1887

Abstract

Abu Dhabi land has a giant gas field consisted of layered carbonate reservoirs. The long term plan of the field has been to produce the reservoirs with the safest maximum depletion. A detailed geomechanical study was undertaken to identify changing field stresses and to understand the possible reservoir rock collapse mechanisms. The foundation for any 3D geomechanical modeling is 1D Mechanical Earth Model that includes elastic and strength properties, overburden stress, pore pressure and magnitude and direction of horizontal stresses. The input data for 1D modeling is openhole logs (density and compressional and shear sonic logs). Image data, caliper logs, pore pressure and closure and breakdown pressure measurements are necessary to calibrate the models. To improve quality and reliability of the 1D MEMs, Abu Dhabi Company for Onshore Oil Operations (ADCO) requested lab measurements to calibrate elastic and strength rock properties and decided on pore pressure and stress measurements in one of the upcoming wells. Wireline Formation Tester (WFT) technique was selected to provide pore pressure, as well as closure pressure to calibrate magnitude of minimum horizontal stress directly and breakdown pressure to calibrate magnitude of maximum horizontal stress indirectly. Acquired compressional and shear sonic logs allowed building continues properties, pore pressure and stress profiles. The integrated study yielded calibrated stress profiles and enhanced geomechanical modeling for the reservoir intervals. The measured closure pressure indicated significant magnitude variations of the minimum horizontal stresses across production units suggesting existing of stress barriers at various levels. The amount of stress anisotropy at particular reservoir intervals was determined. The stress profiles indicated good fracture containment at various levels and identified potential applications for injection or multi-stage fracture design in vertical and horizontal wells for efficient reservoir drainage.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609-pdb.395.IPTC-17213-MS
2014-01-19
2024-03-29
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.395.IPTC-17213-MS
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error