Coiled Tubing Seismic While Drilling

Jackson, T.S.; Gorrara, Andrew

doi:10.2118/67753-ms

“…However, it has been found that the technique using the bit as a source is generally ineffective in soft sediments, horizontal wells, and while drilling with polycrystalline diamond compact (PDC) bits. 3 The alternative to SWD is intermediate wireline checkshot or vertical seismic profile (VSP) surveys, which are typically run to reduce the uncertainty in putting the drill bit on seismic images and sometimes to provide a velocity model for seismic reprocessing. Being able to make this VSP or check-shot survey while drilling can significantly reduce costs by eliminating wireline rig time.…”

Section: Introductionmentioning

confidence: 99%

“…The seismic source for the field tests consisted of three 150-in 3. air guns mounted on a triangular frame.…”

mentioning

confidence: 99%

Demonstrations of Real-Time Borehole Seismic From an LWD Tool

Underhill¹,

Esmersoy²,

Hawthorn³

et al. 2001

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA new technique provides conventional borehole seismic measurements in real time while a well is being drilled. The system consists of a logging-while-drilling (LWD) tool with seismic sensors positioned near the drill bit, a seismic source at the surface, and a measurement-while-drilling (MWD) system for real-time telemetry. The seismic source is fired during pipe connections, seismic data are processed downhole and check-shot information is sent to the surface.Borehole seismic tools conveyed by wireline cable have been used for a variety of applications including seismic timedepth mapping, and reflection and transmission imaging of subsurface structures. Although wireline borehole seismic services are mature, they are unable to provide all the benefits that are sought in real time while drilling. This is particularly the case when borehole seismic surveys are conducted to help make drilling and well construction decisions, such as steering and deciding on casing and coring points. The new service provides standard borehole seismic information in real time that can be exploited for drilling optimization, cost savings, and safety improvements. Check-shot (time/depth) data are used to place the bit on the seismic map to help well navigation and casing point selection and to avoid drilling hazards, such as pore pressure, seen on the seismic. Real-time seismic velocities can be used to update pore-pressure predictions from surface seismic. Ultimately, the real-time velocities will be combined with look-ahead images, formed from the seismic reflections from horizons ahead of the bit, to provide a direct measurement of the distance to a marker of interest.In 2000, a field-test campaign conducted with experimental tools in the Gulf of Mexico demonstrated the first known real-time check-shot technique with an LWD tool. We will show the results and further describe the status of the service.

show abstract

Demonstrations of Real-Time Borehole Seismic from an LWD Tool

Underhill

¹

,

Esmersoy

²

,

Hawthorn

³

et al. 2001

SPE Annual Technical Conference and Exhibition

View full text Add to dashboard Cite

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA new technique provides conventional borehole seismic measurements in real time while a well is being drilled. The system consists of a logging-while-drilling (LWD) tool with seismic sensors positioned near the drill bit, a seismic source at the surface, and a measurement-while-drilling (MWD) system for real-time telemetry. The seismic source is fired during pipe connections, seismic data are processed downhole and check-shot information is sent to the surface.Borehole seismic tools conveyed by wireline cable have been used for a variety of applications including seismic timedepth mapping, and reflection and transmission imaging of subsurface structures. Although wireline borehole seismic services are mature, they are unable to provide all the benefits that are sought in real time while drilling. This is particularly the case when borehole seismic surveys are conducted to help make drilling and well construction decisions, such as steering and deciding on casing and coring points. The new service provides standard borehole seismic information in real time that can be exploited for drilling optimization, cost savings, and safety improvements. Check-shot (time/depth) data are used to place the bit on the seismic map to help well navigation and casing point selection and to avoid drilling hazards, such as pore pressure, seen on the seismic. Real-time seismic velocities can be used to update pore-pressure predictions from surface seismic. Ultimately, the real-time velocities will be combined with look-ahead images, formed from the seismic reflections from horizons ahead of the bit, to provide a direct measurement of the distance to a marker of interest.In 2000, a field-test campaign conducted with experimental tools in the Gulf of Mexico demonstrated the first known real-time check-shot technique with an LWD tool. We will show the results and further describe the status of the service.

show abstract

Research and Test of Downhole Measurement Device for Seismic Measurement while Drilling System

Gao

¹

,

Jia

²

,

Zhao³

et al. 2018

Day 3 Thu, March 22, 2018

0

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The combination of seismic exploration technology and drilling engineering forms the seismic measurement while drilling (SWD) technology, which can provide conventional borehole seismic measurements in real time while a well is being drilled. Just as conventional while-drilling services, it is effective and efficient in supporting drilling decisions. With measurement device positioned near the drill bit, real-time processing of downhole seismic data can increase the safety and efficiency to the drilling work. We study the problem in a vertical layered media by using while-drilling measurements, the artificial signal emitted by the seismic source is recorded by surface / downhole sensors, then the direct arrival traveltimes could be obtained after basic data processing. Using the traveltimes as the input of a Bayesian inversion procedure for the estimation of the bit position and the velocity model, the engineers would get the estimated values and their associated uncertainty, which could be used to predict the formation geology ahead of the drill bit and to find the lithology, fracture and abnormal pressure in front of the drill bit in time. Conventional system has been available to the petroleum industry for some time, with seismic sources located on the surface and receivers in a borehole. The downhole detection device for SWD is mainly composed of three sets of geophone arrays, which are distributed in different axial direction, as well as the corresponding control and processing circuit. We test the inversion strategy on realistic cases in the laboratory and oilfield. According to functions, the electronic circuit is divided into main control and communication unit, signal acquisition unit, storage unit, and power detection & data play back unit. By cross-correlation processing of the direct seismic wave and the reflected waves from formation boundary, the performance of the systems were well proved. Based on theoretical analysis, system development and experimental study, this paper will highlight the technical development.

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Coiled Tubing Seismic While Drilling

Cited by 3 publications

References 1 publication

Demonstrations of Real-Time Borehole Seismic From an LWD Tool

Demonstrations of Real-Time Borehole Seismic From an LWD Tool

Demonstrations of Real-Time Borehole Seismic from an LWD Tool

Research and Test of Downhole Measurement Device for Seismic Measurement while Drilling System

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