Dropping-fishing-free injection allocation device and system

Abstract

The invention discloses a dropping-fishing-free injection allocation device and system, and solves the technical problem that in the prior art, when layered injection pressure is adjusted, an injection allocation device needs to be replaced for multiple times. Comprising an upper joint, a lower joint and an outer cylinder, the upper joint is provided with a first channel; the lower joint comprises a main body and an inner sleeve movably connected in the main body; the main body is provided with a second channel communicated with the first channel and a liquid outlet communicated with the second channel; the inner sleeve can reciprocate relative to the main body, so that the second channel is communicated with or disconnected from the liquid outlet, a depressurization groove is formed in the outer wall of the inner sleeve, and the main body and the inner sleeve are coaxially arranged; the outer cylinder is fixedly connected with the upper joint and the lower joint; when the inner sleeve moves relative to the main body and the second channel is communicated with the liquid outlet, the polymer passes through the pressure reducing groove and the conical space between the outer cylinder and the pressure reducing groove through the second channel, then flows to the liquid outlet and is injected into an oil layer; layered injection pressure and injection amount adjustment can be achieved through reciprocating movement of the inner sleeve, the injection allocation device does not need to be replaced for multiple times, and the throwing-fishing-free injection allocation effect is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas field development, and specifically relates to a casting-free injection device and system. Background Art

[0002] As the global demand for oil increases year by year, the original secondary oil recovery technology is no longer sufficient to meet the needs of the development of the times. Tertiary oil recovery technology has emerged. It uses the combined effects of physical and chemical reactions to achieve the purpose of improving oil recovery and displacement efficiency. Polymer flooding technology is one of the tertiary oil recovery technologies. It introduces some soluble high-molecular polymers into water, reduces its permeability on the basis of increasing the viscosity of the water phase, so as to optimize the oil-water mobility ratio to expand the sweep coefficient, thereby achieving the purpose of improving oil recovery. In the process of polymer flooding development, a general injection method is adopted, which is seriously affected by the heterogeneity of the oil layer, and the high and low permeability layers are quite different. In order to improve the development effect of polymer flooding, alleviate the contradiction between layers, and avoid the serious invalid circulation of the high permeability layer and the low utilization degree of the low permeability layer, a layered injection process must be adopted. The commonly used polymer flooding injection process is the eccentric injection process. The downhole tubing adopts a single-tube eccentric injection form, and each layer section is separated by a packer. Each layer section corresponds to a first-level eccentric dispenser.

[0003] During the polymer injection process, a throttling pressure difference may be formed when the polymer solution flows through the injector. When adjusting the stratified injection pressure, the injector needs to be replaced by ground wire operation to adjust the stratified injection pressure and control the injection amount of each layer, so as to achieve the purpose of stratified injection. However, this method has problems such as low success rate of casting and fishing, long test cycle, and failure of each layer to meet the injection requirements, which limits the utilization of the oil layer, greatly reduces the polymer flooding effect, and seriously affects the stable oil and gas production of the oilfield company. Summary of the invention

[0004] In order to solve the current technical problem of needing to replace the dispenser multiple times when adjusting the layered injection pressure, the present application provides a cast-free dispenser and system.

[0006] In a first aspect of the present application, there is provided a casting-free dispensing device comprising an upper joint, a lower joint and an outer barrel;

[0007] The upper joint is a rotating body and is provided with a first channel for the polymer to pass through;

[0008] The lower joint comprises a main body and an inner sleeve movably connected to the inside of the main body; the main body is provided with a second channel and a liquid outlet connected to the second channel, and the second channel is connected to the first channel; the inner sleeve can reciprocate relative to the main body to connect or disconnect the second channel with the liquid outlet, and the outer wall of the inner sleeve has a pressure reduction groove arranged near the liquid outlet;

[0009] The outer cylinder is fixedly connected to the upper joint and the lower joint;

[0010] Wherein, the main body and the inner sleeve are coaxially arranged.

[0011] In some embodiments, the inner sleeve has an abutment portion, and the pressure reduction groove is arranged between the liquid outlet and the abutment portion. When the abutment portion abuts against the main body, the second channel is disconnected from the liquid outlet; when the abutment portion is separated from the main body, the second channel is connected to the liquid outlet.

[0012] In some embodiments, the pressure reducing groove includes a plurality of annular grooves; the annular grooves are arranged in sequence along the axial direction of the inner sleeve.

[0013] In some embodiments, a clamping hole for connecting to an adjusting device is provided at one end of the inner sleeve away from the pressure reducing groove to drive the inner sleeve to reciprocate relative to the main body.

[0014] In some embodiments, a limiting ring is provided on the inner wall of the main body along the circumferential direction, and the limiting ring is located between the clamping hole and the pressure reducing groove; the limiting ring abuts against the inner sleeve.

[0015] In some embodiments, the limiting ring is threadedly connected to the inner sleeve.

[0016] In some embodiments, a limiting boss is provided on the outer wall of the inner sleeve along the circumferential direction, the limiting boss is located between the pressure reducing groove and the limiting ring, and the limiting boss abuts against the inner wall of the main body.

[0017] In some embodiments, a seal is provided between the main body and the inner sleeve, and the seal is arranged away from the upper joint.

[0018] In some embodiments, the outer tube is connected to the upper joint and the lower joint through a pin; and a sealing member is provided between the outer tube and the upper joint and the lower joint.

[0019] In a second aspect of the present application, a casting-free injection system is provided, comprising a plurality of injection units arranged in sequence along the axial direction of the well, the injection unit comprising a packer, an injection pipe and the casting-free injection dispenser; the injection pipe connects the packer and the casting-free injection dispenser; the injection pipe at the tail end is connected to a constant pressure ball seat.

[0020] The non-casting and scooping dispenser and system provided in the embodiment of the present application include an upper joint, a lower joint, and an outer barrel; the upper joint is a rotating body, provided with a first channel for polymer to pass through; the lower joint includes a main body and an inner sleeve movably connected to the inside of the main body; the main body is provided with a second channel and a liquid outlet connected to the second channel, and the second channel is connected to the first channel; the inner sleeve can reciprocate relative to the main body to connect or disconnect the second channel with the liquid outlet, and the outer wall of the inner sleeve has a pressure reduction groove arranged near the liquid outlet; the outer barrel is fixedly connected to the upper joint and the lower joint; wherein the main body and the inner sleeve are coaxially arranged;

[0021] During the injection process of the dispenser of the present application, the polymer flows from the first channel to the second channel. When the inner sleeve moves relative to the main body and the second channel is connected with the liquid outlet, the polymer flows from the second channel through the connecting position to the pressure reducing groove, and then flows to the liquid outlet after being depressurized in the pressure reducing groove, and finally is injected into the oil layer from the liquid outlet to achieve the polymer injection effect; when the inner sleeve moves relative to the main body and the second channel is disconnected from the liquid outlet, the polymer injection is stopped; compared with the prior art, the present application can realize layered injection pressure regulation through the reciprocating movement of the inner sleeve, and realizes injection volume regulation while adjusting the injection pressure, and there is no need to replace the dispenser multiple times, so as to achieve the injection effect without casting and fishing; at the same time, the inner sleeve is coaxially arranged with the main body, which is less likely to cause polymer blockage than the eccentric arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a casting-free and scoop-free dispenser in an embodiment of the present application is shown.

[0023] Figure 2 A schematic structural diagram of a casting-free and scoop-free injection system in an embodiment of the present application is shown.

[0024] Description of reference numerals:

[0025] 100, non-casting and scooping injection device; 200, packer; 300, constant pressure ball seat; 400, screen tube; 500, thread plug;

[0026] 110, upper joint;

[0027] 120. Outer cylinder;

[0028] 130, lower connector;

[0029] 131. Main body; 132. Inner sleeve; 133. Pressure reducing groove. DETAILED DESCRIPTION

[0030] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] The first embodiment of the present application provides a scoop-free injection dispenser to achieve stratified injection pressure regulation without scooping.

[0032] See also Figure 1 The casting-free dispensing device provided in the embodiment of the present application includes an upper joint 110, a lower joint 130 and an outer tube 120; the upper joint 110 is a rotating body, provided with a first channel for polymer to pass through; the lower joint 130 includes a main body 131 and an inner sleeve 132 movably connected to the inside of the main body 131; the main body 131 is provided with a second channel and a liquid outlet connected to the second channel, and the second channel is connected to the first channel; the inner sleeve 132 can reciprocate relative to the main body 131 to connect or disconnect the second channel with the liquid outlet, and the outer wall of the inner sleeve 132 has a pressure reducing groove 133 arranged near the liquid outlet; the outer tube 120 is fixedly connected to the upper joint 110 and the lower joint 130; wherein the main body 131 and the inner sleeve 132 are coaxially arranged.

[0033] In some embodiments, the upper joint 110 and the lower joint 130 are both tubes, and the outer walls of the upper joint 110 and the lower joint 130 are both provided with connection holes for detachable connection with the outer tube 120; in some embodiments, the upper joint 110 and the lower joint 130 are both provided with sealing grooves, and the sealing grooves are provided with sealing rings, and the sealing rings are in contact with the outer tube 120; in some embodiments, a plurality of sealing rings are provided, and are spaced apart along the axial direction of the upper joint 110;

[0034] In some embodiments, the upper joint 110 includes a first pipe section and a second pipe section, the first pipe section is fixedly connected to the second pipe section, the diameter of the second pipe section is larger than that of the first pipe section, the second pipe section is provided with a connecting hole connected to the outer tube 120, the outer wall of the second pipe section is in shape with the inner wall of the outer tube 120, and the outer wall of the second pipe section is provided with a plurality of sealing grooves along the axial direction of the upper joint 110, a sealing ring is provided in the sealing groove, and the sealing ring abuts against the outer tube 120 to seal the upper joint 110 and the outer tube 120.

[0035] In some embodiments, the main body 131 includes a first main body and a second main body that are detachably connected, and the first main body is close to the upper joint 110; in some embodiments, a connecting hole connected to the second main body is provided on the side of the first main body away from the upper joint 110, and the first main body and the second main body are connected by a pin; in some embodiments, a liquid outlet is provided on the first main body; in some embodiments, a sealing groove is provided on the second main body, a sealing ring is provided in the sealing groove, and the sealing ring abuts against the first main body to seal the first main body and the second main body; in some embodiments, a side of the first main body close to the upper joint 110 is in shape with the inner wall of the outer tube 120, and a plurality of sealing grooves are provided on the outer wall of the first main body along the axial direction of the upper joint 110, a sealing ring is provided in the sealing groove, and the sealing ring abuts against the outer tube 120 to seal the first main body and the outer tube 120.

[0036] In some embodiments, the inner sleeve 132 is a rotating body, which is arranged inside the main body 131. The length of the inner sleeve 132 is less than that of the main body 131. The inner sleeve 132 can reciprocate along the axial direction of the main body 131 so that the end of the inner sleeve 132 away from the upper joint 110 abuts against or separates from the main body 131.

[0037] In some embodiments, a pressure reducing groove 133 is fixedly connected to the outer wall of the inner sleeve 132, and the pressure reducing groove 133 is close to the second main body; in some embodiments, there is a moving channel between the pressure reducing groove and the main body, and the moving channel is an annular cavity so that the polymer flows along the moving channel to the liquid outlet; in some embodiments, the size of the annular space of the moving channel close to the upper joint is smaller than the size of the annular space of the moving channel away from the upper joint.

[0038] In some embodiments, the inner sleeve 132 has an abutment portion, and the pressure reduction groove 133 is arranged between the liquid outlet and the abutment portion. When the abutment portion abuts against the main body 131, the second channel is disconnected from the liquid outlet; when the abutment portion is separated from the main body 131, the second channel is connected to the liquid outlet; in some embodiments, the end of the inner sleeve 132 away from the upper joint 110 is the abutment portion, and the pressure reduction groove 133 is fixedly connected to the outer wall of the inner sleeve 132 along the circumferential direction.

[0039] In some embodiments, the pressure reduction groove 133 includes a plurality of annular grooves, and the layered injection pressure is adjusted by the number of annular grooves through which the polymer passes; the annular grooves are arranged in sequence along the axial direction of the inner sleeve 132; in some embodiments, there are 5, 8, or 10 annular grooves.

[0040] In some embodiments, a snap-in hole for connecting the adjusting device is provided at one end of the inner sleeve 132 away from the pressure reducing groove 133 to drive the inner sleeve 132 to reciprocate relative to the main body 131; in some embodiments, a plurality of snap-in holes are provided at one end of the inner sleeve 132 close to the upper joint 110, which are arranged at intervals along the circumference of the inner sleeve 132.

[0041] In some embodiments, a limiting ring is provided on the inner wall of the main body 131 along the circumferential direction, and the limiting ring is located between the clamping hole and the pressure reducing groove 133; the limiting ring abuts against the inner sleeve 132 to prevent the polymer from flowing to the liquid outlet along the connection position between the main body 131 and the inner sleeve 132; in some embodiments, the limiting ring is threadedly connected to the inner sleeve 132.

[0042] In some embodiments, the outer wall of the inner sleeve 132 is provided with a limiting boss along the circumferential direction, the limiting boss is located between the pressure reducing groove 133 and the limiting ring, and the limiting boss abuts against the inner wall of the main body 131 to increase the sealing effect. In some embodiments, the limiting boss is threadedly connected to the inner wall of the main body 131.

[0043] In some embodiments, a seal is provided between the main body 131 and the inner sleeve 132, and the seal is arranged away from the upper joint 110; to increase the sealing effect between the main body 131 and the inner sleeve 132; in some embodiments, a sealing groove is provided on the inner wall of the second main body, and a sealing ring is provided in the sealing groove. When the abutting portion abuts on the second main body, the sealing ring abuts on the inner sleeve 132 to strengthen the sealing between the second main body and the inner sleeve 132.

[0044] In some embodiments, the outer cylinder 120 is connected to the upper joint 110 and the lower joint 130 through a pin; a sealing member is provided between the outer cylinder 120 and the upper joint 110 and the lower joint 130 to enhance the sealing effect.

[0045] In some embodiments, the pressure reducing tank 133 includes a pressure reducing tank body and a protective layer coated on the pressure reducing tank body to increase the service life of the equipment. In some embodiments, the pressure reducing tank body is made of aluminum alloy to reduce the weight of the equipment; in some embodiments, the protective layer is made of plastic or resin.

[0046] The second embodiment of the present application provides a dredging-free injection system to achieve stratified injection pressure regulation without dredging.

[0047] See also Figure 2 The scoop-free injection system provided in the embodiment of the present application includes a plurality of injection units arranged in sequence along the axial direction of the well, and the injection unit includes a packer 200, an injection pipe and a scoop-free injection dispenser 100; the injection pipe connects the packer 200 and the scoop-free injection dispenser 100; the injection pipe at the tail end is connected with a constant pressure ball seat 300, a screen pipe 400 and a wire plug 500; in some embodiments, the packer 200 is a washable well packer.

[0048] The following is a detailed description of the method for using the non-casting and scooping dispenser and system of the present application:

[0049] Step 1: Use the injection traction device to lower the injection pipe. After the injection pipe is lowered to the designed depth, the oil pipe is subjected to ball dropping and pressure operation, and the packer is seated to achieve the isolation of each layer section;

[0050] Step 2: lowering the downhole measuring and adjusting instrument to connect with the non-casting and fishing injector to form a layered polymer injection channel;

[0051] Step 3, after the polymer solution is injected from the injection station to the wellhead, the polymer solution is injected into the well using the injection pipe, and the layered injection of each layer is realized by the non-casting and fishing injection device; specifically, the following steps are performed: the electric regulator is used to grasp the clamping hole, and the electric regulator drives the inner sleeve 132 to rotate, so that the inner sleeve 132 moves back and forth along the axial direction of the lower joint 130; the relative position of the inner sleeve 132 and the liquid outlet is adjusted, and the reciprocating movement of the inner sleeve 132 drives the pressure reduction groove 133 fixedly connected thereto to move back and forth, so that the relative position of the pressure reduction groove 133 and the liquid outlet changes, and the polymer passes through the pressure reduction groove 133 in the process of passing from the second channel into the liquid outlet; by adjusting the pressure reduction groove The relative position of 133 and the liquid outlet can adjust the number of annular grooves on the pressure reducing groove 133 through which the polymer passes, thereby adjusting the injection pressure. At the same time, since there is a moving channel between the pressure reducing groove 133 and the main body 131, and the annular space at one end of the moving channel close to the upper joint is different in size from the annular space at one end far from the upper joint, that is, in the process of the polymer flowing through the moving channel to the liquid outlet, it flows from a larger space to a smaller space, and the change in the spatial size of the moving channel further adjusts the injection pressure. The annular groove and the moving channel act together on the polymer and cooperate with each other to achieve injection pressure regulation, and the injection amount is adjusted while adjusting the injection pressure.

[0052] The non-casting and scooping dispenser and system of the present application have at least the following advantages:

[0053] (1) The non-casting and scooping dispensing device of the present application comprises an upper joint, a lower joint, and an outer tube; the upper joint is a rotating body, provided with a first channel for polymer to pass through; the lower joint comprises a main body and an inner sleeve movably connected to the inside of the main body; the main body is provided with a second channel and a liquid outlet connected to the second channel, and the second channel is connected to the first channel; the inner sleeve can reciprocate relative to the main body to connect or disconnect the second channel with the liquid outlet, and the outer wall of the inner sleeve has a pressure reducing groove arranged near the liquid outlet; the outer tube is fixedly connected to the upper joint and the lower joint; wherein the main body and the inner sleeve are arranged coaxially; during the dispensing process of the dispensing device of the present application, the polymer flows from the first channel into the second channel When the inner sleeve moves relative to the main body and the second channel is connected to the liquid outlet, the polymer reaches the pressure reducing groove from the second channel through the connecting position, and then flows to the liquid outlet after the pressure is reduced in the pressure reducing groove, and finally is injected into the oil layer from the liquid outlet to achieve the polymer injection effect; when the inner sleeve moves relative to the main body and the second channel is disconnected from the liquid outlet, the polymer injection is stopped; compared with the prior art, the present application can realize the adjustment of the layered injection pressure through the reciprocating movement of the inner sleeve, and realizes the adjustment of the injection volume while adjusting the injection pressure, without the need to replace the dispenser multiple times, and realizes the injection effect without casting and fishing; at the same time, the inner sleeve is coaxially arranged with the main body, which is less likely to cause polymer blockage than the eccentric arrangement.

[0054] (2) The non-casting and scooping injection dispenser of the present application, through the regulating effect of the regulating device connected to the clamping hole on the inner sleeve, causes the inner sleeve to reciprocate relative to the main body along the axial direction of the lower joint. The reciprocating movement of the inner sleeve drives the pressure reducing groove fixedly connected on the inner sleeve to reciprocate relative to the main body along the axial direction of the lower joint. The relative position between the liquid outlet on the main body and the pressure reducing groove changes, that is, the pressure reducing groove can be located at or near the liquid outlet near one end of the second main body, located at or near the liquid outlet near one end of the upper joint, or directly opposite to the liquid outlet. Since the pressure reducing groove is provided with a plurality of annular grooves, the polymer will pass through the pressure reducing groove in the process of flowing from the second channel to the liquid outlet. By adjusting the relative position between the pressure reducing groove and the liquid outlet, the number of annular grooves passed by the polymer can be adjusted, thereby adjusting the injection pressure. While adjusting the injection pressure, the injection amount is adjusted. The present application realizes downhole adjustment without the need to cast and scoop to replace the injector, thereby achieving a casting and scooping-free injection effect.

[0055] (3) The non-drilling injection dispenser of the present application has a movable channel between the pressure reducing groove and the main body. The movable channel is an annular cavity so that the polymer can flow along the movable channel to the liquid outlet. The size of the annular space at the end of the movable channel close to the upper joint is smaller than the size of the annular space at the end of the movable channel far from the upper joint. In the process of the polymer flowing through the movable channel to the liquid outlet, it flows from a larger space to a smaller space. The change in the spatial size of the movable channel further adjusts the injection pressure. The annular groove and the movable channel act on the polymer together and cooperate with each other to achieve downhole injection pressure regulation. The injection pressure is adjusted while the injection volume is adjusted. There is no need to cast and replace the injector multiple times, thereby achieving a non-drilling injection effect.

[0056] (4) The non-casting and scooping injection dispenser of the present application has a main body and an inner sleeve coaxially arranged, and the inner sleeve is movably connected to the inside of the main body and can reciprocate relative to the main body to connect or disconnect the second channel with the liquid outlet. At the same time, the size of the annular space at the end of the moving channel close to the upper joint is smaller than the size of the annular space at the end of the moving channel away from the upper joint. When the injection dispenser between the pressure reducing groove and the main body is blocked, the position of the inner sleeve relative to the main body can be adjusted by the adjusting device, thereby adjusting the size of the moving channel between the inner sleeve and the main body to solve the blockage problem.

[0057] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A non-casting and scooping dispenser for dispensing polymers, characterized in that: include: The upper joint is a rotating body and is provided with a first channel for the polymer to pass through; The lower joint comprises a main body and an inner sleeve movably connected to the inside of the main body; the main body is provided with a second channel and a liquid outlet connected to the second channel, and the second channel is connected to the first channel; the inner sleeve can reciprocate relative to the main body to connect or disconnect the second channel with the liquid outlet, and the outer wall of the inner sleeve has a pressure reduction groove arranged near the liquid outlet; An outer cylinder fixedly connecting the upper joint and the lower joint; Wherein, the main body and the inner sleeve are coaxially arranged.

2. The non-casting and scooping dispenser according to claim 1, characterized in that: The inner sleeve has an abutment portion, and the pressure reduction groove is arranged between the liquid outlet and the abutment portion. When the abutment portion abuts against the main body, the second channel is disconnected from the liquid outlet; when the abutment portion is separated from the main body, the second channel is connected to the liquid outlet.

3. The casting-free injection dispenser according to claim 1, characterized in that: The pressure reducing groove comprises a plurality of annular grooves; the annular grooves are arranged in sequence along the axial direction of the inner sleeve.

4. The casting-free injection dispenser according to claim 1, characterized in that: The inner sleeve is provided with a clamping hole for connecting with an adjusting device at one end away from the pressure reducing groove, so as to drive the inner sleeve to move back and forth relative to the main body.

5. The casting-free injection dispenser according to claim 4, characterized in that: A limiting ring is provided on the inner wall of the main body along the circumferential direction, and the limiting ring is located between the clamping hole and the pressure reducing groove; the limiting ring abuts against the inner sleeve.

6. The non-casting and scooping dispenser according to claim 5, characterized in that: The limiting ring is threadedly connected to the inner sleeve.

7. The non-casting and scooping dispenser according to claim 5, characterized in that: The outer wall of the inner sleeve is provided with a limiting boss along the circumferential direction, the limiting boss is located between the pressure reducing groove and the limiting ring, and the limiting boss abuts against the inner wall of the main body.

8. The casting-free injection dispenser according to any one of claims 1 to 3, characterized in that: A sealing member is provided between the main body and the inner sleeve, and the sealing member is arranged away from the upper joint.

9. The casting-free injection dispenser according to any one of claims 1 to 3, characterized in that: The outer tube is connected to the upper joint and the lower joint through a pin; a sealing member is arranged between the outer tube and the upper joint and the lower joint.

10. A dredging-free injection system for layered polymer injection, characterized in that: It comprises a plurality of injection units arranged in sequence along the axial direction of the well, the injection units comprising a packer, an injection pipe and the casting-free injection dispenser as described in claims 1 to 8; the injection pipe connects the packer and the casting-free injection dispenser; the injection pipe at the tail end is connected with a constant pressure ball seat.

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