A method for connecting flanges of a Christmas tree to prevent bolt loosening

Abstract

The utility model discloses a kind of oil tree flange connecting structure of preventing bolt loosening. It is convenient to discharge crystallizing tank, comprising: oil tree body, one end of the oil tree body is connected with oil pipe, and connecting mechanism is installed between the oil pipe and the oil tree body;The connecting mechanism includes first connecting flange installed on the oil tree body and second connecting flange installed on the oil pipe, a plurality of bolts are installed between the first connecting flange and the second connecting flange, and nut is installed on the bolt.The oil tree flange connecting structure of preventing bolt loosening provided by the utility model sets up hexagon counterbore on first connecting flange, and installs support ring, plug-in pipe, fixing frame and screw, so that the loosening drag effect of bolt and nut on bolt is effectively improved, the stability of flange connection is improved, and then the use stability of wellhead oil tree equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of flange connection technology, and in particular to a flange connection structure for preventing bolt loosening in oil wellheads. Background Technology

[0002] The Christmas tree is a wellhead device used in flowing wells and mechanically operated wells to extract oil. It is the main equipment at the top of the oil and gas well for controlling and regulating oil and gas production. The Christmas tree is installed directly above the casing head and connected by flange bolts or clamps to form a pressure seal.

[0003] The wellhead Christmas system is prone to vibration during operation, which can cause the bolted connection between the wellhead Christmas system and the tubing flange to loosen (mainly the nuts to loosen), making the connection between the flanges less secure and reducing the stability of the wellhead Christmas system.

[0004] Therefore, it is necessary to provide a treehouse flange connection structure that prevents bolt loosening to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the existing technology, this utility model provides a production tree flange connection structure that prevents bolt loosening, which can improve the stability of the flange connection and improve the operational stability of the wellhead production tree equipment.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The oil wellhead flange connection structure for preventing bolt loosening includes: an oil wellhead body, one end of which is connected to an oil pipe, and a connection mechanism installed between the oil pipe and the oil wellhead body; the connection mechanism includes a first connection flange installed on the oil wellhead body and a second connection flange installed on the oil pipe, multiple bolts are installed between the first and second connection flanges, nuts are installed on the bolts, countersunk holes with anti-loosening effect are opened on the first connection flange, a support ring is fitted on the oil pipe, multiple insertion pipes are rotatably installed on the support ring, insertion holes are opened in the middle of the insertion pipes, a fixing bracket is installed on the insertion pipes, and screws are installed on the fixing bracket.

[0008] Preferably, the number of screws is two.

[0009] Preferably, multiple insertion posts are fixedly installed on the outside of the insertion tube, and multiple limiting grooves are opened on the fixing frame.

[0010] Preferably, tensioning elements are installed between adjacent fixing frames.

[0011] Preferably, the tensioning element includes two clamping plates, with a clamping groove on the outer side of the clamping plates, and a knob installed between the two clamping plates. Two studs with opposite thread directions are installed at both ends of the knob, and the studs are threadedly connected to the clamping plates.

[0012] Preferably, an anti-loosening nut is installed on the stud.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) By setting a hexagonal countersunk hole on the first connecting flange and installing a support ring, plug pipe, fixing bracket and screw, the loosening and dragging effect of the bolt and the nut on the bolt is effectively improved, thereby improving the stability of the flange connection and thus improving the stability of the wellhead production tree equipment.

[0015] (2) By setting the number of screws to two, this utility model can help improve the relaxation and dragging effect of the device;

[0016] (3) By setting the plug-in post and the limiting groove, this utility model can facilitate the assembly and disassembly of the fixing frame;

[0017] (4) By installing a tensioning element between two adjacent fixed frames, this utility model can make all the fixed frames form a whole, further improving the relaxation dragging effect. Attached Figure Description

[0018] Figure 1 A schematic diagram of the installation position of the oil well flange connection structure for preventing bolt loosening provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows the structural schematic of the connection mechanism in the oil wellhead flange connection structure designed to prevent bolt loosening.

[0020] Figure 3 for Figure 1 The diagram shows the structure of the first connecting flange in the anti-loosening tree flange connection structure.

[0021] Figure 4 for Figure 1 The diagram shows the installation structure of the insertion pipe and fixing bracket in the oil wellhead flange connection structure to prevent bolt loosening;

[0022] Figure 5 for Figure 1 The diagram shows the structure of the insertion pipe in the oil wellhead flange connection structure to prevent bolt loosening;

[0023] Figure 6 for Figure 1 The diagram shows the structural schematic of the fixing frame in the oil wellhead flange connection structure designed to prevent bolt loosening.

[0024] Figure 7 for Figure 1A schematic diagram of one embodiment of the pre-works tree flange connection structure for preventing bolt loosening is shown.

[0025] Figure 8 for Figure 7 The diagram shows the structure of the tensioning element in the oil wellhead flange connection structure designed to prevent bolt loosening.

[0026] The corresponding names of the attached figures are as follows: 1-Oil production tree body, 2-Oil tubing, 3-Connecting mechanism, 4-Tensioning element, 5-Clamping plate, 6-Clamping groove, 7-Knob, 8-Stud, 9-Anti-loosening nut, 11-First connecting flange, 12-Counterhole, 21-Second connecting flange, 31-Bolt, 32-Support ring, 33-Plug in pipe, 331-Plug in post, 34-Plug in hole, 35-Fixing bracket, 351-Limiting groove, 36-Screw. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0028] Example 1:

[0029] like Figure 1-8As shown, the oil wellhead flange connection structure for preventing bolt loosening provided by this utility model includes: an oil wellhead body 1, one end of which is connected to an oil pipe 2, and a connection mechanism 3 installed between the oil pipe 2 and the oil wellhead body 1; the connection mechanism 3 includes a first connection flange 11 installed on the oil wellhead body 1 and a second connection flange 21 installed on the oil pipe 2, multiple bolts 31 are installed between the first connection flange 11 and the second connection flange, and a nut is installed on each bolt 31. A countersunk hole 12 is opened on the first connection flange 11. The upper part of the countersunk hole 12 is hexagonal and the lower part is circular, so that after the tail of the bolt 31 is embedded in the countersunk hole 12, the bolt 31 cannot rotate, thus achieving the effect of preventing loosening and dragging. In addition, a support ring 32 is fitted on the oil pipe 2, and multiple insertion pipes 33 are rotatably installed on the support ring 32. A hexagonal insertion hole 34 is opened in the middle of the insertion pipe 33, and a fixing bracket 35 is installed on the insertion pipe 33. Screws 36 are installed on the fixing bracket 35. In use, first, bolt 31 is passed through the first connecting flange 11 and the second connecting flange 21 in sequence, and the tail of bolt 31 is embedded in the countersunk hole 12, so that bolt 32 cannot be rotated. Then, a nut is screwed onto bolt 31 to seal the connection between the first connecting flange 11 and the second connecting flange 21. To prevent the nut from loosening, the support ring 32 on the oil pipe 2 is moved closer to bolt 31, and the insertion pipe 33 is rotated appropriately so that bolt 31 passes through the insertion pipe 33 and the support ring 32 in sequence, and the nut on the second connecting flange 21 is embedded in the insertion hole 3. 4. Then, screw another nut onto bolt 32 and tighten it, so that the support ring 32 presses the fixing bracket 35 tightly against the second connecting flange 21, preventing the insertion pipe 33 from rotating. This, in turn, prevents the nut on one side of the second connecting flange 21 from loosening through the insertion pipe 33. To improve the loosening effect, a screw 36 with a rounded head is installed on the fixing bracket 35. Tightening the screw 36 so that its end presses firmly against the outside of the support ring 32 further prevents the insertion pipe 33 from rotating in the loosening direction, effectively preventing the nut from loosening. Through these measures, the possibility of the bolted connection structure between the first connecting flange 11 and the second connecting flange 21 loosening due to vibration can be effectively reduced.

[0030] By setting a hexagonal countersunk hole 12 on the first connecting flange 11 and installing a support ring 32, a plug pipe 33, a fixing bracket 35 and a screw 36, the loosening and dragging effect of the bolt 31 and the nut on the bolt 31 is effectively improved, thereby improving the stability of the flange connection and thus improving the operational stability of the wellhead production tree equipment.

[0031] Example 2:

[0032] like Figure 4 and Figure 6As shown, there are two screws 36. When in use, the ends of both screws 36 are pressed tightly against the side of the support ring 32, so that the fixing bracket 35 cannot rotate in any direction, which further improves the loosening and dragging effect of the nut.

[0033] By setting the number of screws 36 to two, the relaxation and dragging effect of the device can be improved.

[0034] Example 3:

[0035] like Figure 4-6 As shown, in this embodiment, multiple plug-in pins 331 are fixedly installed on the outside of the plug-in tube 33, and multiple limiting grooves 351 are opened on the fixing frame 35. When in use, the fixing frame 35 is sleeved on the plug-in tube 33, and the plug-in pins 331 are embedded in the limiting grooves 351, so that the plug-in tube 33 and the fixing frame 35 are plugged in, and the fixing frame 35 is detachable.

[0036] By setting the plug-in post 331 and the limiting groove 351, the mounting bracket 35 can be easily disassembled and assembled.

[0037] Example 4:

[0038] like Figure 7 As shown, a tensioning member 4 is installed between two adjacent fixed frames 35. The tensioning member tensions the two fixed frames 35, thereby making all the fixed frames 35 form a whole, making the fixed frames 35 even more unable to rotate, and further improving the relaxation dragging effect.

[0039] By installing tensioning elements 4 between two adjacent fixing frames 35, all fixing frames 35 can be made into a whole, further improving the relaxation dragging effect.

[0040] Example 5:

[0041] like Figure 8 As shown, the tensioning member 4 includes two clamping plates 5, with a clamping groove 6 on the outer side of the clamping plate 5. The side corner of the fixing frame 35 abuts against the clamping groove 6. A knob 7 is installed between the two clamping plates 5. Two studs 8 with opposite threads are installed at both ends of the knob 7. The studs 8 are threadedly connected to the clamping plates 5. In use, the knob 7 is rotated to move the two clamping plates 5 away from each other, thereby tensioning the two adjacent fixing frames 35.

[0042] By setting a tensioning element 4 including a clamping plate 5, a knob 7 and a stud 8, the distance between the two fixing frames 35 can be adjusted, thereby achieving tensioning of the fixing frames 35.

[0043] Example 6:

[0044] like Figure 8As shown, an anti-loosening nut 9 is installed on the stud 8. When in use, the anti-loosening nut 9 can be tightened so that one end of it is in close contact with the clamping plate 5, thereby achieving a loosening and dragging effect.

[0045] By installing the anti-loosening nut 9 on the stud 8, a good anti-loosening effect can be achieved.

[0046] Working principle: In use, firstly, bolt 31 is passed through the first connecting flange 11 and the second connecting flange 21 in sequence, and the tail of bolt 31 is embedded in the countersunk hole 12, preventing bolt 32 from rotating. Then, a nut is screwed onto bolt 31 to seal the connection between the first connecting flange 11 and the second connecting flange 21. To prevent the nut from loosening, the support ring 32 on the oil pipe 2 is moved closer to bolt 31, and the insertion pipe 33 is rotated appropriately, so that bolt 31 passes through the insertion pipe 33 and the support ring 32 in sequence, and the nut on the second connecting flange 21 is embedded in the insertion pipe. Inside the connection hole 34, screw another nut onto the bolt 32 and tighten it, so that the support ring 32 presses the fixing bracket 35 tightly and adheres it to the second connecting flange 21, making the insertion pipe 33 unable to rotate. In turn, the nut on one side of the second connecting flange 21 cannot be loosened through the insertion pipe 33. In order to improve the loosening effect, a screw 36 is installed on the fixing bracket 35. The end of the screw 36 is rounded. Tighten the screw 36 so that its end is pressed tightly against the outside of the support ring 32, further preventing the insertion pipe 33 from rotating in the loosening direction, thus effectively preventing the nut from loosening.

Claims

1. A flange connection structure for preventing bolt loosening in a wellhead, characterized in that, include: The oil well body (1) is connected to an oil pipe (2) at one end, and a connecting mechanism (3) is installed between the oil pipe (2) and the oil well body (1). The connecting mechanism (3) includes a first connecting flange (11) installed on the tree body (1) and a second connecting flange (21) installed on the tubing (2). Multiple bolts (31) are installed between the first connecting flange (11) and the second connecting flange (21). Nuts are installed on the bolts (31). A countersunk hole (12) with anti-loosening effect is opened on the first connecting flange (11). A support ring (32) is fitted on the tubing (2). Multiple insertion pipes (33) are rotatably installed on the support ring (32). Insertion holes (34) are opened in the middle of the insertion pipes (33). A fixing bracket (35) is installed on the insertion pipes (33). Screws (36) are installed on the fixing bracket (35).

2. The oil wellhead flange connection structure for preventing bolt loosening according to claim 1, characterized in that, The number of screws (36) is two.

3. The oil wellhead flange connection structure for preventing bolt loosening according to claim 1, characterized in that, Multiple plug-in pins (331) are fixedly installed on the outside of the plug tube (33), and multiple limiting grooves (351) are opened on the fixing frame (35).

4. The oil wellhead flange connection structure for preventing bolt loosening according to claim 1, characterized in that, Tensioners (4) are installed between adjacent fixing frames (35).

5. The oil wellhead flange connection structure for preventing bolt loosening according to claim 4, characterized in that, The tensioning member (4) includes two clamping plates (5), with a clamping groove (6) on the outer side of the clamping plate (5). A knob (7) is installed between the two clamping plates (5), and two studs (8) with opposite thread directions are installed at both ends of the knob (7). The studs (8) are threadedly connected to the clamping plate (5).

6. The oil wellhead flange connection structure for preventing bolt loosening according to claim 5, characterized in that, An anti-loosening nut (9) is installed on the stud (8).

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