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Underground localization is considered a key technology for controlling underground equipment, such as directional drilling equipment. However, most sensors for localization such as vision sensors, range sensors, and wireless sensors cannot be utilized in an underground environment. Moreover, vibration by the drill bit and distortion of the geomagnetic field by the surrounding material adversely affect...
Underground localization is widely used for the directional drilling due to advances in the unconventional resources. To mitigate the accumulated errors, a novel underground localization algorithm using re-measurement of the magnetic field and graph SLAM (simultaneous localization and mapping) was proposed. However, since the penetration length of the drilling device is very long, the real-time localization...
As the conventional resource drains, the importance of unconventional resource grows. A directional drilling system and a hydraulic fracturing method are required to gain unconventional resources. Nowadays, the key technology of the directional drilling is a rotary steerable system (RSS). Among several types of the RSS developed so far, ‘point-the-bit’ and ‘push-the-bit’ are the most commonly used...
As the importance of unconventional resource grows, the demand for the directional drilling technology is increasing. One of the key technologies of the directional drilling is a rotary steerable system (RSS). Among several types of RSS developed so far, ‘point-the-bit’ and ‘push-the-bit’ are the most commonly used ones. In this paper, a new rotary steerable system using hybrid 4-pad system is introduced...
In this paper we present a method for solving an indoor relocation problem using ambient magnetic fields and radio sources. Specifically, we exploit the magnetic field anomalies and noisy radio ranges in indoor environments. A robot with two magnetometers and one active radio range sensor first explores the unknown environment based on the SLAM technique, gathering its path and some useful multisensory...
Recently, shale gas has become an important energy source. Directional drilling is an imperative technology when it comes to excavating shale gas because it exists in underground in horizontally spaced areas. A rotary steerable system (RSS) enables the effective directional drilling. In general, there are two types of RSS, the point-the-bit and the push-the-bit. In this paper, a new hybrid type RSS...
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