Impact of compression on the petro-physical and mechanic; Properties of wellbore cement containing salt

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Conference Proceeding

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Salt is usually added to oil well cement systems to overcome compatibility issues between well cements and salt containing formations as well as salt related durability issues with cement sheath. Several studies on the impact of adding salt to oil well cement have been documented in the literature; however, the impact of compression on salt cement sheath such as during hydraulic fracturing has not been fully investigated. This study focuses on investigating the impact of compression (cement's compaction) on the petrophysical and mechanical properties of wellbore cement containing salt and their potential impact on long term wellbore integrity issues. A unique bench-scale physical model, which utilizes expandable tubulars, was used to simulate the compaction of a previously cemented casing under field-like conditions. The impact of the compression on the cement's petrophysical and mechanical properties were quantified by measuring the porosity, permeability and hardness of 1 in × 2in cores drilled parallel to the orientation of the pipe from the compacted cement sheath. The acquired results indicate that the compaction of the cement sheath resulted in a reduction in porosity and permeability of the cement sheath and an increase in the hardness of the cement sheath after compaction. Furthermore, the results confirm reduction in the detrimental effect of salt on the strength and stiffness of the cement after compaction.

Publication Source (Journal or Book title)

49th US Rock Mechanics / Geomechanics Symposium 2015

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