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

周志刚

Zhou Zhigang

中石化胜利石油工程有限公司钻井工艺研究院, 山东东营 257017

Drilling Technology Research Institute, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257017, China

由于遥控变径稳定器存在状态信号不可靠的问题,导致该类稳定器的状态有时无法辨识.为了研究影响该类稳定器状态信号的相关因素,针对其结构特点,根据液体不可压缩和物体受力平衡原理,对该类稳定器在地面和井下两种环境下的变径动作进行了分析,并利用现场试验进行了部分验证.该类稳定器依据MWD仪器提供的井斜信号进行状态控制,并利用相邻两次开泵的泵压差值确定其工作状态.分析认为,该类稳定器内平衡活塞出现上限、下限位置对其变径动作行程有减小的作用.现场试验发现,该类稳定器状态转换遵循控制活塞伸出与平齐的循环规律,活塞伸出泵压大于活塞平齐泵压,相邻泵压绝对差值约1.0 MPa,该类稳定器状态由第二次开泵时的泵压值判断其工作状态.研究表明,该类稳定器内平衡活塞出现上限、下限位置会导致状态信号减弱或无信号;利用相邻两次开泵泵压差值确定其状态的方法可靠,可为地面遥控稳定器提供依据.

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.

国家科技重大专项"致密油藏开发钻井技术优化及集成"(编号:2015ZX05076-003)、中石化石油工程技术服务有限公司科研项目"新型遥控变径稳定器研制与应用"(编号:SG13-03K)资助.

https://doi.org/10.11911/syztjs.201503022