Performance of Trinidad Gas Reservoirs (Cassia, Immortelle, Flamboyant, 
Mahogany, Amherstia and Teak)

Hallam, Richard; Kin, Maria

doi:10.2523/81010-ms

Cited by 3 publications

(2 citation statements)

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“…The improved performance of a gas reservoir with a weak aquifer above that of a volumetric reservoir has been observed in gas fields in Trinidad (Ali-Nandalal and Gunter, 2003;Hallam and Lum Kin, 2003). These phenomena occur because in the case of the weak water drive, the aquifer support slows down the rate of pressure decline sufficiently so that more reserves are produced before the abandonment pressure is reached, but before the onset of significant water production.…”

Section: Methodsmentioning

confidence: 88%

“…Available data indicate that the reservoirs located in the Columbus Basin exhibit both water drive and volumetric depletion (Hallam et al, 2003;Jemmott et al, 2008). The situation becomes more complicated when as occurs offshore Trinidad, several reservoirs are produced to sharedproduction facilities and water production is back allocated to fields.…”

Section: Introductionmentioning

confidence: 99%

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The Two-Rate Limit Test as a Tool for Determining Gas-in-place in Edge Water Drive Gas Reservoirs

Hosein¹,

Silva

Dawe

2013

Petroleum Science and Technology

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Gas reservoirs off the southeast coast of Trinidad have wells that are prolific producers, with rates in excess of 100 million standard cubic feet per day. The determination of the gas in place is an essential parameter required before gas can be contracted. Unfortunately, these reservoirs exhibit water drive, which create estimation uncertainties, and several reservoirs are produced to shared-production facilities and water production is back allocated to fields. The drive mechanism must be identified to prevent poor estimation, particularly overestimation, of reserves. The authors use numerical simulation to evaluate the benefit of a two-rate limit test for evaluating gas in place at various times during the life of the local edge water drive gas reservoir. The results indicate that the two-rate limit test is useful and determinations using the flow test ensures that this surveillance data can be collected while still meeting stringent contracted gas delivery requirements.

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Section: Methodsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The Two-Rate Limit Test as a Tool for Determining Gas-in-place in Edge Water Drive Gas Reservoirs

Hosein¹,

Silva

Dawe

2013

Petroleum Science and Technology

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One Tcf From One Well: The Design of a 500 MMscf/D Subsea Well for Offshore Mega Gas Fields

Reeves

Healy

2014

SPE International Symposium and Exhibition on Formation Damage Control

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With the continued discovery of large gas fields worldwide that have highly prolific sandstone reservoirs, the ability to design wells capable of recovering ultra-high volumes of gas will become of great interest. The project teams for these fields will be challenged to develop the fields with the smallest well count possible. The results from this study could prove useful to production and completion teams supporting large gas field developments. This paper presents a study to determine the feasibility of a subsea sand control gas well producing at rates up to 500 MMscf/D and recovering one trillion cubic feet (Tcf) of gas. Because the size of recent gas field discoveries is so large, reservoir simulation models will show that recoveries exceeding one Tcf are possible from a single location. Considering the huge cost to install deep water subsea sand controlled wells, reducing the total well count necessary to deplete the field is a business imperative. The results of the study show that completing a sand control well that can produce 500 MMscf/D and recover one Tcf is plausible. The details of the well productivity, completion design concepts and relevant comparison of analogue fields is shown. In conclusion, production and completion engineers involved in development of mega gas fields should at least consider planning for such wells.

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Condensate Performance Trends in Trinidad Gas Reservoirs

Jemmott

Hallam

Maharaj

2003

SPE Latin American and Caribbean Petroleum Engineering Conference

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TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractThe Cassia, Flamboyant, Immortelle, Mahogany, and Amherstia fields currently produce over 1.4 bcf/d for the Trinidad domestic gas market and Atlantic LNG Projects (Trains I and II). By early 2004 the gas rate should increase to about 2 bcf/d when two new projects start-up. These fields, plus the older Teak field are located in the Columbus Basin off the southeast coast of Trinidad.The six fields have produced gas from 35 reservoirs, which are at depths from 5084 ft tvdss to 13,000 ft tvdss, and with initial pressures from 2305 psi to 7420 psi. The fluid samples and production data show that the gases are condensates. The gas is a mixture of biogenic and thermogenic gas, and the initial condensate yields vary from 1 b/MMscf up to 50 b/MMscf. For most fields, it was found that the condensate yield increased with depth or reservoir pressure.The reservoirs exhibit a number of production mechanisms, including volumetric, volumetric with compartmentalization, and water-drive (weak to strong aquifers) (with or without compartmentalization). The paper reviews the condensate recovery factors, and produced yield trends for the different reservoirs and the different production mechanisms. It was also observed that for many of the waterdrive reservoirs that the condensate yield increased in late-life when water breakthrough occurred.An analytical approach was used to predict whether near wellbore condensate banking would occur in the Trinidad reservoirs. The model and field data both showed that near wellbore condensate banking was not a major issue in these reservoirs because of the high permeabilities and low drawdowns. However, banking could occur in some low permeability reservoirs or if a well was produced with a large drawdown.

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Performance of Trinidad Gas Reservoirs (Cassia, Immortelle, Flamboyant, Mahogany, Amherstia and Teak)

Cited by 3 publications

References 1 publication

The Two-Rate Limit Test as a Tool for Determining Gas-in-place in Edge Water Drive Gas Reservoirs

The Two-Rate Limit Test as a Tool for Determining Gas-in-place in Edge Water Drive Gas Reservoirs

One Tcf From One Well: The Design of a 500 MMscf/D Subsea Well for Offshore Mega Gas Fields

Condensate Performance Trends in Trinidad Gas Reservoirs

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