Rock Physics SIG: Look Ahead, Pore Pressure Prediction While Drilling* - Oct 4th
Sponsored by CGG and Ikon Science
Event Location:
CGG
10300 Town Park Dr.
Houston, TX 77072
NOTE: You Must be Logged in to Register
5:15pm Refreshments
5:30pm Presentation Begins
6:30pm Adjourn
Speaker: Giuseppe De Prisco, Statoil
When drilling in an overpressured formation, the mud weight (i.e., the weight of drilling fluids transmitted to the borehole) must be in the right range to maintain borehole stability. Stability is required to avoid undesirable situations such as loss of drilling fluids into high permeability formation or complete loss of circulation, fracturing of the formation, or blow-out. The worst case of either complete circulation loss or blow-out, may result in loss of the well and/or injury to personnel operating the drilling rig. Accordingly, for safe and economic drilling, it is essential that the pore pressure, or sudden pore pressure increases, is predicted with sufficient time while drilling.
Conventional technology (e.g. Bowers, 1995; Eaton, 1975) only addresses and infers pressure magnitude in a shale lithology up to the depth where data are available. As such, it does not predict ahead of the drill bit the presence of a high overpressure sediments, or only predicts the presence of a sudden pressure increase within tens of meters from the drill bit (e.g., Wang et al., 2007)
With the present work we identified a predictable relationship between resistivity and porosity (derived from density) that occurs up to 100-300 meters above an over-pressured formation (e.g sand) in the overlying shales. The relationship can be recognized with proper scaling and cross plotting of the logs. With this knowledge, a two-warning system has been developed that while drilling allows the identification of these overpessured layers hundreds meters above them.
Biography: Giuseppe De Prisco, Statoil
Giuseppe De Prisco received a Dr. Eng. (Laurea) in electronic engineering from University of Napoli Federico II, Italy, and a M.S. in fluid dynamics from the CRS4 Research Center in Cagliari, Italy. After working as researcher at the ICEMB consortium (Italy) and as engineer in the aeroacoustics and aerodynamics group at CRF (FIAT Research Center, Torino, Italy), he received a Ph.D. in mechanical engineering from University of Maryland (USA), where he specialized in computational simulations of turbulent flows. In 2007 he joined the advanced physics group at EXA Corporation (Burlington, MA) where he worked as physicist, implementing numerical algorithms to simulate multiphase flows in fuel cells and porous media. In 2010 he joined the physics development team at Ingrain Inc (Houston, TX), where he worked on digital rocks physics. Currently he works as principal geoscientist at Statoil (Houston, TX). He has 5 issued patents in different countries and 3 pending patents within topics of multiphase flow in porous media, digital rock physics and pore pressure predictions.
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