CN102828743B - Tracing quantum dot water injection cross-section logging method - Google Patents
Tracing quantum dot water injection cross-section logging method Download PDFInfo
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- CN102828743B CN102828743B CN201210341584.XA CN201210341584A CN102828743B CN 102828743 B CN102828743 B CN 102828743B CN 201210341584 A CN201210341584 A CN 201210341584A CN 102828743 B CN102828743 B CN 102828743B
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Abstract
The invention relates to a tracing quantum dot water injection cross-section logging method, and mainly aims at providing a novel water injection well cross-section logging method which is accurate in measurement. The method comprises following steps of preparing different spherical transparent quantum dot carriers with different sizes; placing the prepared carriers into a wellhead releasing device of a water injection well to be radiated by laser; releasing the spherical transparent quantum dot carriers, and facilitating the spherical transparent quantum dot carriers to form suspension liquid with liquid inside the water injection well; utilizing an optical imaging technology to detect the dynamic distribution of the spherical transparent quantum dot carriers in the well, and transmitting the detected dynamic distribution image back to a ground computer; and obtaining light density distribution of different frequencies according to the detected image so as to calculate a porosity and relative water injection quantity of the water injection cross section. By analyzing the detected light density distribution of different frequencies, the porosity and the relative water injection quantity of the water injection cross section can be obtained; and meanwhile, the dynamic situation of the water injection can be controlled according to the distribution of the quantum dot carriers with different sizes in the well so as to obtain the cross-section logging data.
Description
Technical field
The present invention relates to a kind of method be applied in water injection well profile logging.
Background technology
The logging method of current reaction water injection well water absorbing capacity is a lot, mainly contains flowmeter logging, temperature logging and radioisotope log.Wherein, flowmeter logging is convenient to quantitative calculating, and Explanation Accuracy is high, but the equipment needed is complicated, measures cost higher.Although temperature logging can not by the restriction of tubing string, be not also subject to the impact of the pollution of temperature, pressure and impurity geologic(al) factor, laminarity is poor, and quantitative interpretation is more difficult.Radioisotope log laminarity is good, but influence factor is more, and measurement result is inaccurate.
Summary of the invention
In order to solve the technical problem mentioned in background technology, the invention provides a kind of spike quantum dot injection profile logging method, application the method is by analyzing the light distribution of the different frequency measured, the degree of porosity of water injection profile and relative water injection rate can be obtained, simultaneously, according to the distribution of quantum dot vector in down-hole of different size, the current intelligence of water filling can be grasped, thus obtain abundant profile logging data.
Technical scheme of the present invention is: this kind of spike quantum dot injection profile logging method, comprises the steps:
the water-soluble quantum dot of the different colours prepared is adsorbed on porosity sorbing material, is prepared into the transparent quantum dot vector of ball-type of different size;
by step
in the transparent quantum dot vector of ball-type for preparing put into wellhead of water injection well release, lay multiple laser probe in release, before releasing, irradiate the transparent quantum dot vector of ball-type with laser;
open wellhead of water injection well release with the normal water filling of water injection well, discharge the transparent quantum dot vector of aforementioned ball-type, in described carrier and water injection well, liquid forms suspension;
utilize optical image technology to detect the DYNAMIC DISTRIBUTION of the transparent quantum dot vector of aforementioned ball-type in down-hole with the Camera being fixed on down-hole, and measured DYNAMIC DISTRIBUTION image is transmitted back in aboveground computer;
draw the light distribution of different frequency according to measured image, thus calculate the degree of porosity of water injection profile and relative water injection rate.
The present invention has following beneficial effect: this method is compared with traditional radio isotope injection profile logging method, owing to adopting the quantum dot of different colours as tracer, so be not vulnerable to the impact of extraneous factor while ensureing laminarity, measurement result is accurate.In addition, the only visible ray that quantum dot sends, in down-hole, distribution realizes visual spike carrier, can water filling under moment monitor well dynamic, identifiable design stratum with big pore passage, calculates relative water injection rate more accurately.This method is simple to operate, and the well-log information obtained is intuitively accurate.Meanwhile, spike carrier is radiationless, can guarantee the safety of staff.After application this method, by analyzing the light distribution of the different frequency measured, the degree of porosity of water injection profile and relative water injection rate can be obtained, simultaneously, according to the distribution of quantum dot vector in down-hole of different size, the current intelligence of water filling can be grasped, thus obtain abundant profile logging data.
Accompanying drawing illustrates:
Fig. 1 is when specifically implementing of the present invention, and on the wellhead of water injection well release be applied to, curved cover plate is in the structural representation after open mode.
Fig. 2 is when specifically implementing of the present invention, and on the wellhead of water injection well release be applied to, curved cover plate is in the structural representation after closed condition.
Fig. 3 is when specifically implementing of the present invention, the structure sectional view of double-deck Taper Pipe on the wellhead of water injection well release be applied to.
Fig. 4 is when specifically implementing of the present invention, be applied to the support bracket fastened structural representation of microcam.
Fig. 5 is the structural representation of closed-loop on microcam fixed support in Fig. 4.
Fig. 6 is the front view of closed-loop on microcam fixed support in Fig. 4.
Fig. 7 is application course of work schematic diagram of the present invention.
1-curved cover plate in figure, 2-hollow ball, 3-rotating shaft, 4-external screw thread, 5-lasing light emitter, 6-tail pipe, the double-deck Taper Pipe of 7-, 8-inner cone, 9-outer cone, 10-annular space chamber, 11-quantum dot material, 12-flashboard, 21-leader cable jack, 22-sealing ring, 23-cable in stock jack, 24-microcam, 25-protective cover, 26-window, 27-inner ring seal circle, 28-closed-loop, 29-circular arc barb, 30-wellhead of water injection well, 31-injection well tubing, 32-water injection well sleeve pipe, 33-packer, 34-oil pipe connects short circuit, 35-one way valve, 36-water filling layer, 37-Camera.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the invention will be further described:
First this programme is summarized: quantum dot (Quantum dots, QDs) also known as semiconductor nanocrystal (Semiconductor nanocrystal), be a kind of nano particle be made up of II-VI race (as CdSe, CdTe, CdS, ZnSe etc.) or III-V race (as InP, InAs etc.) element.In semiconductor-quantum-point, electronics has unique luminosity, and after irradiating quantum dot with laser, quantum dot light emitting can last for hours.Because quantum dot sends the visible ray of different colours, if therefore luminescent quantum dot is adsorbed on the ball-type carrier of different size by we, the ball-type carrier of such different size becomes spike carrier.When the normal water filling of water injection well, spike carrier injects into well along with water, and filter to be amassed in well on water filling layer the most at last.Downhole detector can be easy to the DYNAMIC DISTRIBUTION detecting mark different colours carrier.By analyzing the light distribution of different frequency measured, the well-log informations such as the degree of porosity of water injection profile and relative water injection rate can be estimated.According to the distribution of carrier in down-hole of different size, the current intelligence of water filling can be grasped, thus obtain abundant profile logging data.
On above basic scheme basis, we obtain following steps:
the water-soluble quantum dot of the different colours prepared is adsorbed on porosity sorbing material, is prepared into the transparent quantum dot vector of ball-type of different size.
Current most convenient, the most traditional prepare quantum point methods, be colloid chemistry methods, can produce in a large number, water-soluble or oil-soluble quantum dot can be prepared, the quantum dots such as common such as CdSe, CdTe, ZnSe.When completing this step, select the size of the small spherical particles of porous adsorptivity generally will conform to formation pore size range, and be greater than formation pore size.For middle less permeable layer, effective thickness is less, and particle diameter generally should select 100 ~ 300 μm.For middle and high infiltration permeable layers, effective thickness is comparatively large, and particle diameter generally should select 400 ~ 700 μm.Electronegative quantum dot solution is directly added and to have in the microsphere particle of adsorptivity electrically on the contrary with it.By electrostatic interaction, quantum dot, by adsorption microspheres particle surface, after stirring, dry, dewatering, makes the microballoon skeleton of numerous small holes.Transparent silica gel liquid mixes with it mutually, makes it evenly wrap up outside skeleton, guarantee that in carrier, quantum dot can not come off in the injecting process, and stable luminescent property, heat resistance is good.According to the ratio of the amount of silica gel and microsphere particle, the density of carrier can be determined.The order ground of the similar density of support density and water filling can be reached like this.
by step
in the transparent quantum dot vector of ball-type for preparing put into wellhead of water injection well release, lay multiple laser probe in release, before releasing, irradiate the transparent quantum dot vector of ball-type with laser.Its structure of wellhead of water injection well release applied in this step as shown in Figure 1 to Figure 3, this kind of release, comprise a hollow ball 2 with 1/4 breach, be hinged with a curved cover plate 1 being used for closed breach in the indentation, there of described hollow ball 2 by rotating shaft 3; On hollow ball 2, be positioned at the part below described breach, be uniformly distributed some lasing light emitters 5 irradiated to ball interior.
Have a double-deck Taper Pipe 7 be made up of transparent material at described hollow ball 2 internal fixtion, as shown in Figure 3, described double-deck Taper Pipe 7 is made up of inner cone 8, outer cone 9 and tail pipe 6; Wherein, described outer cone 9 is connected with tail pipe 6, is connected between inner cone 8 with outer cone 9 by some horizontal beams, forms an annular space chamber 10 between inner cone 8 and outer cone 9; The bottom of described tail pipe 6 is stretched out outside described hollow ball 2; The bottom of described tail pipe 6 has the external screw thread 4 for being connected with well head, and be fixed with one piece with the flashboard 12 of the axis perpendicular of described tail pipe 6; Have a locking slot matched with flashboard 12 at the inwall of described tail pipe 6, bottom and the flashboard 12 of described inner cone 8 touch.
During use, first open curved cover plate 1, poured in annular space chamber 10 by quantum dot material 11, now flashboard is in closed condition, and quantum dot material 11 can be accomplished to pave in annular space chamber 10 substantially.At this moment, close curved cover plate 1, start lasing light emitter and quantum dot material 11 is irradiated, until achieve the goal.Afterwards, tail pipe 6 is connected to well head, extract flashboard out, quantum dot material will fall into well, thus meets the needs implementing quantum dot logging method.
open wellhead of water injection well release with the normal water filling of water injection well, discharge the transparent quantum dot vector of aforementioned ball-type, in described carrier and water injection well, liquid forms suspension; Its flow process as shown in Figure 7.
utilize optical image technology to detect the DYNAMIC DISTRIBUTION of the transparent quantum dot vector of aforementioned ball-type in down-hole with the Camera being fixed on down-hole, and measured DYNAMIC DISTRIBUTION image is transmitted back in aboveground computer; The carrier of different size, the i.e. carrier of different colours and the certain density suspension of water mixing composition.
As shown in Figure 7, the Camera applied in this step is fixed on outside microcam fixed support being connected to oil pipe connection short circuit 34.Microcam fixing rack structure as shown in Figure 4, this kind is for the fixed support of the microcam in the logging method of spike quantum dot, comprise a female hollow cylinder of inner wall belt, described internal thread can with being threaded outside oil pipe, described hollow cylinder is stainless steel, a protective cover 25 in arc-shaped projection is fixedly connected with in the outer wall upper end of described hollow cylinder, described protective cover 25 has some windows 26, wherein, the material of protective cover 25 is stainless steel, and the material of window 6 is transparent glass fiber reinforced plastic; On the outer wall of hollow cylinder, the position of corresponding window 26 has microcam embedded groove.
As shown in Figure 5, described fixed support also comprises a closed-loop 28, the inside and outside circumference of described closed-loop 28 all has a locking limit of being with circular arc barb 29, the structure of described circular arc barb 29 as shown in Figure 6, circular arc is above convenient to closed-loop to push, and barb below then plays the effect of locking.The lower end of described protective cover 25 and the outer wall lower end of hollow cylinder do not touch, described the two have the draw-in groove matched with described circular arc barb 29, push described locking after the two to realize closed-loop 28.
In addition, for realizing the control of microcam and the extraction of vision signal, needing to be communicated by cable, therefore, described protective cover 25 being provided with the leader cable jack 1 be connected with inside micro video camera and cable in stock jack 23.
In addition, for making the stable connection of this kind of fixed mount and oil pipe, can be fixed with a sealing ring 22 on the top of described protective cover 25, described closed-loop 28 also fixes an inner ring seal circle 7.
During use, first microcam is arranged on the outer wall of hollow cylinder, afterwards the signal of microcam and control cables is connected on cable jack.After connecting, push closed-loop, can be connected with oil pipe to be gone into the well after determining locking, due on oil pipe to have held connecting thread successfully in precalculated position, therefore, when after assigned address, can arrange to go into the well after this kind of fixed support is directly screwed, thus meet the needs implementing quantum dot logging method.
During concrete enforcement, get the carrier of n kind color, and the vector contg of often kind of color being all m mutually, is the different size carrier Homogeneous phase mixing of M=m × n number.When the normal water filling of water injection well, the carrier of mixing with in water Injection Well, the volume of water filling is V, the concentration η=M/V of the suspension that such carrier and water are formed.Along with water injects into well, spike carrier flows to water filling layer with hydraulic pressure by perforation and filter to be amassed in well on water filling layer the most at last.The survey meter that the camera probe higher by resolution ratio can be formed is placed near perforation layer, and positive correlation aperture layer of popping one's head in, instrument is connected with aboveground computer.Due to the only visible ray that each carrier sends, such camera probe may detect current intelligence and the distribution situation of carrier adsorption on water filling layer that carrier enters perforation layer, by probe imaging on a computer display.Thus easily can observe the DYNAMIC DISTRIBUTION that down-hole sends different colours carrier, and then grasp the current intelligence of water filling, realize down-hole visual.By monitoring carrier at down-hole current intelligence, be less than the carrier of pore size, flow into stratum with water inner; Be greater than the carrier of pore size, be adsorbed on water filling surface.By the color of light, the size of carrier can be determined, thus very simply and intuitively judge the distribution of water injection profile pore size, and whether there is stratum with big pore passage.
draw the light distribution of different frequency according to measured image, thus calculate the degree of porosity of water injection profile and relative water injection rate.The realization of this step depends on the water filling dynamic process recorded in abovementioned steps and can preserve on computers.By observing water filling dynamic process, identifiable design goes out to be greater than the spike carrier of a kind of color of all pore sizes of water injection profile.Measure the number that this colour carrier flows into perforation layer.This step, by repeatedly observing the video of preservation, or by slowing down screen playing progress rate, thus determines that this colour carrier enters the number of perforation layer, can draw the total carrier number injecting perforation layer, can calculate the water injection rate entered from perforation laminar flow like this.If there is multi-openings layer in well, by mobile detection instrument, detect the current intelligence of carrier in each perforation layer, and carrier is at the distribution of water injection profile and content, the samely calculates each perforation layer water injection rate.Thus simply and accurately can determine the relative water injection rate of each water injection profile.
Compared with traditional tracer isotope injection profile logging method, the only visible ray that quantum dot sends, in down-hole, distribution realizes visual spike carrier, can water filling under moment monitor well dynamic, identifiable design stratum with big pore passage, calculates relative water injection rate more accurately.Simple to operate, but the well-log information obtained is intuitively accurate.Spike carrier is radiationless, can guarantee the safety of staff.
Claims (1)
1. a spike quantum dot injection profile logging method, comprises the steps:
the water-soluble quantum dot of the different colours prepared is adsorbed on porosity sorbing material, is prepared into the transparent quantum dot vector of ball-type of different size;
by step
in the transparent quantum dot vector of ball-type for preparing put into wellhead of water injection well release, lay multiple laser probe in release, before releasing, irradiate the transparent quantum dot vector of ball-type with laser;
open wellhead of water injection well release with the normal water filling of water injection well, discharge the transparent quantum dot vector of aforementioned ball-type, in described carrier and water injection well, liquid forms suspension;
utilize optical image technology to detect the DYNAMIC DISTRIBUTION of the transparent quantum dot vector of aforementioned ball-type in down-hole with the microcam being fixed on down-hole, and measured DYNAMIC DISTRIBUTION image is transmitted back in aboveground computer;
draw the light distribution of different frequency according to measured image, thus calculate the degree of porosity of water injection profile and relative water injection rate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469481A (en) * | 2018-12-25 | 2019-03-15 | 北京大德广源石油技术服务有限公司 | Chemical combination tracer and its application method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107842358B (en) * | 2017-11-22 | 2020-11-06 | 中国石油天然气集团公司 | Method for extracting tracing logging information to form flow imaging graph |
| CN110952980A (en) * | 2019-11-22 | 2020-04-03 | 西南石油大学 | Quantum dot tracer feeding device and fracturing horizontal well output section method |
| CN117234091B (en) * | 2023-11-14 | 2024-01-23 | 四川省威沃敦石油科技股份有限公司 | Oil gas well test quantum dot delivery system |
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| US8068226B2 (en) * | 2008-01-16 | 2011-11-29 | Baker Hughes Incorporated | Methods and apparatus for estimating a downhole fluid property |
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Patent Citations (5)
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| CN101952455A (en) * | 2007-12-17 | 2011-01-19 | 卢克斯创新有限公司 | Compositions and methods for maintenance of fluid conducting and containment systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109469481A (en) * | 2018-12-25 | 2019-03-15 | 北京大德广源石油技术服务有限公司 | Chemical combination tracer and its application method |
| CN109469481B (en) * | 2018-12-25 | 2019-09-03 | 北京大德广源石油技术服务有限公司 | Chemical combination tracer and its application method |
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