Automatic grouting float collar for well cementation

Abstract

The utility model relates to the field of well cementation float collars, in particular to an automatic grouting float collar for well cementation, which comprises a well cementation coupling, the inner wall of the well cementation coupling is fixedly connected with a fixing ring, and the horizontal section of the fixing ring is annular; the blocking mechanism is installed on the inner side of the fixing ring, and the surface of the blocking mechanism extends to the position below the fixing ring; the plugging mechanism comprises a top sealing assembly installed at the lower end of the fixing ring, and the surface of the top sealing assembly extends into the fixing ring. According to the automatic grouting float collar for well cementation, secondary sealing operation can be conducted on the liquidity of liquid under the action of the plugging mechanism, sealing is conducted through cooperation of the conical plugging block and the circulation ring, meanwhile, secondary sealing is conducted on the inner wall of the sleeve through the arranged plugging air bag, and auxiliary plugging can be conducted on the inner wall of the sleeve under the action of the rubber ring strip; and the sealing performance of plugging is ensured.

Description

Technical Field

[0001] This utility model relates to the field of cementing floats, and in particular to an automatic grouting float for cementing. Background Technology

[0002] Cementing, the process of running casing into the well and injecting cement into the annular space between the wellbore and the casing, is an essential part of the drilling and completion process. It includes running casing and cementing. Casing floaters, which are casing couplings equipped with one-way valves, are one of the casing accessories. In deep wells and special wells, they can be used in conjunction with casing float shoes to improve the safety of cementing operations.

[0003] During the casing running process, unidirectional flow of drilling fluid in the annulus is achieved to prevent backflow of cement slurry during cementing and to allow for pressure release and setting after cementing, which helps to improve the bonding quality between the cement sheath and the casing. At the same time, by injecting drilling fluid into the casing string to adjust its buoyancy, the casing suspension weight meets the design requirements for the casing running operation.

[0004] A search of existing technology revealed an "Automatic Grouting Float Hoop for Cementing" with publication number "CN219993669U". After grouting is completed, the end of the ball head passes through the upper drainage hole and the handle sticks to fit with the sealing gasket. The top pushes the float plate, thereby stopping the grouting. However, due to the sealing effect, seepage may occur, resulting in poor sealing and affecting the sealing effect of the float hoop.

[0005] Therefore, an automatic grouting float for cementing is proposed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide an automatic grouting float ring for cementing to solve the above-mentioned problems, thereby improving the sealing effect of the float ring, which may lead to seepage due to poor sealing.

[0007] This utility model achieves the above-mentioned objective through the following technical solution: an automatic grouting float collar for cementing, comprising: a cementing coupling, wherein a fixing ring is fixedly connected to the inner wall of the cementing coupling, and the horizontal cross-section of the fixing ring is annular; a sealing mechanism, wherein the sealing mechanism is installed on the inner side of the fixing ring, and the surface of the sealing mechanism extends to the lower part of the fixing ring; wherein the sealing mechanism includes a top sealing assembly installed at the lower end of the fixing ring, the surface of the top sealing assembly extends to the interior of the fixing ring, and a plugging component is provided on the surface of the top sealing assembly, and the plugging component is located below the fixing ring.

[0008] Preferably, the top sealing assembly includes a sleeve fixedly connected to the lower end of the fixed ring. An upper positioning frame is fixedly connected to the inner wall of the sleeve. A round rod is slidably connected to the inner wall of the upper positioning frame. A conical sealing block is fixedly connected to the upper end of the round rod. A flow ring is fixedly connected to the inner wall of the fixed ring. The surface of the flow ring contacts the surface of the conical sealing block. Through the interior of the flow ring, the conical sealing block is squeezed and moves downward, thereby causing the conical sealing block to drive the round rod to move downward as well.

[0009] Preferably, the sealing assembly includes a fixed plate fixedly connected to the surface of the round rod. A spring is fixedly connected to the upper end of the fixed plate. The spring is sleeved on the surface of the round rod. The upper end of the spring is fixedly connected to the lower end of the upper positioning frame. A sealing airbag is sleeved on the outside of the spring. The sealing airbag contacts the inner wall of the sleeve. When the round rod moves up and down, it drives the fixed plate to move synchronously. When the fixed plate moves up with the round rod, it drives the sealing airbag to move synchronously up. As a result, the sealing airbag is fixed below the upper positioning frame and is compressed and expands horizontally.

[0010] Preferably, the lower end of the upper positioning frame is provided with a lower positioning frame fixedly connected to the inner wall of the sleeve, the inner wall of the lower positioning frame is slidably connected to the surface of the round rod, and the upper positioning frame and the lower positioning frame maintain a vertical movement trend.

[0011] Preferably, a float is provided below the lower positioning frame, and the float is fixedly connected to the lower end of the round rod. This arrangement can assist the round rod to move upward under the action of drilling fluid buoyancy, thereby driving the conical sealing block to seal the flow ring.

[0012] Preferably, the inner wall of the sealing airbag is fixedly connected with multiple rubber strips, which are distributed in a ring shape along the surface of the sealing airbag. When the spring is compressed, it works with the rubber strips to provide auxiliary support to the inner side of the sealing airbag.

[0013] Preferably, a rubber ring strip is fixedly connected to the lower end of the surface of the sealing airbag. The surface of the rubber ring strip is in contact with the inner wall of the sleeve. The rubber ring strip assists in sealing under its action. The spring is located inside the sealing airbag to provide auxiliary protection for the spring.

[0014] The beneficial effects of this utility model are:

[0015] 1. The above-mentioned automatic grouting float collar for cementing can perform a secondary sealing operation on the fluidity of the liquid under the action of the sealing mechanism. The device seals by using a conical sealing block in conjunction with a flow ring, and the sealing airbag provides a secondary seal to the inner wall of the sleeve. Furthermore, the rubber ring strip will assist in sealing the inner wall of the sleeve, ensuring the sealing performance.

[0016] 2. By setting up a sealing component, the round rod can be assisted in resetting under the action of the sealing component. The device uses a spring located inside the sealing airbag to provide auxiliary protection for the spring, reducing the contact between external liquid and the spring. When the spring is compressed, it works with the rubber strip to provide auxiliary support to the inside of the sealing airbag, ensuring the sealing performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a partial exploded view of the top sealing assembly of this utility model;

[0020] Figure 4 This is a schematic diagram of a partial explosion structure of the sealing component of this utility model.

[0021] In the diagram: 1. Cementing coupling; 2. Fixing ring; 3. Sealing mechanism; 31. Top sealing assembly; 311. Sleeve; 312. Upper positioning frame; 313. Lower positioning frame; 314. Round rod; 315. Conical sealing block; 316. Flow ring; 317. Float; 32. Sealing assembly; 321. Fixing disc; 322. Spring; 323. Sealing airbag; 324. Rubber strip; 325. Rubber ring strip. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In practical implementation: such as Figure 1-4 As shown, an automatic grouting float collar for cementing includes: a cementing coupling 1, with a fixing ring 2 fixedly connected to the inner wall of the cementing coupling 1, the horizontal cross-section of the fixing ring 2 being annular; a sealing mechanism 3, which is installed on the inner side of the fixing ring 2, the surface of the sealing mechanism 3 extending to the lower part of the fixing ring 2; wherein, the sealing mechanism 3 includes a top sealing assembly 31 installed at the lower end of the fixing ring 2, the surface of the top sealing assembly 31 extending to the interior of the fixing ring 2, and a plugging assembly 32 disposed on the surface of the top sealing assembly 31, the plugging assembly 32 being located below the fixing ring 2;

[0024] like Figure 1 , Figure 2 and Figure 3As shown, the top sealing assembly 31 includes a sleeve 311 fixedly connected to the lower end of the fixing ring 2. An upper positioning frame 312 is fixedly connected to the inner wall of the sleeve 311. A round rod 314 is slidably connected to the inner wall of the upper positioning frame 312. A conical sealing block 315 is fixedly connected to the upper end of the round rod 314. A flow ring 316 is fixedly connected to the inner wall of the fixing ring 2. The surface of the flow ring 316 is in contact with the surface of the conical sealing block 315. A lower positioning frame 313 is fixedly connected to the inner wall of the sleeve 311 at the lower end of the upper positioning frame 312. The inner wall of the lower positioning frame 313 is slidably connected to the surface of the round rod 314. A float 317 is provided below the lower positioning frame 313. The float 317 is fixedly connected to the lower end of the round rod 314.

[0025] When the device is in use, two pipes are fixedly connected inside the cementing coupling 1. When the drilling fluid inside the pipe flows downward, it can pass through the inside of the flow ring 316. At this time, the conical sealing block 315 is squeezed and moves downward, which in turn causes the conical sealing block 315 to drive the round rod 314 to move downward. When the round rod 314 moves downward, it maintains a vertical movement trend under the action of the upper positioning frame 312 and the lower positioning frame 313. Furthermore, the float 317 can assist the round rod 314 to move upward under the action of the buoyancy of the drilling fluid, thereby driving the conical sealing block 315 to seal the flow ring 316.

[0026] like Figure 1 , Figure 2 and Figure 4 As shown, the sealing assembly 32 includes a fixed plate 321 fixedly connected to the surface of the round rod 314. A spring 322 is fixedly connected to the upper end of the fixed plate 321. The spring 322 is sleeved on the surface of the round rod 314. The upper end of the spring 322 is fixedly connected to the lower end of the upper positioning frame 312. A sealing airbag 323 is sleeved on the outside of the spring 322. The sealing airbag 323 contacts the inner wall of the sleeve 311. A plurality of rubber strips 324 are fixedly connected to the inner wall of the sealing airbag 323. The plurality of rubber strips 324 are distributed in a ring shape along the surface of the sealing airbag 323. A rubber ring strip 325 is fixedly connected to the lower end of the surface of the sealing airbag 323. The surface of the rubber ring strip 325 contacts the inner wall of the sleeve 311.

[0027] When the device is in use, the circular rod 314 moves up and down, causing the fixed plate 321 to move synchronously. As the fixed plate 321 moves upward with the circular rod 314, it causes the sealing airbag 323 to move upward synchronously, thus fixing the sealing airbag 323 below the upper positioning frame 312. The airbag is compressed and expands horizontally. When the sealing airbag 323 expands, it provides secondary sealing to the inner wall of the sleeve 311, and the rubber ring strip 325 assists in the sealing. The spring 322 is located inside the sealing airbag 323, providing auxiliary protection for the spring 322 and reducing the contact between the external liquid and the spring 322. When the spring 322 is compressed, it works with the rubber strip 324 to provide auxiliary support to the inner side of the sealing airbag 323. When the circular rod 314 moves downward, it causes the fixed plate 321 to move downward synchronously. At this time, the sealing airbag 323 stretches vertically and contracts horizontally, keeping the liquid flowing within the sleeve 311.

[0028] In use, the cementing coupling 1 internally connects two pipe bodies. When the drilling fluid inside the pipe body flows downward, it squeezes the conical sealing block 315 downward through the inside of the flow ring 316. The conical sealing block 315 drives the round rod 314 to move downward as well. When the round rod 314 moves downward, it cooperates with the upper positioning frame 312 and the lower positioning frame 313 to maintain a vertical movement trend. The float 317, under the action of the buoyancy of the drilling fluid, assists the round rod 314 to move upward and drive the conical sealing block 315 to move downward. 15 pairs of flow rings 316 are blocked. The movement of the round rod 314 drives the fixed plate 321 to move synchronously. When the fixed plate 321 moves upward with the round rod 314, it drives the blocking airbag 323 to move upward synchronously. The blocking airbag 323 is fixed below the upper positioning frame 312 and expands horizontally. When the round rod 314 moves downward, it drives the fixed plate 321 to move downward synchronously. The blocking airbag 323 stretches vertically and contracts horizontally to maintain the fluidity of the liquid in the sleeve 311.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic grouting float for cementing, characterized in that, include: Cementing coupling (1), the inner wall of which is fixedly connected to a fixing ring (2), the horizontal cross section of which is annular; A blocking mechanism (3) is installed on the inner side of a fixing ring (2), and the surface of the blocking mechanism (3) extends to the bottom of the fixing ring (2); The sealing mechanism (3) includes a top sealing assembly (31) installed at the lower end of the fixed ring (2), the surface of the top sealing assembly (31) extends into the interior of the fixed ring (2), and a plugging assembly (32) is provided on the surface of the top sealing assembly (31), the plugging assembly (32) being located below the fixed ring (2); The top sealing assembly (31) includes a sleeve (311) fixedly connected to the lower end of the fixing ring (2). An upper positioning frame (312) is fixedly connected to the inner wall of the sleeve (311). A round rod (314) is slidably connected to the inner wall of the upper positioning frame (312). A conical sealing block (315) is fixedly connected to the upper end of the round rod (314). A flow ring (316) is fixedly connected to the inner wall of the fixing ring (2). The surface of the flow ring (316) is in contact with the surface of the conical sealing block (315). The sealing assembly (32) includes a fixed plate (321) fixedly connected to the surface of the round rod (314). A spring (322) is fixedly connected to the upper end of the fixed plate (321). The spring (322) is sleeved on the surface of the round rod (314). The upper end of the spring (322) is fixedly connected to the lower end of the upper positioning frame (312). A sealing airbag (323) is sleeved on the outside of the spring (322). The sealing airbag (323) is in contact with the inner wall of the sleeve (311).

2. The automatic grouting float collar for cementing according to claim 1, characterized in that: The lower end of the upper positioning frame (312) is provided with a lower positioning frame (313) which is fixedly connected to the inner wall of the sleeve (311). The inner wall of the lower positioning frame (313) is slidably connected to the surface of the round rod (314).

3. The automatic grouting float collar for cementing according to claim 2, characterized in that: A float (317) is provided below the lower positioning frame (313), and the float (317) is fixedly connected to the lower end of the round rod (314).

4. The automatic grouting float collar for cementing according to claim 1, characterized in that: The inner wall of the sealing airbag (323) is fixedly connected with a plurality of rubber strips (324), and the plurality of rubber strips (324) are distributed in a ring shape along the surface of the sealing airbag (323).

5. The automatic grouting float for cementing according to claim 4, characterized in that: A rubber ring strip (325) is fixedly connected to the lower end of the surface of the sealing airbag (323), and the surface of the rubber ring strip (325) is in contact with the inner wall of the sleeve (311).

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