Case Study: Geosteer Wellbore to Maximize Production

Real-time resistivity data enables Petrolera Ameriven to keep extended-reach horizontal wells within reservoir sands

Challenge: Obtain accurate resistivity measurements in real time for geosteering horizontal wells in Orinoco heavy oil belt of eastern Venezuela.

Solution: Use geoVISION imaging-while-drilling service to acquire high-resolution, lateral resistivity MWD in laminated environment with high resistivity contrast.

Result: Enabled Petrolera Ameriven to maximize wellbore placement within reservoir sands. Provided accurate true resistivity.

Geosteer extended reach wells

Petrolera Ameriven, an operating agent owned by ConocoPhillips, Petroleos de Venezuela, S.A., and Chevron, was drilling extended-reach horizontal wells in the Orinoco heavy oil belt of eastern Venezuela. Geosteering the wellbores to keep them within the reservoir sands required accurate, real-time resistivity measurements. Conventional propagation resistivity measurements in the high-resistivity-contrast, laminated environment were often unusable, due to bed-boundary and shoulder-bed effects, mud filtrate invasion, and resistivity anisotropy.

Measure resistivity in real time

Petrolera Ameriven acquired the real-time resistivity measurements it needed for geosteering and formation evaluation by equipping the BHA with a sub for the geoVISION imaging-while-drilling service. This sub has an integral, cylindrical electrode that delivers a high-resolution, lateral resistivity referred to as ring resistivity. In addition, three azimuthally focused 1-in button electrodes, spaced longitudinally along the axis of the sub, provide multiple depths of investigation that permit quantification of invasion profiles. The geoVISION service sub also makes a bit resistivity measurement that allows real-time coring and casing point selection in both conductive and resistive mud environments.

Maximize wellbore placement in reservoir sands

These geoVISION measurements provided the real-time geosteering guidance needed to maximize the length of wellbore within the reservoir sands. The measurements behaved predictably and were easily corrected to yield an accurate true resistivity value in the high-resistivity-contrast, laminated environment that made conventional propagation resistivity measurements unreliable.

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