1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China 2. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
A new temperature-pressure state parameter was defined in order to reflect the influence of temperature-pressure environment on the mechanical properties of hydrate-bearing sediments. Based on the mechanism of temperature-pressure environment on the mesoscopic structure of the sediments, a multi-scale elastic parameter prediction model was proposed by using the three-phase sphere model considering the influence of temperature-pressure environment on the mesoscopic components and the contact interface of each component. Then, based on the traditional Duncan-Chang model and the statistical damage theory, a Duncan-Chang statistical damage model was established by introducing the ultimate damage value. The validity and reasonability of the proposed model were verified by comparing the triaxial tests data of hydrate-bearing sediments under different temperature and pore pressure conditions with the predicted results of the model. Results show that the model can take into account the effects of hydrate saturation, temperature and pore pressure environment, grain size grading of sediments skeleton. It can well simulate the stress-strain characteristics of hydrate-bearing sediments under different temperature and pore pressure environments.
Fig.1Schematic diagram of mesoscopic contact of hydrate-bearing sediments
Fig.2Methane hydrate phase equilibrium curve
Fig.3Schematic diagram of the homogenization process of hydrate-bearing sediments
Fig.4Relationship between volume modulus of liquid water in pores and temperature and pore pressure
Fig.5Toyoura sand particle size distribution curve
Fig.6Relationship between elastic modulus of methane hydrate and state parameters of temperature and pore pressure
ξ
SMH/%
φMH/%
F0
m
0.971 0
0
0
18.183 0
1.949 1
0.971 0
26.6
11.69
21.359 4
3.731 3
0.971 0
46.6
18.85
28.047 9
5.422 5
Tab.1Model parameters with different hydrate saturation
σ3/MPa
SMH/%
φMH/%
F0
m
1
34.8
0.147 6
10.894 4
4.574 4
2
34.8
0.147 6
16.695 5
3.809 9
3
34.8
0.147 6
22.361 9
2.908 9
Tab.2Model parameters under different confining pressure
ξ
SMH/%
φMH/%
F0
m
0.957 0
23.2
10.35
27.297 1
4.393 3
0.965 6
23.2
10.35
22.533 3
4.091 9
0.971 0
24.7
10.95
18.896 6
3.726 8
0.971 0
46.6
18.85
29.168 8
4.591 3
0.991 3
42.5
17.45
23.110 3
3.427 5
Tab.3Model parameters under different P-T condition
Fig.7Comparison between experimental results and calculated results of stress-strain curves of hydrate-bearing sediments at different conditions
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