Self-filling type reaming rotary float shoe

Abstract

The utility model relates to a float shoe, in particular to a self-filling type reaming rotary float shoe which comprises a float shoe body, a grouting channel is arranged in the float shoe body, and a slurry filling assembly and a port control assembly are arranged in the grouting channel. Wherein the slurry filling assembly comprises a valve seat arranged on the inner wall of a grouting channel, a valve element matched with the valve seat and a rotary guiding shoe head arranged at the rear end of the grouting channel, the rear end of the valve element is connected with the port control assembly, and the port control assembly is fixed to the inner wall of the grouting channel through a connecting piece. And a plurality of mud passing holes are formed in the connecting piece. The slurry self-filling device is simple in structure, easy and convenient to operate, capable of achieving slurry self-filling and automatic releasing of self-filling, and suitable for small-pressure slurry filling.

Description

Technical Field

[0001] This utility model belongs to the field of cementing technology in oil and gas extraction, specifically a self-filling rotary float shoe for drilling. Background Technology

[0002] In the existing technology, during the cementing and casing process, in order to ensure that the casing is safely and smoothly lowered into the predetermined position in the wellbore, a float shoe needs to be installed at the lower end of the casing string to guide the casing smoothly into the wellbore, avoid scraping the well wall and rocks during the casing process, and prevent fluid in the annulus from flowing back into the casing.

[0003] In the prior art, Chinese patent application CN2022112466543 discloses a self-filling float shoe for cementing, including an outer shell, a support plate fixedly connected inside the outer shell, a guide shell fixedly connected to the support plate, a valve stem slidably connected to the guide shell, a support plate fixedly connected to the valve stem, a spring plate hinged between the support plate and the guide shell, a valve core fixedly connected to the valve stem via symmetrically distributed folding rods, and a valve seat fixedly connected inside the outer shell to seal with the valve core. However, existing self-filling float shoes have a complex structure and operation during mud self-filling, and require high mud pressure; low-pressure mud will affect mud self-filling. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a self-filling swivel rotating float shoe that is simple in structure, easy to operate, can realize self-filling of mud and automatic release of self-filling, and is suitable for mud injection under low pressure.

[0005] The technical solution includes a floating shoe body, which has a grouting channel. The grouting channel is equipped with a mud injection component and a port control component. The mud injection component includes a valve seat disposed on the inner wall of the grouting channel, a valve core that cooperates with the valve seat, and a rotating shoe guide head disposed at the rear end of the grouting channel. The rear end of the valve core is connected to the port control component. The port control component is fixed to the inner wall of the grouting channel via a connector, which has multiple mud passage holes.

[0006] The rotating shoe toe is rotatably connected to the rear end of the floating shoe body via rotating steel balls.

[0007] The front end of the valve core is hemispherical, and the mating surface between the valve seat and the valve core is also arc-shaped.

[0008] The outer periphery of the floating shoe is evenly provided with multiple eyelets.

[0009] The port control assembly includes a valve stem connected to the valve core at the front end, a spring seat fitted outside the valve stem, and a spring that rests against the valve core at the front end and is mounted on the spring seat at the rear end.

[0010] The valve stem extends out of the spring seat and has multiple steel ball grooves evenly distributed radially on the outer wall of the rear end. The spring seat has a fixing sleeve at the rear end, and a limiting steel ball is installed between the steel ball groove and the fixing sleeve.

[0011] Beneficial effects:

[0012] This utility model utilizes the cooperation of valve core and valve seat to realize the opening and closing of grouting channel. The rotating guide shoe head is rotatably connected to the rear end of the floating shoe body via rotating steel ball. The rotation of the rotating guide shoe head is used to rotate and suck grout. When the steel ball jams the spring seat to limit the valve rod, the valve core and valve seat are opened, and the rear end of the grouting channel is in a conductive state to the front end, which can realize the self-flow of mud grouting.

[0013] When the upper mud is reinjected, the mud pressure will further act on the valve core, increasing the opening degree of the valve core and valve seat. The front end of the grouting channel is in a conductive state from the rear end. At the same time, the pressure pushes the valve rod to release the steel ball limit. After the mud reinjection stops, the spring pressure rebounds, and the valve core and valve seat close automatically. This utility model has an extremely simple structure, is easy to operate, does not require ball injection to pressurize or drill pipe to release, and has high cementing efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of the present invention in its non-self-irrigation state;

[0015] Figure 2 This is a schematic diagram of the internal structure of the present invention in its self-irrigation state;

[0016] Figure 3 This is another side view of the present invention;

[0017] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0018] The numbers in the figure represent:

[0019] 1. Floating shoe body; 2. Mud grouting assembly; 21. Valve seat; 22. Valve core; 23. Mud passage hole; 24. Rotating steel ball; 25. Rotating guide shoe toe; 26. Scraping ridge; 3. Through-hole control assembly; 31. Spring; 32. Spring seat; 33. Steel ball groove; 34. Limiting steel ball; 35. Fixing sleeve; 36. Valve stem; 4. Grouting channel; 5. Connecting parts. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] See Figure 1 and Figure 2 The floating shoe body 1 is provided with a grouting channel 4, and the grouting channel 4 is provided with a mud slurry delivery component 2 and an inlet control component 3.

[0022] The mud injection assembly 2 includes a valve seat 21 disposed on the inner wall of the injection channel 4, a valve core 22 that mates with the valve seat 21, and a rotating guide shoe head 25 disposed at the rear end of the injection channel 4. The rotating guide shoe head 25 is rotatably connected to the rear end of the floating shoe body 1 via a rotating steel ball 24. The front end of the valve core 22 is hemispherical, and the mating surface between the valve seat 21 and the valve core 22 is also correspondingly arc-shaped.

[0023] The valve core 22 is connected to the port control component 3 at its rear end. The port control component 3 is fixed to the inner wall of the grouting channel 4 via a connector 5, which has multiple mud passage holes 23. The float shoe body 1 has multiple shaving ridges 26 evenly distributed on its outer periphery, which can effectively remove obstacles during drilling and ensure smooth descent.

[0024] The port control assembly 3 includes a valve stem 36 connected to the valve core 22 at the front end, a spring seat 32 fitted outside the valve stem 36, and a spring 31 whose front end abuts against the valve core 22 and whose rear end is mounted on the spring seat 32.

[0025] The valve stem 36 extends out of the rear end of the spring seat 32 and has a plurality of steel ball grooves 33 evenly formed radially on the outer wall. The rear end of the spring seat 32 is provided with a fixing sleeve 35, and a limiting steel ball 34 is installed between the steel ball grooves 33 and the fixing sleeve 35.

[0026] In use, the front end of the grouting channel 4 inside the floating shoe body 1 is connected to the external pipeline. When grout is sucked, there is a gap between the valve seat 21 and the valve core 22. The spring 31 is in a compressed state. The limiting steel ball 34 is pressed against the rear end of the spring seat 32 under the limiting of the steel ball groove 33 and the fixing sleeve 35, keeping the valve seat 21 and the valve core 22 in an open state. The rotating guide shoe head 25 is used to rotate and suck grout. The mud enters the grouting channel 4 of the floating shoe body 1 through the opening of the rotating guide shoe head 25, and then flows to the external pipeline through the mud passage 23 and the gap between the valve seat 21 and the valve core 22.

[0027] When the upper mud is reinjected, the grouting pressure from the external connecting pipe acts on the valve core 22, causing the valve core 22 to move further away from the valve seat 21. The gap between the valve seat 21 and the valve core 22 is further increased. The injected mud enters the grouting channel 4 through the gap between the valve seat 21 and the valve core 22, then through the mud passage 23, and finally through the opening of the rotating guide shoe head 25 for mud reinjection. At the same time, the valve core 22 moves backward under the mud pressure, further compressing the spring 31 and driving the valve stem 36 to move backward. The limiting steel ball 34 moves backward until it is released from the limit of the fixed sleeve 35 and then comes out, releasing the limitation of the limiting steel ball 34 on the rear end of the spring seat 32.

[0028] When the mud backfilling stops, the valve core 22 loses the upstream pressure and the spring 31 rebounds, causing the valve core 22 to move towards the valve seat 21. When the valve stem 36 moves, it will not be limited by the steel ball 34. Under the action of the spring, the valve core 22 and the valve seat 21 will eventually fit tightly together, realizing the self-closure of the grouting channel 4 inside the floating shoe body 1.

Claims

1. A self-filling, rotating, perforated floating shoe, comprising a floating shoe body, wherein the floating shoe body is provided with a grouting channel, characterized in that, The grouting channel is equipped with a mud slurry delivery component and a port control component. The mud slurry delivery component includes a valve seat disposed on the inner wall of the grouting channel, a valve core that cooperates with the valve seat, and a rotating guide shoe head disposed at the rear end of the grouting channel. The rear end of the valve core is connected to the port control component. The port control component is fixed to the inner wall of the grouting channel via a connector, and the connector has multiple mud passage holes.

2. The self-filling, rotating floating shoe as described in claim 1, characterized in that, The rotating shoe toe is rotatably connected to the rear end of the floating shoe body via rotating steel balls.

3. The self-filling, rotating floating shoe as described in claim 1, characterized in that, The front end of the valve core is hemispherical, and the mating surface between the valve seat and the valve core is also arc-shaped.

4. The self-filling, rotating floating shoe as described in claim 1, characterized in that, The outer periphery of the floating shoe is evenly provided with multiple eyelets.

5. The self-filling, rotating, eye-paving floating shoe as described in any one of claims 1-4, characterized in that, The port control assembly includes a valve stem connected to the valve core at the front end, a spring seat fitted outside the valve stem, and a spring that rests against the valve core at the front end and is mounted on the spring seat at the rear end.

6. The self-filling, rotating, eye-filling floating shoe as described in claim 5, characterized in that, The valve stem extends out of the spring seat and has multiple steel ball grooves evenly distributed radially on the outer wall of the rear end. The spring seat has a fixing sleeve at the rear end, and a limiting steel ball is installed between the steel ball groove and the fixing sleeve.

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