Wireless Control-based Well Logging Layered Production Testing System and Implementation Method

Abstract

The present invention relates to the technical field of stratified production testing for exploration wells, and more specifically to a stratified production testing system and implementation method for exploration wells based on wireless control. In this production testing system, a wireless controller is placed at the oil production wellhead to control the opening and closing of intelligent switchers for each layer. The intelligent switch valve uses well fluid pressure to achieve the opening and closing actions and continuously maintains the power source for opening and closing. It is applicable to the production testing of exploration wells in open-hole wells and cased wells. This production testing system has a simple process, accurate separate control of liquid production from production layers, and can achieve seal testing between production layers. The method includes the following steps: Step 1, lower the mechanical switch valve in the open state into the production testing string; Step 2, pump steel balls into the tubing at the wellhead. The steel balls push the inner valve sleeve of the mechanical switch valve to close the valve. Continue to pressurize with the pump truck, and the packers for each production layer are set to achieve sealing between production layers; Step 3, place a wireless controller in the tubing at the wellhead and sequentially control the opening and closing of the intelligent switchers for each layer for production testing.

Description

[0001] The present invention relates to the technical field of well logging and layered production testing, and more specifically to a well logging and layered production testing system and implementation method based on wireless control. Background Art

[0002] With the continuous development of oil exploration and production technologies, the challenges faced by downhole operations are also increasing. Among them, well logging and oil testing is an essential link in the exploration process and plays a crucial role in improving oil production efficiency. However, during the well logging and oil testing process, volatile oils will dissolve in the drilling fluid, resulting in too low oil concentration, thus affecting the oil testing effect. To solve this problem, people have begun to explore the supporting technologies for continuous well logging and fluid drainage during well logging to improve the measurement accuracy and oil testing efficiency.

[0003] Conventional well logging uses general production testing, and the production fluid conditions of each layer are judged vaguely. Especially for wells with a large number of layers, the construction process is complex, the operation frequency of the wellhead pump truck is high, the construction period is long, and the cost is relatively high. Summary of the Invention

[0004] The present invention provides a well logging and layered production testing system and implementation method based on wireless control, and the purpose is achieved through the following technical solutions:

[0005] A wireless controller includes a guiding seat. The upper end of the guiding seat is detachably connected with an adapter. The upper end of the adapter is detachably connected with a tail seat. Each of the end faces of the guiding seat and the tail seat facing each other is provided with a positioning groove. A protective tube is sleeved on the adapter. There is a spacing between the protective tube and the adapter. The two ends of the adapter are respectively inserted into the two positioning grooves. A permanent magnetic core is provided between the protective tube and the adapter.

[0006] A mechanical switch valve includes a female threaded joint. The upper end of the female threaded joint is detachably connected with an adapter seat. The upper end of the adapter seat is detachably connected with a male threaded joint. A third channel is formed among the female threaded joint, the adapter seat and the valve sleeve. A valve sleeve is slidably fitted in the central holes of the female threaded joint and the adapter seat. A valve sleeve convex part is fixedly connected to the outer wall of the valve sleeve. The outer convex part of the valve sleeve is slidably fitted in the third channel. The inner walls of the female threaded joint and the male threaded joint both have reduced diameter sections to form shoulders. A radial through port communicating with the inside of the adapter seat itself is provided on the adapter seat. The valve sleeve can close the radial through port. A valve sleeve inner convex part is fixedly connected to the inner wall of the valve sleeve.

[0007] An intelligent switch includes a lower joint. An upper part inside the lower joint is inserted with a first-stage valve body. A first-stage valve body convex part is fixedly connected to the outer wall of the first-stage valve body. The upper part of the lower joint is detachably connected with a valve seat. The first-stage valve body is slidably fitted in the central hole of the valve seat. A first channel is formed between the lower joint and the valve seat. The first-stage valve body convex part is fitted in the first channel. A liquid passing hole is provided on the valve seat. When the first-stage valve body convex part is located at the top of the first channel, the first-stage valve body blocks the liquid passing hole at this time. When the first-stage valve body moves downward until it disengages from the liquid passing hole, the liquid passing hole is opened. A valve seat flow channel is provided on the valve seat. When the first-stage valve body convex part is located at the top of the first channel, the first-stage valve body convex part is located at the bottom of the valve seat flow channel. A positioning ring groove is provided on the outer wall of the valve seat. The positioning ring groove is located on the upper side of the liquid passing hole. A pull ring fixedly connected to the valve seat and clamped in the positioning ring groove. The upper end of the pull ring is detachably connected with a body housing. The upper end of the body housing is detachably provided with a fixing seat. A positioning hole is provided at the upper end of the valve seat. A positioning hole is provided at the lower end of the fixing seat. A pressure transmission and limiting tube is provided between the valve seat and the fixing seat. The upper and lower ends of the pressure transmission and limiting tube are respectively inserted in the two positioning holes. The upper end of the fixing seat is detachably provided with an electric cavity housing. The upper end of the electric cavity housing is detachably connected with an upper joint. A second-stage valve body is provided at the upper end of the first-stage valve body. A second-stage valve body convex part is fixedly connected to the outer wall of the second-stage valve body. The second-stage valve body is slidably fitted in the central holes of the valve seat and the fixing seat. A second channel is formed among the valve seat, the body housing and the fixing seat. The second-stage valve body convex part is slidably fitted in the second channel. An amplification ring is provided in the second channel. The amplification ring is located between the second-stage valve body convex part and the fixing seat. A central tube is provided at the upper end of the second-stage valve body. A shoulder is provided at the upper end of the inner wall of the fixing seat. A shoulder is provided at the lower end of the inner wall of the upper joint. The central tube is clamped in the two shoulders. When the first-stage valve body moves to the upper maximum stroke position, the first-stage valve body, the second-stage valve body and the central tube abut against each other. A cavity is formed among the fixing seat, the electric cavity housing, the central tube and the upper joint. A battery pack, a control system, a first pilot valve and a second pilot valve are provided in the cavity. The battery pack provides electrical energy for the control system, the first pilot valve and the second pilot valve. The control system can detect magnetic signals. A pilot positioning rod is installed at the lower end of each of the first pilot valve and the second pilot valve.

[0008] Wherein, a fixing seat ring groove opening is provided on the inner wall of the fixing seat. The fixing seat ring groove opening communicates with the pilot positioning rod installation cavity. The second-stage valve body and the central tube are butted at the central positioning hole of the fixing seat. A butting liquid inlet groove opening is provided at the butting surface between the central tube and the second-stage valve body. The pilot positioning rod is placed in the fixing seat. Sealing rings are provided on the upper and lower sides of the pilot positioning rod. The sealing diameter on the lower side of the pilot positioning rod is smaller than the sealing diameter on the upper side.

[0009] The control system can perform program setting and can control the first pilot valve and the second pilot valve to trigger with a delay.

[0010] The circumferential width of the butting liquid inlet groove opening is 0.3 mm and the depth is 0.3 mm.

[0011] Among them, the first pilot valve and the second pilot valve are electrically controlled actuators. In the initial state, the first pilot valve and the second pilot valve are in the extended state, and the push rods of the first pilot valve and the second pilot valve extend to limit the upward displacement of the pilot positioning rod; when the push rods of the first pilot valve and the second pilot valve retract, under the action of the continuous well fluid pressure, the pilot positioning rod moves upward with the corresponding first pilot valve or second pilot valve.

[0012] A first reverse buckle structure is arranged on the outer wall of the convex part of the secondary valve body, and a second reverse buckle structure is arranged on the inner wall of the body shell. The second reverse buckle structure is located in the second channel. The first reverse buckle structure and the second reverse buckle structure are one-way reverse buckle buttress thread locking structures. When the first reverse buckle structure moves downward and approaches the second reverse buckle structure, the first reverse buckle structure can enter the second reverse buckle structure. At this time, if the first reverse buckle structure moves upward, the first reverse buckle structure and the second reverse buckle structure are locked.

[0013] A locking groove mechanical closing device is arranged on the central channel of the secondary valve body. When it is impossible to close the valve due to sand jamming, scaling, wax deposition or seal failure in the well, a bridge plug is lowered from the wellhead. When the bridge plug passes through the central passage of the intelligent switch secondary valve body, the bridge plug expands and locks onto the locking groove of the central passage of the secondary valve body. With the continuous pressurization of the wellhead, the secondary valve body is driven to move downward to achieve mechanical forced valve closing.

[0014] A well exploration layered production testing system based on wireless control includes a tubing string, and a nipple, a mechanical switch valve, a plurality of intelligent switchers, a safety joint and a wellhead device that are sequentially connected from bottom to top through the tubing string, and a packer connected to the tubing string is arranged between any two adjacent intelligent switchers.

[0015] A well exploration layered production testing method based on wireless control includes the following steps:

[0016] Step 1: The mechanical switch valve in the production testing string is opened and lowered into the well.

[0017] Step 2: Steel balls are pumped into the tubing string at the wellhead. The steel balls push the inner valve sleeve of the mechanical switch valve to perform the valve closing action, and the pump truck continues to pressurize. The packers of each production layer are set, and isolation between each production layer is achieved.

[0018] Step 3: A wireless controller is placed into the tubing string at the wellhead to sequentially control the opening and closing of each layer of intelligent switchers for production testing.

[0019] The beneficial effects of the well exploration layered production testing system and implementation method based on wireless control of the present invention are:

[0020] In this trial production system, a wireless controller is placed at the oil production wellhead to control the opening and closing of intelligent switches for each layer. The intelligent switch valve uses the well fluid pressure to achieve the opening and closing actions and continuously maintains the switching power source. It is applicable to the exploration and trial production of open-hole wells and cased wells. This trial production system has a simple process, accurate separate control of the produced fluid from each production layer, and can achieve the verification of the sealing between production layers. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of a stratified exploration and trial production system for exploration wells based on wireless control;

[0022] Figure 2 It is a schematic diagram of the wireless controller;

[0023] Figure 3 It is a schematic diagram of the second embodiment of the intelligent switch;

[0024] Figure 4 It is a schematic diagram of the second embodiment of the guide seat;

[0025] Figure 5 It is a schematic diagram of the intelligent switch;

[0026] Figure 6 It is Figure 5 The enlarged view at position A in

[0027] Figure 7 It is a schematic diagram of the central pipe;

[0028] Figure 8 It is Figure 5 The enlarged view at position B in

[0029] Figure 9 It is a schematic diagram of the intelligent switch opening the valve;

[0030] Figure 10 It is a schematic diagram of the intelligent switch closing the valve;

[0031] Figure 11 It is a schematic diagram of the wireless controller;

[0032] Figure 12 It is a schematic diagram of the mechanical switch valve;

[0033] Figure 13 and 14 It is a schematic diagram of the control principle diagram and strategy of the intelligent switch.

[0034] In the figure: 1. Lower joint; 2. First-stage valve body; 3. Valve seat; 3a. Liquid passing hole; 3b. Valve seat flow channel; 4. Pull ring; 5. Second-stage valve body; 6. Pressure transmission limiting tube; 7. Body shell; 8. Force-increasing ring; 9. Fixed seat; 9a. Fixed seat ring notch; 10. Pilot positioning rod; 11. First pilot valve; 12. Electric cavity shell; 13. Battery pack; 14. Central tube; 15. Control system; 16. Upper joint; 17. Second pilot valve; 18. Male threaded joint; 19. Adapter seat; 20. Valve sleeve; 21. Female threaded joint; 22. Steel ball; 23. Guide seat; 23a. Sand cleaning groove; 23b. Inclined channel; 24. Protection tube; 25. Magnetic core; 26. Adapter; 27. Tail seat. Detailed implementation mode

[0035] The well logging layered production testing system based on wireless control includes a wellhead device installed at the wellhead and a wireless controller. The wellhead device is used to meet the wellhead pump truck operation for testing sealing and the delivery of the wireless controller and the steel ball 22.

[0036] Among them, referring to Figures 1 to 4 , the wireless controller includes: a guide seat 23. The upper end of the guide seat 23 is threadedly connected to an adapter 26 through a thread pair. The upper end of the adapter 26 is threadedly connected to a tail seat 27 through a thread pair. A positioning groove is provided on each of the end faces of the guide seat 23 and the tail seat 27 facing each other. A protection tube 24 is sleeved on the adapter 26. There is a gap between the protection tube 24 and the adapter 26. The two ends of the adapter 26 are respectively inserted into the two positioning grooves. A permanent magnetic core 25 is provided between the protection tube 24 and the adapter 26. The magnetic core 25 can provide a magnetic signal. The guide seat 23, the protection tube 24 and the tail seat 27 form the wireless controller housing. The overall structure of the wireless controller housing is cylindrical, and the lower end of the wireless controller housing is an arc end. The upper edge of the wireless controller housing is a chamfered surface.

[0037] Preferably, all the structures of the wireless controller are coaxially arranged. A sand cleaning groove 23a is provided on the outer surface of the guide seat 23. The axis of the guide seat 23 passes through the lower end of the sand cleaning groove 23a. An over-flow channel is formed on the axis of the right part of the guide seat 23, the adapter 26 and the tail seat 27. An inclined channel 23b communicating with the sand cleaning groove 23a is provided on the guide seat 23. The inclined channel 23b communicates with the over-flow channel. When it is delivered in the wellhead oil pipe, the resistance of the liquid to the wireless controller during the lowering in the oil pipe can be reduced. When the wireless controller is sand jammed in the oil pipe, it can be pumped through the wellhead. When the liquid enters through the over-flow channel in the wireless controller and sprays out through the sand cleaning groove 23a and the inclined channel 23b, the sand jammed position can be sand cleaned, ensuring that the wireless controller can effectively and quickly pass through the intelligent switch valve and ensuring the effective transmission of the control signal.

[0038] It also includes an oil pipe and a safety joint fixedly connected to the upper side of the oil pipe. After the tests of all production layers in the whole well are completed, the oil pipe above the safety joint can be removed, thereby reducing the trial production cost of a single well;

[0039] It also includes a packer for isolating each production layer;

[0040] Combined Figures 5 to 10, further comprising an intelligent switch, the intelligent switch includes a lower joint 1, the upper part of the central hole of the lower joint 1 is inserted and fitted with a first-stage valve body 2, the outer wall of the first-stage valve body 2 is fixedly connected with a first-stage valve body convex part, the upper part of the lower joint 1 is threadedly connected with a valve seat 3 through a thread pair, the first-stage valve body 2 is slidably fitted in the central hole of the valve seat 3, a first channel is formed between the lower joint 1 and the valve seat 3, and the first-stage valve body convex part is fitted in the first channel, so that the first-stage valve body 2 can slide along the axis of the valve seat 3. The valve seat 3 is provided with a liquid passing hole 3a. When the first-stage valve body convex part is located at the top of the first channel, the first-stage valve body 2 plugs the liquid passing hole 3a at this time, and the liquid passing hole 3a is closed. When the first-stage valve body 2 moves downward until it disengages from the liquid passing hole 3a, the liquid passing hole 3a is opened; the valve seat 3 is provided with a valve seat flow channel 3b. When the first-stage valve body convex part is located at the top of the first channel, the first-stage valve body convex part is located at the bottom of the valve seat flow channel 3b. A positioning ring groove is provided on the outer wall of the valve seat 3, and the positioning ring groove is located on the upper side of the liquid passing hole 3a. A pull ring 4 fixedly connected to the valve seat 3 and clamped in the positioning ring groove is provided on the valve seat 3. The upper end of the pull ring 4 is threadedly connected with a body housing 7 through a thread pair, and the upper end of the body housing 7 is threadedly connected with a fixing seat 9 through a thread pair. A positioning hole is provided at the upper end of the valve seat 3, and a positioning hole is provided at the lower end of the fixing seat 9. A pressure transmission limiting pipe 6 is provided between the valve seat 3 and the fixing seat 9, and the upper and lower ends of the pressure transmission limiting pipe 6 are respectively inserted into the two positioning holes; the upper end of the fixing seat 9 is threadedly connected with an electric cavity housing 12 through a thread pair, and the upper end of the electric cavity housing 12 is threadedly connected with an upper joint 16 through a thread pair; a second-stage valve body 5 is provided at the upper end of the first-stage valve body 2, the outer wall of the second-stage valve body 5 is fixedly connected with a second-stage valve body convex part, the second-stage valve body 5 is slidably fitted in the central holes of the valve seat 3 and the fixing seat 9, a second channel is formed between the valve seat 3, the body housing 7 and the fixing seat 9, and the second-stage valve body convex part is slidably fitted in the second channel. An intensifying ring 8 is provided in the second channel, and the intensifying ring 8 is located between the second-stage valve body convex part and the fixing seat 9. A central tube 14 is provided at the upper end of the second-stage valve body 5. A shoulder is provided at the upper end of the inner wall of the fixing seat 9, and a shoulder is provided at the lower end of the inner wall of the upper joint 16. The central tube 14 is clamped between the two shoulders. When the first-stage valve body 2 moves to the upper maximum stroke position, the first-stage valve body 2, the second-stage valve body 5 and the central tube 14 abut against each other; the minimum inner diameters of the lower joint 1, the first-stage valve body 2, the second-stage valve body 5, the central tube 14 and the upper joint 16 are the same, forming a through diameter; a cavity is formed between the fixing seat 9, the electric cavity housing 12, the central tube 14 and the upper joint 16, and a battery pack 13, a control system 15, a first pilot valve 11 and a second pilot valve 17 are provided in the cavity; the battery pack 13 provides electrical energy for the control system 15, the first pilot valve 11 and the second pilot valve 17. The control system 15 can perform program setting and can control the first pilot valve 11 and the second pilot valve 17 to trigger with a time delay. Among them, the control system 15 can detect the magnetic signal in the oil pipe, and through the recognition of the magnetic signal, analyze and form a control for the first pilot valve 11 and the second pilot valve 17. A pilot positioning rod 10 is installed at the lower end of each of the first pilot valve 11 and the second pilot valve 17;

[0041] Among them, a fixing seat ring groove opening 9a is provided on the inner wall of the fixing seat 9, and the fixing seat ring groove opening 9a is communicated with the installation cavity of the pilot positioning rod 10; the secondary valve body 5 and the central pipe 14 are butted at the central positioning hole of the fixing seat 9. Among them, a butting liquid inlet groove opening with a circumferential width of 0.3 mm and a depth of 0.3 mm is provided on the butting surface of the central pipe 14 and the secondary valve body 5. The butting liquid inlet groove opening has a sand prevention function, preventing sand from accumulating in the installation sealing cavity between the pilot positioning rod 10 and the fixing seat 9, and improving the reliability of the movement of the pilot positioning rod 10.

[0042] Among them, the pilot positioning rod 10 is placed in the fixing seat 9. Sealing rings are provided on both the lower and upper sides of the pilot positioning rod 10. The sealing diameter on the lower side of the pilot positioning rod 10 is smaller than the sealing diameter on the upper side. When well fluid enters the cavity formed by the pilot rod 10 through the fixing seat ring groove opening 9a, the pressure-bearing areas at the upper and lower ends of the pilot positioning rod 10 are different. The pressure-bearing area at the lower end is smaller than the pressure-bearing area at the upper end. Under the continuous action of the downhole liquid, the pilot positioning rod 10 continuously maintains a force moving upward.

[0043] The large-diameter tail parts on the upper sides of the two pilot positioning rods 10 are respectively connected to the first pilot valve 11 and the second pilot valve 17. Among them, the first pilot valve 11 and the second pilot valve 17 are electric control actuators of the telescopic cylinder type. In the initial state, the first pilot valve 11 and the second pilot valve 17 are in the extended state, and the push rods of the first pilot valve 11 and the second pilot valve 17 extend to limit the upward displacement of the pilot positioning rod 10; when the push rods of the first pilot valve 11 and the second pilot valve 17 retract, the pilot positioning rod 10 moves upward with the corresponding first pilot valve 11 or second pilot valve 17 under the action of the continuous well fluid pressure;

[0044] The control system 15 in the intelligent switch can set a delay trigger mode, and at the same time, the delay duration can be controlled. When the first pilot valve 11 executes retraction, the intelligent switch performs an open valve action; at the same time, the second pilot valve 17 is triggered with a delay. When the second pilot valve 17 is triggered to retract, the intelligent switch performs a close valve action;

[0045] Specifically, when the intelligent switch is lowered into the well, the first pilot valve 11 and the second pilot valve 17 are both in the extended state, that is, the intelligent switch is in the valve-closed state. The upper end of the pilot positioning rod 10 connected to the first pilot valve 11 blocks the top of the central channel of the pressure transmission limiting pipe 6; when the wireless controller is placed in the wellhead casing and passes through the intelligent switch, the control system 15 performs signal detection. When the corresponding execution signal is detected, the control system 15 triggers the first pilot valve 11 to execute. The push rod of the first pilot valve 11 retracts. At this time, the pilot positioning rod 10 restricted by the first pilot valve 11 displaces upward under the action of the well fluid pressure, and the seal on the lower side of the pilot positioning rod 10 fails, and a liquid inlet channel is formed on the lower side of the pilot positioning rod 10; at this time, the liquid inlet channel on the lower side of the pilot rod 10 from top to bottom, the central channel of the pressure transmission limiting pipe 6 and the valve seat flow channel 3b form a complete flow channel. The well fluid enters the cavity where the pilot positioning rod 10 is located through the fixing seat ring notch 9a, and pushes the convex part of the first-stage valve body downward through the complete flow channel, so that the convex part of the first-stage valve body drives the first-stage valve body 2 to move downward. At this time, the liquid passing hole 3a blocked by the first-stage valve body 2 is opened, and the intelligent switch is in the valve-open state; a sealing ring structure is provided on both the upper and lower sides of the first-stage valve body 2. When the upper side of the first-stage valve body 2 maintains pressure continuously with the well fluid, the first-stage valve body 2 maintains a continuous downward force; to prevent misoperation of valve closing caused by scraping the first-stage valve body 2 when other operation tools are lifted and lowered during other operations in the casing.

[0046] After the first pilot valve 11 is executed, the control system 15 controls the second pilot valve 17 to delay the start of the pilot positioning rod 10 connected to itself. When the second pilot valve 17 is triggered, the push rod of the second pilot valve 17 retracts. After the pilot positioning rod 10 restricted by the second pilot valve 17 is subjected to the pressure of the well fluid, it moves upward to the large diameter side. At this time, the seal at the small diameter on the lower side of the pilot positioning rod 10 fails, and a liquid passing channel is formed on the lower side. When the well fluid enters the cavity of the pilot positioning rod 10 through the fixing seat ring notch 9a and then enters the cavity formed by the force increasing ring 8, the second-stage valve body 5, the body shell 7, and the fixing seat 9 through the lower side of the pilot positioning rod 10. The lower side of the force increasing ring 8 is a sealed cavity. When subjected to the downward pressure of the well fluid, the force increasing ring 8 drives the second-stage valve body 5 to move downward. When the second-stage valve body 5 moves downward to block the liquid passing hole 3a of the valve seat 3, the intelligent switch valve is in the valve-closed state.

[0047] On the outer wall of the convex part of the secondary valve body, a first reverse buckle structure 5a is provided. On the inner wall of the main body housing 7, a second reverse buckle structure 7a is provided. The second reverse buckle structure 7a is located within the second channel. The first reverse buckle structure 5a and the second reverse buckle structure 7a are one-way reverse buckle horse tooth thread locking structures. After the first reverse buckle structure 5a moves downward and approaches the second reverse buckle structure 7a, the first reverse buckle structure 5a can enter the second reverse buckle structure 7a. At this time, if the first reverse buckle structure 5a moves upward, the first reverse buckle structure 5a and the second reverse buckle structure 7a will be locked, so as to form a self-locking device when the secondary valve body 5 performs the valve closing action, ensuring the reliability and stability of the intelligent switcher for valve closing.

[0048] In the intelligent switcher, a locking groove mechanical closing device is provided on the central channel of the secondary valve body 5. When it is impossible to close the valve due to sand jamming, scaling, wax deposition or seal failure in the well, a bridge plug can be lowered from the wellhead. When the bridge plug passes through the central passage of the secondary valve body 5 of the intelligent switcher, the bridge plug expands and locks onto the locking groove of the central passage of the secondary valve body 5. Along with the continuous pressurization of the wellhead, it drives the secondary valve body 5 to move downward to achieve mechanical forced valve closing.

[0049] When the wireless controller passes through the internal central channel of the intelligent switcher, the control system 15 inside the intelligent switcher identifies the magnetic signal of the magnetic core 25 and then generates an action instruction for the corresponding layer through internal program parsing.

[0050] It also includes a mechanical switch valve. Figure 12 The mechanical switch valve includes a female coupling joint 18. The upper end of the female coupling joint 18 is threadedly connected to an adapter seat 19 through a thread pair. The upper end of the adapter seat 19 is threadedly connected to a female coupling joint 21 through a thread pair. A third channel is formed between the male coupling joint 18, the adapter seat 19 and the valve sleeve 20. A valve sleeve 20 is slidably fitted in the central holes of the male coupling joint 18 and the adapter seat 19. A valve sleeve convex part is fixedly connected to the outer wall of the valve sleeve 20. The outer convex part of the valve sleeve slides in the third channel. The inner walls of the female coupling joint 18 and the male coupling joint 21 both have reduced diameter sections to form shoulders, thereby restricting the maximum stroke of the valve sleeve 20. A radial through port that is in communication with its own interior is provided on the adapter seat 19. The valve sleeve 20 can close the radial through port to achieve valve closing. When the valve sleeve 20 moves downward, the radial through port opens to achieve valve opening. A valve sleeve inner convex part is fixedly connected to the inner wall of the valve sleeve 20. The top of the valve sleeve inner convex part is used to block a steel ball 22, and the steel ball 22 is dropped from the wellhead tubing.

[0051] Using the above-mentioned production testing method for the exploration well layered production testing system based on wireless control, taking the example of the implementation of four-layer production testing. Figure 11 and Figure 13 It includes the following steps:

[0052] Step 1. Before construction, set the switcher program. Combine the well conditions to set program parameters such as horizons, number of detection signals, and delay duration. Then, along with lowering the pipe string, connect a plug, a mechanical switch valve, several intelligent switchers, a safety joint, and a wellhead device from bottom to top through the production test tubing. And set a packer between any two adjacent intelligent switchers; open the mechanical switch valve in the production test string, and lower the well with the intelligent switchers of each layer closed.

[0053] Step 2. Pump a steel ball 22 into the wellhead tubing. The steel ball 22 pushes the inner valve sleeve 20 in the mechanical switch valve to close the valve. Continue to pressurize with the pump truck, and the packers of each production layer are set, realizing isolation between each production layer.

[0054] Step 3. When 1 wireless controller is placed in the wellhead tubing, the intelligent switchers of each production layer detect the switch magnetic signal once each. When the intelligent switcher of the bottommost layer four detects a magnetic signal once, the intelligent switcher of layer four performs the valve opening action, and the intelligent switchers of the other three layers do not perform any action. At this time, production test of layer four is carried out.

[0055] Step 4. When the production test of layer four ends, send 1 wireless controller into the wellhead again. The intelligent switchers of each production layer detect the switch magnetic signal twice each. At this time, the intelligent switcher of layer four is in the closed state, and the intelligent switcher of layer three performs a delayed valve opening action, and the other two layers have no action; at this time, the entire pipe string is in the closed state of each layer, and the wellhead pump truck can be pressurized to conduct airtight sealing inspection of the packers and intelligent switchers of each layer.

[0056] Step 5. After the sealing inspection ends, the intelligent switcher of layer three performs the valve opening action, and production test of layer three is carried out.

[0057] Step 6. When the production test of layer three ends, send 1 wireless controller into the wellhead again. The intelligent switchers of each production layer detect the switch magnetic signal three times each. At this time, the intelligent switcher of layer three performs the valve closing action, and the intelligent switcher of layer two still performs a delayed valve opening action, and the other layers are all in the closed state. At the same time, airtight sealing inspection of the packers and intelligent switchers of each layer can be carried out.

[0058] Step 7. After the sealing inspection ends, the intelligent switcher of layer two performs the valve opening action, and production test of layer two is carried out.

[0059] Step 8. When the production test of layer two ends, send 1 wireless controller into the wellhead again. The intelligent switchers of each production layer detect the switch magnetic signal four times each. At this time, the intelligent switcher of layer two performs the valve closing action, and the intelligent switcher of layer one still performs a delayed valve opening action, and the other layers are all in the closed state. At the same time, airtight sealing inspection of the packers and intelligent switchers of each layer can be carried out.

[0060] Step 9. The intelligent switcher of layer one performs the valve opening action, and production test of layer one is carried out.

Claims

1. An intelligent switch, characterized in that: The cam is provided with a first-stage valve body, and the first-stage valve body is provided with a first-stage valve body protrusion. The first-stage valve body is provided with a first-stage valve body protrusion, and the first-stage valve body is provided with a first-stage valve body protrusion. The first-stage valve body is provided with a first-stage valve body protrusion. The first-stage valve body is provided with a first-stage valve body protrusion. The first-stage valve body is provided with a first-stage valve body protrusion. The first-stage valve body is provided with a first-stage valve body protrusion. The first-stage valve body protrusion ... When the convex part of the first stage valve body is located at the top of the first groove, the convex part of the first stage valve body is located at the bottom of the valve seat flow channel, a positioning ring groove is provided on the outer wall of the valve seat, the positioning ring groove is located on the upper side of the liquid hole, a pull ring fixed in the positioning ring groove is fixed on the valve seat, the upper end of the pull ring is detachably connected with the body shell, the upper end of the body shell is detachably provided with a fixed seat, the upper end of the valve seat is provided with a positioning hole, the lower end of the fixed seat is provided with a positioning hole, a pressure transmission limit tube is provided between the valve seat and the fixed seat, and the upper and lower ends of the pressure transmission limit tube are respectively inserted in the two positioning holes; the fixed seat The upper end of the primary valve body is provided with a detachable electric cavity shell, and the upper end of the electric cavity shell is detachably connected with an upper joint; the upper end of the primary valve body is provided with a secondary valve body, and a secondary valve body convex part is fixedly connected to the outer wall of the secondary valve body, and the secondary valve body is slidably fitted in the center hole of the valve seat and the fixed seat, and a second groove is formed between the valve seat, the main body shell and the fixed seat, and the secondary valve body convex part is slidably fitted in the second groove, and the force amplifying ring is provided in the second groove, and the force amplifying ring is located between the secondary valve body convex part and the fixed seat, and the upper end of the secondary valve body is provided with a center tube, and the upper end of the inner wall of the fixed seat is provided with a shoulder , a shoulder is provided at the lower end of the inner wall of the upper joint, and the center tube is fixed in the two shoulders. When the primary valve body moves to the upper maximum stroke position, the primary valve body, the secondary valve body and the center tube abut against each other; a cavity is formed between the fixed seat, the electric cavity shell, the center tube and the upper joint, and a battery pack, a control system, a first pilot valve and a second pilot valve are arranged in the cavity; the battery pack provides electrical energy for the control system, the first pilot valve and the second pilot valve, and the control system can detect magnetic signals, and a pilot positioning rod is installed at the lower end of each of the first pilot valve and the second pilot valve; A fixing seat ring notch is provided on the inner wall of the fixing seat, and the fixing seat ring notch is connected to the pilot positioning rod installation cavity; the secondary valve body and the center tube are butted at the center positioning hole of the fixing seat, and a butt liquid inlet notch is provided on the butt surface of the center tube and the secondary valve body, and the pilot positioning rod is placed in the fixing seat, and sealing rings are provided on the lower and upper sides of the pilot positioning rod, and the sealing diameter of the lower side of the pilot positioning rod is smaller than the sealing diameter of the upper side; The control system controls the second pilot valve to delay starting the pilot positioning rod connected to itself, and the force amplification ring drives the secondary valve body to move downward. When the secondary valve body moves downward to block the liquid hole of the valve seat, the intelligent switch is in the valve closing state.

2. The intelligent switch according to claim 1, characterized in that: The circumference of the docking liquid inlet slot is 0.3 mm wide and 0.3 mm deep.

3. The intelligent switch according to claim 1, characterized in that: The first pilot valve and the second pilot valve are electrically controlled actuators. In the initial state, the first pilot valve and the second pilot valve are in an extended state, and the push rods of the first pilot valve and the second pilot valve are extended to limit the upward displacement of the pilot positioning rod; when the push rods of the first pilot valve and the second pilot valve are retracted, the pilot positioning rod moves upward with the corresponding first pilot valve or second pilot valve under the action of continuous well fluid pressure.

4. The intelligent switch according to claim 1, characterized in that: A first inverted structure is arranged on the outer wall of the convex part of the secondary valve body, and a second inverted structure is arranged on the inner wall of the main body shell. The second inverted structure is located in the second groove. The first inverted structure and the second inverted structure are one-way inverted thread locking structures. When the first inverted structure moves downward and approaches the second inverted structure, the first inverted structure can enter the second inverted structure. At this time, if the first inverted structure moves upward, the first inverted structure and the second inverted structure are locked.

5. The intelligent switch according to claim 1, characterized in that: A mechanical closing device with a locking groove is provided on the central channel of the secondary valve body. When the valve cannot be closed due to sand jam, scaling, wax deposition or sealing failure in the well, a bridge plug is lowered from the wellhead. When the bridge plug passes through the central channel of the secondary valve body of the intelligent switch, the bridge plug expands and is locked in the locking groove of the central channel of the secondary valve body. With the continuous pressurization of the wellhead, the secondary valve body is driven downward to realize mechanical forced closing of the valve.

6. A well exploration layer test production system based on wireless control, characterized in that: It comprises an oil pipe, and a plug, a mechanical switch valve, an intelligent switch according to any one of claims 1 to 5, a safety joint and a wellhead device connected in sequence from bottom to top through the oil pipe, wherein there are multiple intelligent switches and a packer connected to the oil pipe is arranged between any two adjacent intelligent switches; The mechanical switch valve comprises a female buckle joint, the upper end of the female buckle joint is detachably connected with an adapter seat, the upper end of the adapter seat is detachably connected with a male buckle joint, a third groove is formed between the female buckle joint, the adapter seat and the valve sleeve, a valve sleeve is slidably fitted in the central hole of the female buckle joint and the adapter seat, a valve sleeve convex portion is fixedly connected to the outer wall of the valve sleeve, the outer convex portion of the valve sleeve is slidably fitted in the third groove, the inner walls of the female buckle joint and the male buckle joint are both provided with a reduced diameter section to form a shoulder, the adapter seat is provided with a radial opening communicated with the interior thereof, the valve sleeve can close the radial opening, and the inner wall of the valve sleeve is fixedly connected with the inner convex portion of the valve sleeve; It also includes a wireless controller, which includes a guide seat, the upper end of the guide seat is detachably connected to a converter, the upper end of the converter is detachably connected to a tailstock, a positioning groove is respectively arranged on the facing end faces of the guide seat and the tailstock, a protective tube is sleeved on the converter, a distance is provided between the protective tube and the converter, two ends of the converter are respectively inserted into the two positioning grooves, and a permanent magnetic core is arranged between the protective tube and the converter.

7. A method for stratified production of exploration wells based on wireless control, characterized in that: The use of the wireless control-based stratified production test system for exploration wells according to claim 6 comprises the following steps: Step 1: Open the mechanical switch valve in the test production string and lower it into the well; Step 2: Pump a steel ball into the wellhead tubing, and the steel ball pushes the valve sleeve in the mechanical switch valve to close the valve. Continue to pressurize the pump truck, and the packers of each production layer are set to achieve isolation between the production layers. Step 3: Place a wireless controller in the wellhead oil pipe to control the intelligent switches on and off at each layer in turn for trial production.

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