SU1573139A1 - Double packer for insolation of borehole intervals under test - Google Patents

Abstract

The invention relates to engineering and geological surveys and allows to increase the efficiency of the packer by providing the opportunity to test two well intervals without rearranging the packer. It contains a hollow body (PC) with radial holes 1, made up of the upper 2 and lower 3 parts connected by a coupling 4. Above and below the holes 1 on the PC are placed the upper 10 and lower 13 sealing elements with stop rings 11, 12, 14, 15, the pushers 7 in the form of coil springs, the top 5 and bottom 6 jack nuts, stops 16 and 18, and spring centralizers 8 and 9. The free ends of the spring of the centralizer 8 are placed between the free ends of the springs of the centralizer 9, they interact with each other and with the conical outer surfaces mi couplings 4, providing your amp Goes back to the wall of the well and relatively neprovorot PC. Placed in the PC are upper 22 and lower 23 partitions with central holes, in which axially displaced lower end and radial holes 21 in the lower part are placed with the possibility of axial movement of the spring-loaded and secured against rotation of the PC. During rotation of the PT 20, and through it the PC, the nuts 5, 6 synchronously move along the PC, moving away from one another and through the pushers 7 and the thrust rings transmit the axial force to the elements 10, 13, which cover the gap between the PC and the walls 28 of the well. By moving the PT 20 up or down with a string of drill pipe and injecting fluid or gas into the string, test the well spacing below the double packer or between packers. To remove the packer, the PTs 20 are rotated in the opposite direction. 1 il.

Description

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The PC houses the top 10 and bottom 13 sealing elements with stop rings 11, 12, 14, 15, tappets 7 in the form of cylindrical springs, top 5 and bottom 6 jack nuts, stops 16 and 18 and spring centralizers 8 and 9. Free ends of the centralizer springs 8 are placed between the free ends of the springs of the centralizer 9, they interact with each other and with the conical outer surfaces of the coupling 4, ensuring their enhanced pressing to the wellbore and non-turning on the PC. There are in-PC upper 22 and 23 lower partitions with central HIJIMH holes in which the spring-loaded and fixed-positioned axially displaceable

cranking relative to the PC drive pipe (PT) 20 with the lower end plugged out and the radial holes 21

in the lower part. During rotation of the PT 20, and through it, the PC nuts 5, 6 synchronously move along the PC, moving away from one another, and through the pushers 7 and the stop rings transmit axial force to the elements 10, 13, which cover the gap between the PC and the walls 28 of the well. By moving the PT 20 up or down with a string of drill pipe and injecting fluid or gas into the string, test well intervals below a double packer or between packers. To remove the pack, the PT 20 is rotated in the opposite direction. 1 il.

The invention relates to engineering and geological surveys, namely, devices for isolating test wells at intervals during the production of fluid or gas injection and rocks.

The purpose of the invention is to increase the efficiency of the packer by providing the opportunity to test the two well intervals without reinstalling the packer.

The drawing shows a double pack (on the left side - in the initial position, on the right side - in the working position), a section.

The packer contains a hollow body with radial holes 1 composed of two parts — the top 2 and bottom 3, connected by a sleeve 4 with conical outer surfaces. On the body above and below the radial holes 1 are installed on the threads of opposite direction of the upper 5 and lower 6 jack nuts with pushers 7 in the form of cylindrical springs. On jacking nuts 5 and 6, centralizers 8 and 9 are fixed with their free ends, arcuate springs directed towards each other, the springs of the upper centralizer being placed between the springs of the lower centralizer 9 with the possibility of their free ends interacting with each other and with the clutch 4, which does not allow unscrew the nuts 5 and 6 against one another

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more than a fraction of the turnover. The packer also contains an upper sealing element 10 placed between the retaining rings 11 and 12, and a lower sealing element 13 placed between the retaining rings 14 and 15, between the abutment 16 fixed on the upper part 2 of the housing and the retaining ring 11 placed the bearing 17, and between the stop 18 on the lower part 3 of the housing and the thrust ring 15 is a thrust bearing 19.

In the hollow body, concentric with it, a drive tube 20 is placed with a closed lower end and radial holes 21 in the lower part and a partition with a central hole for accommodating the drive pipe 20 - the upper 22 and lower 23. The drive tube 20 is fixed against rotation relative to the upper part 2 housing with fingers 24, rigidly connected with the drive tube 20 and placed in the longitudinal grooves 25 of the upper part 2 of the housing. The drive pipe 20 is spring-loaded relative to the upper part 2 of the housing with a spring 26. In the lower part 3 of the housing there are additional radial holes 27.

Packer works as follows.

A packer on a string of drill pipes that can be reversed is lowered into the well to a predetermined depth, with the centralizers 8 and 9 in contact with the walls 28 of the well, and their free ends are on the outer surface

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the upper 2 and lower 3 parts of the housing, the jack nuts 5 and 6 are as close as possible to each other, the springs 7 are expanded, and the sealing elements 10 and 13 do not touch the walls 28 of the well.

Having reached a predetermined depth, rotate the drive pipe 20 and (through the fingers 24) the body in the direction that provides the movement of the jack nut 5 up and the nut 6 down. If at the same time, at the level of the springs of the centralizer of one of the nuts, there is a cavity and the nut, due to insufficient pressing of the springs, begins to turn, then when the springs touch it,

To remove the packer from its position, the drive pipe 20, and through it the housing, is rotated in the opposite direction. In this case, the jack nuts 5 and 6 move one towards the other, moving the springs of the centralizers 8 and 9 from the coupling 4 and relieving the axial force from the sealing elements, which return to the initial position. After that, the packer is moved to the next depth or removed from the well.

Claims (1)

Invention Formula 15 A double packer for isolating the test intervals of a well, comprising a hollow body with radial holes of two parts connected between one another, begins synchronously with a sleeve with a tapered outer reel with the springs of the other centralizer, the turn of the nut is stopped. Both nuts, braked from turning one This axial movement along the body is removed one from the other and the compression pushers 7 in the form of cylindrical springs. The force from the pushers is transmitted to the sealing elements 10 and 13, which, under the influence of this force, increase in diameter and cover the gap between the packer body and the borehole wall (the right part of the drawing). When moving the jack nuts 5 and 6 from each other, the springs of the centralizers 8 and 9 move towards the conical sections of the outer surface of the coupling 4 and are pressed in the radial direction, increasing their grip with 25 thirty surfaces mounted on the body above and below the radial holes on the threads of the opposite direction of the upper and lower jacking nuts with pushers in the form of cylindrical springs, fixed on the centralizer nuts with their free ends facing arcuate springs, sealing elements with retaining rings and times - fixed stops at the upper and lower ends of the casing, bearings with bearings, characterized in that, in order to increase the efficiency of the packer by 40 the borehole wall during deformation of the seal- the possibility of testing two interfering elements of the packer. Attach the drill string, set the drive pipe 20 to the lowest position, and pump fluid or gas through the drill string, the central channel of the drive tube, radial holes 21 in it and radial holes 27 in the lower part 3 of the case experience the well interval below the double packer, Flow into the drill string, transfer the drive pipe 20 to the extreme - upper position and, inject fluid or gas through the drill string, the central channel of the drive tube, radial holes 21 in it and radial holes 1 in the upper 2 and lower 3 parts of the body , experience a well interval between the top 10 and bottom 13 sealing elements. It is equipped with a drive tube and two baffles, the drive tube is placed concentrically in the housing with the possibility of axial movement, fixed against rotation and spring-loaded relative to it, and the baffles are installed in the housing and made with central holes for placing the drive tube , the lower end of the drive pipe is plugged and radial holes are made in its lower part with the possibility of their alternate communication with the spaces between the sealing elements and under the bottom abutment, with additional radial holes in the housing under the lower partition for communicating the subpacker space with the drive tube. 50 55 To remove the packer from its position, the drive pipe 20, and through it the housing, is rotated in the opposite direction. In this case, the jack nuts 5 and 6 move one towards the other, moving the springs of the centralizers 8 and 9 from the coupling 4 and relieving the axial force from the sealing elements, which return to the initial position. After that, the packer is moved to the next depth or removed from the well. Invention Formula 15  20 surfaces mounted on the body above and below the radial holes on the threads of the opposite direction of the upper and lower jacking nuts with pushers in the form of cylindrical springs, fixed on the centralizer nuts with their free ends facing arcuate springs, sealing elements with retaining rings and times - fixed stops at the upper and lower ends of the casing, bearings with bearings, characterized in that, in order to increase the efficiency of the packer by the possibility of testing two intervals the possibility of testing two intervals It is equipped with a drive tube and two baffles, the drive tube is placed concentrically in the housing with the possibility of axial movement, fixed against rotation and spring-loaded relative to it, and the baffles are installed in the housing and made with central holes for accommodating the drive tube, moreover, the lower end of the drive tube is plugged and in its lower part there are radial holes with the possibility of their alternate communication with the spaces between the sealing elements and under the bottom stop, with additional radial holes in the housing under the bottom partition for communication of the sub-packer space with the drive tube.