CN115142809A - Multi-well interconnected low pressure wellhead system for drilling template - Google Patents
Multi-well interconnected low pressure wellhead system for drilling template Download PDFInfo
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- CN115142809A CN115142809A CN202110346449.3A CN202110346449A CN115142809A CN 115142809 A CN115142809 A CN 115142809A CN 202110346449 A CN202110346449 A CN 202110346449A CN 115142809 A CN115142809 A CN 115142809A
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- 238000005553 drilling Methods 0.000 title claims abstract description 16
- 239000003129 oil well Substances 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 10
- 241000191291 Abies alba Species 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 55
- 238000011084 recovery Methods 0.000 description 17
- 238000000605 extraction Methods 0.000 description 10
- 239000002344 surface layer Substances 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a multi-well interconnection low-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 low-pressure wellhead head is fixed on the upper part of the surface sleeve, the high-pressure wellhead head is fixed on the upper part of the surface sleeve, the surface sleeve and the low-pressure wellhead head are sleeved outside the sleeve and the high-pressure wellhead head, and the top end of the high-pressure wellhead head protrudes out of the low-pressure wellhead head; the sleeve is connected to the inner wall of the surface sleeve; the oil well structure is provided with a well head and an oil production outlet, the well head is positioned at the top of the high-pressure well head, and the oil production outlet penetrates through the surface casing and the guide pipe casing; the wellhead system is simple in structure and can reduce the usage amount of equipment.
Description
Technical Field
The invention relates to the field of oil extraction equipment, in particular to a multi-well interconnection low-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: the casing hanger, the pack-off assembly, the seal assembly, the wear liner (one, typically three per casing hanger), the running tool for the casing hanger, the universal tool and the full bore casing hanger running tool, the running tool for the pack-off assembly/seal assembly, the running tool for the wear liner, the milling and flushing tools for the pack-off assembly/seal assembly, the tools required being numerous.
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 problems, the invention provides a multi-well interconnected low-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 guide pipe casing, a low-pressure wellhead and a high-pressure wellhead, the low-pressure wellhead is fixed on the upper part of the guide pipe casing, the high-pressure wellhead is fixed on the upper part of the surface casing, the guide pipe casing and the low-pressure wellhead are sleeved outside the casing and the high-pressure wellhead, and the top end of the high-pressure wellhead protrudes out of the low-pressure wellhead; the sleeve is connected to the inner wall of the surface sleeve; the oil well is structurally provided with a well head and an oil extraction outlet, the well head is positioned at the top of the high-pressure well head, and the oil extraction outlet penetrates through the surface casing and the guide pipe casing.
Preferably, the oil extraction outlet is arranged on the side wall of the high-pressure wellhead head, and a high-pressure sealing head is fixedly connected to the oil extraction outlet and is in sealing connection with the oil extraction outlet.
Preferably, the oil extraction outlet is connected with the high-pressure sealing head through a high-pressure metal-to-metal sealing structure.
Preferably, a casing hanger is fixedly connected to the casing, the casing comprises a second layer of casing and a third layer of casing, the second layer of casing is fixed on the second layer of casing hanger, and the second layer of casing hanger is connected with the inner wall of the lower end of the surface casing; the third layer of casing is fixed on the third layer of casing hanger, and the third layer of casing hanger is connected with the inner wall of the lower 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 casing is provided with a second layer casing shoe, and the lower end of the third layer casing is provided with a third layer casing shoe.
Preferably, a casing hanger is fixedly connected to the casing, a sealing assembly is arranged on the casing hanger, and the sealing assembly is 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 wellhead system further comprises a plurality of oil recovery confluence devices, and the oil well structure is provided with a plurality of oil recovery outlets which are all communicated with the oil recovery confluence devices, so that the fluids from the oil recovery outlets of the oil well structure 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 branch, 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 oil well structure comprises a first oil well structure and a second oil well structure, a wellhead sealing structure is arranged on the first oil well structure, the wellhead sealing structure seals the wellhead, and the wellhead sealing structure is a wellhead pressure cap or a first Christmas tree; and the wellhead of the second oil well mechanism is connected with a blowout preventer or a second Christmas tree, and during oil production, the fluids of the first oil well mechanism and the second oil well mechanism flow out through the wellhead of the second oil production mechanism.
The wellhead system disclosed by the invention 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 dimensions, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic partial cross-sectional structural view of a well structure according to a preferred embodiment of the present invention;
FIG. 2 is an overall sectional structural view of a well structure according to a preferred embodiment of the present invention;
fig. 3 is an overall sectional structural schematic view 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; 13. a fourth layer of casing; 131. a fourth 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 extraction outlet; 511. a first production outlet; 512. a second production outlet; 52. a high pressure seal head; 53. a metal-to-metal seal structure; 54. a wellhead; 50. a wellhead sealing structure; 6. a casing hanger; 61. a second layer of casing hanger; 62. a third layer of casing hanger; 63. a fourth layer of casing hanger; 7. a wellhead sealing structure; 8. an oil recovery confluence device; 9. an oil well template; 10. a first well structure; 20. a second well structure; 201. a second tree; 100. and (4) open hole wells.
Detailed Description
To facilitate an understanding of the invention, reference will now be made to the following more complete description taken in conjunction with 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. 1-3, the invention provides a multi-well interconnected low-pressure wellhead system for a drilling template, which comprises an oil well structure, wherein the oil well structure comprises a sleeve 1, a surface sleeve 27, a conduit sleeve 3, a low-pressure wellhead head 4 and a high-pressure wellhead head 5, the low-pressure wellhead head 4 is fixed on the upper part of the conduit sleeve 3, the high-pressure wellhead head 5 is fixed on the upper part of the surface sleeve 2, the conduit sleeve 3 and the low-pressure wellhead head 4 are sleeved outside the sleeve 1 and the high-pressure wellhead head 5, and the top end of the high-pressure wellhead head 5 protrudes out of the low-pressure wellhead head. 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. The sleeve 1 is connected with the inner wall of the surface layer sleeve 2; the well is structurally provided with a wellhead 54 and a production outlet 51, the wellhead 54 is positioned at the top of the high-pressure wellhead head 5, the production outlet 51 penetrates through the surface casing 2 and the conduit casing 3, and the production outlet 51 is used for fluid outflow.
In the preferred embodiment, the oil production outlet 51 is disposed on the sidewall of the high-pressure wellhead head 5, the oil production outlet 51 is fixedly connected with a high-pressure sealing head 52, and the high-pressure sealing head 52 is hermetically connected with the oil production outlet 51. In the prior art, a common wellhead is connected with a Christmas tree, so that fluid flows out of the Christmas tree. In the present invention, the wellhead 54 is sealed by the wellhead sealing structure 50, and then the fluid is flowed out through the oil extraction port 51 on the side wall, so that the oil gas in the oil well structure flows in the directions from A to B to D through the oil extraction outlet 51. In practical installation, the oil recovery junction device 8 is easier to connect. Specifically, the oil recovery outlet 51 is provided on the side wall of the high-pressure wellhead head 5, the casing hanger 6 is fixed on the inner wall of the high-pressure wellhead head 5, the oil recovery outlet 51 is located on the upper portion of the casing hanger 6, and the oil recovery outlet 51 is located on the upper portion of the low-pressure wellhead head 4. Further, the oil recovery outlet 51 and the high pressure seal head 5 are connected by a high pressure metal-to-metal seal 53.
In the preferred embodiment, a casing hanger 6 is fixedly attached to casing 1, 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 the second layer of casing hanger 61, and the second layer of casing hanger 61 is connected with the inner wall of the lower end of the surface layer casing 2; the third layer of casing 12 is fixed on the third layer of casing hanger 121, the third layer of casing hanger 62 is connected with the lower end inner wall of the second layer of casing 11, the second layer of casing 11 is fixedly connected with the surface casing 2 through the first borehole hanger 61, and the third layer of casing 12 is fixedly connected with the second layer of casing 11 through the third layer of casing hanger 62. The casing 1 further comprises a fourth layer of casing 13, the casing hanger 6 comprises a fourth layer of casing hanger 63, the upper end of the fourth layer of casing 13 is connected with the fourth layer of casing hanger 63, and the fourth layer of casing hanger 63 is fixedly connected with the inner wall of the third layer of casing 12 of the casing, so that the fourth layer of casing 13 is fixedly connected with the third layer of casing 12 through the fourth layer of casing hanger 63. This configuration allows multiple casings 1 to be connected end to accommodate wells with deep boreholes. 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 layer casing 2 is provided with a surface layer casing shoe 21; the lower extreme of second layer sleeve pipe 11 is provided with second layer casing shoes 111, and the lower extreme of third layer sleeve pipe 12 is provided with third layer casing shoes 121, and the lower part of fourth layer sleeve pipe 13 sets up fourth layer casing shoes 131, and second layer casing shoes 111, third layer casing shoes 121 and fourth layer casing shoes 131 play the effect of anti-return. In the present application, the terms "top end" and "bottom end" refer to positions in the use state of the wellhead system, and the top end and the bottom end do not have to be the uppermost end and the lowermost end in a strict sense, and positions relatively close to the uppermost end and the lowermost end are within the scope of the present application.
In a preferred embodiment, a casing hanger 6 is fixedly connected to the casing 1, and a sealing assembly is provided on the casing hanger 6 for sealing a gap (a surface casing or an inner wall of the casing) between an outer wall of the casing and an inner wall thereof to be fitted.
In the preferred embodiment, the wellhead system further comprises a plurality of oil recovery confluence devices 8, the oil well structures are provided with a plurality of oil recovery outlets 51 which are all communicated with the oil recovery confluence devices 8, so that the fluids from the oil recovery outlets of the oil well structures can be converged, and the oil and gas of the oil well structures all flow out from the same outlet, thereby further saving tools and materials.
In the 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 disposed. The oil recovery confluence device 8 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 includes first oil well structure 10 and second oil well structure 20, and first oil well structure 10 communicates with first branch road mutually, and the second branch road is linked together with the second branch road valve, and first branch road and second branch road all are linked together with the main pipeline, and first branch road valve sets up between first oil well structure 10 and main pipeline, and the second branch road valve sets up between second oil well structure 20 and main pipeline, and the main valve sets up on the main pipeline. Specifically, 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.
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 preferred embodiment, the wellhead sealing structure of the first well structure 10 is a wellhead pressure cap or a first tree, but may be any other structure that can seal a wellhead. The wellhead of the second oil well mechanism 20 is connected with a blowout preventer or a second Christmas tree 201, and when oil is produced, the fluid of the first oil well mechanism 10 and the fluid of the second oil well mechanism 20 flow out through the wellhead of the second oil production mechanism 20. Referring to fig. 3, in particular, the hydrocarbons in the first well structure 10 flow to the second well structure 20 in the directions a and B, the hydrocarbons in the second well structure 20 flow upward in the direction C, and the hydrocarbons in both the first well structure 10 and the second well structure 20 may flow in the direction D and finally flow out through the second christmas tree 201. Further, the second tree 201 is a tree with a test tree.
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 are all connected with the controller, and when the wellhead system fails, the controller controls the operation robot to perform mechanical operation.
In a preferred embodiment, the oil recovery junction device 8 further comprises an oil well 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 oil well 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 oil well base plate, which means 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 oil well base plate 9.
The wellhead system is simple in structure and can reduce the use amount of equipment.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. 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 (10)
1. A multi-well interconnected low 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 low pressure wellhead head capped on the outside of the casing and high pressure wellhead head, with the top end of the high pressure wellhead head protruding beyond the low pressure wellhead head; the sleeve is connected to the inner wall of the surface sleeve; the oil well is structurally provided with a well mouth and an oil production outlet, the well mouth is positioned at the top of the high-pressure well mouth, and the oil production outlet penetrates through the surface casing and the guide pipe casing.
2. The interconnected multi-well low pressure wellhead system for a drilling template of claim 1, wherein the production outlet is disposed on a sidewall of the high pressure wellhead, the production outlet having a high pressure seal head fixedly attached thereto, the high pressure seal head being sealingly connected to the production outlet.
3. The interconnected multi-well low pressure wellhead system for a drilling template of claim 2, wherein the production outlet and the high pressure seal head are connected by a high pressure metal-to-metal seal.
4. The interconnected multi-well low pressure wellhead system for a drilling template of claim 1, wherein a casing hanger is fixedly attached to the casing, the casing comprising a second layer of casing and a third layer of casing, the second layer of casing being secured to the second layer of casing hanger, and the second layer of casing hanger being connected to the lower inner wall of the surface casing; the third layer of casing is fixed on the third layer of casing hanger, and the third layer of casing hanger is connected with the inner wall of the lower end of the second layer of casing; the lower extreme of top layer sheathed tube is provided with top layer casing shoes, the sheathed tube lower extreme of second layer is provided with second floor casing shoes, the sheathed tube lower extreme of third layer is provided with third layer casing shoes.
5. The multi-well interconnected low pressure wellhead system for the drilling template of claim 1, wherein a casing hanger is fixedly attached to the casing, and wherein a seal assembly is provided on the casing hanger for sealing a gap between an outer wall of the casing and an inner wall cooperating therewith.
6. The interconnected low pressure wellhead system for drilling template as claimed in claim 1 further comprising a production manifold, said well structure being provided with a plurality of said production outlets all communicating with the production manifold to enable the merging of fluids from the production outlets of said plurality of well structures.
7. The interconnected multi-well low pressure wellhead system for a drilling template 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, the well structure comprising a first well structure and a second well structure, the first well structure in communication with the first branch, the second branch in communication with the second branch valve, the first branch and the second branch both in communication with the main conduit, the first branch valve disposed between the first well structure and the main conduit, the second branch valve disposed between the second well structure and the main conduit, the main valve disposed on the main conduit.
8. The interconnected multi-well low pressure wellhead system for the drilling template as claimed in 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 transceiver devices, and the first branch valve, the second branch valve and the main valve are connected with external electronic equipment through the wireless signal transceiver devices.
9. The interconnected multi-well low pressure wellhead system for a drilling template of 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 mechanically operate when said wellhead system fails.
10. The multi-well interconnected low pressure wellhead system for the drilling template of claim 1, wherein the well structure comprises a first well structure and a second well structure, the first well structure having a wellhead sealing structure disposed thereon, the wellhead sealing structure sealing the wellhead, the wellhead sealing structure being a wellhead pressure cap or a first christmas tree; and the wellhead of the second oil well mechanism is connected with a blowout preventer or a second Christmas tree, and during oil production, the fluids of the first oil well mechanism and the second oil well mechanism flow out through the wellhead of the second oil production mechanism.
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| CN202110346449.3A CN115142809B (en) | 2021-03-31 | 2021-03-31 | Multi-well interconnected low pressure wellhead system for drilling base plate |
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| CN202110346449.3A CN115142809B (en) | 2021-03-31 | 2021-03-31 | Multi-well interconnected low pressure wellhead system for drilling base plate |
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| CN115142809B CN115142809B (en) | 2024-06-11 |
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