Small-scale modelling of pile drilling in sand – investigation of the influence on surrounding ground

Lande, Einar John; Ritter, Stefan; Tyvold, Henning; Nordal, Steinar

doi:10.1201/9780429321559-40

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“…Many attempts have studied the impact of many parameters such as polymer types, molecular weights, concentration, salinity, and the concentration of the surfactant on the performance of PEF. − Sydansk reported that the performance of PEF in the case of high viscous crude oil is better than that of less viscous crude oil. Sydansk also reported that PEF can help in injectivity due to its shear-thinning characteristics.…”

Section: Introductionmentioning

confidence: 99%

Mixed CO₂/N₂ Foam for EOR as a Novel Solution for Supercritical CO₂ Foam Challenges in Sandstone Reservoirs

2020

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Among the various enhanced oil recovery (EOR) processes, CO 2 injection has been widely utilized for oil displacement in EOR. Unfortunately, gas injection suffers from gravity override and high mobility, which reduces the sweep efficiency and oil recovery. Foams can counter these problems by reducing gas mobility, which significantly increases the macroscopic sweep efficiency and results in higher recovery. Nevertheless, CO 2 is unable to generate foam or strong foam above its supercritical conditions (for CO 2 , 1100 psi at 31.1 °C), and most of the reservoirs exist at higher temperatures and pressure than CO 2 supercritical conditions. The formation of strong CO 2 foam becomes more difficult with an increase in pressure and temperature above its supercritical conditions and exacerbated CO 2 -foam properties. These difficulties can be overcome by replacing a portion of CO 2 with N 2 because a mixture of N 2 and CO 2 gases can generate foam or strong foam above CO 2 supercritical conditions. Although many researchers have investigated EOR by using CO 2 or N 2 foam separately, the performance of mixed CO 2 /N 2 foam on EOR has not been investigated. This study provides a solution to generate CO 2 foam above its supercritical conditions by replacing part of CO 2 with N 2 (mixed CO 2 /N 2 foam). The mixed foam not only generates strong foam above CO 2 supercritical conditions but also remarkably increases the oil recovery. This solution overcomes the difficulties associated with the formation of CO 2 foam at HPHT conditions enabling the use of the CO 2 -foam system for effective EOR and other applications of CO 2 foam such as conformance control.

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Section: Introductionmentioning

confidence: 99%

Mixed CO₂/N₂ Foam for EOR as a Novel Solution for Supercritical CO₂ Foam Challenges in Sandstone Reservoirs

2020

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Small-scale modelling of pile drilling in sand – investigation of the influence on surrounding ground

Cited by 1 publication

References 0 publications

Mixed CO₂/N₂ Foam for EOR as a Novel Solution for Supercritical CO₂ Foam Challenges in Sandstone Reservoirs

Mixed CO₂/N₂ Foam for EOR as a Novel Solution for Supercritical CO₂ Foam Challenges in Sandstone Reservoirs

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Small-scale modelling of pile drilling in sand – investigation of the influence on surrounding ground

Cited by 1 publication

References 0 publications

Mixed CO2/N2 Foam for EOR as a Novel Solution for Supercritical CO2 Foam Challenges in Sandstone Reservoirs

Mixed CO2/N2 Foam for EOR as a Novel Solution for Supercritical CO2 Foam Challenges in Sandstone Reservoirs

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Product

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Mixed CO₂/N₂ Foam for EOR as a Novel Solution for Supercritical CO₂ Foam Challenges in Sandstone Reservoirs

Mixed CO₂/N₂ Foam for EOR as a Novel Solution for Supercritical CO₂ Foam Challenges in Sandstone Reservoirs