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CN-121993078-A - Sealing rubber plug of blowout preventer and sealing performance monitoring method thereof

CN121993078ACN 121993078 ACN121993078 ACN 121993078ACN-121993078-A

Abstract

The invention relates to the technical field of oilfield drilling, in particular to a blowout preventer sealing rubber plug and a sealing performance monitoring method thereof, wherein the rubber plug comprises the following components: a first-stage inner fluid channel and a second-stage inner fluid channel are arranged in the rubber plug body; the sealing performance monitoring mechanism is arranged in a cavity of the rubber plug body or a central pipe of the blowout preventer and is used for detecting whether the inner fluid channel is in a closed state or not, and the cavity is communicated with the other ends of the first-stage inner fluid channel and the second-stage inner fluid channel. The rubber plug rubber core sealing performance monitoring and early warning are realized, waste caused by rubber core replacement in advance is avoided, the use cost is reduced, the risk caused by sealing failure is avoided, and the construction safety is ensured.

Inventors

  • LIU PENGCHENG
  • WANG HAIMIAO
  • XIA MENGYING
  • QI YUE
  • ZHANG ZHENHUA
  • BAI XIAOJIE
  • MA XIAOWEI
  • DUAN LIJUN
  • LIANG BIN
  • ZHENG LU
  • ZHU MINGKUN

Assignees

  • 大庆钻探工程有限公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260508
Application Date
20241031

Claims (18)

  1. 1. The sealing rubber plug of the blowout preventer is characterized by comprising a rubber plug body (9); at least one primary inner fluid channel (14) and at least one secondary inner fluid channel (15) are arranged in the rubber plug body (9); The positions of one end of the primary inner fluid channel (14) and one end of the secondary inner fluid channel (15) are close to the contact sealing part of the inner wall of the rubber plug body (9) and the drilling tool, the distance between one end of the primary inner fluid channel (14) and the inner wall of the rubber plug body (9) is a first preset distance, and the distance between one end of the secondary inner fluid channel (15) and the inner wall of the rubber plug body (9) is a second preset distance; wherein the first predetermined distance is greater than the second predetermined distance by a first predetermined value; The sealing performance monitoring mechanism is used for detecting whether the primary inner fluid channel (14) and the secondary inner fluid channel (15) are in a closed state or not, and the cavity is communicated with the other ends of the primary inner fluid channel (14) and the secondary inner fluid channel (15).
  2. 2. The blowout preventer seal plug according to claim 1, wherein the sealability detection mechanism (16) comprises a first pressure detection module and a second pressure detection module; the first pressure detection module is used for detecting the real-time pressure in the primary fluid channel (14); the second pressure detection module is used for detecting the real-time pressure in the secondary fluid channel (15).
  3. 3. The blowout preventer seal plug according to claim 2, wherein the sealability detection mechanism (16) further comprises a first humidity detection module and a second humidity detection module; The first humidity detection module is used for detecting real-time humidity in the primary fluid channel (14); The second humidity detection module is used for detecting real-time humidity in the secondary fluid channel (15).
  4. 4. The blowout preventer seal plug according to claim 1, wherein: The value range of the first preset distance is 5-15 mm.
  5. 5. The blowout preventer seal plug according to claim 1, wherein: the value range of the second preset distance is 15-25 mm.
  6. 6. The blowout preventer seal plug according to claim 1, wherein: the value range of the first preset value is 5-10 mm.
  7. 7. The blowout preventer sealing plug according to any one of claims 1-6, further comprising a screw (12) and an embedded nut: The embedded nut is arranged in the rubber plug body (9); The bottom end of the screw (12) penetrates through a bolt hole in the flange of the central tube of the blowout preventer and then is inserted into the rubber plug body (9), and the flange of the central tube (13) is fixedly connected with the rubber plug body (9) through threaded fit connection with the embedded nut.
  8. 8. The blowout preventer seal plug according to claim 7, wherein: the outer surface of the embedded nut is provided with rough lines for increasing friction force.
  9. 9. The blowout preventer seal plug according to claim 7, wherein: The side wall of the embedded nut, which is outside and close to the bottom end, is provided with an annular protruding part.
  10. 10. The blowout preventer seal plug according to claim 7, wherein: the two embedded nuts are arranged up and down, and the bottom ends of the screws (12) penetrate through the embedded nuts above and then are connected with the embedded nuts below; the screw (12) is in threaded fit with the two embedded nuts.
  11. 11. The blowout preventer sealing plug according to claim 7, further comprising an anti-drop clasp (11); the side wall of the rubber plug body (9) is provided with a buckle mounting hole; the anti-falling buckle (11) is C-shaped, an upper support arm of the C-shape is positioned above the flange, and a lower support arm of the C-shape is inserted into the buckle mounting hole; screw holes are formed in the upper support arm and the lower support arm of the anti-falling buckle (11), and the screws (12) respectively penetrate through the screw holes of the upper support arm and the lower support arm and then are connected with the embedded nuts.
  12. 12. The blowout preventer seal plug according to claim 1, wherein: the chamber communicates with the hollow interior of the central tube (13).
  13. 13. The blowout preventer seal plug according to any one of claims 1-12, further comprising a plug looseness detection mechanism; the rubber plug loosening detection mechanism is arranged between the flange and the rubber plug body (9); the rubber plug loosening detection mechanism is used for detecting real-time pressure between the rubber plug body (9) and the blowout preventer central tube flange.
  14. 14. The blowout preventer seal plug of claim 13, wherein the plug rattle detection mechanism comprises a third pressure detection module; The third pressure detection module is arranged between the contact surface of the flange and the rubber plug body (9).
  15. 15. A method of monitoring the sealing performance of a blowout preventer gland plug comprising the blowout preventer gland plug of any one of claims 1-14, comprising: acquiring an initial pressure value and an initial humidity value in a primary inner fluid channel (14) and a secondary inner fluid channel (15) in a rubber plug body (9) of the sealing rubber plug of the blowout preventer; controlling the starting of a sealing performance monitoring mechanism, and detecting the real-time pressure and/or the real-time humidity in the primary fluid channel (14) and the secondary fluid channel (15); Judging whether the real-time pressure in the primary fluid channel (14) exceeds the second preset value of the initial pressure corresponding to the interior of the primary fluid channel and/or whether the real-time humidity exceeds the third preset value of the initial humidity corresponding to the interior of the primary fluid channel, if so, the sealing performance is primary sealing failure; And judging whether the real-time pressure in the secondary fluid channel (15) exceeds the fourth preset value of the initial pressure corresponding to the interior of the secondary fluid channel and/or whether the real-time humidity exceeds the fifth preset value of the initial humidity corresponding to the interior of the secondary fluid channel, and if so, judging that the sealing performance is the secondary sealing failure.
  16. 16. The method of monitoring the sealing performance of a blowout preventer sealing plug of claim 15, wherein: acquiring an initial pressure value and an initial humidity value of the hollow interior of the central tube (13); The cavity is communicated with the hollow interior of the central tube (13), and the sealing performance monitoring mechanism detects real-time pressure and/or real-time humidity in the hollow interior of the central tube (13); and judging whether the real-time pressure in the hollow interior of the central tube (13) exceeds the initial pressure sixth preset value corresponding to the interior of the central tube and/or whether the real-time humidity exceeds the initial humidity seventh preset value corresponding to the interior of the central tube, and if so, judging that the sealing performance is completely invalid.
  17. 17. The method of monitoring the sealing performance of a blowout preventer seal plug according to claim 15 or 16, wherein: Acquiring an initial connection pressure value between the flange and the rubber plug body (9); a third pressure detection module is arranged between the contact surface of the flange and the rubber plug body (9), and the third pressure detection module detects real-time connection pressure between the contact surface of the flange and the rubber plug body (9); Judging whether the real-time connection pressure exceeds an eighth preset value of the initial connection pressure, and if so, loosening occurs between the flange and the rubber plug body (9).
  18. 18. The method of monitoring the sealing performance of a blowout preventer sealing plug of claim 17, wherein: and if the judgment result is that the primary seal fails, the secondary seal fails, the seal fails completely or looseness occurs between the flange and the rubber plug body (9), the alarm mechanism is controlled to start for alarm.

Description

Sealing rubber plug of blowout preventer and sealing performance monitoring method thereof Technical Field The invention relates to the technical field of oilfield drilling, in particular to a blowout preventer sealing rubber plug and a sealing performance monitoring method thereof. Background The pressure control drilling technology is applied in drilling construction, particularly in narrow window stratum, high pressure stratum and the like, so that the drilling safety can be improved, the well construction cost can be reduced, the well control risk can be reduced, and the yield can be improved. The pressure-controlled drilling process equipment mainly comprises a rotary blowout preventer, a throttle manifold, a return pressure pump and the like. The rotary blowout preventer is installed at a wellhead, is core equipment for pressure-controlled drilling, and has the main functions of sealing the wellhead, providing a drilling tool channel and realizing sealing between the drilling tool and the wellhead. The rotary blowout preventer has an active sealing mode, a passive sealing mode and a mixed mode, and the two modes depend on a rubber core to hold the drilling tool tightly. Currently, passive rotary blowout preventers are commonly used, and the passive blowout preventers are structurally shown in fig. 1 and comprise a driver 1, an upper core barrel 2, a rubberizing core 3, a rotary assembly 4, a clamping hoop 5, a shell 6, a lower rubber core 7 and a connecting flange 8. Since it is directly installed on the wellhead, the rotary assembly 4 works directly in the wellbore, and the lower rubber core (rubber plug) 7 is connected with the rotary assembly 4 by bolts. In use, the drilling tool is required to move axially, and the upper and lower cores 3 and 7 must be firmly gripped to achieve a sealing effect and to provide rotational power. With the increase of the service time, the abrasion loss of the rubber core is inevitably increased, and the sealing performance is reduced. At present, the rubber core is replaced after leakage or periodically replaced according to a certain service time. The first case causes an unplanned downtime, increasing the drilling risk and the drilling costs, and the second case causes a large number of cores, which also have good sealing properties, to be abandoned, increasing the application costs of the pressure-controlled drilling technique. Disclosure of Invention The invention provides a sealing rubber plug of a blowout preventer and a sealing performance monitoring method thereof, which aim to solve the problems that the sealing performance of the sealing rubber plug cannot be monitored in the prior art, so that sealing failure cannot be found in time or the use cost is increased due to frequent replacement of the rubber plug. According to one aspect of the present invention, there is provided a blowout preventer seal plug comprising a plug body; At least one primary internal fluid channel and at least one secondary internal fluid channel are arranged in the rubber plug body; The positions of one end of the primary inner fluid channel and one end of the secondary inner fluid channel are close to the contact sealing part of the inner wall of the rubber plug body and the drilling tool, the distance between one end of the primary inner fluid channel and the inner wall of the rubber plug body is a first preset distance, and the distance between one end of the secondary inner fluid channel and the inner wall of the rubber plug body is a second preset distance; wherein the first predetermined distance is greater than the second predetermined distance by a first predetermined value; The sealing performance monitoring mechanism is used for detecting whether the primary inner fluid channel and the secondary inner fluid channel are in a closed state or not, and the cavity is communicated with the other ends of the primary inner fluid channel and the secondary inner fluid channel. Preferably, the sealing performance detection mechanism comprises a first pressure detection module and a second pressure detection module; the first pressure detection module is used for detecting the real-time pressure in the primary fluid channel; the second pressure detection module is used for detecting the real-time pressure in the secondary fluid channel. Preferably, the sealing performance detection mechanism further comprises a first humidity detection module and a second humidity detection module; The first humidity detection module is used for detecting real-time humidity in the primary fluid channel; the second humidity detection module is used for detecting real-time humidity in the secondary fluid channel. Preferably, the value range of the first preset distance is 5-15 mm. Preferably, the value range of the second preset distance is 15-25 mm. Preferably, the value range of the first preset value is 5-10 mm. Preferably, the screw and the embedded nut are as follows: the embedded nut is arranged