Elastic packer rubber sleeve

Abstract

The invention provides an elastic packer rubber sleeve. The elastic packer rubber sleeve comprises a rubber sleeve body, the shape keeping parts are formed on the shoulder parts at the two ends of the rubber sleeve body; connecting parts are arranged at the two ends of the elastic maintaining part, the connecting parts are fixedly connected with a rubber sleeve pressing ring of the packer, and a deformation part is further arranged between the connecting parts and formed in the sleeve wall of the rubber sleeve body. When the seal is removed, the compressed shape maintaining part and the elastic maintaining part correspondingly rebound, the compressed rubber sleeve is driven by restoring force to restore due to the fact that the shape maintaining part and the elastic maintaining part have integrity, seal removing is finally achieved, the probability of rebound failure of the rubber sleeve is greatly reduced, and the sealing effect is improved. And the response rate, the service life and the reliability during sealing removal are improved.

Description

Technical Field

[0001] The invention relates to the technical field of packer rubber cartridges, and in particular to an elastic packer rubber cartridge. Background Art

[0002] The depth of oil and gas field exploitation wells increases year by year, the underground working conditions are different and complex, the difficulty of underground construction increases rapidly, and the diversity of construction processes continues to increase; when conducting large-volume fracturing construction underground, the casing needs to be sealed multiple times in one trip of the tubing.

[0003] The packer rubber cylinder obtained in the prior art, after being recycled and used many times, becomes aged due to continuous pressurization and depressurization, and eventually cannot rebound and withdraw the seal normally after depressurization. When multiple seals are set and withdrawn in one trip of the string, the rubber cylinder cannot be restored to its original state in time when it should be withdrawn, delaying the overall construction progress. Summary of the invention

[0004] In view of the problems in the prior art, an embodiment of the present invention provides an elastic packer rubber cartridge, which can at least partially solve the problems in the prior art.

[0005] In one aspect, the present invention provides an elastic packer rubber cartridge, comprising: a rubber cartridge body;

[0006] Shape-maintaining components are formed on shoulders at both ends of the rubber cartridge body;

[0007] The elastic retaining component has connecting parts at both ends, the connecting parts are fixedly connected to the rubber tube pressure ring of the packer, and a deformation part is also provided between the connecting parts, and the deformation part is penetrated in the tube wall of the rubber tube body.

[0008] Furthermore, the shape maintaining component is a tension spring connected end to end.

[0009] Furthermore, the shape maintaining component is a double-layer tension spring connected end to end.

[0010] Furthermore, the longitudinal cross-sectional shape of the deformation portion of the elastic retaining component matches the longitudinal cross-sectional shape of the rubber cartridge body.

[0011] Furthermore, the longitudinal cross-section shape of one side of the rubber cartridge body is M-shaped, and correspondingly, the longitudinal cross-section shape of one side of the deformation portion of the elastic retaining component is M-shaped.

[0012] Furthermore, the connecting portion of the elastic retaining component is connected to the rubber sleeve pressure ring through a threaded connection.

[0013] Furthermore, the deformation portion of the elastic retaining component and the rubber sleeve body are formed into a whole through a vulcanization bonding process.

[0014] Furthermore, the shape-maintaining component and the rubber cartridge body are formed into a whole through a vulcanization bonding process.

[0015] Furthermore, the elastic retaining component is made of spring steel.

[0016] On the other hand, the present invention also provides a packer, comprising:

[0017] The elastic packer rubber cartridge as described above;

[0018] The rubber tube pressure ring is fixedly connected to the connecting portion of the cylindrical supporting component of the elastic packer rubber tube, so that the elastic packer rubber tube follows the rubber tube pressure ring to move along the axial direction.

[0019] The elastic packer rubber cartridge provided by the embodiment of the present invention comprises: a rubber cartridge body; a shape-retaining component formed at the shoulders at both ends of the rubber cartridge body; an elastic retaining component, with connecting parts provided at both ends, the connecting parts being fixedly connected to the rubber cartridge pressure ring of the packer, and a deformation part being provided between the connecting parts, the deformation part being formed in the wall of the rubber cartridge body. When the seal is removed, the compressed shape-retaining component and the elastic retaining component rebound accordingly, and the compressed rubber cartridge, due to its integrity with the shape-retaining component and the elastic retaining component, returns to its original state driven by the restoring force, and finally the seal is removed, which greatly reduces the probability of rubber cartridge rebound failure and improves its response rate, service life and reliability when the seal is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 It is a schematic structural diagram of an elastic sealing rubber cylinder provided by an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of a tension spring provided in an embodiment of the present invention.

[0023] Figure 3 It is a schematic structural diagram of an elastic retaining component provided by an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of an elastic sealing rubber cylinder provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0026] Figure 1 FIG. 1 is a schematic diagram of the structure of an elastic sealing rubber cylinder provided by an embodiment of the present invention. Figure 1 As shown, the elastic packer rubber cartridge provided by the embodiment of the present invention comprises:

[0027] Rubber cartridge body 1;

[0028] The shape-maintaining components 2 are formed at the shoulders at both ends of the rubber cartridge body 1;

[0029] The elastic retaining component 3 is provided with connecting parts 31 at both ends, and the connecting parts 31 are fixedly connected to the rubber tube pressure ring 4 of the packer. A deformation part 32 is also provided between the connecting parts 31, and the deformation part 32 is formed in the tube wall of the rubber tube body 1.

[0030] During the underground construction process of oil and gas field exploitation, testing, acidizing, fracturing, etc., it is necessary to seal the corresponding position of the pipe string, and after the construction is completed, the corresponding seal needs to be removed to facilitate the subsequent process. In the prior art, when sealing the pipe string, the packer mainly relies on the packer to squeeze the packer rubber cylinder under the action of external force, so that the rubber cylinder is deformed and the annular space is blocked. Since the packer rubber cylinder is only a cylindrical rubber structure, shoulder extrusion may occur under high temperature and high pressure sealing state. On the one hand, it causes damage to the rubber cylinder itself and increases the consumption of the rubber cylinder. On the other hand, after the shoulder extrusion occurs, the sealing performance during sealing cannot be guaranteed, which has an adverse effect and hidden dangers on the overall construction.

[0031] Moreover, after the construction is completed, it is necessary to remove the seal. Under the action of external force, the pipe is lifted to remove the pressure of the packer on the rubber cylinder. When the two ends of the rubber cylinder are no longer under pressure, due to the physical properties of its rubber material, the rubber cylinder will slowly return to its original state, thereby releasing the seal of the annular space. However, as mentioned above, after the rubber cylinder in the prior art has been in a high temperature and high pressure setting state for a long time, the structure has aged or even been damaged. After the pressure is released, the restoring force becomes weak, and it cannot be restored to its original shape in time or even in the end, resulting in the inability to remove the seal of the well section under construction.

[0032] In order to solve the above problems in the prior art, the elastic packer rubber cylinder provided by the present invention is provided with a rubber cylinder sleeve on a central tube 5, and a shape retaining component 2 is provided at the shoulder position at both ends of the rubber cylinder body 1. During the setting construction, the packer rubber cylinder is located between the two rubber cylinder pressure rings 4 of the packer, and the pressure applied from the outside is transmitted to the rubber cylinder through the rubber cylinder pressure ring 4, so that the rubber cylinder is deformed by the pressure and thus seals the annular space.

[0033] Specifically, when the rubber cylinder is extruded, the rubber cylinder pressure ring 4 generally contacts the shoulder of the rubber cylinder and applies pressure. Shape retaining components 2 are provided at both ends of the rubber cylinder body 1 of the present invention. The shape retaining components 2 correspond to the position of the rubber cylinder pressure ring 4 and fit with the rubber cylinder pressure ring 4 when pressurized and sealed.

[0034] It is understandable that the shape-maintaining component 2 can support the rubber cylinder. Under high load, the rubber cylinder with the shape-maintaining component 2 is easier to maintain the stability of its shape, and its stable deformation load is greater. At the same time, the shape-maintaining component 2 arranged at the shoulder can prevent the rubber cylinder from protruding and flowing outward along the annular space when the rubber cylinder is compressed and deformed during setting, thereby improving the contact and maintaining the contact stress, and having the function of preventing the hard rubber cylinder from having a shoulder protrusion.

[0035] It is worth mentioning that in the prior art, a separate spring shoulder guard structure is provided at the shoulder position of the rubber cartridge, but the spring shoulder guard structure is not an integral structure with the rubber cartridge body. The elastic seal rubber cartridge provided in the embodiment of the present invention is a rubber cartridge in which the shape retaining component 2 and the rubber cartridge body 1 are vulcanized into a whole, without the need to provide an additional rubber shoulder guard structure to cover the shape retaining component, so that the shape retaining component 2 and the rubber cartridge body 1 have better integrity. When the shoulder is under pressure, the deformation of the shape retaining component 2 and the rubber cartridge body 1 has higher consistency, which further improves the stability of the shape of the rubber cartridge body 1 and increases its stable deformation load.

[0036] An elastic retaining component 3 is also provided inside the rubber cartridge body 1. The connecting parts 31 at both ends of the elastic retaining component 3 are located outside the rubber cartridge body 1 and are fixedly connected to the rubber cartridge pressure ring 4 of the packer. A deformation part 32 is provided between the connecting parts 31. The deformation part 32 is formed inside the rubber cartridge body 1 to maintain the shape of the rubber cartridge body 1.

[0037] Specifically, the deformation part 32 of the elastic retaining component 3 is an annular spring sheet and is formed between the inner walls of the rubber cartridge body 1. The deformation part 32 is a rigid component. After being formed inside the rubber cartridge body 1, it can increase the elasticity and retraction performance of the rubber cartridge body 1. Specifically, when the rubber cartridge body 1 with the elastic retaining component 3 is compressed, the internal deformation part 32 also deforms accordingly with the rubber cartridge body 1. When the pressure disappears, since the deformation part 32 has extremely strong recovery, while it recovers to its original state, since it is formed inside the rubber cartridge body 1, it will also drive the rubber cartridge body 1 to recover to its original state, that is, provide the rubber cartridge body with an elastic force in the axial direction. When unsealing, it can provide sufficient resilience to make the rubber part of the rubber cartridge fully retract, so as to achieve the function of rapid and effective unsealing, and at the same time, it can also increase the extrusion stress between the outer edge of the rubber cartridge and the inner wall of the sleeve after setting.

[0038] Figure 2 A schematic diagram of the structure of a tension spring provided in an embodiment of the present invention, as shown in FIG. Figure 2 As shown, on the basis of the above embodiments, further, the shape maintaining component 2 is a tension spring connected end to end. Preferably, the shape maintaining component 2 is a double-layer tension spring.

[0039] Specifically, the double-layer tension spring is connected end to end and placed at the shoulder position of the rubber cylinder body 1, so that it forms a whole with the rubber cylinder body 1. When the rubber cylinder body 1 is pressurized for sealing, the rubber cylinder pressure ring 4 is pressed on the shoulder position of the rubber cylinder body 1. At this time, the tension spring in the shoulder position can support the rubber cylinder body 1. Under high load, the rubber cylinder with a tension spring is easier to maintain stability, and its stable deformation load is greater. At the same time, the tension spring can prevent the rubber cylinder from protruding and flowing outward along the annular space when the rubber cylinder is deformed during sealing, thereby increasing the contact and maintaining the contact stress, and has the function of preventing the hard rubber cylinder from having a shoulder protrusion.

[0040] The spring expands and stretches outward under the action of the setting force. At this time, a gap will be formed between the spring wires. At this time, the rubber of the rubber sleeve using a single-layer spring will be squeezed out from the gap, which will have a certain impact on the stability of the rubber sleeve. The double-layer spring will better block the gap, thereby reducing the extrusion of rubber and ensuring that the rubber sleeve has better stability.

[0041] It should be noted that the spacing between the inner and outer springs of the double-layer spring is set according to actual needs so that they can be installed in the rubber cartridge. However, due to the limited space in the rubber cartridge, the spacing should be set as small as possible.

[0042] Specifically, the spacing between the two layers of springs is preferably between 0.2 and 1.0 mm. It should be noted that the spacing between the two layers of springs should focus on the sealing gap between the application position of the rubber sleeve and the sleeve. When the sealing gap is between 3 and 5 mm, the spring expansion amplitude is small and the gap between the spring wire diameters is small. At this time, the spacing between the two layers of springs can be selected to be a larger value, for example, the spacing between the two layers of springs can be selected to be between 0.6 and 1.0 mm; on the contrary, when the sealing gap is greater than 5 mm, the spring expansion amplitude is large, and the gap between the spring wire diameters is large. At this time, the spacing between the two layers of springs can be selected to be a smaller value, for example, the spacing between the two layers of springs can be selected to be between 0.2 and 0.6 mm;

[0043] On the basis of the above-mentioned embodiments, further, the cross-sectional shape of the deformation portion 32 of the elastic retaining component 3 matches the longitudinal cross-sectional shape of the rubber cartridge body 1 .

[0044] Specifically, an elastic retaining component 3 is provided in the inner wall of the rubber cartridge body 1, and its purpose is to improve the retraction performance of the rubber cartridge body 1 after the pressure disappears. Specifically, when the rubber cartridge body 1 with the elastic retaining component 3 is compressed, the internal deformation portion 32 also deforms accordingly with the rubber cartridge body 1. When the pressure disappears, since the deformation portion 32 has extremely strong restorability, while it recovers to its original state, since it is formed inside the rubber cartridge body 1, it will also drive the rubber cartridge body 1 to recover to its original state, that is, provide the rubber cartridge body with an elastic force in the axial direction. When unsealing, it can provide sufficient resilience, so that the rubber part of the rubber cartridge can fully retract, thereby achieving the function of rapid and effective unsealing, and at the same time, it can also increase the extrusion stress between the outer edge of the rubber cartridge and the inner wall of the casing after sealing.

[0045] In this embodiment, after matching the longitudinal cross-sectional shape of the deformation portion 32 of the elastic retaining component 3 with the longitudinal cross-sectional shape of the rubber cylinder body 1, the integrity between the deformation portion 32 and the rubber cylinder body 1 can be further improved, so that when the pressure is sealed and unsealed, the deformation of the two has better consistency, and the rubber cylinder body 1 can be better driven by the deformation portion 32, follow the deformation portion 32 to restore its shape, and release the blockage of the annular space.

[0046] On the basis of the above embodiments, further, the longitudinal cross-section shape of one side of the rubber cartridge body 1 is M-shaped, and correspondingly, the longitudinal cross-section shape of one side of the deformation portion 32 of the elastic retaining component 3 is M-shaped.

[0047] As mentioned above, when the deformation portion 32 matches the longitudinal cross-sectional shape of the rubber cartridge body 1, the two can have better deformation consistency. In the embodiment of the present invention, the rubber cartridge body is firstly set to have an M-shaped longitudinal cross-sectional shape, that is, the rubber cartridge body is a symmetrical structure, and there is a groove in the middle position where the axis of symmetry is located. When the rubber cartridge body 1 is squeezed, the rubber cartridge body 1 of this shape can better seal the annular space.

[0048] At the same time, the deformation portion 32 of the elastic retaining component 3 is also set to an M shape to match the shape of the rubber cylinder body. Since the deformation portion 32 itself is a rigid material such as spring steel, its overall rigidity is good. In order to ensure that the deformation portion 32 has good recovery while also having good deformation performance, the deformation portion 32 is set to an M shape with reference to the spring structure.

[0049] The deformation part 32 is set to be M-shaped. On the one hand, the deformation part 32 can match the shape of the aforementioned preferred rubber cartridge body 1 to improve its integrity. On the other hand, the longitudinal section of the deformation part 32 is M-shaped, which is equivalent to the shape of a spring. When the deformation part 32 with this cross-sectional shape is subjected to the setting pressure, the additional resistance generated during deformation is smaller than when the longitudinal section is cylindrical. Therefore, the deformation part 32 with the M-shaped cross section ensures that it has good deformation ability and rebound performance.

[0050] It is worth mentioning that the cross-sectional shape of the deformation portion 32 is set to be M-shaped, and the closer the middle position is to the inner wall of the rubber cylinder, the easier it is to be compressed and deformed when the rubber cylinder is subjected to the setting force. However, for the consideration of sealing, a certain thickness of rubber should also be provided here.

[0051] Figure 3 is a schematic structural diagram of an elastic retaining component provided by an embodiment of the present invention, Figure 4 FIG. 1 is a schematic diagram of the structure of an elastic sealing rubber cylinder provided by an embodiment of the present invention. Figure 3 and Figure 4 As shown, on the basis of the above embodiments, further, the deformation portion 32 is provided with a plurality of rows of openings 321 arranged along the circumferential direction.

[0052] The shape of the opening 321 can be circular, square, etc. The size and number of the openings are set according to actual needs and are not specifically limited in this embodiment.

[0053] The above-mentioned opening 321 is set on the elastic retaining component 3. When the elastic retaining component 3 and the rubber cartridge body are integrally formed, the rubber in the rubber cartridge body 1 is also fused with the opening 321, so that the rubber cartridge body 1 and the elastic retaining component 3 can better form an integral component, thereby improving the integrity of the two, ensuring the consistency of deformation between the elastic retaining component 3 and the rubber cartridge body 1 during the compression and expansion of the rubber cartridge body 1 under the action of the axial compressive force, and the retraction process when the axial compressive force is removed, thereby avoiding the phenomenon of bonding failure caused by inconsistent compression deformation of the elastic retaining component 3 and the rubber cartridge body 1.

[0054] On the basis of the above embodiments, further, the connection portion 31 of the elastic retaining component 3 and the rubber cylinder pressure ring 4 are connected by threads.

[0055] Specifically, Figure 1 As shown, the rubber cylinder pressure ring 4 and the connecting part 31 are fixedly connected by means of threads, so that the rubber cylinder pressure ring 4 will also pull the connecting part 31 when it moves. When unsealing and withdrawing the tube, the rubber cylinder pressure ring moves in a direction away from the rubber cylinder body 1, and at the same time pulls the connecting part 31 to move in this direction. Further, the connecting part 31 drives the deformed part 32 to start rebounding. In this way, when the setting pressure disappears, the deformed part 32 not only recovers its original state under the action of its own restoring force, but is also driven by the corresponding traction force, and finally drives the rubber cylinder body to fully retract, so as to achieve rapid and effective unsealing.

[0056] A clamping shoulder 311 is provided at the position where the connecting portion 31 contacts the rubber cartridge body 1 . When the rubber cartridge pressing ring 4 is pressurized, the clamping shoulder 311 presses against the rubber cartridge body 1 , thereby preventing the elastic retaining component 3 from sliding in the rubber cartridge after being pressurized and causing dislocation.

[0057] The connecting portion 31 is further provided with a groove on a side close to the central tube 5 , so that a sealing gasket groove 6 is formed between the connecting portion 31 and the central tube 5 for accommodating a sealing gasket.

[0058] On the basis of the above embodiments, further, the deformation portion 32 of the elastic retaining component 3 and the rubber cartridge body 1 are formed into a whole through a vulcanization bonding process, and the shape retaining component 2 and the rubber cartridge body 1 are formed into a whole through a vulcanization bonding process.

[0059] Specifically, the rubber cartridge body 1 is vulcanized and molded using a high-hardness material such as fluororubber (FKM), hydrogenated nitrile rubber (HNBR) or nitrile rubber (NBR). The rubber cartridge body 1 is a composite rubber cartridge structure. After being deformed by setting, due to its composite characteristics, it is vulcanized to form a whole with the shape-maintaining component 2 and the deformed portion 32 of the elastic retaining component 3.

[0060] On the basis of the above embodiments, further, the elastic retaining component 3 and the shape retaining component 2 are made of spring steel.

[0061] Specifically, the shape retaining component 2 is a double-layer tension spring made of 304 stainless steel or 65Mn spring steel, and the elastic retaining component is made of 304 stainless steel or 65Mn spring steel, so that the rubber cylinder body 1 has good elasticity, stability and retraction performance.

[0062] On the basis of the above-mentioned embodiments, the present invention further provides a packer, which includes the elastic packer rubber tube and the rubber tube pressure ring 4 described in the above-mentioned embodiments, and the rubber tube pressure ring 4 is fixedly connected with the connecting part 31 of the elastic retaining component 3 of the elastic packer rubber tube, so that the elastic packer rubber tube follows the rubber tube pressure ring to move along the axial direction.

[0063] Specifically, in the packer provided by the embodiment of the present invention, the rubber sleeve pressure ring 4 and the connecting part 31 are fixedly connected by means of threads, so that the rubber sleeve pressure ring 4 will also pull the connecting part 31 when it moves. When unsealing and withdrawing the pipe, the rubber sleeve pressure ring moves in a direction away from the rubber sleeve body 1, and at the same time pulls the connecting part 31 to move in this direction. Further, the connecting part 31 drives the deformed part 32 to start rebounding. In this way, when the setting pressure disappears, the deformed part 32 not only recovers to its original state under the action of its own restoring force, but is also driven by the corresponding traction force, and finally drives the rubber sleeve body to fully retract, so as to achieve rapid and effective unsealing.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An elastic packer rubber cartridge, characterized in that: include: Rubber cartridge body; Shape-maintaining components are formed on shoulders at both ends of the rubber cartridge body; The elastic retaining component has connecting parts at both ends, the connecting parts are fixedly connected to the rubber tube pressure ring of the packer, and a deformation part is also provided between the connecting parts, and the deformation part is penetrated in the tube wall of the rubber tube body.

2. The elastic packer rubber cartridge according to claim 1, characterized in that: The shape maintaining component is a tension spring connected end to end.

3. The elastic packer rubber cartridge according to claim 1, characterized in that: The shape maintaining component is a double-layer tension spring connected end to end.

4. The elastic packer rubber cartridge according to claim 1, characterized in that: The cross-sectional shape of the deformation portion of the elastic retaining component matches the longitudinal cross-sectional shape of the rubber cartridge body.

5. The elastic packer rubber cartridge according to claim 4, characterized in that: The longitudinal cross-section shape of one side of the rubber cartridge body is M-shaped, and correspondingly, the longitudinal cross-section shape of one side of the deformation portion of the elastic retaining component is M-shaped.

6. The elastic packer rubber cartridge according to claim 1, characterized in that: The connecting portion of the elastic retaining component is connected to the rubber cylinder pressure ring through a thread.

7. The elastic packer rubber cartridge according to any one of claims 1 to 6, characterized in that: The deformation portion of the elastic retaining component and the rubber sleeve body are formed into a whole through a vulcanization bonding process.

8. The elastic packer rubber cartridge according to any one of claims 1 to 6, characterized in that: The shape-maintaining component and the rubber cartridge body are formed into a whole through a vulcanization bonding process.

9. The elastic packer rubber cartridge according to any one of claims 1 to 6, characterized in that: The elastic retaining component is made of spring steel.

10. A packer, characterized in that: include: The elastic packer rubber cartridge according to any one of claims 1 to 9; The rubber tube pressure ring is fixedly connected to the connecting portion of the elastic retaining component of the elastic packer rubber tube, so that the elastic packer rubber tube follows the rubber tube pressure ring to move along the axial direction.

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