CN213087949U - Blowout prevention nipple and Christmas tree - Google Patents

Abstract

The utility model relates to a prevent spouting nipple joint and production tree, wherein, prevent spouting the nipple joint and include that bivalve polished rod protects a section of thick bamboo, bivalve seal box and bivalve polished rod down and protect a section of thick bamboo. The upper bivalve polish rod protective cylinder, the bivalve sealing box protective cylinder and the lower bivalve polish rod protective cylinder are sequentially fixed by screw threads from top to bottom, and the upper bivalve polish rod protective cylinder, the bivalve sealing box protective cylinder and the lower bivalve polish rod protective cylinder are formed by butting two semicircular protective cylinders. The outer wall of the lower bivalve polished rod protective cylinder is fixed with a bivalve hoop head through threads, and the bivalve hoop head is formed by butt joint of two semicircular hoop heads. The bottom surface of the lower bivalve polished rod casing is provided with a central hole, the side wall of the lower bivalve polished rod casing and the upper part of the bivalve clamp head are provided with grease injection holes, and the side wall of the top of the upper bivalve polished rod casing is provided with exhaust holes. The utility model discloses need not utilize the crane operation when installing and dismantling and prevent spouting the nipple joint, the dismouting work load and the intensity of labour that have significantly reduced to the security in the operation process has been improved.

Description

Blowout prevention nipple and Christmas tree

Technical Field

The utility model relates to a steam scurries well and prevents spouting technical field, especially relates to a prevent spouting nipple joint and production tree, mainly is applicable to the operation of preventing spouting of well to steam scurries in the oil well production process.

Background

The production tree is a wellhead device for producing petroleum, such as a self-blowing well, a mechanical production well and the like, and is a main device for controlling and regulating oil and gas production at the uppermost part of an oil and gas well. As shown in fig. 1 and 2, the christmas tree 01 has an oil flow channel penetrating in a vertical direction, an oil well clamp head 011 (an annular clamp head of a whole circle) is fixed at a top opening of the oil flow channel by threads, a polish rod 012 is inserted in the oil flow channel in a vertically sliding manner, the upper end of the polish rod 012 extends out of the oil well clamp head 011, a polish rod sealing box 013 and a sealing box clamp head 014 are sleeved on the polish rod 012 extending out of the oil well clamp head 011 part, and the lower end of the polish rod 012 is connected with the polish rod when in use. The upper end of the seal box clamp head 014 is fixed with the lower end of the polish rod seal box 013 through threads, an oil well seal steel ring 015 is clamped between the lower end of the seal box clamp head 014 and the upper end of the oil well clamp head 011, and the seal box clamp head 014 and the oil well clamp head 011 are locked and fixed through an oil well slip 016 (the oil well slip 016 is composed of two semi-arc slips and is locked and fixed through bolts).

Wherein, install annular one-level packing in the hexagonal seal lid 0131 at top in the polish rod seal box 013, realize with the contact seal of polish rod 012, liquid leakage when avoiding polish rod 012 to slide from top to bottom in the oil recovery process. Meanwhile, the packing flank boxes 0132 are fixed on two sides of the polish rod sealing box 013 through threads, a screw and a semicircular second-level packing are arranged in the packing flank boxes 0132, and the second-level packing on two sides is not in contact with the polish rod 012 and is in a separated state during normal oil extraction. Because the polished rod 012 can cause certain wearing and tearing to one-level packing when sliding from top to bottom, wearing and tearing need change one-level packing after to a certain degree. When the oil well is replaced, the oil well is required to stop production, and then the screw rods in the packing flank boxes 0132 on the two sides are screwed to enable the secondary packing on the two sides to be tightly leaned on the polish rod 012, so that the temporary sealing effect between the polish rod 012 and the inner wall of the polish rod sealing box 013 can be realized, and the pressure of the oil well does not need to be removed when the primary packing is replaced; meanwhile, the two-stage packing on the two sides can also play a centering role on the polish rod 012 after the polish rod 012 is sealed, so that the polish rod 012 is prevented from being inclined, and the new one-stage packing is convenient to install.

However, in the oil production process, heavy oil and ultra heavy oil need to be subjected to steam stimulation production, and inter-well steam channeling frequently occurs as the oil field production time extends. After one oil well injects steam, the peripheral oil wells communicated with the oil well have steam channeling phenomenon. Because the pressure is higher during the steam channeling, on one hand, the polish rod 012 can ascend; on the other hand, because the first-stage packing is arranged between the polish rod 012 and the polish rod sealing box 013 for sealing, the pressure born by the first-stage packing is smaller; simultaneously the pressure that the second grade packing of both sides can bear is also less, and packing flank box 0132 and polished rod seal box 013 be threaded connection, the pressure that this threaded connection department can bear is also less, consequently, when steam scurries, this pressure can not be born to one-level packing, second grade packing and packing flank box 0132 and polished rod seal box 013's threaded connection department, steam will follow in the gap between polished rod 012 and the one-level packing and the junction of packing flank box 0132 and polished rod seal box 013 scurries out, there is the safety risk. Therefore, in order to ensure the construction safety, the steam channeling oil well needs to be stopped to perform blowout prevention operation, and after the gas injection of the adjacent well is finished, the oil extraction operation of the oil well is continued.

The conventional blowout prevention operation adopts installation of a blowout prevention pipe, as shown in fig. 3, the blowout prevention pipe 02 is a 2-inch half oil pipe 3-5 m long, because a polish rod sealing box 013 cannot be directly and fixedly connected with the blowout prevention pipe 02, and the connection between the polish rod sealing box 013 and a sealing box clamp head 014 is relatively complex to disassemble, an oil pipe male buckle is generally processed at the lower end of the blowout prevention pipe 02, a lower clamp head 021 (a whole ring of annular clamp head) is connected at the lower end of the blowout prevention pipe 02 so as to be connected with an oil well clamp head 011, and a screw plug 022 is fixed at the upper end of the blowout prevention pipe. The operation process is that after the oil well is stopped pumping, the polish rod sealing box 013 and the sealing box clamp head 014 are separated from the top of the polish rod 012 by a crane, and then the tubular lubricator 02 with the length of 3-4 meters is lifted by the crane and sleeved on the outer side of the polish rod 012. And then, the lower clamp head 021 at the lower end of the blowout prevention pipe 02 and the oil well clamp head 011 on the Christmas tree 01 are locked and fixed in a sealing mode through the oil well slips 016 and the oil well sealing steel ring 015, and the installation blowout prevention operation of the blowout prevention pipe 02 is completed.

However, when the blowout prevention pipe 02 is used for realizing blowout prevention, a crane is required to be used for operation, the operation is very complicated, potential safety hazards exist, and the following defects mainly exist:

1. the top end of the polish rod 012 is 3-5 m away from the ground, and the length of the blowout prevention pipe 02 is 3-5 m, so that the top end of the blowout prevention pipe 02 needs to be lifted by a crane to a height of at least 6m away from the ground, and when the crane is operated, the lifting hook and the horse head of the oil pumping unit may collide, and the safety is poor;

2. when the lubricator 02 is installed, after the lubricator 02 is lifted, an operator needs to pull the lubricator 02 by using a traction rope so that the orifice of the lubricator 02 is opposite to the polish rod 012; however, for the sake of safety, an operator cannot directly approach the installation position, the operation position of the pulling rope is relatively far from the installation position, and meanwhile, because the polish rod 012 has no supporting component, the polish rod 012 is deflected due to the wind speed of a construction site and the like, so that the alignment operation of the lubricator 02 and the polish rod 012 is relatively difficult, and the risk is high during the operation;

3. after the gas injection of the adjacent well is finished, the oil extraction operation of the oil well needs to be continued, so that the lubricator 02 needs to be dismantled and reinstalled with the polish rod sealing box 013 and the sealing box clamp head 014, the crane operation still needs to be carried out in the dismantling process of the lubricator 02, and the polish rod sealing box 013 and the sealing box clamp head 014 need to be hoisted by the crane when reinstalled, and an operator needs to align the central hole of the sealing box clamp head 014 with the polish rod 012 by using a hauling rope, however, the difference between the diameter of the central hole of the sealing box clamp head 014 and the diameter of the polish rod 012 is very small, the diameter of the central hole of the general sealing box clamp head 014 is 30cm, the diameter of the polish rod 012 is 25cm, the difference between the diameter of the polish rod 012 and the polish rod 012 is only 5cm, and the alignment operation of the polish rod and the polish rod is very difficult by using the hauling;

4. the blowout prevention pipe 02 is installed or disassembled once, 6-8 operators are needed, and the safety management difficulty is high;

5. in a construction site, the crane needs to report application in advance, the time is needed when the crane is reported, blowout prevention operation cannot be performed in time, the time is limited, and the working efficiency is influenced.

Therefore, the inventor provides the blowout prevention nipple and the Christmas tree by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prevent spouting nipple joint and production tree need not utilize crane operation when installing and dismantling prevent spouting the nipple joint, the dismouting work load and the intensity of labour that have significantly reduced to the security in the operation process has been improved.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides a blowout prevention nipple joint, which comprises an upper bivalve polish rod protective cylinder with an upper end closed and a lower end opened, a bivalve sealing box protective cylinder with two ends opened and a lower bivalve polish rod protective cylinder with an upper end opened and a lower end closed; the upper bivalve polish rod protective cylinder, the bivalve sealing box protective cylinder and the lower bivalve polish rod protective cylinder are sequentially fixed by screw threads from top to bottom, and the upper bivalve polish rod protective cylinder, the bivalve sealing box protective cylinder and the lower bivalve polish rod protective cylinder are formed by butting two semicircular protective cylinders; the outer wall of the lower bivalve polished rod protective cylinder is fixed with a bivalve hoop head through threads, and the bivalve hoop head is formed by butt joint of two semicircular hoop heads; the bottom surface of the lower bivalve polished rod casing is provided with a central hole, the side wall of the lower bivalve polished rod casing and the upper part of the bivalve clamp head are provided with grease injection holes, and the side wall of the top of the upper bivalve polished rod casing is provided with exhaust holes.

In a preferred embodiment of the present invention, the inner diameter of the bivalve polish rod protecting cylinder is larger than the inner diameter of the upper bivalve polish rod protecting cylinder and the inner diameter of the lower bivalve polish rod protecting cylinder, the upper part of the bivalve polish rod protecting cylinder extends upward to form an upper bivalve tube body with a reduced inner diameter, and the lower part of the bivalve polish rod protecting cylinder extends downward to form a lower bivalve tube body with a reduced inner diameter; the outer wall of the lower end of the upper bivalve polished rod protective cylinder is in threaded connection with the inner wall of the upper bivalve tube body, and the inner wall of the lower bivalve tube body is in threaded connection with the outer wall of the upper end of the lower bivalve polished rod protective cylinder.

The utility model discloses an in a preferred embodiment, the below card that just is located the exhaust hole in the outside of last bivalve polished rod casing is established and is fixed with a bivalve chuck, and the outside card of last bivalve body is established and is fixed with last bivalve chuck, and the outside card of bivalve body is established and is fixed with lower bivalve chuck down.

In a preferred embodiment of the present invention, the top bivalve chuck, the upper bivalve chuck and the lower bivalve chuck are respectively provided with a top mounting hole, an upper mounting hole and a lower mounting hole at the center thereof, and the shapes of the top mounting hole, the upper mounting hole and the lower mounting hole are respectively matched with the outer wall shapes of the upper bivalve polish rod protective cylinder, the upper bivalve tube body and the lower bivalve tube body; the top bivalve chuck, the upper bivalve chuck and the lower bivalve chuck are formed by butt joint of two split chucks, and the two split chucks are fixedly connected through bolts.

In a preferred embodiment of the present invention, at least two upper annular bivalve locking grooves are formed in the outer wall of the upper bivalve tube body along the axial spacing ring thereof, at least two upper bivalve locking snap rings are formed in the hole wall of the upper mounting hole along the axial spacing ring thereof, the number of the upper bivalve locking snap rings is the same as that of the upper annular bivalve locking grooves, and the upper bivalve locking snap rings can be snapped in the corresponding upper annular bivalve locking grooves; the outer wall of bivalve body is equipped with two at least annular bivalve locked grooves down along its axial spacer ring down, and the pore wall of mounting hole is equipped with two at least bivalve lock snap rings down along its axial spacer ring down, and the quantity of bivalve lock snap ring is the same with the quantity of annular bivalve locked groove down, and lower bivalve lock snap ring can block to be established in the annular bivalve locked groove down that corresponds.

The utility model discloses an among the preferred embodiment, the outer wall of protecting a section of thick bamboo at last bivalve polished rod is equipped with two at least top annular bivalve locked grooves along its axial spacer ring, is equipped with two at least top bivalve lock snap rings along its axial spacer ring at the pore wall of top mounting hole, and the quantity of top bivalve lock snap ring is the same with the quantity of top annular bivalve locked groove, and top bivalve lock snap ring can block to establish in the top annular bivalve locked groove that corresponds.

The utility model discloses an in a preferred embodiment, the inner wall of protecting a section of thick bamboo at last bivalve polished rod and the inner wall of protecting a section of thick bamboo at bivalve polished rod down are equipped with many and go up bivalve zigzag inverted tooth ring and many bivalve zigzag inverted tooth ring down along its axial difference spacer ring.

The utility model discloses an among the preferred embodiment, a bivalve polished rod protects a section of thick bamboo and a third bivalve reducing protects a section of thick bamboo including protecting a section of thick bamboo from the first bivalve reducing that supreme external diameter increases in proper order down, the bivalve reducing protects a section of thick bamboo and a third bivalve reducing, and bivalve collar head and second bivalve reducing protect a thread tightening, and the upper end and the bivalve seal box of a third bivalve reducing protect a lower extreme thread tightening of a section of thick bamboo.

In a preferred embodiment of the present invention, the two wing tubes are symmetrically disposed and protrude outward from the side wall of the dual-petal sealing box casing, the axial direction of the wing tubes extends along the radial direction of the dual-petal sealing box casing, and the wing tubes are communicated with the inside of the dual-petal sealing box casing.

The utility model also provides a production tree, the production tree has the oil stream passageway that the vertical direction link up, be fixed with oil well clamp head in the top mouth department of oil stream passageway, the internal energy is inserted with the polished rod with sliding from top to bottom in the oil stream passageway, the oil well clamp head is stretched out to the upper end of polished rod, and the cover is equipped with polished rod seal box and seal box clamp head on the polished rod that stretches out oil well clamp head part, the upper end of seal box clamp head is fixed with the lower extreme of polished rod seal box, the outside cover of polished rod is equipped with above-mentioned prevent spouting the nipple joint, the upper end of polished rod is located two lamella polish rod casing, polished rod seal box and seal box clamp head inlay and establish in two lamella seal box casing, the lower extreme of polished rod is worn out by the centre bore; an oil well sealing steel ring is clamped between the lower end of the bivalve clamp head and the upper end of the oil well clamp head, and the bivalve clamp head and the oil well clamp head are locked and fixed through an oil well slip; an annular grease injection space is formed between the inner wall of the upper bivalve polish rod protecting cylinder, the inner wall of the bivalve sealing box protecting cylinder, the inner wall of the lower bivalve polish rod protecting cylinder, the outer wall of the polish rod sealing box and the outer wall of the sealing box clamp head.

The utility model discloses an among the preferred embodiment, prevent spouting the nipple joint and still include bivalve card layer board and bivalve card layer board down, go up bivalve card layer board card and establish the top position of fixing on the outer wall of polished rod and being located the polished rod seal box, bivalve card holds in the palm the board and establishes the bottom position of fixing on the outer wall of polished rod and being located the seal box chuck head down.

The utility model discloses an among the preferred embodiment, go up bivalve card layer board and the center of bivalve card layer board down and all seted up the through-hole, the shape of through-hole and the shape phase-match of polished rod, go up bivalve card layer board and bivalve card layer board down and constitute by two split card layer board butt joints, and two split card layer boards pass through bolt fixed connection.

From the above, the blowout prevention nipple in the utility model, because the upper bivalve polish rod protecting cylinder, the bivalve sealing box protecting cylinder, the lower bivalve polish rod protecting cylinder and the bivalve clamp head are bivalve split structures, split assembly and disassembly can be realized, the upper bivalve polish rod protecting cylinder, the lower bivalve polish rod protecting cylinder and the bivalve clamp head are not required to be lifted by a crane and then sleeved on the polish rod, and the polish rod sealing box and the sealing box clamp head are not required to be separated from the polish rod during installation, thereby avoiding the situations of inconvenient operation, poor safety, difficult alignment and the like caused by crane operation, greatly reducing the workload of installing the blowout prevention nipple, reducing the labor intensity and improving the working efficiency; simultaneously, can pour into cured resin and curing agent into to the inside of preventing spouting the nipple joint through annotating the fat hole, utilize cured resin can play the effect of circumferential seal to polished rod and polished rod seal box for whole prevent spouting between nipple joint and polished rod, polished rod seal box and the seal box clamp head by whole fixed together, treat that the oil well takes place the steam and scurries the back, also can guarantee that polished rod, polished rod seal box and seal box clamp head can not scurried, played effectual effect of preventing spouting.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: is a schematic structural diagram of the Christmas tree without the lubricator in the prior art.

FIG. 2: the structure schematic diagram of the oil well clamp head, the seal box clamp head, the oil well seal steel ring and the oil well slip in the prior art is shown.

FIG. 3: schematic structural diagram for installing lubricator for Christmas tree in prior art

FIG. 4: for the utility model provides a prevent spouting nipple joint's schematic structure drawing one.

FIG. 5: do the utility model provides a prevent spouting the schematic diagram two of nipple joint.

FIG. 6: for the utility model provides a christmas tree does not install the schematic diagram of preventing spouting the nipple joint.

FIG. 7: do the utility model provides a structure schematic diagram behind bivalve card layer board, lower bivalve card layer board and bivalve clamp head is installed to the production tree on the polished rod. Of these, the christmas tree in fig. 1, 6 and 7 is only partially illustrated.

FIG. 8: do the utility model discloses in the oil well clamp head that provides, bivalve clamp head, the sealed steel ring of oil well and oil well slips complex schematic structure.

FIG. 9: for the utility model provides a prevent spouting nipple joint and install the schematic structure outside the polished rod.

FIG. 10: for the utility model discloses in one of them semi-circular hoop head's of bivalve hoop head that provides structural schematic.

FIG. 11: does the utility model provides a lower bivalve polished rod protects a structural sketch map of one of them semicircle of a section of thick bamboo.

FIG. 12: does the utility model discloses in one of them semicircle of a bivalve seal box protecting section of thick bamboo that provides protect a schematic structure drawing.

FIG. 13: for the utility model discloses in the local enlargements of the last bivalve body that provide.

FIG. 14: does the utility model provides a lower bivalve polished rod protects a structural sketch map of one of them semicircle of a section of thick bamboo.

FIG. 15: to the structure schematic diagram of one of the split chucks in the upper bivalve chuck provided in the utility model.

FIG. 16: do the utility model discloses in the structural schematic diagram of the last bivalve card layer board that provides.

The reference numbers illustrate:

the prior art is as follows:

01. a Christmas tree; 011. an oil well collar head; 012. a polish rod; 013. a polish rod sealing box; 0131. a hexagonal sealing box cover; 0132. a packing box; 014. a seal box clamp head; 015. a sealing steel ring of the oil well; 016. oil well slips;

02. a lubricator; 021. a lower clamp head; 022. and (5) plugging with a thread.

The utility model discloses:

10. a blowout prevention short joint;

11. an upper bivalve polish rod protective cylinder; 111. an exhaust hole; 112. a top annular bivalve locking groove; 113. an upper bivalve sawtooth-shaped inverted gear ring;

12. a bivalve sealing box protecting cylinder; 121. an upper bivalve body; 1211. an upper annular bivalve lock slot; 122. a lower bivalve body; 1221. a lower annular bivalve locking groove; 123. a wing cylinder;

13. a lower bivalve polish rod protective cylinder; 131. a central bore; 132. a lower bivalve sawtooth-shaped inverted gear ring; 133. a first double-petal reducing protective sleeve; 134. a second double-petal reducing protective sleeve; 135. a third bivalve reducing protecting cylinder;

14. a bivalve clamp head; 141. a grease injection hole;

15. a top bivalve cartridge;

16. an upper bivalve cartridge; 161. an upper bivalve lock snap ring;

17. a lower bivalve cartridge;

18. an upper bivalve card support plate;

19. a lower bivalve card support plate;

20. a Christmas tree;

21. an oil well collar head;

22. a polish rod;

23. a polish rod sealing box;

24. a seal box clamp head;

25. a sealing steel ring of the oil well; 251. an upper convex ring;

26. oil well slips.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 4 to 16, the present embodiment provides a blowout preventing nipple 10, which includes an upper bivalve polish rod casing 11 with an upper end closed and a lower end opened, a bivalve sealing box casing 12 with two ends opened, and a lower bivalve polish rod casing 13 with an upper end opened and a lower end closed. The upper bivalve polish rod protective cylinder 11, the bivalve sealing box protective cylinder 12 and the lower bivalve polish rod protective cylinder 13 are sequentially fixed by screw threads from top to bottom, and the upper bivalve polish rod protective cylinder 11, the bivalve sealing box protective cylinder 12 and the lower bivalve polish rod protective cylinder 13 are formed by butt joint of two semicircular protective cylinders. A bivalve clamp head 14 is fixed on the outer wall of the lower bivalve polished rod casing 13 through threads, and the bivalve clamp head 14 is formed by butt joint of two semicircular clamp heads. The bottom surface of the lower bivalve polish rod guard barrel 13 is provided with a central hole 131, the side wall of the lower bivalve polish rod guard barrel 13 and the upper part of the bivalve clamp head 14 are provided with grease injection holes 141, and the side wall of the top part of the upper bivalve polish rod guard barrel 11 is provided with exhaust holes 111.

Specifically, when the oil well normally recovers oil, the blowout prevention nipple 10 does not need to be installed on the christmas tree 20, at this time, the seal box clamp head 24 and the oil well clamp head 21 on the christmas tree 20 are sealed and fixed through the oil well slip 26 and the oil well seal steel ring 25, and the structure after connection is as shown in fig. 6. When the blowout prevention operation is performed on the steam channeling well, the blowout prevention nipple 10 needs to be installed on a Christmas tree 20 of the steam channeling well, and the specific installation steps are as follows:

firstly, stopping pumping the oil well, removing oil well slips 26 to separate a seal box clamp head 24 from an oil well clamp head 21, and lifting a polish rod seal box 23 and the seal box clamp head 24 to a preset position of a polish rod 22; then the two semicircular clamping heads of the double-piece clamping head 14 are connected and closed above the oil well sealing steel ring 25, the double-piece clamping head 14 and the oil well clamping head 21 are locked and fixed by using the oil well slips 26, and the structure after the first step of installation is shown in fig. 7 and 8.

And secondly, sleeving the two semicircular protective barrels of the lower bivalve polished rod protective barrel 13 on the outer side of the polished rod 22 below the polished rod sealing box 23, inserting the lower parts of the two semicircular protective barrels into the inside of the bivalve clamp head 14 and the oil well sealing steel ring 25 and penetrating out from the bottom of the oil well clamp head 21, aligning the two semicircular protective barrels of the lower bivalve polished rod protective barrel 13, and screwing the lower bivalve polished rod protective barrel 13 to fix the lower bivalve polished rod protective barrel 13 and the bivalve clamp head 14 in a threaded manner.

And thirdly, correspondingly sleeving the two semicircular protective barrels of the bivalve sealing box protective barrel 12 on the outer sides of the polish rod sealing box 23 and the sealing box clamping head 24, aligning the two semicircular protective barrels of the bivalve sealing box protective barrel 12, and screwing the bivalve sealing box protective barrel 12 to fix the lower end of the bivalve sealing box protective barrel 12 and the upper end of the lower bivalve polish rod protective barrel 13 in a threaded manner.

And fourthly, sleeving the two semicircular protective barrels of the upper bivalve polished rod protective barrel 11 on the outer side of the polished rod 22 above the polished rod sealing box 23, aligning the two semicircular protective barrels of the upper bivalve polished rod protective barrel 11, and screwing the upper bivalve polished rod protective barrel 11 to enable the lower end of the upper bivalve polished rod protective barrel 11 to be fixed with the upper end of the bivalve sealing box protective barrel 12 in a threaded mode. At this time, annular grease injection spaces are formed between the inner wall of the upper bivalve polish rod protection barrel 11, the inner wall of the bivalve sealing box protection barrel 12, the inner wall of the lower bivalve polish rod protection barrel 13, the outer wall of the polish rod 22, the outer wall of the polish rod sealing box 23 and the outer wall of the sealing box clamp head 24, and the structure after the fourth step of installation is as shown in fig. 9.

Fifthly, alternately injecting the curing resin and the curing agent into the annular grease injection space from the grease injection hole 141 by using a rubber injection gun, and installing a plug at the exhaust hole 111 for plugging when the curing resin and the curing agent flow out from the exhaust hole 111; and then, continuously injecting the curing resin and the curing agent from the grease injection hole 141 alternately, completing resin injection when the injection pressure reaches 0.5-0.8 MPa (0.8 MPa is adopted in the embodiment), stabilizing for 10-15 min, curing the curing resin, and completing the installation operation of the whole blowout prevention pup joint 10 after the curing resin is cured.

Because the cured resin has a certain degree of shrinkage after curing compared with that before curing, the pressure of 0.5-0.8 MPa needs to be injected when the resin is injected, and the whole annular grease injection space can still be filled after the cured resin is cured and shrunk. The curing resin may be epoxy resin, or other curable resins may be used as needed, and the curing agent is prior art and will not be described herein again. The diameter of the central hole 131 is the same as that of the polish rod 22, the two are in clearance fit, the clearance is small, and the bottom surface of the lower bivalve polish rod protective cylinder 13 can prevent the downward outflow during the resin injection. Of course, a packing may be added between the wall of the central bore 131 and the polished rod 22 to provide a sealing function, if desired.

After the installation is finished, due to the curing action of the curing resin, the whole blowout prevention nipple 10, the polish rod 22, the polish rod sealing box 23 and the sealing box clamping head 24 are integrally fixed together, so that the integral fixing function and the sealing function are achieved. After the oil well has the steam channeling, the bottom pressure rises, the pressure is transmitted to the well head through the gap between the polish rod 22 and the topmost oil pipe in the oil well, then the pressure acts on the bottom surface of the lower bivalve polish rod casing 13 through the gap between the polish rod 22 and the oil flow channel, because the outer wall of the lower bivalve polish rod casing 13 is in threaded connection with the bivalve clamp head 14, the bivalve clamp head 14 is locked and fixed with the oil well clamp head 21 through the oil well clamp 26, and the oil well clamp head 21 is in threaded connection (namely is fixedly connected with the well head) with the top opening of the oil flow channel of the Christmas tree 20, therefore, the bivalve clamp head 14, the bivalve seal box casing 12, the lower bivalve polish rod casing 13 and other components can not be blown upwards.

After the gas injection of the adjacent well is finished, the blowout prevention short section 10 needs to be dismantled, the oil well continues to be subjected to oil extraction operation after the dismantling, and the dismantling of the blowout prevention short section 10 comprises the following steps: the upper bivalve polish rod protective cylinder 11 and the bivalve sealing box protective cylinder 12 are sequentially taken down, cured resin is exposed, and the cured resin is removed; then the oil well slip 26 is disassembled, the bivalve hoop head 14 is taken down, the lower bivalve polish rod casing 13 is taken out, and part of cured resin is taken out; and finally, the polish rod sealing box 23 and the sealing box hoop head 24 are installed back to the wellhead according to the structure shown in the figure 6, so that the disassembly of the blowout prevention nipple 10 and the restoration work of the wellhead can be completed.

Therefore, in the blowout prevention pup joint 10 in the embodiment, the upper bivalve polish rod casing 11, the bivalve sealing box casing 12, the lower bivalve polish rod casing 13 and the bivalve clamp head 14 are all bivalve split structures, split assembly and disassembly can be realized, the polish rod sealing box 23 and the sealing box clamp head 24 do not need to be lifted by a crane and then sleeved on the polish rod 22, and the polish rod sealing box 23 and the sealing box clamp head 24 do not need to be separated from the polish rod 22 during installation, so that the situations of inconvenient operation, poor safety, difficult alignment and the like caused by crane operation are avoided, the workload for installing the blowout prevention pup joint 10 is greatly reduced, the labor intensity is reduced, and the working efficiency is improved; meanwhile, the solidified resin and the solidified agent can be injected into the anti-blowout short section 10 through the grease injection hole 141, the solidified resin can be used for playing a role in circumferential sealing on the polish rod 22 and the polish rod sealing box 23, so that the whole anti-blowout short section 10, the polish rod 22, the polish rod sealing box 23 and the sealing box clamp head 24 are integrally fixed together, after the oil well generates steam channeling, the polish rod 22, the polish rod sealing box 23 and the sealing box clamp head 24 can not be upward fleed, and an effective anti-blowout effect is achieved.

In a specific implementation manner, for convenience of processing and installation, the inner diameter of the bivalve sealing box protective cylinder 12 is larger than the inner diameter of the upper bivalve polish rod protective cylinder 11 and the inner diameter of the lower bivalve polish rod protective cylinder 13, the upper part of the bivalve sealing box protective cylinder 12 extends upwards to form an upper bivalve tube body 121 with a reduced inner diameter, and the lower part of the bivalve sealing box protective cylinder extends downwards to form a lower bivalve tube body 122 with a reduced inner diameter. The outer wall of the lower end of the upper bivalve polish rod protecting cylinder 11 is in threaded connection with the inner wall of the upper bivalve tube body 121, and the inner wall of the lower bivalve tube body 122 is in threaded connection with the outer wall of the upper end of the lower bivalve polish rod protecting cylinder 13.

It can be understood that the outer wall of the lower end of the upper bivalve polish rod protecting cylinder 11 is provided with an external thread, the inner wall of the upper bivalve tube body 121 and the inner wall of the lower bivalve tube body 122 are both provided with an internal thread, the outer wall of the middle part and the outer wall of the upper end of the lower bivalve polish rod protecting cylinder 13 are both provided with an external thread, and the inner wall of the bivalve clamp head 14 is provided with an internal thread. When the threads of the double-petal structures are machined, corresponding threads are machined at the positions of the integral upper double-petal polished rod retaining cylinder 11, the double-petal sealing box retaining cylinder 12, the lower double-petal polished rod retaining cylinder 13 and the double-petal clamp head 14 where the threads need to be machined, and then the double-petal structures are separated from the middle of the double-petal structures, so that the threads of the double-petal structures are ensured to correspond. The central hole 131 is formed by two semi-circles in a butt joint manner.

Further, in order to ensure the sealing property and the fixing strength after the abutting and closing of the respective bivalve structures, as shown in fig. 4, 5 and 9, a top bivalve chuck 15 is fixedly clamped on the outer side of the upper bivalve polish rod protective cylinder 11 and below the exhaust hole 111, an upper bivalve chuck 16 is fixedly clamped on the outer side of the upper bivalve tube body 121, and a lower bivalve chuck 17 is fixedly clamped on the outer side of the lower bivalve tube body 122.

In detail, the top bivalve chuck 15, the upper bivalve chuck 16 and the lower bivalve chuck 17 are respectively provided with a top mounting hole, an upper mounting hole and a lower mounting hole at the center, and the shapes of the top mounting hole, the upper mounting hole and the lower mounting hole are respectively matched with the shapes of the outer walls of the upper bivalve polish rod protective cylinder 11, the upper bivalve tube body 121 and the lower bivalve tube body 122. The top bivalve chuck 15, the upper bivalve chuck 16 and the lower bivalve chuck 17 are formed by butt joint of two split chucks, and the two split chucks are fixedly connected through bolts. It can be understood that the top mounting hole, the upper mounting hole and the lower mounting hole are also formed by butting two semicircular holes.

In practical applications, in order to ensure that the threads on the two semicircular protective cylinders of the two-petal sealed box protective cylinder 12 can correspond to each other when the two semicircular protective cylinders are butted during installation, as shown in fig. 12, 13 and 15, at least two upper annular two-petal locking grooves 1211 are circumferentially arranged on the outer wall of the upper two-petal tube body 121 along the axial direction thereof, at least two upper two-petal locking snap rings 161 are circumferentially arranged on the hole wall of the upper installation hole along the axial direction thereof, the number of the upper two-petal locking snap rings 161 is the same as the number of the upper annular two-petal locking grooves 1211, and the upper two-petal locking snap rings 161 can be snapped into the corresponding upper annular two-petal locking grooves 1211. The outer wall of bivalve body 122 is equipped with two at least annular bivalve locked grooves 1221 down along its axial spacer ring down, and the pore wall of mounting hole is equipped with two at least bivalve lock snap rings down along its axial spacer ring down, and the quantity of bivalve lock snap ring is the same with annular bivalve locked groove 1221's quantity down, and lower bivalve lock snap ring can block to be established in the annular bivalve locked groove 1221 down that corresponds.

In order to ensure that the threads on the two semicircular guard cylinders of the upper bivalve polish rod guard cylinder 11 can correspond when the two semicircular guard cylinders are butted during installation, as shown in fig. 14, at least two top annular bivalve locking grooves 112 are arranged on the outer wall of the upper bivalve polish rod guard cylinder 11 along the axial spacing ring thereof, at least two top bivalve locking snap rings are arranged on the hole wall of the top installation hole along the axial spacing ring thereof, the number of the top bivalve locking snap rings is the same as that of the top annular bivalve locking grooves 112, and the top bivalve locking snap rings can be clamped in the corresponding top annular bivalve locking grooves 112.

It can be understood that each annular bivalve locking groove is formed by butting two split locking grooves, and each bivalve locking snap ring is formed by butting two split locking snap rings. The number of the annular double-flap lock grooves is determined as needed, and two upper annular double-flap lock grooves 1211, two lower annular double-flap lock grooves 1221, and two top annular double-flap lock grooves 112 are provided in common in this embodiment.

During installation, in the third step, before the two semicircular casings of the two-piece sealing box casing 12 are aligned and then the two-piece sealing box casing 12 is screwed, the two split chucks of the lower two-piece chuck 17 are wrapped outside the lower two-piece tube body 122, and the lower two-piece lock snap ring on the lower two-piece chuck 17 is ensured to be correspondingly clamped with the lower annular two-piece lock groove 1221 on the lower two-piece tube body 122; wrapping the two split chucks of the upper double-disc chuck 16 outside the upper double-disc tube body 121, and ensuring that the upper double-disc lock snap ring 161 on the upper double-disc chuck 16 is correspondingly clamped with the upper annular double-disc lock groove 1211 on the upper double-disc tube body 121; then, the two split chucks of the lower split chuck 17 are fixed by the bolt lock, and the two split chucks of the upper split chuck 16 are fixed by the bolt lock. Thus, through the matching of the bivalve lock snap rings on the lower bivalve chuck 17 and the upper bivalve chuck 16 and the annular bivalve lock grooves on the bivalve sealing box protecting cylinder 12, the two semicircular protecting cylinder threads of the bivalve sealing box protecting cylinder 12 can be ensured to be corresponding and closed more closely, and the installation is firmer. After the lower bivalve chuck 17 and the upper bivalve chuck 16 are installed, the bivalve sealing box protective cylinder 12 is screwed to fix the lower end of the bivalve sealing box protective cylinder 12 and the upper end of the lower bivalve polished rod protective cylinder 13 through threads.

In the fourth step, after aligning the two semicircular casings of the upper bivalve polish rod casing 11, before screwing the upper bivalve polish rod casing 11, the two split chucks of the top bivalve chuck 15 are wrapped outside the upper bivalve polish rod casing 11, the top bivalve lock snap ring on the top bivalve chuck 15 is correspondingly clamped with the top annular bivalve lock groove 112 on the upper bivalve polish rod casing 11, and then the two split chucks of the top bivalve chuck 15 are locked and fixed by using bolts. In this way, through the cooperation of the top bivalve lock snap ring on the top bivalve chuck 15 and the top annular bivalve lock groove 112 on the upper bivalve polish rod casing 11, it can be ensured that the two semicircular casing threads of the upper bivalve polish rod casing 11 correspond and are closed more tightly, and the installation is firmer. After the top bivalve chuck 15 is installed, the upper bivalve polish rod protective cylinder 11 is screwed in a screwing mode, so that the lower end of the upper bivalve polish rod protective cylinder 11 is fixed with the upper end of the bivalve sealing box protective cylinder 12 through threads.

When the double-disc polished rod protective barrel is disassembled, the top double-disc chuck 15, the upper double-disc chuck 16 and the lower double-disc chuck 17 need to be disassembled in sequence, and then the upper double-disc polished rod protective barrel 11 and the double-disc sealing box protective barrel 12 need to be disassembled in sequence.

Therefore, by the arrangement of the lower bivalve chuck 17, the upper bivalve chuck 16 and the top bivalve chuck 15, the fixing strength and the sealing performance of the integral casing composed of the upper bivalve polish rod protective cylinder 11, the bivalve sealing box protective cylinder 12 and the lower bivalve polish rod protective cylinder 13 can be ensured.

Further, in order to further avoid the possibility of the polish rod 22 from being blown up, as shown in fig. 5, 9, 11 and 14, a plurality of upper double-petal sawtooth-shaped inverted gear rings 113 and a plurality of lower double-petal sawtooth-shaped inverted gear rings 132 are respectively provided around the inner wall of the upper double-petal polish rod guard 11 and the inner wall of the lower double-petal polish rod guard 13 in the axial direction thereof at intervals.

Wherein, the inclined plane of the upper bivalve sawtooth-shaped inverted gear ring 113 is arranged obliquely downwards from the side wall of the upper bivalve polish rod protective cylinder 11 to the inner cavity of the upper bivalve polish rod protective cylinder 11, and the inclined plane of the lower bivalve sawtooth-shaped inverted gear ring 132 is arranged obliquely downwards from the side wall of the lower bivalve polish rod protective cylinder 13 to the inner cavity of the lower bivalve polish rod protective cylinder 13. An annular upper bivalve sawtooth tooth space is formed between two adjacent upper bivalve sawtooth-shaped inverted gear rings 113, and an annular lower bivalve sawtooth tooth space is formed between two adjacent lower bivalve sawtooth-shaped inverted gear rings 132. It can be understood that the upper and lower bivalve zigzag inverted tooth rings 113 and 132 are formed by two split inverted tooth rings in a butt joint manner, and the upper and lower bivalve zigzag tooth spaces are formed by two split tooth spaces in a butt joint manner. Thus, after the annular grease injection space is filled with the curing resin and cured, the curing resin can coat the polish rod 22 to form a certain axial extrusion force on the polish rod 22, the curing resin forms an upper sawtooth-shaped inverted tooth ring capable of being meshed with the upper double-petal sawtooth-shaped tooth socket in the upper double-petal polish rod protective cylinder 11, and the curing resin forms a lower sawtooth-shaped inverted tooth ring capable of being meshed with the lower double-petal sawtooth-shaped tooth socket in the lower double-petal polish rod protective cylinder 13. The upper sawtooth-shaped inverted tooth ring and the lower sawtooth-shaped inverted tooth ring are respectively matched with the upper bivalve sawtooth-shaped tooth socket and the lower bivalve sawtooth-shaped tooth socket, so that cured resin can only move downwards and cannot move upwards.

Therefore, when the polish rod 22 is subjected to the pressure of the bottom hole to move up, the polish rod 22 can be prevented from moving up by the inverted tooth-like structure formed inside the upper and lower double-lobed polish rod retainers 11 and 13 by the cured resin.

Further, in order to facilitate the processing and installation of the lower bivalve polish rod protecting cylinder 13 and ensure the strength requirement of the lower bivalve polish rod protecting cylinder 13, as shown in fig. 11, the lower bivalve polish rod protecting cylinder 13 includes a first bivalve diameter-changing protecting cylinder 133, a second bivalve diameter-changing protecting cylinder 134 and a third bivalve diameter-changing protecting cylinder 135, the outer diameters of which are sequentially increased from bottom to top, the bivalve collar head 14 is screwed with the second bivalve diameter-changing protecting cylinder 134, and the upper end of the third bivalve diameter-changing protecting cylinder 135 is screwed with the lower end of the bivalve sealing box protecting cylinder 12.

The inner diameters of the first double-petal reducing guard barrel 133, the second double-petal reducing guard barrel 134 and the third double-petal reducing guard barrel 135 may be the same, or the inner diameters of the first double-petal reducing guard barrel, the second double-petal reducing guard barrel and the third double-petal reducing guard barrel may be sequentially increased from bottom to top, specifically according to actual needs. The inner diameter of the oil well sealing steel ring 25 is larger than the maximum outer diameter of the lower bivalve polish rod casing 13, that is, the outer diameter of the third bivalve reducing casing 135, so as to facilitate the installation and the disassembly.

Further, in order to match the shape of the bivalve seal cartridge 12 with the shape of the polish rod seal cartridge 23, as shown in fig. 12, two symmetrically disposed wing cylinders 123 are formed to protrude outward from the side wall of the bivalve seal cartridge 12, the axial direction of the wing cylinders 123 extends in the radial direction of the bivalve seal cartridge 12, and the wing cylinders 123 communicate with the inside of the bivalve seal cartridge 12. When the packing side wing boxes on two sides of the polish rod sealing box 23 are installed, the packing side wing boxes are embedded in the corresponding side wing cylinders 123. In addition, each component of the whole blowout prevention nipple 10 is generally made of steel.

Further, this embodiment still provides a production tree 20, production tree 20 has the vertical direction through-going oil flow passageway, is fixed with oil well clamp head 21 in the top mouth department of oil flow passageway, and the internal energy of oil flow passageway is inserted with polished rod 22 with sliding up and down, and oil well clamp head 21 is stretched out to the upper end of polished rod 22 to the cover is equipped with polished rod seal box 23 and seal box clamp head 24 on the polished rod 22 that stretches out oil well clamp head 21 part, and the upper end of seal box clamp head 24 is fixed with the lower extreme of polished rod seal box 23.

The blowout-preventing short joint 10 is sleeved on the outer side of the polish rod 22, the upper end of the polish rod 22 is positioned in the upper bivalve polish rod protective cylinder 11, the polish rod sealing box 23 and the sealing box clamping head 24 are embedded in the bivalve sealing box protective cylinder 12, and the lower end of the polish rod 22 penetrates out of the central hole 131. An oil well sealing steel ring 25 is clamped between the lower end of the double-flap clamp head 14 and the upper end of the oil well clamp head 21, and the double-flap clamp head 14 and the oil well clamp head 21 are locked and fixed through an oil well slip 26. Annular grease injection spaces are formed among the inner wall of the upper bivalve polish rod protective cylinder 11, the inner wall of the bivalve sealing box protective cylinder 12, the inner wall of the lower bivalve polish rod protective cylinder 13, the outer wall of the polish rod 22, the outer wall of the polish rod sealing box 23 and the outer wall of the sealing box clamping head 24.

The oil well clamp head 21 is a full-circle annular clamp head, the lower end of the oil well clamp head is fixed with the top opening of the oil flow channel through threads, the inner wall of the upper end of the oil well clamp head is an upward gradually-expanding conical surface, and the outer wall of the upper portion of the oil well clamp head is an upward gradually-expanding conical surface. The lower inner wall of the above-mentioned two-piece clip head 14 is a tapered surface gradually expanding downward, and the lower outer wall thereof is a tapered surface gradually expanding downward. An upper convex ring 251 with a reduced outer diameter is formed by extending upwards on the top surface of the oil well sealing steel ring 25, and the outer wall of the upper convex ring 251 is a conical surface which is gradually reduced upwards and is matched with the conical surface of the inner wall of the lower end of the double-petal hoop head 14; the bottom surface of the oil well sealing steel ring 25 extends downwards to form a lower convex ring with a reduced outer diameter, and the outer wall of the lower convex ring is a conical surface which is gradually reduced downwards and is matched with the conical surface of the inner wall of the upper end of the oil well clamp head 21. Generally, in order to improve the sealing property, copper layers are provided on the outer walls of the upper and lower collars 251 and 251.

The oil well slips 26 are double-disc slips, and are formed by two semi-arc slips and locked and fixed through bolts, and the inner wall of the upper end of the oil well slips 26 is a conical surface which is gradually reduced upwards and is matched with the conical surface of the outer wall of the lower part of the double-disc clamp head 14; the inner wall of the lower end of the oil well slip 26 is a conical surface which is gradually reduced downwards and is matched with the conical surface of the outer wall of the upper part of the oil well clamp head 21. During installation, two semi-arc slips of the oil well slips 26 are wrapped on the outer sides of the oil well hoop head 21 and the bivalve hoop head 14, and then the two semi-arc slips are locked and fixed through bolts; when the bolts are screwed down, the two semi-arc slips contract, the upper end inner wall conical surface and the lower end inner wall conical surface of the oil well slip 26 respectively extrude the lower outer wall conical surface of the double-disc slip head 14 and the upper outer wall conical surface of the oil well slip head 21, and meanwhile, the lower end inner wall conical surface of the double-disc slip head 14 and the upper end inner wall conical surface of the oil well slip head 21 are tightly attached to the outer wall conical surface of the upper convex ring 251 and the outer wall conical surface of the lower convex ring, so that sealing, locking and fixing are realized. The structures of the oil well collar head 21, the oil well sealing steel ring 25, the oil well slip 26, the polish rod 22, the polish rod sealing box 23 and the sealing box collar head 24 are all the prior art, and detailed description is omitted here.

For the Christmas tree 20, when the installed oil well needs blowout prevention operation, the blowout prevention nipple 10 is installed, after the gas injection of the adjacent well is finished, the blowout prevention nipple 10 is removed, and the oil well continues to be subjected to oil extraction operation. The mounting and dismounting process of the blowout prevention sub 10 has been described in detail in the mounting step and the dismounting step, and is not described in detail here. The installation of production tree 20 in this embodiment can play effectual preventing spouting behind foretell prevent spouting nipple joint 10, and does not need the crane operation when installing and dismantling prevent spouting nipple joint 10, greatly reduced intensity of labour, improved work efficiency.

Further, in order to achieve a better limiting effect on the sealing box hoop head 24 of the polish rod sealing box 23, as shown in fig. 9 and 16, the blowout prevention pup joint 10 further comprises an upper double-petal clamping support plate 18 and a lower double-petal clamping support plate 19, the upper double-petal clamping support plate 18 is clamped and fixed on the outer wall of the polish rod 22 and located at the top position of the polish rod sealing box 23, and the lower double-petal clamping support plate 19 is clamped and fixed on the outer wall of the polish rod 22 and located at the bottom position of the hoop head.

In detail, the upper bivalve card supporting plate 18 and the lower bivalve card supporting plate 19 are both located in the bivalve sealing box protective cylinder 12, through holes are formed in the centers of the upper bivalve card supporting plate 18 and the lower bivalve card supporting plate 19, the shape of each through hole is matched with that of the polish rod 22, the upper bivalve card supporting plate 18 and the lower bivalve card supporting plate 19 are formed by butt joint of two split card supporting plates, and the two split card supporting plates are fixedly connected through bolts. It can be understood that the through holes of the upper and lower bivalve card-supporting plates 18 and 19 are formed by butting two semicircular holes.

During installation, in the first step, after the polish rod sealing box 23 and the sealing box hoop head 24 are lifted to the predetermined position of the polish rod 22, the lower bivalve clamping plate 19 is firstly installed below the sealing box hoop head 24, so that the polish rod sealing box 23 and the sealing box hoop head 24 fall on the lower bivalve clamping plate 19; then, the bivalve card supporting plate 18 is arranged above the polish rod sealing box 23, so that the polish rod sealing box 23 can be limited, and the polish rod sealing box 23 can be fixed. Since the gap between the upper bivalve retainer plate 18 and the top surface of the bivalve seal box protective cylinder 12 and the gap between the lower bivalve retainer plate 19 and the bottom surface of the bivalve seal box protective cylinder 12 are filled with the curing resin and cured together, when the bottom hole pressure is higher, the polish rod 22 can be further prevented from moving upwards through the action of the upper bivalve retainer plate 18 and the lower bivalve retainer plate 19.

Meanwhile, the diameter of the through hole at the center of the upper and lower bivalve card supporting plates 18 and 19 is the same as that of the polish rod 22, and after the upper and lower bivalve card supporting plates 18 and 19 are clamped on the polish rod 22, there is almost no gap with the polish rod 22. Thus, when the curing resin and the curing agent are injected, the curing resin and the curing agent can be prevented from flowing into the annular gap between the polish rod 22 and the polish rod sealing box 23 and the annular gap between the polish rod 22 and the sealing box clamping head 24, and the cured resin can be more conveniently cleaned in the subsequent disassembly of the blowout prevention nipple 10.

In addition, when the liquid pressure in the well acts on the gap between the polish rod 22 and the central hole 131, the pressure of 0.8MPa is reserved when the solidified resin is filled through the grease injection hole 141, the volume expansion rate of the solidified resin is 2% after the solidified resin is solidified, the solidified resin can be tightly attached to the polish rod 22, and the solidified resin formed between the polish rod 22 and the annular grease injection space can be ensured to be a sealing structure under the action of the upper bivalve clamping supporting plate 18 and the lower bivalve clamping supporting plate 19, so that the pressure of 8-10 MPa can be borne and prevented from being leaked.

When the blowout prevention nipple 10 is disassembled, the lower bivalve polish rod protection barrel 13 is taken out, part of the cured resin protection is taken out, the upper bivalve clamping supporting plate 18 and the lower bivalve clamping supporting plate 19 are firstly disassembled, and then the polish rod sealing box 23 and the sealing box hoop head 24 are installed back to a wellhead.

Therefore, in the embodiment, on one hand, the whole blowout prevention nipple 10, the polish rod 22, the polish rod seal box 23 and the seal box clamp head 24 can be integrally fixed together through the curing action of the curing resin, so that the integral fixing action and the sealing action are achieved, when the bottom hole pressure rises due to steam channeling, the pressure can act on the bottom surface of the lower double-petal polish rod casing 13, and as all the components are integrally cured and the oil well clamp head 21 is fixedly connected with a well head, the polish rod 22 can be prevented from channeling; the gap between the polish rod 22 and the center hole 131 of the lower bivalve polish rod protector 13 is small, and the gap is filled with resin and cured after the resin is injected, and therefore, steam cannot be ejected upward from the gap.

On the other hand, when the bottom hole pressure is particularly high and the polish rod 22 moves upward, the cured resin is cured with the polish rod 22 into a whole, and the cured resin can be further prevented from moving upward by the arrangement of the upper double-petal sawtooth-shaped inverted gear ring 113 on the inner wall of the upper double-petal polish rod guard 11 and the lower double-petal sawtooth-shaped inverted gear ring 132 on the inner wall of the lower double-petal polish rod guard 13, so that the polish rod 22 moves upward;

on the other hand, because the upper bivalve card supporting plate 18 and the lower bivalve card supporting plate 19 are both clamped and fixed on the polish rod 22, and simultaneously, the gap between the upper bivalve card supporting plate 18 and the top surface of the bivalve seal box protective cylinder 12 and the gap between the lower bivalve card supporting plate 19 and the bottom surface of the bivalve seal box protective cylinder 12 are both filled with the cured resin, the top surface and the bottom surface of the bivalve seal box protective cylinder 12 also play a role in axially limiting the cured resin at the gap, therefore, when the bottom hole pressure is extremely high and the polish rod 22 moves up, the polish rod 22 can be further prevented from moving up due to the existence of the upper bivalve card supporting plate 18 and the lower bivalve card supporting plate 19.

Therefore, in the present embodiment, through the curing action of the curing resin, the above-mentioned inverted tooth structure and the arrangement of the upper and lower double- petal clamping plates 18 and 19 can prevent the polish rod 22 from jumping upwards from all aspects, and a better blowout prevention effect is achieved.

In summary, the blowout prevention sub 10 and the christmas tree 20 in the present embodiment have the following effects:

1. the blowout prevention pup joint 10 can be assembled in a split mode by means of a double-petal structure;

2. the polish rod sealing box 23 and the sealing box hoop head 24 can be coated through the bivalve sealing box protective barrel 12, the polish rod 22 does not need to be separated when the blowout prevention nipple 10 is installed, and the assembly and disassembly are more convenient;

3. the adoption of the cured resin can realize the circumferential full sealing of the polish rod 22 and a wellhead and improve the sealing performance;

4. the polish rod 22 is clamped by the upper bivalve clamping supporting plate 18 and the lower bivalve clamping supporting plate 19, the upper bivalve clamping supporting plate 18 and the lower bivalve clamping supporting plate 19 are coated by the solidified resin, and meanwhile, the sealing performance can be enhanced and the polish rod 22 is prevented from jumping upwards through the matching of the upper bivalve sawtooth-shaped inverted gear ring 113 on the inner wall of the upper bivalve polish rod protecting cylinder 11 and the lower bivalve sawtooth-shaped inverted gear ring 132 on the inner wall of the lower bivalve polish rod protecting cylinder 13;

5. the whole blowout prevention short joint 10 is assembled in sections, so that the weight of a single body can be reduced, and the operation is more convenient;

6. when the blowout prevention nipple 10 is installed, the thread correspondence and the stability of the bivalve structure can be ensured by utilizing the corresponding matching of each annular bivalve locking groove and each bivalve locking clamping ring.

Therefore, in the embodiment, when the blowout prevention nipple 10 is installed on the Christmas tree 20, the split structure is used for establishing the sealing space, the curable curing resin is filled, and the polished rod 22 and the polished rod sealing box 23 are circumferentially sealed, so that when the blowout prevention nipple 10 is installed in a channeling-preventing well, the hoisting operation by a crane is not needed, the installation workload can be reduced, and the labor intensity can be reduced.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (12)

1. A blowout prevention nipple joint is characterized by comprising an upper bivalve polish rod protecting cylinder with a closed upper end and an open lower end, a bivalve sealing box protecting cylinder with open two ends and a lower bivalve polish rod protecting cylinder with an open upper end and a closed lower end;

the upper bivalve polish rod protective cylinder, the bivalve sealing box protective cylinder and the lower bivalve polish rod protective cylinder are sequentially fixed by threads from top to bottom, and the upper bivalve polish rod protective cylinder, the bivalve sealing box protective cylinder and the lower bivalve polish rod protective cylinder are formed by butt joint of two semicircular protective cylinders;

the outer wall of the lower bivalve polished rod casing is fixed with a bivalve hoop head through threads, and the bivalve hoop head is formed by butt joint of two semicircular hoop heads; the bottom surface of the lower bivalve polished rod casing is provided with a central hole, the side wall of the lower bivalve polished rod casing and the upper part of the bivalve clamp head are provided with grease injection holes, and the side wall of the top of the upper bivalve polished rod casing is provided with exhaust holes.

2. The blowout prevention sub of claim 1,

the inner diameter of the bivalve sealing box protective cylinder is larger than that of the upper bivalve polished rod protective cylinder and that of the lower bivalve polished rod protective cylinder, the upper part of the bivalve sealing box protective cylinder extends upwards to form an upper bivalve tube body with a reduced inner diameter, and the lower part of the bivalve sealing box protective cylinder extends downwards to form a lower bivalve tube body with a reduced inner diameter; the outer wall of the lower end of the upper bivalve polish rod protecting cylinder is in threaded connection with the inner wall of the upper bivalve tube body, and the inner wall of the lower bivalve tube body is in threaded connection with the outer wall of the upper end of the lower bivalve polish rod protecting cylinder.

3. The blowout prevention sub of claim 2,

go up the outside of bivalve polished rod casing and be located the below card of exhaust hole is established and is fixed with a bivalve chuck the outside card of going up bivalve body is established and is fixed with last bivalve chuck the outside card of bivalve body is established and is fixed with lower bivalve chuck down.

4. The blowout prevention sub of claim 3,

the center of the top bivalve chuck, the center of the upper bivalve chuck and the center of the lower bivalve chuck are respectively provided with a top mounting hole, an upper mounting hole and a lower mounting hole, and the shapes of the top mounting hole, the upper mounting hole and the lower mounting hole are respectively matched with the shapes of the outer walls of the upper bivalve polished rod protective cylinder, the upper bivalve tube body and the lower bivalve tube body; the top bivalve chuck, go up bivalve chuck and the bivalve chuck constitutes by two split chucks butt joints down, just two the split chuck passes through bolt fixed connection.

5. The blowout prevention sub of claim 4,

the outer wall of the upper bivalve pipe body is provided with at least two upper annular bivalve locking grooves along the axial spacing ring, the hole wall of the upper mounting hole is provided with at least two upper bivalve locking snap rings along the axial spacing ring, the number of the upper bivalve locking snap rings is the same as that of the upper annular bivalve locking grooves, and the upper bivalve locking snap rings can be clamped in the corresponding upper annular bivalve locking grooves;

the outer wall of bivalve body is equipped with two at least annular bivalve locked grooves down along its axial spacer ring down the pore wall of mounting hole is equipped with two at least bivalve lock snap rings down along its axial spacer ring, down the quantity of bivalve lock snap ring with down the quantity in annular bivalve locked groove is the same, bivalve lock snap ring can block to establish under corresponding in the annular bivalve locked groove.

6. The blowout prevention sub of claim 4,

go up bivalve polished rod and protect the outer wall of a section of thick bamboo and be equipped with two at least annular bivalve locked grooves of top along its axial spacer ring the pore wall of top mounting hole is equipped with two at least bivalve lock snap rings of top along its axial spacer ring, the quantity of top bivalve lock snap ring with the quantity in the annular bivalve locked groove of top is the same, top bivalve lock snap ring can block to establish and correspond in the annular bivalve locked groove of top.

7. The blowout prevention sub of claim 1,

and a plurality of upper bivalve sawtooth-shaped inverted gear rings and a plurality of lower bivalve sawtooth-shaped inverted gear rings are respectively arranged on the inner wall of the upper bivalve polished rod protective cylinder and the inner wall of the lower bivalve polished rod protective cylinder at intervals along the axial direction of the upper bivalve polished rod protective cylinder and the lower bivalve polished rod protective cylinder in a ring mode.

8. The blowout prevention sub of claim 1,

the lower bivalve polish rod protecting cylinder comprises a first bivalve reducing protecting cylinder, a second bivalve reducing protecting cylinder and a third bivalve reducing protecting cylinder, wherein the outer diameter of the lower bivalve polish rod protecting cylinder is increased from bottom to top in sequence, the bivalve clamp head is in threaded fixation with the second bivalve reducing protecting cylinder, and the upper end of the third bivalve reducing protecting cylinder is in threaded fixation with the lower end of the bivalve sealing box protecting cylinder.

9. The blowout prevention sub of claim 1,

the side wall of the bivalve sealing box protective cylinder protrudes outwards to form two symmetrically arranged side wing cylinders, the axial direction of each side wing cylinder extends along the radial direction of the bivalve sealing box protective cylinder, and the side wing cylinders are communicated with the inside of the bivalve sealing box protective cylinder.

10. A Christmas tree which is provided with an oil flow channel which is vertically communicated, an oil well clamp head is fixed at the top opening of the oil flow channel, a polish rod is inserted in the oil flow channel in a vertically sliding manner, the upper end of the polish rod extends out of the oil well clamp head, a polish rod sealing box and a sealing box clamp head are sleeved on the polish rod extending out of the oil well clamp head part, the upper end of the sealing box clamp head is fixed with the lower end of the polish rod sealing box, the Christmas tree is characterized in that,

the blowout prevention nipple according to any one of claims 1 to 9 is sleeved on the outer side of the polish rod, the upper end of the polish rod is positioned in the upper bivalve polish rod protective barrel, the polish rod sealing box and the sealing box clamping head are embedded in the bivalve sealing box protective barrel, and the lower end of the polish rod penetrates out of the central hole; an oil well sealing steel ring is clamped between the lower end of the bivalve clamp head and the upper end of the oil well clamp head, and the bivalve clamp head and the oil well clamp head are locked and fixed through an oil well slip;

and annular grease injection spaces are formed among the inner wall of the upper bivalve polish rod protecting cylinder, the inner wall of the bivalve sealing box protecting cylinder, the inner wall of the lower bivalve polish rod protecting cylinder, the outer wall of the polish rod sealing box and the outer wall of the sealing box clamping head.

11. The Christmas tree of claim 10,

the blowout prevention pup joint further comprises an upper bivalve clamping support plate and a lower bivalve clamping support plate, the upper bivalve clamping support plate is clamped and fixed on the outer wall of the polished rod and located at the top position of the polished rod sealing box, and the lower bivalve clamping support plate is clamped and fixed on the outer wall of the polished rod and located at the bottom position of the sealing box clamp head.

12. The Christmas tree of claim 11,

the center of the upper bivalve clamping supporting plate and the center of the lower bivalve clamping supporting plate are both provided with through holes, the shapes of the through holes are matched with the shape of the polished rod, the upper bivalve clamping supporting plate and the lower bivalve clamping supporting plate are formed by butt joint of two split clamping supporting plates, and the two split clamping supporting plates are fixedly connected through bolts.

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