CN105181172A - Oil and gas well distributed fiber temperature measuring device, and underground arrangement method - Google Patents
Oil and gas well distributed fiber temperature measuring device, and underground arrangement method Download PDFInfo
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- CN105181172A CN105181172A CN201510644538.0A CN201510644538A CN105181172A CN 105181172 A CN105181172 A CN 105181172A CN 201510644538 A CN201510644538 A CN 201510644538A CN 105181172 A CN105181172 A CN 105181172A
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Abstract
The invention relates to an oil and gas well distributed fiber temperature measuring device, and an underground arrangement method, belonging to the oil gas exploitation field. The temperature measuring device comprises a temperature-sensitive device, a laser pulser, and a central processor; the temperature-sensitive device is provided with an optical coupler which is in connection with a scaling fiber; the scaling fiber is in connection with a temperature-sensitive fiber; the central processor comprises a filter which is in connection with a photoelectric converter; the photoelectric converter and a digit signal processing module are in connection; the digit signal processing module comprises a digital analog converter and a signal fitting device. The invention also provides the underground arrangement method of the oil and gas well distributed fiber temperature measuring device. The fiber temperature measuring device has the characteristics of simple structure, accurate temperature measurement, high precision, long service life, and sound anti-corrosion performance, and can adapt to extreme environments; the underground arrangement method has the characteristics of reasonable distribution, low cost, low installation difficulty and high data reliability.
Description
Technical field
The invention belongs to oil-gas mining field, relate to the temperature monitoring field in oilfield exploitation procedure, particularly a kind of Oil/gas Well distributed fiber temperature measuring device and down-hole method for arranging.
Background technology
Distributed optical fiber temperature measuring technology is widely used in the aspect such as temperature survey and monitoring of the temperature survey of hazardous location and monitoring, the temperature survey of important area and monitoring, Surface Pressure Vessel temperature survey and monitoring, the large-scale temperature survey of large area and monitoring and traffic and transport field.
In petroleum industry, Oil/gas Well distributed optical fiber temperature measurement technology can provide in real time, the temperature detection data of full well section, is applicable to determine hydrocarbon zone temperature, determines production fluid, aerogenesis position and detects the aspect work such as tubing string leakage.Meanwhile, Fibre Optical Sensor has electrical isolation, corrosion-resistant, the feature such as electromagnetism interference and essential safety, is therefore more suitable for using in oil-gas mining process.
According to the difference of optical fiber installation site, Oil/gas Well distributed optical fiber temperature measurement technology can survey three kinds of temperature profiles: 1) formation temperature: the prime stratum temperature of hydrocarbon-bearing pool, relevant to the underground temperature gradient of hydrocarbon-bearing pool and heat transfer physical property.
2) temperature is flowed into: reservoir fluid, in the temperature at (before flowing into pit shaft) sand face place, also can be called hydrocarbon-bearing pool sand surface temperature.The thermal effect such as viscous dissipation and thermal expansion is produced because pressure reduction makes fluid flow in porous medium, therefore, can be not identical with prime stratum temperature in the temperature of this point of fluid inflow.On the contrary, if do not have fluid to flow in stratum, so now the gas reservoir that measures of DTS flow into temperature just with gas reservoir formation temperature closely or equal.
3) temperature in wellbore: fluid flows into pit shaft, temperature mixed with wellbore fluids from inflow point.
The major way of China's present stage heavy crude reservoir exploitation is exploitation via steam injection.Exploitation via steam injection technology is the viscosity-temperature dependency utilizing viscous crude special, injects the steam of high-temperature in oil reservoir, reduces former oil viscosity, thus improves the fluid ability of crude oil, plays the effect of heavy crude producing and volume increase.In order to reasonable steam injection is recovered the oil in heavy crude heat extraction, be analyze note to adopt effect to the monitoring of downhole temperature index, allotment steam injection parameter, the important means of increasing economic efficiency.
Traditional down-hole temperature measurer can only to measure the temperature of certain location point sometime, point sensor can only move around by the continuous temperature change testing whole pit shaft, destroy thermal equilibrium in well like this, and the temperature survey realizing a lot of point only has a lot of point sensor of installation, increases installation difficulty and economic cost.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the invention provides a kind of Oil/gas Well distributed fiber temperature measuring device and down-hole method for arranging, optical fiber temperature-measurement apparatus structure is simple, and thermometric is accurate, precision is high, long service life, can adapt to extreme environment, and corrosion resistivity is good, the down-hole method for arranging distribution of Oil/gas Well distributed fiber temperature measuring device rationally, cost is low, and installation difficulty is low, and the data reliability obtained is high.
The technical solution adopted in the present invention is:
A kind of Oil/gas Well distributed fiber temperature measuring device, comprise temperature sensing device, laser pulse device, central processing unit, described temperature sensing device is provided with photo-coupler, described photo-coupler and calibration Fiber connection, described calibration optical fiber is connected with temperature sensing optical fiber, and described central processing unit comprises wave filter, and described wave filter is connected with photoelectric commutator, described photoelectric commutator is connected with digital signal processing module, and described digital signal processing module comprises digital to analog converter and signal fitting device.
A kind of Oil/gas Well distributed fiber temperature measuring device, described temperature sensing device is enclosed within alloy guard shield, and described temperature sensing device and alloy guard shield form a circular armored cable.
A kind of Oil/gas Well distributed fiber temperature measuring device down-hole method for arranging, comprises the following steps:
1) temperature sensing device is placed on the circular armored cable formed with alloy guard shield in alloy guard shield;
2) be rolled on beam tube by circular armored cable wrap, then surrounding is wound around upper waterproofing rope, and then lays polyurethane reinforcement in beam tube surrounding, and then entangles with plastic casing;
3) after being entangled by plastic casing, temperature sensing device is fixed on Oil/Gas Pipe outer wall by fixture, then with sleeve pipe, temperature sensing device and Oil/Gas Pipe is entangled.
Beneficial effect of the present invention is: optical fiber temperature-measurement apparatus structure is simple, thermometric is accurate, precision is high, long service life, can adapt to extreme environment, and corrosion resistivity is good, the down-hole method for arranging distribution of Oil/gas Well distributed fiber temperature measuring device rationally, cost is low, and installation difficulty is low, and the data reliability obtained is high.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of Oil/gas Well distributed fiber temperature measuring device of the present invention;
Fig. 2 is Oil/gas Well distributed fiber temperature measuring device down-hole of the present invention arrangement schematic diagram.
In figure, 1, temperature sensing device, 2, laser pulse device, 3, central processing unit, 4, photo-coupler, 5, calibration optical fiber, 6, temperature sensing optical fiber, 7, wave filter, 8, photoelectric commutator, 9, digital signal processing module, 10, digital to analog converter, 11, signal fitting device, 12, alloy guard shield, 13, circular armored cable, 14, beam tube, 15, waterproofing rope, 16, polyurethane reinforcement, 17, plastic casing, 18, fixture, 19, sleeve pipe.
Embodiment
Below in conjunction with accompanying drawing and concrete example; a kind of Oil/gas Well distributed fiber temperature measuring device described in the present patent application and down-hole method for arranging are described and are illustrated; object is in order to the public better understands technology contents of the present invention; instead of the restriction to described technology contents; under identical or approximate principle; to the improvement that described processing step carries out; comprise reaction conditions, agents useful for same improvement and replace; reach identical object, then all within the present patent application technical scheme required for protection.
As shown in Figure 1, 2, a kind of Oil/gas Well distributed fiber temperature measuring device, comprise temperature sensing device 1, laser pulse device 2, central processing unit 3, described temperature sensing device 1 is provided with photo-coupler 4, described photo-coupler 4 is connected with calibration optical fiber 5, described calibration optical fiber 5 is connected with temperature sensing optical fiber 6, described central processing unit 3 comprises wave filter 7, described wave filter 7 is connected with photoelectric commutator 8, described photoelectric commutator 8 is connected with digital signal processing module 9, and described digital signal processing module 9 comprises digital to analog converter 10 and signal fitting device 11.
A kind of Oil/gas Well distributed fiber temperature measuring device, described temperature sensing device 1 is enclosed within alloy guard shield 12, and described temperature sensing device 1 and alloy guard shield 12 form a circular armored cable.
A kind of Oil/gas Well distributed fiber temperature measuring device down-hole method for arranging, comprises the following steps:
1) temperature sensing device 1 is placed on the circular armored cable 13 formed with alloy guard shield 12 in alloy guard shield 12;
2) be wrapped on beam tube 14 by circular armored cable 13, then surrounding is wound around upper waterproofing rope 15, and then lays polyurethane reinforcement 16 in beam tube 14 surrounding, and then entangles with plastic casing 17;
3) after being entangled by plastic casing 17, temperature sensing device 1 is fixed on Oil/Gas Pipe outer wall by fixture 18, then with sleeve pipe 19, temperature sensing device 1 and Oil/Gas Pipe is entangled.
Distributed optical fiber temperature measurement technology is the thermometric new technology in heavy crude heat extraction down-hole, it utilizes Raman scattering and optical time domain reflection technology to develop, using the optical fiber reaching a few km under temperature sensor to down-hole, temperature profile change under the production wells of whole completion continuous lengths.Compared with traditional point sensor, there is unrivaled advantage.
Laser pulse enters from the one end optical fiber, with optical fiber interaction of molecules in forward direction, the scattering of various ways occurs.Wherein Raman scattering is because the thermal vibration of optical fiber molecule produces a light longer than optical source wavelength, claims Stokes (Stokes) light, and a light shorter than optical source wavelength is called anti-Stokes (Anti-Stokes) light.
In the present invention, Oil/gas Well distributed fiber temperature measuring device is made up of temperature sensing device 1, laser pulse device 2, central processing unit 3.Laser pulse device 2 produces high-power light pulse and enters the one section of calibration optical fiber being placed in calibration cell through photo-coupler, then enters temperature sensing optical fiber.After laser produces scattering in a fiber, the Raman back scattering with temperature information is optically coupled to the light that wave filter leaches different scattering wavelength.Two ways of optical signals, through opto-electronic conversion and amplification, is then carried out high-speed data process by data acquisition unit and is obtained temperature information.
Temperature calibration in distributed fiber Raman temp measuring system is mainly in order to revise stokes light and anti-Stokes light two path (comprising light path and circuit) in the inconsistency made and exist in operational process, after thermometric main frame is connected for dissimilar optical cable, gathering the temperature data of returning is the data that temperature-sensitive light signal obtains after certain data processing, the height of actual temperature could be reflected after must passing through fiber optic temperature matching, thus the temperature accuracy of the system of guarantee.
Because the diameter of optical fiber only has 0.1mm, and itself be a kind of hard brittle material, if optical fiber is directly deployed on oil pipe, very easily fracture in the process of going into the well.So temperature sensing device 1 to be placed on when down-hole is arranged the circular armored cable formed with alloy guard shield 12 in alloy guard shield 12; Be rolled in by circular armored cable wrap on oil-filled beam tube, then surrounding is wound around upper waterproofing rope, and then lays reinforcement in oil-filled beam tube surrounding, and then entangles with plastic casing; After being entangled by plastic casing, temperature sensing device 1 is fixed on Oil/Gas Pipe outer wall by fixture, then with sleeve pipe, temperature sensing device 1 and Oil/Gas Pipe is entangled.Arrange waterproofing rope, entering of anti-sealing causes local pressure excessive thus destroys optical fiber.This structure has following application characteristic, good mechanical property and environmental performance and higher tension and compressive strength.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but any change is done in its shape or structure; every have identical with the application or akin technical scheme, all drops within protection scope of the present invention.
Claims (3)
1. an Oil/gas Well distributed fiber temperature measuring device, it is characterized in that, comprise temperature sensing device (1), laser pulse device (2), central processing unit (3), described temperature sensing device (1) is provided with photo-coupler (4), described photo-coupler (4) is connected with calibration optical fiber (5), described calibration optical fiber (5) is connected with temperature sensing optical fiber (6), described central processing unit (3) comprises wave filter (7), described wave filter (7) is connected with photoelectric commutator (8), described photoelectric commutator (8) is connected with digital signal processing module (9), described digital signal processing module (9) comprises digital to analog converter (10) and signal fitting device (11).
2. a kind of Oil/gas Well distributed fiber temperature measuring device according to claim 1, it is characterized in that, described temperature sensing device (1) is enclosed within alloy guard shield (12), described temperature sensing device (1) and alloy guard shield (12) composition circular armored cable.
3. a kind of Oil/gas Well distributed fiber temperature measuring device down-hole according to claim 1 method for arranging, is characterized in that, comprise the following steps:
1) temperature sensing device (1) is placed on the circular armored cable formed with alloy guard shield (12) in alloy guard shield (12);
2) be rolled on beam tube by circular armored cable wrap, then surrounding is wound around upper waterproofing rope, and then lays polyurethane reinforcement in beam tube surrounding, and then entangles with plastic casing;
3) after being entangled by plastic casing, temperature sensing device (1) is fixed on Oil/Gas Pipe outer wall by fixture, then with sleeve pipe, temperature sensing device (1) and Oil/Gas Pipe is entangled.
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| US5618108A (en) * | 1992-06-16 | 1997-04-08 | Kabushiki Kaisha Toshiba | Temperature distribution measuring apparatus using an optical fiber |
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| CN102305965A (en) * | 2011-09-29 | 2012-01-04 | 武汉鑫光年光电技术有限公司 | Sensing optical cable for synchronously monitoring temperature and pressure in oil well tubing in distribution mode |
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| US5618108A (en) * | 1992-06-16 | 1997-04-08 | Kabushiki Kaisha Toshiba | Temperature distribution measuring apparatus using an optical fiber |
| CN2934569Y (en) * | 2006-02-24 | 2007-08-15 | 中国石油天然气集团公司 | Optical fiber test device suitable for permanent oil gas production well |
| CN201521291U (en) * | 2009-04-23 | 2010-07-07 | 大连理工大学 | Underground distributed temperature sensor |
| CN201402338Y (en) * | 2009-05-11 | 2010-02-10 | 江苏藤仓亨通光电有限公司 | Temperature measuring optical cable for oilfield |
| CN101787882A (en) * | 2010-02-11 | 2010-07-28 | 哈尔滨工业大学 | Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same |
| CN102305965A (en) * | 2011-09-29 | 2012-01-04 | 武汉鑫光年光电技术有限公司 | Sensing optical cable for synchronously monitoring temperature and pressure in oil well tubing in distribution mode |
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Application publication date: 20151223 |