CN115142808A

CN115142808A - Multi-well interconnected high-pressure wellhead system for drilling template

Info

Publication number: CN115142808A
Application number: CN202110345263.6A
Authority: CN
Inventors: 斯迈·格莱迪奇
Original assignee: Paige Underwater Technology Guangzhou Co ltd
Current assignee: Paige Underwater Technology Guangzhou Co ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-04
Anticipated expiration: 2041-03-31
Also published as: CN115142808B

Abstract

The invention provides a multi-well interconnection high-pressure wellhead system for a drilling template, which comprises an oil well structure, wherein the oil well structure comprises a sleeve, a surface sleeve, a guide pipe sleeve, a low-pressure wellhead head and a high-pressure wellhead head, the surface sleeve is sleeved outside the sleeve, the high-pressure wellhead head is fixed at the upper part of the surface sleeve, and the guide pipe sleeve is sleeved outside the high-pressure wellhead head and the surface sleeve; a casing hanger is arranged in the surface casing, and the casing is fixedly connected with the casing hanger; an oil extraction outlet is arranged on the high-pressure wellhead head; the wellhead system is simple in structure and can reduce the usage amount of equipment.

Description

Multi-well interconnected high-pressure wellhead system for drilling template

Technical Field

The invention relates to the field of oil extraction equipment, in particular to a multi-well interconnection high-pressure wellhead system for a drilling template.

Background

In the prior art, a conventional 18/4 inch wellhead would typically be installed on surface casing having dimensions of 18/8 inch or 20 inch. Such casing does not have the same pressure integrity as the wellhead, as the bore hole is deeper it is then necessary to use a new casing at a higher pressure in the well, and in order for the well to have the same pressure integrity as the high pressure wellhead as described above, it is necessary to tie back the suspension at the high pressure wellhead. This is accomplished between the casing hanger and the wellhead by the use of a casing hanger and associated spacers according to conventional techniques. Thus, the wellhead typically leaves room for three casing hangers and associated pads and equipment. In order to make such a conventional wellhead operable, a number of additional equipment are required, for example: casing hangers, packer assemblies, seal assemblies, wear pads (one, typically three per casing hanger), running tools for casing hangers, universal and full bore casing hanger running tools, running tools for packer assemblies/seal assemblies, running tools for wear pads, milling and flushing tools for packer assemblies/seal assemblies, and a wide range of tools are required.

Disclosure of Invention

Based on this, it is necessary to provide a wellhead system which is simple in structure and can reduce the amount of equipment used.

In order to solve the technical problem, the invention provides a multi-well interconnection high-pressure wellhead system for a drilling template, which comprises an oil well structure, wherein the oil well structure comprises a casing, a surface casing, a conduit casing, a low-pressure wellhead head and a high-pressure wellhead head, the low-pressure wellhead head is fixed on the upper part of the conduit casing, the high-pressure wellhead head is fixed on the upper part of the surface casing, and the conduit casing and the low-pressure wellhead head are arranged outside the casing and the high-pressure wellhead head; a casing hanger is arranged in the surface casing, and the casing is fixedly connected with the casing hanger; and an oil extraction outlet is arranged on the high-pressure wellhead head.

Preferably, the well structure further comprises a wellhead sealing structure that seals the high-pressure wellhead head.

Preferably, the wellhead sealing structure is a wellhead pressure cap or a Christmas tree.

Preferably, the oil production outlet is arranged on a side wall of the high-pressure well head, the casing hanger is fixed on an inner wall of the high-pressure well head, the oil production outlet is located at the upper part of the casing hanger, and the oil production outlet is located at the upper part of the low-pressure well head.

Preferably, the wellbore casing comprises a second layer of casing and a third layer of casing, the casing hanger comprises a second layer of casing hanger and a third layer of casing hanger, the second layer of casing is fixed on the second layer of casing hanger, the second layer of casing hanger is connected with the inner wall of the surface casing, and the second layer of casing hanger is positioned inside the conduit casing and/or the low-pressure wellhead; the third layer of casing is fixed on the third layer of casing hanger, the third layer of casing hanger is connected with the inner wall of the second layer of casing, and the third layer of casing hanger is fixedly connected to the top end of the second layer of casing.

Preferably, the lower end of the surface casing is provided with a surface casing shoe; the lower end of the second layer of sleeve is provided with a second layer of sleeve shoes, and the lower end of the third layer of sleeve is provided with a third layer of sleeve shoes.

Preferably, a sealing assembly is arranged on the casing hanger and used for sealing a gap between the outer wall of the borehole casing and the inner wall matched with the outer wall.

Preferably, the oil well structure is provided with a plurality of oil recovery confluence devices, and the plurality of oil recovery outlets are all communicated with the oil recovery confluence devices, so that the fluids from the oil recovery outlets of the plurality of oil well structures can be converged.

Preferably, the oil recovery confluence device comprises a first branch, a second branch, a main pipeline, a first branch valve, a second branch valve and a main valve, the oil well structure comprises a first oil well structure and a second oil well structure, the first oil well structure is communicated with the first branch, the second branch is communicated with the second branch valve, the first branch and the second branch are communicated with the main pipeline, the first branch valve is arranged between the first oil well structure and the main pipeline, the second branch valve is arranged between the second oil well structure and the main pipeline, and the main valve is arranged on the main pipeline.

Preferably, first branch road valve, second branch road valve and total valve all are the electronic valve, all be provided with wireless signal transceiver on first branch road valve, second branch road valve and the total valve, first branch road valve, second branch road valve and total valve pass through wireless signal transceiver is connected with outside electronic equipment.

Preferably, the wellhead system further comprises a controller and an operating robot, the first branch valve, the second branch valve and the main valve are all connected with the controller, and when the wellhead system breaks down, the controller controls the operating robot to perform mechanical operation.

Preferably, the production manifold further comprises a production manifold, the production manifold is communicated with the main pipeline, and the main valve can control the fluid flowing to the production manifold; the oil extraction confluence device further comprises a drilling base plate, the guide pipe sleeves of the first oil well structure and the second oil well structure are fixed on the drilling base plate, and high-pressure wellhead heads of the first oil well structure and the second oil well structure protrude out of the upper portion of the drilling base plate.

The wellhead system is simple in structure and can reduce the use amount of equipment.

Drawings

The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual size, emphasis instead being placed upon illustrating the subject matter.

FIG. 1 is a schematic cross-sectional view of a well structure according to a preferred embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a wellhead system in accordance with a preferred embodiment of the present invention.

In the figure: 1. a sleeve; 11. a second layer of casing; 111. a second layer of casing shoes; 12. a third layer of sleeve; 121. a third layer of casing shoes; 2. a surface casing; 21. a surface layer casing shoe; 3. a catheter sleeve; 4. a low-pressure wellhead head; 5. a high-pressure wellhead head; 51. an oil recovery outlet; 511. a first production outlet; 512. a second production outlet; 50. a wellhead sealing structure; 6. a casing hanger; 61. a second layer of casing hanger; 62. a third layer of casing hanger; 7. a wellhead sealing structure; 8. an oil recovery confluence device; 81. a first branch valve; 82. a second branch valve; 83. a main valve; 84. a main conduit; 85. an oil production manifold; 9. drilling a base plate; 10. a first well structure; 20. a second well structure; 100. and (4) open hole wells.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present invention provides a multi-well interconnected high pressure wellhead system for a drilling template, comprising an oil well structure, wherein the oil well structure comprises a casing 1, a surface casing 27, a conduit casing 3, a low pressure wellhead 4 and a high pressure wellhead 5, the low pressure wellhead 4 is fixed on the upper part of the surface casing 2, the high pressure wellhead 5 is fixed on the upper part of the surface casing 2, the surface casing 2 and the low pressure wellhead 4 are arranged outside the wellbore casing 1 and the high pressure wellhead 5, and the top end of the high pressure wellhead 5 protrudes out of the low pressure wellhead. Specifically, a cavity is formed between the surface casing 2 and the conduit casing 3 for filling with a substance such as cement for fixing the surface casing 2. A casing hanger 6 is arranged in the surface casing 2, the casing 1 is fixedly connected with the casing hanger 6, and the inner wall of the surface casing 2 is fixedly connected with the casing hanger 6, so that the casing 1 is fixed on the inner wall of the surface casing 2; the high-pressure wellhead head 5 is provided with an oil extraction outlet 51, and the oil extraction outlet 51 is used for fluid to flow out.

In the preferred embodiment, the well structure further comprises a wellhead sealing structure 50, the top of the high pressure wellhead 5 is provided with a wellhead, and the wellhead sealing structure 50 seals the wellhead. In the prior art, a general wellhead is connected with a Christmas tree, so that fluid flows out of the Christmas tree. In the invention, the wellhead is sealed by the wellhead sealing structure 50, and then fluid flows out through the oil extraction port on the side wall, so that the wellhead is more easily connected with the oil extraction confluence device in practical application and installation. Specifically, the production outlet 51 is provided on the side wall of the high-pressure wellhead head 5, the casing hanger is fixed on the inner wall of the high-pressure wellhead head 5, the production outlet 51 is located on the upper portion of the casing hanger, and the production outlet 51 is located on the upper portion of the low-pressure wellhead head 4.

In the preferred embodiment, the wellhead seal structure 50 is a wellhead pressure cap or a tree, although other structures that seal the wellhead are possible.

In the preferred embodiment, casing 1 comprises a second layer of casing 11 and a third layer of casing 12, and casing hanger 6 comprises a second layer of casing hanger 61 and a third layer of casing hanger 62. The second layer of casing 11 is fixed on a second layer of casing hanger 61, the second layer of casing hanger 61 is connected with the inner wall of the surface casing 2, the second layer of casing hanger 61 is positioned inside the conduit casing 3 and/or the low-pressure wellhead head 4, and the inside of the conduit casing 3 means that the projections of the second layer of casing hanger 61 and the conduit casing 3 and/or the low-pressure wellhead head 4 in the horizontal direction are overlapped; the second casing 11 is secured to the inner wall of the surface casing 2 and/or the high pressure wellhead 5 by a second casing hanger 61. The third layer of casing 12 is fixed on the third layer of casing hanger 62, the third layer of casing hanger 62 is connected with the inner wall of the second layer of casing 11, and the third layer of casing hanger 62 is fixedly connected with the top end of the second layer of casing 11, it should be noted that the words "top end" and "lower end" in this application refer to the position of the wellhead system in the use state, and in addition, the top end and the lower end do not have to be the uppermost end and the lowermost end in a strict sense, as long as the positions relatively close to the uppermost end and the lowermost end are within the protection scope of this application. The third layer of casing 12 is fixedly connected to the second layer of casing 11 by a third layer of casing hanger 62. Further, the wellbore casing 1 is provided in plurality, and the outer surface of the casing 1 located at the innermost portion is in contact with the bare wellbore 100.

In the preferred embodiment, the lower end of the surface casing 2 is provided with a surface casing shoe 21; the lower end of the second layer of casing 11 is provided with a second layer of casing shoe 111, the lower end of the third layer of casing 12 is provided with a third layer of casing shoe 121, and the second layer of casing shoe 111 and the third layer of casing shoe 121 play roles of backflow prevention and guiding.

In a preferred embodiment, the casing hanger is provided with a sealing assembly for sealing a gap between the outer wall of the casing 1 and the inner wall of the casing in cooperation therewith (the inner wall of a surface casing or a wellbore casing).

In the preferred embodiment, the oil recovery converging device 8 is further included, the oil well structure is provided with a plurality of oil recovery outlets 51 which are all communicated with the oil recovery converging device 8, so that the fluids from the oil recovery outlets 51 of the oil well structures can be converged, and the oil and gas of the oil well structures all flow out from the same oil recovery converging device, thereby further saving tools and materials.

In a further preferred embodiment, the first well structure 10 is provided with a first production outlet 511, the second well structure 20 is provided with a second production outlet 512, and the first production outlet 511 and the second production outlet 512 are oppositely arranged. The production manifold 8 comprises a first branch, a second branch, a main conduit 84, a first branch valve 81, a second branch valve 82 and a main valve 83. The oil well structure includes a first oil well structure 10 and a second oil well structure 20, the first oil well structure 10 is communicated with a first branch, a second branch is communicated with a second branch valve 82, the first branch and the second branch are communicated with a main pipeline 84, the first branch valve 81 is arranged between the first oil well structure 10 and the main pipeline 84, the second branch valve 82 is arranged between the second oil well structure 20 and the main pipeline 84, and the main valve 83 is arranged on the main pipeline 84. Specifically, the first branch valve 81, the second branch valve 82, and the main valve 83 are all electronic valves, the first branch valve 81, the second branch valve 82, and the main valve 83 are all provided with a wireless signal transceiver, and the first branch valve 81, the second branch valve 82, and the main valve 83 are connected to an external electronic device through the wireless signal transceiver.

In a preferred embodiment, the wellhead system further comprises a controller and an operation robot, the first branch valve, the second branch valve and the main valve 83 are all connected with the controller, and the controller controls the operation robot to perform mechanical operation when the wellhead system fails.

In the preferred embodiment, the manifold assembly 8 further includes a manifold 85, the manifold 85 being in communication with a manifold 84, and a manifold valve 83 operable to control fluid flow to the manifold; the oil recovery junction device 8 further comprises a drilling base plate 9, the conduit casings 3 of the first oil well structure 10 and the second oil well structure 20 are fixed on the drilling base plate 9, and the high-pressure wellhead heads 5 of the first oil well structure and the second oil well structure protrude out of the upper portion of the drilling base plate, namely the high-pressure wellhead heads 5 of the first oil well structure 10 and the second oil well structure 20 are at least partially positioned on the upper surface of the drilling base plate 9.

In this application, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, reference to the description of the terms "preferred embodiment," "yet another embodiment," "other embodiments," or "specific examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A multi-well interconnected high pressure wellhead system for a drilling template comprising an oil well structure including a casing, a surface casing, a conduit casing, a low pressure wellhead head secured to an upper portion of the conduit casing, and a high pressure wellhead head secured to an upper portion of the surface casing, with the surface casing and the low pressure wellhead head disposed externally of the casing and the high pressure wellhead head, with a top end of the high pressure wellhead head projecting beyond the low pressure wellhead head; a casing hanger is arranged in the surface casing, and the casing is fixedly connected with the casing hanger; and an oil extraction outlet is arranged on the high-pressure wellhead head.

2. The system of claim 1, further comprising a wellhead sealing structure that seals the high-pressure wellhead; the wellhead sealing structure is a wellhead pressure cap or a Christmas tree.

3. The multi-well interconnected high pressure wellhead system for a drilling template of claim 2, wherein the production outlet is provided on a sidewall of the high pressure wellhead, the casing hanger is secured to an inner wall of the high pressure wellhead, the production outlet is located on an upper portion of the casing hanger, and the production outlet is located on an upper portion of the low pressure wellhead.

4. The multi-well interconnected high pressure wellhead system for a drilling template of claim 1, wherein the casing comprises a second layer of casing and a third layer of casing, the casing hanger comprises a second layer of casing hanger and a third layer of casing hanger, the second layer of casing is fixed on the second layer of casing hanger, the second layer of casing hanger is connected with the inner wall of the surface casing, and the second layer of casing hanger is located inside the conduit casing and/or the low pressure wellhead; the third layer of casing is fixed on the third layer of casing hanger, the third layer of casing hanger is connected with the inner wall of the second layer of casing, and the third layer of casing hanger is fixedly connected to the top end of the second layer of casing.

5. The interconnected high pressure wellhead system for a drilling template of claim 4, wherein the lower end of the surface casing is provided with a surface casing shoe; the lower end of the second layer of sleeve is provided with a second layer of sleeve shoes, and the lower end of the third layer of sleeve is provided with a third layer of sleeve shoes; and a sealing assembly is arranged on the casing hanger and used for sealing a gap between the outer wall of the borehole casing and the inner wall matched with the outer wall.

6. The system of claim 1, further comprising a production manifold, wherein the well structure is provided with a plurality of production outlets, each of the plurality of production outlets being in communication with the production manifold to enable the fluids from the production outlets of the plurality of well structures to be combined.

7. The system of claim 6, wherein the production manifold comprises a first branch, a second branch, a main conduit, a first branch valve, a second branch valve, and a main valve, wherein the well structure comprises a first well structure and a second well structure, wherein the first well structure is in communication with the first branch, wherein the second branch is in communication with the second branch valve, wherein the first branch and the second branch are both in communication with the main conduit, wherein the first branch valve is disposed between the first well structure and the main conduit, wherein the second branch valve is disposed between the second well structure and the main conduit, and wherein the main valve is disposed on the main conduit.

8. The system of claim 7, wherein the first branch valve, the second branch valve and the main valve are electronic valves, and the first branch valve, the second branch valve and the main valve are provided with wireless signal transceiving devices, and the first branch valve, the second branch valve and the main valve are connected with external electronic equipment through the wireless signal transceiving devices.

9. The interconnected high pressure wellhead system for drilling template as claimed in claim 8 further comprising a controller and an operating robot, said first branch valve, second branch valve and main valve being connected to said controller, said controller controlling said operating robot to perform mechanical operations when said wellhead system fails.

10. The system of claim 8, wherein the production manifold further comprises a production manifold in communication with the manifold, the manifold valve operable to control fluid flow to the production manifold; the oil recovery confluence device further comprises a drilling base plate, the guide pipe sleeves of the first oil well structure and the second oil well structure are fixed on the drilling base plate, and high-pressure wellhead heads of the first oil well structure and the second oil well structure protrude out of the upper portion of the drilling base plate.