Structural imperfections in synthetic diamond single crystals prepared by the HPHT method
Structural imperfections in synthetic diamond single crystal prepared under high temperature and high pressure (HPHT) in the presence of a Fe65Ni35 catalyst have been examined with transmission electron microscopy (TEM) and moire patterns. The existence of stacking faults, concentric dislocation loops and an array of dislocations in the diamond was suggested. The formation mechanism of these structural imperfections was analyzed briefly. It was found that the structural imperfections originate from an excess amount of saturated vacancies and internal stresses associated with inclusions in the diamond.
Summary In the pilot study, a new geomodeling technology is presented for developing 3D heterogonous geomodels for Athabasca McMurray (MCMR) oil sands. The geomodels were used to simulate SAGD thermal recovery. Both conventional SAGD completions and SAGD with ICD completions were tested. The simulation results show that for a heterogeneous Athabasca McMurray oil sand reservoir, the ICD completion technology enhances oil production and reduces steam consumption. As a result, the economics of SAGD recovery from the heterogeneous sands is improved.