3D Log Interpretation in Horizontal Wells Using Example of Neocomian Age Formation of Western Siberia

Tuesday, 16 January 2018 Read 1657 times
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To increase the efficiency of field development, more and more wells are drilled with horizontal or high angle section at the end (HAHZ). Despite this, well logging data analysis is based on methodic and models developed using data from vertical and slant wells with relatively low inclination angle. Although it works well for vertical wells, it does not take into account geometric effects associated with high angle of drilling where wells are drilled almost parallel to formation layers. That often leads ambiguities while logging data analysis and formation evaluation in HAHZ wells compared to low angle wells. This fact does not allow using logging data from horizontal wells for geological and hydrodynamic models, which reduces its credibility.

The presentation describes uncertainties that exist when using conventional processing and interpretation techniques in horizontal wells and their causes. For demonstration purpose, the paper uses an example from real well, which has been drilled horizontally in complex environment in one of the field of Western Siberia region of Russia.

Azimuthal measurements application together with advanced modeling software packages enable more reliable estimation of well length exposed to reservoir, spatial position of its boundaries and essential reservoir properties, such as porosity and saturation. As a result, the geological model may be refined locally.

Author:

Bokarev Anton, Schlumberger

Anton was graduated as Oil ang Gas geologist in the Tyumen Industrial University in 2008. At Schlumberger, he has taken the path from the Field Engineer to the international Logging-While-Drilling instructor. He took part in projects in Western and Eastern Siberia, the Timano-Pechora and Caspian regions. Has experience working for foreign projects in the UAE and Oman. Currently he holds the position of Senior Petrophysicist at Schlumberger in Tyumen. The field of expertise of the author is the Logging While Drilling technologies and its practical application. He is the author of 10 scientific articles and patents. Has experience working and teaching abroad.

Congress Center of RF CCI. Start at 7 p.m.:

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