Underground optical fiber coupler device capable of bearing pressure

Abstract

The utility model discloses an underground optical fiber coupler device capable of bearing pressure, which comprises a cover plate, a base, a clamping groove ring, a baffle ring and clamping sleeve joints, the base is provided with a groove, the center of the groove is provided with a boss, the cover plate used for sealing the groove and the boss is installed on the groove in a sealing way, and the two sides of the base are respectively connected with the clamping sleeve joints. According to the underground optical fiber coupler device capable of bearing pressure, the groove and the sealed cover plate are arranged on the underground optical fiber coupler device capable of bearing pressure, so that an inner cavity can be effectively ensured to be completely isolated from the outside, the clamping sleeve, the optical fiber tube and the optical fiber are firmly limited, and meanwhile, the higher external pressure resistance requirement is ensured; in addition, due to the fact that the sealing ring is attached to the outer diameter of an oil pipe or a pressure gauge dragging cylinder, fixation can be firm, the arc-shaped appearance structure can meet the requirement for smooth descending into a well, and meanwhile the sealing ring can be well attached to the arc-shaped sealing face of the cover plate and the arc-shaped sealing face of the base so that the requirement for higher working pressure can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole operating tools in oil and gas fields, in particular to a downhole optical fiber connector device capable of bearing pressure. Background Art

[0002] With the development of well logging technology, new requirements have been placed on the richness of information collected by downhole instruments, the amount of data uploaded, and the speed of data transmission. Fiber optic logging technology uses coiled tubing to deliver optical fiber and corresponding logging instruments to the predetermined well depth. Downhole data is then transmitted to the surface via optical fiber using light pulses as a carrier.

[0003] Downhole fiber optic splice devices primarily provide waterproof, dustproof, and mechanical protection at the splice site of armored downhole optical cables. Existing downhole fiber optic splice devices often fail to position the fiber optic tube. While the ferrule is sealed and position-controlled by the ferrule connector, the end face of the fiber optic tube is unrestricted, allowing for free axial movement. When the fiber bundle is coiled in the pressure-bearing base of the downhole fiber optic splice device, the lack of an annular groove makes installation difficult and can even cause the fiber to pop out of the base and be damaged by compression. Utility Model Content

[0004] In view of the above-mentioned defects or shortcomings, the purpose of the present invention is to provide a pressure-bearing downhole optical fiber connector device.

[0005] In order to achieve the above objectives, the technical solution of the utility model is:

[0006] A pressure-bearing downhole optical fiber connector device includes a base with a groove, a boss at the center of the groove, a cover plate for sealing the groove and the boss, and ferrule joints connected to both sides of the base.

[0007] A base sealing surface is provided on the base, the groove is provided on the base sealing surface, the groove is a U-shaped groove structure, and the boss is a U-shaped boss.

[0008] A plurality of sealing grooves are formed on the edge of the groove, and a clamping ring and a sealing ring are sequentially installed in the sealing grooves.

[0009] The bottom surface of the sealing groove and the sealing surface of the base are kept at the same height in the normal direction.

[0010] The cover plate is provided with a plurality of countersunk holes, and the axis centers of the countersunk holes all point to the axis center of the outer circle of the cover plate; the base sealing surface is provided with threaded holes corresponding to the countersunk holes, and the axis centers of the threaded holes all point to the axis center of the base sealing surface; screws for fixing the cover plate and the base are installed in the countersunk holes and threaded holes.

[0011] The inner wall of the cover plate is provided with an arc boss engaged with the groove, and the bottom surface of the arc boss is concentric with the outer circle of the cover plate; the arc boss is provided with an inner cavity engaged with the boss, and the bottom surface of the inner cavity is arc-shaped.

[0012] The bottom surface of the clamping groove ring is in contact with the bottom surface of the groove, the side surface of the clamping groove ring is in contact with the side surface of the groove, and the top surface of the clamping groove ring is in contact with the U-shaped arc boss of the cover plate.

[0013] The two end surfaces of the base are provided with tapered threaded holes, fine countersunk holes and through holes, and the through holes are connected with the grooves.

[0014] A limiting step is provided at the junction of the through hole and the fine countersunk hole.

[0015] A retaining ring is installed in the threaded hole and is limited to the inner conical surface of the threaded hole; one threaded end of the ferrule joint is connected to the base, and the end face of the optical fiber tube is against the inner limiting step surface of the retaining ring, the nut of the ferrule joint is locked, and the ferrule tube is locked and sealed.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention provides a pressure-resistant downhole fiber optic connector. By providing a groove and a sealed cover plate on the pressure-resistant downhole fiber optic connector, the connector effectively isolates the inner cavity from the outside. This ensures that the ferrule, fiber optic tube, and optical fiber are securely positioned while maintaining high resistance to external pressure, ensuring smooth downhole testing operations. Furthermore, the connector conforms to the outer diameter of the oil pipe or pressure gauge tube, ensuring a secure fit. Its curved exterior design allows for smooth downhole operation. The curved sealing surfaces of the cover plate and base ensure a tight fit between the sealing ring and the connector to meet higher operating pressure requirements.

[0018] Furthermore, since the present invention adds a retaining ring to use the internal limiting step surface to limit the optical fiber tube, it can effectively prevent the optical fiber from bending and being damaged due to the axial movement of the optical fiber tube; by adding a slot ring with a slotted structure, it can effectively ensure that the optical fiber bundle can be neatly coiled in the slot of the slot ring, and will not pop out and cause greater difficulty in assembly or cause squeezing and damage to the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the explosion structure of the pressure-bearing downhole optical fiber splicer device of the utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the structure of the pressure-bearing downhole optical fiber connector device of the utility model;

[0021] Figure 3This is a schematic structural diagram of the cover plate of the pressure-bearing downhole optical fiber splicer device of the utility model;

[0022] Figure 4 This is a schematic diagram of the clamping ring groove structure of the pressure-bearing downhole optical fiber connector device of the utility model. Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the clamping ring groove structure of the pressure-bearing downhole optical fiber connector device of the utility model. Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the inner hole structure of the pressure-bearing downhole optical fiber connector device of the utility model;

[0025] Figure 7 The utility model is a schematic diagram of the retaining ring structure of the pressure-bearing downhole optical fiber connector device.

[0026] In the figure, 1 is the cover plate, 2 is the base, 3 is the retaining ring, 4 is the retaining ring groove, 5 is the screw, 6 is the first sealing ring, 7 is the second sealing ring, 8 is the ferrule joint, 101 is the outer circle of the cover plate, 102 is the countersunk hole, 103 is the annular sealing surface, 104 is the arc boss, 105 is the inner cavity, 201 is the conical surface, 202 is the fine countersunk hole, 203 is the base sealing surface, 204 is the threaded hole, 205 is the sealing groove, 206 is the groove, 207 is the boss, 208 is the tapered threaded hole, 209 is the through hole, 210 is the outer circle surface of the base, 301 is the outer limit step surface, 302 is the inner limit step surface, 401 is the rectangular slot, 402 is the outer ring of the retaining ring, 403 is the inner ring of the retaining ring. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0028] like Figure 1 、 2 As shown, an exploded view of the components of the pressure-bearing downhole optical fiber connector device provided by the utility model is shown, specifically: a pressure-bearing downhole optical fiber connector device, comprising: a base 2, a groove 206 is formed on the base 2, a boss 207 is provided at the center of the groove 206, a cover plate 1 for sealing the groove 206 and the boss 207 is sealedly mounted on the groove 206, and a ferrule connector 8 is connected to both sides of the base 2.

[0029] Specifically, the base 2 is an annular surface structure, which is divided into a base outer circular surface 210 and a base inner circular surface. The base outer circle and the base inner circle are concentric circles. A base sealing surface 203 is opened on the base outer circular surface 210, and the groove 206 is opened on the base sealing surface 203. The groove 206 is a U-shaped groove structure, and the boss 207 is a U-shaped boss; wherein, there are multiple sealing grooves 205 starting from the edge of the groove 206, and the sealing groove 205 is sequentially installed with a groove ring 4 and a sealing ring. Exemplarily, the sealing ring specifically includes a first sealing ring 6 and a second sealing ring 7; the bottom surface of the sealing groove 205 and the base sealing surface 203 are maintained at the same height in the normal direction.

[0030] Correspondingly, the cover plate 1 is provided with a plurality of countersunk holes 102, the inner circle of the cover plate 1 is an annular sealing surface 103, the annular sealing surface 103 cooperates with the base sealing surface 203, and the axis center of the countersunk holes 102 points to the axis center of the outer circle 101 of the cover plate; the base sealing surface 203 is provided with threaded holes 204 corresponding to the countersunk holes 102, and the axis center of the threaded holes 204 points to the axis center of the base sealing surface 203; screws 5 for fixing the cover plate 1 and the base 2 are installed in the countersunk holes 102 and the threaded holes 204, which can seal and fix the cover plate 1 and the base 2, isolate the cavity from the outside world, and increase the pressure bearing capacity.

[0031] For example, Figure 3 As shown, the inner wall of the cover plate 1 is provided with an arc boss 104 which is engaged with the groove 206, and the bottom surface of the arc boss 104 is concentric with the outer circle 101 of the cover plate; the arc boss 104 is provided with an inner cavity 105 which is engaged with the boss 207, and the bottom surface of the inner cavity 105 is arc-shaped and concentric with the outer circle 101 of the cover plate.

[0032] Preferably, if Figure 4 、 5 As shown, the slot ring 4 is divided into a slot ring inner ring 403, the slot ring inner ring 403 has a circle of rectangular slots 401, the bottom surface of which is in contact with the bottom surface of the groove 206, the side surface of the slot ring 4 is in contact with the side surface of the groove 206, and the top surface of the slot ring 4 is in contact with the waist-shaped arc boss 104 of the cover plate.

[0033] like Figure 6 、 7As shown, the two end surfaces of the base 2 are provided with tapered threaded holes 208, fine countersunk holes 202, and through holes 209. The through holes 209 are connected to the grooves 206. A limit step is formed at the junction of the through holes 209 and the fine countersunk holes 202. A retaining ring 3 is installed in the threaded hole 208. The outer limit step surface 301 of the retaining ring 3 is limited by the inner conical surface of the threaded hole 208. When the retaining ring 3 is placed on the conical surface of the threaded holes 208 at both ends of the base, the threaded end of the ferrule connector 8 is connected to the base 2, and the end face of the optical fiber tube abuts the limit step surface 302 in the inner hole of the retaining ring 3. The nut of the ferrule connector 8 is locked, and the ferrule is locked and sealed.

[0034] The use process of this utility model is:

[0035] Install the two sealing rings in the sealing groove 205 of the base, the retaining ring in the waist-shaped groove structure 206, and then replace the cover plate, ensuring that the outer diameter 101 of the cover plate is flush with the outer diameter 210 of the base. Screw 5 is inserted through the countersunk hole 102 on the outer diameter 101 of the cover plate and tightened into the threaded hole 204 on the annular base sealing surface 203 of the base 2. At this point, the inner cavity of the pressure-bearing downhole optical fiber connector device is completely isolated from the outside world, achieving a secure position for the ferrule, optical fiber tube, and optical fiber while ensuring high resistance to external pressure, ensuring smooth downhole testing operations. This utility model ensures that the optical fiber is neatly coiled within the retaining ring and isolated from external fluids and pressure. It also conforms to the outer diameter of the oil pipe or pressure gauge tube, ensuring a secure fixation. The curved appearance structure allows for smooth downhole operation. The curved sealing surfaces of the cover plate and base also allow the sealing ring to fit well to meet higher operating pressure requirements.

[0036] For those skilled in the art, it is obvious that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, any improvements and changes that may be made by those skilled in the art to certain parts of the present invention still reflect the principles of the present invention and still achieve the purpose of the present invention, and all fall within the scope of protection of the present invention.

Claims

1. A pressure-resistant downhole optical fiber connector device, characterized in that: include: A base (2) is provided with a groove (206), a boss (207) is provided at the center of the groove (206), a cover plate (1) for sealing the groove (206) and the boss (207) is sealedly mounted on the groove (206), and a ferrule joint (8) is connected to both sides of the base (2).

2. The pressure-resistant downhole optical fiber connector device according to claim 1, characterized in that: The base (2) is provided with a base sealing surface (203), the groove (206) is provided on the base sealing surface (203), the groove (206) is a U-shaped groove structure, and the boss (207) is a U-shaped boss.

3. The pressure-resistant downhole optical fiber connector device according to claim 2, characterized in that: A plurality of sealing grooves (205) are provided on the edge of the groove (206), and a clamping ring (4) and a sealing ring are sequentially installed in the sealing grooves (205).

4. The pressure-resistant downhole optical fiber connector device according to claim 3, characterized in that: The bottom surface of the sealing groove (205) and the base sealing surface (203) maintain the same height in the normal direction.

5. The pressure-resistant downhole optical fiber connector device according to claim 4, characterized in that: The cover plate (1) is provided with a plurality of countersunk holes (102), the axes of the countersunk holes (102) all pointing to the axis of the outer circle (101) of the cover plate; the base sealing surface (203) is provided with threaded holes (204) corresponding to the countersunk holes (102), the axes of the threaded holes (204) all pointing to the axis of the base sealing surface (203); screws (5) for fixing the cover plate (1) and the base (2) are installed in the countersunk holes (102) and the threaded holes (204).

6. The pressure-resistant downhole optical fiber connector device according to claim 5, characterized in that: The inner wall of the cover plate (1) is provided with an arc boss (104) engaged with the groove (206), and the bottom surface of the arc boss (104) is concentric with the outer circle (101) of the cover plate; the arc boss (104) is provided with an inner cavity (105) engaged with the boss (207), and the bottom surface of the inner cavity (105) is arc-shaped.

7. The pressure-resistant downhole optical fiber connector device according to claim 6, characterized in that: The bottom surface of the clamping groove ring (4) fits with the bottom surface of the groove (206), the side surface of the clamping groove ring (4) fits with the side surface of the groove (206), and the top surface of the clamping groove ring (4) fits with the U-shaped arc boss (104) of the cover plate.

8. The pressure-resistant downhole optical fiber connector device according to claim 1, characterized in that: The two end surfaces of the base (2) are provided with a tapered threaded hole (208), a fine countersunk hole (202), and a through hole (209), and the through hole (209) is connected to the groove (206).

9. The pressure-resistant downhole optical fiber connector device according to claim 8, characterized in that: A limiting step is provided at the junction between the through hole (209) and the fine countersunk hole (202).

10. The pressure-resistant downhole optical fiber connector device according to claim 8 or 9, characterized in that: A retaining ring (3) is installed in the tapered threaded hole (208) and is engaged with the inner conical surface of the threaded hole (208); one threaded end of the ferrule joint (8) is connected to the base (2), and the end face of the optical fiber tube abuts against the inner limit step surface (302) of the retaining ring (3), locking the nut of the ferrule joint (8), and the ferrule tube is locked and sealed.

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