fax 01-972-952-9435. AbstractAchieving the objectives of drilling horizontal wells is greatly dependent on accurate placement of the drainhole in the reservoir. Careful pre-job planning using offset well data and seismic maps helps to reduce the uncertainty to some extent. However, the unpredictability of structural and stratigraphic variation between the planned and offset wells and uncertainty inherent in seismic data are always associated with horizontal well planning. The formation dips computed from seismic and offset wells are therefore prone to some degree of error.Advances in real-time data transmission technology have made it possible to transmit image data uphole while drilling, through improving the robustness of the real-time signal, signal bandwidth and data compression. Logging-whiledrilling (LWD) real-time azimuthal resistivity images can be used for accurate estimation of the dip and strike of formations intersected along the well trajectory. In addition, structural surprises such as faults can be detected, and remedial actions taken immediately. Such information is of great value in making geosteering decisions while drilling into reservoirs within structurally complex geology or in an area with sparse geological information. Using image data, trajectory adjustments can be made during drilling yielding optimal well placement.We descibe the use of real-time image interpretation during the drilling of two horizontal wells within a block bounded by major faults on the north and south, with a series of smaller associated faults, anticipated but not confirmed prior to drilling from existing data, in a carbonate field in United Arab Emirates. The image data provided crucial input to guide the well trajectory through the target reservoirs resulting in the wells objectives being achieved. In addition, the image data clarified the regional geology of the area around the wells, thus helping to update the geological model for better description of the structurally complex reservoir.
Abu Dhabi Company for Onshore Oil Operations (ADCO) has recorded the lowest Total Recordable Case Frequency (TRCF) of 0.52 in its history. This is also a drilling worldwide record and it was achieved, despite ADCO have increased its drilling fleet by around 30%. This successful score could not have been achieved without proper planning and implementation of the new rigs, especially with limited resources and through very tight schedule to meet ADCO's business plan requirements.An assessment to our project leads us to collect all the inputs related to the best way for the safe start up of the rigs. Taking in consideration the changes in design and shortage in crew staff, we have built a detailed plan for the safe start up rigs with all the parameters such as human recourses, management involvement, and technical inspections. Furthermore, we have developed plan to be in three stages: commissioning, rig move, and rig spud for the first well. Being HSE the focus with the start up of the new rigs, the main challenge faced by the project team was to ensure the implementation of every step in our HSE plan. This allowed us to safely start up the new rigs while delivering the required operational performance despite the fact of staffing the rigs with about 50% green hats crews. For both operator and contractor, the responsibility for safety, health of workers and environment has increased due to considerable impact of strategic growth plans and additional workload. For the major projects like rig expansion we have applied the best functional planning for safety management system. This paper will discuss and review the methodology for the rig start up plan and implementation of the primary actions needed to be developed and monitored through minimizing the risk and the impact to the project cost and schedule. Success, failures, and lessons learned are highlighted through the sections in order that full knowledge of the current project is captured and mitigated in the ongoing expansion with additional rigs being ordered. This will enable ADCO to enhance HSE commitments ensuring new rigs are delivered ahead of time.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe objective of this paper is to present the use of real-time image interpretation during an intensive drilling campaign of horizontal wells in two major carbonate fields onshore Abu Dhabi.
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