RU122432U1 - PACKING DEVICE FOR DEEP WELLS WITH HIGH LAYER PRESSURES - Google Patents

Abstract

A packer device for deep wells with high formation pressure, including a hydraulic packer containing a shaft, a sleeve mounted on the shaft, a cylinder, seals, a lower anchor with a movable wedge and a fixed wedge mounted on the shaft, with spring-loaded rims installed between the movable and fixed wedge wedges, and a valve assembly in the form of a saddle for a ball, fixed on the shaft by means of a bracket and fixed with shear screws, characterized in that the packer device contains an upper anchor with spring-loaded breadcrumbs installed in the cage, with a movable wedge that can fix the cage on it using shear screws, and the sleeve has the ability to be fixed on the shaft using shear screws, and the movable wedge of the lower armature is equipped with spring clips located between it and the cylinder and between it and the sleeve, respectively, and inside the shaft at the location of the fixed wedge of the lower armature, a sleeve is made, in groove of which shear vi screws fixing the sleeve relative to the shaft, and a stopper is installed that prevents the release of the fixed wedge of the lower armature, and an additional shear ring is installed that prevents the release of the fixed wedge of the lower anchor bypassing the stopper, while an elastic ring is installed above the upper anchor to protect its spring-loaded crackers, coupled with a ratchet mechanism, seals are located between the movable wedge of the upper armature and the cylinder, which is mounted on the shaft, and the movable wedge of the lower armature is located between the shaft and the cylinder.

Description

The utility model relates to the oil and gas industry and can be used in any cased hole wells, namely for deep wells with high pressure when operating with aggressive chemical components in the produced fluid.

A hydraulic packer is known, comprising a housing on which upper and lower anchor assemblies are mounted, an elastic elastic sealing element located between the anchor assemblies, a hydraulic actuator made in the form of a cylinder and a piston, a shear valve connected to the lower part of the housing and provided with a landing seat under the dump element, RU No. 2151854 C1, E21B 33/12, 06/27/2000.

A two-arm mechanical packer containing a shaft, upper and lower anchors with spring-loaded dies, gaskets, upper and lower cones, figured groove, RU No. 84052 U1, E21B 33/12, 06/27/2009.

Known hydraulically-installed drillable packer containing a packer device comprising a hollow shaft on which are installed dies, wedges, a seal and in the lower part of which a locking device is installed, and an installation device comprising a hydraulic anchor assembly with a piston and a fixing element, RU No. 844913 U1 E21B 33/12 07/20/2009.

Known packers are not designed to work in deep wells with high reservoir pressure.

A hydraulic packer is known, comprising a shaft, a sleeve mounted on the shaft, a cylinder, seals, an anchor with a movable wedge and a fixed wedge mounted on the shaft, with spring-loaded crackers installed between the movable and fixed wedges, and a valve assembly in the form of a saddle for a ball, fixed on the shaft by means of an arm and fixed with shear screws, RU No. 2235189 C1, E21B 33/12, 08/27/2004.

This technical solution was adopted as the "closest analogue" of this utility model.

The “closest analogue” hydraulic packer is removable, reliable in wells with low reservoir pressure and not suitable for use with aggressive fluids like hydrogen sulfide.

In deep wells, where temperature fluctuations occur during technological operations (injection from the mouth of fluids into the formation), which contribute to shortening the length of the pipes, creating a large axial load on the tension of the pipe string and leading to spontaneous breakdown of the packer, the use of a hydraulic packer “the closest analogue " does not seem possible.

In addition, the presence of aggressive components in the produced fluid and high pressure (during long-term operation of the packer device in the well) destroy the rubber O-rings between the sleeve and the shaft, which reduces the reliability of the packer and it is not possible to use the “closest analog” hydraulic packer in deep wells.

The present utility model is based on the solution of a problem that allows to increase the reliability of the packer device.

The technical result of this utility model consists in the possibility of operating a packer device in deep wells with high reservoir pressure in the presence of chemically aggressive produced fluids, in the implementation of a packer device with a hydraulic packer and valve assembly, in the presence of a hydraulic packer of the upper and lower anchors.

According to a utility model, this problem is solved due to the fact that the packer device for deep wells with high reservoir pressure includes a hydraulic packer containing a shaft, a sleeve mounted on the shaft, a cylinder, seals, a lower anchor with a moving wedge and a fixed wedge mounted on the shaft, with spring-loaded crackers installed between movable and stationary wedges. The packer device includes a valve assembly in the form of a saddle for a ball mounted on a shaft by means of an arm and fixed with shear screws.

The packer device comprises an upper anchor with spring loaded crackers installed in the cage, with a movable wedge having the ability to fix the cage on it using shear screws, and the sleeve has the ability to be fixed on the shaft using shear screws.

The movable wedge of the lower anchor is equipped with spring clips located between it and the cylinder and between it and the sleeve, respectively.

A sleeve is made inside the shaft at the location of the fixed wedge of the lower anchor, in the groove of which shear screws are installed that fix the sleeve relative to the shaft, and a stopper is installed that prevents the release of the fixed wedge of the lower anchor, and an additional shear ring is installed that prevents the release of the fixed wedge of the lower anchor bypassing the stopper.

At the same time, an elastic ring is installed over the upper anchor to protect its spring-loaded crackers, coupled with a ratchet mechanism.

Seals are located between the moving wedge of the upper armature and the cylinder.

The cylinder is mounted on a shaft.

A movable wedge of the lower anchor is located between the shaft and the cylinder.

The applicant has not identified sources containing information about the technical solution that is identical to the characteristics given in the formula of this utility model, this determines, according to the applicant, the utility model meets the criterion of “novelty”.

The essence of the utility model is illustrated by drawings, which depict:

figure 1 - Packer device, section;

figure 2 - Node A in figure 1, a section;

figure 3 - Node B in figure 1, a section;

figure 4 - Node In figure 1, a section.

The packer device comprises a hydraulic packer 1, a valve assembly 2.

Hydraulic packer 1 contains:

Val - 3.

The sleeve (on the shaft 3) - 4,

shear screws (for fixing the sleeve 4 on the shaft 3) - 5.

Cylinder (on shaft 3) - 6.

Lower anchor (packer 1) - 7.

Spring loaded crackers (anchors 7) - 8.

Moving wedge (anchors 7) - 9,

spring clip (between cylinder 6 and wedge 9) - 10,

spring retainer (between sleeve 4 and wedge 9) - 11.

Fixed wedge (on shaft 3) - 12.

The sleeve (inside the shaft 3 at the location of the wedge 12) - 13,

the groove (in the sleeve 13) - 14,

shear screws (in the ditch 14 for fixing the sleeve 13 on the shaft 3) - 15,

stopper (for a wedge 12) - 16,

shear ring (for wedge 12) - 17.

The top anchor (packer 1) is 18.

Cage (for anchor 18 on shaft 3) - 19.

Spring loaded crackers (anchors 18 in cage 19) - 20.

Moving wedge (anchors 18) - 21,

shear screws (for fixing the cell 19 on the wedge 21) - 22.

The elastic ring (above the anchor 18 to protect the crackers 20) - 23,

ratchet mechanism (prevents the "return" of the ring 23) - 24.

Seals (between wedge 21 and cylinder 6) - 25.

Valve assembly 2 includes:

Bracket (on shaft 3) - 26.

Saddle (on bracket 26) - 27,

Ball (for saddle 27) - 28.

The packer device for deep wells with high reservoir pressure includes a hydraulic packer 1 and valve assembly 2.

The hydraulic packer 1 contains a shaft 3, a sleeve 4, a cylinder 6, a lower 7 and an upper 18 anchors, seals 25.

The sleeve 4 is mounted on the shaft 3 with the possibility of fixing on it by means of shear screws 5.

The lower anchor 7 is made with spring-loaded crackers 8, movable 9 and fixed 12 wedges.

The movable wedge 9 is equipped with a spring clip 10 located between it and the cylinder 6, and a spring clip 11 located between it and the sleeve 4 (figure 3).

A movable wedge 9 is located between the shaft 3 and the cylinder 6.

Fixed wedge 12 is mounted on shaft 3.

Inside the shaft 3, at the location of the fixed wedge 12, a sleeve 13 is made, in the groove 14 of which there are shear screws 15 that fix the sleeve 13 relative to the shaft 3, and a stopper 16 is installed that prevents the release of the stationary wedge 12, and an additional shear ring 17 is installed that prevents the release of the fixed wedge 12 bypassing the stopper 16 (figure 4).

Spring-loaded crackers 8 are installed between the movable 9 and the stationary 12 wedges.

The upper anchor 18 is made with spring-loaded crackers 20 and a movable wedge 21.

Spring-loaded crackers 20 are installed in the cage 19. The movable wedge 21 has the ability to fix the cage 19 on it using shear screws 22.

Seals 25 are located between the moving wedge 21 of the upper armature 18 and the cylinder 6.

Cylinder 6 is mounted on shaft 3.

Above the upper armature 18, an elastic ring 23 is installed to protect its spring-loaded crackers 20. The elastic ring 23 is coupled to a ratchet mechanism 24, which prevents the "return" of the ring 23 (figure 2).

The valve assembly 2 is made in the form of a seat 27 for the ball 28, mounted on the shaft 3 by means of an arm 26 and fixed with shear screws.

Work with a packer device as follows.

After lowering the packer device to the required depth, throw the ball 28 into the pipe string, which falls into the saddle 27, after which fluid is supplied to the pipes.

Under the action of the fluid supplied to the pipes, the movable wedge 9 of the lower armature 7 moves toward the fixed wedge 12 of the lower armature 7 and presses the spring loaded crackers 8 against the wall of the production casing pipe.

When the spring-loaded crackers 8 of the lower armature 7 are fixed on the wall of the production casing, the movement of the movable wedge 9 of the lower armature 7 will stop, but the movement of the cylinder 6 together with the seals 25 and the movable wedge 21 of the upper armature 18 along the shaft 3 towards the elastic ring 23 will begin, which will deform , seals the gap between the hydraulic packer 1 and the wall of the production string and will protect the spring-loaded crackers 20 of the upper armature 18 from mechanical impurities.

Further movement of the cylinder 6 together with the seals 25 and the moving wedge 21 of the upper armature 18 will lead to the shear screws 22 being cut off and the spring wedges 20 being pressed by the moving wedge 21 into the pipe wall of the production casing.

At the moment between the cutoff of the screws 22 and the movable wedge 22 touching the upper anchor 18 of the spring loaded crackers 20, the ratchet mechanism 24 prevents the elastic ring 23 from “giving up”, thereby preventing decompression at this moment. After this, deformation of the seals 25 will occur, which will seal the gap between the hydraulic packer 1 and the wall of the production string.

With the end of the packing, at the same time, the cylinder 6 is fixed relative to the movable wedge 9 of the lower armature 7 with a spring clip 10 and the movable wedge 9 of the lower armature 7 is fixed to the sleeve 4 by the spring clamp 11. With continued increase in fluid pressure, the seat 27 on the bracket 26 and the seat 27 are cut together with a ball 28 falls on the bottom of the well.

The packer device is installed and ready to go.

At the same time, the elastic ring 23 closes the gap between the packer device and the well, preventing the possibility of deposition of mechanical impurities on the spring loaded crackers 20 of the upper armature 18, which increases the reliability of their operation in case of failure.

Sealers 25 simultaneously seal both the shaft 3 and the wall of the production casing of the well, isolating the over-packer space from the bottom of the well, and thereby increasing the reliability of the seal by increasing the area of the seal of the shaft 3 with the creation of a preliminary compression of the seals 25.

If the axial load that allows you to cut the screws 5 is exceeded, there will be no disruption of the packer device, since the shear ring 17, designed for a much larger force, will not allow this, which also increases the reliability of the packer device.

In addition, during the operation of the packer device, spring-loaded crackers 8 of the lower anchor 7 hold the shaft 3 of the packer device against the loads acting on it — the pressure of the produced fluid, the weight of the pipe tubing, the tension of the tubing. Spring loaded crackers 20 of the upper packer 18 take the load from the fluid pressure on the seals 25, and this significantly reduces the load on the shaft 3, increasing the reliability of the packer device at high reservoir pressures.

The raising of the packer device is carried out by a special tool (not shown), the task of which is to capture the sleeve 13, cut the screws 15 and move the sleeve 13 up along the axis of the shaft 3. After that, pulling the pipe string, the shaft 3 moves and the screws 5 are cut off on the sleeve 4. 3 moves to the stop of the shear ring 17 into a fixed wedge 12 of the lower armature 7.

The shear ring 17 is not cut off, but is displaced and pushes the stoppers 16 into the free space of the sleeve 13, making it possible to further move the shaft 3 to unpack the packer device.

Further tension of the shaft 3 ensures that the sleeve 4 is disengaged from the fixed wedge 12 of the lower armature 7, the spring-loaded crackers 20 of the upper armature 18 are subsequently released from the action of the movable wedge 21 of the upper arm 18, the seals 25 are released, and then the fixed wedge 12 of the lower arm is displaced 7, releasing spring-loaded crackers 8 of the lower anchor 7.

The packer device is raised.

In the case when it was not possible, for some reason, to move the sleeve 13 to allow the stoppers 16 to allow axial movement of the shear ring 17, the lifting of the packer device can be carried out in an emergency way - by tightening the shaft 3 with an force exceeding the strength of the shear ring 17, which one it was originally selected.

In this case, the screws 5 are first cut off, freeing the shaft 3 relative to the sleeve 4. However, with further tension of the pipes, the shaft 3 moves only to the stop of the fixed wedge 12 of the lower armature 7 in the shear ring 17 on the shaft 3, which does not lead to unpacking.

Then, when tensioning the pipes on which the packer device descended with a force much greater than that which was enough to cut the screws 5, but sufficient to cut off the ring 17, the shear ring 17 is cut off and releases the shaft 3 relative to the fixed wedge 12 of the lower armature 7.

The further process of lifting the packer device repeats the regular method of lifting after releasing the shaft 3 relative to the fixed wedge 12 of the lower armature 7 and the sleeve 4.

The difficulty in working in deep wells with high reservoir pressure or in wells with large temperature changes in the elevator without a heat compensator lies in large axial loads, both towards the bottom and towards the mouth.

The presence of the sleeve 13, interacting with the stoppers 16 and the shear ring 17 and preventing the release of the shaft 3 relative to the stationary wedge 12 of the lower armature 7, significantly increases reliability, because allows you to perceive large axial loads on the shaft 3 of the packer device in the direction from the bottom to the mouth.

The presence of a spring clip 11 increases reliability with axial loads on the shaft 3 from the mouth to the bottom, because when the load on the shaft 3 from the mouth to the bottom, with the help of a spring retainer 11 there is an even greater indentation of the spring-loaded crackers 8 of the lower armature 7 into the production casing pipe.

The presence of spring loaded crackers 20 of the upper armature 18 and an elastic ring 23, which protects the spring loaded crackers 20 from mechanical impurities, increases reliability since protects the seals 25 from axial loads and prevents the gap from softening between the hydraulic packer 1 and the production string. And the presence of a ratchet mechanism 24 prevents the softening of the elastic ring 23 at the time of cutting the screws 22 when installing the packer device in the well.

The design of the packer device, in which the seals 25 are located directly on the shaft 3, with the sleeve 4 mounted on the shaft 3, when there is no need to use rubber sealing rings over the seals 25, increases the reliability of the packer 1, because there is no interaction of rubber o-rings with an aggressive environment.

The proposed packer device includes components and parts that are widely used in the oil and gas industry, and pilot testing determines, according to the applicant, its compliance with the criterion of "industrial applicability".

Claims (1)

A packer device for deep wells with high reservoir pressure, including a hydraulic packer containing a shaft, a sleeve mounted on the shaft, a cylinder, seals, a lower anchor with a movable wedge and a fixed wedge mounted on the shaft, with spring-loaded crackers installed between the movable and the fixed wedges, and a valve assembly in the form of a saddle for a ball mounted on a shaft by means of an arm and fixed with shear screws, characterized in that the packer device comprises an upper arm with a spring it is installed in the cage with a movable wedge having the ability to fix the cage on it using shear screws, and the sleeve has the ability to be fixed on the shaft with shear screws, and the movable wedge of the lower armature is equipped with spring clips located between it and the cylinder and between sleeve and sleeve, respectively, and inside the shaft at the location of the fixed wedge of the lower anchor, a sleeve is made, in the groove of which shear screws are installed that fix the sleeve relative to the shaft, and a stopper is installed that prevents the motion of the fixed wedge of the lower anchor, and an additional shear ring is installed that prevents the release of the fixed wedge of the lower anchor bypassing the stopper, while an elastic ring is installed above the upper arm to protect its spring-loaded crackers, coupled with a ratchet mechanism, seals are located between the movable wedge of the upper arm and the cylinder, which is mounted on the shaft, and the movable wedge of the lower anchor is located between the shaft and the cylinder.