Tubing head with good sealing performance

Abstract

The utility model relates to the technical field of oil field wellhead equipment, in particular to a tubing head with good sealing performance, which comprises a tubing hanger and a tubing head four-way joint, the tubing hanger is connected with the tubing head four-way joint through a sealing mechanism, the sealing mechanism comprises an outer sealing sleeve and an inner sealing sleeve, the outer sealing sleeve is arranged on a bearing boss of the tubing head four-way joint, and the inner sealing sleeve is arranged on the bearing boss. The outer sealing sleeve is in clearance fit with the tubing head four-way joint through a sealing ring, the inner sealing sleeve is sleeved on the lower portion of a bearing sleeve of the tubing hanger, the inner sealing sleeve is in clearance fit with the tubing hanger through a sealing ring, and the inner sealing sleeve and the outer sealing sleeve are in sealing connection through a conical ring face. A metal sealing mode with high sealing pressure is adopted, underground oil gas permeates into the annular grooves in the lower portion of the outer sealing sleeve, the conical sealing face on the upper portion cannot be polluted, the three annular grooves are formed for containing the permeated oil gas, and the sealing effect is improved; and underground oil gas is further prevented from entering the conical sealing surface, and the overall sealing performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield wellhead equipment technical field especially relates to a tubing head with good sealing performance. BACKGROUND

[0002] The tubing hanger is a device for supporting the tubing string and sealing the annular space between the tubing and the casing. The tubing hanger sealing method is to use the gravity of the tubing to seat the tubing hanger and the tubing into the ell cone of the tubing hanger to seal, which is convenient to operate, fast and safe in wellhead replacement. Therefore, it is a commonly used method for medium-deep wells and conventional wells. The existing tubing head sealing adopts a metal hard sealing method, which is prone to sealing failure when the oil and gas at the bottom of the well enter the sealing ring surface. SUMMARY

[0003] In order to solve the problem of easy failure of the tubing head and the tubing hanger sealing, the utility model provides a tubing head with good sealing performance.

[0004] The utility model discloses a tubing head with good sealing performance, which comprises a tubing hanger and a tubing head ell, the tubing hanger and the tubing head ell are connected through a sealing mechanism, the sealing mechanism comprises an outer sealing sleeve and an inner sealing sleeve, the tubing head ell is provided with a load-bearing boss, the outer sealing sleeve is seated on the load-bearing boss of the tubing head ell, the outer sealing sleeve is gap matched with the tubing head ell through a sealing ring, the tubing hanger is provided with a load-bearing sleeve, the inner sealing sleeve is sleeved on the lower part of the load-bearing sleeve of the tubing hanger, the inner sealing sleeve is gap matched with the tubing hanger through a sealing ring, and the inner sealing sleeve and the outer sealing sleeve are connected through a conical ring surface.

[0005] The conical hole of the outer sealing sleeve is provided with three annular grooves arranged in an upper and lower direction.

[0006] The outer sealing sleeve is provided with a straight hole section at the lower part, the outer sealing sleeve is provided with a stepped hole at the lower part of the straight hole section, the stepped hole is gap matched with the tubing hanger, and the annular space formed by the straight hole section of the outer sealing sleeve, the tubing hanger and the inner sealing sleeve is filled with sealing filler.

[0007] The outer sealing sleeve and the inner sealing sleeve are both made of carbon steel, and the inner sealing sleeve is subjected to quenching and tempering treatment.

[0008] The utility model has the advantages that the utility model still adopts the metal sealing form with high sealing pressure, the oil and gas at the bottom of the well seep into the annular groove at the lower part of the outer sealing sleeve, do not pollute the upper conical sealing surface, three annular grooves are arranged to accommodate the seeped oil and gas, the sealing effect is improved, the sealing filler is arranged at the lower part of the conical sealing surface, the oil and gas at the bottom of the well are further blocked from entering the conical sealing surface, and the overall sealing performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1It is the structure schematic diagram of the utility model;

[0010] Fig. 2 It is the structure schematic diagram of the utility model outer sealing sleeve.

[0011] In the drawing, 1 is a tubing head cross, 101 is a bearing boss, 2 is a tubing hanger, 201 is a bearing sleeve, 3 is an outer sealing sleeve, 301 is a conical hole, 302 is a stepped hole, 303 is a ring groove, 304 is a straight hole section, 4 is an inner sealing sleeve, and 5 is a sealing packing. DETAILED DESCRIPTION

[0012] As Figs. 1-2 shown, a tubing head with good sealing performance comprises a tubing hanger 2 and a tubing head cross 1, the tubing hanger 2 and the tubing head cross 1 are connected through a sealing mechanism, the sealing mechanism comprises an outer sealing sleeve 3 and an inner sealing sleeve 4, the tubing head cross 1 is provided with a bearing boss 101, the outer sealing sleeve 3 is seated on the bearing boss 101 of the tubing head cross 1, the outer sealing sleeve 3 is gap matched with the tubing head cross 1 through a sealing ring, the tubing hanger 2 is provided with a bearing sleeve 201, the inner sealing sleeve 4 is sleeved on the lower part of the bearing sleeve 201 of the tubing hanger 2, the inner sealing sleeve 4 is gap matched with the tubing hanger 2 through a sealing ring, and the inner sealing sleeve 4 and the outer sealing sleeve 3 are connected through a conical annular surface.

[0013] The conical hole 301 of the outer sealing sleeve 3 is provided with three ring grooves 303 arranged in an upper and lower manner.

[0014] The outer sealing sleeve 3 is provided with a straight hole section 304 at the lower part, the outer sealing sleeve 3 is provided with a stepped hole 302 at the lower part of the straight hole section 304, the stepped hole 302 is gap matched with the tubing hanger 2, and the straight hole section 304 of the outer sealing sleeve 3, the tubing hanger 2 and the inner sealing sleeve 4 form an annular space filled with a sealing packing 5.

[0015] The utility model still adopts the metal sealing form with high sealing pressure, the oil and gas in the well seep into the lower ring groove 303 and do not pollute the upper conical sealing surface, three ring grooves 303 are arranged to accommodate the seeped oil and gas, the sealing effect is improved, the sealing packing 5 is arranged at the lower part of the conical sealing surface, the oil and gas in the well are further blocked from entering the conical sealing surface, and the overall sealing performance is improved.

[0016] The outer sealing sleeve 3 and the inner sealing sleeve 4 are both made of carbon steel, the inner sealing sleeve 4 is all subjected to quenching and tempering treatment, the hardness of the inner sealing sleeve 4 is greater than that of the outer sealing sleeve 3, under the suspension weight of the tubing, the inner sealing sleeve 4 can force the conical hole 301 of the outer sealing sleeve 3 to closely adhere to the inner sealing sleeve 4 in a micro view under strong pressure, and the sealing effect is better.

Claims

1. A tubing head with good sealing performance, comprising a tubing hanger (2) and a tubing head four-way connector (1), characterized in that: The tubing hanger (2) and the tubing head tee (1) are connected by a sealing mechanism, which includes an outer sealing sleeve (3) and an inner sealing sleeve (4). The tubing head tee (1) is provided with a load-bearing boss (101). The outer sealing sleeve (3) sits on the load-bearing boss (101) of the tubing head tee (1). The outer sealing sleeve (3) and the tubing head tee (1) are fitted with a sealing ring through a gap. The tubing hanger (2) is provided with a load-bearing sleeve (201). The inner sealing sleeve (4) is fitted under the load-bearing sleeve (201) of the tubing hanger (2). The inner sealing sleeve (4) and the tubing hanger (2) are fitted with a sealing ring through a gap. The inner sealing sleeve (4) and the outer sealing sleeve (3) are connected by a conical annular sealing connection.

2. The oil pipe head with good sealing performance according to claim 1, characterized in that: The outer sealing sleeve (3) has three annular grooves (303) arranged vertically in the conical hole (301).

3. The oil pipe head with good sealing performance according to claim 1, characterized in that: The lower part of the outer sealing sleeve (3) is provided with a straight hole section (304). The outer sealing sleeve (3) is provided with a stepped hole (302) at the lower part of the straight hole section (304). The stepped hole (302) is clearance-fitted with the tubing hanger (2). The annulus formed by the straight hole section (304) of the outer sealing sleeve (3), the tubing hanger (2) and the inner sealing sleeve (4) is filled with sealing filler (5).

4. The oil pipe head with good sealing performance according to claim 1, characterized in that: Both the outer sealing sleeve (3) and the inner sealing sleeve (4) are made of carbon steel, and the inner sealing sleeve (4) has undergone quenching and tempering treatment.

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