一种注水封隔器反洗负压机构
By utilizing the hydrostatic pressure of the wellbore through the negative pressure chamber structure, the problem of unreliable well-washing channel closure by the water injection packer under high temperature and high pressure environment is solved, achieving reliable well-washing channel closure and reducing the cost of additional well workover operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUXIN CITY GASOLINEEUM TOOL FACTORY
- Filing Date
- 2025-11-11
- Publication Date
- 2026-07-17
AI Technical Summary
The existing water injection packer's well-washing mechanism is prone to jamming or unreliable closure under high temperature and high pressure environments, resulting in additional well-workover operations, increased operating costs, and impact on production.
The structure employs a negative pressure chamber and utilizes the hydrostatic pressure of the wellbore as a reset force source to ensure reliable closure of the well washing channel, avoiding reliance on springs or large pressure differentials.
It provides a closing force far exceeding that of a spring, ensuring reliable closure of the well-washing channel, reducing operating costs, and improving the reliability and applicability of the tool.
Smart Images
Figure CN224515158U_ABST
Abstract
Claims
1. A water injection packer backwashing negative pressure mechanism, characterized in that, The system includes an upper connector (1), a well-washing cylinder (2), a central tube (3), a well-washing piston (4), a rubber sleeve shaft (5), a balance piston (6), a sealing rubber sleeve (7), a lower pressure ring (8), a locking spring (9), a setting piston (10), and a lower connector (11). The central tube (3) extends axially, with its upper end connected to the upper connector (1) and its lower end connected to the lower connector (11). A pressure transmission hole is provided on the wall of the central tube (3). The well-washing cylinder (2) is coaxially sleeved outside the central tube (3), with its upper end connected to the upper connector (1). The rubber sleeve shaft (5) is coaxially sleeved on the outer side of the middle part of the central tube (3), and has a well-washing channel that runs vertically through it. The well-washing piston (4) is coaxially sleeved on the central tube (3). The well-washing piston (4) is located on the rubber sleeve shaft (5) and inside the well-washing cylinder (2). The well-washing piston (4) forms a closed negative pressure chamber with the well-washing cylinder (2), the central tube (3), and the rubber sleeve shaft (5). The well-washing piston (4) can slide axially and closes the upper port of the well-washing channel of the rubber sleeve shaft (5) when it is in the lower limit position. The balance piston (6) is located below the well-washing piston (4) and is connected to the lower end of the well-washing cylinder (2). The sealing rubber sleeve (7), the lower pressure ring (8), and the locking spring (9) are coaxially sleeved on the rubber sleeve shaft (5) and located below the well-washing piston (4). The setting piston (10) is sleeved outside the central tube (3) and located below the lower pressure ring (8).
2. The backwash negative pressure mechanism of the water injection packer according to claim 1, characterized in that, Sealing mechanisms are respectively provided between the well-washing piston (4) and the central tube (3) and between the well-washing piston (4) and the rubber sleeve shaft (5).
3. The backwash negative pressure mechanism of the water injection packer according to claim 1, characterized in that, The balance piston (6) is threadedly connected to the well-washing cylinder (2) and is positioned opposite to the lower end face of the well-washing piston (4).
4. The backwash negative pressure mechanism of the water injection packer according to claim 1, characterized in that, The locking spring (9) is an open ring structure, and its inner wall engages with the annular groove provided on the rubber sleeve shaft (5).
5. The backwash negative pressure mechanism of the water injection packer according to claim 1, characterized in that, The seat piston (10) and the lower pressure ring (8) are connected by threads.
6. The backwash negative pressure mechanism for a water-filled packer according to claim 1, characterized in that, The well-washing cylinder (2) has a well-washing hole on its side wall that communicates with the internal chamber.
7. The backwash negative pressure mechanism of the water injection packer according to claim 1, characterized in that, The sealing rubber tube (7) is located between the lower pressure ring (8) and the shoulder of the rubber tube shaft (5).
8. The backwash negative pressure mechanism of the water injection packer according to claim 1, characterized in that, The lower connector (11) has a flow channel inside that communicates with the central tube (3).