WO2021155613A1 - 一种可溶金属密封卡座 - Google Patents

一种可溶金属密封卡座 Download PDF

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Publication number
WO2021155613A1
WO2021155613A1 PCT/CN2020/074856 CN2020074856W WO2021155613A1 WO 2021155613 A1 WO2021155613 A1 WO 2021155613A1 CN 2020074856 W CN2020074856 W CN 2020074856W WO 2021155613 A1 WO2021155613 A1 WO 2021155613A1
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WO
WIPO (PCT)
Prior art keywords
slip
cone
gap
tooth
soluble metal
Prior art date
Application number
PCT/CN2020/074856
Other languages
English (en)
French (fr)
Inventor
曾琦军
Original Assignee
四川维泰科创石油设备制造有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN202010082860.XA external-priority patent/CN113250648B/zh
Application filed by 四川维泰科创石油设备制造有限公司 filed Critical 四川维泰科创石油设备制造有限公司
Publication of WO2021155613A1 publication Critical patent/WO2021155613A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/10—Slips; Spiders ; Catching devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/134—Bridging plugs

Definitions

  • the invention relates to the technical field of downhole tools in the petroleum and natural gas industry, in particular to a soluble metal seal holder.
  • the existing soluble card holder includes a cone 5 and a lower joint 1.
  • a rubber cylinder 4 and slips 2 are arranged between the cone 5 and the lower joint 1.
  • the existing soluble card holder has the following shortcomings:
  • the cone 5 of the existing soluble card holder is mostly a soluble metal member. Due to the limitation of the casing diameter in the well and the pressure bearing capacity of the cone 5 must be guaranteed, the thickness of the cone 5 is relatively thick.
  • the inside of the cone 5 is a cylindrical channel with a small aperture. For example, the diameter of the channel is 30mm-45mm, and the diameter of the channel cannot be made large, which greatly affects the flowback efficiency of fracturing fluid and impurities in the well, and then affects oil and gas. The effect of increasing production;
  • the slip 2 of the existing soluble card holder includes a slip holder 23 and a slip tooth 24.
  • the outer surface of the slip holder 23 is provided with a slip tooth groove, and the slip tooth groove is provided with
  • the slip seat 23 is mostly made up of several slip pieces 21, two adjacent slip pieces 21 are connected to each other, and there are preset slits 22, which is not only complicated in structure, but difficult to process, And during the downhole process, the slip sheet 21 is prone to damage, which affects the anchoring performance; except that there is a slit 22 at the end of the slip seat 23 abutting the rubber cylinder 4, so that the slips 2 are transferred to the rubber cylinder 4 The force is uneven, and the rubber cylinder 4 is easily damaged when the card seat is set.
  • the purpose of the present invention is to overcome the complicated structure of the slips on the soluble card seat in the prior art and the processing difficulties; the slips are easily damaged, which affects the anchoring performance of the slips; and the slips on the card seat are likely to cause damage to the rubber cylinder; In addition, the large size of the glue cylinder, the difficulty of dissolving and the poor sealing effect result in the complicated structure of the card holder, difficult processing, and poor sealing performance.
  • a soluble metal sealing card holder is provided.
  • a soluble metal seal holder comprising: a cone, a metal sealing ring, a slip and a lower joint, the cone, the metal sealing ring, the slip and the lower joint are all soluble metal components; the outer surface of the cone is Cone surface with axially arranged channels inside the cone;
  • the metal sealing ring is sleeved on the cone
  • the slip includes a plurality of slip tooth grooves and a cylindrical slip seat.
  • the slip seat is an integral structure.
  • One end of the slip seat has a plurality of tooth plates.
  • One end of the cone of the body is a plurality of slip tooth grooves and a cylindrical slip seat.
  • the cone, lower joint, slips, and metal sealing ring of the soluble metal seal holder of the present invention are all made of soluble metal, such as aluminum alloy or magnesium alloy, which can be dissolved in a liquid with corresponding salinity Metal.
  • the invention adopts a metal sealing ring for sealing, which solves the shortcomings of the large volume of the rubber cylinder and high dissolution conditions.
  • the metal sealing ring has the advantages of good dissolution performance and not easy to block the wellbore, and the metal sealing ring has better sealing performance than the rubber cylinder. , Ensuring the successful implementation of process technologies such as back-up testing and fracturing reformation.
  • the slips of the present invention adopts an integral structure of slip holders, and does not need to be assembled by multiple slip sheets, and does not need to be provided with slits, which greatly simplifies the structure of the slips, has the advantages of simple structure and easy processing, and During the downhole process, the integrated slip seat is not prone to damage, which improves the pressure bearing capacity and anchoring performance of the slip. Finally, only one end of the slip seat has a tooth plate, and there is a gap between the tooth plates.
  • the slip seat When the slip seat crawls on the slope of the cone, the slip seat has one end of the tooth plate for When abutting the lower joint, under the abutting force of the lower joint, the tooth plate on the slip seat will spread out, but will not break, until the tooth plate fits the inner wall of the sleeve, and the slip tooth It is inserted into the inner wall of the casing to achieve the anchoring function; its end without the tooth plate is used to abut the metal sealing ring, and the force transmission end surface does not have the gap, which can transmit uniform force to the metal sealing ring , To avoid the uneven force and damage of the metal sealing ring.
  • the size of the slip tooth matches the size of the corresponding slip tooth groove, and a part of the slip tooth is exposed outside the slip tooth groove for realizing the anchoring of the slip and the sleeve. Since the slip seat used in the present invention can evenly transmit force to the metal seal ring, the present invention does not need to set a baffle ring or composite sheet between the metal seal ring and the slips. The same applies after the baffle ring or composite sheet is removed. Sealing can be achieved, the structure of the card holder is greatly simplified, the overall length of the card holder is shortened, processing is very convenient, and the processing efficiency can be greatly improved.
  • the soluble metal sealing card seat of the present invention has simple structure, shortened length, convenient processing, and better sealing performance.
  • the gap includes a gap bottom and a gap neck
  • the gap bottom is a C-shaped groove
  • the gap neck is a strip groove
  • the opening at the gap bottom is connected to the gap neck
  • the gap The neck is arranged on a side close to the lower joint, and the width of the gap neck is smaller than the width of the bottom of the gap.
  • the bottom of the gap is a C-shaped groove, which can prevent the slip seat from being damaged due to concentrated stress.
  • the gap neck is a strip-shaped groove to facilitate the opening of the tooth plate, ensure the normal operation of the slip, and facilitate processing.
  • the width of the gap neck is 3-5 mm, and the width of the gap bottom is 3-5 times the width of the gap neck.
  • the slip seat uses the gap of the above-mentioned design value, the bottom of the gap can better avoid the damage of the slip seat due to the concentrated force, and the gap neck can facilitate the opening of the tooth plate on the slip seat and facilitate the anchoring of the slip It is located on the inner wall of the downhole casing and facilitates the processing of the gap neck.
  • the gap is arranged along the axial direction of the slip seat.
  • the end of the slip seat provided with the gap is forced along the axial direction to prevent the slip seat from being damaged.
  • the metal sealing ring is a metal member with an elongation rate of 16% to 35%.
  • the metal sealing ring is made of high elongation metal, and the high elongation metal refers to a metal with an elongation between 16% and 35%. Because the invention adopts high elongation metal, it can ensure that the metal sealing ring can produce sufficient deformation, thereby realizing the sealing of the card seat.
  • the metal component is a magnesium alloy component, or other soluble metal that can reach the elongation range, and the soluble metal refers to a metal that can be dissolved in a liquid with a corresponding salinity.
  • the slip seat and the metal sealing ring are integrally formed.
  • the slips and the sealing ring are designed as an integral structure, which makes the structure of the card seat simpler and more convenient for processing.
  • the through hole inside the slip seat has a funnel-shaped structure, and the funnel tube part of the funnel-shaped structure is located at one end of the tooth plate.
  • the funnel tube structure is divided into a funnel body part and a funnel tube part.
  • the end of the slip seat without the tooth plate is the funnel body part, which fits on the outer surface of the cone of the holder to increase the maximum contact support surface area .
  • the size of the funnel tube portion is smaller, and the thickness of the corresponding tooth plate is larger, which improves the pressure bearing capacity of the end of the slip seat with the gap.
  • the slip tooth is a columnar structure, the included angle between the outer end surface of the slip tooth and the axis of the slip seat is 10-60°, and the outer end surface of the slip tooth faces away from the The slip seat is provided with one end of the tooth plate.
  • the outer end surface refers to the surface of the slip tooth opposite to the bottom surface of the slip tooth groove. This surface has an inclination angle with the axis of the slip seat to form an inclined surface, which reduces the slip tooth
  • the contact area with the sleeve enhances the ability of the slip teeth to squeeze into the sleeve, so that the anchoring ability of the soluble integral slip is better.
  • the slip seat includes 6-12 tooth plates, and 2-3 slip tooth grooves are evenly arranged on the tooth plate.
  • all the slip grooves on each tooth plate are arranged along the axial direction of the slip seat.
  • the number of the slip teeth can be changed according to the force and design requirements.
  • the slip tooth grooves are evenly arranged on the tooth plate, that is, the slip teeth are evenly arranged on the tooth plate.
  • the tooth plate is forced to expand, the slip teeth are better anchored In the casing, the anchoring effect of slips is better.
  • the gap is a U-shaped groove or an arc-shaped groove, and can also be a semicircular opening, etc., so as to prevent the slip seat from being damaged by concentrated force.
  • the slip teeth are ceramic components or ceramic metal components.
  • the axis of the slip seat is coaxial with the axis of the inner through hole.
  • the slips When the slips are installed on the bottom end of the cone, the slips are made symmetrical along the central axis of the cone. When the clamping seat is set, all the slip teeth can contact the sleeve at the same time, and the anchoring effect is better. .
  • the channel has a cylindrical structure, and the channel diameter is 70-80 mm; or the channel is a truncated cone-shaped structure, and the smallest end of the channel has a diameter of 70-80 mm.
  • the channel size of the cone is enlarged, and the flowback efficiency of fracturing fluid and impurities in the well is increased.
  • the size of the truncated channel is larger than that of the cylindrical channel, and the flowback effect is better.
  • At least one sealing ring is provided on the metal sealing ring, and the sealing ring is used for auxiliary sealing.
  • the soluble metal seal holder of the present invention adopts a metal seal ring for sealing, which solves the shortcomings of the large volume of the rubber cylinder and high dissolution conditions.
  • the metal seal ring has the advantages of good dissolution performance and not easy to block the wellbore. Compared with the rubber cylinder, the sealing ring has better sealing performance, which guarantees the successful implementation of process technologies such as back-up testing and fracturing modification.
  • the slips of the soluble metal seal holder of the present invention adopts the slip holder of an integrated structure, which does not need to be assembled by multiple slip pieces, and does not need to be provided with slits, which greatly simplifies the structure of the slips and has It has the advantages of simple structure and easy processing, and during the downhole process, the integrated slip seat is not easy to be damaged, which improves the pressure bearing capacity and anchoring performance of the slip.
  • the slip holder used in the soluble metal seal holder of the present invention has a tooth plate at one end abutting on the lower joint, which is convenient for being opened by the action of the lower joint, and is convenient for the slips on it to be anchored to the sleeve.
  • the inner wall of the pipe, and the end of the tube without the tooth plate is used to abut the metal sealing ring, and the force transmission end surface has no such gap, which can transmit uniform force to the metal sealing ring, avoiding the force of the metal sealing ring Uneven and damaged.
  • the slip seat used in the soluble metal seal holder of the present invention abuts on one end of the metal seal ring, it can evenly transmit the force to the metal seal ring, so the present invention does not need to connect the metal seal ring and the card.
  • a baffle ring or composite sheet is arranged between the tiles, and sealing can also be achieved after the baffle ring or composite sheet is eliminated, which greatly simplifies the structure of the card seat, and the entire card seat is shortened, which is very convenient for processing and can greatly improve the processing efficiency.
  • the size of the inner channel of the cone used in the soluble metal sealing clamp of the present invention is much larger than the aperture of the original cone through hole, which improves the flow-back efficiency of fracturing fluid and impurities in the well.
  • Figure 1 is a schematic diagram of the structure of an existing card holder
  • Figure 2 is a schematic diagram of the structure of an existing slip
  • Fig. 3 is a first structural diagram of the soluble metal sealing card seat in embodiment 1 of the present invention.
  • Figure 4 is a cross-sectional view at A-A in Figure 3;
  • Figure 5 is a three-dimensional structural view of slips in embodiment 1 of the present invention.
  • Fig. 6 is a schematic structural diagram of slips in embodiment 1 of the present invention from another perspective;
  • Fig. 7 is a first structural diagram of the slip seat in embodiment 1 of the present invention.
  • Figure 8 is a cross-sectional view at B-B in Figure 7;
  • FIG. 9 is a second structural diagram of the soluble metal seal holder in Embodiment 1 of the present invention.
  • Fig. 10 is a second structural diagram of the slip seat in embodiment 1 of the present invention.
  • Fig. 11 is a cross-sectional view at C-C in Fig. 10.
  • a soluble metal seal holder includes: a cone 5, a metal sealing ring 6, a slip 2 and a lower joint 1.
  • the cone 5, a metal sealing ring 6, and a slip 2 and the lower joint 1 are both soluble metal members;
  • the cone 5 is an aluminum alloy member, the outer surface of which is a cone surface, the end of the cone 5 with a larger diameter is a cone bottom, and the cone 5 has a smaller diameter One end is the top of the cone.
  • the inner part of the cone 5 is provided with a straight cylindrical channel along the axial direction, and the channel is used to fit the setting tool, and the diameter of the channel is 70-80mm; or the inner part of the cone 5 is a truncated cone.
  • the smallest end of the channel has a diameter of 70-80mm, and the above-mentioned channels are much larger than the hole diameter of the original cone 5, which improves the flowback efficiency of fracturing fluid and impurities in the well.
  • the truncated truncated channel is used. Compared with the straight cylindrical channel, the truncated truncated channel has a variable diameter and the smallest diameter is 70-80mm, which ensures the basic pressure-bearing capacity of the cone 5. Under the premise of, the size of the internal channel of the cone 5 is increased, which facilitates the flowback of fracturing fluid and impurities in the well.
  • the metal sealing ring 6 is sleeved on the cone 5 and installed at one end close to the cone bottom of the cone 5.
  • the inner surface of the metal sealing ring 6 is opposite to the outer cone surface of the cone 5.
  • the radial cross section of the outer surface of the metal sealing ring 6 is a plane.
  • the metal sealing ring 6 is made of high elongation metal, which refers to a metal with an elongation between 16% and 35%.
  • the high elongation metal It is a magnesium alloy or other soluble metal that can reach the elongation range.
  • the soluble metal means that it can be dissolved in a liquid with a corresponding degree of salinity.
  • the invention adopts the metal sealing ring 6 for sealing, which solves the shortcomings of the large volume of the rubber cylinder and high dissolution conditions.
  • the metal sealing ring 6 has the advantages of good dissolving performance and not easy to block the wellbore. Compared with the rubber cylinder, the metal sealing ring 6 has the advantages of sealing Better performance ensures the successful implementation of process technologies such as back-to-back testing and fracturing modification.
  • the metal sealing ring 6 is provided with at least one sealing ring 61, the sealing ring 61 is used for auxiliary sealing, and the sealing ring 61 can be a metal sealing ring 61 or a rubber sealing ring 61. .
  • the slip 2 includes a slip seat 23, and the slip seat 23 is an integrally formed cylindrical structure with a variable inner diameter.
  • the slip seat 23 is sleeved on the cone 5, one end of the slip seat 23 is in contact with the metal sealing ring 6, and the other end of the slip seat 23 is in contact with the lower joint 1.
  • the inner surface of the slip seat 23 is an inner cone surface that matches the outer cone surface of the cone 5.
  • the slip seat 23 of the slip 2 used in the present invention is an integrated structure, and there is no need to set multiple slip pieces and slits, which greatly simplifies the structure of the slip 2 and has the advantages of simple structure and easy processing. In the process, the integrated slip seat 23 is not prone to damage, which improves the anchoring performance.
  • the slip seat 23 used in the present invention can evenly transmit force to the metal seal ring 6, the present invention does not need to provide a baffle ring or a composite sheet between the metal seal ring 6 and the slips 2, which is eliminated. Sealing can also be achieved after the retaining ring or the composite sheet, which greatly simplifies the structure of the card seat, and shortens the overall length of the card seat, which is very convenient for processing and can greatly improve the processing efficiency.
  • the slip 2 includes a cylindrical slip seat 23, which is made of a soluble material, such as magnesium alloy or aluminum alloy, which can be mineralized in the underground. It can be dissolved in a liquid with a high temperature, and it can meet the overall pressure-bearing capacity of the slip 2.
  • the slip holder 23 is provided with a through hole along its axis. The through hole is used to adapt the cone 5 of the holder. The bottom, the end with the smaller outer diameter.
  • the through hole inside the slip holder 23 is a funnel-shaped structure, see Figure 11, the funnel tube structure is divided into a funnel body part and The funnel tube part, the funnel tube part of the funnel-shaped structure is provided at the end of the slip seat 23 where the tooth plate 231 is provided, and the end of the slip seat 23 that is not provided with the tooth plate 231 is a funnel body Part, which fits on the outer surface of the cone 5 of the holder, increasing the maximum contact support surface area.
  • the size of the funnel tube portion is smaller, and the thickness of the corresponding tooth plate 231 is larger, which improves the pressure bearing capacity of the end of the slip seat 23 where the gap 232 is provided.
  • the through holes inside the slip holder 23 shown in FIGS. 5-8 can also be a funnel-shaped structure as shown in FIG. 11.
  • One end of the slip seat 23 has a plurality of tooth plates 231. Specifically, there are 6-12 tooth plates 231 on the slip seat 23. In this embodiment, there are a total of 8 tooth plates 231. , The eight tooth plates 231 are evenly distributed along the circumferential direction of the slip seat 23, and there is a gap 232 between two adjacent tooth plates 231, and the opening of the gap 232 is provided in the slip seat 23 And the gap 232 is arranged along the axis of the slip seat 23. Specifically, referring to FIGS.
  • the gap 232 includes a gap bottom 238 and a gap neck 239, and the gap bottom 238 is C
  • the gap neck 239 is a strip-shaped groove
  • the opening of the gap bottom 238 communicates with the gap neck 239
  • the gap neck 239 is arranged on the side close to the lower joint 1.
  • the size of the gap neck 239 is smaller than the size of the gap bottom 238.
  • the width of the gap neck 239 is 3 to 5 mm
  • the width of the gap bottom 238 is 3 to the width of the gap neck 239. 5 times.
  • the bottom of the gap 238 is a C-shaped groove, which can prevent the slip seat 23 from being damaged due to concentrated force.
  • the gap neck 239 is a strip-shaped groove to facilitate the opening of the tooth plate 231 and ensure the normal operation of the slip 2. And easy to process.
  • the gap 232 can also be a U-shaped groove or an arc-shaped groove, and can also be a semicircular opening, etc., so as to prevent the slip seat 23 from being damaged by concentrated force.
  • a number of slip tooth grooves 233 are provided on the outer wall of the slip seat 23. Specifically, 2-3 slip tooth grooves 233 are evenly provided on the tooth plate 231, and each of the slip tooth grooves 233 There is one slip tooth 24.
  • each tooth plate 231 is provided with three slip tooth grooves 233 along the axial direction of the slip seat 23,
  • the slip tooth groove 233 is provided with a slip tooth 24, the size of the slip tooth 24 matches the size of the corresponding slip tooth groove 233, and a part of the slip tooth 24 is exposed
  • the outside of the slip tooth groove 233 is used to realize the anchoring of the slip 2 and the sleeve.
  • the slip tooth 24 is a cylindrical ceramic member or a ceramic metal member.
  • the slip tooth 24 is a cylindrical ceramic metal member.
  • the included angle of the axis of the shoe seat 23 is less than or equal to 60°, and the outer end surface of the slip tooth 24 faces away from the end of the slip seat 23 where the tooth plate 231 is provided.
  • the outer end surface refers to the
  • the bottom surface of the slip tooth 24 opposite to the bottom surface of the slip tooth groove 233 has an inclination angle with the axis of the slip seat 23 to form an inclined surface, which reduces the gap between the slip tooth 24 and the sleeve.
  • the contact area between the two strengthens the ability of the slip teeth 24 to squeeze into the sleeve, and makes the anchoring ability of the soluble integral slip 2 better.
  • the soluble metal seal holder assembled by using the slip holder 23 shown in FIG. 10 is as shown in FIG. 9, and each slip holder 23
  • Two slip tooth grooves 233 are provided on the tooth plate 231 along the axial direction of the slip seat 23, and each slip tooth groove 233 is provided with one slip tooth 24.
  • the number of slip teeth 24 to be adapted is designed on the tooth plate 231 to save cost.
  • Only one end of the slip seat 23 has a tooth plate 231, and there is a gap 232 between the tooth plates 231.
  • the slip seat 23 crawls on the slope of the cone 5, the slip seat 23 has the tooth
  • One end of the plate 231 is used to abut the lower joint 1, and under the abutment force of the lower joint 1, the tooth plate 231 on the slip seat 23 will be spread around but will not break until the tooth plate 231 is attached to the inner wall of the casing, and the slip teeth 24 are clamped into the inner wall of the casing to achieve an anchoring function; its end without the tooth plate 231 is used to abut against the metal sealing ring 6, and its force transmission end surface is not
  • the gap 232 can transmit a uniform force to the metal sealing ring 6 and avoid the metal sealing ring 6 from being damaged due to uneven force.
  • the size of the slip tooth 24 matches the size of the corresponding slip tooth groove 233, and a part of the slip tooth 24 is exposed outside the slip tooth groove 233 for realizing the slip 2 and the
  • the slip seat 23 and the metal sealing ring 6 are integrally formed.
  • the slip 2 is made of the same material as the metal sealing ring 6, and the slip 2
  • the sealing ring is designed as an integral structure, which makes the structure of the card seat simpler and the processing is more convenient.
  • the lower joint 1 is installed at an end close to the cone top of the cone 5, the lower joint 1 is an aluminum alloy member, and the end of the lower joint 1 close to the cone bottom of the cone 5 abuts against the slips 2 has one end of the tooth plate 231, and the lower joint 1 is used for matching with a setting tool.
  • the end of the lower joint 1 abutting the slips 2 is uniformly provided with a number of positioning screws 11, and the positioning screws 11 facilitate uniform positioning of the gaps of the slips 2 232 location.
  • the soluble metal seal holder of the present invention needs to be used in conjunction with a setting tool.
  • the setting tool is connected to the lower joint 1.
  • the setting tool is used to place the holder at the corresponding position of the wellbore to be blocked.
  • the tool pulls the lower joint 1 to produce a relative displacement between the lower joint 1 and the cone 5, so that the metal sealing ring 6 and the slips 2 are deformed due to the extrusion, and the outer wall of the metal sealing ring 6 is in contact with the inside of the wellbore. Sealing, the slip 2 is deformed or broken and anchored on the inside of the wellbore.
  • the plugging device includes section one,
  • the first section is a soluble metal member, and the shape and size of the outer surface of the first section are respectively adapted to the shape and size of the inner surface of the cone 5.
  • the cylindrical channel adopts the cylindrical section one.
  • the truncated truncated channel corresponds to the conical or truncated truncated section for matching.
  • the truncated truncated channel has a larger size than the cylindrical channel, and the return effect is better.
  • the first section of the plugging device can enter the inside of the channel for plugging, achieving surface plugging with better plugging effect, and can support the cone 5 and share the bearing of the cone 5. To prevent the cone 5 from being damaged due to stress, the entire setting process is completed so far.

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Abstract

一种可溶金属密封卡座，包括：锥体(5)、金属密封环(6)、卡瓦(2)和下接头(1)，所述锥体(5)、金属密封环(6)、卡瓦(2)和下接头(1)均为可溶性金属构件；所述锥体(5)外表面为锥面，所述锥体(5)内部具有轴向设置的通道；所述金属密封环(6)套设在所述锥体(5)上；所述卡瓦(2)包括若干个卡瓦齿槽(233)和呈圆筒状的卡瓦座(23)，所述卡瓦座(23)为一体式结构，所述卡瓦座(23)的一端具有若干齿板(231)，相邻两个所述齿板(231)之间具有间隙(232)，所述卡瓦齿槽(233)中设有卡瓦齿(24)，所述卡瓦(2)套设在所述锥体(5)上，所述卡瓦(2)的一端抵接于所述金属密封环(6)靠近所述锥体(5)锥顶的一端；所述下接头(1)靠近所述锥体(5)锥底的一端抵接于所述卡瓦(2)具有所述齿板(231)的一端。所述可溶金属密封卡座，其结构简单，长度缩短，加工方便，且密封性能更好。

Description

一种可溶金属密封卡座 技术领域
本发明涉及石油天然气行业的井下工具技术领域，特别是一种可溶金属密封卡座。
背景技术
可溶卡座广泛应用于深层气井的封堵，为上返测试、压裂改造等工艺技术的成功实施提供了保障。如图1-2所示，现有的可溶卡座包括锥体5和下接头1，在锥体5和下接头1之间设有胶筒4和卡瓦2，且为了满足密封要求，在胶筒4和卡瓦2还需要设置挡环3或复合片，但在具体施工中，发现现有的可溶卡座存在以下不足：
(1)现有的可溶卡座大多采用胶筒4作为密封构件，存在体积大、溶解条件高、难以完全溶解以及施工后期经常造成井筒堵塞的不足，进而影响油井出油；且胶筒4具有流动特征，密封效果不甚理想；
(2)现有的可溶性卡座的锥体5大多为可溶性金属构件，因井内套管直径的限制，以及锥体5的承压能力必须得到保障，所以锥体5的厚度都比较厚，进而锥体5内部为孔径较小的圆柱状通道，如通道的直径为30mm-45mm，且通道的直径无法做大，这极大的影响压裂液和井内杂质的返排效率，进而影响油、气的增产效果；
(3)现有的可溶卡座的卡瓦2包括卡瓦座23和卡瓦齿24，所述卡瓦座23的外表面上设有卡瓦齿槽，所述卡瓦齿槽内设有所述卡瓦齿24，其卡瓦座23大多由若干个卡瓦片21箍成，相邻两个卡瓦片21相互连接，且预设有切缝22， 不仅结构复杂，加工困难，且在下井过程中，卡瓦片21容易发生损坏，影响锚定性能；除外，卡瓦座23抵接于胶筒4的一端存在切缝22，使卡瓦2传递至所述胶筒4的作用力不均匀，卡座坐封时容易导致胶筒4损坏。
发明内容
本发明的目的在于克服现有技术中可溶卡座上的卡瓦结构复杂，加工困难；卡瓦片容易损坏，影响卡瓦锚定性能；且卡座上的卡瓦容易致使胶筒损坏；以及胶筒体积大、难以溶解和密封效果差的不足，致使卡座的结构复杂，加工困难，密封性能不佳的问题，提供一种可溶金属密封卡座。
为了实现上述目的，本发明采用的技术方案为：
一种可溶金属密封卡座，包括：锥体、金属密封环、卡瓦和下接头，所述锥体、金属密封环、卡瓦和下接头均为可溶性金属构件；所述锥体外表面为锥面，所述锥体内部具有轴向设置的通道；
所述金属密封环套设在所述锥体上；
所述卡瓦包括若干个卡瓦齿槽和呈圆筒状的卡瓦座，所述卡瓦座为一体式结构，所述卡瓦座的一端具有若干齿板，相邻两个所述齿板之间具有间隙，所述卡瓦齿槽中设有卡瓦齿，所述卡瓦套设在所述锥体上，所述卡瓦的一端抵接于所述金属密封环靠近所述锥体锥顶的一端；
所述下接头靠近所述锥体锥底的一端抵接于所述卡瓦具有所述齿板的一端。
本发明所述可溶金属密封卡座的锥体、下接头、卡瓦、金属密封环均是可溶性金属制成，如：采用铝合金或镁合金，能够在相应矿化度的液体中能够溶 解的金属。本发明采用金属密封环进行密封，解决了胶筒体积大、溶解条件高的不足，金属密封环具有溶解性能好，不易堵塞井筒的优点，且金属密封环相较于胶筒，密封性能更好，保障了上返测试、压裂改造等工艺技术的成功实施。进一步的，本发明的卡瓦采用一体式结构的卡瓦座，无需通过多个卡瓦片组装，也无需设置切缝，大大简化了卡瓦的结构，具有结构简单，便于加工的优点，且在下井过程中，一体式的卡瓦座不容易发生损坏，提高了卡瓦的承压能力和锚定性能。最后，所述卡瓦座只有一端具有齿板，所述齿板间具有间隙，当卡瓦座在锥体的坡面上爬动时，所述卡瓦座具有所述齿板的一端用于抵接下接头，受下接头的抵接力作用，所述卡瓦座上的所述齿板会向四周撑开，但不会断裂，直至所述齿板贴合套管内壁，且卡瓦齿卡入套管内壁中，实现锚定功能；其未设有所述齿板的一端用于抵接金属密封环，其传力的端面没有所述间隙，能够传递均匀的作用力给金属密封环，避免了金属密封环受力不均匀而损坏。所述卡瓦齿的尺寸与对应的所述卡瓦齿槽的尺寸相匹配，所述卡瓦齿的一部分露出在所述卡瓦齿槽外，用于实现卡瓦与套筒的锚定。由于本发明采用的卡瓦座能够将力均匀的传递至所述金属密封环，本发明无需再在金属密封环和卡瓦之间设置挡环或复合片，在取消挡环或复合片后同样能实现密封，极大的简化了卡座的结构，卡座整体长度缩短，十分便于加工，可大大提高加工效率。本发明所述可溶金属密封卡座，其结构简单，长度缩短，加工方便，且密封性能更好。
优选的，所述间隙包含间隙底部和间隙颈部，所述间隙底部为C形槽，所述间隙颈部为条形槽，所述间隙底部的开口和所述间隙颈部连通，所述间隙颈部设置在靠近所述下接头的一侧，所述间隙颈部的宽度小于所述间隙底部的宽度。
间隙底部为C形槽，能够避免所述卡瓦座受力集中而损坏，间隙颈部为条 形槽，便于所述齿板的打开，保证卡瓦的正常工作，且便于加工。
优选的，所述间隙颈部的宽度为3-5mm，所述间隙底部的宽度为所述间隙颈部的宽度的3-5倍。
所述卡瓦座使用上述设计值的间隙，其间隙底部能够更好的避免卡瓦座因受力集中而破坏，同时间隙颈部能够方便卡瓦座上的齿板打开，便于卡瓦锚定于井下套管的内壁，且便于间隙颈部的加工。
优选的，所述间隙沿所述卡瓦座的轴向设置。
使卡瓦座设有所述间隙的一端沿轴线方向受力，避免所述卡瓦座被破坏。
优选的，所述金属密封环为延伸率16％～35％的金属构件。
所述金属密封环由高延伸率金属制作而成，所述高延伸率金属指延伸率介于16％-35％之间的金属。由于本发明采用了高延伸率金属，可保证金属密封环能产生足够的变形量，从而实现卡座的密封。
优选的，所述金属构件为镁合金构件，或其他可达到该延伸率范围内的可溶性金属，可溶性金属是指其在相应矿化度的液体中能够溶解的金属。
优选的，所述卡瓦座和所述金属密封环一体成型。
将卡瓦和密封环设计为一个整体结构，使卡座的结构更加简单，加工更加方便。
优选的，所述卡瓦座内部的通孔为漏斗状结构，所述漏斗状结构的漏斗管部分位于所述齿板的一端。
所述漏斗管结构分为漏斗体部分和漏斗管部分，所述卡瓦座未设有所述齿板的一端为漏斗体部分，其适配于卡座的锥体外表面，增加最大接触支撑表面 积。且所述漏斗管部分的尺寸较小，其对应的所述齿板的厚度就大，提高所述卡瓦座设有所述间隙的一端的承压能力。
优选的，所述卡瓦齿为柱状结构，所述卡瓦齿的外端面与所述卡瓦座的轴线的夹角为10-60°，且所述卡瓦齿的外端面背向所述卡瓦座设有所述齿板的一端。
所述外端面是指所述卡瓦齿上与所述卡瓦齿槽的槽底面相对的面，该面与所述卡瓦座的轴线有倾斜角，形成一个斜面，减小了卡瓦齿与套筒之间的接触面积，加强了卡瓦齿挤压进套筒的能力，使所述可溶的整体式卡瓦的锚定能力更好。
优选的，所述卡瓦座上包含6-12个所述齿板，所述齿板上均匀设置2-3个所述卡瓦齿槽。
优选的，每个所述齿板上的所有所述卡瓦齿槽沿所述卡瓦座轴向设置。
所述卡瓦齿的数量可根据受力和设计要求进行变动。将所述卡瓦齿槽均匀设置在所述齿板上，即所述卡瓦齿均匀设置在所述齿板上，当所述齿板受力张开时，所述卡瓦齿更好的锚定入套管中，卡瓦的锚定效果更好。
优选的，所述间隙为U形槽或弧形槽，也能够为半圆形开口等，避免所述卡瓦座受力集中而损坏。
优选的，所述卡瓦齿为陶瓷构件或陶瓷金属构件。
优选的，所述卡瓦座的轴线和其内部通孔的轴线共轴。
当卡瓦安装在锥体的底端时，使卡瓦沿锥体的中心轴线对称，在卡座坐封时，所有卡瓦齿能够同时与套筒接触，同时受力，锚定效果更好。
优选的，所述通道为圆柱状结构，所述通道直径为70-80mm；或所述通道 为圆台状结构，所述通道的最小端的直径为70-80mm。
通过将锥体的厚度减小，从而实现锥体的通道尺寸变大，使压裂液和井内杂质的返排效率变高圆台状的通道尺寸大于圆柱状通道尺寸，返排效果更好。
优选的，所述金属密封环上设有至少一圈密封圈，所述密封圈用于辅助密封。
综上所述，由于采用了上述技术方案，本发明的有益效果是：
(1)本发明所述的可溶金属密封卡座采用金属密封环进行密封，解决了胶筒体积大、溶解条件高的不足，金属密封环具有溶解性能好，不易堵塞井筒的优点，且金属密封环相较于胶筒，密封性能更好，保障了上返测试、压裂改造等工艺技术的成功实施。
(2)本发明所述的可溶金属密封卡座的卡瓦采用一体式结构的卡瓦座，无需通过多个卡瓦片组装，也无需设置切缝，大大简化了卡瓦的结构，具有结构简单，便于加工的优点，且在下井过程中，一体式的卡瓦座不容易发生损坏，提高了卡瓦的承压能力和锚定性能。
(3)本发明所述的可溶金属密封卡座采用的卡瓦座的抵接于下接头的一端具有齿板，便于受下接头作用而打开，便于其上的卡瓦齿锚定于套管内壁，同时其未设有所述齿板的一端用于抵接金属密封环，其传力的端面没有所述间隙，能够传递均匀的作用力给金属密封环，避免了金属密封环受力不均匀而损坏。
(4)由于本发明所述的可溶金属密封卡座采用的卡瓦座抵接于金属密封环的一端能够均匀的传递作用力至金属密封环，故本发明无需再在金属密封环和卡瓦之间设置挡环或复合片，在取消挡环或复合片后同样能实现密封，极大的 简化了卡座的结构，卡座整体缩短，十分便于加工，可大大提高加工效率。
(5)本发明所述的可溶金属密封卡座采用的锥体的内部通道的尺寸远远大于原先的锥体的通孔的孔径，提升了压裂液和井内杂质的返排效率。
附图说明
图1是现有卡座的结构示意图；
图2是现有卡瓦的结构示意图；
图1-2中标记：1-下接头；2-卡瓦；21-卡瓦片；22-切缝；23-卡瓦座；24-卡瓦齿；3-挡环；4-胶筒；5-锥体。
图3是本发明实施例1中的可溶金属密封卡座的结构示意图一；
图4是图3中A-A处剖视图；
图5是本发明实施例1中卡瓦的立体结构图；
图6是本发明实施例1中卡瓦的另一视角的结构示意图；
图7是本发明实施例1中卡瓦座的结构示意图一；
图8是图7中B-B处的剖视图；
图9是本发明实施例1中的可溶金属密封卡座的结构示意图二；
图10是本发明实施例1中卡瓦座的结构示意图二；
图11是图10中C-C处的剖视图。
图3-11中标记：1-下接头；11-定位螺钉；2-卡瓦；23-卡瓦座；24-卡瓦齿；231-齿板；232-间隙；233-卡瓦齿槽；238-间隙底部；239-间隙颈部；5-锥体； 6-金属密封环；61-密封圈。
具体实施方式
下面结合附图，对本发明作详细的说明。
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
实施例1
如图3、图4所示，一种可溶金属密封卡座，包括：锥体5、金属密封环6、卡瓦2和下接头1，所述锥体5、金属密封环6、卡瓦2和下接头1均为可溶性金属构件；所述锥体5为铝合金构件，其外表面为锥面，所述锥体5直径较大的一端为锥底，所述锥体5直径较小的一端为锥顶。所述锥体5内部沿轴向设有直柱状通道，所述通道用于和座封工具相适配，所述通道的直径为70-80mm；或所述锥体5的内部为圆台状所述通道，所述通道的最小端的直径为70-80mm，上述通道都远远大于原先的锥体5的通孔的孔径，提升了压裂液和井内杂质的返排效率。作为本实施例中的优选方案，采用圆台状所述通道，所述圆台状通道对比于直柱状通道，通道为变径，且最小的直径为70-80mm，保证锥体5的基本承压能力的前提下，提高了锥体5内部通道的尺寸大小，便于压裂液和井内杂质的返排。
所述金属密封环6套设在所述锥体5上，且安装在靠近所述锥体5锥底的一端，所述金属密封环6的内表面为与所述锥体5的外锥面相适配的内锥面，所述金属密封环6的外表面的径向截面为平面。所述金属密封环6由高延伸率金属制作而成，所述高延伸率金属指延伸率介于16％-35％之间的金属，作为一 个较优的实施方式，所述高延伸率金属为镁合金，或其他可达到该延伸率范围内的可溶性金属，所述可溶性金属是指其在相应矿化度的液体中能够溶解。本发明采用金属密封环6进行密封，解决了胶筒体积大、溶解条件高的不足，金属密封环6具有溶解性能好，不易堵塞井筒的优点，且金属密封环6相较于胶筒，密封性能更好，保障了上返测试、压裂改造等工艺技术的成功实施。作为一个较优的实施方式，所述金属密封环6上设有至少一圈密封圈61，所述密封圈61用于辅助密封，所述密封圈61能够采用金属密封圈61或橡胶密封圈61。
所述卡瓦2包括卡瓦座23，所述卡瓦座23为一体成型的变内径的圆筒结构。所述卡瓦座23套设在所述锥体5上，所述卡瓦座23的一端与所述金属密封环6抵接，所述卡瓦座23的另一端与所述下接头1相连接，所述卡瓦座23的内表面为与所述锥体5的外锥面相适配的内锥面。本发明采用的卡瓦2的卡瓦座23为一体式结构，无需再设置多个卡瓦片和切缝，大大简化了卡瓦2的结构，具有结构简单，便于加工的优点，且在下井过程中，一体式的卡瓦座23不容易发生损坏，提高了锚定性能。进一步的，由于本发明采用的卡瓦座23能够将力均匀的传递至所述金属密封环6，本发明无需再在金属密封环6和卡瓦2之间设置挡环或复合片，在取消挡环或复合片后同样能实现密封，极大的简化了卡座的结构，卡座整体长度缩短，十分便于加工，可大大提高加工效率。
如图5-8所示，所述卡瓦2包括呈圆筒状的卡瓦座23，所述卡瓦座23采用可溶性材料制成，如镁合金或铝合金，其能够在井下相应矿化度的液体中溶解，且其能够满足卡瓦2的整体承压能力，所述卡瓦座23的内部沿其轴线设有通孔，所述通孔用于适配卡座的锥体5的底部，即外径较小的一端。且所述通孔的轴线和所述卡瓦座23内部的轴线共轴，所述卡瓦座23内部的通孔为漏斗状结构，参见图11，所述漏斗管结构分为漏斗体部分和漏斗管部分，所述漏斗状结构的 漏斗管部分设在所述卡瓦座23设有所述齿板231的一端，所述卡瓦座23未设有所述齿板231的一端为漏斗体部分，其适配于卡座的锥体5外表面，增加最大接触支撑表面积。且所述漏斗管部分的尺寸较小，其对应的所述齿板231的厚度就大，提高所述卡瓦座23设有所述间隙232的一端的承压能力。其中图5-8所示的所述卡瓦座23内部的通孔也能够为图11所示的漏斗状结构。
所述卡瓦座23的一端具有若干齿板231，具体的，所述卡瓦座23上一共设有6-12个所述齿板231，本实施中，一共有8个所述齿板231，8个所述齿板231沿所述卡瓦座23周向均匀分布，且相邻两个所述齿板231之间具有间隙232，所述间隙232的开口设在所述卡瓦座23的端面上，且所述间隙232沿所述卡瓦座23的轴线设置，具体的，参见图5-8，所述间隙232包含间隙底部238和间隙颈部239，所述间隙底部238为C形槽，所述间隙颈部239为条形槽，所述间隙底部238的开口和所述间隙颈部239连通，所述间隙颈部239设置在靠近所述下接头1的一侧，所述间隙颈部239的尺寸小于所述间隙底部238的尺寸，具体的，所述间隙颈部239的宽度为3-5mm，所述间隙底部238的宽度为所述间隙颈部239的宽度的3-5倍。间隙底部238为C形槽，能够避免所述卡瓦座23受力集中而损坏，间隙颈部239为条形槽，便于所述齿板231的打开，保证所述卡瓦2的正常工作，且便于加工。其中，如图9-11所示，所述间隙232也能够为U形槽或弧形槽，还能够为半圆形开口等，避免所述卡瓦座23受力集中而损坏。
所述卡瓦座23外壁上设有若干个卡瓦齿槽233，具体的，所述齿板231上均匀设置2-3个所述卡瓦齿槽233，每个所述卡瓦齿槽233上设有一个卡瓦齿24，本实施例中，如图5-8所示，每个所述齿板231上沿所述卡瓦座23轴向设置有三个所述卡瓦齿槽233，且所述卡瓦齿槽233中设有一个卡瓦齿24，所述 卡瓦齿24的尺寸与对应的所述卡瓦齿槽233的尺寸相匹配，所述卡瓦齿24的一部分露出在所述卡瓦齿槽233外，用于实现卡瓦2与套筒的锚定。具体的，所述卡瓦齿24为柱状的陶瓷构件或陶瓷金属构件，本实施例中，所述卡瓦齿24为圆柱状陶瓷金属构件，所述卡瓦齿24的外端面与所述卡瓦座23的轴线的夹角小于或等于60°，且所述卡瓦齿24的外端面背向所述卡瓦座23设有所述齿板231的一端，所述外端面是指所述卡瓦齿24上与所述卡瓦齿槽233的槽底面相对的底面，该面与所述卡瓦座23的轴线有倾斜角，形成一个斜面，减小了卡瓦齿24与套筒之间的接触面积，加强了卡瓦齿24挤压进套筒的能力，使所述可溶的整体式卡瓦2的锚定能力更好。作为一个实施选择方式，如图9-11所示，采用图10所示的所述卡瓦座23来组装得到的所述可溶金属密封卡座如图9所示，每个卡瓦座23的齿板231上沿所述卡瓦座23的轴向设置有两个所述卡瓦齿槽233，每个所述卡瓦齿槽233中设有一个所述卡瓦齿24，根据实际锚定需求，在所述齿板231上设计适配的卡瓦齿24的数量，节约成本。
所述卡瓦座23只有一端具有齿板231，所述齿板231间具有间隙232，当卡瓦座23在锥体5的坡面上爬动时，所述卡瓦座23具有所述齿板231的一端用于抵接下接头1，受下接头1的抵接力作用，所述卡瓦座23上的所述齿板231会向四周撑开，但不会断裂，直至所述齿板231贴合套管内壁，且卡瓦齿24卡入套管内壁中，实现锚定功能；其未设有所述齿板231的一端用于抵接金属密封环6，其传力的端面没有所述间隙232，能够传递均匀的作用力给金属密封环6，避免了金属密封环6受力不均匀而损坏。所述卡瓦齿24的尺寸与对应的所述卡瓦齿槽233的尺寸相匹配，所述卡瓦齿24的一部分露出在所述卡瓦齿槽233外，用于实现卡瓦2与套筒的锚定。
作为一个较优的实施方式，所述卡瓦座23和所述金属密封环6为一体成型结构，此时，所述卡瓦2采用与所述金属密封环6相同的材料，将卡瓦2和密封环设计为一个整体结构，使卡座的结构更加简单，加工更加方便。
所述下接头1安装在靠近所述锥体5锥顶的一端，所述下接头1为铝合金构件，所述下接头1靠近所述锥体5锥底的一端抵接于所述卡瓦2具有所述齿板231的一端，所述下接头1用于和座封工具相适配。本实施例中，参见图9，所述下接头1抵接于所述卡瓦2一端的端部上均匀设有若干定位螺钉11，所述定位螺钉11方便均匀定位所述卡瓦2的间隙232的位置。
在使用时，本发明所述可溶金属密封卡座需要和座封工具配合使用，座封工具与下接头1相连接，利用座封工具将卡座放置在待堵塞井筒的相应位置，座封工具拉动下接头1，使得下接头1和锥体5之间产生相对位移，从而使得金属密封环6和卡瓦2由于挤压而产生变形，金属密封环6的外壁与井筒的内部接触并实现密封，卡瓦2发生变形或破裂而锚定在井筒内部上。当座封工具的推力达到一定值后，座封工具与下接头1脱落，座封工具取出，投入类似于可溶金属封堵球的可溶的封堵装置，所述封堵装置包括段一，所述段一为可溶性金属构件，所述段一外表面的形状和尺寸分别适配于所述锥体5内表面的形状和尺寸，例如：圆柱状所述通道采用圆柱状的所述段一，圆台状所述通道对应采用圆锥状或者圆台状所述段一进行匹配，圆台状的通道尺寸大于圆柱状通道尺寸，返排效果更好。所述封堵装置的段一能够进入所述通道的内部进行封堵，实现了面封堵，封堵效果更好，且能够对所述锥体5进行支撑，分担所述锥体5的承压，避免锥体5受力而损坏，至此完成整个座封过程。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发 明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种可溶金属密封卡座，其特征在于，包括：锥体(5)、金属密封环(6)、卡瓦(2)和下接头(1)，所述锥体(5)、金属密封环(6)、卡瓦(2)和下接头(1)均为可溶性金属构件；
    所述锥体(5)外表面为锥面，所述锥体(5)内部具有轴向设置的通道；
    所述金属密封环(6)套设在所述锥体(5)上；
    所述卡瓦(2)包括若干个卡瓦齿槽(233)和呈圆筒状的卡瓦座(23)，所述卡瓦座(23)为一体式结构，所述卡瓦座(23)的一端具有若干齿板(231)，相邻两个所述齿板(231)之间具有间隙(232)，所述卡瓦齿槽(233)中设有卡瓦齿(24)，所述卡瓦(2)套设在所述锥体(5)上，所述卡瓦(2)的一端抵接于所述金属密封环(6)靠近所述锥体(5)锥顶的一端；
    所述下接头(1)靠近所述锥体(5)锥底的一端抵接于所述卡瓦(2)具有所述齿板(231)的一端。
  2. 根据权利要求1所述的可溶金属密封卡座，其特征在于，所述间隙(232)包含间隙底部(238)和间隙颈部(239)，所述间隙底部(238)为C形槽，所述间隙颈部(239)为条形槽，所述间隙底部(238)的开口和所述间隙颈部(239)连通，所述间隙颈部(239)设置在靠近所述下接头(1)的一侧，所述间隙颈部(239)的宽度小于所述间隙底部(238)的宽度。
  3. 根据权利要求2所述的可溶金属密封卡座，其特征在于，所述间隙颈部(239)的宽度为3-5mm，所述间隙底部(238)的宽度为所述间隙颈部(239)的宽度的3-5倍。
  4. 根据权利要求2所述的可溶金属密封卡座，其特征在于，所述间隙(232) 沿所述卡瓦座(23)的轴向设置。
  5. 根据权利要求1-4任一所述的可溶金属密封卡座，其特征在于，所述金属密封环(6)为延伸率16％～35％的金属构件。
  6. 根据权利要求5所述的可溶金属密封卡座，其特征在于，所述金属构件为镁合金构件。
  7. 根据权利要求1-4任一所述的可溶金属密封卡座，其特征在于，所述卡瓦座(23)和所述金属密封环(6)一体成型。
  8. 根据权利要求1-4任一所述的可溶金属密封卡座，其特征在于，所述卡瓦座(23)上包含6-12个所述齿板(231)，所述齿板(231)上均匀设置2-3个所述卡瓦齿槽(233)。
  9. 根据权利要求1-4任一所述的可溶金属密封卡座，其特征在于，所述通道为圆柱状结构，所述通道直径为70-80mm；或所述通道为圆台状结构，所述通道的最小端的直径为70-80mm。
  10. 根据权利要求1-4任一所述的可溶金属密封卡座，其特征在于，所述金属密封环(6)上设有至少一圈密封圈(61)。
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