Application of Logging While Drilling - Nuclear Magnetic Resonance in Reservoir Evaluation and Geosteering: A Case Study in Marrat Reservoir, Umm Roos Field, West Kuwait

Nguyen, Kim Long; Fahmy, Mahmoud Fawzy; Dzhaykiev, Bekdaulet; Odiase, Paul; Al-Morakhi, Rasha; Al-Ajmi, Mohammed Mubarak; Verma, Naveen; Quttainah, Riyad

doi:10.2118/211699-ms

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…To address this, geosteering emerged as a critical technology, which involves precise control and adjustment of drilling operations to navigate through subsurface geological formations with accuracy and efficiency [1][2][3][4][5]. This transformative technology has revolutionized well drilling and reservoir management [6], resulting in reduced operational costs, optimized hydrocarbon production, and a minimized environmental footprint.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Automated Geosteering Interpretation Combining Log Interpretation and 3D Horizon Tracking

D’Angelo,

Zhao,

Zhang

et al. 2024

Geosciences

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Existing methods for estimating formation boundaries from well-log data only analyze the formation along the wellbore, failing to capture changes in the 3D formation structure around it. This paper presents a method for real-time 3D formation boundary interpretation using readily available well logs and seismic image data. In the proposed workflow, the mean formation boundary is estimated as a curve following the well path. 3D surfaces are then fitted through this boundary curve, aligning with the slopes and features in the seismic image data. The proposed method is tested on both synthetic and field datasets and illustrates the capabilities of accurate boundary estimation near the well path and precise representation of boundary shape changes further away from the well trajectory. With this fully automated geological interpretation workflow, human bias and interpretation uncertainty can be minimized. Subsurface conditions can be continually updated while drilling to optimize drilling decisions and further automate the geosteering process.

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Section: Introductionmentioning

confidence: 99%

Real-Time Automated Geosteering Interpretation Combining Log Interpretation and 3D Horizon Tracking

D’Angelo,

Zhao,

Zhang

et al. 2024

Geosciences

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Application of X-Ray Diffraction Analysis & X-Ray Fluorescence in Assisting Wellbore Placement and Geo-Steering of 4 ½" Slim Hole

Nguyen,

Al-Morakhi,

Al-Mutairi

et al. 2024

Adipec

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Horizontal drilling has demonstrated its superiority in developing the Middle Marat reservoir within the Umm Gudair (UG) field in Kuwait. However, achieving precise placement of the lateral section in thin carbonate layers requires meticulous geo-steering. Due to environmental concerns and the high operational costs associated with using radioactive-based porosity logging tools in such wellbore profiles, the preferred method for geo-steering is to utilize Logging-While-Drilling (LWD) gamma ray and resistivity logs (Nguyen et al, 2022). When drilling with a 4 ½″ slim hole, LWD data can suffer from poor quality due to a low signal-to-noise ratio or complete loss of signal caused by mud telemetry issues. To address this challenge, advanced cutting analysis techniques, including X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF), have been integrated with LWD to enhance the accuracy of lateral sidetracking in the UG field. Advanced analysis performed on cuttings recovered on the surface while drilling confirms that the wellbore remains within the targeted sub-layer, while LWD data monitors larger-scale boundaries. This approach is illustrated in a limestone formation sub-layer with a thickness of approximately 20 feet, characterized by low natural radiation and minimal resistivity contrast with adjacent sub-layers. A thorough pre-job study was conducted using advanced analysis on cuttings from offset wells, with data resolution at 10 feet. The analysis encompassed elemental composition, chemostratigraphy, and mineralogy. Chemostratigraphic zones were identified based on distinct changes in chemical and mineralogical profiles, marked by specific elements and key ratios. These zones are expected to be consistent over significant distances, at least within the length of the horizontal wellbore, and should be easily identifiable in the cuttings. Near real-time formation evaluation was achieved with a controlled rate of penetration (ROP) of 10 ft/hr, allowing XRF data to be obtained just 5 feet behind the bit while sliding and 10 feet behind the bit while in rotary mode. With the LWD signal trailing at 45 feet, elemental data from the XRF was instrumental in pinpointing the top of the targeted sub-layer and successfully landing the well. The ability to clearly and precisely identify formation tops in the sub-layers provided a solid basis for geo-steering the lateral section. Advanced cuttings analysis played a crucial role in geo-steering the well, especially in areas where the LWD gamma ray (GR) signature was ambiguous and in a 485-foot section with no LWD signal. This approach also helped avoid lost time and costs from unwanted trips due to third-party tool failures, estimated at 36 hours. The well was tested with excellent oil flow, demonstrating that advanced cutting analysis (XRF and XRD) effectively supported real-time geo-steering in slim-hole scenarios where LWD capabilities are limited and uncertain.

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Application of Gas While Drilling in Fluid Detection and Perforation Strategy in Jurassic Reservoirs

Nguyen,

Shehabeldin,

Al-Sabea

et al. 2024

All Days

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Nowadays, the acquisition of Gas While Drilling (GWD) is applied widely in the Oil and Gas industry. The analysis of gas data plays a remarkable role in evaluating the hydrocarbon potential of the formations, especially in high-pressure, tight, and fractured carbonate reservoirs. In addition, the GWD finds its application in geo-steering to drive high-angle or horizontal wells to achieve maximized reservoir contact (MRC). This paper presents a procedure of interpreting gas data while drilling and its application in formation evaluation, determination of productive intervals, fluid characterization, and identification of fluid contacts. The study discusses the Upper and Middle Jurassic reservoirs in New Fields, West Kuwait. The excellent result of the GWD analysis efficiently identifies the hydrocarbon potentials and fluid contacts in New Fields. The well test results of recently drilled wells absolutely prove the successful deployment of the GWD method in West Kuwait.

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Application of Logging While Drilling - Nuclear Magnetic Resonance in Reservoir Evaluation and Geosteering: A Case Study in Marrat Reservoir, Umm Roos Field, West Kuwait

Cited by 3 publications

References 4 publications

Real-Time Automated Geosteering Interpretation Combining Log Interpretation and 3D Horizon Tracking

Real-Time Automated Geosteering Interpretation Combining Log Interpretation and 3D Horizon Tracking

Application of X-Ray Diffraction Analysis & X-Ray Fluorescence in Assisting Wellbore Placement and Geo-Steering of 4 ½" Slim Hole

Application of Gas While Drilling in Fluid Detection and Perforation Strategy in Jurassic Reservoirs

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