Maximizing the Production of Condensates from Gas/Condensate Reservoirs by Injecting Dry Gases
Mohamed Abd El-Moneim Mohamed El Aily;
Abstract
Gas condensate production and reserves continue to rise. Over the last thirteen years, reserves of natural gas have rapidly increased from 0.646 Trillion cubic feet (Tcf) by the end of 2000 to 67 Tcf in 2011. In addition to 40 – 60 Tcf probable gas reserves existed. Natural gas production is estimated by 2.2 Tcf/Year, and production of condensates doubled to 150,000 barrels per day, partially offsetting the decline in daily crude oil production (Production= 650,000 bbL/day).
Regarding the total energy consumption, almost all of Egypt's 3.4 quadrillion British thermal units (Btu) of energy consumption in 2009 was met by oil (47 percent) and natural gas (48 percent). Oil's share of the energy consumption mix is mostly in the transportation sector, but with the development of compressed natural gas (CNG) infrastructure and vehicles, the share of natural gas in the transportation sector is likely to continue to grow.
The government has been pushing to reduce domestic petroleum consumption by attempting to reduce subsidies and promote the use of natural gas. However, subsidy reduction is a politically sensitive issue that has proven difficult to fully implement. For the 2011/2012 fiscal year, the subsidy was budgeted at 96 billion Egyptian pounds, according to Global Insight. The increased use of compressed natural gas as a fuel for motor vehicles and the conversion of some thermal power plant feedstock to gas have, to an extent, helped to ease the consumption of petroleum products.
Dry natural gas consumption nearly doubled over the last decade and reached 1.6 Trillion cubic feet (Tcf) in 2010. Total petroleum consumption has risen by about one-third over the same time period. Annual Reports of Ministry of Petroleum (ARMP) show that petroleum consumption in 2011 was about 815,000 bbl/d. The rapid growth of oil and gas consumption has been driven by increased industrial output, economic growth, energy-intensive gas and oil extraction projects, population growth, and fast-rising private and commercial vehicle sales.
Increasing oil demand need for more research work regarding enhanced black oil recovery and/or enhanced condensate recovery. The later concerns the delay of dew point occurring by injecting dry gas into reservoir at initial conditions. Generally production from gas/condensate reservoir is accompanying by declining the reservoir pressure. In rich gas condensate reservoirs, the hydrocarbons production is exhibiting an in-situ condensation of the heavier components once the reservoir pressure decline to the dew point pressure. In allowing such condensation to occur, considerable amount of valuable condensate is left in the reservoir.
Depletion of gas condensate reservoirs initiates a decline in reservoir pressure below the dew point pressure of the retrograde gas. This leaves valuable amount of condensate in the reservoirs which is not only lost but results in a condensate blockage near the wellbore region and leads to a decrease in the productivity. Thus, it is of very essential economical purposes to find applicable ways to increase the recovery of this lost condensate from the reservoirs. In this study, dry gas is injected into reservoir at initial conditions led to a delay in dew point pressure that in return enhanced the condensate recovery. This is relying on the fact that the production from gas condensate reservoirs is accompanied by declining in the reservoir pressure. The injection schemes that have been considered are: different injection rates and different reservoir conditions.
Regarding the total energy consumption, almost all of Egypt's 3.4 quadrillion British thermal units (Btu) of energy consumption in 2009 was met by oil (47 percent) and natural gas (48 percent). Oil's share of the energy consumption mix is mostly in the transportation sector, but with the development of compressed natural gas (CNG) infrastructure and vehicles, the share of natural gas in the transportation sector is likely to continue to grow.
The government has been pushing to reduce domestic petroleum consumption by attempting to reduce subsidies and promote the use of natural gas. However, subsidy reduction is a politically sensitive issue that has proven difficult to fully implement. For the 2011/2012 fiscal year, the subsidy was budgeted at 96 billion Egyptian pounds, according to Global Insight. The increased use of compressed natural gas as a fuel for motor vehicles and the conversion of some thermal power plant feedstock to gas have, to an extent, helped to ease the consumption of petroleum products.
Dry natural gas consumption nearly doubled over the last decade and reached 1.6 Trillion cubic feet (Tcf) in 2010. Total petroleum consumption has risen by about one-third over the same time period. Annual Reports of Ministry of Petroleum (ARMP) show that petroleum consumption in 2011 was about 815,000 bbl/d. The rapid growth of oil and gas consumption has been driven by increased industrial output, economic growth, energy-intensive gas and oil extraction projects, population growth, and fast-rising private and commercial vehicle sales.
Increasing oil demand need for more research work regarding enhanced black oil recovery and/or enhanced condensate recovery. The later concerns the delay of dew point occurring by injecting dry gas into reservoir at initial conditions. Generally production from gas/condensate reservoir is accompanying by declining the reservoir pressure. In rich gas condensate reservoirs, the hydrocarbons production is exhibiting an in-situ condensation of the heavier components once the reservoir pressure decline to the dew point pressure. In allowing such condensation to occur, considerable amount of valuable condensate is left in the reservoir.
Depletion of gas condensate reservoirs initiates a decline in reservoir pressure below the dew point pressure of the retrograde gas. This leaves valuable amount of condensate in the reservoirs which is not only lost but results in a condensate blockage near the wellbore region and leads to a decrease in the productivity. Thus, it is of very essential economical purposes to find applicable ways to increase the recovery of this lost condensate from the reservoirs. In this study, dry gas is injected into reservoir at initial conditions led to a delay in dew point pressure that in return enhanced the condensate recovery. This is relying on the fact that the production from gas condensate reservoirs is accompanied by declining in the reservoir pressure. The injection schemes that have been considered are: different injection rates and different reservoir conditions.
Other data
| Title | Maximizing the Production of Condensates from Gas/Condensate Reservoirs by Injecting Dry Gases | Other Titles | تعظيم انتاج المتكثفات من حقول الغاز عن طريق الحقن بالغازات الجافة | Authors | Mohamed Abd El-Moneim Mohamed El Aily | Issue Date | 2015 |
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