Flexible composite pipe separate injection pipe column and process method

Abstract

The invention belongs to the technical field of oilfield water injection, and particularly provides a flexible composite pipe separate injection tubular column and a technological method. A first conversion connector, a flexible composite pipe, a second conversion connector, a first electric packer, a first steel anti-corrosion oil pipe, a first wave code communication water distributor, a second steel anti-corrosion oil pipe, a second electric packer, a third steel anti-corrosion oil pipe, a second wave code communication water distributor, a fourth steel anti-corrosion oil pipe, a preset working barrel, a double-acting valve, an eye pipe and a screwed plug are connected from top to bottom. The problems of high cost, difficulty in packer setting and low fine management level in an existing separate injection pipe column are solved, effective setting under the water injection pressure condition of a separate injection well is achieved, the cost is low, the intelligent management level of a separate injection well is improved, and the fine management level is high.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield water injection, and in particular relates to a flexible composite pipe injection column and a process method. Background Art

[0002] Changqing Oilfield is mainly developed by water injection, and the water sources are clean water and produced water. The reinjection of treated produced water has become an important way to reduce pollution, ensure the sustainable development of oilfields and improve the economic benefits of oilfields. Generally, the quality of produced water is poor, with high mineralization, iron bacteria, saprophytes, etc., which makes the produced water highly corrosive and the service life of the pipe string short. According to the statistics of the mine, the injection pipe column of the produced water reinjection well of Changqing Oilfield adopts the oil pipe with internal anti-corrosion coating, which generally corrodes and perforates in 3 to 4 years, and its service life is short.

[0003] With the improvement of refined requirements for oilfield development and management, the number of produced water injection wells has increased year by year, and the anti-corrosion requirements for the injection string have been further improved. Through searching, a flexible composite pipe injection string (patent number: ZL201220088283.6) was found. The string combination uses a flexible composite pipe + packer + prefabricated working cylinder + water injection sleeve + thread plug. The packer in the string can be set at will within 30m above the top of the oil layer, without precise positioning, which can effectively slow down the corrosion of the oil pipe and is only suitable for produced water injection wells. The flexible composite pipe is made of non-metallic materials, and the elongation of the pipe string is much larger than that of the steel oil pipe, and the elongation is nonlinearly related to the length and pressure of the oil pipe. The actual depth and injection pressure of each water injection well are different, which is more unfavorable for determining the position of the downhole packer of the injection well, and is not suitable for the injection well.

[0004] A downhole flexible composite tubing bridge concentric injection string (patent number: ZL 201520666552.6) is used for produced water injection wells. However, after the injection string is put into the well, it is necessary to conduct magnetic positioning to a deeper depth by a logging vehicle on each well, and then conduct magnetic positioning to a deeper depth again after pressure setting by a cement truck to ensure that the sealing position of the packer is within a reasonable range. If the packer is not set at the required position, it is necessary to unseal the string, replace the packer, and re-enter it, and then repeat the positioning-setting-positioning process before the well completion operation can be carried out. The construction process is complicated and not suitable for popularization and application. A flexible composite pipe with built-in cable downhole stratified direct reading control string (patent number: ZL 201822169243.4), a composite pipe stratified water injection intelligent control system (patent number: ZL201820764643.7), a continuous non-metallic pipe with built-in cable intelligent rotation water injection device (patent number: ZL201921423120.7), an oil field stratified water injection process string device (patent number: ZL 201920159643.9) are all anti-corrosion strings suitable for injection wells. They all use a combination of cable-laid flexible composite pipes, cable-through packers and cable-controlled intelligent water distributors to achieve different functions. The injection string realizes the functions of free measurement and adjustment, data monitoring, recording and transmission. The disadvantage of the injection string is that the cost is high, which is more than three times the cost of conventional injection strings, and the packer positioning and setting are different from a downhole flexible composite oil pipe bridge concentric injection string (patent number: ZL 201520666552.6) The positioning and setting of the packer is as cumbersome as that of the traditional packer. The economic application of the packer in low-permeability oilfields with small water volume is not strong, and it is only suitable for the encrypted dynamic data acquisition and tracking of key wells. Therefore, it is urgent to design a split injection string to solve the problems of high string cost and difficult positioning of the packer, and realize automatic measurement and adjustment, pressure, flow, temperature and other data monitoring, recording and transmission. In this way, the anti-corrosion ability of the produced water injection string is improved, the validity period of the split injection string is extended, the manual measurement and adjustment is eliminated, the qualified rate of water injection is improved, and the level of fine management of oil reservoirs is improved. Summary of the invention

[0005] The invention provides a flexible composite pipe injection string and a process method, aiming to overcome the problems of high cost, difficult setting of packers and low level of refined management in the injection string in the prior art.

[0006] To this end, the present invention provides a flexible composite pipe injection string, which is connected from top to bottom by a conversion joint, a flexible composite pipe, a conversion joint, an electric packer, a steel anti-corrosion oil pipe, a wave code communication water distributor, a steel anti-corrosion oil pipe, an electric packer, a steel anti-corrosion oil pipe, a wave code communication water distributor, a steel anti-corrosion oil pipe, a preset working cylinder, a double-acting valve, an eye tube and a screw plug.

[0007] Preferably, the flexible composite pipe is a non-metallic continuous composite pipe.

[0008] Preferably, the non-metallic continuous composite pipe comprises an inner pipe layer, a pressure-resistant layer, a tensile layer and an outer protective layer, and the inner pipe layer, the pressure-resistant layer, the tensile layer and the outer protective layer are sequentially sleeved from the inside to the outside.

[0009] Preferably, the inner tube layer and the outer protective layer are both high molecular polymer layers, the compression layer is a high-strength fiber layer formed by cross-weaving or winding, and the tensile layer is formed by high-strength fibers or steel wire ropes connected in parallel along the length direction of the oil pipe.

[0010] Preferably, the number of layers of the compression-resistant layer is an even number and the cross-weaving or winding directions of two adjacent layers are opposite.

[0011] Preferably, the high-strength fiber is one or more of polyester fiber, glass fiber, aramid fiber and carbon fiber.

[0012] Preferably, it also includes an anti-slip ring and an external locking device, and the conversion joint 1 and the conversion joint 2 are both connected to the flexible composite pipe through the anti-slip ring and the external locking device.

[0013] Preferably, the electric packer 1 and the electric packer 2 are both battery-powered delayed pressure differential electric packers.

[0014] Preferably, the wave code communication water distributor one and the wave code communication water distributor two receive the wave code signal and decode it to obtain the instruction information, adjust the water nozzle opening in the wave code communication water distributor one and the wave code communication water distributor two according to the instruction requirements, and collect and record data information according to the pressure wave generated by adjusting the water nozzle opening and transmit it remotely.

[0015] A process method based on the flexible composite pipe injection column comprises the following steps:

[0016] The flexible composite pipe injection string is lowered to the target position, the conversion joint 1 is connected to the water injection wellhead equipment, the electric packer 1 and the electric packer 2 are set, and the ground controller controls the water injection steady flow valve group to inject water into the flexible composite pipe injection string. The instantaneous opening and closing of the solenoid valve in the water injection steady flow valve group causes the water pressure in the water injection pipeline to produce pressure fluctuations, thereby generating a pressure wave code. The pressure wave code passes through the conversion joint 1, the flexible composite pipe, the conversion joint 2, the electric packer 1, the steel anti-corrosion oil pipe 1, the wave code communication water distributor 1, the steel anti-corrosion oil pipe 2, the electric packer 2, the steel anti-corrosion oil pipe 3 and the wave code communication water distributor 2 with water as the medium. The wave code communication water distributor 1 and the wave code communication water distributor 2 receive the wave code signal and decode it to obtain the instruction information, adjust the water nozzle opening in the wave code communication water distributor 1 and the wave code communication water distributor 2 according to the instruction requirements, collect and record data information according to the pressure wave generated by adjusting the water nozzle opening, and transmit it remotely to the ground controller until the water injection is completed;

[0017] When backwashing the well, the flushing fluid is injected into the annulus of the outer casing of the flexible composite pipe injection string, and returns to the ground after passing through the eye tube, double-acting valve, preset working cylinder, steel anti-corrosion oil pipe No. 4, wave code communication water distributor No. 2, steel anti-corrosion oil pipe No. 3, electric packer No. 2, steel anti-corrosion oil pipe No. 2, wave code communication water distributor No. 1, steel anti-corrosion oil pipe No. 1, electric packer No. 1, conversion joint No. 2, flexible composite pipe and conversion joint No. 1, to complete the backwashing of the well.

[0018] Beneficial effects of the present invention:

[0019] 1. The flexible composite pipe injection column and process provided by the present invention include a conversion joint, a flexible composite pipe, a conversion joint, an electric packer, a steel anti-corrosion oil pipe, a wave code communication water distributor, a steel anti-corrosion oil pipe, an electric packer, a steel anti-corrosion oil pipe, a wave code communication water distributor, a steel anti-corrosion oil pipe, a preset working cylinder, a double-acting valve, an eye tube and a screw plug. The flexible composite pipe injection column has fewer joints, can save installation time, and improve completion efficiency; the flexible composite pipe has strong anti-corrosion performance, can effectively slow down the corrosion of the oil pipe, and prolong the service life of the column. life; the electric packer 1 and the electric packer 2 realize the timed automatic sealing and unsealing functions, the sealing and unsealing are simple, and the purpose of effectively separating the reservoir and the effective recovery of the rubber cartridge when drilling to avoid drill sticking accidents are achieved; the wave code communication water distributor 1 and the wave code communication water distributor 2 realize the flow test and allocation, pressure, flow, temperature and other data monitoring and recording and data transmission functions. The flexible composite pipe injection string has the functions of realizing effective sealing under the injection pressure conditions of the injection well, automatic flow measurement and adjustment, pressure and temperature monitoring and transmission, which improves the intelligent management level of stratified water injection wells and has a high level of refined management.

[0020] 2. The flexible composite pipe injection string provided by the present invention is a non-metallic continuous composite pipe with corrosion resistance twice that of ordinary steel oil pipes. It is a continuous flexible composite pipe. Theoretically, it can be processed in any length required. The single pipe is long, which simplifies the construction process, has good corrosion resistance, and extends the service life of the pipe string.

[0021] 3. The flexible composite pipe injection column provided by the present invention, the wave code communication water distributor one and the wave code communication water distributor two receive the wave code signal and decode it to obtain the instruction information, adjust the water nozzle opening in the wave code communication water distributor one and the wave code communication water distributor two according to the instruction requirements, collect and record data information according to the pressure wave generated by adjusting the water nozzle opening and transmit it remotely, so as to meet the requirements of refined water injection volume and have a high degree of intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 It is a structural schematic diagram of a flexible composite pipe injection string;

[0024] Figure 2 It is a schematic diagram of the structure of the electric packer 1 and the electric packer 2.

[0025] Explanation of reference numerals: 1-1, conversion joint 1; 1-2, conversion joint 2; 2, flexible composite pipe; 3-1, electric packer 1; 3-2, electric packer 2; 3-3, wire protector; 3-4, lower joint; 3-5, circuit switch; 3-6, battery circuit; 3-7, wire; 3-8, electric control valve; 3-9, rubber cylinder; 3-10, upper joint; 3-11, electric control valve core; 3-12, electric control valve seat; 3-13, sealing pin; 3-14, locking ring; 3-15, pressure sleeve; 3-16, retaining spring Seat; 3-17, retaining ring; 3-18, unsealing pin; 3-19, retaining ring sleeve; 3-20, setting piston; 3-21, booster chamber sleeve; 3-22, fixing ring; 3-23, push ring; 3-24, center pipe; 4-1, steel anti-corrosion oil pipe one; 4-2, steel anti-corrosion oil pipe two; 4-3, steel anti-corrosion oil pipe three; 4-4, steel anti-corrosion oil pipe four; 5-1, wave code communication water distributor one; 5-2, wave code communication water distributor two; 6, preset working cylinder; 7, double-acting valve; 8, eye tube; 9, thread plug. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings.

[0027] Embodiment 1:

[0028] like Figure 1 As shown, a flexible composite pipe injection string includes a conversion joint 1-1, a flexible composite pipe 2, a conversion joint 2 1-2, an electric packer 3-1, a steel anticorrosive oil pipe 1 4-1, a wave code communication water distributor 1 5-1, a steel anticorrosive oil pipe 2 4-2, an electric packer 2 3-2, a steel anticorrosive oil pipe 3 4-3, a wave code communication water distributor 2 5-2, a steel anticorrosive oil pipe 4 4-4, a preset working cylinder 6, a double-acting valve 7, and an eye tube 8 And the thread plug 9, the conversion joint 1-1, the flexible composite pipe 2, the conversion joint 2 1-2, the electric packer 1 3-1, the steel anti-corrosion oil pipe 1 4-1, the wave code communication water distributor 1 5-1, the steel anti-corrosion oil pipe 2 4-2, the electric packer 2 3-2, the steel anti-corrosion oil pipe 3 4-3, the wave code communication water distributor 2 5-2, the steel anti-corrosion oil pipe 4 4-4, the preset working cylinder 6, the double-acting valve 7, the eye tube 8 and the thread plug 9 are connected in sequence from top to bottom.

[0029] The flexible composite pipe injection string has fewer joints, which can save installation time and improve completion efficiency. The flexible composite pipe 2 has strong anti-corrosion performance, can effectively slow down oil pipe corrosion and extend the service life of the string. The electric packer 3-1 and the electric packer 3-2 realize the timed automatic sealing and unsealing functions, and the sealing and unsealing are simple, while achieving the purpose of effectively separating the reservoir and effectively recovering the rubber cartridge when drilling to avoid drill sticking accidents. The wave code communication water distributor 5-1 and the wave code communication water distributor 5-2 realize flow test and adjustment, pressure, flow, temperature and other data monitoring and recording and data transmission functions. The flexible composite pipe injection string has the functions of realizing effective sealing under the injection pressure conditions of the injection well, automatic flow measurement and adjustment, pressure and temperature monitoring and transmission, which improves the intelligent management level of stratified injection wells and has a high level of refined management.

[0030] During the lowering of the tubing string, the double-acting valve 7 prevents the wellbore liquid from entering the flexible composite tubing injection string. After the flexible composite tubing injection string is lowered to the predetermined depth, the inner part of the tubing is pressurized to seal the packer, preventing the tubing liquid from entering the outside of the tubing; during normal water injection and backwashing operations, the liquid outside the tubing is allowed to enter the tubing.

[0031] Embodiment 2:

[0032] On the basis of Example 1, the flexible composite pipe 2 is a non-metallic continuous composite pipe.

[0033] Flexible composite pipe 2 is a non-metallic continuous composite pipe, and its anti-corrosion performance is twice that of ordinary steel oil pipes. It is a continuous flexible composite pipe. Theoretically, it can be processed as long as needed. The long length of a single pipe simplifies the construction process, has good anti-corrosion performance, and extends the service life of the pipe column. In view of the height limit of the highway and the width limit of the vehicle during transportation, the processing length of a single pipe is generally about 1,000 meters.

[0034] Preferably, the non-metallic continuous composite pipe comprises an inner pipe layer, a pressure-resistant layer, a tensile layer and an outer protective layer, and the inner pipe layer, the pressure-resistant layer, the tensile layer and the outer protective layer are sequentially sleeved from the inside to the outside.

[0035] The non-metallic continuous composite pipe of this structure has better compression resistance and tensile resistance.

[0036] Preferably, the inner tube layer and the outer protective layer are both high molecular polymer layers, the compression layer is a high-strength fiber layer formed by cross-weaving or winding, and the tensile layer is formed by high-strength fibers or steel wire ropes connected in parallel along the length direction of the oil pipe.

[0037] Since the inner tube layer and the outer protective layer are exposed to the erosion of liquid, the inner tube layer and the outer protective layer are made of polymer layers, which have good impact strength and wear resistance, good oil resistance, water resistance and chemical stability. The polymer layer is made of polymer materials, such as acrylonitrile-butadiene-styrene terpolymer, etc., or other types of polymer materials can be selected according to actual conditions to meet the use requirements. On the basis of the strength of the high-strength fiber layer, the compression layer formed by cross-weaving or winding further enhances the strength of the fiber layer and increases the compression resistance. The tensile layer formed by parallel connection of high-strength fibers or steel wire ropes along the length of the oil pipe has the best tensile effect.

[0038] Preferably, the number of layers of the compression-resistant layer is an even number and the cross-weaving or winding directions of two adjacent layers are opposite. The opposite directions balance the forces.

[0039] Preferably, the high-strength fiber is one or more of polyester fiber, glass fiber, aramid fiber and carbon fiber.

[0040] Polyester fiber has high modulus, high strength, high elasticity, good shape retention and heat resistance; glass fiber has good insulation, good corrosion resistance, high mechanical strength and high tensile strength; aramid fiber has ultra-high strength, high modulus and high temperature resistance, acid and alkali resistance, light weight, insulation, aging resistance and long life cycle; carbon fiber is resistant to high temperature, friction, heat conduction, corrosion resistance and high strength; you can choose according to the mechanical properties of the pipe string when using it.

[0041] Embodiment 3:

[0042] On the basis of Example 2, an anti-slip ring and an external locking device are also included, and the conversion joint 1-1 and the conversion joint 2 1-2 are both connected to the flexible composite pipe 2 through the anti-slip ring and the external locking device.

[0043] The anti-slip ring and the external locking device can quickly and stably connect the conversion joint 1-1 and the conversion joint 2 1-2 to the flexible composite pipe 2.

[0044] Preferably, the external locking device is an external locking sleeve, an anti-slip groove is provided on the outer side of the anti-slip ring, and the anti-slip ring is connected in the anti-slip groove.

[0045] In specific operation, the conversion joint 1-1 or the conversion joint 2 1-2 is inserted into the flexible composite pipe 2, the anti-slip ring is connected in the anti-slip groove, the flexible composite pipe 2 is connected between the anti-slip groove and the anti-slip ring, and then the outer locking sleeve is sleeved on the outer side of the anti-slip ring, and after pressurizing and locking on the pressurizing machine, the press buckle connection of the flexible composite oil pipe is completed, and the conversion joint 1-1 or the conversion joint 2 1-2 and the flexible composite oil pipe column are quickly connected to each other. The structure is simple, and the connection is simple, stable, and leak-proof, and the sealing is good.

[0046] Embodiment 4:

[0047] Based on Example 3, the electric packer 1 3 - 1 and the electric packer 2 3 - 2 are both battery-powered delayed pressure differential electric packers.

[0048] The battery-powered delayed differential pressure electric packer can complete the setting under the water injection pressure, eliminating the need for high-pressure pump trucks to set the packer on conventional water injection packers, thereby improving the operation efficiency. At the same time, the packer also has two unblocking functions: electric and lifting, which overcomes the problem of drill bit jamming caused by failure of single unblocking of conventional packers.

[0049] Preferably, Figure 2 As shown, the electric packer 1 3-1 and the electric packer 2 3-2 both include a wire protector 3-3, a lower joint 3-4, a circuit switch 3-5, a battery circuit 3-6, a wire 3-7, an electric control valve 3-8, an electric control valve core 3-11, an electric control valve seat 3-12, a sealing pin 3-13, a locking ring 3-14, a pressure sleeve 3-15, a retaining spring seat 3-16, a retaining spring 3-17, an unsealing pin 3-18, a retaining spring sleeve 3-19, a sealing piston 3-20, a booster chamber sleeve 3-21, a fixing ring 3-22, a push ring 3-23, a center pipe 3-24, a rubber cylinder 3-9, and an upper joint 3-10.

[0050] The lower end of the upper joint 3-10 is connected to the central tube 3-24, and the outer wall of the central tube 3-24 located below the upper joint 3-10 is covered with a rubber sleeve (3-9) and a push ring 3-23 in sequence; the fixed ring 3-22 below the push ring 3-23 is connected to the middle of the central tube 3-24, the outer wall of the fixed ring 3-22 is connected to the booster chamber sleeve 3-21 with radial holes on the tube wall, and the lower part of the booster chamber sleeve 3-21 is connected to the sealing piston 3-20; the inner wall of the sealing piston 3-20 is connected to the central tube 3-24 The central tube 3-24; a pressurized air cavity is formed between the central tube 3-24, the fixing ring 3-22, the pressurized cavity sleeve 3-21 and the setting piston 3-20; the lower end of the setting piston 3-20 is connected to the inner wall middle and lower section of the circlip sleeve (3-19 with a horse tooth buckle; a circlip seat 3-16 is provided between the upper part of the circlip sleeve 3-19 and the central tube 3-24; an unsealing pin 3-18 is connected between the upper part of the circlip seat 3-16 and the central tube 3-24; the lower outer wall of the circlip seat 3-16 is grooved, and a strip is provided in the middle The retaining ring 3-17 of the horse tooth buckle; the outer wall of the lower part of the retaining ring sleeve 3-19 is connected to the pressure sleeve 3-15; the lower part of the retaining ring sleeve 3-19 is connected to the lock ring 3-14; the pressure sleeve 3-15 is connected to the center pipe 3-24 through the sealing pin 3-13 passing through the lock ring 3-14; an electric control valve seat 3-12 is provided below the sealing pin 3-13; the outer wall of the electric control valve seat 3-12 is connected to the pressure sleeve 3-15, and the inner wall is connected to the center pipe 3-24, and a sealing ring is provided between the connecting surfaces; the electric control The middle of the lower part of the valve seat 3-12 is connected to the electric control valve core 3-11, and a sealing ring is provided between the connecting surfaces; the lower part of the electric control valve core 3-11 is in point contact with the electric control valve 3-8; the lower end surface of the electric control valve 3-8 is connected to the battery circuit 3-6 through the wire 3-7; the electric control valve 3-8 and the battery circuit 3-6 are both welded to the center tube 3-24; the lower part of the pressure sleeve 3-15 is internally connected to the lower joint 3-4, and the upper part of the lower joint 3-4 is internally connected to the center tube 3-24; the lower part of the lower joint 3-4 is externally connected to the protective wire 3-3.

[0051] After the wire protector 3-3 is removed, the spring 5 pushes the circuit switch to open, the circuit is connected, and the system enters the working state; the electric control valve 3-8 is started by delay control, that is, according to the preset time, the electric control valve core 3-11 opens, and the liquid enters the lower piston (sealing piston), generating an upward thrust, which cuts off the sealing pin, and the packer is ready for sealing.

[0052] An air booster chamber filled with low-pressure gas is located between the setting piston 3-20, the booster chamber sleeve 3-21, and the fixing ring 3-22; during normal water injection, the static liquid column pressure in the tubing string and the pressure in the air booster chamber act on the packer rubber cylinder, generating a pressure difference that compresses the rubber cylinder, thereby completing the setting.

[0053] Before the electric packer 1 3-1 and the electric packer 2 3-2 are lowered into the well, the wire guard is opened and the circuit is connected. When they are lowered to the predetermined position along with the injection tool string, water is injected normally. The electric control valve opens at a preset time, and the liquid in the oil pipe enters the lower piston to generate an upward thrust, shearing the pin, so that the packer has the conditions for setting. Under the dual effects of the static liquid column pressure and the compressed gas in the air boost chamber, a thrust is generated to compress the rubber cylinder, and the packer is set.

[0054] The present invention adds an electric sealing mechanism with delay and pressure difference control on the basis of a conventional hydraulic sealing packer. After the injection tool string is lowered to a predetermined position, water is injected normally. The electric control valve opens at a preset time, and the liquid in the oil pipe enters the lower piston to generate an upward thrust to shear off the pin, so that the packer has the conditions for sealing. Under the dual effects of the static liquid column pressure and the compressed gas in the air boost chamber, a thrust is generated to compress the rubber cylinder, and the packer is sealed, avoiding the need for a large high-pressure pump truck to pressurize the conventional hydraulic sealing packer to complete the sealing operation process, effectively improving the operating efficiency, and reducing the operating costs and risks.

[0055] Embodiment 5:

[0056] On the basis of Example 4, the wave code communication water distributor 1 5-1 and the wave code communication water distributor 2 5-2 receive the wave code signal and decode it to obtain the instruction information, adjust the water faucet opening in the wave code communication water distributor 1 5-1 and the wave code communication water distributor 2 5-2 according to the instruction requirements, and collect and record data information based on the pressure wave generated by adjusting the water faucet opening and transmit it remotely.

[0057] It meets the requirements of refined water injection volume and has a high degree of intelligence.

[0058] Specifically, the wave code communication water distributor 1 5-1 and the wave code communication water distributor 2 5-2 both include an upper joint of the water distributor, an outer protective tube, a battery module, a main controller module, a lower joint, a flow meter, a thermometer, a pressure monitoring sensor, a mechatronic faucet, and a central flow channel. The central flow channel and the outer protective tube are sequentially connected between the upper joint and the lower joint from the inside to the outside. The central flow channel is respectively connected to the battery module, the main controller module, the flow meter, the thermometer, the pressure monitoring sensor, and the mechatronic faucet, and the battery module, the main controller module, the flow meter, the thermometer, the pressure monitoring sensor, and the mechatronic faucet are all located between the central flow channel and the outer protective tube; the main controller module is electrically connected to the battery module, the flow meter, the thermometer, the pressure monitoring sensor, and the mechatronic faucet.

[0059] The battery module supplies power to the main controller module, flow meter, thermometer, pressure monitoring sensor and mechatronic faucet. The flow meter is used to collect flow information and send it to the main controller module. The thermometer is used to collect temperature information and send it to the main controller module. The pressure monitoring sensor is used to collect pressure information and send it to the main controller module. The main controller module receives the wave code signal and decodes it to obtain the instruction information. It adjusts the opening of the mechatronic faucet according to the instruction requirements. According to the pressure wave generated by the adjustment of the opening of the mechatronic faucet, it collects and records data information and transmits it remotely.

[0060] Embodiment 6:

[0061] On the basis of Example 2, a process method based on the flexible composite pipe injection string includes the following steps:

[0062] The flexible composite pipe distribution string is lowered to the target position, the conversion joint 1-1 is connected to the water injection wellhead equipment, the electric packer 3-1 and the electric packer 2 3-2 are set, and the ground controller controls the water injection steady flow valve group (existing device) to inject water into the flexible composite pipe distribution string. The instantaneous opening and closing of the solenoid valve in the water injection steady flow valve group causes the water pressure in the water injection pipeline to produce pressure fluctuations, thereby generating a pressure wave code. The pressure wave code passes through the conversion joint 1-1, the flexible composite pipe 2, the conversion joint 2 1-2, the electric packer 3-1, the steel anti-corrosion oil Pipe 1 4-1, wave code communication water distributor 1 5-1, steel anti-corrosion oil pipe 2 4-2, electric packer 2 3-2, steel anti-corrosion oil pipe 3 4-3 and wave code communication water distributor 2 5-2, wave code communication water distributor 1 5-1 and wave code communication water distributor 2 5-2 receive wave code signals and decode to obtain instruction information, adjust the water nozzle opening in wave code communication water distributor 1 5-1 and wave code communication water distributor 2 5-2 according to the instruction requirements, collect and record data information according to the pressure wave generated by adjusting the water nozzle opening, and transmit it remotely to the ground controller until the water injection is completed;

[0063] When backwashing the well, the flushing fluid is injected into the annulus of the outer casing of the flexible composite pipe injection string, passes through the eye tube 8, double-acting valve 7, preset working cylinder 6, steel anti-corrosion oil pipe 4-4, wave code communication water distributor 2 5-2, steel anti-corrosion oil pipe 3 4-3, electric packer 2 3-2, steel anti-corrosion oil pipe 2 4-2, wave code communication water distributor 1 5-1, steel anti-corrosion oil pipe 1 4-1, electric packer 1 3-1, conversion joint 2 1-2, flexible composite pipe 2 and conversion joint 1-1, and then returns to the ground to complete the backwashing of the well.

[0064] The pipe string is pulled out, injection is stopped between the water injection stabilizing valve groups, and special equipment for pressure-bearing operation of the flexible composite pipe injection pipe string is installed. The test gate at the water injection wellhead is opened, and after the preset working cylinder plugger is put into place, the test gate is connected to the high-pressure pump truck, and high-pressure pumping is performed to send the preset working cylinder plugger into the specified position in the preset working cylinder 6, and the channel in the oil pipe is closed. Stop the pump, and when the wellhead tubing pressure is zero, start the pressurized operation equipment, lift the flexible composite pipe 2 to unseal the electric packer 3-1 and the electric packer 3-2, and successively lift out the conversion joint 1-1, flexible composite pipe 2, conversion joint 1-2, electric packer 3-1, steel anti-corrosion oil pipe 4-1, wave code communication water distributor 5-1, steel anti-corrosion oil pipe 4-2, electric packer 3-2, steel anti-corrosion oil pipe 3 4-3, wave code communication water distributor 2 5-2, steel anti-corrosion oil pipe 4-4, preset working cylinder 6, double-acting valve 7, eye tube 8 and screw plug 9 to complete the lifting of the flexible composite pipe injection string.

[0065] The present invention meets the requirements of the stratified water injection process of produced water reinjection wells. The pipe string has low cost and is simple to position, seal and unseal. It can functionally realize automatic measurement and adjustment, pressure, flow, temperature and other data monitoring, recording and transmission, improve the injection qualification rate, effectively extend the maintenance-free period of the injection pipe string, reduce oil field maintenance costs, and improve oil field development effects.

[0066] In the description of the present invention, it is necessary to understand that if there are terms such as "upper" and "lower" indicating an orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention.

[0067] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design that is the same or similar to the present invention belongs to the protection scope of the present invention. The process or structure not described in detail in the specification belongs to the common knowledge of those skilled in the art and will not be described in detail here.

Claims

1. A flexible composite pipe injection string, characterized by: The device is connected from top to bottom by a conversion joint 1 (1-1), a flexible composite pipe (2), a conversion joint 2 (1-2), an electric packer 1 (3-1), a steel anti-corrosion oil pipe 1 (4-1), a wave code communication water distributor 1 (5-1), a steel anti-corrosion oil pipe 2 (4-2), an electric packer 2 (3-2), a steel anti-corrosion oil pipe 3 (4-3), a wave code communication water distributor 2 (5-2), a steel anti-corrosion oil pipe 4 (4-4), a preset working cylinder (6), a double-acting valve (7), an eye tube (8) and a screw plug (9).

2. The flexible composite pipe injection string according to claim 1, characterized in that: The flexible composite pipe (2) is a non-metallic continuous composite pipe.

3. The flexible composite pipe injection string according to claim 2, characterized in that: The non-metallic continuous composite pipe comprises an inner pipe layer, a pressure-resistant layer, a tensile layer and an outer protective layer, and the inner pipe layer, the pressure-resistant layer, the tensile layer and the outer protective layer are sleeved in sequence from the inside to the outside.

4. The flexible composite pipe injection string according to claim 3, characterized in that: The inner tube layer and the outer protective layer are both high molecular polymer layers, the compression layer is a high strength fiber layer formed by cross weaving or winding, and the tensile layer is formed by high strength fibers or steel wire ropes connected in parallel along the length direction of the oil pipe.

5. The flexible composite pipe injection string according to claim 4, characterized in that: The number of layers of the compression-resistant layer is an even number, and the cross-weaving or winding directions of two adjacent layers are opposite.

6. The flexible composite pipe injection string according to claim 3, characterized in that: The high-strength fiber is one or more of polyester fiber, glass fiber, aramid fiber and carbon fiber.

7. The flexible composite pipe injection string according to claim 1, characterized in that: It also includes an anti-slip ring and an external locking device, and the conversion joint 1 (1-1) and the conversion joint 2 (1-2) are both connected to the flexible composite pipe (2) through the anti-slip ring and the external locking device.

8. The flexible composite pipe injection string according to claim 1, characterized in that: The electric packer 1 (3-1) and the electric packer 2 (3-2) are both battery-powered delayed pressure differential electric packers.

9. The flexible composite pipe injection string according to claim 1, characterized in that: The wave code communication water distributor one (5-1) and the wave code communication water distributor two (5-2) receive the wave code signal and decode to obtain the instruction information, adjust the water nozzle opening in the wave code communication water distributor one (5-1) and the wave code communication water distributor two (5-2) according to the instruction requirements, and collect and record data information according to the pressure wave generated by adjusting the water nozzle opening and transmit it remotely.

10. A process for a flexible composite pipe injection column based on any one of claims 1 to 9, characterized in that: The steps include: The flexible composite pipe injection string is lowered to the target position, the conversion joint 1 (1-1) is connected to the water injection wellhead equipment, the electric packer 1 (3-1) and the electric packer 2 (3-2) are set, and the ground controller controls the water injection steady flow valve group to inject water into the flexible composite pipe injection string. The instantaneous opening and closing of the solenoid valve in the water injection steady flow valve group causes the water pressure in the water injection pipeline to fluctuate, thereby generating a pressure wave code. The pressure wave code is transmitted through the conversion joint 1 (1-1), the flexible composite pipe (2), the conversion joint 2 (1-2), the electric packer 1 (3-1), the steel anti-corrosion oil pipe 1 (4-1 ), wave code communication water distributor one (5-1), steel anti-corrosion oil pipe two (4-2), electric packer two (3-2), steel anti-corrosion oil pipe three (4-3) and wave code communication water distributor two (5-2), the wave code communication water distributor one (5-1) and the wave code communication water distributor two (5-2) receive the wave code signal and decode to obtain the instruction information, adjust the water nozzle opening in the wave code communication water distributor one (5-1) and the wave code communication water distributor two (5-2) according to the instruction requirements, collect and record data information according to the pressure wave generated by adjusting the water nozzle opening, and transmit it remotely to the ground controller until the water injection is completed; When backwashing the well, the well washing fluid is injected into the annulus of the outer casing of the flexible composite pipe injection string, passes through the eye tube (8), the double-acting valve (7), the preset working cylinder (6), the steel anti-corrosion oil pipe four (4-4), the wave code communication water distributor two (5-2), the steel anti-corrosion oil pipe three (4-3), the electric packer two (3-2), the steel anti-corrosion oil pipe two (4-2), the wave code communication water distributor one (5-1), the steel anti-corrosion oil pipe one (4-1), the electric packer one (3-1), the conversion joint two (1-2), the flexible composite pipe (2) and the conversion joint one (1-1), and then returns to the ground, completing the backwashing of the well.

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