SU962585A1 - Apparatus for isolating absorption zones - Google Patents

Description

(54) DEVICE FOR ISOLATION OF ABSORPTION ZONES

The invention relates to the drilling of oil and gas wells, namely the elimination of mud absorption during well drilling in fractured and cavernous rocks.

A device for isolating absorption zones is known, which includes a tank, a column and a pump.

A filler is transported through the column. With the aid of a carrier fluid B, the channels for the maintenance of the washing liquid. The content of the filler in the carrier fluid is only 5 - 1 O%. However, according to the technological requirements, when eliminating catastrophic absorption it is necessary to have a much higher content of the filler. An increase in the concentration of the filler inevitably leads to complications during injection (formation of traffic jams in the drill pipe, packer, failure of pumps, etc.).

Closest to the present invention is a device for isolating absorption zones, including a housing with a size

A packer on it, with a drive mechanism and a movably mounted stem with filling and axial bore holes G2.

A disadvantage of the known device is that with its use the injection of a grouting mixture with a high filler content is hampered due to the danger of plug formation, breakage of pumps, etc., which, in general, reduces

10 efficiency of isolation of absorption zones.

The purpose of the invention is to control the efficiency of isolation of absorption zones due to the possibility of pumping a cement mix with an increased content

"5 filler.

Claims (1)

The goal is achieved in that the device in the lower part is provided with a container in communication with the axial channel of the shaft, which is below the filling holes with upper and lower circulation openings and a partition between them that overlaps the axial channel of the shaft, with an internal annular groove, forming a cavity with the rod for communication of the axial channel of the rod above the partition with the container. FIG. 1 shows the device in the transport position, general view; in fig. 2 - the same in the working position. The device for isolating the absorption zones includes the housing 1 with the packer 2 placed on it, the measles 3 with the mechanism 4 driving it to the operating position. Inside the housing, the rod 5 is mounted with an axial 6 and filling holes 7. The rod 5 in the lower part (below the filling holes) is made with the top 8 and bottom 9 circulation holes and a partition 10 between them, which blocks the axial channel of the stem . The body against the septum is made with an inner annular groove 11, which forms with the stem 5 a cavity for communication of the axial bore of the brush above the partition with the container 12 installed in the lower part of the device and filled with filler 13. The lower part of the container has a diaphragm 14. The device works as follows. After its descent, for example, on drill pipes, a fluid is pumped to a predetermined depth, which through the filling holes 7 of the rod 5 enters the drive mechanism 4 of the core into the working position. Under pressure, the bore 3 engages with the borehole wall. Then the drill pipes are lowered, the casing 1 remains stationary, and the rod 5 moves downwards. The filler holes 7 overlap (shift). At the same time, the upper 8 and lower 9 circulation openings of the scoop appear in the cavity of the annular groove 11 The liquid is squeezed from the surface through the circulating apertures and the cavity enters the container 12 and squeezes the filler out of it, destroying the absorbent mixture and clogs the channels of filtration fluid. The high filler content will provide reliable insulation of the absorbing formation, while reducing the time of the operation, as well as the consumption of materials. The invention The device for isolating absorption zones, comprising a housing with a packer placed on it, measles with its drive mechanism and a stem movably mounted inside the housing with filling holes and an axial channel, characterized in that, in order to increase the efficiency of absorption zones behind account of the possibility of injection of the grouting mixture with the filler content increased in it; it is in the lower part equipped with a container communicated with the axial channel of the rod, which is below the filling holes with the upper and lower and circulation holes and a partition between them, which overlaps the axial channel of the rod, and the housing below the drive mechanism, the core is made with an internal annular groove, forming a cavity with the rod to communicate the axial channel of the rod above the partition with the container. Sources of information taken into account in the examination 1. Instructions for the study and isolation of reservoirs that absorb washing fluid when drilling wells in oil fields of the Tatar ASSR. Bugulma, TatNIPIneft, 1978, p. 3239. 2, USSR Author's Certificate No. 487227, cl. E 21 V 33/13, 1969 (prototype).