Comparing Wireline Formation Tester Derived Productivity Index to Drill Stem Test

Guo, Sheng; Xu, Liqiang; Cai, Jianchao; Wu, Mu Wang; Yang, Hui; Hao, Zhongtian; Pan, Fuxi; Tan, Zhongjian; Khong, Chee Kin; Chen, Li; Ayán, Carlos

doi:10.2118/130868-ms

Cited by 2 publications

References 16 publications

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Revolutionising Formation Evaluation in Low Mobility Reservoirs of India

Ali

Ghosal

Singh

et al. 2020

Day 1 Mon, November 02, 2020

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Formation testing has been widely prevalent in the industry for critical information, such as reservoir pressure, gradient analysis, and fluid identification, that aids formation evaluation. This paper focuses on the successful evaluation of low-mobility reservoirs using the 3D radial probe as compared to the conventional probe in a comprehensive study of 60 wells (most of them offshore) across India. One of the major challenges in formation evaluation, fluid flow from any interval is not certain. Prospective zones are encountered that lie in unconsolidated sands where critical drawdown pressure cannot be exceeded because of formation integrity issues or there are zones that have low mobility and thus cannot be tested. Reliable pressure results cannot be obtained from these formations, nor can the fluids in these zones be identified because of poor flow potential. To overcome this major challenge, different probe (tool inlet) configurations are used that increase the flow area and help test tight formations (e.g., the 3D radial probe). In this study, 1754 stations were analyzed across several heterogeneous formation types and multiple operators to verify the diverse applicability of the 3D radial probe. The analysis was conducted in two phases. Formation testing results from the first phase showed that 47% and 68% of the points of interest in 2018 and Q1, Q2 of 2019, respectively, across all wells remained unevaluated with the conventional probe. Even among the points that gave valid results, there were low-mobility points where downhole fluid analysis (DFA) was not possible because of poor flow potential. Upon introducing the 3D radial probe in six wells, the shortfall of the conventional probe was overcome, which ultimately contributed to 35% additional evaluation success in 2018. In a comparison of the performance on the same wells and same formations, 3D radial probe fluid identification success in 2019 was 93% compared to 2% success in conventional probe evaluation in these tight reservoirs. Through this study, the uncertainty of fluid typing in the tight reservoir was resolved. Accurate interval permeability values were determined and were input to well deliverability estimates. The 3D radial probe results also help the drillstem test (DST) design, saving significant well cost because wet intervals are avoided using downhole fluid characterization, which revolutionizes formation testing in tight reservoirs.

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Revolutionising Formation Evaluation in Low Mobility Reservoirs of India

Ali

Ghosal

Singh

et al. 2020

Day 1 Mon, November 02, 2020

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Real-Time Computer Analytical Application in Pressure Transient Analysis of Petroleum Reservoirs

Khatri¹,

Shah²,

Pathan³

et al. 2013

IJG

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Today with certainty, the petroleum industry is fostering sanguinely the fields' development programs for the optimization of reservoir characterization through worth-full appliances of computer analysis techniques. The time element is of prime importance for optimistic petroleum development projects. Therefore, the frontline of "Real-time Analysis" is added into the applications of computer solving techniques for achieving and sketching up the real-time cost effectiveness in analyzing field development programs. It focuses on the phases of real-time well test data acquisition system, real-time secure access to the well test data either on field or in office and real-time data interpretation unit. This interface will yield the productive results for the field of reservoir's pressure transient analysis and wells' systems analysis by following the up-to-date preferred, accurate and effective well test analytical principles with modern real-time computer applications and techniques. It also lays emphasis for the comfort and reliability of data in creating best interpersonal working modes within a reputable and esteemed petroleum development organization.

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Comparing Wireline Formation Tester Derived Productivity Index to Drill Stem Test

Cited by 2 publications

References 16 publications

Revolutionising Formation Evaluation in Low Mobility Reservoirs of India

Revolutionising Formation Evaluation in Low Mobility Reservoirs of India

Real-Time Computer Analytical Application in Pressure Transient Analysis of Petroleum Reservoirs

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