INJECTION WELL REPAIR METHOD
FIELD: oil production, particularly methods or devices for cementing, for plugging holes, crevices, or the like. ^ SUBSTANCE: method involves creating sand bridge within perforation interval. Sand with 0.6-0.8 mm particle dimensions is used and sand bridge is installed up to level spaced at least 1....
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Main Authors | , , , , |
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Format | Patent |
Language | English Russian |
Published |
27.04.2008
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Subjects | |
Online Access | Get full text |
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Summary: | FIELD: oil production, particularly methods or devices for cementing, for plugging holes, crevices, or the like. ^ SUBSTANCE: method involves creating sand bridge within perforation interval. Sand with 0.6-0.8 mm particle dimensions is used and sand bridge is installed up to level spaced at least 1.5 m over perforation interval. Sand is supplied via production string having lower end arranged in well and spaced 30-35 cm over upper level of sand bridge to be created. Then liquid circulation with flow rate of 1.5-2.0 dm3/s via production string is provided. After that sand in amount of 45-55 kg/m3 is poured in production string. Liquid circulation rate is increased to 2.8-3.4 dm3/s along with sand amount increase up to 90-110 kg/m3 for production strings having diameters of 2.5" and up to 140-160 kg/m3 for production strings of 3" diameters. After calculated amount of sand pouring liquid with volume of not less than one production string volume is injected and technological time-delay is carried out for not less than 4 hours to provide sand subsidence. After than liquid circulation in well is recommenced. Finally upper level of sand bridge is determined. ^ EFFECT: increased reliability of perforation interval isolation during remedial cementing. ^ 1 cl, 1 ex |
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Bibliography: | Application Number: RU20070119000 |