Casing Shear: Causes, Cases, Cures

Dusseault, Maurice B.; Bruno, Michael S.; Barrera, John

doi:10.2118/72060-pa

Cited by 122 publications

(28 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that an accurate corrosion rate calculation can be achieved by first studying the properties of the reservoir and of course the fluids as well [7]. First thing to know is the composition of reservoir fluid samples obtained from drill stem testing (DST).…”

Section: Reservoir Characteristics and Reservoir Fluid Propertiesmentioning

confidence: 99%

“…Only small amounts (<1%) of inorganic impurities (carbon dioxide and nitrogen) were observed in the gas samples and no hydrogen sulfide, H 2 S, was detected in any of the tests, based on measurements during DST and laboratory sample analysis. The Standing-Katz dry gas correlation was used to generate the fluid's PVT properties (gas formation volume factor, B g , and z-factor) and the method fromLee,et al [7]was used to determine gas viscosity. One type of reservoir fluid properties was used across the reservoir.…”

Section: Reservoir Fluid Properties (Pvt Analysis)mentioning

confidence: 99%

See 1 more Smart Citation

Integrated Analysis of Optimizing Tubing Material Selection for Gas Wells

Marbun

Sinaga

Gaol

et al. 2015

J. Eng. Technol. Sci.

View full text Add to dashboard Cite

Abstract.Corrosion in production tubing strings is seen as a challenging problem in gas wells containing carbon dioxideand hydrogen sulfide. This paper presents a new comprehensive method of corrosion rate calculation with integrated study of reservoir condition, nodal analysis of the well, and well trajectory, which could also have an effect due to the possibility of different flow regimes of the production fluid. This method is applicable to evaluate and predict the performance of selected tubing size and material. This method can also give an economic evaluation for the consideration of using corrosion resistant alloy (CRA) or low-alloy steel and carbon steel. The measurement of corrosion rate can be done by several methods,such as using corrosion coupons, calculating the iron content inside the production fluid, or probes. Either way, when the corrosion rate measured in the field is still below the acceptable maximum corrosion rate, it can be said that the adequacy of this method is guaranteed. This method has been implemented in a gas field,where it successfully selected the best tubing material for the next development well in this field. Consequently, the lifetime of the tubing strings could be extended,resulting in an economical benefit as well.

show abstract

Section: Reservoir Characteristics and Reservoir Fluid Propertiesmentioning

confidence: 99%

Section: Reservoir Fluid Properties (Pvt Analysis)mentioning

confidence: 99%

Integrated Analysis of Optimizing Tubing Material Selection for Gas Wells

Marbun

Sinaga

Gaol

et al. 2015

J. Eng. Technol. Sci.

View full text Add to dashboard Cite

show abstract

“…At the same time, environmental impacts induced by the hydraulic fracturing have been raised, for example, contamination of ground water, unstable growth of the hydraulic fractures, seismic risks and reactivation of existing faults, and soil contamination due to proppant chemicals (Zoback et al, 2010). Dusseault et al (2001) also studied compaction-induced shear failure of the vertical well by fluid production. Shear failure is one of the typical mechanisms of well instability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of possible wellbore cement failures during hydraulic fracturing operations

Kim

Moridis

Martínez

2016

Journal of Petroleum Science and Engineering

View full text Add to dashboard Cite

We model and assess the possibility of shear failure, using the Mohr-Coulomb model -along the vertical well by employing a rigorous coupled flow-geomechanic analysis. To this end, we vary the values of cohesion between the well casing and the surrounding cement to representing different quality levels of the cementing operation (low cohesion corresponds to low-quality cement and/or incomplete cementing). The simulation results show that there is very little fracturing when the cement is of high quality.. Conversely, incomplete cementing and/or weak cement can causes significant shear failure and the evolution of long fractures/cracks along the vertical well. Specifically, low cohesion between the well and cemented areas can cause significant shear failure along the well, but the same cohesion as the cemented zone does not cause shear failure. When the hydraulic fracturing pressure is high, low cohesion of the cement can causes fast propagation of shear failure and of the resulting fracture/crack, but a highquality cement with no weak zones exhibits limited shear failure that is concentrated near the bottom of the vertical part of the well. Thus, high-quality cement and complete cementing along the vertical well appears to be the strongest protection against shear failure of the wellbore cement and, consequently, against contamination hazards to drinking water aquifers during hydraulic fracturing operations.

show abstract

“…In particular, compaction in undrained condition such as low permeability induces the increase of pore-pressure, which can change effective stress fields significantly and may result in geological failure (Kim et al, 2012a). Compaction-induced shear failure by fluid production was also studied by Dusseault et al (2001) and Bagheri and Settari (2008).…”

Section: Introductionmentioning

confidence: 99%

Gas Flow Tightly Coupled to Elastoplastic Geomechanics for Tight- and Shale-Gas Reservoirs: Material Failure and Enhanced Permeability

Kim

Moridis

2014

SPE Journal

View full text Add to dashboard Cite

We investigate coupled flow and geomechanics in gas production from extremely low permeability reservoirs such as tight and shale gas reservoirs, using dynamic porosity and permeability during numerical simulation. In particular, we take the intrinsic permeability as a step function of the status of material failure, and the permeability is updated every time step. We consider gas reservoirs with the vertical and horizontal primary fractures, employing the single and dynamic double porosity (dual continuum) models. We modify the multiple porosity constitutive relations for modeling the double porous continua for flow and geomechanics. The numerical results indicate that production of gas causes redistribution of the effective stress fields, increasing the effective shear stress and resulting in plasticity. Shear failure occurs not only near the fracture tips but also away from the primary fractures, which indicates generation of secondary fractures. These secondary fractures increase the permeability significantly, and change the flow pattern, which in turn causes a change in distribution of geomechanical variables. From various numerical tests, we find that shear failure is enhanced by a large pressure drop at the production well, high Biot's coefficient, low frictional and dilation angles. Smaller spacing between the horizontal wells also contributes to faster secondary fracturing. When the dynamic double porosity model is used, we observe a faster evolution of the enhanced permeability areas than that obtained from the single porosity model, mainly due to a higher permeability of the fractures in the double porosity model. These complicated physics for stress sensitive reservoirs cannot properly be captured by the uncoupled or flow-only simulation, and thus tightly coupled flow and geomechanical models are highly recommended to accurately describe the reservoir behavior during gas production in tight and shale gas reservoirs and to smartly design production scenarios. IntroductionUnconventional natural gas such as tight and shale gas has become an increasingly important source of natural gas in the United States over the past decade and the estimates of the natural gas resource potential for shale gas range from 14.16×10

show abstract

Casing Shear: Causes, Cases, Cures

Cited by 122 publications

References 15 publications

Integrated Analysis of Optimizing Tubing Material Selection for Gas Wells

Integrated Analysis of Optimizing Tubing Material Selection for Gas Wells

Investigation of possible wellbore cement failures during hydraulic fracturing operations

Gas Flow Tightly Coupled to Elastoplastic Geomechanics for Tight- and Shale-Gas Reservoirs: Material Failure and Enhanced Permeability

Contact Info

Product

Resources

About