METHOD OF INTERVAL TREATMENT OF BOTTOM HOLE ZONE OF HORIZONTAL WELL SHAFT Russian patent published in 2016 - IPC E21B43/16 E21B43/27 E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used in treatment of bottom-hole zone of horizontal boreholes opening carbonate collector. According to the method is determined a pressure of fluid absorption in open horizontal borehole. Performs processing of open horizontal borehole for liquidation of absorption. After treatment at the wellhead collected from bottom to top and is lowered into open horizontal shaft, which consists of a perforated liner with centralizers, the packer, disconnector, the process pipes string. Performs lowering of the packaging arrangement into an open horizontal borehole. Descent of it is lowering up to the lower end of a perforated liner of bottom horizontal borehole. Then inside a perforated liner is lowered a string pump-compressor tubes - PCT and up to 5 m till the lower end of the tubing string PCT of he lower end of a perforated liner lowering of tubing string PCT is stopped. At the wellhead top end of the production string is equipped with casing valve with casing-head stuffing box. Upper end of the process pipe string is equipped with shell valve with stuffing box. On upper end of the tubing pipe PCT tube valve is mounted. Pumped into the casing space invert emulsion until it appears at the wellhead. Casing valve is closed and opened shell and tube valves. Invert emulsion is pumped via the tubing string PCT to shell space until the appearing of inverted emulsion at the wellhead from shell space. Pumping is stopped and closed shell valve. Casing valve is opened. Performs interval treatment of horizontal shaft, which is divided into sections with length at 50 m, starting from the section from bottom hole. For this purpose, at closed casing valve and opened tube and shell valves in tubing string PCT is injected acid composition and flushed it in casing space in a value equal to the volume of the casing space between tubing string PCT and a perforated liner at the length of processed section. Shell valve is closed. Casing valve is opened and with a reverse emulsion launched on the surface, acid composition is forced via the tubing string PCT from casing space between tubing string PCT and perforated liner at the length of processed section to the bottom hole zone of bench along the whole length of processed section. Waiting for response within 12 hours. Invert emulsion is pumped to the tubing string PCT and displaced the reaction products from horizontal shaft in vertical part. Tubing string PCT is moved to the next interval. After processing of all sections of horizontal shaft the tubing string PCT is lowered to bottom. Casing valve is closed and opened shell valve. In the tubing string PCT marketable oil is pumped until it appears at the mouth of the shell space. Then the packer is installed. Disconnector is disconnected and process pipe string removed from the well. Perforated liner is left in the horizontal well bore. Borehole is equipped with well operating equipment and put into operation.

EFFECT: high efficiency of processing.

1 cl, 2 dwg