Packing piston, hydrogeological well completion subsection well washing device and well washing method
The well washing energy is concentrated on the target well section through the enclosed piston technology, which solves the problems of high mechanical impact strength and damage to the aquifer when dealing with the aquifer, and achieves efficient and accurate deep cleaning.
Patent Information
- Application Number
- CN202510501119.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-05-23
AI Technical Summary
When traditional piston well washing technology treats aquifer, the mechanical impact strength is high, making it difficult to focus on the key blocking strata, and reduces the water conduction capacity of the aquifer, causing certain damage.
The sealing piston technology is adopted to concentrate the well washing energy on the target well section through the segmented sealing piston, and the liquid flow is controlled by using the switch parts to reduce disturbance to the deep aquifer and ensure the cleaning range is accurate and controllable.
It improves the efficiency of deep cleaning, reduces damage to the aquifer, ensures the cleaning effect while avoiding waste of water resources.
Smart Images
Figure CN120026839A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of well washing, and in particular to a sealing piston, a hydrogeological well formation segmented well washing device and a well washing method. Background Art
[0002] Well washing refers to the process in which, due to engineering needs, during the well repair operation, the well washing medium is injected through the wellbore or drill pipe by the pumping equipment to carry the substances (liquid phase, solid phase, gas phase) in the wellbore to the ground, thereby changing the medium properties in the wellbore to meet the operation requirements. Segmented well washing is to move the pipeline to a certain distance from the top of the filter tube, then add clean water to the inside of the filter tube, and then drive the pipeline and the external piston to reciprocate within a certain range inside the filter tube, so as to clean the filter tube range, thereby cleaning the silt and other impurities on the inner wall of the filter tube.
[0003] The traditional piston well-washing technology is limited in single piston stroke, resulting in energy dispersion, making it difficult to focus on key blocked layers. In addition, the risk of aquifer structure disturbance is high. When traditional piston well-washing is operated frequently in loose aquifers, strong pressure pulses compress the pores of deep weakly cemented formations, reducing the water conductivity of the aquifer and causing certain damage to the aquifer. Summary of the invention
[0004] In order to overcome the above-mentioned shortcomings, the present application provides a sealing piston, a hydrogeological well formation segmented well washing device and a well washing method to reduce the mechanical impact strength, improve the deep cleaning efficiency, and reduce the damage to the aquifer.
[0005] The sealing piston provided in this application adopts the following technical solution: A sealing piston, comprising a first sealing member, a mixing tube, a second sealing member, a connecting rod and a third sealing member which are fixedly connected in sequence along a first direction, wherein the first sealing member, the mixing tube, the second sealing member and the third sealing member are all hollow and through in the first direction, an opening communicating with the interior is formed through a side wall of the mixing tube, a normally closed switch is installed on the third sealing member, the switch is used to open and close the internal space of the third sealing member along the first direction, and the switch is controlled by the pressure difference on both sides; Wherein, when the switch is in the open state, only the liquid on the side of the third sealing member away from the second sealing member is allowed to flow to between the third sealing member and the second sealing member.
[0006] Optionally, the first sealing member, the second sealing member and the third sealing member are rubber sealing rings.
[0007] Optionally, along the first direction, the distance between the first sealing member and the second sealing member and the distance between the second sealing member and the third sealing member are both in the range of 2 to 4 m.
[0008] The present application also provides a hydrogeological well formation and segmented well washing device, which adopts the following technical solution: A hydrogeological well drilling and segmented well washing device comprises a mud pump, a drill pipe, a connecting pipe, a winch and the isolation piston as described above, wherein the drill pipe is hollow and through-going, one end of the connecting pipe is connected to the mud pump, and the other end is connected to the drill pipe, one end of the drill pipe away from the connecting pipe is connected to the first isolation member, and the winch is used to drive the isolation piston to move in a first direction.
[0009] Optionally, the well washing device further comprises a hollow through-connecting head, the connecting head being connected between the drill pipe and the first sealing member, one end of the connecting head being fixedly connected to the first sealing member, and the other end being detachably connected to the drill pipe.
[0010] The present application also provides a method for washing a well using the above-mentioned hydrogeological well-forming segmented washing device, which adopts the following technical solution: A method for washing a well using the hydrogeological well formation and segmented washing device as described above comprises the following steps: S1: Connect the mud pump, connecting pipe, drill pipe, connector and isolation piston in sequence and ensure internal connectivity; S2: lowering the sealing piston into the cleaning target section of the filter tube in the well with the first sealing member being located above the third sealing member, the first sealing member, the second sealing member and the third sealing member all contact with the inner wall of the filter tube and seal the filter tube, a first sealing section is formed between the first sealing member and the second sealing member, and a second sealing section is formed between the second sealing member and the third sealing member; S3: The mud pump injects the flushing liquid containing dispersant at natural pressure, and leaves it to soak to soften the mud skin and filter layer blockage. During the static process, the mud pump inputs pulse pressure to enhance penetration; S4: Let it soak for 2-4 hours; S5: The winch drives the isolation piston to move downward, and the pressure in the space below the isolation piston increases, causing the switch to open upward. The mud pump repeatedly pumps, and the pressure in the space below the isolation piston is greater than the pressure in the space above the isolation piston. The water in the space below the isolation piston flows to the formation through the filter tube. Part of the water flows to the aquifer in the formation, and the other part flows upward along the gap between the filter tube and the formation, and carries mud and fine sand particles through the filter tube to flow into the space above the isolation piston, so that the fine sand particles are discharged to the ground along with the return fluid; S6: The winch drives the isolation piston to move upward, and the pressure in the space below the isolation piston decreases, so that the switch is closed. At this time, the pressure in the space below the isolation piston is less than the pressure of the aquifer in the formation and the pressure in the first sealing section and the second sealing section. The water in the first sealing section and the second sealing section flows through the filter tube to the formation and flows downward, and then flows into the space below the isolation piston through the filter tube. The water in the aquifer also flows into the space below the isolation piston through the filter tube. S7: repeat steps S5-S6 to complete the cleaning of the target segment; S8: The isolation piston of the winch moves to other cleaning target sections in the filter tube, and steps S5 to S6 are repeated until all cleaning target sections in the filter tube are cleaned.
[0011] Optionally, in step S3, the mud pump inputs a pulse pressure with a pressure range of 1.0-2.0 MPa and a frequency range of 0.1-0.2 Hz.
[0012] Optionally, in step S5, the suction pressure range of the mud pump is -0.2 to -0.3 MPa.
[0013] Optionally, in step S5, the flowback liquid that flows back to the ground is precipitated to separate the flushing liquid.
[0014] Optionally, in step S5 to step S6, the reciprocating stroke of the isolation piston is not greater than 6 m.
[0015] In summary, this application at least includes the following beneficial technical effects: The well-washing energy is concentrated by the segmented isolation piston. When the well-washing energy is concentrated on the filter layer and the shallow bottom layer of the well wall in the target well section, it can avoid disturbing the deep aquifer, ensure that the cleaning range is accurately controllable, and ensure the cleaning effect while reducing damage to the aquifer. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the sealing piston in the present invention.
[0017] Figure 2 It is a schematic diagram of the cutaway structure of the isolation piston in the present invention.
[0018] Figure 3 The present invention is a schematic diagram of a hydrogeological well formation and segmented well washing device installed in a well formation.
[0019] Figure 4 yes Figure 3 An enlarged schematic diagram of A in the figure, wherein the switch element is in the open state.
[0020] Figure 5 yes Figure 3An enlarged schematic diagram of A in the figure, wherein the switch element is in the closed state.
[0021] Description of reference numerals: Sealing piston; 11. Connecting head; 12. First sealing member; 13. Mixing tube; 14. Second sealing member; 15. Third sealing member; 16. Switch member; 17. Connecting rod; 18. Opening; 2. Connecting pipe; 3. Mud pump; 4. Filter tube; 5. Gap; 6. First sealing section; 7. Second sealing section; 8. Drill pipe. DETAILED DESCRIPTION
[0022] The present application is further described in detail below in conjunction with the accompanying drawings.
[0023] First of all, piston well-washing technology achieves the dredging of aquifers through the synergy of water hammer effect and seepage action. The piston is used to seal the well pipe, and the piston is pulled back and forth to cause a drastic change in the water head in the closed space, forming an instantaneous alternating positive and negative pressure. The positive pressure shock wave destroys the mud skin and rock debris attachments on the well wall, and the negative pressure suction carries the small particles that penetrate into the aquifer into the well, ultimately achieving the purpose of dredging the aquifer. In this application, by isolating the well pipe in sections, the cleaning energy is increased and concentrated on the target cleaning section to ensure the cleaning effect. The well pipe is then cleaned in sections to reduce the overall impact on the aquifer, improve the efficiency of well washing, and avoid wasting water resources.
[0024] Specifically, the embodiment of the present application discloses a sealing piston 1 for cleaning a well pipe. The sealing piston 1 comprises a first sealing member 12, a mixing tube 13, a second sealing member 14, a connecting rod 17 and a third sealing member 15 which are fixedly connected in sequence along a first direction. Figure 1 and attached Figure 2 As shown, the first sealing member 12, the mixing tube 13, the second sealing member 14 and the third sealing member 15 are all hollow and through in the first direction, and an opening 18 communicating with the interior is formed through the side wall of the mixing tube 13, and a normally closed switch 16 is installed on the third sealing member 15, and the switch 16 is used to open and close the internal space of the third sealing member 15 in the first direction, and the switch 16 is controlled by the pressure difference on both sides. Among them, when the switch 16 is in the open state, only the liquid on the side of the third sealing member 15 away from the second sealing member 14 is allowed to flow to between the third sealing member 15 and the second sealing member 14.
[0025] When the isolation piston 1 is placed in the well pipe to be cleaned, the isolation piston 1 is lowered into the well with the first isolation member 12 located above the third isolation member 15. The first isolation member 12, the second isolation member 14 and the third isolation member 15 all contact the well pipe wall, forming a first sealing section 6 between the first isolation member 12 and the second isolation member 14, and a second sealing section 7 between the second isolation member 14 and the third isolation member 15. The normally closed switch 16 is controlled by the pressure difference. When the switch 16 is opened, the second sealing section 7 is connected to the space below the isolation piston 1, and when the switch 16 is closed, the second sealing section 7 is not connected to the space below the isolation piston 1. Through the reciprocating movement of the isolation piston 1 in the well pipe, the cleaning energy can be concentrated on the well wall where the isolation piston 1 is located. In addition, when the switch 16 is in the open state, only the liquid on the side of the third isolation member 15 away from the second isolation member 14 is allowed to flow between the third isolation member 15 and the second isolation member 14. That is to say, the switch element 16 is a one-way switch. When the switch element 16 is opened, only the liquid below the third sealing element 15 flows upward.
[0026] In this embodiment, the switch member 16 is a baffle rotatably mounted on the third sealing member 15. In the absence of a pressure difference, the baffle closes the internal passage of the third sealing member 15. In the presence of a pressure difference and when the pressure below the third sealing member 15 is greater than the pressure above, the baffle can rotate under the pressure and open the internal passage of the third sealing member 15, and allow the liquid below the third sealing member 15 to flow upward under the pressure difference. In other embodiments, the switch member 16 can also be a pressure valve disposed in the internal passage of the third sealing member 15, which also needs to meet the following requirements: in the open state, only the liquid below the third sealing member 15 is allowed to flow upward.
[0027] In a further configuration, the first packing member 12, the second packing member 14 and the third packing member 15 are all made of rubber sealing rings. The rubber sealing rings have certain elasticity, are easy to install, have good sealing performance, and can better fit the well wall.
[0028] In a further configuration, along the first direction, the spacing between the first packing member 12 and the second packing member 14 and the spacing between the second packing member 14 and the third packing member 15 are both in the range of 2 to 4 meters. That is, the length of the first sealing section 6 and the second sealing section 7 formed by the packing members is in the range of 2 to 4 meters. The sealing length of the sealing section is positively correlated with the energy transfer of the water hammer effect in the piston well washing process, and the effect is more suitable when the sealing section length is controlled at 2 to 4 meters.
[0029] The present application also discloses a hydrogeological well formation and segmented well washing device. Figure 3 To Attachment Figure 5The well washing device comprises a mud pump 3, a drill pipe 8, a connecting pipe 2, a winch (not shown) and a sealing piston 1 of any of the above-mentioned embodiments. The drill pipe 8 is hollow and through-set, one end of the connecting pipe 2 is connected to the mud pump 3, and the other end is connected to the drill pipe 8. The end of the drill pipe 8 away from the connecting pipe 2 is connected to the first sealing member 12, and the winch is used to drive the sealing piston 1 to move along the first direction. The flushing liquid with dispersant can be pumped into the interior of the sealing piston 1 through the mud pump 3, and the flushing liquid can enter the first sealing section 6 and the second sealing section 7 from the opening 18 of the mixing pipe 13 and the lower opening of the second sealing member 14 respectively, so as to replace the mud during the cleaning process.
[0030] In a further configuration, the well washing device further includes a hollow through-connecting head 11, which is connected between the drill pipe 8 and the first packing member 12 to facilitate the flow of the flushing fluid. One end of the connecting head 11 is fixedly connected to the first packing member 12, and the other end is detachably connected to the drill pipe 8. The detachable connection between the connecting head 11 and the drill pipe 8 facilitates the disassembly and maintenance of the packing piston 1.
[0031] The present application also discloses a method for washing a well using the hydrogeological well-forming segmented washing device, the method comprising the following steps: S1: Connect the mud pump 3, the connecting pipe 2, the drill pipe 8, the connecting head 11 and the isolation piston 1 in sequence and ensure internal communication; S2: lowering the sealing piston 1 to the cleaning target section in the filter tube 4 in the well with the first sealing member 12 located above the third sealing member 15, the first sealing member 12, the second sealing member 14 and the third sealing member 15 all contact with the inner wall of the filter tube 4 and seal the filter tube 4, forming a first sealing section 6 between the first sealing member 12 and the second sealing member 14, and forming a second sealing section 7 between the second sealing member 14 and the third sealing member 15; S3: Mud pump 3 injects flushing liquid containing dispersant at natural pressure, and leaves it to soak to soften mud skin and filter layer blockage. During the static process, mud pump 3 inputs pulse pressure to enhance penetration; S4: Let it soak for 2-4 hours; S5: The winch drives the isolation piston 1 to move downward, and the pressure in the space below the isolation piston 1 increases, so that the switch 16 opens upward, and the mud pump 3 repeatedly pumps, and the pressure in the space below the isolation piston 1 is greater than the pressure in the space above the isolation piston 1. The water in the space below the isolation piston 1 flows toward the formation through the filter tube 4, and part of the water flows toward the aquifer in the formation, and the other part flows upward along the gap 5 between the filter tube 4 and the formation, and carries mud and fine sand particles through the filter tube 4 to flow into the space above the isolation piston 1, so that the fine sand particles are discharged to the ground along with the return fluid; S6: The hoist drives the isolation piston 1 to move upward, and the pressure in the space below the isolation piston 1 decreases, so that the switch 16 is closed. At this time, the pressure in the space below the isolation piston 1 is less than the pressure of the aquifer in the formation and the pressure in the first sealing section 6 and the second sealing section 7. The water in the first sealing section 6 and the second sealing section 7 flows through the filter tube 4 to the formation and flows downward, and then flows into the space below the isolation piston through the filter tube 4. The water in the aquifer also flows into the space below the isolation piston through the filter tube 4. S7: repeat steps S5-S6 to complete the cleaning of the target segment; S8: The isolation piston of the winch moves to other cleaning target sections in the filter tube 4, and steps S5 to S6 are repeated until all cleaning target sections in the filter tube 4 are cleaned.
[0032] In step S3, the mud pump 3 inputs a pulse pressure with a pressure range of 1.0-2.0 MPa and a frequency range of 0.1-0.2 Hz to enhance the penetration effect.
[0033] In step S5, the suction pressure range of the mud pump 3 is -0.2 to -0.3 MPa, and the return fluid discharged to the ground is separated into flushing fluid through sedimentation, which is not only environmentally friendly but also resource-saving.
[0034] In step S5 to step S6, the reciprocating stroke of the isolation piston is no more than 6 m.
[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A sealing piston, characterized in that: The invention comprises a first sealing member (12), a mixing tube (13), a second sealing member (14), a connecting rod (17) and a third sealing member (15) which are fixedly connected in sequence along a first direction; the first sealing member (12), the mixing tube (13), the second sealing member (14) and the third sealing member (15) are all hollow and through in the first direction; an opening (18) which is in communication with the interior is formed through a side wall of the mixing tube (13); a normally closed switch member (16) is mounted on the third sealing member (15); the switch member (16) is used to open and close the interior space of the third sealing member (15) along the first direction; the switch member (16) is controlled to open and close by a pressure difference at both sides; Wherein, when the switch member (16) is in the open state, only the liquid on the side of the third sealing member (15) away from the second sealing member (14) is allowed to flow between the third sealing member (15) and the second sealing member (14).
2. The isolation piston according to claim 1, characterized in that: The first sealing member (12), the second sealing member (14) and the third sealing member (15) are rubber sealing rings.
3. The isolation piston according to claim 1, characterized in that: Along the first direction, the distance between the first sealing member (12) and the second sealing member (14) and the distance between the second sealing member (14) and the third sealing member (15) are both in the range of 2 to 4 m.
4. A hydrogeological well-forming and segmented well-washing device, characterized in that: The invention comprises a mud pump (3), a drill pipe (8), a connecting pipe (2), a winch and a sealing piston (1) according to any one of claims 1 to 3, wherein the drill pipe (8) is hollow and through-going, one end of the connecting pipe (2) is connected to the mud pump (3), and the other end is connected to the drill pipe (8), one end of the drill pipe (8) away from the connecting pipe (2) is connected to the first sealing member (12), and the winch is used to drive the sealing piston (1) to move along a first direction.
5. The hydrogeological well formation and staged well washing device according to claim 4 is characterized in that: The well washing device further comprises a connecting head (11) which is arranged hollow and through, the connecting head (11) being connected between the drill pipe (8) and the first sealing member (12), one end of the connecting head (11) being fixedly connected to the first sealing member (12), and the other end of the connecting head (11) being detachably connected to the drill pipe (8).
6. A method for washing a well using the hydrogeological well-forming and segmented washing device as claimed in claim 4 or 5, characterized in that: The steps include: S1: Connect the mud pump (3), the connecting pipe (2), the drill pipe (8), the connecting head (11) and the isolation piston (1) in sequence and ensure internal communication; S2: lowering the sealing piston (1) into the cleaning target section of the filter tube (4) in the well with the first sealing member (12) located above the third sealing member (15); the first sealing member (12), the second sealing member (14) and the third sealing member (15) all come into contact with the inner wall of the filter tube (4) and seal the filter tube (4); a first sealing section (6) is formed between the first sealing member (12) and the second sealing member (14); and a second sealing section (7) is formed between the second sealing member (14) and the third sealing member (15); S3: The mud pump (3) injects a flushing liquid containing a dispersant at natural pressure, and allows the liquid to soak to soften the mud skin and filter layer blockages. During the standing process, the mud pump (3) inputs a pulse pressure to enhance penetration; S4: Let it soak for 2-4 hours; S5: The winch drives the isolation piston (1) to move downward, and the pressure in the space below the isolation piston (1) increases, so that the switch member (16) opens upward, and the mud pump (3) repeatedly pumps, and the pressure in the space below the isolation piston (1) is greater than the pressure in the space above the isolation piston (1). The water in the space below the isolation piston (1) flows into the formation through the filter tube (4), and a part of the water flows to the aquifer in the formation, and the other part flows upward along the gap (5) between the filter tube (4) and the formation, and carries mud and fine sand particles through the filter tube (4) to flow into the space above the isolation piston (1), so that the fine sand particles are discharged to the ground along with the return fluid; S6: The winch drives the isolation piston (1) to move upward, and the pressure in the space below the isolation piston (1) decreases, thereby closing the switch member (16). At this time, the pressure in the space below the isolation piston (1) is lower than the pressure of the aquifer in the formation and the pressure in the first sealing section (6) and the second sealing section (7). The water in the first sealing section (6) and the second sealing section (7) flows through the filter tube (4) into the formation and flows downward, and then flows into the space below the isolation piston (1) through the filter tube (4). The water in the aquifer also flows into the space below the isolation piston (1) through the filter tube (4); S7: repeat steps S5-S6 to complete the cleaning of the target segment; S8: The isolation piston (1) of the winch moves to other cleaning target sections in the filter tube (4), and steps S5 to S6 are repeated until all cleaning target sections in the filter tube (4) are cleaned.
7. The well washing method according to claim 6, characterized in that: In step S3, the mud pump (3) inputs a pulse pressure with a pressure range of 1.0-2.0 MPa and a frequency range of 0.1-0.2 Hz.
8. The well washing method according to claim 6, characterized in that: In step S5, the suction pressure range of the mud pump (3) is -0.2 to -0.3 MPa.
9. The well washing method according to claim 6, characterized in that: In step S5, the flowback liquid that flows back to the ground is precipitated to separate the flushing liquid.
10. The well washing method according to claim 6, characterized in that: In step S5 to step S6, the reciprocating stroke of the isolation piston (1) is no more than 6 m.