Hydraulic large-drift-diameter cement retainer

Abstract

The utility model provides a hydraulic type large-drift-diameter cement bearing and retaining device. The retaining device comprises a hydraulic setting mechanism and a retaining device body, and the hydraulic setting mechanism comprises an upper connector, an upper center pipe, an outer sleeve, an upper piston, a sealing spacer ring, a lower piston, a push cylinder, a center pipe sealing assembly, a lower center pipe, a ball seat, a steel ball, a fixing pin, a control pin, a sealing piece, an upper liquid inlet, an upper hydraulic cavity, a lower liquid inlet and a lower hydraulic cavity. The retainer body comprises a body center pipe, an upper slip, a lower slip, an upper cone, an expansion ring, a compression type rubber sleeve, a lower cone, a lower sleeve and a petal type one-way valve assembly. The bottom valve mechanism has the advantages that the bottom valve mechanism is not eroded, the closing performance is reliable, the squeezing channel is large, safe, large-displacement and accurate squeezing operation can be guaranteed, and the construction efficiency and quality of squeezing plugging operation are improved.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas well repair and squeezing plugging operations, and in particular to a hydraulic large-diameter cement retainer. Background Art

[0002] Most domestic oil and gas fields are in the middle to late stages of development. Issues such as plugging water-producing zones and plugging and abandoning long-stopped wells have led to a continuous increase in cement injection workload. During actual injection operations, the bottom valve's opening and closing performance is unstable and susceptible to erosion by the injected fluid, leading to bottom valve failure, seriously impacting the success rate and quality of the injection operation. Furthermore, the existing cement retainer's injection channel is relatively small, limiting the injection volume during large-scale injection operations and hindering efficiency. Utility Model Content

[0003] The present invention aims to solve at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the present invention is to provide a large-diameter hydraulic cement retainer that is easy to operate, has a stable structure, has a good bottom valve performance, and has a large diameter.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a hydraulic large-diameter cement retainer.

[0005] The hydraulic large-diameter cement retainer may include: an upper joint, an upper center tube and a lower center tube connected in sequence, an outer sleeve and a push tube sleeved on the upper center tube and connected up and down, an upper piston located between the upper center tube and the outer sleeve and connected to the upper end of the push tube, a lower piston located between the upper center tube and the push tube, a sealing spacer located between the upper piston and the lower piston and sleeved on the upper center tube, and a ball seat arranged in the inner hole at the lower end of the upper center tube; wherein, an upper hydraulic chamber is formed between the upper joint, the upper center tube, the upper piston and the outer sleeve, a lower hydraulic chamber is formed between the lower piston, the push tube, the sealing spacer and the upper center tube, an upper liquid inlet hole and a lower liquid inlet hole penetrating the inner and outer walls are opened on the upper center tube, the upper liquid inlet hole is communicated with the upper hydraulic chamber, and the lower liquid inlet hole is communicated with the lower hydraulic chamber;

[0006] The retainer body includes: a body center tube and a lower sleeve connected to each other, a flap-type one-way valve assembly, and an upper slip, an upper cone, a rubber sleeve, a lower cone and a lower slip sequentially sleeved on the body center tube;

[0007] Furthermore, the retainer body further includes a first expansion ring and a second expansion ring, the first expansion ring is arranged between the upper vertebral body and the rubber cylinder, and the second expansion ring is arranged between the lower vertebral body and the rubber cylinder.

[0008] Furthermore, the upper joint is threadedly connected to the upper central tube, and the upper central tube is threadedly connected to the lower central tube.

[0009] Furthermore, the ball seat is fixed in the inner hole of the lower end of the upper center tube by a control pin.

[0010] Furthermore, a sealing assembly is provided at the connection between the upper joint and the upper central pipe.

[0011] Furthermore, a fastening screw is provided at the connection of the outer sleeve of the upper joint to prevent the buckle from coming off, and the lower end of the outer sleeve is connected to the push cylinder through a control pin.

[0012] Furthermore, a diameter-changing step is provided inside the push cylinder, and a limiting lower piston is installed in the step.

[0013] Furthermore, the upper slip is provided with evenly distributed circular holes in the circumference, corresponding to the control pins connecting the main body center tube and the upper center tube.

[0014] Furthermore, the central tube of the body is connected to a locking ratchet ring through a ratchet thread, and the locking ratchet ring is C-shaped.

[0015] Furthermore, a sealing assembly is installed at the connection between the upper central tube and the lower central tube, and the sealing assembly is composed of a plurality of V-shaped sealing members installed and assembled.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The utility model has a stable structure and is easy to operate.

[0018] (2) The bottom valve designed in the present invention has good performance, the bottom valve mechanism is not subject to erosion, and can improve the construction success rate and construction quality.

[0019] (3) The extrusion channel of the utility model is straight and has a large diameter, which can expand the construction scale, improve the safety of the sealing operation, and improve the efficiency of the construction operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects and / or features of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A structural schematic diagram of an exemplary embodiment of a hydraulic large-diameter cement retainer of the present invention is shown.

[0022] Description of main reference numerals:

[0023] 1-upper joint, 2-upper center tube, 3-outer sleeve, 4-upper piston, 5-sealing spacer, 6-lower piston, 7-center tube sealing assembly, 8-lower center tube, 9-ball seat, 10-fixing pin, 11-control pin, 12-seal, 13-center tube of the main body, 14-upper slip, 15-upper vertebral body, 16-expansion ring A, 17-expansion ring B, 18-compression rubber cylinder, 19-lower vertebral body, 20-lower slip, 21-lower sleeve, 22-flap type one-way valve assembly, 23-push cylinder, 24-steel ball, 25-center extrusion channel, 26-upper hydraulic chamber, 27-upper liquid inlet, 28-lower hydraulic chamber, 29-lower liquid inlet, 30-locking ratchet ring. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the utility model. Obviously, the embodiments described are only some of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Exemplary embodiment 1

[0026] The present exemplary embodiment provides a hydraulic large-diameter cement retainer.

[0027] The hydraulic large-diameter cement retainer includes: a hydraulic setting mechanism and a retainer body.

[0028] The hydraulic setting mechanism includes: an upper joint, an upper center tube and a lower center tube connected in sequence, an outer sleeve and a push tube sleeved on the upper center tube and connected up and down, an upper piston located between the upper center tube and the outer sleeve and connected to the upper end of the push tube, a lower piston located between the upper center tube and the push tube, a sealing ring located between the upper piston and the lower piston and sleeved on the upper center tube, and a ball seat set in the inner hole at the lower end of the upper center tube;

[0029] Among them, an upper hydraulic chamber is formed between the upper joint, the upper center tube, the upper piston and the outer sleeve;

[0030] A lower hydraulic chamber is formed between the lower piston, the push cylinder, the sealing spacer ring and the upper center tube;

[0031] The upper central tube is provided with an upper liquid inlet hole and a lower liquid inlet hole penetrating the inner and outer walls; the upper liquid inlet hole is connected to the upper hydraulic chamber, and the lower liquid inlet hole is connected to the lower hydraulic chamber;

[0032] The retainer body includes: a body center tube and a lower sleeve connected to each other, a flap-type one-way valve assembly, and an upper slip, an upper cone, a rubber sleeve, a lower cone and a lower slip sequentially sleeved on the body center tube;

[0033] Among them, the main body center tube is sleeved on the upper center tube and the lower center tube, and is connected to the upper center tube; the lower sleeve and the lower center tube form an installation space, and the flap-type one-way valve assembly is located in the installation space.

[0034] In this embodiment, the retainer body further includes a first expansion ring and a second expansion ring. The first expansion ring is arranged between the upper vertebral body and the rubber cylinder, and the second expansion ring is arranged between the lower vertebral body and the rubber cylinder.

[0035] In this embodiment, the upper joint and the upper central tube can be threadedly connected, and the upper central tube and the lower central tube can be threadedly connected.

[0036] In this embodiment, the ball seat can be fixed in the inner hole of the lower end of the upper central tube by a control pin.

[0037] In this embodiment, a sealing assembly is provided at the connection between the upper joint and the upper center tube, and the lower end of the outer sleeve can be connected to the push cylinder through a control pin.

[0038] In this embodiment, a sealing assembly is provided at the connection between the upper joint and the upper central pipe.

[0039] In this embodiment, a fastening screw is provided at the connection between the upper joint and the outer sleeve to prevent the buckle from falling off.

[0040] In this embodiment, a diameter-changing step is provided inside the push cylinder, and a limit lower piston is installed in the step.

[0041] In this embodiment, the upper slips are provided with evenly distributed circular holes in the circumference, corresponding to the control pins connecting the main body center tube and the upper center tube.

[0042] In this embodiment, the central tube of the body is connected to the locking ratchet ring through a ratchet thread, and the locking ratchet ring is C-shaped.

[0043] In this embodiment, a sealing assembly is installed at the connection between the upper central tube and the lower central tube. The sealing assembly is composed of a plurality of V-shaped sealing members assembled together.

[0044] In order to better understand the above exemplary embodiments, they are further described below in conjunction with specific embodiments.

[0045] Example 1

[0046] Figure 1 A structural schematic diagram of an exemplary embodiment of a hydraulic large-diameter cement retainer of the present utility model is shown.

[0047] The following combination Figure 1 This embodiment will be described.

[0048] The illustrated drop-drillable bottom packer may include:

[0049] Upper joint 1, upper center tube 2, outer sleeve 3, upper piston 4, sealing spacer 5, lower piston 6, center tube sealing assembly 7, lower center tube 8, ball seat 9, fixing pin 10, control pin 11, seal 12, center tube of main body 13, upper slip 14, upper vertebral body 15, expansion ring A16, expansion ring B17, compression rubber cylinder 18, lower vertebral body 19, lower slip 20, lower sleeve 21, flap type one-way valve assembly 22, push cylinder 23, steel ball 24, center extrusion channel 25, upper hydraulic chamber 26, upper liquid inlet 27, lower hydraulic chamber 28, lower liquid inlet 29, locking ratchet ring 30.

[0050] The internal thread at the lower end of the upper joint 1 is connected to the upper central pipe 2. The inner hole at the lower end of the upper central pipe 2 is connected to the ball seat 9 via a control pin 11. A steel ball 24 is placed above the ball seat 9 to temporarily block the central injection channel 25. A central pipe sealing assembly installation position is provided on the outer side of the lower end of the upper central pipe 2 for installing the central pipe sealing assembly 7. Below the sealing assembly installation position is an external connecting thread for connecting to the lower central pipe 8. The upper central pipe 2 and the lower central pipe 8 are connected to form the central injection channel 25. After the pressure in the pipe increases and the control pin 11 is sheared off, the ball seat 9 and the steel ball 24 fall directly into the well, ensuring that the central injection channel 25 is full-diameter, providing favorable conditions for large-volume injection and plugging construction.

[0051] The upper end of the outer sleeve 3 is threadedly connected to the upper joint 1 and is provided with a fastening screw 10 to prevent backing. The lower end is fixedly connected to the push cylinder 23 via a control pin 11. The upper end of the push cylinder 23 is connected to the upper piston 4. The outer surface of the upper piston 4 and the inner wall of the outer sleeve 3 are provided with a sealing structure to ensure sliding sealing. The upper piston 4, the outer sleeve 3, the upper joint 1, and the upper center tube 2 form an upper hydraulic chamber 26. The upper center tube 2 is provided with an upper liquid inlet 27. The high-pressure liquid in the tube flows through the upper liquid inlet 27 into the upper hydraulic chamber 26, pushing the upper piston 4 and driving the push cylinder 23 downward. The outer side of the lower end of the upper piston 4 is threadedly connected to the push cylinder 23. The inner hole of the upper piston 4 and the outer wall of the upper center tube 2 can achieve axial sealing and sliding. The middle part of the outer surface of the upper center tube 2 is provided with a thread to connect and fix the sealing ring 5. The sealing ring 5, the push cylinder 23, the upper center tube 2, and the upper piston 4 form an upper volume chamber, providing compression space for the upper piston 4 and the push cylinder 23 to move downward. A reducing step is provided in the middle of the inner hole of the push cylinder 23, and a limiting lower piston 6 is installed. A sealing structure is provided inside and outside the lower piston 6, forming a lower hydraulic chamber 28 with the push cylinder 23, the sealing spacer ring 5, and the upper center tube 2. A lower liquid outlet 29 is provided in the middle of the upper center tube 2. The high-pressure fluid in the tube enters the lower hydraulic chamber 28 through the lower liquid outlet 29, acts on the lower piston 6, and forms a combined force with the hydraulic thrust generated by the upper hydraulic chamber 26, which jointly pushes the push cylinder 23 to move downward, and cuts off the control pins 11 that control the starting, setting, and releasing actions respectively, to realize the starting, setting, releasing, and opening of the injection channel.

[0052] The lower part of the outer surface of the upper center pipe 2 is provided with a mounting pit for the control pin 11, which is connected and fixed to the main body center pipe 13 through the control pin 11. The lower end of the main body center pipe 13 is connected to the lower sleeve 21 through a thread. The flap-type one-flow valve assembly 22 is installed in the space formed by the inner side of the lower sleeve 21 and the lower center pipe 8. The lower slip 20, lower cone 19, compression rubber cylinder 18, upper cone 15 and upper slip 14 are installed in sequence on the outer surface of the main body center pipe 13 from bottom to top, and are subjected to the axial thrust of the push cylinder 23, so as to achieve anchoring and oil casing annulus isolation.

[0053] The flap-type one-way valve assembly 22 is normally open due to the limiting effect of the lower center tube 8. A sealing mechanism is provided within the mounting space of the flap-type one-way valve assembly 22, protecting it from erosion and corrosion by the fluid within the central injection channel 25 when in the open state. When the lower center tube 8 is subjected to an upward pulling force applied to the upper connector, it moves upward. Once the closed space of the flap-type one-way valve assembly 22 is cleared, the torsion force of the torsion spring reliably closes the upward flow path of the fluid in the central channel, preventing upward flow of the injected fluid. This ensures good injection quality and avoids accidents caused by backflow of slurry.

[0054] The upper slip 14 is provided with circular holes evenly distributed around the circumference. After the upper slip 14 is installed in place, through fine adjustment, the evenly distributed circular holes correspond to the control pins 11 connecting the main body center tube 13 and the upper center tube 2, and serve as operation holes for installing and fastening the control pins 11, which can realize the overall connection of the two parts of the sealing mechanism and the retainer body after the modular assembly is completed, thereby improving the assembly efficiency.

[0055] The center tube sealing assembly 7 installed at the connection between the upper center tube 2 and the lower center tube 8 is composed of V-shaped seals made of rubber material with lower hardness and polymer material with higher hardness installed alternately, which ensures reliable sealing between the upper center tube 2 and the lower center tube 8 and the main body center tube 13 after being released and re-inserted, prevents the central squeeze fluid from invading the upper part of the retainer body, and avoids the squeezed mud from sealing the pipe column and making it impossible to lift it out.

[0056] The central tube 13 of the main body is connected to the locking ratchet ring 30 through a ratchet thread. The locking ratchet ring 30 is in the shape of a C ring, and ratchet threads are provided on both the inner and outer surfaces. The locking ratchet ring 30 is connected to the upper vertebral body 15 through a ratchet thread, and the notch of the locking ratchet ring 30 is fixed by a fastening screw to prevent the locking ratchet ring 30 from rotating. After the upper vertebral body 15 is pushed downward and drives the locking ratchet ring 30 to move down into place, the locking ratchet ring 30 cannot move up, thereby realizing the anchoring locking function.

[0057] In summary, the advantages of the hydraulic large-diameter cement retainer of the present invention may include:

[0058] (1) The utility model has a reasonable structure and is easy to operate. The operating holes are evenly distributed on the slips, which can realize the overall connection of the sealing mechanism and the retainer body after the two parts are assembled in modules.

[0059] (2) The utility model has good sealing performance. The sealing packing on the core shaft enters the central tube to form a tight cavity, so that the upper and lower annuli are formed to isolate the formation, reducing the risk of casing change.

[0060] (3) The installation space of the flap-type one-way valve assembly of the utility model is provided with a sealing mechanism, so that the flap-type one-way valve assembly is protected from erosion and flushing by the fluid in the central injection channel when the flap-type one-way valve assembly is in the open state, and the construction quality is higher and the success rate is greater.

[0061] (4) The extrusion channel of the utility model is straight and has a large diameter, so the construction scale is larger, the sealing operation is safer, and the construction operation is efficient.

[0062] Although the present invention has been described above with reference to the exemplary embodiments and the accompanying drawings, it should be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A hydraulic large-diameter cement retainer, characterized in that: include: Hydraulic setting mechanism and retainer body; wherein, The hydraulic setting mechanism includes: an upper joint, an upper center tube and a lower center tube connected in sequence, an outer sleeve and a push tube sleeved on the upper center tube and connected up and down, an upper piston located between the upper center tube and the outer sleeve and connected to the upper end of the push tube, a lower piston located between the upper center tube and the push tube, a sealing ring located between the upper piston and the lower piston and sleeved on the upper center tube, and a ball seat set in the inner hole at the lower end of the upper center tube; Among them, an upper hydraulic chamber is formed between the upper joint, the upper center tube, the upper piston and the outer sleeve; A lower hydraulic chamber is formed between the lower piston, the push cylinder, the sealing spacer ring and the upper center tube; The upper central tube is provided with an upper liquid inlet hole and a lower liquid inlet hole penetrating the inner and outer walls; the upper liquid inlet hole is connected to the upper hydraulic chamber, and the lower liquid inlet hole is connected to the lower hydraulic chamber; The retainer body includes: a body center tube and a lower sleeve connected to each other, a flap-type one-way valve assembly, and an upper slip, an upper cone, a rubber sleeve, a lower cone and a lower slip sequentially sleeved on the body center tube; Among them, the main body center tube is sleeved on the upper center tube and the lower center tube, and is connected to the upper center tube; the lower sleeve and the lower center tube form an installation space, and the flap-type one-way valve assembly is located in the installation space.

2. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: The retainer body further includes a first expansion ring and a second expansion ring, wherein the first expansion ring is arranged between the upper vertebral body and the rubber cylinder, and the second expansion ring is arranged between the lower vertebral body and the rubber cylinder.

3. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: The upper joint is threadedly connected to the upper central tube, and the upper central tube is threadedly connected to the lower central tube.

4. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: The ball seat is fixed in the inner hole of the lower end of the upper center tube through a control pin.

5. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: A sealing assembly is provided at the connection between the upper joint and the upper central pipe.

6. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: A fastening screw is provided at the connection between the upper joint and the outer sleeve to prevent the buckle from being released; The lower end of the outer sleeve is connected to the push cylinder through a control pin.

7. The hydraulic large-diameter cement retainer according to claim 6, characterized in that: A diameter-changing step is provided inside the push cylinder, and the lower piston is installed and limited in the step.

8. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: The upper slip is provided with evenly distributed circular holes in the circumference, corresponding to the control pins connecting the main body center tube and the upper center tube.

9. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: The central tube of the body is connected to a locking ratchet ring through a ratchet thread, and the locking ratchet ring is C-shaped.

10. The hydraulic large-diameter cement retainer according to claim 1, characterized in that: A sealing assembly is installed at the connection between the upper central tube and the lower central tube, and the sealing assembly consists of a plurality of V-shaped sealing members.

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