Enhanced Heavy Oil Recovery After Primary Production Using Oil-Soluble Surfactant-Assisted Cyclic Mixed Solvent Injection Process

2019 ◽  
Author(s):  
Xiaofei Sun ◽  
Yanyu Zhang ◽  
Hao Zhao
Keyword(s):  
Primary Production ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Mixed Solvent ◽  
Heavy Oil Recovery ◽  
Solvent Injection ◽  
Injection Process ◽  
Soluble Surfactant ◽  
Surfactant Assisted

Investigation of Cyclic Solvent Injection Process for Heavy Oil Recovery

2010 ◽  
Vol 49 (09) ◽  
pp. 22-33 ◽  
Author(s):  
John Ivory ◽  
Jeannine Chang ◽  
Roy Coates ◽  
Ken Forshner
Keyword(s):  
Oil Recovery ◽  
Heavy Oil ◽  
Heavy Oil Recovery ◽  
Solvent Injection ◽  
Injection Process

Pore-Level Investigation of Heavy Oil Recovery During Water Alternating Solvent Injection Process

2009 ◽  
Vol 83 (3) ◽  
pp. 653-666 ◽  
Author(s):  
A. A. Dehghan ◽  
S. A. Farzaneh ◽  
R. Kharrat ◽  
M. H. Ghazanfari ◽  
D. Rashtchian
Keyword(s):  
Oil Recovery ◽  
Heavy Oil ◽  
Heavy Oil Recovery ◽  
Solvent Injection ◽  
Injection Process ◽  
Pore Level

scholarly journals Experimental Study of Heavy Oil Recovery Mechanisms during Cyclic Solvent Injection Processes

SPE Journal ◽  
2020 ◽  
pp. 1-16
Author(s):  
Maria Plata ◽  
Jonathan Bryan ◽  
Apostolos Kantzas
Keyword(s):  
Experimental Study ◽  
Primary Production ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Process Conditions ◽  
Heavy Oil Recovery ◽  
Oil Saturation ◽  
Solvent Injection ◽  
Pressure Depletion ◽  
Multiple Cycles

Summary The cyclic solvent injection (CSI) process has recently shown to be a promising method for enhanced heavy oil recovery in Canada. Laboratory testing is often run before development of field pilots to assess the effect of parameters, such as solvent choice and process conditions, on the CSI response. However, differences between laboratory results vs. field applications have been observed. CSI laboratory studies work for only two to three cycles due to low incremental oil in subsequent cycles, whereas field pilots continue for years over multiple cycles. This experimental study is intended to capture the production mechanisms responsible for heavy oil production in CSI. Primary production and CSI tests were conducted using sandpack models saturated with live heavy oil of 9530 mPa·s viscosity. The experiments were conducted in horizontal and vertical mode injection at high- and low-pressure depletion rates using two solvent mixtures of CH4 and C3H8. The sandpacks were scanned after every cycle to analyze the evolution of gas and oil saturations using computed tomography (CT). Three cores were used to study the effect of several parameters: gravity forces, pressure depletion rate, solvent composition, and initial oil saturation on the performance of CSI processes. CSI cycles run after primary production in horizontal systems produced negligible incremental oil for both slow and fast drawdown rates due to the large void space and high free gas saturation inhibiting the pressure buildup to push the solvent-diluted oil. These CSI experiments were only initially successful in dead oil systems, in which the initial oil saturation was higher and appropriate pressure gradient was generated through fast depletion rates. During the vertical alignment, CSI cycles exhibited higher incremental oil recovery per cycle. Slow depletion cycles were more efficient in terms of pressure and incremental recovery per cycle; however, faster depletion cycles performed better as a function of time. These results are more in line with the repeated recoveries measured over multiple cycles in field CSI pilot studies. More volume of diluted oil was drained out of the core when the solvent mixture with higher propane (C3H8) content was injected. These results demonstrate the importance of gravity drainage in the CSI process and its significance on successful oil recovery rates. This study illustrates the limitations of previous horizontal laboratory tests and shows an improved test configuration for modeling and prediction of the improved response observed in CSI pilots.

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