Well abandoning circulating head convenient to disassemble quickly

Abstract

The utility model discloses a well abandoning circulating head convenient to disassemble quickly, which comprises a circulating head body, a lifting lug is arranged at the top of the circulating head body, and a circulating pipeline interface is arranged at the upper part of the circulating head body; the middle of the circulation head body is sleeved with a hanging lug mounting piece, and the two ends of the hanging lug mounting piece are rotationally connected with hanging lugs. The lower portion of the circulation head body is sleeved with a rubber core, and a guiding shoe is arranged at the bottom of the circulation head body. The well abandoning circulating head does not need to bear high pressure to rapidly build circulation, can be popularized and applied to a plurality of working conditions such as casing grouting, particularly the working conditions that the casing is blocked and rapid grouting is needed in the casing running process, and can achieve large-displacement grouting to buy time for building circulation as soon as possible. The connecting circulating head exhaust pipeline can guide air flow in the casing pipe to return to the turntable surface, so that the efficiency and the safety coefficient in the grouting process are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore oil drilling, in particular to an abandoned well circulation head which is convenient for rapid disassembly. Background Art

[0002] More than 100 exploration wells are drilled in Bohai Sea every year, all of which need to be abandoned. At the same time, some offshore oil and gas fields have entered the middle and late stages of development. More and more oil fields need to abandon oil and gas wells. Abandoning wells is the last step in abandoning wellbores and is an indispensable procedure in the process of oil and gas exploration and development. Cement plugging is the main way of abandonment. The circulation head is a tool that must be used in the cementing process, but there are problems such as complex procedures and great hidden dangers. The commonly used circulation head at sea consists of a flexible elbow, a union joint, and a drill pipe circulation head. After each cement plug is injected, the union joint needs to be unfastened first, and then the circulation head is unfastened. This process is time-consuming and there is a risk of sticking of the drill tool. At the same time, due to factors such as high bottom hole temperature, there is a risk of cement solidification during the removal of the cement head. Therefore, during on-site operations, it is often necessary to "rush to unload" the circulation head, use a hammer to smash the union, and hoist the circulation head. The operation time is low and the safety risk is high. Utility Model Content

[0003] In order to solve the technical problems of the existing circulation head having many components, complex installation and long time consumption, the utility model provides a well abandonment circulation head which is easy to quickly disassemble, and realizes convenient and efficient installation and disassembly while ensuring overall safety and reliability, thereby greatly improving operating efficiency.

[0004] The utility model is realized by adopting the following technical solutions.

[0005] A well abandonment circulation head which is easy to disassemble quickly comprises a circulation head body, a lifting lug is arranged on the top of the circulation head body, and a circulation pipeline interface is arranged on the upper part of the circulation head body; a hanging lug mounting piece is sleeved and installed in the middle part of the circulation head body, and both ends of the hanging lug mounting piece are rotatably connected to the hanging lug; a rubber core is sleeved on the lower part of the circulation head body, and a guide shoe is arranged on the bottom of the circulation head body.

[0006] Furthermore, two ends of the hanging ear mounting member form a hole frame, and the hanging ear is connected to the hole frame through a connecting shaft and a connecting pin.

[0007] Furthermore, the hanging ear comprises a straight rod portion, and the lower end of the straight rod portion is connected to the claw via a curved connecting portion.

[0008] Furthermore, the outer diameter of the circulation head body matches the inner diameter of the drill pipe.

[0009] Furthermore, the rubber core is divided into multiple models according to different outer diameters, and is used to seal the gap between the circulation head body and the casing or drill pipe.

[0010] The utility model obtains the following beneficial effects.

[0011] 1. The utility model combines the advantages of the casing grouting device and the quick-install cement head, and can achieve "quick installation and quick removal" during the well abandonment process, saving 100-180 minutes (5-9 cement plugs) for each well, 12000-21600 minutes (8.3-15.4 days) for 120 wells, and can save 12.45-23.1 million yuan in costs (calculated based on the comprehensive daily fee of 1.5 million yuan for the drilling ship), thus improving the operation time efficiency;

[0012] 2. The utility model circulation head is convenient and quick to install, which reduces the static time of the drilling tool and can effectively reduce the safety risk of the underground well;

[0013] 3. The utility model reduces the complicated procedures of traditional loading and unloading circulation heads, reduces the operating intensity of workers, and reduces the safety risks caused by loading and unloading circulation heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a structural schematic diagram of the well abandonment circulation head casing of the utility model;

[0016] Figure 3 This is a structural schematic diagram of the well abandonment circulation head drill pipe of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the hanging ear of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the connecting pin of the utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the connecting shaft of the utility model;

[0020] Figure 7 It is a structural schematic diagram of the rubber core of the utility model.

[0021] Among them: 1. Lifting ear; 2. Circulation pipeline interface; 3. Hanging ear; 4. Fixing hole; 5. Pin hole; 6. Circulation head body; 7. Rubber core; 8. Guide shoe; 9. Hanging ear mounting piece; 10. Hole frame; 11. Connecting shaft; 12. Connecting pin; 13. Top drive elevator; 14. Casing; 15. Drill pipe; 16. Exhaust pipe. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be clearly and completely described below through specific implementation methods.

[0023] like Figure 1-7As shown, a well abandonment circulation head that is easy to disassemble quickly includes a circulation head body 6. The circulation head body 6 is the core component of the well abandonment circulation head, and other components are connected to it.

[0024] A lifting lug 1 is provided on the top of the circulating head body 6. The lifting lug 1 is a load-bearing component installed on the top of the circulating head for lifting. The ring buckle forms a stable arc hole with strong rigidity, and the hole diameter can be connected to the top drive elevator 13 through a wire rope.

[0025] The upper part of the circulation head body 6 is connected with a circulation pipeline interface 2, which is arranged on the upper part of the circulation head as a whole, with a certain distance from the lifting ear 1 to reduce buffer corrosion, and is connected to the hollow body with a certain internal pressure resistance strength through threads.

[0026] The middle part of the circulating head body 6 is sleeved with a mounting ear mounting piece 9, and a hole frame 10 is provided at both ends of the ear mounting piece 9, and a plurality of through holes are formed on the hole frame 10. The ear 3 is installed on the hole frame 10, and the two ears 3 are symmetrically arranged. The ear 3 includes a straight rod portion, and the lower end of the straight rod portion forms a curved connecting portion, and the end of the connecting portion is connected to a claw, and the claw is used to buckle with the top drive hanging card 13. A fixing hole 4 is processed at the end of the straight rod portion of the ear 3, and the connecting shaft 11 is penetrated in the fixing hole 4 and the corresponding through hole of the hole frame 10, so as to realize the installation of the ear 3; a pin hole 5 is also processed at the end of the straight rod portion of the ear 3, and the pin hole 5 is arranged on the side of the fixing hole 4 close to the claw, and the connecting pin 12 is inserted into the pin hole 5 and the corresponding through hole on the hole frame 10 for fixing. After the connecting pin 12 is put on, the hanging ear 3 is fixedly hung on the lower end surface of the top drive elevator 13. When disassembling, the pin is pulled out, and the hanging ear 3 can move freely to the upper side under the external force of the elevator, and can be directly lifted as a whole by the air winch without buckling.

[0027] The lower part of the circulation head body 6 is equipped with a rubber core 7, which is divided into multiple models according to different outer diameters, so that the circulation head body 6 can be matched with the casing 14 and the drill rod 15 respectively. Specifically, the outer diameter of the circulation head body 6 matches the inner diameter of the drill rod 15, the circulation head body 6 is directly inserted into the drill rod 15, and the rubber core 7 is embedded and stuck inside the drill rod 15 to seal the gap between the circulation head body 6 and the drill rod 15. When the circulation head body 6 is inserted into the casing 14, a rubber core 7 with a larger outer diameter is selected, which can also seal the gap between the circulation head body 6 and the casing 14. In addition, since the inner diameter of the casing 14 is large, the annulus between the circulation head body 6 and the casing 14 is large, so the present application sets a through exhaust hole on the ear mounting member 9, and the exhaust hole is connected to the exhaust pipe 16 to discharge the gas in the annulus and facilitate the injection of liquid.

[0028] The bottom of the circulation head body 6 is provided with a guide shoe 8, which is made of wear-resistant metal material, and has a plurality of through flow measuring grooves fixedly opened on the side.

[0029] During the assembly process of the utility model, the circulation head body 6 can be directly inserted into the drill pipe 15 or the casing 14, and sealed by the rubber core 7. The hanging ear 3 is naturally released and interlocked with the top drive elevator 13. The hanging ear 3 is fixed to the lower end surface of the top drive elevator 13 by means of a through pin. When disassembling, the through pin is pulled out, the hanging ear 3 is pulled up, and the whole is directly lifted by a pneumatic winch.

[0030] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A well abandonment circulation head that is easy to disassemble quickly, characterized in that: The invention comprises a circulation head body (6), the top of which is provided with a hanging ear (1), and the upper part of which is provided with a circulation pipeline interface (2); a hanging ear mounting member (9) is sleeved and installed in the middle part of the circulation head body (6), and both ends of the hanging ear mounting member (9) are rotatably connected to the hanging ear (3); a rubber core (7) is sleeved on the lower part of the circulation head body (6), and a guide shoe (8) is provided on the bottom of the circulation head body (6).

2. The well abandonment circulation head that is easy to disassemble quickly according to claim 1, characterized in that: The two ends of the hanging ear mounting member (9) form a hole frame (10), and the hanging ear (3) is connected to the hole frame (10) through a connecting shaft (11) and a connecting pin (12).

3. The well abandonment circulation head that is easy to disassemble quickly according to claim 1 is characterized in that: The hanging ear (3) comprises a straight rod portion, and the lower end of the straight rod portion is connected to the claw via a curved connecting portion.

4. The well abandonment circulation head that is easy to disassemble quickly according to claim 1 is characterized in that: The outer diameter of the circulation head body (6) matches the inner diameter of the drill rod (15).

5. The well abandonment circulation head that is easy to disassemble quickly according to claim 1 is characterized in that: The rubber core (7) is divided into multiple models according to different outer diameters, and is used to seal the gap between the circulation head body (6) and the casing (14) or the drill rod (15).

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