A hollow water distributor core

Abstract

A kind of hollow water distributor core, there is inner throttle hole section on the upper part of lower threaded section of upper body, water outlet hole on the upper body is in the lower part of the inner throttle hole section, the lower part of throttle sleeve is screwed with the upper part of inner thread of lower body, the upper part of throttle sleeve has outer throttle section, the lower part of upper body is connected with the upper part of threaded connection of lower body, the outer throttle section extends into the inner throttle hole section, the diameter difference between the inner throttle hole section and the outer throttle section forms throttle section, the length of throttle section is determined by the number of threaded screwing of throttle sleeve and lower body, the processing difficulty can be reduced, the throttle degree and effect are determined by the length of throttle section and the diameter difference between the inner throttle hole section and the outer throttle section, the length of throttle section and the diameter difference between the inner throttle hole section and the outer throttle section are easy to control, therefore, the utility model discloses reliable structure, long service life, can make long-term, accurate separate layer injection well separate layer injection, with remarkable economic benefits.

Description

Technical Field

[0001] This utility model pertains to tools used for stratified water injection in oil fields, specifically a hollow water distributor core. Background Technology

[0002] When injecting water in layers, a water distributor is used to distribute water to each layer. Currently, there are hollow water distributors and eccentric water distributors, with hollow water distributors being the most widely used. The water distribution of a hollow water distributor is controlled by the throttling of the nozzles on the core. In existing hollow water distributors, the nozzles on the core are installed horizontally on the core (threaded connection). The outer diameter of the core must match the water distributor; its outer diameter cannot be large. Its inner diameter must pass through the testing instruments of the next-level water distributor, so its inner diameter cannot be small. Due to these limitations, the difference between the outer and inner diameters of the core is not large, meaning the core wall is not thick. Therefore, the nozzles are very thin, and the orifices on the nozzles are short. To achieve the required throttling effect, the orifice diameter must be reduced. After reducing the orifice diameter, on the one hand, the flow rate is very high, and the orifice is easily damaged, causing the orifice diameter to increase, resulting in an increased water distribution and causing the formation to be injected with more water than required. On the other hand, the small orifice diameter is easily blocked, reducing the water distribution and failing to meet the required water distribution. Another problem with existing water distributor cores is that the threaded connection between the core and the water tap is not secure, making them prone to falling off. This allows for unlimited water injection into the formation, resulting in the formation being injected with more water than required. For example, the Chinese patent for a water distributor core (patent number: 032505310) illustrates this issue.

[0003] Based on the aforementioned problems, technicians researched new water distributor cores to address these issues. For example, the Chinese patent application for a water distributor core (application number 201010258306.9) describes a vertically mounted water nozzle with a larger diameter. The nozzle can be lengthened, allowing for a larger nozzle orifice diameter while maintaining the same throttling effect. This overcomes the problems of small orifice diameter, thin wall thickness, and easy detachment. However, the inner holes of the positioning sleeve and lower body in the laboratory need to be machined as eccentric holes, with the axes of the upper and lower positioning holes not aligned with the axes of the positioning sleeve and lower body. This structure is relatively difficult to machine. Summary of the Invention

[0004] The purpose of this utility model is to design a hollow water distributor core to overcome the shortcomings of the existing technology, improve the throttling effect of the hollow water distributor, enable the stratified water injection well to inject water in a long-term and accurate manner, and reduce the difficulty of the addition process.

[0005] The purpose of this utility model is achieved as follows: It includes an upper body, a throttling sleeve, and a lower body. The lower part of the upper body has threads, and an inner throttling hole section is located above the threaded section of the lower part of the upper body. The upper body has a water outlet hole, which is located below the inner throttling hole section. The lower thread of the throttling sleeve is screwed into the upper inner thread of the lower body. The upper part of the throttling sleeve has an outer throttling section. The lower thread of the upper body is connected to the upper thread of the lower body. The outer throttling section extends into the inner throttling hole section. The diameter difference between the inner throttling hole section and the outer throttling section forms the throttling section. The length of the throttling section is determined by the number of turns of the threads of the throttling sleeve and the lower body. The inner and outer walls of the upper body, the throttling sleeve, and the lower body are coaxial.

[0006] The beneficial effects of this utility model are: the inner and outer walls of the upper body, throttling sleeve, and lower body are coaxial, without eccentric structure, which can reduce the difficulty of processing. The degree and effect of throttling are determined by the length of the throttling section and the diameter difference between the inner throttling orifice section and the outer throttling section. The length of the throttling section and the diameter difference between the inner throttling orifice section and the outer throttling section are easy to control. Therefore, this utility model has a reliable structure, long service life, and enables long-term and accurate stratified water injection in stratified water injection wells, resulting in significant economic benefits. Attached Figure Description

[0007] Appendix Figure 1 This is an assembly drawing of this utility model. Detailed Implementation

[0008] The following is in conjunction with the appendix Figure 1 The embodiments of this utility model will be described.

[0009] The embodiment of this utility model includes an upper body 1, a throttling sleeve 2, and a lower body 3. The lower part of the upper body 1 has threads, and an inner throttling orifice section 1-1 is located above the threaded section of the lower part of the upper body 1. The upper body 1 has a water outlet hole 1-2, which is located below the inner throttling orifice section 1-1. The lower thread of the throttling sleeve 2 engages with the upper inner thread of the lower body 3. The upper part of the throttling sleeve 2 has an outer throttling section 2-1. The lower thread of the upper body 1 engages with the upper thread of the lower body 3. The connection (the lower end face of the upper body 1 abuts against the shoulder face of the lower body 3, ensuring a constant overall length of this utility model) is established. The outer throttling section 2-1 extends into the inner throttling orifice section 1-1. The diameter difference between the inner throttling orifice section 1-1 and the outer throttling section 2-1 forms the throttling section 4. The length of the throttling section 4 is determined by the number of thread turns between the throttling sleeve 2 and the lower body 3. The inner and outer walls of the upper body 1, throttling sleeve 2, and lower body 3 are coaxial. The upper part of the upper body 1, the throttling sleeve 2, and the lower part of the lower body 3 have the same inner diameter, facilitating the passage of testing instruments.

[0010] Once the diameter difference between the inner throttling orifice section 1-1 and the outer throttling section 2-1 is determined, the throttling degree of this invention is determined by the length of the throttling section 4. The length of the throttling section 4 is determined by the number of thread turns between the throttling sleeve 2 and the lower body 3. Therefore, by controlling the length of the throttling section 4, this invention can achieve a throttling degree equivalent to that of a water nozzle with a certain diameter on the original water distributor core.

[0011] During water injection, the water is injected into the formation through the throttling section 4 and the outlet holes 1-2. When the injected water passes through the throttling section 4, the flow rate is controlled, and the formation is injected with the specified amount of water.

Claims

1. A hollow water distributor core, comprising an upper body (1), a throttling sleeve (2), and a lower body (3), characterized in that: The upper body (1) has a threaded lower part, and an inner throttling hole section (1-1) is above the threaded lower part of the upper body (1). The upper body (1) has a water outlet hole (1-2), which is located below the inner throttling hole section (1-1). The lower thread of the throttling sleeve (2) is screwed into the upper inner thread of the lower body (3). The upper part of the throttling sleeve (2) has an outer throttling section (2-1). The lower thread of the upper body (1) is connected to the upper thread of the lower body (3). The outer throttling section (2-1) extends into the inner throttling hole section (1-1). The diameter difference between the inner throttling hole section (1-1) and the outer throttling section (2-1) forms a throttling section (4). The length of the throttling section (4) is determined by the number of turns of the thread engagement between the throttling sleeve (2) and the lower body (3). The inner and outer walls of the upper body (1), the throttling sleeve (2), and the lower body (3) are coaxial.

2. The hollow water distributor core according to claim 1, characterized in that: The upper part of the upper body (1), the throttling sleeve (2), and the lower part of the lower body (3) have the same inner diameter.

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