METHOD FOR ISOLATION OF WATER FLOW IN OPEN HORIZONTAL SECTION PRODUCING WELLS Russian patent published in 2016 - IPC E21B33/13 E21B47/00 E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention finds application in water shutoff in a horizontal or inclined sections of trunks wells. Method of isolation of inflow of water in the open horizontal section of the production well involves extraction from wells pumping equipment, the descent of the pipe string in the well, injecting through them waterproofing solution hardening properties, the creation of an impermeable screen range water-revealing formation and subsequent leaching of waterproofing solution from wells by reverse circulation after initial setting waterproofing compound. After removal from the production well pumping equipment is carried out geophysical survey and determine water-revealing formation interval length in the horizontal section of open hole wellbore. Then openhole horizontal section of the wellbore tubular string is lowered further, the guide funnel fitted on top and the sealing packer. Following additional sealing packer pipe string is equipped with two water-swellable packers length of 1 m each, interconnected by a perforated pipe length equal to the length of the interval water-revealing formation. Inside the tubing for additional perforated pipe installed retainer. Thus after further lowering the pipe string into the open horizontal section of the wellbore and landing sealing packer swellable packers are placed on the interval boundaries water-revealing formation. After waiting swelling packer pipe string lowered into the wellbore. Waterproofing solution is pumped along the pipe string through the holes in the pipe perforation interval water-revealing formation to form a waterproofing screen. After that the injection of the washing liquid with the creation of reverse circulation waterproofing eluted solution from the pipe string more wells. Produce more perforations of the pipe string before and after the interval boundaries water-revealing formation. Then, in the well at the end of the pipe string lowered hydraulic disconnector expandable sleeve and a check valve that passes from the bottom to the wellhead. This expandable sleeve at the ends equipped with sealing rings. Launching process pipe string into the well to carry out the interaction with the expandable sleeve retainer. After that, the process pipe string is pressurized and produce outward radial expansion of the sleeve to seal the end seals further perforated pipe tubing string. Then disconnect the hydraulic isolator produce expandable sleeve by the extraction process and produce a tubing string with a hydraulic disconnect from the well, lowered into the well pumps and run well in a job.

EFFECT: technical result is to increase the reliability and efficiency of the process, improve the quality of waterproofing work, with the exception of watering the horizontal section of the wellbore interval water-revealing formation.

1 cl, 5 dwg