Oil-water well composite crosslinking plugging agent injection device

Abstract

The utility model provides a composite cross-linking plugging agent injection device for an oil-water well. The composite cross-linking plugging agent injection device comprises a cross-linking plugging agent storage box, a plugging agent extrusion mechanism, a plurality of extrusion pipes and an annular flow guide shell. A crosslinking plugging agent input pipe is arranged at the upper end of the crosslinking plugging agent storage box; a plurality of plugging agent extrusion openings are uniformly formed in the side wall of the cross-linked plugging agent storage box, and the cross-linked plugging agent input pipe is used for being connected with a plugging agent conveying source on the upper portion of an oil well; the cross-linked plugging agent storage box is used for storing the cross-linked plugging agent conveyed by the plugging agent conveying source; a plugging agent extrusion mechanism is arranged at the upper end of the cross-linking plugging agent storage box and is used for extruding a cross-linking plugging agent in the cross-linking plugging agent storage box through a plurality of plugging agent extrusion ports under preset pressure; the multiple extrusion pipes are installed on the multiple plugging agent extrusion openings in a one-to-one correspondence mode and extend in the horizontal direction. The annular flow guide shell is arranged on the side wall of the cross-linking plugging agent storage box in a sleeving manner in the circumferential direction; a flange ring is mounted at the front end of the crosslinking plugging agent input pipe; liquid extrusion openings of the extrusion pipes penetrate through the annular flow guide shell and extend out of the annular flow guide shell; and the plurality of extrusion pipes are used for uniformly spraying the cross-linking plugging agent in the cross-linking plugging agent storage box to a preset position of the well wall in the circumferential direction of the oil well.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and water well downhole working equipment field, more particularly, relate to a kind of oil and water well composite crosslinking plugging agent injection device. BACKGROUND

[0002] In the exploitation of high water cut oilfield, the selective water plugging of high water cut oil well can be caused by various reasons in the production process. When the water cut of the oil well increases rapidly due to the channeling of formation water along high permeability layers or fractures, the water channel needs to be plugged by crosslinking plugging agent to retain the oil and gas flow channel. After the crosslinking plugging agent is injected, a gel or solid with certain strength is formed in the target layer (such as water layer or high permeability layer) through crosslinking reaction, selectively plugging the water flow channel, reducing water production and improving oil well productivity.

[0003] At present, during the injection process of crosslinking plugging agent, high-pressure injection is usually used. The injection device is inserted into the oil well and lowered to the oil layer position that needs to be plugged by crosslinking plugging agent, for injecting crosslinking plugging agent into the inner wall of the oil well at this position. The existing injection device is in overall cylindrical structure, and the cylindrical surface is uniformly provided with perforations. The upper end center of the cylinder is provided with a liquid inlet hole. The upper end of the liquid inlet hole is connected to a plunger pump through a hose. The suction pipe of the plunger pump is connected to the liquid pool of the crosslinking plugging agent. The plunger pump operates to suck the crosslinking plugging agent, which is then discharged into the cylindrical structure from the hose and the through pipe, and finally sprayed to the oil well wall surface through the perforations uniformly arranged on the cylindrical surface. During the spraying process of the existing injection device, the upward channeling high-pressure oil and gas from the lower side can easily blow the sprayed crosslinking plugging agent upward to other positions on the upper side, resulting in poor injection effect during the spraying process and causing the crosslinking plugging agent to lose control. SUMMARY

[0004] The utility model aims to provide a kind of oil and water well composite crosslinking plugging agent injection device, to solve the problem of poor injection effect during the spraying process caused by the upward channeling high-pressure oil and gas from the lower side blowing the sprayed crosslinking plugging agent to other positions on the upper side, causing the crosslinking plugging agent to lose control, polluting the oil well and causing the crosslinking plugging agent to be wasted.

[0005] To achieve the above object, the oil-water well composite cross-linking plugging agent injection device comprises: a cross-linking plugging agent storage box, the upper end of the cross-linking plugging agent storage box is provided with a cross-linking plugging agent input pipe, a plurality of plugging agent extrusion openings are uniformly arranged on the side wall of the cross-linking plugging agent storage box, and the cross-linking plugging agent input pipe is connected with a plugging agent conveying source at the upper part of the oil well; the cross-linking plugging agent storage box is used for storing the cross-linking plugging agent conveyed by the plugging agent conveying source; a plugging agent extrusion mechanism is arranged at the upper end of the cross-linking plugging agent storage box, and the plugging agent extrusion mechanism is used for extruding the cross-linking plugging agent in the cross-linking plugging agent storage box out through the plurality of plugging agent extrusion openings at a preset pressure; a plurality of extrusion pipes are installed on the plurality of plugging agent extrusion openings in one-to-one correspondence and respectively extend along the horizontal direction; an annular flow guide shell is arranged on the side wall of the cross-linking plugging agent storage box in a sleeving manner along the circumference; wherein, a flange ring is installed at the front end of the cross-linking plugging agent input pipe; the liquid outlet of the plurality of extrusion pipes extends to the outside of the annular flow guide shell through the annular flow guide shell; and the plurality of extrusion pipes are used for uniformly spraying the cross-linking plugging agent in the cross-linking plugging agent storage box to the preset position of the well wall along the circumference of the oil well.

[0006] Further, the cross-linking plugging agent storage box comprises: a cylindrical shell, the inside of the cylindrical shell forms a plugging agent storage cavity for storing the cross-linking plugging agent; a bottom cover, which is detachably installed on the lower end of the cylindrical shell; and an upper cover, which is detachably installed on the upper end of the cylindrical shell; wherein, a plurality of plugging agent extrusion openings are uniformly arranged on the side wall of the cylindrical shell along the circumference of the cylindrical shell; the cross-linking plugging agent input pipe is installed on the upper cover along the vertical direction and extends into the plugging agent storage cavity to convey the cross-linking plugging agent from the plugging agent conveying source into the plugging agent storage cavity; and the plugging agent extrusion mechanism is installed on the upper cover and extends into the plugging agent storage cavity to extrude the cross-linking plugging agent in the plugging agent storage cavity to the plurality of plugging agent extrusion openings along the vertical direction.

[0007] Further, the cross-linking plugging agent input pipe comprises: a flow guide pipe, which is installed on the upper cover along the vertical direction and extends into the plugging agent storage cavity, and the upper end of the flow guide pipe is connected with the plugging agent conveying source; a flow guide disc, which is arranged at the lower end of the flow guide pipe and is fixedly connected with the bottom cover, and a plurality of flow guide holes are uniformly and spacedly arranged on the circumference of the flow guide disc; and a plurality of one-way valves, which are installed on the plurality of flow guide holes in one-to-one correspondence; wherein, the plurality of one-way valves are used for unidirectionally conveying the cross-linking plugging agent through the flow guide pipe and the flow guide disc into the plugging agent storage cavity.

[0008] Further, the plugging agent extrusion mechanism comprises: a plurality of hydraulic cylinders, which are detachably mounted on the through holes reserved on the upper cover in the vertical direction; a plurality of hydraulic push rods, which are correspondingly and telescopically mounted in the plurality of hydraulic cylinders; and a ring-shaped extrusion plate, which is movably arranged in the vertical direction in the plugging agent storage cavity; wherein the upper end surface of the ring-shaped extrusion plate is fixedly connected with the lower end of the plurality of hydraulic push rods, the inner ring edge of the ring-shaped extrusion plate is slidably sleeved on the outer sidewall of the cross-linked plugging agent input pipe, and the outer ring edge of the ring-shaped extrusion plate is in sliding abutment with the inner sidewall of the plugging agent storage cavity; the ring-shaped extrusion plate is used to extrude the cross-linked plugging agent in the plugging agent storage cavity at a preset pressure through the plurality of plugging agent extrusion ports under the driving of the plurality of hydraulic push rods; and the limit position of the downward movement of the ring-shaped extrusion plate is higher than the mounting position of the one-way valve.

[0009] Further, the cross-linked plugging agent storage box further comprises: a plurality of oil and gas conduits, the upper ports of the plurality of oil and gas conduits extending to the upper space of the cross-linked plugging agent storage box through the upper cover; and the lower ports of the plurality of oil and gas conduits extending to the lower space of the cross-linked plugging agent storage box through the bottom cover; wherein the plurality of oil and gas conduits are uniformly and circumferentially arranged along the cylindrical shell.

[0010] Further, the plurality of extrusion pipes are uniformly and equiangularly distributed along the circumference of the cross-linked plugging agent storage box.

[0011] Further, the extrusion pipe comprises: a connecting head, which is detachably mounted on the plugging agent extrusion port; an elastic pipe body, the first end of which is fixedly connected with the connecting head; and a hard pipe body, the first end of which is fixedly connected with the second end of the elastic pipe body; wherein the annular flow guide shell is provided with a plurality of telescopic holes in the circumferential direction, and the hard pipe bodies of the plurality of extrusion pipes are correspondingly and telescopically mounted in the plurality of telescopic holes.

[0012] Further, the annular flow guide shell comprises: a sleeve ring; an upper annular drainage belt, which is mounted on the sidewall of the sleeve ring in the circumferential direction; and a lower annular drainage belt, which is mounted on the sidewall of the sleeve ring in the circumferential direction; wherein the plurality of extrusion pipes are located between the upper annular drainage belt and the lower annular drainage belt; and the upper annular drainage belt and the lower annular drainage belt are used to guide the oil and gas flowing upward from the lower side.

[0013] The utility model discloses a composite crosslinking plugging agent injection device of oil well, including crosslinking plugging agent storage box, plugging agent extrusion mechanism, a plurality of extrusion tubes, annular flow guide shell, the upper end of crosslinking plugging agent storage box has crosslinking plugging agent input pipe, and the lateral wall of crosslinking plugging agent storage box evenly is provided with a plurality of plugging agent extrusion mouth, and crosslinking plugging agent input pipe is used for connecting with the plugging agent delivery source of oil well upper portion, crosslinking plugging agent storage box is used for storing the crosslinking plugging agent that plugging agent delivery source delivery, plugging agent extrusion mechanism sets up the upper end of crosslinking plugging agent storage box, and plugging agent extrusion mechanism is used for with the crosslinking plugging agent in crosslinking plugging agent storage box with preset pressure through a plurality of plugging agent extrusion mouth extruding, a plurality of extrusion tubes, a plurality of extrusion tubes correspondingly install on a plurality of plugging agent extrusion mouths and respectively extend along the horizontal direction, annular flow guide shell is set on the lateral wall of crosslinking plugging agent storage box along the circumference, wherein, the front end of crosslinking plugging agent input pipe installs flange ring, and the extrusion mouth of a plurality of extrusion tubes extends to the outside of annular flow guide shell through annular flow guide shell, a plurality of extrusion tubes are used for the crosslinking plugging agent in crosslinking plugging agent storage box along the even spray of oil well's circumference to the preset position of well wall. Crosslinking plugging agent is pumped into the crosslinking plugging agent delivery pipe connected with flange ring by plunger pump, and crosslinking plugging agent delivery pipe guides crosslinking plugging agent into crosslinking plugging agent storage box, when lowering oil well, a plurality of oil and gas guide pipes connect bottom cover and upper cover, and the oil and gas of device lower side is drained to the upper side of device, after completing lowering, a plurality of hydraulic push rods in the plugging agent extrusion mechanism of plugging agent extrusion mechanism move downward, and the annular extrusion plate is pushed to the crosslinking plugging agent in crosslinking plugging agent storage box and is applied pressure, and the lateral wall of crosslinking plugging agent storage box evenly is provided with a plurality of plugging agent extrusion mouths, and a plurality of plugging agent extrusion mouths are connected with the connecting head of a plurality of extrusion tubes, and the hard pipe body of a plurality of extrusion tubes extends to the outside of annular flow guide shell, and plugging agent extrusion mechanism applies pressure, and the crosslinking plugging agent in crosslinking plugging agent storage box is evenly sprayed to the preset position of well wall along the circumference of oil well through a plurality of extrusion tubes, during the spray process, a plurality of extrusion tubes are located between the upper annular drainage zone and the lower annular drainage zone, and the upper annular drainage zone and the lower annular drainage zone are attached to the well wall of oil well, protect the influence of the high pressure oil and gas of the crosslinking plugging agent sprayed out and up. The injection device is not easy to be influenced by the high pressure oil and gas of the crosslinking plugging agent sprayed out and up during the working process of lowering oil well and spraying crosslinking plugging agent, and will not blow the crosslinking plugging agent sprayed out and up to other positions on the upper side, make the injection effect during the spray process poor, cause the crosslinking plugging agent to lose control, produce leakage and cause pollution, and the effect of injecting crosslinking plugging agent to the target horizon (such as water layer or high permeability layer) of oil well well wall is better. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The application will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0015] Figure 1It is an explosion structure schematic view of the oil-water well composite crosslinking plugging agent injection device according to the embodiment of the utility model.

[0016] Figure 2 It is a working state structure schematic view of the oil-water well composite crosslinking plugging agent injection device according to the embodiment of the utility model.

[0017] Figure 3 It is a front view full disassembly schematic view of the oil-water well composite crosslinking plugging agent injection device according to the embodiment of the utility model.

[0018] Figure 4 It is a front view schematic view of the oil-water well composite crosslinking plugging agent injection device according to the embodiment of the utility model.

[0019] Figure 5 It is Figure 4 The enlarged structure schematic view of A in the figure.

[0020] Figure 6 It is a top view schematic view of the oil-water well composite crosslinking plugging agent injection device according to the embodiment of the utility model.

[0021] Among them, the above-mentioned drawing includes the following figure marks:

[0022] 10, crosslinking plugging agent storage box; 20, plugging agent extrusion mechanism; 30, extrusion pipe; 40, annular flow guide shell; 11, cylindrical shell; 12, bottom cover; 13, upper cover; 14, flange ring; 15, plugging agent input pipe; 151, flow guide pipe; 152, flow guide disc; 153, one-way valve; 16, oil and gas guide pipe; 21, hydraulic cylinder; 22, hydraulic push rod; 23, annular extrusion plate; 31, connecting head; 32, elastic pipe body; 33, hard pipe body; 41, outer sleeve ring; 42, upper annular drainage belt; 43, lower annular drainage belt; DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] As Figure 1 , Figure 2 and Figure 4To achieve the above object, the oil-water well composite cross-linking plugging agent injection device of the utility model technical scheme comprises a cross-linking plugging agent storage box 10, a plugging agent extrusion mechanism 20, a plurality of extrusion pipes 30 and an annular flow guide shell 40. The upper end of the cross-linking plugging agent storage box 10 is provided with a cross-linking plugging agent input pipe 15, and a plurality of plugging agent extrusion openings are uniformly arranged on the side wall of the cross-linking plugging agent storage box 10. The cross-linking plugging agent input pipe 15 is used to be connected with a plugging agent conveying source at the upper part of the oil well. The cross-linking plugging agent storage box 10 is used to store the cross-linking plugging agent conveyed by the plugging agent conveying source. The plugging agent extrusion mechanism 20 is arranged at the upper end of the cross-linking plugging agent storage box 10 and is used to extrude the cross-linking plugging agent in the cross-linking plugging agent storage box 10 through the plurality of plugging agent extrusion openings at a preset pressure. The plurality of extrusion pipes 30 are correspondingly arranged on the plurality of plugging agent extrusion openings and respectively extend along the horizontal direction. The annular flow guide shell 40 is arranged on the side wall of the cross-linking plugging agent storage box 10 in the circumferential direction. The front end of the cross-linking plugging agent input pipe 15 is provided with a flange ring 14. The extrusion openings of the plurality of extrusion pipes 30 extend to the outside of the annular flow guide shell 40 through the annular flow guide shell 40. The plurality of extrusion pipes 30 are used to uniformly spray the cross-linking plugging agent in the cross-linking plugging agent storage box 10 to the preset position of the well wall along the circumferential direction of the oil well. The cross-linking plugging agent is pumped into the cross-linking plugging agent input pipe 15 connected with the flange ring 14 by a plunger pump, and the cross-linking plugging agent input pipe 15 guides the cross-linking plugging agent into the cross-linking plugging agent storage box 10. When the oil well is lowered, a plurality of oil and gas conduits 16 are connected with the bottom cover 12 and the upper cover 13, so as to guide the oil and gas at the lower side of the device to the upper side of the device. After the lowering is completed, a plurality of hydraulic push rods 22 in a plurality of hydraulic cylinders 21 of the plugging agent extrusion mechanism 20 move downward, push the annular extrusion plate 23 to apply pressure to the cross-linking plugging agent in the cross-linking plugging agent storage box 10. A plurality of plugging agent extrusion openings are uniformly arranged on the side wall of the cross-linking plugging agent storage box 10, the plurality of plugging agent extrusion openings are connected with the connecting heads 31 of the plurality of extrusion pipes 30, the hard pipe bodies 33 of the plurality of extrusion pipes 30 extend to the outside of the annular flow guide shell 40, the plugging agent extrusion mechanism 20 applies pressure, and the cross-linking plugging agent in the cross-linking plugging agent storage box 10 is uniformly sprayed to the preset position of the well wall along the circumferential direction of the oil well through the plurality of extrusion pipes 30. During the spraying process, the plurality of extrusion pipes 30 are located between the upper annular flow guide belt 42 and the lower annular flow guide belt 43, the upper annular flow guide belt 42 and the lower annular flow guide belt 43 are attached to the well wall of the oil well, and the influence of the upward flowing high-pressure oil and gas on the sprayed cross-linking plugging agent is protected. The injection device is not easily affected by the upward flowing high-pressure oil and gas during the working process of lowering the oil well and spraying the cross-linking plugging agent, the sprayed cross-linking plugging agent will not be blown upward to other positions on the upper side, the injection effect is poor during the spraying process, the cross-linking plugging agent is out of control, leakage is caused, pollution is caused, the effect of injecting the cross-linking plugging agent to the target layer (such as a water layer or a high-permeability layer) of the well wall of the oil well is better.

[0025] In specific implementation, for example, Figure 1 、 Figure 2and Figure 3 As shown in the drawings, the upper end of the cross-linking blocking agent storage tank 10 has a cross-linking blocking agent input pipe 15, and a plurality of blocking agent extrusion openings are evenly arranged on the side wall of the cross-linking blocking agent storage tank 10. The cross-linking blocking agent input pipe 15 is used to connect with the blocking agent delivery source at the upper part of the oil well; the cross-linking blocking agent storage tank 10 is used to store the cross-linking blocking agent delivered by the blocking agent delivery source; the blocking agent extrusion mechanism 20 is arranged at the upper end of the cross-linking blocking agent storage tank 10, and the blocking agent extrusion mechanism 20 is used to extrude the cross-linking blocking agent in the cross-linking blocking agent storage tank 10 through the plurality of blocking agent extrusion openings at a preset pressure; a plurality of extrusion pipes 30 are correspondingly installed on the plurality of blocking agent extrusion openings and respectively extend in the horizontal direction; the annular flow guide shell 40 is sleeved on the side wall of the cross-linking blocking agent storage tank 10 in the circumferential direction; wherein the front end of the cross-linking blocking agent input pipe 15 is provided with a flange ring 14; the extrusion openings of the plurality of extrusion pipes 30 extend to the outside of the annular flow guide shell 40 through the annular flow guide shell 40; the plurality of extrusion pipes 30 are used to uniformly spray the cross-linking blocking agent in the cross-linking blocking agent storage tank 10 to the preset position of the well wall in the circumferential direction of the oil well.

[0026] Further, the cross-linking blocking agent storage tank 10 comprises a cylindrical shell 11, a bottom cover 12, and an upper cover 13; the inside of the cylindrical shell 11 forms a blocking agent storage cavity for storing cross-linking blocking agent; the bottom cover 12 is detachably installed on the lower port of the cylindrical shell 11; the upper cover 13 is detachably installed on the upper port of the cylindrical shell 11; wherein a plurality of blocking agent extrusion openings are evenly arranged on the side wall of the cylindrical shell 11 in the circumferential direction of the cylindrical shell 11; the cross-linking blocking agent input pipe 15 is installed on the upper cover 13 in the vertical direction and extends into the blocking agent storage cavity to deliver the cross-linking blocking agent from the blocking agent delivery source into the blocking agent storage cavity; the blocking agent extrusion mechanism 20 is installed on the upper cover 13 and extends into the blocking agent storage cavity to extrude the cross-linking blocking agent in the blocking agent storage cavity to the plurality of blocking agent extrusion openings in the vertical direction. The cross-linking blocking agent storage tank 10 temporarily stores the cross-linking blocking agent, ensuring that the device will not run short of supply during operation, and the blocking agent extrusion mechanism 20 provides additional pressure for the entire device, improving the working efficiency of the device.

[0027] In order to prevent the cross-linking blocking agent from leaking in the cross-linking blocking agent storage tank 10, the size of the upper cover 13 is slightly larger than the inner diameter of the cylindrical shell 11, the bottom surface of the upper cover 13 is seamlessly connected with the upper port of the cylindrical shell 11, the size of the bottom cover 12 is slightly larger than the inner diameter of the cylindrical shell 11, and the bottom surface of the bottom cover 12 is seamlessly connected with the lower port of the cylindrical shell 11. The cylindrical shell 11, the upper cover 13, and the bottom cover 12 form a sealed space. The flange ring 14 is connected with the delivery pipe of the external blocking agent delivery source, so that the cross-linking blocking agent can smoothly flow from the cross-linking blocking agent input pipe 15 into the space formed by the cylindrical shell 11, the upper cover 13, and the bottom cover 12, and the connection between the cross-linking blocking agent input pipe 15 and the flange ring 14 and the cylindrical shell 11 ensures liquid-tight transmission without leakage.

[0028] Further, the cross-linking blocking agent input pipe 15 comprises a flow guide pipe 151, a flow guide disc 152, and a one-way valve 153. The flow guide pipe 151 is installed on the upper cover 13 in the vertical direction and extends into the blocking agent storage cavity. The upper end of the flow guide pipe 151 is connected with the blocking agent delivery source. The flow guide disc 152 is arranged at the lower end of the flow guide pipe 151 and is fixedly connected with the bottom cover 12. A plurality of flow guide holes are uniformly and spaced apart arranged along the circumferential direction of the flow guide disc 152. The plurality of one-way valves 153 are correspondingly arranged in the plurality of flow guide holes. The plurality of one-way valves 153 are used to unidirectionally deliver the cross-linking blocking agent through the flow guide pipe 151 and the flow guide disc 152 into the blocking agent storage cavity. Through the cooperation of the flow guide pipe 151 and the flow guide disc 152, the cross-linking blocking agent can be directly delivered into the cross-linking blocking agent storage box 10. Moreover, when the blocking agent extrusion mechanism 20 provides additional pressure, the plurality of one-way valves 153 on the flow guide disc 152 ensure that the cross-linking blocking agent does not flow backward in the cross-linking blocking agent storage box 10, so that the external cross-linking blocking agent continuously enters the cross-linking blocking agent box.

[0029] In order to prevent the cross-linking blocking agent from flowing backward when it unidirectionally flows into the cross-linking blocking agent storage box 10, further, Figure 3 The cross-linking blocking agent input pipe 15 is composed of two parts, including the flow guide pipe 151 and the flow guide disc 152. The flow guide disc 152 is a hollow cylindrical structure, a through hole is arranged at the center of rotation and is seamlessly connected with the flow guide pipe 151. A plurality of jet holes are arranged at equal angles along the circumferential direction. A one-way valve is arranged in each jet hole to ensure that the cross-linking blocking agent unidirectionally flows from the cross-linking blocking agent input pipe 15 into the cross-linking blocking agent storage box 10. The bottom side of the flow guide disc is tightly attached to the bottom cover 12. The flow guide pipe 151 is a hollow cylindrical structure, and the diameter of the flow guide pipe 151 is smaller than the diameter of the flow guide disc 152. The connection between the flow guide pipe 151 and the flow guide disc 152 forms a stepped circular truncated cone, which limits the movement of the blocking agent extrusion mechanism 20 in the vertical direction to the lowest position, ensuring that the one-way valves 153 are not affected.

[0030] Further, the blocking agent extrusion mechanism 20 comprises a plurality of hydraulic cylinders 21, a plurality of hydraulic push rods 22, and an annular extrusion plate 23. The plurality of hydraulic cylinders 21 are detachably installed on the reserved through holes of the upper cover 13 in the vertical direction. The plurality of hydraulic push rods 22 are telescopically and correspondingly installed in the plurality of hydraulic cylinders 21. The annular extrusion plate 23 is movably arranged in the blocking agent storage cavity in the vertical direction. The upper end surface of the annular extrusion plate 23 is fixedly connected with the lower end of the plurality of hydraulic push rods 22. The inner ring edge of the annular extrusion plate 23 is slidably sleeved on the outer side wall of the cross-linking blocking agent input pipe 15. The outer ring edge of the annular extrusion plate 23 is slidably abutted with the inner side wall of the blocking agent storage cavity. The annular extrusion plate 23 is used to extrude the cross-linking blocking agent in the blocking agent storage cavity through the plurality of blocking agent extrusion ports at a predetermined pressure under the driving of the plurality of hydraulic push rods 22. The limit position of the downward movement of the annular extrusion plate 23 is higher than the installation position of the one-way valve 153. The cross-linking blocking agent in the cross-linking blocking agent storage box 10 can be uniformly extruded through the plurality of blocking agent extrusion ports, ensuring the continuity of the cross-linking blocking agent and preventing the occurrence of flow interruption and other situations.

[0031] Further, the cross-linking plugging agent storage box 10 further comprises a plurality of oil and gas conduits 16, the upper ports of the plurality of oil and gas conduits 16 extend to the upper space of the cross-linking plugging agent storage box 10 through the upper cover 13, and the lower ports extend to the lower space of the cross-linking plugging agent storage box 10 through the bottom cover 12; the plurality of oil and gas conduits 16 are uniformly and equidistantly arranged along the circumference of the cylindrical shell 11. During the entire device lowering process, the oil and gas on the lower side of the device can flow to the upper side of the device through the plurality of oil and gas conduits 16, thereby reducing the resistance of the device during the lowering process.

[0032] Further, the plurality of extrusion pipes 30 are equiangularly and uniformly distributed along the circumference of the cross-linking plugging agent storage box 10, and the plurality of extrusion pipes 30 can uniformly and equidistantly spray the cross-linking plugging agent onto the well wall.

[0033] Further, the plurality of extrusion pipes 30 comprise a connecting head 31, an elastic pipe body 32, and a hard pipe body 33; the connecting head 31 is detachably installed on the plugging agent extrusion port; the first end of the elastic pipe body 32 is fixedly connected with the connecting head 31; the first end of the hard pipe body 33 is fixedly connected with the second end of the elastic pipe body 32; wherein the annular flow guide shell 40 is provided with a plurality of telescopic holes along the circumference, and the hard pipe bodies 33 of the plurality of extrusion pipes 30 are correspondingly and telescopically installed in the plurality of telescopic holes, and the diameters of the telescopic holes are all less than 5 mm. This can enable the cross-linking plugging agent to be accurately sprayed onto the gaps of the well wall.

[0034] Further, as shown in Figure 5 and Figure 6 , the annular flow guide shell 40 comprises a sleeve ring 41, an upper annular flow guide belt 42, and a lower annular flow guide belt 43; the upper annular flow guide belt 42 is installed on the sidewall of the sleeve ring 41 along the circumference of the sleeve ring 41; the lower annular flow guide belt 43 is installed on the sidewall of the sleeve ring 41 along the circumference of the sleeve ring 41; wherein the plurality of extrusion pipes 30 are located between the upper annular flow guide belt 42 and the lower annular flow guide belt 43; the upper annular flow guide belt 42 and the lower annular flow guide belt 43 are used to guide the oil and gas that upwardly flows from the lower side. The upper annular flow guide belt 42 and the lower annular flow guide belt 43 are in contact with the well wall during work, thereby protecting the sprayed cross-linking plugging agent from being affected by the pressure of the oil and gas from the lower side.

[0035] In order to reduce the friction between the device and the well wall during the lowering process, the material of the annular flow guide shell 40 is rubber, and the annular flow guide shell 40 can elastically contract when lowering the well.

[0036] In use, the flange ring 14 is connected to the blocking agent delivery source on the upper part of the oil well, the injection device is inserted into the wellhead of the oil well, and the device is lowered. Since the maximum outer diameter of the sleeve ring 41 can be designed to contact the oil wall, when the injection device is inserted into the oil well, the outer opening of each hard tube body 33 can stably contact the inner wall of the oil well, and the upper and lower annular drainage belts 42 and 43 are in contact with the well wall during operation, protecting the injected cross-linked blocking agent from the influence of the lower oil and gas pressure. The sleeve ring 41 is compressible, and during downward pressure, the sleeve ring 41 is in contact with the oil wall, and the elastic tube 32 can be retracted to reduce the frictional resistance with the oil well wall. The bottom cover 12 and the upper cover 13 are both annularly and uniformly provided with four through holes, and the inner corresponding ports of the corresponding two through holes are connected to the upper and lower openings of an oil and gas conduit 16 without seams, so that the upper and lower through holes are connected to each other, which can be used to guide the high-pressure oil and gas upward from the lower side when the injection device is inserted into the oil well, greatly reducing the resistance of the injection device. During operation, the plunger pump operates to suck the cross-linked blocking agent and then discharge it into the cross-linked blocking agent storage tank 10. Then, the blocking agent extrusion mechanism 20 works, the plurality of hydraulic push rods 22 in the plurality of hydraulic cylinders 21 move downward, push the annular extrusion plate 23 to move, and the outer ring edge of the annular extrusion plate 23 slides on the inner side wall of the blocking agent storage cavity, extruding the cross-linked blocking agent in the cross-linked blocking agent storage tank 10. The cross-linked blocking agent enters the plurality of extrusion tubes 30 through the plurality of blocking agent extrusion ports in the cross-linked blocking agent storage tank 10. Finally, the cross-linked blocking agent is high-pressure injected from the hard tube body 33 in each of the plurality of telescopic holes in contact with the oil well wall to the target layer (such as the water layer or the high-permeability layer) of the oil well wall.

[0037] The preferred embodiments of the present application are only used to limit the present application, and the present application can be variously changed and modified for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An injection device for composite crosslinking plugging agent of oil-water well, characterized in that, The application relates to a cross-linking plugging agent storage tank (10) which has a cross-linking plugging agent input pipe (15) at the upper end, a plurality of plugging agent extrusion openings are uniformly arranged on the side wall of the cross-linking plugging agent storage tank (10), the cross-linking plugging agent input pipe (15) is used for being connected with a plugging agent conveying source at the upper part of an oil well; the cross-linking plugging agent storage tank (10) is used for storing cross-linking plugging agents conveyed by the plugging agent conveying source; a plugging agent extrusion mechanism (20) is arranged at the upper end of the cross-linking plugging agent storage tank (10), the plugging agent extrusion mechanism (20) is used for extruding the cross-linking plugging agents in the cross-linking plugging agent storage tank (10) out through the plurality of plugging agent extrusion openings at a preset pressure; a plurality of extrusion pipes (30) are correspondingly arranged on the plurality of plugging agent extrusion openings and respectively extend along the horizontal direction; and an annular flow guide shell (40) is arranged on the side wall of the cross-linking plugging agent storage tank (10) in a sleeving mode. The front end of the cross-linking plugging agent input pipe (15) is provided with a flange ring (14); the liquid extrusion openings of the plurality of extrusion pipes (30) extend to the outside of the annular flow guide shell (40) through the annular flow guide shell (40); and the plurality of extrusion pipes (30) are used for uniformly spraying the cross-linking plugging agents in the cross-linking plugging agent storage tank (10) to the preset positions of the well wall along the circumferential direction of the oil well. The cross-linking plugging agent storage tank (10) comprises a cylindrical shell (11), a bottom cover (12) which is detachably arranged on the lower end of the cylindrical shell (11), and an upper cover (13) which is detachably arranged on the upper end of the cylindrical shell (11). The plurality of plugging agent extrusion openings are uniformly arranged on the side wall of the cylindrical shell (11) along the circumferential direction of the cylindrical shell (11); the cross-linking plugging agent input pipe (15) is arranged on the upper cover (13) along the vertical direction and extends into the plugging agent storage cavity to convey the cross-linking plugging agents from the plugging agent conveying source into the plugging agent storage cavity; and the plugging agent extrusion mechanism (20) is arranged on the upper cover (13) and extends into the plugging agent storage cavity to extrude the cross-linking plugging agents in the plugging agent storage cavity to the plurality of plugging agent extrusion openings along the vertical direction. The cross-linking plugging agent input pipe (15) comprises a flow guide pipe (151) which is arranged on the upper cover (13) along the vertical direction and extends into the plugging agent storage cavity, a flow guide disc (152) which is arranged at the lower end of the flow guide pipe (151) and is fixedly connected with the bottom cover (12), a plurality of flow guide holes which are uniformly and spacedly arranged on the flow guide disc (152) along the circumferential direction of the flow guide disc (152), and a plurality of one-way valves (153) which are correspondingly arranged on the plurality of flow guide holes. The plurality of one-way valves (153) are used for unidirectionally conveying the cross-linking plugging agents through the flow guide pipe (151) and the flow guide disc (152) into the plugging agent storage cavity. The plugging agent extrusion mechanism (20) comprises 2. The injection device of claim 1, wherein the device is a composite crosslinked plugging agent for oil and water wells. ​ ​ ​ ​ ​ 3. The injection device of claim 2, wherein the device is a composite crosslinked plugging agent injection device for oil and water wells. ​ ​ ​ ​ ​ 4. The injection device of claim 3, wherein the device is a composite crosslinked plugging agent injection device for oil and water wells. ​ A plurality of hydraulic cylinders (21) are detachably mounted on the through holes reserved on the upper cover (13) in the vertical direction; A plurality of hydraulic push rods (22) are correspondingly mounted in the plurality of hydraulic cylinders (21) in the vertical direction; An annular extrusion plate (23) is movably arranged in the storage cavity in the vertical direction; The upper end surface of the annular extrusion plate (23) is fixedly connected with the lower end of the plurality of hydraulic push rods (22), the inner ring edge of the annular extrusion plate (23) is slidably sleeved on the outer sidewall of the cross-linking blocking agent input pipe (15), and the outer ring edge of the annular extrusion plate (23) is slidably abutted with the inner sidewall of the blocking agent storage cavity; the annular extrusion plate (23) is used for extruding the cross-linking blocking agent in the blocking agent storage cavity at a preset pressure through the plurality of blocking agent extrusion ports under the driving of the plurality of hydraulic push rods (22); the limit position of the downward movement of the annular extrusion plate (23) is higher than the mounting position of the one-way valve (153).

5. The injection device of claim 2, wherein the device is a composite crosslinked plugging agent injection device for oil and water wells. The cross-linking blocking agent storage box (10) further comprises: A plurality of oil and gas conduits (16) whose upper ports extend to the upper space of the cross-linking blocking agent storage box (10) through the upper cover (13) and whose lower ports extend to the lower space of the cross-linking blocking agent storage box (10) through the bottom cover (12); The plurality of oil and gas conduits (16) are uniformly and circumferentially arranged along the cylindrical shell (11).

6. The injection device of claim 1, wherein the device is a composite crosslinked plugging agent injection device for oil and water wells. The plurality of extrusion pipes (30) are uniformly and equiangularly distributed along the circumference of the cross-linking blocking agent storage box (10).

7. The injection device of claim 1, wherein the device is a composite crosslinked plugging agent injection device for oil and water wells. The extrusion pipe (30) comprises: A connecting head (31) which is detachably mounted on the blocking agent extrusion port; An elastic pipe body (32) whose first end is fixedly connected with the connecting head (31); A hard pipe body (33) whose first end is fixedly connected with the second end of the elastic pipe body (32); The annular flow guide shell (40) comprises:

8. The injection device of claim 1, wherein the device is a composite crosslinked plugging agent injection device for oil and water wells. An outer sleeve ring (41); An upper annular drainage belt (42) which is arranged on the sidewall of the outer sleeve ring (41) in the circumferential direction of the outer sleeve ring (41); A lower annular drainage belt (43) which is arranged on the sidewall of the outer sleeve ring (41) in the circumferential direction of the outer sleeve ring (41); The plurality of extrusion pipes (30) are located between the upper annular drainage belt (42) and the lower annular drainage belt (43); the upper annular drainage belt (42) and the lower annular drainage belt (43) are used for guiding the upward flow of oil and gas. ​

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