An easy and efficient way to evaluate mechanical properties of gas hydrate-bearing sediments: The direct shear test

Highlights

• A direct shear apparatus was developed for gas hydrate-bearing sediments.

• Shear strength was measured under various testing conditions.

• The shear strength, cohesion and internal friction angle were comparable with previous studies.

Abstract

Understanding the mechanical behaviours of gas hydrate-bearing sediments (GHBS) is important for their associated applications in wellbore stability, stratum deformation during exploitation, geological disaster prevention, and the risk assessment of replacing CH₄ with CO₂ in hydrate reservoirs and CO₂ sequestration in oceans. However, triaxial tests on mechanical properties of GHBS are taxing and time-consuming. Here, we presented an easy and efficient way to evaluate these behaviours by using a self-developed direct shear apparatus. Then a series of direct shear tests on GHBS represented by CO₂ hydrate-bearing silt were performed to investigate their mechanical behaviours and strength indices by changing the axial pressure, CO₂ hydrate saturation, shear rate and hydrate synthesis temperature. Our results indicate that CO₂ hydrate significantly strengthens specimens by cementing silt grains. In addition, when hydrate saturation increases, the cohesions are enhanced from 0.09 to 2.39 MPa, and the internal friction angles increase and decrease at the range from 28.6° to 43.3° under the experimental conditions. These findings have direct implications for evaluating the stability and safety of natural gas hydrate reservoirs, CO₂ replacement to extract CH₄ and CO₂ sequestration.