Development of Static Magnetic Detection Anti-Collision System While Drilling

Diao, Binbin; Gao, Deli; Li, Genkui

doi:10.2991/aiea-16.2016.96

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…When the twin parallel wells are approximate parallel, well spacing is the distance between the two peaks of z axis magnetic component. And calculating formula for the parameters are available, shown as formula (7), (8).…”

Section: Mathematical Model Of Magnetic Field Orientation Methodsmentioning

confidence: 99%

“…When the two horizontal wells are not parallel, spatial location relationship of the two wells can be decomposed into two cases, one is well trajectories convergence/divergence and another is well trajectories in different planes (figure 4). Use the angle xu A and yv A to stand for them [8]. In the actual drilling process, the two well trajectories will exist a convergence/divergence and different angle at the same time typically.…”

Section: Mathematical Model Of Magnetic Field Orientation Methodsmentioning

confidence: 99%

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Orientation Method Simulation in Twin Parallel Horizontal Wells

Liu

Shi

Liu³

2014

AMM

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As traditional measurement while drilling (MWD) method cannot meet the high reliability, high precision requirements for drilling complex structure wells. A guided-orientation method based on rotating magnetic field has prominent advantages on the twin parallel horizontal wells and can apply in twin parallel horizontal wells. In this paper, RMRS, namely Rotating Magnet Ranging system, its operating principle was gave firstly while applied for drilling twin parallel horizontal wells. The rotating magnetic sub was characterized by a pair of orthogonal magnetic dipoles, and then build the model for positioning the twin parallel horizontal wells Finally, the authors used the Maxwell software to simulate the algorithm based on the scene environment, and then proves that algorithm is correct and useful for guiding the well to drill and keeping the twin wells parallel.

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Section: Mathematical Model Of Magnetic Field Orientation Methodsmentioning

confidence: 99%

Section: Mathematical Model Of Magnetic Field Orientation Methodsmentioning

confidence: 99%

Orientation Method Simulation in Twin Parallel Horizontal Wells

Liu

Shi

Liu³

2014

AMM

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A Method for Ranging and Positioning Casing with High-Intensity Magnets: Simulations and Experimental Studies

2023

SPE Journal

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Summary Wellbores in the upper vertical section of cluster wells are typically positioned close together, resulting in a high possibility of wellbore collision accidents. In the drilling process, accurately determining the distance and bearing of the casings of adjacent production wells is key to controlling the wellbore trajectory to avoid collision accidents. In this study, a method is proposed that uses a high-intensity magnet to magnetize a close-range casing and subsequently measures the axial forces on the magnet to determine the casing distance and positioning. Based on the theoretical analysis of the magnet’s force, the boundary finite element method is used to numerically analyze the influence of the casing position on the magnet. The force on the magnet decreases exponentially with the increase in casing distance and decreases nonlinearly and rapidly as the angle increases. A method to determine the position of a casing by analyzing the forces on two adjacent magnets is proposed. Based on the fitting of the simulation results, a mathematical model that calculates the casing distance and azimuth is established. A simple experimental device was designed to verify the reliability of the numerical simulations and casing ranging and positioning of the models. The maximal calculation error of the casing distance is determined at 5 mm, and the angle error is less than 2°. Moreover, the actual measured distance is less than 1 m. The angle between the axes of the high-intensity magnets has an important influence on the distance measurement range. The following steps are suggested to improve the detection range of the casing: Improve the remanence of the high-intensity magnet; extend the length of the force arm of the force measuring mechanism; apply a high-resolution torque sensor; and set a smaller angle between the axes of the high-intensity magnets. The proposed method can achieve high-efficiency measurements and calculations of the casing distance and bearing based on a simple measurement structure and low-cost manufacturing. It also has the potential to be applied to multiple short-range casing ranging and positioning scenarios.

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