Development of a downhole sparker source with adjustable frequencies

Heigl, Werner M.; Radtke, Robert P.; Stokes, Robert H.; Glowka, D.A.

doi:10.1190/segam2012-0763.1

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…Using transient sources (e.g., sparker, Heighl et al . ) requires the precise knowledge of the trigger start time. Swept sources (Kolle and Theimer ) require recording reference pilot signals with methods similar to drill‐bit SWD.…”

Section: Discussionmentioning

confidence: 99%

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Drill‐bit seismic monitoring while drilling by downhole wired‐pipe telemetry

Poletto

Miranda

Corubolo

et al. 2014

Geophysical Prospecting

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Drill‐bit seismic while drilling provides reverse vertical seismic profiles with large configurations of surface seismic sensors. This seismic while drilling technique makes it possible to predict the formation changes ahead of the bit and to image 2D and 3D structures without interfering with the drilling activity. The method is based on the recording of reference (pilot) signals which enable us to recognize and process the signal of the downhole drill‐bit source, thus obtaining impulsive seismograms after the crosscorrelation and deconvolution of the pilot signals and the seismic data recorded by surface or crosswell geophones. One issue in the application of this methodology can be the loss of the transmitted energy for the reference signal propagated from the bit to the surface through the drill string, when the pilot signals are recorded at the surface, at the top of the drill string. It is well known that with polycrystalline diamond compact bits, the pilot signal recorded at the surface may be weak and consequently the seismic while drilling results are poor. This may also happen during drilling in the sliding mode without pipe rotation, and in highly deviated or horizontal wells. A solution to improve the drill‐bit seismic while drilling method in these conditions is to record the reference signal in the proximity of the bit source, using downhole near‐bit tools to get good‐quality measurements of the pilot signal. We present drill‐bit seismic while drilling results obtained in a drilling test using wired pipes for high‐rate communication from bottom hole to the surface. The results demonstrate the applicability of this integrated approach as a standard procedure. The advantage of this is to provide real‐time synchronized reverse vertical seismic profiles, as well as high‐resolution and good‐quality data in terms of S/N and high‐frequency content. The method improves the use of the working drill bit as a downhole seismic source with different types of bit and drilling conditions.

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Section: Discussionmentioning

confidence: 99%

“…; Heigl et al . ). In this context, seismic while drilling (SWD) using the working drill bit as a downhole source is a known tool providing reverse vertical seismic profiling (reverse VSP or RVSP) information at relatively low cost along with large configurations of surface seismic sensors (Poletto and Miranda ).…”

Section: Introductionmentioning

confidence: 97%

Drill‐bit seismic monitoring while drilling by downhole wired‐pipe telemetry

Poletto

Miranda

Corubolo

et al. 2014

Geophysical Prospecting

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“…It has been suggested that a sparker could be designed to maximise the energy in the desired frequency range (Brizzolara et al, 2003(Brizzolara et al, , 1999. It appears that control over the peak acoustic frequency generated by a sparker may be able to be achieved by controlling parameters such as capacitance, which affects the pulse length (Brizzolara et al, 1999;Heigl et al, 2012;Paillet, 1984).…”

Section: Acoustic Sparkersmentioning

confidence: 97%

Acoustic methods for biofouling control: A review

Legg¹,

Yücel²,

Carellan³

et al. 2015

Ocean Engineering

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“…Usually water, or salty water, is used as a medium of transforming the shock wave. [12] found that when the electric energy was discharged through the liquid, it produced heat, which almost instantaneously vaporized the surrounding fluid and a vapor bubble of high pressure and temperature were formed. This vapor bubble gave rise to a pressure shock wave within the liquid.…”

Section: Electrohydraulic Forming Process (Ehf)mentioning

confidence: 99%

Experimental investigation of the pulse duration on the efficiency and electrode wear of electrohydraulic forming process

Ledoux

2023

Manufacturing Rev.

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Electrohydraulic Forming (EHF) is a high velocity sheet metal forming technique using high-energy electrical discharges in a water chamber to shape complex parts. Despite its potential benefits, the EHF process is not well understood, and further research is needed to comprehend the underlying physical mechanisms and optimize the process parameters. One of the critical factors is the control of energy discharge within the forming chamber in terms of arc duration. The proposed study aimed to analyze its impact on the characteristics of electrohydraulic forming focusing on the efficiency of the operation and electrode wear. As a result, the height of the formed parts was compared and used to evaluate the efficiency of the operation. The electrode wear was estimated by a phenomenological model. By comprehending the relationships between these factors and operational efficiency, a tradeoff was established to enhance the EHF process, taking into account electrode wear, thereby expanding its industrial applications.

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Development of a downhole sparker source with adjustable frequencies

Cited by 5 publications

References 4 publications

Drill‐bit seismic monitoring while drilling by downhole wired‐pipe telemetry

Drill‐bit seismic monitoring while drilling by downhole wired‐pipe telemetry

Acoustic methods for biofouling control: A review

Experimental investigation of the pulse duration on the efficiency and electrode wear of electrohydraulic forming process

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