Well cementation cement head for oil exploitation well drilling

Abstract

The utility model discloses a well cementation cement head for oil exploitation well drilling, which comprises a single-plug casing cement head, and the single-plug casing cement head comprises a barrel, a mounting seat, a screw and a turntable; the damage prevention assembly comprises a groove, a connecting pipe, a conical pipe, a through hole, a cylinder, a sealing ring, a first connecting plate and a first spring; the through hole is formed in the side edge of the conical surface of the conical pipe; the cylinder is inserted into the through hole; the sealing ring sleeves the lower end of the cylinder; the first connecting plate is fixed at the lower ends of the cylinder and the sealing ring; the lower end of the first spring is fixed inside the conical pipe. The problems that when a pin rotates, friction is generated between a rubber plug and the contact face of the pin due to the downward gravity of the rubber plug, normal screwing-in and screwing-out of the pin are affected after long-term use, and the service life of the pin is greatly shortened are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cement heads for well cementing, in particular to a cement head for well cementing in oil exploration drilling. Background Technique

[0002] A cement head for well cementing is a component used in the process of oil exploration drilling, mainly used to connect the wellhead and the drill pipe, and inject cement slurry into the borehole to seal the wellbore. Its main functions are to ensure the safety and efficiency of drilling operations, prevent the collapse of the wellbore, prevent groundwater pollution, and protect the oil and gas layers from damage. A rubber plug is placed on the upper section of the cement head for well cementing. Blocked by a pin, when it is necessary to lower the rubber plug, the pin is rotated out of the cylinder body, and the rubber plug drops with the injection of the mud.

[0003] When the pin rotates, due to the downward gravity of the rubber plug, friction will be generated at the contact surface between the rubber plug and the pin. After long-term use, it will affect the normal rotation in and out of the pin, and will also greatly shorten the service life of the pin. Therefore, it is necessary to provide a cement head for well cementing in oil exploration drilling to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a cement head for well cementing in oil exploration drilling to solve the problems raised in the above background technique, that is, when the pin rotates, due to the downward gravity of the rubber plug, friction will be generated at the contact surface between the rubber plug and the pin. After long-term use, it will affect the normal rotation in and out of the pin, and will also greatly shorten the service life of the pin.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model is a cement head for well cementing in oil exploration drilling, including:

[0007] A single-plug casing cement head, which includes a cylinder body, a mounting seat, a screw rod and a turntable;

[0008] The mounting seat is fixed on both sides of the middle section of the cylinder body. The screw rod is screwed inside the mounting seat, and the turntable is fixed at one end of the screw rod;

[0009] An anti-loss component, which includes a groove, a connecting pipe, a tapered pipe, a through hole, a cylinder, a sealing ring, a first connecting plate and a first spring;

[0010] The groove is opened at one end of the screw rod away from the turntable. One end of the connecting pipe is screwed inside the groove, the tapered pipe is screwed at the other end of the connecting pipe, the through hole is opened on the side of the tapered surface of the tapered pipe, the cylinder is inserted into the through hole, the sealing ring is sleeved at the lower end of the cylinder, the first connecting plate is fixed at the lower ends of the cylinder and the sealing ring, the first spring is fixed at the lower end of the first connecting plate, and the lower end of the first spring is fixed inside the tapered pipe.

[0011] Further, there are two cylinders in total, with semi-circular upper ends, which are respectively fixed at both ends of the first connecting plate.

[0012] Further, the single-plug casing cement head further includes a cement head cap and a connection port;

[0013] The cement head cap is screwed to the upper end of the cylinder body, and the connection port is fixed to the lower end of the cylinder body.

[0014] Further, the single-plug casing cement head further includes a first mud inlet and a second mud inlet;

[0015] The first mud inlet and the second mud inlet are fixed to the side of the cylinder body, and are respectively located on the upper and lower sides of the mounting seat.

[0016] Further, a propulsion assembly is further included;

[0017] The propulsion assembly includes a second connecting plate and a second spring;

[0018] The second connecting plate is fixed to one end of the connecting pipe, the second spring is fixed in the middle of the second connecting plate, and the second spring is located inside the connecting pipe.

[0019] Further, the propulsion assembly further includes a movable plug;

[0020] The movable plug is fixed on the second spring, and the movable plug is movably connected inside the tapered pipe.

[0021] Compared with the prior art, the advantages of the present utility model are as follows:

[0022] First, in the present utility model, through the provided anti-wear assembly, one end of the connecting pipe is rotated into the groove, lubricating oil is injected into the tapered pipe, and then the tapered pipe is rotated to the other end of the connecting pipe. By using the tapered pipe, the contact surface with the rubber plug is reduced. When the turntable rotates and drives the screw to rotate, the tapered pipe is driven to rotate, so that the conical surface of the tapered pipe fits and rotates along the bottom surface of the rubber plug. The bottom surface of the rubber plug presses the cylinder to move into the tapered pipe along the through hole, and the lubricating oil in the tapered pipe flows out, so that the contact surface between the tapered pipe and the rubber plug is lubricated. When the cylinder rotates past the contact surface with the rubber plug, the first spring extends, driving the first connecting plate to move, driving the top of the cylinder to move out of the through hole, and the sealing ring fits at the inner through hole of the tapered pipe. This setting can, on the one hand, reduce the contact surface between the rubber plug and the retaining pin and reduce wear, and on the other hand, further reduce wear by adding a lubricant;

[0023] Second, in the present utility model, through the provided propulsion assembly, when the cylinder moves downward along the through hole, the through hole is communicated with the air, the second spring on the second connecting plate extends, driving the movable plug to move into the tapered pipe, and pushing the lubricating oil to flow toward the through hole. This setting enables the lubricating oil to flow out of the through hole better. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the screw rod turning out of the present invention;

[0027] Figure 3 It is a schematic diagram of the connection between the screw rod and the conical tube of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the anti-damage component of the present invention;

[0029] Figure 5 It is a schematic diagram of the inside of the conical tube of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the propulsion component of the present invention.

[0031] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0032] 10. Cylinder body; 11. Cement head cap; 12. First mud inlet; 13. Second mud inlet; 14. Mounting seat; 15. Screw rod; 16. Turntable; 17. Connection port;

[0033] 20. Groove; 21. Connecting pipe; 22. Conical tube; 23. Through hole; 24. Cylinder; 25. Sealing ring; 26. First connecting plate; 27. First spring;

[0034] 30. Second connecting plate; 31. Second spring; 32. Movable plug. Specific embodiments

[0035] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

[0036] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0037] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will further describe the embodiments of the present utility model in detail with reference to the accompanying drawings.

[0038] Please refer to Figures 1-5 As shown, this embodiment is a cement head for oil extraction drilling, including:

[0039] A single-plug casing cement head, which includes a cylinder body 10, a mounting seat 14, a screw rod 15, and a turntable 16;

[0040] The mounting seat 14 is fixed on both sides of the middle section of the cylinder body 10. The screw rod 15 is screwed inside the mounting seat 14, and the turntable 16 is fixed at one end of the screw rod 15;

[0041] The cylinder body 10 serves a supporting and protective role, the mounting seat 14 serves a connecting role, the screw rod 15 serves a connecting role, and the turntable 16 facilitates the operation of the screw rod 15;

[0042] An anti-damage component, which includes a groove 20, a connecting pipe 21, a tapered pipe 22, a through hole 23, a cylinder 24, a sealing ring 25, a first connecting plate 26, and a first spring 27;

[0043] The groove 20 is opened at one end of the screw rod 15 away from the turntable 16. One end of the connecting pipe 21 is screwed inside the groove 20. The tapered pipe 22 is screwed at the other end of the connecting pipe 21. The through hole 23 is opened on the side of the conical surface of the tapered pipe 22. The cylinder 24 is inserted into the through hole 23. The sealing ring 25 is sleeved at the lower end of the cylinder 24. The first connecting plate 26 is fixed at the lower ends of the cylinder 24 and the sealing ring 25. The first spring 27 is fixed at the lower end of the first connecting plate 26, and the lower end of the first spring 27 is fixed inside the tapered pipe 22;

[0044] There are two cylinders 24 in total, and the upper ends are semi-circular, and are respectively fixed at both ends of the first connecting plate 26;

[0045] The groove 20 and the connecting pipe 21 serve a connecting role. The tapered pipe 22 can reduce the contact area with the rubber plug. The through hole 23 facilitates the movement of the cylinder 24 and provides a lubricating oil outflow channel. The cylinder 24 serves a closing role. The sealing ring 25 has a sealing effect. The first connecting plate 26 serves a connecting role. The first spring 27 has an extrusion function;

[0046] The single-plug casing cement head further includes a cement head cap 11 and a connection port 17;

[0047] The cement head cap 11 is screwed on the upper end of the cylinder body 10, and the connection port 17 is fixed at the lower end of the cylinder body 10;

[0048] The cement head cap 11 serves a closing role, and the connection port 17 is used to connect the lower drill pipe;

[0049] The single-plug casing cement head further includes a first mud inlet 12 and a second mud inlet 13;

[0050] The first mud inlet 12 and the second mud inlet 13 are fixed on the side of the cylinder body 10 and are respectively located on the upper and lower sides of the mounting seat 14;

[0051] The first mud inlet 12 and the second mud inlet 13 inject cement twice respectively.

[0052] Working principle:

[0053] Rotate one end of the connecting pipe 21 into the groove 20, inject lubricating oil into the conical pipe 22, and then rotate the conical pipe 22 to the other end of the connecting pipe 21. The conical pipe 22 is adopted to reduce the contact surface with the rubber plug;

[0054] When the turntable 16 rotates and drives the screw 15 to rotate, the conical pipe 22 is driven to rotate, so that the conical surface of the conical pipe 22 fits and rotates along the bottom surface of the rubber plug. The bottom surface of the rubber plug presses the cylinder 24 to move along the through hole 23 into the conical pipe 22, and the lubricating oil in the conical pipe 22 flows out, so that the contact surface between the conical pipe 22 and the rubber plug is lubricated. When the cylinder 24 rotates past the contact surface with the rubber plug, the first spring 27 extends, drives the first connecting plate 26 to move, drives the top end of the cylinder 24 to move out of the through hole 23, and the sealing ring 25 fits at the inner through hole 23 of the conical pipe 22.

[0055] This step can, on the one hand, reduce the contact surface between the rubber plug and the retaining pin and reduce wear, and on the other hand, further reduce wear by adding lubricant.

[0056] Please refer to Figure 6 , on the basis of the above embodiment, this embodiment further includes:

[0057] A propulsion assembly, the propulsion assembly includes a second connecting plate 30 and a second spring 31;

[0058] The second connecting plate 30 is fixed at one end of the connecting pipe 21, the second spring 31 is fixed in the middle of the second connecting plate 30, and the second spring 31 is located inside the connecting pipe 21;

[0059] The second connecting plate 30 plays a fixing role, and the second spring 31 has an extrusion function;

[0060] The propulsion assembly further includes a movable plug 32;

[0061] The movable plug 32 is fixed on the second spring 31 and is movably connected inside the conical pipe 22;

[0062] The movable plug 32 has a pushing function.

[0063] Working principle:

[0064] When the cylinder 24 moves downward along the through hole 23, the through hole 23 is in communication with the air, and the second spring 31 on the second connecting plate 30 extends, driving the movable plug 32 to move into the conical tube 22, and pushing the lubricating oil to flow towards the through hole 23.

[0065] This step enables the lubricating oil to flow out of the through hole 23 better.

[0066] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; 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 components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0067] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cement head for oil extraction drilling, characterized in that Comprising: A single - plug casing cement head, the single - plug casing cement head includes a cylinder body (10), a mounting seat (14), a screw rod (15) and a turntable (16); The mounting seat (14) is fixed on both sides of the middle section of the cylinder body (10), the screw rod (15) is screwed inside the mounting seat (14), and the turntable (16) is fixed at one end of the screw rod (15); An anti - damage component, the anti - damage component includes a groove (20), a connecting pipe (21), a conical pipe (22), a through - hole (23), a cylinder (24), a sealing ring (25), a first connecting plate (26) and a first spring (27); The groove (20) is opened at one end of the screw rod (15) away from the turntable (16), one end of the connecting pipe (21) is screwed in the groove (20), the conical pipe (22) is screwed at the other end of the connecting pipe (21), the through - hole (23) is opened on the side of the conical surface of the conical pipe (22), the cylinder (24) is inserted in the through - hole (23), the sealing ring (25) is sleeved at the lower end of the cylinder (24), the first connecting plate (26) is fixed at the lower ends of the cylinder (24) and the sealing ring (25), the first spring (27) is fixed at the lower end of the first connecting plate (26), and the lower end of the first spring (27) is fixed inside the conical pipe (22).

2. The cement head for well cementing in oil exploration drilling according to claim 1, characterized in that, There are two cylinders (24) in total, the upper ends are semi - circular, and are respectively fixed at both ends of the first connecting plate (26).

3. A cement head for oil exploration drilling according to claim 1, characterized in that, The single - plug casing cement head further includes a cement head cap (11) and a connection port (17); The cement head cap (11) is screwed on the upper end of the cylinder body (10), and the connection port (17) is fixed at the lower end of the cylinder body (10).

4. A cement head for oil extraction drilling according to claim 1, characterized in that, The single - plug casing cement head further includes a first mud inlet (12) and a second mud inlet (13); The first mud inlet (12) and the second mud inlet (13) are fixed on the side of the cylinder body (10), and are respectively located above and below the mounting seat (14).

5. A cement head for oil exploration drilling according to claim 1, wherein, It further includes a propulsion component; The propulsion component includes a second connecting plate (30) and a second spring (31); The second connecting plate (30) is fixed at one end of the connecting pipe (21), the second spring (31) is fixed in the middle of the second connecting plate (30), and the second spring (31) is located inside the connecting pipe (21).

6. The cement head for oil exploration drilling according to claim 5, characterized in that, The propulsion component further includes a movable plug (32); The movable plug (32) is fixed on the second spring (31), and the movable plug (32) is movably connected inside the conical pipe (22).

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