Wellhead device of offshore platform

Abstract

The utility model discloses an offshore platform well head device which comprises a well killing pipeline, a tie-back crude oil pipeline, a lifting pipe, a well head system and a positioning device. The positioning device comprises a first flange connected with a well killing pipeline, a first connecting assembly connected with the first flange, a fixing assembly connected with the first connecting assembly and connected to a rising pipe, a second connecting assembly connected with the fixing assembly, and a second flange connected with the second connecting assembly and connected to a tie-back crude oil pipeline. And the rising pipe is connected with the well head system through a reducing nipple. According to the offshore platform wellhead device, accurate positioning of a tie-back crude oil pipeline and a well killing pipeline can be achieved in the oil well drilling and completion stage when the tie-back crude oil pipeline and the well killing pipeline are tie-back to corresponding manifolds through the positioning device, the requirement for installation accuracy of a Christmas tree is met, and meanwhile the installation efficiency is improved. The assembly, welding, flaw detection and pressure test of a tie-back crude oil pipeline and a well killing pipeline are completed before the Christmas tree is installed, so that the optimization of oil well construction procedures is realized.

Description

Technical Field

[0001] The utility model relates to the field of offshore platforms, in particular to an offshore platform wellhead device. Background Art

[0002] The traditional process of offshore oilfield development from drilling to production mainly has 8 steps (such as Figure 5 ). In the step of connecting the wellhead pipeline, the alignment of the pipeline requires the use of a Christmas tree for positioning, and there is also a method of using a simulated Christmas tree for positioning. Whether it is an actual Christmas tree or a simulated Christmas tree, it fails to complete the positioning and installation of the wellhead pipeline during the drilling and completion stage. The connection of the wellhead pipeline involves flange positioning, alignment welding, cooling flaw detection, and pressure testing, etc., which generally takes about 36 hours. The actual pipeline connection process is also affected by intermittent operations, avoiding cross operations, and operation rework. After the installation of the Christmas tree, it generally takes a longer time to put into production. Currently, there is a lack of a device that can position the flange during the connection of the wellhead pipeline to complete the alignment, welding, flaw detection, and pressure testing of the production return and kill lines before the installation of the Christmas tree and meet the accuracy requirements during the installation of the Christmas tree. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an offshore platform wellhead device.

[0004] The technical solution adopted by the utility model to solve its technical problem is: to construct an offshore platform wellhead device, which includes a kill line, a production return pipeline, a riser pipe, a wellhead system, and a positioning device;

[0005] The positioning device includes a first flange connected to the kill line, a first connection component connected to the first flange, a fixing component connected to the first connection component and connected to the riser pipe, a second connection component connected to the fixing component, and a second flange connected to the second connection component and connected to the production return pipeline;

[0006] The riser pipe is connected to the wellhead system through a reducing nipple.

[0007] In some embodiments, the first connection component includes a connecting member connected to the first flange, a first vertical connecting arm connected to the connecting member, and a first horizontal connecting arm connected to the first vertical connecting arm and connected to the fixing component.

[0008] In some embodiments, the second connection component includes a second vertical connecting arm connected to the second flange, and a second horizontal connecting arm connected to the second vertical connecting arm and connected to the fixing component.

[0009] In some embodiments, the profiles of the first vertical connecting arm, the first horizontal connecting arm, the second vertical connecting arm, and the second horizontal connecting arm are round tubes, square steels, angle steels, or I-beams.

[0010] In some embodiments, the fixing assembly includes a first clamping member and a second clamping member that are butt-jointed to each other;

[0011] The first clamping member is connected to the first horizontal connecting arm, and the second clamping member is connected to the second horizontal connecting arm.

[0012] In some embodiments, the profiles of the first clamping member and the second clamping member are iron plates, square steels, angle steels, or I-beams.

[0013] In some embodiments, the first clamping member and the second clamping member are connected together by a plurality of fasteners.

[0014] In some embodiments, the plurality of fasteners are arranged at intervals along the height direction of the riser pipe.

[0015] In some embodiments, the offshore platform wellhead device further includes a measurement assembly, and the measurement assembly includes a fixing member connected to the second horizontal connecting arm and an azimuth and distance measuring instrument installed on the fixing member.

[0016] In some embodiments, the fixing member is an installation guide rail or a fixing clip.

[0017] Implementing the present invention has the following beneficial effects: Through the setting of the positioning device, the offshore platform wellhead device can achieve precise positioning of the crude oil pipeline and the kill line when they are connected back to the corresponding manifolds during the completion stage of the oil well drilling. While meeting the installation accuracy requirements of the Christmas tree, the crude oil pipeline and the kill line can be assembled, welded, inspected for flaws, and pressure tested before the installation of the Christmas tree, thereby optimizing the oil well construction process. Through this positioning device, the process can be optimized, and the purpose of shortening the oil well construction cycle and improving the oil well production efficiency can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present invention, the present invention will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0019] Figure 1 is a schematic diagram of the overall structure of the offshore platform wellhead device in some embodiments of the present invention;

[0020] Figure 2 is the front view of the structure of the positioning device in some embodiments of the present utility model;

[0021] Figure 3 is the side view of the structure of the positioning device in some embodiments of the present utility model;

[0022] Figure 4 is the top view of the structure of the positioning device in some embodiments of the present utility model;

[0023] Figure 5 is the traditional process diagram of offshore oilfield development from drilling to production;

[0024] Figure 6 is the process diagram of offshore oilfield development from drilling to production after optimization. Detailed implementation manners

[0025] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the accompanying drawings and are specific orientation structures and operations for the purpose of facilitating the description of the present technical solution, rather than indicating that the indicated devices or elements must have a specific orientation. Therefore, it should not be construed as a limitation of the present utility model.

[0026] It should also be noted that unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. When an element is referred to as being "above" or "below" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Please refer to Figures 1 to 4, which is a wellhead device for an offshore platform in some embodiments of the present utility model. The wellhead device for the offshore platform includes a kill line 1, a tie-back crude oil pipeline 2, a riser 3, a wellhead system 4, and a positioning device 5. The positioning device 5 includes a first flange 51 connected to the kill line 1, a first connection assembly 52 connected to the first flange 51, a fixing assembly 53 connected to the first connection assembly 52 and connected to the riser 3, a second connection assembly 54 connected to the fixing assembly 53, and a second flange 55 connected to the second connection assembly 54 and connected to the tie-back crude oil pipeline 2. The riser 3 is connected to the wellhead system 4 through a reducer nipple 6.

[0028] Understandably, as Figure 5 shown, in the traditional offshore oilfield development process, the process of oil well drilling is before the process of installing the Christmas tree, and the process of tie-back wellhead pipeline is after the process of installing the Christmas tree. After the traditional process of installing the Christmas tree is completed, the accurate positioning and installation of the tie-back crude oil pipeline 2 and the kill line 1 are realized through the flange downstream of the Christmas tree choke. In the traditional process, there is no interface connected to the tie-back crude oil pipeline 2 and the kill line 1 during the well completion stage of the oil well, and early tie-back cannot be realized. The wellhead pipeline tie-back process needs to be carried out after installing the Christmas tree and installing the wellhead cable, and the time from the installation of the Christmas tree to the production is relatively long, which affects the development efficiency of the oil well. Therefore, in this embodiment, a wellhead device for an offshore platform is constructed. Through the setting of the positioning device 5, during the well completion stage of the oil well, when the tie-back crude oil pipeline 2 and the kill line 1 are tied back to the corresponding manifolds, the accurate positioning of the tie-back crude oil pipeline 2 and the kill line 1 can be realized. While meeting the accuracy requirements for the installation of the Christmas tree, the alignment, welding, flaw detection, and pressure testing of the tie-back crude oil pipeline 2 and the kill line 1 are completed before the installation of the Christmas tree, thereby realizing the optimization of the oil well construction process. Through this positioning device 5, the optimization of the process can be realized. The process diagram of the offshore oilfield development from drilling to production after optimization is as Figure 6 shown, and the purpose of shortening the oil well construction cycle and improving the production efficiency of the oil well can be achieved.

[0029] Among them, the wellhead system 4 is the general term for wellhead oil and casing heads of different diameters and various control systems installed on the conductor casing. The kill line 1 is mainly used to pump diesel into the well to prevent the crude oil from solidifying and blocking the tubing before temporarily shutting down the well during the low water cut period of the oil well, and is also used for killing the well to prevent blowout before well workover or sidetracking operations in the later stage of the oil well. In addition, the tie-back crude oil pipeline 2 is arranged along the height direction of the riser 3.

[0030] Further, the first connection component 52 includes a connecting member 523 connected to the first flange 51, a first vertical connecting arm 521 connected to the connecting member 523, and a first horizontal connecting arm 522 connected to the first vertical connecting arm 521 and connected to the fixing component 53. The second connection component 54 includes a second vertical connecting arm 541 connected to the second flange 55, and a second horizontal connecting arm 542 connected to the second vertical connecting arm 541 and connected to the fixing component 53. The connecting member 523 can be a profile connecting member. The first vertical connecting arm 521 and the first horizontal connecting arm 522 can be connected by welding, and the second vertical connecting arm 541 and the second horizontal connecting arm 542 can be connected by welding to enhance the connection strength of the first connection component 52 and the second connection component 54.

[0031] In addition, the profiles used for the first vertical connecting arm 521, the first horizontal connecting arm 522, the second vertical connecting arm 541, and the second horizontal connecting arm 542 are round tubes, square steels, angle steels, or I-beams, and the profiles can be selected according to the actual on-site situation. The first vertical connecting arm 521, the first horizontal connecting arm 522, the second vertical connecting arm 541, and the second horizontal connecting arm 542 can also be made of aluminum alloy materials.

[0032] The fixing component 53 includes a first clamping member 531 and a second clamping member 532 that are butt-jointed with each other. The first clamping member 531 is connected to the first horizontal connecting arm 522, the second clamping member 532 is connected to the second horizontal connecting arm 542, and the first clamping member 531 and the second clamping member 532 are connected together by a plurality of fasteners 533. When the positioning device 5 needs to be installed, the first clamping member 531 and the second clamping member 532 can be first positioned at a suitable height on the riser pipe 3, and then the first clamping member 531 and the second clamping member 532 are locked together by a plurality of fasteners 533 to complete the locking and positioning of the positioning device 5. In this embodiment, the plurality of fasteners 533 are arranged at intervals along the height direction of the riser pipe 3.

[0033] In addition, the profiles used for the first clamping member 531 and the second clamping member 532 are iron plates, square steels, angle steels, or I-beams, and the profiles can be selected according to the actual on-site situation.

[0034] The offshore platform wellhead device further includes a measurement component 7. The measurement component 7 includes a fixing member 71 connected to the second horizontal connecting arm 542, and an azimuth and distance measuring instrument 72 installed on the fixing member 71. The azimuth and distance measuring instrument 72 is used to ensure that the installation azimuth and height of the positioning device 5 match the production tree installed later. The fixing member 71 is an installation guide rail or a fixing clip.

[0035] Understandably, the above embodiments only represent the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, and these all belong to the protection scope of the present utility model; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. An offshore platform wellhead device, characterized in that: It comprises a well-killing pipeline (1), a crude oil return pipeline (2), a riser (3), a wellhead system (4) and a positioning device (5); The positioning device (5) comprises a first flange (51) connected to the well-killing pipeline (1), a first connecting assembly (52) connected to the first flange (51), a fixing assembly (53) connected to the first connecting assembly (52) and connected to the riser (3), a second connecting assembly (54) connected to the fixing assembly (53), and a second flange (55) connected to the second connecting assembly (54) and connected to the crude oil return pipeline (2); The riser (3) is connected to the wellhead system (4) via a reducing nipple (6).

2. The offshore platform wellhead device according to claim 1, characterized in that: The first connecting component (52) comprises a connecting piece (523) connected to the first flange (51), a first vertical connecting arm (521) connected to the connecting piece (523), and a first transverse connecting arm (522) connected to the first vertical connecting arm (521) and connected to the fixing component (53).

3. The offshore platform wellhead device according to claim 2, characterized in that: The second connecting assembly (54) comprises a second vertical connecting arm (541) connected to the second flange (55), and a second transverse connecting arm (542) connected to the second vertical connecting arm (541) and to the fixing assembly (53).

4. The offshore platform wellhead device according to claim 3, characterized in that: The first vertical connecting arm (521), the first transverse connecting arm (522), the second vertical connecting arm (541) and the second transverse connecting arm (542) are made of round tubes, square steels, angle steels or I-beams.

5. The offshore platform wellhead device according to claim 3, characterized in that: The fixing assembly (53) comprises a first clamping member (531) and a second clamping member (532) that are butted against each other; The first clamping member (531) is connected to the first transverse connecting arm (522), and the second clamping member (532) is connected to the second transverse connecting arm (542).

6. The offshore platform wellhead device according to claim 5, characterized in that: The first clamping member (531) and the second clamping member (532) are made of profiles such as iron plates, square steels, angle steels or I-beams.

7. The offshore platform wellhead device according to claim 5, characterized in that: The first clamping member (531) and the second clamping member (532) are connected together via a plurality of fasteners (533).

8. The offshore platform wellhead device according to claim 7, characterized in that: The plurality of fasteners (533) are arranged in a spaced relationship along the height direction of the riser tube (3).

9. The offshore platform wellhead device according to claim 3, characterized in that: The offshore platform wellhead device also includes a measuring assembly (7), which includes a fixing member (71) connected to the second transverse connecting arm (542), and an azimuth and distance measuring instrument (72) installed on the fixing member (71).

10. The offshore platform wellhead device according to claim 9, characterized in that: The fixing member (71) is a mounting rail or a fixing clip.

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