... is the yield function. Fracture criterion The function of Drucker-Prager criterion is [ 7 – 9 ] : (11) f ( I 1 , J 2 ) = J 2 − α I 1 − k = 0 (12) f ( σ σ , τ σ ) = τ σ − 6 α σ σ 2 k = 0 Where...

... formation stability coefficients respectively based on Mohr-Coulomb yield criterion and Drucker-Prager yield criterion is presented. Stress around perforations and Drucker-Prager yield criterion are used to establish a sand production prediction model and prediction software was programmed. Finally...

... approaches, reservoir management and other methods exist to reduce the frequency or rate of casing shear. upstream oil & gas deformation well damage structural geology compaction geomaterial criterion shear overburden shear slip magnitude injection reservoir geomechanics subsidence...

... mechanism miscibility society of petroleum engineers flooding criterion slim-tube test reservoir oil SPE 50917 Society of Petroleum Engineers In-Door Study of Hydrocarbon Miscible Flooding Cases Shen Pingping, SPE, and Shi Wen, Research Institute of Petroleum Exploration and Development of CNPC...

... Abstract A method for estimating the borehole pressure or mud weight, required for maintaining the stability of a deviated wellbore, is presented in this paper. The critical borehole pressure is calculated by incorporating elastic stresses on the hole surface into a failure criterion...

... the similitude rule of annular effect, and derives formulas representing the three criteria. It also recommends the index for evaluating the annular effects, and presents how to select the rheological parameters and the circulation rate. dynamic pressure criterion standard cutting cutting drilling...