Integration of Methods for Forecasting and Identification of Rock Faults and Fracture Zones to Reduce Risks at their Crossover during Extended Reach Drilling of Long Horizontal Sections (6000 m) in Yuri Korchagin Field

Golenkin, Mikhail; Shtun, A.; Khaliullov, I.; Sadykov, L.; Zakharov, I.

doi:10.2118/171320-ms

All Days 2014

DOI: 10.2118/171320-ms

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Integration of Methods for Forecasting and Identification of Rock Faults and Fracture Zones to Reduce Risks at their Crossover during Extended Reach Drilling of Long Horizontal Sections (6000 m) in Yuri Korchagin Field

Mikhail Golenkin

A. Shtun

I. Khaliullov

et al.

Abstract: This article is based on results of drilling wells in Yuri Korchagin field. Interpretation of the obtained data derived the conclusions that will help to stake future wells in better geological conditions and minimize risks during construction of wells.

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Cited by 4 publications

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Integrated Approach to Drilling ERD Wells with the Innovative Reservoir-Scale Mapping While Drilling Technology on Korchagina Field

et al. 2015

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Integrated approach with geological, geomechanical and petrophysical support is vital for successful extended reach drilling (ERD) in Yuri Korchagin field. Geological structure, represented by anticlinal fold, is characterized by variable formation dipping at the flanks. The field development is performed with the wells drilled from a stationary platform, located at the field crest. The main factor, determining the approach to the field development, is the relatively small thickness of the oil rim of 19.9 m, limited by fluid contacts. Hence, the objectives of planned net to gross ratio (NTG) and production rates can only be achieved by drilling ERD wells with the average measured depth of 4000 to 6500 m.It is hardly possible to precisely forecast structural behavior based purely on well to well correlation and seismic interpretation. Frequent lateral lithology variations and presence of faults represent additional uncertainties. Therefore, successful placement of the horizontal section within the target formation requires not only understanding of the position of the wellbore within the structure, but also real time evaluation of reservoir properties and fluid saturations.In order to reduce uncertainties in this complex geological environment, the innovative reservoir-scale mapping while drilling technology was utilized for the first time in Yuri Korchagin field. This technology provides an extensive set of deep directional electromagnetic (EM) measurements and has the radius of investigation, exceeding 30 m TVD from the wellbore. The inverted EM measurements are graphically represented as the 2D vertical section along the wellbore with the multiple layers resistivity visualization. The innovative technology, thanks to its large radius of investigation, enabled forecasting and detailed understanding of structural behavior of the target formations, confirmed the oil water contact (OWC) depth and allowed for detection of the faults and their displacement magnitude. Based on the interpretation of the data, obtained with the reservoir-scale mapping technology, the 3D geological model of the field was updated and refined, which served supplementary exploration purpose.At the greater depths, the risk of drilling accidents, associated with narrow safe mud weight window, is increasing. The "well to formation" equilibrium state is impossible without thorough geomechanical modeling and interaction with geology and engineering departments involved in drilling operations. The

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Integrated Approach to Drilling ERD Wells with the Innovative Reservoir-Scale Mapping While Drilling Technology on Korchagina Field

et al. 2015

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The Evolution of Geomechanics Application in the Korchagina Field, North Caspian Sea

et al. 2015

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Production from the periphery of the Korchagina field, a pilot project of Lukoil for offshore development in the Caspian region, is only possible by drilling extended reach (ERD) wells, with extreme lengths of lateral sections exceeding 6 km. The tough geological environment and uncertainties in wellbore stability conditions require real-time updating of the model during drilling, which has helped to update collapsed gradients and optimize mud properties, hole cleaning, and tripping procedures. Implementation of improved geomechanical modeling has led to the successful drilling of a challenging 12.25-in. section after two failed boreholes. Adding 3D calculations to the models demonstrated that with the existing well and casing design, safety was a major factor in wellbore design. The 3D models led to changes throughout the well design. As a result, applying geomechanics in the Korchagina field has produced outstanding results. So far, 21 wells have been successfully drilled with minimal borehole instability issues, including record ERD Wells 103 (TD 8001 m) and 108 (TD 8005m).

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4D Geomechnical Model Creation for Estimation of Field Development Effect on Hydraulic Fracture Geometry

et al. 2016

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A 3D geomechanical model was constructed to estimate the influence of the initially placed propped fractures and the pressure variation with time in active field development on the stress-state redistribution. The main task of paper was to research the different parameters influence on stress state condition and especially on possibility of stress reorientation due to field development. In addition, the main purpose of the paper is to fiend impact of acting processes on hydraulic fracturing propagation. A finite element method was applied to calculate the stress state in a target sector of the oil field. All available seismic data and pertinent well logging data were used to update the geological and hydrodynamic models, and data from hydraulic fracturing, 1D geomechanical modeling, and drilling history were used for verification of the modeling results. In the following paper the reservoir parameters which can be useful for other fields of West Siberia were used. The 3D geomechanical model was created and used for the stress-state redistribution forecast, taking into account the field development history. The model was built by coupling the geomechanical finite element and compositional numerical reservoir simulator result at two time steps –the initial, virgin state and the current state of the field development. It has been shown that the change in reservoir pressure has a significant influence on the value of the horizontal stress in the area of interest, whereas the change in stress orientation depends on the reservoir height, layout of wells, field development stage, and mechanical properties of the rock. Near the initial fractures, the fractures themselves have a strong influence on the magnitude and orientation of the horizontal stress.

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Integration of Methods for Forecasting and Identification of Rock Faults and Fracture Zones to Reduce Risks at their Crossover during Extended Reach Drilling of Long Horizontal Sections (6000 m) in Yuri Korchagin Field

Abstract: This article is based on results of drilling wells in Yuri Korchagin field. Interpretation of the obtained data derived the conclusions that will help to stake future wells in better geological conditions and minimize risks during construction of wells.

Cited by 4 publications

References 1 publication

Integrated Approach to Drilling ERD Wells with the Innovative Reservoir-Scale Mapping While Drilling Technology on Korchagina Field

Integrated Approach to Drilling ERD Wells with the Innovative Reservoir-Scale Mapping While Drilling Technology on Korchagina Field

The Evolution of Geomechanics Application in the Korchagina Field, North Caspian Sea

4D Geomechnical Model Creation for Estimation of Field Development Effect on Hydraulic Fracture Geometry

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