Large-passage precision pressure control floating cementing tool

Abstract

The utility model relates to the technical field of well drilling tool, concretely relates to a big drift precision pressure control floating cementing tool, including coupling body and pressure difference mechanism, pressure difference mechanism includes pressure difference sleeve, fixed ring, four fixed assemblies and floating assembly, and pressure difference sleeve and coupling body sliding connection, and fixed ring and pressure difference sleeve fixed connection, and four fixed assemblies evenly set up outside fixed ring, and floating assembly sets up below pressure difference sleeve, and fixed assembly includes locating block, first spring and limit piece, and one end of locating block and coupling body sliding connection, and limit piece and locating block fixed connection lie in the side of locating block, and first spring sets up inside coupling body, and the outer wall of pressure difference sleeve is provided with the clamping hole, and the clamping hole and locating block are adapted, and through the setting of above -mentioned structure, the problem of unstable structure of the prior art is solved, and the butt joint of sleeve is completed through the fracture of shearing pin.

Description

Technical Field

[0001] This utility model relates to the field of drilling tool technology, and in particular to a large-diameter, precision pressure-controlled floating cementing tool. Background Technology

[0002] In oil, gas, and geological exploration cementing and completion methods, the smooth running of the casing is the last step before cementing. The casing is the most common tool accessory for completion strings. However, when the casing is run into a long horizontal section of the well, the longer the horizontal section is run, the greater the friction. Once an obstruction point is encountered or the well wall changes irregularly, it will cause difficulties in running the completion string, getting stuck during running, and low efficiency in running the casing, which will have a significant impact on the cementing quality.

[0003] In the prior art, patent document CN108301788B mentions a floating coupling device, including a coupling body. The coupling body is a cylindrical shape with an internally permeable mounting cavity. A differential pressure sleeve is fixedly installed on the upper part of the mounting cavity of the coupling body through a pin hole and a shear pin. The differential pressure sleeve is a cylindrical shape that is larger at the top and smaller at the bottom. This prior art creates a temporary barrier inside the casing. The casing string below the sliding circular plate is filled with air, and the casing string above the sliding circular plate is filled with drilling fluid. This increases the buoyancy of the casing string below the sliding circular plate, keeping the lower casing string floating during the casing string running. After the casing string reaches the predetermined position, the sliding sleeve and the sliding circular plate shear the shear pin and move it downward, allowing the drilling fluid in the upper casing to enter the lower casing, making the casing string easier to run. This effectively reduces the resistance of the casing string running and improves the efficiency of casing running and cementing quality.

[0004] However, the aforementioned existing technology, which completes the sleeve connection by shearing the pin to break, results in an unstable structure. Utility Model Content

[0005] The purpose of this invention is to provide a large-diameter, precision-controlled, floating cementing tool that solves the problem of structural instability in existing technologies, which rely on shearing pins to break off the sleeves.

[0006] To achieve the above objectives, this utility model provides a large-diameter precision pressure-controlled floating cementing tool, including a coupling body and a differential pressure mechanism. The differential pressure mechanism includes a differential pressure sleeve, a fixing ring, four fixing components, and a floating component. The differential pressure sleeve is slidably connected to the coupling body and is disposed inside the coupling body. The fixing ring is fixedly connected to the differential pressure sleeve and is located outside the differential pressure sleeve. The four fixing components are evenly disposed outside the fixing ring. The floating component is disposed below the differential pressure sleeve. Each fixing component includes a positioning block, a first spring, and a limiting plate. One end of the positioning block is slidably connected to the coupling body. The limiting plate is fixedly connected to the positioning block and is located on one side of the positioning block. The first spring is disposed inside the coupling body and is located on one side of the limiting plate. A locking hole is provided on the outer wall of the differential pressure sleeve, and the locking hole is adapted to the positioning block.

[0007] The fixing component further includes four limiting strips, which are fixedly connected to the coupling body and are evenly arranged inside the coupling body.

[0008] The fixing component further includes a push plate and several connecting blocks. One end of each connecting block is fixedly connected to the differential pressure sleeve, and the other end of each connecting block is fixedly connected to the push plate. They are evenly arranged at the lower end of the differential pressure sleeve, and an opening is provided between two adjacent connecting blocks.

[0009] The floating assembly includes a fixed sleeve, four fixing pins, a sealing plate, and four telescopic structures. The fixed sleeve is slidably connected to the coupling body and covers the lower end of the differential pressure sleeve. The four fixing pins pass through the coupling body and the fixed sleeve and are evenly arranged on the outside of the fixed sleeve. The sealing plate is located at the lower end of the fixed sleeve, and the four telescopic structures are evenly arranged on the outside of the sealing plate.

[0010] Each of the telescopic structures includes a positioning rod and a second spring. One end of the positioning rod is fixedly connected to the closing plate, and the other end of the positioning rod is fixedly connected to the fixing sleeve. The cross-section of the positioning rod is T-shaped, and the second spring covers the surface of the positioning rod.

[0011] This utility model discloses a large-diameter precision pressure-controlled floating cementing tool. The differential pressure sleeve is slidably connected to the coupling body and disposed inside the coupling body. The fixing ring is fixedly connected to the differential pressure sleeve and located on the outside of the differential pressure sleeve. Four fixing components are evenly disposed on the outside of the fixing ring. The floating component is disposed below the differential pressure sleeve. One end of the positioning block is slidably connected to the coupling body, and the other end of the positioning block is fixedly connected to the base plate and located on one side of the base plate. A limiting plate is fixedly connected to the positioning block and located on one side of the positioning block. A first spring is disposed inside the coupling body and located on one side of the limiting plate. A locking hole is provided on the outer wall of the differential pressure sleeve, and the locking hole is adapted to the positioning block. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a structural schematic diagram of the large-diameter precision pressure-controlled floating cementing tool of this utility model.

[0014] Figure 2 This is a top view of the large-diameter precision pressure-controlled floating cementing tool of this utility model.

[0015] Figure 3 This is the utility model Figure 2 A sectional view along line AA.

[0016] Figure 4 This is the utility model Figure 3 A magnified view of section B.

[0017] 1-Coupling body, 2-Differential pressure sleeve, 3-Fixing ring, 4-Positioning block, 5-First spring, 6-Limiting strip, 7-Push plate, 8-Connecting block, 9-Limiting piece, 10-Fixing sleeve, 11-Fixing pin, 12-Sealing plate, 13-Positioning rod, 14-Second spring, 15-Snap hole, 16-Opening. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] Please see Figures 1-4,in, Figure 1 This is a structural schematic diagram of the large-diameter precision pressure-controlled floating cementing tool of this utility model. Figure 2 This is a top view of the large-diameter precision pressure-controlled floating cementing tool of this utility model. Figure 3 This is the utility model Figure 2 AA-line sectional view, Figure 4 This is the utility model Figure 3 A magnified view of section B.

[0020] This utility model provides a large-diameter precision pressure-controlled floating cementing tool, including a coupling body 1 and a differential pressure mechanism. The differential pressure mechanism includes a differential pressure sleeve 2, a fixing ring 3, four fixing components and a floating component. The fixing components include a positioning block 4, a first spring 5, four limiting strips 6, a push plate 7, several connecting blocks 8 and limiting pieces 9. The floating component includes a fixing sleeve 10, four fixing pins 11, a sealing plate 12 and four telescopic structures. Each telescopic structure includes a positioning rod 13 and a second spring 14. The aforementioned solution solves the problem of instability in the existing technology, where the sleeve connection is completed by shearing the pins and breaking them.

[0021] In this specific embodiment, the differential pressure sleeve 2 is slidably connected to the coupling body 1 and is disposed inside the coupling body 1. The fixing ring 3 is fixedly connected to the differential pressure sleeve 2 and is located on the outside of the differential pressure sleeve 2. The four fixing components are evenly disposed on the outside of the fixing ring 3. The floating component is disposed below the differential pressure sleeve 2. One end of the positioning block 4 is slidably connected to the coupling body 1. The limiting piece is fixedly connected to the positioning block 4 and is located on one side of the positioning block 4. The first spring 5 is disposed inside the coupling body 1. Located on one side of the limiting piece 9, the differential pressure sleeve 2 has a locking hole 15 on its outer wall. The locking hole 15 is adapted to the positioning block 4. The differential pressure sleeve 2 is locked inside the main body by the positioning block 4. There is raw material above the differential pressure sleeve 2 and a cavity below the differential pressure sleeve 2. When the main body is installed, the presence of air can provide some buoyancy, which facilitates the fixation of the main body. When the pressure of the raw material is large enough, the first spring 5 contracts accordingly, the positioning block 4 leaves the locking hole 15, and the differential pressure sleeve 2 moves down and connects with the floating component.

[0022] The four limiting strips 6 are fixedly connected to the coupling body 1 and are evenly arranged inside the coupling body 1. The limiting strips 6 restrict the stability of the differential pressure sleeve 2 and improve the position of the differential pressure sleeve 2.

[0023] Secondly, one end of several connecting blocks 8 is fixedly connected to the differential pressure sleeve 2, and the other end of several connecting blocks 8 is fixedly connected to the push plate 7, and they are evenly arranged at the lower end of the differential pressure sleeve 2. An opening 16 is provided between two adjacent connecting blocks 8. The push plate 7 is located inside the floating assembly, forming a closed space for storing air.

[0024] Secondly, the fixed sleeve 10 is slidably connected to the coupling body 1 and covers the lower end of the differential pressure sleeve 2. The four fixed pins 11 pass through the coupling body 1 and the fixed sleeve 10 and are evenly arranged on the outside of the fixed sleeve 10. The sealing plate 12 is arranged at the lower end of the fixed sleeve 10. The four telescopic structures are evenly arranged on the outside of the sealing plate 12. The push plate 7 pushes the sealing plate, causing the sealing plate to move accordingly. The lower end of the body is connected to the differential pressure sleeve 2 through several openings 16.

[0025] In addition, one end of the positioning rod 13 is fixedly connected to the sealing plate 12, and the other end of the positioning rod 13 is fixedly connected to the fixing sleeve 10. The cross-section of the positioning rod 13 is T-shaped. The second spring 14 covers the surface of the positioning rod 13. The second spring 14 pushes the positioning rod 13, so that the sealing plate and the fixing sleeve 10 are fixed to close the fixing sleeve 10.

[0026] When using this utility model, there is raw material above the differential pressure sleeve 2 and a cavity below the differential pressure sleeve 2. When the main body is installed, the presence of air can provide some buoyancy, which facilitates the fixation of the main body. When the pressure of the raw material is large enough, the first spring 5 contracts accordingly, the positioning block 4 leaves the locking hole 15, the differential pressure sleeve 2 moves down, and the push plate 7 pushes the sealing plate, causing the sealing plate to move accordingly. The lower end of the main body is connected to the differential pressure sleeve 2 through several openings 16.

[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A large-diameter precision pressure control floating cementing tool, comprising a coupling body, characterized in that, a differential pressure mechanism is further included, the differential pressure mechanism comprises a differential pressure sleeve, a fixed ring, four fixed assemblies and a floating assembly, the differential pressure sleeve is in sliding connection with the coupling body and is arranged inside the coupling body, the fixed ring is in fixed connection with the differential pressure sleeve and is located outside the differential pressure sleeve, four fixed assemblies are uniformly arranged outside the fixed ring, and the floating assembly is arranged below the differential pressure sleeve. The fixed assembly comprises a positioning block, a first spring and a limiting sheet, one end of the positioning block is in sliding connection with the coupling body, the limiting sheet is in fixed connection with the positioning block and is located on one side of the positioning block, the first spring is arranged inside the coupling body and is located on one side of the limiting sheet, and a clamping hole is arranged on the outer wall of the differential pressure sleeve and is matched with the positioning block.

2. The large-diameter precision pressure control floating cementing tool according to claim 1, characterized in that, the fixed assembly further comprises four limiting strips, and the four limiting strips are in fixed connection with the coupling body and are uniformly arranged inside the coupling body.

3. The large-diameter precision pressure control floating cementing tool according to claim 2, characterized in that, the fixed assembly further comprises a push plate and a plurality of connecting blocks, one end of each connecting block is in fixed connection with the differential pressure sleeve, the other end of each connecting block is in fixed connection with the push plate and is uniformly arranged at the lower end of the differential pressure sleeve, and an opening is arranged between adjacent two connecting blocks.

4. The large-diameter precision pressure control floating cementing tool according to claim 3, characterized in that, the floating assembly comprises a fixed sleeve, four fixed pins, a closing plate and four telescopic structures, the fixed sleeve is in sliding connection with the coupling body and covers the lower end of the differential pressure sleeve, the four fixed pins pass through the coupling body and the fixed sleeve and are uniformly arranged outside the fixed sleeve, the closing plate is arranged at the lower end of the fixed sleeve, and the four telescopic structures are uniformly arranged outside the closing plate.

5. The large-diameter precision pressure control floating cementing tool according to claim 4, characterized in that, each telescopic structure comprises a positioning rod and a second spring, one end of the positioning rod is in fixed connection with the closing plate, the other end of the positioning rod is in fixed connection with the fixed sleeve, the positioning rod is in T-shaped cross section, and the second spring covers the surface of the positioning rod.

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