Wax prevention device and production string for condensate gas well

Abstract

The present invention provides a wax prevention device and a production pipe string for a condensate gas well, and relates to oil and gas production technology. The wax prevention device for a condensate gas well provided by the present invention is provided with a wax prevention pipe body connected between a packer and a screen pipe, and a wax prevention agent is provided in the wax prevention pipe body, so that during the production process, the condensate gas in the formation enters the wax prevention pipe body through the screen pipe, and contacts and reacts with the wax prevention agent in the wax prevention pipe body, thereby reducing the wax precipitation point of the condensate wax and the solidification point of the condensate oil, thereby playing a wax prevention role, reducing the blockage phenomenon during the production process, and facilitating the improvement of the production capacity of the condensate gas well.

Description

Technical Field

[0001] The invention relates to oil and gas production technology, and in particular to a wax prevention device and a production pipe column for a condensate gas well. Background Art

[0002] Condensate gas reservoirs are a complex type of special oil and gas reservoirs between oil reservoirs and pure gas reservoirs, located in rocks thousands of meters underground.

[0003] Condensate gas reservoirs exist in the form of gas under the original formation temperature and pressure; during the production process, as the formation pressure continues to decrease, the heavy hydrocarbons in the gas phase will undergo a phase change, and condensate oil will precipitate in the formation, forming a gas-liquid two-phase system, namely natural gas and condensate oil.

[0004] However, during the production process, when the formation pressure is lower than the wax precipitation point and dew point pressure, wax will precipitate along with the condensate oil. The wax precipitated with the condensate oil will adhere to the inner wall of the wellbore and gradually block the wellbore, resulting in a decrease in the production capacity of the condensate gas well. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, the present invention provides a wax prevention device and a production string for condensate gas wells, which can reduce the wax precipitation point of condensate wax and the solidification point of condensate oil, thereby playing an anti-wax effect, reducing blockages in the production process, and helping to improve the production capacity of condensate gas wells.

[0006] The first aspect of the present invention is to provide a wax prevention device for condensate gas wells, comprising: an anti-wax pipe body, the upper end of the anti-wax pipe body is used to connect to a packer, the lower end of the anti-wax pipe body is used to connect to a screen pipe, and an installation space is formed in the anti-wax pipe body, and the installation space is used to install an anti-wax agent.

[0007] Optionally, the anti-wax pipe body includes: an upper pipe body, the upper end of which is used to connect with the sealer, and the installation space is formed in the upper pipe body; a lower pipe body, which is connected to the lower end of the upper pipe body, the lower pipe body is sealed with the upper pipe body, and the lower end of the lower pipe body is used to connect with the screen pipe.

[0008] Optionally, a mounting seat is formed at the lower end of the upper tube body, a lower mesh partition is arranged on the mounting seat, an upper mesh partition is also arranged in the upper tube body, and the mounting space is formed between the upper mesh partition and the lower mesh partition.

[0009] Optionally, a mounting groove is provided on the inner wall of the upper tube body, and the upper mesh partition is installed in the mounting groove.

[0010] Optionally, a guide surface is formed on the outer edge of the upper mesh partition, and the guide surface is inclined from top to bottom toward the central axis of the upper tube body.

[0011] Optionally, the lower end of the mounting seat forms an abutment surface for abutting against a pitched ball.

[0012] Optionally, the lower end of the upper tube body is inserted into the lower tube body, and the upper tube body is fixed to the lower tube body by a plurality of pins.

[0013] Optionally, at least some of the plurality of pins are evenly distributed along the circumference of the lower tube body.

[0014] Optionally, at least some of the plurality of pins are distributed at intervals along the axial direction of the lower tube body.

[0015] Another aspect of the present invention is to provide a production tubing for condensate gas wells, comprising: an oil pipe, on which a packer and a screen are arranged, and an anti-wax device is arranged between the packer and the screen, wherein the anti-wax device is the anti-wax device for condensate gas wells as described in any of the aforementioned items.

[0016] The anti-wax device for condensate gas wells provided by the present invention comprises an anti-wax pipe body connected between a packer and a screen pipe, and an anti-wax agent is arranged in the anti-wax pipe body. Thus, during the production process, condensate gas in the formation enters the anti-wax pipe body through the screen pipe, and contacts and reacts with the anti-wax agent in the anti-wax pipe body, thereby reducing the wax precipitation point of the condensate wax and the solidification point of the condensate oil, thereby playing an anti-wax role, reducing blockage in the production process, and facilitating improving the production capacity of the condensate gas well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 A schematic diagram of the structure of a paraffin prevention device for a condensate gas well provided in the first embodiment;

[0019] Figure 2 A schematic diagram of the structure of an upper pipe body in a wax prevention device for a condensate gas well provided in the first embodiment;

[0020] Figure 3 A schematic diagram of the structure of the lower pipe body in the wax prevention device for condensate gas wells provided in the first embodiment;

[0021] Figure 4 A schematic diagram of the distribution of pins in the paraffin prevention device for condensate gas wells provided in the first embodiment.

[0022] Description of reference numerals:

[0023] 1- Wax-proof tube body;

[0024] 1a-Installation space;

[0025] 11-Upper tube body;

[0026] 111-installation slot;

[0027] 112-mounting seat;

[0028] 112a- abutment surface;

[0029] 113-blind hole;

[0030] 12-lower tube body;

[0031] 121-through hole;

[0032] 13-Internet access;

[0033] 14-lower mesh partition;

[0034] 15-pin;

[0035] 16-Sealing ring.

[0036] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] The terms "upper" and "lower" etc. are used to describe the relative position relationship of each structure in the accompanying drawings, which is only for the convenience of description and is not intended to limit the scope of implementation of the present invention. Changes or adjustments to the relative relationship shall be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In addition, in the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiment 1

[0043] Figure 1 This is a schematic structural diagram of a paraffin prevention device for a condensate gas well provided in the first embodiment.

[0044] Please refer to Figure 1 The present embodiment provides a wax prevention device for a condensate gas well, comprising: an anti-wax pipe body 1, the upper end of the anti-wax pipe body 1 is used to connect with a packer, the lower end of the anti-wax pipe body 1 is used to connect with a screen pipe, and the anti-wax pipe body 1 can be connected with the packer and the screen pipe; an installation space 1a is formed in the anti-wax pipe body 1, and the installation space 1a is used to install an anti-wax agent.

[0045] The anti-wax pipe body 1 is specifically a hollow pipe body. The upper end of the anti-wax pipe body 1 can be provided with an external thread to facilitate the threaded connection with the seal at its upper end, and at the same time, it is convenient to subsequently disassemble the anti-wax pipe body 1 from the seal; the lower end of the anti-wax pipe body 1 can be provided with an internal thread to facilitate the threaded connection with the screen tube at its lower end, and at the same time, it is convenient to subsequently disassemble the anti-wax pipe body 1 from the screen tube.

[0046] The hollow part of the wax-proofing tube body 1 forms an installation space 1a for installing the wax-proofing agent. The wax-proofing agent can be a columnar solid wax-proofing agent. The wax-proofing agent can be installed in the installation space 1a by bonding, clamping, or interference fit. The shape of the wax-proofing agent can be adapted to the shape of the installation space 1a to facilitate the installation of the wax-proofing agent; for example, when the installation space 1a is cylindrical, the wax-proofing agent is also cylindrical.

[0047] Of course, the structure of the wax resist is not limited to this, and this embodiment is just an example.

[0048] The anti-wax device for condensate gas wells provided in this embodiment is provided with an anti-wax pipe body 1 for connecting between the sealer and the screen pipe, and an anti-wax agent is provided in the anti-wax pipe body 1. Therefore, during the production process, the condensate gas in the formation enters the anti-wax pipe body 1 through the screen pipe, and contacts and reacts with the anti-wax agent in the anti-wax pipe body 1, thereby reducing the wax precipitation point of the condensate wax and the solidification point of the condensate oil, thereby playing an anti-wax role, reducing the blockage phenomenon during the production process, and helping to improve the production capacity of the condensate gas well.

[0049] Figure 2 A schematic diagram of the structure of an upper pipe body in a wax prevention device for a condensate gas well provided in the first embodiment; Figure 3 A schematic diagram of the structure of the lower pipe body in the wax prevention device for condensate gas wells provided in the first embodiment; Figure 4 A schematic diagram of the distribution of pins in the paraffin prevention device for condensate gas wells provided in the first embodiment.

[0050] Please refer to Figure 2-4 , and continue to refer to Figure 1 Optionally, the wax-proof pipe body 1 includes: an upper pipe body 11, the upper end of the upper pipe body 11 is used to connect with the packer, and an installation space 1a is formed in the upper pipe body 11; a lower pipe body 12, the lower pipe body 12 is connected to the lower end of the upper pipe body 11, the lower pipe body 12 is sealed with the upper pipe body 11, and the lower end of the lower pipe body 12 is used to connect with the screen pipe.

[0051] Among them, the upper tube body 11 is a hollow tube body, and the upper tube body 11 can be connected to the packer; the upper end of the upper tube body 11 can be provided with an external thread to facilitate the threaded connection with the packer at its upper end, and at the same time, it is convenient for the subsequent disassembly of the anti-wax tube body 1 and the packer.

[0052] The lower tube body 12 is a hollow tube body, which is connected to the upper tube body 11 and the screen tube; the lower end of the lower tube body 12 can be provided with an internal thread to facilitate threaded connection with the screen tube at its lower end, and at the same time, facilitate the subsequent disassembly of the lower tube body 12 and the screen tube.

[0053] In addition, the lower tube body 12 is also sealed with the upper tube body 11 through at least one sealing ring 16 to prevent oil and gas leakage.

[0054] In this embodiment, by providing the anti-wax tube body 1 with a separate upper tube body 11 and a lower tube body 12, when blockage occurs in the anti-wax tube body 1, the fixed connection between the upper tube body 11 and the lower tube body 12 is destroyed, and the oil and gas flow channel is re-established to achieve unblocking.

[0055] Optionally, a lower mesh partition 14 is provided at the lower end of the upper tube body 11 , and an upper mesh partition 13 is further provided in the upper tube body 11 , and an installation space 1a is formed between the upper mesh partition 13 and the lower mesh partition 14 .

[0056] The upper screen 13 can be made of metal, specifically, a high-strength aluminum alloy, to increase the service life of the upper screen 13. A plurality of flow holes are evenly arranged on the upper screen 13, through which the condensate gas in the formation can pass. It can be understood that the aperture of the flow hole needs to be smaller than the minimum diameter allowed by the wax inhibitor to pass, so as to better protect the wax inhibitor and reduce the blockage phenomenon in the wax inhibitor.

[0057] The upper mesh partition 13 can be fixed to the upper tube body 11 by interference fit, snap connection, etc., so as to more reliably confine the wax inhibitor between the upper mesh partition 13 and the lower mesh partition 14 .

[0058] For example, a mounting groove 111 is provided on the inner wall of the upper tube body 11, and the upper screen 13 is installed in the mounting groove 111. A guide surface is formed on the outer edge of the upper screen 13, and the guide surface is inclined from top to bottom toward the central axis of the upper tube body 11, so as to facilitate the cooperation between the upper screen 13 and the mounting groove 111.

[0059] In the specific implementation process, the guide surface can be a slope, in which case the guide surface gradually tilts inward from top to bottom; or, the guide surface can be an arcuate surface, and the outer diameter of the upper end of the upper partition 13 is greater than the outer diameter of the lower end of the upper partition 13.

[0060] The lower screen 14 can also be made of metal, specifically, a high-strength aluminum alloy, to increase the service life of the lower screen 14. A plurality of flow holes are evenly arranged on the lower screen 14, through which the condensate gas in the formation can pass. It can be understood that the aperture of the flow hole needs to be smaller than the minimum diameter allowed by the wax inhibitor to pass, so as to better protect the wax inhibitor and reduce the blockage phenomenon in the wax inhibitor.

[0061] The lower mesh partition 14 can also be fixed to the upper tube body 11 by interference fit, snap connection, etc., so as to more reliably confine the wax inhibitor between the upper mesh partition 13 and the lower mesh partition 14 .

[0062] Optionally, a mounting seat 112 is formed at the lower end of the upper tube body 11 , and the mounting seat 112 can be integrally provided with the upper tube body 11 ; the lower mesh partition 14 can be mounted on the mounting seat 112 , so as to simplify the assembly process of the anti-wax device.

[0063] In this embodiment, the anti-wax agent can also be honeycomb-shaped and clamped between the upper mesh partition 13 and the lower mesh partition 14, so as to facilitate the condensate gas in the formation to pass smoothly through the anti-wax agent in the installation space 1a, thereby alleviating the blockage phenomenon in the anti-wax device; or, the anti-wax agent can also be evenly mixed with expanded clay and filled between the upper mesh partition 13 and the lower mesh partition 14, so as to facilitate the condensate gas in the formation to pass smoothly through the anti-wax agent in the installation space 1a, thereby alleviating the blockage phenomenon in the anti-wax device.

[0064] In addition, the lower end of the mounting seat 112 may also form an abutment surface 112a for abutting against the pitched ball. The surface of the lower end of the mounting seat 112 is inclined downward from the side facing the central axis of the upper tube body 11 to the side away from the central axis of the upper tube body 11, and forms the abutment surface 112a to better contact and cooperate with the pitched ball; the abutment surface 112a may specifically be an inclined surface or an arc surface.

[0065] When blockage occurs in the anti-wax tube body 1, a ball is thrown into the anti-wax tube body 1. The ball can abut against the abutment surface 112a of the mounting seat 112 and push the upper tube body 11 upward, thereby destroying the fixed connection between the upper tube body 11 and the lower tube body 12, so that the oil and gas flow channel can be re-established and the blockage can be unblocked.

[0066] Optionally, the lower end of the upper tube body 11 is inserted into the lower tube body 12 , and the upper tube body 11 is fixed to the lower tube body 12 via a plurality of pins 15 .

[0067] The lower tube body 12 is provided with a through hole 121 for installing the pin 15, and the upper tube body 11 is provided with a blind hole 113 for installing the pin 15, so as to prevent oil and gas from leaking between the pin 15 and the upper tube body 11. The pin 15 can be interference-fitted with at least one of the through hole 121 on the lower tube body 12 and the blind hole 113 on the upper tube body 11, so as to ensure the installation reliability of the pin 15.

[0068] In this embodiment, when blockage occurs in the anti-wax tube body 1, a ball is thrown into the anti-wax tube body 1. The ball can abut against the abutment surface 112a of the mounting seat 112 and push the upper tube body 11 upward, thereby cutting off the pin 15 connecting the upper tube body 11 and the lower tube body 12, so that the oil and gas flow channel can be re-established and the blockage can be unblocked.

[0069] In a specific implementation process, a plurality of pins 15 may be evenly distributed along the circumference of the lower tube 12 to ensure the connection reliability between the upper tube 11 and the lower tube 12. And / or, at least two of the pins 15 are spaced apart along the axial direction of the lower tube 12 to ensure the connection reliability between the upper tube 11 and the lower tube 12.

[0070] For example, four pins 15 are evenly distributed along the circumference of the lower tube 12, and two circles of pins 15 are arranged at intervals along the axial direction of the lower tube 12, that is, the lower tube 12 is connected to the upper tube 11 through eight pins 15. The upper and lower circles of pins 15 arranged at intervals along the axial direction of the lower tube 12 can be arranged in an overlapping manner or in an alternating manner.

[0071] Of course, the number and arrangement of the pins 15 are not limited to this, and this embodiment is only used as an example.

[0072] Embodiment 2

[0073] Please continue to refer to Figure 1-4 This embodiment provides a production string for a condensate gas well, including: an oil pipe, a packer and a screen are arranged on the oil pipe, and a wax prevention device is arranged between the packer and the screen.

[0074] Among them, the anti-wax device includes an anti-wax pipe body 1, the upper end of the anti-wax pipe body 1 is used to connect with the seal, the lower end of the anti-wax pipe body 1 is used to connect with the screen pipe, and the anti-wax pipe body 1 can be connected with the seal and the screen pipe; an installation space 1a is formed in the anti-wax pipe body 1, and the installation space 1a is used to install the anti-wax agent.

[0075] The anti-wax pipe body 1 is specifically a hollow pipe body. The upper end of the anti-wax pipe body 1 can be provided with an external thread to facilitate the threaded connection with the seal at its upper end, and at the same time, it is convenient to subsequently disassemble the anti-wax pipe body 1 from the seal; the lower end of the anti-wax pipe body 1 can be provided with an internal thread to facilitate the threaded connection with the screen tube at its lower end, and at the same time, it is convenient to subsequently disassemble the anti-wax pipe body 1 from the screen tube.

[0076] The hollow part of the wax-proofing tube body 1 forms an installation space 1a for installing the wax-proofing agent. The wax-proofing agent can be a columnar solid wax-proofing agent. The wax-proofing agent can be installed in the installation space 1a by bonding, clamping, or interference fit. The shape of the wax-proofing agent can be adapted to the shape of the installation space 1a to facilitate the installation of the wax-proofing agent; for example, when the installation space 1a is cylindrical, the wax-proofing agent is also cylindrical.

[0077] Of course, the structure of the wax resist is not limited to this, and this embodiment is just an example.

[0078] Optionally, the wax-proof pipe body 1 includes: an upper pipe body 11, the upper end of the upper pipe body 11 is used to connect to the packer, and an installation space 1a is formed in the upper pipe body 11; a lower pipe body 12, the lower pipe body 12 is connected to the lower end of the upper pipe body 11, the lower pipe body 12 is sealed with the upper pipe body 11, and the lower end of the lower pipe body 12 is used to connect to the screen pipe.

[0079] Among them, the upper tube body 11 is a hollow tube body, and the upper tube body 11 can be connected to the packer; the upper end of the upper tube body 11 can be provided with an external thread to facilitate the threaded connection with the packer at its upper end, and at the same time, it is convenient for the subsequent disassembly of the anti-wax tube body 1 and the packer.

[0080] The lower tube body 12 is a hollow tube body, which is connected to the upper tube body 11 and the screen tube; the lower end of the lower tube body 12 can be provided with an internal thread to facilitate threaded connection with the screen tube at its lower end, and at the same time, facilitate the subsequent disassembly of the lower tube body 12 and the screen tube.

[0081] In addition, the lower tube body 12 is also sealed with the upper tube body 11 through at least one sealing ring 16 to prevent oil and gas leakage.

[0082] In this embodiment, by providing the anti-wax tube body 1 with a separate upper tube body 11 and a lower tube body 12, when blockage occurs in the anti-wax tube body 1, the fixed connection between the upper tube body 11 and the lower tube body 12 is destroyed, and the oil and gas flow channel is re-established to achieve unblocking.

[0083] Optionally, a lower mesh partition 14 is provided at the lower end of the upper tube body 11 , and an upper mesh partition 13 is further provided in the upper tube body 11 , and an installation space 1a is formed between the upper mesh partition 13 and the lower mesh partition 14 .

[0084] The upper screen 13 can be made of metal, specifically, a high-strength aluminum alloy, to increase the service life of the upper screen 13. A plurality of flow holes are evenly arranged on the upper screen 13, through which the condensate gas in the formation can pass. It can be understood that the aperture of the flow hole needs to be smaller than the minimum diameter allowed by the wax inhibitor to pass, so as to better protect the wax inhibitor and reduce the blockage phenomenon in the wax inhibitor.

[0085] The upper mesh partition 13 can be fixed to the upper tube body 11 by interference fit, snap connection, etc., so as to more reliably confine the wax inhibitor between the upper mesh partition 13 and the lower mesh partition 14 .

[0086] For example, a mounting groove 111 is provided on the inner wall of the upper tube body 11, and the upper screen 13 is installed in the mounting groove 111. A guide surface is formed on the outer edge of the upper screen 13, and the guide surface is inclined from top to bottom toward the central axis of the upper tube body 11, so as to facilitate the cooperation between the upper screen 13 and the mounting groove 111.

[0087] In the specific implementation process, the guide surface can be a slope, in which case the guide surface gradually tilts inward from top to bottom; or, the guide surface can be an arcuate surface, and the outer diameter of the upper end of the upper partition 13 is greater than the outer diameter of the lower end of the upper partition 13.

[0088] The lower screen 14 can also be made of metal, specifically, a high-strength aluminum alloy, to increase the service life of the lower screen 14. A plurality of flow holes are evenly arranged on the lower screen 14, through which the condensate gas in the formation can pass. It can be understood that the aperture of the flow hole needs to be smaller than the minimum diameter allowed by the wax inhibitor to pass, so as to better protect the wax inhibitor and reduce the blockage phenomenon in the wax inhibitor.

[0089] The lower mesh partition 14 can also be fixed to the upper tube body 11 by interference fit, snap connection, etc., so as to more reliably confine the wax inhibitor between the upper mesh partition 13 and the lower mesh partition 14 .

[0090] Optionally, a mounting seat 112 is formed at the lower end of the upper tube body 11 , and the mounting seat 112 can be integrally provided with the upper tube body 11 ; the lower mesh partition 14 can be mounted on the mounting seat 112 , so as to simplify the assembly process of the anti-wax device.

[0091] In this embodiment, the anti-wax agent can also be honeycomb-shaped and clamped between the upper mesh partition 13 and the lower mesh partition 14, so as to facilitate the condensate gas in the formation to pass smoothly through the anti-wax agent in the installation space 1a, thereby alleviating the blockage phenomenon in the anti-wax device; or, the anti-wax agent can also be evenly mixed with expanded clay and filled between the upper mesh partition 13 and the lower mesh partition 14, so as to facilitate the condensate gas in the formation to pass smoothly through the anti-wax agent in the installation space 1a, thereby alleviating the blockage phenomenon in the anti-wax device.

[0092] In addition, the lower end of the mounting seat 112 may also form an abutment surface 112a for abutting against the pitched ball. The surface of the lower end of the mounting seat 112 is inclined downward from the side facing the central axis of the upper tube body 11 to the side away from the central axis of the upper tube body 11, and forms the abutment surface 112a to better contact and cooperate with the pitched ball; the abutment surface 112a may specifically be an inclined surface or an arc surface.

[0093] When blockage occurs in the anti-wax tube body 1, a ball is thrown into the anti-wax tube body 1. The ball can abut against the abutment surface 112a of the mounting seat 112 and push the upper tube body 11 upward, thereby destroying the fixed connection between the upper tube body 11 and the lower tube body 12, so that the oil and gas flow channel can be re-established and the blockage can be unblocked.

[0094] Optionally, the lower end of the upper tube body 11 is inserted into the lower tube body 12 , and the upper tube body 11 is fixed to the lower tube body 12 via a plurality of pins 15 .

[0095] The lower tube body 12 is provided with a through hole 121 for installing the pin 15, and the upper tube body 11 is provided with a blind hole 113 for installing the pin 15, so as to prevent oil and gas from leaking between the pin 15 and the upper tube body 11. The pin 15 can be interference-fitted with at least one of the through hole 121 on the lower tube body 12 and the blind hole 113 on the upper tube body 11, so as to ensure the installation reliability of the pin 15.

[0096] In this embodiment, when blockage occurs in the anti-wax tube body 1, a ball can be thrown into the anti-wax tube body 1. The thrown ball can abut against the abutment surface 112a of the mounting seat 112 and push the upper tube body 11 upward, thereby shearing off the pin 15 connecting the upper tube body 11 and the lower tube body 12, so that the oil and gas flow channel can be re-established and the blockage can be unblocked.

[0097] In a specific implementation process, a plurality of pins 15 may be evenly distributed along the circumference of the lower tube 12 to ensure the connection reliability between the upper tube 11 and the lower tube 12. And / or, at least two of the pins 15 are spaced apart along the axial direction of the lower tube 12 to ensure the connection reliability between the upper tube 11 and the lower tube 12.

[0098] For example, four pins 15 are evenly distributed along the circumference of the lower tube 12, and two circles of pins 15 are arranged at intervals along the axial direction of the lower tube 12, that is, the lower tube 12 is connected to the upper tube 11 through eight pins 15. The upper and lower circles of pins 15 arranged at intervals along the axial direction of the lower tube 12 can be arranged in an overlapping manner or in an alternating manner.

[0099] Of course, the number and arrangement of the pins 15 are not limited to this, and this embodiment is only used as an example.

[0100] The production string for condensate gas wells provided in this embodiment is provided with an anti-wax pipe body 1 for connecting between the sealer and the screen pipe, and an anti-wax agent is provided in the anti-wax pipe body 1. Therefore, during the production process, the condensate gas in the formation enters the anti-wax pipe body 1 through the screen pipe, and contacts and reacts with the anti-wax agent in the anti-wax pipe body 1, thereby reducing the wax precipitation point of the condensate wax and the solidification point of the condensate oil, thereby playing an anti-wax role, reducing the blockage phenomenon during the production process, and helping to improve the production capacity of the condensate gas well.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A paraffin prevention device for a condensate gas well, characterized in that: include: A wax-proof pipe body, wherein the upper end of the wax-proof pipe body is used to be connected to a packer, and the lower end of the wax-proof pipe body is used to be connected to a screen pipe, and an installation space is formed in the wax-proof pipe body, and the installation space is used to install a wax-proof agent; wherein the shape of the wax-proof agent is adapted to the shape of the installation space; The wax-proof pipe body comprises: an upper pipe body, the upper end of which is used to connect with the packer, and the installation space is formed in the upper pipe body; a lower pipe body, which is connected to the lower end of the upper pipe body, the lower pipe body is sealed with the upper pipe body, and the lower end of the lower pipe body is used to connect with the screen pipe; The lower end of the upper tube body is formed with a mounting seat; the lower end of the mounting seat is formed with an abutment surface for abutting against a pitched ball; the lower end of the upper tube body is inserted into the lower tube body, and the upper tube body is fixed to the lower tube body by a plurality of pins; A lower mesh partition is arranged on the mounting seat, and an upper mesh partition is also arranged in the upper tube body, and the mounting space is formed between the upper mesh partition and the lower mesh partition; a mounting groove is arranged on the inner wall of the upper tube body, and the upper mesh partition is installed in the mounting groove; wherein the upper mesh partition and the lower mesh partition are made of metal.

2. The paraffin prevention device for condensate gas wells according to claim 1, characterized in that: The outer edge of the upper mesh partition is formed with a guide surface, and the guide surface is inclined from top to bottom toward the central axis of the upper tube body.

3. The paraffin prevention device for condensate gas wells according to claim 1, characterized in that: At least part of the plurality of pins are evenly distributed along the circumference of the lower tube body.

4. The paraffin prevention device for condensate gas wells according to claim 1, characterized in that: At least some of the plurality of pins are distributed at intervals along the axial direction of the lower tube.

5. A production string for a condensate gas well, characterized in that: include: An oil pipe, wherein a packer and a screen are arranged on the oil pipe, and an anti-wax device is arranged between the packer and the screen, wherein the anti-wax device is the anti-wax device for condensate gas wells as described in any one of claims 1 to 4.

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