Exploratory well layered pilot production system based on wireless control and implementation method

Abstract

The invention relates to the technical field of exploratory well layering pilot production, in particular to an exploratory well layering pilot production system based on wireless control and an implementation method. According to the pilot production system, a wireless controller is put in an oil extraction wellhead to control on-off of each layer of intelligent switch, the intelligent switch valve realizes on-off action by utilizing well liquid pressure, and a switch power source is kept for a long time. The exploratory well pilot production system is suitable for exploratory well pilot production of an open hole well and a cased well, the pilot production system is simple in process and accurate in separate control of production liquid of production layers, and seal examination between the production layers can be achieved. The method comprises the following steps that firstly, a mechanical switch valve in a pilot production pipe column is opened and descends into a well; step 2, pumping a steel ball in the wellhead oil pipe, pushing a valve sleeve in a mechanical switch valve to perform valve closing action by the steel ball, continuing to pressurize the pump truck, setting packers of all production layers, and realizing packing among the production layers; and 3, a wireless controller is put in a wellhead oil pipe, and the intelligent switches of all the layers are sequentially controlled to be switched on and switched off for pilot production.

Description

Technical Field

[0001] The invention relates to the technical field of stratified production test for exploration wells, and more specifically to a stratified production test system for exploration wells based on wireless control and an implementation method thereof. Background Art

[0002] With the continuous development of oil exploration and production technology, the challenges faced by underground operations are becoming increasingly greater. Among them, exploratory well oil testing is an indispensable part of the exploration process and plays a vital role in improving oil production efficiency. However, during the exploratory well oil testing process, volatile oil products will dissolve in the drilling fluid, resulting in too low oil concentration, thus affecting the oil testing effect. To solve this problem, people began to explore the supporting technology of continuous oil testing and drainage in exploratory wells to improve measurement accuracy and oil testing efficiency.

[0003] Conventional exploratory wells use a general test production method, and the judgment of the fluid production situation of each layer is vague. In particular, the construction process of wells with a large number of layers is complicated, the frequency of wellhead pump truck operations is high, the construction period is long, and the cost is high. Summary of the invention

[0004] The present invention provides a well exploration layered production test system and an implementation method based on wireless control, the purpose of which is to be able to.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A wireless controller comprises a guide seat, the upper end of the guide seat is detachably connected to an adapter, the upper end of the adapter is detachably connected to a tail seat, a positioning groove is respectively arranged on the facing end faces of the guide seat and the tail seat, a protective tube is sleeved on the adapter, a spacing is provided between the protective tube and the adapter, two ends of the adapter are respectively inserted into two positioning grooves, and a permanent magnetic core is arranged between the protective tube and the adapter.

[0007] A mechanical switch valve comprises a female joint, the upper end of the female joint is detachably connected to a transfer seat, the upper end of the transfer seat is detachably connected to the female joint, a third groove is formed between the male joint, the transfer seat and the valve sleeve, a valve sleeve is slidably fitted in the central hole of the male joint and the transfer 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 joint and the male joint both have a reduced diameter section to form a shoulder, the transfer seat is provided with a radial opening communicated with its own interior, the valve sleeve can close the radial opening, and the inner wall of the valve sleeve is fixedly connected to the inner convex portion of the valve sleeve.

[0008] An intelligent switch includes a lower joint, a primary valve body is inserted into the upper part of the lower joint, a primary valve body convex part is fixedly connected to the outer wall of the primary valve body, a valve seat is detachably connected to the upper part of the lower joint, the primary valve body is slidably fitted in the central hole of the valve seat, a first groove is formed between the lower joint and the valve seat, the primary valve body convex part is fitted in the first groove, a liquid hole is arranged on the valve seat, when the primary valve body convex part is located at the top of the first groove, the primary valve body blocks the liquid hole at this time, when the primary valve body moves downward until it is separated from the liquid hole, the liquid hole is opened; a valve seat is arranged on the valve seat Flow channel b, when the convex part of the primary valve body is located at the top of the first groove, the convex part of the primary valve body is located at the bottom of the valve seat flow channel b, 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 to 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 into the two positioning holes ; The upper end of the fixed seat is detachably provided with an 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 a center tube is provided at the upper end of the secondary valve body, and a shoulder is provided at the upper end of the inner wall of the fixed seat The lower end of the inner wall of the upper joint is provided with a shoulder, 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, wherein 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.

[0009] Among them, a fixing seat ring groove is arranged on the inner wall of the fixing seat, and the fixing seat ring groove is connected with the pilot positioning rod installation cavity; the secondary valve body and the center tube are connected at the center positioning hole of the fixing seat, wherein the connecting surface of the center tube and the secondary valve body is provided with a connecting liquid inlet groove, the pilot positioning rod is placed in the fixing seat, and sealing rings are arranged 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.

[0010] The control system can be programmed and can control the delayed triggering of the first pilot valve and the second pilot valve.

[0011] The circumference of the docking liquid inlet slot is 0.3 mm wide and 0.3 mm deep.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] A wireless-controlled stratified production test system for exploration wells comprises an oil pipe, and a threaded plug, a mechanical switch valve, a plurality of intelligent switches, a safety joint and a wellhead device which are sequentially connected from bottom to top through the oil pipe, and a packer connected to the oil pipe is arranged between any two adjacent intelligent switches.

[0016] A method for stratified production test of an exploration well based on wireless control comprises the following steps:

[0017] Step 1: Open the mechanical switch valve in the test production string and lower it into the well;

[0018] 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.

[0019] 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.

[0020] The beneficial effects of the wirelessly controlled well exploration layered production test system and implementation method of the present invention are as follows:

[0021] The production test system uses a wireless controller at the wellhead to control the intelligent switch of each layer. The intelligent switch valve uses the well fluid pressure to realize the switch action and maintain the switch power source for a long time. It is suitable for open hole wells and cased wells. The production test system has simple process, precise production layer and liquid production control, and can realize the sealing test between each production layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a stratified production test system for exploration wells based on wireless control;

[0023] Figure 2 This is a schematic diagram of a wireless controller;

[0024] Figure 3 It is a schematic diagram of a second embodiment of the intelligent switch;

[0025] Figure 4 is a schematic diagram of a second embodiment of a guide seat;

[0026] Figure 5 This is a schematic diagram of an intelligent switch;

[0027] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0028] Figure 7 is a schematic diagram of the central tube;

[0029] Figure 8 for Figure 5 The enlarged view of point B in the middle;

[0030] Fig. 9 This is a schematic diagram of the valve opening of the intelligent switch;

[0031] Fig.10 This is a schematic diagram of the valve closing of the intelligent switch;

[0032] Fig.11 is a schematic diagram of a wireless controller;

[0033] Fig.12 is a schematic diagram of a mechanical switch valve;

[0034] Fig.13 and 14 This is the control principle diagram and strategy diagram of the intelligent switch.

[0035] In the figure: 1. lower joint; 2. primary valve body; 3. valve seat; 3a. liquid hole; 3b. valve seat flow channel; 4. pull ring; 5. secondary valve body; 6. pressure transmission limit tube; 7. body shell; 8. force amplification ring; 9. fixed seat; 9a. fixed seat ring groove; 10. pilot positioning rod; 11. first pilot valve; 12. electric chamber shell; 13. battery pack; 14. center tube; 15. control system; 16. upper joint; 17. second pilot valve; 18. male connector; 19. adapter seat; 20. valve sleeve; 21. female connector; 22. steel ball; 23. guide seat; 23a. sand cleaning groove; 23b. inclined channel; 24. protective tube; 25. magnetic core; 26. adapter; 27. tail seat. DETAILED DESCRIPTION

[0036] The wireless-controlled stratified production test system for exploration wells includes a wellhead device and a wireless controller installed at the wellhead, wherein the wellhead device is used to meet the test sealing of the wellhead pump truck operation and to place the wireless controller and the steel ball 22;

[0037] Among them, reference Figures 1 to 4 The wireless controller comprises: 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 respectively arranged on the end faces facing each other of the guide seat 23 and the tail seat 27, a protective tube 24 is sleeved on the adapter 26, a spacing is provided between the protective tube 24 and the adapter 26, two ends of the adapter 26 are respectively inserted into two positioning grooves, a permanent magnetic core 25 is arranged between the protective tube 24 and the adapter 26, wherein the magnetic core 25 can provide a magnetic signal, the guide seat 23, the protective tube 24 and the tail seat 27 form a wireless controller shell, the whole of the wireless controller shell is a cylindrical structure, the lower end of the wireless controller shell is an arc end, and the upper end edge of the wireless controller shell is a chamfered surface;

[0038] Preferably, the entire structure of the wireless controller is coaxially arranged, the outer surface of the guide seat 23 is provided with a sand cleaning groove 23a, the axis of the guide seat 23 passes through the lower end of the sand cleaning groove 23a, the right part of the guide seat 23, the adapter 26 and the tail seat 27 form a flow channel on the axis, and the guide seat 23 is provided with an inclined channel 23b that is connected to the sand cleaning groove 23a, and the inclined channel 23b is connected to the flow channel. When the wireless controller is placed 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 stuck in the oil pipe, it can be pumped through the wellhead. When the liquid enters the flow channel in the wireless controller and sprays out through the sand cleaning groove 23a and the inclined channel 23b, the sand stuck position can be cleared, ensuring that the wireless controller effectively and quickly passes through the intelligent switch valve and the control signal is effectively sent.

[0039] It also includes an oil pipe and a safety joint fixed on the upper side of the oil pipe. After the testing of all production layers in the whole well is completed, the oil pipe on the upper part of the safety joint can be pulled out, thereby reducing the test production cost of a single well;

[0040] It also includes packers for isolating various production zones;

[0041] Combination Figures 5 to 10, and also includes an intelligent switch, which includes a lower joint 1, a primary valve body 2 is plugged into the upper part of the center hole of the lower joint 1, a primary valve body convex part is fixedly connected to the outer wall of the primary valve body 2, and a valve seat 3 is threadedly connected to the upper part of the lower joint 1 through a threaded pair, and the primary valve body 2 is slidably fitted in the center hole of the valve seat 3, and a first groove is formed between the lower joint 1 and the valve seat 3, and the primary valve body convex part is fitted in the first groove, so that the primary valve body 2 can slide along the axis of the valve seat 3, and a liquid hole 3a is provided on the valve seat 3. When the primary valve body convex part is located at the top of the first groove, the primary valve body 2 blocks the liquid hole 3a at this time, and the liquid hole 3a is closed. When the primary valve body 2 moves downward until it is separated from the liquid hole 3a, the liquid hole 3a is opened; a valve seat flow channel 3b is provided on the valve seat 3 When the primary valve body convex portion is located at the top of the first groove, the primary valve body convex portion 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, the positioning ring groove is located on the upper side of the liquid hole 3a, a pull ring 4 fixed on the valve seat 3 and fixed in the positioning ring groove, the upper end of the pull ring 4 is threadedly connected to the body shell 7 through a thread pair, the upper end of the body shell 7 is threadedly connected to the fixed seat 9 through a thread pair, the upper end of the valve seat 3 is provided with a positioning hole, the lower end of the fixed seat 9 is provided with a positioning hole, a pressure transmission limit tube 6 is provided between the valve seat 3 and the fixed seat 9, and the upper and lower ends of the pressure transmission limit tube 6 are respectively inserted into the two positioning holes; the upper end of the fixed seat 9 is threadedly connected to the electric cavity shell 12 through a thread pair, and the upper end of the electric cavity shell 12 is threadedly connected to the upper joint 1 through a thread pair 6; A secondary valve body 5 is arranged at the upper end of the primary valve body 2, and a secondary valve body convex part is fixedly connected to the outer wall of the secondary valve body 5, and the secondary valve body 5 slides in the center hole of the valve seat 3 and the fixed seat 9, and a second groove is formed between the valve seat 3, the main body shell 7 and the fixed seat 9, and the secondary valve body convex part slides in the second groove, and the force amplifying ring 8 is arranged in the second groove, and the force amplifying ring 8 is located between the secondary valve body convex part and the fixed seat 9, and a center tube 14 is arranged at the upper end of the secondary valve body 5, and a shoulder is arranged at the upper end of the inner wall of the fixed seat 9, and a shoulder is arranged at the lower end of the inner wall of the upper joint 16, and the center tube 14 is stuck in the two shoulders. When the primary valve body 2 moves to the upper maximum stroke position, the primary valve body 2, the secondary valve body 5 and the center tube 14 abut against each other; the lower joint 1, the primary valve body 2. The minimum inner diameters of the secondary valve body 5, the center tube 14 and the upper joint 16 are the same, forming a through diameter; a cavity is formed between the fixed seat 9, the electric cavity housing 12, the center 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 arranged in the cavity; the battery pack 13 provides power for the control system 15, the first pilot valve 11 and the second pilot valve 17, and the control system 15 can be programmed to control the delayed triggering of the first pilot valve 11 and the second pilot valve 17, wherein the control system 15 can detect the magnetic signal in the oil pipe, and analyze and control the first pilot valve 11 and the second pilot valve 17 by identifying the magnetic signal, and a pilot positioning rod 10 is respectively installed at the lower end of the first pilot valve 11 and the second pilot valve 17;

[0042] Among them, a fixed seat ring groove 9a is arranged on the inner wall of the fixed seat 9, and the fixed seat ring groove 9a is connected with the installation cavity of the pilot positioning rod 10; the secondary valve body 5 and the center tube 14 are docked at the center positioning hole of the fixed seat 9, wherein the docking surface of the center tube 14 and the secondary valve body 5 is provided with a docking liquid inlet groove with a circumferential width of 0.3mm and a depth of 0.3mm, and the docking liquid inlet groove has a sand-proof function to prevent sand accumulation in the installation sealing cavity of the pilot positioning rod 10 and the fixed seat 9, thereby improving the reliability of the action of the pilot positioning rod 10.

[0043] Among them, the pilot positioning rod 10 is placed in the fixed seat 9, and sealing rings are provided on the lower and upper sides of the pilot positioning rod 10. The sealing diameter of the lower side of the pilot positioning rod 10 is smaller than the sealing diameter of the upper side. When the well fluid enters the cavity formed by the pilot rod 10 through the fixed seat ring groove 9a, the pressure areas at the lower and upper ends of the pilot positioning rod 10 are different, and the pressure area at the lower end is smaller than the pressure area at the upper end. Under the continuous action of the downhole liquid, the pilot positioning rod 10 continues to maintain the force of moving upward.

[0044] The large diameter tail portions on the upper sides of the two pilot positioning rods 10 are connected to the first pilot valve 11 and the second pilot valve 17 respectively, wherein the first pilot valve 11 and the second pilot valve 17 are electrically controlled actuators of the telescopic cylinder type. In the initial state, the first pilot valve 11 and the second pilot valve 17 are in an extended state, and the push rods of the first pilot valve 11 and the second pilot valve 17 are extended 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 are retracted, the pilot positioning rod 10 moves upward with the corresponding first pilot valve 11 or second pilot valve 17 under the action of continuous well fluid pressure;

[0045] The control system 15 in the intelligent switch can be set to a delayed trigger mode, and at the same time, the delay time can be controlled. When the first pilot valve 11 is retracted, the intelligent switch performs a valve opening action; at the same time, the second pilot valve 17 is delayed and triggered. When the second pilot valve 17 is triggered to retract, the intelligent switch performs a valve closing action;

[0046] Specifically, when the intelligent switch is lowered into the well, the first pilot valve 11 and the second pilot valve 17 are both in an extended state, that is, the intelligent switch is in a closed valve state, and the upper end of the pilot positioning rod 10 connected to the first pilot valve 11 is blocked at the top of the central channel of the pressure transmission limit tube 6; when the wireless controller is dropped into the wellhead casing through the inside of the intelligent switch, the control system 15 performs signal detection, and when the corresponding execution signal is detected, the control system 15 triggers the first pilot valve 11 to execute, and 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 is displaced 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 limit tube 6 and the valve seat flow channel 3b form a complete flow channel, and the well fluid enters the cavity where the pilot positioning rod 10 is located through the fixed seat ring groove 9a, and then pushes the convex part of the first-level valve body to move downward through the complete flow channel, so that the convex part of the first-level valve body drives the first-level valve body 2 to move downward. At this time, the liquid hole 3a blocked by the first-level valve body 2 is opened, and the intelligent switch is in the valve opening state; the first-level valve body 2 is provided with a sealing ring structure on both the upper and lower sides, and when the upper side of the first-level valve body 2 is accompanied by continuous pressure from the well fluid, the first-level valve body 2 maintains a continuous downward force; to prevent the first-level valve body 2 from being scratched when other working tools are lifted and lowered during other operations in the casing, resulting in the erroneous operation of closing the valve.

[0047] 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. The pilot positioning rod 10 restricted by the second pilot valve 17 moves to the upper side of the large diameter after being subjected to the pressure of the well fluid. At this time, the seal at the small diameter of the lower side of the pilot positioning rod 10 fails, and a liquid passage is formed on the lower side. When the well fluid enters the cavity of the pilot positioning rod 10 through the notch 9a of the fixed seat ring, and then enters the cavity formed by the force-enhancing ring 8, the secondary valve body 5, the main body shell 7, and the fixed seat 9 through the lower side of the pilot positioning rod 10, the lower side of the force-enhancing ring 8 is a sealed cavity. When subjected to the downward pressure of the well fluid, the force-enhancing ring 8 leads the secondary valve body 5 to move downward. When the secondary valve body 5 moves downward to block the liquid passage hole 3a of the valve seat 3, the intelligent switch valve is in a closed valve state.

[0048] A first inverted structure 5a is provided on the outer wall of the convex part of the secondary valve body, and a second inverted structure 7a is provided on the inner wall of the main body shell 7. The second inverted structure 7a is located in the second groove. The first inverted structure 5a and the second inverted structure 7a are unidirectional inverted thread locking structures. When the first inverted structure 5a moves downward and approaches the second inverted structure 7a, the first inverted structure 5a can enter the second inverted structure 7a. At this time, if the first inverted structure 5a moves upward, the first inverted structure 5a and the second inverted structure 7a are locked, so that when the secondary valve body 5 performs the valve closing action, the inverted thread can form a self-locking device to ensure the reliability and stability of the intelligent switch valve closing.

[0049] A locking groove mechanical closing device is provided on the central channel of the secondary valve body 5 in the intelligent switch. When the valve cannot be closed due to sand jam, scaling, wax deposition or sealing failure in the well, a bridge plug can be lowered from the wellhead. When the bridge plug passes through the central channel of the secondary valve body 5 of the intelligent switch, the bridge plug expands and locks on the locking groove of the central channel of the secondary valve body 5. With the continuous pressurization of the wellhead, the secondary valve body 5 is driven to move downward, thereby realizing mechanical forced closing of the valve.

[0050] When the wireless controller passes through the central channel inside the intelligent switch, the control system 15 inside the intelligent switch identifies the magnetic signal of the magnetic core 25, and analyzes it through the built-in program to generate an action instruction for the corresponding layer.

[0051] Also includes a mechanical switch valve, combined with Fig.12 The mechanical switch valve includes a female buckle joint 18, the upper end of the female buckle 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 buckle joint 21 through a thread pair, a third groove is formed between the male buckle joint 18, the adapter seat 19 and the valve sleeve 20, a valve sleeve 20 is slidably fitted in the center holes of the male buckle joint 18 and the adapter seat 19, a valve sleeve convex portion is fixedly connected to the outer wall of the valve sleeve 20, and the outer convex portion of the valve sleeve is slidably fitted in the third groove The inner walls of the female joint 18 and the male joint 21 have a reduced diameter section to form a shoulder, thereby limiting the maximum stroke of the valve sleeve 20. The adapter seat 19 is provided with a radial opening that is connected to its own interior. The valve sleeve 20 can close the radial opening to close the valve. When the valve sleeve 20 moves downward, the radial opening opens to open the valve. The inner wall of the valve sleeve 20 is fixedly connected with an inner convex portion of the valve sleeve, and the top of the inner convex portion of the valve sleeve is used to block the steel ball 22, wherein the steel ball 22 is dropped from the wellhead oil pipe.

[0052] The above-mentioned test production method of the exploration well layered test production system based on wireless control is used as an example to illustrate the embodiment of the four-layer test production. Fig.11 and Fig.13 , including the following steps:

[0053] Step 1: Before construction, set the switch program, set the layer position, detection signal number, delay time and other program parameters according to the well conditions, and then lower the pipe string, connect the plug, mechanical switch valve, several intelligent switches, safety joints and wellhead devices from bottom to top through the trial production tubing, and set a packer between any two adjacent intelligent switches; open the mechanical switch valve in the trial production pipe string, and close the valve of each layer of intelligent switch and lower it into the well;

[0054] Step 2: Pump the steel ball 22 into the wellhead oil pipe, and the steel ball 22 pushes the valve sleeve 20 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 each production layer.

[0055] Step 3: When a wireless controller is placed in the wellhead oil pipe, the intelligent switch of each production layer detects the switch magnetic signal once. When the fourth layer at the bottom detects a magnetic signal once, the intelligent switch of the fourth layer performs the valve opening action, and the intelligent switches of the other three layers do not perform the action. At this time, the fourth layer is tested for production.

[0056] Step 4. When the trial production of layer 4 is completed, a wireless controller is deployed at the wellhead again. The intelligent switch of each production layer detects the switch magnetic signal twice. At this time, the intelligent switch of layer 4 is in the closed state, the delayed valve opening action of layer 3 is performed, and the other two layers have no action. At this time, the entire string is in the closed state of each layer, and the wellhead pump truck can be pressurized to realize the airtight sealing of each layer's packer and the intelligent switch valve.

[0057] Step 5: After the sealing test is completed, the valve opening action is performed on layer 3 to conduct trial production on layer 3.

[0058] Step 6. After the trial production of layer 3 is completed, a wireless controller is placed at the wellhead again. The intelligent switch of each production layer detects the switch magnetic signal three times. At this time, layer 3 closes the valve, layer 2 still delays the valve opening, and other layers are in a closed state. At the same time, the packers of each layer and the intelligent switch can be closed to test the airtightness.

[0059] Step 7: After the seal verification is completed, the valve of layer 2 is opened and trial production of layer 2 is carried out.

[0060] Step 8. After the trial production of layer 2 is completed, a wireless controller is placed at the wellhead again. The intelligent switch of each production layer detects the switch magnetic signal 4 times. At this time, layer 2 closes the valve, layer 1 still delays the valve opening, and other layers are in a closed state. At the same time, the packers of each layer and the intelligent switch can be closed to test the airtightness.

[0061] Step nine, open the valve at layer one and conduct trial production at layer one.

Claims

1. A wireless controller, characterized in that: The invention comprises a guide seat (23), the upper end of the guide seat (23) is detachably connected to a transfer member (26), the upper end of the transfer member (26) is detachably connected to a tail seat (27), a positioning groove is respectively arranged on the end faces facing each other of the guide seat (23) and the tail seat (27), a protective tube (24) is sleeved on the transfer member (26), a spacing is provided between the protective tube (24) and the transfer member (26), two ends of the transfer member (26) are respectively inserted into the two positioning grooves, and a permanent magnetic core (25) is arranged between the protective tube (24) and the transfer member (26).

2. A mechanical switch valve, characterized in that: The invention comprises a female snap joint (18), the upper end of the female snap joint (18) is detachably connected to an adapter seat (19), the upper end of the adapter seat (19) is detachably connected to a female snap joint (21), a third groove is formed between the male snap joint (18), the adapter seat (19) and the valve sleeve (20), a valve sleeve (20) is slidably fitted in the central hole of the male snap joint (18) and the adapter seat (19), a valve sleeve convex portion is fixedly connected to the outer wall of the valve sleeve (20), the outer convex portion of the valve sleeve is slidably fitted in the third groove, the inner walls of the female snap joint (18) and the male snap joint (21) are both provided with a reduced diameter section to form a shoulder, the adapter seat (19) is provided with a radial opening which is in communication with the interior of the adapter seat, the valve sleeve (20) is capable of closing the radial opening, and the inner wall of the valve sleeve (20) is fixedly connected to the inner convex portion of the valve sleeve.

3. An intelligent switch, characterized in that: The valve seat (3) comprises a lower joint (1), wherein a primary valve body (2) is inserted into the upper part of the lower joint (1), a primary valve body convex part is fixedly connected to the outer wall of the primary valve body (2), and a valve seat (3) is detachably connected to the upper part of the lower joint (1). The primary valve body (2) is slidably fitted in the central hole of the valve seat (3), and a first groove is formed between the lower joint (1) and the valve seat (3). The primary valve body convex part is fitted in the first groove. A liquid hole (3a) is provided on the valve seat (3). When the primary valve body convex part is located at the top of the first groove, the primary valve body (2) blocks the liquid hole (3a). When the primary valve body (2) moves downward until it is separated from the liquid hole (3a), the liquid hole (3a) is opened. A valve seat flow channel (3) b is provided on the valve seat (3). When the primary valve body convex part is located at the top of the first groove, the primary valve body (2) blocks the liquid hole (3a). When the primary valve body (2) moves downward until it is separated from the liquid hole (3a), the liquid hole (3a) is opened. When the body convex portion is located at the top of the first groove, the primary valve body convex portion is located at the bottom of the valve seat flow channel (3) b, a positioning ring groove is provided on the outer wall of the valve seat (3), the positioning ring groove is located on the upper side of the liquid hole (3a), a pull ring (4) fixed on the valve seat (3) and fixed in the positioning ring groove, the upper end of the pull ring (4) is detachably connected to the body shell (7), the upper end of the body shell (7) is detachably provided with a fixed seat (9), the upper end of the valve seat (3) is provided with a positioning hole, the lower end of the fixed seat (9) is provided with a positioning hole, a pressure transmission limit tube (6) is provided between the valve seat (3) and the fixed seat (9), the upper and lower ends of the pressure transmission limit tube (6) are respectively inserted into the two positioning holes; the upper end of the fixed seat (9) is detachably provided with an electric cavity shell (12), The upper end of the electric chamber housing (12) is detachably connected to an upper joint (16); a secondary valve body (5) is arranged at the upper end of the primary valve body (2); a secondary valve body protrusion is fixedly connected to the outer wall of the secondary valve body (5); the secondary valve body (5) is slidably fitted in the center holes of the valve seat (3) and the fixed seat (9); a second groove is formed between the valve seat (3), the main housing (7) and the fixed seat (9); the secondary valve body protrusion is slidably fitted in the second groove; a force amplifying ring (8) is arranged in the second groove; the force amplifying ring (8) is located between the secondary valve body protrusion and the fixed seat (9); a center tube (14) is arranged at the upper end of the secondary valve body (5); a shoulder is arranged at the upper end of the inner wall of the fixed seat (9); a shoulder is arranged at the lower end of the inner wall of the upper joint (16); and the center tube (14) is stuck in the two shoulders, and when the primary valve body (2) moves to the upper maximum stroke position, the primary valve body (2), the secondary valve body (5) and the center tube (14) abut against each other; a cavity is formed between the fixed seat (9), the electric cavity housing (12), the center 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 arranged in the cavity; the battery pack (13) provides electrical energy to the control system (15), the first pilot valve (11) and the second pilot valve (17), wherein the control system (15) is capable of detecting magnetic signals, and a pilot positioning rod (10) is respectively installed at the lower end of the first pilot valve (11) and the second pilot valve (17); The inner wall of the fixed seat (9) is provided with a fixed seat ring notch, which is connected to the installation cavity of the pilot positioning rod (10); the secondary valve body (5) and the central tube (14) are connected at the central positioning hole of the fixed seat (9), wherein the connecting surface of the central tube (14) and the secondary valve body (5) is provided with a connecting liquid inlet notch, the pilot positioning rod (10) is placed in the fixed seat (9), and sealing rings are provided on the lower and upper sides of the pilot positioning rod (10), and the sealing diameter of the lower side of the pilot positioning rod (10) is smaller than the sealing diameter of the upper side.

4. The intelligent switch according to claim 3 is characterized in that: The control system (15) can be programmed and can control the delayed triggering of the first pilot valve (11) and the second pilot valve (17).

5. The intelligent switch according to claim 3 is characterized in that: The circumference of the docking liquid inlet slot is 0.3 mm wide and 0.3 mm deep.

6. The intelligent switch according to claim 3, characterized in that: The first pilot valve (11) and the second pilot valve (17) are electrically controlled actuators. In an initial state, the first pilot valve (11) and the second pilot valve (17) are in an extended state. The push rods of the first pilot valve (11) and the second pilot valve (17) are extended 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) are retracted, the pilot positioning rod (10) moves upward with the corresponding first pilot valve (11) or second pilot valve (17) under the action of continuous well fluid pressure.

7. The intelligent switch according to claim 3, characterized in that: A first inverted structure (5a) is arranged on the outer wall of the convex part of the secondary valve body, and a second inverted structure (7a) is arranged on the inner wall of the main body shell (7). The second inverted structure (7a) is located in the second groove. The first inverted structure (5a) and the second inverted structure (7a) are one-way inverted thread locking structures. When the first inverted structure (5a) moves downward and approaches the second inverted structure (7a), the first inverted structure (5a) can enter the second inverted structure (7a). At this time, if the first inverted structure (5a) moves upward, the first inverted structure (5a) and the second inverted structure (7a) are locked.

8. The intelligent switch according to claim 3, characterized in that: A locking groove mechanical closing device is provided on the central passage of the secondary valve body (5). When the valve cannot be closed due to sand jam, 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 secondary valve body (5) of the intelligent switch, the bridge plug expands and locks on the locking groove of the central passage of the secondary valve body (5). With the continuous pressurization of the wellhead, the secondary valve body (5) is driven to move downward, thereby realizing mechanical forced closing of the valve.

9. A wireless controlled exploration well layered production test system, characterized in that: It includes an oil pipe, and a plug, a mechanical switch valve, a plurality of intelligent switches, a safety joint and a wellhead device which are sequentially connected from bottom to top through the oil pipe, and a packer connected to the oil pipe is arranged between any two adjacent intelligent switches.

10. A method for stratified production test of exploration wells based on wireless control, characterized in that: The following steps are involved: 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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