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CN-121993098-A - Kelly bar plug valve for offshore oilfield drilling

CN121993098ACN 121993098 ACN121993098 ACN 121993098ACN-121993098-A

Abstract

The invention discloses a kelly bar plug valve for an ocean oilfield drilling, which relates to the technical field of oilfield drilling valves and comprises a double-cavity valve body, wherein the double-cavity valve body is provided with an upper cavity and a lower cavity which are distributed at intervals along the axial direction, two ends of the double-cavity valve body are respectively bolted with an I-shaped upper end cover and an I-shaped lower end cover, the I-shaped upper end cover and an upper end opening of the double-cavity valve body enclose a closed upper mounting cavity, and the I-shaped lower end cover and a lower end opening of the double-cavity valve body enclose a closed lower mounting cavity. When the two cock liquid control structures are controlled, the electric double-position synchronous driving structure controls the two cock liquid control structures to act simultaneously under the low-pressure well spraying state so as to enable the internal channel of the drill string to be closed, and the hydraulic rotary driving structure controls the cock liquid control structure to act under the high-pressure well spraying state under the supply of an external hydraulic pump station, so that the problems that the high-pressure blocking effect is limited and the switching is difficult under the high-pressure difference in the ocean high-pressure drilling environment of the traditional single-valve ball plug valve are solved.

Inventors

  • YANG JIACHENG

Assignees

  • 牡丹江北方油田机械有限公司

Dates

Publication Date
20260508
Application Date
20260312

Claims (10)

  1. 1. The utility model provides an ocean oil field bores adopts kelly plug valve which characterized in that includes: The double-cavity valve body (1) is provided with an upper cavity and a lower cavity which are distributed at intervals along the axial direction, the two ends of the double-cavity valve body (1) are respectively bolted with an I-shaped upper end cover (2) and an I-shaped lower end cover (3), the I-shaped upper end cover (2) and the upper end opening of the double-cavity valve body (1) enclose a closed upper mounting cavity, and the I-shaped lower end cover (3) and the lower end opening of the double-cavity valve body (1) enclose a closed lower mounting cavity; The two cock liquid control structures (4) are respectively arranged in the upper mounting cavity and the lower mounting cavity, two encoders (6) are arranged on the outer wall of one side of the double-cavity valve body (1), and the encoders (6) are used for detecting the rotation angle of the cock liquid control structures (4) in real time and outputting angle signals; The straight-mouth type side shell (5), the straight-mouth type side shell (5) is installed on the outer wall of the other side of the double-cavity valve body (1), a support plate (51) is fixed on the outer wall of one side of the straight-mouth type side shell (5) far away from the double-cavity valve body (1), two hydraulic rotation driving structures (7) are installed on the outer wall of one side of the support plate (51) along the axial direction, and the power output end of each hydraulic rotation driving structure (7) is in transmission connection with one of the cock liquid control structures (4) and is used for outputting torque under the working condition of high pressure difference so as to drive the corresponding cock liquid control structure (4) to overcome the friction force generated by the high pressure difference and rotate; The electric double-position synchronous driving structure (8) is arranged on the outer wall of one side of the support plate (51) and is arranged between the two hydraulic rotary driving structures (7), and the power output end of the electric double-position synchronous driving structure (8) is simultaneously in transmission connection with the two cock liquid control structures (4) and is used for driving the two cock liquid control structures (4) to synchronously rotate under the low-pressure difference working condition.
  2. 2. The kelly plug valve for marine oilfield drilling according to claim 1, wherein an outer shielding cover (9) is bolted to the edge position of the outer wall of one side of the straight-mouth side shell (5) far away from the double-cavity valve body (1), the outer shielding cover (9) is used for wrapping and protecting a hydraulic rotary driving structure (7) and an electric double-position synchronous driving structure (8), two opening parts (91) are arranged on the outer wall of one side of the outer shielding cover (9), and liquid injection cleaning structures (10) are arranged at the upper position and the lower position of the double-cavity valve body (1).
  3. 3. The kelly plug valve for the offshore oilfield drilling according to claim 1, wherein the plug liquid control structure (4) in the upper mounting cavity comprises a first plug cover (41), a second plug cover (42), a valve ball body (43) and a long shaft (45), the first plug cover (41) and the second plug cover (42) are respectively mounted at the lower end of the I-shaped upper end cover (2) and the upper end of the double-cavity valve body (1), the valve ball body (43) is rotatably mounted between the first plug cover (41) and the second plug cover (42), a diversion hole (44) is formed in the valve ball body (43), the long shaft (45) is rotatably mounted at one side of the inside of the double-cavity valve body (1), one end of the long shaft (45) penetrates through the outside of the straight-mouth type side shell (5) and is connected with the hydraulic rotary driving structure (7) and the electric double-position synchronous driving structure (8), the other end of the long shaft (45) is clamped with the outer wall of one side of the valve ball body (43), and the short shaft (46) is fixedly mounted on the outer wall of the other side of the ball body (43) and is connected with one end of the valve encoder (6).
  4. 4. A kelly bar plug valve for offshore oilfield drilling according to claim 3, wherein at least one sealing ring (411) is inlaid on the inner walls of the first blocking cover (41) and the second blocking cover (42), the sealing ring (411) is abutted against the outer wall of the valve ball body (43), and the top end and the bottom end of the valve ball body (43) are respectively provided with a concave part (431) gradually extending towards the center direction.
  5. 5. A kelly bar plug valve for offshore oilfield drilling according to claim 3, wherein the electric double-position synchronous driving structure (8) comprises an end plate (81) fixedly connected between two hydraulic rotary driving structures (7), a motor (82) installed on the outer wall of one side of the end plate (81) close to the support plate (51), and a pair of driven gear shafts (84) rotatably installed on the outer wall of the other side of the end plate (81) through bearings, a sprocket reduction transmission structure for power transmission is arranged between the driven gear shafts (84) and the end parts of the long shafts (45), a driving gear post (83) is fixed on an output shaft of the motor (82), and the driving gear post (83) is meshed with one driven gear shaft (84).
  6. 6. The kelly bar plug valve for offshore oilfield drilling according to claim 5, wherein the sprocket reduction transmission structure comprises a driving sprocket (87) fixed on the end of the driven gear shaft (84) and a reduction sprocket (85) fixed on the end of the long shaft (45), a transmission chain (86) is connected between the reduction sprocket (85) and the driving sprocket (87), and at least one protruding key (47) extending along the axial direction is integrally formed on the outer wall of the long shaft (45).
  7. 7. The kelly plug valve for offshore oilfield drilling according to claim 6, wherein the hydraulic rotation driving structure (7) comprises an annular end seat (71) fixedly connected to one side outer wall of the support plate (51), a hollow sealing cover (72) mounted on the outer wall of the opening end of the annular end seat (71) in a sealing and bolting manner, and an inner groove hollow rotating shaft (76) rotatably mounted on the annular end seat (71) and the hollow sealing cover (72) at the inner central axis position through a ball bearing, the inner groove hollow rotating shaft (76) and the long shaft (45) are matched through a convex key (47), an annular oil cavity (73) is arranged between the annular end seat (71) and the hollow sealing cover (72), a connecting ring (78) is fixed on the outer wall of the inner groove hollow rotating shaft (76) at the annular oil cavity (73), an ear plate (79) is fixed on one side outer wall of the connecting ring (78), the ear plate (79) is in sliding fit with the annular oil cavity (73), and one end inside the hollow sealing cover (72) is provided with a dynamic sealing (77) which keeps a coaxial state with the inner groove hollow rotating shaft (76).
  8. 8. The kelly bar plug valve for marine oilfield drilling according to claim 7, wherein a main blocking head (74) and a secondary blocking head (75) which are distributed at intervals are fixed on the inner wall of one side of the annular end seat (71), a first cavity (710) is arranged between the main blocking head (74) and the ear plate (79), a second cavity (711) is arranged between the secondary blocking head (75) and the ear plate (79), a first liquid inlet connector (712) and a second liquid inlet connector (713) are arranged on the outer wall of one side of the hollow sealing cover (72), and the first liquid inlet connector (712) and the second liquid inlet connector (713) are respectively used for feeding hydraulic oil into the first cavity (710) and the second cavity (711).
  9. 9. The kelly plug valve for offshore oilfield drilling according to claim 7, wherein the outer wall of one side of the hollow sealing cover (72) far away from the annular end seat (71) is provided with a step part, and the end plate (81) is fixedly arranged between the step parts of the two hollow sealing covers (72).
  10. 10. The kelly bar plug valve for offshore oilfield drilling of claim 2, wherein the fluid injection cleaning structure (10) comprises at least one internal thread fluid inlet inclined hole (1001) penetrating into the inside of the double-cavity valve body (1) and an external thread plugging plug (1002) screwed into the internal thread fluid inlet inclined hole (1001), and the external thread plugging plug (1002) is detached from the internal thread fluid inlet inclined hole (1001) and the cleaning medium is injected into the double-cavity valve body (1) through the internal thread fluid inlet inclined hole (1001).

Description

Kelly bar plug valve for offshore oilfield drilling Technical Field The invention relates to the technical field of oilfield drilling valves, in particular to a kelly plug valve for ocean oilfield drilling. Background The kelly plug valve is used as a well control safety component in a drilling string system in offshore oilfield drilling operation, is a high-strength manual ball valve capable of realizing rapid switching through rotation, is usually arranged at the upper end and the lower end of the kelly in pairs, can be used for preventing a platform from being polluted by mud splash and guaranteeing personnel operation safety by immediately closing the plug valve when abnormal high-pressure stratum fluid floods into the drill string during drilling, forcibly cutting off a channel of the fluid ascending of a drill rod center Kong Zheyi, preventing dangerous well blowout from being in an initial stage, thereby avoiding accidents caused by direct ejection of high-pressure oil airflow from a wellhead kelly, and also can be used for closing a lower plug when the kelly is lifted or connected in daily operation, and can be used for safely discharging the pressure in the kelly to prevent the mud from splashing and polluting the platform; The utility model discloses an ocean oilfield drilling adopts a kelly bar plug valve as disclosed in the authority bulletin number CN113503142B, which comprises a pipe body, a transverse through groove communicated with the inner cavity of the middle part of the pipe body is formed in the pipe body, an outer sealing sleeve is movably sleeved in the transverse through groove, an inner sealing rotary column is sleeved in an inner bearing of the outer sealing sleeve, a middle through hole positioned at the inner cavity of the middle part of the pipe body is formed in the inner sealing rotary column, a linkage rotary rod is arranged on one side of the transverse through groove, the linkage rotary rod can drive the inner sealing rotary column to rotate, a transverse through groove communicated with the inner groove of the middle part of the pipe body is formed in the pipe body, and the structural design of the outer sealing sleeve and the inner sealing rotary column is arranged in the transverse through groove; The above technical solution can be seen that the arrangement and the use manner of the kelly plug valve are similar to the prior art, namely, the opening and closing of the valve are realized by rotating the valve rod, the fluid is blocked by only relying on the sealing pair formed by one ball and two valve seats (an inlet end and an outlet end), when blowout occurs in the drill string, high-pressure fluid upwards gushes from the bottom of the drill string, directly impacts the downstream side of the valve ball, at the moment, the pressure sealing-assisting effect exists, but all sealing loads are concentrated on the contact surface of the valve seat at the outlet end and the ball, once the sealing surface fails due to long-term abrasion, corrosion or tiny deformation under high-pressure impact, the whole valve can leak inwards, a redundant plug barrier is lacked, and when the valve is closed under the condition of high-pressure in the well, an operator can feel extremely heavy by a wrench, the on-off control is difficult to be rapidly completed, especially, when the valve ball rotates, part of particles can be extruded into a tiny gap between the ball and the valve seat to form wedging effect, further increase the rotation resistance, and thus the control switching of the valve can not be completed in a short time. Disclosure of Invention The invention aims to provide a kelly bar plug valve for an offshore oilfield drill, which is characterized in that a plug liquid control structure is arranged in a cavity between a double-cavity valve body and an I-shaped upper end cover and an I-shaped lower end cover, the angle of the plug liquid control structure is detected in real time by an encoder to form an axial double-valve structure, when the two plug liquid control structures are controlled, an electric double-position synchronous driving structure controls the two plug liquid control structures to act simultaneously under the low-pressure well so as to enable an internal channel of a drill string to be closed, and a hydraulic rotary driving structure controls the plug liquid control structure to act under the high-pressure well under the supply of an external hydraulic pump station, so that the problems in the background technology are solved. In order to achieve the purpose, the invention provides the following technical scheme that the kelly plug valve for the offshore oilfield drilling comprises the following components: The double-cavity valve body is provided with an upper cavity and a lower cavity which are distributed at intervals along the axial direction, the two ends of the double-cavity valve body are respectively bolted with an I-shaped upper end cover and an I-sha