scholarly journals Method of Real-Time Wellbore Surface Reconstruction Based on Spiral Contour

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 291
Author(s):  
Hongqiang Li ◽  
Ruihe Wang
Keyword(s):  
Surface Structure ◽  
Real Time ◽  
Surface Reconstruction ◽  
Three Dimensional ◽  
Measurement Data ◽  
Surface Profile ◽  
Contour Line ◽  
Actual Measurement ◽  
Iterative Interpolation ◽  
Reconstructed Surface

A wellbore surface is an irregular surface structure. The distribution of points on the wellbore surface measured based on the drilling diameter is not uniform. Thus, the conventional modeling method based on a point cloud cannot satisfy the needs of real-time measurement updating and wellbore display. This study proposes a spiral profile method for drilling shaft surface reconstruction. Scattered data along the drilling diameter are measured, and an inverse distance weighting cylindrical space surface algorithm with iterative interpolation is used to obtain the spiral angle and pitch of a relatively homogeneous helical contour line along the surface of the shaft. Using sets of four adjacent points in the spiral, quadrilaterals are formed, and then all obtained quadrilaterals are used to form the wellbore inner surface structure. This method can further construct the outer surface spiral contour line to advance the quadrilateral surface to the spatial hexahedron structure. The caliper and gamma measurement data obtained from the calibrated wellbore were used to verify the real-time surface reconstruction and fusion while drilling. The homogenized reconstructed surface profile is more than 99.5% similar to the actual measurement. Proved by experiment and application, this method has very high real-time performance, and the three-dimensional stereo imaging wellbore with additional gamma attributes has good visual effects.

Dynamic Measurement of Spatial Attitude at Bottom Rotating Drillstring: Simulation, Experimental, and Field Test

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Qilong Xue ◽  
Ruihe Wang ◽  
Baolin Liu ◽  
Leilei Huang
Keyword(s):  
Real Time ◽  
Measurement Errors ◽  
Time Window ◽  
Measurement Data ◽  
Movement Patterns ◽  
Dynamic Measurement ◽  
Drilling Process ◽  
Stick Slip ◽  
Actual Measurement ◽  
Gas Drilling

In the oil and gas drilling engineering, measurement-while-drilling (MWD) system is usually used to provide real-time monitoring of the position and orientation of the bottom hole. Particularly in the rotary steerable drilling technology and application, it is a challenge to measure the spatial attitude of the bottom drillstring accurately in real time while the drillstring is rotating. A set of “strap-down” measurement system was developed in this paper. The triaxial accelerometer and triaxial fluxgate were installed near the bit, and real-time inclination and azimuth can be measured while the drillstring is rotating. Furthermore, the mathematical model of the continuous measurement was established during drilling. The real-time signals of the accelerometer and the fluxgate sensors are processed and analyzed in a time window, and the movement patterns of the drilling bit will be observed, such as stationary, uniform rotation, and stick–slip. Different signal processing methods will be used for different movement patterns. Additionally, a scientific approach was put forward to improve the solver accuracy benefit from the use of stick–slip vibration phenomenon. We also developed the Kalman filter (KF) to improve the solver accuracy. The actual measurement data through drilling process verify that the algorithm proposed in this paper is reliable and effective and the dynamic measurement errors of inclination and azimuth are effectively reduced.

Surface Reconstruction from Unorganized Points Using Graph Cut

2012 ◽  
Vol 476-478 ◽  
pp. 587-591
Author(s):  
Xiao Ming Wang ◽  
Li Min Shi
Keyword(s):  
Surface Reconstruction ◽  
Delaunay Triangulation ◽  
Input Data ◽  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Graph Cut ◽  
Reconstructed Surface

A new surface reconstruction algorithm is presented for unorganized 3D points in this work. By properly building a graph, the surface is shown to correspond to the minimum s-t cut of the graph. In addition, since our proposed algorithm is based on the three dimensional Delaunay triangulation, it is guaranteed the reconstructed surface is composed by the patches with fine shapes in the Delaunay tetrahedra. Besides, the reconstructed surface can interpolate the input data and can also decimate the outliers automatically through proper adjusting the parameters. The experiments indicate our algorithm is practical and easy to implement.

scholarly journals Research on the Three Dimensional Detection Technology for Magnetic Sheet in Industrial Production

2015 ◽  
Vol 9 (1) ◽  
pp. 585-593
Author(s):  
Wenbo Zhang ◽  
Chuo Yang ◽  
Yongxin Feng ◽  
Deyu Zhang
Keyword(s):  
Edge Detection ◽  
Detection System ◽  
Three Dimensional ◽  
Measurement Data ◽  
Surface Profile ◽  
Noise Interference ◽  
Image Edge Detection ◽  
Detection Technology ◽  
Measurement Function ◽  
Image Edge

This study proposes a three-dimensional size detection system for inerratic magnetic sheets according to specific size parameter requirements, such as the volume of the industrial micro magnetic sheet. Based on the noise interference generated by the corresponding detection environment of the magnetic sheet, a hybrid filtering method for the inerratic magnetic sheet is also proposed here, which effectively implements denoising filtering. In the image edge detection module, the edge detection operator most suitable for detecting image edge extraction is selected, and in order to realize the inerratic shape detection in Hough transform, the measurement function of size parameters (including the top surface radius, tilt angle of the profile and top surface, profile thickness, and volume) for the micro cylinder magnetic sheet are designed and implemented. Measurement data, gathered through repeated experiments, builds a more effective detection system for magnetic sheet size than traditional methods at the millimeter level.

scholarly journals Indoor Millimeter-Wave Propagation Prediction by Measurement and Ray Tracing Simulation at 38 GHz

Symmetry ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 464 ◽  
Author(s):  
Ferdous Hossain ◽  
Tan Geok ◽  
Tharek Rahman ◽  
Mhd Hindia ◽  
Kaharudin Dimyati ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Millimeter Wave ◽  
Three Dimensional ◽  
Measurement Data ◽  
Path Loss ◽  
Actual Measurement ◽  
Measurement Output ◽  
Sbr Method ◽  
Propagation Prediction ◽  
Ray Tracing Simulation

The Millimeter-Wave (mmW) technology is going to mitigate the global higher bandwidth carriers. It will dominate the future network system by the attractive advantages of the higher frequency band. Higher frequency offers a wider bandwidth spectrum. Therefore, its utilizations are rapidly increasing in the wireless communication system. In this paper, an indoor mmW propagation prediction is presented at 38 GHz based on measurements and the proposed Three-Dimensional (3-D) Ray Tracing (RT) simulation. Moreover, an additional simulation performed using 3-D Shooting Bouncing Ray (SBR) method is presented. Simulation using existing SBR and the proposed RT methods have been performed separately on a specific layout where the measurement campaign is conducted. The RT methods simulations results have been verified by comparing with actual measurement data. There is a significant agreement between the simulation and measurement with respect to path loss and received signal strength indication. The analysis result shows that the proposed RT method output has better agreement with measurement output when compared to the SBR method. According to the result of the propagation prediction analysis, it can be stated that the proposed method’s ray tracing is capable of predicting the mmW propagation based on a raw sketch of the real environment.

New Digital Method of Reverse Engineering about Free from Surface

2011 ◽  
Vol 295-297 ◽  
pp. 1065-1069 ◽  
Author(s):  
Xue Ming He ◽  
Ying Xue ◽  
Cheng Gang Li ◽  
Chen Liang Hua ◽  
Yi Lu
Keyword(s):  
Reverse Engineering ◽  
Real Time ◽  
Surface Reconstruction ◽  
Closed Loop ◽  
Measuring Method ◽  
Loop System ◽  
Reconstruction Method ◽  
Closed Loop System ◽  
Reconstructed Surface ◽  
Time Update

In this paper, it is proposed a new method of free-from surface’s reverse engineering, making data acquisition and surface reconstruction form closed loop system, solving no feedback problems in the measuring and modeling process, shortening the time of the whole reverse engineering, improving the quality of reconstructed models. The core of this paper is used the CMM adaptive measuring method and non-uniform b-spline surface reconstruction method, integrating the free-from surface measuring and modeling in a closed loop system, realizing the CMM real-time online measurement and reconstructed surface real-time update.

Surface Reconstruction of Microscale Objects Based on Grid-Patterned Structured-Light Measurements

2021 ◽  
pp. 1-21
Author(s):  
Yuezong Wang ◽  
Jiqiang Chen ◽  
Youfan Peng
Keyword(s):  
Real Time ◽  
Surface Reconstruction ◽  
Metal Surfaces ◽  
Structured Light ◽  
Three Dimensional ◽  
Shape Measurement ◽  
Grid Node ◽  
Projection System ◽  
3D Shape ◽  
3D Shape Measurement

A structured-light projection system was designed for microscale objects with surface heights that ranged from tens to hundreds of microns. The system was composed of a universal projector and microscope system that supported editing the attributes of structured-light patterns in real-time and was capable of projecting microscale patterns. On this basis, reconstructing the metal surfaces of microscale objects based on grid patterns of structured light was investigated, the internal and external parameters of microscope vision and projection systems were calibrated, and an image algorithm for grid-node detection was designed. The results indicated that the proposed method successfully reconstructed the three-dimensional (3D) surface of microscale objects, and the reconstruction results were consistent with the original surfaces. With 95% confidence, the reconstruction precision in the X- and Y-directions was approximately ±4.0 μm and in the Z-direction was approximately ±7.5 μm. The designed system and the proposed method were suitable for 3D-shape measurement of microstructures in microscopic fields and can be adapted to meet a broader range of applications, as compared to current methods.

SURFACE RECONSTRUCTIONS ON GOLD IN CONTACT WITH SOLUTION

1997 ◽  
Vol 04 (06) ◽  
pp. 1375-1379 ◽  
Author(s):  
S. M. THURGATE ◽  
T. NAUMOVSKI ◽  
P. HALE ◽  
K. FINLAYSON
Keyword(s):  
Surface Structure ◽  
Recent Work ◽  
Surface Reconstruction ◽  
Surface Reconstructions ◽  
Reconstructed Surface

The low index planes of Au display a number of reconstructions when prepared in vacuum. UHV studies have established that the (100) surface relaxes to a (1×1) surface structure with the adsorption of very small amounts of ad-atoms. This (1×1) surface has been referred to as a metastable surface, and it quickly reverts to the reconstructed surface on heating to mild temperatures (200°C) in vacuum. Early reports indicated that this surface also reverted to a (1×1) if brought into contact with water, though more recent work suggests that this is not necessarily the case. We have just completed construction of a UHV system, equipped with AES, LEED and STM, designed to track changes in surface structure due to reactions in solution. The sample can be brought into contact with a solution without exposure to air, and we have used this to study the effect of exposing the (100) and (110) surfaces of Au to pure H2O . The LEED and STM measurements from these surfaces suggest that they revert to the (1×1), even though the AES indicates that the surface is clean. Whether or not the surface reconstruction is induced by contact with water and not the adsorption of very small amounts of specific ions which are subsequently desorbed, is however, not resolved by these experiments.

Estimation of Mean Trace Length Based on Trace Maps Measured by GPS-RTK

2014 ◽  
Vol 638-640 ◽  
pp. 2141-2145 ◽  
Author(s):  
Jian Zheng ◽  
Yang Song Zhang ◽  
Xing Xi Shi ◽  
Xiao Zhao Li
Keyword(s):  
Real Time ◽  
Three Dimensional ◽  
Measurement Data ◽  
Reference Value ◽  
Trace Length ◽  
Digital Terrain ◽  
Real Time Kinematic ◽  
Gps Rtk ◽  
The Mean ◽  
Trace Maps

Based on measurement data acquired by GPS-RTK (Real Time Kinematic) technology, this paper established a three-dimensional traces model on digital terrain. Then Zhang and Einstein method and H-H method were chosen to estimate the mean trace length of discontinuities. The results using these two methods are both very close to the reference value. It shows the feasibility of these methods and the rules for setting digital windows in this case.

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