1887

Abstract

Summary

Yurubcheno-Tokhomskoe oilfield in east Siberia comprised of very low porosity fractured dolostone reservoir, which is being developed by horizontal wells. Formation evaluation program includes ultrasonic-image and acoustic logs to characterize fracture network and identify permeable fractures. Up to several thousand individual fractures might be identified over horizontal well section, however production logs demonstrate that producing intervals are discrete, short and not evenly spaced. Stoneley wave permeability indicators are not consistently successful in identifying producing intervals due to plugging off permeable fractures by LCM material. To overcome this limitation, we modified acquisition program to include borehole acoustic reflection survey (BARS) that allows to identify big fractures extending far from a wellbore. A novel processing technique has been devised to image fractures oblique and perpendicular to the borehole axis. Production logs confirmed flowing fractures identified on BARS and demonstrated a complex pattern of oil, water and gas influx from specific fracture types. BARS and PLT data allow localization of fractured interval requiring acid stimulation to clean off plugging material. Theory of the method and a case study of BARS data interpretation in horizontal well are discussed.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201901843
2019-05-27
2020-04-05
Loading full text...

Full text loading...

References

  1. HornbyB. E.
    , “Imaging of near borehole structure using full waveform sonic data,” Geophysics, vol. 54, no. 6, pp. 747–757, Jun. 1989.
    [Google Scholar]
  2. TangX.M.
    ,“Imagingnear-borehole structure using directional acoustic-wavemeasurement,” Geophysics, vol. 69, no. 6, p. 1378, 2004.
    [Google Scholar]
  3. WeiZ. and TangX.
    , “Numerical simulation of radiation, reflection and reception of elastic waves from aborehole dipole source,” SEG, vol. 77, no. 6, pp. 1–5, 2012.
    [Google Scholar]
  4. TangX. M., CaoJ., and WeiZ. T.
    , “Shear-wave radiation, reception, and reciprocity of a borehole dipole source: With application to modeling of shear-wave reflection survey,” Geophysics, vol. 79, no. 2, pp.T43–T50, 2014.
    [Google Scholar]
  5. HirabayashiN., TulletJ., and LiyanangeM.
    , “SEISMIC SENSING SYSTEMS AND PROCESSES FOR USINGSAME,” 2018/0284309 A1, 2018.
    [Google Scholar]
  6. HirabayashiN.
    ,“Reflectorimagingusingtrialreflectorandcrosscorrelation?:Applicationtofractureimaging for sonic data,” Geophysics, vol. 81, no. 6, 2016.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201901843
Loading
/content/papers/10.3997/2214-4609.201901843
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error