Experimental Investigation of Characteristics of Sand Production in Wellbore during Hydrate Exploitation by the Depressurization Method
Abstract
:1. Introduction
2. Experimental Apparatus and Process
2.1. Experimental Apparatus
2.2. Materials
2.3. Experimental Procedure
3. Results
3.1. Pressure Characteristic and Production Periods
3.2. Temperature Related Characteristics
3.3. Sand Production in Hydrate Production Tests
3.3.1. Sand Production in Hydrate Production Periods
3.3.2. Size of the Produced Sand and Sand Rates in the Production Water
4. Discussion
4.1. Driving Force and Mechanism of Sand Production during Hydrate Exploitation
4.2. Subsidence of Hydrate-Bearing Sediments with Sand Production
5. Conclusions
- (1)
- Three hydrate production periods were observed; water production by depressurization, gas production with water drops, and low gas production.
- (2)
- The sand production phenomena were different during different hydrate production period. Production of whole fine sand and sand grains was noted in the first and second periods, respectively, and no significant amount of sand was produced in the third period.
- (3)
- Sputtering unique to hydrate decomposition may provide the driving force for sand migration. The flowing gas bubbles and water from hydrate decomposition enhanced the sand carrying capacity and reduced the strength of hydrate-sand cementation and skeleton solids.
- (4)
- From the experiments, the subsidence of hydrate-bearing-sediments could be over 10% with sand production. Thus, higher sand production led to the higher subsidence. The loss of crustal pressure may increase the subsidence. The dynamic subsidence of the hydrate layers and sand production alter the seepage characteristics, thermal properties and material balance of the hydrate layers. The temperature related characteristics are affected by hydrate production periods. The final subsidence of the hydrate-bearing sediment when crustal stress was not maintained was very high at over 10 mm (10%). When there was no wellbore collapse or sudden collapse of the sediment, the subsidence was no more than 5 mm (5%).
Author Contributions
Funding
Conflicts of Interest
References
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Materials | Properties | Supplier |
---|---|---|
Sand | d (0.5) = 225.67 μm, uniformity 0.40, specific surface area 0.18 m2/g, density 1.63 g/mL, porosity 28.52%, | GMGS |
Deionized water | Resistivity: 18.2 mΩ/cm | Laboratory |
Methane | Purity: 99.99% (mole fraction) | Shiyuan Gas Co. |
No. | Initial Water Rates (%) | Ideal Hydrate Saturation in Pore (%) | Gas Production (L) | Water Production with Sand (g) | Hydrate Saturation (%) | Sand Production (g) | Total sand Production Rate (%) | Final Subsidence (%) |
---|---|---|---|---|---|---|---|---|
1 | 3.01 | 12 | 40.31 | 450.00 | 38.86 | 3.63 | 0.81 | −14.82 |
2 | 20.00 | 80 | 153.35 | 563.37 | 100.00 | 17.28 | 3.06 | −9.91 |
3 | 25.00 | 100 | 81.69 | 873.11 | 73.83 | 27.65 | 3.16 | −4.26 |
4 | 10.00 | 40 | 58.75 | 467.33 | 53.10 | 1.69 | 0.36 | −2.73 |
5 | 12.50 | 50 | 52.42 | 640.87 | 47.38 | 1.14 | 0.18 | −1.93 |
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Lu, J.; Xiong, Y.; Li, D.; Shen, X.; Wu, Q.; Liang, D. Experimental Investigation of Characteristics of Sand Production in Wellbore during Hydrate Exploitation by the Depressurization Method. Energies 2018, 11, 1673. https://doi.org/10.3390/en11071673
Lu J, Xiong Y, Li D, Shen X, Wu Q, Liang D. Experimental Investigation of Characteristics of Sand Production in Wellbore during Hydrate Exploitation by the Depressurization Method. Energies. 2018; 11(7):1673. https://doi.org/10.3390/en11071673
Chicago/Turabian StyleLu, Jingsheng, Youming Xiong, Dongliang Li, Xiaodong Shen, Qi Wu, and Deqing Liang. 2018. "Experimental Investigation of Characteristics of Sand Production in Wellbore during Hydrate Exploitation by the Depressurization Method" Energies 11, no. 7: 1673. https://doi.org/10.3390/en11071673