CN218265852U - Oil well system with multi-well interconnected high-pressure well heads - Google Patents

Abstract

The utility model provides an oil well system with high-pressure well head is interconnected to many wells, including the oil well structure, the oil well structure includes sleeve pipe, top casing pipe, pipe sleeve pipe, low-pressure well head and high-pressure well head, and the top casing pipe box is established in the outside of sleeve pipe, and high-pressure well head is fixed in the upper portion of top casing pipe, and pipe sleeve pipe box is established in high-pressure well head and the outside of top casing pipe; a casing hanger is arranged in the surface casing, and the casing is fixedly connected with the casing hanger; the oil recovery converging device is arranged, a plurality of oil recovery outlets are communicated with the oil recovery converging device, and fluids from the oil recovery outlets of the oil well structures can be converged; the plurality of oil extraction outlets are provided with connecting pipes, and the connecting pipes are hermetically connected with the oil extraction confluence devices through fixing flanges; an oil extraction outlet is arranged on the high-pressure wellhead head; the oil well system has simple structure and can reduce the use amount of equipment.

Description

Oil well system with multi-well interconnected high-pressure well heads

Technical Field

The utility model relates to an oil production equipment field, in particular to oil well system with high-pressure well head is interconnected to many wells.

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, the deeper the borehole, the later the need 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, the need 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.

SUMMERY OF THE UTILITY MODEL

In view of this, there is a need to provide a well system having a multi-well interconnected high pressure wellhead that is simple in construction and capable of reducing equipment usage.

In order to solve the technical problem, the utility model provides an oil well system with high-pressure well head is interconnected to many wells, including the oil well structure, the oil well structure includes sleeve pipe, top casing pipe, conduit sleeve pipe, low-pressure well head and high-pressure well head, the low-pressure well head is fixed in the upper portion of conduit sleeve pipe, high-pressure well head is fixed in the upper portion of top casing pipe, and conduit sleeve pipe and low-pressure well head establish in the sleeve pipe and the high-pressure well head outside; 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 oil well structure is provided with a plurality of oil extraction converging devices, and the plurality of oil extraction outlets are communicated with the oil extraction converging devices, so that the fluid from the oil extraction outlets of the oil well structure can be converged; and a plurality of oil extraction outlets are provided with connecting pipes, and the connecting pipes are hermetically connected with the oil extraction confluence device through fixing flanges.

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 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 casing and the inner wall matched with the outer wall of the casing.

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, the first branch valve, the second branch valve and the main valve are all electronic valves, the first branch valve, the second branch valve and the main valve are all provided with a wireless signal transceiver, and the first branch valve, the second branch valve and the main valve are connected with external electronic equipment through the wireless signal transceiver.

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 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.

Preferably, the low-pressure wellhead comprises a first section and a second section, the diameter of the first section is larger than that of the second section, an annular bulge is arranged on the second section, the oil well system further comprises a drilling base plate, and the low-pressure wellhead is fixed on the drilling base plate through the annular bulge; the low-pressure wellhead is fixedly connected with the high-pressure wellhead through the first section, a gap is formed between the second section and the surface casing, and the lower end of the high-pressure wellhead is conical; the oil production tree further comprises a main pipeline, a pressure gauge and a plurality of oil outlet pipes, wherein each oil outlet pipe is connected with two oil outlet valves in series, and the pressure gauge is communicated with the main pipeline.

The utility model discloses a well head system simple structure, can reduce the equipment use amount.

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 dimensions, emphasis instead being placed upon illustrating the principles of the invention.

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

fig. 2 is a schematic sectional structure diagram of a wellhead system according to 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 shoe; 2. a surface casing; 21. a surface layer casing shoe; 3. a catheter sleeve; 4. a low-pressure wellhead head; 41. a first stage; 42. a second stage; 43. an annular projection; 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 recovery 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 present invention, the present 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 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 utility model provides an oil well system with high-pressure well head is interconnected to many wells, including the oil well structure, the oil well structure includes sleeve pipe 1, top casing 27, pipe sleeve 3, low pressure well head 4 and high-pressure well head 5, and low pressure well head 4 is fixed in top casing 2's upper portion, and high-pressure well head 5 fixes on top casing 2's upper portion, and top casing 2 and low pressure well head 4 establish the outside at sleeve pipe 1 and high-pressure well head 5, and high-pressure well head 5's top protrusion is oral in low-pressure well. 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. Still including oil recovery converging device 8, the oil well structure is provided with a plurality ofly, and a plurality of oil recovery export 51 all communicate in oil recovery converging device 8, make the fluid that the oil recovery export 51 of a plurality of oil well structures came out can converge, and the oil gas of a plurality of oil well structures all flows out from same oil recovery reflux unit 8, further saves instrument and material. It is a plurality of oil recovery export 51 is provided with the connecting pipe, and the connecting pipe passes through mounting flange sealing connection with oil recovery collection flow device 8, and it is all more convenient to connect the dismantlement.

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 common wellhead is connected with a Christmas tree, so that fluid flows out of the Christmas tree. The utility model discloses in, it is sealed with well head seal structure 50 for the well head, the oil recovery mouth on the rethread lateral wall makes the fluid flow out, in the practical application installation, is connected with oil recovery converging device more easily. 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 fixed to the surface casing 2 and/or the inner wall of 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 means of a third layer of casing hanger 62. Further, the 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 shoes 111, the lower end of the third layer of casing 12 is provided with a third layer of casing shoes 121, and the second layer of casing shoes 111 and the third layer of casing shoes 121 play roles of backflow prevention and guiding.

In a preferred embodiment, a seal assembly is provided on the casing hanger for sealing the gap between the outer wall of the casing 1 and the inner wall which it cooperates with (the inner wall of the casing or the skin casing).

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 oil recovery junction device 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 collecting device 8 further comprises a drilling base plate 9, wherein 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 part of the drilling base plate, so that 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 the preferred embodiment, the low pressure wellhead 4 comprises a first section 41 and a second section 42 (the first section refers to the upper part of the figure, and the second section refers to the lower part of the figure), the diameter of the first section 41 is larger than that of the second section 42, an annular bulge 43 is arranged on the second section 42, the oil well system further comprises a drilling base plate 9, and the low pressure wellhead 4 is fixed on the drilling base plate 9 through the annular bulge 43; the low-pressure wellhead head 4 is fixedly connected with the high-pressure wellhead head 5 through a first section 41, a gap is formed between a second section 42 and the surface casing 2, and the lower end of the high-pressure wellhead head 5 is conical; still include that production tree 85 includes total pipeline, manometer and multichannel oil pipe, it has two oil outlet valve to establish ties on every way oil pipe, need open two oil outlet valve simultaneously promptly and just can make this way oil pipe produce oil, and the security performance is better, and the manometer is linked together with total pipeline, and the manometer is used for measuring the pressure of total pipeline, specifically, the manometer is for having alarming function's manometer, and in case the pressure exceeds the critical value, can automatic alarm, further improves the security.

The utility model discloses a well head system simple structure, can reduce the equipment use amount.

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 "under," "beneath," and "under" a second feature may be directly under or obliquely under the second 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 (10)

1. An oil well system having a multi-well interconnected high pressure wellhead comprising an oil well structure including a casing, a surface casing, a conductor casing, a low pressure wellhead head secured to an upper portion of the conductor 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 exteriorly 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; an oil extraction outlet is arranged on the high-pressure wellhead head; the oil well structure is provided with a plurality of oil extraction outlets which are all communicated with the oil extraction confluence device, so that the fluids from the oil extraction outlets of the oil well structure can be converged; and the oil extraction outlets are provided with connecting pipes, and the connecting pipes are hermetically connected with the oil extraction confluence device through fixing flanges.

2. A well system having a multi-well interconnected high pressure wellhead as defined in claim 1, wherein the well structure further comprises a wellhead sealing structure, said wellhead sealing structure sealing said high pressure wellhead head; the wellhead sealing structure is a wellhead pressure cap or a Christmas tree.

3. A well system having a multi-well interconnected high-pressure wellhead as claimed in 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. A well system having a multi-well interconnected high pressure wellhead as claimed in 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 hanger is secured to the second layer of casing hanger, the second layer of casing hanger is connected to an inner wall of the surface casing, and the second layer of casing hanger is located inside the conductor 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. A well system having a multi-well interconnected high pressure wellhead as claimed in 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 casing and the inner wall matched with the outer wall of the casing.

6. A well system having a multi-well interconnected high pressure wellhead as claimed in claim 1, wherein the production manifold includes a first branch, a second branch, a main conduit, a first branch valve, a second branch valve and a main valve, the well structure including a first well structure and a second well structure, the first well structure being in communication with the first branch, the second branch being in communication with the second branch valve, both the first branch and the second branch being in communication with the main conduit, the first branch valve being disposed between the first well structure and the main conduit, the second branch valve being disposed between the second well structure and the main conduit, the main valve being disposed on the main conduit.

7. An oil well system having a multi-well interconnected high pressure wellhead as claimed in claim 6, wherein the first branch valve, the second branch valve and the main valve are electronic valves, and wireless signal transceiving devices are disposed on the first branch valve, the second branch valve and the main valve, and the first branch valve, the second branch valve and the main valve are connected to external electronic equipment through the wireless signal transceiving devices.

8. A well system having a multi-well interconnected high pressure wellhead according to claim 7, further comprising a controller and an operation robot, wherein said first branch valve, second branch valve and main valve are connected to said controller, and said controller controls said operation robot to perform a mechanical operation when said wellhead system malfunctions.

9. A well system having a multi-well interconnected high pressure wellhead as defined in claim 7, wherein said production manifold further comprises a production manifold in communication with said manifold, said manifold valve operable to control fluid flow to said 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.

10. A well system having a multi-well interconnected high pressure wellhead as defined in claim 1, wherein the low pressure wellhead comprises a first section and a second section, the first section having a diameter greater than the second section, the second section having an annular projection disposed thereon, the well system further comprising a drilling template, the low pressure wellhead secured to the drilling template by the annular projection; the low-pressure wellhead head is fixedly connected with the high-pressure wellhead head through the first section, a gap is formed between the second section and the surface casing, and the lower end of the high-pressure wellhead head is conical; the oil production tree further comprises a main pipeline, a pressure gauge and a plurality of oil outlet pipes, wherein each oil outlet pipe is connected with two oil outlet valves in series, and the pressure gauge is communicated with the main pipeline.

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