Effect of Shape Factor, IFT and Amott Method Derived Wettability on the Imbibition Process

Ghedan, Shawkat G.; Canbaz, Celal Hakan; Mtawaa, Bechir

doi:10.2523/iptc-14038-ms

Cited by 2 publications

(1 citation statement)

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“…Manual shaking of the Amott cell (Graue et al, 1999;Cobos et al, 2021) or scratching the core plug surface with a teflon road (Morrow et al, 1999;Zhou et al, 2000) helped minimize this effect, but did not yield completely smooth recovery profiles. Some authors conducted imbibition experiments with a core plug placed horizontally to minimize the effect of buoyancy displacement (Zhou et al, 2000;Ghedan et al, 2009). In other works, the flow was restricted in radial direction by sealing the top and bottom faces of a core plug with epoxy resin (Xie and Morrow, 2001;Sukee et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Improved Amott Tests Help Quantify Primary Driving Forces in Spontaneous Imbibition in Water-Wet and Oil-Wet Limestone Rock

Kaprielova

Yutkin

Gmira

et al. 2023

Day 1 Sun, February 19, 2023

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The improved oil recovery techniques, such as customized ionic composition waterflood or "smart-water" flood, are being developed to increment crude oil production. Counter-current spontaneous imbibition of brine into oil-saturated rock is a critical mechanism of recovery of the crude oil bypassed in highly-heterogeneous carbonate rocks. In laboratory, spontaneous imbibition in the Amott cell experiment is the main instrument to explore oil recovery from oil-saturated core plugs at different wettability conditions. The classical Amott test, however, masks a number of flaws that hinder interpretation of the physical phenomena in recovery dynamics and precise modeling of the cumulative recovery profiles. In this work, we identify these flaws in the spontaneous imbibition experiments with mixed-wet limestone samples saturated with crude oil. We describe an improved Amott method and study crude oil recovery from mixed-wet carbonate core plugs. The introduced modifications of the Amott test ensure reliable and reproducible results for both non-wetting mineral and crude oils. Finally, we show that the resulted smooth recovery profiles of oil production can be described with a mathematical model with high accuracy. For the first time, we show that generalized extreme value (GEV) distribution can be applied to model cumulative oil production from mixed-wet carbonate core samples.

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Section: Introductionmentioning

confidence: 99%

Improved Amott Tests Help Quantify Primary Driving Forces in Spontaneous Imbibition in Water-Wet and Oil-Wet Limestone Rock

Kaprielova

Yutkin

Gmira

et al. 2023

Day 1 Sun, February 19, 2023

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Boosting Production in the Llanos Orientales Colombia Basin, with an Approach to the Usage of the Completion Fluid. A Recent Case Study

Lozano

Daza

Gomez³

et al. 2021

Day 3 Thu, September 23, 2021

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This arcticle highlights the importance of a systematic step change approach to the formulation of completion fluids in the Llanos Basin (LLAB), Colombia, when formation-freshwater is to be used as control - completion (C&C) fluid. The results demonstrate that the process used reduced the formation damage statistics from 41% of the wells drilled to only 16%, boosting production and establishing a best practice for future drilling and completion (D&C) campaigns in the region. An initial sample of 19 wells was considered to evaluate the damage caused by using formation-freshwater as C&C fluid. Formation-freshwater was selected only considering the fluid density (wellbore pressure), ignoring the negative effects it can have on formation damage. 41% of the wells were damaged, as evidenced by pressure build up. Some of the main damages on the pay-zone in an oil well are due to emulsion blocking, change in wettability, swelling and migration of clays, incompatibility of fluids, and scale formation. A detailed design of completion fluids has a positive influence over well productivity by mitigating formation damage before starting the production stage. The methodology used was aimed at designing the C&C fluid through a step-by-step approach, consisting of: 1) Laboratory tests supported with mineralogical data and oil and formation water properties and 2) Physical-chemical analysis of reservoir fluids and water for mixing purposes. The process involved testing different formulations and then their implementation in the field. The initial tests were conducted in a total of 5 wells in 4 fields. Changes were identified in the formulation to achieve optimal fluid design for each field and then the selected fluid was extended to a total of 24 wells. This was the first time a thoroughly designed completion fluid was used in the region. The results point towards the need to include surfactants, mutual solvents, and brines to substantially reduce formation damage. The application of new completion fluids enabled the operational teams to optimize the process by steps. The implementation of customized completion fluid reduced the formation damage as evidenced through productivity analyses and pressure build up tests. Only 16% of the wells presented formation damage. The process applied to reduce formation damage of the Llanos Basin led to a systematic approach for the analysis stage, which may be applied in other areas, where the utilization of formation-freshwater is an issue. The particularly short time frames and best practices derived from the learning curve of this case are worth to be shared with other operators.

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Effect of Shape Factor, IFT and Amott Method Derived Wettability on the Imbibition Process

Cited by 2 publications

References 0 publications

Improved Amott Tests Help Quantify Primary Driving Forces in Spontaneous Imbibition in Water-Wet and Oil-Wet Limestone Rock

Improved Amott Tests Help Quantify Primary Driving Forces in Spontaneous Imbibition in Water-Wet and Oil-Wet Limestone Rock

Boosting Production in the Llanos Orientales Colombia Basin, with an Approach to the Usage of the Completion Fluid. A Recent Case Study

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