A cementing supporting tool without replacing the core of the well control blowout preventer

Abstract

The present invention discloses a cementing supporting tool that does not require replacement of the well control blowout preventer core, which is mainly composed of a body, a hydraulic channel, a female buckle, a lower rubber plug, a lower rubber plug hole, an upper rubber plug, and a male buckle. The scheme is: the upper rubber plug is installed in the cement head, the lower rubber plug is installed in the inclined bowl-shaped hydraulic channel, and the two tools are connected by threads. After the upper rubber plug is inserted into the lower rubber plug hole to block the hydraulic channel under the push of the displacement fluid, the upper and lower rubber plugs are moved downward by the pressure of the displacement fluid until they collide with the bottom of the well. When this tool is used, it is not necessary to replace the blowout preventer gate core that matches the casing size before cementing. It is only necessary to connect the present invention with the corresponding casing at the wellhead by threaded buckles, and cement according to conventional procedures. Once overflow occurs during the cementing process or waiting for solidification, the well is directly closed, and then necessary measures are taken according to the situation. The present invention has a simple structure, is easy to use, has low cost, can be recycled, and has strong practicality.

Description

Technical Field

[0001] The invention relates to a downhole tool in the field of oil drilling, in particular to a cementing matching tool which does not require replacement of a well control blowout preventer core. Background Art

[0002] During oil and gas drilling, formation fluids enter the wellbore and overflow. Once the overflow is out of control, it will lead to blowout or uncontrolled blowout, with disastrous consequences. Overflows mostly occur during drilling, but they can also occur during cementing operations, which is not conducive to operational safety. In order to control overflows during cementing operations, the general practice is to replace the blowout preventer gate core that matches the casing size before running the casing. This method is time-consuming and labor-intensive, and the replacement is inconvenient and uneconomical. Summary of the invention

[0003] The purpose of the present invention is to provide a cementing supporting tool without replacing the core of the well control blowout preventer in view of the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0005] A cementing supporting tool for a well control blowout preventer core that does not require replacement comprises an upper rubber plug, an upper body and a lower body; wherein: the bottom of the upper body is fixedly connected to the top of the lower body, the upper body and the lower body both have axial through holes, which are an upper hydraulic channel and a lower hydraulic channel respectively, and the inner diameter of the lower hydraulic channel is larger than the upper hydraulic channel, a lower rubber plug is installed in the lower hydraulic channel of the lower body, and the inner diameter of the bottom of the lower hydraulic channel of the lower body is smaller than the outer diameter of the lower rubber plug; a lower rubber plug hole is axially provided with the lower rubber plug; the upper rubber plug is of an upper cylindrical and lower conical structure, and the outer diameter is slightly larger than the inner diameter of the upper hydraulic channel; the outer diameter of the upper rubber plug is slightly larger than the inner diameter of the lower rubber plug hole, and an interference fit is formed when the upper rubber plug enters the lower rubber plug hole.

[0006] The above scheme further comprises:

[0007] The bottom of the lower hydraulic channel of the lower body is conical or conical arc-shaped.

[0008] The upper and lower ends of the upper body are respectively provided with an upper female buckle and a lower male buckle, and the upper and lower ends of the lower body are respectively provided with an upper female buckle and a lower male buckle; the upper body and the lower body are threadedly connected through the upper male buckle and the lower female buckle.

[0009] The outer diameter of the lower body and the diameter of the lower hydraulic channel are consistent with the diameter of the corresponding casing, and the outer diameter of the upper body and the diameter of the upper hydraulic channel are consistent with the diameter of the drill pipe.

[0010] The supporting tools of the present invention have the following advantages: (1) Before cementing, there is no need to replace the blowout preventer gate core that matches the casing size. It is only necessary to connect the present invention to the casing by threaded fastening and cementing according to the conventional procedure, which saves time and effort. (2) Once overflow is found, the well can be directly shut down, and the wellhead can be quickly controlled, which can meet the cementing well control requirements. (3) The present invention has a simple structure, is easy to use, low cost, recyclable, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The present invention is a schematic diagram of the upper body structure of a cementing supporting tool which does not require replacement of the well control blowout preventer core.

[0012] Figure 2 The present invention is a schematic diagram of the lower body structure of a cementing supporting tool which does not require replacement of the well control blowout preventer core.

[0013] Figure 3 The present invention is a schematic diagram of the upper rubber plug structure of a cementing supporting tool that does not require replacement of the well control blowout preventer core.

[0014] Figure 4 The present invention is a schematic diagram of the lower plug structure of a cementing supporting tool that does not require replacement of the well control blowout preventer core.

[0015] In the figure: 1. upper female buckle, 2. upper body, 3. upper hydraulic channel, 4. upper male buckle, 5. lower female buckle, 6. lower male buckle, 7. lower hydraulic channel, 8. lower body, 9. lower rubber plug, 10. lower rubber plug hole, 11. upper rubber plug. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Example 1: Refer to the attached Figure 1-4 , a cementing supporting tool for a well control blowout preventer core that does not require replacement, comprising an upper rubber plug 11, an upper body 2 and a lower body 8. Among them: the bottom of the upper body 2 is fixedly connected to the top of the lower body 8, and both the upper body 2 and the lower body 8 have axial through holes, which are the upper hydraulic channel 3 and the lower hydraulic channel 7 respectively, and the inner diameter of the lower hydraulic channel 7 is larger than the upper hydraulic channel 3. A lower rubber plug 9 is installed in the lower hydraulic channel 7 of the lower body 8, and the inner diameter of the bottom of the lower hydraulic channel 7 of the lower body 8 is smaller than the outer diameter of the lower rubber plug 9; the lower rubber plug 9 is axially provided with a lower rubber plug hole 10; the upper rubber plug 11 is an upper cylindrical and lower conical structure, and the outer diameter is slightly larger than the inner diameter of the upper hydraulic channel 3; the outer diameter of the upper rubber plug 11 is slightly larger than the inner diameter of the lower rubber plug hole 10, and an interference fit is formed when the upper rubber plug 11 enters the lower rubber plug hole 10.

[0018] Embodiment 2: Based on Embodiment 1, the bottom of the lower hydraulic channel 7 of the lower body 8 is conical or conical arc-shaped.

[0019] Embodiment 3: Further on the basis of Embodiment 2, the upper and lower ends of the upper body 2 are respectively provided with an upper female buckle 1 and a lower male buckle 4, and the upper and lower ends of the lower body 8 are respectively provided with an upper female buckle 5 and a lower male buckle 6; the upper body 2 and the lower body 8 are threadedly connected by the upper male buckle 4 and the lower female buckle 5.

[0020] Embodiment 4: Based on Embodiment 3, the outer diameter of the lower body 8 and the diameter of the lower hydraulic channel 7 are consistent with the diameter of the corresponding casing, and the outer diameter of the upper body 2 and the diameter of the upper hydraulic channel 3 are consistent with the diameter of the drill pipe.

[0021] Typical embodiment 5:

[0022] Refer to the attached Figures 1 to 4 The present invention discloses a cementing supporting tool for a well control blowout preventer core that does not require replacement, which is mainly composed of an upper female buckle 1, an upper body 2, an upper hydraulic channel 3, an upper male buckle 4, a lower female buckle 5, a lower male buckle 6, a lower hydraulic channel 7, a lower body 8, a lower rubber plug 9, a lower rubber plug hole 10, and an upper rubber plug 11. The upper rubber plug 11 is placed in a cement head, and the lower rubber plug 9 is installed in the lower part of the lower hydraulic channel 7 of the lower body 8. The upper male buckle 4 of the upper body 2 is connected to the lower female buckle 5 of the lower body 8 through threads. The inner diameter of the lower hydraulic channel 7 is slightly larger than that of the upper hydraulic channel 3, and the bottom is an inclined bowl shape for easy installation of the lower rubber plug 9.

[0023] The use process of the present invention: before cementing operation, it is not necessary to replace the blowout preventer gate core that matches the casing size. The bottom lower male buckle of the present invention is connected to the casing by threaded fastening. The pre-fluid, isolation fluid, and cement slurry enter the casing through the lower plug hole 10 in turn. After the cement slurry injection volume reaches the design requirement, the upper plug 11 moves downward under the pressure of the displacement fluid. When the upper plug 11 reaches the lower plug 9, the upper plug 11 is embedded in the lower plug hole 10. Under the action of pressure, the displacement fluid pushes the upper plug 11 and the lower plug 9 downward until the bottom of the well hits the pressure. Once overflow occurs during the cementing process or waiting for solidification, the gate clamps the upper end of the upper body to seal the annulus between the casing and the wellbore; cement can be squeezed from the annulus to pressurize the well according to the situation.

[0024] When the tool is used, it is not necessary to replace the blowout preventer gate core that matches the casing size before cementing, and it is only necessary to connect the present invention with the casing at the wellhead.

Claims

1. A cementing tool without replacing the core of a well control blowout preventer, comprising an upper rubber plug (11), an upper body (2) and a lower body (8); characterized in that: The bottom of the upper body (2) is fixedly connected to the top of the lower body (8); the upper body (2) and the lower body (8) both have axial through holes, which are the upper hydraulic channel (3) and the lower hydraulic channel (7), respectively; the inner diameter of the lower hydraulic channel (7) is larger than that of the upper hydraulic channel (3); a lower rubber plug (9) is installed in the lower hydraulic channel (7) of the lower body (8); the inner diameter of the bottom of the lower hydraulic channel (7) of the lower body (8) is smaller than the outer diameter of the lower rubber plug (9); the lower rubber plug (9) is axially provided with a lower rubber plug hole (10); the upper rubber plug (11) is of an upper cylindrical and lower conical structure, and its outer diameter is slightly larger than the inner diameter of the upper hydraulic channel (3); the outer diameter of the upper rubber plug (11) is slightly larger than the inner diameter of the lower rubber plug hole (10), and an interference fit is formed when the upper rubber plug (11) enters the lower rubber plug hole (10); The pre-fluid, the spacer fluid and the cement slurry enter the casing through the lower rubber plug hole (10) in sequence. When the cement slurry injection volume reaches the design requirement, the upper rubber plug (11) moves downward under the pressure of the displacement fluid. When the upper rubber plug (11) reaches the lower rubber plug (9), the upper rubber plug (11) is embedded in the lower rubber plug hole (10). Under the action of the displacement fluid, the upper rubber plug (11) and the lower rubber plug (9) are pushed downward by the pressure until they hit the bottom of the well.

2. The cementing supporting tool without replacing the well control blowout preventer core according to claim 1, characterized in that: The bottom of the lower hydraulic channel (7) of the lower body (8) is conical or conical arc-shaped.

3. A cementing tool without replacing the well control blowout preventer core according to claim 1 or 2, characterized in that: The upper and lower ends of the upper body (2) are respectively provided with an upper female buckle (1) and an upper male buckle (4), and the upper and lower ends of the lower body (8) are respectively provided with a lower female buckle (5) and a lower male buckle (6); the upper body (2) and the lower body (8) are threadedly connected via the upper male buckle (4) and the lower female buckle (5).

4. The cementing supporting tool without replacing the well control blowout preventer core according to claim 3, characterized in that: The outer diameter of the lower body (8) and the diameter of the lower hydraulic channel (7) are consistent with the diameter of the corresponding casing, and the outer diameter of the upper body (2) and the diameter of the upper hydraulic channel (3) are consistent with the diameter of the drill pipe.

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