METHOD OF REOPENING PRODUCTIVE FORMATION Russian patent published in 1999 - IPC

Abstract RU 2136873 C1

FIELD: oil and gas production. SUBSTANCE: acid solution is injected through tubing to dissolve magnesium plugs. Packer is set onto tubing and annular space is washed through upper and lower holes of device for surfactant- mediated insulation of formation. Aqueous solution of acid is once more injected into tubing and, after reaction pause, reverse washing is effected. Direct and reverse washings are repeatedly effected in cycling mode. EFFECT: increased washing efficiency and formation opening quality. 3 dwg

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RU 2 136 873 C1

Authors

Volochkov N.S.

Popov A.M.

Nikitenko Ju.N.

Merzljakov V.F.

Dates

1999-09-10—Published

1996-10-11—Filed