METHOD FOR EXPOSING AND ISOLATION OF RESERVOIRS IN WELL WITH OIL-WATER ZONE Russian patent published in 2007 - IPC E21B43/11 E21B33/13 

FIELD: oil and gas production, particularly perforators and permeators.

SUBSTANCE: method involves lowering casing pipe string 1 having channels located opposite to water-bearing section of productive reservoir 2; cementing hole annuity; injecting solution in water-bearing section of productive reservoir through the channels; closing the channels with gate. Hole annuity between casing pipe string and well wall is cemented with the use of two hollow rigid centrator groups retained in casing pipe string channels. The first rigid centrator 4 group is arranged opposite to water-bearing section of productive reservoir, is filled with plastic material and sealed with gate from inner part thereof along with casing pipe string channel sealing. The second centrator 5 group is opposite to oil-bearing section of productive reservoir 3 and is dilled with acid-soluble material. Before solution injection in water-bearing productive reservoir section gate is opened and implosion action is created. The implosion action results in freeing of hollow centrators and channels of plastic material, cement stone breakage in water-bearing productive reservoir part and cleaning thereof. After solution injection in water-bearing section of productive reservoir acid is injected in productive reservoir section to solve acid-soluble material filling the second centrator group and to open channels thereof. After that well is completed.

EFFECT: increased efficiency.

2 cl, 1 dwg