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Boundary effects in diagnostic plots

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Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 23–April 1, 2021
Paper Number: IPTC-21373-MS
..., special diagnostics of the multi well interference models will be required to differentiate between the boundary and interference effects. In addition, there is no analytical method for a well in a multi-well reservoir with no flow boundary condition. In this paper a new method was developed to model...
Journal Articles
J Pet Technol 46 (02): 157–162.
Paper Number: SPE-25922-PA
Published: 01 February 1994
..., the initial pressure response may be distorted or dominated by wellbore storage effects and therefore may not show the early-time radial flow charac- teristics discussed below. For a constant wellbore storage coeffi- cient, C, wellbore~storage-dominated flow is identified on the diagnostic plot by a col...
Proceedings Papers

Paper presented at the SPE Nigeria Annual International Conference and Exhibition, July 31–August 2, 2017
Paper Number: SPE-189138-MS
... diagnostic pressure derivative responses plotted in log scale to show end of ‘wellbore storage effect’, ‘infinite acting radial flow period’ and ‘boundary effect phase’. Kappa's Ecrin Saphir Software was used for this design. The reservoir and well model, as well as flowing data were fed...
Journal Articles
J Pet Technol 70 (02): 62–68.
Paper Number: SPE-0218-0062-JPT
Published: 01 February 2018
... trends or clumping or scattering of data points, particularly at early production times. On the basis of the information gathered from the diagnostic plots and well-history files, nonrepresentative production data points that are likely the result of nonreservoir effects or operational changes...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, February 21–23, 2022
Paper Number: IPTC-22481-MS
... by using production data and wellhead pressure monitoring, with a "good-match" VLP correlation; Fetkovich's, Agarwal's and Blasingame's plots are prepared for a sound diagnostic to identify early time features (presence of micro-fractures, unusual wellbore storage, variable skin effect, flow regimes...
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 10–12, 2003
Paper Number: PETSOC-2003-201
... field example diagnostic plot radial superposition time boundary constant pressure infinite reservoir upstream oil & gas drillstem/well testing logarithmic superposition time pressure transient testing superposition time pressure transient analysis radial flow drillstem testing...
Proceedings Papers

Paper presented at the SPE Liquids-Rich Basins Conference - North America, September 2–3, 2015
Paper Number: SPE-175530-MS
... are not seen in rate-time diagnostic plots. Conclusions The following conclusions can be drawn from this work: Gas condensate wells in shales exhibit a long transition period between the end of linear flow and the start of boundary dominated flow. Pressure normalization is an effective method...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 12–15, 2018
Paper Number: SPE-193024-MS
...) is not best suited to forecast unconventional reservoirs. This is due, in part to a variety of reasons the most important being lengthy transition zones from transient flow to boundary-dominated flow which is highlighted in this paper via the usage of diagnostic plots. The objective of this paper...
Journal Articles
SPE Res Eval & Eng 20 (03): 589–601.
Paper Number: SPE-184397-PA
Published: 26 October 2016
... and the transient-GOR-plateau level in an area can help one interpret where a well is in its GOR history. Rate-transient-analysis (RTA) diagnostic plots are altered by rising GOR, and sometimes show an early unit slope. During boundary-dominated flow, GOR is more a function of cumulative production than of time...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, July 26–28, 2021
Paper Number: URTEC-2021-5222-MS
... 0.00316882 rcf/scf URTeC 5222 14 In the analysis of the field data, expansion effects are considered with constant compressibility values of rock and water as given in Table 6. Boundary dominated flow regime is identified after 400 pseudotime days on a log-log diagnostic plot of derivative of rate-normalized...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, August 1–3, 2016
Paper Number: URTEC-2460396-MS
... interpret where a well is in its GOR history. Rate transient analysis (RTA) diagnostic plots are altered by rising GOR, and sometimes show an early unit slope. During boundary-dominated flow, GOR is more a function of cumulative production than of time; wells with closer fracture spacing have a faster GOR...
Proceedings Papers

Paper presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, February 5–7, 2019
Paper Number: SPE-194348-MS
... of the pressure derivate plots and also the closure stress. In this paper we present and use an advanced fracture diagnostic model that can help recognize the signatures of rock fabric features and their impact on estimation of the closure stress. An example field data is used to illustrate the potential impact...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 3–6, 1999
Paper Number: SPE-56424-MS
... of producing time. The channel boundaries influence the buildup response, even when the flow period preceding buildup terminates before the boundaries are seen. Again, the equivalent time diagnostic plot, Fig. 11 , shows the time scale compression effect. For this reservoir model, an equivalent time based...
Journal Articles
J Pet Technol 73 (04): 60–61.
Paper Number: SPE-0421-0060-JPT
Published: 01 April 2021
... demonstrate that boundary permeability causes an upward trend in RTA Motifs effects (through departure from linear the RTA plot because the effective perme- Each RTA motif is generated using a sim- flow) and PDP (through system perme- ability has been reduced. ulation model constructed with a single ability...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 23–26, 1990
Paper Number: SPE-20550-MS
... with these diagnostic plots has shown that the shape of the classical derivative response depends on the overall well test sequence. These discrepancies typically occur in late time and can interfere with the correct characterization of boundary effects. Model diagnosis entails pattern recognition, during which...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, August 25–27, 2014
Paper Number: URTEC-1928491-MS
... with multiple fracturing stages. Using the flow diagnostic and specialized plots, four flow regimes were identified (early linear in the fracture system, bilinear in the matrix-fracture system, linear in the matrix, and boundary-dominated) and the reservoir parameters were calculated for constant flowing...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 8–10, 2012
Paper Number: SPE-159710-MS
.... Liquid loading will cause a sudden decrease in the production rate at later times when the reservoir energy experiences significant depletion. On a log-log diagnostic plot, this rate will be on a unit slope line. Interference Effects—Interference effects would either cause the production rate...
Journal Articles
J Pet Technol 67 (09): 111–112.
Paper Number: SPE-0915-0111-JPT
Published: 01 September 2015
... an impact on the derivative trend, especially for late elapsed times and interpreting boundary effects. Simulation of the well history in the linear scale with the analytical model used for the pressure and derivative interpretations in the log-log scale improves reliability of the analysis. The simulated...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187264-MS
... identify and replicate 75% of the manually identified tops, generally to within ±1 meter of significant boundaries picked by the program. Furthermore, we argue that the surfaces that comprise the missing 25% may not be significant, framework building surfaces and could be ignored with little effect...
Proceedings Papers

Paper presented at the SPE Middle East Oil & Gas Show and Conference, March 6–9, 2017
Paper Number: SPE-183860-MS
... identify and replicate 75% of the manually identified tops, generally to within ±1 meter of significant boundaries picked by the program. Furthermore, we argue that the surfaces that comprise the missing 25% may not be significant, framework building surfaces and could be ignored with little effect...

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