Utilization of Geomechanics for Medusa Field Development, Deepwater Gulf of Mexico
- Richin Chhajlani (Baker Atlas) | Ziqiong Zheng (Baker Atlas) | David Mayfield (Murphy E & P) | Bruce MacArthur (Murphy E & P)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 29 September-2 October, San Antonio, Texas
- Publication Date
- Document Type
- Conference Paper
- 2002. Society of Petroleum Engineers
- 5.7 Reserves Evaluation, 1.6.10 Running and Setting Casing, 1.10 Drilling Equipment, 5.6.9 Production Forecasting, 5.5.11 Formation Testing (e.g., Wireline, LWD), 1.6.9 Coring, Fishing, 4.1.2 Separation and Treating, 5.1.2 Faults and Fracture Characterisation, 7.3.3 Project Management, 1.6 Drilling Operations, 4.1.5 Processing Equipment, 3 Production and Well Operations, 2.4.3 Sand/Solids Control, 1.8 Formation Damage, 1.2.2 Geomechanics, 5.6.1 Open hole/cased hole log analysis, 2.2.2 Perforating, 1.7 Pressure Management, 5.3.4 Integration of geomechanics in models, 5.1.6 Near-Well and Vertical Seismic Profiles, 1.14 Casing and Cementing, 1.1 Well Planning, 2.4.6 Frac and Pack, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 3.2.5 Produced Sand / Solids Management and Control
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The scope of applied geomechanics in the petroleum industry has been on the rise over the past decade. Geomechanics analysis has shown to increase the overall value to various projects and create positive technical synergies between various groups involved with project development. This paper highlights a comprehensive geomechanics study carried out on a deepwater Gulf of Mexico (GoM) field for optimizing field development with respect to critical drilling, completion and reservoir issues. A detailed and well-calibrated wellbore stability model applied to the Medusa field has shown to reduce the drilling operational costs by enhanced well planning. The log-based geomechanics models used to evaluate sand production and pressure dependent pore volume compressibility have aided in reducing project risks and increasing project life. The intent of the paper is to show the practical risk reduction and cost savings that are possible through geomechanics analyses in high-cost, high- risk projects in deepwater arenas such as the Gulf of Mexico.
Operations in deepwater are costly and time sensitive requiring optimum well construction design. Incorrect engineering analysis can affect the Net Present Value (NPV) of the project and also setback the future project objectives. In order to reduce operations and engineering uncertainties, a detailed geomechanics study was conducted for the Medusa field. The two main objectives of the study were:
Cost saving during operations
Risk estimations, project planning and optimization.
The deliverables for the geomechanics study were based on:
Drilling issues comprised of wellbore stability analysis for the development well program.
Completion issues relating to prediction of sand production and completion strategies.
Reservoir management issues consisting of pore volume compressibility determination for various pay sands.
Wider utilization of the study by mapping the mechanical characteristics of the reservoir, overburden and other relevant formations, to assist with frac and pack design and subsidence prediction.
An extensive array of drilling, logging, core and reservoir data from the few existing exploratory wells in the field provided the necessary framework and calibrations to characterize in-situ stresses, formation mechanical behavior and mechanisms of potential borehole instability.
The wellbore stability analysis, consisting of mud weight window prediction and optimal well trajectory analyses, was carried out for five of the development wells. The success of utilizing this stability analyses for two of the recently drilled wells are discussed, highlighting the value of conducting such studies on high impact wells.
Sand production prediction was carried out for all the main sand packages identified and encountered by the existing wells in the field. Formation compressive strengths and other mechanical parameters were computed every 0.5ft across the entire pay zones using a proprietary log-based prediction/simulation program. Critical drawdown pressures to predict sanding potentials were derived based on the static mechanical properties and expected flow conditions. Such detailed depth-based sand production prediction aided the project engineers in determining optimal production as well as completion strategies.
|File Size||1 MB||Number of Pages||12|