Effect of Mobility Ratio on the Pressure and Pressure Derivative of Wells in Closed Composite Reservoirs

Boussalem, Rachid; Tiab, Djebbar; Escobar, Freddy Humberto

doi:10.2118/76781-ms

Cited by 5 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For transient rate analysis, refer to [27,35,49]. Applications on heavy oil (non-Newtonian fluids) can be found in [32, 34, 41, 42, 45, oil recovery is presented by [25,33,60,79]. For multirate testing in horizontal and vertical wells, refer, respectively, to [65,67].…”

Section: Tiab's Direct Synthesis (Tds) Techniquementioning

confidence: 99%

Novel, Integrated and Revolutionary Well Test Interpretation and Analysis

Macualo¹

2019

View full text Add to dashboard Cite

Well test interpretation is an important tool for reservoir characterization. There exist four methods to achieve this goal, which are as follows: type-curve matching, conventional straight-line method, non-linear regression analysis, and TDS technique. The first method is basically a trial-and-error procedure; a deviation of a millimeter involves differences up to 200 psi and the difficulty of having so many matching charts. The second one, although very important, requires a plot for every flow regime, and there is no way for verification of the calculated parameters, and the third one has a problem of diversity of solutions but is the most used by engineers since it is automatically made by a computer program. This book focuses on the fourth method that uses a single plot of the pressure and pressure derivative plot for identifying different lines and feature for parameter estimation. It can be used alone and is applied practically to all the existing flow regime cases. In several cases, the same parameter can be estimated from different sources making a good way for verification. Combination of this method along with the second and third is recommended and widely used by the author. TDS technique is quite versatile. The user finds the different flow regimes and, then, draws a line through it. From an arbitrary point on each flow regime, a given parameter can be calculated. Besides, the intersection point between the extrapolated flow regimes, although do not have a physical meaning, is excellent to find another reservoir parameter or the verification of others. For instance, well-drainage area can be readily estimated from the intersect point formed between the radial flow regime and the late pseudosteady state period. Every time someone starts working using TDS technique, he or she never stops. The reader is invited to give it a try.

show abstract

Section: Tiab's Direct Synthesis (Tds) Techniquementioning

confidence: 99%

Novel, Integrated and Revolutionary Well Test Interpretation and Analysis

Macualo¹

2019

View full text Add to dashboard Cite

show abstract

“…Jokhio et al (2001) and Hachlaf et al (2002) extended the Tiab's direct synthesis technique to analyse injection and fall off tests in water injection wells, and the problem was described and solved as a composite reservoir. Boussalem et al (2002) developed an analytical model for a closed composite reservoir and used Tiab's direct synthesis technique for composite reservoir to investigate the effect of mobility ratio and radius ratio on the pressure response. Escobar et al (2012) developed a methodology to analyse pressure and pressure derivative for three-region composite reservoir and to estimate mobility and distance to discontinuities.…”

Section: Introductionmentioning

confidence: 99%

Estimating distance to water front for edge water using derivative of pressure transient data

Alrumah

Ertekin

2016

IJOGCT

View full text Add to dashboard Cite

New procedures are proposed to help estimate the distance to the discontinuity under certain conditions with good accuracy. These procedures can be applied using the derivative of the pressure buildup test data if the mobility ratio is less than unity. A 3-D numerical model is used to generate pressure transient data from synthetic data for a vertical well. The reservoir is considered as a composite reservoir where the inner zone contains the oil phase, and the outer zone contains the water phase. Some of the parameters that control the accuracy of the proposed analysis procedure are the producing time and the external reservoir radius. The procedures are useful in monitoring the position of the edge water front for future planning development purposes.[porous media including shale oil, shale gas and coalbed methane reservoirs. He, with his graduate students, works in the implementation of advanced simulation, well testing and artificial intelligence technologies to the 2 M. Alrumah and T. Ertekin aforementioned reservoir systems. His research efforts with his graduate students have produced more than 100 PhD and MS theses. He is the author and co-author more than 250 publications including four books and has given more than 250 lectures and seminars, workshops and short courses throughout the world.

show abstract

“…In 1993, Tiab introduced the TDS Technique for interpreting log-log pressure and pressure derivative plots by using analytical solutions to determine permeability, skin and wellbore storage without employing type-curve matching. This revolutionary technique, already extended to many other systems (Boussalem, et al, 2002;Tiab and Escobar, 2003), uses such unique features as lines, intersection points, and other "fingerprint"characteristics found on the pressure and pressure derivative log-log plot to develop analytical equations to readily obtain reservoir parameters. The main objective of this paper is to extend TDS Technique for the case of wells with partial penetration and partial completion.…”

mentioning

confidence: 99%

Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching

Escobar,

Moncada,

Tiab

et al. 2005

CT&F Cienc. Tecnol. Futuro

View full text Add to dashboard Cite

it has been long recognized that in some reservoirs the flow does not follow the expected radial cylindrical pattern. Spherical flow may take place in systems with wells completed in thick reservoirs where a short completion interval is open to flow yielding a unique and more complex early-time pressure behavior. Some of the main reasons for partial penetration are to avoid coning of water and minimize sand production. A similar early-time pressure behavior may be due to the presence of plugged perforations. Such well completions are referred to as limited-entry, restricted-entry or partially penetrating wells. A typical case of spherical propagation of pressure transients occurs during the repeat formation tester measurements. Such a test measures spot formation pressures and recovers formation fluid samples for gaining an insight into the reservoir flow mechanics. The purpose of this study is to identify on the pressure and pressure derivative curves the unique characteristics for different flow regimes resulting from these type of completions and to determine various reservoir parameters, such as vertical, horizontal permeability, and various skin factors. The interpretation is performed using Tiab’s Direct Synthesis (TDS) Technique, introduced by Tiab (1993), which uses analytical equations obtained from characteristic lines and points found on the log-log plot of pressure and pressure derivative to determine permeability, skin and wellbore storage without using type-curve matching. The extension of this methodology for the case under study includes wellbore storage and skin effects. It is applied to both drawdown and buildup tests. We found that a spherical or hemispherical flow regime occurs prior to the radial flow regime whenever the penetration ratio of about 20%. A half-slope line on the pressure derivative is the unique characteristic identifying the presence of the spherical/hemispherical flow. The typical half-slope line of theses flow regimes is used to estimate spherical permeability and spherical skin values. These parameters are then used to estimate vertical permeability, anisotropy index and skin. Results of TDS technique where successufully compared to those of conventional technique for field and simulated examples.

show abstract

Effect of Mobility Ratio on the Pressure and Pressure Derivative of Wells in Closed Composite Reservoirs

Cited by 5 publications

References 9 publications

Novel, Integrated and Revolutionary Well Test Interpretation and Analysis

Novel, Integrated and Revolutionary Well Test Interpretation and Analysis

Estimating distance to water front for edge water using derivative of pressure transient data

Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching

Contact Info

Product

Resources

About