CN204703834U - Integrated wellhead column hitch - Google Patents

Abstract

An integrated wellhead pipe string suspension mechanism includes an upper pipe string, a lower pipe string and an inner pipe hanger. The inner pipe hanger is located in the upper pipe string and the lower pipe string, the inner pipe hanger is covered with a clamping sleeve, the inner wall of the clamping sleeve is in contact with the outer wall of the inner pipe hanger, and the lower end of the upper pipe string Both the clamping drive disc and the upper end of the lower pipe string are equipped with a clamping drive disc, and the two clamping drive discs are set on the clamping sleeve through the set inner ring groove. The inner ring grooves of the drive disc are all in contact with the outer wall of the clamping sleeve. The contact surface between the inner ring groove of one clamping drive disc and the clamping sleeve is a wedge-shaped surface, and the other clamps the inner ring groove of the drive disc and the clamping sleeve. A limit mechanism is set between them. Integrated wellhead string suspension mechanism The clamping drive discs on the upper string and the lower string clamp the inner tube hanger through the drive clamping sleeve, and the clamping drive disc is integrated on the string, which is easy to disassemble.

Description

Integrated Wellhead String Suspension Mechanism

technical field

The utility model relates to the field of oil and gas, in particular to an integrated wellhead pipe string suspension mechanism.

Background technique

In the production operation of oil and gas wells, the conventional practice is to fix the outermost casing on the ground for the tubing or casing that is lowered into the well, and the inner casing is respectively seated into the casing of the casing head and four casings of the casing head. On the shoulder of the spool, tubing head spool or the casing hanger of the outer casing.

However, after cementing, due to changes in downhole temperature and pressure, the axial dimension of the tubing or casing will elongate, and the wellhead string will generate upward thrust. The upward thrust will easily cause the seal failure of the wellhead string hanger, and the hanger will not be able to be completely seated on the shoulder of the wellhead spool, so that the wellhead string and wellhead equipment are in an under-constrained state, resulting in many problems Security risks. During the drilling process, every time a wellhead pipe string of a specification is run, a blowout preventer of a specification must be disassembled and replaced. During the replacement of the blowout preventer, the wellhead is out of control, which increases the operation risk. At the same time, frequent replacement of the blowout preventer causes The operation time increases, so the operation cost is high. The structure of the traditional wellhead string suspension mechanism is relatively complex, the number of parts is large, and the volume is large, so the maintenance of the equipment is cumbersome and complicated, and the cost is high, and it cannot be applied to offshore platforms with limited operating space. The labor intensity of installation and maintenance is high. The time is long and the security risk is high.

Utility model content

The utility model designs an integrated wellhead pipe string suspension mechanism aiming at the deficiencies of the above-mentioned prior art.

The integrated wellhead pipe string suspension mechanism of the utility model includes an upper pipe string, a lower pipe string and an inner pipe hanger.

The inner pipe hanger is located in the upper pipe string and the lower pipe string, the inner pipe hanger is covered with a clamping sleeve, the inner wall of the clamping sleeve is in contact with the outer wall of the inner pipe hanger,

Both the lower end of the upper pipe string and the upper end of the lower pipe string are provided with a clamping drive disc, and the two clamping drive discs are set on the clamping sleeve through the provided inner ring groove, and the two clamping drive discs are connected by a institutions linked,

The inner ring grooves of the two clamping drive discs are in contact with the outer wall of the clamping sleeve. The contact surface between the inner ring groove of one clamping drive disc and the clamping sleeve is a wedge-shaped surface, and the inner ring groove of the other clamping drive disc A limiting mechanism is arranged between the clamping sleeve and the clamping sleeve.

Preferably, the connecting device is a bolt or a hydraulic clamp.

Preferably, the width of the wedge-shaped surface gradually narrows from the middle to the outside.

Preferably, the limiting mechanism includes a limiting groove provided on the outer wall of the clamping sleeve.

Preferably, a sealing ring is installed on the inner wall of the limiting groove.

Preferably, the outer wall of the inner pipe hanger is provided with an annular protrusion, and the width of the annular protrusion is greater than the length of the clamping sleeve.

Preferably, a sealing flange is provided on the surface of the annular protrusion, and a plurality of sealing flanges are axially provided.

The beneficial effect of the utility model is that: the clamping drive disk on the upper pipe string and the lower pipe string of the integrated wellhead pipe string suspension mechanism clamps the inner pipe hanger by driving the clamping sleeve, and the clamping drive disk is integrated on the pipe string, Easy to assemble and disassemble, simple and compact structure, small volume, few parts, convenient operation and maintenance, low maintenance cost, can be applied to dry wells, production wells and self-elevating platforms of offshore oil platforms with limited working space And floating platform wet wellhead, with a wide range of applications.

One clamping drive disc is fixed relative to the clamping sleeve, while the other clamping drive disc generates clamping force through the wedge-shaped surface, so that when the two clamping drive discs move imaginatively, the clamping sleeve can quickly generate clamping force and the fixing effect The production is fast, which is conducive to the disassembly and replacement of the pipe string.

While hanging the pipe string, it also has a sealing effect, which solves the problem of seal failure that is prone to occur in the traditional suspension method, avoids safety hazards in production operations, and does not need to be disassembled and replaced with a specification of the wellhead pipe string every time it is lowered. The injector prevents the wellhead from being out of control, reduces the resulting operating time and operating costs, and ensures operating safety. A sealing ring is installed in the limit groove to ensure the sealing effect of the part of the clamping sleeve that does not generate clamping force.

The ring-shaped protrusion provided on the inner pipe hanger ensures the tightness of its contact with the clamping sleeve, improves the friction force and increases the clamping effect. The width of the ring-shaped protrusion is greater than the length of the clamping sleeve, so that the clamping sleeve can fully contact the ring-shaped protrusion of the inner tube hanger, further improving the friction force and achieving better clamping and sealing effects. The sealing flange provided on the annular protrusion makes the contact surface rougher, improves the friction force, and increases the clamping effect, and meanwhile, the sealing flange also functions as a sealing ring, further improving the sealing performance.

The pipe string suspension adopts the suspension structure without fixed shoulder, so the pipe string suspension position can be properly adjusted and clamped according to the actual operation situation. It is convenient for the installation and operation of the wellhead equipment, and at the same time, it solves the problem that the safety operation of the wellhead is damaged due to the change of the underground geological conditions and the change of the pipe string structure size.

Description of drawings

Accompanying drawing 1 is the cross-sectional structure diagram of the integrated wellhead pipe string suspension mechanism.

Detailed ways

The integrated wellhead pipe string suspension mechanism of the present utility model, as shown in Figure 1, includes an upper pipe string 1, a lower pipe string 2 and an inner pipe hanger 3, the inner pipe hanger 3 is a part that needs to be suspended, and other The pipe string is connected to the inner pipe hanger 3.

The inner pipe hanger 3 is located in the upper pipe string 1 and the lower pipe string 2, and the inner pipe hanger 3 is covered with a clamping sleeve 4, and the inner wall of the clamping sleeve 4 is in contact with the outer wall of the inner pipe hanger 3.

Both the lower end of the upper pipe string 1 and the upper end of the lower pipe string 2 are provided with a clamping drive disc 5, and the two clamping drive discs 5 are set on the clamping sleeve 4 through the provided inner ring groove 6, and the two clamping drive discs 5 They are connected by bolts 7, hydraulic clamps, etc., which can realize connection and fastening.

The inner ring grooves 6 of the two clamping drive discs 5 are in contact with the outer wall of the clamping sleeve 4 .

The contact surface between the inner ring groove 6 that clamps the driving disc 5 and the clamping sleeve 4 is a wedge-shaped surface, and the width of the wedge-shaped surface gradually narrows from the middle to the outside; the other inner ring groove 6 that clamps the driving disc 5 and A limiting mechanism is arranged between the clamping sleeves 4 , and the limiting mechanism includes a limiting groove 8 arranged on the outer wall of the clamping sleeve 4 .

When the bolt 7 is gradually tightened, the two clamping drive discs 5 gradually approach the middle, and one of the clamping drive discs 5 is fixed at a position by the limit groove, so that the other clamping drive disc 5 is relatively close to the clamping sleeve 4. Perform axial movement, squeeze the clamping sleeve 4 through the wedge-shaped surface of the clamping sleeve 4, generate radial clamping force, make the clamping sleeve 4 hold the inner tube hanger 3 tightly, and realize the suspension and fixation of the inner tube hanger 3 .

Due to the radial clamping force generated by the movement of the axis, the clamping drive disc 5 is in close contact with the clamping sleeve 4, which can achieve a sealing effect, while the part of the clamping sleeve 4 provided with the limiting groove 8 has no clamping force , A sealing ring 9 can be installed on the inner wall of the limiting groove 8, which can enhance the sealing effect of this part and ensure the overall sealing performance.

The outer wall of the inner tube hanger 3 is provided with an annular protrusion 10 to increase the tightness of the contact between the inner tube hanger 3 and the clamping sleeve 4 and improve the clamping force. The width of the annular protrusion 10 is greater than the length of the clamping sleeve 4, so that all the inner walls of the clamping sleeve 4 can be in contact with the inner tube hanger 3, increasing the contact area, improving the frictional force, and enhancing the clamping and sealing effect. A sealing flange is arranged on the surface of the annular protrusion 10, and there are several sealing flanges in the axial direction, so that the contact surface is rougher, the friction force is improved, and the clamping effect is increased. At the same time, the sealing flange also acts as a multi-layer sealing ring The effect of further improving the sealing performance.

Claims (7)

1. An integrated wellhead pipe string suspension mechanism, characterized in that it comprises an upper pipe string (1), a lower pipe string (2) and an inner pipe suspension device(3), The inner pipe hanger (3) is located in the upper pipe string (1) and the lower pipe string (2), the inner pipe hanger (3) is covered with a clamping sleeve (4), and the clamping sleeve ( 4) The inner wall is in contact with the outer wall of the inner pipe hanger (3), Both the lower end of the upper pipe string (1) and the upper end of the lower pipe string (2) are provided with a clamping drive disc (5), and the two clamping drive discs (5) are set in the inner ring groove (6) On the clamping sleeve (4), the two clamping drive discs (5) are connected through a connecting mechanism, The inner ring grooves (6) of the two clamping drive discs (5) are in contact with the outer wall of the clamping sleeve (4). The contact surface between them is a wedge-shaped surface, and a limit mechanism is arranged between the inner ring groove (6) of the other clamping drive disc (5) and the clamping sleeve (4). 2. The integrated wellhead string suspension mechanism according to claim 1, characterized in that, the connecting device is a bolt (7) or a hydraulic clamp. 3. The integrated wellhead pipe string suspension mechanism according to claim 1, wherein the width of the wedge-shaped surface gradually narrows from the middle to the outside. 4. The integrated wellhead pipe string suspension mechanism according to claim 1, characterized in that, the limiting mechanism comprises a limiting groove (8) arranged on the outer wall of the clamping sleeve (4). 5. The integrated wellhead pipe string suspension mechanism according to claim 3, characterized in that a sealing ring (9) is installed on the inner wall of the limiting groove (8). 6. The integrated wellhead pipe string suspension mechanism according to claim 1, characterized in that, the outer wall of the inner pipe hanger (3) is provided with an annular protrusion (10), and the annular protrusion (10 ) has a width greater than the length of the clamping sleeve (4). 7. The integrated wellhead pipe string suspension mechanism according to claim 6, characterized in that, a sealing flange is provided on the surface of the annular protrusion (10), and a plurality of sealing flanges are provided axially.