Analysis of Throttling Dehydration for Natural Gas Recovery in Underground Gas Storage

With the increasing energy demands of current modern society, underground gas storage (UGS) in gas fields is the most popular type of UGS used to meet the seasonal variation of gas consumption. However, compared with gas fields, UGS in gas fields has the characteristics of periodic high-speed injection and production of exploitation modes and operation rules, which causes the rules of gas-water seepage and utilization of reserves to be more particular and complicated. In this paper, based on Wen 23 gas storage, the rules of multicycle injection and production flow and the utilization of UGS pore volume were investigated. The experimental results showed that variation in porosity and permeability caused by injection and production pressure changes in Wen 23 gas storage can be neglected. The pore volume of gas storage and the degree of gas recovery increased gradually in the pre-UGS gas zone, which was higher than that of reservoirs. In the initial stage of UGS operation, the pore volume of gas storage and the degree of gas recovery were low in the gas-drive-water gas zone as a result of water invasion during the process of reservoir exploitation. During operation of multicycle high-speed injection and production, the seepage conditions in the gas-drive-water gas zone gradually improved. The higher the reservoir permeability, the greater increases in pore volume and degree of gas recovery. In the gas-water transition zone, gas and water were reciprocated and displaced with the multicycle injection-production of UGS, resulting in the gradual deterioration of pore volume and gas recovery, which remained stable at a low value. The negative effects of reservoir heterogeneity on the effective utilization of UGS occurred in the gas-water transition zone. These findings may contribute to a better understanding of the rules of multicycle injection and production flow and utilization of UGS to optimize the injection-production efficiency of Wen 23 gas storage.

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97/01076 Hydrogen production from natural gas, sequestration of recovered CO2 in depleted gas wells and enhanced natural gas recovery

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(97)82865-2 ◽

1997 ◽

Vol 38 (2) ◽

pp. 88-89

Keyword(s):

Hydrogen Production ◽

Natural Gas ◽

Gas Wells ◽

Gas Recovery ◽

Natural Gas Recovery

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A review of research on the dispersion process and CO2 enhanced natural gas recovery in depleted gas reservoir

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2021.109682 ◽

2021 ◽

pp. 109682

Author(s):

Shezhan Liu ◽

Lei Yuan ◽

Changzhong Zhao ◽

Yi Zhang ◽

Yongchen Song

Keyword(s):

Natural Gas ◽

Gas Reservoir ◽

Dispersion Process ◽

Gas Recovery ◽

Depleted Gas Reservoir ◽

Natural Gas Recovery

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The Commercial Potentials of Underground Natural Gas Storage in Nigeria

10.2118/207149-ms ◽

2021 ◽

Author(s):

Adedamola Adegun ◽

Femi Rufai

Keyword(s):

Natural Gas ◽

Power Plants ◽

Thermal Power ◽

Gas Storage ◽

Industrial Clusters ◽

Domestic Market ◽

Underground Gas Storage ◽

Natural Gas Storage ◽

Hydro Power ◽

Energy Mix

Abstract Nigeria is the 2nd biggest natural gas producer in Africa, with much of it exported as LNG, some re-injected while a small fraction serves the domestic market. The volume supplied to the domestic market plays an outsized role in the energy mix and economy of Nigeria with over 90% supplied to thermal power plants and industrial clusters. As huge upstream gas projects continue to take Final Investment Decision, pipeline takeaway capacity grows and demand increases, the dependence on natural gas and preponderance in the energy mix will likely persist. Natural gas is the present and future of Nigeria's energy needs. The domestic gas industry is evolving but has been fraught with challenges. Oil and gas infrastructure are often disrupted and production shut-in, mostly triggered by infrastructure unavailablity, environmental concerns and prioritisation of hydro power generation during River Niger's white and black floods, all of which come at a cost to upstream producers. Gas producers are often compelled to curtail production of gas plants (associated and non-associated) to avoid environmental disasters and prohibitive gas flare penalties. Can underground gas storage (UGS) be an opportunity for gas producers to guarantee continued operations during disruptions and provide buffer for national strategic benefits? This paper seeks to explore the potential technical and economic dynamics of underground natural gas storage in Nigeria in the context of extant technical regulations, seasonal demand variations, gas flare penalties and local operating environment. The paper presents types of underground storages and recommends the most suitable, considers options for optimal location of UGS in Nigeria and undertakes an economic evaluation of a UGS project. The findings are further presented alongside the critical technical, regulatory and fiscal factors that may facilitate future investments and growth of underground gas storage in Nigeria.

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