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CN-122014152-A - High-temperature-resistant corrosion-resistant rubber plug

CN122014152ACN 122014152 ACN122014152 ACN 122014152ACN-122014152-A

Abstract

The invention relates to the technical field of well cementation rubber plugs, in particular to a high-temperature-resistant corrosion-resistant rubber plug, which comprises a lower rubber plug main body and an upper rubber plug main body, wherein the top end part of the lower rubber plug main body is provided with a funnel-shaped round table guide part which is gradually expanded upwards in an axial direction, three annular mud scraping wings for scraping drilling fluid on the inner wall of a shaft are arranged outside the lower rubber plug main body, and an expansion locking assembly is arranged between every two annular mud scraping wings.

Inventors

  • FAN BO
  • SUN YIQIN

Assignees

  • 青岛海蚨奥工贸有限公司

Dates

Publication Date
20260512
Application Date
20260402

Claims (8)

  1. 1. The high-temperature-resistant corrosion-resistant rubber plug comprises a lower rubber plug main body (10) and an upper rubber plug main body (20), wherein the lower rubber plug main body (10) and the upper rubber plug main body (20) are integrally formed into an integral component, and the high-temperature-resistant corrosion-resistant rubber plug is characterized in that a funnel-shaped round platform guide part (12) which is gradually expanded upwards in an axial direction is arranged at the top end part of the lower rubber plug main body (10), an upper groove opening (13) which is gradually reduced downwards is formed in the upper end of the funnel-shaped round platform guide part (12), a central flow hole (16) is formed in the lower rubber plug main body (10), a rubber diaphragm is arranged at the bottom end in the central flow hole (16) and used for isolating cement paste, a conical guide part (14) used for guiding is arranged at the lower end of the lower rubber plug main body (10), and three annular mud scraping wings (11) used for scraping drilling fluid on the inner wall of a shaft are arranged outside the lower rubber plug main body (10); The funnel-shaped round table guide part (12), the annular mud scraping wings (11) and the conical guide part (14) form an integrated fit from top to bottom along the axial direction of the lower rubber plug main body (10); An expansion locking component for assisting the fixation of the lower rubber plug main body (10) and the upper rubber plug main body (20) is arranged between every two annular mud scraping wings (11); Each expansion locking assembly comprises an embedded groove (30), the embedded groove (30) is formed in the outer portion of the lower rubber plug main body (10), an inner pressure ring bag (31) is movably connected in the embedded groove (30), and an expansion filling ring (32) used for being abutted against the inner wall of a shaft is arranged outside the inner pressure ring bag (31); The upper rubber plug main body (20) comprises an upper drill guide section (21) and a lower embedded plug section (22).
  2. 2. The high temperature resistant and corrosion resistant rubber plug according to claim 1, wherein a plurality of clamping parts (15) are arranged outside the conical guide part (14), and the plurality of clamping parts (15) are annularly and equally arranged outside the conical guide part (14).
  3. 3. The high temperature resistant and corrosion resistant rubber plug according to claim 1, wherein the upper end of the upper drill guiding section (21) is provided with a guiding head (26) and a conical notch (27) for guiding a drill, the conical notch (27) is arranged at the upper end of the guiding head (26), and the lower end of the lower embedded plug section (22) is provided with a plug end (23) for guiding the lower embedded plug section to be embedded into the central flow hole (16); The lower end of the plug-in end part (23) is provided with a return part (24), the outer diameter of the return part (24) is larger than the outer diameter of the plug-in end part (23) and the inner diameter of the central flow hole (16), and the return part (24) is in a downward tapered shape.
  4. 4. A high temperature resistant corrosion resistant rubber plug according to claim 3, wherein a plurality of locking teeth (25) are arranged on one side of the outer part of the return stop part (24) close to the plugging end part (23), and the plurality of locking teeth (25) are annularly and equally arranged outside the return stop part (24).
  5. 5. The high-temperature-resistant corrosion-resistant rubber plug according to claim 3, wherein a plurality of vertical through slots (28) for dredging are formed in the periphery of the guide head (26), and the plurality of vertical through slots (28) are annularly arranged on the periphery of the guide head (26) in an equally-divided mode.
  6. 6. A high temperature resistant corrosion resistant rubber plug according to claim 3, wherein the side of the lower embedded plug section (22) close to the upper drill guiding section (21) is provided with a connecting flat pressing part (29) which tapers downwards, and after the upper rubber plug main body (20) and the lower rubber plug main body (10) are connected in an embedded manner.
  7. 7. The high temperature resistant and corrosion resistant rubber plug according to claim 6, wherein a pressure lock assembly for assisting the upper rubber plug main body (20) to be further fixed on the inner wall of the shaft is arranged between the guide head (26) and the connecting flat pressure part (29); The pressure lock assembly comprises a pressure stabilizing upper ring (40), a fixed ring part (41), a buffering convex ring (44) and two clamping ring parts (45), wherein the fixed ring part (41) is arranged outside the upper drill bit guide section (21), the two clamping ring parts (45) are respectively arranged on the upper side and the lower side of the buffering convex ring (44), and the two clamping ring parts (45) are respectively connected with the pressure stabilizing upper ring (40) and the fixed ring part (41).
  8. 8. The high temperature resistant and corrosion resistant rubber plug according to claim 7, wherein a hollow slot (46) is formed on one side of the pressure stabilizing upper ring (40) close to the fixed ring part (41), after the pressure stabilizing upper ring (40) is pressed on the outer part of the upper drill bit guiding section (21) to move downwards, the pressure stabilizing upper ring (40) drives the clamping ring part (45) and enables the buffer convex ring (44) to transversely compress and expand in the two hollow slots (46), and the expansion of the buffer convex ring (44) in the two hollow slots (46) tightly locks the pressure stabilizing upper ring (40) and the fixed ring part (41); The side of the upper stabilizing ring (40) close to the fixed ring part (41) is provided with a radial expansion ring (42), and the side of the fixed ring part (41) close to the upper stabilizing ring (40) is provided with a notch (43).

Description

High-temperature-resistant corrosion-resistant rubber plug Technical Field The invention relates to the technical field of cementing rubber plugs, in particular to a high-temperature-resistant corrosion-resistant rubber plug. Background In the low-carbon exploitation construction process, the rubber plug is a key tool for guaranteeing cement paste displacement efficiency and shaft sealing integrity during cementing operation, the conventional rubber plug generally adopts an integrated rubber structure, and forms interference fit with the inner wall of the shaft by means of annular mud scraping wings at the periphery of the rubber plug, so that the functions of scraping drilling fluid mud cakes and isolating cement paste are realized, however, as the depth of the shaft is increased and the working conditions under the shaft are complicated, the conventional rubber plug structure is obviously insufficient in practical application, the mud scraping wings at the periphery of the rubber plug are easily worn under the long-time descending and high-pressure fluid flushing action, the fit degree with the inner wall of the shaft is reduced, the friction locking force is weakened, and the adhesive force with the inner wall of the shaft is insufficient when the rubber plug is fixed at a float collar at the bottom of the shaft, so that reliable anchoring is difficult to be formed, and the axial fixing effect of the rubber plug is weakened. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides the high-temperature-resistant corrosion-resistant rubber plug. The invention provides a high-temperature-resistant corrosion-resistant rubber plug, which comprises a lower rubber plug main body and an upper rubber plug main body, wherein the lower rubber plug main body and the upper rubber plug main body are integrally formed into an integral component, the lower rubber plug main body and the upper rubber plug main body are both made of conventional high-temperature-resistant corrosion-resistant rubber materials, the top end part of the lower rubber plug main body is provided with a funnel-shaped round table guide part which gradually expands upwards in the axial direction, the upper end of the funnel-shaped round table guide part is provided with an upper groove opening which gradually expands downwards, the inside of the lower rubber plug main body is provided with a central flow hole, the bottom end of the inside of the central flow hole is provided with a rubber diaphragm for isolating cement paste, the lower end of the lower rubber plug main body is provided with a conical guide part for guiding, the outside of the conical guide part is provided with a plurality of clamping parts, the plurality of clamping parts are annularly and equally arranged outside the conical guide part, the outside of the lower rubber plug main body is provided with three annular mud scraping wings for scraping drilling fluid on the inner wall of a shaft, and the funnel-shaped mud scraping wings and the conical guide part axially form an integral fit with the lower rubber plug main body from top to bottom; Every two annular scrape all be provided with between the mud wing and be used for assisting down plug main part and go up plug main part and fix expansion locking subassembly, every expansion locking subassembly is including interior caulking groove mouth, interior caulking groove mouth sets up in the outside of plug main part down, and interior caulking groove mouth inside is established to the trapezoidal annular round hole of expanding gradually, interior caulking groove mouth's inside swing joint has interior pressure ring bag, interior pressure ring bag is kept away from the inside one end of caulking groove mouth and is extended to between two annular and scrape the mud wing, interior pressure ring bag's outside is equipped with and is used for with the expansion packing ring that supports tightly of pit shaft inner wall, the expansion packing ring sets up the position between two annular and scrapes the mud wing, interior pressure ring bag is integrated into one piece configuration with the expansion packing ring. As the preferable technical scheme of the invention, the upper rubber plug main body comprises an upper drill bit guide section and a lower embedded plug section, the upper end of the upper drill bit guide section is provided with a guide head and a conical notch for guiding a drill bit, the conical notch is arranged at the upper end of the guide head, the lower end of the lower embedded plug section is provided with a plug end for guiding the lower embedded plug section to be embedded into the central flow hole, the lower end of the plug end is provided with a return stop part, the diameter of the return stop part is larger than that of the lower end of the plug end, the return stop part is in a downward tapered shape, one side, close to the plug end, of the outside of the return stop p