Safety nipple for improving safety of oil field construction
By designing a safety short-circuit device for the protective casing and disconnector assembly, the problem of detonation accidents before the perforating gun enters the well is solved, thus improving the safety of oilfield operations.
Patent Information
- Application Number
- CN202520032002.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing safety subs are prone to causing the perforating gun to detonate before entering the well due to operator error or stray current at the well site during oilfield construction.
A safety short section device, comprising a protective shell, a connecting sleeve, an isolating switch assembly, and a pressure inlet, was designed to ensure that the electric detonator stranded wire is in a short-circuit state before entering the well, and to activate the isolating switch assembly by liquid column pressure after entering the well, thereby establishing a normal power supply and detonation circuit for the electric detonator.
This effectively avoids accidents caused by misoperation or stray current ignition of the perforating gun before it enters the well, thus improving the safety of oilfield construction.
Smart Images
Figure CN223497897U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oilfield construction safety technology, and in particular to a safety short section for increasing the safety of oilfield construction. Background Technology
[0002] Safety knots are safety devices used in oilfield construction in the oil and gas industry, primarily for safety protection during drilling and well operations. They are typically installed at the joints between well tubing strings (such as drill pipe, casing, or tubing) to reduce accidents and improve operational safety. In past oilfield perforation operations using cable perforation, numerous incidents of perforating guns detonating on the surface before entering the well have occurred. These frequent accidents were mostly caused by the detonator being connected to the surface system after the perforating gun was installed. Operator error or stray currents at the well site could then trigger the detonator, leading to a surface detonation. Therefore, from an inherent safety perspective, during cable perforation operations, it is essential to ensure that the detonator strand is always short-circuited before the perforating gun enters the well, thus ensuring the perforating gun remains in a safe state before entering the well. This underscores the significant importance of the safety knot.
[0003] The existing safety features designed to enhance oilfield construction safety are prone to causing accidents in actual use, such as operator error or stray currents at the well site leading to the perforating gun detonating before entering the well.
[0004] Therefore, it is necessary to invent a safety short section to increase the safety of oilfield construction and solve the above problems. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] The purpose of this invention is to provide a safety sub that increases the safety of oilfield construction, thereby solving the problem mentioned in the background art that existing safety subs are prone to detonation accidents before the perforating gun enters the well due to operator error or stray current in the well site.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, this utility model provides the following technical solution: a safety short section for increasing the safety of oilfield construction, comprising a protective shell, a connecting sleeve fitted at one end of the protective shell, a device body fitted inside the protective shell, a rear cover fitted at one end of the connecting sleeve, an isolating switch assembly installed inside the device body, a cap fitted at one end of the protective shell, a fixing sleeve fitted inside the cap, and two sets of pressure inlet holes opened on the surface of the protective shell.
[0009] As a further embodiment of this utility model, a limiting ring is fitted onto the surface of the connecting sleeve, and the limiting ring is engaged with one side of the protective shell. The limiting ring serves to support the protective shell.
[0010] As a further embodiment of this utility model, a connecting ring is sleeved on one end of the protective shell. The connecting ring is sleeved inside the cap, and the connecting ring serves to fix the protective shell to the surface.
[0011] As a further embodiment of this utility model, the isolating switch assembly is sleeved inside the fixed sleeve. The isolating switch assembly serves to establish a normal power supply and detonation circuit for the detonation of the electric detonator.
[0012] As a further embodiment of this utility model, the surface of the protective shell is provided with an anti-corrosion layer, the material of which is epoxy coating. The anti-corrosion layer increases the corrosion resistance of the protective shell 1.
[0013] As a further embodiment of this utility model, both the back cover and the cap are provided with fixing threads inside, which facilitates connection.
[0014] (III) Beneficial Effects
[0015] This utility model provides a safety section that increases the safety of oilfield construction, and has the following beneficial effects:
[0016] 1. This safety short section, designed to enhance oilfield construction safety, utilizes an isolating switch assembly and a pressure inlet. During operation, when there is no liquid column outside the device body, the isolating switch assembly is in a short-circuit state, ensuring the two strands of the electric detonator are short-circuited. After the perforating gun enters the well, the device reaches the wellbore fluid level, and the wellbore fluid enters the safety short section through the pressure inlet. Once the device reaches a certain depth, the isolating switch assembly activates under the pressure of the wellbore fluid column, establishing a normal power supply and detonation circuit for the electric detonator. This device, installed on the upper part of the electric detonator compartment in cable perforation operations, provides inherent safety before the perforating gun enters the well. Before the perforating gun enters the well, this device effectively ensures that the two strands of the electric detonator are short-circuited, thus preventing accidents caused by operator error or stray currents at the well site leading to detonation before well entry, thereby improving safety. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;
[0019] Figure 3 This is a schematic diagram of the disconnector switch assembly and the pressure inlet hole structure of this utility model;
[0020] Figure 4 This is a schematic diagram of the overall planar structure of this utility model.
[0021] In the diagram: 1. Protective housing; 2. Connecting sleeve; 3. Rear cover; 4. Disconnecting switch assembly; 5. Cap; 6. Fixing sleeve; 7. Pressure inlet; 8. Limiting ring; 9. Connecting ring; 10. Device body. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0023] Please see Figures 1 to 4 This utility model provides a technical solution: a safety section for increasing the safety of oilfield construction, including a protective shell 1, a connecting sleeve 2 sleeved at one end of the protective shell 1, a rear cover 3 sleeved at one end of the connecting sleeve 2, an isolating switch assembly 4 inside the protective shell 1, a cap 5 sleeved at one end of the protective shell 1, a fixing sleeve 6 sleeved inside the cap 5, and two sets of pressure inlet holes 7 on the surface of the protective shell 1; through the setting of the isolating switch assembly 4 and the pressure inlet holes 7, when there is no liquid column outside the device body 10 during use, the isolating switch assembly 4 is in a short-circuit state, realizing that the two strands of the electric detonator are in a short-circuit state. When the perforating gun enters the well, the... After the device enters the wellbore fluid level, the wellbore fluid enters the safety sub-section device through the pressure inlet 7. When the device is lowered to a certain depth, under the pressure of the wellbore fluid column, the isolating switch assembly 4 operates, establishing a normal power supply and detonation circuit for the electric detonator. This device is installed on the upper part of the electric detonator compartment in cable perforation operations, providing inherent safety before the perforating gun enters the well. When the perforating gun is not in the well, this device can effectively ensure that the electric detonator's connecting wire is in a short-circuit state, thus avoiding accidents caused by operator error or stray currents in the well site leading to the perforating gun detonating before entering the well, improving safety.
[0024] A limiting ring 8 is fitted onto the surface of the connecting sleeve 2. The limiting ring 8 is engaged with one side of the protective shell 1. The limiting ring 8 serves to support the protective shell 1.
[0025] A connecting ring 9 is fitted onto one end of the protective shell 1. The connecting ring 9 is fitted into the inside of the cap 5. The connecting ring 9 serves to fix the protective shell 1 to the surface.
[0026] The isolating switch assembly 4 is sleeved inside the fixed sleeve 6. The isolating switch assembly 4 serves to establish a normal power supply and detonation circuit for the detonation of the electric detonator.
[0027] The surface of the protective shell 1 is provided with an anti-corrosion layer, which is made of epoxy coating. The anti-corrosion layer increases the corrosion resistance of the protective shell 1.
[0028] Both the back cover 3 and the cap 5 have internal fixing threads, which facilitate connection.
[0029] In this invention, the working steps of the device are as follows:
[0030] First step: When there is no liquid column outside the device body 10 during use, the isolating switch assembly 4 is in a short circuit state, realizing that the two strands of the electric detonator are in a short circuit state. When the perforating gun enters the well, the device enters the wellbore liquid surface, and the wellbore liquid enters the safety short section device through the pressure inlet 7.
[0031] The second step: After the device is lowered to a certain depth, under the pressure of the wellbore fluid column, the isolating switch assembly 4 operates, establishing a normal power supply and detonation circuit for the electric detonator. This device is installed on the upper part of the electric detonator compartment in cable perforation operations, providing inherent safety before the perforating gun enters the well. When the perforating gun is not in the well, this device can effectively ensure that the electric detonator's connecting wire is in a short-circuit state. It should be noted that the equipment structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the device's power mechanism, power supply system, and control system is not fully described. However, those skilled in the art, understanding the principle of the above utility model, can clearly understand the specifics of its power mechanism, power supply system, and control system. The control method in the application document is automatic control through a controller, and the controller's control circuit can be implemented by those skilled in the art through simple programming.
[0032] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.
[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A safety short section for increasing safety during oilfield construction, comprising a protective outer shell (1), characterized in that: One end of the protective housing (1) is fitted with a connecting sleeve (2), the inside of the protective housing (1) is fitted with a device body (10), one end of the connecting sleeve (2) is fitted with a rear cover (3), the inside of the device body (10) is provided with an isolating switch assembly (4), one end of the protective housing (1) is fitted with a cap (5), the inside of the cap (5) is fitted with a fixing sleeve (6), and two sets of pressure inlet holes (7) are opened on the surface of the protective housing (1).
2. The safety sub for increasing oilfield construction safety according to claim 1, characterized in that: A limiting ring (8) is fitted onto the surface of the connecting sleeve (2), and the limiting ring (8) is engaged with one side of the protective shell (1).
3. The safety sub for increasing safety in oilfield construction according to claim 1, characterized in that: One end of the protective shell (1) is fitted with a connecting ring (9), which is fitted inside the cap (5).
4. The safety sub for increasing oilfield construction safety according to claim 1, characterized in that: The disconnector assembly (4) is fitted inside the fixed sleeve (6).
5. A safety sub for increasing safety in oilfield construction according to claim 1, characterized in that: The protective shell (1) has an anti-corrosion layer on its surface, and the anti-corrosion layer is made of epoxy coating.
6. A safety sub for increasing safety in oilfield construction according to claim 1, characterized in that: Both the rear cover (3) and the cap (5) have internal fixing threads.