An intelligent injection device for a fracturing tracer of an oil and gas well

Abstract

The utility model discloses an oil and gas well fracturing tracer intelligent injection device, including base, movable seat, lifting device, butt joint pipeline, swivel, conveying pipeline, piston and hydraulic cylinder, lifting device sets up on the base for driving movable seat to go up and down, swivel sets up on movable seat, butt joint pipeline sets up in the rotating end of swivel, conveying pipeline sets up in the fixed end of swivel, hydraulic cylinder sets up on movable seat, piston sets up in the hydraulic rod bottom end of hydraulic cylinder, and with conveying pipeline sliding connection, and injection line and pressure sensor are respectively communicated on conveying pipeline, the utility model discloses through setting injection line feeding, cooperate hydraulic cylinder and piston as pressure increasing mechanism, the pressure in conveying pipeline is monitored in real time with pressure sensor, solve the problem that the external feeding device in the prior art is hindered by the soil layer and leads to the dramatic increase of load and the long -term overload operation causes equipment wear and tear, maintenance cost increases, construction stagnation.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well development technology, and in particular to an intelligent injection device for oil and gas well fracturing tracers. Background Technology

[0002] In oil and gas well fracturing operations, tracer injection is a crucial step in monitoring fracturing effectiveness, determining fracture extension range, and assessing reservoir stimulation efficacy. The tracer must be precisely and stably delivered to the wellhead using a specialized injection device, mixed with the fracturing fluid, and injected into the reservoir. Subsequent monitoring of tracer concentration changes in the flowback fluid allows for accurate analysis of fracturing parameters, providing data support for optimizing oil and gas well productivity.

[0003] Existing tracer injection devices typically use gear pumps for injection. However, during actual injection, factors such as differences in the underlying soil structure of oil and gas wells and fracturing fluid backflow can cause the tracer to be obstructed by the soil layer, hindering its smooth flow. Since existing devices rely on gear pumps for injection power, continuously starting the gear pump to attempt to propel the tracer will cause a sharp increase in the pump load. This not only fails to effectively overcome soil obstacles and resolve the tracer flow stagnation problem but also leads to injection interruptions and insufficient injection volume. Prolonged overload operation will directly cause wear and damage to the gear pump, increasing equipment maintenance costs and downtime, severely impacting fracturing progress and tracer injection effectiveness. Furthermore, different oil and gas wells have varying wellhead installation heights and interface orientations, while the existing injection devices have fixed docking pipe heights and angles, making flexible adjustment based on actual wellhead parameters difficult. This results in slow and accurate docking of the docking pipe with the wellhead interface, requiring multiple operators to coordinate and adjust the overall equipment position. This is not only time-consuming and labor-intensive but also prone to gaps due to docking deviations, causing tracer leakage, wasting material resources, and posing construction safety hazards. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an intelligent injection device for fracturing tracers in oil and gas wells, thereby solving the problems mentioned in the background section. To achieve the above objective, this invention adopts the following technical solution: This intelligent injection device for fracturing tracers in oil and gas wells includes a base, a movable seat, a lifting device, a docking pipe, a rotary joint, a delivery pipe, a piston, and a hydraulic cylinder. The lifting device is mounted on the base and includes a support frame and a first lead screw and a second lead screw vertically rotatably mounted within the support frame. The movable seat is threadedly connected to the first and second lead screws. The rotary joint includes a rotating end and a fixed end that can rotate relative to each other. The fixed end of the rotary joint is mounted on the movable seat. The docking pipe is located at the rotating end of the rotary joint, and the delivery pipe is connected to the fixed end of the rotary joint. The hydraulic cylinder includes a cylinder body and a hydraulic rod. The cylinder body is located at the top of the movable seat, and the hydraulic rod is slidably mounted at the bottom end of the cylinder body. The piston is located at the bottom end of the hydraulic rod and slidably connected to the inner wall of the delivery pipe. An injection line and a pressure sensor are connected to the delivery pipe.

[0005] Optionally, the lifting device further includes a first driving device, which is disposed on the base and is used to simultaneously drive the first lead screw and the second lead screw to rotate.

[0006] Optionally, the first driving device includes a first sprocket, a second sprocket, a third sprocket, a rotating shaft, a first synchronous pulley, a second synchronous pulley, and a first motor. The first sprocket is mounted on the first lead screw, the second sprocket is mounted on the second lead screw, the rotating shaft is rotatably mounted on the base, the third sprocket and the first synchronous pulley are respectively mounted at both ends of the rotating shaft, the first motor is mounted on the base, the second synchronous pulley is mounted on the output shaft of the first motor, the first synchronous pulley and the second synchronous pulley are connected by a synchronous belt, and the first sprocket, the second sprocket, and the third sprocket are connected by a chain.

[0007] Optionally, it also includes a rotary drive device, which is disposed on the base and is used to drive the docking pipe to rotate.

[0008] Optionally, the rotary drive device includes a first gear, a second gear, and a reduction motor. The first gear is disposed on the docking pipe, the second gear is rotatably disposed on the base and meshes with the first gear, and the reduction motor is disposed on the base for driving the second gear to rotate.

[0009] Optionally, it also includes a wellhead connector, which is detachably disposed at the end of the connecting pipe away from the rotary joint.

[0010] Optionally, a solenoid valve is provided on the injection line.

[0011] Optionally, the support frame has a clearance groove on the side away from the base corresponding to the hydraulic cylinder.

[0012] Compared to existing technologies, the advantages of this invention are that, by adopting the above-mentioned solution, the present invention solves the problems of external material supply devices being obstructed by soil layers, leading to a sharp increase in load, injection interruption, insufficient injection volume, and long-term overload operation causing equipment wear, increased maintenance costs, and construction stagnation. Furthermore, by setting up an injection pipe with first and second lead screws to drive the movable seat to rise and fall, the height of the docking pipe can be adjusted. A rotary joint allows the docking pipe and the delivery pipe to rotate relative to each other, achieving height adjustment and automatic docking of the docking pipe and the wellhead interface. This solves the problems of fixed docking pipe parameters, inability to adapt to different wellhead installation heights, time-consuming and labor-intensive docking, large docking deviations, tracer leakage, and safety hazards associated with existing injection devices. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall front structure of this utility model; Figure 2 This is a schematic diagram of the overall rear structure of this utility model; Figure 3 This is a schematic diagram of the lifting device and the first driving device of this utility model. Figure 4 This is a schematic diagram of the rotary drive device of this utility model; Explanation of reference numerals in the attached drawings: 1. Base; 2. Movable seat; 3. Lifting device; 4. Connecting pipe; 5. Rotary joint; 6. Conveying pipe; 7. Piston; 8. Hydraulic cylinder; 9. Injection pipe; 10. Pressure sensor; 31. Support frame; 32. First lead screw; 33. Second lead screw; 34. First drive device; 341. First sprocket; 342. Second sprocket; 343. Third sprocket; 345. Rotating shaft; 346. First synchronous pulley; 347. Second synchronous pulley; 348. First motor; 11. Rotary drive device; 111. First gear; 112. Second gear; 113. Connecting shaft; 114. Third synchronous pulley; 115. Fourth synchronous pulley; 116. Gearbox; 12. Wellhead connector; 13. Solenoid valve; 311. Clearance groove. Detailed Implementation

[0014] To facilitate understanding of this application, a more detailed description of the application is provided below with reference to the accompanying drawings and specific embodiments; preferred embodiments of the application are shown in the drawings; however, the application may be implemented in many different forms and is not limited to the embodiments described in this specification; rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this application.

[0015] It should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and back) are used to explain the structure and movement of various components and are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0016] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; it should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0017] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0018] like Figures 1-3 As shown, one embodiment of this utility model is an intelligent injection device for oil and gas well fracturing tracers, comprising a base 1, a movable seat 2, a lifting device 3, a docking pipe 4, a rotary joint 5, a delivery pipe 6, a piston 7, and a hydraulic cylinder 8. The lifting device 3 is mounted on the base 1 and includes a support frame 31 and a first lead screw 32 and a second lead screw 33 vertically mounted within the support frame 31. The support frame 31 is mounted on the base 1. The movable seat 2 is threadedly connected to the first lead screw 32 and the second lead screw 33 respectively. The rotary joint 5 is mounted on the movable seat 2. The docking pipe 4 is mounted on the rotating end of the rotary joint 5. The delivery pipe 6 is connected to the fixed end of the rotary joint 5. The hydraulic cylinder 8 includes a cylinder body and a hydraulic rod. The cylinder body is mounted on the top of the movable seat 2. The hydraulic rod is slidably mounted within the cylinder body and extends out of the bottom end of the cylinder body. The piston 7 is mounted on the bottom end of the hydraulic rod and slidably connected to the delivery pipe 6. The delivery pipe 6 is connected to an injection pipe 9 and a pressure sensor 10 respectively. The injection pipe 9 is connected to an external tracer supply device.

[0019] In this embodiment, the base 1 is horizontally arranged, and the support frame 31 is vertically arranged on the top surface of the base 1. The first lead screw 32 and the second lead screw 33 are respectively vertically rotatably arranged on the left and right sides inside the support frame 31 through bearings. The two ends of the movable seat 2 are respectively provided with threaded holes that are adapted to the first lead screw 32 and the second lead screw 33. The movable seat 2 is threadedly connected to the first lead screw 32 and the second lead screw 33 through the two threaded holes respectively. When the first lead screw 32 and the second lead screw 33 rotate, they can drive the movable seat 2 to rise and fall in the vertical direction. Rotary joint 5 is installed through and fixedly disposed in the middle of movable seat 2. Rotary joint 5 is a component connecting dynamic and static pipelines, including a rotating end and a fixed end that can rotate relative to each other around an axis. The internal flow channels of the rotating end and the fixed end are interconnected. The fixed end of rotary joint 5 is fixedly connected to movable seat 2 through a flange. The top end of docking pipe 4 is connected to the rotating end of rotary joint 5. Docking pipe 4 can rotate with the rotating end of rotary joint 5 to achieve docking with wellhead interface. The bottom end of delivery pipe 6 is connected to the fixed end of rotary joint 5 and is connected to docking pipe 4 through the internal flow channel of rotary joint 5. Hydraulic cylinder 8 includes cylinder body and hydraulic rod. The cylinder body is vertically disposed on the top of movable seat 2 and located above rotary joint 5. The hydraulic rod is vertically slidably disposed in cylinder body and extends downward to the bottom end of cylinder body. The axis of hydraulic cylinder 8 is collinear with the axis of delivery pipe 6. The top end of piston 7 is fixedly connected to the bottom end of hydraulic rod. The bottom end of piston 7 extends into delivery pipe 6 and is slidably and sealingly connected with the inner wall of delivery pipe 6 to ensure that tracer does not leak during piston 7 sliding.

[0020] The bottom end of the conveying pipe 6 is connected to an injection pipe 9, which is used to connect to an external tracer supply device. The external supply device can use a gear pump to achieve continuous tracer supply. A pressure sensor 10 is also fixedly installed on the pipe wall of the conveying pipe 6. The detection end of the pressure sensor 10 extends into the inside of the conveying pipe 6 to detect the tracer pressure in the conveying pipe 6 in real time.

[0021] Before construction, according to the installation height of the oil and gas wellhead, the lifting device 3 is activated, which drives the movable seat 2 to rise and fall vertically. Since the fixed end of the rotary joint 5 is fixedly set in the middle of the movable seat 2 through a flange, and the docking pipe 4 is fixedly connected to the rotating end of the rotary joint 5, when the movable seat 2 rises and falls, the rotary joint 5 drives the docking pipe 4 to rise and fall synchronously, thereby adjusting the height of the docking pipe 4 until it matches the wellhead interface. Then, by rotating the rotary joint 5, the docking pipe 4 is connected to the wellhead interface. After the connection is completed, the external tracer supply device is activated, and the external supply device continuously supplies tracer into the delivery pipe 6 through the injection pipe 9. The tracer is injected into the wellhead of the oil and gas well via delivery pipeline 6 and docking pipeline 4. After mixing with fracturing fluid, it is injected into the reservoir together. Pressure sensor 10 monitors the tracer pressure in delivery pipeline 6 in real time and feeds the pressure data back to the control terminal. When a sudden increase in pressure is detected, the control terminal shuts off the external tracer supply device and starts hydraulic cylinder 8. The hydraulic rod of hydraulic cylinder 8 drives piston 7 to move downward along the inner wall of delivery pipeline 6 to pressurize the tracer in delivery pipeline 6, so that the tracer can break through the soil layer. After the pressurization is completed, the control terminal restores the normal supply of the external supply device, and hydraulic cylinder 8 resets to ensure continuous and stable injection of tracer.

[0022] This application solves the problems in the prior art where external material supply devices are obstructed by soil layers, leading to a sharp increase in load, injection interruption, insufficient injection volume, and long-term overload operation causing equipment wear, increased maintenance costs, and construction stagnation. By setting up an injection pipeline 9 for material supply, and using a hydraulic cylinder 8 and piston 7 as a pressurizing mechanism, combined with a pressure sensor 10 to monitor the pressure inside the delivery pipeline 6 in real time, this application solves the problems of the prior art where external material supply devices are obstructed by soil layers, resulting in a sharp increase in load, injection interruption, insufficient injection volume, and long-term overload operation causing equipment wear, increased maintenance costs, and construction stagnation. By setting up a lifting device 3 with a first lead screw 32 and a second lead screw 33 to adjust the height of the docking pipeline 4, and using a rotary joint 5 to allow the docking pipeline 4 and delivery pipeline 6 to rotate relative to each other, this application realizes the height adjustment and automatic docking of the docking pipeline 4 and the wellhead interface. This solves the problems of the prior art where the docking pipeline 4 has fixed parameters, cannot be adapted to different wellhead installation heights, and docking is time-consuming and laborious, has large docking deviations, tracer leakage, and safety hazards.

[0023] In one embodiment, such as Figure 3 As shown, the lifting device 3 also includes a first driving device 34, which is fixedly installed on the base 1 and located on the rear side of the support frame 31. It is used to simultaneously drive the first lead screw 32 and the second lead screw 33 to rotate synchronously, thereby driving the movable seat 2 to rise or fall.

[0024] When it is necessary to adjust the height of the docking pipe 4, the first drive device 34 is activated. The first drive device 34 simultaneously drives the first lead screw 32 and the second lead screw 33 to rotate, thereby driving the movable seat 2 to move vertically. The movable seat 2 drives the docking pipe 4 to rise and fall synchronously through the rotary joint 5 until the height of the docking pipe 4 matches the height of the wellhead interface.

[0025] In one embodiment, such as Figure 3 As shown, the first drive device 34 includes a first sprocket 341, a second sprocket 342, a third sprocket 343, a rotating shaft 345, a first synchronous pulley 346, a second synchronous pulley 347, and a first motor 348. The first sprocket 341 is located at the bottom of the first lead screw 32, the second sprocket 342 is located at the bottom of the second lead screw 33, the rotating shaft 345 is vertically rotatably mounted on the base 1, the third sprocket 343 is located at the top of the rotating shaft 345, the first synchronous pulley 346 is located at the bottom of the rotating shaft 345, the first motor 348 is mounted on the base 1, the second synchronous pulley 347 is mounted on the output shaft of the first motor 348, the first synchronous pulley 346 and the second synchronous pulley 347 are connected by a synchronous belt, and the first sprocket 341, the second sprocket 342 and the third sprocket 343 are connected by a chain.

[0026] During operation, the output shaft of the first motor 348 drives the second synchronous pulley 347 to rotate. The second synchronous pulley 347 drives the first synchronous pulley 346 to rotate synchronously via a synchronous belt. The first synchronous pulley 346 drives the rotating shaft 345 to rotate around its own axis. The other end of the rotating shaft 345 drives the third sprocket 343 to rotate synchronously. The third sprocket 343 drives the first sprocket 341 and the second sprocket 342 to rotate synchronously via a chain. Since the first sprocket 341 is fixed on the first lead screw 32 and the second sprocket 342 is fixed on the second lead screw 33, the first lead screw 32 and the second lead screw 33 rotate synchronously and at the same speed around their own axes with the first sprocket 341 and the second sprocket 342, thereby driving the movable seat 2 to rise and fall vertically along the lead screw, realizing the adjustment of the height of the docking pipe 4.

[0027] In one embodiment, such as Figure 2 As shown, it also includes a rotary drive device 11, which is mounted on the base 1 and is used to drive the docking pipe 4 to rotate.

[0028] The rotary drive device 11 is fixedly installed at the bottom of the base 1 and located on one side of the lifting device 3. The rotary drive device 11 is used to drive the docking pipe 4 to rotate for docking with the wellhead.

[0029] In one embodiment, such as Figure 4 As shown, the rotary drive device 11 includes a first gear 111, a second gear 112, a connecting shaft 113, a third synchronous pulley 114, a fourth synchronous pulley 115, and a reduction motor 116. The first gear 111 is mounted on the docking pipe 4. The connecting shaft 113 is vertically inserted and rotatably mounted on the base 1. The second gear 112 is mounted on the top of the connecting shaft 113 and meshes with the first gear 111. The third synchronous pulley 114 is mounted on the bottom of the connecting shaft 113. The reduction motor 116 is mounted on the base 1. The fourth synchronous pulley 115 is mounted on the output shaft of the reduction motor 116 and is connected to the third synchronous pulley 114 via a synchronous belt.

[0030] The first gear 111 is fixedly mounted on the outer wall of the docking pipe 4. The connecting shaft 113 is vertically rotatably mounted on the base 1 via a bearing. The second gear 112 meshes with the first gear 111. The reduction motor 116 is mounted on the bottom of the base 1. The output shaft of the reduction motor 116 is fixedly connected to the connecting shaft 113 to drive the second gear 112 to rotate, thereby driving the first gear 111 and the docking pipe 4 to rotate.

[0031] In one embodiment, such as Figure 4 As shown, it also includes a wellhead connector 12, the upper end of which is detachably mounted to the bottom end of the connecting pipe 4 by bolts.

[0032] Before construction, select a suitable wellhead connector 12 according to the specifications of the current oil and gas wellhead interface. Fix the wellhead connector 12 to the bottom end of the docking pipe 4 with bolts. Then, adjust the height and angle of the docking pipe 4 using the lifting device 3 and the rotating joint 5 to align the wellhead connector 12 with the wellhead interface. The bottom end of the wellhead connector 12 is provided with internal threads, and the wellhead interface is provided with external threads. The rotating drive device 11 drives the docking pipe 4 to rotate, and the wellhead connector 12 and the wellhead interface are spirally connected to complete the docking. The tracer delivered by the external tracer supply device is injected into the oil and gas wellhead through the delivery pipe 6, the docking pipe 4, and then through the wellhead connector 12. After mixing with the fracturing fluid, it is injected into the reservoir. When the construction wellhead is changed or the wellhead interface specifications are changed, the original wellhead connector 12 can be removed and replaced with a suitable wellhead connector 12, and the docking can be re-done.

[0033] In one embodiment, such as Figure 4 As shown, a solenoid valve 13 is installed on the injection pipeline 9. The solenoid valve 13 is electrically connected to the control terminal of the device and is controlled by the signal of the pressure sensor 10. During normal injection, it remains open to ensure that the tracer delivered by the external tracer supply device smoothly enters the delivery pipeline 6. When the pressure sensor 10 detects an abnormal surge in pressure in the delivery pipeline 6, the control terminal triggers the solenoid valve 13 to close quickly to prevent the tracer from flowing back into the injection pipeline 9 and to provide a sealed environment for the hydraulic cylinder 8 to push the piston 7 to increase pressure, ensuring the pressure increase effect. After the pressure increase is completed, the control terminal controls the solenoid valve 13 to reopen, restoring the normal supply of the external supply device.

[0034] In one embodiment, such as Figure 2 As shown, the top of the support frame 31 is provided with a clearance groove 311 corresponding to the position of the hydraulic cylinder 8. The width and depth of the clearance groove 311 are both greater than the cross-sectional dimensions of the hydraulic cylinder 8, ensuring that the hydraulic cylinder 8 can pass smoothly through the clearance groove 311 when it rises and falls with the movable seat 2, thus avoiding interference with the support frame 31.

[0035] It should be noted that the above-mentioned technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification; and, for those skilled in the art, improvements or modifications can be made based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims of this utility model.

Claims

1. A smart injection device for fracturing tracers in oil and gas wells, comprising a base, characterized in that, It also includes a movable seat, a lifting device, a docking pipe, a rotary joint, a conveying pipe, a piston, and a hydraulic cylinder. The lifting device includes a support frame and a first lead screw and a second lead screw that are vertically rotatably disposed within the support frame. The support frame is disposed on the base, and the movable seat is threadedly connected to the first lead screw and the second lead screw respectively. The rotary joint includes a rotating end and a fixed end that can rotate relative to each other. The fixed end of the rotary joint is disposed on the movable seat. The docking pipe is disposed on the rotating end of the rotary joint. The conveying pipe is connected to the fixed end of the rotary joint. The hydraulic cylinder is disposed on the top of the movable seat. The hydraulic cylinder includes a cylinder body and a hydraulic rod. The cylinder body is disposed on the top of the movable seat. The hydraulic rod is slidably disposed on the bottom end of the cylinder body. The piston is disposed on the bottom end of the hydraulic rod and is slidably connected to the inner wall of the conveying pipe. The delivery pipeline is connected to an injection line and a pressure sensor.

2. The intelligent injection device for oil and gas well fracturing tracers according to claim 1, characterized in that, The lifting device further includes a first driving device, which is disposed on the base and is used to simultaneously drive the first lead screw and the second lead screw to rotate.

3. The intelligent injection device for oil and gas well fracturing tracers according to claim 2, characterized in that, The first driving device includes a first sprocket, a second sprocket, a third sprocket, a rotating shaft, a first synchronous pulley, a second synchronous pulley, and a first motor. The first sprocket is mounted on the first lead screw, the second sprocket is mounted on the second lead screw, the rotating shaft is rotatably mounted on the base, the third sprocket and the first synchronous pulley are respectively mounted at both ends of the rotating shaft, the first motor is mounted on the base, the second synchronous pulley is mounted on the output shaft of the first motor, the first synchronous pulley and the second synchronous pulley are connected by a synchronous belt, and the first sprocket, the second sprocket, and the third sprocket are connected by a chain.

4. The intelligent injection device for oil and gas well fracturing tracers according to claim 1, characterized in that, It also includes a rotary drive device, which is mounted on the base and is used to drive the docking pipe to rotate.

5. The intelligent injection device for oil and gas well fracturing tracers according to claim 4, characterized in that, The rotary drive device includes a first gear, a second gear, and a reduction motor. The first gear is mounted on the docking pipe, the second gear is rotatably mounted on the base and meshes with the first gear, and the reduction motor is mounted on the base to drive the second gear to rotate.

6. The intelligent injection device for oil and gas well fracturing tracers according to claim 1, characterized in that, It also includes a wellhead connector, which is detachably located at the end of the connecting pipe away from the rotary joint.

7. The intelligent injection device for oil and gas well fracturing tracers according to claim 1, characterized in that, A solenoid valve is installed on the injection pipeline.

8. The intelligent injection device for oil and gas well fracturing tracer according to claim 2, characterized in that, The support frame has a clearance groove on the side away from the base, corresponding to the hydraulic cylinder.

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