Dead Reckoning Method for Tracking Wellbore Trajectories Constrained by the Drill Pipe Length

IF 5.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Instrumentation and Measurement Pub Date : 2024-10-30 DOI:10.1109/TIM.2024.3488150
Shaowen Ji;Chunxi Zhang;Longjie Tian;Longjun Ran;Yanqiang Yang
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Abstract

Two key factors for calculating the trajectory of a wellbore are the attitude and interval of the survey stations. A measurement while drilling (MWD) system that relies on magnetometers and accelerometers may fail to measure the wellbore attitude in an environment with magnetic anomalies. In addition, in the case of a wellbore trajectory with large variations in the attitude, the commonly used minimum curvature method (MCM) can result in large deviations from the planned wellbore trajectory. In this study, a novel dead reckoning (DR) method was developed that is constrained by drill pipe length subdivisions for improved tracking accuracy of wellbore trajectories with a large variety of attitudes. A gyro MWD system based on fiber optic gyroscopes (FOGs) and accelerometers is utilized to continuously calculate the wellbore attitude. The variations in the attitude angle within the wellbore can be tracked by using the proportional relationship between increments in the attitude and drill pipe length subdivisions, which can be synchronized with the gyro MWD update frequency. Simulations and experiments were performed to verify that the proposed method could accurately track wellbore trajectories with large variations in the attitude. In the simulation, the proposed method demonstrated a mean trajectory deviation of less than 0.5 m over a distance of 30 m, which was markedly lower than the mean deviation of 2.5 m by the MCM. In the slope experiment, the proposed method demonstrated substantially better tracking accuracy of the wellbore trajectory than the MCM. Measurements from an actual wellbore with large variations in the attitude confirmed that the proposed method reduced the tracking error by up to 3 m compared to the MCM.
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受钻杆长度限制的井筒轨迹跟踪死循环法
计算井筒轨迹的两个关键因素是测量站的姿态和间隔。依靠磁力计和加速度计的钻井同时测量(MWD)系统可能无法在磁场异常的环境中测量井筒姿态。此外,在井筒轨迹姿态变化较大的情况下,常用的最小曲率法(MCM)可能会导致与计划井筒轨迹出现较大偏差。在这项研究中,开发了一种新型的死点推算 (DR) 方法,该方法受钻杆长度细分的限制,可提高对各种姿态的井筒轨迹的跟踪精度。基于光纤陀螺仪(FOG)和加速度计的陀螺 MWD 系统用于连续计算井筒姿态。利用姿态增量与钻杆长度分段之间的比例关系,可以跟踪井筒内姿态角的变化,这可以与陀螺 MWD 更新频率同步。通过模拟和实验验证了所提出的方法能够准确跟踪姿态变化较大的井筒轨迹。在模拟实验中,建议的方法在 30 米距离内的平均轨迹偏差小于 0.5 米,明显低于 MCM 的 2.5 米平均偏差。在斜坡实验中,拟议方法对井筒轨迹的跟踪精度大大高于 MCM。对姿态变化较大的实际井筒进行的测量证实,与 MCM 相比,提议的方法最多可将跟踪误差减少 3 米。
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来源期刊
IEEE Transactions on Instrumentation and Measurement
IEEE Transactions on Instrumentation and Measurement 工程技术-工程:电子与电气
CiteScore
9.00
自引率
23.20%
发文量
1294
审稿时长
3.9 months
期刊介绍: Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications. The scope of these papers may encompass: (1) theory, methodology, and practice of measurement; (2) design, development and evaluation of instrumentation and measurement systems and components used in generating, acquiring, conditioning and processing signals; (3) analysis, representation, display, and preservation of the information obtained from a set of measurements; and (4) scientific and technical support to establishment and maintenance of technical standards in the field of Instrumentation and Measurement.
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