UNIT FOR CONTROLLED DELIVERY OF BOTTOMHOLE TREATMENT FLUID Russian patent published in 2014 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to tools and a method of the bottomhole treatment fluid delivery to the job site. Essence of the inventions: the unit of the bottomhole treatment fluid delivery to the job site comprises a tubular body for filling the displacement fluid and the bottomhole treatment fluid as a column of the pressure increasing fluid, at that the tubular body is made as a flexible tubing string; an injection valve connected to the end of the above tubular body faced to the bottomhole in order to direct the bottomhole treatment fluid closer to the bottomhole from the displacement fluid; and a back-pressure valve connected to the end of the above injection valve faced to the bottomhole in order to maintain the bottomhole treatment fluid at high pressure before delivery to the job site. At that the back-pressure valve is made so that it excludes premature release of the bottomhole treatment fluid from the unit. The unit can be charged with the bottomhole treatment fluid from the end faced to the bottomhole.

EFFECT: higher efficiency of the method and operating reliability of the device.

21 cl, 7 dwg