameter stabilizer developed is unreliable in the state signal,resulting in the fact that its state cannot be identified.In order to identify relevant factors affecting the state signal,the stabilizer action was analyzed for changing its diameter under both surface and downhole conditions based on the principle of liquid incompressibility and force equilibrium.Later,combined with its structural characteristics,the result of the analysis was partially verified by field test.The stabilizer can achieve state control by using well deviation signal from the MWD instrument and determine the working state by analyzing the pump pressure difference between two adjacent pump startups.The result of the analysis suggested that the upper and lower position limits of balance piston inside the stabilizer can reduce the action stroke for changing diameter.The field test showed that the state change of the stabilizer conforms to the changing regularity of controlling piston extension and alignment,the pump pressure on piston extension is higher than that of piston alignment,and the absolute difference of adjacent pump pressure is about 1.0 MPa.The working state of the stabilizer can be determined based on the pump pressure value of the second pump startup.The research results showed that,the upper and lower limits of the balance piston position inside the stabilizer would result in a weak state signal or no signal.The method to determine the stabilizer state according to pressure difference between two adjacent pump startups is reliable,and can provide the basis for remote control of stabilizer on the ground.
Key words: remote control    variable diameter stabilizer    hole trajectory    state signal

1 遥控变径稳定器结构及工作原理 1.1 遥控变径稳定器的结构

 图1 遥控变径稳定器基本结构 Fig.1 Structure for a remote control variable diameter stabilizer 1.本体；2.上心轴；3.复位弹簧；4.斜面块；5.扶正活塞；6.控制器； 7.加油塞孔；8.下心轴；9.平衡活塞；10.环空孔；11.压差活塞；12.节流杆
1.2 遥控变径稳定器的工作原理

2 遥控变径稳定器变径动作分析 2.1 稳定器的状态信号

 图2 稳定器内部结构及不同状态下充油腔容积的变化 Fig.2 Internal structure of stabilizer and the change of oil-filled chamber volume in different states 1.复位弹簧；2.扶正活塞；3.加油塞孔； 4.充油腔1和2间的通道；5.平衡活塞；6.环空孔
2.2 稳定器变径动作分析

2.2.1 充油腔容积的变化

2.2.2 上下限位置稳定器变径动作分析

 图3 限位位置受力分析示意 Fig.3 Diagram for force analysis in the limited position of balance piston
2.2.2.1 上限位置稳定器变径动作分析

2.2.2.2 下限位置稳定器变径动作分析

2.3 异常变径动作对状态信号的影响

3 遥控变径稳定器现场试验

3.1 井口试验和井下试验

3.1.1 井口试验1

 图4 井口试验某相邻两次开泵泵压曲线1 Fig.4 Pump pressure curve 1 of two adjacent pump startups at wellhead test
3.1.2 井口试验2

 图5 井口试验某相邻两次开泵泵压曲线2 Fig.5 Pump pressure curve 2 of two adjacent pump startups at wellhead test
3.1.3 井下试验

 图6 井下试验某相邻两次开泵泵压曲线 Fig.6 Pump pressure curves of two adjacent pump startups in downhole test
3.2 试验数据分析

4 结论与建议

1) 遥控变径稳定器内平衡活塞出现上限、下限位置，对稳定器的变径动作行程有减小的作用，是导致状态信号减弱或无信号的因素。

2) 遥控变径稳定器同正脉冲MWD仪器配合使用，在各自的动作和信号上相互无影响。

3) 利用相邻再次开泵泵压差值确定稳定器状态的方法可靠，可为地面遥控稳定器提供依据。

4) 遥控变径稳定器是钻井中控制井眼轨迹的重要工具，在国内旋转导向技术还不是特别成熟的工程背景下，建议加强延长该工具工作寿命和提高其可靠性的研究，并将其进行系列化。

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#### 文章信息

Zhou Zhigang

Analysis and Field Testing by Remote Control of the Action of a Variable Diameter Stabilizer

Petroleum Drilling Techniques, 2015, 100(03): 120-124.
http://dx.doi.org/10.11911/syztjs.201503022