阅读说明：本技术 一种旋转防喷器用安全锁紧装置以及锁紧方法 (Safety locking device and locking method for rotary blowout preventer ) 是由 彭元超 谢新刚 李欣 胡东峰 陈小荣 杨赟 仵磊 王玉 韩朝辉 周雄兵 李晓黎 于 2020-08-25 设计创作，主要内容包括：本发明公开了一种旋转防喷器用安全锁紧装置以及锁紧方法,包括安全销栓、销栓卡座和自锁装置(5),所述安全销栓包括大耳螺母(1)和销栓螺杆(3),销栓卡座包括第一销栓卡座(2)和第二销栓卡座(4),所述第一销栓卡座(2)固定于旋转防喷器壳体卡箍顶部开口一侧,第二销栓卡座(4)固定于旋转防喷器壳体卡箍开口顶部另一侧,所述销栓螺杆(3)一端可转动固定于第二销栓卡座(4)上,销栓螺杆(3)另一端连接大耳螺母(1),其中大耳螺母(1)可锁紧在第一销栓卡座(2)上,所述自锁装置(5)固定于旋转防喷器壳体卡箍顶部并且自锁装置与第一销栓卡座设置于旋转防喷器壳体卡箍同侧开口处,其中自锁装置可卡在大耳螺母内。(The invention discloses a safety locking device and a locking method for a rotary blowout preventer, which comprise a safety pin bolt, a pin bolt clamping seat and a self-locking device (5), wherein the safety pin bolt comprises a big lug nut (1) and a pin bolt screw (3), the pin bolt clamping seat comprises a first pin bolt clamping seat (2) and a second pin bolt clamping seat (4), the first pin bolt clamping seat (2) is fixed at one side of an opening at the top of a hoop of a rotary blowout preventer shell, the second pin bolt clamping seat (4) is fixed at the other side of the opening at the top of the hoop of the rotary blowout preventer shell, one end of the pin bolt screw (3) is rotatably fixed on the second pin bolt clamping seat (4), the other end of the pin bolt screw (3) is connected with the big lug nut (1), the big lug nut (1) can be locked on the first pin bolt clamping seat (2), the self-locking device (5) is fixed at the top of the hoop of the rotary blowout preventer shell, and the self-locking device, wherein the self-locking device can be clamped in the big lug nut.)

1. The utility model provides a rotatory safety locking device for blowout preventer which characterized in that: the safety pin comprises a safety pin bolt, a pin bolt clamping seat and a self-locking device (5), wherein the safety pin bolt comprises a big lug nut (1) and a pin bolt screw (3), the pin bolt clamping seat comprises a first pin bolt clamping seat (2) and a second pin bolt clamping seat (4), the first pin bolt clamping seat (2) is fixed on one side of the top opening of a shell clamp of a rotary blowout preventer, the second pin bolt clamping seat (4) is fixed on the other side of the top opening of the shell clamp of the rotary blowout preventer, one end of the pin bolt screw (3) is rotatably fixed on the second pin bolt clamping seat (4), the other end of the pin bolt screw (3) is connected with the big lug nut (1), the big lug nut (1) can be locked on the first pin bolt clamping seat (2), the self-locking device (5) is fixed on the top of the shell clamp of the rotary blowout preventer, and the self-locking device (5) and the first pin bolt clamping, wherein the self-locking device (5) can be clamped in the big lug nut (1).

2. The safety locking device for a rotary blowout preventer according to claim 1, wherein: big ear nut (1) is including screw thread and ear type earrings, and wherein ear type earrings are connected respectively to screw thread terminal surface both sides, the screw thread inner wall is provided with the screw thread, and wherein screw thread and cotter screw rod (3) threaded connection.

3. The safety locking device for a rotary blowout preventer according to claim 2, wherein: one end of the pin bolt screw rod (3) is rotatably fixed on the second pin bolt clamping seat (4), wherein the surface of the other end of the pin bolt screw rod (3) is provided with threads, and the threads on the surface of the pin bolt screw rod (3) are matched with the threads on the inner wall of the screw thread of the big lug nut (1).

4. The safety locking device for a rotary blowout preventer according to claim 3, wherein: the second pin bolt clamping seat (4) is composed of a first component (4-1), a second component (4-2) and a third component (4-3), wherein the first component (4-1) and the second component (4-2) are arranged oppositely, two ends of the third component (4-3) are respectively welded with the end parts of the same side of the first component (4-1) and the second component (4-2), the third component (4-3) is welded on one side of an opening of the top of a hoop of a rotary blowout preventer shell, mounting holes are formed in the center positions of the first component (4-1) and the second component (4-2), one end of a pin bolt (3) is radially provided with the mounting hole, and the pin bolt (3) and the second pin bolt clamping seat (4) are connected through the mounting holes through bolts.

5. The safety locking device for a rotary blowout preventer according to claim 1, wherein: the first pin bolt clamping seat (2) consists of a fourth component (2-1), a fifth component (2-2) and a sixth component (2-3), wherein the fourth member (2-1) and the fifth member (2-2) are oppositely arranged, two ends of the sixth member (2-3) are respectively welded with the same side end parts of the fourth member (2-1) and the fifth member (2-2), the sixth member (2-3) is welded on the other side of the top opening of the hoop of the rotary blowout preventer shell, wherein the fourth component (2-1) and the fifth component (2-2) are both reverse ladder-shaped buckles with big top and small bottom, the distance between the fourth member (2-1) and the fifth member (2-2) is larger than the diameter of the bolt screw (3), wherein the bolt screw (3) can rotate around the second bolt clamping seat (4) and is clamped or opened at the first bolt clamping seat (2).

6. The safety locking device for a rotary blowout preventer according to claim 5, wherein: and chamfers are arranged between the top surface and the side surface of one side of the fourth component (2-1) and the fifth component (2-2) far away from the second pin bolt clamping seat (4), wherein the included angle between the straight line of the side surface of one side of the fourth component (2-1) and the fifth component (2-2) far away from the second pin bolt clamping seat (4) and the vertical line is 0-20 degrees.

7. The safety locking device for a rotary blowout preventer according to claim 1, wherein: the self-locking device (5) comprises an upper cover (5-1), a lock tongue (5-2) and a base body (5-3), wherein mounting holes are formed in the middle positions of the upper cover (5-1), the lock tongue (5-2) and the base body (5-3), internal threads are formed in the mounting holes of the upper cover (5-1) and the base body (5-3), the lock tongue (5-2) is mounted in the base body (5-3), the upper cover (5-1) is mounted on the upper end face of the lock tongue (5-2), the upper cover (5-1), the lock tongue (5-2) and the base body (5-3) are fixed through the mounting holes through bolts, the lock tongue (5-2) comprises a tongue body (5-2-1) and a tongue ring (5-2-2), and the tongue body ring (5-2-1) and the tongue ring (5-2-2) are arranged on the lock tongue (5-2), and the lock tongue ( -2) on the same side, the tongue body (5-2-1) is of a columnar structure, the tongue body ring (5-2-2) is of an annular structure, the seat body (5-3) is provided with a spring groove (5-3-1) at a position corresponding to the tongue body (5-2-1), wherein a spring is arranged in a space between the tongue body (5-2-1) and the spring groove (5-3-1), the tongue body (5-2-1) is in a pop-up state and clamped in the big-lug nut (1) in a normal state, and when the tongue body ring (5-2-2) is pulled outwards, the spring tongue body (5-2) can axially rotate around the self-locking device (5) to enable the tongue body (5-2-1) to withdraw from the big-lug nut (1).

8. The safety locking device for a rotary blow out preventer according to claim 7, wherein: one side of the tongue body (5-2-1) close to the big lug nut (1) is an inclined plane, wherein the extension size of the upper end of the inclined plane is smaller than that of the lower end of the inclined plane, and a chamfer is arranged at the contact position of the inclined plane and the upper end face of the tongue body (5-2-1).

9. The safety locking device for a rotary blowout preventer according to claim 1, wherein: the safety locking device further comprises an auxiliary assembly (6), wherein the auxiliary assembly (6) comprises an auxiliary rod (6-1) and an S-shaped auxiliary hook (6-2), the end part of the auxiliary rod (6-1) is connected with the middle part of the S-shaped auxiliary hook (6-2), the concave part of the S-shaped auxiliary hook (6-2) can be sleeved in the big lug nut (1) to push upwards to open the safety pin bolt, and the convex part of the S-shaped auxiliary hook (6-2) can be sleeved in the big lug nut (1) to pull downwards to close the safety pin bolt.

10. A locking method of a safety locking device for a rotary blowout preventer according to any one of claims 1 to 9, comprising the steps of:

step 1) installing a rotary blowout preventer at a wellhead, setting the working pressure of a hoop of a shell of the rotary blowout preventer to 11Mpa, closing the hoop, installing safety locking devices at two sides of an opening at the top of the hoop, manually adjusting the thread pitch of a big lug nut (1) after a safety bolt is closed, simultaneously clamping a self-locking device (5) in the big lug nut (1), and then adjusting the working pressure of the hoop to 10MPa to normally close the working pressure, so that the safety bolt is forced to pin tightly and cannot be released;

step 2) when the rotary assembly sealing rubber core of the rotary blowout preventer needs to be replaced, the closing pressure of the clamp is adjusted to be 11Mpa, the self-locking device (5) is withdrawn from the big lug nut (1), the safety pin is opened, the working pressure of the clamp is adjusted to be 1-2 Mpa, the clamp is opened, the rotary assembly is provided, the drilling tool is disassembled and buckled, the rotary assembly sealing rubber core is connected, the newly replaced rotary assembly sealing rubber core is placed into the shell, the working pressure of the clamp is adjusted to be 11Mpa, the clamp is closed, the safety pin is closed, meanwhile, the self-locking device (5) is clamped in the big lug nut (1), the working pressure of the clamp is adjusted to be 10MPa, and then normal drilling is carried out.

Technical Field

The invention belongs to the technical field of locking of rotary blowout preventers, and particularly relates to a safety locking device and a locking method for a rotary blowout preventer.

Background

In the existing 'three-low' oil reservoir, the original pressure of a reservoir is low, and the reservoir capacity needs to be improved through water injection, so that the aim of high-efficiency exploitation is fulfilled. The invention relates to a rotary blowout preventer system, which is used for effectively reducing well control risk and operation difficulty of drilling, and is a main drilling technology for oil field development in a high-pressure water injection area.

The rotary blowout preventer system is characterized in that the rotary blowout preventer system is a rotary blowout preventer and comprises a rotary assembly, a shell assembly, a hydraulic throttle valve and the like, the rotary assembly is provided with a sealing rubber core and can be used for sealing a drilling tool in a driven mode, the rotary assembly and the shell assembly are opened through a hoop and are placed into the shell assembly through a square tile hole, and meanwhile, a safety bolt is adopted to prevent tripping. The sealing rubber core of the rotary assembly is worn by pushing, pulling and rotating reciprocating motion with a drilling tool in drilling operation, the service life of the rubber core is limited, the rubber core fails after being torn and leaked, and the sealing rubber core of the rotary assembly needs to be replaced immediately, so that the safety bolt needs to be disassembled and the clamp needs to be opened/closed.

The operation is easily broke down in the long-term area of clamp pneumatic cylinder on the rotatory preventer casing, leads to the arm not hard up to open, causes the well head out of control, consequently needs the design to install cotter mechanical locking additional, nevertheless there is following problem in the in-service use of former design safety bolt:

firstly, an installer must carry tools such as a large monkey wrench, a safety bolt and the like, the installer is in ascending operation, the standing space is limited, the rotation angle of the bolt is too small, and the installation and disassembly procedures are complex and low in efficiency;

secondly, the safety risk of the installer is high, the installer needs to work at a high altitude, the standing space is limited, the installer can only operate with one hand, and the operator is easy to fall and fall;

thirdly, the safety bolts, operation tools and the like have well falling risks, so that underground complex accidents are caused;

fourthly, slurry is easy to block and corrode the screw hole of the safety bolt, so that the assembly and disassembly are difficult.

Therefore, it is necessary to develop a safe, simple and efficient mechanical locking device and locking method.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a safety locking device for a rotary blowout preventer and a locking method, and overcomes the defects that in the prior art, the locking device comprises the following components in parts by weight: the installer has to carry tools such as a large monkey wrench, a safety bolt and the like, the installer has the disadvantages of ascending operation, limited standing space, over-small bolt rotation angle, complex installation and disassembly procedures and low efficiency; 2: the safety risk of an installer is high, the installer needs to work at a high altitude, the standing space is limited, the installer can only operate with one hand, and the operator is easy to fall and fall; 3: the safety bolts, operation tools and the like have well falling risks, so that underground complex accidents are caused; 4: the slurry is easy to block, and the screw hole of the safety bolt is corroded to cause the problems of difficult assembly and disassembly and the like.

In order to solve the technical problem, the technical scheme of the invention is as follows: the utility model provides a rotatory safety locking device for blowout preventer, includes safety pin, cotter pin cassette and self-lock device, the safety pin includes big ear nut and cotter screw rod, and the cotter pin cassette includes first cotter pin cassette and second cotter pin cassette, first cotter pin cassette is fixed in rotatory blowout preventer casing clamp open-top one side, and second cotter pin cassette is fixed in rotatory blowout preventer casing clamp open-top opposite side, cotter screw rod one end is rotatable to be fixed in on the second cotter pin cassette, and big ear nut is connected to the cotter screw rod other end, and wherein big ear nut can lock on first cotter pin cassette, self-lock device is fixed in rotatory blowout preventer casing clamp top and self-lock device and first cotter pin cassette set up in rotatory blowout preventer casing clamp homonymy opening part, and wherein self-lock device can block in big ear nut.

Preferably, big ear nut includes screw thread and ear type earrings, and wherein ear type earrings are connected respectively to screw thread terminal surface both sides, the screw thread inner wall is provided with the screw thread, and wherein screw thread and cotter screw threaded connection.

Preferably, one end of the bolt screw is rotatably fixed on the second bolt clamping seat, wherein the surface of the other end of the bolt screw is provided with threads, and the threads on the surface of the bolt screw are matched with the threads on the inner wall of the screw thread of the big lug nut.

Preferably, the second pin bolt clamping seat is composed of a first member, a second member and a third member, wherein the first member and the second member are arranged oppositely, two ends of the third member are respectively welded with the end parts of the first member and the second member on the same side, the third member is welded on one side of an opening of the top of the hoop of the rotary blowout preventer shell, mounting holes are formed in the center positions of the first member and the second member, one end of the pin bolt is radially provided with the mounting hole, and the pin bolt and the second pin bolt clamping seat are connected through the mounting holes through bolts.

Preferably, the first pin bolt clamping seat is composed of a fourth component, a fifth component and a sixth component, wherein the fourth component and the fifth component are oppositely arranged, two ends of the sixth component are respectively welded with the same side end parts of the fourth component and the fifth component, the sixth component is welded on the other side of the opening of the top part of the clamping seat of the rotary blowout preventer shell, the fourth component and the fifth component are both inverted ladder-shaped buckles with large top parts and small bottom parts, the distance between the fourth component and the fifth component is larger than the diameter of the pin bolt, and the pin bolt can rotate around the second pin bolt clamping seat and is clamped or opened at the first pin bolt clamping seat.

Preferably, chamfers are arranged between the top surface and the side surface of the fourth member and the side surface of the fifth member, which are far away from the second pin bolt clamping seat, and an included angle between a straight line and a vertical line of the side surface of the fourth member and the side surface of the fifth member, which are far away from the second pin bolt clamping seat, is 0-20 degrees.

Preferably, the self-locking device comprises an upper cover, a lock tongue and a base body, wherein mounting holes are formed in the middle positions of the upper cover, the lock tongue and the base body, internal threads are formed in the mounting holes of the upper cover and the base body, the lock tongue is mounted in the base body, the upper cover is mounted on the upper end surface of the lock tongue, the upper cover, the lock tongue and the base body penetrate through the mounting holes through bolts to be fixed, the lock tongue comprises a tongue body and a tongue body ring, the tongue body and the tongue body ring are arranged on the same side of the lock tongue, the tongue body is of a columnar structure, the tongue body ring is of an annular structure, the base body is provided with a spring groove in a position corresponding to the tongue body, a spring is mounted in a space between the tongue body and the spring groove, the tongue body is in a popup state and clamped in a big-ear nut in a normal state, and when the.

Preferably, one side of the tongue body close to the big lug nut is an inclined plane, wherein the extension size of the upper end of the inclined plane is smaller than that of the lower end of the inclined plane, and a chamfer is arranged at the contact position of the inclined plane and the upper end face of the tongue body.

Preferably, the safety locking device further comprises an auxiliary assembly, wherein the auxiliary assembly comprises an auxiliary rod and an S-shaped auxiliary hook, the end of the auxiliary rod is connected with the middle part of the S-shaped auxiliary hook, the concave part of the S-shaped auxiliary hook can be sleeved in the big lug nut to push upwards to open the safety pin, and the convex part of the S-shaped auxiliary hook can be sleeved in the big lug nut to pull downwards to close the safety pin.

Preferably, a locking method of the safety locking device for the rotary blowout preventer, which is described in any one of the above, comprises the following steps:

step 1) installing a rotary blowout preventer at a wellhead, setting the working pressure of a hoop of a shell of the rotary blowout preventer to 11Mpa, closing the hoop, installing safety locking devices at two sides of an opening at the top of the hoop, manually adjusting the thread pitch of a big-lug nut after a safety bolt is closed, simultaneously clamping a self-locking device in the big-lug nut, and then adjusting the working pressure of the hoop to 10MPa to normally close the working pressure, so that the safety bolt is forced to pin tightly and cannot be released;

and 2) when the rotary assembly sealing rubber core of the rotary blowout preventer needs to be replaced, adjusting the closing pressure of the clamp to 11Mpa, withdrawing the self-locking device from the big lug nut, opening the safety bolt, adjusting the working pressure of the clamp to 1-2 Mpa, opening the clamp, providing the rotary assembly, disassembling the drilling tool buckle, connecting the rotary assembly sealing rubber core, putting the newly replaced rotary assembly sealing rubber core into the shell, adjusting the working pressure of the clamp to 11Mpa, closing the clamp, closing the safety bolt, clamping the self-locking device in the big lug nut, adjusting the working pressure of the clamp to 10MPa, and then normally drilling.

Compared with the prior art, the invention has the advantages that:

(1) the safety locking device comprises a safety pin bolt, a pin bolt clamping seat, a self-locking device and an auxiliary assembly, wherein the pin bolt clamping seat is fixed at two sides of an opening at the top of a hoop of a shell of the blowout preventer, one end of the safety pin bolt is fixed on the pin bolt clamping seat at one side, the other end of the safety pin bolt is clamped on the pin bolt clamping seat at the other side, wherein the safety pin bolt is opened and clamped by matching with the auxiliary component, an operator can stand on the ground to use the auxiliary component to complete the opening/closing work, the operator is prevented from working at high altitude and limited space, the working safety and the working efficiency are improved, and the opening and the clamping of the safety pin are simple and flexible, so that the installation and the disassembly of the rotary blowout preventer component are convenient, in addition, each component of the safety locking device is integrated after being installed, the risk of falling into a well cannot exist, and the clamping space of the pin bolt clamping seat is large and is not influenced by slurry blockage;

(2) the first pin bolt clamping seat is designed into an inverted ladder shape with large upper part and small lower part and gradient, the safety pin bolt can be prevented from tripping, when the work pressure of the clamp is closed at 11Mpa, an auxiliary assembly can be adopted to clamp a big lug nut in the first pin bolt clamping seat on the ground to perform the operation of closing the safety pin bolt, after the closing operation is completed, the work pressure of the clamp can be adjusted to be 10MPa, the normal closing work pressure is normal, and at the moment, the safety pin bolt is forced to be fastened without tripping, so that the safety reliability is improved;

(3) one end of the safety pin bolt can rotate for switching operation, and the other end of the safety pin bolt is designed into threads and can be manually screwed by a big lug nut to prevent loosening, so that an auxiliary assembly is convenient to use for switching operation, and meanwhile, the safety bolt can be prevented from falling off in the assembling and disassembling process, and well falling accidents are avoided;

(4) the self-locking device can prevent the thread of the safety pin bolt from being unscrewed, prevent the safety pin bolt from jumping off, ensure that the safety pin bolt still works normally when the accidental conditions such as vibration, hydraulic circuits and the like occur, improve the safety performance of the integral part, automatically pin the big lug nut by the tongue body when the safety pin bolt is closed, and need to stir the tongue body ring outwards when the safety pin bolt is opened and simultaneously open the safety pin bolt upwards.

Drawings

FIG. 1 is a schematic structural view of a safety locking device for a rotary blowout preventer according to the present invention;

FIG. 2 is a schematic view of a safety pin and a pin holder opening structure of a safety locking device for a rotary blowout preventer according to the present invention;

FIG. 3 is a schematic view of a safety pin and a pin block clamping structure of the safety locking device for a rotary blowout preventer according to the present invention;

FIG. 4 is a schematic structural view of a self-locking device of a safety locking device for a rotary blowout preventer according to the present invention;

FIG. 5 is a schematic structural view of an upper cover of a self-locking device of the safety locking device for the rotary blowout preventer, according to the present invention;

FIG. 6 is a schematic diagram of a self-locking device bolt structure of a safety locking device for a rotary blowout preventer according to the present invention;

FIG. 7 is a schematic structural view of a self-locking device seat body of a safety locking device for a rotary blowout preventer according to the present invention;

FIG. 8 is a schematic view of a snap-fit structure of a lug nut and a self-locking device of the safety locking device for the rotary blowout preventer according to the present invention;

fig. 9 is a schematic structural view of an auxiliary assembly of the safety locking device for the rotary blowout preventer according to the present invention.

Description of the reference numerals

1. The self-locking device comprises a big lug nut, a first pin bolt clamping seat, a pin bolt screw, a second pin bolt clamping seat, a self-locking device and an auxiliary assembly, wherein the big lug nut is 2;

2-1, a fourth member, 2-2, a fifth member, 2-3, a sixth member;

4-1, a first member, 4-2, a second member, 4-3, a third member;

5-1, an upper cover, 5-2, a bolt, 5-3 and a seat body;

5-2-1, tongue body, 5-2-2 and tongue body ring;

5-3-1, spring groove;

6-1, an auxiliary rod, 6-2 and an S-shaped auxiliary hook.

Detailed Description

The following describes embodiments of the present invention with reference to examples:

it should be noted that the structures, proportions, sizes, and other elements shown in the specification are included for the purpose of understanding and reading only, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.