Using 3D Integrated Modelling to Manage the Fractured Natih Field (Oman)

Eikmans, H.; Hitchings, Victor H.

doi:10.2118/53227-ms

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…4,5) confirmed that full GOGD with oil rim lowering was the most attractive way for the continued development of the Natih Field. It was, thereafter, implemented in the Natih-A, together with crestal gas injection and peripheral water production.…”

Section: Water and Gas Injection (1972-82) -mentioning

confidence: 79%

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A Switch from Verticals to Dual Lateral Producers Accelerate Oil Production and Reduces UTC for Natih Field

Salhi¹,

Maimani²,

Makel³

2001

SPE Middle East Oil Show

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Natih field in Oman is a densely fractured carbonate reservoir with a STOIIP of 460 million m3. The displacement processes active in the Natih reservoir during the production period are very complex. Production started in 1967 with depletion of the reservoir resulting in production of oil from the fracture system and oil displacement by fluid expansion and solution gas drive. After these processes had ceased, gas oil gravity drainage in the secondary gas cap, water oil imbibition and water oil gravity drainage by aquifer below the secondary oil water contact continued to displace the oil from the matrix.

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Section: Water and Gas Injection (1972-82) -mentioning

confidence: 79%

“…The initial production behavior of the Natih filed (Figs. [3][4][5] showed well off-take up to 2000 m3/d and total field production building up to more than 15000 m3/d. Early developing water cut and fast movement of fluid contacts were totally in line with a fractured reservoir.…”

Section: Field Development Historymentioning

confidence: 97%

A Switch from Verticals to Dual Lateral Producers Accelerate Oil Production and Reduces UTC for Natih Field

Salhi¹,

Maimani²,

Makel³

2001

SPE Middle East Oil Show

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“…It is believed that gas injection may postpone upward migration of WOC through the fractures known as coning/fingering (Zaitoun et al, 1999). It is stated that among all oil recovery mechanisms, the highest recovery efficiency belongs to gas-oil gravity drainage (GOGD), however, the recovery rates during isothermal GOGD are reported to be considerably low (Eikmans and Hitchings, 1999). Therefore, for economical oil recovery through the GOGD mechanism, it requires to be assisted by other compatible mechanisms to defeat the low oil drainage rate Macaulay et al, 1995;Hamed et al, 2001;Ayatollahi et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Secondary and Tertiary Thermally Induced Gas-oil Gravity Drainage from Oil-wet Fractured Rocks: Experiments under Reservoir Conditions

Asadizadeh

Mohsenzadeh

Escrochi

et al. 2014

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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A series of reservoir condition experimental studies are presented that investigate the effects of oil production by water drive on the success of subsequent oil production by gas-oil gravity drainage in a fractured laboratory model. The experiments were performed using low permeable, oil-wet carbonate core samples. During this work, injection of N 2 gas followed by steam into the fracture was studied using two different scenarios: initial oil place at connate water saturation condition utilized for secondary oil recovery, and water flooded cores at residual oil saturation for tertiary oil recovery. The result showed that the water invasion into the fractures reduces oil production potential, and it is shown that the ultimate recovery for secondary gas injection is considerably higher than tertiary gas-oil gravity drainage for both isothermal and non-isothermal tests. Steam injection into the fractured model leads to twice more oil recovery than the preceding isothermal recovery. The results confirmed that the key oil production mechanism during non-isothermal gas-oil gravity drainage that initiates the main phase of oil production is heat transfer into the matrix blocks and viscosity reduction. In addition, results of contact angle measurements showed that wettability of the oil wet rocks after steam flooding was shifted to neutral wet condition that increase gravity drainage performance.

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“…Frequently, the matrix of such reservoirs contains the oil, while the fractures provide the flow paths. In such reservoirs, oil production can be improved by making use of gas/oil gravity drainage [see O'Neill (1988), Novinpour et al (1994), Saidi (1996), and Eikmans and Hitchings (1999)]. …”

Section: Field Casementioning

confidence: 99%

The Role of Diffusion for Nonequilibrium Gas Injection Into a Fractured Reservoir

Yanze

Clemens

2012

SPE Reservoir Evaluation &Amp; Engineering

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The Schönkirchen Tief oil field is located in the Vienna basin in Austria. It is a pervasively fractured dolomite reservoir that has been produced for more than 50 years. The field is at the tail end of production, the wells are perforated close to the top of the reservoir, and water is injected downdip. Because of the location of the field close to one of the main gas pipelines in Austria, it is planned to convert the field into high-performance underground gas storage (UGS).The field is characterized by a highly permeable fracture system and a less-permeable matrix system. It is expected that some incremental oil can be recovered because of gas/oil gravity drainage from the matrix.In addition to gas/oil gravity drainage, diffusion will have an effect on the oil recovery. The injected gas is leaner than the equilibrium gas in the reservoir. Hence, gas components diffuse from the fracture system into the matrix and components of the oil diffuse toward the fracture system. This results in a modification of the properties of the oil affected by diffusion.This type of gas injection results in a zone of decreased oil viscosity for gases such as CO 2 and CH 4 at the interface of the gas and the oil in the matrix. This zone of lower oil viscosity increases the gas/oil gravity-drainage rates.The results show that the effect of diffusion can increase cumulative oil production up to 25% compared with a case neglecting the effect of diffusion. The effect of diffusion could be determined for various parameters such as permeability, porosity, fracture spacing, and matrix-block height. While for some of the parameters the effect of diffusion scales with the square root of time (e.g., permeability), for others an exponential relationship has been determined (fracture spacing).The results derived for the example reservoir can be used more generally to screen whether the effect of diffusion should be incorporated into reservoir studies concerning nonequilibrium-gas injection and to determine how large the error could be in the case where diffusion is neglected. Reservoir ProcessesOil recovery from pervasively fractured reservoirs is challenging because of the often large contrast in permeability of the fractures

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Using 3D Integrated Modelling to Manage the Fractured Natih Field (Oman)

Abstract: This paper was prepared for presentation at the 1999 SPE Middle East Oil Show held in Bahrain, 20-23 February 1999.

Cited by 13 publications

References 17 publications

A Switch from Verticals to Dual Lateral Producers Accelerate Oil Production and Reduces UTC for Natih Field

A Switch from Verticals to Dual Lateral Producers Accelerate Oil Production and Reduces UTC for Natih Field

Secondary and Tertiary Thermally Induced Gas-oil Gravity Drainage from Oil-wet Fractured Rocks: Experiments under Reservoir Conditions

The Role of Diffusion for Nonequilibrium Gas Injection Into a Fractured Reservoir

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