New Cumulative Rate Convolution Analysis for Closed Chamber Test

Li, Zhan; Liu, Lu; Chen, Qinlei

doi:10.2118/28406-ms

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Various ways of interpreting this type of data have been presented, aiming at inverting the convolution principle from flow-rate measurements. Zhan et al 6 offered a contribution on that subject, as well as a comprehensive review.…”

Section: Methodsmentioning

confidence: 99%

Use of Downhole Production/Reinjection for Zero-Emission Well Testing: Challenges and Rewards

Florian¹,

Filas²,

Bennett³

et al. 2002

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn recent years, HSE concerns have been a driving force pushing towards emission-free well testing. Several methods have been proposed in order to attain that objective, the two most known being closed-chamber testing and downhole production/reinjection. With closed-chamber testing being of limited interest because of the reduced radius of investigation it offers, and harmonic testing being impractical due to time requirements, downhole production/reinjection appears as the only way of fully replacing conventional well testing.Planning such a test requires greater care than for a conventional test because the selection of an adequate injection interval is of major importance to the success of such an operation. The injected fluids must be contained within the disposal zone so as to avoid surface leakage but also so that the test data are not affected by an interference effect due to the injection process. There is also a great concern regarding the quality of the data because of hard downhole conditions. But if these challenges can be overcome, downhole production/reinjection can provide the same information as a conventional well test but with improved safety, no direct emission of pollutants and at reduced cost and test duration.

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Section: Methodsmentioning

confidence: 99%

Use of Downhole Production/Reinjection for Zero-Emission Well Testing: Challenges and Rewards

Florian¹,

Filas²,

Bennett³

et al. 2002

Proceedings of SPE Annual Technical Conference and Exhibition

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“…This variable flow rate presents a complicated condition for the development of pressure analysis techniques. The Impulse Testing and short producing time algorithms (Soliman, 1986;Ayoub et al, 1988) do not use any specific flow rate history in the data interpretation, while the convolution methods (Simmons, 1990;Tariq, 1989;Zhan et al, 1994) require accurate and detailed rate history. The former category often does not have adequate accuracy since the flow rate variation imposes its signature on the pressure data (Kuchuk, 1999).…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…The solutions developed by assuming constant wellbore storage are unlikely to match the pressure history of a UPB test, so the interpretation results will not be reliable. The last category of the techniques relies on convolution formulae to estimate the formation properties for surge tests (Simmons, 1990;Tariq, 1989;Zhan et al, 1994). This type of solutions modifies the conventional convolution algorithms for variable flow rate tests (Meunier et al, 1985;Kuchuk and Ayestaran, 1985) to either accommodate the initial underbalanced condition or take advantage of the small flow rate at late test time in handling skin during a surge test.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Skin Variation for Underbalanced Perforating

Zhan

Kuchuk

Filas

et al. 2008

SPE International Symposium and Exhibition on Formation Damage Control

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Reliable estimates of post perforation damage skin are important for designing remedial solutions and productivity enhancement operations. Underbalanced perforating (UBP), which is widely used in well completions, induces transient fluid flow that provides an opportunity for quantifying the formation parameters. However, the skin factor can rarely be estimated reliably from pressure data acquired in the current UBP operations if without flowing on surface in sufficient time. The reasons are that (a) the flow rate after an UBP continuously varies during the surge; (b) the skin factor may decrease substantially during the flow period because the mud cake, invaded filtrates, and particulate pore plugging are progressively removed at the vicinity of the sandface region; (c) the crashed layer of the perforation tunnels is cleaned up. The existing pressure transient analysis methods to determine the skin were almost exclusively developed with an assumption that the skin factor remains constant during a test. The conventional analyses do not represent the underlying physics of the surge flow and lead to loss of useful information from the skin variations. Few SPE papers have investigated the variable skin condition with a simple hyperbolic function for a constant rate drawdown. The constant rate drawdown assumption is not suitable for the UBP as the flow rate varies along with the changes in the skin (during clean-up) and the wellbore pressures.We present a general formula to handle the skin variation resulting from the UBP and other surge flow tests. This formula extends the applications of a classic convolution algorithm to include variations in the skin and flow rates. New analytical solutions have been derived for both homogeneous and heterogeneous reservoirs based on the general convolution formula. The new solutions are applied to an integrated interpretation workflow to invert the skin variation as well as other formation parameters from pressure measurements. A field example, where both the skin and flow rate vary, demonstrates a successful application of the new solutions and interpretation methodology. The inferred skin variation allows a complete and detailed quantification of the perforation quality and cleanup efficiency. The results of this work enable the implement of better strategies for well completions and production optimization as well as correct inputs of nodal analysis.

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Acquiring Accurate Reservoir Data During TCP To Maximize Oil Production and Increase ESP Run Life

Shumakov

Hollaender

Sarac

et al. 2018

Day 2 Thu, November 29, 2018

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Impulse testing using a simple drillstem testing (DST) or tubing-conveyed perforating (TCP) string is reinvigorated by employing a bidirectional wireless acoustic telemetry system. Paired with enhanced-functionality downhole test tools, the innovative approach reduces the cost of testing while providing critical data for completion design, reservoir monitoring and electric submersible pump (ESP) sizing. Over 46% of all the reported premature pump failures today are associated with incorrect equipment selection and pump sizing. It is mainly due to a lack of reliable reservoir information and especially in new wells without any historical production data (Vandevier, 2010).Operating the pump outside its specified range due to incorrect sizing can cause either a severe downthrust or upthrust condition that results in premature wear of the pump stages and reduces the expected life. It is mainly associated with incorrect pump sizing due to a lack of reliable reservoir information. The oil industry has long sought improvements in performing reservoir characterisation and acquiring dynamic reservoir and well data necessary for ESP sizing, especially in new wells without historical production data. The proposed new methodology and a unique impulse testing technique allow acquiring reservoir data for proper pump sizing. The impulse testing is not a new concept that allows testing the wells using a simple DST or TCP strings with no flow of hydrocarbon at the surface. This allows the cost to be reduced in comparison with conventional DST operations or any other testing methods. A new impulse testing technique uses bi-directional wireless acoustic telemetry system to acquire real-time bottom hole pressure data and interface with remote-controllable new-generation downhole tools, such as a tester valve, circulating valve, firing head, or fluid sampler, to issue commands and verify tool status. The acquired data credibly represent reservoir pressure, fluid properties, and well inflow performance that can be used for proper pump sizing.

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New Cumulative Rate Convolution Analysis for Closed Chamber Test

Cited by 4 publications

References 26 publications

Use of Downhole Production/Reinjection for Zero-Emission Well Testing: Challenges and Rewards

Use of Downhole Production/Reinjection for Zero-Emission Well Testing: Challenges and Rewards

Quantifying Skin Variation for Underbalanced Perforating

Acquiring Accurate Reservoir Data During TCP To Maximize Oil Production and Increase ESP Run Life

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