Oil well intelligent separate production system based on flow wave coding control and implementation method

Abstract

The invention relates to an oil well intelligent separate production system based on flow wave coding control and an implementation method.The oil well intelligent separate production system based on flow wave coding control comprises a plurality of intelligent separate production devices and packers which are alternately arranged in the axial direction of an oil well, and the intelligent separate production devices and the packers are connected through production pipe columns; the production pipe column is connected with an oil conveying pipeline, and the oil conveying pipeline is provided with a flow wave generator used for generating flow fluctuation of a certain rule. The flow generator is adopted to generate the regular flow waves, the valve opening degree of the intelligent separate recovery device is wirelessly controlled through the regular flow waves, allocation is performed according to the water outlet condition of each oil layer, the opening degree of the bottom-hole regulator corresponding to each production layer is controllably adjusted, and therefore fine adjustment and control of the liquid production capacity are achieved, the construction process is simple, and the cost is low. The working intensity is reduced, the construction cost of an oil well is reduced, and the crude oil exploitation efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of petroleum extraction technology, and in particular relates to an intelligent oil well extraction system and implementation method based on flow wave coding control. Background Technology

[0002] Currently, oilfields are entering a stage of high and ultra-high water cut. Old oilfields have low oil production efficiency, serious imbalance between input and output, and traditional extraction tools have long construction cycles and complex processes.

[0003] Therefore, it is necessary to provide a new intelligent oil well production system and implementation method based on flow wave coding control to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent oil well production system and implementation method based on flow wave coding control in order to solve the above problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] An intelligent oil well production system based on flow wave coding control includes multiple intelligent production units and packers alternately arranged along the oil well axis. The intelligent production units and packers are connected through a production tubing string, which is connected to an oil pipeline. A flow wave generator for generating regular flow fluctuations is installed on the oil pipeline.

[0007] As a further optimization of the present invention, it also includes a wellhead mechanism and a walking beam pumping unit; the production tubing is connected to the oil pipeline through the wellhead mechanism; a sucker rod is connected to the walking beam pumping unit, and the bottom end of the sucker rod extends into the production tubing.

[0008] As a further optimization of the present invention, the intelligent data acquisition device includes a control circuit board, a high-temperature battery pack, a drive shaft system, a flow meter, and a valve. The drive shaft system, the high-temperature battery pack, and the flow meter are all connected to the control circuit board. The drive shaft system is used to open or close the valve, and the flow meter is used to detect changes in flow rate inside the oil pipe.

[0009] As a further optimization of the present invention, the intelligent data collector further includes a positioning seat, a shaft fixing seat, a circuit board cavity center tube, and a liquid passage center tube. The drive shaft is bolted to the shaft fixing seat. The circuit board cavity center tube is fixed by the shaft fixing seat and the positioning seat. The liquid passage center tube is connected to the shaft fixing seat and the positioning seat to form a concentric liquid passage channel. A circuit board housing is connected to the shaft fixing seat. The positioning seat is radially positioned by the circuit board housing. A lower connector is provided on one side of the positioning seat. The lower connector has an annular groove. A split nut is installed in the annular groove. The split nut is connected to the circuit board cavity housing. A valve core housing is connected to the circuit board cavity housing. An upper connector is provided on one side of the valve core housing.

[0010] As a further optimization of the present invention, the packer is provided with a rubber plug. When water is injected and pressurized into the production tubing, the rubber plug of the packer tightens the inner wall of the oil production casing, thus completing the sealing between oil layers.

[0011] As a further optimization of the present invention, the control circuit board has a built-in program. When the flow meter detects regular fluctuations in the flow rate within the production column and transmits the flow signal to the control circuit board, the control circuit board identifies the number N of different flow waves and the duration XT of the flow waves, where T represents the wavelength period and X represents the number of periods. Then, based on the valid N+XT flow waves in the coding principle, the drive shaft system is controlled to operate, thereby adjusting the valve opening.

[0012] As a further optimization of the present invention, the control circuit board periodically identifies the flow rate value in the oil pipe, and takes the average value of the obtained flow rate value to offset the false identification caused by intermittent suction flow. When the flow rate is always low after a preset number of consecutive detections, the system is activated, and the corresponding coding program is identified after the system is activated.

[0013] As a further optimization of the present invention, the control circuit board identifies the flow rate value in the oil pipe periodically every three minutes, and the preset number of detections is ten.

[0014] As a further optimization of the present invention, multiple intelligent distribution units are arranged along the oil well axis, wherein the uppermost one is designated as the first layer of intelligent distribution units. The flow wave number in the coding principle of the first layer of intelligent distribution units is set to be N+1, and the flow wave number in the coding principle of the Nth layer of intelligent distribution units is N+1. Different opening degree coding principles correspond to the wavelength period XT, and the opening degree is adjusted between multiple layers.

[0015] An implementation method for an intelligent oil well production system based on flow wave coding control includes the following steps:

[0016] The production tubing connects the intelligent production unit and the packer, and is lowered to the oil layer location. Water is then injected and pressurized to tighten the rubber plug of the packer to the inner wall of the production casing, thereby separating the oil layer.

[0017] Install sucker rods, wellhead mechanisms, and beam pumping units;

[0018] A flow wave generator is installed on the oil pipeline; the flow area of ​​the oil pipeline is adjusted by controlling the flow generator at the wellhead to achieve flow regulation. Regular flow fluctuations are generated in the downhole production string by regularly adjusting the flow at the wellhead.

[0019] The flow meter in the intelligent oil layer distributor detects regular flow fluctuations in the production tubing, and the control circuit board identifies the regular flow signals. The control circuit board then adjusts the valve opening by controlling the drive shaft system, thereby achieving the adjustment of the valve opening of the multi-layer intelligent oil layer distributor.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention uses a flow generator to produce regular flow waves, which are then used to wirelessly control the valve opening of the intelligent production generator. The flow waves are adjusted according to the water production of each oil layer, allowing for controllable adjustment of the opening of the corresponding production generator for each production layer. This enables precise control of the fluid production, simplifies the construction process, reduces workload and construction costs of oil wells, and improves crude oil extraction efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the system of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the intelligent data acquisition device of the present invention in the valve closed state;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the intelligent data acquisition device of the present invention in the valve open state;

[0025] Figure 4 This is a diagram showing the relationship between flow rate and time in the pipeline in an embodiment of the present invention;

[0026] Figure 5 This is a diagram illustrating the coding principle of the intelligent data acquisition unit in an embodiment of the present invention.

[0027] In the diagram: 100, Intelligent Production Separator; 200, Packer; 300, Production Tubing; 400, Oil Pipeline; 500, Flow Wave Generator; 600, Wellhead Mechanism; 700, Sucker Rod; 800, Beam Pumping Unit;

[0028] 1. Lower connector; 2. Split nut; 3. Circuit board cavity housing; 4. Positioning seat; 5. Control circuit board; 6. High temperature battery pack; 7. Drive shaft system; 8. Shaft system fixing seat; 9. Shaft system housing; 10. Valve core housing; 11. Upper connector; 12. Liquid flow center tube; 13. Flow meter; 14. Circuit board cavity center tube. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0030] like Figure 1 As shown, an intelligent oil well production system based on flow wave coding control includes multiple intelligent production units 100 and packers 200 alternately arranged along the oil well axis. The intelligent production units 100 and the packers 200 are connected through a production tubing string 300. An oil pipeline 400 is connected to the production tubing string 300, and a flow wave generator 500 for generating a certain regular flow fluctuation is installed on the oil pipeline 400. The system also includes a wellhead mechanism 600 and a walking beam pumping unit 800. The production tubing string 300 is connected to the oil pipeline 400 through the wellhead mechanism 600. A sucker rod 700 is connected to the walking beam pumping unit 800, and the bottom end of the sucker rod 700 extends into the production tubing string 300.

[0031] like Figure 2 As shown, the intelligent data collector 100 includes a lower connector 1, a split nut 2, a circuit board cavity housing 3, a positioning seat 4, a control circuit board 5, a high-temperature battery pack 6, a drive shaft system 7, a shaft system fixing seat 8, a shaft system housing 9, a valve core housing 10, an upper connector 11, a liquid-passing center tube 12, a flow meter 13, and a circuit board cavity center tube 14. The drive shaft system 7 is bolted to the shaft system fixing seat 8. The high-temperature battery pack 6 provides power to the tool control system and the execution system. The DC motor in the drive shaft system 7 is controlled by a timed valve opening program set in the control circuit board 5, causing the drive shaft system to perform the valve opening action. Figure 2 The valve is in the closed state. Figure 3 This indicates the valve is in the open state.

[0032] The circuit board cavity center tube 14 is fixed by the positioning holes of the shaft fixing seat 8 and the positioning seat 4. The shaft fixing seat 8 is connected to the circuit board housing 3 by a threaded pair. The positioning seat 4 is radially positioned by the circuit board housing 3. The lower connector 1 is provided with an annular groove. The split nut 2 is placed in the annular groove of the lower connector 1 and is connected to the circuit board cavity housing 9 by a threaded pair to achieve axial fixation of the positioning seat 4. The flow meter 13 detects the regular flow changes inside the oil pipe.

[0033] like Figure 4 As shown, the flow wave generator 500 controls the flow wave generator to regularly change the flow area of ​​the oil pipeline, thereby affecting the regular changes in the flow rate in the production pipeline. The flow meter 13 in the oil well intelligent distributor 100 identifies and detects the regular fluctuations in the flow rate in the pipeline and transmits the flow signal to the control circuit board 5. According to the built-in program of the control circuit board 5, the number N of different regular flow waves and the flow wave duration XT are identified, where T represents the wavelength period and X represents the number of periods. Then, according to the effective N+XT flow waves in the coding principle, the DC motor in the drive shaft system 7 is controlled to rotate forward or reverse, thereby realizing the opening adjustment of the oil well intelligent distributor. In this embodiment, the wavelength period T is 30s. Before the regular fluctuations in the flow rate in the pipeline, the flow fluctuations are irregular. At this time, the wake-up flow wave appears, which is a buffer process before the regular fluctuations in the flow rate.

[0034] The packer 200 is equipped with a rubber plug. When water is injected and pressurized into the production tubing 300, the rubber plug of the packer 200 tightens the inner wall of the oil production casing, thus completing the sealing between oil layers.

[0035] The control circuit board 5 identifies the flow rate in the oil pipe every 3 minutes. The flow rate value is averaged to offset the false identification caused by intermittent suction flow. The system is activated after 10 consecutive low flow rate detections. After the system is activated, it identifies the corresponding coded program.

[0036] like Figure 5 As shown, multiple intelligent distribution units 100 are arranged along the axis of the oil well. The topmost one is designated as the first layer of intelligent distribution units 100. The coding principle for the first layer of intelligent distribution units 100 is set to a flow wavenumber of 2, and the coding principle for the Nth layer of intelligent distribution units is set to a flow wavenumber of N+1. Different opening degree coding principles correspond to the wavelength period XT, and the opening degree is adjusted between multiple layers. Specifically, when the flow wavenumber is 2 and the wavelength period is 1T, the valve opening degree is 10%; when the flow wavenumber is 2 and the wavelength period is 2T, the valve opening degree is 20%; when the flow wavenumber is 2 and the wavelength period is 10T, the valve opening degree is 100%.

[0037] An implementation method for an intelligent oil well production system based on flow wave coding control includes the following steps:

[0038] Step 1: Connect the intelligent separation unit 100 and packer 200 through the production tubing 300. The one-way valve is lowered to the oil layer position along with the tubing. Water is injected and pressurized through the wellhead pump truck, and the rubber plug of the packer 200 is tightened and set to seal, thereby separating the oil layer.

[0039] Step 2: Install sucker rod 700, packing, wellhead mechanism 600, and walking beam pumping unit 800;

[0040] Step 3: Install a flow wave generator 500 on the wellhead oil pipeline 300; adjust the flow area of ​​the oil pipeline 300 by controlling the wellhead flow generator 500 to achieve flow regulation. By regularly adjusting the flow at the wellhead, regular flow fluctuations are generated in the downhole production string 300. The flow meter 13 in the intelligent production generator 100 detects the regular flow fluctuations in the production string 300. Then, the system in the control circuit board 5 identifies the regular flow signal and adjusts the valve opening of the intelligent production generator by controlling the drive shaft system 7 to achieve the adjustment of the valve opening of the multi-layer intelligent production generator.

[0041] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An intelligent oil well production system based on flow wave coding control, characterized in that, It includes multiple intelligent production units (100) and packers (200) arranged alternately along the axis of the oil well. The intelligent production units (100) and the packers (200) are connected by a production tubing (300). An oil pipeline (400) is connected to the production tubing (300). A flow wave generator (500) for generating a certain regular flow fluctuation is installed on the oil pipeline (400).

2. The intelligent oil well production system based on flow wave coding control according to claim 1, characterized in that, It also includes a wellhead mechanism (600) and a walking beam pumping unit (800); the production tubing (300) is connected to the oil pipeline (400) through the wellhead mechanism (600); a sucker rod (700) is connected to the walking beam pumping unit (800), and the bottom end of the sucker rod (700) extends into the production tubing (300).

3. The intelligent oil well production system based on flow wave coding control according to claim 1, characterized in that, The intelligent data collector (100) includes a control circuit board (5), a high-temperature battery pack (6), a drive shaft system (7), a flow meter (13), and a valve. The drive shaft system (7), the high-temperature battery pack (6), and the flow meter (13) are all connected to the control circuit board (5). The drive shaft system (7) is used to open or close the valve, and the flow meter (13) is used to detect changes in flow rate inside the oil pipe.

4. The intelligent oil well production system based on flow wave coding control according to claim 3, characterized in that, The intelligent data collector (100) also includes a positioning seat (4), a shaft fixing seat (8), a circuit board cavity center tube (14), and a liquid passage center tube (12). The drive shaft (7) is bolted to the shaft fixing seat (8). The circuit board cavity center tube (14) is fixed by the shaft fixing seat (8) and the positioning seat (4). The liquid passage center tube (12) is connected to the shaft fixing seat (8) and the positioning seat (4) to form a concentric liquid passage channel. (8) A circuit board housing (3) is connected to the upper part, and the positioning seat (4) is radially positioned by the circuit board housing (3); a lower connector (1) is provided on one side of the positioning seat (4), and an annular groove is provided on the lower connector (1). A split nut (2) is installed in the annular groove. A circuit board cavity housing (9) is connected to the split nut (2), and a valve core housing (10) is connected to the circuit board cavity housing (9). An upper connector (11) is provided on one side of the valve core housing (10).

5. The intelligent oil well production system based on flow wave coding control according to claim 1, characterized in that, The packer (200) is equipped with a rubber plug. When water is injected and pressurized into the production tubing (300), the rubber plug of the packer (200) tightens the inner wall of the oil production casing, thus completing the sealing between oil layers.

6. The intelligent oil well production system based on flow wave coding control according to claim 3, characterized in that, The control circuit board (5) has a built-in program. When the flow meter (13) detects the regular fluctuation of the flow in the production column (300) and transmits the flow signal to the control circuit board (5), the control circuit board (5) identifies the number N of different flow waves and the duration XT of the flow waves, where T represents the wavelength period and X represents the number of periods. Then, according to the effective N+XT flow waves in the coding principle, the drive shaft system (7) is controlled to operate, thereby realizing the opening adjustment of the valve.

7. The intelligent oil well production system based on flow wave coding control according to claim 3, characterized in that, The control circuit board (5) periodically identifies the flow rate value in the oil pipe, and the obtained flow rate value is averaged to offset the false identification caused by intermittent suction flow. When the flow rate is always low after a preset number of consecutive detections, the system is activated and the corresponding coding program is identified after the system is activated.

8. The intelligent oil well production system based on flow wave coding control according to claim 7, characterized in that, The control circuit board (5) identifies the flow rate value in the oil pipe every three minutes, and the preset number of detections is ten.

9. The intelligent oil well production system based on flow wave coding control according to claim 7, characterized in that, Multiple intelligent distribution units (100) are arranged along the axis of the oil well, with the topmost one designated as the first layer of intelligent distribution units (100). The flow wave number in the coding principle of the first layer of intelligent distribution units (100) is set to 2, and the flow wave number in the coding principle of the Nth layer of intelligent distribution units is set to N+1. Different opening degree coding principles correspond to the wavelength period XT, and the opening degree is adjusted between multiple layers.

10. An implementation method for an intelligent oil well production system based on flow wave coding control, characterized in that, Includes the following steps: The production tubing (300) is connected to the intelligent production unit (100) and the packer (200), and then lowered to the oil layer position. Water is then injected and pressurized to tighten the rubber plug of the packer (200) to the inner wall of the production casing, thereby separating the oil layer. Install sucker rod (700), wellhead mechanism (600) and beam pumping unit (800); A flow wave generator (500) is installed on the oil pipeline (400); the flow area of ​​the oil pipeline (400) is adjusted by controlling the wellhead flow generator (500) to achieve flow regulation. Regular flow fluctuations are generated in the downhole production string (300) by regularly adjusting the flow at the wellhead. The flow meter (13) in the intelligent distributor (100) detects regular flow fluctuations in the production tubing (300), and the control circuit board (5) identifies the regular flow signal. The control circuit board (5) adjusts the valve opening by controlling the drive shaft system (7), thereby realizing the adjustment of the valve opening of the multi-layer intelligent distributor.

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