CN212614558U - Sealing device for coiled tubing logging - Google Patents

Abstract

The utility model relates to a sealing device for coiled tubing well logging, including sealing connection's coiled tubing joint, optical cable gland and instrument cluster subassembly in proper order, be provided with packing gland and return circuit seal box in the optical cable gland, the packing gland with return circuit seal box intercommunication just can dismantle the connection, and the optic fibre in the coiled tubing passes the packing gland holding in the return circuit seal box. The utility model discloses a sealing device for coiled tubing logging, through with coiled tubing joint, optical cable sealed tube and tool string subassembly sealing connection in proper order, and set up packing sealed tube and return circuit seal box in the optical cable sealed tube, the optical cable in the coiled tubing passes the packing sealed tube and welds into the optic fibre return circuit ring at the end, this optic fibre return circuit ring holding is in the return circuit seal box, thereby seal protection to optic fibre and optic fibre return circuit ring, avoid the damage to optic fibre among the well logging process, improve the accuracy nature of coiled tubing logging.

Description

Sealing device for coiled tubing logging

Technical Field

The utility model relates to a coiled tubing well logging technical field, in particular to a sealing device for coiled tubing well logging.

Background

The coiled tubing is made of low-carbon alloy steel, has good flexibility, can replace the conventional tubing to carry out a plurality of operations, such as oil and gas field well repairing, well drilling, well completion, well logging and the like, and plays an increasingly important role in oil and gas field exploration and development.

In the case that a horizontal well cannot be put into the well in a conventional steel wire downhole mode, a test tool needs to be brought into an oil-gas downhole for testing in a coiled tubing mode, an optical cable can be put into the well along with a tool string in the well logging process, a distributed optical fiber temperature sensor adopts dual-port data acquisition, optical fibers at the tail end of the optical cable need to be welded with a loop and need to be sealed at the same time, and the existing sealing device is used for single optical fiber and cannot be applied to sealing of an optical fiber loop ring in a dual-port mode. Therefore, the prior art has yet to be developed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the shortcoming that exists among the prior art, provide a sealing device for coiled tubing well logging, can seal protection to optic fibre and optic fibre return circuit ring, avoid the damage of well logging in-process to optic fibre.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a sealing device for coiled tubing well logging, including sealing connection's coiled tubing joint, optical cable gland and tool string subassembly in proper order, be provided with packing gland and return circuit seal box in the optical cable gland, the packing gland with return circuit seal box intercommunication just can dismantle the connection, and the optic fibre in the coiled tubing passes the packing gland holding in the return circuit seal box.

Further, the packing seal tube includes the body, the embedded hollow first sealing member that has of one end of body, the other pot head of body is located the outer wall of return circuit seal box, return circuit seal box in the body in-connection has hollow second sealing member, the other end of return circuit seal box is provided with gland nut and seals, be provided with the packing in the body, the packing passes first sealing member and warp the body butt in the terminal surface of second sealing member.

Furthermore, the inner wall of the tube body is annularly provided with a protruding part and forms a limiting hole, and the diameter of the limiting hole is slightly larger than that of the packing.

Further, the tool string assembly includes, but is not limited to, a check valve, a bypass line, and a pressure gauge.

Further, the outer diameter of the optical cable sealing tube is 50.8mm, the inner diameter of the optical cable sealing tube is 35mm, and the outer diameter of the loop sealing box is 24 mm.

Further, the coiled tubing joint is a slip connector.

The utility model discloses beneficial effect that technical scheme has:

the utility model discloses a sealing device for coiled tubing logging, through with coiled tubing joint, optical cable sealed tube and tool string subassembly sealing connection in proper order, and set up packing sealed tube and return circuit seal box in the optical cable sealed tube, the interior optic fibre of coiled tubing passes the packing sealed tube and becomes optic fibre return circuit ring at the end welding, this optic fibre return circuit ring holding is in the return circuit seal box, thereby seal protection to optic fibre and optic fibre return circuit ring, avoid the damage to optic fibre among the well logging process, improve the accuracy nature of coiled tubing logging.

Drawings

FIG. 1 is a schematic structural view of the sealing device for coiled tubing logging of the present invention;

FIG. 2 is a schematic view of the connection between the packing gland and the cable gland of the present invention;

description of reference numerals:

100-sealing device for coiled tubing logging, 10-coiled tubing joint, 20-optical cable gland, 21-packing gland, 211-body, 2111-boss, 212-first seal, 213-packing, 22-loop gland, 221-second seal, 222-gland nut, 30-tool string component, 31-check valve, 32-bypass pipe, 200-coiled tubing, 201-optical cable.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the specific embodiments described herein are only used for explaining the present invention, and are not used for limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "connected" may be a fixed connection or a removable connection, or may be integral therewith; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1 and 2, the present invention provides a sealing device 100 for coiled tubing 200 logging, including a coiled tubing joint 10, an optical cable sealing tube 20 and a tool string assembly 30 which are sequentially and hermetically connected, wherein a packing sealing tube 21 and a loop sealing box 22 are disposed in the optical cable sealing tube 20, the packing sealing tube 21 is communicated with and detachably connected to the loop sealing box 22, and an optical cable 201 in the coiled tubing 200 passes through the packing sealing tube 21 and is accommodated in the loop sealing box 22.

In the present embodiment, the packing tube 21 has good toughness and sealing effect, and has very little abrasion to the optical cable 201, thereby reducing the vibration of the optical fiber in the optical cable 201; because the distributed optical fiber temperature sensor adopts dual-port data acquisition, two multimode optical fibers in the optical cable 201 in the coiled tubing 200 need to be welded to form an optical fiber loop ring, and the optical fiber loop ring is placed in the loop sealing box 22 for sealing treatment, so that the damage of vibration generated in the well logging process to the optical fibers can be avoided, and the well logging accuracy of the coiled tubing 200 is improved.

As an embodiment, please refer to fig. 2 again, the packing seal tube 21 includes a tube body 211, a hollow first sealing element 212 is embedded in one end of the tube body 211, the other end of the tube body 211 is sleeved on the outer wall of the loop seal box 22, the loop seal box 22 is connected to a hollow second sealing element 221 in the tube body 211, a sealing nut 222 is arranged at the other end of the loop seal box 22 for sealing, a packing 213 is arranged in the tube body 21, and the packing 213 penetrates through the first sealing element 212 and abuts against the end surface of the second sealing element 221 through the tube body 211, so as to prevent the packing 213 from moving and improve stability. The structure formed by the first sealing element 212, the tube body 211, the second sealing element 221, the loop sealing box 22 and the sealing nut 222 forms multiple fixing and sealing of the optical cable 201 and the optical fiber loop ring, so that vibration, pollution, corrosion and the like of the optical cable 201 and the optical fiber loop ring are avoided, the logging accuracy of the coiled tubing 200 is improved, and the service life of the optical cable 201 is prolonged.

The first sealing element 212 and the second sealing element 221 are nuts, and are respectively in threaded connection with the pipe body 211 and the loop sealing box 22, so that screwing and sealing are facilitated. During installation, the optical cable 201 penetrates through the packing 213, and then optical fibers are welded at the tail end of the optical cable 201 to form an optical fiber loop; and (3) screwing the seal nut 222, placing the optical fiber loop ring in the loop seal box 22, connecting the packing gland 21 and the loop seal box 22, and screwing the first seal 212 to finish installation.

Preferably, the inner wall of the tube 211 is annularly provided with a protrusion 2111 and forms a limiting hole (not shown), the diameter of the limiting hole is slightly larger than that of the packing 213, and the packing 213 is accommodated in the limiting hole, so that large offset and vibration are avoided, and the stability is further improved.

In this embodiment, the tool string assembly 30 includes, but is not limited to, a check valve 31, a bypass line 32, and a pressure gauge. Wherein the check valve 31 is used for controlling the fluid flow, and the bypass pipe 32 is used for water feeding.

In one embodiment, the cable gland 20 has an outer diameter of 50.8mm and an inner diameter of 35mm, the loop gland 22 has an outer diameter of 24mm, the loop gland 22 is installed in the middle of the cable gland 20, and the outer diameter of the loop gland 22 is smaller than the inner diameter of the cable gland 20 to ensure that water can flow out since the coiled tubing 200 is about to flow past the loop gland 22 and out through the check valve 31 when the coiled tubing is balanced.

In this embodiment, the coiled tubing joint 10 is a slip connector for connecting the coiled tubing 200 to a downhole tool, has high connection strength, maintains a drift diameter consistent with that of the coiled tubing 200, and is suitable for high-strength work and high-displacement circulation work.

To sum up, the utility model discloses a sealing device 100 for coiled tubing 200 logs, through with coiled tubing joint 10, optical cable gland 20 and tool string subassembly 30 sealing connection in proper order, and set up packing gland 21 and return circuit seal box 22 in optical cable gland 20, optical cable 201 in the coiled tubing 200 passes packing gland 21 and welds into the optic fibre return circuit ring at the end, this optic fibre return circuit ring holding is in return circuit seal box 22, thereby optic fibre and optic fibre return circuit ring seal protection in the optical cable 201, avoid the damage to optic fibre among the logging process, improve the accuracy nature of coiled tubing 200 logs.

The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes or variations led out by the technical scheme of the utility model are still in the protection scope of the utility model.

Claims (6)

1. The utility model provides a sealing device for coiled tubing well logging which characterized in that, includes in proper order sealing connection's coiled tubing joint, optical cable sealed tube and tool string subassembly, be provided with packing sealed tube and return circuit seal box in the optical cable sealed tube, packing sealed tube with return circuit seal box intercommunication and can dismantle the connection, the intraductal optic fibre of coiled tubing passes packing sealed tube holding in the return circuit seal box.

2. The sealing device according to claim 1, wherein the packing gland includes a tube body, a first hollow sealing member is embedded in one end of the tube body, the other end of the tube body is sleeved on an outer wall of the loop gland, the loop gland is connected with a second hollow sealing member in the tube body, a sealing nut is arranged at the other end of the loop gland for sealing, a packing is arranged in the tube body, and the packing passes through the first sealing member and abuts against an end face of the second sealing member through the tube body.

3. The sealing device of claim 2, wherein the inner wall of the tube body is provided with a protrusion and forms a limiting hole, and the diameter of the limiting hole is slightly larger than that of the packing.

4. The seal arrangement of claim 1, wherein the tool string assembly includes, but is not limited to, a check valve, a bypass tube, and a pressure gauge.

5. The sealing device of claim 1, wherein the cable gland has an outer diameter of 50.8mm, an inner diameter of 35mm, and the loop seal box has an outer diameter of 24 mm.

6. The sealing device of claim 1, wherein the coiled tubing joint is a slip connector.

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