Reservoir Evaluation and Development ›› 2018, Vol. 8 ›› Issue (5): 29-36.

• Reservoir Evaluation • Previous Articles     Next Articles

Water control diagnostic plots of carbonate reservoir based on the influence of casing channeling: A case of Rumaila complex multilayered carbonate reservoir of Ahdeb oilfield in Iraq

Cheng Liang   

  1. (Research Institute of Geological Exploration and Development, Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan 610500, China)
  • Received:2018-01-21 Online:2018-10-26 Published:2018-12-05


In order to guarantee the fast and professional solution about types of water production and mechanism of water invasion in the Rumaila complex multilayer carbonate reservoir of Ahdeb oilfield with casing channeling, high permeability zone and situation of commingled production, a fine reservoir model which can characterize the pure aquifer zone, oil-water transition zone and pure oil zone was built. On this basis, combined with analysis of water invasion velocity in each reservoir, the various simulation curves would be calibrated by the actual typical production curves to obtain the different typical water control diagnostic plots including casing channeling with bottom aquifer coning, bottom aquifer coning with later casing channeling, single casing channeling and the section of perforation located in the oil-water transition zone with later casing channeling(including different position of casing channeling: pure aquifer zone, oil-water transition zone and pure oil zone) with dimensionless time, which would be used to distinguish and analyze the reservoir water-producing type and rules. The results showed that the water control diagnostic plots could accurately obtain the water production type and rules, decrease the downhole PLT, SWFL and other tests, and provide reliable basis for the stabilizing oil and controlling water of vertical wells.

Key words: Iraq, Ahdeb oilfield, Rumaila reservoir, typical water production curve, control water measures

CLC Number: 

  • TE122.14