Oil well intelligent balanced production pipe column and construction method

Abstract

The invention relates to the technical field of oil field oil production engineering, in particular to an oil well intelligent balanced production pipe column and a construction method. Comprising a guide screwed plug, an oil pipe, a balanced production tool, a layered packer, an oil well pump, a cable and a ground control system. The guiding plug is located at the lowest end of the tubular column string, the balanced production tools and the layered packer are connected in series through the oil pipe, the layered packer is used for separating oil layers, and the cable is connected with the balanced production tools, can penetrate through the layered packer and is finally connected to the ground control system. According to the bottom-hole regulator disclosed by the invention, the bottom-hole regulator is quickly regulated by adopting a design mode of an underground electric control liquid path channel, hydraulic direct pushing and multiple tracks; the mode that a motor controls liquid path pressurization and underground liquid path rapid pressure relief is adopted, and rapid response of the bottom-hole regulator is achieved; a variable-density liquid inlet hole adjusting mode is adopted, and linear adjustment under multiple underground rails is achieved; a multi-stage inner vulcanization sealing mechanism is arranged underground, and the problem that a sealing piece is prone to damage under high pressure is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield oil production engineering, and particularly relates to an intelligent balanced production string for oil wells and a construction method thereof. Background Art

[0002] During the process of oil extraction, there are large differences between layers in the same oil reservoir. Some layers have a high water cut. In order to achieve stable oil production and water control in each oil layer and realize fine oil production in each layer, it poses a challenge to the layered oil production technology.

[0003] Layered production allocation is to divide the oil layers into several production intervals by setting packers in the well according to the requirements of oilfield development. Install production allocators in each different interval and install downhole oil nozzles with different diameters to control different production pressure differences in order to obtain different production rates.

[0004] Layered production allocation is to divide the oil layers into several production intervals in the oil well according to the needs of oilfield development, lower a layered production allocation string, and install oil nozzles with different diameters on the production allocators in each interval respectively to control different production pressure differences to achieve single-tube layered quantitative oil production in the same well, give full play to the role of medium and low permeability layers, ensure long-term high and stable production of the oilfield, and thus achieve the purpose of improving the ultimate recovery rate.

[0005] For oilfields developed by internal cutting water injection to maintain formation pressure, the purpose of layered production allocation is to reduce interlayer interference, improve development effect, reduce water cut ratio, so as to increase the oil production rate and recovery rate. That is, produce more oil and better oil, and ensure high and stable production at a certain rate.

[0006] Focus on layered water allocation, combine water allocation and production allocation, and comprehensively realize layered exploitation. Handle well the relationship among pressure, water cut, and oil production.

[0007] The production allocation of oil wells takes natural oil sand bodies as the basic consideration unit, and is divided into restricted layers and enhanced layers. The enhanced layer refers to the interval where the oil production rate needs to be increased compared with that before layered production allocation; the restricted layer needs to be reduced. The restricted layer of an oil well is equivalent to the restricted layer or shut-off layer of an injection well, and the enhanced layer of an oil well is equivalent to the enhanced layer of an injection well.

[0008] Maximize the production capacity of medium and low permeability layers and protect high permeability layers. For high permeability layers without water breakthrough, the oil production rate can be appropriately increased. For old oilfields with a long development time, the oil production rates of each layer do not have to be the same, and different intervals should be treated differently.

[0009] In the initial stage of oilfield development in the 1960s, Daqing Oilfield successfully developed a layered oil production technology mainly based on well packers and 625-type well production regulators. When producing oil with 62mm tubing in 139.7mm casing wells, up to 5 levels of production regulators could be installed. The oil production of each layer section was adjusted through the movable choke of the 625 production regulator to conduct quantitative oil production in layered sections of the well. Since the rubber cylinder of the squeeze-type packer achieved sealing through the interference caused by cone extrusion, its adaptability to the inner diameter of the casing was poor, and cones needed to be replaced for casings with different inner diameters, which affected the success rate of a single trip into the well. This string was widely used during the medium and low water cut periods of the oilfield, with a scale of over 1,200 wells. The success rate of a single trip of the packer into the well was about 80%. This structure played an important role during the exploitation of Daqing Oilfield in the medium and low water cut periods.

[0010] At the same time, for oil wells with large differences in reservoir properties that could be divided into two major layer sections, a dual-tubing separate production technology was developed, which completely solved the interference between the two layers, fully exploited the potential of each layer section, and greatly increased the oil production rate. This string consisted of a dual-tubing Christmas tree, a main pipe, and a sub-pipe. Downhole tools such as packers, working barrels, and screens were installed on the main pipe. In terms of technology, it could conduct layered testing and chemical paraffin removal. It was suitable for oil wells with large differences in reservoir pressure and serious interlayer interference. Due to the complex operation process and large construction difficulty of this string, and the excessive frictional loss of 38mm tubing for oil wells with high liquid production, it was not widely promoted.

[0011] In the 1970s, the oilfield entered the medium water cut stage. As the water cut of the oilfield increased, the development targets shifted from high-permeability layers to low-permeability and extra-low-permeability oil layers. To meet the requirements of the layered production allocation process, a multi-purpose eccentric production control system for oil wells was developed, enabling the production allocation layers to reach 7 - 8 levels. The number of packer stages in the string increased, the choke could be adjusted arbitrarily without pulling the string, it could conduct layered testing, and the string could be tripped in and out without plugging or killing the well, meeting the needs of oilfield development. This string consisted of downhole tools such as compression packers and eccentric production regulators. It was developed in response to the problems of the 625-type production regulator layered oil production string, such as inability to subdivide, poor adaptability to changes in the inner diameter of the casing, and difficulty in meeting the development needs of the oilfield in the medium and high water cut periods. Its characteristics were that the number of eccentric production regulator stages was not restricted, the plugging devices of each layer section could be fished and replaced with chokes arbitrarily using wire, it had strong adaptability to the inner diameter of the casing (139.7mm - 146.05mm), and the success rate of a single trip into the well could reach over 90%. This type of production regulator made important contributions to "stabilizing oil production and controlling water cut" after the oilfield entered the medium and high water cut periods of exploitation and achieving continuous stable production of over 50 million tons.

[0012] After investigation, the current driving methods of production regulators mainly include mechanical driving, hydraulic driving, electric driving, and pressure wave driving.

[0013] Each method has its own advantages and disadvantages. The mechanical drive type has a complex process and slow action execution; for the hydraulic drive type, the hydraulic pipeline runs from the wellhead through to the bottom of the well, and the pipe string is relatively long, resulting in low working efficiency; for the electric drive type, the motor directly controls the choke valve switch, and the switching force of the choke valve is small; for the pressure wave transmission method, the transmission efficiency is low.

[0014] Chinese Patent No. 201511005560.7 discloses an electronically controlled intelligent well completion measurement and adjustment system and method. The system includes: a wireless remote control device, a wellhead measurement and control device, and an underground integrated measurement and control production-allocation device. Among them: the wireless remote control device is connected to the wellhead measurement and control device through a wireless transmission method, and is used to generate a flow control signal and transmit the flow control signal to the wellhead measurement and control device through the wireless transmission method; the wellhead measurement and control device is connected to the underground integrated measurement and control production-allocation device through a single-core steel pipe cable, and is used to receive the flow control signal and transmit the flow control signal to the underground integrated measurement and control production-allocation device through the steel pipe cable to control the flow of the underground integrated measurement and control production-allocation device. The present invention solves the technical problem of the short service life of underground equipment in the prior art and achieves the technical effect of effectively improving the service life of underground equipment. However, this patent uses an underground motor to adjust the choke valve to achieve the purpose of water control and oil stabilization, but there is a small direct thrust and difficulty in later adjustment.

[0015] Chinese Patent No. 201610177862.0 discloses a production-allocation device for underground layered oil wells. The present invention relates to a production-allocation device, which includes an upper joint body, an upper cable body, a motor cavity, a shaft system cavity, an upper connecting body, an adjustment cavity, a flowmeter upper connecting body, a flowmeter cavity, a flowmeter lower connecting body, a liquid inlet cavity, a central pipe, a lower joint body, a cable passing mechanism, a motor drive mechanism, a pressure and temperature detection mechanism, a shaft system transmission mechanism, a flow adjustment mechanism, a flow monitoring mechanism, and a water cut monitoring mechanism. The present invention solves the problem that in the prior art, when the working conditions of the eccentric production-allocation device used in oil fields change, it is difficult to ensure layered quantitative production allocation, and improves the structural form of the production-allocation device so that when the well conditions change, the flow rate remains stable. The main difference between this patent and Chinese Patent No. 201511005560.7 is that this patent transmits signals to the ground through a cable, while Chinese Patent No. 201511005560.7 uses a wireless transmission method to transmit data. The core of this invention patent still adopts an electronically controlled method, and the motor directly controls the opening degree of the production-allocation device, and the control force of the production-allocation device is small.

[0016] Chinese Patent No. 200810064970.2 discloses a method for layer-by-layer production allocation of a production string tool for a submersible electric pump well. The production string tool mainly consists of a tubing string, a releasing joint, a cable connection male plug, a control cable, a slip-type packer, an electric production allocator, a measurement and control device, a balanced packer, and a tail pipe. The layer-by-layer production allocation method is realized by using this injection string tool, which is mainly used in submersible electric pump wells in oil fields. Its advantages are simple and novel structure, which can achieve layer-by-layer production allocation of 2 - 5 intervals under pumping conditions, and can adjust the liquid production of any production interval, effectively alleviating the interlayer contradiction and reducing the water cut. However, this patent uses a cable plug to connect the cable, which has a high risk and low reliability. At the same time, this patent still uses a motor to directly control the choke, with a small direct thrust and difficult adjustment in the later stage. Summary of the Invention

[0017] The object of the present invention is to provide an intelligent balanced production string for oil wells and a construction method in view of the deficiencies in the prior art. The string uses a cable to control the movement of the motor to achieve hydraulic force amplification, and the hydraulic force amplification controls the size of the production channel by an internal sealed valve rod. The device uses dual motors for control, one group of motors controls the pressurization action, and the other group of motors controls the pressure relief action.

[0018] The technical solution is as follows: An intelligent balanced production string for oil wells includes a guide nipple, a tubing string, a balanced production tool, a layer-by-layer packer, a submersible pump, a cable, and a ground control system. The guide nipple is located at the bottom of the string. The balanced production tool and the layer-by-layer packer are connected in series through the tubing string. The layer-by-layer packer is used to separate each oil layer. The cable is connected to each balanced production tool and can pass through the layer-by-layer packer and finally connect to the ground control system.

[0019] Further, the balanced production tool includes a coupling, an upper central tube, a cable joint, an oil storage chamber, an external seal cylinder, a PLC circuit, Motor 1, Motor 2, a booster pump, a pressure relief pump, a three-way joint, a hydraulic pipeline, an upper connecting piece, a piston, a middle central tube, a middle connecting piece, a track rod, a track nail seat, track nails, a lower connecting piece, a spring, a compression sleeve, a production sleeve, a vulcanized body, a sealed valve rod, and a lower joint.

[0020] Further, the upper central tube is threadedly connected to the coupling, and the external seal cylinder is threadedly connected to the upper central tube. The external seal cylinder and the upper central tube enclose a cavity, in which an oil storage chamber, a PLC circuit, Motor 1, Motor 2, a booster pump, a pressure relief pump, and a three-way joint are armored. One port of the three-way joint is connected to the booster pump, one port is connected to the pressure relief pump, and one port is connected to the piston, and the connection methods are all through hydraulic pipelines.

[0021] Further, the oil storage cavity can provide hydraulic oil. The motor can control the movement of the booster pump and the pressure relief pump. The upper part of the outer side of the upper central pipe is threadedly connected to the lower part of the external sealing cylinder. The lower part of the upper central pipe is threadedly connected to the upper part of the upper connecting piece. The upper connecting piece is provided with a clamping arm cavity, and a piston is installed in the clamping arm cavity. The middle connecting piece is threadedly connected to the upper connecting piece. The piston is movably connected to the upper part of the track rod. The lower part of the track rod is threadedly connected to the pressure sleeve. A spring is placed between the pressure sleeve and the track rod. The track nail seat is placed between the middle connecting piece and the lower connecting piece. The track nail can rotate circumferentially on the track sleeve.

[0022] Further, the lower connecting piece is threadedly connected to the production sleeve. The sealing valve rod is threadedly connected to the track sleeve. The production sleeve is threadedly connected to the lower joint.

[0023] Further, the production sleeve is provided with a plurality of production channels, and the aperture of the production channels increases in a stepped manner from top to bottom.

[0024] Further, a vulcanized body is provided on the surface of the aperture of each production channel on the production sleeve. The sealing valve rod realizes the opening and closing of the production channel.

[0025] Further, the PLC circuit can control the movement of motor one and motor two. Motor one controls the movement of the booster pump, and motor two controls the movement of the pressure relief pump. Pressure relief holes are provided on the inner wall of the pressure relief pump, and balance holes corresponding to the pressure relief holes are provided.

[0026] Further, the multi-parameter tester can measure parameters such as water content, well temperature, and pressure of the oil layer. A plurality of track grooves are provided on the track rod.

[0027] Furthermore, a construction method of an intelligent balanced production string for an oil well includes: the cable provides power to the PLC circuit. The PLC circuit commands motor one, and motor one controls the plunger pump to perform a boosting movement. The hydraulic oil for the boosting movement is provided by the oil storage cavity. The hydraulic oil flows into the piston cavity through one of the three-way connectors. At this time, the one of the three-way connectors connected to the pressure relief pump is sealed. The piston drives the track rod to move. When a position change is required, the PLC circuit commands motor two, and motor two controls the pressure relief pump to move upward. At this time, the one of the three-way connectors connected to the pressure relief pump is opened, and the hydraulic oil can flow into the pressure relief pump. The piston loses support and, under the action of the large-thrust spring, the track rod moves upward, realizing the position change of the track nail on the track rod, thereby realizing different controls of the sealing valve rod on the production channel.

[0028] The beneficial effects of the present invention are: 1. By adopting the method of downhole electric control of the liquid path channel + hydraulic direct push + multi-track design, the rapid adjustment of the flow regulator is realized; 2. By adopting the method of using a motor to control the hydraulic circuit pressurization and rapid pressure relief of the downhole hydraulic circuit, the rapid response of the flow regulator is achieved; 3. By adopting the variable density liquid inlet hole adjustment method, linear adjustment under multiple downhole tracks is achieved; 4. A multi-stage internal vulcanized sealing mechanism is arranged downhole to solve the problem that the sealing element is easily damaged under high pressure. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the intelligent balanced production string of the oil well of the present invention; Figure 2-1 、 2-2 、2-3 are schematic diagrams of the structure of the balanced production tool of the present invention; In the figure: 1. Guide plug, 2. Oil pipe, 3. Balanced production tool, 4. Packer, 5. Sucker rod pump, 6. Cable, 7. Ground control system, 301 coupling, 302 upper central pipe, 303 cable joint, 304 oil storage cavity, 305 external sealing cylinder, 306 PLC circuit, 307, motor 1, 308 motor 2, 309, 309 booster pump, 310 pressure relief pump, 311 tee, 312 hydraulic oil channel, 313 upper connecting piece, 314 piston, 315 middle central pipe, 316 middle connecting piece, 317 track rod, 318 track nail seat, 319 track nail, 320 lower connecting piece, 321 spring, 322 compression sleeve, 323 production sleeve, 324 vulcanized body, 325 sealing valve stem, 326 lower joint. Detailed Embodiments

[0030] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0031] Embodiment 1

[0032] As Figure 1 shown, the present invention adopts the following technical solutions: The balanced production string of the invention includes 1. Guide plug, 2. Oil pipe, 3. Balanced production tool, 4. Layered packer, 5. Sucker rod pump, 6. Cable, 7. Ground control system. The guide plug is located at the lowermost end of the pipe string. The balanced production tool and the layered packer are connected in series through the oil pipe. The layered packer is used to separate each oil layer. The cable is connected to each balanced production tool and can pass through the layered packer and finally connect to the ground control system.

[0033] Among them, the balanced production tool includes a 301 coupling, a 302 upper central pipe, a 303 cable joint, a 304 oil storage cavity, a 305 external sealing cylinder, a 306 PLC circuit, a 307 motor 1, a 308 motor 2, a 309 booster pump, a 310 pressure relief pump, a 311 three-way joint, a 312 hydraulic pipeline, a 313 upper connecting piece, a 314 piston, a 315 middle central pipe, a 316 middle connecting piece, a 317 track rod, a 318 track nail seat, a 319 track nail, a 320 lower connecting piece, a 321 spring, a 322 pressure sleeve, a 323 production sleeve, a 324 vulcanized body, a 325 sealing valve rod, and a 326 lower joint. The upper central pipe is threadedly connected to the coupling, and the external sealing cylinder is threadedly connected to the upper central pipe. The external sealing cylinder and the upper central pipe enclose a cavity, and inside the cavity are armored with an oil storage cavity, a PLC circuit, a motor 1, a motor 2, a booster pump, a pressure relief pump, and a three-way joint. One passage of the three-way joint is connected to the booster pump, one passage is connected to the pressure relief pump, and one passage is connected to the piston, and the connection methods are all through hydraulic pipelines. The oil storage cavity can provide hydraulic oil. The motor 1 can control the movement of the booster pump, and the motor 2 can control the movement of the pressure relief pump. The upper part of the outside of the 302 upper central pipe is threadedly connected to the lower part of the 305 external sealing cylinder. The lower part of the 302 upper central pipe is threadedly connected to the upper part of the 313 upper connecting piece. The 313 upper connecting piece is provided with a clamping arm cavity, and the 314 piston is installed inside the clamping arm cavity. The 316 middle connecting piece is threadedly connected to the 313 upper connecting piece. The 314 piston is movably connected to the upper part of the 317 track rod. The lower part of the 317 track rod is threadedly connected to the pressure sleeve. The spring is placed between the pressure sleeve and the 317 track rod. The 318 track nail seat is placed between the 316 middle connecting piece and the 320 lower connecting piece. The track nail can rotate circumferentially on the track sleeve. The 320 lower connecting piece is threadedly connected to the 323 production sleeve. The sealing valve rod is threadedly connected to the track sleeve. The production sleeve is threadedly connected to the lower joint.

[0034] The production sleeve is provided with a plurality of production channels, and the aperture of the production channels increases in a stepped manner from top to bottom.

[0035] A vulcanized body is provided on the surface of the aperture of each production channel on the production sleeve. The sealing valve rod realizes the opening and closing of the production channel.

[0036] Sealing rings are provided between the 302 and the 305, between the 309 and the 305, between the 310 and the 305, between the 313 and the 302, between the 315 and the 302, between the 313 and the 314, between the 314 and the 315, between the 313 and the 316, and between the 316 and the 320 to play a sealing role.

[0037] The 303 is a special cable interface.

[0038] The 321 spring mentioned above is a large-thrust spring.

[0039] The PLC circuit mentioned above can control the movements of Motor 1 and Motor 2. Motor 1 controls the movement of the booster pump, and Motor 2 controls the movement of the pressure relief pump.

[0040] There are 327 pressure relief small holes provided on the inner wall of the pressure relief pump mentioned above, and 328 balance holes corresponding to the pressure relief small holes are provided on 302.

[0041] The multi-parameter tester mentioned above can measure parameters such as water content, well temperature, and pressure of the oil layer.

[0042] There are multiple track grooves provided on the track rod mentioned above.

[0043] Embodiment 2

[0044] 1. When a certain layer needs to produce with a certain flow rate, the PLC circuit controls the plunger of the booster pump to pressurize. The hydraulic oil in the oil storage cavity enters the piston cavity through the tee, pushing the piston to move downward, thereby driving the track rod to move. Since the lengths of the tracks on the track rod are different, the opening degrees of the production channels controlled by the sealing valves connected to the track rod are different. When track transposition is required, the PLC circuit controls Motor 2, and Motor 2 controls the plunger of the pressure relief pump to move upward. The hydraulic oil flows into the pressure relief pump, realizing the rapid release of the internal high pressure. At the same time, under the action of the large-thrust spring, the sealing valve rod and the track rod move upward, and the piston returns to the initial position. When it is necessary to close this layer, the valve rod is at the lowest end. The higher the valve rod is, the more liquid inlet holes there are, and the flow rate becomes larger and larger. By controlling the opening degrees of the valve rods of each layer through the ground control system, the balanced production of each layer can be achieved.

[0045] During construction, in accordance with Figure 1 as shown, the guide plug, the balanced production tool, the packer, and the oil production pump are successively lowered to the required positions, and finally connected to the ground control system with a cable; When the upper and lower layers are produced jointly, the water content of the produced fluid can be measured by the method of analyzing the produced fluid on the ground. If the water content is relatively high, the ground control system can send a command to close the lower layer. Then the PLC circuit of this layer will command the motor to control the movement of the piston to close all the production channels of this layer. The ground control system sends a command to open the upper layer, and the upper oil layer produces. By analyzing the water content of the upper oil layer, the water content situation of this layer can be determined. If the water content of this layer is high, the upper layer can be closed and the lower layer can be produced.

[0046] When producing oil from three or more layers, the actual water content situations of each layer can be analyzed to determine the layer(s) to be produced, so as to achieve the production of a single layer or multiple layers jointly.

[0047] Furthermore, multi-parameter testers can be connected in series at each production layer. The multi-parameter testers can measure parameters such as water cut, temperature, and pressure. Since the multi-parameter tester is a commonly used instrument, it will not be elaborated in this invention patent. After integrating the multi-parameter tester, the balanced production string can achieve intelligent balanced production. When the ground control system retrieves that the water cut value is the set threshold value, it can automatically adjust the opening degree of the balanced production tools for each layer, thereby achieving balanced production for each layer.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An intelligent balanced production string for oil wells, characterized in that: It includes a guide wire plug, an oil pipe, a balanced production tool, a stratified packer, a pump, a cable and a ground control system; the guide wire plug is located at the bottom of the pipe string, the balanced production tool and the stratified packer are connected in series through the oil pipe, the stratified packer is used to separate the oil layers, the cable connects each balanced production tool and can pass through the stratified packer, and finally connects to the ground control system.

2. The intelligent balanced production string for oil wells according to claim 1, characterized in that: The balanced production tool includes a coupling, an upper center pipe, a cable joint, an oil storage chamber, an external sealing cylinder, a PLC circuit, a motor 1, a motor 2, a booster pump, a pressure relief pump, a tee, a hydraulic pipeline, an upper connecting piece, a piston, a middle center pipe, a middle connecting piece, a track rod, a track nail seat, a track nail, a lower connecting piece, a spring, a compression sleeve, a production sleeve, a vulcanized body, a sealing valve stem, and a lower joint.

3. The intelligent balanced production string for oil wells according to claim 2, characterized in that: The upper center tube and the coupling are threadedly connected, the external sealing tube is threadedly connected to the upper center tube, the external sealing tube and the upper center tube form a cavity, the cavity is armored with an oil storage cavity, PLC circuit, motor 1, motor 2, booster pump, pressure relief pump, tee, one of the tee is connected to the booster pump, one is connected to the pressure relief pump, and one is connected to the piston, and the connection method is through a hydraulic pipeline.

4. The intelligent balanced production string for oil wells according to claim 3, characterized in that: The oil storage chamber can provide hydraulic oil, the motor 1 can control the movement of the boost pump, and the motor 2 can control the movement of the pressure relief pump. The upper outer side of the upper center tube is threadedly connected to the lower outer sealing tube, and the lower upper center tube is threadedly connected to the upper upper connecting piece. The upper connecting piece is provided with a clamping arm cavity, and a piston is installed in the clamping arm cavity. The middle connecting piece is threadedly connected to the upper connecting piece, and the piston is movably connected to the upper part of the track rod. The lower part of the track rod is threadedly connected to the pressing sleeve, and the spring is placed between the pressing sleeve and the track rod. The track nail seat is placed between the middle connecting piece and the lower connecting piece, and the track nail can rotate along the circumference on the track sleeve.

5. The intelligent balanced production string for oil wells according to claim 4, characterized in that: The lower connecting piece is threadedly connected to the production sleeve, the sealing valve stem is threadedly connected to the track sleeve, and the production sleeve is threadedly connected to the lower joint.

6. The intelligent balanced production string for oil wells according to claim 5, characterized in that: The production sleeve is provided with a plurality of production channels, and the apertures of the production channels increase in a step-like manner from top to bottom.

7. The intelligent balanced production string for oil wells according to claim 6, characterized in that: Each production channel aperture surface on the production sleeve is provided with a vulcanized body. The sealing valve stem realizes the opening and closing of the production channel.

8. The intelligent balanced production string for oil wells according to claim 7, characterized in that: The PLC circuit described can control the movement of motor one and motor two, motor one controls the movement of the booster pump, and motor two controls the movement of the pressure relief pump; a pressure relief hole is arranged on the inner wall of the pressure relief pump, and a balancing hole corresponding to the pressure relief hole is arranged on the upper wall.

9. The intelligent balanced production string for oil wells according to claim 8, characterized in that: The multi-parameter tester can measure parameters such as water content, well temperature, pressure, etc. of the oil layer; a plurality of track grooves are arranged on the track rod.

10. A construction method for an intelligent balanced production string for an oil well as claimed in any one of claims 1 to 9, characterized in that: include: The cable provides power to the PLC circuit, and the PLC circuit directs motor one, and motor one controls the plunger pump to perform a boosting movement. The hydraulic oil for the boosting movement is provided by the oil storage chamber, and the hydraulic oil flows into the piston chamber through one of the three-way connections. At this time, the one of the three-way connections connected to the pressure relief pump is closed; the piston drives the track rod to move, and when it is necessary to change position, the PLC circuit directs motor two, and motor two controls the pressure relief pump to move upward. At this time, the one connected to the pressure relief pump is opened, and the hydraulic oil can flow into the pressure relief pump, and the piston loses support. Under the action of the large thrust spring, the track rod moves upward, realizing the displacement of the track nails on the track rod, thereby realizing different controls of the sealing valve stem on the production channel.

Images