METHOD FOR ISOLATING BED WATERS INFLUX IN HORIZONTAL OIL OR GAS WELL Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes pumping of water-isolating composition into watered section of horizontal shaft of well. Sleeveless long-dimensional pipe is lowered into the well to the face. Along said pipe blocking liquid is pumped in amount necessary for filling horizontal portion of well shaft. Blocking liquid is pushed into the well by closing liquid. Then sleeveless long-dimensional pipe is raised above level of blocking liquid and well is filled with closing liquid. After that into sleeveless long-dimensional pipe water-isolating composition is fed, which is transferred to foot of sleeveless long-dimensional pipe. Sleeveless long-dimensional pipe is lowered up to depth of lower section of interval to be isolated. Water-isolating composition is pushed into interval of isolation by means of leaving charge, while speed of filling of isolated interval of horizontal shaft should match the speed of raising of sleeveless long-dimensional pipe. When foot of sleeveless long-dimensional pipe reaches upper section of interval to be isolated, behind-pipe space is sealed and water-isolating composition is pushed into layer by pushing liquid. After that sleeveless long-dimensional pipe is raised higher than blocking pack and well is left for polymerization of components of water-isolating composition under pressure of pumping.

EFFECT: higher effectiveness of isolation of bed waters.

1 dwg, 1 ex