Experimental simulation of depressurization mining of the class 1 hydrate reservoir

被引：0

作者：

Huang T. ^{[1
,2
]}

Li Q. ^{[1
,2
]}

Li R. ^{[3
]}

Pang W. ^{[1
,2
]}

Chen G. ^{[3
]}

机构：

[1] State Key Laboratory of Natural Gas Hydrate, Beijing

[2] Gas Hydrate and Marine Resources Strategic Research Center, CNOOC Research Institute Company Limited, Beijing

[3] College of Chemical Engineering and Environment, China University of Petroleum (Beijing), Beijing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 08期

关键词：

class 1 hydrate reservoir; depressurization mining; gas recovery rate; mining pressure; underlying gas;

D O I：

10.16085/j.issn.1000-6613.2021-2124

中图分类号：

学科分类号：

摘要：

Hydrate reservoirs containing underlying free gas in the South Sea have the geological conditions to realize the “two-gas production” of underlying free gas and hydrate decomposition gas, which can increase the gas production of hydrate mining and improve economic efficiency. However, there are few indoor experimental simulation studies on this type of reservoir, and there is insufficient understanding of the mining law. In this paper, a three-dimensional hydrate simulation device was developed to establish a new method for the preparation of the first type of hydrate reservoir containing free gas layers, and to study the gas and water production characteristics of the hydrate reservoir during the depressurization production process. The results showed that the production pressure below the four-phase point of methane hydrate could effectively accelerate the hydrate decomposition process and improve the mining efficiency. When the production pressure was reduced from 2.95MPa to 2.14MPa, the gas recovery rate in the rapid gas production stage was increased by 10%, the total mining time was shortened by about 38%, and the total recovery rate was increased from 73% to 81%. When the production well hole was located in a hydrate layer, secondary hydrate formation may occur near the well hole, resulting in a significant reduction in the rate of gas production. Compared with the production well in a gas layer, with the same cumulative gas production rate, the production time was extended by about 30%. Comparing the first and third types of hydrate reservoirs, the rapid gas production phase of the first type hydrate reservoir lasted for more than 20min, which was more than twice as long as that of the third type hydrate reservoir, but the total gas recovery rate was slightly lower. The first type of gas-saturated hydrate reservoir was modeled here, and to simulate actual marine hydrate reservoir, it had certain limitations. Future research will need to focus on the scale of experimental equipment, regional temperature control methods, experimental media selection, and reservoir remodeling stability. So that we can solve the key technical problems of reservoir remodeling to provide basic data reference for the mining of argillaceous silt-type natural gas hydrate reservoirs with underlying free gas in our country. © 2022 Chemical Industry Press. All rights reserved.

引用

页码：4120 / 4128

页数：8

共 14 条

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