【摘 要】
：
Wellbore failure can occur at different stages of operations.For example,wellbore collapse might happen during drilling and/or during production.The drilling process results in the removal of an already stressed rock material.If the induced stresses near
【机 构】
：
Schlumberger, Geomechanics Center of Excellence,Buckingham Gate, Gatwick Airport RH6 0NZ, UK
论文部分内容阅读
Wellbore failure can occur at different stages of operations.For example,wellbore collapse might happen during drilling and/or during production.The drilling process results in the removal of an already stressed rock material.If the induced stresses near the wellbore exceed the strength of rock,wellbore failure occurs.The production process also changes the effective stresses around the wellbore.Such changes in stresses can be significant for high drawdown pressures and can trigger wellbore failure.In this paper,the Mohr-Coulomb failure criterion with a hyperbolic hardening is used.The model parameters are identified from triaxial compression tests.The numerical simulations of laboratory tests showed that the model can reproduce the mechanical behaviour of sandstone.In addition,the simulations of multilateral junction stability experiments showed that the model was able to reproduce yielding and failure at the multilateral junction for different levels of applied stresses.Finally,a numerical example examining multilateral junction stability in an open borehole during drilling and production is presented.The results illustrate the development of a localized failure zone proximate to the area where two wellbore tracks join,particularly on the side with a sharp approaching angle,which would significantly increase the risk of wellbore collapse at the junction.
其他文献
When low-salinity water containing sulfate ions is injected into carbonate reservoirs,rock dissolution and in situ precipitation occur,altering rock permeability and wettability.Particularly,when barium ions are present in formation water,they react chemi
We developed an inversion technique to determine in situ stresses for elliptical boreholes of arbitrary trajectory.In this approach,borehole geometry,drilling-induced fracture information,and other available leak-off test data were used to construct a mat
Supported ionic liquid (IL) catalysts [Cnmim]3PMo12O40/Am TiO2 (amorphous TiO2) were synthesized through a one-step method for extraction coupled catalytic oxidative desulfurization (ECODS) system.Characterizations such as FTIR,DRS,wide-angle XRD,N2 adsor
Owing to the increasingly serious environmental issues caused by the sulfur burnt in fuel,desulfurization has become an important topic.In this work,an amphiphilic oxygen-defective tungsten oxide was synthesized by a colloidal chemistry method.The amphiph
Deep eutectic solvents (DESs) are a new class of green solvents analogous to ionic liquids due to their biodegradable capacity and low cost.However,the direct extractive desulfurization of diesel oil by DESs cannot meet the government\'s standard.In thi
With the aim of deep desulfurization,silica-supported polyoxometalate-based ionic liquids were successfully prepared by a one-pot hydrothermal process and employed in heterogeneous oxidative desulfurization of various sulfur compounds.The compositions and
Adsorbent regeneration is critical for a continuous adsorption-regeneration process and often underestimated.In this work,the regeneration of bifunctional AgxO@SBA-15 for [O]-induced reactive adsorptive desulfurization of liquid fuel is reported and furth
Hydraulic fracturing technology can significantly increase oil production from tight oil formations,but performance data show that production declines rapidly.In the long term,it is necessary to increase the development efficiency of block matrix,surfacta
To improve the rate of penetration (ROP) in drilling deep and hard formations,this paper proposes a new drilling method called coiled tubing partial underbalanced drilling (CT-PUBD).As a preliminary investigation into the new drilling method,this paper pr
To investigate the efficiency and stability of Venezuela\'s oil-oriented economy,this paper applied entropy to the analysis.Based on this method,Venezuela\'s oil-centered industry,inefficient regulatory system,and insensitive response to external chan