CN213711018U

CN213711018U - Composite packer

Info

Publication number: CN213711018U
Application number: CN202022492922.2U
Authority: CN
Inventors: 方倩; 王志清; 周文玉; 程连文; 张宏杰; 苗玉礼; 李剑
Original assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Henan Oilfield Branch Co
Current assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Henan Oilfield Branch Co
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-07-16
Anticipated expiration: 2030-11-02

Abstract

The utility model relates to an oil field development oil recovery instrument field has especially related to a compound packer. The composite packer comprises a central pipe, a rubber cylinder assembly and a piston assembly, wherein the rubber cylinder assembly is arranged at the upper part of the central pipe and used for expanding along the radial direction when being subjected to axial pressure so as to set the composite packer; the piston assembly is arranged on the central pipe, is positioned below the rubber cylinder assembly and is used for applying axial pressure to the rubber cylinder assembly when the central pipe is pressed; the rubber cylinder component comprises an anti-corrosion rubber cylinder which is arranged close to the upper part and is resistant to carbon dioxide corrosion and a heat-resistant rubber cylinder which is arranged close to the lower part and is resistant to high temperature. When the high-temperature-resistant rubber barrel is used, the high temperature in the thermal recovery process can be borne through the heat-resistant rubber barrel, and the corrosivity of carbon dioxide in the thermal recovery process can be borne through the corrosion-resistant rubber barrel. The utility model discloses with the packing element combination of two kinds of materials, can improve the shutoff reliability of the supplementary steam of carbon dioxide well of taking in and sending out separate production technology, solved the problem that the corrosion-resistant packer among the prior art can't adapt to the high temperature.

Description

Composite packer

Technical Field

The utility model relates to an oil field development oil recovery instrument field has especially related to a compound packer.

Background

The carbon dioxide oil extraction technology has the advantages of low oil displacement cost, obvious recovery ratio improvement and the like, is widely applied to various domestic oil fields, and has obvious yield increasing effect. The carbon dioxide oil extraction technology is applied to the Henan oilfield in 2017, the carbon dioxide oil extraction technology of the second oil extraction plant of the Henan oilfield is applied for 208 accumulated wells at present, the comprehensive effective rate is 80%, and a certain effect is achieved. The method is used for deeply analyzing the action mechanism and the application effect of carbon dioxide on different types of oil reservoirs such as common heavy oil, hot common heavy oil, shallow super heavy oil, middle-deep ultra heavy oil, high pour-point oil, edge water oil reservoirs and the like, and has mature knowledge. However, in the whole view, the carbon dioxide oil recovery process technology is still in the starting stage, and the matched process pipe column has not been subjected to deep research. The carbon dioxide is sealed and injected into the well for 8 times, the packers are all out of work in the injection process, the sealing validity period of the packers is less than one steam injection period, and the application in sealing, extracting and lowering the well cannot be met. Through field and experimental analysis, CO2 can permeate into the rubber, so that the packer rubber barrel is corroded to cause plugging failure.

In order to solve the problems, the patent specification with the publication number of CN201851072U and the publication date of 2011, 6 and 1 discloses an oil well corrosion-resistant packer, the structure of the packer is as shown in fig. 1, the packer comprises three parts, namely a supporting device consisting of an upper joint 1, a central pipe 6 and a lower joint 16, an anchoring device consisting of a deblocking sleeve 2, an upper cone 3, a positioning block 4, a slip cover 5, a slip 7 and a lower cone 8, and a sealing device consisting of an upper pressing ring 9, a rubber cylinder shaft 10, a rubber cylinder 11, a lower pressing ring 12, a locking spring 13, a piston 14, a cylinder barrel 15 and a pin 17, wherein the anchoring device is arranged at the upper part and the sealing device is arranged at the lower part between the upper joint 1 and the lower joint 16 on the outer wall of the central pipe 6; the rubber cylinder 11 is of an integral structure, is arranged on the rubber cylinder shaft 10 and is pressed and fixed by the upper pressing ring 9 and the lower pressing ring 12.

The working principle and the using method of the oil well corrosion-resistant packer are as follows: the oil well corrosion-resistant packer can be connected with a tubing string through the upper joint 1 and the lower joint 16 and is put into a well to carry out layered operation construction; when in use, the anchoring device is arranged on the sealing device, and the anchoring device can not be contacted with corrosive media such as underground carbon dioxide and the like after being set, so that the damage caused by corrosion can be avoided; meanwhile, the rubber barrel 11 is of a cylindrical integral structure, so that no spacer sleeve which is easy to corrode and damage exists, and the corrosion resistance is improved.

However, the packer is only suitable for the carbon dioxide injection process of a common production well, and is not suitable for the carbon dioxide oil extraction process of a steam huff and puff thermal production well due to the problem that sealing failure is easy to generate in a high-temperature environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a compound packer to solve current corrosion-resistant packer and be not suitable for the problem of steam heat recovery well of taking in and send out.

The utility model discloses a compound packer adopts following technical scheme: the composite packer comprises a central pipe;

the rubber sleeve assembly is arranged at the upper part of the central pipe and used for expanding along the radial direction when being subjected to axial pressure so as to set the composite packer;

the piston assembly is arranged on the central pipe, is positioned below the rubber cylinder assembly and is used for applying axial pressure to the rubber cylinder assembly when the central pipe is pressed;

the rubber cylinder component comprises an upper corrosion-resistant rubber cylinder resistant to carbon dioxide corrosion and a lower high-temperature-resistant heat-resistant rubber cylinder.

Has the advantages that: the utility model discloses an in the compound packer, because the packing element subassembly is including leaning on the anti-corrosion packing element and the heat-resisting packing element of setting, and wherein anti-corrosion packing element has carbon dioxide corrosion resistant characteristic, and heat-resisting packing element has high temperature resistance characteristic, consequently when using, and the heat-resisting packing element of accessible bears the high temperature of thermal recovery in-process, bears the corrosivity of the carbon dioxide of thermal recovery in-process through anti-corrosion packing element. The utility model discloses with the packing element combination of two kinds of materials, can improve the shutoff reliability of the supplementary steam of carbon dioxide well of taking in and sending out separate production technology, solved the problem that the corrosion-resistant packer among the prior art can't adapt to the high temperature.

Furthermore, a spacer bush is arranged between the heat-resistant rubber cylinder and the corrosion-resistant rubber cylinder. The spacer sleeve can play a role in separating the heat-resistant rubber cylinder from the corrosion-resistant rubber cylinder and prevent corrosion or high-temperature extension.

Furthermore, the corrosion-resistant rubber cylinders are more than two, and two adjacent corrosion-resistant rubber cylinders are separated by a spacer ring. More than two corrosion resistant glue cylinders will be more reliable.

Furthermore, the lower end opening of the heat-resistant rubber cylinder is a conical opening, the piston assembly comprises an upper piston with the upper end adjacent to the heat-resistant rubber cylinder, and the upper end of the upper piston is in a conical shape matched with the conical opening at the lower end of the heat-resistant rubber cylinder. The port is the taper mouth under the heat-resisting packing element to the upper end shape of going up the piston is the toper with the taper mouth adaptation of heat-resisting packing element lower extreme, adopts this kind of structure, can directly order about heat-resisting packing element expansion through last piston when using, has the effect of supplementary heat-resisting packing element expansion.

Furthermore, a sealing ring with a conical section is arranged at the upper end of the heat-resistant rubber cylinder on the central pipe, and the large end of the sealing ring is arranged above the central pipe. The sealing ring is used for being matched with the upper end of the upper piston, and the sealing performance between the upper piston and the central pipe is guaranteed.

Furthermore, the piston assembly comprises an upper piston and a lower piston, a cylindrical lock ring seat and a cylindrical cylinder sleeve are mounted on the central tube, the lower piston is mounted between the outer wall of the lock ring seat and the inner wall of the cylinder sleeve, a lock sleeve is further arranged between the lock ring seat and the cylinder sleeve, the outer wall surface of the lock sleeve is in sliding sealing fit with the inner wall surface of the cylinder sleeve, the inner wall surface is in sealing fit with the outer wall surface of the lock ring seat, the lower end of the lock ring seat is in press fit with the top of the lower piston, the upper end of the lock ring seat is in thrust fit with the upper piston, and a pressure transfer channel communicated with the lower end surfaces. The double-piston structure of the upper piston and the lower piston is adopted, the function of assisting force can be achieved, the rubber cylinder component is compressed under larger pressure, and reliable setting of the packer is achieved.

Further, the upper end of the lock sleeve is thrust fitted by being fixed to the upper piston. The upper end of the lock sleeve is fixed with the upper piston, so that the lock sleeve and the upper piston are in thrust fit, and the effect of facilitating sealing of the fit position of the lock sleeve and the upper piston is achieved.

Furthermore, the upper end of the lock ring seat is provided with a convex ring protruding outwards, and the lock sleeve is in sliding sealing fit with the lock ring seat at the convex ring. The upper end of the lock ring seat is provided with a convex ring which protrudes outwards, and the convex ring is in sliding sealing fit with the lock sleeve, so that compared with other structures, the structure of the lock sleeve can be simplified, and the structure of the whole device tends to be simple.

Furthermore, the central tube comprises a tube part and a lower joint connected to the lower end of the tube part, the upper end of the lower joint is provided with a lower annular table, and the cylinder sleeve is fixedly installed on the lower annular table of the lower joint. The cylinder sleeve is fixed on the lower ring platform of the lower joint, so that the inherent structure of the lower joint is fully utilized, and the cylinder sleeve has the advantages of simple and compact structure.

Furthermore, the central tube comprises a tube part and an upper joint connected to the upper end of the tube part, and the upper end of the corrosion-resistant rubber tube is attached to the lower end face of the upper joint. The upper end of the corrosion-resistant rubber cylinder is attached to the lower end face of the upper joint, so that the inherent structure of the upper joint is fully utilized, and the corrosion-resistant rubber cylinder has the advantages of simple and compact structure.

Drawings

FIG. 1 is a schematic diagram of a prior art corrosion-resistant packer for an oil well;

FIG. 2 is a schematic structural view of embodiment 1 of the composite packer of the present invention;

FIG. 3 is an enlarged partial view of an upper portion of the composite packer of FIG. 2;

FIG. 4 is an enlarged view of a portion of the lower portion of the composite packer of FIG. 2.

In fig. 1: 1-upper joint, 2-central tube, 3-spacing ring, 4-pressure sealing head, 5-adjusting seat, 6-adjusting cylinder, 7-outer sleeve, 8-connecting piece, 9-lower joint and 10-sealing component.

In fig. 2: 11-central tube, 111-upper joint, 12-supporting device, 13-lifting hanging ring, 131-inner edge, 14-protective sleeve, 141-discharge port, 15-lower joint, 16-sealing gasket, 17-lower retaining ring, 18-pressure ring and 19-upper retaining ring.

In fig. 3: 11-central tube, 111-upper joint, 12-supporting device, 13-lifting hanging ring, 131-inner edge, 14-protective sleeve, 19-upper retaining ring.

In fig. 4: 11-central tube, 12-support device, 14-protective sleeve, 141-discharge port, 15-lower joint, 16-sealing gasket, 17-lower retaining ring, 171-square groove and 18-pressure ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Example 1:

as shown in fig. 2-4, includes a center tube, a cartridge assembly and a piston assembly.

The central tube comprises a tube portion 11, an upper joint 12 at the upper end of the tube portion and a lower joint 13 at the lower end of the tube portion. The pipe portion 11 is divided into three sections of an upper section, a middle section and a lower section, wherein the diameter of the upper section is larger than that of the middle section, and the diameter of the middle section is larger than that of the lower section, so that a first step surface is formed between the upper section and the middle section, and a second step surface is formed between the middle section and the lower section. In addition, the upper and lower ends of the pipe portion 11 are provided with male screws, respectively. The upper joint 12 has a lower large-diameter section that is screw-fitted to the upper end of the pipe 11 and is provided with a first seal ring 14 and a first coil root 15, and an upper small-diameter section that is located above and below the upper end of the pipe 11 and has a lower end surface that extends radially beyond the upper section of the pipe 12, thereby forming a flange. The lower joint 13 has an upper lower joint large diameter section and a lower joint small diameter section, which are screw-fitted together and sealed with each other with the lower end of the pipe portion 11.

The rubber sleeve component is integrally arranged at the upper part of the central pipe and is used for expanding along the radial direction when being subjected to axial pressure so as to set the composite packer, and comprises an upper corrosion-resistant rubber sleeve 16 which is resistant to carbon dioxide corrosion and a lower high-temperature-resistant heat-resistant rubber sleeve 17. The corrosion-resistant rubber cylinders 16 are cylindrical cylinders, in this embodiment, the material thereof is hydrogenated nitrile, the number thereof is two, a spacer ring 18 is arranged between the two corrosion-resistant rubber cylinders 16, and the spacer ring 18 is a rigid spacer ring. The upper end surface of the upper one of the two corrosion-resistant rubber cylinders 16 is fitted to the lower end surface of the upper joint 12. The heat-resistant rubber barrel 17 is positioned below the corrosion-resistant rubber barrel, a spacer 19 is arranged between the heat-resistant rubber barrel and the corrosion-resistant rubber barrel 16, and the spacer 19 is in guiding fit with the middle section of the pipe part of the central pipe through an inner convex edge arranged in the spacer 19 and is in guiding fit with the upper section of the pipe part of the central pipe through an inner hole at the upper end of the spacer. The heat-resistant rubber cylinder 17 is made of modified polytetrafluoroethylene, the upper end face of the heat-resistant rubber cylinder is in top-pressing fit with the lower end face of the spacer sleeve 19, the orifice at the lower end of the heat-resistant rubber cylinder is a conical opening, a sealing ring 20 is arranged on the pipe part 11 of the central pipe at a position close to the heat-resistant rubber cylinder 17, the section of the sealing ring 20 is conical, and the end with the larger diameter is arranged at the upper part.

The piston assembly comprises an upper piston 21 and a lower piston 22, the upper piston 21 is assembled on the pipe part 11 of the central pipe in a sliding and sealing mode, the upper end of the upper piston is matched with the heat-resistant rubber cylinder 17, specifically, the upper end of the upper piston 21 is provided with a conical structure, the shape of the conical structure is matched with that of the conical opening of the heat-resistant rubber cylinder 17, and the conical structure is inserted into the conical opening of the heat-resistant rubber cylinder 17. The sealing fit between the upper piston 21 and the pipe part 11 of the central pipe is realized by a third sealing ring 23 arranged on the upper piston, and two third sealing rings 23 are arranged at intervals along the axial direction of the upper piston 21; a lock sleeve 24 is fixedly connected to the lower end of the upper piston 21 through threads, and a fourth sealing ring 25 is arranged between the lock sleeve 24 and the upper piston 21 and is in sealing fit with the upper piston through the fourth sealing ring 25. A lock ring seat 26 is arranged below the upper piston 21, the upper end of the lock ring seat 26 is in stop fit with the second step surface between the middle section and the lower section of the pipe part 11 of the central pipe, and the lower end is tightly pressed by the lower joint 13 of the central pipe, so that the central pipe is fixed. The upper end of the lock ring seat 26 is provided with a convex ring protruding outwards, the lock sleeve 24 is in sliding sealing fit with the lock ring seat 26 at the convex ring, the sealing fit between the lock sleeve and the lock ring seat is realized by a fifth sealing ring 27, and the fifth sealing ring 27 is provided with two sealing rings which are arranged at intervals along the axial direction of the lock ring seat 26. To this end, a pressure chamber of the upper piston 21 is defined by the lower end of the upper piston 21, the outer side wall of the pipe portion 11 of the center pipe, the upper side wall of the lock ring seat 26, and the inner side wall of the lock sleeve 24, and a gap is provided between the inner wall surface of the lock ring seat 26 and the outer wall surface of the pipe portion 11 of the center pipe, and the gap forms a pressure transfer passage which is communicated with a pressure transfer hole 28 provided in the pipe portion 11 of the center pipe and is used for transferring the pressure in the center pipe to the pressure chamber of the upper piston 21.

The lower piston 22 is provided with a cylinder sleeve 29, the large-diameter section of the lower joint 13 forms a lower annular table, the lower end of the cylinder sleeve 29 is fixedly and hermetically connected with the lower annular table of the lower joint 13, the sealing between the lower end of the cylinder sleeve 29 and the lower annular table of the lower joint 13 is realized by a sixth sealing ring 30, the lower piston 22 is arranged in a cavity enclosed between the outer wall surface of the lock ring seat 26 and the inner wall surface of the cylinder sleeve 29, and a gap is arranged between the lower end surface of the lower piston and the upper end surface of the lower joint 13, so that the pressure in the central tube can be transmitted to; the outer wall surface of the lock sleeve 24 is in sliding sealing fit with the inner wall surface of the cylinder liner 29 and abuts against the upper end of the lower piston 22.

The utility model discloses a when compound packer used, with top connection on the oil pipe of oil production pipe post, when the setting position was transferred to the tubular column, connect and suppress the pipeline, begin to sit and seal. At the moment, hydraulic pressure is transmitted to the lower end faces of the upper piston and the lower piston through a pressure transmission channel formed by the central tube in clearance fit with the lock ring seat, a pressure transmission groove at the tail end of the lock ring seat and a clearance between the upper piston and the end face of the lock ring seat, the piston is pushed axially, the corrosion-resistant rubber cylinder is expanded continuously, the axial size is shortened gradually, the radial size is enlarged gradually, the heat-resistant rubber cylinder is wedged and expanded by the upper piston, and finally the annular space between the oil tube and the sleeve is sealed, so that the purpose of plugging is achieved.

Example 2:

the present embodiment is different from embodiment 1 only in that only one corrosion-resistant rubber tube is provided in the present embodiment, but of course, in other embodiments, the number of corrosion-resistant rubber tubes may be arbitrarily set as required, and three or more corrosion-resistant rubber tubes may be provided.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. The composite packer comprises a central pipe;

the piston assembly is arranged on the central pipe, is positioned below the rubber cylinder assembly and is used for applying axial pressure to the rubber cylinder assembly when the central pipe is pressed; it is characterized in that the preparation method is characterized in that,

2. A composite packer as claimed in claim 1, wherein a spacer is provided between the heat and corrosion resistant rubber cylinders.

3. A composite packer as claimed in claim 1 or claim 2, wherein there are more than two corrosion resistant rubber cylinders, and two adjacent corrosion resistant rubber cylinders are separated by a spacer ring.

4. A composite packer as claimed in claim 1, wherein the lower port of the heat-resistant packing element is a tapered port, the piston assembly comprises an upper piston having an upper end adjacent to the heat-resistant packing element, and the upper end of the upper piston is tapered to fit the tapered port of the lower end of the heat-resistant packing element.

5. A composite packer as claimed in claim 1, wherein the central tube is provided with a sealing ring having a conical cross-section at the upper end of the heat-resistant packing element, the sealing ring having a larger end at the upper end.

6. The composite packer as claimed in claim 1, wherein the piston assembly comprises an upper piston and a lower piston, the central tube is provided with a cylindrical lock ring seat and a cylindrical cylinder sleeve, the lower piston is installed between the outer wall of the lock ring seat and the inner wall of the cylinder sleeve, a lock sleeve is further arranged between the lock ring seat and the cylinder sleeve, the outer wall surface of the lock sleeve is in sliding sealing fit with the inner wall surface of the cylinder sleeve, the inner wall surface is in sealing fit with the outer wall surface of the lock ring seat, the lower end of the lock sleeve is in press fit with the top of the lower piston, the upper end of the lock sleeve is in thrust fit with the upper piston, and the central tube is provided with a pressure transfer channel communicated with the lower.

7. A composite packer as claimed in claim 6, in which the upper end of the lock sleeve is thrust fitted by being fixed to the upper piston.

8. A composite packer as claimed in claim 6, wherein the upper end of the lock ring seat is provided with an outwardly projecting collar at which the lock sleeve is in sliding sealing engagement with the lock ring seat.

9. A composite packer as set forth in claim 6, wherein the base pipe comprises a pipe portion and a lower sub connected to a lower end of the pipe portion, an upper end of the lower sub having a lower land, the cylinder liner being fixedly mounted on the lower land of the lower sub.

10. The composite packer as claimed in claim 1, wherein the central pipe comprises a pipe portion and an upper joint connected to an upper end of the pipe portion, and an upper end of the corrosion-resistant rubber barrel is attached to a lower end surface of the upper joint.