Demonstrations of Real-Time Borehole Seismic From an LWD Tool

Underhill, W.; Esmersoy, C.; Hawthorn, A.; Hashem, M.; Hendrickson, J.; Scheibel, J.

doi:10.2523/71365-ms

Cited by 6 publications

(5 citation statements)

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“…To solve the problem and to avoid multiple‐casing ringing, Seismic While Drilling (SWD) or Seismic While Tripping (SWT) techniques (e.g., Rector and Marlon ; Underhill et al . ; Poletto and Miranda ) should be applied to acquire a shallow velocity profile even before multi‐casing is installed.…”

Section: Discussionmentioning

confidence: 99%

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Hewett

2014

Geophysical Prospecting

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Quantifying uncertainties of surface seismic velocity models is a difficult task. The use of multifarious vertical seismic profiling data provides quantification of velocity model uncertainties. Two borehole seismic diagnosis methods for velocity model uncertainties are developed. The first method is performed with 3D ray‐traced first arrival times through a surface seismic velocity model and compared with measured first arrival times from downhole receivers. It generates a profile of absolute and relative misfits, indicating the velocity uncertainty as a function of depth. The second approach directly compares the differences between the first arrival incident angles measured from 3‐C borehole seismic data and the calculated first arrival incident angles of seismic rays through the velocity model to quantify the model uncertainties. Five seismic velocity models in the Gulf of Mexico are diagnosed using the diagnosis methods with up to six sets of borehole seismic data recorded in three wells. The uncertainty profiles vary with depths and azimuths, revealing the complexity of velocity model uncertainties and providing some clues for further velocity updating. The diagnosis methods are used as velocity updating QC tools and integrated with the conventional seismic velocity updating flow to complement the criteria of flat common image gathers.

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Section: Discussionmentioning

confidence: 99%

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Hewett

2014

Geophysical Prospecting

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“…Preferably, drillers like to visualize the well trajectory in the domain, which necessitates updating the conversion of the seismic image into depth several times during drilling, [20,21], or OGS, Trieste, and ENI, Milan, Italy, [22][23][24], devoted to developing the drillbit SWD technique applied continuously while drilling, and without downhole reference measurement, the seismic signal-to-noise ratio of the drillbit signal is often too weak, thus impractical for sustained industrial use in all geographical areas worldwide. In contrast, the examples of VSP-WD given in [25][26][27] illustrate how the recorded 3C geophone data can be promising, and now yield systematic excellent direct arrivals; however, the coupling quality and the vector fidelity of the 3C response of VSP-WD tools still need to be improved in comparison with the wireline VSP tools.…”

Section: Application Domain Of Vsp-swdmentioning

confidence: 99%

Seismic While Drilling (Swd) Techniques with Downhole Measurements, Introduced by Ifp and Its Partners in 1990-2000

Naville

Serbutoviez

Throo

et al. 2004

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Techniques de sismique pendant forage avec mesures de fond, inaugurées par l'IFP et ses partenaires en 1990-2000 -La sismique pendant forage (SWD), comprend toute technique opérée pendant que le train de tige est dans le puits, pendant le forage effectif ou pendant les manoeuvres d'ajout de tige ou de nettoyage. Deux techniques utilisées par l'industrie sont développées ici : -l'écoute sismique du trépan pendant forage (drillbit-SWD), usitée depuis 1986, qui consiste à enregistrer le signal avec un nombre indéfini de capteurs de surface, ainsi qu'un signal de référence représentatif des vibrations du trépan ; -le profil sismique vertical pendant forage (VSP-WD), qui consiste à enregistrer le signal émis par une source de surface avec un capteur sismique et un enregistreur intégrés à la garniture de forage (BHA). Cette technique émergente est opérée depuis l'année 2000 principalement par la société Schlumberger. Les deux techniques efficaces suivantes, assimilables à la sismique pendant le forage, ne seront pas discutées ici : -la technique de VSP dans le tubage (TLC), en particulier le VSP au câble avec outil descendu au câble dans un tubing de production ou un train de tiges de forage ; -le « VSP intermédiaire », qui consiste à acquérir un VSP conventionnel au câble avant la pose et la cimentation d'un cuvelage (casing), afin d'affiner le calage du puits à la sismique de surface et de prédire les zones en surpression au-dessous du trépan. Les développements récents effectués par l'IFP et ses partenaires en sismique pendant forage ont bénéfi-cié de la technologie de transmission temps réel à haut débit par fils et tiges câblés du système TRAFOR, qui a permis d'exécuter rapidement des tests terrains cruciaux. Pendant la période 1986-2003, la pratique d'écoute sismique du trépan visait une utilisation continue sur la profondeur totale du forage, avec peu de capteurs de surface, et sans adjonction d'enregistreur de puits pendant le forage : cette technique a donné des résultats mitigés, quasi nuls avec les trépans de type PDC (Polycrystalline Diamond Cutter). Les meilleurs résultats ont été obtenus avec l'usage de trépan de type tricône, lors du forage de formations plutôt dures, en évitant des valeurs faibles pour les paramètres de poids sur outil (WOB) et vitesse de rotation (RPM). L'IFP a introduit dans la technique d'écoute sismique du trépan les innovations suivantes : -les mesures de fond pendant forage, afin de mieux comprendre le processus d'émission sismique du trépan ; -l'amélioration de l'architecture mécanique de la garniture (BHA) en intégrant un élément amortisseur permettant d'optimiser la qualité du signal source émis et de diminuer les émissions secondaires indésirables ;Interactive Drilling / Forage interactif D o s s i e rOil & Gas Science and Technology -Rev. IFP, Vol. 59 (2004)

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“…This led to the development of the seismic drilling tool which became an alternative to the conventional VSP by providing the same quality of data much faster. Interested readers are referred to references [94][95][96] for details about seismic waveform processing techniques used in VSP while drilling. The seismic-guided drilling concept described in [93] is shown in Figure 14.…”

Section: Vsp While Drillingmentioning

confidence: 99%

Prediction and Early Detection of Karsts—An Overview of Methods and Technologies for Safer Drilling in Carbonates

2021

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The nature of carbonate deposition as well as diagenetic processes can cause the development of unique geological features such as cavities, vugs and fractures. These are called karsts. Encountering karsts while drilling can lead to serious consequences such as severe mud losses, drops of bottom hole assembly and gas kicks. To improve drilling safety in intervals of karstification, it is important to detect karsts as early as possible, preferably in advance. In this paper, we review methods and technologies that can be used for the prediction and early detection of karsts. In particular, we consider acoustic, resistivity, seismic and drilling-data methods. In addition to the inventions and technologies developed and published over the past 40 years, this paper identifies the advantages, limitations and gaps of these existing technologies and discusses the most promising methods for karst detection and prediction.

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Demonstrations of Real-Time Borehole Seismic From an LWD Tool

Cited by 6 publications

References 1 publication

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Borehole seismic quantitative diagnosis of a seismic velocity model for 3D seismic imaging of subsurface structures

Seismic While Drilling (Swd) Techniques with Downhole Measurements, Introduced by Ifp and Its Partners in 1990-2000

Prediction and Early Detection of Karsts—An Overview of Methods and Technologies for Safer Drilling in Carbonates

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