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- W2008690717 abstract "Abstract Even though the seismic while drilling (SWD) tool is coupled to the Bottom Hole Assembly like a standard tool its operation and setup is far from standard. It requires proper planning ahead of the acquisition and a proper understanding of the full potential of the data to make this service a powerful drilling decision tool. The SWD full value can only be attained through a holistic approach. This paper will discuss the necessity of effective communication and planning for the successful outcome of a complex SWD operation. A proper time line, project management and focus on all parties involved are essential for the SWD operation to be successful without disturbance of the drilling operation. SWD has the potential of producing a real time update to the geological model. It offers improved resolution and more accurate depth conversion. Due to the flexibility of source/receiver positioning several other geophysical applications will be possible. Salt flank and fault plane imaging are two examples of these applications. The challenges encountered for alternative source/receiver positions will be analyzed. The SWD service has the potential of becoming a key drilling decision tool. The necessity of applications, resources, cooperation and decisions will be analysed. The need for developing a team effort and common set of tools is described. Uncertainties in data quality coupled with surface seismic limitations lead to a risk management process. This requires a proper understanding of the workflow of seismic processing and reservoir properties to minimize time for data preparations prior to evaluation and decisions. Introduction Seismic while drilling can be performed in a normal ray path and reverse ray path methodology1. In the reverse ray path configuration the source is in the hole and the receivers on the surface. In the normal ray path the source is on the surface while the receivers are in the hole. The Halliburton SWD service is a normal ray path solution whereby the tool is a set of receivers on the Bottom Hole Assembly (BHA)2. This paper is based on a field test conducted for Norsk Hydro on the Oseberg field in May 2006. As an acoustic tool the SWD operation requires a quiet environment to perform the acquisition. To attain this quiet environment standard drilling activity needs to stop. A natural stop in drilling, including stopping mudpumps, happens during stand changes. A stand change requires between 2 and 10 minutes which provides a sufficient amount of time for 3 to 5 shots to be fired. It is however too short a time to reposition the source with current technology. The source location could be either connected to the rig or at an offset from the rig. As an offset position a boat connected source or a seabed positioned source are the alternatives. Alternative source technology needs to be further developed for the SWD to be a 3D VSP alternative. Vertical Seismic profiling (VSP) is a technology that improves the surface seismic resolution. It is a considerable risk to performing a drilling campaign based on surface seismic alone. As such a VSP will reduce this risk. In order for VSP to have this capability the data needs to be available in time before the reservoir zone is approached. The earlier the data is available the bigger impact the data will have on the risk reduction. Acquiring the VSP data and making it available in due time for drilling impact is the key objective for the SWD solution. Communication between different professional groups in a drilling process is a challenge. The preparation of different environments of the different elements of operation is important to minimize obstructions and hazards while drilling. The planning process includes making the different operational elements aware of the setup and functionalities of a SWD survey. Different risk scenarios need to be analyzed and agreed to before the survey is conducted." @default.
- W2008690717 created "2016-06-24" @default.
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- W2008690717 date "2007-11-11" @default.
- W2008690717 modified "2023-10-15" @default.
- W2008690717 title "Seismic-While-Drilling Operation and Applications" @default.
- W2008690717 doi "https://doi.org/10.2118/109893-ms" @default.
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