Field Test of a HTHP Laterolog-Type Array Resistivity and Imaging While Drilling Tool
- Qiming Li (Oliden Technology, LLC) | Ting Lau (Oliden Technology, LLC) | Kirk Gee (Oliden Technology, LLC) | Jane Kong (Oliden Technology, LLC) | Jason Gong (Oliden Technology, LLC) | Jeff Aron (Oliden Technology, LLC) | James Mather (Oliden Technology, LLC) | Anzong Li (CNPC) | Sijia Chen (CNPC)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- SPWLA 60th Annual Logging Symposium, 15-19 June, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors
- 3 in the last 30 days
- 121 since 2007
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Laterolog-type resistivity measurement offers significant advantages over the traditional 2Mhz propagation resistivity in water-based mud. When implemented in a drilling collar, these types of sensors can provide not only omni-directional resistivity measurements of much wider ranges and better vertical resolution but also high-resolution fullbore electrical images, making the tool valuable for formation evaluation and for geology and formation structures characterization while drilling. The availability of detail rich wellbore images obtained shortly after drilling while the formation is undamaged, has significantly improved the understanding of wellbore shapes, formation types and geology, fractures and vugs. The while drilling electrical wellbore images also reveal the formation structure relative to the wellbore being drilled and therefore have been increasingly utilized to make realtime geosteering decisions in thin reservoirs and to develop horizontal well drilling, completion and production strategies.
To meet the ever increasing demands of the market, a new laterolog-type array resistivity and imaging while drilling tool has been developed with the following integrated capabilities: 1) focused array laterolog-type resistivity with extended measurement range up to tens of thousands of Ohm-m; 2) increased depth of investigation to reduce the influence of invasion; 3) bed boundary detection capability up to 1 meter from wellbore; 4) high resolution wellbore images while rotating; and 5) quadrant azimuthal resistivity measurement while sliding. The tool utilizes large quadrant electrodes to extend the range of resistivity measurement for accurate formation evaluations, and two additional small (0.4-0.5 in.) button electrodes mounted on a stabilizer to produce high resolution electrical wellbore images. The four large quadrant electrodes, oriented 90-deg apart from each other, can also generate quadrant resistivity curves at any given tool orientation, making it possible to potentially geosteer the well based on resistivity measured from up and down quadrants even while sliding. A large number of azimuthal resistivity measurements of different depth of investigation, are generated through the combination of multiple axial spacing transmitters and azimuthal electrodes. When interpreted, these measurements not only indicate qualitatively the approach of nearby bed boundaries in horizontal wells but also offers the possibility of obtaining quantitative distance to bed boundary detection and structure mapping through inversion analogous to the methodology currently offered by directional propagation resistivity tools, albeit with limited range.
This paper will describe the principle of measurement, introduce the new tool sensor design and configuration, and show tool response characterization with both sophisticated modeling and laboratory measurements. Several field test examples will also be presented with the aim to demonstrate the quality of the measurements and highlight the capability of the tool in applications including wellbore imaging, high resistivity zone delineation, proactive well placement and accurate bed boundary detection in thin bed reservoirs. Comparison with the new generation of directional propagational resistivity tools in imaging and bed boundary detection capability will also be made to delineate the pros and cons of the two types of azimuthal resistivity tools. The field examples clearly show that in water-based mud, this new generation of laterolog-type logging-whiledrilling resistivity and imaging tool, uniquely adds significant value to drilling and formation evaluation applications.
|File Size||3 MB||Number of Pages||21|