Determination of Insitu Reservoir Absolute Permeability Under Multiphase Flow Conditions Using Transient Well Testing

Kamal, Medhat M.; Morsy, Samiha; Suleen, Fnu; Pan, Yan; Dastan, Aysegul; Stuart, M. R.; Mire, Erin; Zakariya, Z.

doi:10.2118/175012-ms

Cited by 6 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After 48.16 hours, the λ t r, t of upstream saturation front increases, so ∂λ t r, t /∂t increases with time and ∂λ t r, t /∂t > 0 (Figure 9). According to (15), dΔP o t /d ln t is negative and decreasing with time. Table 2, the depths of OWC for case OW-1 and OW-9 are 4735 ft and 4700 ft, resp.…”

Section: Case Studymentioning

confidence: 99%

“…Some researchers proposed different scale models to study different types of reservoirs, such as fractured tight reservoirs [7,8], preferential flow path with non-Darcy flow reservoirs [9], mature waterflooding reservoirs [10], and shale gas reservoirs [11,12]. It is well known that the pressure logarithmic derivative curve has been used to identify true boundary model, but for multiphase flow well testing [13,14], it is much more complicated, there is a great influence on pressure derivative due to the changes of fluid properties in the transition zone [15][16][17]. For example, the logarithmic derivative of bottom-hole pressure goes up and then goes down in the late time for gas-water reservoir systems with an active aquifer underneath.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New Understanding of Transient Pressure Response in the Transition Zone of Oil-Water and Gas-Water Systems

Liu

et al. 2018

Geofluids

View full text Add to dashboard Cite

Well test analysis requires a preselected model, which relies on the context input and the diagnostic result through the pressure logarithmic derivative curve. Transient pressure outer boundary response heavily impacts on the selection of such a model. Traditional boundary-type curves used for such diagnostic purpose are only suitable for single-phase flow in a homogeneous reservoir, while practical situations are often much more complicated. This is particularly true when transient pressure is derived during the field development phase, for example, from permanent down-hole gauge (PDG), where outer boundary condition such as an active aquifer with a transition zone above it plays a big role in dominating the late time pressure response. In this case, capillary pressure and the total mobility in the transition zone have significant effect on the pressure response. This effect is distinctly different for oil-water system and gas water system, which will result in the pressure logarithmic derivatives remarkably different from the traditional boundary-type curves. This paper presents study results derived through theoretical and numerical well testing approaches to solve this problem. The outcome of this study can help in understanding the reservoir behavior and guiding the management of mature field. According to the theoretical development by Thompson, a new approach was derived according to Darcy’s law, which shows that pressure response in the transition zone is a function of total effective mobility. For oil-water system, the total effective mobility increases with an increase in the radius of transition zone, while for gas-water system, the effect is opposite.

show abstract

Section: Case Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Understanding of Transient Pressure Response in the Transition Zone of Oil-Water and Gas-Water Systems

Liu

et al. 2018

Geofluids

View full text Add to dashboard Cite

show abstract

Application of Pressure Transient Analysis and 4D Seismic for Integrated Waterflood Surveillance- A Deepwater Case Study

Suleen

Oppert

Chambers

et al. 2017

SPE Western Regional Meeting

View full text Add to dashboard Cite

A practical application of pressure transient analysis (PTA) and 4D seismic for monitoring movement of flood fronts and determination of hydrocarbon saturations in a waterflooded reservoir is presented. A novel workflow for quantitatively integrating 4D seismic data with PTA is described. At the injectors, pressure falloff tests were analyzed to reveal the progression of the flood fronts by using analytical radial composite models. Seismic interpretations of flood fronts were incorporated and refined in the numerical PTA model to examine flood front anisotropies. Sensitivity analysis with numerical PTA of the 4D interpreted flood fronts reduced uncertainties in their size, shape and location. Analytical and numerical PTA techniques were used to determine the range of pressure-saturation conditions in the reservoir at the time of the monitor seismic survey that could explain the lack of 4D signal around the producers. Unique multiphase effects were observed in producers -like the appearance of artificial "humps" in the derivative -which were explained by means of numerical models with gas saturation gradients. Results from the integrated 4D-PTA approach reduced uncertainties in the predicted pressure and saturations around the injectors and producers. The results from these techniques can be used to improve reservoir characterization and reduce uncertainties in remaining reserves. The integrative workflow can lead to upgrades in the reservoir-management strategies, increasing the realized economic value of both PTA and 4D technologies. Application of the integrated PTA-4D techniques allow for early field intervention and optimized placement of development wells.

show abstract

Design and Interpretation of an Interference Test for Determination of Formation Compressibility in a Deepwater Reservoir

Suleen

Urbanczyk

Williams

et al. 2017

SPE Western Regional Meeting

View full text Add to dashboard Cite

The design and interpretation of an interference test for determination of formation compressibility in an offshore waterflood is presented. Interference well testing resolves some of the limitations posed by laboratory measurements of formation compressibility, i.e. the sample size is bigger, measurements are made in-situ and the method can be applied reliably in unconsolidated formations. Analytical and numerical PTA (Pressure Transient Analysis) models were used to select the active and observation wells and to design the interference test in terms of lag and lead times associated with the opening and closing of these wells. Some neighboring wells remained on production in between active and observation wells while the interference test was performed due to production constraints. This led to the challenge of unravelling the interference signal from the noise of continued production. Permanent downhole gauge data were utilized in seeking out the interference response at the observation well. Once the interference response was identified, the storativity (porosity-total compressibility product) was determined using the flow capacity (permeability-thickness product) calculated from the pressure and rate history at the active and observation wells. Formation compressibility was then calculated using log derived porosity values. Interference test analysis showed that the formation compressibility was significantly smaller than the pre-test estimates from the lab. The analysis resulted in narrowing of the uncertainty around formation compressibility that was later utilized in field production forecasts. Presence of high frequency high resolution data was critical in deciphering the interference signal. The breakthroughs came by using a range of the calculated flow capacity and total fluid compressibility in determining in-situ formation compressibility, which was in line with an offset analog field that had reliable laboratory measurements. The major impact of this work is in proposing a method for determination of formation compressibility in complex reservoirs and production systems from interference well tests utilizing permanent downhole gauge data.

show abstract

Determination of Insitu Reservoir Absolute Permeability Under Multiphase Flow Conditions Using Transient Well Testing

Cited by 6 publications

References 9 publications

New Understanding of Transient Pressure Response in the Transition Zone of Oil-Water and Gas-Water Systems

New Understanding of Transient Pressure Response in the Transition Zone of Oil-Water and Gas-Water Systems

Application of Pressure Transient Analysis and 4D Seismic for Integrated Waterflood Surveillance- A Deepwater Case Study

Design and Interpretation of an Interference Test for Determination of Formation Compressibility in a Deepwater Reservoir

Contact Info

Product

Resources

About