Determining the strata and surface movement of deep mining can provide a scientific basis for wellbore protection mine land utilization. In this paper, numerical simulation methods were employed to investigate stratum boundary curves caving backfilling mining. The findings be concluded in three aspects. First, boundaries all curved conformed an exponential function, but influence range differen...

The mechanical damage and failure of cement sheaths in gas storage wells under cyclic loading have been studied extensively. However, because the test device cannot restore wellbore condition, most studies theoretical or regular experimental. If load-bearing mode stress environment a differ from those wellbore, then modes will deviate what occurs actual wellbore. Therefore, it is necessary to e...

Abstract The interaction between hydraulic fractures (HF) and natural (NF) is one of the most fundamental phenomena in fracturing. near-wellbore HF NF significantly affects fracking-related operations including injected fluid flow, proppant transport well productivity. However, nature fracturing modes, combined with hydro-mechanical coupling, poses great difficulties challenges addressing this ...

in this paper, nonlinear vibration and instability response of an embedded pipe conveying viscose fluid is investigated. the pipe is considered as a timoshenko beam embedded on an elastic foundation which is simulated by spring constant of the winkler-model and the shear constant of the pasternak-model. the external flow force, acting on the beam in the direction of the flexural displacement is...

The Y oilfield reservoir is characterized by ultra-depleted and multiple pressure systems in each well section. If conventional PLUS/KCL drilling fluid used directional drilling, the following problems are found: rheological stability of not sufficient, resulting increased viscosity thickening after aging, single plugging material may cause loss-circulation when differential more than 26 MPa, p...

SUMMARY Fractures are ubiquitous in Earth’s upper crust and strongly affect its physical properties. Their visibility for elastic waves hinges on their stiffness, a measure of the relation between changes fracture aperture applied stress, which itself significantly increases with increasing stress according to laboratory data. We constrained normal stiffness (and dependence) two fractures inter...