Underground layered self-generating device for oil-water well
The mechanical energy of the liquid flow is converted into electrical energy through the downhole layered self-generating device, which solves the high power consumption problem of high-frequency measurement and control and real-time communication of downhole tools, realizes stable power supply and long-life tools of cable-free intelligent injection and production process, and supports pressurized environmentally friendly operations.
Patent Information
- Application Number
- CN202410240566.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-09-05
AI Technical Summary
In existing downhole intelligent injection and production processes, batteries cannot meet the high power consumption requirements of high-frequency measurement and control and real-time communication of downhole tools, resulting in short tool life, low adjustment frequency, and the inability to perform pressurized environmental protection operations.
An underground stratified self-generating device is designed, which uses a turbine generator to convert the mechanical energy of the underground fluid flow into electrical energy, and supplies power to the intelligent production distributor to achieve self-sufficient electricity supply.
It achieves stable power supply for the cable-free intelligent injection and production process, reduces construction complexity and cable damage risk, supports pressurized environmentally friendly operations, and extends the working life of downhole tools.
Smart Images
Figure CN120592591A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil field production engineering, in particular to an underground stratified self-generating device for oil and water wells. Background Art
[0002] The Daqing Oilfield has entered the late stage of development with extremely high water cuts. After years of waterflooding, the remaining oil is highly dispersed, the oil-water distribution is extremely complex, and potential strata and high-water-cut strata intersect vertically, further exacerbating development challenges. To further improve oil recovery, there is an urgent need to enhance the level of detailed control at both the injection and production levels, shifting oilfield development from "fine" to "precise." In the late stage of extremely high water cuts, there are numerous wells and layers, and the injection-production relationship is complex. Accelerating reservoir dynamics complicate manual optimization and analysis, and the utilization of resources varies significantly between wells, layers, and injection-production directions. Manual optimization and analysis of injection-production plans is labor-intensive, inefficient, and challenging to adjust dynamically. Therefore, research was conducted on intelligent stratified control technology for wells in the late stage of extremely high water cuts. The resulting intelligent injection-production process achieves stratified flow control and real-time monitoring of downhole parameters, alleviating development challenges to a certain extent. However, in field applications, this process suffers from issues such as cable breakage, numerous leakage risk points, and operational difficulties, compromising process stability and effectiveness. Furthermore, the presence of cables prevents pressurized environmental protection operations. In response to the above problems, a cable-free process string was designed and developed. The cable-free intelligent injection process currently used in domestic oil fields is mainly based on pressure wave communication, which uses disposable batteries to achieve stable power supply for downhole intelligent electronic control equipment. It has the advantages of low process complexity and high construction efficiency. However, due to the influence of downhole space size, the battery volume and battery capacity are severely limited, which cannot meet the high-power application requirements of high-frequency measurement and control and real-time communication of downhole tools. As a result, the working life of downhole intelligent tools is short and the adjustment frequency is low, which seriously restricts the development and application of pressure wave intelligent injection technology. Summary of the Invention
[0003] In order to overcome the deficiency that the batteries of existing downhole intelligent injection and production strings cannot meet the requirements of high-frequency measurement, control and real-time communication of downhole tools, the present invention provides a downhole stratified self-generating device for oil and water wells. The downhole stratified self-generating device for oil and water wells can achieve self-sufficiency in electrical energy for the intelligent injection and production string, breaking through the limitation of downhole power supply on the service life of the string, thereby realizing a cable-free intelligent injection and production process.
[0004] The technical solution of the present invention is: a downhole stratified self-generating device for oil and water wells, comprising a main body, a groove is provided on the outer side of the middle part of the main body, a flow channel cover is provided in the groove, a turbine generator device is provided between the flow channel cover and the main body, an axial liquid flow channel B is opened on the flow channel cover corresponding to the turbine generator device, a liquid flow channel A is opened at the upper end of the main body and is connected to the liquid flow channel B, and the lower end of the liquid flow channel B is connected to the central channel inside the main body after passing through the turbine.
[0005] The turbine power generation device includes a stator frame, a radial rotating shaft is connected to the stator frame, a turbine is connected to the rotating shaft, the turbine corresponds to the liquid flow channel B, and a magnet ring is provided inside the turbine.
[0006] There are two turbine generators, which are symmetrical along the main body axis. There are two corresponding liquid flow channels A and two corresponding liquid flow channels B. The bottoms of the two liquid flow channels B are connected through an annular channel and then communicated with the central channel.
[0007] A central plug is provided inside the upper end of the main body, which closes the central channel but does not close the liquid flow channel A.
[0008] The interior of the upper end of the main body is an inclined surface, and the outlet of the liquid flow channel A is located on the inclined surface. The central plug cooperates with the inclined surface of the main body, and the top surface of the central plug is located below the outlet of the liquid flow channel A.
[0009] Sealing rings B are provided on the contact surfaces between the flow channel covers and the main body on the upper and lower sides of the turbine generator device.
[0010] Sealing rings C are provided on the contact surface between the stator frame and the flow channel cover, and on the contact surface between the stator frame and the main body.
[0011] The flow channel cover is fixed on the main body through fixing pins.
[0012] The lower end of the main body is connected to the intelligent dispensing device through a built-in slip ring to supply power to the intelligent dispensing device.
[0013] Hydraulic pressure is applied to the oil pipe to set the seal, and the downhole liquid flows into the liquid flow channel B from the liquid flow channel A, flushing the turbine, driving the turbine and the magnet ring to rotate, thereby generating electricity.
[0014] The present invention has the following beneficial effects: Due to the adoption of the above-mentioned solution, a liquid flow channel is provided on the main body and the flow channel cover. When the liquid passes through the liquid flow channel, it flushes the turbine, converting mechanical energy into electrical energy, thereby generating electricity and supplying power to the intelligent production distributor, achieving self-sufficiency in the electrical energy of the intelligent injection and production process, and completely breaking through the limitation of underground power supply on the process life. The present invention realizes a cable-free intelligent injection and production process, which is simple to construct and can be operated under pressure in an environmentally friendly manner; it significantly reduces process complexity and the risk of process failure caused by cable damage in the original cable-controlled intelligent injection and production; the device retains a central test channel, which can realize water absorption profile testing without changing the original process string structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is along Figure 1 Cross-sectional view of AA in the figure.
[0016] In the figure, 1-upper joint, 2-main body, 3-sealing ring A, 4-center plug, 5-flow channel cover, 6-sealing ring B, 7-sealing ring C, 8-turbine, 9-rotating shaft, 10-magnet ring, 11-stator frame, 12-fixing pin, 13-liquid flow channel A, 14-liquid flow channel B, 15-center channel. DETAILED DESCRIPTION
[0017] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 、 Figure 2 As shown, a downhole stratified self-generating device for oil and water wells includes a main body 2, the upper end of which is externally connected to an upper joint 1, and a sealing ring A3 is provided between the main body 2 and the upper joint 1. A groove is provided on the outer middle portion of the main body 2, and a flow channel cover 5 is provided within the groove. A turbine generator is provided between the flow channel cover 5 and the main body 2. An axial liquid flow channel B14 is provided on the flow channel cover 5 at a position corresponding to the turbine generator. Liquid flow channel B14 runs through the flow channel cover 5. A liquid flow channel A13 is provided at the upper end of the main body 2, communicating with liquid flow channel B14. After passing through the turbine 8, the lower end of liquid flow channel B14 communicates with the central channel 15 within the main body 2. In other words, liquid can pass through liquid flow channels A13 and B14 and then enter the central channel 15. During this process, the liquid drives the turbine generator to generate electricity.
[0018] The main body 2 has two grooves on its exterior, symmetrically arranged along its axis. Each groove houses a turbine generator unit. Two corresponding fluid channels A13 and B14 are also present. The two fluid channels B14 are connected at their bottoms by an annular channel, which in turn communicates with the central channel 15. Each turbine generator unit is fitted with a flow channel cover 5, secured to the main body 2 by a fixing pin 12.
[0019] The upper end of the main body 2 is provided with an inclined surface, and the outlet of the liquid flow channel A13 can be opened on the inclined surface. When the self-generating device is working, the center plug 4 is placed inside the upper end of the main body 2. The center plug 4 cooperates with the main body 2 through the inclined surface. The top surface of the center plug 4 is located below the outlet of the liquid flow channel A13, so that the center plug 4 closes the center channel 15 but does not close the liquid flow channel A13. The downhole liquid enters through the liquid flow channel A13, passes through the liquid flow channel B14, and flows out from the center channel 15 at the bottom. In this process, the liquid flow flushes the turbine generator, converts mechanical energy into electrical energy, and provides long-term and stable power supply for the intelligent dispenser. If the water injection volume is large enough, the center plug 4 can also be omitted. In this way, while the liquid passes through the center channel 15, a part of it will also enter the liquid flow channel A13, driving the turbine generator to generate electricity.
[0020] The turbine generator comprises a stator frame 11. A groove is formed on the inner side of the flow channel cover 5, and the stator frame 11 is positioned within the groove. The stator frame 11 contacts the main body 2 on its inner side and the flow channel cover 5 on its outer side. A radial shaft 9 is connected to the stator frame 11. The shaft 9 extends outward from the stator frame 11 and connects to a turbine 8. The turbine 8 corresponds to the liquid flow channel B14 on the flow channel cover 5. A magnet ring 10 is positioned inside the turbine 8. The turbine 8 can rotate along the shaft 9 under external force. Rotation of the turbine 8 drives the magnet ring 10 along with it, thereby generating electricity. Seal rings C7 are installed on the contact surfaces between the stator frame 11 and the flow channel cover 5, and on the contact surfaces between the stator frame 11 and the main body 2. Similarly, seal rings B6 are installed on the contact surfaces between the flow channel cover 5 and the main body 2 on both the upper and lower sides of the turbine generator. This allows the central channel 15 of the main body 2 to be sealed by the central plug 4, allowing liquid to flow entirely through the liquid flow channels A13 and B14, thereby driving the turbine generator to generate electricity.
[0021] During field use, the oil pipe is connected to the self-generating device, the intelligent injection (production) device, the packer, and other tools, and then lowered into the well. Hydraulic pressure is applied to the oil pipe to set the seal. After the seal is successfully set, the water injection (oil production) well operates normally, and the downhole liquid passes through the internal flow channel of the upper joint 1. Since the center plug 4 at this time closes the upper end of the center channel 15 of the main body 2, the liquid enters the liquid flow channel B14 from the liquid flow channel A13, flushing the turbine 8, driving the turbine 8 and the magnet ring 10 to rotate, converting mechanical energy into electrical energy, thereby generating electricity. The connection between the layered self-generating device and the intelligent production device is equipped with an internal slip ring to power the intelligent production device, replacing the original disposable battery power supply mode, and achieving long-term stable power supply for each layer of the downhole tool without external power.
Claims
1. A downhole stratified self-generating device for an oil and water well, comprising a main body (2), characterized in that: A groove is provided on the outer side of the middle portion of the main body (2), a flow channel cover (5) is provided in the groove, a turbine generator device is provided between the flow channel cover (5) and the main body (2), an axial liquid flow channel B (14) is provided on the flow channel cover (5) corresponding to the turbine generator device, a liquid flow channel A (13) is provided at the upper end of the main body (2) and is communicated with the liquid flow channel B (14), and the lower end of the liquid flow channel B (14) is communicated with the central channel (15) inside the main body (2) after passing through the turbine (8).
2. The downhole stratified self-generating device for oil and water wells according to claim 1, characterized in that: The turbine power generation device comprises a stator frame (11), a radial rotating shaft (9) is connected to the stator frame (11), a turbine (8) is connected to the rotating shaft (9), the turbine (8) corresponds to the liquid flow channel B (14), and a magnet ring (10) is provided inside the turbine (8).
3. The downhole stratified self-generating device for oil and water wells according to claim 2, characterized in that: There are two turbine generators, which are symmetrical along the axis of the main body (2). There are two corresponding liquid flow channels A (13) and liquid flow channels B (14). The bottoms of the two liquid flow channels B (14) are connected through an annular channel and then communicated with the central channel (15).
4. The downhole stratified self-generating device for oil and water wells according to claim 3, characterized in that: A central plug (4) is provided inside the upper end of the main body (2), and the central plug (4) closes the central channel (15) but does not close the liquid flow channel A (13).
5. The downhole stratified self-generating device for oil and water wells according to claim 4, characterized in that: The interior of the upper end of the main body (2) is an inclined surface, and the outlet of the liquid flow channel A (13) is located on the inclined surface. The central plug (4) matches the inclined surface of the main body (2), and the top surface of the central plug (4) is located below the outlet of the liquid flow channel A (13).
6. The downhole stratified self-generating device for oil and water wells according to claim 5, characterized in that: Sealing rings B (6) are provided on the contact surfaces between the flow channel covers (5) and the main body (2) on the upper and lower sides of the turbine generator device.
7. The downhole stratified self-generating device for oil and water wells according to claim 6, characterized in that: A sealing ring C (7) is provided on the contact surface between the stator frame (11) and the flow channel cover (5), and on the contact surface between the stator frame (11) and the main body (2).
8. The downhole stratified self-generating device for oil and water wells according to claim 7, characterized in that: The flow channel cover (5) is fixed to the main body (2) via a fixing pin (12).
9. The downhole stratified self-generating device for oil and water wells according to claim 8, characterized in that: The lower end of the main body (2) is connected to the intelligent dispensing device via a built-in slip ring to supply power to the intelligent dispensing device.
10. The downhole stratified self-generating device for oil and water wells according to claim 9, characterized in that: Hydraulic pressure is applied to the oil pipe to seal the well, and the downhole liquid enters the liquid flow channel B (14) from the liquid flow channel A (13), flushes the turbine (8), drives the turbine (8) and the magnet ring (10) to rotate, and realizes power generation.