SU1502808A1 - Hydromechanical packer - Google Patents

Abstract

The invention relates to the oil industry and can be used in injection wells. The goal is to increase the reliability of the packer at high pressure drops between the sub-packer and above-packer spaces of the well. For this, the housing of the packer 10 is rigidly connected to the upper sub 4 and forms with the barrel 2 an annular axial channel 24, and the upper annular piston 11 is also rigidly connected to the housing 10. The latter and the sub 4 have radial channels 25 and 26. The packer has an upper working chamber 18, which is isolated from the space under the sealing element 7 in its operating position. The piston 17 is mounted on the barrel 2 and is rigidly connected with the lower cylinder 16 placed on the lower annular piston 6 with the possibility of axial displacement relative to it. The piston 6 is rigidly connected to the barrel 2. With increasing pressure of the injected fluid in the tubing string 1 and the sub-packer space, the piston 17 senses the upward pressure drop, the force from which is transmitted to the casing. The piston 6 does not experience force from the pressure drop, and the piston 11 experiences an increased pressure drop from top to bottom. This leads to an increase in additional effort from the differential, contributing to the reliability of its installation in the well. 1 hp f-ly, 1 ill.

Description

k

sl o to

00

About 00

KS i radienne channels 23 and 2b. Aker Imgett upper working chamber, 1B, which was insulated from the space under the sealing element 7 in its working position. The piston 17 is mounted on the barrel 2 and is connected rigidly with the lower cylinder 16 placed on the lower annular piston 6 with the possibility of axial displacement relative to it. The piston 6 is rigidly connected with the barrel 2. With an increase in the pressure of the injected fluid in the pipe string 1 and the subpacker

In the open space, the piston / senses the pressure regrgt directed upward, the force from which is transmitted to the casing. The piston 6 does not experience a force from the pressure drop, and the piston 11 experiences an increased pressure drop from top to bottom. This leads to an increase in additional effort from the differential, contributing to the reliability of its installation in the well. 1 3.p. f-ly, 1 ill.

The invention relates to oil production, in particular to packers used in injection wells.

The purpose of the invention is to increase the reliability of the operation of the pressure plate at high pressure drops between the sub-packer and above-packer spaces of the well.

Pa drawing shows the packer in the initial position.

The hydromechanical packer contains a hollow shaft 2 connected to the column pipe 1 with radial channels 3, upper 4 and lower 5 subs and a lower annular piston 6 placed on it, a sealing element 7 with metal 8 and nonmetallic 9 protective supports mounted on the wall 2 of the housing 10 with an upper annular piston 11, placed on the housing 10 under the sealing element 7, a packer fixation unit with a cone 12, bolts 13 and a pin holder 14, a packer hydraulic drive unit including the upper 15 and lower 16 cylinders, with respect to the barrel 2 and the housing 10, an annular piston 17, rigidly connected to the upper 1st cylinder 15 connected to the slip holder 14 and movably mounted on the upper annular piston 11, the upper working chamber 18 communicating with the well, and the lower working chamber 19 hydraulically connected with the cavity 20 of the barrel 2 through its ram; and channels 3, and the control unit of the packer cage, located in the trunk of the PUL by the hydraulic drive unit and turning on the seat; 1о 21 with the ball 22,

0

five

0

five

0

five

0

five

installed in the lower sub

5 on the shear element 23. The packer housing 10 is rigidly connected to the upper sub 4 and forms an annular axial channel 24 with the barrel 2, the upper annular rim 11 is rigidly connected to the housing 10, in the upper sub 4 and the upper annular piston 11 messages of the upper working chamber 18 with a borehole through them and an annular axial channel 24 between the barrel 2 and the body 10, while the upper working chamber 19 is isolated in the working position of the sealing element 7 from the sub-packer space of the well and hydraulically associated with the nadpaknerny space of the well. The movable annular piston 17 of the hydraulic unit of the packer is mounted on the barrel 2 and is rigidly connected to the lower cylinder

16, which is mounted on the lower annular piston 6 with the possibility of axial movement relative to it, with the lower annular piston

6cb zan with barrel 2 hard. In the initial position, the lower cylinder 16 is secured with a shear pin 27 on the stop 28 of the lower sub 5, and the cone 12 of the fixing unit is mounted on the annular projection 29 of the housing 10. The tightness of the movable joints of the packer hydraulic drive is provided by sealing rings 30 and 31.

Packer works as follows.

Down the packer on the column of pipe 1 into the well. In the pipe string 1, the ball 22 is dropped and the fluid is injected. Fluid under pressure enters

In the lower p, chSm 1st chamber 19 through the radial holes 3 in stol 2 and reacts on the piston 17 with the cylinder 15. The piston 17 through the cylinder 15 acts on the slip holder 14 and the slips 13. In this case, the lower cylinder 16 cuts the pin 27 and moves with the piston 17 up. The slips 13, moving along the cone 12, engage with the wall of the casing string and the packer is fixed in the well. After that, the pipe string 1 is slowly lowered down. Under the force of the weight of the string of pipe 1, the sealing element 7 opens the protective supports 8 and 9, expands to the casing and seals the packer in the well. At the lowest pressure increase in the pipe string 1, the shear element 23 is destroyed and the saddle 21 with the ball 22 falls into the shank of the packer (not shown).

During fluid injection, the pressure in the subpacker space of the well acts on the upper annular piston 11 ° B of the upper working chamber 18 through the channels maintained fluid pressure over the pack. Due to the difference in pressure differential between the sub-packer and supra-wellbore spaces of the well, the upper annular piston 11 acts through the housing 10 and the upper sub 4 on the barrel 2 of the packer. At the same time, the downward additional force from the effect of the pressure drop on the area of the upper annular piston 11 is applied to the sealing element 7 of the packer.

When the pressure of the injected fluid in the string of pipes 1 and the sub-packer space is increased, the piston 17 mounted on the barrel 2 senses the pressure differential directed upwards. The force from this pressure drop from the cylinder 15 through the slip holder 14 and the spikes 13 is transmitted to the casing. The force acting on the sealing element 7 from the bottom up does not change, since the slips are in engagement with the casing. The shapes of their teeth and the angle of inclination of the contact surfaces between the bearings 13-Å by the slip-holder 14 are such that the greater the force on the slips 13 from below, the more they engage with the casing. When this is attached

028П8Л

YyG1 to the barrel, the lower piston 6 is not irc - it tries to force from the overflow of the lilylene, since the pressure at the bottom and top is the same, equal to the pressure of the fluid being completed. Precarious to the housing 10, the upper piston 11 experiences an increased pressure drop directed from above.

(0 down, since the pressure in the upper working chamber 18 remains constant. This leads to an increase in the additional force from the pressure drop, contributing to an increase in the reliability of its installation in the well.

After the completion of the injection of liquid, the column of pipes 1 is pulled out. In this case, the load on the sealing element

2Q 7 and memory supports 8 and 9 are removed and they take on their original shape. The housing 10, acting on the cone 12 by the protrusion 29, removes it from under the slips 13, which retract

25 from the casing. Thereafter, the packer is removed and rises to the surface.

0

five

0

five

0

five

Claims (2)

1. Hydromechanical packer containing a hollow barrel connected to a column pipe with radial channels, an upper and lower subs and a lower annular piston placed on it, a sealing element with positive supports above and below it, a housing mounted concentrically on the barrel with an upper annular piston placed on the housing under the sealing element a fixation unit for the packer with a cone, slips and a slip-holder, a hydraulic unit for the packer, including upper and lower shinshry, which is movable relative to the barrel and body The piston is rigidly connected with the upper cylinder connected with the slip holder and movably mounted on the upper annular piston, the upper working chamber and the lower working pistol connected hydraulically to the barrel cavity through its radial channels, and the packer landing control unit located in the barrel under the hydraulic drive unit, characterized in that, in order to increase the reliability of the packer operation at high pressure drops between the sub-packer and nadpakernyi borehole spaces, the housing is rigidly connected to the upper sub and forms an annular axial channel with the barrel, the upper annular piston is rigidly connected to the housing, the upper working chamber and the upper annular piston are separated by radial channels, while the upper working chamber is isolated I from sealing element and hydraulically connected with 15028088 space above the sealing element in its working position. 2. Packer according to claim 1, about tl and h and Yu-. u and with the fact that the movable annular piston is mounted on the barrel and is rigidly connected to the lower cylinder, which is placed on the lower annular piston with the possibility of Q axial movement relative to it, the latter being rigidly connected with the barrel. Compiled by L. Farukshin Editor V. Bugrenkova Tehred L. Oliynyk Proofreader M.Samborska Order 5062/44 Circulation 514 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Subscription