CN223359072U - A downhole packer resistant to high temperature and high pressure - Google Patents

Abstract

The utility model discloses a downhole sealer resistant to high temperature and high pressure. The inner tube of the upper joint in the sealer is connected to the inner center tube, the piston working cylinder with a liquid inlet hole and the lower joint in sequence from top to bottom; the outer tube of the upper joint is connected to the upper outer tube, the outer core sleeve and the outer core tube in sequence from top to bottom; the lower outer tube installed outside the inner center tube is connected to the upper push piston, the lower push piston and the lower joint in sequence from top to bottom, the connecting sleeve and the locking sleeve with locking claws are set in the annulus formed by the lower outer tube and the inner center tube, and the lower outer tube and the connecting sleeve are connected by limiting shear pins; the locking claws in the locking sleeve can engage with the locking teeth in the lower outer tube, and the plug-in rubber sleeve is made of carbon nanocomposite material. The rubber sleeve is not only made of excellent high-temperature resistant materials, but also has an optimized structural design. The sealer has a simple structure and low manufacturing cost, and can adapt to the operating environment in high-temperature and high-pressure wells, effectively isolate the oil layer, and promote the efficient and safe development of heavy oil resources.

Description

High-temperature and high-pressure resistant downhole packer

Technical Field

The utility model relates to an underground packer in petroleum industry, in particular to a high-temperature and high-pressure resistant underground packer.

Background

With the continuous increase of global energy demand and the deep development of oil reservoirs, the exploitation of heavy oil resources becomes an important energy supply way. However, the thickened oil has low extraction efficiency by using the conventional extraction method because of the characteristics of high viscosity and poor fluidity. By adopting the thermal recovery technology, the viscosity of crude oil is reduced by injecting heat energy into an oil layer, and the method becomes an effective means for improving the recovery ratio of thickened oil. However, during thermal recovery, the wellbore and reservoir temperatures rise rapidly, which presents a serious challenge to the downhole tool, especially the packer connected in the downhole string, while withstanding high temperatures and pressures, maintains its sealing properties to prevent heat loss, ensure thermal recovery and reduce production costs.

In the prior art situation of high temperature resistant packer, remarkable progress has been made in recent years to a higher level. Specifically, some petroleum exploitation enterprises and scientific research institutions have successfully developed high-temperature resistant packers which can be suitable for thick oil thermal recovery environments, the packers improve the structure and adopt advanced high-temperature resistant materials, such as graphite type high-polymer composite sealing materials, and stable sealing performance can be maintained under high-temperature conditions. The packer can adapt to a large underground temperature change range, and a good working state is ensured to be kept all the time in the production process.

Through retrieval, the conventional high-temperature and high-pressure resistant downhole packer comprises a high-temperature and high-pressure resistant ultra-deep slim well completion packer disclosed in China patent publication No. CN207260988U, wherein a rubber cylinder in the middle of the packer is made of hydrogenated nitrile rubber and fluororubber, the length of the rubber cylinder is 106-110 mm, and slips at the bottom of the packer are inlaid teeth.

Said utility model is applicable to well in which the well completion operation is implemented by means of setting in high-temp. high-pressure 5-1/2 'sleeve, and can meet the setting requirements of high-temp. high-pressure downhole environment and high-strength small wall thickness 5-1/2' sleeve, and can be safely set in 140V steel-grade sleeve, so that it provides technical support for high-temp. high-pressure ultra-deep block well completion operation.

Said utility model can meet the setting requirements of small casing well, but utilizes ratchet locking ring device to provide dynamic support for annular sealing of slips and rubber cylinder, and its reliability of operation is uncertain when the pressure is fluctuated under the well.

The high-temperature and high-pressure resistant packer disclosed in China patent application number 202011453193.8 is firm in installation, good in sealing performance, high-temperature resistant, high-pressure resistant and capable of improving use reliability, and comprises an upper joint, a sealing mechanism, a seat clamping mechanism, a locking mechanism, a central tube, a lower piston, a thrust piston and a lower joint, wherein two groups of pressure transmission holes are formed in the lower joint in a communicated mode, the central tube is screwed below the upper joint, the lower piston is screwed with the thrust piston, the lower joint is screwed with the central tube, the sealing mechanism and the upper half area of the seat clamping mechanism are sleeved in the middle of the upper joint, the upper seat clamping mechanism comprises a positioning key, an upper slip and a first shear pin, the lower seat clamping mechanism comprises a lower slip, a second shear pin is arranged on the lower slip, and the sealing mechanism comprises two groups of rubber cylinder fixing rings, two groups of fixed rubber blocks and two groups of shields.

However, the structure of the invention is complex, and the invention is easy to fail in the complex working environment under the well.

The high-temperature-resistant packer for petroleum exploitation disclosed in China patent application number 202310325578.3 comprises an automatic vertical sleeve of a packer, an automatic vertical suspension frame for installing the automatic vertical sleeve of the packer, a high-temperature-resistant hollow packing bag for packing an oil well, a packing bag plug-in tightening mechanism for reinforcing the high-temperature-resistant hollow packing bag, an extension pipe, a reinforcing connecting rod for reinforcing and connecting the extension pipe, an oil well side wall polishing assembly for polishing an oil well side wall and an oil well side wall drilling assembly for drilling the oil well side wall, wherein the descending process is smooth, the oil well side wall polishing assembly cannot be blocked, the installation is quick, the high-temperature-resistant hollow packing bag realizes a basic packing function, the sealing effect and the firmness are good, the oil well side wall drilling assembly cannot be damaged easily, the inner wall of the oil well mounting groove is polished by the oil well side wall polishing assembly, the inner wall of the oil well mounting groove is smoother, and the high-temperature-resistant hollow packing bag is attached and sealed.

Said invention is characterized by that it contains several components, its structure is complex, its production cost is high, the maintenance and overhaul of equipment are relatively large in investment, and under the high-temperature environment the service life of its material can be more severely tested, and said reasons limit its application in some cost-sensitive mining projects.

Although development of high-temperature-resistant packers has been greatly advanced, problems still exist in the development and application processes of high-temperature-resistant packers applied to heavy oil thermal recovery wells. With the development of oil reservoirs, higher requirements are put forward on the high temperature resistance of the packer, and new materials and new processes are required to be continuously researched and developed to meet the requirements. In the thermal recovery process of the thickened oil, the underground environment is complex and changeable, and higher requirements are put on the adaptability and reliability of the packer. In addition, the manufacturing cost and service life of the packer are also important factors limiting its wide application. In order to meet the requirements of high-efficiency and safe development of thick oil resources, it is important to develop a packer which is resistant to high temperature and high pressure and can be used in a thick oil thermal production well.

Disclosure of Invention

The utility model aims to provide a high-temperature and high-pressure resistant downhole packer which can be applied to a thick oil thermal production well and an ultra-deep well, so that the sealing performance and the high-temperature and high-pressure resistant performance of the packer are improved, the manufacturing cost is reduced, the service life is prolonged, and the construction cost and the production cost are reduced.

The technical scheme is that the high-temperature and high-pressure resistant downhole packer is provided with an upper joint, a rubber cylinder and a lower joint, wherein an inner pipe of the upper joint is sequentially connected with an inner central pipe, a piston working cylinder provided with a liquid inlet hole and the lower joint from top to bottom, an outer pipe of the upper joint is sequentially connected with the upper outer pipe, an outer core sleeve and the outer pipe from top to bottom, the upper outer pipe is connected with the upper joint through a connecting shear pin, a lower outer pipe arranged outside the inner central pipe is sequentially connected with the upper pushing piston, the lower pushing piston and the lower joint from top to bottom, a communication sleeve and a lock sleeve provided with a locking claw are sleeved in an annulus formed by the lower outer pipe and the inner central pipe, the lower outer pipe provided with a limiting shear pin, a deblocking pressing hole I and locking teeth are connected with the communication sleeve through the limiting shear pin, an opposite rubber cylinder separated by a separation ring is arranged between a separation table of the outer pipe and the communication sleeve, and the locking claw in the lock sleeve can be meshed with the locking teeth in the lower outer pipe, and the opposite rubber cylinder is manufactured by a carbon nano composite material.

Preferably, the opposite-inserting type rubber cylinder comprises, but is not limited to, two opposite-inserting split bodies, and the structure of the opposite-inserting end faces of the two opposite-inserting split bodies is L-shaped.

Preferably, the opposite-inserting type rubber cylinder comprises, but is not limited to, two opposite-inserting split bodies, and the structure of the opposite-inserting end faces of the two opposite-inserting split bodies is Z-shaped.

Preferably, the opposite-inserting type rubber cylinder comprises, but is not limited to, two opposite-inserting split bodies, and the structure of the opposite-inserting end faces of the two opposite-inserting split bodies is U-shaped.

Preferably, the carbon nanocomposite used for manufacturing the rubber cylinder is carbon fiber reinforced styrene butadiene rubber.

Preferably, a sealing gasket cylinder is further arranged between the lowest rubber cylinder and the communication sleeve, and the sealing gasket cylinder is arranged outside the outer tube.

Preferably, two groups of liquid inlet holes are arranged in the piston working cylinder, namely a first liquid inlet hole and a second liquid inlet hole, wherein the first liquid inlet hole is arranged above a sealing boss in the outer wall of the piston working cylinder and corresponds to an upper inner cavity of the upper pushing piston in an initial state of the underground packer, and the second liquid inlet hole is arranged below the sealing boss in the outer wall of the piston working cylinder and corresponds to a middle inner cavity of the lower pushing piston in an initial state of the underground packer.

The first limiting shear pin and the first unsealing and pressing hole are respectively arranged at the upper end and the lower end of the lower outer cylinder, the first limiting shear pin arranged at the upper end of the lower outer cylinder is in an initial state of the underground packer and corresponds to the outer wall of the middle of the communicating sleeve, the communicating sleeve can be hung on the first limiting shear pin, the first unsealing and pressing hole arranged at the lower end of the lower outer cylinder is in an initial state of the underground packer and corresponds to the end face of the upper end of the upper pushing piston, and the first limiting shear pin and the first unsealing and pressing hole are respectively arranged at more than two.

Preferably, the outer circle of the lock sleeve is a non-equal-diameter outer circle, the upper outer circle is larger than the lower outer circle, a conical transition section is arranged between the upper outer circle and the lower outer circle, the locking claws are arranged in the upper body and the conical transition section of the lock sleeve and are formed by dividing axial locking grooves communicated with the upper end of the lock sleeve, and the locking claws are arranged above three.

The lower pipe body of the upper pushing piston is provided with a second unsealing and pressing hole, and the second unsealing and pressing hole is arranged in an initial state of the downhole packer, corresponds to the upper end face of the lower pushing piston and is arranged in more than two.

Compared with the prior art, the utility model has the remarkable use effects that:

The sealing mechanism comprises the partition ring, the inner central tube, the rubber cylinder and the sealing gasket cylinder, wherein the rubber cylinder is of a split structure, can be continuously inserted and installed on the outer tube in a mutually opposite mode and is symmetrically partitioned by the partition ring, and the sealing gasket cylinder is arranged at the lower end and isolated from the deblocking mechanism, so that the sealing performance of the rubber cylinder is effectively improved, and the sealing mechanism is particularly suitable for a thick oil well.

The upper end and the lower end of the piston working cylinder are respectively provided with two rows of liquid inlet holes in the circumferential direction, and each row of liquid inlet holes is provided with more than two liquid inlet holes. The lock sleeve is provided with an axial lock groove communicated with the top end and forms a lock claw, the outer wall of the upper part of the lock claw is provided with a tooth-shaped structure meshed with the lock teeth in the inner wall of the lower outer cylinder, and the lock sleeve can be meshed with the lower outer cylinder to meet and improve the sealing performance and the bearing capacity of the rubber cylinder. Under the action of hydraulic pressure, the one-way movement of the upper pushing piston, the lower pushing piston and the lower outer barrel can be realized, and the setting and unsetting operation of the downhole packer in the high-temperature high-pressure well can be completed.

Compared with the high temperature resistant packer used in the oil field at present, the rubber sleeve is not only made of excellent high temperature resistant materials, but also is optimally designed, so that the high temperature resistant packer is simple in structure and low in manufacturing cost, can adapt to the working environment in a high-temperature and high-pressure well, can stably work under the high-temperature and high-pressure condition, effectively isolate an oil layer, improve the recovery efficiency of crude oil, and promote the efficient and safe development of thick oil resources.

In the utility model, the carbon nano composite material is used as the material for manufacturing the rubber cylinder, and the carbon fiber reinforced styrene-butadiene rubber is selected, so that the rubber cylinder has excellent comprehensive performance, good corrosion resistance and long service life, and can effectively improve the high temperature resistance, high pressure resistance and corrosion resistance of the packer.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

fig. 1 is a schematic diagram of the overall structure of the device.

Fig. 2 is a partial schematic structural view of the structure of the connection mechanism in fig. 1.

Fig. 3 is a schematic view of the seal mechanism of fig. 1.

Fig. 4 is a schematic structural view of the deblocking mechanism of fig. 1.

Fig. 5 is a schematic view of the setting mechanism of fig. 1.

Fig. 6 is an enlarged schematic view of the jacket of fig. 1.

Fig. 7 is an enlarged schematic view of the first embodiment of the packing element of fig. 1 and 3.

Fig. 8 is an enlarged schematic view of a second embodiment of a packing element.

Fig. 9 is an enlarged schematic view of a third embodiment of a packing element.

In the figure:

an upper joint 1 is connected with the shear pin 1-1;

The upper outer cylinder 2, the lower joint 3, the outer core sleeve 4, the outer core tube 5, the rubber cylinder 6, the spacer ring 7, the inner central tube 8, the sealing gasket cylinder 9, the communicating sleeve 10 and the lock sleeve 11;

the lower outer cylinder 12, the limiting shear pin 12-1 and the unsealing and pressing hole I12-2;

The pushing piston 13 is arranged, and the second punching hole 13-1 is unsealed;

piston working cylinder 14, liquid inlet hole I14-1 and liquid inlet hole II 14-2;

pushing down on the piston 15.

Detailed Description

The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present utility model. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only 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.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1-9, a downhole packer resistant to high temperature and high pressure is provided with an upper joint 1, a rubber cylinder 6 and a lower joint 3, wherein an inner pipe of the upper joint 1 is sequentially connected with an inner central pipe 8, a piston working cylinder 14 provided with a liquid inlet hole and the lower joint 3 from top to bottom, an outer pipe of the upper joint 1 is sequentially connected with an upper outer cylinder 2, an outer core sleeve 4 and an outer core pipe 5 from top to bottom, the upper outer cylinder 2 is connected with the upper joint 1 through a connecting shear pin 1-1, a lower outer cylinder 12 arranged outside the inner central pipe 8 is sequentially connected with an upper pushing piston 13, a lower pushing piston 15 and the lower joint 3 from top to bottom, a communication sleeve 10 and a lock sleeve 11 provided with locking claws are sleeved in a ring formed by the lower outer cylinder 12 and the inner central pipe 8, the lower outer cylinder 12 provided with a limit shear pin 12-1, a deblocking pressing hole 12-2 and locking teeth is connected with the communication sleeve 10 through the limit shear pin 12-1, a counter-inserted rubber cylinder 6 separated by a spacer 7 is arranged between a spacer of the outer pipe 5 and the communication sleeve 10, the locking claws in the lock sleeve 11 can be meshed with the locking claws 12 in the lower outer cylinder 12, and the counter-locking carbon cylinder 6 is made of a composite material. Carbon nanocomposites include nitrile rubber (NBR), ethylene propylene rubber (EPDM), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), tetrapropylfluororubber (AFLAS), perfluoroether rubber (FFKM), and the like.

The utility model is provided with a connecting mechanism consisting of an upper joint 1, an upper outer cylinder 2 and an outer core sleeve 4, a sealing mechanism consisting of an outer core tube 5, a rubber cylinder 6, a spacer ring 7 and an inner core tube 8, a deblocking mechanism consisting of a communicating sleeve 10, a lock sleeve 11 and a lower outer cylinder 12, and a setting mechanism consisting of an upper pushing piston 13, a piston working cylinder 14, a lower pushing piston 15 and a lower joint 3. The tool can smoothly finish setting in a high-temperature high-pressure well and can finish deblocking after being used in the well.

Because the rubber cylinder 6 in the tool is an opposite-inserted rubber cylinder, is easier to expand and is separated by the spacing ring 7, the sealing performance of the tool in the pit can be effectively improved.

The locking claw of the lock sleeve 11 in the tool is meshed with the locking tooth in the lower outer cylinder 12, so that the setting force of the tool on the rubber cylinder 6 and the bearing capacity after setting are greatly improved.

The setting mechanism in the tool consists of an upper pushing piston 13, a piston working cylinder 14, a lower pushing piston 15 and a lower joint 3, and in the downhole setting process, high-pressure liquid from an inner central tube 8 enters from a liquid inlet hole in the piston working cylinder 14, so that the lower outer cylinder 12, the upper pushing piston 13 and the lower pushing piston 15 can all move upwards along the outer circle of the lower joint 3 under the pushing of hydraulic pressure to compress a rubber cylinder 6, and an oil sleeve annulus between the tool and a sleeve is sealed.

Compared with the existing high-temperature and high-pressure resistant packer, the tool has a relatively simple structure and reduces the manufacturing cost. The underground setting and unsetting of the tool can be completed through ground pressing, the high-temperature and high-pressure working environment in a thick oil thermal production well and an ultra-deep well can be adapted and met, the service life of the tool can be prolonged, and the construction cost and the production cost can be reduced.

The utility model is connected in an oil pipe column through the upper joint 1 and the lower joint 3, works under the high-temperature and high-pressure environment in the pit, and the setting and unsetting processes which are necessary to be completed in the working process are as follows.

The setting process is that firstly, the inner central tube 8 is used for pressing, high-pressure liquid enters from a liquid inlet hole in the piston working cylinder 14 and then pushes the upper pushing piston 13 and the lower pushing piston 15 to ascend and drive the lower outer cylinder 12 to ascend, in the ascending process of the lower outer cylinder 12, the limit shear pin 12-1 in the lower outer cylinder 12 is broken, locking teeth in the limit shear pin are used for clamping locking claws in the locking sleeve 11, and then the rubber cylinder 6 is compressed, compacted and locked, so that the setting of the rubber cylinder 6 is completed.

In the deblocking process, high-pressure liquid enters from a deblocking and pressurizing hole 12-2 in the lower outer cylinder 12 through oil sleeve annular pressurizing, and pushes the lower outer cylinder 12, the upper pushing piston 13 and the lower pushing piston 15 to move downwards, so that the lower outer cylinder 12 is separated from the lock sleeve 11.

On the basis of the first embodiment, the present utility model also has the following embodiments:

In a preferred embodiment, the opposite-inserting type rubber cylinder 6 comprises, but is not limited to, two opposite-inserting split bodies, and the opposite-inserting end faces of the two opposite-inserting split bodies are L-shaped. Referring to fig. 7, an L-shaped slot is provided in the opposite insertion end face of one opposite insertion split body in the rubber cylinder 6, and an opposite insertion protrusion matched with the L-shaped slot is provided in the opposite insertion end face of the other opposite insertion split body, so as to form a combined opposite insertion type rubber cylinder 6. Of course, more than two combined opposite-inserting split bodies matched with the opposite-inserting end face structure can be arranged to form the rubber cylinder 6. The rubber cylinder 6 is made into a split structure, so that the sealing effect on the oil sleeve annulus is better while the tool is beneficial to setting.

In a preferred embodiment, the opposite-inserting type rubber cylinder 6 comprises, but is not limited to, two opposite-inserting split bodies, and the structure of the opposite-inserting end faces of the two opposite-inserting split bodies is Z-shaped. Referring to fig. 8, a Z-shaped slot is provided in an opposite insertion end face of one opposite insertion split body in the rubber cylinder 6, and an opposite insertion protrusion matched with the Z-shaped slot is provided in an opposite insertion end face of the other opposite insertion split body, so as to form a combined opposite insertion type rubber cylinder 6.

In a preferred embodiment, the opposite-inserting type rubber cylinder 6 comprises, but is not limited to, two opposite-inserting split bodies, and the opposite-inserting end faces of the two opposite-inserting split bodies are U-shaped. Referring to fig. 9, a U-shaped slot is provided in an opposite end face of one opposite split of the rubber cylinder 6, and an opposite protrusion matched with the U-shaped slot is provided in an opposite end face of the other opposite split of the rubber cylinder 6, so as to form a combined opposite rubber cylinder 6.

In a preferred embodiment, the carbon nanocomposite used to make the packing element 6 is carbon fiber reinforced styrene butadiene rubber. The strength and modulus of the rubber cylinder 6 manufactured by using the carbon fiber reinforced styrene-butadiene rubber can be effectively improved. Because the ability of pure rubber to withstand external forces is low, when reinforced with carbon fibers, the ability to withstand external forces increases with increasing carbon fiber content.

In a preferred embodiment, a sealing gasket cylinder 9 is also arranged between the lowermost rubber cylinder 6 and the communication sleeve 10, and the sealing gasket cylinder 9 is arranged outside the outer tube 5. The sealing gasket cylinder 9 can further improve the sealing performance and effect of the sealing mechanism consisting of the rubber cylinder 6 and the spacer ring 7.

In a preferred embodiment, two groups of liquid inlet holes are arranged in the piston working cylinder 14, namely a first liquid inlet hole 14-1 and a second liquid inlet hole 14-2, wherein the first liquid inlet hole 14-1 is arranged above a sealing boss in the outer wall of the piston working cylinder 14 and corresponds to an upper inner cavity of the upper pushing piston 13 in an initial state of the downhole packer, and the second liquid inlet hole 14-2 is arranged below the sealing boss in the outer wall of the piston working cylinder 14 and corresponds to a middle inner cavity of the lower pushing piston 15 in the initial state of the downhole packer. Two sets of liquid inlet holes are arranged in the piston working cylinder 14, and the two sets of pushing pistons are pushed by the two sets of liquid inlet holes in the piston working cylinder 14 at the same time, so that the setting and the unsetting of the utility model are smoother.

In a preferred embodiment, the limit shear pin 12-1 and the unsealing and pressing hole I12-2 are respectively arranged at the upper end and the lower end of the lower outer barrel 12, the limit shear pin 12-1 arranged at the upper end of the lower outer barrel 12 is in an initial state of a downhole packer and corresponds to the middle outer wall of the communication sleeve 10, the communication sleeve 10 can be hung on the limit shear pin 12-1, the unsealing and pressing hole I12-2 arranged at the lower end of the lower outer barrel 12 is in an initial state of the downhole packer and corresponds to the upper end face of the upper pushing piston 13, and the limit shear pin 12-1 and the unsealing and pressing hole I12-2 are respectively arranged at more than two.

In a preferred embodiment, as shown in fig. 6, the outer circle of the lock sleeve 11 is a non-equal diameter outer circle, the upper outer circle is larger than the lower outer circle, a conical transition section is arranged between the upper outer circle and the lower outer circle, the locking claws are arranged in the upper body and the conical transition section of the lock sleeve 11 and are divided by axial locking grooves communicated with the upper end of the lock sleeve 11, and the locking claws are arranged in more than three.

In a preferred embodiment, referring to fig. 1 and 4, the outer wall of the upper part of the locking claw is provided with a tooth-shaped structure meshed with the locking tooth in the inner wall of the lower outer cylinder 12, the lower pipe body of the upper pushing piston 13 is provided with a second unsealing and pressing hole 13-1, and the second unsealing and pressing hole 13-1 is arranged at more than two positions corresponding to the upper end surface of the lower pushing piston 15 in the initial state of the downhole packer. By using the tool, high-pressure liquid can push the lower outer cylinder 12 to be quickly separated from the lock sleeve 11 through the first unsealing and pressing hole 12-2 of the lower outer cylinder 12 and the second unsealing and pressing hole 13-1 of the upper pushing piston 13.

The utility model works in high temperature and high pressure environment, and the setting and deblocking process during working is as follows.

The setting process is that firstly, the upper pushing piston 13 and the lower pushing piston 15 are pushed to move upwards through the pressing of the inner central tube 8, the lower outer cylinder 12 is driven to move upwards, and meanwhile, the locking teeth in the lower outer cylinder 12 clamp the locking claws of the locking sleeve 11, so that the rubber cylinder 6 is compressed, and the setting is completed.

The deblocking process is that firstly, the oil sleeve annulus is pressed, high-pressure liquid enters the lower outer cylinder 12 and the upper pushing piston 13, the lower outer cylinder 12, the upper pushing piston 13 and the lower pushing piston 15 are pushed to move downwards, so that the lock sleeve 11 and the lower outer cylinder 12 are quickly unlocked, and quick and complete deblocking is realized.

The embodiments described above are only exemplary embodiments, but the present utility model is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and concept of the present utility model should be included in the scope of the present utility model. Therefore, the scope of protection is not limited to the description above.

Claims (10)

1. A high-temperature and high-pressure resistant underground packer is provided with an upper joint, a rubber sleeve and a lower joint, and is characterized in that an inner pipe of the upper joint is sequentially connected with an inner central pipe, a piston working cylinder provided with a liquid inlet and the lower joint from top to bottom, an outer pipe of the upper joint is sequentially connected with the upper outer pipe, an outer sleeve and the outer pipe from top to bottom, the upper outer pipe is connected with the upper joint through a connecting shear pin, a lower outer pipe arranged outside the inner central pipe is sequentially connected with the upper pushing piston, the lower pushing piston and the lower joint from top to bottom, a communication sleeve and a lock sleeve provided with a locking claw are sleeved in an annulus formed by the lower outer pipe and the inner central pipe, the lower outer pipe provided with a limiting shear pin, a deblocking and pressing hole I and locking teeth are connected with the communication sleeve through the limiting shear pin, an opposite-inserted rubber sleeve separated by a separation ring is arranged between a separation table of the outer pipe and the communication sleeve, and the locking claw in the lock sleeve can be meshed with the locking teeth in the lower outer pipe, and the opposite-inserted rubber sleeve is made of carbon nano composite materials.

2. The high temperature and high pressure resistant downhole packer of claim 1, wherein the packing elements comprise, but are not limited to, two split halves having L-shaped split faces.

3. The high temperature and high pressure resistant downhole packer of claim 1, wherein the packing elements comprise, but are not limited to, two split halves having a Z-shaped configuration of the split faces.

4. The high temperature and high pressure resistant downhole packer of claim 1, wherein the split packing element comprises, but is not limited to, two split halves having a U-shaped configuration of the split faces.

5. The downhole packer of any one of claims 1-4, wherein the carbon nanocomposite used to make the packing element is carbon fiber reinforced styrene butadiene rubber.

6. The high temperature and high pressure resistant downhole packer of claim 5, wherein a gasket tube is further installed between the lowermost packing element and the communication sleeve, the gasket tube being installed outside the outer casing.

7. The downhole packer of claim 5, wherein the two sets of liquid inlets are respectively a first liquid inlet and a second liquid inlet, the first liquid inlet is arranged above the sealing boss in the outer wall of the piston working cylinder and corresponds to the upper inner cavity of the upper pushing piston in the initial state of the downhole packer, and the second liquid inlet is arranged below the sealing boss in the outer wall of the piston working cylinder and corresponds to the middle inner cavity of the lower pushing piston in the initial state of the downhole packer.

8. The high-temperature and high-pressure resistant underground packer of claim 5, wherein the limiting shear pin and the unsealing and pressurizing hole I are respectively arranged at the upper end and the lower end of the lower outer cylinder, the limiting shear pin arranged at the upper end of the lower outer cylinder is in an initial state of the underground packer and corresponds to the middle outer wall of the communication sleeve, the communication sleeve can be hung on the limiting shear pin, the unsealing and pressurizing hole I arranged at the lower end of the lower outer cylinder is in an initial state of the underground packer and corresponds to the upper end face of the upper pushing piston, and the limiting shear pin and the unsealing and pressurizing hole I are respectively arranged at more than two.

9. The downhole packer of claim 5, wherein the outer circle of the lock sleeve is a non-constant diameter outer circle, the upper outer circle is larger than the lower outer circle, a conical transition section is arranged between the upper outer circle and the lower outer circle, the locking claws are arranged in the upper body and the conical transition section of the lock sleeve and are formed by dividing axial locking grooves communicated with the upper end of the lock sleeve, and the locking claws are arranged at more than three parts.

10. The high-temperature and high-pressure resistant underground packer of claim 9, wherein the outer wall of the upper part of the locking claw is provided with a tooth-shaped structure meshed with the locking teeth in the inner wall of the lower outer cylinder, the lower pipe body of the upper pushing piston is provided with a second unsealing and pressurizing hole, and the second unsealing and pressurizing hole is arranged at more than two positions corresponding to the upper end face of the lower pushing piston in the initial state of the underground packer.