FIELD: oil and gas industry.;SUBSTANCE: invention relates to the oil industry and is intended for the preventer in the well hydraulic testing. Device for preventer pressing round on well includes support pipe passing through preventer housing, hollow rod installed in supporting pipe and rubber collar arranged on support pipe. From below support pipe is equipped from top to bottom with top and bottom rows of radial channels, and on support pipe is rigidly fixed upper and lower sleeves, between which there is a rubber collar made in the form of a self-sealing collar. Support pipe is equipped with through longitudinal slots, in which pins are installed, which on one side are connected to casing, installed on external surface of housing under lower bushing, and on the other side with hollow rod plugged from above, which is placed inside support pipe, and in initial position hollow rod from above hermetically covers upper row of radial channels of support pipe, and from below hollow rod hydraulically communicates space under support pipe with space above self-sealing collar by through longitudinal channels made in hollow rod opposite lower row of radial channels of support pipe. In initial position, self-sealing collar is located inside jacket, and in working position, casing and hollow rod have the possibility of axial restricted movement along through longitudinal grooves of support pipe until casing stop in external cylindrical projection made on lower end of support pipe. Hollow rod tightly covers the lower row of the radial channels of the support pipe, at that the support pipe is equipped from below with a rigid centralizer equipped with external overflow channels and a spring-loaded casing from below. Outer diameter d1 rigid centralizer is larger than outer diameter d2 of casing accommodating self-sealing collar in initial position, wherein upper end of support pipe is hydraulically connected to pump.;EFFECT: proposed device for preventer pressing round at the well allows improving operating reliability, reducing labor intensity of application, excluding damage to environment during operation of the device and increasing service life.;1 cl, 3 dwg
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