CN109162664B - Downhole metal packer and methods of making and using the same - Google Patents
Downhole metal packer and methods of making and using the same Download PDFInfo
- Publication number
- CN109162664B CN109162664B CN201811240846.7A CN201811240846A CN109162664B CN 109162664 B CN109162664 B CN 109162664B CN 201811240846 A CN201811240846 A CN 201811240846A CN 109162664 B CN109162664 B CN 109162664B
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- Prior art keywords
- wall
- packer
- metal
- annular container
- liquid
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
- E21B33/1212—Packers; Plugs characterised by the construction of the sealing or packing means including a metal-to-metal seal element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention relates to the technical field of underground packers in petroleum industry, which is applied to layered production of thermal recovery wells. The underground metal packer comprises a central pipe, wherein a closed annular container is sleeved on the periphery of the central pipe, the annular container is provided with an outer wall and an inner wall, the outer wall is made of ductile metal material, and liquid is filled in the annular container. The manufacturing steps include making the outer wall corrugated, filling liquid, etc. The method comprises the following steps: injecting high-temperature steam through a steam injection pipe column, determining the pressure in the packer through calculation or table lookup, determining the working pressure difference and the like. Because the packer is provided with the metal container and filled with liquid, the packer has no problem of ageing and failure of the sealing element, and has long sealing life and reliability.
Description
Technical Field
The invention relates to the technical field of underground packers of thermal recovery wells in petroleum industry, in particular to an underground metal packer and a manufacturing and using method thereof.
Background
In the development process of a thickened oil field, water injection steam thermal recovery is the most common development mode. In the steam injection process, the underground temperature can reach more than 300 ℃, and the temperature in the oil extraction process can also exceed 200 ℃. Packers using lead as a main sealing material are often used in oil wells, and the packers have low sealing pressure and short service life. In order to solve the problem, chinese patent application number 201520301800.7, application date 2015, 05 month and 12 days, and patent name of self-expansion type thermal open hole metal packer; in addition, chinese patent application No. 200720011858.3, filing date 2007, 04, 26, patent name "stopper", each of which discloses a packer seal with a metal outer shell and rubber inner core. The common disadvantage of this product is that the rubber core of the seal member quickly ages and hardens during steam injection, and the volume is reduced and the sealing capacity is lost.
Disclosure of Invention
In order to solve the technical problems, the invention discloses an underground metal packer, and solves the problem that a packer in the prior art adopts a nonmetallic sealing element such as rubber and the like to be easy to age and lose efficacy.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a metal packer in pit is prepared as sleeving closed ring-shaped container on periphery of central tube, setting outer wall and inner wall on ring-shaped container, filling liquid in ring-shaped container and setting ductile metal material on outer wall.
The central tube and the outer wall jointly form an annular container, and the outer surface of the central tube forms the inner wall of the annular container; one end or two ends of the outer wall are provided with baffle rings which are sleeved on the periphery of the central tube; the baffle ring, the central tube and the outer wall form an annular container together; one end or two ends of the annular container are provided with liquid storage chambers, the baffle ring is provided with a channel, and the liquid storage chambers are communicated with the inner cavity of the annular container through the channel; the outer wall is corrugated; the outer surface of the outer wall is attached with a soft metal attaching layer; the soft metal coating material is lead, lead alloy, aluminum alloy or red copper; the liquid is water or ethanol; the metal material is stainless steel, carbon steel, red copper, aluminum or aluminum alloy.
The method for manufacturing the underground metal packer comprises the following steps:
a. the metal outer wall is made into a corrugated shape by using a plate folding machine;
b. plating soft metal on the outer surface of the outer wall;
c. two ends of the outer wall are welded with the baffle ring and the liquid storage chamber into a whole and then sleeved on the periphery of the central tube;
d. the baffle ring or the liquid storage chamber is welded with the central tube to form a closed container;
e. and (3) arranging injection process holes on the baffle ring or the liquid storage chamber, injecting liquid into the annular container, and then closing the injection process holes.
The application method of the underground metal packer comprises the step of connecting the underground metal packer in an underground steam injection pipe column.
The application method of the underground metal packer comprises the following steps:
a. the underground metal packer is connected to the steam injection pipe column and is put into an underground designated position;
b. injecting high-temperature steam through a steam injection pipe column;
c. according to the temperature of the underground metal packer, the saturated vapor pressure of the liquid in the packer at the corresponding temperature is obtained through calculation or table lookup, and the pressure in the annular container of the underground metal packer is determined;
d. an operating pressure differential is applied to the downhole metal packer at a pressure less than the pressure value within the annular vessel.
The invention has the technical advantages that:
1. the underground metal packer is provided with a closed metal annular container with a ductile outer wall, liquid is filled in the container, and water or other liquid can be selectively filled according to the pressure requirement of working conditions. When steam is injected into the thermal production well, the downhole temperature can reach more than 300 ℃, and water is taken as an example, and the saturated vapor pressure of the water at 300 ℃ can reach 8.6MPa. The outer wall of the annular vessel of the packer expands to seal the oil jacket annulus at a pressure of 8.6MPa. Because the all-metal packer sealing element is adopted, and the saturated vapor pressure of liquid is used as a pressure source, the packer disclosed by the invention has the advantages that the aging failure problem of the sealing element can not occur, and the sealing life is long and reliable.
2. The soft metal attaching layer is attached to the outer surface of the outer wall of the annular container, so that the packer disclosed by the invention can be more suitable for the possibly rough working condition of the inner wall of the underground casing, and the sealing effect is better.
3. The liquid filling in the annular container of the packer can be selected, the corresponding liquid can be selected according to the sealing pressure requirement, and the range of applicable working conditions is wider.
4. The packer is provided with the liquid storage chamber, and more liquid is provided for the expansion of the annular container of the packer, so that the annular container of the packer can be designed to be longer, and the diameter of the outer wall of the annular container can be expanded to be larger.
Drawings
The invention, together with a further understanding of the many of its attendant advantages, will be best understood by reference to the following detailed description, when considered in conjunction with the accompanying drawings, which are included to provide a further understanding of the invention, and the accompanying drawings, illustrate and do not constitute a limitation on the invention, and wherein:
FIG. 1 is a schematic diagram of a first embodiment of a downhole metal packer.
FIG. 2 is a schematic diagram of a second embodiment of a downhole metal packer.
Fig. 3 is a cross-sectional view at A-A in fig. 2.
FIG. 4 is a schematic diagram of a downhole metal packer with a baffle ring at one end of the outer wall of the packer.
FIG. 5 is a schematic diagram of a downhole metal packer with retaining rings at both ends of the outer wall of the packer.
FIG. 6 is a schematic diagram of a downhole metal packer with a reservoir.
FIG. 7 is a schematic diagram of a downhole metal packer with a soft metal layer attached to the outer wall of the packer.
Fig. 8 is a cross-sectional view at B-B in fig. 7.
Detailed Description
As shown in figure 1, the underground metal packer disclosed by the invention is also provided with a central pipe 4 like other underground packers, a closed annular container 1 is sleeved on the periphery of the central pipe 4, the annular container is provided with an outer wall 5 and an inner wall 6, the outer wall 5 is made of a ductile metal material, and liquid 2 is filled in the annular container 1. Only the main part of the packer of the invention is shown in the figure, and the connection structures at the two ends of the central tube of the packer are not shown. The liquid 2 is liquid at normal temperature, the liquid 2 is in a vaporization state at high temperature, and the sleeve 3 is expanded and sealed on the outer wall of the annular container. The outer wall and the inner wall refer to the inner and outer wall in the radial direction, the outer wall in the large diameter and the inner wall in the small diameter.
Because the underground steam injection temperature of a thickened oil thermal production well can exceed 300 ℃, the oil production temperature can also exceed 200 ℃, and common nonmetallic materials such as rubber materials and the like can age rapidly, the sealing life of a packer is seriously influenced. The invention adopts an all-metal sealing element, namely a metal annular container, and expands and seals the annular space of the oil sleeve by taking the saturated vapor pressure of the filled liquid as a pressure source.
The liquid 2 is optionally filled in order to seal off different pressure conditions. The most common, most convenient to manufacture and least expensive is water, and the saturated vapor pressures of water at different temperatures are shown in table 1, and the temperature values in the table are rounded. Other liquids, such as ethanol, can also be used at the same temperature, with a saturated vapor pressure of 0.101MPa for water and 0.223MPa for ethanol, for higher sealing pressures at 100 ℃. Of course, other liquid charges such as alkanes, alkenes, benzenes, etc. may be further selected, and their saturated vapor pressures may be obtained by calculation or by look-up tables from the relevant literature.
TABLE 1 correspondence table of temperature and saturated vapor pressure of water
For easy expansion and also for better fitting of the outer wall 5 to the inner wall of the sleeve 3, the metallic material used for said outer wall 5 is preferably chosen to be ductile, such as stainless steel, mild steel, medium carbon steel, alloy steel, red copper, aluminum alloy, white iron, etc.
As shown in fig. 2 and 3, the central tube 4 and the outer wall 5 together form an annular container, and the outer surface of the central tube 4 forms the inner wall 6 of the annular container 1. To facilitate the manufacture of a closed container, the connection between the outer wall 5 and the central tube 4 is typically made using a welding method.
In order to improve the sealing capability of the packer of the invention and prevent the outer wall 5 from being damaged under high pressure difference, one end or two ends of the outer wall 5 are provided with baffle rings 7, and the baffle rings 7 are sleeved on the periphery of the central tube 4; the baffle ring 7, the central tube 4 and the outer wall 5 together form the annular container 1. Likewise, to facilitate the manufacture of a closed container, the connection between the baffle ring 7, the central tube 4 and the outer wall 5 is usually also welded.
Because of the small space in the casing downhole, the volume of the annulus formed between the central tube and the outer wall is small, and filling liquid in the annulus alone may not be sufficient to achieve saturated vapor pressure, requiring a supplemental liquid source. In order to solve the problem, a liquid storage chamber 8 is arranged on the packer, as shown in fig. 6, the liquid storage chamber 8 is arranged at one end or two ends of the annular container 1, a channel 9 is arranged on the baffle ring 7, and the liquid storage chamber 8 is communicated with the inner cavity of the annular container 1 through the channel 9.
To facilitate expansion of the outer wall, the outer wall 5 may be corrugated, or corrugated, the corrugated or corrugated shape shown in fig. 8 being a cross-section, the shape of which expands axially.
As shown in fig. 7, a soft metal attachment layer 10 is attached to the outer surface of the outer wall 5. The soft metal coating material is lead, lead alloy, aluminum alloy or red copper. The soft metal attachment layer may be machined on the outer surface of the outer wall 5 by electroplating, electroless plating or the like. The purpose of setting up this additional layer is favorable to the outer wall to laminate the sleeve pipe inner wall better, more can adapt to the possibly rough operating mode of sleeve pipe inner wall in the pit, improves sealing performance.
Figures 1-6 show the outer wall in an expanded condition, with vaporization of the fluid in the packer. The condition shown in fig. 7 and 8 is when the outer wall is not expanded, and the packer annulus and the fluid in the reservoir have not yet vaporized.
As a preferred embodiment, the method for manufacturing the downhole metal packer shown in FIG. 7 comprises the following steps:
a. the metal outer wall 5 is made into a corrugated shape by using a plate folding machine;
b. the outer surface of the outer wall 5 is plated with soft metal;
c. two ends of the outer wall 5 are welded with the baffle ring 7 and the liquid storage chamber 8 into a whole and then sleeved on the periphery of the central tube 4;
d. the baffle ring 7 or the liquid storage chamber 8 is welded with the central tube 4 to form a closed container;
e. an injection process hole is formed in the baffle ring 7 or the liquid storage chamber 8, liquid is injected into the annular container 1, and then the injection process hole is closed.
The sealing mode of the injection process hole needs to be properly selected according to the injection liquid, if the liquid is water, the sealing can be performed by a welding method. If the injected liquid is ethanol, the liquid can be sealed by a metal blind plug with sealing threads, and then the liquid is sealed by welding.
The application method of the underground metal packer is that the underground metal packer is connected in an underground steam injection pipe column. The method comprises the following steps:
a. the underground metal packer is connected to the steam injection pipe column and is put into an underground designated position;
b. injecting high-temperature steam through a steam injection pipe column;
c. according to the temperature of the underground metal packer, the saturated vapor pressure of the liquid in the packer at the corresponding temperature is obtained through calculation or table lookup, and the pressure in the annular container 1 of the underground metal packer is determined;
d. an operating pressure differential is applied to the downhole metal packer at a pressure less than the pressure value within the annular vessel 1.
In the oilfield operation process link, an operation design book is first provided, the operation design book is provided with the installation depth of the underground packer, and the underground designated position refers to the installation depth of the underground packer in the operation design book.
The saturated vapor pressure of a liquid may be obtained by calculation, such as by using the Antoine formula, or by looking up a correlation chart. Formulas or charts can be looked up from the relevant literature.
It will be apparent that many modifications and variations are possible within the scope of the invention, as will be apparent to those skilled in the art based upon the teachings herein.
Claims (7)
1. The underground metal packer comprises a central pipe (4), and is characterized in that a closed annular container (1) is sleeved on the periphery of the central pipe (4), the annular container is provided with an outer wall (5) and an inner wall (6), the outer wall (5) is made of a ductile metal material, and liquid (2) is filled in the annular container (1); the central tube (4) and the outer wall (5) jointly form an annular container (1), and the outer surface of the central tube (4) forms an inner wall (6) of the annular container (1); one end or two ends of the outer wall (5) are provided with baffle rings (7), and the baffle rings (7) are sleeved on the periphery of the central tube (4); the baffle ring (7), the central tube (4) and the outer wall (5) form an annular container (1); one end or two ends of the annular container (1) are provided with liquid storage chambers (8), the baffle ring (7) is provided with a channel (9), and the liquid storage chambers (8) are communicated with the inner cavity of the annular container (1) through the channel (9).
2. A downhole metal packer according to claim 1, wherein the outer wall (5) has a cross-section in the form of a chamfer, which chamfer extends axially.
3. A downhole metal packer according to claim 2, wherein the outer surface of the outer wall (5) is attached with a soft metal coating (10), the soft metal coating material being lead, lead alloy, aluminum alloy or red copper.
4. A downhole metal packer according to any one of claims 1-3, wherein the liquid (2) is water or ethanol.
5. A downhole metal packer according to any of claims 1-3, wherein the metal material is stainless steel, carbon steel, red copper, aluminium or an aluminium alloy.
6. A method of manufacturing a downhole metal packer according to any one of claims 3-5, comprising the steps of: a. the metal outer wall (5) is made into a corrugated shape by using a plate folding machine; b. the outer surface of the outer wall (5) is plated with soft metal; c. two ends of the outer wall (5) are welded with the baffle ring (7) and the liquid storage chamber (8) into a whole and then sleeved on the periphery of the central tube (4); d. the baffle ring (7) or the liquid storage chamber (8) is welded with the central tube (4) to form a closed container; e. an injection process hole is formed in the baffle ring (7) or the liquid storage chamber (8), liquid is injected into the annular container (1), and then the injection process hole is closed.
7. A method of using a downhole metal packer according to any one of claims 1-5, wherein the downhole metal packer is connected to a downhole steam injection string, comprising the steps of: a. the underground metal packer is connected to the steam injection pipe column and is put into an underground designated position; b. injecting high-temperature steam through a steam injection pipe column; c. according to the temperature of the underground metal packer, the saturated vapor pressure of the liquid in the packer at the corresponding temperature is obtained through calculation or table lookup, and the pressure in the annular container (1) of the underground metal packer is determined; d. an operating pressure differential is applied to the downhole metal packer at a pressure less than the pressure value within the annular vessel (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811240846.7A CN109162664B (en) | 2018-10-24 | 2018-10-24 | Downhole metal packer and methods of making and using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811240846.7A CN109162664B (en) | 2018-10-24 | 2018-10-24 | Downhole metal packer and methods of making and using the same |
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| Publication Number | Publication Date |
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| CN109162664A CN109162664A (en) | 2019-01-08 |
| CN109162664B true CN109162664B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811240846.7A Active CN109162664B (en) | 2018-10-24 | 2018-10-24 | Downhole metal packer and methods of making and using the same |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078793U (en) * | 1990-10-24 | 1991-06-12 | 辽河石油勘探局钻采工艺研究院 | Thermal expansion packer |
| CN103732851A (en) * | 2011-08-31 | 2014-04-16 | 韦尔泰克有限公司 | Annular barrier with compensation device |
| WO2017104563A1 (en) * | 2015-12-15 | 2017-06-22 | 帝石削井工業株式会社 | Packer |
| CN209212203U (en) * | 2018-10-24 | 2019-08-06 | 中国石油化工股份有限公司 | Underground metal packer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2191249C2 (en) * | 2000-07-03 | 2002-10-20 | Институт горного дела - научно-исследовательское учреждение СО РАН | Packer and method of its locking in well |
-
2018
- 2018-10-24 CN CN201811240846.7A patent/CN109162664B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078793U (en) * | 1990-10-24 | 1991-06-12 | 辽河石油勘探局钻采工艺研究院 | Thermal expansion packer |
| CN103732851A (en) * | 2011-08-31 | 2014-04-16 | 韦尔泰克有限公司 | Annular barrier with compensation device |
| WO2017104563A1 (en) * | 2015-12-15 | 2017-06-22 | 帝石削井工業株式会社 | Packer |
| CN209212203U (en) * | 2018-10-24 | 2019-08-06 | 中国石油化工股份有限公司 | Underground metal packer |
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| Publication number | Publication date |
|---|---|
| CN109162664A (en) | 2019-01-08 |
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