Tubing head with long service life

Abstract

A tubing head with long service life relates to the technical field of oil extraction well mouths. A protection sleeve is arranged on the outer side of the oil pipe hanger, a bearing sleeve is arranged on the upper portion of the protection sleeve, a protection pipe is arranged on the lower portion of the bearing sleeve, the protection pipe is in threaded connection with the oil pipe hanger, the bearing sleeve abuts against the lower end face of the positioning boss, and the protection pipe is sleeved with a sealing seat. And the sealing seat is hermetically connected with the four-way joint through a conical ring surface. The oil pipe hanger has the advantages that the oil pipe hanger is sealed with the four-way joint through the sealing seat, the split structure can be replaced independently, the protective sleeve is arranged on the outer side of the oil pipe hanger, the anti-scour ring is arranged on the lower portion of the sealing seat, and when blowout is conducted after fracturing, fracturing flowback fluid impacts the protective sleeve and the anti-scour ring, so that the oil pipe hanger can be replaced independently. Therefore, the oil pipe hanger and the sealing seat are protected from being impacted by fracturing flow-back fluid, the protective sleeve, the shaft check ring and the anti-impact ring can be replaced in time after being damaged, the maintenance cost is low, and the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil well head technical field especially relates to long service life's tubing head. BACKGROUND

[0002] The existing fracturing exploitation well head device, the tubing cross generally all vertical intersection, fracturing fluid back flow liquid (containing sand grain) all from the annulus of tubing and casing into the horizontal interface of tubing cross both sides and discharge, the lower end of tubing hanger is usually located at the interface of both sides, after the fracturing back flow liquid flows into the center main through path, the liquid will produce high speed scouring to the tubing hanger, causes the tubing hanger scouring and wearing and perforation damage failure, also causes the damage to the sealing seat of the lower part of tubing hanger, leads to sealing failure, even can cause tubing rupture accident, influences fracturing operation and oil and gas well production. SUMMARY

[0003] In order to solve the low service life of the fracturing well head tubing hanger at present, the utility model provides a long service life's tubing head.

[0004] The utility model discloses a long service life's tubing head, including four ways, the tubing hanger is installed in four ways, and the upper portion of tubing hanger is equipped with the positioning boss, and the outside of tubing hanger is equipped with the protective sleeve, and the upper portion of protective sleeve is equipped with the bearing sleeve, and the lower portion of bearing sleeve is equipped with the protection pipe, and protection pipe is connected with tubing hanger by screw thread, and bearing sleeve is in the lower end surface of positioning boss, and the clearance cooperation between protection pipe and tubing hanger is through sealing ring, and the outside of protection pipe is equipped with the sealing seat, and the upper portion of mixed channel of four ways is processed with the conical hole, and sealing seat sits on the conical hole, and sealing seat is sealedly connected with four ways through the conical ring surface, and the clearance cooperation between sealing seat and protection pipe is through sealing ring, and sealing seat is in the lower surface of bearing sleeve.

[0005] The lower side of protection pipe extends a baffle ring to the inner hole, the inner hole of baffle ring is greater than the outer diameter of the tubing to be suspended, and the outer surface of protection pipe and baffle ring is sprayed with a layer of tungsten carbide plating layer.

[0006] The lower side of protection pipe is processed with a ring groove in sealing seat, and the shaft baffle ring is installed in the ring groove, and the upper portion of shaft baffle ring is installed with the anti-impact ring, and the clearance cooperation between anti-impact ring and mixed channel and protection pipe.

[0007] The inner hole of mixed channel of four ways is sprayed with a layer of tungsten carbide plating layer.

[0008] The baffle ring extends a flow guide sleeve downward, and the outer circle of flow guide sleeve is conical in shape, with the upper part being larger and the lower part being smaller.

[0009] The utility model discloses beneficial effect is: tubing hanger is sealed with four -way through the sealing seat, and the split structure can be replaced alone, and the protective sleeve is arranged outside tubing hanger, and the anti -impact ring is arranged in the lower part of sealing seat, and when putting and spraying after fracturing, fracturing flowback fluid impacts protective sleeve and anti -impact ring, thereby the tubing hanger and sealing seat are protected from fracturing flowback fluid impact, and the protective sleeve, shaft baffle and anti -impact ring can be replaced in time after breakage, and the maintenance cost is low, and the service life is long, and the flow -directing sleeve is arranged at the bottom of protective sleeve, and the flow -directing sleeve shunts fracturing flowback fluid that the well bottom spouts, and further reduces the impact strength of fracturing flowback fluid to protective sleeve, anti -impact ring and oil pipe. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the structure schematic diagram of the utility model; Fig. 1

[0011] Figure 2 is the structure schematic diagram of the four -way in the utility model; Fig. 2 Figure 3 is the structure schematic diagram of the tubing hanger in the utility model;

[0012] Fig. 3 Figure 4 is the structure schematic diagram of the protective sleeve in the utility model;

[0013] Figure 5 is another embodiment structure schematic diagram of the protective sleeve in the utility model. Fig. 4 Figure 1- four -way, 101- conical hole, 102- mixed channel, 2- tubing hanger, 201- positioning boss, 3- sealing seat, 4- protective sleeve, 401- protective tube, 4011- annular groove, 402- baffle ring, 4021- flow -directing sleeve, 403- bearing sleeve, 5- anti -impact ring, 6- shaft baffle.

[0014] DETAILED DESCRIPTION Fig. 5 As shown in figure, a kind of long service life tubing head, including four -way 1, tubing hanger 2 is installed in four -way 1, positioning boss 201 is equipped in the upper portion of tubing hanger 2, protective sleeve 4 is equipped on the outside of tubing hanger 2, bearing sleeve 403 is equipped in the upper portion of protective sleeve 4, protective tube 401 is equipped in the lower portion of bearing sleeve 403, protective tube 401 is connected with tubing hanger 2 by screw thread, bearing sleeve 403 is placed in the lower end surface of positioning boss 201, protective tube 401 and tubing hanger 2 are matched by sealing ring gap, protective sleeve 4 is equipped with sealing seat 3 outside, conical hole 101 is processed in the upper portion of mixed channel 102 of four -way 1 lower portion, sealing seat 3 is seated on conical hole 101, sealing seat 3 is connected with four -way 1 by conical surface, sealing seat 3 and protective tube 401 are matched by sealing ring gap, sealing seat 3 is placed on the lower surface of bearing sleeve 403.

[0015] Specific implementation

[0016] As shown in figure, a kind of long service life tubing head, including four -way 1, tubing hanger 2 is installed in four -way 1, positioning boss 201 is equipped in the upper portion of tubing hanger 2, protective sleeve 4 is equipped on the outside of tubing hanger 2, bearing sleeve 403 is equipped in the upper portion of protective sleeve 4, protective tube 401 is equipped in the lower portion of bearing sleeve 403, protective tube 401 is connected with tubing hanger 2 by screw thread, bearing sleeve 403 is placed in the lower end surface of positioning boss 201, protective tube 401 and tubing hanger 2 are matched by sealing ring gap, protective sleeve 4 is equipped with sealing seat 3 outside, conical hole 101 is processed in the upper portion of mixed channel 102 of four -way 1 lower portion, sealing seat 3 is seated on conical hole 101, sealing seat 3 is connected with four -way 1 by conical surface, sealing seat 3 and protective tube 401 are matched by sealing ring gap, sealing seat 3 is placed on the lower surface of bearing sleeve 403. Figs. 1-5

[0017] ​​​​A protection pipe 401 extends downwardly to the inner hole of the oil pipe hanger 2, and a stop ring 402 is arranged in the inner hole of the protection pipe 401. The inner hole of the stop ring 402 is larger than the outer diameter of the suspended oil pipe. The stop ring 402 is used to protect the lower end surface of the oil pipe hanger 2. The outer surface of the protection pipe 401 and the stop ring 402 is sprayed with a tungsten carbide coating, so as to prolong the service life of the protection sleeve 4.

[0018] The protection pipe 401 is provided with a ring groove 4011 below the sealing seat 3. An axle stop ring 6 is arranged in the ring groove 4011. An anti-impact ring 5 is arranged on the upper portion of the axle stop ring 6. The anti-impact ring 5 is matched with the gap between the mixing channel 102 and the protection pipe 401.

[0019] The oil pipe hanger 2 is sealed with the four-way joint 1 through the sealing seat 3. The split structure can be replaced individually. The protection sleeve 4 is arranged outside the oil pipe hanger 2. The anti-impact ring 5 is arranged below the sealing seat 3. When the fracturing fluid is discharged, the fracturing fluid impacts the protection sleeve 4 and the anti-impact ring 5, so as to protect the oil pipe hanger 2 and the sealing seat 3 from being impacted by the fracturing fluid. The protection sleeve 4, the axle stop ring 6 and the anti-impact ring 5 can be replaced in time after being damaged. The maintenance cost is low, and the service life is long.

[0020] The inner hole of the mixing channel 102 of the four-way joint 1 is sprayed with a tungsten carbide coating, so as to prolong the service life of the four-way joint 1.

[0021] The stop ring 402 extends downwardly to a flow guide sleeve 4021. The outer circle of the flow guide sleeve 4021 is in the shape of a large upper and small lower cone. The flow guide sleeve 4021 divides the fracturing fluid discharged from the bottom of the well, so as to further reduce the impact of the fracturing fluid on the protection sleeve 4, the anti-impact ring 5 and the oil pipe.

Claims

1. A long service life tubing head comprising a four-way (1) characterised in that: The cross (1) is provided with a tubing hanger (2) inside, the upper part of the tubing hanger (2) is provided with a positioning boss (201), the outer side of the tubing hanger (2) is provided with a protective sleeve (4), the upper part of the protective sleeve (4) is provided with a bearing sleeve (403), the lower part of the bearing sleeve (403) is provided with a protective tube (401), the protective tube (401) is threadedly connected with the tubing hanger (2), the bearing sleeve (403) abuts against the lower end surface of the positioning boss (201), the protective tube (401) and the tubing hanger (2) are gap fitted through a sealing ring, the outer side of the protective tube (401) is sleeved with a sealing seat (3), the upper part of the mixing channel (102) of the cross (1) is processed with a conical hole (101), the sealing seat (3) is seated on the conical hole (101), the sealing seat (3) is sealingly connected with the cross (1) through a conical ring surface, the sealing seat (3) and the protective tube (401) are gap fitted through a sealing ring, and the upper surface of the sealing seat (3) abuts against the lower surface of the bearing sleeve (403).

2. The long service life tubing head of claim 1, wherein: The inner hole of the protective tube (401) extends downwardly to a blocking ring (402), the inner hole of the blocking ring (402) is larger than the outer diameter of the suspended tubing, and the outer surfaces of the protective tube (401) and the blocking ring (402) are sprayed with a tungsten carbide coating.

3. The long service life tubing head of claim 1, wherein: The lower side of the protective tube (401) is processed with a ring groove (4011) below the sealing seat (3), the ring groove (4011) is provided with an axle blocking ring (6) inside, the upper part of the axle blocking ring (6) is provided with a shockproof ring (5), and the shockproof ring (5) is gap fitted between the mixing channel (102) and the protective tube (401).

4. The long service life tubing head of claim 1, wherein: The inner hole of the mixing channel (102) of the cross (1) is sprayed with a tungsten carbide coating.

5. The long service life tubing head of claim 2, wherein: The blocking ring (402) extends downwardly to a flow guide sleeve (4021), and the outer circle of the flow guide sleeve (4021) is conical in shape and large at the upper part and small at the lower part.

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