Drilling-plug-free well cementation tool capable of preventing water slurry from flowing backwards
By designing a drill-free plug-free cementing tool including packer, shunt and blocking loop, the existing tools solve the problems of blind plate shedding and mud backflow during large tonnage impact, achieving higher safety and reliability.
Patent Information
- Application Number
- CN202510053889.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-04-11
AI Technical Summary
The existing drill-free plug-in cementing tools are prone to falling off when they are impacted by large tonnage, and are prone to mud backflow, which is not very safe.
A drill-free plug-in cementing tool including a packer, a shunt, a first-stage blocking loop, a second-stage blocking loop, a third-stage blocking loop and a pressurized plug is designed. Unlocking the scissors by fixing the limit locking pins to ensure that the blind plate does not fall off during impact; the third-level blocking ring prohibits the cement slurry from pouring back, and automatically closes the circulation channel after impact.
It effectively prevents mud from pouring back, ensures that the blind plate does not fall off during large tonnage impact, and improves the safety and reliability of the tool.
Smart Images
Figure CN119801442A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of drilling, in particular to a drilling-free cementing tool for preventing cement slurry backflow. Background Art
[0002] Existing drill-free cementing tools have the following disadvantages: (1) when subjected to large-tonnage impact force, the blind plate will fall off and fail, thereby affecting the speed below the casing; (2) mud backflow is likely to occur during the operation, and safety cannot be guaranteed. Summary of the invention
[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a drill-free cementing tool that can prevent mud backflow, which can ensure that the blind plate will not fall off when subjected to large-tonnage impact, and at the same time effectively prevent mud backflow, is safe and reliable, and can effectively solve the problems in the background technology.
[0004] To achieve the above object, the present invention provides the following technical solutions: a drilling-plug-free cementing tool for preventing cement slurry backflow, comprising a packer, a diverter, a primary blocking ring, a secondary blocking ring, a tertiary blocking ring and a pressure rubber plug;
[0005] The packer is arranged on the outer side of one end of the diverter, the outer side of the diverter is provided with a packer shield, the packer shield contacts the inner side of the packer, the other end of the packer is connected to the casing screen, the other end of the diverter is connected to the lifting short section, and the lifting short section is connected to the cementing casing;
[0006] A three-stage flow-blocking ring is symmetrically mounted inside the packer shield, one end of the three-stage flow-blocking ring is connected to a potential energy spring through a push rod, and the potential energy spring is located in the energy accumulator;
[0007] The flow divider is provided with a rubber plug cylinder inside, the rubber plug cylinder is threadedly connected with a flow blocking seat, one end of the flow blocking seat is connected to the secondary flow blocking ring through the secondary flow blocking ring pressure limiting shear pin, one end of the secondary flow blocking ring is connected to the secondary flow blocking ring spring, and the secondary flow blocking ring spring is fixed to the other end of the flow blocking seat;
[0008] The primary blocking ring is arranged inside the secondary blocking ring, and one end of the primary blocking ring is connected to the inside of the secondary blocking ring through the primary blocking ring spring I and the primary blocking ring spring II;
[0009] The impact-pressure rubber plug is movably connected in the rubber plug cylinder.
[0010] As a preferred technical solution of the present invention, the packer and the diverter are connected via threads.
[0011] As a preferred technical solution of the present invention, the stopper tube is fixed in the diverter by a limit lock pin, and the limit lock pin fixes the stopper tube and the diverter through a slip seat, and a slip tooth is provided on the inner side surface of one end of the slip seat.
[0012] As a preferred technical solution of the present invention, the internal thread of the slip seat is connected with a retaining ring, and the retaining ring is located on the head side of the primary flow blocking ring.
[0013] As a preferred technical solution of the present invention, the slip seat is fixed on the rubber plug cylinder by an unlocking pin and a salvage shear pin.
[0014] As a preferred technical solution of the present invention, the head of the primary spoiler ring is arranged in a fixed spoiler plate, the fixed spoiler plate is arranged on one side of the secondary spoiler ring, and an elastic retaining ring is arranged between the fixed spoiler plate and the secondary spoiler ring.
[0015] As a preferred technical solution of the present invention, a fixing pin passes through the plug tube and the diverter.
[0016] As a preferred technical solution of the present invention, the inner side surface of one end of the rubber stopper tube is connected to the centralizer through shear nails, and a fifth rubber ring is provided between the centralizer and the rubber stopper tube.
[0017] As a preferred technical solution of the present invention, the lifting nipple is connected to the cementing casing via a coupling.
[0018] As a preferred technical solution of the present invention, a first rubber ring is arranged between the plug tube and the diverter, a second rubber ring is arranged between the packer shield and the diverter, a third rubber ring is arranged between the packer shield and the third-level blocking ring, and a fourth rubber ring is arranged between the second-level blocking ring and the plug tube.
[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) a limit lock pin is used to fix the shear pin unlocking, so that when subjected to impact, the casing lowering speed is not affected, and the blind plate will not fall off and fail when subjected to large-tonnage impact force; (2) the three-level blocking ring prohibits the backflow of cement slurry. After impact and pressure, the blocking ring automatically closes the circulation channel, and the cement slurry will not flow back, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of the present invention;
[0021] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;
[0022] Figure 3 is a schematic diagram of the structure of the packer;
[0023] Figure 4It is a structural schematic diagram of the impact-pressure rubber plug;
[0024] Figure 5 It is a structural schematic diagram of the packer in the sealing state;
[0025] Figure 6 It is a schematic diagram of the opening state of the secondary blocking ring and the tertiary blocking ring;
[0026] Figure 7 It is a schematic diagram of the state where the primary blocking ring, the secondary blocking ring and the tertiary blocking ring are closed at the same time;
[0027] Figure 8 This is a schematic diagram of the limit lock pin retracted state;
[0028] Fig. 9 Schematic diagram of the wellbore completion status after salvage.
[0029] In the figure: 1 packer, 2 baffle seat, 3 secondary baffle spring, 4 primary baffle ring spring I, 5 primary baffle ring spring II, 6 secondary baffle ring pressure limiting shear nail, 7 rubber plug tube, 8 packer shield, 9 primary baffle ring, 10 first rubber ring, 11 fixing pin, 12 diverter, 13 second rubber ring, 14 third rubber ring, 15 third baffle ring, 16 secondary baffle ring, 17 fourth rubber ring, 18 elastic retaining ring, 19 fixed baffle plate, 20 energy accumulator, 21 push rod, 22 retaining ring, 23 slip seat, 24 unlocking pin, 25 salvage shear nail, 26 potential energy spring, 27 limit locking pin, 28 slip tooth, 29 fifth rubber ring, 30 shear nail, 31 centralizer, 32 fifth rubber ring, 33 lifting short joint, 34 coupling, 35 impact rubber plug. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0031] See also Figure 1-4 The present invention provides a technical solution: a drilling-plug-free cementing tool for preventing cement slurry backflow, comprising a packer 1, a diverter 12, a primary blocking ring 9, a secondary blocking ring 16, a tertiary blocking ring 15 and a collision rubber plug 35;
[0032] The packer 1 is arranged on the outer side of one end of the diverter 12, a rubber tube is arranged on the packer 1, and a packer shield 8 is arranged on the outer side of the diverter 12, the packer shield 8 corresponds to the position of the rubber tube on the packer 1, and the pressure is transmitted between the packer 1 and the separator 12 through the packer shield 8, the other end of the packer 1 is connected to the casing screen, the other end of the diverter 12 is connected to the lifting short section 33, and the lifting short section 33 is connected to the cementing casing;
[0033] A three-stage flow-blocking ring 15 is symmetrically mounted inside the packer shield 8. One end of the three-stage flow-blocking ring 15 is connected to a potential energy spring 26 through a push rod 21. The potential energy spring 26 is located in the energy accumulator 20. When there is no pressure, the three-stage flow-blocking ring 15 is always in a closed state under the action of the push rod 26 and the potential energy spring 26.
[0034] The flow divider 12 is provided with a rubber plug cylinder 7, the rubber plug cylinder 7 is internally threadedly connected with a flow blocker 2, one end of the flow blocker 2 is connected to a secondary flow blocker 16 through a secondary flow blocker ring pressure limiting shear pin 6, one end of the secondary flow blocker 16 is connected to a secondary flow blocker ring spring 3, and the secondary flow blocker ring spring 3 is fixed to the other end of the flow blocker 2, and the secondary flow blocker ring 16 always keeps the circulation channel closed when there is no pressure.
[0035] The primary baffle ring 9 is arranged in the secondary baffle ring 16, and one end of the primary baffle ring 9 is connected to the inside of the secondary baffle ring 16 through the primary baffle ring spring I4 and the primary baffle ring spring II5. When there is no pressure, the head of the primary baffle ring 9 is arranged in the fixed baffle plate 19, and the fixed baffle plate 19 is arranged on one side of the secondary baffle ring 16. When there is no pressure acting on the primary baffle ring spring I4 and the primary baffle ring spring II5, the circulation channel of the fixed baffle plate 19 is always closed;
[0036] The impact rubber plug 35 is movably connected in the rubber plug tube 7;
[0037] The stopper tube 7 is fixed in the diverter 12 by a limit lock pin 27. The limit lock pin 27 fixes the stopper tube 7 and the diverter 12 through a slip seat 23. A slip tooth 28 is provided on the inner side surface of one end of the slip seat 23. The slip seat 23 is internally threaded with a retaining ring 22. The retaining ring 22 is located on the head side of the primary blocking ring 9. The slip seat 23 is fixed to the stopper tube 7 by an unlocking pin 24 and a salvage shear pin 25. The movement of the limit lock pin 27 is limited by setting the slip seat 23.
[0038] In order to facilitate installation and removal of the packer 1, the packer 1 and the diverter 12 are connected by threads.
[0039] In order to improve the sealing performance, an elastic retaining ring 18 is provided between the fixed spoiler 19 and the secondary spoiler ring 16 .
[0040] In order to prevent the diverter 12 and the plug tube 7 from rotating, a fixing pin 11 passes between the plug tube 7 and the diverter 12 .
[0041] In order to prevent the plug tube 7 from being unable to align with the impact plug 35, the inner side surface of one end of the plug tube 7 is connected to the centralizer 31 through a shear nail 30, and a fifth rubber ring 32 is provided between the centralizer 31 and the plug tube 7. When the impact plug 35 is pressed, the shear nail 30 and the centralizer 31 play a centralizing role.
[0042] In order to improve the connection stability, the lifting sub 33 and the cementing casing are connected via a coupling 34 .
[0043] In order to improve the overall sealing of the tool, a first rubber ring 10 is arranged between the plug tube 7 and the diverter 12, a second rubber ring 13 is arranged between the packer shield 8 and the diverter 12, a third rubber ring 14 is arranged between the packer shield 8 and the third-level blocking ring 15, and a fourth rubber ring 17 is arranged between the second-level blocking ring 16 and the plug tube 7.
[0044] like Figure 5 When the packer 1 needs to be sealed, the primary blocking ring 9 opens the circulation channel under pressure, and the liquid enters the packer 1 through the packer sealing circulation channel under pressure, and the packer 1 expands;
[0045] like Figure 6 After the packer 1 is sealed, the surface pump truck continues to pump and the pressure increases. At this time, the secondary blocking ring 16 and the tertiary blocking ring simultaneously open the circulation channel to establish cement slurry circulation cementing;
[0046] like Figure 7 After the ancient well is completed, the cement slurry is pushed to the bottom of the attack under the action of the impact rubber plug 35 and the impact is completed. At this time, the first-level blocking ring 9, the second-level blocking ring 16, and the third-level blocking ring 15 are closed at the same time under the action of the second-level blocking ring spring 3, the first-level blocking ring spring I4, the first-level blocking ring spring II5 and the push rod 21;
[0047] like Figure 8 After the collision and compression of the impact rubber plug 35 is completed and the pressure waiting time is up, the impact rubber plug 35 is salvaged with a spear. When the spear salvages the impact rubber plug 35, the impact rubber plug 35 drives the slip teeth 28 to move, and then drives the slip seat 23 to move, and the slip seat 23 and the retaining ring 22 cut off the salvage shear nails 25 until the slip seat 23 moves to the position of the unlocking pin 24, and the limit lock pin 27 is retracted;
[0048] like Fig. 9 After the limit lock pin 27 is retracted, the rubber plug tube 7 and all the internal structural parts are not fixed by any device, and the well is salvaged out of the wellbore and completed under the lifting force of the salvage spear.
[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A drilling-free cementing tool for preventing backflow of cement slurry, characterized in that: It comprises a packer (1), a flow diverter (12), a primary flow blocking ring (9), a secondary flow blocking ring (16), a tertiary flow blocking ring (15) and a pressure rubber plug (35); The packer (1) is arranged on the outer side of one end of the diverter (12); the outer side of the diverter (12) is provided with a packer shield (8); the packer shield (8) contacts the inner side of the packer (1); the other end of the packer (1) is connected to the casing screen; the other end of the diverter (12) is connected to the lifting short section (33); and the lifting short section (33) is connected to the cementing casing; A three-stage flow blocking ring (15) is symmetrically mounted inside the packer shield (8), one end of the three-stage flow blocking ring (15) is connected to a potential energy spring (26) via a push rod (21), and the potential energy spring (26) is located in the energy accumulator (20); The flow divider (12) is provided with a rubber plug tube (7) inside, the rubber plug tube (7) is connected to a flow blocking seat (2) through an internal thread, one end of the flow blocking seat (2) is connected to a secondary flow blocking ring (16) through a secondary flow blocking ring pressure limiting shear pin (6), one end of the secondary flow blocking ring (16) is connected to a secondary flow blocking ring spring (3), and the secondary flow blocking ring spring (3) is fixed to the other end of the flow blocking seat (2); The primary blocking ring (9) is arranged inside the secondary blocking ring (16), and one end of the primary blocking ring (9) is connected to the inside of the secondary blocking ring (16) via a primary blocking ring spring I (4) and a primary blocking ring spring II (5); The impact rubber plug (35) is movably connected in the rubber plug cylinder (7).
2. A drilling-free cementing tool for preventing backflow of cement slurry according to claim 1, characterized in that: The packer (1) and the diverter (12) are connected via threads.
3. A drilling-free cementing tool for preventing backflow of cement slurry according to claim 1, characterized in that: The stopper tube (7) is fixed in the diverter (12) via a limit lock pin (27), and the limit lock pin (27) fixes the stopper tube (7) and the diverter (12) via a slip seat (23), and a slip tooth (28) is provided on the inner side surface of one end of the slip seat (23).
4. A drilling-free cementing tool for preventing backflow of cement slurry according to claim 3, characterized in that: The slip seat (23) is internally threadedly connected with a retaining ring (22), and the retaining ring (22) is located at one side of the head of the primary flow blocking ring (9).
5. The drilling-free cementing tool for preventing backflow of cement slurry according to claim 3 is characterized in that: The slip seat (23) is fixed on the rubber plug tube (7) via an unlocking pin (24) and a salvage shear pin (25).
6. The drilling-free cementing tool for preventing backflow of cement slurry according to claim 1, characterized in that: The head of the primary spoiler ring (9) is arranged in a fixed spoiler plate (19), the fixed spoiler plate (19) is arranged on one side of the secondary spoiler ring (16), and an elastic retaining ring (18) is arranged between the fixed spoiler plate (19) and the secondary spoiler ring (16).
7. The drilling-free cementing tool for preventing backflow of cement slurry according to claim 1 is characterized in that: A fixing pin (11) passes between the rubber plug tube (7) and the diverter (12).
8. The drilling-free cementing tool for preventing backflow of cement slurry according to claim 1, characterized in that: The inner side surface of one end of the rubber plug tube (7) is connected to the centralizer (31) via a shear nail (30), and a fifth rubber ring (32) is provided between the centralizer (31) and the rubber plug tube (7).
9. The drilling-free cementing tool for preventing backflow of cement slurry according to claim 1, characterized in that: The lifting nipple (33) is connected to the cementing casing via a coupling (34).
10. The drilling-free cementing tool for preventing backflow of cement slurry according to claim 1, characterized in that: A first rubber ring (10) is arranged between the rubber stopper tube (7) and the diverter (12), a second rubber ring (13) is arranged between the packer shield (8) and the diverter (12), a third rubber ring (14) is arranged between the packer shield (8) and the third-level blocking ring (15), and a fourth rubber ring (17) is arranged between the second-level blocking ring (16) and the rubber stopper tube (7).