scholarly journals Acoustic source characterization for a logging while drilling tool: Theoretical and experimental modeling

2018 ◽  
Vol 144 (3) ◽  
pp. EL178-EL184 ◽  
Author(s):  
Song Xu ◽  
Chunxi Zhuang ◽  
Yuanda Su ◽  
Yukai Liu ◽  
Zhengpeng Zhang ◽  
...  
Keyword(s):  
Experimental Modeling ◽  
Source Characterization ◽  
Acoustic Source ◽  
Drilling Tool ◽  
Logging While Drilling

scholarly journals Design of a New Acoustic Logging While Drilling Tool

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4385
Author(s):  
Kai Zhang ◽  
Baohai Tan ◽  
Wenxiu Zhang ◽  
Yuntao Sun ◽  
Jian Zheng ◽  
...  
Keyword(s):  
Impedance Matching ◽  
Sine Wave ◽  
Azimuthal Anisotropy ◽  
Dipole Source ◽  
Pulse Excitation ◽  
Drilling Tool ◽  
Overall Design ◽  
Logging While Drilling ◽  
Physical Construction ◽  
Exciting Wave

To obtain qualified logging while drilling (LWD) data, a new acoustic LWD tool was designed. Its overall design is introduced here, including the physical construction, electronic structure, and operation flowchart. Thereafter, core technologies adopted in this tool are presented, such as dominant exciting wave bands of dipole source, a sine wave pulse excitation circuit, broadband impedance matching, and an intellectualized active reception transducer. Lastly, we tested this tool in the azimuthal anisotropy module well, calibration well, and normal well, working in the model of the cable, sliding eye, and logging while drilling. Experiments showed that the core technologies achieved ideal results and that the LWD tool obtained qualified data.

Development of a directional resistivity logging-while-drilling tool using a joint-coil antenna and its geosteering applications

Geophysics ◽  
2018 ◽  
Vol 83 (5) ◽  
pp. D165-D171
Author(s):  
Zhong Wang ◽  
Huaping Wang ◽  
Treston Davis ◽  
Jing Li ◽  
Suming Wu ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Gas Production ◽  
Voltage Response ◽  
Drilling Tool ◽  
Detection Depth ◽  
Logging While Drilling ◽  
Resistivity Logging ◽  
Coil Antenna ◽  
Production Zone ◽  
Distance To The Boundary

Geosteering is a key technique to increase oil- and gas-production rates, especially within a thin reservoir layer. The purpose of geosteering in the production zone is to keep the drilling path in oil- and gas-bearing reservoirs. To keep the drilling system inside the production zone, downhole sensors must be able to detect bed boundaries, which include identifying the boundary location with respect to the sensor and the boundary distance from the sensor. We have developed a directional resistivity logging-while-drilling (LWD) tool for geosteering applications. The directional LWD tool is equipped with a joint-coil antenna composed of an axially polarized coil Rz connected in series with two transversely polarized coils Rx. During a revolution around the axis of the tool, the voltage of the axial coil VRz, voltage of the transverse coils VRx, and tool face angle [Formula: see text], which indicates the boundary direction, can be extracted through curve fitting the total voltage response of the joint-coil antenna. The distance to the boundary can be derived from a 1D inversion. The LWD tool has been tested in several reservoirs in China, and it has a demonstrated capability to provide reliable and accurate estimations of the boundary direction and distance. Field data indicate that the boundary detection depth can reach 2.1 and 1.7 m when the tool is in a sand and shale formation. Using wireline-logging data from surrounding wells as reference, deviations between the reference and the measured distance to the boundary are within 0.2 m.

scholarly journals Application of Logging While Drilling Tool in Formation Boundary Detection and Geo-steering

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2754 ◽  
Author(s):  
Gaoyang Zhu ◽  
Muzhi Gao ◽  
Fanmin Kong ◽  
Kang Li
Keyword(s):  
Real Time ◽  
Forward Modeling ◽  
Forward Algorithm ◽  
Drilling Tool ◽  
Line Search Method ◽  
Layered Formation ◽  
Series Of Experiments ◽  
Logging While Drilling ◽  
The Stability ◽  
The Cost

Logging while drilling (LWD) plays a crucial role in geo-steering, which can determine the formation boundary and resistivity in real time. In this study, an efficient inversion, which can accurately invert formation information in real time on the basis of fast-forward modeling, is presented. In forward modeling, the Gauss–Legendre quadrature combined with the continued fraction method is used to calculate the response of the LWD instrument in a layered formation. In inversion modeling, the Levenberg–Marquardt (LM) algorithm, combined with the line search method of the Armijo criterion, are used to minimize the cost function, and a constraint algorithm is added to ensure the stability of the inversion. A positive and negative sign is added to the distance parameter to determine whether the LWD instrument is located above or below the formation boundary. We have carried out a series of experiments to verify the accuracy of the inversion. The experimental results suggest that the forward algorithm can make the infinite integral of the Bessel function rapidly converge, and accurately obtain the response of the LWD instrument in a layered formation. The inversion can accurately determine the formation resistivity and boundary in real time. This is significant for geological exploration.

Aero-Acoustic Source Characterization for Flow-Driven Resonators Using Helmholtz Vector Field Decomposition

2011 ◽  
Author(s):  
Helmut Kuehnelt ◽  
Theodore E. Simos ◽  
George Psihoyios ◽  
Ch. Tsitouras ◽  
Zacharias Anastassi
Keyword(s):  
Vector Field ◽  
Source Characterization ◽  
Acoustic Source

Open-source software for the application of microphone array methods

2017 ◽  
Vol 48 (3-4) ◽  
pp. 44-51 ◽  
Author(s):  
Gert Herold ◽  
Ennes Sarradj
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Time Domain ◽  
Microphone Array ◽  
Synthetic Data ◽  
Object Oriented ◽  
Source Characterization ◽  
Acoustic Source ◽  
Array Data ◽  
Flexible Programming

The open-source Python library Acoular is aimed at the processing of microphone array data. It features a number of algorithms for acoustic source characterization in time domain and frequency domain. The modular, object-oriented architecture allows for flexible programming and a multitude of applications. This includes the processing of measured array data, the mapping of sources, the filtering of subcomponent noise, and the generation of synthetic data for test purposes. Several examples illustrating its versatility are given, as well as one example for implementing a new algorithm into the package.

Field Testing of a New Nuclear Magnetic Resonance Logging-While-Drilling Tool

2002 ◽  
Author(s):  
Jan Morley ◽  
Ralf Heidler ◽  
Jack Horkowitz ◽  
Bruno Luong ◽  
Charles Woodburn ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Testing ◽  
Drilling Tool ◽  
Logging While Drilling ◽  
Nuclear Magnetic

Environmental corrections of a dual-induction logging while drilling tool in vertical wells

2018 ◽  
Vol 151 ◽  
pp. 309-317 ◽  
Author(s):  
Zhengming Kang ◽  
Shizhen Ke ◽  
Ming Jiang ◽  
Chengfang Yin ◽  
Anzong Li ◽  
...  
Keyword(s):  
Vertical Wells ◽  
Drilling Tool ◽  
Induction Logging ◽  
Logging While Drilling ◽  
Environmental Corrections
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