Water breakthrough(WBT)in the horizontal wells often leads to water flooding in the well,especially tothose heavy oil reservoirs in reef limestone carbonate.The excessive water production from the hydrocarbonproducing horizontal wells can adversely affect the economic life of the well,furthermore this could resultin the well permanent abandonment.Nowadays,no effective methods of water control are available for thesimilar reservoirs,traditional water control methods have three technology barriers:(1)can not accuratelylocate the WBT positions;(2)difficulty of identifying the wellbore completion,fluid,and nearby formationconditions;(3)Not being designed to control water from new water breakthrough points.This paper shows a newly developed water control technology by using continuous Packed-off doublewater control technology(CPI).It was successfully implemented in a well of a fractured reef limestone oilfield in South China Sea.This technology completely overcome the above shortcomings of traditional watercontrol methods.The mechanism is to pack patent particles into the wellbore and near-wellbore fracturesto create a double"artificial well wall".It suppresses radial and axial turbulence effectively.The operationprocedure of CPI water control method is simple.It has been proven with lower cost and longer effectiveduration of controlling water,which can greatly increase oil recovery.Results show that the water content in the well of CPI water control is only 10% to 33% of the adjacentwells at the same geological layers.The initial oil water ratio in the CPI well is 13,which is ten times betterthan the adjacent wells.After 2 months'production,the water content of CPI well is 13.3%,compared to67%,62%,and 89% of the adjacent wells.
展开▼
