A deflector suitable for offshore natural gas hydrate branch well construction

Abstract

This invention relates to a guide tool, and more particularly to a guide tool suitable for constructing branch wells in offshore natural gas hydrate areas. It provides a guide tool for precisely positioning branch wells in offshore natural gas hydrate areas. The guide tool includes a guide body, etc. The top of the guide body has a tool insertion interface, upper guide grooves on both the front and rear sides of the guide body, lower guide grooves on both the front and rear sides of the guide body, and guide grooves on both the front and rear sides of the bottom of the guide body. This invention uses the guide grooves to initially guide the positioning pin, enabling the guide body to achieve initial positioning. Then, the positioning pin is guided by the azimuth pin, causing it to enter the lower guide groove, and then the upper guide groove. After these two positioning operations, precise positioning of the branch well is achieved.

Description

Technical Field

[0001] This invention relates to a guide device, and more particularly to a guide device suitable for well construction of marine natural gas hydrate branch wells. Background Technology

[0002] Natural gas hydrates are hailed as the most promising clean energy source to replace conventional oil and gas resources in the 21st century. They are widely distributed in the coastal areas. Currently, natural gas hydrate production is carried out using vertical or horizontal well technology. The production of a single well is limited by the area, and offshore operations are risky and costly. Therefore, multi-branch well development has become the best option. However, during the construction of branch wells, the tubing needs to pass through thousands of meters of seawater. Under the influence of ocean currents and waves, the orientation of the drill string cannot be accurately determined, which may result in the drill string failing to enter the pre-set branch wellbore, affecting the smooth progress of the well construction work.

[0003] Therefore, we are now developing a guide vane that can accurately locate branch wells and is suitable for constructing branch wells in marine natural gas hydrate areas. Summary of the Invention

[0004] In order to overcome the shortcomings of existing devices in accurately locating branch wellbores during drilling and well construction, the technical problem of the present invention is to provide a guide vane suitable for well construction of marine natural gas hydrate branch wells that can accurately locate branch wellbores.

[0005] The technical implementation of the present invention is as follows: a guide for constructing branch wells of natural gas hydrates in marine areas, comprising a guide body, an input tool interface on the top of the guide body, upper guide grooves on both the front and rear sides of the guide body, lower guide grooves on both the front and rear sides of the guide body, the upper guide grooves and the lower guide grooves being interconnected, and the lower guide grooves being located above the upper guide grooves, and guide grooves on both the front and rear sides of the bottom of the guide body.

[0006] Furthermore, it also includes directional pins, with directional pins rotatably connected to both the front and rear sides of the guide body.

[0007] Furthermore, it also includes positioning pins, with positioning pins slidably connected between the upper guide groove, lower guide groove, and guide groove, and the positioning pins are installed on the branch pipe.

[0008] Furthermore, it also includes a guide transition tube, which is connected to the bottom of the guide body and is used to guide the drill bit during its descent.

[0009] Furthermore, it also includes a guide tube, with the guide tube connected to the bottom of the guide transition tube.

[0010] Furthermore, the top connection of the guide tube is rounded to prevent the drill bit from getting stuck during the lowering process.

[0011] Furthermore, the guide tube is made of a flexible material, allowing for swing adjustment.

[0012] Furthermore, the connection between the guide tube and the guide transition tube is a smooth connection to avoid the drill bit getting stuck.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention guides the positioning pin for the first time through the guide groove, so that the guide body is positioned for the first time. Then, the positioning pin is guided by the azimuth pin, so that the positioning pin enters the lower guide groove and then enters the upper guide groove. After two positioning operations, the precise positioning of the branch wellbore is achieved.

[0014] 2. This device has a simple structure and is easy to manufacture. At the same time, the device is fixed and guided by positioning pins, which will not cause it to derail due to ocean currents, making it more stable.

[0015] 3. The present invention is used in the same way as conventional drilling tools. When adjusting the direction, the branch well can be selected by rotating the azimuth pin, which is simple and convenient to operate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention.

[0018] Figure 3 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0019] In the above figures: 10: guide body, 11: feed tool interface, 12: upper guide groove, 13: lower guide groove, 14: orientation pin, 15: positioning pin, 16: guide groove, 20: guide transition tube, 30: guide guide tube. Implementation

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] A guide vane suitable for drilling branch wells of natural gas hydrates in offshore areas, such as Figure 1-3As shown, it includes a guide body 10, a tool feed interface 11, an upper guide groove 12, a lower guide groove 13, and a guide groove 16. The top of the guide body 10 has a tool feed interface 11 for installing and connecting a tool. The guide body 10 has upper guide grooves 12 on both the front and rear sides, and lower guide grooves 13 on both the front and rear sides. The upper guide grooves 12 and lower guide grooves 13 are interconnected, and the lower guide grooves 13 are all located above the upper guide grooves 12. The bottom of the guide body 10 has guide grooves 16 on both the front and rear sides. The upper guide grooves 12, lower guide grooves 13, and guide grooves 16 can all perform guiding functions.

[0022] like Figure 2 and Figure 3 As shown, it also includes directional pins 14. The directional pins 14 are rotatably connected to both the front and rear sides of the guide body 10 for reverse conversion.

[0023] like Figure 2 As shown, it also includes a positioning pin 15. The upper guide groove 12, the lower guide groove 13 and the guide groove 16 are all slidably connected with the positioning pin 15. The positioning pin 15 is installed on the branch pipe and is used to guide the position of the guide body 10.

[0024] like Figure 1 and Figure 3 As shown, it also includes a guide transition tube 20. The bottom of the guide body 10 is connected to the guide transition tube 20, which is used to guide the drill bit during the descent process. The top connection part of the guide transition tube 20 is rounded to prevent the drill bit from getting stuck during the descent process.

[0025] like Figure 1 and Figure 3 As shown, it also includes a guide tube 30. The bottom of the guide tube 20 is connected to the guide tube 30. The guide tube 30 is made of soft material and can be adjusted by swinging. It is used to guide the drill bit over a long distance so that the drill bit can quickly reach the branch wellbore. The connection between the guide tube 30 and the guide tube 20 is a smooth connection to avoid the drill bit getting stuck.

[0026] This device can be used to guide the drill bit when constructing branch wells for offshore natural gas and water mixing. It is also suitable for onshore oil and gas well branch well construction, ensuring the drill bit accurately reaches the branch wellbore location for drilling. First, the branch lines (i.e., the guide wires for directional drilling) need to be pre-installed along the well wall. Then, the positioning pins 15 are installed on the branch lines. During installation, the stability of the positioning pins 15 must be ensured. The positioning pins 15 should be installed on the sides of the branch lines that are close to each other, and each should be perpendicular to the plane of the branch center. Next, the feed tool (i.e., the device that propels this device towards the bottom of the well) is connected to the feed tool interface 11, allowing the feed tool to be inserted... The tool can be connected and fixed to the guide body 10. Then, the azimuth pins 14 are rotated according to the direction of the branch wellbore, so that the guide body 10 can face the approximate direction when moving. Next, the position of the guide body 10 is adjusted according to the positioning direction of the branch pipeline, so that the orientation of the guide body 10 is consistent with the azimuth pins 14. Then, the guide body 10 is placed into the well, and the insertion equipment is started. The insertion equipment will push the guide body 10 towards the seabed. To avoid collision between the guide body 10 and the well wall, torque can be released to slow the descent speed of the guide body 10. During this process, the azimuth pins 15 first pass through the guide grooves 16. Under the pressure of the guide grooves 16, the guide body... The main body 10 rotates, causing the guide tube transition pipe 20 and the guide tube guide pipe 30 to move. When the positioning pins 15 all reach the position of the azimuth pins 14, since they are in the same azimuth, the guide body 10 will deflect towards the center plane of the branch wellbore. This causes the guide tube transition pipe 20 to drive the guide tube guide pipe 30 towards the center plane of the branch wellbore. When the feeding equipment pushes the guide body 10 to continue moving downward, the positioning pins 15 will all pass through the azimuth pins 14 and move upward along the lower guide groove 13. As the positioning pins 15 all reach the top of the lower guide groove 13, the guide body 10 will deflect towards the branch wellbore. This causes the guide tube transition pipe 20 to drive the guide tube guide pipe 30 towards the branch wellbore. At this time... The guide body 10 continues to be lowered until all the positioning pins 15 enter the upper guide groove 12, thus allowing the guide tube 30 to formally enter the branch wellbore, completing the positioning work of the branch wellbore. After all work is completed, the control system begins to retrieve the guide body 10, causing it to move upwards to reset. This, in turn, causes the guide transition tube 20 to pull the guide tube 30 upwards to reset. During this process, the positioning pins 15 will move along the upper guide groove 12 into the lower guide groove 13, and then into the guide groove 16. In summary, the guide groove 16 provides the first guidance for the positioning pins 15, enabling the guide body 10 to achieve its first positioning. Subsequently, the azimuth pins 14 provide positional guidance for the positioning pins 15.This allows the positioning pin 15 to enter the lower guide groove 13, and then the upper guide groove 12. After two positioning operations, the branch wellbore is positioned. This device has a simple structure and is easy to manufacture. Furthermore, the positioning pin 15 provides a fixed guide for the device, preventing derailment due to ocean currents and ensuring greater stability.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A guide vane suitable for drilling branch wells of natural gas hydrates in marine areas, characterized in that: It includes a guide body (10), a tool insertion interface (11) on the top of the guide body (10), upper guide grooves (12) on both the front and rear sides of the guide body (10), lower guide grooves (13) on both the front and rear sides of the guide body, the upper guide grooves (12) and the lower guide grooves (13) are connected to each other, and the lower guide grooves (13) are all located above the upper guide grooves (12), and guide grooves (16) on both the front and rear sides of the bottom of the guide body (10). It also includes directional pins (14), and the front and rear sides of the guide body (10) are rotatably connected with directional pins (14); It also includes a positioning pin (15), and the upper guide groove (12), lower guide groove (13) and guide groove (16) are all slidably connected with the positioning pin (15), and the positioning pin (15) is installed on the branch pipe.

2. A guide vane for constructing branch wells of marine natural gas hydrates according to claim 1, characterized in that: It also includes a guide transition tube (20), which is connected to the bottom of the guide body (10) for guiding the drill bit descent process.

3. A guide vane for constructing branch wells of natural gas hydrates in marine areas, as described in claim 2, characterized in that: It also includes a guide tube (30), and the bottom of the guide transition tube (20) is connected to the guide tube (30).

4. A guide vane for constructing branch wells of marine natural gas hydrates according to claim 3, characterized in that: The top connection of the guide transition tube (20) is rounded to prevent the drill bit from getting stuck during the lowering process.

5. A guide vane for constructing branch wells of marine natural gas hydrates according to claim 4, characterized in that: The guide tube (30) is made of a soft material and can be adjusted by swinging.

6. A guide vane for constructing branch wells of natural gas hydrates in marine areas, as described in claim 5, characterized in that: The connection between the guide tube (30) and the guide transition tube (20) is a smooth connection to avoid the drill bit getting stuck.

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