Structure for redundancy design of underground water nozzle

Abstract

The utility model discloses an underground water nozzle redundancy design structure which comprises a base, an upper water nozzle assembly, a lower water nozzle assembly, a water inlet and a sealing rod, the upper water nozzle assembly and the lower water nozzle assembly are oppositely installed on the base, the structure of the lower water nozzle assembly is the same as that of the upper water nozzle assembly, and the base is provided with a fluid channel. The fluid channel is arranged between the upper water nozzle assembly and the lower water nozzle assembly, the lower water nozzle assembly is provided with a valve rod, the valve rod is fixedly connected with the sealing rod and drives the sealing rod to slide up and down, the upper water nozzle assembly and the lower water nozzle assembly are respectively provided with an upper water outlet and a lower water outlet, and the water inlet is communicated with the fluid channel. The two water nozzle assemblies are of an overall parallel connection and local series connection structure, switching of the water nozzle assemblies is achieved through sliding of the sealing rod in the fluid channel, one water nozzle assembly serves as a backup, when the other water nozzle assembly fails, water can be effectively injected, and the overall reliability and fault tolerance are effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of intelligent stratified water injection in oilfield downhole, and particularly relates to a structure with a water nozzle redundancy design for downhole use. Background Art

[0002] In the later stage of oilfield development, the formation energy is continuously lost, resulting in a significant reduction in the oil recovery rate. Intelligent stratified water injection technology has been popularized and used in domestic oilfields. With the increasing number of intelligent water injection wells year by year, the probability of failure of existing downhole intelligent water injection controllers (hereinafter referred to as "water injection controllers") is still very high under harsh well conditions such as high temperature, high pressure, and high corrosion. To reduce the failure rate of water injection controllers, conventional measures such as improving the temperature rating of the instrument and enhancing the pressure resistance performance can be adopted. The most critical actuator in the downhole water injection controller is the electric water nozzle assembly, that is, controlling the forward and reverse rotation of the motor, driving the valve core to move back and forth through the transmission shaft, changing the area of the water outlet, and realizing the precise adjustment of the water injection volume for each layer. Existing single-layer water injection controllers generally adopt a single electric water nozzle assembly. When abnormalities occur in the motor, transmission chain, etc., the entire electric water nozzle assembly fails, thereby causing the failure of the single-layer water injection controller. Summary of the Invention

[0003] To solve the above problems, the utility model provides a structure with a water nozzle redundancy design for downhole use, adding a water nozzle assembly as a backup to ensure effective water injection after the failure of one water nozzle assembly, and improving the overall reliability and fault tolerance of the equipment.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: A structure with a water nozzle redundancy design for downhole use, including a base, an upper water nozzle assembly, a lower water nozzle assembly, an inlet, and a sealing rod. The upper water nozzle assembly and the lower water nozzle assembly are relatively installed on the base, and the structure of the lower water nozzle assembly is the same as that of the upper water nozzle assembly. The base is provided with a fluid channel, and the fluid channel is arranged between the upper water nozzle assembly and the lower water nozzle assembly. The lower water nozzle assembly is provided with a valve rod, and the valve rod and the sealing rod are fixedly connected and drive the sealing rod to slide up and down. The upper water nozzle assembly and the lower water nozzle assembly are respectively provided with an upper water outlet and a lower water outlet, and the inlet is communicated with the fluid channel.

[0005] The sealing rod is divided into a large-diameter section and a small-diameter section, and the large-diameter section and the small-diameter section are transitioned through a chamfer. The diameter of the large-diameter section is the same as the diameter of the small-diameter section of the fluid channel.

[0006] The large-diameter section is sleeved with a sealing ring.

[0007] The lower water nozzle assembly is connected with a one-way limiting mechanism. The one-way limiting mechanism includes a fixed seat, a spring, and a limiting pin. The fixed seat is fixedly installed on the base. The spring is respectively connected with the fixed seat and the limiting pin. The limiting pin is provided with a chamfer, and a corresponding chamfer is opened at the end of the valve rod.

[0008] The water inlet nozzle assembly and the water outlet nozzle assembly are respectively provided with an upper water inlet and a lower water inlet, and the water inlet serves as a water outlet and is communicated with the fluid passage.

[0009] Advantages of the utility model:

[0010] (1) The utility model adopts a double water nozzle assembly, one of which serves as a backup. When one water nozzle assembly fails, effective water injection can be achieved, effectively improving the overall reliability and fault tolerance.

[0011] (2) The two water nozzle assemblies of the utility model present an overall parallel and partial series structure. The switching of the water nozzle assembly is realized by the sliding of the sealing rod in the fluid passage, ensuring that the water flow will only flow out from the water outlet of one water nozzle assembly. Description of the drawings

[0012] The following further illustrates the utility model with reference to the drawings:

[0013] Figure 1 It is a working schematic diagram of the upper water nozzle of the utility model;

[0014] Figure 2 It is a working schematic diagram of the lower water nozzle of the utility model;

[0015] Figure 3 For Figure 2 The partial schematic diagram of;

[0016] In the figure: 1, base; 2, water inlet; 3, sealing rod; 4, fluid passage; 5, valve rod; 6, upper water outlet; 7, lower water outlet; 8, sealing ring; 9, fixed seat; 10, spring; 11, limit pin. Specific embodiments

[0017] To make the objectives, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Apparently, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0018] The technical solutions of the utility model will be described in detail below with specific embodiments. These specific embodiments can be combined or replaced according to the actual situation. The same or similar concepts or processes may not be repeated in some embodiments. Embodiment

[0019] Such as Figures 1 to 3As shown in the figure, the utility model provides a structure with a redundancy design for a downhole water nozzle, which includes a base 1, an upper water nozzle assembly, a lower water nozzle assembly, a water inlet 2, and a sealing rod 3. The upper water nozzle assembly and the lower water nozzle assembly are relatively installed on the base 1, and the structure of the lower water nozzle assembly is the same as that of the upper water nozzle assembly. The base 1 is provided with a fluid channel 4, and the fluid channel 4 is arranged between the upper water nozzle assembly and the lower water nozzle assembly. The lower water nozzle assembly is provided with a valve rod 5, and the valve rod 5 and the sealing rod 3 are fixedly connected and drive the sealing rod 3 to slide up and down. The upper water nozzle assembly and the lower water nozzle assembly are respectively provided with an upper water outlet 6 and a lower water outlet 7, and the water inlet 2 is communicated with the fluid channel 4.

[0020] Specifically, the sealing rod 3 is divided into a large-diameter section 31 and a small-diameter section 32, and the large-diameter section 31 and the small-diameter section 32 are transitioned by a chamfer. The diameter of the large-diameter section 31 is the same as the diameter of the small-diameter section of the fluid channel 4.

[0021] Specifically, a sealing ring 8 is sleeved on the large-diameter section 31.

[0022] Specifically, the lower water nozzle assembly is connected with a one-way limiting mechanism, and the one-way limiting mechanism includes a fixed seat 9, a spring 10, and a limiting pin 11. The fixed seat 9 is fixedly installed on the base 1, the spring 10 is respectively connected with the fixed seat 9 and the limiting pin 11, the limiting pin 11 is provided with a chamfer, and a corresponding chamfer is opened at the end of the valve rod 5.

[0023] In this embodiment, the lower water nozzle assembly is used as a backup. Under normal conditions, the upper water nozzle assembly is in a working state. The motor of the upper water nozzle assembly drives its transmission shaft to rotate, so that the valve rod of the upper water nozzle assembly moves upward and enters the adjustment stroke. The upper water outlet 6 gradually opens, and water flows from the water inlet 2 through the fluid channel 4 to the upper water outlet 6 and enters the formation. When the upper water nozzle assembly is working, the valve rod 5 of the lower water nozzle assembly is always in the closed position and does not participate in the water volume adjustment process.

[0024] If the upper water nozzle assembly is damaged and fails to work, the lower water nozzle assembly is switched to work. The motor of the lower water nozzle assembly drives its transmission shaft to rotate, so that the valve rod 5 and the sealing rod 3 start to move downward. When passing through the one-way limiting mechanism, the valve rod 5 will squeeze the limiting pin 11 during the downward movement, causing the limiting pin 11 to compress the spring 10 until it passes over the limiting pin 11. After passing over, the elastic force of the spring 10 causes the limiting pin 11 to reset. When the valve rod 5 moves upward later, it cannot pass over the limiting pin 11. At this time, the water inlet channels of both water nozzle assemblies are in the closed state. After adopting the one-way limiting mechanism, the up and down movement distance of the valve rod 5 after passing over is the same as the movement distance of the valve rod of the upper water nozzle assembly. The valve rod 5 continues to move downward and enters the adjustment stroke. The lower water outlet 7 gradually opens, and water flows from the water inlet 2 through the fluid channel 4 to the lower water outlet 7 and enters the formation. After the lower water nozzle assembly takes over the injection channel, it can completely replace all functions of the upper water nozzle assembly. Embodiment

[0025] The upper water outlet 6 and the lower water outlet 7 serve as the upper water inlet and the lower water inlet respectively, and the water inlet 2 serves as the water outlet and is communicated with the fluid channel 4. By adjusting the water inlet and outlet channels and changing the water inlet and outlet modes, the structure is made more diverse.

[0026] In addition to the above preferred embodiments, the present utility model has other implementation manners. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection claimed by the present utility model.

Claims

1. A structure for the redundancy design of an underground water nozzle, characterized in that, It includes a base (1), an upper water nozzle assembly, a lower water nozzle assembly, a water inlet (2) and a sealing rod (3). The upper water nozzle assembly and the lower water nozzle assembly are relatively installed on the base (1). The structure of the lower water nozzle assembly is the same as that of the upper water nozzle assembly. The base (1) is provided with a fluid passage (4), and the fluid passage (4) is arranged between the upper water nozzle assembly and the lower water nozzle assembly. The lower water nozzle assembly is provided with a valve rod (5), and the valve rod (5) is fixedly connected to the sealing rod (3) and drives the sealing rod (3) to slide up and down. The upper water nozzle assembly and the lower water nozzle assembly are respectively provided with an upper water outlet (6) and a lower water outlet (7), and the water inlet (2) is communicated with the fluid passage (4).

2. The structure of the remaining allowance design of the downhole water nozzle according to claim 1, characterized in that, The sealing rod (3) is divided into a large-diameter section (31) and a small-diameter section (32), and the large-diameter section (31) and the small-diameter section (32) are transitioned through a chamfer. The diameter of the large-diameter section (31) is the same as the diameter of the small-diameter section of the fluid passage (4).

3. The structure of the remaining allowance design of the downhole water nozzle according to claim 2, characterized in that, A sealing ring (8) is sleeved on the large-diameter section (31).

4. The structure of the redundant design of the downhole water nozzle according to claim 1, characterized in that The lower water nozzle assembly is connected with a one-way limiting mechanism. The one-way limiting mechanism includes a fixed seat (9), a spring (10) and a limiting pin (11). The fixed seat (9) is fixedly installed on the base (1). The spring (10) is respectively connected to the fixed seat (9) and the limiting pin (11). The limiting pin (11) is provided with a chamfer, and a corresponding chamfer is opened at the end of the valve rod (5).

5. The structure of the redundancy design of the downhole water nozzle according to claim 1, characterized in that, The upper water outlet (6) and the lower water outlet (7) serve as an upper water inlet and a lower water inlet respectively, and the water inlet (2) serves as a water outlet and is communicated with the fluid passage (4).

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