Purposes During the extraction of seabed energy soil, a common issue is the reduction in cementation strength around the wellbore, which triggers shear deformations at the interface between the seabed energy soil and the extraction well, consequently impacting the well’s stability. Methods In order to study the geomechanical properties of reservoir soil-structure, research was conducted by using a GDS interface shear device on remolded soil samples from the Shenhu area’s seabed energy soil reservoir in the South China Sea. The interface shear mechanical properties with various moisture contents and shear rates were examined, and the shear mechanical behavior of the reservoir soil-structure interface with different conditions was investigated. Results The findings reveal that the interface shear stress-strain demonstrates distinct elastoplastic characteristics, which can be represented by a logarithmic curve model. Shear induces volumetric changes in the soil, higher moisture contents and lower shear rates lead to more pronounced interface shear compaction deformation. The shear strength of the reservoir soil-structure interface increases with both normal stress and shear rate but decreases with an increase in moisture content. These findings provide a basis for the stability analysis of seabed energy soil reservoirs.
RutqvistJ, MoridisG, GroverT,et al.Geomechanical response of permafrost-associated hydrate deposits to depressurization-induced gas production[J].Journal of Petroleum Science and Engineering,2009,67(1/2):1-12.
[5]
XinS J, LingZ, LongN F,et al.Production potential and stability of hydrate-bearing sediments at the site GMGS3-W19 in the South China Sea:A preliminary feasibility study[J].Marine and Petroleum Geology,2017,86:447-473.
[6]
ReemF A, CheeT, BenC,et al.A wellbore stability model for hydrate bearing sediments[J].Journal of Petroleum Science and Engineering,2007,57(1/2):209-220.
NardelliA, CacciariP P, FutaiM M.Sand-concrete interface response:The role of surface texture and confinement conditions[J].Soils and Foundations,2019,59(6):1675-1694.
[15]
KouH L, DiaoW Z, ZhangW C,et al.Experimental study of interface shearing between calcareous sand and steel plate considering surface roughness and particle size[J].Applied Ocean Research,2021,107:102490.
[16]
WangH L, ZhouW H, YinZ Y,et al.Effect of grain size distribution of sandy soil on shearing behaviors at soil-structure interface[J].Journal of Materials in Civil Engineering,2019,31(10):04019238.
VafaeiN, FakharianK, SadrekarimiA.Sand-sand and sand-steel interface grain-scale behavior under shearing[J].Transportation Geotechnics,2021,30:100636.
[20]
ZhouW J, GuoZ, WangL Z,et al.Sand-steel interface behaviour under large-displacement and cyclic shear[J].Soil Dynamics and Earthquake Engineering,2020,138:106352.
[21]
LiuZ C, DaiS, NingF L,et al.Strength estimation for hydrate‐bearing sediments from direct shear tests of hydrate‐bearing sand and silt[J].Geophysical Research Letters,2018,45(2):715-723.
[22]
LiuZ C, WeiH Z, PengL,et al.An easy and efficient way to evaluate mechanical properties of gas hydrate-bearing sediments:The direct shear test[J].Journal of Petroleum Science and Engineering,2017,149:56-64.
[23]
LiY L, LiuC L, LiuL L,et al.Experimental study on evolution behaviors of triaxial-shearing parameters for hydrate-bearing intermediate fine sediment[J].Advances in Geo-Energy Research,2018,2(1):43-52.
[24]
YuanQ M, KongL, LiangQ Y,et al.Mechanical characteristics of gas hydrate-bearing sediments:An experimental study from the South China Sea[J].Journal of Marine Science and Engineering,2024,12(2):301.
[25]
LuX B, ZhangX H, SunF F,et al.Experimental study on the shear band of methane hydrate-bearing sediment[J].Journal of Marine Science and Engineering,2021,9(11):1158.
LiY H, HaoY, WuP,et al.Mechanical behavior of hydrate-bearing clayey-silty sediments in the south china sea:Strain-rate dependency[J].Energy & Fuels,2024,38(7):5959-5973.
[36]
WuQ, YoshimotoN, NakanoN,et al.Shear Rate-dependent behaviors on natural gas hydrate-bearing sediments under plane strain shear test[C]//Proceedings of the ISOPE International Ocean and Polar Engineering Conference,ISOPE,2020.
ChenB, SunD A, HuY S.Experimental study on strength characteristics and microscopic mechanism of marine soft clays[J].Marine Georesources & Geotechnology,2020,38(5):570-582.
[39]
NianT K, JiaoH B, FanN,et al.Microstructure analysis on the dynamic behavior of marine clay in the South China Sea[J].Marine Georesources & Geotechnology,2020,38(3):349-362.