CN102121378B - Optical fiber sensor for measuring underground pressure - Google Patents
Optical fiber sensor for measuring underground pressure Download PDFInfo
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- CN102121378B CN102121378B CN 201110053582 CN201110053582A CN102121378B CN 102121378 B CN102121378 B CN 102121378B CN 201110053582 CN201110053582 CN 201110053582 CN 201110053582 A CN201110053582 A CN 201110053582A CN 102121378 B CN102121378 B CN 102121378B
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Abstract
The invention relates to an optical fiber sensor for measuring underground pressure. The optical fiber sensor for measuring the underground pressure is characterized by comprising a metal protection pipe; one end of the metal protection pipe is a fixed end provided with a pressure inlet, and the other end of the metal protection pipe is a sealing end provide with an optical fiber lead-out hole; an outer-layer metal pipe is arranged in the metal protection pipe, an inner-layer metal pipe passes through the outer-layer metal pipe, one end of each of the two metal pipes is connected with the fixed end, and the inner cavity of the inner-layer metal pipe is communicated with the pressure inlet; the other end of the outer-layer metal pipe is provided with a tail fiber fixing seat; the tail fiber fixing seat is provided with a tail fiber; the other end of the inner-layer metal pipe is provided with a pressure cavity end plug; a signal transmission optical fiber is inserted and fixed into the pressure cavity end plug on the same horizontal line of the tail fiber; a fabry-perot cavity is formed between the end part of the signal transmission optical fiber and the end part of the tail fiber; an optical cable outer armor is sleeved on the periphery of the other end of the signal transmission optical fiber; and the signal transmission optical fiber provided with the optical cable outer armor passes through the optical fiber lead-out hole, is sealed and fastened by a sealing fastening device and the optical fiber lead-out hole and then is connected with demodulation equipment.
Description
Technical field
The present invention relates to a kind of sensor, particularly about a kind of in the Oil/gas Well production logging, be placed on for a long time the down-hole, be used for the Fibre Optical Sensor of measuring well downforce.
Background technology
Smart well is exactly that sensor, the data transmission system that can obtain down-hole oil gas production information unify control appliance and the well that can carry out on ground Data Collection and decision analysis have been installed in well.Can carry out Long-distance Control by smart well, reach the purpose of optimizing production capacity.Use smart well technology and can carry out Long-distance Control, the cross flow one of avoiding different reservoir pressures to bring to inflow and the outflow of a plurality of reservoir fluids by a bite well.Adopt for heavy wool is laminated, the application of intelligent well completion allows alternately to exploit the upper and lower payzone, has accelerated the speed of production of whole well, has also improved the net present value (NPV) of oil well.The telemanagement of oil reservoir has reduced the cost of potential workover treatment so that the operating personnel need not well is carried out physical interventions.Under the condition of rig time (especially in deep water or seabed) cost costliness, the reduction of workover cost can bring significant benefit, has also remedied the output of losing owing to well workover simultaneously.In addition, the Injection Well of using intelligent well completion can carry out water filling control better, improves the ultimate recovery of oil well.Simultaneously, using the smart well system also can reduce the surface based construction and execute cost.The purpose of smart well technology is to improve the oil mining rate, improves oil field automation control level, reduces oilfield operations cost and equipment cost, thereby realizes long-range economic benefit.
For the pressure measxurement under the Oil/gas Well, need to be able to realize the pressure measxurement that 100Mpa is above, and the raising along with the oil and gas exploitation technology, the degree of depth of oil-gas mining constantly increases, temperature, pressure under the Oil/gas Well constantly increases, the pressure-temperature sensor of electronic type can't adapt to present mining environment, the work drifting problem under hot environment occurred, can't long-term work and technical barrier that can't duplex measurement.Fibre Optical Sensor is good with high temperature resistant, anti-electromagnetic interference, long-time stability, use the advantages such as safety is not struck sparks, volume is little extensively to be approved; during but Fibre Optical Sensor is worked under this mal-condition in down-hole; often can be owing to vibrate, the effect of the factors such as corrosive fluid is corroded or destroys.Such mal-condition can cause the precise decreasing of sensor itself to make even sensor failure.Contact with liquid in the environment so need to prevent sensor, avoid fluid to be measured to corrosion or the destruction of the kernel approach handkerchief cavity segment of sensor.Need in addition to prevent that the friction that produces between each member in the sensor construction itself from returning the impact that stagnates to what sensor brought, cause the deviation between data that sensor is surveyed and the real data.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide a kind of simple in structurely, can adapt to the down-hole mal-condition, survey data is accurate, is used for the Fibre Optical Sensor of measuring well downforce.
For achieving the above object, the present invention takes following technical scheme: a kind of Fibre Optical Sensor of measuring well downforce, it is characterized in that: it comprises a protection metal pipe, one end of described protection metal pipe is fixed end, be provided with a pressure entrance on it, the other end of described protection metal pipe is sealed end, is provided with an optical fiber fairlead on it; Be provided with an outer layer metal tube in the described protection metal pipe, be equipped with an inner layer metal pipe in the described outer layer metal tube, described outer layer metal tube is connected an end and is all connected described fixed end with the inner layer metal pipe, and the inner chamber of described inner layer metal pipe is communicated with described pressure entrance; The other end of described outer layer metal tube is provided with the tail optical fiber holder, wears on the described tail optical fiber holder and is fixed with a tail optical fiber; It is stifled that the other end of described inner layer metal pipe is provided with pressure cavity end, described pressure cavity end blocks, wear in the position of same level line with described tail optical fiber and be fixed with a signal transmission fiber, have certain distance between the end of described signal transmission fiber and the end of described tail optical fiber, form a method handkerchief chamber; The other end periphery of described signal transmission fiber is arranged with the outer armour of optical cable, and the signal transmission fiber with the outer armour of described optical cable passes described optical fiber fairlead, and after fastening by sealing fastening device and the sealing of described optical fiber fairlead, the connection demodulated equipment.
Described optical fiber fairlead is tapered, described sealing fastening device comprises and is arranged in the described optical fiber fairlead, is set in cutting ferrule before the outer circumferential taper of the outer armour of described optical cable, the cone tip seal of described front cutting ferrule is pressed on the annular space between described optical fiber fairlead cone tip and the outer armour of described optical cable, cutting ferrule after the other end of described front cutting ferrule connects, it is circumferential outward that described rear cutting ferrule other end adapter sleeve is located at the outer armour of described optical cable, and screw thread compresses the hold-down bolt that is connected in described optical fiber fairlead the other end.
Distance range between the end of described signal transmission fiber and the end of described tail optical fiber is 100～200nm.
Described protection metal pipe, fixed end, inner layer metal pipe, pressure cavity end are stifled, outer layer metal tube, tail optical fiber holder and sealing fastening device adopt a kind of material in stainless steel material and the high nickel-base alloy-steel to make.
The measuring method of the Fibre Optical Sensor of above-mentioned a kind of measuring well downforce, it may further comprise the steps: gas or liquid enter the pressure cavity of inner layer metal pipe from pressure entrance, make inner layer metal Guan Yin be subject to the pressure-acting of fluid or gas, the corresponding change occurs in length, and then the method handkerchief chamber that forms between signal transmission fiber and the tail optical fiber is changed, pressure increases, the chamber length in method handkerchief chamber will increase thereupon, otherwise, pressure reduces, the chamber in method handkerchief chamber is long also can be reduced thereupon, formed a proportional relation between the chamber long value in method handkerchief chamber and the pressure at pressure entrance place, after demarcation is finished, by this chamber long value, just can extrapolate current force value, measure with this completed well downforce.
The present invention is owing to take above technical scheme; it has the following advantages: 1, the present invention is owing to be provided with protection metal pipe; be provided with inner layer metal pipe and the outer layer metal tube of coaxial line in the protection metal pipe; the fiber fixed frame that forms sensor; therefore, be beneficial to method handkerchief chamber and control chamber, method handkerchief chamber long value are set between two sections optical fiber, sensor has excellent sealing performance in addition; greatly stop hydrogen loss, prolonged the application life of sensor.2, it is stifled that the present invention is provided with pressure cavity end in the end of inner layer metal pipe, pressure cavity end blocks and is fixedly installed signal transmission fiber, when fluid or gas enter in the inner layer metal pipe from pressure entrance, can intercept continuing to flow into of gas or liquid, make the inner layer metal pipe be subject to the pressure-acting of fluid or gas, and can pass through signal transmission fiber transmission pressure value.3, the present invention since the outside of signal transmission fiber is arranged with one deck optical cable outside armour, therefore, draw connection during demodulated equipment when signal transmission fiber from protection metal pipe, can be used for optical fiber is carried out the protection of mechanical strength aspect.4, the present invention is owing to the sealed end at protection metal pipe is provided with the optical fiber fairlead; optical fiber passes the optical fiber fairlead; and armour outside optical fiber is outside equipped with optical cable; the outer armour of optical cable circumferentially is arranged with front cutting ferrule, rear cutting ferrule and hold-down bolt outward, the outer armour sealing of optical cable can be fastened on the optical fiber fairlead by front cutting ferrule, rear cutting ferrule and hold-down bolt.Structure of the present invention arranges simply, can not produce friction between each member, and can Protection Code handkerchief cavity segment is not corroded or destroy, and can adapt to abominable conditions down-hole, and survey data is accurate, therefore, can be widely used under the Oil/gas Well in the measuring process.
Description of drawings
Fig. 1 is sensor section schematic diagram of the present invention
Fig. 2 is sealing fastening device enlarged diagram of the present invention
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1; the present invention includes a protection metal pipe 1, an end of protection metal pipe 1 is fixed end 2, is provided with the pressure entrance 3 of a connection protection metal pipe 1 inside on the fixed end 2; the other end of protection metal pipe 1 is sealed end, is provided with the optical fiber fairlead 4 of a taper on it.Be provided with an inner layer metal pipe 5 in the protection metal pipe 1, an end of inner layer metal pipe 5 is connected and fixed end 2, and the other end is provided with pressure cavity end and blocks up 6, and the inner chamber of inner layer metal pipe 5 is communicated with pressure entrance 3 and forms a pressure cavity 7.The outer outer layer metal tube 8 that circumferentially is arranged with of inner layer metal pipe 5, an end of outer layer metal tube 8 are connected and fixed end 2, and are provided with tail optical fiber holder 9 at this end, wear on the tail optical fiber holder 9 and are fixed with a tail optical fiber 10.Wear on the pressure cavity end of inner layer metal pipe 5 ends stifled 6 and be fixed with a signal transmission fiber 11, signal transmission fiber 11 and tail optical fiber 10 are in the same horizontal line, and has certain distance between the end of the end of signal transmission fiber 11 and tail optical fiber 10, get 100～200nm among the present invention (only as example, but be not limited to this), form a method handkerchief chamber 12.The optical fiber fairlead 4 that the other end of signal transmission fiber 11 passes protection metal pipe 1 sealed end connects demodulated equipment.Be positioned at the outer outer armour 13 of optical cable that circumferentially is arranged with of the signal transmission fiber 11 of optical fiber fairlead 4 and protection metal pipe 1 outside, the outer armour 13 of optical cable is fastened on the optical fiber fairlead 4 of protection metal pipe 1 by the sealing fastening device sealing.
As shown in Figure 2, sealing fastening device comprises and is arranged in the optical fiber fairlead 4, is set in the outer armour 13 outer circumferential front cutting ferrules 14 of optical cable, the one end sealing of front cutting ferrule 14 is pressed on the annular space between optical fiber fairlead 4 and the outer armour 13 of optical cable, cutting ferrule 15 after the other end connects, rear cutting ferrule 15 other end adapter sleeves are located at optical cable, and armour 13 is outer circumferential outward, and screw thread compresses the hold-down bolt 16 that is connected in optical fiber fairlead 4 ends.Seal when fastening; compress the rear cutting ferrule 15 of double-screw bolt 16 extruding; cutting ferrule 14 before rear cutting ferrule 15 extruding; because optical cable fairlead 4 places of protection metal tube 1 are cone structure; when being compressed double-screw bolt 16 extruding; the material at front cutting ferrule 14 cone mouth tips will be filled up in the external diameter and the slit between optical cable fairlead 4 internal diameters of armour 13 outside optical cable, reach the purpose of metal sealing.
Pressure measurement method of the present invention is: when the pressure of gas or liquid enters the pressure cavity 7 of inner layer metal pipe 5 from pressure entrance 3, pressure cavity end stifled 6 can effectively intercept continuing to flow into of gas or liquid, make inner layer metal pipe 5 be subject to the pressure-acting of fluid or gas, because signal transmission fiber 11 is fixed on the pressure cavity end stifled 6, pressure cavity end stifled 6 is fixed on the inner layer metal pipe 5, tail optical fiber 10 is fixed on the outer layer metal tube 8 by tail optical fiber holder 9, form a method handkerchief chamber 12 between signal transmission fiber 11 and the tail optical fiber 10, therefore, when the pressure that enters pressure entrance 3 changes, corresponding change will occur in the length of inner layer metal pipe 5, this method handkerchief chamber 12 that has also just caused forming between signal transmission fiber 11 and the tail optical fiber 10 changes, pressure increases, the chamber length in method handkerchief chamber 12 will increase thereupon, otherwise, pressure reduces, the chamber in method handkerchief chamber 12 is long also can be reduced thereupon, just formed like this relation of a direct ratio between the pressure at the chamber long value in method handkerchief chamber 12 and pressure entrance 3 places, after demarcation is finished, by this chamber long value, just can extrapolate current force value, reach the purpose of pressure measurement of the present invention with this.
In above-described embodiment; protection metal pipe 1, fixed end 2, inner layer metal pipe 5, pressure cavity end are stifled 6, outer layer metal tube 8, tail optical fiber holder 9 and sealing fastening device all the resistant materials such as preferred stainless steel material, high nickel-base alloy-steel make, but be not limited to this different materials.
The various embodiments described above only are used for explanation the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents and improvement of carrying out on the basis of technical solution of the present invention all should do not got rid of outside protection scope of the present invention.
Claims (6)
1. the Fibre Optical Sensor of a measuring well downforce, it is characterized in that: it comprises a protection metal pipe, and an end of described protection metal pipe is fixed end, is provided with a pressure entrance on it, the other end of described protection metal pipe is sealed end, is provided with an optical fiber fairlead on it; Be provided with an outer layer metal tube in the described protection metal pipe, be equipped with an inner layer metal pipe in the described outer layer metal tube, described outer layer metal tube is connected an end and is all connected described fixed end with the inner layer metal pipe, and the inner chamber of described inner layer metal pipe is communicated with described pressure entrance; The other end of described outer layer metal tube is provided with the tail optical fiber holder, wears on the described tail optical fiber holder and is fixed with a tail optical fiber; It is stifled that the other end of described inner layer metal pipe is provided with pressure cavity end, described pressure cavity end blocks, wear in the position of same level line with described tail optical fiber and be fixed with a signal transmission fiber, have certain distance between the end of described signal transmission fiber and the end of described tail optical fiber, form a method handkerchief chamber; The other end periphery of described signal transmission fiber is arranged with the outer armour of optical cable, and the signal transmission fiber with the outer armour of described optical cable passes described optical fiber fairlead, and after fastening by sealing fastening device and the sealing of described optical fiber fairlead, the connection demodulated equipment.
2. the Fibre Optical Sensor of a kind of measuring well downforce as claimed in claim 1, it is characterized in that: described optical fiber fairlead is tapered, described sealing fastening device comprises and being arranged in the described optical fiber fairlead, be set in the front cutting ferrule of the outer circumferential taper of the outer armour of described optical cable, the cone tip seal of described front cutting ferrule is pressed on the annular space between described optical fiber fairlead cone tip and the outer armour of described optical cable, cutting ferrule after the other end of described front cutting ferrule connects, it is circumferential outward that described rear cutting ferrule other end adapter sleeve is located at the outer armour of described optical cable, and screw thread compresses the hold-down bolt that is connected in described optical fiber fairlead the other end.
3. the Fibre Optical Sensor of a kind of measuring well downforce as claimed in claim 1, it is characterized in that: the distance range between the end of described signal transmission fiber and the end of described tail optical fiber is 100～200nm.
4. the Fibre Optical Sensor of a kind of measuring well downforce as claimed in claim 2, it is characterized in that: the distance range between the end of described signal transmission fiber and the end of described tail optical fiber is 100～200nm.
5. as claimed in claim 1 or 2 or 3 or 4 a kind of Fibre Optical Sensor of measuring well downforce is characterized in that: described protection metal pipe, fixed end, inner layer metal pipe, pressure cavity end are stifled, outer layer metal tube, tail optical fiber holder and sealing fastening device adopt a kind of material in stainless steel material and the high nickel-base alloy-steel to make.
6. an employing is such as the measuring method of claim 1～5 Fibre Optical Sensor of measuring well downforce as described in each, it may further comprise the steps: gas or liquid enter the pressure cavity of inner layer metal pipe from pressure entrance, make inner layer metal Guan Yin be subject to the pressure-acting of fluid or gas, the corresponding change occurs in length, and then the method handkerchief chamber that forms between signal transmission fiber and the tail optical fiber is changed, pressure increases, the chamber length in method handkerchief chamber will increase thereupon, otherwise, pressure reduces, the chamber in method handkerchief chamber is long also can be reduced thereupon, formed a proportional relation between the chamber long value in method handkerchief chamber and the pressure at pressure entrance place, after demarcation is finished, by this chamber long value, just can extrapolate current force value, measure with this completed well downforce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110053582 CN102121378B (en) | 2011-03-07 | 2011-03-07 | Optical fiber sensor for measuring underground pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110053582 CN102121378B (en) | 2011-03-07 | 2011-03-07 | Optical fiber sensor for measuring underground pressure |
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| Publication Number | Publication Date |
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| CN102121378A CN102121378A (en) | 2011-07-13 |
| CN102121378B true CN102121378B (en) | 2013-04-24 |
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| CN 201110053582 Active CN102121378B (en) | 2011-03-07 | 2011-03-07 | Optical fiber sensor for measuring underground pressure |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103091013B (en) * | 2013-01-15 | 2015-04-22 | 南京师范大学 | Miniature SU-8 optical fiber fabry-perot pressure sensor and preparation method thereof |
| CN111980684B (en) * | 2019-05-05 | 2023-09-26 | 中国石油天然气股份有限公司 | Coiled tubing temperature and pressure monitoring optical cable and manufacturing method thereof |
Citations (7)
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|---|---|---|---|---|
| DE19808222A1 (en) * | 1998-02-27 | 1999-09-02 | Abb Research Ltd | Fiber Bragg grating pressure sensor with integrable fiber Bragg grating temperature sensor |
| CN1384341A (en) * | 2002-06-14 | 2002-12-11 | 清华大学 | Optical-fiber grating sensor detecting pressure temperature simultaneously |
| WO2004007910A1 (en) * | 2002-07-12 | 2004-01-22 | Sensor Highway Limited | Subsea and landing string distributed temperature sensor system |
| CN101324188A (en) * | 2008-07-28 | 2008-12-17 | 西安石油大学 | Inner pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor |
| GB2456300A (en) * | 2008-01-08 | 2009-07-15 | Schlumberger Holdings | Flexible riser having optical fibre sensor for predicting and managing conditions of pipe |
| CN201794579U (en) * | 2010-05-28 | 2011-04-13 | 北京康华盛鸿能源科技发展有限公司 | Packaging structure of quasi-distributed fiber grating temperature sensor |
| CN202001000U (en) * | 2011-03-07 | 2011-10-05 | 中国海洋石油总公司 | Optical fiber sensor for measuring downhole pressure |
-
2011
- 2011-03-07 CN CN 201110053582 patent/CN102121378B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19808222A1 (en) * | 1998-02-27 | 1999-09-02 | Abb Research Ltd | Fiber Bragg grating pressure sensor with integrable fiber Bragg grating temperature sensor |
| CN1384341A (en) * | 2002-06-14 | 2002-12-11 | 清华大学 | Optical-fiber grating sensor detecting pressure temperature simultaneously |
| WO2004007910A1 (en) * | 2002-07-12 | 2004-01-22 | Sensor Highway Limited | Subsea and landing string distributed temperature sensor system |
| GB2456300A (en) * | 2008-01-08 | 2009-07-15 | Schlumberger Holdings | Flexible riser having optical fibre sensor for predicting and managing conditions of pipe |
| CN101324188A (en) * | 2008-07-28 | 2008-12-17 | 西安石油大学 | Inner pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor |
| CN201794579U (en) * | 2010-05-28 | 2011-04-13 | 北京康华盛鸿能源科技发展有限公司 | Packaging structure of quasi-distributed fiber grating temperature sensor |
| CN202001000U (en) * | 2011-03-07 | 2011-10-05 | 中国海洋石油总公司 | Optical fiber sensor for measuring downhole pressure |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee after: China National Offshore Oil Corporation Patentee after: CNOOC Research Institute Patentee after: Beijing Weilanshi Technology Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee before: China National Offshore Oil Corporation Patentee before: CNOOC Research Center Patentee before: Beijing Weilanshi Technology Co., Ltd. |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: Beijing Weilanshi Technology Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: Beijing Weilanshi Technology Co., Ltd. |
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Effective date of registration: 20210806 Address after: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Patentee after: CNOOC RESEARCH INSTITUTE Co.,Ltd. Address before: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. Patentee before: CNOOC RESEARCH INSTITUTE Co.,Ltd. Patentee before: BEIJING RAYLENS TECHNOLOGY Co.,Ltd. |
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