Downhole Packer Device

Abstract

The present invention relates to a downhole packer device, and relates to the technical field of deep-sea oil drilling equipment. It comprises: an automatic dosing pipe string assembly, whose upper end is connected to the upper oil pipe, and a first dosing channel is arranged in the automatic dosing pipe string assembly; a packer pipe string assembly, whose upper end is connected to the lower end of the automatic dosing pipe string assembly, and a second dosing channel is arranged in the packer pipe string assembly, and one end of the second dosing channel is connected to the first dosing channel; wherein the automatic dosing pipe string assembly can automatically transport the drug solution therein to the downhole casing through the first dosing channel and the second dosing channel in sequence. In the present invention, the downhole packer device is integrated with an automatic dosing pipe string assembly, which can automatically inject the drug solution into the downhole casing through the first dosing channel and the second dosing channel in the downhole, so as to slow down or prevent corrosion, waxing and scaling in the underwater oil well. Thereby, the efficiency of downhole dosing is improved, and the cost is also saved.

Description

Technical Field

[0001] The invention relates to the technical field of deep-sea oil drilling equipment, and in particular to a downhole packer device. Background Art

[0002] The packer is an important tool for isolating the oil layer in the casing, and is widely used in the field of deep-sea oil drilling. Its main component is a rubber tube, which is inflated by hydraulic or mechanical action to seal the annular space between the oil pipe and the casing, separating the upper and lower oil layers to achieve the construction purpose.

[0003] At present, a center hole oil circuit and an annulus dosing circuit are provided in the packer. The center hole oil circuit is used to transport oil, and the annulus dosing circuit is used to add a chemical solution into the well. The center hole oil circuit and the annulus dosing circuit are not connected.

[0004] In the prior art, professional technicians are required to regularly inject a chemical solution into the underwater oil wells on the offshore platform by means of the annular dosing line to slow down or prevent corrosion, waxing and scaling in the underwater oil wells.

[0005] However, this method of manually injecting medicine has the problems of low medicine addition efficiency and high labor cost. Summary of the invention

[0006] The invention provides a downhole packer device, which is used to solve the problems of low drug addition efficiency and high cost in the method of artificially injecting drugs.

[0007] The present invention provides a downhole packer device, comprising:

[0008] An automatic dosing column assembly, the upper end of which is connected to the upper oil pipe, and a first dosing channel is provided in the automatic dosing column assembly; and

[0009] The upper end of the packer string assembly is connected to the lower end of the automatic dosing string assembly, and a second dosing channel is provided in the packer string assembly, and one end of the second dosing channel is connected to the first dosing channel;

[0010] Among them, the packer string assembly can seal the casing annulus between the downhole casing and the upper oil pipe at a preset sealing position in the downhole casing, the other end of the second dosing channel is connected to the downhole casing, and the automatic dosing string assembly can automatically transport the drug solution therein to the downhole casing through the first dosing channel and the second dosing channel in sequence.

[0011] In one embodiment, the automatic dosing column assembly comprises:

[0012] An upper oil pipe joint, the upper end of which is connected to the lower end of the upper oil pipe, and the upper oil pipe joint has an axial flow cavity for conveying oil and a radial flow cavity that is not connected to the axial flow cavity, one end of the axial flow cavity is connected to the central hole channel of the upper oil pipe, and the radial flow cavity is used to add a pharmaceutical solution;

[0013] A first drug path conversion ring, which is arranged on the upper oil pipe joint;

[0014] A flow tube, the upper end of which is connected to the lower end of the upper oil pipe joint;

[0015] The pressure-bearing cylinder is sleeved on the outer circumference of the flow cylinder, the upper end of the pressure-bearing cylinder is connected to the lower end of the upper oil pipe joint, the lower end of the pressure-bearing cylinder is connected to the upper end of the packer string assembly, and an annular flow channel is provided between the pressure-bearing cylinder and the flow cylinder;

[0016] An electrically controlled drug circuit valve assembly, one end of which is connected to the other end of the flow tube, and the electrically controlled drug circuit valve assembly is at least partially located in the pressure-bearing tube; and

[0017] A second drug path conversion ring assembly is arranged in the pressure-bearing cylinder, one end of the second drug path conversion ring assembly is connected to the other end of the electric-controlled drug path valve assembly, and the other end of the second drug path conversion ring assembly is connected to the packer string assembly;

[0018] Among them, the second drug path conversion ring assembly separates the annular flow channel between it and the pressure tube into an upper flow channel and a lower flow channel, the upper flow channel is connected with the annular space flow channel, and the lower flow channel is connected with the annular space channel of the isolation device string assembly. The first drug path conversion ring is used to connect the axial flow cavity with the annular space flow channel, and to connect the radial flow cavity with the central hole channel of the flow tube. The electrically controlled drug path valve assembly is used to control the liquid flow rate flowing out of the central hole channel. The second drug path conversion ring assembly is used to connect the central hole channel of the flow tube with the lower flow channel, and to connect the upper flow channel with the central hole channel of the isolation device string assembly.

[0019] In one embodiment, the first drug path conversion ring is disposed in the upper oil pipe joint, and a connecting channel is disposed in the upper oil pipe joint. One end of the connecting channel is connected to the first drug path conversion ring, and the other end of the connecting channel is connected to the annular flow channel. The first drug path conversion ring is used to connect the axial flow cavity with the connecting channel.

[0020] In one embodiment, a first conversion chamber and a second conversion chamber that is not connected to the first conversion chamber are provided in the first drug route conversion ring, one end of the first conversion chamber is connected to the axial flow chamber, and the other end thereof is connected to the connecting channel, one end of the second conversion chamber is connected to the radial flow chamber, and the other end thereof is connected to the central channel of the flow cylinder.

[0021] In one embodiment, the electronically controlled drug circuit valve assembly comprises:

[0022] A medicine path valve seat, one end of which is connected to the lower end of the flow tube, the other end of which is connected to one end of the second medicine path conversion ring assembly, and a first flow hole is provided in the medicine path valve seat; and

[0023] A valve core is rotatably disposed in the medicine path valve seat, and a second flow hole is disposed on the valve core; and

[0024] An electric drive assembly is connected to the valve core and is used to control the rotation of the valve core. The electric drive assembly is arranged in the flow cylinder;

[0025] The overlap between the first flow hole and the second flow hole can be adjusted by rotating the valve core to control the flow of the electronically controlled medicine circuit valve assembly.

[0026] In one embodiment, the electric drive assembly comprises:

[0027] An isolation cylinder is fixed in the flow cylinder, and the isolation cylinder is not connected to the flow cylinder; and

[0028] A valve opening and closing motor is disposed in the isolation tube, and a driving shaft of the valve opening and closing motor extends out of the isolation tube and is connected to the valve core; and

[0029] A sealing member is sleeved on the driving shaft and is used to seal the gap between the driving shaft and the isolation cylinder;

[0030] A main control board is disposed in the isolation tube and is electrically connected to the valve opening and closing motor. The main control board is used to control the rotation of the valve opening and closing motor; and

[0031] A battery is disposed in the isolation tube and is electrically connected to the main control board and the valve opening and closing motor, and the battery is used to supply power to the main control board and the valve opening and closing motor;

[0032] The pharmaceutical solution flows into the pharmaceutical path valve seat from the annular space between the isolation cylinder and the flow cylinder.

[0033] In one embodiment, the second drug switching ring assembly comprises:

[0034] A lower oil pipe joint is arranged in the pressure-bearing cylinder, and the lower end of the lower oil pipe joint is connected to the central hole channel of the packer pipe string assembly; and

[0035] A second drug circuit conversion ring, one end of which is connected to the other end of the electric-controlled drug circuit valve assembly, and the other end of the second drug circuit conversion ring is arranged in the lower oil pipe joint;

[0036] Among them, there is an annular channel between the second medicine path conversion ring and the lower oil pipe joint, one end of the annular channel is connected to the second medicine path conversion ring, and the other end is connected to the lower flow channel. The second medicine path conversion ring is used to connect the central hole channel of the flow tube with the annular channel, and to connect the upper flow channel with the central hole channel of the isolation device pipe string assembly.

[0037] In one embodiment, the second drug conversion ring is a split structure, which includes:

[0038] A medicine path conversion ring body, which is arranged in the lower oil pipe joint; and

[0039] A medicine path conversion cylinder is seated on the lower oil pipe joint, one end of which is connected to the medicine path valve seat, and the other end of which is pressed tightly on the medicine path conversion ring body;

[0040] Among them, the drug path conversion ring body is provided with a first isolation chamber and a second isolation chamber not connected with the first isolation chamber, the drug path conversion cylinder is provided with a first connecting chamber and a second connecting chamber not connected with the first connecting chamber, one end of the first isolation chamber is connected with the liquid outlet of the drug path valve seat, one end of the first connecting chamber is connected with the other end of the first isolation chamber, the other end of the first connecting chamber is connected with the lower flow channel, one end of the second isolation chamber is connected with the upper flow channel, the other end of the second isolation chamber is connected with one end of the second connecting chamber, and the other end of the second connecting chamber is connected with the center hole channel of the isolation device tubing assembly.

[0041] In one embodiment, a communication hole is opened on the outer circumference of the lower oil pipe joint, one end of the communication hole is communicated with the first communication cavity, and the other end of the communication hole is communicated with the lower flow channel.

[0042] In one embodiment, the first dosing channel includes a radial flow chamber, a second conversion chamber, an annular space, a flow channel of an electrically controlled drug circuit valve assembly, a first isolation chamber, a first connecting chamber, a connecting hole and a lower flow channel, and the second dosing channel is an annulus channel of the isolation device tubing assembly.

[0043] Compared with the prior art, the present invention has the advantage that an automatic dosing string assembly is integrated in the downhole packer device, which can automatically inject a drug solution into the downhole casing through the first dosing channel and the second dosing channel to prevent corrosion, wax deposition and scaling of the downhole casing. This replaces the prior art method of requiring professional technicians to regularly inject drug solutions into the downhole on the ground platform. This improves the efficiency of downhole dosing and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0045] Figure 1 is a schematic diagram of the three-dimensional structure of a downhole packer device in an embodiment of the present invention;

[0046] Figure 2 yes Figure 1 A front view of the downhole packer device;

[0047] Figure 3 yes Figure 2Cross-sectional view of the downhole packer device at AA (the arrow direction indicates the flow path of the reagent solution, and the schematic diagram shows the downhole casing);

[0048] Figure 4 yes Figure 3 A cross-sectional view of the automatic dosing column assembly (the straight arrow direction is the drug flow path, and the arc arrow direction is the oil flow path);

[0049] Figure 5 It is a three-dimensional exploded view of the automatic dosing column assembly in 3;

[0050] Figure 6 yes Figure 3 A schematic diagram of the three-dimensional structure of the upper oil pipe joint;

[0051] Figure 7 yes Figure 3 Schematic diagram of the first drug circuit conversion ring installed in the upper oil pipe joint;

[0052] Figure 8 yes Figure 3 Schematic diagram of the second drug circuit conversion ring installed in the lower oil pipe joint

[0053] Fig. 9 yes Figure 3 Schematic diagram of the three-dimensional structure of the electric drive component;

[0054] Fig.10 yes Figure 1 Main cross-sectional view of the middle packer string assembly.

[0055] Reference numerals:

[0056] 10. Automatic dosing column assembly; 11. First dosing channel; 12. First drug path conversion ring; 121. First conversion chamber; 122. Second conversion chamber; 13. Flow tube; 14. Pressure tube; 141. Annular flow channel; 15. Electric control drug path valve assembly; 151. Drug path valve seat; 1511. First flow hole; 152. Valve core; 1521. Second flow hole; 153. Electric drive assembly; 1531. Isolation tube; 1532. Valve opening and closing motor; 1533. Main control board; 1534. Battery; 1535. Fixed ring; 1536. Active transfer support; 1537. Spring; 1538. Sealing cover; 16. Second drug path conversion ring assembly; 161. Upper flow channel; 162. Lower flow channel; 163. Lower Oil pipe joint; 1631, connecting hole; 164, second drug path conversion ring; 1641, drug path conversion ring body; 1642, drug path conversion cylinder; 1643, first isolation chamber; 1644, second isolation chamber; 1645, first connecting chamber; 1646, second connecting chamber; 17, upper oil pipe joint; 171, axial flow chamber; 172, radial flow chamber; 173, connecting passage; 20, packer string assembly; 21, second drug adding passage; 22, center hole passage; 23, annulus passage; 24, center pipe; 25, rubber cylinder seat; 26, rubber cylinder assembly; 27, slip assembly; 28, guide body assembly; 29, connecting and stabilizing body assembly; 100, upper oil pipe; 200, casing annulus; 300, downhole casing. DETAILED DESCRIPTION

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] like Figures 1 to 5 As shown, the present invention provides a downhole packer device, which includes an automatic dosing string assembly 10 and a packer string assembly 20. The upper end of the automatic dosing string assembly 10 is connected to the upper oil pipe 100, and a first dosing channel 11 is provided in the automatic dosing string assembly 10; the upper end of the packer string assembly 20 is connected to the lower end of the automatic dosing string assembly 10, and a second dosing channel 21 is provided in the packer string assembly 20, and one end of the second dosing channel 21 is connected to the first dosing channel 11; the packer string assembly 20 can block the casing annulus 200 between the downhole casing 300 and the upper oil pipe 100 at a preset setting position in the downhole casing 300, and the other end of the second dosing channel 21 is connected to the downhole casing 300. The automatic dosing string assembly 10 can automatically transport the drug solution therein to the downhole casing 300 through the first dosing channel 11 and the second dosing channel 21 in sequence.

[0059] In the above arrangement, an automatic dosing string assembly 10 is integrated in the downhole packer device, which can automatically inject a drug solution into the downhole casing 300 through the first dosing channel 11 and the second dosing channel 21 to prevent corrosion, wax deposition and scaling of the downhole casing 300. This replaces the method in the prior art that professional technicians are required to regularly inject drug solutions into the downhole on the ground platform. This improves the efficiency of downhole dosing and saves costs.

[0060] It should be noted that the pharmaceutical solution injected into the well in the present application includes pharmaceutical solutions that slow down or prevent corrosion, waxing, scaling, etc. in the oil well to ensure the normal production of the oil well. It is pre-configured and stored in the automatic dosing string assembly 10. The automatic dosing string assembly 10 automatically injects the pharmaceutical solution into the downhole casing 300 according to the program set therein (the outlet end of the second dosing channel 21 is directly connected to the oil casing annulus at the bottom of the rubber cartridge assembly 26, and the pharmaceutical solution enters the oil casing annulus at the bottom of the rubber cartridge assembly 26 from the outlet end of the second dosing channel 21) to prevent corrosion, waxing, scaling and other problems in the oil well.

[0061] Specifically, Figure 4 and Figure 5 As shown, in one embodiment, the automatic dosing column assembly 10 includes an upper oil pipe joint 17, a first drug path conversion ring 12, a flow tube 13, a pressure tube 14, an electronically controlled drug path valve assembly 15, and a second drug path conversion ring assembly 16. The upper oil pipe joint 17, whose upper end is connected to the lower end of the upper oil pipe 100, has an axial flow chamber 171 for conveying oil and a radial flow chamber 172 that is not connected to the axial flow chamber 171. One end of the axial flow chamber 171 is connected to the central hole channel of the upper oil pipe 100, and the radial flow chamber 172 is used to add drug solution; the first drug path conversion ring 12 is arranged on the upper oil pipe joint 17; the flow tube 13, whose upper end is connected to the lower end of the upper oil pipe joint 17; the pressure tube 14, which is sleeved on the outer circumference of the flow tube 13, and the pressure tube 14 is sleeved on the outer circumference of the flow tube 13. 4 is connected to the lower end of the upper oil pipe joint 17, the lower end of the pressure-bearing cylinder 14 is connected to the upper end of the packer string assembly 20, and an annular space flow channel 141 is provided between the pressure-bearing cylinder 14 and the flow cylinder 13; an electrically-controlled medicine circuit valve assembly 15, one end of which is connected to the other end of the flow cylinder 13, and a part of the electrically-controlled medicine circuit valve assembly 15 is located in the pressure-bearing cylinder 14; a second medicine circuit conversion ring assembly 16 is arranged in the pressure-bearing cylinder 14, one end of the second medicine circuit conversion ring assembly 16 is connected to the other end of the electrically-controlled medicine circuit valve assembly 15, and the other end thereof is connected to the packer string assembly 20.

[0062] Specifically, Figure 4As shown, in one embodiment, the second drug path conversion ring assembly 16 separates the annular flow channel between it and the pressure tube 14 into an upper flow channel 161 and a lower flow channel 162, the upper flow channel 161 is connected to the annular space flow channel 141, and the lower flow channel 162 is connected to the annular space channel 23 of the isolation pipe string assembly 20, the first drug path conversion ring 12 is used to connect the axial flow cavity 171 with the annular space flow channel 141, and to connect the radial flow cavity 172 with the central hole channel of the flow tube 13, the electrically controlled drug path valve assembly 15 is used to control the liquid flow rate flowing out of the central hole channel, the second drug path conversion ring assembly 16 is used to connect the central hole channel of the flow tube 13 with the lower flow channel 162, and to connect the upper flow channel 161 with the central hole channel 22 of the isolation pipe string assembly 20.

[0063] In the above-mentioned setting, by setting the electrically controlled drug circuit valve assembly 15, the liquid flow rate flowing out of the central channel can be automatically controlled. That is, the flow rate size and opening and closing time of drug addition can be controlled, and the precise control of the timing and amount of drug addition can be achieved, so that the quality of drug addition is greatly improved. By setting the first drug circuit conversion ring 12, the drug circuit space can be expanded, that is, the flow space of the drug solution is expanded from the radial flow cavity 172 to the central channel of the flow tube 13. In this way, the internal space of the automatic drug dosing column assembly 10 is fully utilized, so that more drug solutions can be stored in the automatic drug dosing column assembly 10. Thereby improving the drug dosing efficiency of the automatic drug dosing column assembly 10. At the same time, it is also convenient to install the electrically controlled drug circuit valve assembly 15 at the lower end of the flow tube 13 to accurately control the amount of drug addition.

[0064] It should be noted that in the prior art, the downhole packer device is usually provided with an oil circuit extending along its axial direction, which is connected to the upper and lower oil pipes for oil production. The packer rubber cylinder separates the annulus (casing annulus) formed by the oil pipe and the casing. As a result, the liquid in the casing annulus above the rubber cylinder assembly cannot flow into the casing annulus space below the rubber cylinder assembly, resulting in the inability to implement drug addition in the casing annulus space below the rubber cylinder assembly, affecting the anti-corrosion treatment of the casing and oil pipe part below the rubber cylinder.

[0065] In order to expand the medicine circuit space, the present invention sets a first medicine circuit conversion ring 12, which expands the medicine circuit space from the external annular space of the upper oil pipe 100 to the central hole of the entire flow tube 13, so as to facilitate the subsequent installation of the electric-controlled medicine circuit valve assembly 15 and increase the storage capacity of the medicine solution. In other words, the current medicine circuit space occupies the original oil circuit space. The first medicine circuit conversion ring 12 simultaneously converts the oil circuit space from the inner hole of the upper oil pipe 100 to the annular flow channel 141 between the pressure tube 14 and the flow tube 13. In this way, the annular space of the downhole packer device is converted into the oil circuit space. That is, the first interchange of the oil circuit and the medicine circuit is realized.

[0066] Moreover, the present application is provided with a second drug circuit conversion ring assembly 16, which is used to connect the central hole of the flow tube 13 with the lower flow channel 162, and to connect the upper flow channel 161 with the central hole channel 22 of the packer string assembly 20. This can be understood as realizing the second interchange of the oil circuit and the drug circuit. That is, the oil circuit space is converted from the annular flow channel 141 to the central hole channel 22, and the drug circuit space is converted from the central hole channel to the lower flow channel 162 of the annular flow channel. In this way, the oil casing annular space below the rubber cylinder can be dosing, which will not affect the corrosion protection of the oil casing part below the rubber cylinder.

[0067] Specifically, Figure 6 and Figure 7 As shown, in one embodiment, the first drug circuit conversion ring 12 is arranged in the upper oil pipe joint 17, and a connecting channel 173 is arranged in the upper oil pipe joint 17. One end of the connecting channel 173 is connected to the first drug circuit conversion ring 12, and the other end of the connecting channel 173 is connected to the annular flow channel 141. The first drug circuit conversion ring 12 is used to connect the axial flow cavity 171 with the connecting channel 173. It should be noted that since the first drug circuit conversion ring 12 is arranged in the upper oil pipe joint 17, a connecting channel 173 must be arranged in the upper oil pipe joint 17, and the communication between the axial flow cavity 171 and the annular flow channel 141 is achieved through the connecting channel 173.

[0068] Of course, in an alternative embodiment not shown in the drawings of the present application, the first drug path conversion ring 12 is not arranged in the upper oil pipe joint 17, that is, the first drug path conversion ring 12 is directly fixed to the lower end of the upper oil pipe joint 17, and the axial flow cavity 171 is directly connected to the annular flow channel 141.

[0069] Specifically, Figure 7 As shown, in one embodiment, a first conversion chamber 121 and a second conversion chamber 122 not connected to the first conversion chamber 121 are provided in the first drug circuit conversion ring 12, one end of the first conversion chamber 121 is connected to the axial flow chamber 171, and the other end thereof is connected to the connecting channel 173, one end of the second conversion chamber 122 is connected to the radial flow chamber 172, and the other end thereof is connected to the central hole of the flow cylinder 13. That is, the first interchange function of the oil circuit and the drug circuit is realized by providing the first conversion chamber 121 and the second conversion chamber 122 not connected to the first conversion chamber 121.

[0070] Specifically, Figure 4 and Figure 5As shown, in one embodiment, the electric-controlled medicine circuit valve assembly 15 includes a medicine circuit valve seat 151, a valve core 152 and an electric drive assembly 153. Among them, the medicine circuit valve seat 151, one end of which is connected to the lower end of the flow tube 13, and the other end of the medicine circuit valve seat 151 is connected to one end of the second medicine circuit conversion ring assembly 16, and the medicine circuit valve seat 151 is provided with a first flow hole 1511; the valve core 152 is rotatably arranged in the medicine circuit valve seat 151, and the valve core 152 is provided with a second flow hole 1521; the electric drive assembly 153 is connected to the valve core 152, and the electric drive assembly 153 is used to control the rotation of the valve core 152, and the electric drive assembly 153 is arranged in the flow tube 13; by rotating the valve core 152, the overlap between the first flow hole 1511 and the second flow hole 1521 can be adjusted to control the flow of the electric-controlled medicine circuit valve assembly 15.

[0071] It should be noted that by controlling the rotation angle of the valve core 152, the overlap between the second flow hole 1521 and the first flow hole 1511 can be controlled, that is, the opening degree of the valve can be controlled, thereby accurately controlling the flow of the electronically controlled drug circuit valve assembly 15.

[0072] Specifically, Figure 4 As shown, in one embodiment, the electric drive assembly 153 includes an isolation cylinder 1531, a valve opening and closing motor 1532, a seal, a main control board 1533 and a battery 1534. Among them, the isolation cylinder 1531 is fixed in the flow cylinder 13, and the isolation cylinder 1531 is not connected with the flow cylinder 13; the valve opening and closing motor 1532 is arranged in the isolation cylinder 1531, and the driving shaft of the valve opening and closing motor 1532 extends out of the isolation cylinder 1531 and is connected to the valve core 152. The seal is sleeved on the driving shaft and is used to seal the gap between the driving shaft and the isolation cylinder 1531; the main control board 1533 is arranged in the isolation cylinder 1531 and is electrically connected to the valve opening and closing motor 1532. The main control board 1533 is used to control the rotation of the valve opening and closing motor 1532. The battery 1534 is disposed in the isolation cylinder 1531 and is electrically connected to the main control board 1533 and the valve opening and closing motor 1532. The battery 1534 is used to supply power to the main control board 1533 and the valve opening and closing motor 1532. The pharmaceutical solution flows into the medicine path valve seat 151 from the annular space between the isolation cylinder 1531 and the flow cylinder 13.

[0073] It should be noted that the pharmaceutical solution flows in the annular space between the isolation cylinder 1531 and the flow cylinder 13. The flowing pharmaceutical solution can exchange heat with the heat generated by the valve opening and closing motor 1532, the main control board 1533 and the battery 1534 in the isolation cylinder 1531 when they are working, thereby reducing the temperature in the isolation cylinder 1531, and further ensuring that the valve opening and closing motor 1532, the main control board 1533 and the battery 1534 can operate at the operating temperature.

[0074] Specifically, Figure 4 As shown, in one embodiment, a fixing ring 1535 is sleeved on the outer circumference of the isolation cylinder 1531 , and the fixing ring 1535 fixes the isolation cylinder 1531 in the flow cylinder 13 .

[0075] Specifically, Figure 1 and Fig. 9 As shown, in one embodiment, a movable transfer support 1536 is sleeved on the outer circumference of the driving shaft of the valve opening and closing motor 1532, and the movable transfer support 1536 includes a cylinder body and a roller arranged at one end of the cylinder body. A spring 1537 is arranged between the fixed ring 1535 and the movable transfer support 1536, and the spring 1537 is used to press the roller of the movable transfer support 1536 onto the valve core 152. In this way, the stability of the rotation of the valve core 152 can be improved, thereby improving its rotation efficiency.

[0076] Specifically, Figure 5 and Figure 8 As shown, in one embodiment, the second drug circuit conversion ring assembly 16 includes a lower oil pipe joint 163 and a second drug circuit conversion ring 164. The lower oil pipe joint 163 is arranged in the pressure-bearing tube 14, and the lower end of the lower oil pipe joint 163 is connected to the central hole channel 22 of the packer string assembly 20; the second drug circuit conversion ring 164, one end of which is connected to the other end of the electric-controlled drug circuit valve assembly 15, and the other end of the second drug circuit conversion ring 164 is arranged in the lower oil pipe joint 163; there is an annular channel between the second drug circuit conversion ring 164 and the lower oil pipe joint 163, one end of the annular channel is connected to the second drug circuit conversion ring 164, and the other end thereof is connected to the lower flow channel 162, and the second drug circuit conversion ring 164 is used to connect the central hole channel of the flow tube 13 with the annular channel, and to connect the upper flow channel 161 with the central hole channel 22 of the packer string assembly 20.

[0077] Specifically, Figure 8As shown, in one embodiment, the second drug path conversion ring 164 is a split structure, which includes a drug path conversion ring body 1641 and a drug path conversion cylinder 1642. The drug path conversion ring body 1641 is arranged in the lower oil pipe joint 163; the drug path conversion cylinder 1642 is sealed on the lower oil pipe joint 163, one end of the drug path conversion cylinder 1642 is connected to the drug path valve seat 151, and the other end thereof is pressed against the drug path conversion ring body 1641; the drug path conversion ring body 1641 has a first isolation chamber 1643 and a second isolation chamber 1644 that is not connected to the first isolation chamber, and the drug path conversion cylinder 1642 has a first connecting chamber 1645 and a second connecting chamber 1645 that is not connected to the first connecting chamber 1645. The second connecting chamber 1646, one end of the first isolation chamber 1643 is connected to the liquid outlet of the medicine circuit valve seat 151, one end of the first connecting chamber 1645 is connected to the other end of the first isolation chamber 1643, the other end of the first connecting chamber 1645 is connected to the lower flow channel 162, one end of the second isolation chamber 1644 is connected to the upper flow channel 161, the other end of the second isolation chamber 1644 is connected to one end of the second connecting chamber 1646, and the other end of the second connecting chamber 1646 is connected to the center hole channel 22 of the isolation column assembly 20.

[0078] Specifically, Figure 8 As shown, in one embodiment, a communication hole 1631 is opened on the outer periphery of the lower oil pipe joint 163 , one end of the communication hole 1631 is communicated with the first communication cavity 1645 , and the other end of the communication hole 1631 is communicated with the lower flow channel 162 .

[0079] Specifically, Figure 4 As shown, in one embodiment, the first drug adding channel 11 includes a radial flow chamber 172, a second conversion chamber 122, an annular space, a flow channel of the electric-controlled drug circuit valve assembly 15, a first isolation chamber 1643, a first connecting chamber 1645, a connecting hole 1631 and a lower flow channel 162, that is, the first drug adding channel 11 is Figure 4 The channel through which the flow path indicated by the straight arrow passes.

[0080] Specifically, Fig.10 As shown, in one embodiment, the second drug addition channel 21 is an annulus channel 23 of the packer string assembly 20 .

[0081] Specifically, Figure 1 and Fig.10As shown, in one embodiment, the packer string assembly 20 includes a central tube 24, a rubber cartridge seat 25, a rubber cartridge assembly 26, a slip assembly 27, a guide assembly 28 and a connecting and stabilizing body assembly 29. The upper end of the central tube 24 is connected to the lower oil pipe joint 163, the rubber cartridge seat 25 is sleeved on the outer circumference of the central tube 24, and the rubber cartridge assembly 26 is sleeved on the outer circumference of the rubber cartridge seat 25. The rubber cartridge assembly 26 is connected below the slip assembly 27, the slip assembly 27 is connected below the guide assembly 28, and the guide assembly 28 is connected below the stabilizing body assembly 29.

[0082] It should be noted that the downhole packer device in the present invention includes an upper oil pipe joint 17, the upper end of the upper oil pipe joint 17 is connected to the production oil pipe (upper oil pipe 100) by a thread, and the lower end is connected to the pressure-bearing cylinder 14, the lower part of the pressure-bearing cylinder 14 is connected to the rubber cylinder seat 25 by a thread, the rubber cylinder seat 25 is externally equipped with a rubber cylinder assembly 26, the lower part of the rubber cylinder assembly 26 is connected to the cava assembly 27, the lower part of the cava assembly 27 is connected to the guide body assembly 28, and the lower part of the guide body assembly 28 is connected to the straightening body assembly 29.

[0083] When the packer device descends to a predetermined depth in the downhole casing 300, the upper oil pipe is rotated, and the center pipe 24 moves downward under the action of the guide groove in the guide body (guide body assembly 28), and the cava assembly 27 is opened and stuck on the downhole casing 300. Under the action of the gravity of the downhole packer device and the oil pipe string, the rubber sleeve assembly 26 is compressed to expand the rubber sleeve to seal the oil pipe.

[0084] Specifically, when the packer device is lowered into the casing to a predetermined depth, the tubing is lifted to a certain height, the oil pipe is rotated clockwise 6-8 times, and the tubing is slowly lowered. The center pipe 24 of the packer device moves downward under the action of the guide groove in the guide body, and the slip assembly 27 is opened and stuck on the inner wall of the casing. The rubber sleeve assembly 26 is compressed by the gravity of the tubing, so that the rubber sleeve expands and closes the oil casing annulus.

[0085] It should be noted that the above-mentioned process of sealing the casing annulus and the working principle of the packer device are prior arts in the art and will not be further described here.

[0086] Specifically, there are many small holes on the outer surface and inner side of the upper oil pipe joint 17 for flow. The upper oil pipe joint 17 is equipped with the first medicine path conversion ring 12, and the inner side is connected to the flow tube 13 by threads. The flow tube 13 is combined with the isolation tube 1531 by threads, and the isolation tube 1531 contains a valve opening motor (valve opening and closing motor 1532), a main control board 1533, and a battery 1534, and is isolated from the medicine path by a sealing cover 1538. The drive shaft in the isolation tube 1531 passes through the movable support 1536 and is connected to the valve core 152, and the valve core 152 is tightly fitted with the valve core 152 by a spring through the movable support 1536. The medicine path valve seat 151 is connected to the medicine path conversion tube 1642 by threads, and the medicine path conversion tube 1642 contains the medicine path conversion ring body 1641 and is connected to the lower oil pipe joint 163 by threads, and the lower oil pipe joint 163 is connected to the center pipe 24 by threads.

[0087] When adding medicine, the medicine solution flows into the interior of the packer device through the small hole on the outer surface of the upper oil pipe joint 17, and then flows into the first medicine path conversion ring 12 from the inner hole of the upper oil pipe joint 17, and flows into the flow tube 13 from the first medicine path conversion ring 12 and reaches the valve core 152. When the valve core 152 is opened under the drive of the valve opening and closing motor, the medicine solution enters the second medicine path conversion ring 164, and enters the outer medicine path annulus through the second medicine path conversion ring 164 again, and then flows through the gap between the rubber tube seat and the central tube 24 to enter the bottom of the sealing rubber tube (included in the rubber tube assembly 26), realizing the automatic filling of the medicine solution. The entire medicine solution filling process is automatically completed without human intervention, and the program can also be set to control the valve to open automatically at regular intervals, which greatly reduces the cost of manpower and material resources and improves the economic benefits of oil production.

[0088] Specifically, the valve opening and closing motor, under the control of the main control board 1533, controls the opening time to achieve accurate control of the dosage of the medicine, thereby avoiding the waste of medicine due to excessive addition of medicine, saving the cost of medicine, and also avoiding the waxing, scaling, excessive corrosion, reduced oil production, increased maintenance costs, and reduced economic benefits caused by insufficient addition of medicine.

[0089] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A downhole packer device, characterized in that: include: An automatic dosing column assembly, the upper end of which is connected to the upper oil pipe, and a first dosing channel is provided in the automatic dosing column assembly; as well as A packer string assembly, the upper end of which is connected to the lower end of the automatic dosing string assembly, a second dosing channel is provided in the packer string assembly, and one end of the second dosing channel is connected to the first dosing channel; The packer string assembly can seal the casing annulus between the downhole casing and the upper oil pipe at a preset sealing position in the downhole casing, the other end of the second dosing channel is connected to the downhole casing, and the automatic dosing string assembly can automatically transport the drug solution therein to the downhole casing through the first dosing channel and the second dosing channel in sequence; The automatic dosing column assembly comprises: An upper oil pipe joint, the upper end of which is connected to the lower end of the upper oil pipe, the upper oil pipe joint has an axial flow cavity for conveying oil and a radial flow cavity that is not connected to the axial flow cavity, one end of the axial flow cavity is connected to the central hole channel of the upper oil pipe, and the radial flow cavity is used to add a pharmaceutical solution; A first drug path conversion ring, which is arranged on the upper oil pipe joint; A flow tube, the upper end of which is connected to the lower end of the upper oil pipe joint; A pressure-bearing cylinder is sleeved on the outer circumference of the flow cylinder, the upper end of the pressure-bearing cylinder is connected to the lower end of the upper oil pipe joint, the lower end of the pressure-bearing cylinder is connected to the upper end of the packer string assembly, and an annular flow channel is provided between the pressure-bearing cylinder and the flow cylinder; an electrically controlled drug circuit valve assembly, one end of which is connected to the other end of the flow tube, and the electrically controlled drug circuit valve assembly is at least partially located in the pressure-bearing tube; and A second drug path conversion ring assembly is disposed in the pressure-bearing cylinder, one end of the second drug path conversion ring assembly is connected to the other end of the electric-controlled drug path valve assembly, and the other end of the second drug path conversion ring assembly is connected to the packer string assembly; Among them, the second drug path conversion ring assembly separates the annular flow channel between it and the pressure tube into an upper flow channel and a lower flow channel, the upper flow channel is connected with the annular space flow channel, and the lower flow channel is connected with the annular space channel of the isolation device tubing string assembly, the first drug path conversion ring is used to connect the axial flow cavity with the annular space flow channel, and to connect the radial flow cavity with the central hole channel of the flow tube, the electrically controlled drug path valve assembly is used to control the liquid flow rate flowing out of the central hole channel, the second drug path conversion ring assembly is used to connect the central hole channel of the flow tube with the lower flow channel, and to connect the upper flow channel with the central hole channel of the isolation device tubing string assembly.

2. The downhole packer device according to claim 1, characterized in that: The first drug path conversion ring is arranged in the upper oil pipe joint, and a connecting channel is arranged in the upper oil pipe joint. One end of the connecting channel is connected to the first drug path conversion ring, and the other end of the connecting channel is connected to the annular space flow channel. The first drug path conversion ring is used to connect the axial flow cavity with the connecting channel.

3. The downhole packer device according to claim 2, characterized in that: A first conversion chamber and a second conversion chamber that is not connected to the first conversion chamber are provided in the first drug path conversion ring. One end of the first conversion chamber is connected to the axial flow chamber, and the other end thereof is connected to the connecting channel. One end of the second conversion chamber is connected to the radial flow chamber, and the other end thereof is connected to the central channel of the flow cylinder.

4. The downhole packer device according to claim 3, characterized in that: The electronically controlled medicine circuit valve assembly comprises: a medicine path valve seat, one end of which is connected to the lower end of the flow tube, the other end of which is connected to one end of the second medicine path conversion ring assembly, and a first flow hole is provided in the medicine path valve seat; and A valve core is rotatably disposed in the medicine path valve seat, and a second flow hole is disposed on the valve core; and An electric drive assembly connected to the valve core, the electric drive assembly is used to control the rotation of the valve core, and the electric drive assembly is arranged in the flow cylinder; The overlap between the first flow hole and the second flow hole can be adjusted by rotating the valve core to control the flow of the electronically controlled drug circuit valve assembly.

5. The downhole packer device according to claim 4, characterized in that: The electric drive assembly comprises: an isolating cylinder, which is fixed in the flow cylinder, and the isolating cylinder is not connected with the flow cylinder; and A valve opening and closing motor is disposed in the isolation cylinder, and a driving shaft of the valve opening and closing motor extends out of the isolation cylinder and is connected to the valve core; and A sealing member, which is sleeved on the driving shaft and is used to seal the gap between the driving shaft and the isolation cylinder; a main control board, which is disposed in the isolation cylinder and is electrically connected to the valve opening and closing motor, and is used to control the rotation of the valve opening and closing motor; and A battery, which is arranged in the isolation cylinder and is electrically connected to the main control board and the valve opening and closing motor, and the battery is used to supply power to the main control board and the valve opening and closing motor; Wherein, the pharmaceutical solution flows into the drug circuit valve seat from the annular space between the isolation cylinder and the flow cylinder.

6. The downhole packer device according to claim 5, characterized in that: The second drug route conversion ring assembly comprises: A lower oil pipe joint, which is arranged in the pressure-bearing cylinder, and the lower end of the lower oil pipe joint is connected to the central hole channel of the packer pipe string assembly; and A second drug circuit conversion ring, one end of which is connected to the other end of the electric-controlled drug circuit valve assembly, and the other end of the second drug circuit conversion ring is arranged in the lower oil pipe joint; Among them, there is an annular channel between the second drug path conversion ring and the lower oil pipe joint, one end of the annular channel is connected to the second drug path conversion ring, and the other end is connected to the lower flow channel. The second drug path conversion ring is used to connect the central hole channel of the flow tube with the annular channel, and to connect the upper flow channel with the central hole channel of the isolation device pipe string assembly.

7. The downhole packer device according to claim 6, characterized in that: The second drug route conversion ring is a split structure, which includes: a medicine path conversion ring body, which is disposed in the lower oil pipe joint; and A medicine path conversion cylinder is seated on the lower oil pipe joint, one end of the medicine path conversion cylinder is connected to the medicine path valve seat, and the other end thereof is pressed tightly on the medicine path conversion ring body; Among them, the drug path conversion ring body is provided with a first isolation chamber and a second isolation chamber not connected with the first isolation chamber, the drug path conversion cylinder is provided with a first connecting chamber and a second connecting chamber not connected with the first connecting chamber, one end of the first isolation chamber is connected with the liquid outlet of the drug path valve seat, one end of the first connecting chamber is connected with the other end of the first isolation chamber, the other end of the first connecting chamber is connected with the lower flow channel, one end of the second isolation chamber is connected with the upper flow channel, the other end of the second isolation chamber is connected with one end of the second connecting chamber, and the other end of the second connecting chamber is connected with the center hole channel of the isolation device tubing assembly.

8. The downhole packer device according to claim 7, characterized in that: A communication hole is formed on the outer circumference of the lower oil pipe joint, one end of the communication hole is communicated with the first communication cavity, and the other end of the communication hole is communicated with the lower flow channel.

9. The downhole packer device according to claim 8, characterized in that: The first dosing channel includes the radial flow chamber, the second conversion chamber, the annular space, the flow channel of the electrically controlled drug circuit valve assembly, the first isolation chamber, the first connecting chamber, the connecting hole and the lower flow channel, and the second dosing channel is the annular space channel of the isolation device tubing assembly.

Images