CN115182717A - Anti-blocking device of water injection well testing instrument - Google Patents

Abstract

The invention discloses an anti-blocking device of a water injection well testing instrument, which comprises an outer shell, wherein the bottom of the outer shell is provided with a guide cone, the outer wall of the outer shell is provided with a scraper and a diversion trench, the upper part of the inner cavity of the outer shell is provided with an outer shell clamping pin trench and a pin withdrawing trench, the inner cavity of the lower part of the outer shell is provided with a check valve, a liquid passing hole is formed in the guide cone, and the outer shell is connected with a disconnecting connector through the outer shell clamping pin trench; the disconnecting device is provided with a connecting cap and a quick connector, a lifting bayonet lock is arranged in a connector bayonet lock groove at the lower part of the quick connector, the disconnecting device can be clamped in an outer shell bayonet lock groove of the outer shell through the lifting bayonet lock, and when the disconnecting device is impacted and slides downwards, the disconnecting device can be clamped in a pin withdrawing groove through the lifting bayonet lock; the upper part of the quick connector is hung in the connecting cap and is connected below the testing instrument through the connecting cap and the well descending steel wire. The invention can be used for synchronously testing the water injection well, thereby reducing the workload and the production cost and improving the water injection time rate of the water injection well.

Description

Anti-jamming device for water injection well testing instruments

technical field

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 a water injection well testing instrument.

Background technique

In the process of oil development, in order to supplement the energy of the underground reservoir and improve the oil recovery rate, it is necessary to inject water into the formation through the water injection well, and inject the water into the oil reservoir through the water injection well to maintain or restore the pressure of the oil layer, so that the oil reservoir has a strong driving force. force to increase the rate and recovery of oil reservoirs. In the dynamic management of oilfield production, it is necessary to run the instrument in time to test the downhole working conditions of the water injection well, so as to adjust the production process parameters.

Because the injected water contains a variety of chemical ions, crude oil, impurities and microorganisms, scale and adhesions are easily formed on the inner wall of the water injection pipe column, which reduces the diameter of the pipe or even blocks it. During the traditional downhole test, the phenomenon of hindering the test operation will occur. When the test instrument is stuck in the well and is stuck, the operation team can only work over the well, take out all the tubing and supporting equipment in the well, and remove the blockage from the ground; then Then run all the tubing and supporting equipment into the well to resume normal production. The operation time is long, the equipment is occupied, and the cost is expensive. Traditional downhole testing not only generates a lot of workover costs, but also affects normal water injection production.

In order to solve the problem of jamming of testing instruments when going down the well, the conventional practice is to conduct well drilling before testing. At present, the commonly used well drilling methods for well drilling operations mainly include the following two:

The first is to use conventional drilling tools for well drilling: conventional drilling tools are generally a weighted cylindrical body with a radial scraper pushed by a spring on its outer wall. Using the downward impact force of the self-weight of the drilling tool, the scraper on the tool scrapes the scale on the well wall during the downward process. Due to the large cross-sectional area of the scraper, and the force direction of the scraper is perpendicular to the scraper, the resistance is large, and it is easy to encounter resistance, encounter card. At the same time, if a large-diameter steel wire rope is used, it is impossible to achieve closed well opening, and it is impossible to conduct well opening for blocked wells with large overflow. The success rate of well opening is about 30%, and the success rate of well opening is low.

The second is to use the electric drilling tool to open the well: after the electric drilling bit is lowered to the predetermined position through the cable, position the electric drilling tool at the resistance interface, fix the electric drilling tool on the inner wall of the tubing, and drive the drill bit in the electric drilling tool after powering on. Rotate to drill and scrape stubborn dirt from the tubing walls. However, due to the influence of space and the limitation of cables, voltage and current, the motor selected by the electric drilling tool has a small diameter, low speed and low power, and can only remove the relatively soft oil or polymer in the well. During the use of well tools, the failure rate of the tools is high, the maintenance and repair costs are high, it is easy to leak electricity, and there are potential safety hazards.

However, even for the water injection well that has been opened by the above-mentioned well-opening tool, the test instrument is often blocked during the well test, which may lead to unsuccessful testing, waste of manpower and material resources, and even cause the test instrument to be blocked. In the well, the injection well cannot be produced normally, and workover is required, which not only seriously affects the production, but also causes huge expenses for the workover.

In order to solve the above problems, the on-site technicians have also made many innovations. After searching, there are still the following related patented technologies:

A link-type water injection well testing device, patent application number: 201410109193.4, the device includes a main body, an annular step, a cone guide head, the main body is cylindrical, the upper end is provided with a rope cap, the outer wall of the main body has an annular step, the main body The lower end has a tapered guide head. Under the action of falling under its own gravity and scraping by multi-level steel ring-shaped steps, the water injection pipe column is targeted for removal of scales and adherents with a uniform but small thickness and strong adhesion.

However, the following defects still exist: the device reciprocally lifts and lowers the well runner through a winch or manual operation, and removes scale and adhesions with the help of the tool's own gravity inertia and the scraping action of the annular step; when the scraper and the well wall are intermittently large, the Ineffective scraping and well-passing effect; scraper and wellbore intermittently small, it is easy to get stuck in the well, causing the injection well to fail to produce normally, requiring workover, which not only seriously affects production, but also causes huge cost of workover ; It cannot be carried out simultaneously with the water injection well test, and the water injection well can only be opened independently, and the test instrument is still blocked after the well is opened; it takes a long time to open the well, which not only increases the workload and cost, but also affects the water injection time rate. .

A brush-type water injection well testing device, patent application number 201410109192.X, the device includes a rope cap, a main body, a wire spur and a conical guide head; the upper end of the main body is a rope cap, and the cylindrical outer wall of the main body is installed with a wire spur, and the main body The ends have tapered guides. The cylindrical outer wall of the main body integrates eight rows of evenly distributed steel wire spurs, the main body has a coaxial cylindrical inner 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, and the outer end of the steel spurs penetrates Out of the steel wire hole, the inner end of the steel wire protruding thorn is pressed and fixed with a cylindrical screwing inner plug in the inner cavity of the shape. The steel wire protruding structure is integrated on the outer wall of the steel main body. With the help of the tool's own gravity and the rubbing action of the wire protruding thorn, the scale and adhesions on the inner wall of the water injection pipe string are removed, and the specific scale and adhesion in the water injection pipe string are effectively cleaned by the brush structure. , use the wellbore fouling with bond strength within a certain range.

However, the following defects still exist: when running down the well, use the well test winch to run the tool along the inside of the water injection pipe string of the water injection well, and control the winch to keep the tool running at a constant speed. Under normal circumstances, one-time lowering can remove scale and adhesions to achieve the purpose of opening the well; however, in the well section with serious scales and adhesions, the tool's lowering speed will be significantly slowed down or even stopped. At this time, the device needs to operate the winch or manually. The tool is lifted and lowered in a reciprocating operation, and the drilling operation can be completed with the help of the tool's own gravity and inertia. When the interval between the steel wire spur and the borehole wall is large, the effect of scraping and well penetration cannot be achieved effectively; if the interval between the steel wire spur and the borehole wall is small, it is easy to get stuck in the well, causing the water injection well to fail to produce normally and requiring workover, which has a serious impact on the Production, resulting in huge workover costs; it cannot be carried out simultaneously with the injection well testing, and the injection well can only be opened independently, and the test instrument is still blocked after the well opening; it takes a long time to open the well, not only It increases the workload and cost, and affects the water injection time rate.

A double-spiral water well scale remover, patent application No. 200320111464.7, the device is a device for descaling water injection wells used in oil fields, including a cylinder with a conical end, on which is provided with Two sets of descaling sheets are arranged in opposite directions, each set of descaling sheets is spirally embedded on the cylinder wall, and a spring is arranged inside the cylinder, one end of the spring is in contact with the cylinder, and the other end of the spring is in contact with the descaling sheets are in contact. Connect the rear end of the scale cleaner with the weighting rod and put it into the water injection well. The scale removal sheet protrudes out of the cylinder under the action of the spring. The descaling sheets in different directions can work at the same time to completely remove the scale on the well wall. When thick scale is encountered, the descaling sheet will be compressed into the cylinder, so as to avoid damage to the descaling sheet. Lifting the gravity rod several times causes the scale removal sheet to scrape the scale several times to remove all the scale. The scaler resistance is too large to work. It has the advantages of simple structure, safe operation and good descaling effect.

But there are still the following defects: the double-spiral water well scale remover adopts a weighted rod installed at the rear end of the scale remover to complete the scale removal by pulling up and down with external force; contact, the other end of the spring is in contact with the descaling sheet, and the scaling of the scaling sheet is controlled by the elasticity of the spring to remove the scale; however, due to the complicated situation of scaling in the well, if the spring has a small The elasticity is large, it is easy to jam the scale cleaner in the water injection well, and in severe cases, only the workover operation can be used to release the jam, which not only affects the water injection time rate, but also increases a lot of workover costs. At the same time, the scale remover can only be used for descaling water injection wells alone, and cannot be used simultaneously with the water injection well testing device.

In order to avoid the current situation of similar accidents occurring in the water injection well test instruments in the well, and to improve the water injection well test success rate and water injection efficiency, it is necessary to develop an anti-jamming device for the water injection well test instruments.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an anti-jamming device for water injection well testing instruments, to remove scale and adhesions on the well wall, and to solve the problem that the current water injection well testing instruments are blocked or stuck when going down the well. At the same time, the device can be run into the well together with the testing instrument, and it is not necessary to pass the well separately. While improving the test success rate, the water injection efficiency is improved and the production cost is reduced.

The technical solution of the present invention is:

The anti-jamming device of the water injection well test instrument includes an outer casing, and a guide cone is arranged at the bottom of the outer casing, wherein:

The outer wall of the outer casing is provided with a scraper and a guide groove, the upper part of the inner cavity of the outer casing is provided with an outer casing bayonet groove and a de-pin groove, and the lower inner cavity of the outer casing is equipped with a check valve and a guide cone is provided with a filter. Liquid hole, the outer casing is connected with the disconnector through the outer casing bayonet groove;

The disconnector is provided with a connecting cap and a quick connector, and the connector bayonet slot at the lower part of the quick connector is provided with a pull-up bayonet, and the disconnector can be clamped in the bayonet slot of the outer casing through the pull-up bayonet. When the decoupler is knocked down and falls down, it can be held in the ejection groove by the pull-up bayonet; the upper part of the quick connector is suspended in the connection cap and connected under the test instrument through the connection cap and the downhole wire.

The connecting cap in the disconnector is formed by butt jointing of two symmetrical cap bodies, each cap body is provided with a hanging step, a strong magnet and a hanging ring or a hanging hole, and the hanging step is arranged on the bottom of each cap body. In the lower inner cavity, the strong magnet is installed in the cap body below the hoisting ring or the hoisting hole; when the suspension steps in the two cap bodies are butted together, they can be installed in the suspension plate on the upper part of the quick connector.

The outer wall of the quick joint in the disconnector is divided into a suspension plate, a receiving body and a chassis from top to bottom by the suspension groove and the joint bayonet groove, wherein:

The outer circle of the suspension plate is smaller than the outer circle of the receiving body and the chassis and is consistent with the outer circle of the connecting cap, and the groove height of the suspension groove is greater than the height of the suspension step;

There is a clearance fit between the receiving body and the base plate and the central hole of the outer casing, and a pull-up latch can be installed in the joint latch groove.

The lift bayonet is a split pin, and a bayonet connection spring is welded at the opening of the lift bayonet; the pin withdrawal groove is located below the bayonet groove of the outer casing and has an inner diameter larger than that of the bayonet groove of the outer casing.

The inner cavity of the outer shell is divided into three cavities by the valve seat plate and the spring seat, the outer shell bayonet groove and the pin-out groove are arranged in the upper cavity of the outer shell, and the check valve is installed in the middle cavity of the outer shell. In the cavity, the lower cavity of the outer casing communicates with the guide cone.

The valve seat plate is arranged in the middle of the inner cavity of the outer casing, and the center hole of the valve seat plate is a conical hole with a chamfer at the lower end, and the conical hole is matched with the sealing ball of the one-flow valve; A water injection recovery opening hole is provided on the plate body of the valve seat plate around the hole, and a one-way sealing pin is also installed in the water injection recovery opening hole. The water injection recovery opening hole and the one-way sealing pin constitute a water injection recovery switch.

The aperture of the water injection recovery opening hole is small in the upper part and large in the lower part, which is consistent with the shape of the one-way sealing pin and fits with the one-way sealing pin; The top of the opening hole is riveted with the described water injection recovery.

The aperture of the water injection recovery opening hole is small in the upper part and large in the lower part, which is consistent with the shape of the one-way sealing pin and fits with the one-way sealing pin; the one-way sealing pin is composed of a pin fixing body and a sealing pin body. It is threadedly connected with the sealing pin body with a large outer diameter, and a suspension wing with a thickness of 0.8mm-1.1mm is arranged on the top of the pin fixing body with a small outer diameter. The suspension wing can be a circular edge arranged on the top of the pin fixing body or It is a strip of wings evenly distributed around the top of the pin holder.

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 casing and provided with a central hole, and the lower end of the sealing spring is fixed on the plate outside the central hole of the spring seat, The upper end of the sealing spring is fixed with a sealing ball seat, and the sealing ball is installed between the central hole of the valve seat plate and the sealing ball seat.

The upper part of the outer wall of the outer casing is a helical scraper and a helical chip removal groove. The blade body on the side of the scraper with the edge is a straight wall, and the blade body at the rear of the blade edge and the groove bottom of the chip removal groove. It is slope-shaped; the helical angle of scraper and chip removal groove is set between 30 degrees and 50 degrees; The same; there are at least two liquid passage holes in the guide cone at the bottom of the outer wall of the outer casing.

Compared with the prior art, the remarkable use effect of the present invention is as follows:

1. Going down the well with the testing instrument can ensure that the well opening and testing can be completed at one time and can realize normal water injection; the device is safe and reliable to use, because its outer wall is provided with a spiral scraper and a chip removal groove, it can be used when it encounters obstacles or jams. Using the impact force of the backwashing well hydraulic force, the device is driven to rotate through the diversion groove in the lower outer wall of the outer casing, and the scraper and chip removal groove are used to remove the scale and adhesion in the tubing string. The scale removal effect is good, and it is not easy to get stuck .

2. Since the use of the present invention can be performed simultaneously 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.

3. In order to deal with the jam phenomenon during the water injection well test, the present invention provides two normal water injection guarantees: one is that when the device is jammed and cannot be removed, the test instrument can be used to hit the disconnector in the present invention downward. , drop the disconnector, let the lift bayonet be stuck in the ejection groove, and release the connecting cap and quick connector in the disconnector, so that the disconnector and the test instrument above can be lifted out of the well, leaving the outer casing. downhole. The normal water injection work is resumed through the one-flow valve and the liquid-passing hole in the outer casing. The outer casing, the one-flow valve and the liquid-passing hole are the first guarantees for the present invention to complete the well-passing and testing in one trip and ensure normal water injection.

4. If the above method can not release the card, and the one-flow valve fails to open at the same time: take out the test instrument and the disconnector in the present invention together, leave the outer casing in the well, and give up the use of failure. The water injection pressure is increased in the oil pipe through the surface process, and the water injection work recovery switch is turned on by the water injection pressure, so as to ensure the normal water injection and well cleaning operations, and ensure the normal production of the water injection well. The outer casing left in the well can be salvaged to the surface during the next workover operation. The water injection work resumption switch is the second guarantee of the present invention to ensure the normal production of the water injection well, avoid the well workover operation, test the well at one time, and ensure the normal water injection setting.

5. The disconnector in the present invention is easy to use and connect, and the connecting cap composed of two cap bodies can be quickly connected with the quick connector through a strong magnet and then pulled in; The connection spring with the bayonet can make the disconnector slide down after being hit smoothly. During the falling process of the pull-up bayonet, the bayonet connection spring is stretched and then stuck in the ejection groove in the outer casing, effectively releasing The disconnector ensures that the present invention successfully stays in the well and protects the completion of the normal water injection work of the water injection well when the present invention encounters extremely serious jamming.

To sum up, the present invention is suitable for oilfield water injection well testing work, can be performed simultaneously with water injection well testing work, is not easily blocked, and significantly improves work efficiency. While improving the test success rate, it can also ensure the normal water injection of the water injection well in the event of extreme jamming, and reduce the cost of workover operations. It has significant use effect and can produce significant economic and social benefits.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the attached image:

FIG. 1 is a schematic diagram of the downhole connection of the present invention.

FIG. 2 is a cross-sectional view of a schematic structural diagram of the present invention.

FIG. 3 is a schematic structural diagram of a cap body in the connecting cap in FIG. 2 .

Figure 4 is a schematic structural diagram of a quick connector in the present invention.

FIG. 5 is a schematic view of the structure of the one-way sealing pin in the present invention.

FIG. 6 is a schematic diagram of the structure of the water injection work recovery switch 1 in the present invention.

In the figure: 1- steel wire rope; 2- connecting cap; 3- quick connector; 4- bayonet spring; 5- bayonet groove of outer shell; Work recovery opening hole; 10-sealing ball; 11-sealing ball seat; 12-spring; 13-spring seat; 14-check valve; 15-liquid hole; 16-bearing body; 17-pulling bayonet; 18 - scraper; 19 - chip removal groove; 20 - guide groove; 21 - guide cone; 22 - lifting ring or lifting hole; 23 - strong magnet; 24 - hanging step; 25 - joint bayonet groove; 26 - one-way seal pin; 27-pin fixing body.

Detailed ways

The accompanying drawings are only used for reference and description, and are not used to limit the protection scope of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention. In addition, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

Referring to Figures 1 and 2, the anti-jamming device for a water injection well test instrument includes an outer casing 7, and a guide cone 21 is provided at the bottom of the outer casing 7, wherein:

The outer wall of the outer casing 7 is provided with a scraper 8 and a diversion groove 20, the upper part of the inner cavity of the outer casing 7 is provided with an outer casing bayonet groove 5 and a de-pin groove 6, and the lower inner cavity of the outer casing 7 is provided with a check valve 14 and A liquid passage hole 15 is provided in the guide cone 21, and the outer casing 7 is connected to the disconnector through the outer casing bayonet groove 5;

The disconnector is provided with a connecting cap 2 and a quick connector 3. The connector bayonet groove 25 at the lower part of the quick connector 3 is provided with a pull-up bayonet 17, and the lift-off bayonet 17 can be used to hold the disconnector on the outer casing 7. In the bayonet groove 5 of the outer casing, when the decoupler is knocked down and slides down, it can be held in the withdrawal groove 6 by the pulling bayonet 17; the upper part of the quick connector 3 is suspended in the connecting cap 2 and connected by The cap 2 and the downhole wire 1 are attached below the testing instrument 28 .

Referring to FIGS. 1 and 2 , a guide cone 21 is provided at the lower end of the anti-jamming device 29 in the present invention, and the liquid holes 15 are evenly distributed around the guide cone 21 , and the outer wall of the outer casing 7 is provided with a scraper 18 and the diversion groove 20, when the inner wall of the water injection pipe string connected by the oil pipe 30 is formed with scale and adhesions to reduce the pipe diameter, water is injected into the well on the ground, and the injected water is injected from the gap between the quick connector 3 and the outer casing 7. Entering in the middle, the sealing ball 10 of the one-flow valve 14 is pushed open, and the guide groove 20 can be used to push the device of the present invention to rotate under the action of hydraulic impact, so that the scraper 18 can remove the scale and adhesion in the water injection pipe string. When there is jamming, the test instrument 28 can be used to hit the device downwards, so that the disconnector in the device falls down, so that the pulling pin 17 is stuck in the ejection groove 6, and the connecting cap 2 and the quick connector are released. 3. The disconnector and the test instrument 28 above can be pulled out of the well, and the normal water injection work can be resumed through the check valve 14 and the liquid passage hole 15 in the outer casing 7 that remain in the well. The check valve 14 and the liquid flow hole 15 It provides the first guarantee for the completion of drilling and testing in one trip and ensuring normal water injection.

In the present invention, the downhole steel wire 1 is connected below the testing instrument 28, so that the cost reduction goal of well drilling and testing can be accomplished in one go, changing the current situation that testing and well drilling are carried out and completed separately, and reducing operation procedures. Significantly reduces production costs.

On the basis of the above-mentioned Embodiment 1, the present invention also has the following embodiments:

Referring to FIG. 3, the connecting cap 2 in the disconnector is formed by butting two symmetrical cap bodies, each cap body is provided with a suspension step 24, a strong magnet 23 and a suspension ring or a suspension hole 22, the suspension The step 24 is arranged in the lower inner cavity of each cap body, and the strong magnet 23 is installed in the cap body under the lifting ring or the lifting hole 22; when the suspension steps 24 in the two cap bodies are butted, the quick connector 3 can be installed. Upper suspension plate. The connecting cap 2 is composed of two split cap bodies, which are respectively installed with four strong magnets 23, and the upper part is designed with a hanging ring or a hanging hole 22. Through the strong magnet 23, the two symmetrically divided cap bodies can be quickly sucked and closed into a One piece, quickly combined with quick connector 3. When the connecting cap 2 is opened, it can be quickly separated with a tool such as a flat-blade screwdriver. Improve work efficiency and reduce labor intensity of workers.

Referring to FIG. 4, the outer wall of the quick connector 3 in the disconnector is divided into a suspension plate, a receiving body 16 and a chassis from top to bottom by the suspension groove and the joint bayonet groove 25, wherein:

The outer circle of the suspension 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 suspension groove is greater than the height of the suspension step 24; the quick connector 3 can be freely rotated in the connecting cap 2 .

There is a clearance fit between the receiving body 16 and the bottom plate and the central hole of the outer casing 7 , and the pull-up bayonet 17 can be inserted into the joint bayonet slot 25 . The outer circle of the suspension plate in the quick connector 3 is consistent with that of the connecting cap 2. On the one hand, it is beautiful, and on the other hand, the connecting cap 2 can be smoothly sunk and disconnected with the quick connector 3; if the height of the receiving body 16 is increased, even if the connection is The outer diameter of the cap 2 is larger than the outer diameter of the quick connector 3, and it can also be smoothly descended and disconnected.

Referring to FIG. 1 , the lift bayonet 17 is a split pin, and the bayonet connection spring 4 is welded at the opening of the lift bayonet 17 ; the pin withdrawal groove 6 is located below the bayonet groove 5 of the outer casing and has a larger inner diameter than the casing The inner diameter of the body bayonet groove 5. The outer casing 7 is suspended in the decoupler by the pull-up bayonet 17, and when it encounters a jam, the test instrument 28 above hits the present invention downwards, so that the pull-up bayonet 17 can be pulled by the bayonet connection spring 4. It is convenient to leave the bayonet slot 5 of the outer casing and slide down and enter into the ejection slot 6 under the tension of the bayonet connection spring 4 to release the disconnector.

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 bayonet slot 5 and the pin withdrawal slot 6 are arranged in the upper cavity of the outer shell 7. The check valve 14 It is installed in the middle cavity of the outer casing 7 , and the lower cavity of the outer casing 7 communicates with the guide cone 21 .

The valve seat plate 8 is arranged in the middle of the inner cavity of the outer casing 7, and the central hole of the valve seat plate 8 is a conical hole with a chamfer at the lower end, and the conical hole is matched 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 on the outer periphery of the tapered hole, and a one-way sealing pin 26 is also installed in the water injection recovery opening hole 9. The sealing pin 26 constitutes a water injection operation recovery switch. In this embodiment, the valve seat plate 8 not only serves as the valve cover of the check valve 14, but also serves as the water injection work resumption switch. When the check valve 14 fails and cannot be opened, the water injection work resumption switch can be turned on by the water injection pressure. Return to normal water injection. The specific working principle is as follows:

When the device is blocked and cannot be released, the test instrument 28 can be used to hit the disconnector downwards. When the latch 17 is pulled into the ejection groove 6, the disconnector and the shell of the device can be caused to Body 7 disengages. The test instrument 28 and the decoupler in the device can now be removed from the well, leaving the outer casing 7 in the well. If the check valve 14 fails, the water injection work resumption switch can be turned on by the water injection pressure to ensure normal water injection and well cleaning operations, and to ensure the normal production of the water injection well. The outer casing 7 left in the well can be fished to the surface in the next workover operation.

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

Embodiment 1 of the water injection work recovery switch

Referring to FIG. 5 , the aperture of the water injection recovery opening hole 9 is smaller in the upper part and larger in the lower part, which is in line with the shape of the one-way sealing pin 26 and is in clearance fit with the one-way sealing pin 26; body and the top of the one-way sealing pin 26 is riveted with the top of the water injection recovery opening hole 9 .

Embodiment 2 of the water injection work recovery switch

Referring to FIG. 6 , the aperture of the water injection recovery opening hole 9 is small in the upper part and larger in the lower part, which is in line with the shape of the one-way sealing pin 26 and is in clearance fit with the one-way sealing pin 26; The small outer diameter pin fixing body 27 is threadedly connected with the large outer diameter sealing pin body, and the top of the small outer diameter pin fixing body 27 is provided with a suspension wing with a thickness of 0.8mm-1.1mm, and the suspension wing can be The round edges arranged on the top of the pin fixing body 27 or the strip-shaped wings evenly distributed on the periphery of the top of the pin fixing body 27 . The water injection recovery opening hole 9 is closed when the device is in normal operation. Only when the device encounters resistance and the check valve 14 fails, the water injection pressure is used to open it. As the present invention is blocked and stuck, it can also be maintained. The second guarantee for normal water injection work.

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 at the lower part of the inner cavity of the outer casing 7 and provided with a central hole, and the lower end of the sealing spring 12 is fixed on the spring seat. On the plate outside the central hole of 13 , the upper end of the sealing spring 12 is fixed with the sealing ball seat 11 , and the sealing ball 10 is installed between the central 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 up and down with the hole, and the working surface of the valve seat plate 8 in contact with the sealing ball 10 is provided with a chamfer matched with the spherical surface of the sealing ball 10, which can play a better role. good sealing effect. In the process of going down the device, the existence of the one-flow valve 14 can prevent the well fluid from entering the valve and reduce the resistance of going down. When the pull pin 17 enters the unpin slot 6, the outer casing 7 in the device will be disengaged from the upper disconnector. The test instrument 28 and decoupler can now be removed from the well, leaving the outer housing 7 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 cleaning operations, and ensure the normal production of the water injection well. The outer casing 7 left in the well can be fished to the surface in the next workover operation.

The upper part of the outer wall of the outer shell 7 is a helical scraper 18 and a helical chip removal groove 19. The scraper 18 is provided with a blade edge and the blade body is a straight wall and the blade body at the rear of the blade edge and chip removal. The groove bottom of the groove 19 is slope-shaped; the helical angle of the scraper 18 and the chip removal groove 19 is set between 30 degrees and 50 degrees; The helical directions of the chip removal grooves 19 are opposite and the helical angles are the same; at least two liquid passage holes 15 are provided in the guide cone 21 at the bottom of the outer wall of the outer casing 7 .

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

1. As shown in FIG. 1, after the anti-jamming device 29 in the figure is assembled before use, it is suspended below the testing instrument 28 through the downhole wire 1 and the lifting ring or the lifting hole 22;

2. Downhole test: use the 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 it down at a constant speed.

3. When encountering a slight jam, if the adhesive in the wall of the oil pipe 30 is soft, under the action of gravity, the scraper 18 and the chip removal groove 19 on the outer wall of the anti-jamming device 29 can be used to remove the adhesive. The material and scale are removed to ensure one-time smooth well access and completion of the test.

4. When serious jamming is encountered and the ground determines that the anti-jamming device 29 cannot be lowered, the operation on the ground is switched to the backwashing process: when the wellwashing water enters down from the top of the casing 31 and flows from the bottom of the tubing 30 When the bottom returns, 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 pushes the device to rotate rapidly and move upward. The scale, adhesion and other blockages in the pipe wall are scraped off, the scraped scale will fall off through the groove of the chip removal groove 19, and the larger impurities will fall off to the bottom of the artificial well.

5. When the downhole jam is removed and the impurities and dirt are discharged, the backwashing process on the ground can be closed, the liquid pressure in the well can be released, and the test operation can be continued. If you encounter a more serious blockage again, you can take the same operation method to remove the blockage.

6. When serious jamming is encountered and the jamming cannot be removed by the above method: the test instrument 28 can be used to hit the disconnector in the present invention downwards, so that the receiving body 16 moves downwards. When the bayonet connecting spring 4 is stretched and pulled out of the bayonet slot 5 of the outer casing and the pulling bayonet 17 is ejected into the withdrawal slot 6, the receiving body 16 is separated from the outer casing 7; at this time, the test can be The instrument 28 as well as the connecting cap 2 and the quick connector 3 in the anti-jamming device 29 are removed from the well.

7. After the test instrument 28 and the disconnector are withdrawn from the well, normal water injection is resumed: the injected water enters from the upper part of the outer casing 7 left in the well, and the water injection pressure opens the sealing ball 10 downward and continues downward from the check valve 14 , flows into the oil pipe 30 through the liquid passage hole 15 and then injects into the formation to complete the normal water injection work.

8. The normal water injection operation when the check valve 14 fails and cannot be opened: 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 hangs on the edge of the water injection recovery opening 9 The part is pressed into the water injection recovery opening hole 9, the one-way sealing pin 26 falls off downward, and the injected water enters from the water injection recovery opening hole 9, flows out from the liquid passage hole 15, and flows into the oil pipe 30 and the formation to ensure the normal water injection well. Fill normally.

9. The outer casing 7 left in the oil pipe 30 can be taken out when the workover operation is required, so that the test instrument and the present invention can go down the well in one trip, that is, the drilling operation and the test work are completed, and the test instrument is avoided. Or the workover operation after the well-passing instrument is stuck, has a remarkable use effect and can produce good economic benefits.

The above-described embodiments 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 inspiration of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the creative spirit and creative idea of the present invention shall be included within the protection scope of the present invention. Therefore, the scope of protection is not limited to the above description.

Claims (10)

1. An anti-jamming device for a water injection well testing instrument, comprising an outer casing (7), and a guide cone (21) is arranged at the bottom of the outer casing (7), characterized in that: the outer wall of the outer casing (7) is provided with a scraper (8) and the guide groove (20), the upper part of the inner cavity of the outer shell (7) is provided with the outer shell bayonet slot (5) and the pin withdrawal slot (6), and the lower inner cavity of the outer shell (7) is equipped with a check valve ( 14) and a liquid passage hole (15) is provided in the guide cone (21), and the outer casing (7) is connected to the disconnector through the outer casing bayonet groove (5); The disconnector is provided with a connecting cap (2) and a quick connector (3). The connector bayonet groove (25) at the lower part of the quick connector (3) is provided with a lift bayonet (17) and can pass the lift bayonet (17). ) to hold the release connector in the outer casing bayonet groove (5) of the outer casing (7), when the release connector is knocked down and falls down, it can be held in the return pin by the pull-up bayonet (17). The upper part of the quick connector (3) is suspended in the connecting cap (2) and connected under the testing instrument (28) through the connecting cap (2) and the downhole wire (1). 2 . The anti-jamming device for water injection well testing instruments according to claim 1 , wherein the connecting cap ( 2 ) in the disconnector is formed by butting two symmetrical cap bodies, and each cap body Each is provided with a suspension step (24), a strong magnet (23) and a lifting ring or a lifting hole (22). Or in the cap body below the hanging hole (22); when the suspension steps (24) in the two cap bodies are butted together, they can be installed into the suspension plate on the upper part of the quick connector (3). 3 . The anti-jamming device for water injection well testing instruments according to claim 2 , wherein the outer wall of the quick connector ( 3 ) in the decoupler is formed by the suspension groove and the connector bayonet groove ( 25 ) from the top respectively. 4 . The bottom is divided into a suspension plate, a receiving body (16) and a chassis, wherein: the outer circle of the suspension 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). The groove height is greater than the height of the hanging step (24); There is a clearance fit between the receiving body (16) and the base plate and the central hole of the outer casing (7), and a pull-up bayonet (17) can be installed in the bayonet bayonet groove (25) of the joint. 4. The anti-jamming device for water injection well testing instruments according to claim 1 or 3, characterized in that, the lifting bayonet (17) is a split pin, and is located at the opening of the lifting bayonet (17). Welding bayonet connection spring (4); pin withdrawal groove (6) is located below bayonet groove (5) of outer casing and has an inner diameter larger than that of bayonet groove (5) of outer casing. 5. The anti-jamming device for water injection well testing instruments according to claim 4, wherein the inner cavity of the outer casing (7) is divided into three hollow spaces by the valve seat plate (8) and the spring seat (13). The outer shell bayonet slot (5) and the pin withdrawal slot (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 outer shell The lower cavity of the body (7) communicates with the guide cone (21). 6 . The anti-jamming device for water injection well testing instruments according to claim 5 , wherein the valve seat plate ( 8 ) is arranged in the middle of the inner cavity of the outer casing ( 7 ), and the center of the valve seat plate ( 8 ) The hole is a conical hole with a chamfer at the lower end, and the conical hole is matched with the sealing ball (10) of the check valve (14); on the plate body of the valve seat plate (8) on the outer periphery of the conical hole A water injection recovery opening hole (9) is provided, and a one-way sealing pin (26) is also installed in the water injection recovery opening hole (9), and the water injection recovery opening hole (9) and the one-way sealing pin (26) constitute water injection Work resume switch. 7 . The anti-jamming device for water injection well testing instruments according to claim 6 , wherein the aperture of the water injection recovery opening hole ( 9 ) is small in the upper part and large in the lower part, and is consistent with the shape of the one-way sealing pin ( 26 ). 8 . The one-way sealing pin (26) has a clearance fit; the one-way sealing pin (26) is a cylinder with a small outer diameter and a large bottom, and the top of the one-way sealing pin (26) and the top of the water injection recovery opening hole (9) Riveted. 8 . The anti-jamming device for water injection well testing instruments according to claim 6 , wherein the aperture of the water injection recovery opening hole ( 9 ) is small in the upper part and large in the lower part, and is consistent with the shape of the one-way sealing pin ( 26 ). The one-way sealing pin (26) has a clearance fit; the one-way sealing pin (26) is composed of a pin fixing body (27) and a sealing pin body, and the pin fixing body (27) with a small outer diameter is threadedly connected to the sealing pin body with a large outer diameter , a suspension wing with a thickness of 0.8mm-1.1mm is arranged on the top of the pin fixing body (27) with small outer diameter, and the suspension wing can be a circular edge arranged on the top of the pin fixing body (27) or evenly distributed on Strip wings around the top perimeter of the pin holder (27). 9. The anti-jamming device for water injection well testing instruments according to claim 1, wherein 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 at the lower part of the inner cavity of the outer casing (7) and provided with a central hole. The lower end of the sealing spring (12) is fixed on the plate outside the central hole of the spring seat (13). The sealing spring (13) The upper end of 12) is fixed with a sealing ball seat (11), and the sealing ball (10) is installed between the central hole of the valve seat plate (8) and the sealing ball seat (11). 10. The anti-jamming device for water injection well testing instruments according to claim 5, wherein the upper part of the outer wall of the outer casing (7) is a helical scraper (18) and a helical chip removal groove (19) , the scraper (18) is provided with a cutting edge and the blade body is a straight wall, and the blade body at the rear of the cutting edge and the groove bottom of the chip removal groove (19) are slope-shaped; the scraper (18) and the chip removal groove ( 19) The helix angle is set between 30 degrees and 50 degrees; the guide groove (20) provided at the lower part of the outer wall of the outer shell (7) and the helix of the scraper (18) and the chip removal groove (19) The directions are opposite and the helix angles are the same; at least two liquid passage holes (15) in the guide cone (21) at the bottom of the outer wall of the outer casing (7) are provided.

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