CN212130481U - Liquid pressure measuring device based on distributed optical fiber - Google Patents
Liquid pressure measuring device based on distributed optical fiber Download PDFInfo
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- CN212130481U CN212130481U CN202020274435.6U CN202020274435U CN212130481U CN 212130481 U CN212130481 U CN 212130481U CN 202020274435 U CN202020274435 U CN 202020274435U CN 212130481 U CN212130481 U CN 212130481U
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- optical fiber
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- optical cable
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Abstract
The utility model discloses a liquid pressure measuring device based on distributed optical fiber, which comprises a transmission optical cable and a pressure sensing probe which are arranged between an oil pipe and a well wall, wherein the pressure sensing probe sequentially comprises 2 sensing optical fibers, an ointment pipe, a reinforcing steel bar and a PE outer sheath of the sensing optical cable from inside to outside; a steel pipe protective sleeve is arranged outside the pressure sensing probe, and a pressure transmission hole is formed in the steel pipe protective sleeve. Compared with the prior art, the utility model discloses the design of structure is more ingenious, has not only expanded distributed optical fiber sensing technology's application, provides a novel perfect reliable monitoring means more for the oil gas exploitation trade, lays the basis for the scientific development of oil gas exploitation industry. Meanwhile, the cost of personnel measurement and the risk coefficient of underground measurement are reduced.
Description
Technical Field
The utility model relates to a liquid pressure measuring device based on distributed optical fiber belongs to oil well monitoring facilities.
Background
With the application and popularization of new oil and gas exploitation technologies, the environment under an oil well is more and more complex and changeable, and meanwhile, the underground pressure is a key parameter index penetrating through the oil and gas exploitation technologies. Therefore, the monitoring and the measurement of the underground pressure have important significance, the underground pressure monitoring and the measurement method not only can be used as a data index to guide the scientific application and the improvement of a new technology and a new process, but also can monitor the occurrence and the development of harmful geological conditions and realize early warning so as to ensure the safe production of an oil well. However, the main difficulties that downhole pressure monitoring will face are: oil and gas places are flammable and explosive; the underground environment is severe, high temperature and high pressure and high corrosion; the underground structure is complex, and the stratum can better achieve the monitoring effect only by partitioning, partitioning and point-to-point measurement; the well body space is long and narrow, and a large-volume sensor cannot be installed.
The pressure parameter under the oil well can not only judge the storage and distribution of oil gas, the production process of the oil well and improve the recovery ratio, but also is an important basis for protecting the stratum structure, preventing the damage of an oil pipe in the production process, maintaining the long-term safety of the well body and ensuring the continuous production of the oil field.
The distributed optical fiber sensing technology not only has the characteristics of corrosion resistance, explosion resistance, interference resistance and the like which are unique to a common optical fiber sensor, but also can realize distributed measurement of dozens of kilometers, and is suitable for harsh working condition requirements of certain environments. The technology has been successfully applied to health monitoring of certain large structures and buildings in the aspects of temperature and deformation measurement.
However, due to the complex working environment of the sensor, if solid motion around the sensing optical cable, such as rock fall, may cause the optical fiber to form strain caused by non-liquid pressure, which not only affects the measurement result, but also is inconvenient to maintain. Therefore, how to use the characteristics of the distributed optical fiber sensing technology for high-efficiency application of the distributed optical fiber sensing technology in a liquid pressure measuring device and system has important significance for scientific development of the oil and gas mining industry.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: problem and not enough to exist among the prior art, the utility model provides a structural design is more reasonable, the good reliability, the high liquid pressure measurement device based on distributed optical fiber of measurement accuracy.
The technical scheme is as follows: the utility model provides a liquid pressure measuring device based on distributed optical fiber, includes transmission optical cable and the pressure sensing probe of laying between along oil pipe and the wall of a well, its characterized in that: the pressure sensing probes at different oil layers are sequentially connected in series, and the pressure sensing probes sequentially comprise 2 sensing optical fibers, an ointment pipe, a reinforcing steel bar and a sensing optical cable PE outer sheath from inside to outside; a steel pipe protective sleeve is arranged outside the pressure sensing probe, and a pressure transmission hole is formed in the steel pipe protective sleeve.
The utility model discloses the technical scheme who further injects does: the pressure sensing probe is positioned between the well wall and the oil pipe, and a transmission optical cable of the pressure sensing probe is transmitted to the optical fiber demodulator positioned outside the well head through a cavity between the well wall and the oil pipe; and a packer is arranged between the cavity between the well wall and the oil pipe and the oil layer.
Furthermore, the device also comprises a pressure sensor joint protection device arranged at the bottom of the cavity between the well wall and the oil pipe.
Further, the sensing optical fiber is connected with the transmission optical cable through a fusion splicing sleeve.
Furthermore, epoxy resin glue is filled in a protection cavity between the steel pipe protection sleeve and the PE outer sheath of the sensor optical cable.
Has the advantages that: compared with the prior art, the utility model discloses the design of structure is more ingenious, has not only expanded distributed optical fiber sensing technology's application, provides a novel perfect reliable monitoring means more for the oil gas exploitation trade, lays the basis for the scientific development of oil gas exploitation industry. Meanwhile, the cost of personnel measurement and the risk coefficient of underground measurement are reduced.
Drawings
Fig. 1 is a schematic diagram of a simulated structure of an oil well according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the measuring device of the present invention.
Fig. 3 is a schematic view of a partial structure of a pressure sensing probe according to an embodiment of the present invention.
Fig. 4 is a structural sectional view of the pressure sensing probe in the embodiment of the present invention.
Detailed Description
The invention will be further elucidated with reference to the drawings and the specific embodiments.
The rock and soil under the oil well generally presents a layered and partitioned structure from top to bottom, a simulation diagram of the structure is shown in figure 1, when a corresponding stratum is an oil reservoir, the pressure of the oil reservoir of the corresponding stratum can be directly reflected, and the pressure of the oil reservoir determines the difficulty degree of oil extraction and different extraction schemes.
The embodiment provides a distributed optical fiber-based liquid pressure measuring device, as shown in fig. 1-4, a distributed pressure sensing probe 6 is sequentially arranged in series between an oil pipe 4, a well wall 1 outside the oil pipe and different oil layers 3, and the pressure sensing probe 6 sequentially comprises 2 sensing optical fibers 16, an ointment pipe 11, a reinforcing steel bar 10 and a sensing optical cable PE outer sheath 9 from inside to outside; a steel pipe protective sleeve 13 is arranged outside the pressure sensing probe, and a pressure transmission hole 14 is formed in the steel pipe protective sleeve 13. The pressure sensing probe is positioned between the well wall and the oil pipe, and a transmission optical cable 5 of the pressure sensing probe is transmitted to a distributed optical fiber demodulator 8 positioned outside the well head through a cavity between the well wall and the oil pipe; and a packer 2 is arranged between the cavity between the well wall and the oil pipe and the oil layer.
Preferably, the structure of the embodiment further comprises a pressure sensor joint protection device 7 arranged at the bottom of the cavity between the well wall and the oil pipe.
Preferably, the sensing fiber 16 is connected to the core 12 of the transmission cable by a fusion splicing sleeve 15.
Preferably, the transmission optical cable 5 is a GYTA standard communication optical cable.
Preferably, the steel pipe protective sleeve is a 316L steel protective pipe.
Preferably, the reinforcing steel bar 10 extends into the cavity of the protection tube, roughening treatment is performed on the surface of the extending reinforcing steel bar, epoxy resin glue is poured into the protection tube after the two optical fibers are welded, accidental breakage in the measurement process is prevented, a certain protection effect is achieved, the pressure transmission hole in the protection tube ensures that the external pressure is transmitted to the sensing optical fiber, the sensing optical fiber needs to be in a completely loose state, and necessary calibration is performed before actual measurement, so that the measurement accuracy is ensured.
Preferably, in order to achieve accurate pressure measurement, the length of the sensing optical cable is 0.5m, and the value of the length is close to the highest spatial resolution of the distributed fiber demodulator, so that the initial brillouin center frequency of the sensing optical cable and the initial brillouin center frequency of the transmission optical cable need to be greatly different, the center frequency of the transmission optical cable used in this embodiment is 10.86GHz, and the center frequency of the sensing optical fiber is 10.63GHz, and when more sensor probes are required to be connected in series, zero loss of a fusion splice needs to be ensured as much as possible, so as to achieve a larger sensing distance and better signal strength. After the sensing probe is packaged, the sensing probe is arranged at a position to be measured according to use requirements, and the system can carry out unattended automatic measurement by matching with corresponding software.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides a liquid pressure measuring device based on distributed optical fiber, includes transmission optical cable and the pressure sensing probe of laying between along oil pipe and the wall of a well, its characterized in that: the pressure sensing probe comprises 2 sensing optical fibers, an ointment pipe, a reinforcing steel bar and a PE outer sheath of a sensing optical cable from inside to outside in sequence; a steel pipe protective sleeve is arranged outside the pressure sensing probe, and a pressure transmission hole is formed in the steel pipe protective sleeve.
2. The distributed optical fiber based hydraulic pressure measurement device of claim 1, wherein: the pressure sensing probe is positioned between the well wall and the oil pipe, and a transmission optical cable of the pressure sensing probe is transmitted to the optical fiber demodulator positioned outside the well head through a cavity between the well wall and the oil pipe; and a packer is arranged between the cavity between the well wall and the oil pipe and the oil layer.
3. The distributed optical fiber based hydraulic pressure measurement device of claim 2, wherein: the pressure sensor joint protection device is arranged at the bottom of the cavity between the well wall and the oil pipe.
4. The distributed optical fiber based hydraulic pressure measurement device of claim 3, wherein: the sensing optical fiber is connected with the transmission optical cable through a fusion splicing sleeve.
5. The distributed optical fiber based hydraulic pressure measurement device of claim 4, wherein: epoxy resin glue is filled in a protection cavity between the steel pipe protection sleeve and the PE outer sheath of the sensor optical cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020274435.6U CN212130481U (en) | 2020-03-09 | 2020-03-09 | Liquid pressure measuring device based on distributed optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020274435.6U CN212130481U (en) | 2020-03-09 | 2020-03-09 | Liquid pressure measuring device based on distributed optical fiber |
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| Publication Number | Publication Date |
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| CN212130481U true CN212130481U (en) | 2020-12-11 |
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| CN202020274435.6U Active CN212130481U (en) | 2020-03-09 | 2020-03-09 | Liquid pressure measuring device based on distributed optical fiber |
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| CN (1) | CN212130481U (en) |
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2020
- 2020-03-09 CN CN202020274435.6U patent/CN212130481U/en active Active
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