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CN-122014149-A - Double-key intelligent switch large-drift-diameter well cementation sliding sleeve system

CN122014149ACN 122014149 ACN122014149 ACN 122014149ACN-122014149-A

Abstract

The invention discloses a double-key intelligent switch large-drift diameter well cementation sliding sleeve system, which relates to the technical field of oil and gas well fracturing and comprises a plurality of soluble plungers and a plurality of sliding sleeves. The soluble plunger comprises a soluble ball, a ball seat, an elastic tube and a front seat, wherein an opening is formed in the top of the ball seat, the inner wall of the ball seat is used for clamping the soluble ball, the outer wall of the ball seat is connected with the top end of the elastic tube through a plurality of first pins, a plurality of annular grooves are formed in the outer wall of the ball seat, a sealing ring is arranged in the annular grooves and positioned above the elastic tube, the front seat is connected to the bottom end of the elastic tube, two elastic rings and a plurality of strip-shaped grooves penetrating through the elastic tube are formed in the outer wall of the elastic tube, each elastic ring is divided into a plurality of elastic sheets by the strip-shaped grooves, the bottom ends of the elastic sheets are in an acute angle structure, the top ends of the elastic sheets are in an obtuse angle structure, two clamping grooves are formed in the inner wall of the sliding sleeve, and the bottom ends of the clamping grooves are in an acute angle structure and are used for clamping the corresponding elastic sheets on the corresponding soluble plunger. The number of stages of the fracturing stage can be greatly increased by the double key structural code.

Inventors

  • FAN XIUPING

Assignees

  • 四川番格林石油科技有限责任公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The double-key intelligent switch large-drift diameter well cementation sliding sleeve system is characterized by comprising a plurality of soluble plungers (2) and a plurality of sliding sleeves (1); The soluble plunger (2) comprises a soluble ball (21), a ball seat (23), an elastic tube (24) and a front seat (25), wherein the top opening of the ball seat (23) is arranged, the inner wall of the ball seat (23) is used for clamping the soluble ball (21), the outer wall of the ball seat (23) is connected with the top end of the elastic tube (24) through a plurality of first pins (231), a plurality of annular grooves are formed in the outer wall of the ball seat (23), a sealing ring is arranged in each annular groove and is positioned above the elastic tube (24), the front seat (25) is connected to the bottom end of the elastic tube (24), two elastic rings and a plurality of strip-shaped grooves (242) penetrating the elastic tube (24) are formed in the outer wall of the elastic tube (24), each elastic ring is divided into a plurality of elastic pieces (241), the bottom ends of the elastic pieces (241) are in an acute angle structure, and the top ends of the elastic pieces are in an obtuse angle structure; The inner wall of the sliding sleeve (1) is provided with two clamping grooves (141), and the bottom ends of the clamping grooves (141) are in an acute angle structure and are used for clamping corresponding elastic sheets (241) on corresponding soluble plungers (2).
  2. 2. The large-drift diameter well cementation sliding sleeve system of a double-key intelligent switch according to claim 1, wherein the soluble plunger (2) further comprises a slip (22), the slip (22) is sleeved outside a ball seat (23), the outer wall of the ball seat (23) is matched with the inner wall of the slip (22) through an inclined plane, and a sealing ring of the outer wall of the ball seat (23) is positioned above the slip (22).
  3. 3. The double-key intelligent switch large-drift diameter well cementation sliding sleeve system according to claim 1, wherein the sliding sleeve (1) comprises an outer tube and an inner tube arranged in the outer tube, the outer tube comprises a first sleeve (11), a second sleeve (12) and a third sleeve (13) which are sequentially connected, the inner tube comprises a fourth sleeve (14) and a fifth sleeve (15) which are connected, the outer wall of the fourth sleeve (14) is tightly attached to the inner wall of the second sleeve (12), a gap (16) is formed between the outer wall of the fifth sleeve (15) and the inner wall of the second sleeve (12), the outer wall of the fifth sleeve (15) is tightly attached to the inner wall of the third sleeve (13), the second sleeve (12) is fixedly connected with the fourth sleeve (14) through a plurality of second pins (121), a plurality of fracturing holes (122) are circumferentially arrayed in the second sleeve (12), the fracturing holes (122) are located between the first sleeve (11) and the second pins (121), and two clamping grooves (141) are formed in the inner wall of the fourth sleeve (14).
  4. 4. A dual key smart switch large drift diameter cementing slip system as defined in claim 3, wherein the third casing (13) has an upper portion having an inner diameter greater than the lower portion thereof, the third casing (13) having an inner diameter that varies to support the fifth casing (15) when the second pin (121) is sheared and the inner tube is moved down.
  5. 5. A dual key intelligent switch large drift diameter cementing slip sleeve system according to claim 3, characterized in that a sealing ring is arranged between the first sleeve (11) and the inner wall of the second sleeve (12), a sealing ring is arranged between the third sleeve (13) and the inner wall of the second sleeve (12), and three sealing rings are arranged between the fourth sleeve (14) and the inner wall of the second sleeve (12).
  6. 6. A dual key smart switch large drift diameter cementing slip sleeve system as defined in claim 3, wherein the second sleeve (12) inner wall is provided with an annular shear groove (123), the shear groove (123) is located at the void (16), the fourth sleeve (14) outer wall is provided with an annular groove, two shear C rings (143) are provided in the groove, and when the second pin (121) is sheared, the inner tube moves down, the shear groove (123) is adapted to receive the shear C rings (143).
  7. 7. The double-key intelligent switch large-drift diameter well cementation sliding sleeve system according to claim 1, wherein the sliding sleeve (1) comprises a sixth sleeve (31), a seventh sleeve (32), an eighth sleeve (33) and a ninth sleeve (34), the outer wall of the sixth sleeve (31) is connected with the inner wall of the top end of the seventh sleeve (32), the inner wall of the bottom end of the seventh sleeve (32) is tightly attached to the outer wall of the top end of the eighth sleeve (33), the inner wall of the top end of the eighth sleeve (33) is connected with the outer wall of the bottom end of the sixth sleeve (31), the ninth sleeve (34) is located in a gap (313) between the sixth sleeve (31) and the seventh sleeve (32), the ninth sleeve (34) is connected with the outer wall of the sixth sleeve (31) through a plurality of third pins (341), the seventh sleeve (32) is circumferentially provided with a plurality of fracturing holes (122), the fracturing holes (122) are located below the third pins (341), the inner wall of the sixth sleeve (31) is circumferentially provided with a plurality of first through holes (311) and a plurality of second through holes (312), the first through holes (311) are communicated with the outer wall of the bottom end of the sixth sleeve (31), the first through holes (313) are communicated with the second through holes (33), and the positions of the eighth through holes (33) are corresponding to the positions of the eighth through holes (33) are located at the positions of the eighth through holes (141.
  8. 8. The dual-key intelligent switch large-drift diameter well cementation sliding sleeve system according to claim 7, wherein the outer wall of the ninth sleeve (34) is provided with two annular grooves which are respectively positioned above and below the fracturing hole (122), the inner wall of the ninth sleeve (34) is provided with two annular grooves which are respectively positioned above and below the fracturing hole (122), and sealing rings are respectively arranged in the four annular grooves.
  9. 9. The dual key smart switch large drift diameter cementing slip sleeve system of claim 8 wherein the outer wall of the ninth sleeve (34) is further provided with a third annular groove having two shear C-rings (143) disposed therein, the inner wall of the seventh sleeve (32) being provided with an annular shear groove (123), the shear groove (123) being configured to receive the shear C-rings (143) when the third pin (341) is sheared and the ninth sleeve (34) is moved downwardly.
  10. 10. The double-key intelligent switch large-drift diameter well cementation sliding sleeve system according to claim 1, wherein an inner ring is arranged on the inner wall of the elastic tube (24), the inner ring is located in a range corresponding to the two clamping grooves (141), the top surface of the inner ring is provided with a first inclined surface, the bottom end of the ball seat (23) extends to the inner ring, the outer wall of the bottom end of the ball seat (23) is provided with a second inclined surface matched with the first inclined surface, and the inner ring is divided into a plurality of elastic blocks (243) by the strip-shaped groove (242).

Description

Double-key intelligent switch large-drift-diameter well cementation sliding sleeve system Technical Field The invention relates to the technical field of oil and gas well fracturing, in particular to a double-key intelligent switch large-drift-diameter well cementation sliding sleeve system. Background In the fracturing operation of oil and gas wells, multi-layer staged fracturing is a common technique aimed at improving the recovery ratio of oil and gas. The key points of successful fracturing are that firstly, sealing is carried out, if the structural design and material selection or installation of the sliding sleeve and the soluble plunger are improper, the sealing between the sliding sleeve and the soluble plunger is not tight enough to influence the fracturing effect, secondly, the pressure bearing capacity is achieved, the soluble plunger is clamped in the sliding sleeve and is mainly used for bearing pressure by the point where the soluble plunger is clamped, and if the structural design of the sliding sleeve and the soluble plunger is improper, the stress under the high-pressure environment cannot be borne, and the soluble plunger is broken or fails. CN119288418A provides a full-drift diameter well cementation fracturing sliding sleeve system, the lengths of clamping grooves of all sliding sleeves are different, the sliding sleeves are put into a shaft according to the sequence that the lengths of the clamping grooves are gradually increased from top to bottom, then corresponding soluble plungers are sequentially put into the shaft, the soluble plungers are clamped in the sliding sleeves at specific positions, rubber of the rubber is expanded and clings to the inner wall of the sliding sleeve through extrusion of the rubber barrel, effective sealing is achieved, the bearing grade of the soluble plungers is 70MPa, firstly, bearing is carried out through an elastic sheet, the bottom ends of the elastic sheet can be downwards, the bearing capacity is improved, and secondly, the slips are opened and clamp the inner wall of the sliding sleeve, and the bearing effect can be achieved. However, the scheme still has the following problems that firstly, the sealing structure is complex, the reliability and the construction efficiency are affected to a certain extent, the simplification and the optimization are required to be further carried out, secondly, the grading operation is realized only by means of a single key structure, the distinguishable stages are limited, and the requirements of finer and multistage staged fracturing are difficult to meet. Disclosure of Invention In order to solve the defects in the prior art, the invention provides the double-key intelligent switch large-drift-diameter well cementation sliding sleeve system, which optimizes a sealing structure and increases the stage number of grading. In order to achieve the object of the invention, the following scheme is adopted: a double-key intelligent switch large-drift diameter well cementation sliding sleeve system comprises a plurality of soluble plungers and a plurality of sliding sleeves. The soluble plunger comprises a soluble ball, a ball seat, an elastic tube and a front seat, wherein the top opening of the ball seat is arranged, the inner wall of the ball seat is used for clamping the soluble ball, the outer wall of the ball seat is connected with the top end of the elastic tube through a plurality of first pins, a plurality of annular grooves are formed in the outer wall of the ball seat, a sealing ring is arranged in each annular groove and is positioned above the elastic tube, the front seat is connected to the bottom end of the elastic tube, two elastic rings and a plurality of strip-shaped grooves penetrating the elastic tube are formed in the outer wall of the elastic tube, each elastic ring is divided into a plurality of elastic sheets by the strip-shaped grooves, the bottom ends of the elastic sheets are in an acute angle structure, and the top ends of the elastic sheets are in an obtuse angle structure; The inner wall of the sliding sleeve is provided with two clamping grooves, and the bottom ends of the clamping grooves are in acute angle structures and are used for clamping corresponding elastic sheets on corresponding soluble plungers. Further, the soluble plunger further comprises a slip, the slip is sleeved outside the ball seat, the outer wall of the ball seat is matched with the inner wall of the slip through an inclined plane, and the sealing ring of the outer wall of the ball seat is positioned above the slip. Furthermore, the outer wall of the slip is provided with two rings of embedded posts, and the top end of the slip is provided with a plurality of notches. Further, the sliding sleeve comprises an outer tube and an inner tube arranged in the outer tube, the outer tube comprises a first sleeve, a second sleeve and a third sleeve which are sequentially connected, the inner tube comprises a fourth sleeve and a