... (bandwidth) used when calculating Hm0. It is obvious that the selection of f 1 and f 2 has a considerable influence on the Hm0 values. Furthermore, it is important that the noise contribution in the wave power spectrum is negligible to obtain accurate measurements. For the radar sensor considered...

... by the borehole conditions in terms of borehole diameter, irregularity of its walls (rugosity and/roughness), cavitation issues, fractures and ambient noises (especially at shallow depth), as well as borehole stability. The analysis of the results confirmed that both in-situ testing methods have promising...

... dem difference map offshore technology conference subsidence bowl seafloor change haneberg seafloor height simulation fluid dynamics noise mbe survey standard deviation artificial intelligence auv mbe survey difference map upstream oil & gas bathymetry equation reservoir...

... with limited dependency on sea state. At the same time, wind turbine manufacturers are developing larger offshore wind turbines and legislators are instituting more limitations, for example on the emissions of underwater noise. These developments create additional challenges for upscaling the installation...

... should be judged based on the acceptable range of variations for inferred parameters as well as related confidence levels. These would lead to an acceptable noise level in the recorded data. Having access to the aforementioned quality control criteria can be very useful for example when the tool...

... on human life and the environment can be significant. The pipeline operator's public image can be damaged with non- negligible economic or political consequences. PipeLIDS has been developed to minimize the consequences of leaks from onshore pipelines. It uses acoustic technology for detection of noise...

... the seafloor. This introduces substantial noise into the data and can only be done safely on smooth, sandy/muddy substrates. The escarpment's surface was highly irregular with boulders and ledges. Thus, a cable design was employed where the active hydrophone was suspended just above the seafloor. This reduced...

...-165062 Chen , K. , Zhu , D. , Hill , A. D. 2015 . Acoustic Signature of Flow From a Fractured Wellbore . Presented at the SPE ATCE in Houston , 28–30 September 2015 . SPE-17477 . Hill , A. D. 1990 . Noise Logging . In Production Logging: theoretical and interpretive...

... Define target fatigue life Set threshold measurement target Select measurement system e.g. strain, displacement, angle Define response corresponding to threshold fatigue life Assess implications of instrument noise on threshold measurements Define data processing requirements Explanations...

... Abstract Noise attenuation is one of the most important steps in seismic data processing and it directly affects the final imaging quality of seismic data. Traditional de-noising methods can easily eliminate simple noise, such as spike noise or linear noise, but they can't efficiently handle...

... field ty sand water sweep impedance change noise lithology prediction inversion constraint OTC 23700 New Opportunities from 4D Seismic and Lithology Prediction at Ringhorne Field, Norwegian North Sea David H. Johnston, ExxonMobil Production Co. Upendra Tiwari, ExxonMobil Exploration Co...

... between the sound generated by multiphase flow noise and increased sand production is distinguishable with regard to frequency content. To assess the prototype system, several candidate wells with sand production issues were selected from the Deepwater Gunashli (DWG) field in Azerbaijan. These wells had...

... installation microseismic event otc 19693 magnitude seismic technology noise floor noise deployment reservoir characterization upstream oil & gas amplitude real time system offshore technology conference configuration reservoir management sensor microseismic monitoring engineer OTC...

... real time system perforation open screen scenario upstream oil & gas log analysis noise gravel sand impairment well logging sensor experiment real-time completion reservoir surveillance production logging gravel pack bakulin production monitoring completion OTC 19213 Real-Time...

... thickness below 1/8th of a wavelength one cannot separate differences in reflection coefficient magnitude from changes in layer thickness (even in the absence of noise), and thus 1/8th of a wavelength is generally considered the limit of seismic resolution. However, for even impulse pairs, response...

... to improve depth of penetration. The test also addressed methods to maximize the capture of weak, low-frequency reflection signals. Data examples show that this new OBC technology provides significantly better deep (> 10,000m) data than conventional streamer. At very low frequencies the ambient noise...

... experiences, review the work undertaken by the JIP and provide initial guidelines to address the issue. Introduction In the last 5 years, a number of offshore installations that utilise flexible risers for single phase gas service have experienced high levels of piping noise and vibration. This has...

... Abstract For seismic reservoir monitoring, interference noise from other seismic operations can cause either delays in data acquisition due to timesharing, or additional efforts to attenuate the seismic interference (SI) during processing. Here we present a method which takes advantage...

... largest semi-sub, Statoil's Åsgard B platform, a serious noise and vibration phenomenon was identified in the gas export system. This system consists of a manifold on the platform topsides connected to parallel flexible risers linked to a subsea Export Riser Base which feeds the gas into the 42" export...

... at the time. At frequencies of 1Hz and below there is a nearly continuous background noise coming primarily from the South and East that rumbles along for the entire 2.5 hours, with a phase velocity across the array of about 2000 m/s. This is most likely ocean wave-generated noise. At frequencies below 2Hz...