Anti-jamming device for water injection well testing instrument

Abstract

The invention discloses an anti-jamming device for a water injection well test instrument. The device comprises an outer shell, a guide cone is arranged at the bottom of the outer shell, a scraper and a guide groove are arranged on the outer wall of the outer shell, an outer shell body bayonet groove and a pin withdrawal groove are arranged on the upper part of the inner cavity of the outer shell, a check valve is arranged in the lower inner cavity of the outer shell, and a liquid hole is arranged in the guide cone, the outer shell is connected to a disconnector through the outer shell body bayonet groove; the disconnector is provided with a connection cap and a quick connector, a lifting bayonet is arranged in the connector bayonet groove at the lower part of the quick connector, and the disconnector can be clamped in the outer shell body bayonet groove of the outer shell by the lifting bayonet, and when the disconnector is hit and slides down, it can be clamped in the pin withdrawal groove by the lifting bayonet; the upper part of the quick connector is suspended in the connection cap and connected to the lower part of the test instrument through the connection cap and the downhole steel wire. Since the use of the invention can be carried out synchronously with the test work of the water injection well, the workload and production cost are reduced, and the water injection time rate of the water injection well is improved.

Description

Technical Field

[0001] The invention relates to an auxiliary downhole tool for a water injection well testing instrument in the petroleum industry, in particular to an anti-jamming device for the water injection well testing instrument. Background Art

[0002] In the process of oil development, in order to supplement the energy of underground reservoirs and improve the recovery rate of crude oil, it is necessary to inject water into the formation through water injection wells, inject water into the oil reservoir through water injection wells, maintain or restore the oil layer pressure, and make the oil reservoir have a stronger driving force to increase the production speed and recovery rate of the oil reservoir. In the dynamic management of oil field production, it is necessary to timely lower instruments to test the downhole working conditions of water injection wells in order to adjust the production process parameters.

[0003] Since the injected water contains a variety of chemical ions, crude oil, impurities and microorganisms, the inner wall of the water injection pipe is prone to scale and adhesion, which will reduce the pipe diameter or even block it. In traditional downhole testing, there will be phenomena that hinder the test operation. When the test instrument is stuck when it is lowered into the well, the operation team can only repair the well, remove all the oil pipes and supporting equipment in the well, and remove the blockage from the ground; then lower all the oil pipes and supporting equipment in the well to resume normal production. The operation takes a long time, occupies a lot of equipment, and is expensive. Traditional downhole testing not only generates a large amount of well repair operation costs, but also affects normal water injection production.

[0004] In order to solve the problem of the test instrument being stuck when going down the well, the conventional practice is to clear the well before testing. Currently, there are two main methods for clearing the well:

[0005] The first is to use conventional well-drilling tools to clear the well: conventional well-drilling tools are generally weighted columns with radial scrapers pushed by springs on their outer walls. The scrapers on the tools scrape off the scale on the well wall during the downward process by using the downward impact force of the well-drilling tool's own weight. Due to the large cross-sectional area of ​​the scraper and the force direction of the scraper being perpendicular to the scraper, the resistance is large and it is easy to encounter obstructions and jams. At the same time, if a large-diameter wire rope is used, it is impossible to achieve closed well-drilling. Wells with large overflow and obstructions cannot be cleared. The success rate of well-drilling is about 30%, which is low.

[0006] The second method is to use electric well-drilling tools to clear the well: after the electric well-drilling drill bit is lowered to the predetermined position through the cable, it is positioned at the interface where it encounters resistance, and the electric well-drilling tool is fixed on the inner wall of the oil pipe. After power is turned on, the drill bit in the electric well-drilling tool is driven to rotate to drill and scrape the stubborn dirt on the wall of the oil pipe. However, due to the influence of space and the limitations of cables, voltage and current, the motor used in the electric well-drilling tool has a small diameter, low speed and power, and can only remove relatively soft oil or polymer in the well. During the use of the electric well-drilling tool, the tool has a high failure rate, high maintenance and repair costs, and is prone to leakage, which poses a safety hazard.

[0007] However, even for water injection wells that have been dredged by the above-mentioned well-drilling tools, the test instrument often gets stuck during water well testing, which can lead to unsuccessful tests and waste manpower and material resources. In severe cases, the test instrument may get stuck in the well, causing the water injection well to be unable to produce normally and requiring well repair, which not only seriously affects production but also causes huge well repair expenses.

[0008] In order to solve the above problems, the on-site technicians have also made many innovations. After searching, there are currently the following related patent technologies: a segmented water injection well test well pass, patent application number: 201410109193.4, the device includes a main body, annular steps, a cone guide head, the main body is cylindrical, with a rope cap at the upper end, annular steps on the outer wall of the main body, and a cone guide head at the lower end of the main body. Under the action of falling by its own gravity and scraping by multi-stage steel segmented annular steps, it is used to specifically remove the scale and adhesion in the water injection pipe column with uniform thickness but small and strong adhesion.

[0009] However, the following defects still exist: the device uses a winch or manual operation to lift and lower the well clearing device back and forth, and uses the tool's own gravity inertia and the scraping effect of the annular steps to remove scale and adhesions; when the gap between the scraper and the well wall is large, it cannot effectively scrape and clear the well; when the gap between the scraper and the well wall is small, it is very easy to get stuck in the well, resulting in the inability of the water injection well to produce normally, requiring well repair, which not only seriously affects production, but also causes huge well repair expenses; it cannot be carried out simultaneously with the water injection well test, and the water injection well can only be cleared separately, and the test instrument is still stuck after clearing the well; clearing the well takes a long time, which not only increases the workload and cost, but also affects the water injection rate.

[0010] A brush-type water injection well test well dredge, patent application number 201410109192.X, the device includes a rope cap, a main body, a wire spike and a conical guide head; the upper end of the main body is a rope cap, the steel wire spike is installed on the cylindrical outer wall of the main body, and the end of the main body has a conical guide head. Eight rows of evenly distributed steel wire spikes are integrated on the cylindrical outer wall of the main body, the main body has a coaxial cylindrical internal cavity and a cylindrical tightening inner plug, and a steel wire hole is opened between the outer wall of the main body and the inner wall of the cavity, the outer end of the steel wire spike passes through the steel wire hole, and the inner end of the steel wire spike is pressed and fixed in the internal cavity with a cylindrical tightening inner plug. The steel wire spike structure is integrated on the outer wall of the steel main body, relying on the tool's own gravity and the scraping effect of the steel wire spike to remove scale and adhesion on the inner wall of the water injection pipe column, and the brush-type structure is used to effectively clean specific scale and adhesion in the water injection pipe column, and the well wall scale is used with a bonding strength within a certain range.

[0011] However, the following defects still exist: when the tool is lowered into the well, the well test winch is used to lower the tool along the inside of the water injection string of the water injection well, and the winch is controlled to keep the tool lowered at a uniform speed. Under normal circumstances, a one-time lowering can remove scale and adhesions to achieve the purpose of well clearing; but in the well section with serious scale and adhesions, the lowering speed of the tool will be significantly slowed down or even stopped. At this time, the device needs to lift and lower the tool by operating the winch or manual operation, and the tool can only be completed by its own gravity inertia. When the interval between the steel wire spur and the well wall is large, it cannot effectively scrape and clear the well; when the interval between the steel wire spur and the well wall is small, it is very easy to get stuck in the well, resulting in the inability of the water injection well to produce normally, requiring well repair, which not only seriously affects production, but also causes huge well repair expenses; it cannot be carried out simultaneously with the water injection well test work, and the water injection well can only be cleared separately, and the test instrument is still blocked after the well is cleared; the well clearing takes a long time, which increases the workload and cost, and affects the water injection time rate.

[0012] A double-helix water well descaling device, patent application number 200320111464.7, is a device for descaling water injection wells used in oil fields, comprising a barrel with a tapered end, on which are arranged two groups of descaling sheets arranged in opposite directions, each group of descaling sheets being spirally embedded in the barrel wall, and a spring being arranged inside the barrel, one end of the spring being in contact with the barrel, and the other end of the spring being in contact with the descaling sheet. After the rear end of the descaling device is connected to the weighted rod, it is placed in the water injection well. The descaling sheet extends out of the cylinder under the action of the spring. The descaling sheet extending out of the cylinder scrapes the scale on the wall of the water injection well. The two sets of descaling sheets in different directions work simultaneously to completely remove the scale on the well wall. When encountering thick scale, the descaling sheet will be compressed into the cylinder, thus avoiding damage to the descaling sheet. During operation, the gravity rod needs to be lifted several times to make the descaling sheet scrape the scale several times to remove all the scale. The descaling sheet with a U-shaped cross section can make the removed scale flow along the U-shaped groove together with the water flow, avoiding the problem that the descaling device cannot work due to too much resistance. It has the advantages of simple structure, safe operation and good descaling effect.

[0013] However, the following defects still exist: the double-helix water well cleaner uses a weighted rod installed at the rear end of the cleaner to remove scale by gravity and external force. A spring is provided, one end of which contacts the cylinder, and the other end of which contacts the descaling sheet. The descaling sheet is controlled to extend and retract by the elastic force of the spring to remove scale. However, due to the complex scaling conditions in the well, if the spring elastic force is small, the descaling effect cannot be achieved. If the spring elastic force is large, the cleaner is easily stuck in the water injection well. In severe cases, it can only be unblocked by well repair, which affects the water injection rate and increases a lot of well repair costs. At the same time, the cleaner can only be used for descaling in water injection wells alone, and cannot be used simultaneously with the water injection well testing device.

[0014] In order to avoid the current situation where similar accidents occur to water injection well testing instruments underground and to improve the success rate of water injection well testing and water injection efficiency, it is necessary to develop an anti-jamming device for water injection well testing instruments. Summary of the invention

[0015] The purpose of the present invention is to provide an anti-jamming device for testing instruments in water injection wells, which can remove scale and adhesion on the well wall and solve the problem that the testing instruments in water injection wells are blocked or stuck when they are lowered into the well. At the same time, the device can be lowered into the well together with the testing instrument, and there is no need to clear the well separately. While improving the success rate of the test, the water injection efficiency is improved and the production cost is reduced.

[0016] The technical solution of the present invention is as follows: the anti-jamming device of the water injection well test instrument comprises an outer shell, and a guide cone is arranged at the bottom of the outer shell, wherein: the outer wall of the outer shell is provided with a scraper and a guide groove, the upper part of the inner cavity of the outer shell is provided with an outer shell body bayonet groove and a pin withdrawal groove, the lower inner cavity of the outer shell is provided with a check valve for limiting the return of water flow, and a liquid hole is provided in the guide cone, and the outer shell is connected with the disconnector through the outer shell body bayonet groove; the lifting bayonet is a cotter pin, and a bayonet connection spring is welded at the opening of the lifting bayonet; the pin withdrawal groove is located below the outer shell body bayonet groove and has an inner diameter greater than the inner diameter of the outer shell body bayonet groove; the disconnector is provided with a connecting cap and a quick connector, and a lifting bayonet is arranged in the connector bayonet groove at the lower part of the quick connector, and the disconnector can be clamped in the outer shell body bayonet groove of the outer shell by the lifting bayonet, and when the disconnector is hit and slides down, it can be clamped in the pin withdrawal groove by the lifting bayonet; the upper part of the quick connector is suspended in the connecting cap and connected to the lower part of the test instrument through the connecting cap and the wire rope.

[0017] The connecting cap in the disconnector is formed by butt-jointing two symmetrical cap bodies, each of which is provided with a hanging step, a strong magnet and a hanging ring or a hanging hole. The hanging step is arranged in the lower inner cavity of each cap body, and the strong magnet is installed in the cap body below the hanging ring or the hanging hole. When the hanging steps in the two cap bodies are butt-jointed, they can be loaded into the hanging plate on the upper part of the quick connector.

[0018] The outer wall of the quick connector in the disconnector is divided from top to bottom into a hanging plate, a receiving body and a bottom plate by the hanging groove and the joint bayonet groove, wherein: the outer circle of the hanging plate is smaller than the outer circle of the receiving body and the bottom plate and is consistent with the outer circle of the connecting cap, and the groove height of the hanging groove is greater than the height of the hanging step;

[0019] The receiving body, the chassis and the central hole of the outer shell are clearance-matched, and the lifting and pulling pins can be installed in the joint pin grooves.

[0020] The lifting and pulling pin is an open pin, and a pin connecting spring is welded at the opening of the lifting and pulling pin; the pin withdrawal groove is located below the outer shell body pin groove and has an inner diameter larger than the inner diameter of the outer shell body pin groove.

[0021] The inner cavity of the outer shell is divided into three cavities by the valve seat plate and the spring seat. The outer shell latch groove and the pin withdrawal groove are arranged in the upper cavity of the outer shell. The check valve is installed in the middle cavity of the outer shell. The lower cavity of the outer shell is connected with the guide cone.

[0022] The valve seat plate is arranged in the middle of the inner cavity of the outer shell, and the central hole of the valve seat plate is a conical hole with a chamfer at the lower end, and the conical hole cooperates with the sealing ball of the check valve; a water injection recovery opening hole is provided on the plate body of the valve seat plate at the periphery of the conical hole, and a one-way sealing pin is also installed in the water injection recovery opening hole, and the water injection recovery opening hole and the one-way sealing pin constitute a water injection work recovery switch.

[0023] The diameter of the water injection recovery opening hole is small at the top and large at the bottom, which is consistent with the shape of the one-way sealing pin and matches the clearance of the one-way sealing pin; the one-way sealing pin is a cylinder with a small outer diameter at the top and a large outer diameter at the bottom, and the top of the one-way sealing pin is riveted to the top of the water injection recovery opening hole.

[0024] The diameter of the water injection recovery opening hole is small at the top and large at the bottom, which is consistent with the shape of the one-way sealing pin and matches the clearance of the one-way sealing pin; the one-way sealing pin is composed of a pin fixing body and a sealing pin body, the pin fixing body with a small outer diameter is threadedly connected to the sealing pin body with a large outer diameter, and a hanging wing edge with a thickness of 0.8mm-1.1mm is provided on the top of the pin fixing body with a small outer diameter. The hanging wing edge can be a circular edge arranged on the top of the pin fixing body or a strip wing evenly distributed around the top of the pin fixing body.

[0025] The one-flow valve is provided with a sealing ball, a sealing spring and a spring seat. The spring seat is a plate body fixed at the lower part of the inner cavity of the outer shell and provided with a center hole. The lower end of the sealing spring is fixed on the plate outside the center hole of the spring seat. The upper end of the sealing spring is fixed to the sealing ball seat. The sealing ball is installed between the center hole of the valve seat plate and the sealing ball seat.

[0026] The upper part of the outer wall of the outer shell is a spiral scraper and a spiral chip groove. The blade body on one side of the scraper with a cutting edge is a straight wall, and the blade body behind the cutting edge and the bottom of the chip groove are sloped; the spiral angle of the scraper and the chip groove is set between 30 degrees and 50 degrees; the guide groove arranged at the lower part of the outer wall of the outer shell has the opposite spiral direction to the scraper and the chip groove and the same spiral angle; at least two liquid holes are provided in the guide cone at the bottom of the outer wall of the outer shell.

[0027] Compared with the prior art, the remarkable use effects of the present invention are as follows: 1. When lowered into the well together with the testing instrument, it can ensure that the well is unblocked and tested at one time and normal water injection can be achieved; the use of the device is safe and reliable. Since its outer wall is provided with a spiral scraper and a chip removal groove, when encountering obstruction or jamming, the impact force of the backwash well water force can be utilized to drive the device to rotate through the guide groove in the lower outer wall of the outer shell, and the scraper and the chip removal groove are utilized to remove scale and adhesions in the oil pipe string, with good descaling effect and not easy to get stuck.

[0028] 2. Since the use of the present invention can be carried out simultaneously with the testing work of the water injection well, it not only reduces the workload and production costs, but also improves the water injection time rate of the water injection well.

[0029] 3. In order to deal with the jamming phenomenon during the test of the water injection well, the present invention sets two normal water injection guarantees: First, when the device is jammed and cannot be released, the test instrument can be used to hit the disconnector in the present invention downward to make the disconnector fall down, so that the lifting pin is stuck in the pin withdrawal groove, and the connection cap and quick connector in the disconnector are released. The disconnector and the test instrument above can be lifted out of the well, while the outer shell is left in the well. The normal water injection work is restored through the one-way valve and the liquid hole in the outer shell. The outer shell, the one-way valve and the liquid hole are the first guarantee for the present invention to complete the well clearance and testing in one trip down to the well and ensure normal water injection.

[0030] 4. If the above methods cannot unblock the card and the check valve fails to open, remove the test instrument and the disconnector of the present invention together, leave the outer shell in the well, and abandon the use of the failed check valve; increase the water injection pressure in the oil pipe through the ground process, and use the water injection pressure to open the water injection work recovery switch to ensure normal water injection and well washing operations and normal production of the water injection well. The outer shell left in the well can be salvaged to the ground during the next well repair operation. The water injection work recovery switch is the second guarantee of the present invention to ensure the normal production of the water injection well, avoid well repair operations, test the well once, and ensure normal water injection.

[0031] 5. The disconnector in the present invention is easy to use and connect. The connecting cap composed of two cap bodies can be quickly connected to the quick connector through a strong magnet and then attracted. The lifting pin and the pin connecting spring installed in the connector pin groove at the bottom of the quick connector can allow the disconnector to slide down smoothly after being hit. During the falling process of the lifting pin, the pin connecting spring is stretched open and then stuck in the pin withdrawal groove in the outer shell, effectively releasing the disconnector, ensuring that the present invention can successfully stay in the well and protect the completion of normal water injection work of the water injection well when encountering extremely serious obstruction.

[0032] In summary, the present invention is suitable for testing water injection wells in oil fields, can be carried out synchronously with the testing of water injection wells, is not prone to blocking, and significantly improves work efficiency. While improving the success rate of testing, it can also ensure normal water injection of water injection wells in the event of extreme blocking, reducing the cost of well repair operations. It has significant use effects and can produce significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a schematic diagram of downhole connection of the present invention.

[0035] Figure 2 It is a cross-sectional view of the structural schematic diagram of the present invention.

[0036] Figure 3 yes Figure 2 Schematic diagram of the structure of a cap body in the middle connecting cap.

[0037] Figure 4 It is a structural schematic diagram of the quick connector in the present invention.

[0038] Figure 5 It is a structural schematic diagram of the first embodiment of the water injection work recovery switch in the present invention.

[0039] Figure 6 It is a structural schematic diagram of the second embodiment of the water injection work recovery switch in the present invention.

[0040] In the figure: 1-wire rope; 2-connecting cap; 3-quick connector; 4-bayonet connecting spring; 5-bayonet slot of outer shell; 6-pin withdrawal slot; 7-outer shell; 8-valve seat plate; 9-water injection recovery opening hole; 10-sealing ball; 11-sealing ball seat; 12-sealing spring; 13-spring seat; 14-check valve; 15-liquid hole; 16-receiving body; 17-lifting bayonet; 18-scraper; 19-chip withdrawal slot; 20-guide slot; 21-guide cone; 22-lifting ring or lifting hole; 23-strong magnet; 24-hanging step; 25-joint bayonet slot; 26-one-way sealing pin; 27-pin fixing body. DETAILED DESCRIPTION

[0041] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] See also Figure 1 and Figure 2 , an anti-jamming device for a water injection well testing instrument comprises an outer shell 7, a guide cone 21 is arranged at the bottom of the outer shell 7, wherein:

[0045] The outer wall of the outer shell 7 is provided with a scraper 18 and a guide groove 20, the upper part of the inner cavity of the outer shell 7 is provided with an outer shell body latch groove 5 and a pin withdrawal groove 6, the lower inner cavity of the outer shell 7 is provided with a check valve 14 for limiting the return of water flow, and a liquid hole 15 is provided in the guide cone 21, and the outer shell 7 is connected to the disconnector through the outer shell body latch groove 5;

[0046] The lifting and pulling card pin 17 is a split pin, and a card pin connecting spring 4 is welded at the opening of the lifting and pulling card pin 17; the pin withdrawal groove 6 is located below the outer shell card pin groove 5 and has an inner diameter greater than the inner diameter of the outer shell card pin groove 5;

[0047] The disconnector is provided with a connecting cap 2 and a quick connector 3. A lifting pin 17 is installed in the connector pin groove 25 at the lower part of the quick connector 3, and the disconnector can be clamped in the outer shell pin groove 5 of the outer shell 7 by the lifting pin 17. When the disconnector is hit and slides downward, it can be clamped in the pin withdrawal groove 6 by the lifting pin 17. The upper part of the quick connector 3 is suspended in the connecting cap 2 and is connected to the bottom of the testing instrument 28 through the connecting cap 2 and the wire rope 1.

[0048] See also Figure 1 and Figure 2 , the present invention is Figure 1 The lower end of the anti-jamming device 29 is provided with a guide cone 21, and the liquid holes 15 are evenly distributed around the guide cone 21. The outer wall of the outer shell 7 is provided with a scraper 18 and a guide groove 20. When the inner wall of the water injection pipe column connected by the oil pipe 30 is covered with scale and adhesion, which reduces the pipe diameter, water is injected into the well on the ground. The injected water enters the gap between the quick connector 3 and the outer shell 7, and the sealing ball 10 of the check valve 14 is pushed open. Under the action of hydraulic impact, the guide groove 20 can be used to promote the rotation of the device of the present invention, so that the scraper 18 removes the scale and adhesion in the water injection pipe column.

[0049] See also Figure 1 The lifting and pulling card pin 17 is a split pin, and the card pin connection spring 4 is welded at the opening of the lifting and pulling card pin 17; the pin withdrawal groove 6 is located below the outer body card pin groove 5 and has an inner diameter larger than the inner diameter of the outer body card pin groove 5. The outer body 7 is suspended in the disconnector by the lifting and pulling card pin 17. When encountering a jam, the lifting and pulling card pin 17 can be easily pulled out of the outer body card pin groove 5 and slide down by the test instrument 28 above. The present invention can make the lifting and pulling card pin 17 slide down under the pull of the card pin connection spring 4 and enter the pin withdrawal groove 6 under the tension of the card pin connection spring 4 to release the disconnector.

[0050] When there is a jam, the testing instrument 28 can be used to hit the device downward, causing the disconnector in the device to fall down, so that the lifting pin 17 is stuck in the pin withdrawal groove 6, releasing the connecting cap 2 and the quick connector 3, and the disconnector and the testing instrument 28 above can be lifted out of the well, and the normal water injection work can be restored through the one-way valve 14 and the liquid hole 15 in the outer shell 7 retained in the well. The one-way valve 14 and the liquid hole 15 provide the first guarantee for completing the well and testing in one trip down to the well and ensuring normal water injection.

[0051] The present invention is connected to the bottom of the testing instrument 28 by the steel wire rope 1, so as to achieve the cost reduction goal of completing well cleaning and testing in one trip down the well, changing the current situation where testing and well cleaning are carried out and completed separately, reducing the operation procedures and greatly reducing the production cost.

[0052] Based on the above embodiment 1, the present invention also has the following embodiments:

[0053] See also Figure 3The connection cap 2 in the disconnector is formed by two symmetrical cap bodies connected together, each cap body is provided with a hanging step 24, a strong magnet 23 and a hanging ring or hanging hole 22, the hanging step 24 is provided in the lower inner cavity of each cap body, and the strong magnet 23 is installed in the cap body below the hanging ring or hanging hole 22; when the hanging steps 24 in the two cap bodies are connected together, they can be loaded into the hanging plate on the upper part of the quick connector 3. The connection cap 2 is composed of two split cap bodies, each of which is equipped with 4 strong magnets 23, and the upper part is designed with a hanging ring or hanging hole 22. The two symmetrically split cap bodies can be quickly sucked together into one by the strong magnet 23, and quickly combined with the quick connector 3. When opening the connection cap 2, it can be quickly separated using tools such as a flat screwdriver. It improves work efficiency and reduces the labor intensity of workers.

[0054] See also Figure 4 The outer wall of the quick connector 3 in the disconnector is divided from top to bottom into a hanging plate, a receiving body 16 and a chassis by a hanging groove and a connector pin groove 25, wherein: the outer circle of the hanging plate is smaller than the outer circle of the receiving body 16 and the chassis and is consistent with the outer circle of the connecting cap 2, and the groove height of the hanging groove is greater than the height of the hanging step 24; the quick connector 3 can rotate freely in the connecting cap 2.

[0055] The receiving body 16 and the center holes of the chassis and the outer shell 7 are clearance-matched, and the lifting and pulling pins 17 can be installed in the joint pin grooves 25. The outer circle of the hanging plate in the quick connector 3 matches the connecting cap 2, which is beautiful on the one hand, and the connecting cap 2 can be smoothly sunk and disconnected with the quick connector 3 on the other hand; if the height of the receiving body 16 is increased, even if the outer diameter of the connecting cap 2 is larger than the outer diameter of the quick connector 3, it can also be smoothly sunk and disconnected.

[0056] The inner cavity of the outer shell 7 is divided into three cavities by the valve seat plate 8 and the spring seat 13. The outer shell locking pin groove 5 and the withdrawal pin groove 6 are arranged in the upper cavity of the outer shell 7. The check valve 14 is installed in the middle cavity of the outer shell 7. The lower cavity of the outer shell 7 is connected with the guide cone 21.

[0057] The valve seat plate 8 is arranged in the middle of the inner cavity of the outer shell 7. The central hole of the valve seat plate 8 is a conical hole with a chamfer at the lower end. The conical hole cooperates with the sealing ball 10 of the one-way valve 14. A water injection recovery opening hole 9 is arranged on the plate body of the valve seat plate 8 at the periphery of the conical hole. A one-way sealing pin 26 is also installed in the water injection recovery opening hole 9. The water injection recovery opening hole 9 and the one-way sealing pin 26 constitute a water injection work recovery switch. In this embodiment, the valve seat plate 8 is used as the valve cover of the one-way valve 14 and the water injection work recovery switch. When the one-way valve 14 fails to open, the water injection work recovery switch can be opened by the water injection pressure to restore the normal water injection work. The specific working principle is as follows: if the device is stuck and cannot be removed, the test instrument 28 can be used to hit the disconnector downward. When the lifting and pulling pin 17 enters the pin withdrawal groove 6, the disconnector in the device will be separated from the outer shell 7. At this time, the test instrument 28 and the disconnector in the device can be taken out of the well, and the outer shell 7 can be left in the well. If the check valve 14 fails, the water injection work recovery switch can be opened by the water injection pressure to ensure normal water injection and well washing operations and normal production of the water injection well. The outer shell 7 left in the well can be salvaged to the ground during the next well repair operation.

[0058] The water injection work recovery switch has the following two embodiments:

[0059] Embodiment 1 of water injection work recovery switch

[0060] See also Figure 5 The diameter of the water injection recovery opening hole 9 is small at the top and large at the bottom, which is consistent with the shape of the one-way sealing pin 26 and has a clearance fit with the one-way sealing pin 26; the one-way sealing pin 26 is a cylinder with a small outer diameter at the top and a large outer diameter at the bottom, and the top of the one-way sealing pin 26 is riveted to the top of the water injection recovery opening hole 9.

[0061] Embodiment 2 of the water injection work recovery switch

[0062] See also Figure 6 The aperture of the water injection recovery opening hole 9 is small at the top and large at the bottom, which is consistent with the shape of the one-way sealing pin 26 and has a clearance fit with the one-way sealing pin 26; the one-way sealing pin 26 is composed of a pin fixing body 27 and a sealing pin body, the pin fixing body 27 with a small outer diameter is threadedly connected to the sealing pin body with a large outer diameter, and a hanging wing edge with a thickness of 0.8mm-1.1mm is provided on the top of the pin fixing body 27 with a small outer diameter, and the hanging wing edge can be a circular edge set on the top of the pin fixing body 27 or a strip wing evenly distributed around the top of the pin fixing body 27. The water injection recovery opening hole 9 is closed when the device is working normally, and only when the device encounters resistance and the one-flow valve 14 fails, it is opened by the water injection pressure, which serves as a second guarantee for maintaining normal water injection after the present invention is blocked.

[0063] The one-way valve 14 is provided with a sealing ball 10, a sealing spring 12 and a spring seat 13. The spring seat 13 is a plate body fixed to the lower part of the inner cavity of the outer shell 7 and provided with a center hole. The lower end of the sealing spring 12 is fixed on the plate outside the center hole of the spring seat 13. The upper end of the sealing spring 12 is fixed with a sealing ball seat 11. The sealing ball 10 is installed between the center hole of the valve seat plate 8 and the sealing ball seat 11. The sealing ball 10 is supported by the sealing ball seat 11, and always keeps running coaxially with the hole up and down. The working surface of the valve seat plate 8 in contact with the sealing ball 10 is provided with a chamfer that matches the spherical surface of the sealing ball 10, which can play a better sealing role. In the process of going down the well, the presence of the one-way valve 14 can prevent the well fluid from entering the valve and reduce the resistance of going down the well. When the device encounters resistance or jamming, the test instrument 28 can be used to hit the disconnector downward. When the lifting and pulling pin 17 enters the pin withdrawal groove 6, the outer shell 7 in the device will be separated from the upper disconnector. At this time, the test instrument 28 and the disconnector can be taken out of the well, while the outer shell 7 is left in the well. The check valve 14 can be opened by the water injection pressure to resume the water injection work, ensure the normal water injection and well washing operations, and ensure the normal production of the water injection well. The outer shell 7 left in the well can be salvaged to the ground during the next well repair operation.

[0064] The upper part of the outer wall of the outer shell 7 is a spiral scraper 18 and a spiral chip groove 19. The blade body of the scraper 18 on one side with a cutting edge is a straight wall, and the blade body behind the cutting edge and the bottom of the chip groove 19 are sloped; the spiral angle of the scraper 18 and the chip groove 19 is set between 30 degrees and 50 degrees; the guide groove 20 arranged at the lower part of the outer wall of the outer shell 7 has an opposite spiral direction to the scraper 18 and the chip groove 19 and the same spiral angle; there are at least two liquid holes 15 in the guide cone 21 at the bottom of the outer wall of the outer shell 7.

[0065] The specific use process of the device of the present invention is as follows:

[0066] 1. If Figure 1 As shown, the anti-jamming device 29 in the figure is assembled before use and is suspended below the test instrument 28 through the steel wire rope 1 and the lifting ring or lifting hole 22;

[0067] 2. Downhole testing: Use a well test winch to lower the test instrument 28 and the anti-jamming device 29 along the oil pipe 30 in the water injection well, and keep lowering at a uniform speed.

[0068] 3. When encountering a slight jam, if the adhesion in the wall of the oil pipe 30 is relatively soft, under the action of gravity, the scraper 18 and chip removal groove 19 on the outer wall of the anti-jamming device 29 can be used to remove the adhesion and scale, ensuring a smooth well and test in one go.

[0069] 4. When encountering a more serious jam and the ground determines that it is impossible to continue to lower the anti-jamming device 29, the ground operation is switched to the backwashing process: when the well washing water enters downward from the top of the casing 31 and returns from the bottom of the oil pipe 30, an upward hydraulic impact force and pressure are generated. Under the action of the guide groove 20 and the hydraulic impact force, the anti-jamming device 29 is pushed to rotate rapidly and move upward, and the scraper 18 and the chip removal groove 19 are used to scrape off the scale, adhesions and other blockages in the pipe wall. The scraped scale falls downward through the groove of the chip removal groove 19, and the larger impurities fall to the bottom of the artificial well below.

[0070] 5. When the underground blockage is removed and the impurities and dirt are discharged, the backwash process on the ground can be closed to release the liquid pressure in the well and continue the test operation. If a more serious blockage is encountered again, the same operation method can be used to remove the blockage.

[0071] 6. When serious jamming occurs and the jamming cannot be removed by the above method: the testing instrument 28 can be used to hit the disconnector in the present invention downward to move the receiving body 16 downward. When the lifting and pulling pin 17 is withdrawn from the outer shell body's pin slot 5 under the extension and pulling of the pin connection spring 4 and the lifting and pulling pin 17 bounces into the pin withdrawal slot 6, the receiving body 16 is separated from the outer shell 7. At this time, the testing instrument 28 and the connecting cap 2 and the quick connector 3 in the anti-jamming device 29 can be taken out of the well.

[0072] 7. After the test instrument 28 and the disconnector are taken out of the well, normal water injection is resumed: the injected water enters from the upper part of the outer shell 7 remaining in the well, and the water injection pressure opens the sealing ball 10 downward and continues downward from the one-way valve 14, flows into the oil pipe 30 through the liquid hole 15 and is injected into the formation, completing the normal water injection work.

[0073] 8. Normal water injection operation when the one-way valve 14 fails to open: increase the water injection pressure from the oil pipe 30 through the ground process. Under the action of the water injection pressure, the top of the pin fixing body 27 hanging on the edge of the water injection recovery opening hole 9 is pressed into the water injection recovery opening hole 9, and the one-way sealing pin 26 falls off downward. The injected water enters from the water injection recovery opening hole 9, flows out from the liquid hole 15, and flows into the oil pipe 30 and the formation, ensuring normal water injection of the normal water injection well.

[0074] 9. The outer shell 7 left in the oil pipe 30 can be taken out when well repair is needed, so that the testing instrument and the present invention can be lowered into the well in one trip, completing both the well cleaning operation and the testing work, thus avoiding the well repair operation after the testing instrument or the well cleaning instrument is stuck, which has a significant use effect and can produce good economic benefits.

[0075] The embodiments described above are only typical embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. An anti-jamming device for a water injection well testing instrument, comprising an outer shell (7), a guide cone (21) being arranged at the bottom of the outer shell (7), wherein: The outer wall of the outer shell (7) is provided with a scraper (18) and a guide groove (20); the upper part of the inner cavity of the outer shell (7) is provided with an outer shell body latch groove (5) and a pin withdrawal groove (6); the lower inner cavity of the outer shell (7) is provided with a check valve (14) for limiting the upward flow of water, and a liquid hole (15) is provided in the guide cone (21); the outer shell (7) is connected to the disconnector through the outer shell body latch groove (5); the lifting latch (17) is a split pin, and a latch connection spring (4) is welded at the opening of the lifting latch (17); the pin withdrawal groove (6) is located below the outer shell body latch groove (5) and The inner diameter of the connector is larger than the inner diameter of the outer housing latch groove (5); the disconnector is provided with a connection cap (2) and a quick connector (3); a pull-up latch (17) is installed in the connector latch groove (25) at the lower part of the quick connector (3); and the disconnector can be held in the outer housing latch groove (5) of the outer housing (7) by the pull-up latch (17); when the disconnector is impacted and slides downward, it can be held in the pin withdrawal groove (6) by the pull-up latch (17); the upper part of the quick connector (3) is suspended in the connection cap (2) and connected to the lower part of the test instrument (28) through the connection cap (2) and the wire rope (1).

2. The anti-jamming device for water injection well testing instrument according to claim 1, characterized in that: The connecting cap (2) in the disconnector is formed by butting two symmetrical cap bodies, each cap body being provided with a hanging step (24), a strong magnet (23) and a hanging ring or a hanging hole (22), the hanging step (24) being provided in the lower inner cavity of each cap body, and the strong magnet (23) being installed in the cap body below the hanging ring or the hanging hole (22); when the hanging steps (24) in the two cap bodies are butt-jointed, they can be loaded into the hanging plate on the upper part of the quick connector (3).

3. The anti-jamming device for water injection well testing instrument according to claim 2, characterized in that: The outer wall of the quick connector (3) in the disconnector is divided from top to bottom into a hanging plate, a receiving body (16) and a chassis by a hanging groove and a connector pin groove (25), wherein: the outer circle of the hanging plate is smaller than the outer circle of the receiving body (16) and the chassis and matches the outer circle of the connecting cap (2), and the groove height of the hanging groove is greater than the height of the hanging step (24); the receiving body (16) and the chassis are clearance-fitted with the center hole of the outer shell (7), and the connector pin groove (25) can accommodate a lifting pin (17).

4. The anti-jamming device for water injection well testing instrument according to claim 1, 2 or 3, characterized in that: The inner cavity of the outer shell (7) is divided into three cavities by the valve seat plate (8) and the spring seat (13); the outer shell latch groove (5) and the pin withdrawal groove (6) are arranged in the upper cavity of the outer shell (7); the check valve (14) is installed in the middle cavity of the outer shell (7); and the lower cavity of the outer shell (7) is connected to the guide cone (21).

5. The anti-jamming device for water injection well testing instrument according to claim 4, characterized in that: The valve seat plate (8) is arranged in the middle of the inner cavity of the outer shell (7); the central hole of the valve seat plate (8) is a conical hole with a chamfered lower end, and the conical hole cooperates with the sealing ball (10) of the check valve (14); a water injection recovery opening hole (9) is provided on the plate body of the valve seat plate (8) at the periphery of the conical hole, and a one-way sealing pin (26) is also installed in the water injection recovery opening hole (9); the water injection recovery opening hole (9) and the one-way sealing pin (26) constitute a water injection operation recovery switch.

6. The anti-jamming device for water injection well testing instrument according to claim 5, characterized in that: The diameter of the water injection recovery opening hole (9) is smaller at the top and larger at the bottom, which matches the shape of the one-way sealing pin (26) and has a clearance fit with the one-way sealing pin (26); the one-way sealing pin (26) is a cylinder with a smaller outer diameter at the top and larger at the bottom, and the top of the one-way sealing pin (26) is riveted to the top of the water injection recovery opening hole (9).

7. The anti-jamming device for water injection well testing instrument according to claim 5, characterized in that: The diameter of the water injection recovery opening hole (9) is smaller at the top and larger at the bottom, which is consistent with the shape of the one-way sealing pin (26) and has a clearance fit with the one-way sealing pin (26); the one-way sealing pin (26) is composed of a pin fixing body (27) and a sealing pin body, the pin fixing body (27) with a small outer diameter is threadedly connected to the sealing pin body with a large outer diameter, and a hanging wing edge with a thickness of 0.8mm-1.1mm is provided on the top of the pin fixing body (27) with a small outer diameter, and the hanging wing edge can be a circular edge arranged on the top of the pin fixing body (27) or a strip wing evenly distributed around the top of the pin fixing body (27).

8. The anti-jamming device for water injection well testing instrument according to claim 1, characterized in that: The one-flow valve (14) is provided with a sealing ball (10), a sealing spring (12) and a spring seat (13). The spring seat (13) is a plate body fixed to the lower part of the inner cavity of the outer shell (7) and provided with a center hole. The lower end of the sealing spring (12) is fixed to the plate outside the center hole of the spring seat (13). The upper end of the sealing spring (12) is fixed to the sealing ball seat (11). The sealing ball (10) is installed between the center hole of the valve seat plate (8) and the sealing ball seat (11).

9. The anti-jamming device for water injection well testing instrument according to claim 4, characterized in that: The upper portion of the outer wall of the outer shell (7) is provided with a spiral scraper (18) and a spiral chip groove (19); the blade body of the scraper (18) on one side of which the blade edge is provided is a straight wall, and the blade body behind the blade edge and the bottom of the chip groove (19) are sloped; the spiral angles of the scraper (18) and the chip groove (19) are set between 30 degrees and 50 degrees; the guide groove (20) provided at the lower portion of the outer wall of the outer shell (7) has a spiral direction opposite to that of the scraper (18) and the chip groove (19) and has the same spiral angle; and at least two liquid passage holes (15) are provided in the guide cone (21) at the bottom of the outer wall of the outer shell (7).

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