CN219795209U

CN219795209U - Self-checking packer

Info

Publication number: CN219795209U
Application number: CN202321116974.7U
Authority: CN
Inventors: 王元正; 赵江鹏
Original assignee: Sichuan Jiemeisi Energy Technology Co ltd
Current assignee: Sichuan Jiemeisi Energy Technology Co ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-10-03
Anticipated expiration: 2033-05-11

Abstract

The utility model provides a self-checking packer, and relates to the technical field of petroleum exploitation equipment. The device comprises an upper mandrel sleeve, an upper sleeve, a rubber cylinder group, a first sleeve ring and a second sleeve ring, wherein the upper sleeve is sleeved with the upper mandrel sleeve; the central shaft is provided with a seal testing pressure transmission channel for communicating the outer shaft sleeve and the seal testing ball seat; the lower end of the upper shaft sleeve is sleeved with a second sleeve ring, the lower mandrel is also sleeved with a third sleeve ring and a lower shaft sleeve, and the upper end of the third sleeve ring extends into the outer shaft sleeve; the lower shaft sleeve is provided with a lower rubber cylinder group; forming a lower bypass passage between the lower end of the outer sleeve and the upper end of the third collar and the lower spindle; the lower end of the lower spindle extends through the interior of the locking assembly. By adding the bypass channel between the two groups of rubber cylinder mandrels and the central tube, the problems that the lower packer cannot be subjected to seal inspection and the sealing performance of the rubber cylinder cannot be judged in the prior art are solved, and therefore the pressure balance and smooth unsealing of the rubber cylinder are facilitated.

Description

Self-checking packer

Technical Field

The utility model relates to the technical field of petroleum exploitation equipment, in particular to a self-checking packer.

Background

Petroleum refers to gaseous, liquid and solid hydrocarbon mixtures, having natural production. Petroleum is also divided into crude oil, natural gas liquids, natural tar, etc., but "petroleum" is conventionally used as the definition of "crude oil". Crude oil is petroleum which is buried in rock stratum and is extracted, the original physical and chemical forms of the crude oil are maintained, and the crude oil can be used by extraction and refining methods.

During oil recovery, it is often necessary to perform workover or testing at different depths or locations, or to replace downhole equipment and tubing. These operations require reliable plugging downhole to prevent problems such as fluid leakage or borehole wall collapse that could otherwise lead to serious safety hazards and loss of production. Therefore, the packer is used as an underground drilling tool, can realize temporary and controllable packing and plays a very key role in construction, maintenance and test processes. The packer can form reliable temporary seal under the well by a system formed by the sealing devices, so that the operation is safer and more effective. Meanwhile, in the production process, the packer can also be used for adjusting the pressure in the well, controlling the flow and developing in layers, so that the oil extraction rate and the production benefit are improved.

Although there are many types of packers, such as RTTS packers, there are some drawbacks in use, for example, the characteristics of deep reservoir burial, multiple layers, high temperature, high mineralization of groundwater, etc. are common in the field of the tariff basin in our country. The oil field casing pipe developed in early stage is extremely severely corroded, a plurality of perforated holes and long-distance leakage well sections need to be plugged, hole repairing and layer changing measures adopted by underground operation are also needed to plug the original production well sections, the common measures are that mechanical or hydraulic double-seal pipe columns are adopted for blocking, but due to the structural characteristics of tools, part of mechanical double-seal pipe columns cannot be used for checking and sealing lower-layer packers, and the plugging effect cannot be determined; furthermore, due to the fact that the structural design of the partial hydraulic self-sealing packer is insufficient, the site operability is lacking, whether the sealing channel is normally opened cannot be judged, and the sealing performance of the rubber cylinder cannot be judged. Therefore, in combination with the field needs and the improvement and innovation of the existing tools, a novel mechanical self-checking packer matching tubular column needs to be developed.

Disclosure of Invention

The utility model aims to provide a self-checking packer, which can solve the problem that the sealing performance of a rubber cylinder cannot be judged in the prior art by aiming at the defects of the prior art, so that the pressure balance and smooth deblocking of the rubber cylinder are convenient.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a self-checking packer comprises an upper joint, an upper mandrel, an outer shaft sleeve, a central shaft, a lower mandrel, a locking assembly and a lower joint which are sequentially connected and form a channel; the upper end and the lower end of the outer shaft sleeve extend to the outside of the upper mandrel and the outside of the lower mandrel respectively;

the upper mandrel is sleeved with an upper shaft sleeve, an upper rubber sleeve group is sleeved outside the upper shaft sleeve, a first sleeve ring is sleeved between the upper joint and the upper shaft sleeve, and a bypass hole is formed in the first sleeve ring;

the upper mandrel and the inside of the central shaft are provided with seal checking ball seats at positions corresponding to the outer shaft sleeve; the central shaft is provided with a seal-checking pressure-transmitting channel for communicating the outer sleeve and the seal-checking ball seat;

the lower end of the upper shaft sleeve is sleeved with a second sleeve ring, wherein the lower end of the second sleeve ring is sleeved with the upper end of the outer shaft sleeve;

the lower mandrel is also sleeved with a third sleeve ring and a lower shaft sleeve, and the upper end of the third sleeve ring extends into the upper end of the outer shaft sleeve; a lower rubber cylinder group is sleeved on the lower shaft sleeve; wherein a lower bypass channel is also formed between the lower end of the outer sleeve and the upper end of the third collar and the lower mandrel;

the lower end of the lower spindle extends through the interior of the locking assembly.

Further, in the utility model, the seal inspection ball seat is a split ball seat, a split claw head is arranged in the seal inspection ball seat, and a groove for adapting to the split claw head is arranged on the inner wall of the seal inspection ball seat.

Further, in the utility model, the sizing cylinder group is provided with two sizing cylinders, and a spacing ring is arranged in the middle of the sizing cylinders.

Further, in the utility model, the lower rubber cylinder group is provided with two lower rubber cylinders, and a spacing ring is arranged in the middle of the lower rubber cylinders.

Further, in the present utility model, the lower spindle includes a first lower spindle and a second lower spindle, wherein an end of the second lower spindle is sleeved on an end of the first lower spindle;

the locking assembly is sleeved on the first lower mandrel and the second lower mandrel; the lower joint is located at an end of the second lower spindle.

Further, in the present utility model, the above-described locking assembly includes: slip cone, slip pin, slip ring, friction block, leaf spring, bolt, retainer and sheath;

the inclined surface of the slip cone is at least partially positioned at the lower end of the slip pin, and the end part of the slip pin is connected with the slip ring in an embedded manner through the slip;

the slip ring is sleeved at the connecting position of the first lower mandrel and the second lower mandrel; the second lower mandrel is sleeved with a friction block, and a plate spring is arranged between the friction block and the second lower mandrel; the first end of the friction block is connected with the slip ring, and the second end of the friction block is connected with the sheath through the bolt and the retainer.

Further, in the present utility model, the self-checking packer has an outer diameter of 7 inches and a length of 2458mm.

In the utility model, the inner diameter of the seal inspection ball seat is 35-55 mm, and the ball throwing diameter is 38mm.

The utility model has at least the following advantages or beneficial effects:

an upper joint, an upper mandrel, an outer shaft sleeve, a central shaft, a lower mandrel, a locking assembly and a lower joint which are sequentially connected and form a channel; the upper end and the lower end of the outer shaft sleeve extend to the outside of the upper mandrel and the outside of the lower mandrel respectively; the upper mandrel is sleeved with an upper shaft sleeve, an upper rubber sleeve group is sleeved outside the upper shaft sleeve, a first sleeve ring is sleeved between the upper joint and the upper shaft sleeve, and a bypass hole is formed in the first sleeve ring; the upper mandrel and the inside of the central shaft are provided with seal checking ball seats at positions corresponding to the outer shaft sleeve; the central shaft is provided with a seal-checking pressure-transmitting channel for communicating the outer sleeve and the seal-checking ball seat; the lower end of the upper shaft sleeve is sleeved with a second sleeve ring, wherein the lower end of the second sleeve ring is sleeved with the upper end of the outer shaft sleeve; the lower mandrel is also sleeved with a third sleeve ring and a lower shaft sleeve, and the upper end of the third sleeve ring extends into the upper end of the outer shaft sleeve; a lower rubber cylinder group is sleeved on the lower shaft sleeve; wherein a lower bypass channel is also formed between the lower end of the outer sleeve and the upper end of the third collar and the lower mandrel; the lower end of the lower spindle extends through the interior of the locking assembly. Through having increased the bypass passageway between two sets of packing element dabbers and the center tube, the passageway is in open state before going into the well, and packing element dabber ascending channel is closed when setting, can open the passageway again when deblocking, has solved among the prior art and can't judge whether examine to seal the passageway and normally open, just can't judge the sealing performance of packing element and can't examine the problem of sealing to packer down yet to make things convenient for packing element pressure balance and deblocking smoothly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a self-checking packer according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a part of the structure of the portion A in FIG. 1;

FIG. 3 is a schematic view of a part of the structure of the portion B in FIG. 1;

FIG. 4 is a schematic view of the part C of FIG. 1;

fig. 5 is a schematic view of a portion of the locking assembly of fig. 1.

Icon: 101-upper joint, 102-first collar, 103-bypass hole, 104-upper mandrel, 105-upper collar, 106-upper packing set, 107-second collar, 108-seal testing ball seat, 109-central shaft, 110-spacer, 111-outer collar, 112-seal testing pressure transmission channel, 113-lower bypass channel, 114-lower packing set, 115-first lower mandrel, 116-locking assembly, 117-lower joint, 118-slip cone, 119-lower collar, 120-third collar, 121-second lower mandrel, 122-slip pin, 123-slip, 124-slip ring, 125-friction block, 126-leaf spring, 127-bolt, 128-retainer, 129-jacket.

Detailed Description

In order that the manner in which the above recited objects, features and advantages of the present utility model are obtained will become more readily apparent, a more particular description of the utility model briefly described above will be rendered by reference to the appended drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1 to 4, fig. 1 shows that this embodiment provides a self-checking packer, which includes: an upper fitting 101, an upper mandrel 104, an outer hub 111, a central shaft 109, a lower mandrel, a locking assembly 116, and a lower fitting 117 that are connected and form a passageway in sequence; and the upper and lower ends of the outer hub 111 extend to the exterior of the upper and lower mandrels 104, respectively; the upper mandrel is sleeved with an upper shaft sleeve 105, an upper rubber sleeve group 106 is sleeved outside the upper shaft sleeve 105, a first sleeve ring 102 is sleeved between the upper joint 101 and the upper shaft sleeve 105, and a bypass hole 103 is formed in the first sleeve ring 102; a seal checking ball seat 108 is arranged in the upper mandrel 104 and the central shaft 109 and corresponds to the position sleeved with the outer sleeve 111; the central shaft 109 is provided with a seal testing pressure transmission channel 112 for communicating the outer sleeve 111 and the seal testing ball seat 108; the lower end of the upper shaft sleeve 105 is sleeved with a second sleeve ring 107, wherein the lower end of the second sleeve ring 107 is sleeved with the upper end of the outer shaft sleeve 111; the lower spindle is further sleeved with a third collar 120 and a lower shaft sleeve 119, and the upper end of the third collar 120 extends into the upper end of the outer shaft sleeve 111; the lower shaft sleeve 119 is sleeved with a lower rubber cylinder group 114; wherein a lower bypass channel 113 is further formed between the lower end of the outer sleeve 111 and the upper end of the third collar 120 and the lower spindle; the lower end of the lower spindle extends through the interior of the locking assembly 116.

In the embodiment, the self-checking packer is in a mechanical setting mode, the structural principle is similar to that of an RTTS packer, the operation is simple, the self-checking function is realized through the ball throwing of the self-checking ball seat 108, and the problem is solved; by adding the bypass channel between the two groups of rubber cylinder mandrels and the central tube, the lower front channel is in an open state, the upper channel of the rubber cylinder mandrel is closed during setting, and the channel can be opened during unsealing, so that the problem that whether the seal checking channel is normally opened or not cannot be judged in the prior art is solved, and the sealing performance of the rubber cylinder cannot be judged, thereby facilitating the pressure balance and smooth unsealing of the rubber cylinder.

In the concrete work, the packing principle is that after the packer is put into a preset position, steel balls are put into the packer, water is injected into the packer for pressurizing, when the pressure reaches the preset value, the pressure is suddenly reduced to 0, the packer is set, and the production layer and the water outlet layer are packed. In the prior art, when a pipe column is blocked, two lower separators are usually needed to block a water outlet layer (before a production layer), when the sealing is normally tested, only the upper water outlet layer can be tested and sealed, and the lower production layer cannot be tested and sealed, so that whether the lower production layer (oil layer) is sealed well or not can not be tested and sealed, and whether the sealing of the production layer is normal or not can not be obtained, and the construction requirement can not be met. In the utility model, the packer is set as double rubber barrels, the upper sealing is realized through the bypass holes 103 which are matched with the upper rubber barrel group 106, the lower sealing is realized through the oil pipe and the lower bypass channel 113 which are matched with the lower rubber barrel group 114, the full sealing can be realized after the packer falls into the well, specifically, the sealing inspection can be independently carried out through the two rubber barrels, the problem that in the prior art, only one rubber barrel can be used for sealing inspection, namely, in the prior art, only a single sealing inspection can be realized through a sleeve; the utility model can realize the separate packing and seal inspection up and down through the upper and lower groups of rubber barrels. When the packer is used for sealing, the oil pipe and the sleeve are sealed by the two packing barrels, the sealing is tested after the sealing, when the pressure is not reduced, the packer is used, and the packer is used for sealing, so that the sealing of the packer is qualified. Otherwise, if the pressure drop indicates that the packer is not sealed, the packer is unqualified, so that the verification effect of checking the sealing up and down can be obtained. In addition, if the channel needs to be closed, a plurality of setting balls can be thrown down, and then the channel can be directly closed by pressing, so that the later production aspect is not influenced.

Example 2

Referring to FIG. 2, the present embodiment provides a self-checking packer comprising an upper joint 101, an upper mandrel 104, an outer mandrel 111, a central shaft 109, a lower mandrel, a locking assembly 116 and a lower joint 117 connected in sequence and forming a passageway; and the upper and lower ends of the outer hub 111 extend to the exterior of the upper and lower mandrels 104, respectively; the upper mandrel is sleeved with an upper shaft sleeve 105, an upper rubber sleeve group 106 is sleeved outside the upper shaft sleeve 105, a first sleeve ring 102 is sleeved between the upper joint 101 and the upper shaft sleeve 105, and a bypass hole 103 is formed in the first sleeve ring 102; a seal checking ball seat 108 is arranged in the upper mandrel 104 and the central shaft 109 and corresponds to the position sleeved with the outer sleeve 111; the central shaft 109 is provided with a seal testing pressure transmission channel 112 for communicating the outer sleeve 111 and the seal testing ball seat 108; the lower end of the upper shaft sleeve 105 is sleeved with a second sleeve ring 107, wherein the lower end of the second sleeve ring 107 is sleeved with the upper end of the outer shaft sleeve 111; the lower spindle is further sleeved with a third collar 120 and a lower shaft sleeve 119, and the upper end of the third collar 120 extends into the upper end of the outer shaft sleeve 111; the lower shaft sleeve 119 is sleeved with a lower rubber cylinder group 114; wherein a lower bypass channel 113 is further formed between the lower end of the outer sleeve 111 and the upper end of the third collar 120 and the lower spindle; the lower end of the lower spindle extends through the interior of the locking assembly 116.

The seal inspection ball seat 108 is a seal inspection pressure transmission channel closing split ball seat, a split claw head is arranged in the seal inspection ball seat, and a groove for adapting to the split claw head is formed in the inner wall of the seal inspection ball seat. The glue cylinder group 106 is provided with two glue cylinders, and a spacer ring 110 is further arranged in the middle of the glue cylinders. The lower rubber cylinder group 114 is provided with two lower rubber cylinders, and a spacing ring 110 is further arranged in the middle of the lower rubber cylinders. The lower spindle comprises a first lower spindle 115 and a second lower spindle 121, wherein the end part of the second lower spindle 121 is sleeved on the end part of the first lower spindle 121; the locking assembly 116 is sleeved on the first lower mandrel 115 and the second lower mandrel 121; the lower joint 117 is located at the end of the second lower spindle 121.

Setting a sealing ball seat pipe column of a packer, lifting and rotating the pipe column to set the packer after the pipe column is set to a designed setting position, throwing a main channel into the sealing ball seat to 15-20MPa after setting is completed, checking the sealing performance of two groups of rubber cylinders, and improving the pressure to hit down the sealing ball seat after the sealing is completed; and then, throwing a ball with larger size to the split ball seat, increasing the displacement to knock down the ball seat, and at the moment, moving the ball seat downwards to close the seal inspection channel, wherein at the moment, the split claw heads arranged in the split ball seat are opened, and the steel ball falls into the well to form a full-diameter.

And after mechanical setting of the packer is completed, the ball seat is put into the seat from the pipe column, and at the moment, the pipe column is internally sealed, so that the tightness of the two groups of rubber barrels is verified, if the seal checking is successful, the ball seat is knocked down by improving the pressure, and then the seal checking channel is closed by secondary ball injection, so that the next operation and construction can be performed.

As a preferred embodiment, the unique seal inspection channel design can be thrown to close after seal inspection is finished, so that the sealing effect of two groups of rubber barrels is guaranteed, and the integral sealing performance of the packer is not affected by any group of rubber barrels when the seal is lost. The sealing inspection channel is opened before the well is put into the split ball seat after the sealing inspection is finished, the split ball seat is knocked down by pressing about 12MPa with large displacement, the steel ball falls into the well, the split claw head is opened and locked at the inner wall groove, the sealing inspection channel is ensured not to be opened accidentally along with the fluctuation of bottom hole pressure, and the sealing inspection channel is sealed for a long time.

Example 3

Referring to FIG. 5, a self-sealing packer is shown, wherein the locking assembly 116 comprises: slip cone 118, slip pin 122, slip 123, slip ring 124, friction block 125, leaf spring 126, bolt 127, retainer 128, and jacket 129; the inclined surface of the slip cone 118 is at least partially positioned at the lower end of the slip pin 122, and the end of the slip pin 122 is connected with the slip ring 124 in a embedded manner through the slip 123; the slip ring 124 is sleeved at the connecting position of the first lower mandrel 115 and the second lower mandrel 121; the second lower spindle 121 is sleeved with a friction block 125, and a plate spring 126 is arranged between the friction block 125 and the second lower spindle 121; the friction block 125 is connected at a first end to the slip ring 124 and at a second end to the jacket 129 by the bolts 127 and the retainer 128.

When the sealing device is used, firstly, the product qualification certificate is checked, the delivery inspection time is recorded, whether the sealing piece of the product has passed the effective period or not is judged, and whether the threaded connection parts are tightened or not is judged. When the pipe column is lowered, the friction blocks of the packer are shifted to the short groove of the mandrel, the lowering speed is strictly controlled, the suspended weight is increased during the slow lowering, the lowering is stopped, the pipe column is lifted for a certain distance, and then the lowering is continued until the designed lowering depth is reached. After the pipe column is lowered into place, the elongation of the pipe column is calculated according to the depth of the well, the short groove length of the transposition groove of the mandrel of the packer is added, the lifting distance is properly increased on the basis, the lowering pipe column is rotated, the tonnage of the weight indicator is observed to be reduced, if the suspended weight is obviously reduced, the packer enters the long transposition groove, the weight is continuously lowered until the setting tonnage of the packer is reached (the friction resistance of the pipe column is reduced), and the setting of the packer is completed.

When the seal is positively checked, putting a seal checking steel ball into the seal checking ball seat, slowly pumping the seal checking steel ball into the seal checking ball seat, slowly pressing the seal checking steel ball to 15MPa, and increasing the pressure to knock down the ball seat after the seal checking is qualified; and after the seal is removed, putting the steel ball into the pipe column again to the split ball seat, pressing the wellhead to 12-15 MPa with large displacement to shear the split ball seat, allowing the ball seat to descend and open, allowing the steel ball to fall into the well, and closing the seal removing channel.

As a preferred embodiment, the self-checking packer has an outer diameter of 7 inches and a length of 2458mm. The inner diameter of the seal inspection ball seat 108 is 35-55 mm, and the ball throwing diameter is 38mm. The self-checking packer to be applied is 1.3 meters to 1.5 meters in length relative to the RTTS packer, 2458mm self-checking packer, namely 2.458 meters is used, and a longer packer can cover a wider well wall, so that a larger sealing area is ensured, and the risk of leakage is reduced. In addition, longer packers are generally more stable than shorter packers. When pressure is applied, the long packer is easier to keep balanced and is not easy to shake or deform, so that the sealing performance of the packer can be ensured, and the damage risk caused by misoperation is reduced. In summary, longer packers may improve the packing effect and reduce the operational risk.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the utility model.

The self-checking packer provided by the utility model is described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the utility model, and the description of the examples is only used for helping to understand the method and the core idea of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims

1. A self-sealing packer comprising: an upper joint, an upper mandrel, an outer shaft sleeve, a central shaft, a lower mandrel, a locking assembly and a lower joint which are sequentially connected and form a channel; the upper end and the lower end of the outer shaft sleeve extend to the outside of the upper mandrel and the outside of the lower mandrel respectively;

2. The self-sealing packer of claim 1, wherein the sealing ball seat is a split ball seat, a split jaw is arranged in the split ball seat, and a groove for adapting to the split jaw is arranged on the inner wall of the split jaw.

3. The self-sealing packer according to claim 1 or 2, wherein the packing element group is provided with two packing elements, and a spacer ring is further arranged in the middle of the packing elements.

4. The self-sealing packer according to claim 1 or 2, wherein the lower packing element group is provided with two lower packing elements, and a spacer ring is further arranged in the middle of the lower packing elements.

5. The self-sealing packer of claim 1, wherein the lower mandrel comprises a first lower mandrel and a second lower mandrel, wherein an end of the second lower mandrel is sleeved on an end of the first lower mandrel;

6. The self-sealing packer of claim 5, wherein the locking assembly comprises: slip cone, slip pin, slip ring, friction block, leaf spring, bolt, retainer and sheath;

7. The self-sealing packer of claim 1, 2 or 5, wherein the self-sealing packer has an outer diameter of 7 inches and a length of 2458mm.

8. The self-sealing packer of claim 1, 2 or 5, wherein the internal diameter of the sealing ball seat is 35 mm-55 mm, and the ball throwing diameter is 38mm.