RU2347062C1 - Packer - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to mechanical engineering and can be used for oil and gas production. Packer includes body, rod, upper and lower switchers, in-body cup and hydraulic cylinder. There is an annular space provided between hydraulic cylinder and rod, and containing a piston. The annular space cavity above the piston is connected to producing string column through the hole formed in the rod. The hydraulic chamber is formed with the hydraulic cylinder and the rod and filled with liquid. Between hydraulic chamber and annular space in the hydraulic cylinder, there is a packing sleeve with a slot used to connect cavity of the hydraulic chamber to the annular space cavity. The slot is stopped with valve arranged in the annular space below the packing sleeve. The valve is supported on the piston mounted below in the annular space and fixed in its initial upper position relative to the hydraulic cylinder with shear screws. The sealing cup is provided on the body between upper and lower protective collars. The upper protective collar is supported on upper switch, and the lower protective collar rests on the hydraulic cylinder through retainer num in-between.

EFFECT: higher downhole performance especially that of several beds with selective processing using number of packers.

1 dwg

Description

The invention relates to mechanical engineering, in particular to pumping units for lifting liquids from wells using tubing of a pumping unit and packer located on a column, and can be used for the extraction of liquid minerals.

A known pump installation containing a downhole jet pump mounted on a tubing string and a packer located below it on a tubing string (see copyright certificate SU No. 17989800, class F04F 5/02, 12/07/1992).

However, this pumping unit can only be used for production from a well of various media from one reservoir, since the annulus can be closed only during the operation of a downhole jet pump, which reduces the functionality of the installation.

A packer is known comprising a barrel, a stem, an upper and a lower sub, a sealing collar and a hydraulic cylinder mounted on the barrel, the last and the rod forming an annular chamber in which a piston is mounted, the cavity of the annular chamber above the piston communicating with the tubing string through stock hole (see patent RU No. 2241114, CL ЕВВ 33/12, 12/20/2003).

The use of this packer makes it possible to close the annulus of the tubing string regardless of the availability of pumping equipment on the tubing string. However, when a liquid or gaseous medium is supplied under pressure through the pipe string, the packer is triggered, which does not allow for pressure testing of equipment located below the packer, for example, the downstream packer, which reduces the functionality of this packer.

Closest to the invention in technical essence and technical result achieved is a packer containing a sealing sleeve and a hydraulic cylinder with an annular chamber in which a piston is installed (see patent RU No. 2140019, class F04D 13/10, 10/20/1999).

In this installation, it is possible to place equipment at a given depth in the well and unpack the packer after installation in the well. However, this packer also does not represent the possibility of carrying out various technological operations by supplying a working medium through the tubing string, since this causes the packer to be unpacked and the annulus of the well blocked by it.

The problem solved by the invention is to enable the supply of tubing pipes of various working or technological environments with the possibility of unpacking the packer regardless of the work carried out in the well.

The technical result achieved by using the invention is to increase the efficiency of work carried out in the well, especially when working in wells with multiple layers and to selectively process them using several packers.

This problem is solved, and the technical result is achieved due to the fact that the packer containing the sealing sleeve and the hydraulic cylinder with an annular chamber in which the piston is installed, including the barrel, rod, upper and lower sub, the sealing sleeve and hydraulic cylinder mounted on the barrel, the last and the rod formed an annular chamber in which the piston is mounted, the cavity of the annular chamber above the piston communicating with the tubing string through the hole made in the rod, with the hydraulic cylinder m and a rod a fluid-filled hydraulic chamber is formed, between the last and the annular chambers in the hydraulic cylinder there is an annular sleeve in which a longitudinal hole is made, by means of which the cavity of the hydraulic chamber is in communication with the cavity of the annular chamber, the longitudinal hole is blocked by a valve installed in the annular chamber below the annular sleeve, the last installed with an emphasis in the piston mounted below it in the annular chamber, fixed relative to the hydraulic cylinder in its initial upper position by shear screws and sealing ring mounted on the stem between upper and lower protective sleeves, the upper protective sleeve is mounted in focus top sub and the lower protective sleeve is mounted in the cylinder through the focusing nut-emphasis placed therebetween.

In the course of the study, it was found that for the effective operation of a well pumping unit, it is necessary to carry out various work in the well to intensify the inflow from the formation and, as often happens, from several layers. For this, it is necessary to install several packers in the well with their sequential pressure testing to organize work on the selective injection of technological fluids into the reservoirs, for example, various kinds of chemicals to increase the permeability of the reservoirs.

The implementation of the packer with two chambers allowed one of the chambers to be used as a hydraulic lock, which does not allow unpacking the packer when it is supplied through the tubing string of various media under pressure, the supply of which only creates the conditions for preparing the packer for unpacking.

As a result, the following are excluded:

- spontaneous landing of the packer during its descent, due to the presence of a hydraulic lock;

- spontaneous unpacking (landing) of the packer during pressure testing below the installed packer, since unpacking the packer is possible only due to the axial movement of the tubing string after the hydraulic lock has been opened (opened).

Since it is possible to adjust the number of shear screws holding the piston of the hydraulic lock of the packer, it is possible to install several packers sequentially on top of each other, which greatly expands the functionality for various operations related to the selective treatment of wellbores.

The drawing shows a longitudinal section of a borehole pumping unit.

The downhole pump installation comprises a pump 2 mounted on a tubing string 1, below which a packer 3 is installed on a tubing string 1, including a barrel 4, a stem 5, an upper 6 and a lower 7 sub, a sealing collar 8 mounted on the barrel 4 and a hydraulic cylinder 9. A rod 5 and a hydraulic cylinder 9 are provided with an annular chamber 10 in which a piston 11 is mounted. The cavity of the annular chamber 10 above the piston 11 is in communication with the tubing string 1 through a hole 12 made in the rod 5. The hydraulic cylinder 9 and the rod 5, a fluid-filled hydraulic chamber 13 is formed. Between the last and the annular chamber 10, an annular sleeve 14 is installed in the hydraulic cylinder 9, in which a longitudinal hole 15 is made, by means of which the cavity of the hydraulic chamber 13 is in communication with the cavity of the annular chamber 10. The longitudinal hole 15 is blocked by the one installed in the annular chamber 10 below the annular sleeve 14 by the valve 16. The latter is installed with a stop in the piston 11 mounted below it in the annular chamber 10, fixed relative to the hydraulic cylinder 9 in its original top position through shear screws 17. The sealing sleeve 8 is mounted on the barrel 4 between the upper 18 and lower 19 protective sleeves. The upper protective sleeve 18 is installed with an emphasis in the upper sub 6, and the lower protective sleeve 19 is installed with an emphasis in the hydraulic cylinder 8 through the stop nut 20 located between them. The movable elements of the packer 3, in particular the rod 5 and the piston 11, are sealed relative to the stationary elements of the packer 3 by means of o-rings 21.

After the descent of the tubing string 1 with pump 2 and packer 3 into the well to a predetermined depth and the lower part of the tubing string 1 resting on the bottom, sleeve, or another packer already set (not shown in the drawing) in the tubing string the compressor pipes 1 creates excess pressure, which provides shear shear screws 17 and the movement of the piston 11 along the rod 5 in the annular chamber 10 until it stops in the lower sub 7. The values of the specified excess pressure are determined by the specific parameters of the well, and tsya by changing the number of shear screws 17.

As a result of the movement of the piston 11, the valve 12 also moves downward, opening the longitudinal hole 15, and the liquid filling the hydraulic chamber 13 begins to flow from the latter through the longitudinal hole 15 into the annular chamber 10. By reducing the amount of fluid in the hydraulic chamber 13, the rod 5 is able to longitudinal movement relative to the hydraulic cylinder 9 and the lower sub 7. The longitudinal movement of the rod 5 and the associated barrel 4 leads to compression of the sealing collar 8. Protective sleeves 18 and 19 provide protection the rubber from flowing out of which the sealing lip 8 is formed in the gap between the parts of the packer 3 (top sub 6 and the nut-stop 20).

The magnitude of the force compressing the sealing sleeve 8 is adjusted due to part of the weight of the tubing string 1, unloaded to the packer 3.

To remove the packer 3, it is sufficient to create an axial force directed upward. This force should only exceed the weight of the tubing string 1 located above the packer 3.

After that, the downhole pumping unit is ready for operation for pumping liquid media from the sub-packer space of the well.

The present invention can be used in the oil and other industries related to the production of liquid media from wells.

Claims (1)

A packer comprising a sealing collar and a cylinder with an annular chamber in which a piston is mounted, characterized in that the packer includes a barrel, a rod, an upper and lower sub, a sealing collar and a hydraulic cylinder mounted on the barrel, the ring chamber in which the ring is installed last and the rod a piston, and the cavity of the annular chamber above the piston is in communication with the tubing string through a hole made in the rod, a hydraulic chamber filled with liquid is formed by the hydraulic cylinder and the rod There is a ring sleeve between the last and the annular chamber in the hydraulic cylinder, in which a longitudinal hole is made, by means of which the cavity of the hydraulic chamber is in communication with the cavity of the annular chamber, the longitudinal hole is blocked by a valve installed in the annular chamber below the annular sleeve, the latter is installed with an emphasis placed below it in the annular chamber, a piston fixed relative to the hydraulic cylinder in its initial upper position by means of shear screws, and the sealing sleeve installed in the barrel between the upper and lower protective sleeves, the upper protective sleeve is mounted in focus top sub and the lower protective sleeve is mounted in the cylinder through the focusing nut-emphasis placed therebetween.