A series of long core experiments have been conducted at reservoir pressures, where a synthetic gas condensate fluid was used in order to study the flow of gas and condensate in the area of the reservoir close to the wellbore, and the region of the reservoir away from the producing wells. A horizontally orientated core was used in order to investigate flow of gas and condensate in the region around the producing wells, with the flow rates of gas and condensate being increased from capillary dominated to viscous dominated in order to observe the effect of flow rate on flow and recovery. The final flow velocities were comparable to field conditions around the wellbore region. A vertical core was used at similar pressures in order to simulate flow of condensate in a gravity and capillary dominated regime away from the producing wells, where viscous forces are negligible. The results of the horizontal core tests have highlighted that the mobility of condensate in the area around the wellbore may be greater than previously assumed. In the vertical core tests, the rate of free-fall gravity drainage of condensate at conditions where the interfacial tension between the gas and condensate was low has been measured. It has been shown that the reduction of the condensate saturation by drainage is in this gravity/capillary dominated regime can be considerable. Experimental methods such as those described in the paper are required in order to obtain suitable relative permeability curves for simulation purposes.
|Title of host publication||Proceedings of the SPE Annual Technical Conference and Exhibition. Part 3 (of 5)|
|Number of pages||10|
|Publication status||Published - 1993|
|Event||SPE Annual Technical Conference and Exhibition 1993 - Houston, TX, United States|
Duration: 3 Oct 1993 → 6 Oct 1993
|Conference||SPE Annual Technical Conference and Exhibition 1993|
|Period||3/10/93 → 6/10/93|