Abstract Borehole quality is generally related to the "smoothness" of wellbore which manifests in a number ways, all tied efficiency drilling process and well completion cost. Presently, several parameters, such as tortuosity, curvature, torsion, various indices, are used quantify path or estimate difficulty smooth well. Furthermore, there no clear criterion for defining wellbore. Drilling indices describe hole more subjectively, rather than qualitatively. In some cases, they solely measure...

Some uncontrollable defects will occur on the surface of metal workpieces during processing. The existence not only affects appearance finished product, but also quality to a certain extent. Surface defect detection can effectively improve product and production efficiency, is an important link in process control. Although there are many different types methods, actual process, due characteristics multiple irregular distribution workpieces, most cases, manual inspection or simple machine...

Human activity recognition (HAR) based on wearable sensors has emerged as a low-cost key-enabling technology for applications such human–computer interaction and healthcare. In sensor-based HAR, deep learning is desired extracting human active features. Due to the spatiotemporal dynamic of activity, special network recognizing temporal continuous activities humans required improve accuracy supporting advanced HAR applications. To this end, residual multifeature fusion shrinkage (RMFSN)...

To solve the problem of borehole trajectory uncertainty, some methods such as error ellipsoid posture characterization, sectional ellipse solution and elliptic cylinder construction were proposed an application example was given. According to definition inclination, azimuth tool-face angle, a characterization method presented. By intercepting with arbitrary plane in space, general concept algorithm established analyze errors horizontal plane, plumb normal etc. Based on theory surface...

The well deviation equation of spatial-arc trajectory was established, the solution methods to determine posture inclined plane that lies on and extreme value inclination angle were presented, evolution pattern control mode for trajectories revealed. Some parameters can be calculated by forward model inverse respectively, including azimuth at any point along a trajectory, various with angle, results from are same as those model. There two points angles or its trendline, tangent lines...

To meet the wellbore trajectory control requirements for all kinds of steering drilling modes, directional deflection equations steerable tools and process method were proposed an application example was given. By proving that orientation direction tool consistent with principal normal borehole trajectory, established. establishing relation curves between build-up rate face angle, relationship built-up azimuth angle tool, a technique presented. The research shows determines curvature...

Abstract At present, low-cost Red Green Blue Depth (RGB-D) sensors are mainly used in indoor robot environment perception, but the depth information obtained by RGB-D cameras has problems such as poor accuracy and high noise, generated 3D color point cloud map low accuracy. In order to solve these problems, this article proposes a vision sensor-based generation algorithm for navigation. The aim is obtain more accurate through visual SLAM Kalman filtering visual-inertial navigation attitude...

Abstract All conventional methods for calculating the trajectory of a wellbore involve assumptions. Most calculations assume that segments can be approximated as straight lines, polygonal cylindrical helixes, circular arcs, or combination these approximations. Conventional calculate course coordinates well survey interval according to predetermined shape trajectory. But, what does real in each surveyed really look like? Why? What parameters play decisive roles determining true interval? Is...

Abstract Extended-reach drilling (ERD) technology has rapidly developed during the past two decades and of ultraextended-reach (u-ERD) wells to extend their reach greater depths requires improved models. Wellbore friction is an important issue for ultra-long wells, optimizing well path design effective means reducing torque drag. This paper presents dimensionless mathematical model provides a new method planning catenary profile. The does not involve hyperbolic functions uses exact solution....

Abstract Rotary-steerable technology is progressing rapidly all over the world because of improvements in hole cleaning and torque-and-drag. It works well especially extended-reach drilling holds great promise directional work. In rotary-steerable operations, bit walk objectively exists along an actual drilled trajectory. The experience shows that it effective measure to control a trajectory by use physical walk. authors developed method plan various bit-walk paths with any combination arc...

In order to accurately calculate drilled trajectories, the method of quantitatively recognizing borehole trajectory models was provided, and a case analysis conducted. Because measurement-while-drilling data provide with measured values tool-face angle besides inclination azimuth angle, this paper presents technological approach based on angle. A universal equation established directional deflection mechanism steerable drilling tools, it can angles characteristic parameters various models....

Pedestrian tracking is an important task in the field of computer vision and basis for other advanced tasks such as human pose estimation, motion recognition behavioural analysis, widely used emerging areas autonomous driving, intelligent security service robotics. The detection-based framework this paper relies heavily on pedestrian detection, excellent detection algorithms can significantly improve performance. To address problem poor accuracy presence small targets, occlusion congestion,...

New Techniques Improve Well Planning and Survey Calculation for Rotary-Steerable Drilling Xiushan Liu; Liu Sinopec Corp. Search other works by this author on: This Site Google Scholar Rushan Mingxin Sun Paper presented at the IADC/SPE Asia Pacific Technology Conference Exhibition, Kuala Lumpur, Malaysia, September 2004. Number: SPE-87976-MS https://doi.org/10.2118/87976-MS Published: 13 2004 Cite View Citation Add to Manager Share Icon Twitter LinkedIn Get Permissions Liu, Xiushan, Rushan,...

Abstract Accurate well-path planning is the prerequisite for operators to drill directional or horizontal wells successfully. During drilling operations, bit walk objectively exists along an actual drilled well trajectory. Drilling experience shows that it effective measure control a trajectory by taking physical into account if rate of can be accurately estimated. As planned results bit-walk path evidently reduce frequency azimuth correction and drilling-string trips, lessen difficulty...

Texture classification plays an important role for various computer vision tasks. Depending upon the powerful feature extraction capability, convolutional neural network (CNN)-based texture methods have attracted extensive attention. However, there still exist many challenges, such as of multilevel features and exploration multidirectional relationships. To address problem, this paper proposes compressed wavelet tensor attention capsule (CWTACapsNet), which integrates multiscale...

In this demonstration, we present an end-to-end assistive method for human body temperature screening system starting from collecting raw data using a thermal camera to identify the suspected individual combating communicable infectious diseases. We deploy lightweight MobileNet v2 in resource-constrained Raspberry Pi 4B detect human's head and image use classifier determine data. The experiments show that although detection accuracy is not very high, can reduce bottleneck time exposure...

In view of the problems existing in current wellbore positioning method, a true three-dimensional method was presented, and an example for analysis given. The uses grid north as reference datum to north, positions horizontal plane based on map projection coordinates, vertical direction elevation coordinates. It has inherent defects errors, two methods above are independent each other, only use constant meridian convergence magnetic declination at wellhead calculate borehole trajectory whole...