RU2107150C1 - Device for sealing of pipe inner space at lifting pump-compressor string from well under pressure - Google Patents

Abstract

FIELD: oil and gas production industry. SUBSTANCE: this is used in carrying out repair operations at well head without plugging of well. Improved device has body which accommodates sealing member and lock relative to string of pump-compressor pipes. Device is also provided with rod which has axial and radial passages, slots, and sealing member on its side surface. Body is made with axial passage and openings for locks. Locks are seated in slots of rod. Rod is positioned for possible axial displacement relative to body. Sealing member of rod is made for possible creation of space in pump-compressor pipes due to cooperation with sealing member of body, rod, and body itself. EFFECT: higher efficiency. 3 dwg

Description

 The invention is intended for sealing the annulus of the tubing string during repair work at the wellhead without setting.

 A device is known for sealing the tube space when lifting the tubing string under pressure, comprising a housing with a sealing element installed thereon and device latches relative to the tubing string.

 The specified device moves in the tubing string until it is seated on the seat of the fishing clutch. This device cannot be used to search and seal the through holes in the tubing string, which can form at any level along the entire length of the string, since this device can seal the channel only when connected to a fishing clutch. Elsewhere, the entire length of the tubing is not sealed.

 The basis of the invention is the task of improving the device for sealing the annulus when lifting the tubing string from the well under pressure, in which due to structural changes in the housing, by supplying the device with a rod and an additional sealing element, configured to form with the sealing element of the housing, the rod and the body of the cavity in the tubing, provides control of the through holes in the walls of the pipe and sealing tube space in case of damage.

 The problem is solved due to the fact that the device is equipped with a device for sealing the tubing when lifting the tubing string from the well under pressure, containing a housing with a sealing element mounted on it and a retainer relative to the tubing string a rod with an axial and radial channels, grooves and a sealing element on the side surface, and the body is made with an axial channel and windows for clamps that are placed in the grooves of the rod, wherein the rod is placed in the axial channel of the housing with the possibility of axial movement relative to the latter, in the sealing element of the rod is made with the possibility of formation with a sealing element of the housing, the rod and the housing of the cavity in the tubing.

 In the case windows, the clamps are placed when the device is pumped through the pipe in the transport position, the rod is placed in the axial channel of the case, the axial and radial channels of the rod, an additional sealing element of the rod, made with the possibility of formation with a sealing element of the case, the rod and the body of the cavity in the tubing , allow you to stop the device in the pipe if there is a through hole in the pipe wall and seal the in-pipe space.

 In FIG. 1 and 2 show a General view of the device; in FIG. 3 is a cross section of a General view along AA.

 The device comprises a housing 1, on which a sealing element 2, a fixing element 3, a rod 4 are placed.

 The sealing element 5 of the rod is placed on the rod 4 with the possibility of formation with the sealing element 2 of the housing, the rod 4 and the housing 1 of the cavity 6 in the tubing. The locking elements 3 are placed inside the windows 7 of the housing 1. The rod 4 is placed in the axial channel 8 of the housing 1.

 In the rod 4, axial 9 and radial 10 channels are made. Grooves are made on the outer surface of the stem 11. Fixation elements 3 are placed in the grooves 11.

 The device operates as follows.

 When carrying out repair work at the wellhead without filling the well, it is necessary to seal the in-pipe space of pipes having through holes in the walls.

 The device is placed in tubing. Through the axial 9 and radial 10 channels of the rod, the cavity is filled with liquid and pumped through the pipe. When the cavity 6 coincides with the through hole in the wall, the liquid begins to flow through the hole into the annulus, the pressure in the cavity will drop.

 At this moment, under the pressure of the discharge line, the sealing element of the housing 2 starts to move, which moves the housing 1 relative to the rod 4 along the channel 8. The latches 3 in the grooves 11 exit the transport position, moving out of the windows 7, and fix the device inside the tubing. At this point, a pressure jump should be noted on the pressure gauge of the discharge line of the pump unit. Then the pressure in the discharge line is released, the sealing element of the rod 5 is unpacked and seals the tubing. After quality control of the sealing of tubing by the device, the pipes are ready for lifting.

Claims (1)

 A device for sealing the annulus when lifting the tubing string from the well under pressure, comprising a housing with a sealing element installed on it and a retainer relative to the tubing string, characterized in that the apparatus is provided with a rod with axial and radial channels, grooves and a sealing an element on the side surface, and the body is made with an axial channel and windows for retainers that are placed in the grooves of the rod, while the rod is placed in the axial channel of the body with the possibility of axial movement relative to the latter, and the sealing element of the rod is made with the possibility of formation with the sealing element of the housing, the rod and the body of the cavity in the tubing.

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