Hydraulic fracturing induced casing shear deformation and a prediction model of casing deformation

Fracture Dynamic Propagation Model of High-Energy Gas Fracturing for Casing Perforated Well

The onshore oil and natural gas industries of China have started a large-scale development when crude oil reserves have been difficult to recover. The stratum fracture modification is an indispensable measure to efficiently develop oil and gas fields. Hydraulic fracturing is the most important reservoir stimulation technique, but it is still faced with various problems such as the failure to fr...

Shear-Induced Homogeneous Deformation Twinning in FCC

The {111}<11 2 > shear stress-displacement behavior for face-centered cubic (fcc) metals, aluminum and copper, is calculated using empirical potentials proposed by Mishin and by Ercolessi, based on the embedded atom method (EAM), and compared with published ab initio calculations. In copper close agreement is observed in the results given by the Mishin potential for both the ideal shear strengt...

ABC Analysis Behind Casing

The influence on casing stress for shale gas fracturing wells considering thermo-pressure coupling effect

The casing deformation problems are presented over 36 wells (among 112 horizontal wells by 2016) during fracturing processes in Weiyuan-Changning shale gas play in China.1 Subsequent tools could be blocked in the wellbore.2–4 The segments with serious deformation had to be abandoned before completing fracturing operations.5 The casing deformation issues make a great influence on production of s...

Shear-Induced Deformation and Desorption of Grafted Polymer Layers

We describe the behaviour of grafted polymer layers in strong solvent shear flows within a model where only a subset of chains are exposed to the flow (hence to the tension arising from hydrodynamic drag forces), leaving the remainder protected. We show that for quite small values of the shear rate, I, the system reaches a self-regulating state where the lowest possible fraction of grafted chai...