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CN-122014148-A - Float collar float shoe device for well cementation

CN122014148ACN 122014148 ACN122014148 ACN 122014148ACN-122014148-A

Abstract

The invention relates to a float collar float shoe device for well cementation, which relates to the technical field of petroleum exploitation and comprises a shell, wherein a valve groove is formed in the shell, a valve ball is inserted in the valve groove, a valve rod is fixedly connected to the bottom of the valve ball, the valve rod is in sliding connection with the bottom of the shell, a valve spring is sleeved on the valve rod, two ends of the valve spring are respectively and fixedly connected with the shell and the valve ball, a sealing component is arranged on the shell and comprises a locking component and an anti-adhesion component, the locking component is used for mechanically locking the valve ball and sealing and shielding the matching surface of the valve ball and the valve groove, and through the operation of the sealing component and the insertion rigid locking limit of a half-ring plate, the valve ball always maintains an accurate sealing position in a non-working state and is matched with an annular structure formed by the half-ring plate to seal and block a matching gap between the valve groove and the valve ball, so that the double sealing effect of locking and blocking of the valve ball is realized, unexpected sealing failure in a non-working state is avoided, and the gap leakage problem is solved.

Inventors

  • SUN JIANRU
  • BAI XUEJIA

Assignees

  • 菲哲石油装备(辽宁)有限公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (8)

  1. 1. The float collar float shoe device for well cementation comprises a shell (11), a valve groove (12) is formed in the shell (11), a valve ball (13) is inserted in the valve groove (12), a valve rod (14) is fixedly connected to the bottom of the valve ball (13), the valve rod (14) is slidably connected with the bottom of the shell (11), a valve spring (15) is sleeved on the valve rod (14), two ends of the valve spring (15) are fixedly connected with the shell (11) and the valve ball (13) respectively, and the float collar float shoe device is characterized in that a sealing assembly is arranged on the shell (11) and comprises a locking part and an anti-adhesion part, the locking part is used for mechanically locking the valve ball (13) and sealing and shielding the matching surface of the valve ball (13) and the valve groove (12), the anti-adhesion part is used for preventing the retention of slurry particles, the locking part comprises four semi-ring plates (27), the two semi-ring plates (27) on the same horizontal plane are mutually clamped and matched, the anti-adhesion part comprises eight cams (222), and the cams (222) are in extrusion fit with the valve ball (13).
  2. 2. The floating collar floating shoe device for well cementation according to claim 1, wherein the locking component further comprises two vertical grooves (21), the two vertical grooves (21) are symmetrically formed in the shell (11), two transverse grooves (22) are symmetrically formed in one side, close to the valve groove (12), of the groove wall of each vertical groove (21), a ring groove I (23) is formed in the groove wall of the two transverse grooves (22) at the top, a U-shaped rod (24) is connected in the two transverse grooves (22) at the same side in a sliding mode, two guide rods I (25) are symmetrically connected in a sliding mode, two ends of each guide rod I (25) are fixedly connected with the groove wall of the vertical groove (21), a spring I (26) is sleeved on each guide rod I (25), two ends of the spring I (26) are fixedly connected with the groove wall of the vertical groove (21) and the U-shaped rod (24) respectively, four semi-annular plates (27) are fixedly connected to the top and two semi-annular plates (28) of the two U-shaped rods (24) respectively, and two semi-annular plates (28) are fixedly connected to the bottom surfaces of each semi-annular plate (27).
  3. 3. The floating collar floating shoe device for well cementation according to claim 1, wherein two annular grooves (29) are formed in the valve ball (13), two slots (210) are symmetrically formed in the groove wall of each annular groove (29), a sliding rod (211) is slidably connected in each vertical groove (21), the top ends of the sliding rods (211) penetrate out of the casing (11), a triangular plate (212) is fixedly connected to the bottom ends of the two sliding rods (211), a pressing plate (213) is fixedly connected to the top ends of the two sliding rods (211), a rubber ring I (214) is fixedly connected to the lower surface of the two pressing plates (213), the bottom ends of the two rubber rings I (214) are fixedly connected with the casing (11), two guide rods II (215) are symmetrically connected to the top ends of the two triangular plates (212), the top ends of the guide rods II (215) penetrate out of the casing (11), the top ends of the guide rods II (215) are fixedly connected with adjacent pressing plates (213), a spring II (216) is sleeved on each guide rod II (215), and the two spring II (216) are fixedly connected with the groove walls of the two vertical grooves (21).
  4. 4. The floating collar and floating shoe device for well cementation of claim 1, wherein the anti-adhesion component comprises a telescopic pipe (217), the telescopic pipe (217) is sleeved on the valve rod (14), the telescopic pipe (217) comprises a fixed pipe and a telescopic pipe, the telescopic pipe of the telescopic pipe (217) is fixedly connected with the bottom of the valve ball (13), the fixed pipe of the telescopic pipe (217) is fixedly connected with the shell (11), a rubber ring II (218) is sleeved on the fixed pipe of the telescopic pipe (217), and two ends of the rubber ring II (218) are respectively fixedly connected with the telescopic pipe of the telescopic pipe (217) and the shell (11).
  5. 5. The floating collar floating shoe device for well cementation of claim 1, wherein four supporting frames (219) are fixedly connected in a ring shape in the shell (11), each supporting frame (219) is rotatably connected with a rotating shaft (220), a plurality of side plates (221) are fixedly connected to each rotating shaft (220) in a ring-shaped array, eight cams (222) are arranged in pairs in a group, and two cams (222) of the same group are symmetrically and fixedly connected to two ends of the rotating shaft (220).
  6. 6. A floating collar device for well cementation as claimed in claim 2, wherein the half-ring plate (27) is in plug-in fit with the first annular groove (23), the half-ring plate (27) is in plug-in fit with the second annular groove (29), and the inserting rod (28) is in plug-in fit with the inserting groove (210).
  7. 7. A floating collar floating shoe device for well cementation according to claim 3, characterized in that a through groove is formed in one side of the U-shaped rod (24) far away from the semi-annular plate (27), and the groove wall of the through groove of the U-shaped rod (24) is in extrusion fit with the inclined plane of the triangular plate (212).
  8. 8. A floating collar device for well cementation as claimed in claim 1, wherein the cam (222) is made of rubber.

Description

Float collar float shoe device for well cementation Technical Field The invention relates to the technical field of petroleum exploitation, in particular to a float collar float shoe device for well cementation. Background Float collar float shoes are key tools in petroleum drilling and cementing operations and are typically installed at the end (float shoe) or mid-section (float collar) of a casing string. The guide shoe integrates the guide function of the guide shoe and the unidirectional flow control function of the back pressure valve, and mainly aims to guide the casing to smoothly enter the well in the casing running process and realize unidirectional flow of drilling fluid and cement slurry through the valve ball or valve core structure inside the guide shoe. The buoyancy force of the casing string can be effectively adjusted, more importantly, after the cementing operation is finished, the pipeline can be immediately sealed, and cement paste is prevented from flowing back into the casing, so that a downhole cement plug meeting design requirements is formed, the cementing quality of the casing shoe is ensured, and the foundation for success of the cementing operation is provided. However, conventional float collar float shoes still face significant challenges in practical applications. The core back pressure valve structure, particularly the valve ball system, is not reliable enough in complex downhole environments. On the one hand, the valve ball lacks an effective mechanical locking mechanism in a non-working state, and is easy to accidentally jack up when encountering abnormal high pressure, severe vibration or pressure fluctuation in the pit, so that the sealing is failed in advance, the cement paste flows backwards, and the well cementation operation is failed. On the other hand, the sealing matching surface of the valve ball and the valve seat is easy to wear after being subjected to erosion of slurry containing solid-phase particles for a long time, and meanwhile, impurities are easy to adhere to the surface of the valve ball or to be blocked in a clearance of a moving part, so that the valve ball cannot be reset normally or is not sealed tightly. Disclosure of Invention The utility model provides a float collar float shoe device for well cementation, including the casing, the valve groove has been seted up in the casing, the valve groove interpolation has the valve ball, the bottom fixedly connected with valve rod of valve ball, the bottom sliding connection of valve rod and casing, the cover has the valve spring on the valve rod, the both ends of valve spring respectively with casing and valve ball fixed connection, be provided with seal assembly on the casing, seal assembly includes locking component and anti-adhesion part, locking component is used for carrying out mechanical locking to the valve ball and seals the cooperation face of valve ball and valve groove and shields, anti-adhesion part is used for preventing the stay of thick liquid granule, locking component includes four semi-annular plates, two semi-annular plates of same horizontal plane joint cooperation each other, anti-adhesion part includes eight cams, cam and valve ball extrusion fit. Further, the locking part further comprises two vertical grooves symmetrically arranged on the shell, two horizontal grooves are respectively and symmetrically arranged on one side of the groove wall of each vertical groove close to the valve groove in a vertical array, a first annular groove is commonly arranged on the groove walls of the two horizontal grooves at the top, a U-shaped rod is commonly and slidably connected in the two horizontal grooves at the same side, two first guide rods are respectively and symmetrically connected on the two U-shaped rods in a sliding manner, two ends of each first guide rod are fixedly connected with the groove walls of the vertical grooves, a first spring is respectively arranged on each first guide rod in a sleeved mode, two ends of each first spring are respectively and fixedly connected with the groove walls of the vertical grooves and the U-shaped rods, four semi-ring plates are respectively and fixedly connected to the top and bottom two sides of the two U-shaped rods, and a plug rod is respectively and fixedly connected to the inner ring surface of each semi-ring plate. Further, two ring grooves II are formed in the valve ball, two slots are symmetrically formed in the groove wall of each ring groove II, a sliding rod is slidably connected in each vertical groove, the top end of the sliding rod penetrates out of the shell, a triangular plate is fixedly connected to the bottom ends of the two sliding rods, a pressing plate is fixedly connected to the top ends of the two sliding rods, a first rubber ring is fixedly connected to the lower surface of the two pressing plates, the bottom ends of the first rubber ring are fixedly connected with the shell, two guide rods II are symmetrically and fixedly