Dropping and pulling type cable-free pressure-controlled separate injection system based on underground power generation and secondary energy storage technology

Abstract

The invention discloses a throwing and fishing type cable-free pressure-controlled separate injection system based on underground power generation and secondary energy storage technology, which comprises an oil pipe and a sleeve which are sleeved inside and outside, a screwed plug is arranged at the tail end of the oil pipe, a plurality of throwing and fishing cable-free pressure-controlled water distributors are arranged on the oil pipe, and a sealing packer is inserted between every two adjacent throwing and fishing cable-free pressure-controlled water distributors; a positioning seal is arranged above the topmost cable-free pressure-controlled water distributor capable of being thrown and fished, and a sliding sleeve is arranged outside the oil pipe above the positioning seal. According to the cable-free pressure-controlled two-way transmission system, two-way transmission between the underground and the ground is completed through pressure wave signals, charging and discharging circuit programs are started through pressure waves, the charging and discharging duration is controlled, and the service life of a battery is prolonged; the water nozzles are adjusted through electric energy generated underground, all layers are adjusted and tested, cable-free intelligent testing, adjusting and separate injection integration is achieved, the system is simple, and the cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent injection of water injection wells in offshore oil fields, and in particular relates to a castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology. Background Art

[0002] The cable intelligent measurement and adjustment layered water injection technology is not limited by the well inclination and can realize real-time testing and regulation. However, there are currently common problems such as the failure of data transmission and command release in long-term operation of cable measurement and adjustment under high temperature and high pressure environment, and the unreliable sealing contact between the cable and the electrical components in the well. At the same time, during the lowering of the pipe string, the technology requires the cable to be lowered along with the pipe string, which is complicated to operate and expensive. In order to overcome the shortcomings of the cable measurement and adjustment water injection technology, the cable-free water injection technology came into being.

[0003] Cable-free intelligent injection and production technology has the advantages of low cost and simple operation, and its control is not limited by well inclination. It is an effective supplement to cable-free intelligent injection and production technology. At present, cable-free pressure-controlled intelligent injection and production technology with pressure waves as signal carriers has been applied in offshore oil fields. However, the life of existing cable-free intelligent injection and production products is limited by battery life, which cannot meet the requirements of long-term dynamic monitoring of reservoirs, restricting the large-scale promotion of this technology. Summary of the invention

[0004] The present invention is proposed to solve the service life problem of cable-free intelligent injection products that rely solely on downhole battery systems for power supply in the prior art, as well as the failure of data transmission and command issuance during long-term operation of the current common cable-type measurement and adjustment method under high temperature and high pressure environments, and the unreliable sealing contact of the connection links between the cable and various electrical components downhole. Its purpose is to provide a castable cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology.

[0005] The present invention is achieved through the following technical solutions:

[0006] A castable and salvageable cableless pressure-controlled injection system based on downhole power generation and secondary energy storage technology, comprising an inner and outer tubing and casing, a screw plug is arranged at the end of the tubing, and a plurality of water distribution components are arranged on the tubing, wherein the water distribution components comprise a castable and salvageable cableless pressure-controlled water distributor and an insert seal packer, and the insert seal packer is arranged above the castable and salvageable cableless pressure-controlled water distributor; a positioning seal is arranged above the topmost water distribution component, a sliding sleeve is arranged outside the tubing above the positioning seal, and a screen tube is arranged outside the tubing below the positioning seal;

[0007] In the above technical solution, the inserted sealing packer is threadedly connected to the oil pipe.

[0008] In the above technical solution, the positioning seal is threadedly connected to the oil pipe; and the sliding sleeve is threadedly connected to the oil pipe.

[0009] In the above technical solution, the castable cable-free pressure-controlled water distributor is an integrated structure, which includes a lock core type salvaging head, a secondary energy storage unit, an electric control unit, a motor unit and an adjustable water nozzle arranged in sequence from top to bottom.

[0010] In the above technical solution, the secondary energy storage unit includes an energy storage segment shell, a downhole power generation system short section arranged in the energy storage segment shell, a rechargeable battery and a charging protection circuit; the downhole power generation system short section is arranged on a side close to the lock core type fishing head; the lock core type fishing head is threadedly connected to the outer shell of the downhole power generation system short section; the downhole power generation system short section is electrically connected to the rechargeable battery to realize power supply to the rechargeable battery.

[0011] In the above technical solution, the downhole power generation system pup section is an integrated downhole turbine generator having a large diameter central channel.

[0012] In the above technical solution, the electric control unit includes an electric control segment shell threadedly connected to the energy storage segment shell, the circuit board is fixed in the electric control segment shell, and a pressure sensor is arranged on the inner wall of the threaded connection section between the electric control segment shell and the energy storage segment shell.

[0013] In the above technical solution, the motor unit includes a motor housing threadedly connected to the housing of the electric control section, a motor arranged in the motor housing, the motor output shaft is connected to the motor connecting rod through a coupling, and the free end of the motor connecting rod is fixedly connected to the lead screw; a motor valve seat is sleeved on the lead screw, and the connection between the two is the connection between a lead screw and a lead screw nut; an anti-rotation groove is formed on the outer wall of the motor valve seat along the axial direction, a retaining groove is provided on the motor housing, a screw is provided in the retaining groove, and one end extends into the anti-rotation groove of the outer wall of the motor valve seat, thereby limiting the rotation of the motor valve seat and can only reciprocate in a straight line along the axis; the adjustable water nozzle is threadedly connected to the end of the motor valve seat away from the motor.

[0014] In the above technical solution, the motor is electrically connected to the rechargeable battery of the secondary energy storage unit through a circuit board.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a castable cableless pressure-controlled injection system based on underground power generation and secondary energy storage technology. The cableless pressure-controlled bidirectional transmission system completes bidirectional transmission between the underground and the ground through pressure wave signals. At the same time, the pressure wave can be used to start the charging and discharging circuit program and control the charging and discharging time, thereby extending the battery life and solving the service life problem of cableless intelligent injection products that rely solely on the underground battery system for power supply. The electric energy generated underground is used to adjust the water nozzle, and each layer is adjusted and tested to realize the integration of cableless intelligent measurement, adjustment and injection. The system is simple and low-cost, solving the problems of data transmission and command issuance failure during long-term operation of the current common cable-type measurement and adjustment method under high temperature and high pressure environment, as well as unreliable sealing contact in the connection link between the cable and each electrical component underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the cable-free pressure-controlled water distributor that can be cast and salvaged in the present invention;

[0019] Figure 3 is a circuit diagram of a charging protection circuit in the present invention;

[0020] Figure 4 It is a structural schematic diagram of the adjustable water nozzle in the present invention.

[0021] in:

[0022] 1. Tubing; 2. Casing; 3. Thread plug; 4. Insert seal packer; 5. Cable-free pressure-controlled water distributor; 6. Positioning seal; 7. Sliding sleeve; 8. Screen tube; 9. Working cylinder;

[0023] 51. Lock-core fishing head; 52. Downhole power generation system short section; 53. Secondary energy storage unit; 54. Pressure sensor; 55. Circuit board; 56. Motor; 57. Motor connecting rod; 58. Lead screw; 59. Motor valve seat; 510. Adjustable water nozzle; 511. Motor housing; 512. Screw; 5101. Water nozzle; 5102. Water nozzle short section.

[0024] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] like Figure 1As shown, a castable and salvageable cableless pressure-controlled injection system based on downhole power generation and secondary energy storage technology comprises an oil pipe 1 and a casing 2 which are arranged inside and outside the oil pipe, a screw plug 3 is arranged at the end of the oil pipe 1, and a plurality of water distribution components are arranged on the oil pipe 1, wherein the water distribution components comprise a castable and salvageable cableless pressure-controlled water distributor 5 and an insert seal packer 4, and the insert seal packer 4 is arranged above the castable and salvageable cableless pressure-controlled water distributor 5; a positioning seal 6 is arranged above the topmost water distribution component, a sliding sleeve 7 is arranged outside the oil pipe 1 above the positioning seal 5, and a screen tube 8 is arranged outside the oil pipe 1 below the positioning seal 5;

[0027] The insert seal packer 4 is threadedly connected to the oil pipe 1 and is a conventional commercially available product, generally a 4.75-inch insert seal;

[0028] The positioning seal 6 is threadedly connected to the oil pipe 1;

[0029] The sliding sleeve 7 is threadedly connected to the oil pipe 1. The sliding sleeve 7 is a sliding sleeve tool commonly found in water injection pipes in the art and is a conventional technology. The sliding sleeve itself can be switched on and off, and can be hydraulically controlled or electrically controlled.

[0030] like Figure 2 As shown, the castable cable-free pressure-controlled water distributor 5 is an integrated structure, which includes a lock core type fishing head 51, a secondary energy storage unit 53, an electric control unit, a motor unit and an adjustable water nozzle 510 arranged in sequence from top to bottom;

[0031] The secondary energy storage unit 53 includes an energy storage section housing, a downhole power generation system short section 52 disposed in the energy storage section housing, a rechargeable battery and a charging protection circuit; the downhole power generation system short section 52 is disposed on one side close to the lock core type fishing head 51,

[0032] The lock core type fishing head 51 is threadedly connected to the outer shell of the downhole power generation system short section 52;

[0033] The downhole power generation system sub 52 is an integrated downhole turbine generator with a large diameter central channel. Water flows into the interior from the side hole at the lock core type fishing head 51, and then passes through the downhole turbine generator. The generator starts the power generation mode, and no power and communication cables are required.

[0034] The downhole power generation system short section 52 is electrically connected to the rechargeable battery to realize power supply to the rechargeable battery; the charging protection circuit is integrated with the rechargeable battery and is a conventional commercial product;

[0035] The circuit diagram of the charging protection circuit is as follows: Figure 3 As shown, when the voltage of the rechargeable battery is lower than 3V, the charging protection circuit is turned on, and the downhole power generation system short section 52 is turned on to charge the rechargeable battery. When the voltage is higher than 3.6V, the charging protection circuit is disconnected.

[0036] The electric control unit includes an electric control section housing threadedly connected to the energy storage section housing, a circuit board 55 is fixed in the electric control section housing, and a pressure sensor 54 is arranged on the inner wall of the threaded connection section between the electric control section housing and the energy storage section housing; the pressure sensor 54 is used to test the pressure before and after the water nozzle, thereby obtaining the pressure change in the pipe column, and transmitting the pressure change signal to the circuit board 55;

[0037] The motor unit comprises a motor housing 511 threadedly connected to the housing of the electric control section, a motor 56 arranged in the motor housing 511, the output shaft of the motor 56 is connected to the motor connecting rod 57 through a coupling, and the free end of the motor connecting rod 57 is fixedly connected to the lead screw 58; a motor valve seat 59 is sleeved on the lead screw 58, and the connection between the two is the connection between a lead screw and a lead screw nut; an anti-rotation groove arranged axially is formed on the outer wall of the motor valve seat 59, a clamping groove is arranged on the motor housing, a screw is arranged in the clamping groove, and one end of the screw extends into the anti-rotation groove of the outer wall of the motor valve seat 59, thereby limiting the rotation of the motor valve seat and only allowing it to reciprocate in a straight line along the axis; an adjustable water nozzle 510 is threadedly connected to the end of the motor valve seat 59 away from the motor 56;

[0038] like Figure 4 As shown, the adjustable water nozzle 510 includes a water nozzle short section 5102 and a water nozzle 5101 which are sequentially connected to each other, the water nozzle short section 5102 is threadedly connected to the motor valve seat 59, and the notch on the side wall of the water nozzle 5101 corresponds to the notch on the motor housing 511;

[0039] The motor 56 is electrically connected to the rechargeable battery of the secondary energy storage unit 53 through the circuit board 55; after being fully charged through the circuit control of the circuit board 55, the rechargeable battery supplies power to the intelligent water distributor to control the water tap 57 switch, and when the power of the rechargeable battery is lower than a certain set value, the generator charging circuit is turned on;

[0040] The circuit board 55 is equipped with a control chip, which can convert the received signal into a control instruction, including start, motor forward rotation, motor reverse rotation, and stop; the adjustable water nozzle 57 completes the stepless opening regulation of the adjustable water nozzle 57 when the motor is in forward rotation, reverse rotation, and stop action; at the same time, the pressure wave can be used to start the generator 52 to charge and discharge the secondary energy storage unit 53 and control the charging and discharging time; after the circuit control of the circuit board 55 realizes full charging, the rechargeable battery supplies power to the intelligent water distributor to regulate the switch of the water nozzle 57, and when the power of the rechargeable battery is lower than a certain set value, the generator charging circuit is turned on;

[0041] The retrievable cable-free pressure-controlled water distributor 5 is dropped into the working cylinder connected to the oil pipe from the upper part through the steel wire operation; the lock core type fishing head 51 can be lowered into the corresponding layer through the steel wire operation to perform layered injection.

[0042] The method of using the present invention:

[0043] During water injection, the steel wire operation is carried out to lower the castable and cable-free pressure-controlled water distributor 5 to the corresponding layer, and the water flows through the downhole power generation system short section 52, and the downhole power generation system short section 52 works. When the power of the rechargeable battery is lower than a certain set value, the charging circuit of the downhole power generation system short section 52 is turned on to charge the secondary energy storage system 53; after the circuit control realizes full charging, the rechargeable battery supplies power to the intelligent water distributor to adjust the switch of the water nozzle 57 for stratified injection; at the same time, the pressure wave can be used to start the charging and discharging circuit program of the downhole power generation system short section 52 to the rechargeable battery and control the charging and discharging time. When the water injection volume of each layer needs to be adjusted, the pressure wave instruction is transmitted downward, and the pressure fluctuation generated in the oil pipe is transmitted to the cableless pressure-controlled water distributor 5 at each level, completing the opening adjustment of the adjustable water nozzle 57 of the cableless pressure-controlled water distributor; when it is necessary to read the water injection data of a certain layer, the wave instruction is also required to be transmitted downward, and the pressure wave instruction for reading the data is transmitted to the cableless pressure-controlled water distributor 5 of each layer, and the adjustable water nozzle 57 in the cableless pressure-controlled water distributor of the corresponding layer is actuated, forming a pressure wave signal carrying the downhole data. The system recognizes the pressure wave signal, reads the data, and monitors the flow, pressure, and temperature data.

[0044] The present invention no longer requires power and communication cables, thus solving the problems of failure of data transmission and command issuance during long-term operation in a high-temperature and high-pressure environment in the current common cable-type measurement and adjustment method, as well as unreliable sealing contact in the connection links between the cable and various electrical components underground. The present invention effectively solves the service life problem of cable-free intelligent injection technology that relies solely on power supply from an underground battery system through the combination of an underground power generation system and a secondary energy storage system, thereby extending the process implementation time and improving the adjustment efficiency.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0047] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A dredgeable cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology, characterized in that: The invention comprises an oil pipe (1) and a casing (2) which are arranged inside and outside the oil pipe (1). A threaded plug (3) is arranged at the end of the oil pipe (1). A plurality of water distribution components are arranged on the oil pipe (1). The water distribution components comprise a castable and cableless pressure-controlled water distributor (5) and an insert seal packer (4), and the insert seal packer (4) is arranged above the castable and cableless pressure-controlled water distributor (5). A positioning seal (6) is arranged above the topmost water distribution component. A sliding sleeve (7) is arranged outside the oil pipe (1) above the positioning seal (5), and a screen pipe (8) is arranged outside the oil pipe (1) below the positioning seal (5).

2. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 1 is characterized in that: The inserted sealing packer (4) is threadedly connected to the oil pipe (1).

3. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 1 is characterized in that: The positioning seal (6) is threadedly connected to the oil pipe (1); and the sliding sleeve (7) is threadedly connected to the oil pipe (1).

4. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 1 is characterized in that: The castable and cable-free pressure-controlled water distributor (5) is an integrated structure, comprising a locking core type fishing head (51), a secondary energy storage unit (53), an electric control unit, a motor unit and an adjustable water nozzle (510) which are arranged in sequence from top to bottom.

5. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 4 is characterized in that: The secondary energy storage unit (53) comprises an energy storage section housing, a downhole power generation system short section (52) arranged in the energy storage section housing, a rechargeable battery and a charging protection circuit; the downhole power generation system short section (52) is arranged on a side close to the lock core type fishing head (51); the lock core type fishing head (51) is threadedly connected to the outer shell of the downhole power generation system short section (52); the downhole power generation system short section (52) is electrically connected to the rechargeable battery to realize power supply to the rechargeable battery.

6. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 5 is characterized in that: The downhole power generation system pup joint (52) is an integrated downhole turbine generator having a large diameter central channel.

7. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 4 is characterized in that: The electric control unit comprises an electric control section housing threadedly connected to an energy storage section housing, a circuit board (55) is fixed in the electric control section housing, and a pressure sensor (54) is arranged on the inner wall of the threaded connection section between the electric control section housing and the energy storage section housing.

8. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 4 is characterized in that: The motor unit comprises a motor housing (511) threadedly connected to the housing of the electric control section, a motor (56) arranged in the motor housing (511), the output shaft of the motor (56) being connected to the motor connecting rod (57) via a coupling, the free end of the motor connecting rod (57) being fixedly connected to the lead screw (58); a motor valve seat (59) being sleeved on the lead screw (58), and the two being connected in the manner of a lead screw and a lead screw nut; an anti-rotation groove arranged axially is formed on the outer wall of the motor valve seat (59), a retaining groove is arranged on the motor housing, a screw is arranged in the retaining groove, and one end of the screw extends into the anti-rotation groove of the outer wall of the motor valve seat (59), thereby limiting the rotation of the motor valve seat and allowing it to reciprocate in a straight line along the axis; an adjustable water nozzle (510) is threadedly connected to one end of the motor valve seat (59) away from the motor (56).

9. The castable and cable-free pressure-controlled injection system based on downhole power generation and secondary energy storage technology according to claim 8 is characterized in that: The motor (56) is electrically connected to the rechargeable battery of the secondary energy storage unit (53) via a circuit board (55).

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