Open hole packer for ultra-deep well

Abstract

The utility model provides an open hole packer for an ultra-deep well, which comprises a central pipe, an upper joint and a lower joint are arranged at the two ends of the central pipe, a delivery pipe is arranged in the central pipe and comprises a main pipeline, a packer main body is arranged on the central pipe, a packing rubber sleeve is arranged on the packer main body, and the upper joint and the lower joint are connected with the main pipeline. A cavity is formed in the packing rubber barrel, a liquid conveying structure is arranged on the top of the cavity, and a supporting seat is arranged on the lower portion of the packing rubber barrel. According to the open hole packer for the ultra-deep well, the length of the packing rubber barrel is shortened due to expansion after the packing rubber barrel is expanded, the supporting base is driven to move upwards, the multi-face anti-disengaging clamping base is expanded by the packing rubber barrel, and the outer diameter of the multi-face anti-disengaging clamping base is larger than that of the packing rubber barrel, so that the multi-face anti-disengaging clamping base makes contact with the well wall firstly, and then the multi-face anti-disengaging clamping base makes contact with the well wall; and then the packing rubber barrel continues to expand until plugging is completed, the multi-face anti-disengaging clamping base is in a sawtooth shape, friction force can be increased, and the stability of the lower portion of the packing rubber barrel is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of packers, in particular to a naked hole packer for ultra-deep wells. Background Art

[0002] A packer is a downhole tool with elastic sealing elements that can be used to seal the annular space between pipes of various sizes and the wellbore, as well as between pipes, and isolate the production layer to control the production (injection) fluid and protect the casing. It reduces the water plugging construction process of the oil well packer, can easily achieve no-well pressure and no-blowout operations, can withstand high pressure in both directions, and has a long service life.

[0003] An open hole packer for ultra-deep wells mentioned in Publication (Announcement) No. CN 210564457 U has a problem of reduced stability of the lower part of the device after long-term use due to long-term pressure on the device, resulting in reduced sealing performance.

[0004] Therefore, it is necessary to provide an open hole packer for ultra-deep wells to solve the above technical problems. Utility Model Content

[0005] The utility model provides a naked hole packer for ultra-deep wells, which solves the problem that the existing packer has reduced stability and thus reduced sealing performance after long-term use.

[0006] To solve the above technical problems, the utility model provides a naked hole packer for ultra-deep wells, comprising: a center tube, an upper joint and a lower joint are arranged at both ends of the center tube, the upper joint is threadedly connected to the center tube, the lower joint is threadedly connected to the center tube, a delivery pipe is arranged inside the center tube, the delivery pipe comprises a main pipe, a plurality of secondary pipes are arranged on the outer periphery of the main pipe, a packer body is arranged on the center tube, a sealing rubber cylinder is arranged on the packer body, the interior of the sealing rubber cylinder is a cavity, a liquid infusion structure is arranged on the top of the cavity, a support seat is arranged at the lower part of the sealing rubber cylinder, the support seat comprises a fixing ring, the fixing ring is fixedly connected to the lower end of the sealing rubber cylinder, a connecting plate is fixedly connected to the fixing ring, a rotating part is arranged at the lower part of the connecting plate, and a multi-faceted anti-detachment socket is rotatably connected to the rotating part.

[0007] Preferably, the infusion structure includes a first liquid inlet tube and a sealing float, wherein one end of the first liquid inlet tube close to the central tube corresponds to the position of the secondary pipeline, and the other end of the first liquid inlet tube is provided with a connecting seat, and a supporting plate is provided at the bottom of the connecting seat, and a plurality of through holes are opened on the supporting plate, and the sealing float is located inside the connecting seat.

[0008] Preferably, the secondary pipeline passes through the central pipe, and the secondary pipeline is fixedly connected to the central pipe.

[0009] Preferably, a sealing mechanism is provided inside the packer body, and the sealing mechanism includes a second liquid inlet pipe and a piston chamber, the second liquid inlet pipe is connected to the cavity in the sealing rubber cylinder, the piston chamber is located inside the packer body, the other end of the second liquid inlet pipe is connected to the piston chamber, a piston block is slidably connected to the inside of the piston chamber, a pin is provided at a position of the center tube near the piston block, the packer body is fixedly connected to the center tube by the pin, and the pin penetrates into the interior of the piston block.

[0010] Preferably, a plurality of elastic connecting rings are sleeved on the multi-faceted anti-dropping card seat, and the elastic connecting rings are made of a rubber composite material.

[0011] Preferably, the upper end surface and the lower end surface of the lower joint are both inclined surfaces.

[0012] Compared with the related art, the open hole packer for ultra-deep wells provided by the utility model has the following advantages:

[0013] Beneficial effects:

[0014] The utility model provides an open-hole packer for ultra-deep wells. After the packing rubber tube expands, its length is shortened due to the expansion, which drives the support seat to move upward, and the multi-faceted anti-detachment clamping seat is subsequently opened by the packing rubber tube. Because the outer diameter of the multi-faceted anti-detachment clamping seat is larger than the outer diameter of the packing rubber tube, it first contacts the well wall, and then the packing rubber tube continues to expand until the plugging is completed. The multi-faceted anti-detachment clamping seat is in a sawtooth shape, which can increase the friction force and enhance the stability below the packing rubber tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a preferred embodiment of an open hole packer for ultra-deep wells provided by the utility model;

[0016] Figure 2 It is a top view of the delivery pipe and the central pipe;

[0017] Figure 3 This is a schematic diagram of the structure inside the sealing rubber cylinder of the utility model;

[0018] Figure 4 for Figure 2 An enlarged schematic diagram of part A is shown;

[0019] Figure 5 This is a schematic diagram of the structure of the support seat in the utility model;

[0020] Figure 6 It is a side view of the support seat after unfolding in the utility model.

[0021] Numbers in the figure: 1. center tube, 2. upper joint, 3. delivery pipe, 31. main pipeline, 32. auxiliary pipeline, 4. packer body, 5. packer rubber cylinder, 6. infusion structure, 61. first liquid inlet pipe, 62. connecting seat, 63. bearing plate, 64. blocking float, 7. blocking mechanism, 71. second liquid inlet pipe, 72. piston chamber, 73. piston block, 8. pin, 9. support seat, 91. fixing ring, 92. connecting plate, 93. rotating part, 94. multi-faceted anti-dropping seat, 95. elastic connecting ring, 10. lower joint. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of an open hole packer for ultra-deep wells provided by the utility model;

[0024] Figure 2 It is a top view of the delivery pipe and the central pipe;

[0025] Figure 3 This is a schematic diagram of the structure inside the sealing rubber cylinder of the utility model;

[0026] Figure 4 for Figure 2 An enlarged schematic diagram of part A is shown;

[0027] Figure 5 This is a schematic diagram of the structure of the support seat in the utility model;

[0028] Figure 6 It is a side view of the support seat after unfolding in the utility model.

[0029] A open hole packer for ultra-deep wells comprises: a central pipe 1, an upper joint 2 and a lower joint 10 are provided at both ends of the central pipe 1, the upper joint 2 is threadedly connected to the central pipe 1, the lower joint 10 is threadedly connected to the central pipe 1, a delivery pipe 3 is provided inside the central pipe 1, the delivery pipe 3 comprises a main pipe 31, a plurality of secondary pipes 32 are provided on the outer periphery of the main pipe 31, a packer body 4 is provided on the central pipe 1, a packer rubber tube 5 is provided on the packer body 4, the interior of the packer rubber tube 5 is a cavity, a liquid infusion structure 6 is provided on the top of the cavity, a support seat 9 is provided at the lower part of the packer rubber tube 5, the support seat 9 comprises a fixing ring 91, the fixing ring 91 is fixedly connected to the lower end of the packer rubber tube 5, a connecting piece 92 is fixedly connected to the fixing ring 91, a rotating member 93 is provided at the lower part of the connecting piece 92, and a multi-faceted anti-detachment holder 94 is rotatably connected to the rotating member 93.

[0030] When the device as a whole descends to the position that needs to be sealed, the expansion medium is transported to the internal cavity of the sealing rubber tube 5 through the delivery pipe 3 and the infusion structure 6, so that its volume expands and its length shortens until its outer surface contacts the well wall. The support seat 9 provides support for the sealing rubber tube 5 from the bottom to complete the sealing. The center pipe 1 and other parts are separated from the sealing device body 4 and retracted.

[0031] The infusion structure 6 includes a first liquid inlet pipe 61 and a sealing float 64. The end of the first liquid inlet pipe 61 close to the central pipe 1 corresponds to the position of the auxiliary pipeline 32. The other end of the first liquid inlet pipe 61 is provided with a connecting seat 62. The bottom of the connecting seat 62 is provided with a supporting plate 63. A plurality of through holes are opened on the supporting plate 63. The sealing float 64 is located inside the connecting seat 62.

[0032] When the device descends to the position that needs to be sealed, an expansion medium is transported to the sealing rubber tube 5 through the main pipeline 31, the auxiliary pipeline 32 and the infusion structure 6. The expansion medium is generally liquid such as water and hydraulic oil, and enters the internal cavity of the sealing rubber tube 5 from the through hole opened on the supporting plate 63. As the liquid delivery amount increases, the sealing rubber tube 5 expands accordingly, and the liquid level in the internal cavity also rises accordingly. When the liquid level rises to the inside of the connecting seat 62, the blocking float 64 rises with the liquid level. When it rises to the upper part of the connecting seat 62, since the diameter of the blocking float 64 is larger than the inner diameter of the first liquid inlet pipe 61, the upper part of the connecting seat 62 is blocked, thereby ending the infusion process.

[0033] The secondary pipe 32 passes through the central pipe 1 , and the secondary pipe 32 is fixedly connected to the central pipe 1 .

[0034] The expansion medium passes through the main pipeline 31 and the auxiliary pipeline 32 , enters the infusion structure 6 , and reaches the inner cavity of the sealing rubber tube 5 .

[0035] A sealing mechanism 7 is provided inside the packer body 4, and the sealing mechanism 7 includes a second liquid inlet pipe 71 and a piston chamber 72. The second liquid inlet pipe 71 is connected to the cavity in the sealing rubber tube 5, and the piston chamber 72 is located inside the packer body 4. The other end of the second liquid inlet pipe 71 is connected to the piston chamber 72. A piston block 73 is slidably connected to the inside of the piston chamber 72. A pin 8 is provided near the piston block 73 on the center pipe 1. The packer body 4 is fixedly connected to the center pipe 1 through the pin 8, and the pin 8 penetrates into the inside of the piston block 73.

[0036] Due to the communicating vessel principle, the expansion medium enters the piston cavity 72 from the upper part of the cavity in the sealing rubber tube 5 and the second liquid inlet pipe 71, driving the piston block 73 to move upward, thereby shearing the pin 8. At this time, the sealing is completed, the central pipe 1 and the sealing device body 4 are no longer connected, and the central pipe 1 can be withdrawn.

[0037] A plurality of elastic connection rings 95 are sleeved on the multi-faceted anti-dropping holder 94 , and the elastic connection rings 95 are made of a rubber composite material.

[0038] The rubber composite material has sufficient strength while ensuring elasticity, and the elastic connecting ring 95 constrains the multi-faceted anti-detachment holder 94 to prevent it from scratching the well wall and affecting the sinking process of the entire device in the open hole.

[0039] The upper end surface and the lower end surface of the lower joint 10 are both inclined surfaces.

[0040] When the device moves downward as a whole, the lower end face of the lower joint 10 contacts the well wall first to avoid premature sealing; and because the upper and lower end faces of the lower joint 10 are both inclined surfaces, it can prevent the debris on the well wall and the bottom of the well from accumulating at both ends of the lower joint 10 during the movement, making it difficult for the end of the device to enter and exit.

[0041] The working principle of an open hole packer for ultra-deep wells provided by the utility model is as follows:

[0042] When the device as a whole descends to the position that needs to be sealed, the expansion medium is transported to the internal cavity of the sealing rubber tube 5 through the delivery pipe 3 and the infusion structure 6, so that its volume expands and its length shortens until its outer surface contacts the well wall. The support seat 9 provides support for the sealing rubber tube 5 from the bottom to complete the sealing. The center pipe 1 and other parts are separated from the sealing device body 4 and retracted.

[0043] Compared with the related art, the open hole packer for ultra-deep wells provided by the utility model has the following advantages:

[0044] Beneficial effects:

[0045] After the sealing rubber tube 5 expands, its length shortens due to expansion, driving the support seat 9 to move upward, and the multi-faceted anti-detachment seat 94 is subsequently opened by the sealing rubber tube 5. Because the outer diameter of the multi-faceted anti-detachment seat 94 is larger than the outer diameter of the sealing rubber tube 5, it first contacts the well wall, and then the sealing rubber tube 5 continues to expand until the plugging is completed. The multi-faceted anti-detachment seat 94 is serrated in shape, which can increase friction and enhance the stability below the sealing rubber tube 5.

[0046] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An open hole packer for ultra-deep wells, characterized in that: include: A center tube, with an upper joint and a lower joint being arranged at both ends of the center tube, the upper joint being threadedly connected to the center tube, the lower joint being threadedly connected to the center tube, a delivery pipe being arranged inside the center tube, the delivery pipe comprising a main pipe, a plurality of sub-pipes being arranged on the periphery of the main pipe, a packer body being arranged on the center tube, a packer body being arranged on the packer body, the interior of the packer rubber tube being a cavity, a liquid infusion structure being arranged on the top of the cavity, a support seat being arranged at the lower part of the packer rubber tube, the support seat comprising a fixing ring, the fixing ring being fixedly connected to the lower end of the packer rubber tube, a connecting plate being fixedly connected to the fixing ring, a rotating part being arranged at the lower part of the connecting plate, a multi-faceted anti-detachment socket being rotatably connected to the rotating part.

2. The open hole packer for ultra-deep wells according to claim 1, characterized in that: The infusion structure includes a first liquid inlet pipe and a sealing float. The end of the first liquid inlet pipe close to the central pipe corresponds to the position of the auxiliary pipeline. The other end of the first liquid inlet pipe is provided with a connecting seat. The bottom of the connecting seat is provided with a supporting plate. A plurality of through holes are opened on the supporting plate. The sealing float is located inside the connecting seat.

3. The open hole packer for ultra-deep wells according to claim 1, characterized in that: The secondary pipeline passes through the central pipe, and the secondary pipeline is fixedly connected to the central pipe.

4. The open hole packer for ultra-deep wells according to claim 1, characterized in that: A sealing mechanism is provided inside the packer body, and the sealing mechanism includes a second liquid inlet pipe and a piston cavity. The second liquid inlet pipe is connected to the cavity in the sealing rubber cylinder, and the piston cavity is located inside the packer body. The other end of the second liquid inlet pipe is connected to the piston cavity. A piston block is slidably connected to the inside of the piston cavity. A pin is provided at a position of the center tube near the piston block. The packer body is fixedly connected to the center tube by the pin, and the pin penetrates into the interior of the piston block.

5. The open hole packer for ultra-deep wells according to claim 1, characterized in that: A plurality of elastic connecting rings are sleeved on the multi-faceted anti-dropping card seat, and the elastic connecting rings are made of a rubber composite material.

6. The open hole packer for ultra-deep wells according to claim 1, characterized in that: The upper end surface and the lower end surface of the lower joint are both inclined surfaces.

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