Schlumberger

Case Study: Chevron Successfully Places Drain Sections of Two Wells in Nigeria’s Meren Field

PeriScope HD service refines geological model in real time for optimal placement

Challenge: Place horizontal drains in two multilobed reservoirs with possible water encroachment.

Solution:

  • Use PeriScope HD multilayer bed boundary detection service to detect the position and dip of multiple reservoir lobes and oil/water contact (OWC).
  • Drill to section TD with PowerDrive X5 RSS.

Result:

  • Placed two horizontal drains.
  • Detected multiple reservoir lobes in real time.
  • Detected no water contact, validating the reservoir model.
  • Validated geological models in real time and reservoir models post run.

Drain two reservoirs with water presence 

Chevron Nigeria Ltd. needed to confirm the position and dip of multiple reservoir lobes in the landing and horizontal phases of two drain holes planned for the Meren field. Chevron suspected water had encroached into the reservoir and needed the capability to detect the presence of water. 

Deploy integrated BHA to detect OWC and formation layers 

To meet Chevron’s advanced well placement needs, Schlumberger suggested using PeriScope HD multilayer bed boundary detection service paired with adnVISION azimuthal density neutron service and PowerDrive X5 RSS. The technologies would accurately detect multiple formation layers and fluid boundaries, detect water encroachment in the water-injected reservoir, and drill to section TD. 

Placed drainage in best areas, verified postrun 

Chevron successfully placed both drain holes and validated its geological model while drilling with the PeriScope HD service and PowerDrive X5 RSS. In the first well, the PeriScope HD service was able to detect four layers: shale, upper lobe, silt, and lower lobe. The service also estimated the thickness of the upper and lower lobes. With this information, Chevron was able to place the drain in the ideal location within the best lobe. 

In the second well, the PeriScope HD service detected a low-resistivity reservoir top from about 7-ft TVD while in the overburden shale, enabling Chevron to land the wells optimally. In the horizontal section of this well, the service clearly mapped the upper and lower lobes as well as the low-quality zone at the bottom. 

Postrun, Chevron was able to validate its reservoir models using data from the PeriScope HD service.


Download: Chevron Successfully Places Drain Sections of Two Wells in Nigeria’s Meren Field (0.80 MB PDF)

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Deploy Integrated BHA to Detect OWC and Formation Layers

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