Integrating Pilot and Lateral Openhole Measurements for Lateral Landing Point Assessment and Hydraulic Fracture Design—A Case Study from the Delaware Basin, West Texas
- Edgar Velez (Schlumberger) | Farhan Alimahomed (Schlumberger) | Elia Haddad (Schlumberger) | Irina Mikhaltseva (Schlumberger) | Andrew Dodds (Schlumberger) | Lance Smith (Schlumberger) | Jorge Gonzalez (Schlumberger)
- 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
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- 172 since 2007
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Well landing zone selection and a tailored lateral staging and perforation design can have a large impact on well productivity. A successful field development is intrinsically related to both landing and completion optimization, in particular where several stacked producible horizons can be targeted such as in the Delaware basin in West Texas. Understanding reservoir and completion properties is key in the decision process for optimal well landing selection and completion optimization. Two quality factors are defined for this optimization: (1) reservoir quality (RQ) and (2) completion quality (CQ).
RQ encompasses petrophysical properties such as porosity, permeability, saturation, and total organic carbon (TOC). RQ is of most importance in pilot wells to identify and rank the most prolific horizons in stacked horizons but is sometimes overlooked or dismissed in lateral wells. Typical evaluation techniques to define RQ include using data from basic logs such as triple combo, but the complexity of the unconventional reservoirs has shown that advanced wireline logs such as spectroscopy, magnetic resonance, and images are needed to accurately quantify petrophysical properties. Completion properties such as Poisson’s ratio, Young’s modulus, minimum horizontal stress, and natural fractures can also be grouped to define the CQ of a given rock. CQ is the main input for the hydraulic fracture simulators which aim to achieve the primary objective of determining fracture height growth, overall geometry, and pinch points. Previous revisions have shown the importance of accounting for the anisotropic nature of the unconventional rock and its mechanical properties in which the rock layering intensity and weak interfaces influence the minimum horizontal stress. Hence, data from borehole images coupled with advance acoustic dipole data and mini stress tests are instrumental for the calibration of the hydraulic fracture model.
Placing stages and perforations using log data has had a positive impact on production in vertical and lateral wells. Success is based on the use of dipole sonic derived anisotropic mechanical properties and stress calculations to improve the fracturing results; petrophysical rock properties, which define the quality of the reservoir; and geological information from borehole images such as fractures and lateral facies variation that either impact the reservoir quality or the completion quality.
In this paper, we will present a case history that shows the integration of an in-depth evaluation of various reservoir properties grouped under RQ and CQ factors applied to a pilot and a horizontal well using the latest advance wireline logs for well landing selection and completion optimization in West Texas. Lateral and vertical information from the borehole images were used to build a 3D geomodel in which the main RQ and CQ properties were propagated with the goal of improving the hydraulic fracture model.
|File Size||3 MB||Number of Pages||12|