Novel tubing hanger

Abstract

A novel tubing hanger relates to the technical field of oil extraction wellheads. Connecting oil pipe threads are machined at the lower end of the hanging core pipe, ACME threads are machined at the upper end of the hanging core pipe, a protruding step shaft is arranged in the middle of the hanging core pipe, an upper pressing sleeve is sleeved on the upper portion of the step shaft, a lower pressing sleeve is sleeved on the lower portion of the step shaft, and the upper pressing sleeve and the lower pressing sleeve are connected through a bolt. The oil pipe hanger has the advantages that the oil pipe hanger is divided into the hanging core pipe, the upper pressing sleeve and the lower pressing sleeve, when the oil pipe hanger is installed, the compression spring between the upper pressing sleeve and the lower pressing sleeve is compressed to be larger than the total weight of a hanging oil pipe, then the positioning jackscrew is screwed, and due to the fact that the upper pressing sleeve, the lower pressing sleeve and the hanging core pipe are in flexible connection, the oil pipe hanger is not damaged during underground operation. And even if the suspended core pipe vibrates, the pressure between the sealing seat and the tubing head four-way joint cannot be influenced, and the sealing performance is reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil well head technical field especially relates to a novel tubing hanger. BACKGROUND

[0002] The tubing hanger is a device for supporting the tubing column and sealing the annular space between the tubing and the casing, and the tubing hanger sealing mode utilizes the tubing gravity to connect the tubing hanger with the tubing, the tubing hanger presses the sealing seat, the sealing seat is seated in the cone body of the tubing head four-way joint to seal, and the upper part of the tubing hanger is limited by the positioning top wire (as shown in the drawing), which is convenient to operate, fast in wellhead replacement, and safe, so it is a commonly used mode for medium-deep wells and conventional wells, but the mode has the following problems: when fracturing, perforating, and blowout operations are carried out at the well bottom, the tubing will vibrate up and down, and the tubing hanger connected with the tubing will also vibrate, thereby causing the sealing surface pressure to be insufficient to cause leakage. Fig. 1 CONTENT OF THE UTILITY MODEL

[0003] In order to solve the problem of leakage of the tubing head hanger during the downhole operation, the utility model provides a novel tubing hanger.

[0004] The utility model provides a technical scheme: a novel tubing hanger, which comprises a suspension core pipe, the lower end of the suspension core pipe is provided with a threaded connection for an oil pipe, and the upper end is provided with an ACME thread, a stepped shaft with a protrusion is arranged in the middle of the suspension core pipe, an upper pressing sleeve is sleeved on the upper part of the stepped shaft, and a lower pressing sleeve is sleeved on the lower part of the stepped shaft; the upper pressing sleeve and the lower pressing sleeve are connected through bolts;

[0005] An upper pressing sleeve is provided with a pressure-bearing shoulder on the outer circle, and the inner hole of the upper pressing sleeve is provided with a first stepped hole, a second stepped hole, and a third stepped hole from top to bottom; the diameters of the first stepped hole, the second stepped hole, and the third stepped hole are gradually increased; the lower pressing sleeve comprises a flange disc at the lower part, the upper part of the flange disc is provided with a positioning pipe, the inner hole of the positioning pipe is a fifth stepped hole, and the lower part of the fifth stepped hole is a fourth stepped hole with a reduced diameter;

[0006] A compression spring A is arranged between the upper end surface of the third stepped hole of the upper pressing sleeve and the flange disc of the lower pressing sleeve, the first stepped hole of the upper pressing sleeve is in clearance fit with the suspension core pipe, the second stepped hole of the upper pressing sleeve is in clearance fit with the stepped shaft, the fourth stepped hole of the lower pressing sleeve is in clearance fit with the suspension core pipe, and the fifth stepped hole of the lower pressing sleeve is in clearance fit with the stepped shaft.

[0007] A compression spring B is arranged between the lower end surface of the fifth stepped hole of the lower pressing sleeve and the stepped shaft, and a distance is left between the upper end surface of the second stepped hole of the upper pressing sleeve and the stepped shaft.

[0008] A through hole is formed in the flange disc of the lower pressing sleeve to accommodate the bolt rod of the bolt, and a sixth stepped hole is formed on the lower side of the through hole to accommodate the bolt head of the bolt.

[0009] ​The utility model discloses beneficial effect is: the oil pipe hanger is decomposed into the suspension core pipe, upper pressure cover and lower pressure cover, when installing, the compression spring A between upper pressure cover and lower pressure cover is compressed to be greater than the total weight of the suspension oil pipe, then the positioning top silk is screwed, and the positioning top silk is pressed in the pressure bearing shoulder head and makes the sealing seat positioning, the sealing seat and the oil pipe head four -way always keep the pre -tightening pressure, because the upper pressure cover, lower pressure cover and suspension core pipe are the soft connection, when the downhole operation, even if the suspension core pipe produces the vibration, will not influence the pressure between sealing seat and oil pipe head four -way, and the sealing performance is reliable. BRIEF DESCRIPTION OF DRAWINGS

[0010] BRIEF DESCRIPTION OF DRAWINGS Fig. 1 It is the structural schematic diagram of prior oil pipe hanger;

[0011] BRIEF DESCRIPTION OF DRAWINGS Fig. 2 It is the structural schematic diagram of the utility model;

[0012] BRIEF DESCRIPTION OF DRAWINGS Fig. 3 It is the installation drawing of the utility model;

[0013] BRIEF DESCRIPTION OF DRAWINGS Fig. 4 It is the structural schematic diagram of upper pressure cover in the utility model;

[0014] BRIEF DESCRIPTION OF DRAWINGS Fig. 5 It is the structural schematic diagram of lower pressure cover in the utility model.

[0015] In the drawing, 1-oil pipe head four -way, 2-oil pipe hanger, 3-positioning top silk, 4-sealing seat, 5-suspension core pipe, 501-step shaft, 6-upper pressure cover, 601-pressure bearing shoulder head, 602-first step hole, 603-second step hole, 604-third step hole, 7-lower pressure cover, 701-fourth step hole, 702-positioning pipe, 703-flange plate, 704-fifth step hole, 705-sixth step hole, 706-through hole, 8-bolt, 9-compression spring A, 10-compression spring B. DETAILED DESCRIPTION

[0016] As Figs. 1-5 Shown, a kind of new oil pipe hanger, including suspension core pipe 5, the suspension core pipe 5 lower end is processed with connection oil pipe thread, upper end is processed with ACME thread, suspension core pipe 5 middle part is equipped with a section of protruding step shaft 501, step shaft 501 upper portion is covered with upper pressure cover 6, step shaft 501 lower portion is covered with lower pressure cover 7, upper pressure cover 6 and lower pressure cover 7 are connected by bolt 8;

[0017] The upper pressing sleeve 6 is provided with a pressure bearing shoulder 601 on the outer circle. The inner hole of the upper pressing sleeve 6 is provided with a first stepped hole 602, a second stepped hole 603 and a third stepped hole 604 from top to bottom. The diameters of the first stepped hole 602, the second stepped hole 603 and the third stepped hole 604 are gradually increased. The lower pressing sleeve 7 includes a flange 703. The upper part of the flange 703 is provided with a positioning tube 702. The inner hole of the positioning tube 702 is a fifth stepped hole 704. The lower part of the fifth stepped hole 704 is a fourth stepped hole 701 with a reduced diameter.

[0018] The compression spring A9 is installed between the upper end surface of the third stepped hole 604 of the upper pressing sleeve 6 and the flange 703 of the lower pressing sleeve 7. The first stepped hole 602 of the upper pressing sleeve 6 is in clearance fit with the suspension core tube 5. The second stepped hole 603 of the upper pressing sleeve 6 is in clearance fit with the stepped shaft 501. The fourth stepped hole 701 of the lower pressing sleeve 7 is in clearance fit with the suspension core tube 5. The fifth stepped hole 704 of the lower pressing sleeve 7 is in clearance fit with the stepped shaft 501.

[0019] The compression spring B10 is installed between the lower end surface of the fifth stepped hole 704 of the lower pressing sleeve 7 and the stepped shaft 501. The vibration generated by the suspension core tube 5 can be buffered to ensure the sealing effect of the sealing seat 4. A distance is left between the upper end surface of the second stepped hole 603 of the upper pressing sleeve 6 and the stepped shaft 501.

[0020] The tubing hanger 2 is divided into the suspension core tube 5, the upper pressing sleeve 6 and the lower pressing sleeve 7. When installed, the compression spring A9 between the upper pressing sleeve 6 and the lower pressing sleeve 7 is compressed to be greater than the total weight of the suspended tubing. Then, the positioning top screw 3 is tightened. The positioning top screw 3 is pressed on the pressure bearing shoulder 601 to position the sealing seat 4. The sealing seat 4 and the tubing head cross 1 always maintain a pre-tightening pressure. Since the upper pressing sleeve 6, the lower pressing sleeve 7 and the suspension core tube 5 are soft connected, even if the suspension core tube 5 vibrates during downhole operation, the pressure between the sealing seat 4 and the tubing head cross 1 will not be affected. The sealing performance is reliable.

[0021] The flange 703 of the lower pressing sleeve 7 is processed with a through hole 706 for accommodating the bolt rod of the bolt 8. The lower side of the through hole 706 is processed with a sixth stepped hole 705 for accommodating the bolt head of the bolt 8. After the compression spring A is compressed, the bolt head of the bolt 8 does not leak out of the lower end surface of the flange 703.

Claims

1. A new type of tubing hanger comprising a hanger mandrel (5) characterized in that: The lower end of the suspension core pipe (5) is provided with a connecting oil pipe thread, and the upper end is provided with an ACME thread. A convex stepped shaft (501) is arranged in the middle of the suspension core pipe (5). An upper pressing sleeve (6) is sleeved on the upper part of the stepped shaft (501), and a lower pressing sleeve (7) is sleeved on the lower part of the stepped shaft (501). The upper pressing sleeve (6) and the lower pressing sleeve (7) are connected through bolts (8). A pressure bearing shoulder (601) is arranged on the outer circle of the upper pressing sleeve (6). A first stepped hole (602), a second stepped hole (603), and a third stepped hole (604) are arranged in the inner hole of the upper pressing sleeve (6) from top to bottom. The diameters of the first stepped hole (602), the second stepped hole (603), and the third stepped hole (604) are gradually increased. The lower pressing sleeve (7) includes a flange (703) at the lower part. A positioning tube (702) is arranged on the upper part of the flange (703). The inner hole of the positioning tube (702) is a fifth stepped hole (704). The lower part of the fifth stepped hole (704) is a fourth stepped hole (701) with a reduced diameter. A compression spring A (9) is arranged between the upper end surface of the third stepped hole (604) of the upper pressing sleeve (6) and the flange (703) of the lower pressing sleeve (7). The first stepped hole (602) of the upper pressing sleeve (6) is in clearance fit with the suspension core pipe (5). The second stepped hole (603) of the upper pressing sleeve (6) is in clearance fit with the stepped shaft (501). The fourth stepped hole (701) of the lower pressing sleeve (7) is in clearance fit with the suspension core pipe (5). The fifth stepped hole (704) of the lower pressing sleeve (7) is in clearance fit with the stepped shaft (501).

2. A new tubing hanger according to claim 1 characterized by: A compression spring B (10) is arranged between the lower end surface of the fifth stepped hole (704) of the lower pressing sleeve (7) and the stepped shaft (501). A distance is left between the upper end surface of the second stepped hole (603) of the upper pressing sleeve (6) and the stepped shaft (501).

3. A new tubing hanger as claimed in claim 1, characterized in that: A through hole (706) is arranged on the flange (703) of the lower pressing sleeve (7) for accommodating the bolt rod of the bolt (8). A sixth stepped hole (705) is arranged on the lower side of the through hole (706) for accommodating the bolt head of the bolt (8).

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