... by pressure drawdown. In our example, a 5 MPa depressurization is causes gas hydrate dissociation. This decrease in pore pressure increases the effective stresses which causes significant compaction, decrease in reservoir permeability, and perturbs stresses near the wellbore. The viscoplastic behavior...

... system subsea system caisson suction caisson anchor loading constitutive model turbine pga effective stress seismic loading excess pwp suction anchor rmw model offshore wind turbine displacement padeye seismic peak ground acceleration Introduction The U.S. West Coast has...

... Abstract We predict pressure and stress in the 3D Mad Dog field using the Full Effective Stress (FES) pressure-prediction workflow. The FES workflow incorporates the full stress tensor (e.g., lateral stress and deviatoric stresses) into pressure prediction: it uses a geomechanical model...

.... The prototype-scale pipe–soil interaction problem was modeled using the Coupled Eulerian–Lagrangian method. Effective stress based dense sand constitutive behaviors were simulated using a modified Mohr-Coulomb model. The pipe–soil interaction was tested under backpressure and with loading speeds comparable...

... Abstract Cyclic loading caused by earthquake in sandy soils often leads to the development of positive pore pressures. In extreme conditions, the pore pressure may increase until reaching a state of zero effective stress associated with a dramatic reduction of the soil shear stiffness...

... the effective and total stress acting on the reservoir and on the surrounding rocks (Addis, 1997; Hatchell et al., 2003, Toomey et al. 2017). Furthermore, such effective stress changes can now be detected using time shifts from time-lapse seismic surveys (Segall, 1989 & 1992; 2 OTC-28628-MS Hatchell et al...

...) simulation, was adopted to advance the understanding of the interaction between reservoir depletion, proppant particle compression, and single-/multiphase flow in a hydraulic fracture. PFC was used to simulate effective stress increase and the resultant proppant particle movement and rearrangement during...

... simulation experiment equation radial pressure soil layer upstream oil & gas change rule lateral friction soil body experiment coefficient pore water pressure effective stress stress state water pressure excess pore water pressure modeling & simulation shear strength offshore...

... is a comprehensive interpretation method, in which porosity, shaliness and effective stress are taken into account. The other is a multi-regression method with the consideration of P-wave velocity, affected by shallow gas velocity and shallow flow velocity, and mathematical model is established by multi-regression...

... positive factor to account for in future pile design practice. pile installation deposit failure load test site test pile sand deposit variability effective stress reference time upstream oil & gas shaft capacity consolidation karlsrud geotech plasticity index femern shaft...

... Abstract For gas hydrate production, gas hydrate-bearing sediments should be depressurized below the gas hydrate equilibrium pressure. Gas hydrate-bearing sediments are compacted during the depressurization process because additional effective stress evolves due to a decrease in pore pressure...

... and gravel pack components are also important parts of this simulation. A finer mesh is used for these components as shown in Figure 5. Material properties The initial vertical effective stress was calculated with wet densities of 1750 kg/m3 (clay layer), 2000 kg/m3 (methane hydrate beaing layer) and 1250 kg...

.... This database contains data gathered from 17 subsalt wells and includes definitive pore pressure and effective stress directly pertinent to the subsalt sediments. Velocity and resistivity data were then crossplotted against effective stress to define the correlation among these variables. Based on several forms...

... intelligence offshore technology conference overpressure reservoir characterization salt body pore pressure pore-pressure prediction effective stress application general velocity model mechanism real time system upstream oil & gas subsalt sediment velocity model sediment pore-pressure...

... the carbonates. The approach requires that the inverted data be separated into the shale and carbonate velocity trends to allow the shales to be used for effective stress prediction while the complete velocity field is used for time-depth conversion. These studies have revealed that pore pressure prediction from...

..., and cation exchange capacity (CEC, meq/g). CEC is a measurement of the amount of exchangeable charge per unit mass of dry sample. The specific components of compaction are mechanical, governed by effective stress; thermal, associated with increasing temperature due to the geothermal gradient, and chemical...

... to regions of low overburden before they are expelled into the overlying sediment. This creates characteristic distributions of rock properties, fluid pressure, effective stress, temperature, and fluid chemistry in the aquifers and bounding mudstones. This simple process can cause slope instability near...

... adjacent to the pipe, formed of the displaced soil, has been explored. The solutions and guidance provided in this paper allow pipeline designers to estimate the ‘set-up’ periods over which the effective stress at the pipe-soil interface will rise in the period after laying, indicating the build-up...

... of a pipeline. pore pressure piping design model test pipeline excess pore pressure friction factor pipe weight effective stress pipe displacement lateral resistance otc 20096 lateral buckle centrifuge test assessment resistance upstream oil & gas embedment offshore technology...

... of gas productivity and economical efficiency, compared with the other in-situ dissociation processes of MH. However, increase of effective stress during depressurization causes consolidation of MH sediments and permeability reduction. As a result, reduction of gas productivity is also supposed...