An investigation of electromagnetic anti-collision real-time measurement for drilling cluster wells

Wu, Zhihui; Gao, Deli; Diao, Binbin

doi:10.1016/j.jngse.2015.02.016

Cited by 17 publications

(7 citation statements)

References 18 publications

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“…Therefore, it can be assumed that the probe tube stays approximately at the same point relative to adjacent casing when it makes a single turn. The relative distance between probe tube and casing is set to be 1 m, 2 m, 3 m, or 4 m, and the signal measured by the triaxial magnetometer is simulated by utilizing formula (14). Figure 6 indicates that the triaxial magnetometer detects the strongest magnetic flux density when the axis of the magnetic source points directly to the casing.…”

Section: Resultsmentioning

confidence: 99%

“…This principle is shown in Figure 1. Therefore, the total magnetic induction intensity as detected by a triaxial magnetometer is 0 when there is no casing around the probe tube or when the casing is far away from the probe tube [14]. When there is casing around the probe tube, the triaxial magnetometer data represent the sum of the geomagnetic field, the magnetic field of two magnetic sources, and the magnetic flux density of the magnetizing casing which generates a magnetic field along its axial direction (expressed as blue lines).…”

Section: Principle Of Active Magnetic Guidance Rangingmentioning

confidence: 99%

“…During the calculation process, the initial magnetic flux density of point can be calculated by using formula (14). Subsequently, the magnetic moment of the magnetic dipole can be calculated using formula (19).…”

Section: Calculation Of the Distance Between Adjacent Wellsmentioning

confidence: 99%

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Anticollision Method of Active Magnetic Guidance Ranging for Cluster Wells

Dou

Liang

Liu

2018

Mathematical Problems in Engineering

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Conventional adjacent wells range scanning calculations cannot meet the accuracy demands of the anticollision measurement of borehole distances any longer. Current techniques commonly employ electromagnetic detection tools while drilling; this requires putting equipment down adjacent wells to avoid collision risks, which adds more workload and costs and sometimes even affects the normal production of the producing wells. Measuring and tracking adjacent borehole distances while drilling is an essential process that guides the drill bit and effectively avoids collisions with existing wells. This paper proposes an active anticollision method of rotating magnetic ranging based on double symmetrical magnetic sources with opposite magnetic moments. First, the proposed method uses magnetic sources in the drilling well that are built into the probe tube to generate a magnetic field; then, the ferromagnetic casing of the existing well would be magnetized by the abovementioned magnetic field; finally, the magnetization field of the ferromagnetic casing is measured by a triaxial magnetometer built into the probe tube to determine the spacing and position of the existing well. Simultaneously, the calculation models of magnetic flux density around the casing of the existing well and magnetic sources are established, the calculation formulae of the relative distance and position of two adjacent wells are deduced, and a new variable interval section segmentation is proposed based on the Cosine theorem. The simulation results demonstrate that the spacing and position of the existing well are determined based on the magnetic sources’ spacing inside the probe, the magnetic moment of the magnetic sources, the relative permeability of the casing, the diameter of the casing, and the inclination between the drilling well and the existing well. The validity and accuracy of the active magnetization model are confirmed, providing theoretical support for the further development of electromagnetic anticollision devices.

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Section: Resultsmentioning

confidence: 99%

Section: Principle Of Active Magnetic Guidance Rangingmentioning

confidence: 99%

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Anticollision Method of Active Magnetic Guidance Ranging for Cluster Wells

Dou

Liang

Liu

2018

Mathematical Problems in Engineering

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“…During the drilling, if the well spacing d is constant, the rotating magnetization field detected at the measuring point (at the center of the compensation electromagnet coil) is stable, and the amplitude is constant [19]. With the increase or decrease of well spacing d, the rotating magnetization field becomes unstable and varies in a negative correlation, i.e., the amplitude decreases or increases accordingly [19]. Therefore, by observing the variation of the rotating magnetization field, the trend of the well spacing can be told.…”

Section: Modeling and Theoretical Derivationmentioning

confidence: 99%

Self-Excited Codirectionally Magnetically Compensated Rotating Ranging Method

Guo

Zhang

et al. 2020

Journal of Sensors

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During the Steam-Assisted Gravity Drainage (SAGD) technology-based dual horizontal well drilling process, it is necessary to accurately monitor the well spacing in real time to ensure safe and parallel drilling. In this paper, a self-excited codirectionally magnetically compensated rotating ranging method and device is proposed. In the numerical calculation and simulation, both parallel and nonparallel drilling models are established. Based on the models and the magnetic dipole theory, the relation between the magnetization field and the well spacing is analyzed. Furthermore, the one-to-one correspondence between the peak-to-peak value of the magnetization field and the well spacing is revealed. Well spacing is then determined according to the measured peak-to-peak value. To achieve better results, the influence of magnetic source (the magnetic moment) and casing characteristics (magnetic susceptibility, dynamic magnetization length) on measured peak-to-peak value is analyzed. Finally, field tests are carried out, and the feasibility and effectiveness of the theory and device are proved. This study provides innovation for a new approach of magnetic guidance while drilling and has a great significance in the development, testing, and calibration of well-ranging instruments.

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“…At present, a series of relatively mature active magnetic detection tools have been invented, such as the MGT electromagnetic guidance tool, the RMRS rotating magnetic field measuring guidance system, and the SWG single cable guidance tool [5][6][7][8]. Although some electromagnetic detection tools can be used to measure the distance of adjacent wells accurately, these tools require additional equipment such as magnetic sources or probes to be run in the adjacent wells [9][10][11]. But this not only affects the normal production of the wells but also increases the cost [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Measuring Algorithm Accuracy of the Electromagnetic Distance Measurement Anticollision Tool

Zhao

et al. 2022

Geofluids

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In order to prevent collision of complex structure well, accurate measurement of the distance of adjacent wells must be required during the development of the unconventional reservoir. The precision of the traditional survey tools and scanning software is not accurate enough. Based on the electromagnetic anticollision measuring calculation method, the electromagnetic anticollision detection tool was designed and simulation experiments were carried out. The influence of different position relations between sensor and casing on magnetic field strength detected by the sensor was analyzed. When the sensor and the casing were parallel and the distance of them was 0.5 m∼3 m, the tool could calculate accurately the distance and orientation of the adjoining well. When the angle between the sensor and the casing was within 50°, the calculation result was accurate. This research result validated the accuracy of the principle of the electromagnetic anticollision tool while drilling cluster well, and it could provide theoretical support for the development of electromagnetic detection tools.

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An investigation of electromagnetic anti-collision real-time measurement for drilling cluster wells

Cited by 17 publications

References 18 publications

Anticollision Method of Active Magnetic Guidance Ranging for Cluster Wells

Anticollision Method of Active Magnetic Guidance Ranging for Cluster Wells

Self-Excited Codirectionally Magnetically Compensated Rotating Ranging Method

Experimental Study of Measuring Algorithm Accuracy of the Electromagnetic Distance Measurement Anticollision Tool

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