... illustrated promising results in terms of recovery factor for different EOR applications, such as CO 2 , surfactant, and natural gas. However, pilot tests performance reported contrast behavior due to misleading predicting for the EOR physics processes. This paper presents the experimental work to evaluate...

... Abstract Due to the mixed-wettability phenomenon found in Montney rock fabric, choosing the ideal flowback enhancer/surfactant to Enhance Post Frac Oil Recovery (EPFOR), has not been a straightforward task. Along with the wettability ambiguity, Montney exhibits nano-Darcy permeability making...

... Abstract Primary oil recovery from shales is very low, rarely exceeding 10% of original oil in place (OOIP). The low recovery has aroused a recent and growing interest in the petroleum industry for using Improved Oil Recovery (IOR) methods in shales. This paper presents a new semi-analytical...

... the leak-off and flowback processes. To evaluate the effects of surfactant solutions on the formation damage reduction we 1) measure the pressure drop across the core plug during both leak-off and flowback processes, and 2) evaluate the oil recovery factor during the leak-off process. The results...

... pressure, changes in the C1/C2 ratio occur along with liquid yields changes appearing to indicate that the liberation of adsorbed gas in effect. enhanced recovery gas injection method isotherm composition reservoir simulation organic matter complex reservoir mechanism shale gas Upstream Oil...

... the objectives, both black oil and compositional simulation models were generated for a Western Canadian tight reservoir containing volatile oil. In addition to primary, the EOR recovery processes that were considered include waterflooding, immiscible-N 2 and miscible-CO 2 gas flooding. Combinations...

... Abstract The objective of this paper is to couple wellbore and surface production facilities models with reservoir simulation for a shale reservoir that contains dry gas, condensate and oil in separate containers. The goal of this integration is to improve liquid recoveries by dry gas injection...

... Abstract The most commonly used technology for development of unconventional liquid-rich and light oil reservoirs is horizontal wells combined with large multi-stage hydraulic fracture treatments. However, even with these technological advancements, primary recovery factors are generally less...

... the number of clusters per stage and proppant mass per stage improves well production and recovery. However, the question is are these improvements short time gains, and what is the balance between well productivity and economics? Thirdly, in this study, we propose using measureable and known metrics...

... temperature and pressure of 5000 psi and 230°F (34.5 MPa, 110°C), and the recovered crude oil hydrocarbons were collected periodically and analyzed to determine the rates and efficiencies of oil recovery. For the 26 Middle Bakken and Three Forks rocks, hydrocarbon recovery upon CO 2 exposure averaged 86...

... Abstract Many stimulated shale gas wells experience surprisingly low fracturing fluid recoveries. Fracture closure, gravity segregation, fracture tortuosity, proppant distribution, and shut-in (soaking) time have been widely postulated to be the contributing factors. This study examines...

... Abstract Evaluation of enhanced liquid recovery from tight or shale reservoirs is currently of great interest to operators. One reason is the low primary oil recovery of tight/shale reservoirs, which ranges between 5-10% ( Shoaib and Hoffman, 2009 ) even after expensive multi-stage hydraulic...

... Abstract Enhanced oil recovery (EOR) processes using CO 2 in tight unconventional plays like the Bakken Formation are expected to be very different from the processes which control EOR in conventional reservoirs. During CO 2 EOR in conventional reservoirs, CO 2 flows through the permeable...

... value at reservoir temperature is approximately 10 6 m 2 for both target wells. These results are in agreement with RTA calculation of A Frac values for both target wells (≈ 10 6 m 2 ). Our estimated values of A Frac are also in agreement with the field data of water recovery. The well...

... since the 1950's. The unique physical properties of CO 2 allow for easy transport in pipelines as a gas, or by transport truck as a cold liquid. Oilfield uses include: a gaseous agent to assist in fluid recovery from the wellbore, a component in hydraulic fracture fluids, an enhanced oil recovery (EOR...

... the rest is retained within the kerogen matrix. In liquid rich shale plays, the hydrocarbons retained within the kerogen plays a key role in estimated ultimate recovery (EUR). However, the vapor-liquid equilibrium between oil and gas in shales is affected by the presence of kerogen. The conventional...

... be found as an adsorbed phase inside the coal matrix, so how much adsorbed gas can be released at an economical rate will determine the ultimate gas recovery. The Langmuir isotherm has been widely used in industry to describe the pressure dependence of adsorbed gas. However, temperature dependent...

... Abstract In certain production scenarios of multi-fractured unconventional wells, it appears that there exists the unexpected possibility that increasing the well's flowing pressure (decreasing the drawdown) can result in improved productivity and in larger Estimated Ultimate Recovery (EUR...

.... Furthermore, during the development phase, the depletion from parent wells leads to asymmetric hydraulic fracture growth on closely spaced infill wells. Parent wells may also be negatively impacted due to hydraulic fracture interference from new completions. These factors have led to poor hydrocarbon recovery...

... conventional thinking in shales, where ‘more water and less proppant is better’. Lamson (2013) reported that reduced volumes of water and increased concentrations of larger proppants resulted in better productivity. Also, adding nitrogen at 20% quality significantly increased load fluid recovery...