High-strength float collar float shoe for drilling construction

Abstract

The invention relates to the field of well cementation equipment, in particular to a high-strength float collar float shoe for well drilling construction, which comprises an outer sleeve, an inner sleeve and the like, at least three groups of limiting strips are fixedly connected in the outer sleeve; at least three separation grooves and at least three groups of limiting grooves are formed in the outer circumferential surface of the inner sleeve; each separating groove is communicated with the corresponding group of limiting grooves; and each group of limiting grooves is matched with one group of limiting strips. The outer sleeve and the inner sleeve are in detachable rotary clamping connection, after grouting is finished, the valve body structure with the inner sleeve as a main body is detachable and can be reused subsequently, the cost is saved, meanwhile, a closed structure composed of the fixed sealing plate and the rotary sealing plate is arranged at the bottom of the outer sleeve, after the inner sleeve is taken out, slurry can be prevented from flowing backwards, and the grouting efficiency is improved. And normal operation of the grouting well cementation operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cementing equipment, in particular to a high-strength float collar float shoe for drilling construction. BACKGROUND

[0002] The float collar float shoe is a commonly used cementing tool, mainly composed of a shell, a valve seat, a valve core assembly and a buoyancy structure, etc. Its main function is to prevent mud from flowing backward when grouting downhole due to the pressure difference between the inside and outside of the grouting pipeline. The existing float collar float shoe cannot be taken out after completing the grouting operation in the well, and finally forms a wellbore structure with the cement slurry and the casing. The design of the float collar float shoe is a precision valve to prevent mud from flowing backward, which has a certain cost. After grouting is completed, the float collar float shoe cannot be taken out of the well. As a disposable tool, it causes waste of equipment resources and high construction cost. SUMMARY

[0003] In order to overcome the problem of equipment waste and high cost caused by the fact that most of the existing float collar float shoes are disposable and difficult to recover after grouting, the present application provides a high-strength float collar float shoe for drilling construction.

[0004] The technical scheme is: a high-strength float collar float shoe for drilling construction, comprising an outer sleeve and an inner sleeve sleeved inside the outer sleeve; further comprising a one-way valve assembly, a connecting assembly, a fixed sealing plate, a rotating sealing plate and a support strip; at least three sets of limiting strips are fixedly connected in the outer sleeve; at least three disengagement grooves and at least three sets of limiting grooves are formed on the outer circumference of the inner sleeve; each disengagement groove is in communication with a corresponding set of limiting grooves; each set of limiting grooves is matched with a set of limiting strips; the one-way valve assembly for preventing mud from flowing backward is connected in the inner sleeve; the connecting assembly for controlling the disengagement of the inner sleeve from the outer sleeve is connected; the fixed sealing plate is fixedly connected at the bottom of the outer sleeve; the rotating sealing plate is rotatably connected to the upper side of the fixed sealing plate; the flow-through port one is formed on the fixed sealing plate; the flow-through port two matched with the flow-through port one is formed on the rotating sealing plate; the connecting column is fixedly connected to the rotating sealing plate; the connecting column is inserted into the bottom of the inner sleeve; at least three support strips for improving the strength of the inner sleeve are rotatably connected in the outer sleeve; the top of each support strip protrudes outward to the center of the outer sleeve; each support strip is distributed in a ring shape, and the heights of the support strips are staggered; the support strips are embedded in the inner wall of the outer sleeve.

[0005] Further, the one-way valve assembly comprises: a flow-through seat, a mounting seat, a sliding rod, a ball valve and an elastic member; the flow-through seat is fixedly connected in the inner sleeve; the flow-through seat is a hollow cylinder, and the middle part is a mud passage; the mounting seat is installed in the inner sleeve; the mounting seat is located below the flow-through seat; the sliding rod is slidably connected to the mounting seat; the ball valve for blocking the passage of the flow-through seat is fixedly connected to the top of the sliding rod; the elastic member is connected between the ball valve and the mounting seat; and the elastic member is sleeved with the sliding rod.

[0006] Further, the connecting assembly comprises a connecting frame and a connecting rod; the inner sleeve top is fixedly connected with the connecting frame; the connecting frame is fixedly connected with a threaded column; the threaded column is threadedly connected with the connecting rod for disassembling the inner sleeve.

[0007] Further, the connecting column top is in the shape of a circular truncated cone, facilitating the insertion with the inner sleeve.

[0008] Further, the torsional spring is further included; the torsional spring for exerting a fixing force is connected between the fixed sealing plate and the rotating sealing plate.

[0009] Further, the cover sheet is further included; the cover sheet is fixedly connected to the inner sleeve top, preventing the mud from seeping between the outer sleeve and the inner sleeve.

[0010] Further, the closing cover is further included; the closing cover for protecting the torsional spring is fixedly connected to the rotating sealing plate top.

[0011] Further, the guiding inclined surface is processed on the edge of the limiting strip towards the side of the limiting groove, facilitating the clamping of the limiting strip into the limiting groove.

[0012] Further, the sealing gasket for enhancing the sealing property is fixedly connected to the bottom of the mud passage of the flow-through seat.

[0013] Further, the connecting thread for installing the guide shoe is arranged on the bottom of the outer sleeve.

[0014] The present application has the following advantages: the outer sleeve and the inner sleeve are in the detachable rotary clamping connection, the valve body structure with the inner sleeve as the main body is detachable after the grouting is completed, is repeatedly used subsequently, cost is saved, meanwhile, the closing structure composed of the fixed sealing plate and the rotating sealing plate is arranged on the bottom of the outer sleeve, the mud backflow is prevented after the inner sleeve is taken out, the normal grouting and well cementing operation is ensured; After the inner sleeve is taken out, the supporting strips are automatically turned downwards, the supporting strips are horizontally arranged in the outer sleeve, the outer sleeve is internally supported, the strength of the outer sleeve is improved, the deformation of the outer sleeve caused by the pressure is avoided, and the well cementing quality is affected; After the inner sleeve is taken out, the flow-through port one and the flow-through port two are misaligned and not connected, the bottom of the outer sleeve is closed, when the mud backflows, the torsional spring applies a reset torque to the rotating sealing plate, the relative position of the fixed sealing plate and the rotating sealing plate is limited, the rotation of the rotating sealing plate caused by the construction vibration is avoided, and the flow-through port one and the flow-through port two are connected. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the high-strength float collar float shoe for drilling construction; Figure 2 It is a sectional view of the outer sleeve; Figure 3 It is a schematic diagram of the internal structure of the high-strength float collar float shoe for drilling construction; Figure 4 An exploded view of the outer sleeve and the inner sleeve of the present invention; Figure 5 Schematic diagram of the three-dimensional structure of the fixed sealing plate and the rotating sealing plate of the present invention, with the rotating sealing plate being cross-sectionally processed; Figure 6 It is a top view of the support bar of the present invention in the downwardly turned state.

[0016] In the above drawings: 1-outer sleeve, 101-limiting strip, 2-inner sleeve, 201-circulation seat, 202-mounting seat, 203-sliding rod, 204-ball valve, 205-elastic member, 206-disengagement groove, 207-limiting groove, 208-cover plate, 3-connecting frame, 301-threaded column, 4-connecting rod, 5-fixed sealing plate, 501-circulation port 1, 502-torsion spring, 6-rotating sealing plate, 601-circulation port 2, 602-connecting column, 603-closing cover, 7-support bar. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0018] Example 1: A high-strength floating collar and floating shoe for drilling construction, such as Figures 1-6 As shown, it includes an outer sleeve 1 and an inner sleeve 2; the inner sleeve 2 is slidably connected to the outer sleeve 1; It also includes a one-way valve assembly, a connecting assembly, a fixed sealing plate 5, a rotating sealing plate 6 and a support bar 7; three groups of limit bars 101 are fixedly connected to the outer sleeve 1; three disengagement grooves 206 and three groups of limit grooves 207 are provided on the outer circumference of the inner sleeve 2; each disengagement groove 206 is connected to a corresponding group of limit grooves 207; each group of limit grooves 207 is adapted to a group of limit bars 101, and when the limit grooves 207 cooperate with the limit bars 101, the inner sleeve 2 is fixed in the outer sleeve 1; a one-way valve assembly is connected to the inner sleeve 2, and the one-way valve assembly is used to prevent mud backflow; a connecting assembly is connected to the top of the inner sleeve 2, and the inner sleeve 2 is rotated by the connecting assembly so that the limit bar 101 is aligned with the limit groove 207, so that the inner sleeve 2 can be disengaged from the outer sleeve 1 ; A fixed sealing plate 5 is fixedly connected to the bottom of the outer sleeve 1; a rotating sealing plate 6 is rotatably connected to the upper side of the fixed sealing plate 5; four flow ports 1 501 are provided on the fixed sealing plate 5; four flow ports 2 601 are provided on the rotating sealing plate 6, and the flow ports 2 601 are aligned with the flow ports 1 501 for mud circulation, and the flow ports 2 601 are misaligned with the flow ports 1 501 to prevent mud circulation; three connecting columns 602 are welded on the rotating sealing plate 6; the connecting columns 602 are plugged into the bottom of the inner sleeve 2; three support bars 7 are rotatably connected inside the outer sleeve 1; the top of each support bar 7 is set to protrude toward the center of the outer sleeve 1 for counterweight, and when the support bar 7 loses the restriction of the inner sleeve 2, it will automatically turn down; each support bar 7 is distributed in a ring shape and is highly staggered; the support bar 7 is embedded in the inner wall of the outer sleeve 1.

[0019] The one-way valve assembly includes: a circulation seat 201, a mounting seat 202, a slide rod 203, a ball valve 204 and an elastic member 205; the circulation seat 201 is fixedly connected to the inner upper side of the inner sleeve 2; the circulation seat 201 is a hollow cylinder with a mud channel in the middle; the mounting seat 202 is installed on the inner lower side of the inner sleeve 2; the slide rod 203 is slidably connected to the mounting seat 202; the ball valve 204 is welded on the top of the slide rod 203, the ball valve 204 is adapted to the channel of the circulation seat 201, and the bottom of the channel is blocked; an elastic member 205 is connected between the ball valve 204 and the mounting seat 202; the elastic member 205 is a spring; the elastic member 205 is sleeved on the slide rod 203.

[0020] The connecting assembly includes: a connecting frame 3 and a connecting rod 4; the connecting frame 3 is welded to the top of the inner sleeve 2; a threaded column 301 is welded to the center of the connecting frame 3; the threaded column 301 is threadedly connected to the connecting rod 4. After fixing the outer sleeve 1, rotating the connecting rod 4 in the direction of thread tightening can drive the inner sleeve 2 to rotate, thereby releasing the fixation of the inner sleeve 2 and the outer sleeve 1.

[0021] In order to facilitate plugging with the bottom of the inner sleeve 2, the top of the connecting column 602 is in a frustum shape.

[0022] Also include torsion spring 502; fixed sealing plate 5 and rotating sealing plate 6 between the connection torsion spring 502, flow port one 501 and flow port two 601 misregistration, torsion spring 502 is in the extension state, the fixed sealing plate 5 and rotating sealing plate 6 exert fixed force, keep the relative position of both.

[0023] Also include cover 208; in order to avoid the mud into the sleeve 1 and inner sleeve 2 between, the top of inner sleeve 2 is fixed with circular cover 208.

[0024] Also include closed cover 603; rotating sealing plate 6 top fixed with closed cover 603, isolation mud, protect torsion spring 502, so that it can work normally.

[0025] In order to facilitate the limiting strip 101 and limiting groove 207 butt joint, the edge of limiting strip 101 side towards limiting groove 207 is processed with guide slope.

[0026] Flow seat 201 mud channel bottom and ball valve 204 contact surface fixed with sealing pad, strengthen the sealing property when ball valve 204 is closed.

[0027] The bottom of outer sleeve 1 is provided with connecting thread, various types of guide shoes can be connected to the bottom of outer sleeve 1, and the casing pipe can be guided to be smoothly lowered into the well.

[0028] The use steps of the application are as follows: When assembling the application, the disengagement groove 206 of the inner sleeve 2 is aligned with the limiting strip 101 of the outer sleeve 1, then the inner sleeve 2 is put into the outer sleeve 1 downwards until the bottom of the inner sleeve 2 contacts the rotating sealing plate 6, the connecting column 602 is inserted into the bottom of the inner sleeve 2, at this time, the flow port one 501 and the flow port two 601 are misregistered and not connected; then the worker holds the connecting frame 3 and rotates the inner sleeve 2, so that the limiting strip 101 enters the limiting groove 207 from the disengagement groove 206, the inner sleeve 2 is locked and cannot be separated upwards from the outer sleeve 1; while rotating the inner sleeve 2, the connecting column 602 connected thereto drives the rotating sealing plate 6 to rotate, so that the flow port one 501 and the flow port two 601 are aligned and connected, then the connecting rod 4 is screwed with the threaded column 301, and the outer sleeve 1 is screwed at the top of the pipeline outlet for pumping mud, the connecting rod 4 extends in the pipeline, and the top of the connecting rod 4 is lower than the pipeline inlet; then the outer sleeve 1 and the pipeline are lowered into the well together, the mud injection and well cementation are carried out by connecting the pump to the pipeline inlet, the mud is pumped from the pipeline into the outer sleeve 1, flows downwards in the inner part of the flow seat 201, pushes the ball valve 204 to open downwards, and compresses the elastic member 205, the mud passes through the flow port one 501 and the flow port two 601 downwards, and is injected into the well from the bottom of the outer sleeve 1.

[0029] After the grouting is completed, the pipeline stops pumping the slurry, the ball valve 204 loses the pressure of the slurry, the elastic member 205 is stretched to push the ball valve 204 to move upward to reset, block the flow-through seat 201, then the pump and the pipeline are disconnected, the worker puts his hand into the pipeline from the inlet, holds and rotates the connecting rod 4 in the direction of screwing the threaded column 301, drives the connecting frame 3 and the inner sleeve 2 to rotate, so that the limiting strip 101 is re-aligned with the disengagement groove 206, then the worker pulls the connecting rod 4 upward, pulls the inner sleeve 2 out of the outer sleeve 1 upward, and moves upward along the inside of the grouting pipeline (it should be noted that the outer diameter of the inner sleeve 2 is smaller than the grouting pipeline, so it will not be hindered by the residual slurry in the grouting pipeline), until the inner sleeve 2 is taken out; when the inner sleeve 2 rotates, the connecting column 602 inserted therein drives the rotating sealing plate 6 to rotate, so that the flow-through opening one 501 and the flow-through opening two 601 are misaligned and not connected, the bottom of the outer sleeve 1 is closed, and the slurry cannot flow backward.

[0030] When the inner sleeve 2 is pulled out of the outer sleeve 1, the support strips 7 vertically embedded in the inner wall of the outer sleeve 1 will lose the block of the inner sleeve 2, and the top of the support strips 7 protrudes outward to the center of the outer sleeve 1 to counterbalance, so that the support strips 7 are turned downward to a horizontal state under the action of gravity, the top of the support strips 7 is in contact with the inner wall of the outer sleeve 1, and each support strip 7 is transversely arranged in the outer sleeve 1 to internally support the outer sleeve 1.

[0031] It should be noted that when the inner sleeve 2 is installed in the outer sleeve 1, the outer sleeve 1 is inverted and then the inner sleeve 2 is installed, and when the outer sleeve 1 is inverted, the support strips 7 will be vertically embedded in the inner wall of the outer sleeve 1 under the action of gravity.

[0032] When the inner sleeve 2 drives the rotating sealing plate 6 to rotate so that the flow-through opening one 501 and the flow-through opening two 601 are aligned and connected, the rotating sealing plate 6 will compress the torsional spring 502, and when the inner sleeve 2 drives the rotating sealing plate 6 to rotate so that the flow-through opening one 501 and the flow-through opening two 601 are misaligned and not connected, the torsional spring 502 returns to its original position and applies pressure to the fixed sealing plate 5 and the rotating sealing plate 6 after the inner sleeve 2 is taken out, so as to limit the relative position of the fixed sealing plate 5 and the rotating sealing plate 6 and keep the flow-through opening one 501 and the flow-through opening two 601 misaligned and not connected.

[0033] According to the above steps, the present application has the following effects: The existing float collar and float shoe are disposable, and cannot be taken out of the well after grouting, which causes waste of equipment resources and high construction cost; the outer sleeve 1 and the inner sleeve 2 of the present application are detachably connected in a rotating clamping manner, the inner sleeve 2 which is the main body of the valve structure can be detached after grouting, and can be reused subsequently, thereby saving cost, and the fixed sealing plate 5 and the rotating sealing plate 6 are arranged at the bottom of the outer sleeve 1 in a closed structure, which can prevent the slurry from flowing backward after the inner sleeve 2 is taken out, and ensure the normal operation of the grouting and well cementing operation.

[0034] After the inner sleeve 2 is taken out, the support strips 7 automatically turn down and are horizontally arranged in the outer sleeve 1 to internally support the outer sleeve 1, improve the strength of the outer sleeve 1, avoid deformation of the outer sleeve 1 caused by pressure, and affect the cementing quality.

[0035] After the inner sleeve 2 is taken out, the flow-through port one 501 and the flow-through port two 601 are misaligned and not connected, the bottom of the outer sleeve 1 is closed, the torsional spring 502 is restored when the mud is poured back, pressure is applied to the fixed sealing plate 5 and the rotating sealing plate 6, the relative positions of the fixed sealing plate 5 and the rotating sealing plate 6 are limited, the flow-through port one 501 and the flow-through port two 601 are misaligned and not connected, and the rotating sealing plate 6 is prevented from rotating due to construction vibration, so that the flow-through port one 501 and the flow-through port two 601 are connected.

[0036] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A floating collar and a floating shoe for high-strength drilling construction, comprising an outer sleeve (1) and an inner sleeve (2) sleeved therein; wherein: The invention also includes a one-way valve assembly, a connecting assembly, a fixed sealing plate (5), a rotating sealing plate (6) and a supporting bar (7); at least three groups of limit bars (101) are fixedly connected to the outer sleeve (1); at least three disengagement grooves (206) and at least three groups of limit grooves (207) are provided on the outer circumferential surface of the inner sleeve (2); each disengagement groove (206) is communicated with a corresponding group of limit grooves (207); each group of limit grooves (207) is matched with a group of limit bars (101); a one-way valve assembly for preventing mud from flowing back is connected to the inner sleeve (2); the inner sleeve (2) is connected to a connecting assembly for controlling its separation from the outer sleeve (1); the bottom of the outer sleeve (1) is fixedly connected to A fixed sealing plate (5); a rotating sealing plate (6) is rotatably connected to the upper side of the fixed sealing plate (5); a first flow opening (501) is provided on the fixed sealing plate (5); a second flow opening (601) adapted to the first flow opening (501) is provided on the rotating sealing plate (6); a connecting column (602) is fixedly connected to the rotating sealing plate (6); the connecting column (602) is plugged into the bottom of the inner sleeve (2); at least three support bars (7) for improving the internal strength of the outer sleeve (1) are rotatably connected to the inner side of the outer sleeve (1); the top of each support bar (7) protrudes toward the center of the outer sleeve (1); the support bars (7) are distributed in an annular shape and are staggered in height; the support bars (7) are embedded in the inner wall of the outer sleeve (1).

2. A high-strength floating collar and floating shoe for drilling construction according to claim 1, characterized in that: The one-way valve assembly comprises: a circulation seat (201), a mounting seat (202), a slide rod (203), a ball valve (204) and an elastic member (205); the circulation seat (201) is fixedly connected in the inner sleeve (2); the circulation seat (201) is a hollow cylinder, and its inner cavity constitutes a mud channel; the mounting seat (202) is installed in the inner sleeve (2); the mounting seat (202) is located below the circulation seat (201); the slide rod (203) is slidably connected to the mounting seat (202); the ball valve (204) for blocking the channel of the circulation seat (201) is fixedly connected to the top of the slide rod (203); an elastic member (205) is provided between the ball valve (204) and the mounting seat (202), and the elastic member (205) always applies an upward elastic force to the slide rod (203); the elastic member (205) is sleeved with the slide rod (203).

3. A high-strength floating collar and floating shoe for drilling construction according to claim 2, characterized in that: The connection assembly comprises: a connection frame (3) and a connection rod (4); the top of the inner sleeve (2) is fixedly connected to the connection frame (3); the connection frame (3) is fixedly connected to a threaded column (301); the threaded column (301) is threadedly connected to the connection rod (4) for disassembling the inner sleeve (2).

4. A high-strength floating collar and floating shoe for drilling construction according to claim 3, characterized in that: The top of the connecting column (602) is in the shape of a truncated cone, which is convenient for plugging into the inner sleeve (2).

5. A high-strength floating collar and floating shoe for drilling construction according to any one of claims 1 to 4, characterized in that: It also includes a torsion spring (502); a torsion spring (502) is provided between the fixed sealing plate (5) and the rotating sealing plate (6), and the torsion spring (502) is used to automatically reset the rotating sealing plate (6) to a position that closes the flow port 1 (501).

6. The high-strength floating collar and floating shoe for drilling construction according to claim 1 is characterized in that: It also includes a cover plate (208); the cover plate (208) is fixed to the top of the inner sleeve (2) to prevent mud from seeping into between the outer sleeve (1) and the inner sleeve (2).

7. The high-strength floating collar and floating shoe for drilling construction according to claim 5 is characterized in that: It also includes a closing cover (603); the closing cover (603) is fixedly connected to the top of the rotating sealing plate (6) with a protective torsion spring (502).

8. The high-strength floating collar and floating shoe for drilling construction according to claim 7 is characterized in that: A guide bevel is processed on one side edge of the limiting strip (101) facing the limiting groove (207) to facilitate the limiting strip (101) to be inserted into the limiting groove (207).

9. The high-strength floating collar and floating shoe for drilling construction according to claim 8, characterized in that: A sealing gasket for enhancing airtightness is fixedly connected to the bottom of the mud channel of the circulation seat (201).

10. The high-strength floating collar and floating shoe for drilling construction according to claim 7, characterized in that: The bottom of the outer sleeve (1) is provided with a threaded interface for connecting the guide shoe.

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