Assessment of Mud-Filtrate Invasion Effects on Borehole Acoustic Logs and 
Radial Profiling of Formation Elastic Parameters

Chi, Seokho; Carlos, Torres-Verdin; Wu, Ji; Alpak, Faruk O.

doi:10.2523/90159-ms

Cited by 3 publications

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“…al. [5] investigated the effect of mud-filtrate invasion on acoustic measurements and correct radial length of invasion using a numerical model called Biot- Chowdhury and Torres-Verdin [6] conducted a numerical study to determine the influence of mud-filtrate invasion in laminated sand-shale and sand-sand sequences on formation tester and acquired nuclear and resistivity measurements. They used a synthetic twodimensional (2D) numerical model to simulate mud-filtrate invasion process for drilling with water-based mud in an oil-bearing reservoir.…”

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Investigation of mud filtrate invasion using computational fluid dynamics

Won¹

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Despite continued research and developments in logging technology, logs processed by the prevalent standard methods continue to be influenced by formation damage and mud filtrate invasions. The mud-filtrate invasion and related formation damage due to drilling fluids can result in the misinterpreted values of rock and fluid properties in the reservoir which can affect the well plan. Well planning with accurate information of target reservoir is a very important part of any drilling procedure, as it would not only optimize drilling operation and completion but also maximizes production of oil and gas. To produce hydrocarbons effectively, the wellbore must communicate with formations beyond the altered zone and this can be accomplished by using proper perforations, penetration or creating fractures. Thus, the prediction of invaded zone is critical and a numerical model can be employed for preplanning purposes. In this study, the dynamic filtration process and the related penetrations into the gas and oil bearing reservoirs were studied in a vertical open hole system using a Computational Fluid Dynamics (CFD) software package. The radius of filtrate invasion was determined by the unsteady-state three-dimensional multiphase fluid flow model. The communication between fluids and formations during drilling and the effects of formation porosity and permeability, time, and overbalanced pressure were Suyoun Won INVESTIGATION OF MUD FILTRATE INVASION USING COMPUTATIONAL FLUID DYNAMICS ABSTRACT investigated extensively. Non-Newtonians drilling fluids such as Bingham plastic, Power-law, and Herschel-Bulkley fluids were also considered for the study. The Mud filtrate invasion in a multi-layer reservoir model and effect of hydraulic fracturing operations were examined. The results provide an insight on the formation damage around wellbore and related reduction in the hydrocarbon flow due to altered fluid saturations. The importance of accurate prediction of damaged zone around the well bore for the purpose of drilling fluid design, log interpretation, hydraulic fracturing and well completion is explicit from the results. iv ACKNOWLEDGEMENT This Thesis, "Study on formation damages under the various formation and operation conditions using Computational Fluid Dynamics", was suggested by Dr. Ilkin Bilgesu. First and foremost, the light of God's countenance has helped me in completing this thesis. A special word of thanks to my wife Minjae Lee, my father Jongtae Won, mother Youngbun Rho, and sisters Jihye and Eunhye. Without their everlasting love and support, this thesis would not have been success. I am truly grateful to my advisor Dr. Ilkin Bilgesu for his continued guidance, encouragement, and support throughout the development of this research.

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confidence: 99%

Investigation of mud filtrate invasion using computational fluid dynamics

Won¹

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Offset-Controlled Localized Velocity Inversion in the τ-p Domain Using Acoustic Traveltimes: Modeling and Application

Xu,

Zou,

2024

IEEE Trans. Geosci. Remote Sensing

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Optimization of 3-D Gas Permeability Measurement: Utilization of Field Data

Belhaj¹,

Mtawaa

Haroun

et al. 2009

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Gas permeability measurement is introduced to replace liquid permeability that has been associated with several complications and thus poses serious concerns. The resultant permeability value is an average property of the whole sample based on Darcy's approach. The Automated Probe Gas Permeameter (APGP) is gaining greater acceptance in lab and field applications for its simplicity and flexibility in measuring permeability at any petite spot on a sample surface and the ability to take measurements from irregular-shaped/different-sized samples at relatively short time intervals as compared to conventional techniques. The main concerns regarding the minimum sample size that can sustain permeability measurement, the question of how far the permeameter probe should be placed away from the boundary of the sample and the optimum size of the probe raise many doubts about the fate of this technology.The lab program utilized five standard Berea sandstone samples, three carbonate samples retrieved from currently producing oil reservoirs and one outcrop limestone sample. Obtained data have been analyzed using a designated regression package of modeling variograms. An analysis of bivariate modeling has been used to relate measured permeability to petrophysical properties of samples; mainly porosity, bulk permeability, pore throat quality/distribution and fracture parameters, if any.Existed concerns about the use of the Automated Probe Gas Permeameter have been investigated. Results show a strong relation between sample size, lateral/axial radius of investigation, and measured permeability. Other petrophysical properties show interesting, but moderate relationships. Fractured and vugy samples should be treated very carefully in terms of deciding probe position and data interpretation.Employment of set criterion may dramatically increase the implementation of the Automated Probe Gas Permeameter and improve confidence in resulting data. Field utilization of the equipment enhances efficiency in decision making right on the spot.

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Assessment of Mud-Filtrate Invasion Effects on Borehole Acoustic Logs and Radial Profiling of Formation Elastic Parameters

Cited by 3 publications

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Investigation of mud filtrate invasion using computational fluid dynamics

Investigation of mud filtrate invasion using computational fluid dynamics

Offset-Controlled Localized Velocity Inversion in the τ-p Domain Using Acoustic Traveltimes: Modeling and Application

Optimization of 3-D Gas Permeability Measurement: Utilization of Field Data

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