Cable-free intelligent packer and using method

Abstract

The invention relates to the technical field of single-pipe layered oil production, in particular to a cable-free intelligent packer and a using method. Comprising an underground oil supply mechanism, an upper connecting pipe, an out-of-pipe flowmeter, a middle central pipe, a pressure boosting and releasing mechanism, a connector and a hydraulic setting mechanism which are connected in sequence. The pressurization and pressure relief mechanism mainly comprises a middle sealing head, a circuit framework, a PLC circuit, an underground pressure receiver, an underground large-capacity battery, a middle sealing sleeve, a flow meter outside a pipe, a pressurization motor, a plunger pump, a pressure relief motor, a rotating assembly, a pressure relief plunger, a pressurization sealing sleeve, a middle pressure transmission connector, a setting pipeline, a pressure relief pipeline, a three-way connector and a setting connector. A setting channel is formed; the technology of cableless control, mechanical and electrical integration, hydraulic transmission and the like is integrated, a high-thrust packer controlled by an underground cableless motor is formed, and the intelligent level of the layered packer is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of single-tube layered oil production, and particularly relates to a cableless intelligent packer and a usage method thereof. Background Art

[0002] Shengli Oilfield has entered the high water cut development stage, and the demand for fine layering is more urgent, which puts forward higher requirements for the working performance of the layered packer. It is required that the packer not only realizes reliable sealing after setting, but also ensures smooth well flushing after unsealing. At present, the layered packers mainly include tubing pressure injection packers and mechanically set packers, and there is relatively little research on intelligent layered packers. Patent Application No. 201510604036.5, "Wireless Communication Type Layered Water Injection Injector and Cableless Water Injection Allocation System for Water Injection Wells", only discloses a wireless communication type layered water injection injector, which solves the problems that the traditional water distributor needs to use power supply and steel armored cable to connect with the ground, and the steel armored cable cannot meet the requirements of layered water injection. The pressure sensor unit collects pressure signals and sends the pressure signals to the ground controller; the ground controller lowers the test short circuit to the injector at the underground target layer through the cable, but the ordinary layered packer is still used in its water injection allocation system; Patent Application No. 201811048861.1, "Five-parameter Intelligent Seal Inspection Instrument for Water Injection Wells with Separate Injection", discloses a five-parameter intelligent seal inspection instrument inserted into the tubing, which realizes the direct-reading electric seal inspection of downhole packers in layered water injection wells and simultaneously measures five production parameters of the water distributor in the water injection well with separate injection, improving the test efficiency and test reliability of the water injection well with separate injection. It belongs to a seal inspection tool for testing and needs to be lowered by cable fishing during use, which is relatively difficult to implement for the packer used in well completion; Patent Application No. 202122648254.2, "An Electrically Set Packer and Its Separate Production String", the set packer includes an electric drive mechanism, a lead screw transmission mechanism and a hydraulic boosting mechanism connected in sequence; the electric drive mechanism includes a cable connector, a motor casing, a motor, an oil seal rubber cylinder, a rubber cylinder sheath, a sealing sleeve and a torque sleeve; the motor casing is arranged outside the motor, the upper end of the motor is connected with the cable connector, and the lower end of the motor is connected with the torque sleeve; the oil seal rubber cylinder is arranged outside the motor casing, the rubber cylinder sheath is arranged outside the oil seal rubber cylinder, and the sealing sleeve is arranged between the lower part of the motor and the motor casing. The electric set packer of the present invention can quickly realize setting, is convenient to operate and has a stable setting; the separate production string adopts the electric set packer and an intelligent switch, which is convenient to control and can realize the real-time optimized production of oil wells at any layer. This packer has gradually approached the intelligent packer, but it still needs to lower a cable for control during use, and the electric setting force is small, which is difficult to meet the long-term layering requirements. Therefore, it is necessary to develop a cableless large-thrust intelligent packer to realize the functions of reliable downhole setting, rapid unsealing and re-setting after self-seal inspection.

[0003] Application No. 201510604036.5, "Wireless Communication Type Stratified Water Injector for Injection Wells and Cableless Water Injection Allocation System for Injection Wells" discloses a wireless communication type stratified water injector for injection wells and a cableless water injection allocation system for injection wells, which relates to the technical field of water injection allocation in oilfield injection wells. It solves the problems that the traditional water distributor needs to use power supply and armored cables to connect with the ground, and the armored cables cannot meet the requirements of stratified water injection. The pressure sensor unit collects pressure signals and sends the pressure signals to the ground controller; the ground controller lowers the test short circuit to the water injector at the underground target layer through a cable. At the same time, it issues corresponding instructions to change the flow rate in the water injector, and sends a power supply instruction to the power supply unit through the test short circuit and the wireless communication module. At this time, the power supply unit works, and the drive unit drives the flow rate adjustment unit and the flow rate monitoring unit to work, adjusting the amount of the substance to be water injected. In the cableless water injection allocation system for injection wells, there is no need to use armored cables to connect with the ground. The water injectors are connected through packers and are located in each underground layer. It is also applicable to stratified water injection in other occasions.

[0004] Application No. 201811048861.1, "Five-parameter Intelligent Seal Verification Instrument for Injection Wells with Separate Water Injection" discloses a five-parameter intelligent seal verification instrument for injection wells with separate water injection. The positioning mechanism is connected to the positioning mechanism opening and closing drive device above through an inner connecting rod sleeve on one hand, and is connected to the sealing mechanism above through a coupling sleeve on the other hand. The sealing mechanism is connected to the unseating drive device of the sealing mechanism above through a long sheath. The positioning mechanism opening and closing drive device is electrically connected to the lower integrated test device, and both are arranged in the middle sheath. The middle sheath is installed in the long sheath. The unseating drive device of the sealing mechanism is electrically connected to the upper integrated test device, and both are arranged in the upper protective cylinder. A temperature sensor, a flow sensor, a magnetic positioning joint, and an upper pressure sensor are also arranged in the upper protective cylinder. A lower pressure sensor is arranged inside the upper end of the inner connecting rod sleeve. The present invention realizes direct-reading electric seal verification of downhole packers in stratified injection wells, and simultaneously measures five production parameters of the water distributor in injection wells with separate water injection, improving the test efficiency and test reliability of injection wells with separate water injection.

[0005] Application No. 202122648254.2, "An Electric Setting Packer and Its Separate Production String" relates to the separate production tubing string for oil development, and specifically relates to an electric setting packer and its separate production string. The setting packer includes an electric drive mechanism, a lead screw drive mechanism, and a hydraulic boosting mechanism connected in sequence; the electric drive mechanism includes a cable connector, a motor casing, a motor, an oil seal rubber cylinder, a rubber cylinder sheath, a sealing sleeve, and a torque sleeve; a motor casing is arranged outside the motor, the upper end of the motor is connected to the cable connector, and the lower end of the motor is connected to the torque sleeve; an oil seal rubber cylinder is arranged outside the motor casing, a rubber cylinder sheath is arranged outside the oil seal rubber cylinder, and a sealing sleeve is arranged between the lower part of the motor and the motor casing. The electric setting packer of the present invention can quickly achieve setting, is convenient to operate, and has a stable setting; the separate production string uses the electric setting packer and an intelligent switch, is convenient to control, and can realize real-time optimized production of any layer of oil well. Summary of the Invention

[0006] The purpose of the present invention is to provide a cableless intelligent packer and its usage method for the deficiencies in the prior art.

[0007] The present invention adopts technologies such as cableless control, mechatronics, and hydraulic transmission. Through remote control, it realizes large-thrust hydraulic setting downhole to ensure the downhole sealing effect. When it is necessary to release the seal, through remote control, it realizes the rapid release of hydraulic oil downhole to quickly release the packer. It has a built-in flow measurement function and can dynamically compensate pressure according to the measured flow to ensure the long-term sealing effect of the packer.

[0008] Its technical solution is as follows: A cableless intelligent packer includes a downhole oil supply mechanism, an upper connecting pipe, an external pipe flowmeter, an intermediate central pipe, a pressure boosting and relieving mechanism, a connecting head, and a hydraulic setting mechanism connected in sequence. The pressure boosting and relieving mechanism mainly includes an intermediate sealing head, a circuit framework, a PLC circuit, a downhole pressure receiver, a downhole large-capacity battery, an intermediate sealing sleeve, an external pipe flowmeter, a pressure boosting motor, a plunger pump, a pressure relieving motor, a rotating assembly, a pressure relieving plunger, a pressure boosting sealing sleeve, a middle pressure transmission joint, a setting pipeline, a pressure relieving pipeline, a three-way joint, a setting joint, and a setting channel.

[0009] Further, the circuit framework is fixed outside the upper central pipe, the PLC circuit board and the downhole pressure receiver are both placed in the circuit framework, and the downhole large-capacity battery is fixed outside the upper central pipe; the pressure boosting motor and the plunger pump are combined into a pressure boosting unit; the pressure relieving motor, the rotating assembly, and the pressure relieving plunger are combined into a pressure relieving unit.

[0010] Further, the pressure relief plunger is placed inside the booster seal sleeve. The inside of the middle pressure transmission joint is threadedly connected to the outside of the middle center pipe, and the outside of the middle pressure transmission joint is threadedly connected to the middle seal sleeve. The setting pipe is connected to the output end of the plunger pump, and the pressure relief pipe is connected to the output end of the pressure relief unit. The three-way joint can connect the setting pipe and the pressure relief pipe at the same time. The setting pipe is connected to the setting joint. The upper part of the joint is threadedly connected to the inside of the middle pressure transmission joint, and the lower part of the joint is threadedly connected to the inside of the lower pressure transmission joint.

[0011] Further, the hydraulic setting mechanism includes a lower pressure transmission joint, a lower center pipe, an adjusting ring, a setting rubber cylinder, a spacer ring, a support sleeve, a setting piston, a lower joint, a starting shear pin, and a short section.

[0012] Further, a setting channel is arranged inside the lower pressure transmission joint. The upper end of the lower center pipe is threadedly connected to the inside of the lower pressure transmission joint. The support sleeve is threadedly connected to the lower pressure transmission joint. The adjusting ring is threadedly connected to the lower pressure transmission joint. The setting rubber cylinder, the adjusting ring, and the setting rubber cylinder are sequentially placed at the outer end of the support sleeve. The setting piston is placed outside the lower center pipe and is fixed to the lower joint by a starting shear pin. The short section is threadedly connected to the lower joint.

[0013] Further, the booster and pressure relief mechanism further includes a hydraulic oil input end, a hydraulic oil high-pressure output end, an injection channel, a pressure relief input end, a pressure relief output end, and a pressure relief channel.

[0014] Further, the hydraulic oil high-pressure output end is connected to the setting joint through a hydraulic control pipeline, the pressure relief pipeline is connected to the pressure relief input end, and the pressure relief output end is connected to the oil return joint through a pipeline.

[0015] Further, between the upper center pipe and the upper sealing head, between the upper sealing head and the upper seal sleeve, between the floating piston and the upper seal sleeve and the upper center pipe, between the upper pressure transmission joint and the upper seal sleeve and the upper connecting pipe, between the middle sealing head and the middle center pipe and the middle seal sleeve, between the middle pressure transmission joint and the middle seal sleeve and the booster seal sleeve, between the lower pressure transmission joint and the support sleeve, between the support sleeve and the setting piston, and between the setting piston and the lower joint are all sealed by rubber rings.

[0016] Further, the downhole large-capacity battery is in a parallel mode of several blocks, and is used to supply power to the flowmeter outside the pipe, the booster motor, the pressure relief motor, and the downhole pressure receiver; the PLC circuit board is used to receive the signals of the flowmeter outside the pipe, the booster motor, the pressure relief motor, and the downhole pressure receiver, and according to the signals fed back from the ground and the flow signals measured downhole, it controls the operation of the booster motor and the pressure relief motor in real time; the downhole pressure receiver is used to receive the change of the wellbore pressure and feedback the pressure change to the PLC circuit in real time to control the booster motor and the pressure relief motor.

[0017] Further, it includes: successively lowering a plug, a water distributor, a cableless intelligent packer, a tubing, a wellhead, and a pressure pulse generator. The ground pressure pulse generator is set by the management personnel to automatically generate pulse signals. When stratified water injection is required, the setting mode is started, and a setting command is sent to each downhole packer through wireless pulses. The downhole cableless intelligent packer executes the setting procedure according to the preset program. When backwashing the well is required, the releasing mode is started, and a releasing command is sent to each downhole packer through wireless pulses. The downhole cableless intelligent packer executes the releasing procedure according to the preset program.

[0018] The beneficial effects of the present invention are as follows: 1. Integrating technologies such as cableless control, mechatronics, and hydraulic drive to form a large-thrust packer with downhole cableless motor control, which improves the intelligent level of the stratified packer.

[0019] 2. Using a cableless control method to avoid the problem of seal failure of the electric control packer joint, and at the same time, the construction is simpler.

[0020] 3. Adopting a hydraulic control setting method, the setting force is greater, and it rebounds quickly after pressure relief, enabling large-displacement backwashing of the well. 4. Using a dual-motor control method, one motor controls the pressure application for setting, and the other motor is responsible for pressure release to complete the release of the packer.

[0021] 5. Adopting a downhole oil cavity and downhole motor pressure application method, abandoning the long-distance downhole hydraulic oil transmission method, and shortening the setting and releasing time of the packer.

[0022] 6. It has a built-in flow test function, can dynamically supplement pressure according to the measured flow rate, and ensure the sealing effect of the packer. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the cableless intelligent packer of the present invention.

[0024] Figure 2 It is a bottom view of the middle pressure transmission joint of the cableless intelligent packer.

[0025] Figure 3 It is a PLC control logic diagram of the cableless intelligent packer.

[0026] Figure 4 It is a sectional view of the stratified water injection pipe string of the cableless intelligent packer.

[0027] In the figure: 1. Plug, 2. Water distributor, 3. Cableless intelligent packer, 4. Oil pipe, 5. Wellhead, 6. Pressure pulse generator, 301. Coupling, 302. Upper central pipe, 303. Rubber ring, 304. Upper seal head, 305. Floating piston, 306. Upper seal sleeve, 307. Upper pressure transmission joint, 308. Oil outlet joint, 309. Balance hole, 310. Oil return joint, 311. Intermediate central pipe, 312. Intermediate seal head, 313. Circuit framework, 314. PLC circuit, 315. Intermediate seal sleeve, 316. Flowmeter outside the pipe, 317. Boosting motor, 318. Plunger pump, 319. Pressure relief motor, 320. Rotating assembly, 321. Pressure relief plunger, 322. Boosting seal sleeve, 323. Intermediate pressure transmission joint, 324. Setting line, 325. Pressure relief line, 326. Three-way joint, 327. Setting joint, 328. Setting channel, 329. Connector, 330. Lower pressure transmission joint, 331. Lower central pipe, 332. Adjusting ring, 333. Setting rubber cylinder, 334. Spacer ring, 335. Support sleeve, 336. Setting piston, 337. Starting shear pin, 338. Lower joint, 339. Nipple, 340. Hydraulic oil input end, 341. High-pressure output end of hydraulic oil, 342. Injection channel, 343. Pressure relief input end, 344. Pressure relief output end, 345. Pressure relief channel, 346. Upper connecting pipe, 347. Downhole pressure receiver, 348. Downhole large-capacity battery. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the specific implementation manners 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 descriptions, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0029] Embodiment 1:

[0030] A cableless intelligent packer 3 mainly consists of a downhole oil supply mechanism, an upper connecting pipe 346, a flowmeter outside the pipe 316, an intermediate central pipe 311, a boosting and pressure relief mechanism, a connector 329, and a hydraulic setting mechanism.

[0031] The downhole oil supply mechanism includes a coupling 301, an upper central pipe 302, a rubber ring 303, an upper seal head 304, a floating piston 305, an upper seal sleeve 306, an upper pressure transmission joint 307, an oil outlet joint 308, a balance hole 309, and an oil return joint 310.

[0032] The collar 301 is threadedly connected to the upper central tube 302. The upper sealing head 304 is placed at the upper end of the upper central tube 302. The upper sealing sleeve 306 is threadedly connected to the upper sealing head 304. The upper pressure transmission joint 307 is threadedly connected to the upper central tube 302 internally and connected to the upper sealing sleeve 306 externally. The floating piston 305 is placed between the upper central tube 302 and the upper sealing sleeve 306. A balance hole 309 is provided on the upper central tube 302. An oil outlet joint 308 and an oil return joint 310 are provided on the upper pressure transmission joint 307. The upper end of the upper connecting pipe 346 is threadedly connected to the upper pressure transmission joint 307, and the lower end is threadedly connected to the external flowmeter 316. The middle central tube 311 is threadedly connected to the external flowmeter 316. The middle sealing head 312 is placed outside the middle central tube 311 and fixed by the step of the upper central tube 302.

[0033] The pressure boosting and pressure relieving mechanism includes the middle sealing head 312, the circuit framework 313, the PLC circuit, the downhole pressure receiver 347, the downhole large-capacity battery 348, the middle sealing sleeve 315, the external flowmeter 316, the pressure boosting motor 317, the plunger pump 318, the pressure relieving motor 319, the rotating assembly 320, the pressure relieving plunger 321, the pressure boosting sealing sleeve 322, the middle pressure transmission joint 323, the setting pipeline 324, the pressure relieving pipeline 325, the three-way joint 326, the setting joint 327, and the setting channel 328.

[0034] The circuit framework 313 is fixed outside the upper central tube 302. The PLC circuit board and the downhole pressure receiver 347 are both placed in the circuit framework 313. The downhole large-capacity battery 348 is fixed outside the upper central tube 302. The pressure boosting motor 317 and the plunger pump 318 are combined into a pressure boosting unit. The pressure relieving motor 319, the rotating assembly 320, and the pressure relieving plunger 321 are combined into a pressure relieving unit.

[0035] The pressure relieving plunger 321 is placed inside the pressure boosting sealing sleeve 322. The middle pressure transmission joint 323 is threadedly connected to the outside of the middle central tube 311 internally and threadedly connected to the middle sealing sleeve 315 externally. The setting pipeline 324 is connected to the output end of the plunger pump 318. The pressure relieving pipeline 325 is connected to the output end of the pressure relieving unit. The three-way joint 326 can connect the setting pipeline 324 and the pressure relieving pipeline 325 simultaneously. The setting pipeline 324 is connected to the setting joint 327. The upper part of the connecting head 329 is threadedly connected to the inside of the middle pressure transmission joint 323, and the lower part of the connecting head 329 is threadedly connected to the inside of the lower pressure transmission joint 330.

[0036] The hydraulic setting mechanism includes the lower pressure transmission joint 330, the lower central tube 331, the adjusting ring 332, the setting rubber cylinder 333, the spacer ring 334, the support sleeve 335, the setting piston 336, the starting shear pin 337, the lower joint 338, and the short joint 339.

[0037] The internal of the downward transfer pressure connector 330 is provided with a setting channel 328. The upper end of the lower central tube 331 is threadedly connected to the inside of the downward transfer pressure connector 330. The support sleeve 335 is threadedly connected to the downward transfer pressure connector 330. The adjusting ring 332 is threadedly connected to the downward transfer pressure connector 330. The setting rubber cylinder 333, the adjusting ring 332, and the setting rubber cylinder 333 are sequentially placed at the outer end of the support sleeve 335. The setting piston 336 is placed outside the lower central tube 331 and fixed to the lower connector 338 by a starting shear pin 337. The short section 339 is threadedly connected to the lower connector 338.

[0038] Among them, the pressure boosting and pressure relief mechanism also includes a hydraulic oil input end 340, a hydraulic oil high-pressure output end 341, an injection channel 342, a pressure relief input end 343, a pressure relief output end 344, a pressure relief channel 345, etc.; the hydraulic oil high-pressure output end 341 is connected to the setting joint 327 through a hydraulic control pipeline. The pressure relief pipeline 325 is connected to the pressure relief input end 343, and the pressure relief output end 344 is connected to the oil return joint 310 through a pipeline.

[0039] Between the upper central tube 302 and the upper sealing head 304, between the upper sealing head 304 and the upper sealing sleeve 306, between the floating piston 305 and the upper sealing sleeve 306 and the upper central tube 302, between the upward transfer pressure connector 307 and the upper sealing sleeve 306 and the upper connecting pipe 346, between the intermediate sealing head 312 and the intermediate central tube 311 and the intermediate sealing sleeve 315, between the middle transfer pressure connector 323 and the intermediate sealing sleeve 315 and the pressure boosting sealing sleeve 322, between the downward transfer pressure connector 330 and the support sleeve 335, between the support sleeve 335 and the setting piston 336, and between the setting piston 336 and the lower connector 338 are all sealed by rubber rings 303.

[0040] The downhole large-capacity battery 348 adopts a parallel mode of several pieces. If one piece fails, other battery packs will be immediately activated; this battery can supply power to the external pipe flowmeter 316, the pressure boosting motor 317, the pressure relief motor 319, and the downhole pressure receiver 347.

[0041] The PLC circuit board can receive the signals of the external pipe flowmeter 316, the pressure boosting motor 317, the pressure relief motor 319, and the downhole pressure receiver 347, and has a certain algorithm. It can control the operation of the pressure boosting motor 317 and the pressure relief motor 319 in real time according to the signals fed back from the ground and the flow signals measured downhole.

[0042] The downhole pressure receiver 347 can receive the change of the wellbore pressure and immediately feedback the pressure change to the PLC circuit. After analysis, it makes a decision to control the pressure boosting motor 317 and the pressure relief motor 319.

[0043] Embodiment 2:

[0044] A cable-free intelligent packer 3 includes a downhole oil supply mechanism, an upper connecting pipe 346, an external pipe flowmeter 316, an intermediate central pipe 311, a pressure boosting and relieving mechanism, a connector 329, a hydraulic setting mechanism, etc. The downhole oil supply mechanism includes a coupling 301, an upper central pipe 302, a rubber ring 303, an upper sealing head 304, a floating piston 305, an upper sealing sleeve 306, an upper pressure transmission joint 307, an oil outlet joint 308, a balance hole 309, and an oil return joint 310. The coupling 301 is threadedly connected to the upper central pipe 302. The upper sealing head 304 is placed at the upper end of the upper central pipe 302. The upper sealing sleeve 306 is threadedly connected to the upper sealing head 304. The inside of the upper pressure transmission joint 307 is threadedly connected to the upper central pipe 302, and the outside is connected to the upper sealing sleeve 306. The floating piston 305 is placed between the upper central pipe 302 and the upper sealing sleeve 306. The balance hole 309 is provided on the upper central pipe 302. The oil outlet joint 308 and the oil return joint 310 are provided on the upper pressure transmission joint 307. The upper end of the upper connecting pipe 346 is threadedly connected to the upper pressure transmission joint 307, and the lower end is threadedly connected to the external pipe flowmeter 316. The intermediate central pipe 311 is threadedly connected to the external pipe flowmeter 316. The intermediate sealing head 312 is placed outside the intermediate central pipe 311 and fixed by the step of the upper central pipe 302. The pressure boosting and relieving mechanism includes an intermediate sealing head 312, a circuit skeleton 313, a PLC circuit, a downhole pressure receiver 347, a downhole large-capacity battery 348, an intermediate sealing sleeve 315, an external pipe flowmeter 316, a pressure boosting motor 317, a plunger pump 318, a pressure relieving motor 319, a rotating assembly 320, a pressure relieving plunger 321, a pressure boosting sealing sleeve 322, a middle pressure transmission joint 323, a setting pipeline 324, a pressure relieving pipeline 325, a tee joint 326, a setting joint 327, and a setting channel 328. The circuit skeleton 313 is fixed outside the upper central pipe 302. The PLC circuit board and the downhole pressure receiver 347 are both placed in the circuit skeleton 313. The downhole large-capacity is fixed outside the upper central pipe 302. The pressure boosting motor 317 and the plunger pump 318 are combined into a pressure boosting unit. The pressure relieving motor 319, the rotating assembly 320, and the plunger are combined into a pressure relieving unit. The plunger is placed inside the pressure boosting sealing sleeve 322. The inside of the middle pressure transmission joint 323 is threadedly connected to the outside of the intermediate central pipe 311, and the outside of the middle pressure transmission joint 323 is threadedly connected to the intermediate sealing sleeve 315. The setting pipeline 324 is connected to the output end of the plunger pump 318. The pressure relieving pipeline 325 is connected to the output end of the pressure relieving unit. The tee joint 326 can connect the setting pipeline 324 and the pressure relieving pipeline 325 at the same time. The setting pipeline 324 is connected to the setting joint 327. The upper part of the connector 329 is threadedly connected to the inside of the middle pressure transmission joint 323, and the lower part of the connector 329 is threadedly connected to the inside of the lower pressure transmission joint 330. The hydraulic setting mechanism includes a lower pressure transmission joint 330, a lower central pipe 331, an adjusting ring 332, a setting rubber cylinder 333, a spacer ring 334, a support sleeve 335, a setting piston 336, a starting shear pin 337, a lower joint 338, and a short section 339.The lower transfer pressure joint 330 is internally provided with a setting channel 328. The upper end of the lower central pipe 331 is threadedly connected to the inside of the lower transfer pressure joint 330. The support sleeve 335 is threadedly connected to the lower transfer pressure joint 330. The adjusting ring 332 is threadedly connected to the lower transfer pressure joint 330. The setting rubber cylinder 333, the adjusting ring 332, and the setting rubber cylinder 333 are sequentially placed at the outer end of the support sleeve 335. The setting piston 336 is placed outside the lower central pipe 331 and is fixed to the lower joint 338 by a starting shear pin 337. The short section 339 is threadedly connected to the lower joint 338.,

[0045] The pressure boosting and pressure relieving mechanism also includes a hydraulic oil input end 340, a hydraulic oil high-pressure output end 341, an injection channel 342, a pressure relief input end 343, a pressure relief output end 344, a pressure relief channel 345, etc. The hydraulic oil high-pressure output end 341 is connected to the setting joint 327 through a hydraulic control pipeline. The pressure relief pipeline 325 is connected to the pressure relief input end 343. The pressure relief output end 344 is connected to the oil return joint 310 through a pipeline.

[0046] Between the upper central pipe 302 and the upper sealing head 304, between the upper sealing head 304 and the upper sealing sleeve 306, between the floating piston 305 and the upper sealing sleeve 306 and the upper central pipe 302, between the upper transfer pressure joint 307 and the upper sealing sleeve 306 and the upper connecting pipe 346, between the intermediate sealing head 312 and the intermediate central pipe 311 and the intermediate sealing sleeve 315, between the middle transfer pressure joint 323 and the intermediate sealing sleeve 315 and the pressure boosting sealing sleeve 322, between the lower transfer pressure joint 330 and the support sleeve 335, between the support sleeve 335 and the setting piston 336, and between the setting piston 336 and the lower joint 338 are all sealed by rubber rings 303.

[0047] The downhole large-capacity battery 348 adopts a parallel mode of several pieces. If one fails, other battery groups will be immediately activated. This battery can supply power to the external pipe flowmeter 316, the pressure boosting motor 317, the pressure relief motor 319, and the downhole pressure receiver 347.

[0048] The PLC circuit board can receive the signals of the external pipe flowmeter 316, the pressure boosting motor 317, the pressure relief motor 319, and the downhole pressure receiver 347, and has a certain algorithm. It can control the operation of the pressure boosting motor 317 and the pressure relief motor 319 in real time according to the signals fed back from the ground and the flow signals measured downhole.

[0049] The downhole pressure receiver 347 can receive the changes in the wellbore pressure and immediately feedback the pressure changes to the PLC circuit. After analysis, it makes a decision to control the pressure boosting motor 317 and the pressure relief motor 319.

[0050] Its working principle is as follows: According to the wellbore signals transmitted from the ground, the wellbore signals include the address signals and action signals of the packer. After the downhole pressure receiver 347 receives the corresponding signals, it commands the pressurizing motor 317 or / and the pressure-relieving motor 319 to act. When setting the packer, first rotate the pressure-relieving motor 319 forward to push the rotating assembly 320 and the pressurizing seal sleeve 322 downward to close the pressure-relieving channel 345. Then rotate the pressurizing motor 317 forward to drive the plunger pump 318 to increase the pressure, output high-pressure hydraulic oil. After entering the setting mechanism, it pushes the setting piston 336 upward to compress the setting rubber barrel 333, realizing the setting of the packer. During this period, the external pipe flowmeter 316 transmits the monitored flow data to the PLC circuit in real time. When the test flow rate is within the range of ≤ flow rate Q ≤.L / min, it is determined that the packer is set well and the rotation stops; otherwise, continue to rotate until the packer is tightly sealed. When releasing the packer, first rotate the pressurizing motor 317 in reverse to stop pressurizing the plunger pump 318. At this time, control the pressure-relieving motor 319 to rotate in reverse to push the rotating assembly 320 and the pressurizing seal sleeve 322 upward to open the pressure-relieving channel 345. The high-pressure hydraulic oil is discharged from the inside of the packer, and the setting rubber barrel 333 rebounds under its own action, realizing the release of the packer.

[0051] Embodiment 3

[0052] A method for using a cableless intelligent packer 3, successively lowering the plug 1, water distributor 2, cableless intelligent packer 3, tubing 4, wellhead 5, and pressure pulse generator 6. Since the ground pressure pulse generator 6 can automatically generate pulse signals according to the settings of the management personnel, when stratified water injection is required, the cableless intelligent packer 3 needs to be set. The management personnel set and start the setting mode, and automatically send setting commands to the downhole packers in the form of wireless pulses. The downhole cableless intelligent packer 3 can complete the setting procedure according to the pre-set program. When backwashing the well is required, the cableless intelligent packer 3 needs to be released. The management personnel set and start the release mode, and automatically send release commands to the downhole packers in the form of wireless pulses. The downhole cableless intelligent packer 3 can complete the release procedure according to the pre-set program.

[0053] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

[0054] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further descriptions of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A cable-free intelligent packer, comprising a downhole oil supply mechanism, an upper connecting pipe, an external flow meter, an intermediate central pipe, a pressure-increasing and pressure-relieving mechanism, a connector, and a hydraulic setting mechanism, which are connected in sequence, characterized in that: The boost and pressure relief mechanism mainly includes an intermediate sealing head, a circuit skeleton, a PLC circuit, a downhole pressure receiver, a downhole large-capacity battery, an intermediate sealing sleeve, an external flow meter, a boost motor, a plunger pump, a pressure relief motor, a rotating assembly, a pressure relief plunger, a boost sealing sleeve, a middle pressure transmission joint, a sealing pipeline, a pressure relief pipeline, a three-way joint, a sealing joint, and a sealing channel.

2. A cable-free intelligent packer according to claim 1, characterized in that: The circuit skeleton is fixed to the outside of the upper central tube, the PLC circuit board and the downhole pressure receiver are placed on the circuit skeleton, and the downhole large-capacity battery is fixed to the outside of the upper central tube; the booster motor and the plunger pump are combined into a booster unit; the pressure relief motor, the rotating assembly and the pressure relief plunger are combined into a pressure relief unit.

3. A cable-free intelligent packer according to claim 2, characterized in that: The pressure relief plunger is placed inside the boost sealing sleeve, the inside of the middle pressure transmission joint is threadedly connected to the outside of the middle center tube, the outside of the middle pressure transmission joint is threadedly connected to the middle sealing sleeve, the sealing pipeline is connected to the output end of the plunger pump, the pressure relief pipeline is connected to the output end of the pressure relief unit, the three-way joint can connect the sealing pipeline and the pressure relief pipeline at the same time, the sealing pipeline is connected to the sealing joint, the upper part of the connector is threadedly connected to the inside of the middle pressure transmission joint, and the lower part of the connector is threadedly connected to the inside of the lower pressure transmission joint.

4. The cable-free intelligent packer according to claim 1, characterized in that: The hydraulic setting mechanism comprises a lower pressure transmission joint, a lower center pipe, an adjusting ring, a setting rubber cylinder, a spacer ring, a supporting sleeve, a setting piston, a lower joint, a starting shear pin, and a short joint.

5. The cable-free intelligent packer according to claim 4, characterized in that: A sealing passage is arranged inside the lower pressure-transmitting joint, the upper end of the lower center tube is threadedly connected to the inner part of the lower pressure-transmitting joint, the support sleeve is threadedly connected to the lower pressure-transmitting joint, the adjusting ring is threadedly connected to the lower pressure-transmitting joint, the sealing rubber cylinder, the adjusting ring and the sealing rubber cylinder are sequentially placed on the outer end of the support sleeve, the sealing piston is placed outside the lower center tube and is fixed to the lower joint by starting shear nails, and the short section is threadedly connected to the lower joint.

6. A cable-free intelligent packer according to any one of claims 1 to 5, characterized in that: The pressure-increasing and pressure-relieving mechanism further includes a hydraulic oil input end, a hydraulic oil high-pressure output end, an injection channel, a pressure-relieving input end, a pressure-relieving output end, and a pressure-relieving channel.

7. The cable-free intelligent packer according to claim 6, characterized in that: The hydraulic oil high-pressure output end is connected to the sealing joint through a hydraulic control pipeline, the pressure relief pipeline is connected to the pressure relief input end, and the pressure relief output end is connected to the oil return joint through a pipeline.

8. The cable-free intelligent packer according to claim 7, characterized in that: Rubber rings are used to seal the upper center tube and the upper sealing head, the upper sealing head and the upper sealing sleeve, the movable piston and the upper sealing sleeve and the upper center tube, the pressure-transmitting joint and the upper sealing sleeve and the upper connecting tube, the middle sealing head and the middle center tube and the middle sealing sleeve, the middle pressure-transmitting joint and the middle sealing sleeve and the booster sealing sleeve, the lower pressure-transmitting joint and the supporting sleeve, the supporting sleeve and the setting piston, and the setting piston and the lower joint.

9. A cable-free intelligent packer according to claim 7 or 8, characterized in that: The downhole large-capacity batteries are several blocks in parallel mode, which are used to power the external flow meter, booster motor, pressure relief motor and downhole pressure receiver; the PLC circuit board is used to receive signals from the external flow meter, booster motor, pressure relief motor and downhole pressure receiver, and control the operation of the booster motor and the pressure relief motor in real time according to the signals fed back from the ground and the flow signals of the downhole test; the downhole pressure receiver is used to receive the changes in the wellbore pressure, and feed back the pressure changes to the PLC circuit in real time to control the booster motor and the pressure relief motor.

10. The method for using a cable-free intelligent packer according to claim 9, characterized in that: include: The wire plug, water distributor, cable-free intelligent packer, oil pipe, wellhead and pressure pulse generator are put into the well in sequence. The pressure pulse generator on the ground is set by the management personnel to automatically generate pulse signals. When stratified water injection is required, the setting mode is started, and the setting command is issued to the packers in each layer underground through wireless pulses. The cable-free intelligent packer in the well executes the setting procedure according to the preset procedure. When backwashing the well is required, the unsealing mode is started, and the unsealing command is issued to the packers in each layer underground through wireless pulses. The cable-free intelligent packer in the well executes the unsealing procedure according to the preset procedure.

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