Enhancement of Vorwata Field Reservoir Model by Integration of Pressure Transient Analysis with Real-Time Downhole Pressure Data

Setiawan, Agus; Hird, Kirk B.; Bennett, Curtis O.

doi:10.2118/147907-ms

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The pressure derivative curve is fluctuant. In fact, many well testing data are irregular (Carnegie et al 2009;Setiawan et al 2011;Wu et al 2007) possibly due to unidentifiable noise. Therefore, we smoothed the pressure derivative curve using a General least-squares smoothing technique (McDonald et al 2009;Nisbet et al 2009).…”

Section: Field Data Interpretationmentioning

confidence: 99%

Flow Modeling of Well Test Analysis for Porous–Vuggy Carbonate Reservoirs

et al. 2013

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Porous-vuggy carbonate reservoirs consist of both matrix and vug systems. This paper represents the first study of flow issues within a porous-vuggy carbonate reservoir that does not introduce a fracture system. The physical properties of matrix and vug systems are quite different in that vugs are dispersed throughout a reservoir. Assuming spherical vugs, symmetrically distributed pressure, centrifugal flow of fluids and considering media that is directly connected with wellbore as the matrix system, we established and solved a model of well testing and rate decline analysis for porous-vuggy carbonate reservoirs, which consists of a dual porosity flow behavior. Standard log-log type curves are drawn up by numerical simulation and the characteristics of type curves are analyzed thoroughly. Numerical simulations showed that concave type curves are dominated by interporosity flow factor, external boundary conditions, and are the typical response of porous-vuggy carbonate reservoirs. Field data interpretation from Tahe oilfield of China were successfully made and some useful reservoir parameters (e.g., permeability and interporosity flow factor) are obtained from well test interpretation.

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Section: Field Data Interpretationmentioning

confidence: 99%

Flow Modeling of Well Test Analysis for Porous–Vuggy Carbonate Reservoirs

et al. 2013

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“…Well-test measures the dynamic reservoir behavior in response to changing flow conditions at the well. The dynamic response of the well pressure to a change in rate is dependent on reservoir and well properties [13]. Hence, studying the dynamic pressure behavior in response to an appropriately designed sequence of well rate changes provides a way to evaluate some of these properties.…”

Section: Introductionmentioning

confidence: 99%

A Study on Optimization of CBM Water Drainage by Well-Test Deconvolution in the Early Development Stage

Gao

Liu

Guo³

et al. 2018

Water

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Different from the conventional gas reservoir, coalbed methane is developed mainly by water drainage, which leads methane desorption after reservoir pressure drop. Water drainage at a reasonable speed in the early development stage is the key for enhancing later gas performance. Therefore, the investigation radius, which reflects the pressure drop region scale, is studied by deconvolution well-test to find the reasonable water drainage speed in the early period. First, the early production data (well-bottom pressure and water rate) are processed by deconvolution algorithm, and then the pressure data under unit rate is obtained to invert the comprehensive reservoir permeability and investigation radius. This deconvolution method can save the cost of the conventional well-test, and avoid reservoir damage caused by frequent well shut-off. The feasibility of the deconvolution test method is verified by comparing its interpretation results with those of the conventional pressure drop/build-up test. For a field application, the 29 wells’ comprehensive permeability are inverted by the deconvolution well-test using early water production data of Hancheng block. Furthermore, their investigation radius and pressure drawdown gradient are calculated, and the performance optimization is determined by relationship analysis between working fluid level and steady gas production rate. We find that well-bottom pressure and reservoir pressure should decrease steadily in the early development stage, with the working fluid level declining less than 1 m/d (1 m per day) in wellbore, and the pressure drawdown gradient declining less than 2.8 MPa/100 m.

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Making Big Gas Producers Even Better: The Tangguh Experience

Apolianto¹,

Triandi²,

Turnbull

2011

SPE Asia Pacific Oil and Gas Conference and Exhibition

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Tangguh is a large gas producing development located in Bintuni Bay, in the Papua Barat province of Indonesia, some 3000 km east of Jakarta, the capital city of Indonesia. Gas production from the Vorwata Field and LNG export from the Tangguh LNG facility started in 2009. The field and the LNG facility are operated by BP. The Vorwata development consists of 14 wells drilled from two normally unmanned platforms. The wells were predrilled prior to completion of the LNG plant and are completed as 7" monobores. They are perforated conventionally and are limited to 240 MMscfd each due to erosional considerations. Production from the field is currently 1.3 Bscfd; this rate being limited by the throughput capacity of the Tangguh LNG plant. During the initial testing phase following completion and prior to start-up, the wells were limited by the infrastructure to a maximum rate of 100 MMscfd. Pressure transient analysis (PTA) of the data obtained during this test phase indicated that most of the wells had high mechanical skins. A reservoir preservation study showed that these high skins were caused by near wellbore damage and could theoretically be reduced by producing the wells at higher rates. Following start-up and establishment of stable plateau production, a rigorous well clean up and maximum rate testing program was carried out. The wells were flowed at rates up to 240 MMscfd and pressure build up (PBU) tests were subsequently carried out to evaluate any improvement in reservoir deliverability. The analysis of the post maximum rate test PBU data showed that the skins were reduced on average by 40% in each well.

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Enhancement of Vorwata Field Reservoir Model by Integration of Pressure Transient Analysis with Real-Time Downhole Pressure Data

Cited by 4 publications

References 19 publications

Flow Modeling of Well Test Analysis for Porous–Vuggy Carbonate Reservoirs

Flow Modeling of Well Test Analysis for Porous–Vuggy Carbonate Reservoirs

A Study on Optimization of CBM Water Drainage by Well-Test Deconvolution in the Early Development Stage

Making Big Gas Producers Even Better: The Tangguh Experience

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