Effects of vertical center well and side well on hydrate exploitation by depressurization and combination method with wellbore heating
| Autor: | Qing-Cui Wan, Wenting Zhao, Shu Liu, Bo Li, Yunpei Liang, Gang Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Bell curve
Petroleum engineering 020209 energy Energy Engineering and Power Technology 02 engineering and technology Geotechnical Engineering and Engineering Geology Wellbore stomatognathic diseases Fuel Technology Electricity generation 020401 chemical engineering Cabin pressurization 0202 electrical engineering electronic engineering information engineering Shape relationship 0204 chemical engineering Hydrate decomposition Combination method Hydrate Geology |
| Zdroj: | Journal of Natural Gas Science and Engineering. 55:154-164 |
| ISSN: | 1875-5100 |
| DOI: | 10.1016/j.jngse.2018.04.030 |
| Popis: | The effects of depressurization and the combination method with wellbore heating on vertical center well and vertical side well on hydrate exploitation were investigated and compared in this study. Six combinations of experimental groups were conducted using different exploitation methods (i.e., depressurization and the combination method) and different types of wells (i.e., vertical center well and vertical double-side wells). The results show that the lower the production pressure is, the better it can generate hydrate productions. Meanwhile, it is further confirmed that the heating process can greatly increase the gas production rate of hydrates. In addition, when using depressurization within a certain exploitation range, the location of the production well has little impact on the effects of hydrate exploitation. However, with double-side wells using the combination method, the effect of driving force in hydrate decomposition is weakened due to the larger heat loss. Therefore, when the heating well is located close to the boundary of the hydrate deposit, the use of double-side wells is less productive than that of a center well. As a result, when using the depressurization method, the location of the production well within the exploitation zone should be as close to the coastal line as possible with a stable hydrate deposit layer. On the other hand, when wellbore heating is applied, it is suggested that the heating well should be arranged near the center of the hydrate deposit. Furthermore, it is found that there is a right-skewed bell curve shape relationship between the exploitation time and the energy generation level using the combination method. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect