Objective
The innovative Geobit-EXT technology of seismic-while-drilling, by using the drilling noise, was built up starting from the (currently remaned "Seisbit") technology developed by OGS and Eni-AGIP during previous projects partially supported by the E.C. and from the technology developed by PROSOL. The project is aimed at demonstrating the use of the innovative Geobit-Ext technology in wells drilled with PDC bits and also in deviated wells, in order to:
- position the bit in time
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The fifth semester involved the application of the technology which was refined through the analysis of PDC results obtained in the previous project applications both in favourable and unfavourable conditions. The fifth semester project activity was dedicated to acquiring it from the geological and technical point of view. As foreseen in the project program, in order to demonstrate the method using while drilling results based on PDC signals obtained under different conditions, the site choice was a well drilled in most of its parts with PDC bits in soft and unconsolidated formations.
The acquisition phase was realised with downhole motor drilling, starting from a depth of about 2000/KB and was concluded at the 4500 meter/KB depth. During the survey, simultaneous surface and downhole measurements were executed. The while drilling results have been processed in the field using the Geobit-EXT prototype reinforced with 57 Gbytes auxiliary disk memory to allow on-line access to the acquired raw field data. This was done to allow while drilling signal-to-noise analysis of pre-stacked correlated data and multichannel pre-processing to reinforce the PDC signal. This was especially aimed at enlarging the PDC signal bandwith. The evaluation of the results has been used since the while drilling phase. During the intermediate drilling, particular attention was dedicated to obtain the check shot analysis starting from PDC direct arrivals from near offset-traces. This information is even more important, because of the typical reduction of rock cuttings geological information when drilling with PDC bits. The restricted signal bandwith and the presence of coherent noise required a multioffset analysis to enable the data processing and picking. The PDC while drilling results obtained in unconsolidated rocks had been confirmed by the well results and by a conventional VSP run after the end of the drilling. PDC reflection results in soft rocks are under evaluation to confirm the PDC reflection results already obtained under favourable conditions.
An important feature of the already demonstrated Seisbit method is the good quality of the results obtained so far with the use of roller cone bits. In fact, both teeth or insert roller bits typically generate vibration wavefields from which signal exploitation and its comparison with the surface seismic is not difficult, and is robust enough to be immediately used in applications to the oil industry. Polycrystalline Diamond Compact bits (PDC) act as abrasive (friction) tools, and the content of the radiated vibration is quite different. In this case, the drill-bit method generally gives less energetic axial seismic signals, with results that depend also on the type of PDC bit and on operational conditions. On the other hand, PDC bits are widely used, and a large and increasing number of offshore and onshore wells are drilled using PDC bits.
The innovative aspect of the project is the use of drill-bit vibrations by improved Geobit-Ext technology suited to this non-conventional seismic. The technology is, in fact, under demonstration when using not only tricone bits but also PDC bits to give useful real-time information and reverse VSP measurement as a standard for the MWD seismic method. This goal is following from a series of applications around wells drilled exclusively with PDC or with PDC and tricone bits (in different operational contexts, and also in deviated wells), and from refining, using the recently demonstrated and improved technology, of the acquisition and processing parameters. Thus, the main results of the project will be the ability to identify and use, on a large scale, even the low level axial torsional PDC signal, and to acquire and process it to enhance the signal content, improve signal bandwith, giving real-time seismic results useful to exploration and drilling, even in unfavourable but common contexts, with a consequent enhancement of the global Performance/Cost ratio due to the increased applicability of the MWD seismic.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Coordinator
34010 Sgonico
Italy
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