New Air Injection Technology for IOR Operations in Light and Heavy Oil Reservoirs

Kharrat

et al. 2014

J. Jpn. Petrol. Inst.

According to difficulties of producing heavy oil reservoirs, in-situ combustion (ISC) as one of the high efficient methods leads to reduce oil viscosity by increasing temperature. Since there are remarkable amounts of heavy oil reservoirs in the world and lots of experimental works have been carried out on sandstones, shale or oil sands, the research on carbonate rocks seems to be rare. The experimental tests were performed with the oil of 17.5° API and 8° API mixed with the crushed carbonate rocks of Asmari and Sarvak formations respectively to investigate the feasibility of ISC and calculate its parameters. According to experiments, combustion tube conducted vertically to use gravity as a force to minimize gravity segregation effects. Results show that combustion is technically applicable to the both rock-fluid systems. Additionally the percentages of CO2, O2 and CO have been measured by gas analyzer. Moreover, the effect of grain size on combustion temperature, connate water on oil recovery and front characteristics are investigated. Finally, fractured model of combustion tube is simulated and the effects of air injection rate, permeability, initial oil saturation and grid size are investigated. The obtained basic parameters of experiments are suitable for ISC implementation to fields efficiently.

Section: Introductionmentioning

confidence: 99%

Experimental and Simulation Study of <i>In-situ</i> Combustion Process in Carbonate Fractured Porous Media

Kharrat

et al. 2014

J. Jpn. Petrol. Inst.

“…Optimization of foam system. (1) The foam agents are optimized using Waring Blender method at room temperature and atmospheric pressure. 100mL of surfactant solution is put into the Waring Blender.…”

Section: Methodsmentioning

confidence: 99%

“…Air flooding and air foam flooding is the most attractive method for enhanced oil recovery both home and abroad [1][2][3]. Compared with conventional stimulations, air foam flooding has many advantages, such as relatively inexpensive, effectively controlling fluid mobility and improving sweep efficiency of low permeability reservoir [4].…”

Section: Introductionmentioning

confidence: 99%

Research and Application of Air Foam Flooding in Longdong Jurassic Reservoir

Shi

2011

AMR

Longdong Jurassic reservoir is a typical severe heterogeneous reservoir. Water flooding in this area is ineffective owing to water breakthrough and water flush. Laboratory experiments and field application of air foam flooding are described in this paper. Firstly, the air foam agent formula that suitable for Longdong Jurassic reservoir is selected as 0.5wt%HD-6 + 0.15wt%HD-Y by studying the foaming ability, stability and interfacial tension between oil and surfactant solution. The oil displacement results indicate that air foam flooding is more effective than the usage of surfactant waterflooding and air injection considering the amount of acquired recovery factor. In addition, process parameters of air foam flooding are determined by core flooding tests. The gas/liquid ratio is set to 3:1 and the chemical slug size is set to 0.9PV. Based on the experiments, air foam flooding is applied in Maling Block, the performance indicates that this technique can increase injection pressure, improve the injection profile of reservoir, decrease the water cut and improve the oil production.

“…Researches on the mechanism of the foam flooding began in the 1950s, Bond and Holbrook (1958) [1]first proposed it. In the next 40 years, people have conducted widespread thorough research to the use of foam on production [2][3] [4]. Many field tests on foam EOR have been carried out (Hoefner and Evans 1995[5]; Patzek 1996[6]; Turta and Sindhal 1998 [7]; Awan et al 2008[8]).…”

Section: Literature Referencesmentioning

confidence: 99%

Physical Simulation Experiment Research of Air Foam Flooding in Da Gang Oilfield

Xie

Sun

et al. 2014

AMR

Air foam flooding is an important means in tertiary oil recovery. As of July 2013, in the case of low recovery degree, Da Gang oilfield has entered high water cut period, thus increasing of recovery is under pressure. This experiment simulated the actual reservoir temperature and pressure, through the establishment of physical model, implemented a series of contrast tests, systematically evaluated four variable parameters, including gas liquid ratio, injection mode, permeability, and injection speed. Experimental results has cleared the effect of variable parameters on air foam flooding, so as to provide guidance for oilfield production.