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Keywords: cement
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0092
... ABSTRACT: The accurate prediction of cement failure is significant to maintain wellbore integrity. In the downhole situations, the failure criteria widely used for rock are not guaranteed to be suitable for cement. Till now, seldom researchers have paid attention to the right choice of...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0439
... ABSTRACT: The Gulf of Mexico (GoM) is home to more than 50,000 oil and gas wells with approximately 30,000 wells that are plugged and abandoned leading to concerns of oil and gas leakage where currently, little to no monitoring is performed. The cement used when completing and eventually...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2044
..., underground caves and sea cliffs. These calcarenites are poorly graded and dense, irregularly cemented, light yellow coloured and mainly composed of bioclasts. Throughout the region, these rock materials exhibit spatial (both horizontal and vertical) variability as a consequence of a complex depositional...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2019
...-material specimens consisting of rock-cement, cement-casing and casing-plug interfaces. Consequently, cohesive zone traction separation laws (TSL) are developed considering appropriate constitutive material and interfacial properties. An approach to utilize fully coupled, 3-D global and sub finite element...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2082
... ABSTRACT: Gas leakage through wellbores is one of the major challenges in Oil and Gas Industry related to well cementing and wellbore integrity, whether post CO2 injection or during gas production in hydraulically fractured shales. The inadequate cement bond at the interfaces with formation...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1544
... ABSTRACT: Increasing complexity, environmental regulations and the need for economic efficiency requires long term integrity of wellbores more than ever. A cement sheath's primary function is to maintain wellbore integrity by providing total isolation from surrounding formations and the...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1769
... ABSTRACT: The state of stress in the cement of a completed well's annulus is a critical parameter in evaluating well integrity. This state of stress controls opening of permeable micro-annuli between the cement, formation rock, and/or casing as a result of the varying conditions of the well...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1793
... increasing drawdown on producers. Aside from including cement and casing as structural elements, the modelling incorporated a subsurface u stress model, geological horizons from a full-field geomodel, and pore pressure profiles from a reservoir simulator. The goal was to define specific failure onset time...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1864
... cement formulation Upstream Oil & Gas formation temperature cement-casing sample cement property casing and cementing shear bond strength co 2 downhole mechnical-chemical condition MPa cement chemistry strength normal stress cement plug flow in porous media high temperature...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-554
... ABSTRACT: Multi-scale numerical geomechanical models for reservoir and overburden deformation in the Tyra chalk field (Denmark) were made, and calibrated by laboratory deformation tests and field data. The mechanical interaction between the compacting and deforming formation, cement and...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-035
... ABSTRACT: Cement sheath integrity supports the long-term safety production of oil and gas well. In order to research failure mechanism of cement sheath in HPHT conditions, uniaxial and triaxial compressive tests and cyclic loading test of cement are conducted, and mechanical property and...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-224
... ABSTRACT: The integrity of the cement sheath is the key part to maintain zonal isolation and prevent the inter-zonal communication. Loads arising from multiple stages of wellbore life span may induce various modes of cement failure within the cement (disking and radial cracks) and at the...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-306
... ABSTRACT: Due to scarcity of the natural reservoir core material, artificial sandstones are prepared instead. In this study, sodium silicate solution was used as the cementing agent for a quartz sand material. The cylindrical molded soft sand-cement mixtures were placed in the specially...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-238
... ABSTRACT: Micro-annuli existing on the interface of cement-sheath might lead to the failure of wellbore integrity. Based on the solutions of the elastic and elastic-plastic deformations of a thick-walled cylinder with the internal and external pressures; meanwhile combining with the...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-647
... a parametric investigation on the effects of cavity properties, lithology, and cement characteristics, casing behavior is assessed. Numerical analyses using the finite element method generate a database of this study. Salt rocks are modeled as elasto-viscoplastic materials, with creep simulated by...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1164
... ABSTRACT: Recent studies found that the behavior of the hardened cement can be described within poroelasticity. However, previous studies about casing-cement-stratum system assumed the cement as an elastic body. Thus the objective of this paper is to investigate the porothermoelastic response...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1298
... ABSTRACT ABSTRACT: Loading history during drilling, completion and operations of the well can affect wellbore integrity. Debonding along well cement interfaces leads to the creation of micro-annuli and potential leakage pathways. We investigate the risk of debonding by modeling the integrity...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1242
... ABSTRACT: A faulty cement sheath in a wellbore can result in gas migration from the formation to surface, which can leak and emit into the atmosphere. In attempt to combat this issue, we set out to investigate a natural cement additive, Gilsonite. The origin of Gilsonite is crystalized...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0164
... production phases, the analytical solution considers the main steps of the wellbore lifespan: initial stress state in the formation, drilling operation, casing construction, initial stress state in the cement, pressure changes inside the casing and pore pressure variation. For both approaches, plane strain...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0328
... ABSTRACT: The external and internal alterations may affect the wellbore cement stability throughout the setting period. These alterations generate micro/macro fractures in the cement matrix. Such situation, known as Sustained Casing Pressure (SCP), may result in creating pathways for any...

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