Accurate Wellbore Placement Using a Novel Extra Deep Resistivity Service

Helgesen, Tron Bjelland; Fulda, Christian; Meyer, W. Hal; Thorsen, Arve K.; Baule, Ansgar; Rønning, Knut; Iversen, Marianne

doi:10.2118/94378-ms

Cited by 14 publications

(3 citation statements)

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“…Parameter uncertainty is computed for the model reconstructed by inversion and the specific tool configuration. It depends on the noise model assumed, quality of data fit, and sensitivity of tool measurements to the parameter(s) of interest (Nardi et al 2010;Rabinovich et al 2012). The software also enables predrilling analysis of the tool's capabilities in realistic scenarios and also allows real-time inversion results to be evaluated and quality controlled to ensure that, for example, the depth of detection is not overestimated for a specific resistivity environment.…”

Section: Inversion Softwarementioning

confidence: 99%

“…sections by use of extradeep-resistivity tools. The tools have been used for a number of years, primarily on Grane Field in Norway (Helgesen et al 2005), to maintain well position approximately 9 m from an oil/water contact. The extradeep-resistivity measurements are made at frequencies of 20 and 50 kHz by use of a simple three-antenna arrangement in two subs, one containing the transmitter and the other containing two receivers.…”

Section: Introductionmentioning

confidence: 99%

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Extradeep-Resistivity Application in Brazil Geosteering Operations Enables Successful Well Landing

Tilsley-Baker

Antonov

Martakov

et al. 2016

SPE Reservoir Evaluation &Amp; Engineering

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The relatively recent development of azimuthal-resistivity measurements enables proactive geosteering within complex reservoirs. The tools enable determining the distance (up to 5 m in ideal conditions) and the azimuthal direction to a resistivity boundary. In ideal conditions, the well is inside a high-resistivity layer and the shoulder bed is low resistivity, giving geologists warning of approaching adjacent conductive beds. When the tool is in a low-resistivity layer, the depth of detection of an adjacent high-resistivity layer is much smaller. In these situations, it is often not possible to use the tool for effective geosteering.An extradeep-resistivity tool has been used for several years in Norway and has been introduced in the Peregrino Field in Brazil. It operates at lower frequencies than the shallower reading tools, has large transmitter/receiver spacings, and a depth of detection up to 25 m. This tool was deployed in addition to the conventional directional-resistivity instrument.The new application in Brazil was supported by inversion software (still in development) to enable possible interpretation of the geology within the tool range. The inversion results provide information that can help identify adjacent reservoir layers while in the target zone and measure the thickness of the reservoir layer being drilled.Examples are presented from one well where the extradeep resistivity provided early warnings and additional information that helped to steer the well successfully and maximize reservoir coverage. The extradeep measurements from the tool also provide valuable reservoir understanding and knowledge for future well-planning purposes.Extradeep-Resistivity Measurements. To illustrate how the extradeep-resistivity measurements complicate visual interpretation, consider a simple model in Fig. 1.

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Section: Inversion Softwarementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extradeep-Resistivity Application in Brazil Geosteering Operations Enables Successful Well Landing

Tilsley-Baker

Antonov

Martakov

et al. 2016

SPE Reservoir Evaluation &Amp; Engineering

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“…Shale formations are not flat, but have localized dip changes (Helgesen et al, 2005;Muritala et al, 2000). Real-time borehole images (density, resistivity, gamma ray, photoelectric factor) provide an eloquent solution to steering direction uncertainty.…”

Section: Well Placement With Enough Measurements To Determine Local Smentioning

confidence: 99%

Unlocking the Shale Mystery: How Lateral Measurements and Well Placement Impact Completions and Resultant Production

Baihly

Malpani

Edwards³

et al. 2010

All Days

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Across many shale plays in North America, operators ask why production performance disparities exist among horizontal wells. For example, even though drilling and completion practices of a neighboring operator may be mimicked, significantly different production results are frequently observed. Several hypotheses have been presented on the subject with little consensus. In most of these wells, formation evaluation in the lateral section is limited to gamma ray. Using a single curve to model the structure leads to multiple solutions with no way to determine which one is correct. Accordingly, large uncertainties may exist in: 1) determining the relative geologic position of the wellbore, 2) placing perforation clusters, and 3) selecting the appropriate staging design and stimulation treatment for the resulting well placement.To produce wells that perform to their maximum potential, it is fundamentally necessary to understand both the placement of the lateral in the reservoir and the placement of the perforations in the lateral. To optimize these placements, some measurements must be taken in the lateral. Obviously, the value of understanding where to locate the lateral and the perforations must be greater than both the direct costs associated with taking these measurements and the risk weighted costs associated with deploying tools in the lateral. A way to acquire this information while mitigating many of the aforementioned concerns is logging while drilling (LWD). Some of the measurements that LWD can capture along shale laterals include borehole/azimuthal images, stress, and mineralogy. With these comprehensive LWD measurements, not only can the captured data be taken for future completion design and analysis, they can also be used while drilling the lateral to steer the wellbore towards a desired target more accurately than gamma ray only. This paper focuses on how lateral LWD measurements impact well placement, perforation selection, hydraulic fracture stage spacing, completion design, resultant production, and subsequent economics of horizontal shale wells. Practical LWD examples from the Eagle Ford and Woodford Shale plays are presented, along with their impact on the aforementioned subjects.In this paper principles of using LWD measurements and interpretation in a field development plan are described, including relating LWD data to additional functions such as completion design, microseismic hydraulic fracture monitoring, production monitoring, and production logging. Ideas on how to optimize the amount and type of LWD measurements are proposed. Lastly, the paper will examine the impact of LWD measurements on the overall economics of horizontal shale wells.

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High Angle and Horizontal Wells

Ellis

Singer²

2007

Well Logging for Earth Scientists

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Accurate Wellbore Placement Using a Novel Extra Deep Resistivity Service

Cited by 14 publications

References 0 publications

Extradeep-Resistivity Application in Brazil Geosteering Operations Enables Successful Well Landing

Extradeep-Resistivity Application in Brazil Geosteering Operations Enables Successful Well Landing

Unlocking the Shale Mystery: How Lateral Measurements and Well Placement Impact Completions and Resultant Production

High Angle and Horizontal Wells

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