A multi-functional conduit head wellhead device for single barrel multi-well

Abstract

This invention relates to the field of oilfield wellhead equipment, and discloses a multi-functional guide tube head wellhead device for single-tube multi-well applications. The guide tube head body has several well slots inside, within which a mandrel-type casing hanger body is installed. The top of each well slot has a notch, and the upper inner wall has an annular limiting groove. The mandrel-type casing hanger body has limiting pins on its side wings. Adjusting bolts are installed around the lower circumference of the guide tube head body, and the bottom is welded to the riser for a full circumference seal. Support ribs are welded between the guide tube head body and the riser. A quick-connect mud line is located on the side wings of the guide tube head body. A cementing connection device body is installed on the upper part of the mandrel-type casing hanger body, and the cementing connection device body is connected to the mud line. This invention ensures smooth mud flow in and out of the casing cementing system, greatly improving construction efficiency; the overall wellhead device exhibits enhanced stability, reducing operating costs and maintenance difficulty; and is simple, easy to install, and safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of oilfield wellhead equipment, specifically to a multifunctional guide tube head wellhead device for single-tube multi-well applications. Background Technology

[0002] To improve oil and gas extraction efficiency and enhance the utilization of offshore platform space, various oilfields have widely adopted single-tube multi-well technology. During the on-site installation of single-tube multi-well equipment on offshore platforms, after running multiple manhole covers, simultaneous cementing of these covers is required. In this process, the buoyancy generated by the drilling mud can cause the casing to float, significantly increasing the difficulty of the installation. Traditional cementing methods (see...) Figure 11 The process requires connecting the casing from the drilling platform to the upper part of the mandrel hanger, and then injecting mud into the casing, which is cumbersome and affects construction efficiency. In addition, the sealing of the guide tube head and the riser often uses a large-diameter sealing ring, which increases the cost of use and maintenance. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a multifunctional guide pipe head wellhead device for single-tube multi-well applications, the technical solution of which is as follows:

[0004] A multi-functional guide tube head wellhead device for single-tube multi-well applications includes a guide tube head body, a riser, a mandrel-type casing hanger assembly, and a cementing connection device assembly. The mandrel-type casing hanger assembly includes a mandrel-type casing hanger body, and the cementing connection device assembly includes a cementing connection device body. The guide tube head body has several well slots inside, and the mandrel-type casing hanger assembly is installed within each well slot. The top of each well slot has a notch, and the upper inner wall has an annular limiting groove. The mandrel-type casing hanger body has threaded holes on its side wings, through which the limiting groove is fixed by connecting screws. The positioning pin, after being lowered from the notch, rotates into the limiting groove along with the mandrel-type casing hanger body. The lower circumference of the guide tube head body is uniformly provided with threaded holes, through which adjusting bolts are installed. The bottom is fixed and sealed to the riser pipe around the entire circumference. The side wing of the guide tube head body is reserved with a mud back outlet for connecting the quick-install mud pipeline. The lower part of the mandrel-type casing hanger body is installed with a spacer casing through the casing thread, and the upper part is installed with a cementing connection device body through the lifting thread. The cementing connection device body is connected with a mud pipeline connector for connecting the mud pipeline through a connecting short.

[0005] Furthermore, the bottom of the conduit head body is fixed and sealed to the water-sealing pipe by welding.

[0006] Furthermore, a supporting rib is welded between the guide tube head body and the water-sealing pipe.

[0007] Furthermore, the side wing of the catheter head body is provided with a reserved pressure test hole. After the pressure test is completed, a plug is installed at the outer end of the pressure test hole. After the adjustment bolts are removed to complete the adjustment task, a sealing gasket and sealing bolts are installed.

[0008] Furthermore, after the mandrel-type casing hanger body, carrying the limiting pin, is rotated into place, a limiting block is placed at the notch at the top of the well slot.

[0009] Furthermore, the spindle-type sleeve hanger body has four S-seals on both the upper and lower parts.

[0010] Furthermore, the upper end face of the cementing connection device body is provided with two lifting eye screws.

[0011] Furthermore, an O-ring is provided around the upper part of the cementing connection device body.

[0012] Furthermore, when the spacer sleeve is lowered, the lower part of the mandrel-type sleeve hanger assembly is connected to the spacer sleeve, and the upper part is connected to the lifting sleeve through the mandrel-type sleeve hanger delivery tool.

[0013] Furthermore, the mandrel-type sleeve hanger assembly suspends the surface sleeve via a surface sleeve slip hanger situated on its internal step.

[0014] Compared with the prior art, the present invention has the following main advantages:

[0015] 1. This invention connects the mud pipeline to the mud pipeline through the mud pipeline joint of the cementing connection device body and connects the quick-install mud pipeline through the mud reverse outlet reserved on the side wing of the guide head body, ensuring smooth mud entry and exit during cementing of the casing, resulting in significant cementing effect and greatly improving construction efficiency.

[0016] 2. The guide tube head body and the riser pipe of the present invention are sealed by welding, and the stability of the overall wellhead device is improved by adding supporting ribs, thereby reducing the cost of use and maintenance difficulty.

[0017] 3. The present invention, through the combined design of limiting pins, notches, limiting grooves and limiting blocks, makes the installation of the spindle-type sleeve hanger body simple, easy and safe.

[0018] 4. The present invention, through the combined design of adjusting bolts, sealing gaskets and sealing bolts, not only facilitates the adjustment of the position of the guide tube head body to keep it coaxial with the water-proof pipe, but also solves the sealing problem after the adjusting bolts are removed.

[0019] 5. This invention improves the sealing performance of the mandrel casing hanger body and cementing connection device body by combining the design of S-seal and O-ring seals.

[0020] 6. The present invention facilitates the overall hoisting of the cementing connection device assembly by using eye bolts.

[0021] 7. This invention facilitates the suspension of both the placement casing and the surface casing, saving space in the wellhead equipment and improving installation efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the mandrel-type sleeve hanger assembly of the present invention;

[0023] Figure 2 This is a schematic diagram of the cementing connection device assembly of the present invention;

[0024] Figure 3 This is a schematic diagram showing the adjustment of the guide tube head body position, its installation onto the water-proof pipe, and welding.

[0025] Figure 4 This is a schematic diagram showing the installation of sealing bolts after the catheter head body of the present invention has been welded;

[0026] Figure 5 This is a schematic diagram of the quick-install mud pipeline mounted on the side wing of the guide tube head body of the present invention;

[0027] Figure 6 This is a schematic diagram of the mandrel-type sleeve hanger of the present invention;

[0028] Figure 7 This is a top view schematic diagram of the rotating mandrel type sleeve hanger of the present invention;

[0029] Figure 8 This is a schematic diagram of the cementing connection device installed on the mandrel-type casing hanger according to the present invention;

[0030] Figure 9 This is a schematic diagram of the surface sleeve slip hanger installed on the mandrel-type sleeve hanger according to the present invention;

[0031] Figure 10 This is an isometric view of the multifunctional guide tube head wellhead device of the present invention;

[0032] Figure 11 This is a schematic diagram of the installation of a traditional conduit head and a water-proof pipe;

[0033] In the diagram: 1-S seal, 2-Mandrel casing hanger body, 3-Connecting screw, 4-Limiting pin, 5-Mud line connector, 6-Connecting short connector, 7-Lifting eye screw, 8-O-ring seal, 9-Cementing connection device body, 10-Guide head body, 11-Plug, 12-Adjusting bolt, 13-Support rib, 14-Riser, 15-Sealing gasket, 16-Sealing bolt, 17-Quick-install mud line, 18-Lifting casing, 19-Mandrel casing hanger delivery tool, 20-Mandrel casing hanger assembly, 21-Occupying casing, 22-Limiting block, 23-Mud line, 24-Cementing connection device assembly, 25-Surface casing, 26-Surface casing slip hanger, 27-Notch, 28-Lifting thread, 29-Casing thread, 30-Well groove, 31-Limiting groove. Detailed Implementation

[0034] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. Example 1

[0035] See Figures 1 to 10 A multi-functional guide tube head wellhead device for single-tube multi-well applications includes a guide tube head body 10, a riser 14, a mandrel-type casing hanger assembly 20, and a cementing connection device assembly 24. The mandrel-type casing hanger assembly 20 includes a mandrel-type casing hanger body 2, and the cementing connection device assembly 24 includes a cementing connection device body 9. The guide tube head body 10 has several well slots 30 inside, and the mandrel-type casing hanger assembly 20 is installed in each well slot 30. The top of each well slot 30 has a notch 27, and the upper inner wall has an annular limiting groove 31. The mandrel-type casing hanger body 2 has threaded holes on its side wings, through which the limiting groove is fixed by connecting screws 3. Pin 4, the limiting pin 4 is lowered through notch 27 and rotates into the limiting groove 31 with the mandrel-type casing hanger body 2. The lower circumference of the guide head body 10 is uniformly provided with threaded holes and the adjusting bolt 12 is installed therethrough. The bottom is fixed and sealed around the entire circumference with the water riser 14. The side wings of the guide head body 10 are reserved with mud back outlets for connecting the quick-install mud line 17. The lower part of the mandrel-type casing hanger body 2 is equipped with the spacer casing 21 through the casing thread 29, and the upper part is equipped with the cementing connection device body 9 through the lifting thread 28. The cementing connection device body 9 is equipped with the mud line connector 5 for connecting the mud line 23 through the connecting short connector 6. Example 2

[0036] See Figures 1 to 10 A multifunctional guide tube head wellhead device for single-tube multi-wells, based on the technical solution described in Example 1, wherein the bottom of the guide tube head body 10 is fixed and sealed to the riser pipe 14 by welding; a support rib plate 13 is welded between the guide tube head body 10 and the riser pipe 14 to increase stability. Example 3

[0037] See Figures 1 to 10 A multifunctional guide head wellhead device for single-tube multi-wells, based on the technical solution described in Example 1, has a reserved pressure test hole on the side of the guide head body 10. After the pressure test is completed, a plug 11 is installed at the outer end of the pressure test hole. After the adjustment bolt 12 is removed to complete the adjustment task, a sealing gasket 15 and a sealing bolt 16 are installed to ensure reliable sealing. Example 4

[0038] See Figures 1 to 10 A multi-functional guide head wellhead device for single-tube multi-wells, based on the technical solution described in Embodiment 1, wherein after the mandrel-type casing hanger body 2 carrying the limiting pin 4 is rotated into place, a limiting block 22 is placed at the notch 27 at the top of the well slot 30 to prevent the mandrel-type casing hanger body 2 from coming off. Example 5

[0039] See Figures 1 to 10 A multi-functional guide head wellhead device for single-tube multi-wells, based on the technical solution described in Example 1, has four S-seals on the upper and lower parts of the mandrel-type casing hanger body 2. The S-seals have the characteristics of high temperature resistance and corrosion resistance, and can maintain stable performance under high pressure and extreme working conditions. Example 6

[0040] See Figures 1 to 10 A multi-functional guide head wellhead device for single-tube multi-well applications, based on the technical solution described in Example 1, has two lifting eye bolts 7 on the upper end face of the cementing connection device body 9 for easy overall hoisting; and an O-ring seal 8 is provided around the upper part of the cementing connection device body 9 to ensure sealing during installation. Example 7

[0041] See Figures 1 to 10 A multi-functional guide tube head wellhead device for single-tube multi-wells, based on the technical solution described in Embodiment 1, wherein when the occupant casing 21 is lowered, the lower part of the mandrel casing hanger assembly 20 is connected to the occupant casing 21, and the upper part is connected to the lifting casing 18 through the mandrel casing hanger delivery tool 19. Example 8

[0042] See Figures 1 to 10 A multi-functional guide head wellhead device for single-tube multi-wells, based on the technical solution described in Example 1, wherein the mandrel-type casing hanger assembly 20 suspends the surface casing 25 through the surface casing slip hanger 26 located on its internal step.

[0043] To enable those skilled in the art to better understand the present invention, its basic workflow is briefly described below:

[0044] Reference Figure 3First, the guide tube head body 10 is horizontally lifted and placed stably on the riser pipe 14. The plug 11 is installed to the pre-reserved pressure test hole. Adjusting bolts 12 are installed in the evenly distributed threaded holes at the bottom of the guide tube head body 10. The position of the guide tube head body 10 is adjusted to ensure it is coaxial with the riser pipe 14. The bottom of the guide tube head body 10 is then welded to the riser pipe 14 around its circumference, and supporting ribs 13 are welded on. (Refer to...) Figure 11 Compared to traditional methods of installing conduit heads and risers, the use of large-sized sealing rings and grease injection improves installation efficiency and reduces costs. After welding, refer to... Figure 4-5 Remove the adjusting bolt 12 and install the sealing gasket 15 and sealing bolt 16, and install the quick-install mud pipeline 17 on the side of the guide tube head body 10.

[0045] Reference Figure 6 Connect the mandrel-type casing hanger assembly 20 to the occupant casing 21, then connect the lifting casing 18 to the mandrel-type casing hanger delivery tool 19, and then connect the mandrel-type casing hanger assembly 20 to the mandrel-type casing hanger delivery tool 19.

[0046] Reference Figure 7 Slowly lower the spacer cannula 21, ensuring that the limiting pin 4 is aligned with the notch on the catheter head body 10 during the lowering process. After lowering it into place, rotate the mandrel-type cannula hanger assembly 20 90° and place the two limiting blocks 22 into the notch 27 of the catheter head body 10 respectively. Observe the markings A and B on the top of the mandrel-type cannula hanger assembly 20 to determine the rotation angle of the mandrel-type cannula hanger assembly 20.

[0047] Reference Figure 8 After all the berthing casings 21 and mandrel casing hanger assemblies 20 in the well slots 30 have been lowered, the cementing connection device assembly 24 is installed on the mandrel casing hanger assembly 20 and connected to the mud line 23 for cementing operations. The mud and waste fluid generated during the lowering of the berthing casings 21 and the cementing operation are returned to the mud pit through the quick-connect mud line 17 on the side of the guide tube head body 10, greatly saving cementing time and reducing construction difficulty.

[0048] Reference Figure 9 The surface casing 25 is suspended by a surface casing slip hanger 26 located on an internal step of the mandrel-type casing hanger assembly 20, which saves space in the wellhead equipment and improves installation efficiency.

Claims

1. A multi-functional guide pipe head wellhead device for single-tube multi-well systems, comprising a guide pipe head body, a riser, and a mandrel-type casing hanger assembly, characterized in that, It also includes a cementing connection device assembly; the mandrel casing hanger assembly includes a mandrel casing hanger body, and the cementing connection device assembly includes a cementing connection device body; the guide head body has several well slots inside, and the mandrel casing hanger assembly is installed in the well slots. The top of the well slot has a notch, and the upper inner wall has an annular limiting groove. The side wings of the mandrel casing hanger body have threaded holes, and a limiting pin is fixed therethrough by connecting screws. After the limiting pin is lowered through the notch, it rotates into the limiting groove with the mandrel casing hanger body. The lower circumference of the guide head body has evenly distributed threaded holes, and adjusting bolts are installed therethrough. The bottom is fixed and sealed around the entire circumference of the riser. The side wings of the guide head body have reserved mud back outlets for connecting quick-install mud pipelines; the lower part of the mandrel casing hanger body is fitted with a spacer casing through a set casing thread, and the upper part is fitted with a cementing connection device body through a set lifting thread. The cementing connection device body is fitted with a mud pipeline connector for connecting mud pipelines through a connecting short connector.

2. The multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, The bottom of the conduit head body is fixed and sealed to the water-proof pipe by welding.

3. The multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, A supporting rib is welded between the guide tube head body and the water-proof pipe.

4. The multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, The guide tube head body has a reserved pressure test hole on its side. After the pressure test is completed, a plug is installed at the outer end of the pressure test hole. After the adjustment bolt is removed, a sealing gasket and sealing bolt are installed.

5. A multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, After the mandrel-type casing hanger body is rotated into place with the limiting pin, a limiting block is placed at the notch at the top of the well slot.

6. A multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, The spindle-type sleeve hanger body has four S-seals on the upper and lower parts.

7. A multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, The cementing connection device has two lifting eye bolts on its upper end face.

8. A multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, The upper part of the cementing connection device body is provided with an O-ring seal.

9. A multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, When the spacer sleeve is lowered, the lower part of the mandrel-type sleeve hanger assembly is connected to the spacer sleeve, and the upper part is connected to the lifting sleeve through the mandrel-type sleeve hanger delivery tool.

10. A multifunctional guide tube head wellhead device for single-tube multi-well operation according to claim 1, characterized in that, The mandrel-type sleeve hanger assembly suspends the surface sleeve via a surface sleeve slip hanger located on its internal step.

Images