WO2024040786A1 - 双级密封式金属可溶桥塞 - Google Patents

双级密封式金属可溶桥塞 Download PDF

Info

Publication number
WO2024040786A1
WO2024040786A1 PCT/CN2022/136060 CN2022136060W WO2024040786A1 WO 2024040786 A1 WO2024040786 A1 WO 2024040786A1 CN 2022136060 W CN2022136060 W CN 2022136060W WO 2024040786 A1 WO2024040786 A1 WO 2024040786A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
cone
section
bridge plug
sealing ring
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2022/136060
Other languages
English (en)
French (fr)
Inventor
张国田
张勇
陈省身
王方明
王兴燕
陈晓军
李兴杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
CNPC Engineering Technology R&D Co Ltd
Beijing Petroleum Machinery Co Ltd
Original Assignee
China National Petroleum Corp
CNPC Engineering Technology R&D Co Ltd
Beijing Petroleum Machinery Co Ltd
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.)
Filing date
Publication date
Application filed by China National Petroleum Corp, CNPC Engineering Technology R&D Co Ltd, Beijing Petroleum Machinery Co Ltd filed Critical China National Petroleum Corp
Publication of WO2024040786A1 publication Critical patent/WO2024040786A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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
    • E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
    • 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
    • E21B33/1291—Packers; Plugs with mechanical slips for hooking into the casing anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks
    • E21B33/1292—Packers; Plugs with mechanical slips for hooking into the casing anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks with means for anchoring against downward and upward movement
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/08—Down-hole devices using materials which decompose under well-bore conditions

Definitions

  • the invention relates to the field of downhole tools for oil and natural gas drilling and fracturing, specifically a double-stage sealed metal soluble bridge plug.
  • layered injection and production and multi-stage segmented fracturing are one of the effective methods for the development of special oil layers.
  • bridge plugs are used to seal the downhole casing and isolate the target section.
  • the soluble bridge plug is a new type of layered and segmented transformation tool for shale gas fracturing. After fracturing, the bridge plug body can be completely dissolved depending on the wellbore temperature and a certain salinity liquid environment, ensuring that the wellbore is fully Through-diameter production has the advantages of low overall cost, short production time, reduced operating risks and the possibility of secondary transformation.
  • bridge plugs have evolved from cast iron drillable bridge plugs and composite drillable bridge plugs to soluble bridge plugs; most of the current common soluble bridge plugs are elastically deformed by extrusion of soluble rubber barrels to achieve downhole casing sealing and layer isolation.
  • the metal parts of the soluble bridge plug can be better dissolved under certain conditions of temperature and salinity underground, and eventually become powdery or fine granular dissolved residues, while the soluble collet mainly degrades into lumpy residues , not only the dissolution speed is slow and the cycle is long, but as the number of inserted bridge plugs increases, the accumulation of dissolved residues affects flowback production, which usually requires drilling and grinding operations, increasing costs.
  • soluble bridge plugs In addition, with the in-depth development of unconventional oil and gas reservoirs, there are higher requirements for the overall performance indicators and pressure and temperature grades of soluble bridge plugs, and they are constantly developing in the direction of high temperature resistance, high pressure, fast dissolution, and low residues. .
  • soluble rubber has certain deficiencies in terms of tolerance and sealing stability under high temperature conditions.
  • the present invention provides a two-stage sealed metal soluble bridge plug.
  • the two-stage sealed metal soluble bridge plug adopts a soluble metal sealing ring and is suitable for Under working conditions such as high temperature, high pressure, and high salinity, it achieves rapid dissolution of bridge plugs with less residue, ensuring rapid production of unconventional oil and gas wells and reducing construction cycles and economic costs.
  • a two-stage sealed metal soluble bridge plug including an inner and outer mandrel and a cone.
  • the outer surface of the cone contains an upper cone segment and a lower cone segment arranged up and down.
  • the top of the upper cone segment faces upward.
  • the bottom end is facing down, and the upper conical surface section outer cover is provided with an upper locking block ring and an upper metal sealing ring arranged up and down.
  • the top of the lower conical surface section faces downward and the bottom end is upward.
  • the lower conical surface section outer cover is provided with an upper and lower upper locking block ring.
  • the lower metal sealing ring and the anchor block ring are connected to the lower end of the mandrel with a throw-in joint.
  • the anchor block ring and the throw-in joint are connected up and down.
  • the cone can also move downward relative to the mandrel, and the upper locking block ring, upper metal sealing ring, lower metal sealing ring and anchoring block ring can all expand radially.
  • the double-stage sealed high-temperature and high-pressure resistant all-metal soluble bridge plug adopts symmetrically distributed wedge-type metal seal rings and support rings to form a double-stage sealing structure, which can increase the effective sealing area.
  • the sealing pressure-bearing reliability and stability of the all-metal soluble bridge plug improves its adaptability to complex working conditions at the bottom of the well and effective sealing and pressure-bearing working time, ensuring pressure Smooth construction of the cracking operation; and the overall structure of the all-metal soluble bridge plug is simple and novel; it has the technical characteristics of large passage, high pressure resistance, strong sealing and pressure-bearing stability, fast dissolution, and less residue; in the segmented pressure It can be quickly dissolved after cracking construction, allowing the well to be opened and put into production, thus reducing the construction cycle and economic costs.
  • Figure 1 is a schematic diagram of a two-stage sealed metal soluble bridge plug according to the present invention.
  • Figure 2 is a schematic diagram of the setting and anchoring working state of the double-stage sealed metal soluble bridge plug according to the present invention.
  • Figure 3 is a schematic diagram of the mandrel.
  • Figure 4 is a schematic diagram of a cone.
  • Figure 5 is a schematic diagram of the push ring.
  • Figure 6 is a schematic diagram of the upper locking block.
  • Figure 7 is a schematic diagram of the first support ring.
  • Figure 8 is a schematic diagram of an anchor block group ring.
  • Push cylinder 2. Mandrel; 3. Limiting screw; 4. Push ring; 5. Outer hoop; 6. Upper locking block ring; 7. Anchor teeth; 8. Limiting hoop; 9 , Upper metal sealing ring; 10. First support ring; 11. Second support ring; 12. Cone; 13. Anchor block ring; 14. Lost joint; 15. Lower metal sealing ring; 16. Casing ; 17. Soluble balls;
  • Anchor block 1301. Anchor block; 1302. Lower guide groove;
  • a two-stage sealed metal soluble bridge plug includes an inner and outer mandrel 2 and a cone 12.
  • the outer surface of the cone 12 contains an upper cone section 1201 and a lower cone section 1202 arranged up and down.
  • the upper cone section Both the section 1201 and the lower cone section 1202 are conical surfaces.
  • the top of the upper cone section 1201 faces upward and the bottom end faces down (that is, the upper end outer diameter of the upper cone section 1201 is smaller than the lower end outer diameter).
  • the upper cone section 1201 is coated
  • the top of the lower cone segment 1202 faces downward and the bottom end faces upward (that is, the lower end outer diameter of the lower cone segment 1202 is smaller than the upper end outer diameter).
  • the outer cover of the tapered section 1202 is provided with a lower metal sealing ring 15 and an anchoring block group ring 13 arranged up and down.
  • the lower end of the mandrel 2 is connected with a throw-in joint 14, and the anchor block group ring 13 and the throw-in joint 14 are connected up and down.
  • the cone 12 can also move downward relative to the mandrel 2.
  • the upper locking block assembly ring 6, the upper metal sealing ring 9, and the lower metal seal Both the ring 15 and the anchor block group ring 13 are capable of radial expansion, as shown in Figures 1 to 8.
  • the double-stage sealed metal soluble bridge plug also includes a trial assembly for bridge plug setting: a push cylinder 1 and a limit screw 3.
  • the push cylinder 1 and the push ring 4 are connected through the limit screw 3.
  • the upper metal sealing ring 9 and the lower metal sealing ring 15 are symmetrically installed outside the upper and lower ends of the cone 12 to form a combined two-stage metal sealing structure.
  • Each component of the two-stage sealing metal soluble bridge plug is rotated in sequence. They are installed on both ends of the cone 12 and cooperate with each other; and the whole body is installed on the mandrel 2.
  • the internal thread of the hand joint 14 is connected to the external thread of the lower end of the mandrel 2 to achieve axial positioning and locking.
  • the mandrel 2 is an upright tubular structure, and the outer surface of the mandrel 2 includes a first large diameter section 201, a second large diameter section 202, a first small diameter section 203 and a first small diameter section 203 arranged sequentially from top to bottom.
  • Two small diameter sections 204, the outer diameter of the first large diameter section 201, the outer diameter of the second large diameter section 202, the outer diameter of the first small diameter section 203 and the outer diameter of the second small diameter section 204 decrease in sequence
  • the cone 12 is An upright cylindrical structure
  • the upper cone section 1201 and the lower cone section 1202 are symmetrical up and down and are mirror images of each other, as shown in Figure 3.
  • the axis of the mandrel 2 coincides with the axis of the cone 12.
  • the upper end of the mandrel 2 is located outside the upper end of the cone 12.
  • the lower end of the mandrel 2 is located outside the lower end of the cone 12.
  • the first large diameter section 201 is provided with internal threads, and the cone 12 is mainly sleeved outside the first small diameter section 203.
  • the upper end of the cone 12 There is an annular conical seat cover 1203 inside.
  • the annular conical seat cover 1203 is a conical surface.
  • the top of the annular conical seat cover 1203 is downward and the bottom is upward.
  • the annular conical outer transition section 205 matches the annular conical seat cover 1203.
  • the second small diameter section 204 is sleeved in the throw joint 14 , the second small diameter section 204 is connected with the internal and external threads of the throw joint 14 , and the external threads of the second small diameter section 204 can cut off the internal threads of the throw joint 14 .
  • the mandrel 2 is made of alloy structural steel material.
  • the mandrel 2 is provided with a step-shaped through hole, and the first large diameter section 201 is provided with an internal thread for connection with a standard setting tool.
  • the mandrel 2 is threadedly connected to the elbow joint 14 to achieve axial positioning and locking; when the bridge plug is being set, the axial load is transmitted and the internal thread of the elbow joint 14 is sheared to realize the bridge plug's elbow setting.
  • the cone 12 is provided with an inner hole, and the upper end of the cone 12 is provided with an annular cone-shaped seat cover 1203 for the bridge plug to be used in the process of working underground. When the soluble ball 17 is tightly attached, the center hole of the bridge plug is sealed, thereby establishing a Seal, as shown in Figures 1 to 4.
  • the double-stage sealed metal soluble bridge plug also includes a push ring 4.
  • the push ring 4 is sleeved outside the mandrel 2.
  • the push ring 4 is connected up and down with the upper locking block assembly ring 6.
  • the push ring 4 is connected up and down with the upper locking block ring 6.
  • the outer surface of the push ring 4 includes an outer small diameter section 401 and an outer large diameter section 402 arranged up and down.
  • the lower part of the outer small diameter section 401 is provided with an annular groove 403.
  • the lower end surface of the push ring 4 is a lower tapered surface, and the lower tapered surface
  • the top of the push ring 4 is facing downward and the bottom is facing upward.
  • a plurality of lower guide ribs 404 are provided on the lower end surface of the push ring 4.
  • the plurality of lower guide ribs 404 are arranged at intervals along the circumferential direction of the push ring 4.
  • the lower guide ribs 404 are arranged along the circumferential direction of the push ring 4. Extend in the diameter direction, as shown in Figure 5.
  • the push ring 4 is in the shape of a ring and is made of alloy structural steel or stainless steel; the inner hole of the push ring 4 has a clearance fit with the mandrel 2, and the annular groove 403 on the push ring 4 is used to install the limit screw 3 , to achieve axial positioning.
  • the lower end of the push ring 4 is provided with a number of lower guide ribs 404, and the lower guide ribs 404 are designed to have a certain inclination angle.
  • the number and inclination angle of the lower guide ribs 404 are the same as the number of the upper locking blocks 601 and the inclination angle of the upper end surface. .
  • the upper locking block assembly ring 6 contains a plurality of upper locking blocks 601.
  • the upper locking blocks 601 are made of soluble alloy material.
  • the upper locking blocks 601 are in the shape of a wedge-shaped block.
  • the blocks 601 are arranged along the circumferential direction of the cone 12.
  • the upper end surface of the upper locking block 601 is provided with an upper guide groove 602.
  • the upper end surface of the upper locking block 601 matches and abuts with the lower end surface of the push ring 4.
  • the upper guide groove 602 Matching and plugging with the lower guide ribs 404 in one-to-one correspondence, the inner surface of the upper locking block 601 is matched and abutted with the upper cone section 1201, and the outer surface of the upper locking block 601 is provided with at least one anchor tooth 7, and the upper locking block 601 is locked.
  • the tightening block ring 6 is provided with an outer hoop 5.
  • the lower end of the upper locking block ring 6 is connected to a limit hoop 8.
  • the limit hoop 8 is set outside the upper cone section 1201.
  • the hoop 8 is made of soluble alloy material, as shown in Figure 6 .
  • the upper locking block 601 is made of low-strength soluble magnesium alloy material.
  • the inner surface of the upper locking block 601 matches the cone 12.
  • the cone angle of the inner surface of the upper locking block 601 is consistent with the upper cone surface of the cone 12.
  • the outer taper angles of the segments 1201 are the same, the lower guide ribs 404 play a guiding role, and the outer surface of the upper locking block 601 is provided with a round hole with a certain bevel for inlaying the anchoring teeth 7 .
  • the upper locking blocks 601 are composed of multiple evenly distributed blocks on the circumference to form an annular upper locking block group ring 6 , and are positioned by the outer hoop 5 and the limiting hoop 8 .
  • the number of upper locking blocks 601 in the upper locking block group ring 6 needs to be determined according to the outer diameter of the bridge plug.
  • the number of upper locking blocks 601 can be 6 to 12.
  • the main function of the locking block 601 is to slide downward along the cone 12 and expand radially under the action of axial force, gradually opening the upper metal sealing ring 9, the first support ring 10 and the second support ring 11 until they are tightly closed.
  • the inner wall of the casing 16, the anchoring teeth 7 initially bite into the inner wall of the casing 16, the locked position and the state of the upper metal sealing ring 9.
  • the outer hoop 5 and the limit hoop 8 are both made of soluble magnesium alloy with high elongation; they are mainly used to tighten a number of upper locking blocks 601 evenly distributed around the circumference; the limit hoop 8 also plays a buffering role. This prevents the upper locking block 601 from damaging the upper metal sealing ring 9 during the expansion process.
  • the anchor teeth 7 are cylindrical and can usually be made of high-strength or high-strength alloy steel or ceramic materials; they are mainly used after the bridge plug is set, and the anchor teeth 7 bite into the inner wall of the casing 16 to serve as a stable anchor for the bridge plug.
  • One of the key components are used after the bridge plug is set, and the anchor teeth 7 bite into the inner wall of the casing 16 to serve as a stable anchor for the bridge plug.
  • the cross section of the upper metal sealing ring 9 is wedge-shaped, and the material of the upper metal sealing ring 9 is a soluble alloy material.
  • the inner surface of the upper metal sealing ring 9 is matched and abutted with the upper cone segment 1201, and the upper metal sealing ring 9 is made of a soluble alloy material.
  • the inner surface of the ring 9 is provided with a plurality of inner grooves, and the outer surface of the upper metal sealing ring 9 is provided with a plurality of outer grooves.
  • the plurality of inner grooves and the plurality of outer grooves are arranged at intervals along the axis of the cone 12 .
  • the upper metal sealing ring 9 and the lower metal sealing ring 15 are symmetrical up and down and are mirror images of each other.
  • the cross section of the inner groove is V-shaped, the opening of the V-shape faces the cone 12, and the outer concave
  • the cross-section of the groove is rectangular.
  • the material elongation rate of the upper metal sealing ring 9 and the lower metal sealing ring 15 is ⁇ 20%.
  • the surfaces of the upper metal sealing ring 9 and the lower metal sealing ring 15 are equipped with high-temperature anti-corrosion coatings to ensure the wedge shape. The stability of the sealing ring in the high temperature and high pressure environment at the bottom of the well.
  • the upper metal sealing ring 9 and the lower metal sealing ring 15 are matched and connected with the cone 12.
  • the multiple inner grooves and the multiple outer grooves are mainly used to improve its overall ductile deformation ability; the upper metal sealing ring 9 and the lower metal sealing ring 9 are matched with the cone 12.
  • the ring 15 can expand and deform along the conical surface of the cone 12 under the action of axial force; it is finally wedged into the annulus between the cone 12 and the inner wall of the casing 16 to form a seal; the upper metal seal ring 9 and the lower metal seal
  • ring 15 is usually made of soluble magnesium alloy material with high elongation; the upper metal sealing ring 9 and the lower metal sealing ring 15 form a two-stage sealing structure to increase the effective sealing area, improving the sealing pressure-bearing reliability and stability of the all-metal soluble bridge plug; the structures of the upper metal sealing ring 9 and the lower metal sealing ring 15 are exactly the same.
  • the lower end of the upper metal sealing ring 9 is connected to a first support ring 10 and a second support ring 11 that are stacked up and down.
  • the first support ring 10 and the second support ring 11 are both sleeved on the upper cone section. 1201, the first support ring 10 and the second support ring 11 are both made of soluble alloy materials, and the inner surfaces of the first support ring 10 and the second support ring 11 are both provided with U-shaped grooves 1001 for To promote better fracture into a C shape, the U-shaped groove 1001 of the first support ring 10 and the U-shaped groove 1001 of the second support ring 11 are symmetrically distributed along the circumferential direction of the cone 12, as shown in FIG. 7 .
  • the first support ring 10 and the second support ring 11 are annular structures as a whole.
  • the first support ring 10 and the second support ring 11 are made of high-strength soluble magnesium alloy.
  • the first support ring 10 and the second support ring 11 are matched and connected with the cone 12, the first support ring 10 and the second support ring 11 fit together to form a support ring assembly, and the U-shaped groove 1001 of the first support ring 10 and the U-shaped groove 1001 of the second support ring 11
  • the groove 1001 maintains a 180° symmetrical position distribution, which can better support and protect the upper metal sealing ring 9, maintain the integrity of the upper metal sealing ring 9 when it is under pressure, and avoid its pressure deformation; ultimately affecting the bridge plug sealing performance.
  • the upper end of the cone 12 is provided with a support ring assembly composed of a first support ring 10 and a second support ring 11 , while the lower end of the cone 12 is only provided with the first support ring 10 , that is, outside the upper end of the lower metal sealing ring 15 Only the first support ring 10 is connected, and the first support ring 10 is matched and sleeved outside the lower cone section 1202 .
  • the upper conical surface section 1201 has a second support ring 11 outer and the lower conical surface section 1202 has a first support ring 10 outer and are spaced up and down.
  • the throwing joint 14 has an annular structure.
  • the throwing joint 14 is made of a soluble alloy material.
  • the throwing joint 14 is sleeved on the outside of the lower end of the mandrel 2 .
  • the upper end surface of the throwing joint 14 is an upper taper.
  • the top end of the upper tapered surface faces upwards and the bottom end faces downwards.
  • the upper end surface of the throw joint 14 is provided with a plurality of upper guide ribs 1401.
  • the plurality of upper guide ribs 1401 are spaced along the circumferential direction of the throw joint 14. Arranged, the upper guide ribs 1401 extend along the diameter direction of the throw joint 14.
  • the inner hole of the throwing joint 14 is provided with threads for threaded connection with the mandrel 2.
  • the upper end surface of the throwing joint 14 is provided with a plurality of upper guide ribs 1401 for supporting and guiding the anchor block 1301.
  • the lower end of the hand joint 14 is provided with a chamfer (taper) to serve as a guide; the internal thread type of the hand joint 14 can be rectangular thread, trapezoidal thread, ordinary thread, etc.; and the internal thread connection length of the hand joint 14 directly determines
  • the actual setting force of the bridge plug, as a key parameter, needs to be calculated through thread shear force calculation or obtained through a limited number of experiments.
  • the anchor block group ring 13 contains multiple anchor blocks 1301.
  • the anchor blocks 1301 are made of soluble alloy material.
  • the anchor blocks 1301 are in the shape of a wedge-shaped block.
  • the multiple anchor blocks 1301 are arranged along a cone. 12 circumferential arrangement, the lower end surface of the anchor block 1301 is provided with a lower guide groove 1302, the lower end surface of the anchor block 1301 matches and abuts with the upper end surface of the throw joint 14, the lower guide groove 1302 is in conjunction with the upper guide rib 1401 Correspondingly, the inner surface of the anchor block 1301 is matched and abutted with the lower cone section 1202.
  • the outer surface of the anchor block 1301 is provided with a plurality of anchor teeth 7. The plurality of anchor teeth 7 are along the cone 12.
  • the anchor block ring 13 is provided with an outer hoop 5.
  • the lower end of the anchor block ring 13 is connected to the limiting hoop 8.
  • the limiting hoop 8 is set outside the lower cone section 1202.
  • the materials of the outer hoop 5 and the limiting hoop 8 are both soluble alloy materials, as shown in Figure 8.
  • the anchor block 1301 is made of high-strength and high-temperature-resistant soluble magnesium alloy.
  • the lower end surface of the anchor block 1301 is provided with a lower guide groove 1302, which is used to cooperate with the upper guide rib 1401 of the throwing joint 14 to play a supporting and guiding role.
  • the lower end surface of the anchor block group ring 13 is a tapered surface, which is used to provide a larger radial force component for the anchor block 1301, which helps the anchor teeth 7 to change under the axial force when the bridge plug is being set. Bite well into the inner wall of casing 16.
  • the outer circumference of the anchor block 1301 is provided with three circular holes with a certain bevel for inlaying three anchor teeth 7; the anchor block 1301 is composed of multiple evenly distributed blocks on the circumference to form a ring-shaped anchor block group. ring 13, and positioned through the outer hoop 5 and the limiting hoop 8; forming a complete anchoring body.
  • the number of anchor blocks 1301 in the anchor block group ring 13 needs to be determined according to the outer diameter of the bridge plug. It can be 6 to 12 blocks.
  • the 10-block structure is used, and its main function is to act on the axial force. downward, sliding and radially expanding along the cone 12, gradually opening the lower metal sealing ring 15 and the first support ring 10, and finally sticking to the inner wall of the casing 16.
  • the anchor teeth 7 initially bite into the inner wall of the casing 16, locking the seat.
  • the sealing position and the state of the lower metal sealing ring 15 are realized; after the bridge plug is set, the initial anchoring at the designated position in the casing 16 is achieved.
  • the structure of the anchor block 1301 is similar to that of the upper locking block 601. The main difference is that the length is increased, the anchor teeth 7 are increased, and the lower end taper angle is increased. That is, the length of the anchor block 1301 in the up and down direction in Figure 1 is longer than that of the upper lock.
  • the length of the tightening block 601 and the number of anchoring teeth 7 on the anchoring block 1301 are greater than the number of anchoring teeth 7 on the upper locking block 601 .
  • the conical apex angle corresponding to the lower end surface of the anchor block group ring 13 is greater than the conical apex angle corresponding to the upper end surface of the upper locking block group ring 6 .
  • the double-stage sealed metal soluble bridge plug also includes a soluble ball 17 and a push cylinder 1.
  • the soluble ball 17 is spherical.
  • the soluble ball 17 is made of instant material.
  • the diameter of the soluble ball 17 depends on the diameter of the cone 12.
  • the push cylinder 1 is in the shape of a thin-walled cylinder. The lower end of the push cylinder 1 is in close contact with the upper side of the push ring 4.
  • the lower end of the push cylinder 1 is provided with 4 screw holes evenly distributed around the circumference for installing the limit screws 3; the push cylinder 1
  • the upper end of the bridge plug can be connected to the standard setting tool (external tool) when the bridge plug is lowered into the well, and it transmits the axial load.
  • the working process is to first use the standard setting tool on the tool string lowered by the bridge plug to provide a certain setting force to release the bridge plug. , and is set at a designated position in the casing 16.
  • the anchor block ring 13 expands radially and is close to the inner wall of the casing 16, while the anchor teeth 7 bite into the inner wall of the casing 16 to form an initial anchor; and then during fracturing During the construction process, as the pressure in the wellbore continues to increase, the anchoring teeth 7 further bite into the inner wall of the casing to keep the anchoring state of the bridge plug stable, as follows:
  • the upper end of the mandrel 2 and the upper end of the push cylinder 1 are threaded with the inner tool and the outer tool of the standard setting tool respectively, and by adjusting the thread screwing distance, the push cylinder 1 is pressed axially Tighten the upper end surface of the push ring 4 to ensure that the components between the push ring 4 of the bridge plug and the throw joint 14 are tightly matched; then tighten the four limit screws 3 at the lower end of the push cylinder 1 to ensure that the push cylinder 1 and the push ring 4 will not break away.
  • the external tool can provide the push cylinder 1 with axial downward thrust. While the push cylinder 1 moves downward axially, under the joint action of the push ring 4 and the throwing joint 14, the cone 12
  • the upper locking block ring 6, the limiting hoop 8, the upper metal sealing ring 9, the first support ring 10, the second support ring 11 and the anchoring block ring 13 at both ends have a corresponding tendency to expand along the cone surface. , and under the action of the cone surface of the cone 12, part of the axial force is converted into a radial force.
  • the upper locking block group ring 6 and the anchoring block group ring 13 have concave outer circles.
  • the outer hoops 5 in the groove break one after another, and then accelerate to expand until they are respectively close to the inner wall of the casing 16, locking the setting position of the bridge plug.
  • the axial pressure on the mandrel 2 will instantly shear the internal thread of the joint 14, completing the setting of the bridge plug.
  • the push cylinder 1, the push ring 4 and the mandrel 2 are lifted out of the wellhead along with the setting tool (inner tool) and can be reused.
  • the double-stage sealed metal soluble bridge plug completes initial anchoring and setting at a designated location downhole, and after each component is locked; according to the fracturing construction process requirements, soluble balls 17 are released from the wellhead. And the soluble ball is continuously pumped to the annular cone seat surface 1203 at the upper end of the cone 12 of the bottom hole bridge plug to complete the ball seating and seal the inner hole of the bridge plug; thereby achieving the overall sealing of the wellbore within the casing.
  • the anchoring teeth 7 further bite into the inner wall of the casing to achieve stable anchoring of the bridge plug; and further compact the metal sealing ring, and inside, Under the support and protection of the outer and anchor blocks, the metal sealing ring theoretically becomes tighter with greater pressure; thereby establishing an effective seal in the wellbore and completing the pressure-bearing and fracturing construction operations for a certain period of time.
  • the bridge plug can quickly dissolve on its own under certain conditions of temperature and salinity at the bottom of the well; each component of the bridge plug body will detach from the inner wall of the casing over time and will eventually completely dissolve into fine powder. The residue. And the higher the bottom hole temperature and salinity, the faster the dissolution rate; the shorter the time for complete dissolution.
  • the components of the double-stage sealed metal soluble bridge plug can be made of existing materials, and soluble means that it can be dissolved in water.
  • the present invention uses absolute positional relationships for expression. Unless otherwise specified, the directional word "upper” represents the direction of the upper side in Figure 1. The present invention adopts the observation perspective of the reader or user. Description is made, but the above directional terms cannot be understood or interpreted as limiting the scope of the present invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

一种双级密封式金属可溶桥塞，包括内外套设的芯轴(2)和锥体(12)，锥体(12)的外表面含有上下设置的上锥面段(1201)和下锥面段(1202)，上锥面段(1201)外套设有上下设置的上锁紧块组环(6)和上金属密封环(9)，下锥面段(1202)外套设有上下设置的下金属密封环(15)和锚定块组环(13)，芯轴(2)的下端连接有丢手接头(14)，锚定块组环(13)与丢手接头(14)上下连接。双级密封式金属可溶桥塞采用可溶的金属密封环，适用于高温、高压、高矿化度等工况，实现了桥塞的快速溶解，残留物少，保证非常规油气井的快速投产，降低施工周期和经济成本。

Description

双级密封式金属可溶桥塞
相关申请
本申请要求专利申请号为202211010679.3、申请日为2022年8月23日、发明名称为“双级密封式金属可溶桥塞”的中国发明专利的优先权。
技术领域
本发明涉及石油、天然气钻采压裂用井下工具领域，具体的是一种双级密封式金属可溶桥塞。
背景技术
为了增加石油采收率，提高油田生产效率，分层注采、多级分段压裂是特殊油层开发的有效手段之一。通常压裂时，采用桥塞密封井下套管，隔离目的层段。而可溶桥塞是一种新型的页岩气压裂用分层分段改造工具，压裂完成后依靠井筒温度及一定的矿化度液体环境即可实现桥塞本体完全溶解，确保井筒全通径生产，具有综合成本低、投产时间短、降低作业风险以及可实现二次改造的优点。
经多年发展，桥塞从铸铁可钻桥塞、复合可钻桥塞发展到可溶桥塞；而目前常见的可溶桥塞多数是通过可溶橡胶筒受挤压弹性变形，实现井下套管的密封及层间封隔。可溶桥塞的金属部件在井下一定温度、矿化度条件下，能够得到较好的溶解，最终成粉末状或细小颗粒状溶解残余物，而可溶胶筒则主要是降解成块状残余物，不仅溶解速度慢、周期长，随着下入桥塞数量的增多，溶解残余物的堆积，影响返排生产，通常需要进行钻磨通井作业，增加成本。此外，随着非常规油气藏的深入开发，对可溶桥塞的整体性能指标及压力、温度等级均具有了更高的要求，不断向耐高温、高压、快溶、残余物少等方向发展。而可溶橡胶在高温条件下的耐受性、密封稳定性等方面存在一定的不足。
申请内容
为了解决上述可溶桥塞中橡胶容易老化的问题，本发明提供了一种双级密封式金属可溶桥塞，所述双级密封式金属可溶桥塞采用可溶的金属密封环，适用于高温、高压、高矿化度等工况，实现了桥塞的快速溶解，残留物少，保证非常规油气井的快速投产， 降低施工周期和经济成本。
本发明解决其技术问题所采用的技术方案是：
一种双级密封式金属可溶桥塞，包括内外套设的芯轴和锥体，锥体的外表面含有上下设置的上锥面段和下锥面段，上锥面段的顶端朝上底端朝下，上锥面段外套设有上下设置的上锁紧块组环和上金属密封环，下锥面段的顶端朝下底端朝上，下锥面段外套设有上下设置的下金属密封环和锚定块组环，芯轴的下端连接有丢手接头，锚定块组环与丢手接头上下连接，当上锁紧块组环相对于芯轴向下移动的过程中，锥体也能够相对于芯轴向下移动，上锁紧块组环、上金属密封环、下金属密封环和锚定块组环均能够径向扩张。
本发明的有益效果是：所述双级密封式耐高温高压全金属可溶桥塞，通过采用对称分布的楔入式金属密封环与支撑环，构成双级密封结构，能够增大有效密封面积，提高全金属可溶桥塞的密封承压可靠性和稳定性；并结合金属密封环表面耐高温耐腐蚀涂层，提升其井底复杂工况适应性和有效密封承压工作时间，保障压裂作业的平稳施工；且该全金属可溶桥塞的整体结构简单、新颖；具有通经大、耐高压、密封承压稳定性强，溶解快、残余物少等技术特点；在分段压裂施工后即可快速溶解，实现通井、投产，降低施工周期和经济成本。
附图说明
构成本申请的一部分的说明书附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。
图1是本发明所述双级密封式金属可溶桥塞的示意图。
图2是本发明所述双级密封式金属可溶桥塞的坐封锚定工作状态示意图。
图3是芯轴的示意图。
图4是锥体的示意图。
图5是推环的示意图。
图6是上锁紧块的示意图。
图7是第一支撑环的示意图。
图8是锚定块组环的示意图。
附图标记说明如下：
1、推筒；2、芯轴；3、限位螺钉；4、推环；5、外箍环；6、上锁紧块组环；7、 锚定齿；8、限位箍环；9、上金属密封环；10、第一支撑环；11、第二支撑环；12、锥体；13、锚定块组环；14、丢手接头；15、下金属密封环；16、套管；17、可溶球；
201、第一大径段；202、第二大径段；203、第一小径段；204、第二小径段；205、环形锥状外过渡段；
401、外小径段；402、外大径段；403、环形凹槽；404、下导向筋；
601、上锁紧块；602、上导向槽；
1001、U形槽；
1201、上锥面段；1202、下锥面段；1203、环形锥状坐封面；
1301、锚定块；1302、下导向槽；
1401、上导向筋。
具体实施方式
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本发明。
一种双级密封式金属可溶桥塞，包括内外套设的芯轴2和锥体12，锥体12的外表面含有上下设置的上锥面段1201和下锥面段1202，上锥面段1201和下锥面段1202均为圆锥形面，上锥面段1201的顶端朝上底端朝下(即上锥面段1201的上端外径小于下端外径)，上锥面段1201外套设有上下设置的上锁紧块组环6和上金属密封环9，下锥面段1202的顶端朝下底端朝上(即下锥面段1202的下端外径小于上端外径)，下锥面段1202外套设有上下设置的下金属密封环15和锚定块组环13，芯轴2的下端连接有丢手接头14，锚定块组环13与丢手接头14上下连接，当上锁紧块组环6相对于芯轴2向下移动的过程中，锥体12也能够相对于芯轴2向下移动，上锁紧块组环6、上金属密封环9、下金属密封环15和锚定块组环13均能够径向扩张，如图1至图8所示。
所述双级密封式金属可溶桥塞还包括用于桥塞坐封的试配组件：推筒1和限位螺钉3，推筒1与推环4通过限位螺钉3连接。其中，上金属密封环9和下金属密封环15对称安装在锥体12的上下两端外，形成组合式双级金属密封结构，所述双级密封式金属可溶桥塞的各部件依次轴向安装在锥体12的两端，相互配合；且整体安装在芯轴2上，通过丢手接头14的内螺纹与芯轴2下端的外螺纹连接，实现轴向的定位和锁紧。
在本实施例中，芯轴2为直立的管状结构，芯轴2的外表面含有从上向下依次设置的第一大径段201、第二大径段202、第一小径段203和第二小径段204，第一大径段 201的外径、第二大径段202的外径、第一小径段203的外径和第二小径段204的外径依次减小，锥体12为直立的筒形结构，上锥面段1201与下锥面段1202上下对称且互为镜像，如图3所示。
在本实施例中，芯轴2的轴线和锥体12的轴线重合，芯轴2的上端位于锥体12的上端外，芯轴2的下端位于锥体12的下端外，第一大径段201内设有内螺纹，锥体12主要套设于第一小径段203外，第二大径段202和第一小径段203之间设有环形锥状外过渡段205，锥体12的上端内设有环形锥状坐封面1203，环形锥状坐封面1203为圆锥面，环形锥状坐封面1203的顶端朝下底端朝上，环形锥状外过渡段205与环形锥状坐封面1203匹配抵接，第二小径段204套设于丢手接头14内，第二小径段204与丢手接头14内外螺纹连接，第二小径段204的外螺纹能够剪断丢手接头14的内螺纹。
芯轴2采用合金结构钢材料制成，芯轴2内设有台阶形通孔，第一大径段201内设有内螺纹可以与标准坐封工具连接。芯轴2与丢手接头14螺纹连接实现轴向的定位和锁紧；在桥塞坐封时，传递轴向载荷并剪切丢手接头14的内螺纹，实现桥塞的丢手坐封。锥体12内设有内孔通，锥体12的上端内设有环形锥状坐封面1203用于桥塞在井下工作过程中，可溶球17贴紧时封堵桥塞的中心孔，建立密封，如图1至图4所示。
在本实施例中，所述双级密封式金属可溶桥塞还包括推环4，推环4套设于芯轴2外，推环4与上锁紧块组环6上下连接，推环4的外表面含有上下设置的外小径段401和外大径段402，外小径段401的下部设有环形凹槽403，推环4的下端面为下锥形面，所述下锥形面的顶端朝下底端朝上，推环4的下端面上设有多条下导向筋404，多条下导向筋404沿推环4的周向间隔排列，下导向筋404沿推环4的直径方向延伸，如图5所示。
推环4呈圆环状，推环4采用合金结构钢或不锈钢材料制成；推环4的内孔与芯轴2间隙配合，推环4上的环形凹槽403用于安装限位螺钉3，实现轴向定位。推环4的下端设有若干的下导向筋404，且下导向筋404设计成一定的倾斜角度，下导向筋404的数量和倾斜角度与上锁紧块601的数量及上端面的倾斜角度相同。
在本实施例中，上锁紧块组环6含有多个上锁紧块601，上锁紧块601的材质为可溶合金材料，上锁紧块601呈楔形块状，多个上锁紧块601沿锥体12的周向排列，上锁紧块601的上端面内设有上导向槽602，上锁紧块601的上端面与推环4的下端面匹配抵接，上导向槽602与下导向筋404一一对应地匹配插接，上锁紧块601的内表面与上锥面段1201匹配抵接，上锁紧块601的外表面设有至少一个锚定齿7，上锁紧块组环 6外套设有外箍环5，上锁紧块组环6的下端连接有限位箍环8，限位箍环8套设于上锥面段1201外，外箍环5和限位箍环8的材质均为可溶合金材料，如图6所示。
上锁紧块601采用低强度可溶镁合金材料制成，上锁紧块601的内表面与锥体12配合，上锁紧块601的内表面的锥面角度与锥体12的上锥面段1201的外锥面角度相同，下导向筋404起导向作用，上锁紧块601的外表面设有一定斜角的圆孔，用于镶嵌锚定齿7。上锁紧块601采用多块均布的方式在圆周上组合成圆环状的上锁紧块组环6，并通过外箍环5和限位箍环8进行定位。
上锁紧块组环6中上锁紧块601块数则需要根据桥塞的外径尺寸决定，上锁紧块601块数可以是6块-12块，例如采用的10块式结构；上锁紧块601主要作用是在轴向力作用下，沿锥体12向下滑动且径向扩张，逐渐撑开上金属密封环9、第一支撑环10和第二支撑环11，直到贴紧套管16的内壁，锚定齿7初始咬入套管16内壁，锁定位置和上金属密封环9的状态。
外箍环5和限位箍环8均采用高延伸率的可溶镁合金制成；主要用于箍紧圆周均布的若干上锁紧块601；限位箍环8还起到缓冲作用，避免上锁紧块601在扩张过程中损伤上金属密封环9。锚定齿7呈圆柱形，通常可以采用高强度或高强度的合金钢或陶瓷材料制成；主要用于桥塞坐封后，锚定齿7咬入套管16内壁，是桥塞稳固锚定的关键部件之一。
在本实施例中，上金属密封环9的断面呈楔形，上金属密封环9的材质为可溶合金材料，上金属密封环9的内表面与上锥面段1201匹配抵接，上金属密封环9的内表面设有多道内凹槽，上金属密封环9的外表面设有多道外凹槽，所述多道内凹槽和多道外凹槽均沿锥体12的轴线间隔排列。
在本实施例中，上金属密封环9与下金属密封环15上下对称且互为镜像，所述内凹槽的断面为V形，所述V形的开口朝向锥体12，所述外凹槽的断面为矩形，上金属密封环9和下金属密封环15的材料延伸率≥20％，上金属密封环9和下金属密封环15的表面均设有高温抗腐蚀涂层，以确保楔形密封环在井底高温高压环境下的稳定性。
上金属密封环9和下金属密封环15均与锥体12匹配连接，所述多道内凹槽和多道外凹槽主要用于改善其整体的延展变形能力；上金属密封环9和下金属密封环15可以在轴向力的作用下沿锥体12的圆锥面扩径变形；最终楔入锥体12与套管16内壁之间的环空中，形成密封；上金属密封环9和下金属密封环15作为全金属可溶桥塞的关键部件，通常采用延伸率较高的可溶镁合金材料制成；上金属密封环9和下金属密封环15 构成双级密封式结构，增大有效密封面积，提高全金属可溶桥塞的密封承压可靠性和稳定性；上金属密封环9和下金属密封环15的结构完全相同。
在本实施例中，上金属密封环9的下端连接有上下层叠连接的第一支撑环10和第二支撑环11，第一支撑环10和第二支撑环11均套设于上锥面段1201外，第一支撑环10和第二支撑环11的材质均为可溶合金材料，第一支撑环10的内表面和第二支撑环11的内表面均设有U形槽1001，用于促进其较好的断裂成C型，第一支撑环10的U形槽1001与第二支撑环11的U形槽1001沿锥体12的周向对称分布，如图7所示。
第一支撑环10和第二支撑环11整体均为环状结构，第一支撑环10和第二支撑环11均采用高强度可溶镁合金制成，第一支撑环10和第二支撑环11均与锥体12匹配连接，第一支撑环10和第二支撑环11两者贴合，构成支撑环组件，且第一支撑环10的U形槽1001与第二支撑环11的U形槽1001保持180°对称位置分布，可以更好的起到对上金属密封环9的支撑保护作用，保持上金属密封环9在承压时的完整性，避免其受压变形；最终影响桥塞的密封性能。其中，锥体12的上端设有第一支撑环10和第二支撑环11构成的支撑环组件，而锥体12的下端仅设有第一支撑环10，即下金属密封环15的上端外仅连接有第一支撑环10，第一支撑环10匹配的套设于下锥面段1202外。上锥面段1201外套设第二支撑环11与下锥面段1202外套设第一支撑环10上下间隔设置。
在本实施例中，丢手接头14呈环形结构，丢手接头14的材质为可溶合金材料，丢手接头14套设于芯轴2的下端外，丢手接头14的上端面为上锥形面，所述上锥形面的顶端朝上底端朝下，丢手接头14的上端面上设有多条上导向筋1401，多条上导向筋1401沿丢手接头14的周向间隔排列，上导向筋1401沿丢手接头14的直径方向延伸。
丢手接头14的内孔设有螺纹，用于与芯轴2螺纹连接，丢手接头14的上端面上设有多条上导向筋1401用于对锚定块1301的支撑和导向作用，丢手接头14的下端设有倒角(锥面)起导向作用；丢手接头14的内螺纹类型可以选择矩形螺纹、梯形螺纹、普通螺纹等；而丢手接头14的内螺纹连接长度直接决定着桥塞实际坐封的丢手力，其作为关键参数，需要通过螺纹剪切力计算得到或有限次实验获得。
在本实施例中，锚定块组环13含有多个锚定块1301，锚定块1301的材质为可溶合金材料，锚定块1301呈楔形块状，多个锚定块1301沿锥体12的周向排列，锚定块1301的下端面内设有下导向槽1302，锚定块1301的下端面与丢手接头14的上端面匹配抵接，下导向槽1302与上导向筋1401一一对应地匹配插接，锚定块1301的内表面与下锥面段1202匹配抵接，锚定块1301的外表面设有多个锚定齿7，多个锚定齿7沿锥体12 的轴向间隔排列，锚定块组环13外套设有外箍环5，锚定块组环13的下端连接有限位箍环8，限位箍环8套设于下锥面段1202外，外箍环5和限位箍环8的材质均为可溶合金材料，如图8所示。
锚定块1301采用高强度耐高温可溶镁合金制成，锚定块1301的下端面内设有下导向槽1302，用于与丢手接头14的上导向筋1401配合，起支撑和导向作用。锚定块组环13的下端面为锥面是用于为锚定块1301提供更大的径向分力，有助于桥塞在坐封时，受轴向力作用下锚定齿7更好的咬入套管16内壁。
锚定块1301外圆设有三个一定斜角的圆孔，用于镶嵌三个锚定齿7；锚定块1301采用多块均布的方式在圆周上组合成圆环状的锚定块组环13，并通过外箍环5和限位箍环8进行定位；形成一个完整的锚定体。
锚定块组环13中锚定块1301的块数则需要根据桥塞的外径尺寸决定，可以是6块-12块，例如采用的10块式结构，其主要作用是在轴向力作用下，沿锥体12的滑动且径向扩张，逐渐撑开下金属密封环15和第一支撑环10，最终贴紧套管16内壁，锚定齿7初始咬入套管16内壁，锁定坐封位置和下金属密封环15的状态；实现桥塞丢手坐封后，在套管16内指定位置的初始锚定。
锚定块1301的结构与上锁紧块601结构相似，主要是区别是长度增加，锚定齿7增多，下端锥面角度增大，即锚定块1301在图1上下方向的长度大于上锁紧块601的长度，锚定块1301上锚定齿7的数量大于上锁紧块601上锚定齿7的数量。锚定块组环13的下端面对应的圆锥形的顶角大于上锁紧块组环6的上端面对应的圆锥形的顶角。
所述双级密封式金属可溶桥塞还包括可溶球17和推筒1，可溶球17呈球状，可溶球17采用速溶材料制成，可溶球17直径取决于锥体12的内通径大小；桥塞在井下坐封后，可溶球17最终贴紧锥体12的环形锥状坐封面1203，起封堵内孔的作用。推筒1呈薄壁圆筒状，推筒1的下端与推环4的上侧贴紧，推筒1的下端设有圆周均布的4个螺钉孔，用以安装限位螺钉3；推筒1的上端可以与桥塞入井下放时的标准坐封工具(外工具)连接，其传递轴向载荷的作用。
下面介绍所述双级密封式金属可溶桥塞的工作过程。
由于所述双级密封式金属可溶桥塞在井下坐封锚定并承压的工作过程是先通过桥塞下放的工具串上的标准坐封工具提供一定的坐封力将桥塞丢手，并坐封在套管16内的指定位置，锚定块组环13径向扩张贴紧套管16内壁，而锚定齿7则咬入套管16内壁形成初始锚定；进而在压裂施工过程中，随着井筒内的压力持续升高，此时锚定齿7 进一步的咬入套管内壁，保持桥塞的锚定状态趋于稳定，具体如下：
1、所述双级密封式金属可溶桥塞的丢手坐封
如图1所示，而芯轴2的上端和推筒1的上端分别与标准坐封工具的内工具和外工具通过螺纹连接，并通过调节螺纹旋合的距离，使推筒1轴向压紧推环4的上端面，确保桥塞的推环4与丢手接头14之间的各部件紧密配合；随后上紧推筒1下端的4个限位螺钉3，确保推筒1和推环4不会脱离。
当坐封工具工作时，外工具能够提供给推筒1轴向向下的推力，在推筒1向下轴向移动的同时，在推环4和丢手接头14的共同作用下，锥体12两端的上锁紧块组环6、限位箍环8、上金属密封环9、第一支撑环10、第二支撑环11和锚定块组环13均相应产生沿锥面扩张的趋势，且在锥体12的锥面的作用下，轴向力有一部分转换为径向力，当轴向推力达到一定值时，上锁紧块组环6和锚定块组环13外圆凹槽内的外箍环5相继断裂，随后则加速扩张，直到分别贴紧套管16内壁，锁定桥塞的坐封位置。桥塞锁定后，再进一步的，在坐封工具提供的轴向力作用下，芯轴2受到的轴向压力将丢手接头14的内螺纹瞬间剪断，完成桥塞的丢手坐封。完成丢手坐封后，推筒1、推环4和芯轴2随坐封工具(内工具)被提出井口，可重复使用。
2、所述双级密封式金属可溶桥塞的密封承压
如图2所示，所述双级密封式金属可溶桥塞在井下指定位置完成初始锚定和坐封，各部件完成锁定后；根据压裂施工工艺要求，从井口投放可溶球17，并将可溶球持续泵送至井底桥塞的锥体12上端的环形锥状坐封面1203处，完成坐球，封堵桥塞的内孔；实现套管内井筒的整体封堵。进而在压裂施工过程中，随着井筒内的压力持续升高，锚定齿7进一步的咬入套管内壁，实现桥塞的稳固锚定；且进一步压实金属密封环，且在内、外和锚定块的支撑保护作用下，金属密封环在理论上属于越压越紧的状态；从而建立井筒内的有效密封，完成一定时间的承压、压裂施工作业。
3、所述双级密封式金属可溶桥塞的快速溶解
在完成压裂施工作业后，桥塞在井底一定温度、矿化度条件下，可自行快速溶解；桥塞本体各部件随着溶解时间会从套管内壁脱离；最终完全溶解成细小粉末状残余物。且井底温度、矿化度越高，溶解速度越快；完全溶解的时间越短。所述双级密封式金属可溶桥塞的组成部件的材料均可以采用现有材料，可溶的含义为可以溶解于水。
为了便于理解和描述，本发明中采用了绝对位置关系进行表述，如无特别说明，其中的方位词“上”表示图1的上侧的方向，本发明采用了阅读者或使用者的观察视角 进行描述，但上述方位词不能理解或解释为是对本发明保护范围的限定。
以上所述，仅为本发明的具体实施例，不能以其限定发明实施的范围，所以其等同组件的置换，或依本发明专利保护范围所作的等同变化与修饰，都应仍属于本专利涵盖的范畴。另外，本发明中的技术特征与技术特征之间、技术特征与技术方案、技术方案与技术方案、实施例与实施例之间均可以自由组合使用。

Claims (10)

  1. 一种双级密封式金属可溶桥塞，其中，所述双级密封式金属可溶桥塞包括内外套设的芯轴(2)和锥体(12)，锥体(12)的外表面含有上下设置的上锥面段(1201)和下锥面段(1202)，上锥面段(1201)的顶端朝上底端朝下，上锥面段(1201)外套设有上下设置的上锁紧块组环(6)和上金属密封环(9)，下锥面段(1202)的顶端朝下底端朝上，下锥面段(1202)外套设有上下设置的下金属密封环(15)和锚定块组环(13)，芯轴(2)的下端连接有丢手接头(14)，锚定块组环(13)与丢手接头(14)上下连接，当上锁紧块组环(6)相对于芯轴(2)向下移动的过程中，锥体(12)也能够相对于芯轴(2)向下移动，上锁紧块组环(6)、上金属密封环(9)、下金属密封环(15)和锚定块组环(13)均能够径向扩张。
  2. 根据权利要求1所述的双级密封式金属可溶桥塞，其中，芯轴(2)为直立的管状结构，芯轴(2)的外表面含有从上向下依次设置的第一大径段(201)、第二大径段(202)、第一小径段(203)和第二小径段(204)，第一大径段(201)的外径、第二大径段(202)的外径、第一小径段(203)的外径和第二小径段(204)的外径依次减小，锥体(12)为直立的筒形结构，上锥面段(1201)与下锥面段(1202)上下对称且互为镜像。
  3. 根据权利要求2所述的双级密封式金属可溶桥塞，其中，第一大径段(201)内设有内螺纹，锥体(12)套设于第一小径段(203)外，第二大径段(202)和第一小径段(203)之间设有环形锥状外过渡段(205)，锥体(12)的上端内设有环形锥状坐封面(1203)，环形锥状外过渡段(205)与环形锥状坐封面(1203)匹配抵接，第二小径段(204)与丢手接头(14)内外螺纹连接，第二小径段(204)的外螺纹能够剪断丢手接头(14)的内螺纹。
  4. 根据权利要求1所述的双级密封式金属可溶桥塞，其中，所述双级密封式金属可溶桥塞还包括推环(4)，推环(4)套设于芯轴(2)外，推环(4)与上锁紧块组环(6)上下连接，推环(4)的外表面含有上下设置的外小径段(401)和外大径段(402)，外小径段(401)的下部设有环形凹槽(403)，推环(4)的下端面为下锥形面，所述下锥形面的顶端朝下底端朝上，推环(4)的下端面上设有多条下导向筋(404)，多条下导向筋(404)沿推环(4)的周向间隔排列，下导向筋(404)沿推环(4)的直径方向延伸。
  5. 根据权利要求4所述的双级密封式金属可溶桥塞，其中，上锁紧块组环(6)含 有多个上锁紧块(601)，上锁紧块(601)的材质为可溶合金材料，上锁紧块(601)呈楔形块状，多个上锁紧块(601)沿锥体(12)的周向排列，上锁紧块(601)的上端面内设有上导向槽(602)，上锁紧块(601)的上端面与推环(4)的下端面匹配抵接，上导向槽(602)与下导向筋(404)一一对应地匹配插接，上锁紧块(601)的内表面与上锥面段(1201)匹配抵接，上锁紧块(601)的外表面设有至少一个锚定齿(7)，上锁紧块组环(6)外套设有外箍环(5)，上锁紧块组环(6)的下端连接有限位箍环(8)，限位箍环(8)套设于上锥面段(1201)外，外箍环(5)和限位箍环(8)的材质均为可溶合金材料。
  6. 根据权利要求1所述的双级密封式金属可溶桥塞，其中，上金属密封环(9)的断面呈楔形，上金属密封环(9)的材质为可溶合金材料，上金属密封环(9)的内表面与上锥面段(1201)匹配抵接，上金属密封环(9)的内表面设有多道内凹槽，上金属密封环(9)的外表面设有多道外凹槽，所述多道内凹槽和多道外凹槽均沿锥体(12)的轴线间隔排列。
  7. 根据权利要求6所述的双级密封式金属可溶桥塞，其中，上金属密封环(9)与下金属密封环(15)上下对称且互为镜像，所述内凹槽的断面为V形，所述V形的开口朝向锥体(12)，所述外凹槽的断面为矩形，上金属密封环(9)和下金属密封环(15)的材料延伸率≥20％，上金属密封环(9)和下金属密封环(15)的表面均设有高温抗腐蚀涂层。
  8. 根据权利要求1所述的双级密封式金属可溶桥塞，其中，上金属密封环(9)的下端连接有上下层叠连接的第一支撑环(10)和第二支撑环(11)，第一支撑环(10)和第二支撑环(11)均套设于上锥面段(1201)外，第一支撑环(10)和第二支撑环(11)的材质均为可溶合金材料，第一支撑环(10)的内表面和第二支撑环(11)的内表面均设有U形槽(1001)，第一支撑环(10)的U形槽(1001)与第二支撑环(11)的U形槽(1001)沿锥体(12)的周向对称分布。
  9. 根据权利要求1所述的双级密封式金属可溶桥塞，其中，丢手接头(14)呈环形结构，丢手接头(14)的材质为可溶合金材料，丢手接头(14)套设于芯轴(2)的下端外，丢手接头(14)的上端面为上锥形面，所述上锥形面的顶端朝上底端朝下，丢手接头(14)的上端面上设有多条上导向筋(1401)，多条上导向筋(1401)沿丢手接头(14)的周向间隔排列，上导向筋(1401)沿丢手接头(14)的直径方向延伸。
  10. 根据权利要求9所述的双级密封式金属可溶桥塞，其中，锚定块组环(13)含 有多个锚定块(1301)，锚定块(1301)的材质为可溶合金材料，锚定块(1301)呈楔形块状，多个锚定块(1301)沿锥体(12)的周向排列，锚定块(1301)的下端面内设有下导向槽(1302)，锚定块(1301)的下端面与丢手接头(14)的上端面匹配抵接，下导向槽(1302)与上导向筋(1401)一一对应地匹配插接，锚定块(1301)的内表面与下锥面段(1202)匹配抵接，锚定块(1301)的外表面设有多个锚定齿(7)，多个锚定齿(7)沿锥体(12)的轴向间隔排列，锚定块组环(13)外套设有外箍环(5)，锚定块组环(13)的下端连接有限位箍环(8)，限位箍环(8)套设于下锥面段(1202)外，外箍环(5)和限位箍环(8)的材质均为可溶合金材料。
PCT/CN2022/136060 2022-08-23 2022-12-02 双级密封式金属可溶桥塞 Ceased WO2024040786A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211010679.3 2022-08-23
CN202211010679.3A CN116446822B (zh) 2022-08-23 2022-08-23 双级密封式金属可溶桥塞

Publications (1)

Publication Number Publication Date
WO2024040786A1 true WO2024040786A1 (zh) 2024-02-29

Family

ID=87126193

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/136060 Ceased WO2024040786A1 (zh) 2022-08-23 2022-12-02 双级密封式金属可溶桥塞

Country Status (2)

Country Link
CN (1) CN116446822B (zh)
WO (1) WO2024040786A1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116427884A (zh) * 2022-09-30 2023-07-14 中国石油天然气集团有限公司 速溶桥塞
CN119288383A (zh) * 2024-12-12 2025-01-10 天津市通盈石油技术开发有限公司 油管气密封桥塞
CN120759559A (zh) * 2025-08-11 2025-10-10 陕西海格瑞恩实业有限公司 一种可监测的密封可溶桥塞结构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203097816U (zh) * 2013-03-01 2013-07-31 北京德美高科科技有限责任公司 一种双密封堵漏桥塞装置
US20170342798A1 (en) * 2016-08-24 2017-11-30 Kevin David Wutherich Hybrid bridge plug
CN109973045A (zh) * 2019-03-29 2019-07-05 东方宝麟科技发展(北京)有限公司 全可溶桥塞
CN110792408A (zh) * 2019-11-13 2020-02-14 百勤能源科技（惠州）有限公司 一种硬密封可溶桥塞
CN112523721A (zh) * 2020-12-21 2021-03-19 陈爱民 可溶解桥塞用密封组合体、可溶解桥塞及间隙的密封方法
CN112727398A (zh) * 2021-02-05 2021-04-30 四川捷贝通能源科技有限公司 一种微量橡胶密封式可溶桥塞

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN213331015U (zh) * 2020-08-20 2021-06-01 四川省威沃敦化工有限公司 一种双锥体胶皮密封可溶桥塞
CN214330593U (zh) * 2020-12-31 2021-10-01 盐城市鑫源石化机械有限公司 一种双向承压压裂用可溶桥塞
CN114086914A (zh) * 2021-12-15 2022-02-25 中国石油化工股份有限公司 一种挤堵施工用桥塞

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203097816U (zh) * 2013-03-01 2013-07-31 北京德美高科科技有限责任公司 一种双密封堵漏桥塞装置
US20170342798A1 (en) * 2016-08-24 2017-11-30 Kevin David Wutherich Hybrid bridge plug
CN109973045A (zh) * 2019-03-29 2019-07-05 东方宝麟科技发展(北京)有限公司 全可溶桥塞
CN110792408A (zh) * 2019-11-13 2020-02-14 百勤能源科技（惠州）有限公司 一种硬密封可溶桥塞
CN112523721A (zh) * 2020-12-21 2021-03-19 陈爱民 可溶解桥塞用密封组合体、可溶解桥塞及间隙的密封方法
CN112727398A (zh) * 2021-02-05 2021-04-30 四川捷贝通能源科技有限公司 一种微量橡胶密封式可溶桥塞

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116427884A (zh) * 2022-09-30 2023-07-14 中国石油天然气集团有限公司 速溶桥塞
CN116427884B (zh) * 2022-09-30 2026-03-24 中国石油天然气集团有限公司 速溶桥塞
CN119288383A (zh) * 2024-12-12 2025-01-10 天津市通盈石油技术开发有限公司 油管气密封桥塞
CN120759559A (zh) * 2025-08-11 2025-10-10 陕西海格瑞恩实业有限公司 一种可监测的密封可溶桥塞结构

Also Published As

Publication number Publication date
CN116446822A (zh) 2023-07-18
CN116446822B (zh) 2026-01-23

Similar Documents

Publication Publication Date Title
WO2024040786A1 (zh) 双级密封式金属可溶桥塞
US10408012B2 (en) Downhole tool with an expandable sleeve
CA3089143C (en) Zonal isolation device with expansion ring
US20180030807A1 (en) Downhole tool with an expandable sleeve
CN113338844B (zh) 金属可溶球座、坐封系统及坐封方法
US8267177B1 (en) Means for creating field configurable bridge, fracture or soluble insert plugs
AU770359B2 (en) Liner hanger
CN104453784B (zh) 一种可控型可溶球座多级压裂滑套
CN115749677B (zh) 一种分段压裂c类页岩套变井的小直径可溶桥塞
US11434715B2 (en) Frac plug with collapsible plug body having integral wedge and slip elements
CN109519146A (zh) 一种小尺寸可溶桥塞
US7124827B2 (en) Expandable whipstock anchor assembly
US20170204700A1 (en) Wellbore tool and method
CN109812243A (zh) 一种套管内坐封可降解定位球座
CN106593385A (zh) 压裂工具及分段压裂管柱
CN105971557A (zh) 一种全溶桥塞
EP0592739B1 (en) Load support ring
CN114809976B (zh) 可溶封隔器和多级滑套压裂管柱
CN110331959A (zh) 一种封堵工具
CN116427884B (zh) 速溶桥塞
CN119021623A (zh) 一种金属封隔器
CN116241212A (zh) 一种可降解复合桥塞
CN219910708U (zh) 可变径螺旋密封环式可溶桥塞及坐封装置
CN114109295B (zh) 机械胀封可退式捞矛堵塞器
CN109356546B (zh) 一种抗冲蚀高温高压封隔器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22956320

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22956320

Country of ref document: EP

Kind code of ref document: A1