CN219435101U

CN219435101U - Permanent well logging optical cable fixer

Info

Publication number: CN219435101U
Application number: CN202320447345.6U
Authority: CN
Inventors: 高峰; 顾洪代; 李国臣; 于强; 杨树峰
Original assignee: Vision Tianjin Energy Technology Co ltd
Current assignee: Vision Tianjin Energy Technology Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-07-28
Anticipated expiration: 2033-03-10

Abstract

The utility model provides a permanent well logging optical cable fixer, which comprises a wellhead tool string and an underground tool string, wherein the wellhead tool string is connected to the top end of a continuous oil pipe, and the underground tool string is connected to the tail end of the continuous oil pipe; the wellhead tool string includes: the device comprises a hanger, an optical cable sealing locking device, a wellhead slip type connector and a U-shaped slip; the downhole tool string comprises: a downhole slip type connector, an optical cable holder and a valve assembly; the wellhead slip type connector is hollow, and a U-shaped slip fixed optical cable is arranged in the hollow cavity; the optical cable fixer is used for fixing the optical cable extending out of the interior of the continuous oil pipe. The application adopts wellhead tool string and downhole tool string, and the top and the tail end of the coiled tubing are respectively provided with the optical cable sealing locking device and the optical cable fixer to fix the logging optical fiber, so that the optical cable is better protected when being pressed and fixed, and the service life of the logging optical fiber which is permanently arranged underground is prolonged.

Description

Permanent well logging optical cable fixer

Technical Field

The utility model relates to the technical field of oilfield logging exploration, in particular to a permanent well logging optical cable fixer.

Background

The production process of the oil and gas well is monitored in real time by adopting the optical fiber, so that important information related to the production running state of the oil and gas well such as a production profile, shaft integrity, switching well dynamics and the like can be obtained, and the information is important for daily maintenance of the oil and gas well, prolongation of life cycle and optimization and adjustment of a exploitation scheme.

The mode of deployment of the optical fiber into the well is divided into a permanent type and a recyclable type. In the permanent mode, once deployed in place, the optical fiber becomes a part of the production string structure and runs through the whole life cycle of oil and gas production; the recyclable optical fiber is used for monitoring the operation process at a certain time or at a certain stage, deploying the optical fiber into a well before operation, and recycling the optical fiber after operation.

Because of the differences between the well type and the production mode of the oil and gas well, the design of the running method and the device of the perpetual optical fiber also presents complexity and diversity, and the downhole tool string is used independently in the common oil and gas well detection process, for example: the patent with the application number of 200320129567.6 and the name of the integrated downhole tool string is only suitable for once descending in a gas production well with a production string, can finish the operations of scraping wax, flushing sand and checking sealing once, and is not suitable for being placed in an oil-gas well for a long time.

The scheme provides a permanently arranged logging optical cable fixer for a gas production well without a production pipe column, and fills the blank of the domestic oil and gas field development industry in the field of permanently arranged optical fiber monitoring of the oil and gas well.

Disclosure of Invention

The object of the present utility model is to solve at least one of the technical drawbacks mentioned.

Therefore, an object of the present utility model is to provide a permanent logging optical cable fixer, which adopts a wellhead tool string and a downhole tool string, wherein the logging optical fiber is fixed at the top end and the tail end of a coiled tubing through an optical cable sealing locking device and an optical cable fixer respectively, and the logging optical fiber is better protected when the optical cable is pressed and fixed, so that the service life of the logging optical fiber permanently arranged underground is prolonged.

In order to achieve the above object, an embodiment of an aspect of the present utility model provides a permanent logging cable holder, including a wellhead tool string and a downhole tool string, wherein the wellhead tool string is connected to a top end of a coiled tubing, and the downhole tool string is connected to a tail end of the coiled tubing;

the wellhead tool string includes: the device comprises a hanger, an optical cable sealing locking device, a wellhead slip type connector and a U-shaped slip; the hanger is arranged in the wellhead four-way joint, the upper end is internally connected with an optical cable sealing locking device, the lower end is connected with a wellhead slip type connector, and the lower end of the wellhead slip type connector is connected with one end of a continuous oil pipe; the wellhead slip type connector is hollow, and a U-shaped slip is arranged in the hollow cavity; the U-shaped slips are used for fixing a first fixing point at the top of the optical cable; the optical cable sealing and locking device is used for fixing a second fixing point at the top of the optical cable;

the downhole tool string comprises: a downhole slip type connector, an optical cable holder and a valve assembly; the underground slip type connector is connected with the other end of the continuous oil pipe, one end of the optical cable fixer is connected with the underground slip type connector, the other end of the optical cable fixer is connected with the valve assembly, and the optical cable fixer is used for fixing the optical cable extending out of the interior of the continuous oil pipe.

Further preferably, the wellhead tool string further comprises a tubing string running tool connected to the bottom of the coiled tubing nipple at the lower end of the injector head.

Further preferably, the hanger is an integrally formed hollow structural member, the outer wall of the hanger is provided with a plurality of surface grooves, and a rubber sealing ring is sleeved at each surface groove.

Further preferably, the optical cable sealing and locking device and the optical cable fixer are internally provided with optical cable clamping assemblies, the optical cable clamping assemblies are spring locking umbrellas, and the spring locking umbrellas comprise hollow conical bases and umbrella-shaped locking mechanisms.

Further preferably, the umbrella-shaped locking mechanism is formed by integrally pressing an arched spring piece.

Further preferably, the optical cable holder further comprises an upper joint and a lower outer barrel; the upper connector is connected with the lower outer cylinder through threads; the middle part of the upper joint is provided with a supporting rod, an optical cable clamping assembly is arranged in a cavity in the supporting rod, the bottom end of the optical cable clamping assembly is abutted to a compression block, the other end of the compression block is fixed inside a driving sleeve, and the driving sleeve is fixed on a lower outer cylinder. .

Further preferably, the valve assembly comprises a check valve, a back pressure valve, a bypass rupture disc, and a domed plug; the check valve, the back pressure valve, the bypass rupture disc and the round head plug are connected in sequence;

the single flow valve is used for enabling fluid in the continuous oil pipe to realize downward unidirectional flow;

the back pressure valve is used for adjusting the pressure and flow required by the pipeline, and when the pressure is too high, the back pressure valve automatically lifts and discharges the too high pressure to play a role of cutting off or throttling;

the bypass rupture disc and the round head plug are connected in sequence and used for protecting a pipeline.

Further preferably, the U-shaped slips are formed by a pair of identical metal tiles, and U-shaped protrusions are arranged on the side wall of the groove in the middle of each tile; the U-shaped protrusion is used for pressing the optical cable.

According to the permanently-arranged logging optical cable fixer provided by the embodiment of the utility model, the wellhead tool string and the downhole tool string are adopted, the logging optical fiber is fixed at the top end and the tail end of the coiled tubing through the optical cable sealing locking device and the optical cable fixer respectively, and better protection is obtained when the optical cable is pressed and fixed, so that the service life of the logging optical fiber permanently arranged underground is prolonged

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a permanent well logging fiber optic cable holder according to the present utility model;

FIG. 2 is a schematic diagram of a wellhead tool string according to the present utility model;

FIG. 3 is a schematic diagram of a downhole tool string according to the present utility model;

FIG. 4 is a schematic view of the structure of the optical cable holder of the present utility model;

FIG. 5 is a schematic view of a hanger according to the present utility model;

FIG. 6 is a schematic view of the cable clamp assembly of the present utility model;

fig. 7 is a schematic structural diagram of a U-slip according to the present utility model.

In the figure: 1. a wellhead tool string; 2. a downhole tool string; 3. a coiled tubing; 4. a wellhead four-way joint; 101. a hanger; 102. an optical cable sealing and locking device; 103. a wellhead slip type connector; 104. u-shaped slips; 105. a rubber seal ring; 201. a downhole slip type connector; 202. an optical cable fixer; 203. a single flow valve; 204. a back pressure valve; 205. bypass rupture disc; 206. a round-head plug; 2021. an upper joint; 2022. a lower outer cylinder; 2023. a support rod; 2024. an optical cable clamping assembly; 2025. a compaction block; 2026. a drive sleeve; A. a first fixed point; B. a second fixed point; C. a hollow conical base; D. umbrella-shaped locking mechanism; 1041. u-shaped protrusions.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1, the embodiment of the utility model provides a permanent logging optical cable fixer 202, which comprises a wellhead tool string 1 and a downhole tool string 2, wherein the wellhead tool string 1 is connected to the top end of a coiled tubing 3, and the downhole tool string 2 is connected to the tail end of the coiled tubing 3;

as shown in fig. 2, the wellhead tool string 1 includes: a hanger 101, an optical cable sealing locking device 102, a wellhead slip type connector 103 and a U-shaped slip 104; the hanger 101 is arranged in the wellhead four-way joint 4, the upper end is internally connected with the optical cable sealing locking device 102, the lower end is connected with the wellhead slip type connector 103, and the lower end of the wellhead slip type connector 103 is connected with one end of the coiled tubing 3; the logging fiber is arranged inside the coiled tubing 3. The wellhead slip type connector 103 is hollow, and a U-shaped slip 104 is arranged in the hollow cavity; the U-shaped slips 104 are used for fixing a first fixing point A at the top of the optical cable; the optical cable sealing and locking device 102 is used for fixing a second fixed point B at the top of the optical cable; that is, the upper end of the logging fiber in the coiled tubing is fixed by the optical cable sealing and locking device 102, and the lower end is fixed by the U-shaped slips 104, thereby realizing the fixation of the logging fiber at the wellhead.

As shown in fig. 3, the downhole tool string 2 includes: a downhole slip connector 201, a fiber optic cable holder 202, and a valve assembly; the downhole slip type connector 201 is connected with the other end of the coiled tubing 3, one end of the optical cable fixer 202 is connected with the downhole slip type connector 201, the other end of the optical cable fixer 202 is connected with the valve assembly, and the optical cable fixer 202 is used for fixing an optical cable extending out of the interior of the coiled tubing 3.

The wellhead tool string 1 further comprises a pipe hanging and delivering tool, and the pipe hanging and delivering tool is connected to the bottom of a nipple of the continuous oil pipe 3 at the lower end of the injection head. The optical fiber continuous oil pipe combined body is not permanently resided at a wellhead along with the wellhead tool string, but is used as a running tool of the wellhead tool string when the optical fiber is deployed, so that the wellhead tool and the optical fiber continuous oil pipe combined body below the hanger are hoisted.

The optical fiber is placed in the coiled tubing, the optical fiber and the optical fiber are synchronously put into the well in the form of a composite body, after the optical cable coiled tubing composite body is hung into the well from a wellhead four-way position by utilizing a pipe hanging and conveying tool, the optical cable coiled tubing composite body is clamped at the wellhead four-way position by utilizing a hanger, the top of the optical fiber in the coiled tubing is fixed by utilizing an optical cable sealing locking device, the point B of the optical fiber is fixed by utilizing a U-shaped slip 104, and the coiled tubing is clamped by utilizing a wellhead slip connector 103, so that the upper end of the coiled tubing is kept fixed relative to a well wall to be measured.

Referring to fig. 5, the hanger 101 is an integrally formed hollow structural member, through which the coiled tubing and the optical fiber composite pass, and a plurality of surface grooves are formed on the outer wall of the hanger 101, and a rubber sealing ring 105 is sleeved at each surface groove. The hanger is a sealing element, so that excessive pressure is avoided, and the overflow of liquid in the continuous oil pipe is avoided.

The optical cable sealing locking device 102 and the optical cable fixer 202 are respectively provided with an optical cable clamping assembly 2024, wherein the optical cable clamping assembly 2024 is a spring locking umbrella, and the spring locking umbrella comprises a hollow conical base C and an umbrella-shaped locking mechanism D.

As shown in fig. 6, the umbrella-shaped locking mechanism D is an arcuate spring piece integrally pressed. The optical fiber is pressed by an umbrella-shaped locking mechanism D after penetrating out of the hollow conical base C, so that the optical fiber is fixed.

As shown in fig. 4, the cable holder 202 further includes an upper connector 2021 and a lower outer barrel 2022; the upper joint 2021 and the lower outer tube 2022 are connected by screw threads; the middle part of top connection 2021 is equipped with bracing piece 2023, set up optical cable chucking subassembly 2024 in bracing piece 2023 inside cavity, optical cable chucking subassembly 2024's bottom butt compact heap 2025, compact heap 2025 other end is fixed inside driving sleeve 2026, driving sleeve 2026 is fixed on lower urceolus 2022.

The optical cable fixer 202 is disposed at the end of the optical fiber, the optical fiber passes through the cavity inside the support rod 2023 of the upper connector, and when the upper connector is screwed with the lower outer cylinder 2022, the compression block 2025 compresses the optical cable clamping assembly 2024, so as to promote the internal optical fiber to be compressed, thereby realizing the fixation of the tail end of the optical fiber.

The valve assemblies of the present application all employ standard components in the art, including a check valve 203, a back pressure valve 204, a bypass rupture disc 205, and a domed plug 206; the check valve 203, the back pressure valve 204, the bypass rupture disc 205 and the round-head plug 206 are connected in sequence;

the single flow valve 203 is used for realizing downward unidirectional flow of the fluid in the coiled tubing 3;

the back pressure valve 204 is used for adjusting the pressure and flow rate required by the pipeline, and when the pressure is too high, the back pressure valve automatically lifts and discharges the too high pressure to play a role of cutting off or throttling;

the bypass rupture disc 205 is normally closed and is opened by the pressure of the wellhead pumped fluid when it is desired to open, thereby creating a fluid circulation path between the interior of the coiled tubing and the casing-coiled tubing annulus. Bypass rupture disc 205 is in turn connected to a bullnose 206, which bullnose 206 protects the bottom of the rupture disc for protecting the pipeline.

Referring to FIG. 7, the U-shaped slip 104 is formed of a pair of identical metal tiles with U-shaped protrusions on the side walls of the groove in the middle of each tile; the U-shaped protrusion is used for pressing the optical cable.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The permanently arranged logging optical cable fixer is characterized by comprising a wellhead tool string and a downhole tool string, wherein the wellhead tool string is connected to the top end of a continuous oil pipe, and the downhole tool string is connected to the tail end of the continuous oil pipe;

2. The permanent logging cable holder of claim 1 wherein the wellhead tool string further comprises a tubing string running tool connected to the bottom of the lower coiled tubing nipple of the injector head.

3. The permanent well logging optical cable fixer according to claim 1, wherein the hanger is an integrally formed hollow structural member, a plurality of surface grooves are formed in the outer wall of the hanger, and a rubber sealing ring is sleeved at each surface groove.

4. The permanent well logging optical cable fixer according to claim 1, wherein the optical cable sealing locking device and the optical cable fixer are internally provided with optical cable clamping assemblies, the optical cable clamping assemblies are spring locking umbrellas, and the spring locking umbrellas comprise hollow conical bases and umbrella-shaped locking mechanisms.

5. The permanent well logging fiber optic cable holder of claim 4 wherein said umbrella locking mechanism is integrally formed by compression molding of arcuate spring tabs.

6. The permanent well logging fiber optic cable holder of claim 1, wherein the fiber optic cable holder further comprises an upper fitting and a lower outer barrel; the upper connector is connected with the lower outer cylinder through threads; the middle part of the upper joint is provided with a supporting rod, an optical cable clamping assembly is arranged in a cavity in the supporting rod, the bottom end of the optical cable clamping assembly is abutted to a compression block, the other end of the compression block is fixed inside a driving sleeve, and the driving sleeve is fixed on a lower outer cylinder.

7. The permanent well logging cable holder of claim 1 wherein said valve assembly comprises a single flow valve, a back pressure valve, a bypass rupture disc, and a bullnose; the check valve, the back pressure valve, the bypass rupture disc and the round head plug are connected in sequence;

8. The permanent logging cable retainer of claim 1 wherein said U-slip is comprised of a pair of identical metal tiles with a U-shaped protrusion on the side wall of the groove intermediate each tile; the U-shaped protrusion is used for pressing the optical cable.