Investigating multi cyclic gas (N2 and CO2) huff and puff have been conducted by long sandpack simulations with four different crude oils from Jiangsu oilfield. According to the production differential pressure and the production regularity during huff and puff, the production process was divided into three sections; the first one is free gas production section; the second section is low viscou...

Abstract: The oil recovery factor from shale oil remains low, about 5 to 7% of the oil in place. How to increase oil recovery from shale oil reservoirs is attracting more and more attention. CO2 huff-and-puff was historically considered one of the best approaches to improve the oil rate. Most previous simulation studies have been based on dual porosity, but simulation results from dual-porosity...

Cyclic solvent injection, known as huff-n-puff, is one of the promising techniques for enhancing oil recovery from shale reservoirs. This study investigates huff-n-puff performance in ultratight reservoirs by conducting large-scale numerical simulations a wide range reservoir fluid types (retrograde condensate, volatile oil, and black oil) different injection gases (CO2, C2H6, C3H8). A dual-por...

Water huff-n-puff is one of the effective energy supplement methods for development tight oil reservoirs by horizontal wells. However, production performance water severely decreases after several cycles. Available researches indicate that inter-fracture asynchronous injection-production technology well an efficient method improving huff-n-puff. considering object huffn- puff single well, study...

Актуальность. Перспективным направлением разработки нефтяных месторождений является применение нетрадиционных способов добычи трудноизвлекаемых запасов. Особый интерес уделяется технологиям использования углекислого газа в условиях политики снижения углеродного следа мировом энергобалансе. Диоксид углерода одним из наиболее эффективных вытесняющих агентов для повышения нефтеотдачи пластов, кото...

In view of the deterioration oil well liquid supply capacity and increase effect after multiple rounds carbon dioxide (CO2) huff puff, according to actual conditions Ng12 reservoir in XA oilfield, an indoor physical simulation experimental model was established. The parameters were determined, five CO2 puff experiments carried out, crude produced water flooding stage different collected. effect...

With the gradual declining of oil increment performance CO2 huff-and-puff wells, overall exchange rate shows a downward tendency. In this regard, synergistic technologies have been proposed to maintain excellent effect and extend technical life such wells. However, there is no specific research on mechanism mode huff puff in horizontal This study aims establish determine adaptability acting puf...

Field observations have shown that interference between wells caused by connected fractures commonly exists in unconventional reservoirs. The well effect and conformance issues could lead to minimal enhanced oil recovery response (EOR) actual operations if they are not properly controlled. A series of data analysis, modeling, experimental activities were performed this study investigate the gas...

The Chang 7 continental shale oil reservoir is tight. recovery factor extremely low, the remaining very high, and injecting water to improve effectiveness too hard. Therefore, in this paper, physical simulation experiments of CO2 huff-n-puff NMR tests were conducted study cycle numbers permeability on degree, as well characteristics mobilization micro distribution. results showed that cumulativ...

Abstract Tight oil reservoirs have poor physical properties, and the problems including rapid rate decline low recovery degree are quite common after volume fracturing. To obtain a general understanding of tight reservoir production improvement by CO 2 huff ‘n’ puff, high-pressure properties typical samples measured. Combining parameters, characteristics developed puff numerically studied on ba...