CN107299833B - Bushing leak detection device and method - Google Patents
Bushing leak detection device and method Download PDFInfo
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- CN107299833B CN107299833B CN201710547648.4A CN201710547648A CN107299833B CN 107299833 B CN107299833 B CN 107299833B CN 201710547648 A CN201710547648 A CN 201710547648A CN 107299833 B CN107299833 B CN 107299833B
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Abstract
The invention discloses a device and a method for detecting a leak point of a casing, wherein a wellhead packer comprises a packer body, a sealing device is arranged in the packer body, a coiled tubing centralizer comprises an upper fixing ring and a lower fixing ring, the upper fixing ring and the lower fixing ring are connected through a spring component, a data measuring instrument comprises a first ultrasonic data measuring instrument and a second ultrasonic data measuring instrument, and the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are both arranged in a protection device. The device and the method for detecting the leakage point of the casing pipe have the advantages that the measuring speed is greatly improved by means of the continuity of the coiled tubing. The continuous oil pipe centralizer enables the data measuring instrument to be suitable for measuring of the variable-diameter casing pipe, and damage caused by contact of the ultrasonic data measuring instrument and the inner wall of the casing pipe is avoided. Meanwhile, the ultrasonic signal has abnormal sensitivity, the measurement is efficient and rapid, the data measuring instrument is widely applicable, and the reliability of the test principle is ensured, so that the operation of detecting the leakage point is simpler, more convenient and more effective.
Description
Technical Field
The invention relates to the technical field of casing pipe detection, in particular to a casing pipe leak detection device and a casing pipe leak detection method.
Background
The well integrity is the premise of ensuring the safe production of the oil-gas well, but the casing pipe leakage points are caused by a plurality of factors such as the casing pipe quality, the operation rules, the stratum stress, the mechanical force in the production increasing operation process and the like, and the normal production and development effects of the injection and production well pattern and the oil-water well are directly influenced. It is important to find the missing point quickly and accurately.
The main method for finding leakage of conventional casing in drilling site includes packer sectional blocking pressure test method. The packer leakage finding is that after the packer is put into a position suspected of having a leakage point in a shaft and is set, a wellhead is squeezed to test water and pressure, pressure change of a pressure testing well section is observed, and if the pressure drop exists, the leakage point exists underground. The method has the advantages of intuition and obvious effect. The disadvantages are as follows: the method is easily influenced by factors such as packer failure and shaft conditions, so that misjudgment of a leakage section is caused; secondly, the construction process is complicated and the operation intensity of constructors is high.
The method for finding leakage of domestic outer sleeves is researched and researched, and commonly used sleeve leakage finding well logging processes comprise isotope tracing well logging, flowmeter well logging, well temperature well logging, noise well logging, pulse neutron oxygen activation well logging, multi-arm well diameter well logging, electromagnetic flaw detection well logging and other technologies. Because of different measuring methods and used instrument outer diameters, each leakage finding method has different construction processes and is suitable for different pipe column tests, and the principle and the advantages and the disadvantages of each method are shown as follows;
(1) an isotope tracing well logging method comprises the following steps: the method uses a detector to continuously measure the trend of the tracer to determine the flow direction of the water. The process can not be adopted for judging the well sections which are not well cemented and the wells with lost surface casing.
(2) The flow meter well logging method comprises the following steps: the method is characterized in that continuous or fixed-point measurement is carried out from the top of a perforation section to a wellhead well section on the premise of constant water injection amount, the variation factors of the inner diameters of an instrument and a pipe column are eliminated, and the position with larger flow variation is a leakage point.
(3) The well temperature logging method comprises the following steps: and abnormity can occur on the well temperature curve, so that the lost well section of the injection well casing is judged. The leakage detection by the well temperature logging method can only determine the leakage point in a larger interval, and the position error of the leakage point is larger.
(4) The noise logging method comprises the following steps: due to noise generated by the flow of fluid in the well, the noise logging curve will have peaks of different frequencies at the production ports, leakage ports, channeling or necking of the fluid. When the noise is measured, the point selection needs to be carried out according to the abnormal part of the temperature or by referring to other reference data and by experience, so the method has certain limitation.
(5) The multi-arm caliper imaging logging method comprises the following steps: the multi-arm caliper imaging logging instrument is a contact measuring instrument, and can accurately find the expansion or reduction of the diameter of a casing through caliper logging, so as to find out the perforation point of the casing. Because included angles exist among the measuring arms, the measurement can be missed at the positions where the measuring arms can not contact, so that any problem can not be solved, and the accuracy is not high.
(6) The electromagnetic flaw detection well logging method comprises the following steps: the method can detect the wall thickness change (corrosion) and the damage condition of the oil casing in the oil pipe, can also accurately analyze the damage conditions of corrosion, breakage, deformation and the like of the casing in a single casing well, and provides a reference basis for the maintenance of the damaged well. The method also has certain limitations because the instrument accuracy does not reflect the small hole in the measurement range.
Application number is: 200410036230.X, the Chinese patent of invention, discloses a method for detecting the leakage point of casing by using a storage type ultrasonic flowmeter, which comprises a test vehicle, a storage type ultrasonic flowmeter and a detection method, and is characterized in that the storage type ultrasonic flowmeter is connected to a steel wire of a roller of the test vehicle, the steel wire is put down to the upper part of a perforation section of an oil-water well, water is injected into the well by using stable flow, and then the storage type ultrasonic flowmeter is lifted up to a well head according to a certain interval distance and a certain retention time in sequence. Utilize storage formula ultrasonic flowmeter to have the function of surveying casing pipe cross section flow, detect the flow change of whole pit shaft, propose storage formula ultrasonic flowmeter well head, be connected with the computer, playback test data confirms the sleeve pipe leakage point according to flow change, but this patent also need carry out a lot of repetition and detect, just can lock the sleeve pipe leakage point, and work load is big, and the process is loaded down with trivial details, and measuring speed is slower, and the rate of accuracy is not high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a casing leak-point detection device and a casing leak-point detection method, which adopt ultrasonic measurement, utilize the continuity of a continuous oil pipe, realize the uninterrupted measurement of points with different depths by the sealing action of a wellhead packer and the centering characteristic of a centralizer and improve the measurement speed and accuracy. Ultrasonic energy has extremely strong penetrability, and compared with the audio sound wave of the same energy, the distance that ultrasonic wave propagated is relatively short, and ultrasonic wave propagation distance is short usually in the well bore, and the signal of detecting can be very close to leaking the source to guarantee accurate leak detection.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a casing pipe detects leak source device, includes well head packer, coiled tubing centralizer and data measurement appearance, well head packer and well head bushing, and coiled tubing centralizer lower extreme and data measurement appearance are all fixed on coiled tubing, the well head packer includes the packer body, and this internal sealing device that is equipped with of packer, coiled tubing centralizer includes upper fixed ring and lower fixed ring, and upper fixed ring and lower fixed ring pass through elastomeric element and connect, and the data measurement appearance includes first ultrasonic data measurement appearance and second ultrasonic data measurement appearance, and first ultrasonic data measurement appearance and second ultrasonic data measurement appearance are all fixed through protection device.
Preferably, the sealing device comprises an upper sealing device and a lower sealing device, the upper sealing device comprises a sealing rubber ring, and a top plate and a sealing cover plate are arranged on the sealing rubber ring.
In any of the above embodiments, preferably, the sealing rubber ring is tapered.
Preferably, in any of the above schemes, the lower sealing device comprises a shutter and a right sealing member, and the hand turntable controls the opening of the shutter through a linkage screw.
In any of the above schemes, preferably, the lower part of the packer body is further provided with a male buckle.
In any of the above embodiments, preferably, the elastic member is a spring.
Preferably, in any of the above schemes, the lower fixing ring is fixed on the outer wall of the coiled tubing and moves up and down along with the coiled tubing.
In any of the above embodiments, preferably, a steel bar is further connected between the upper fixing ring and the lower fixing ring.
The preferable of any above scheme is that the number of the steel bars is four, and the steel bars are vertically outwards thrown under the contraction action of the springs.
In any of the above schemes, preferably, the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are symmetrically arranged.
Preferably, in any of the above schemes, the protection device is annular and hollow, and the coiled tubing is fixed by penetrating through the hollow ring of the protection device.
In any of the above aspects, preferably, the first ultrasonic data measuring instrument includes a first ultrasonic receiving probe, and the second ultrasonic data measuring instrument includes a second ultrasonic receiving probe.
In any of the above schemes, preferably, the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument further include a piezoelectric sensor, a digital signal processing unit, a signal amplifier, a data storage unit, and an ultrasonic signal receiving probe.
In any of the above schemes, preferably, the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are arranged at an interval of 5 meters from top to bottom.
Preferably, in any of the above schemes, the number of the coiled tubing centralizers is two, and the two coiled tubing centralizers are close to the ultrasonic data measuring instrument from top to bottom.
The invention also provides a detection method of the bushing leak detection device, which comprises the following steps:
before the device enters a well, checking whether the connection of an ultrasonic data measuring instrument is normal, whether information transmission is smooth and whether a wellhead sealing device is intact, and putting the ultrasonic data measuring instrument to a specified depth;
starting a wellhead packer, screwing a sealing cover plate on a sealing rubber ring, and manually closing a lower sealing device to ensure wellhead sealing;
and (3) injecting water into the casing through the coiled tubing to ensure that the wellhead pressure of the casing is stabilized at 20MPa in the whole measurement process.
Step (4), starting the data measuring instrument, simultaneously monitoring the ultrasonic signal of the depth point, and after obtaining the stable ultrasonic data signal, automatically identifying and determining the data of the point by a software system to prompt the completion of the measurement of the point;
step (5), opening the lower sealing device, lifting the coiled tubing by 10 meters, sealing the lower sealing device again, starting measurement of the next point after obtaining the stable ultrasonic data signal, and repeating the steps to finish measurement of the whole shaft;
step (6), pressure relief is carried out, and a casing detection leak source device in the well is taken out;
and (7) connecting a data storage unit of the ultrasonic data measuring instrument with a calculator, and reading the measured depth and ultrasonic signal data. The above scheme is preferred that the manual closing lower sealing device drives the linkage screw to rotate by rotating the manual turntable clockwise, so that the gate plate is closed.
The ultrasonic measurement principle of the invention is as follows: the ultrasonic data measuring instrument mainly comprises a piezoelectric sensor, an ultrasonic signal receiving probe, a signal amplifier, a digital signal processing unit and a data storage unit. The ultrasonic signal receiving probe is arranged outside the protection device, and other components are arranged inside the annular structure of the protection device in an integrated mode. Piezoelectric sensors produce a very low voltage, proportional to the signal strength produced by the acoustic wave formed at the drain. To extract the frequencies we want. The small piezoelectric analog signal is amplified by a signal amplifier and passed through a digital signal processing unit. The digital signal processing unit extracts a stable signal source from the obtained amplified signal and converts the audio signal into a digitized signal. Stored in the data storage unit in the form of a frequency size. And connecting the data storage unit with a calculator, reading the measured depth and ultrasonic signal data, drawing a two-dimensional vertical profile, and judging the leakage point of the casing.
Has the advantages that:
the invention has the beneficial effects that:
the invention provides a casing leak detection device and a casing leak detection method, wherein the casing leak detection device comprises a wellhead packer, a coiled tubing centralizer and a data measuring instrument, the wellhead packer is connected with a wellhead casing, the coiled tubing centralizer and the data measuring instrument are fixed on a coiled tubing, the wellhead packer comprises a packer body, a sealing device is arranged in the packer body, the coiled tubing centralizer comprises an upper fixing ring and a lower fixing ring, the upper fixing ring and the lower fixing ring are connected through an elastic component, the data measuring instrument comprises a first ultrasonic data measuring instrument and a second ultrasonic data measuring instrument, and the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are fixed through a protection device. The device and the method for detecting the leakage point of the casing pipe have the advantages that the measuring speed is greatly improved by means of the continuity of the coiled tubing. The continuous oil pipe centralizer enables the data measuring instrument to be suitable for measuring the variable-diameter casing pipe, and overcomes the defects in the prior art. Meanwhile, the dynamic effect of the ultrasonic water has abnormal sensitivity, the measurement is efficient and rapid, and the data measuring instrument has wide applicability and reliability of a test principle, so that the operation of detecting the leakage point is simpler, more convenient and more effective.
(1) Ultrasonic waves have strong penetrability like sound frequency, but compared with sound waves of the sound frequency with the same energy, the distance of ultrasonic wave propagation is relatively short, when an ultrasonic signal is detected, the detection is close to an instrument leak point, and the accuracy is improved.
(2) On the basis that the wellhead packer can seal and ensure that the coiled tubing is lifted, the continuous measurement of data under a high-pressure state is realized by virtue of the length characteristic of the coiled tubing, the integrity of the data is ensured, and the operating efficiency is improved;
(3) in the process that the data measuring instrument is lifted and lowered along with the coiled tubing, the data measuring instrument is easily collided with the inner wall of the casing pipe under the influence of swinging, and the surface of the data measuring instrument is damaged due to multiple times of impact friction or the internal instrument is caused to lose effectiveness due to long-term vibration. During the measurement process, the normal reception of the ultrasonic signals is influenced by the disturbance generated by the contact of the data measuring instrument and the inner wall of the casing. Under the high-pressure water environment, water is easy to enter the annular protection device of the data measuring instrument, so that the circuit of the data measuring instrument is short-circuited and the instrument fails. Therefore, the invention provides the coiled tubing centralizer with the variable diameter, which can keep the data measuring instruments on the upper section and the lower section of the coiled tubing centralizer at the middle position of a casing by means of the contraction of the spring and the relaxation of the tough steel bars when the inner diameter of the casing is changed in the measuring process. For example, when the coiled tubing centralizer enters a casing with a larger inner diameter from a casing with a smaller inner diameter, the spring expands the steel bar outwards under the contraction action until the steel bar is in contact with the inner wall of the casing, and the centralizer keeps stable when the contraction force of the spring is balanced with the extrusion of the casing wall on the steel bar. Therefore, in the whole process of lifting and lowering the coiled tubing, the data measuring instruments at the upper and lower section ends of the coiled tubing centralizer are all positioned in the middle of the casing, and contact with the casing wall is effectively avoided.
(4) The leakage points of part of the casing are generally small, the space for water flow to pass through is very narrow and is difficult to be perceived by naked eyes, and due to the plugging and wrapping effects of the cement sheath outside the casing, water can seep into the stratum only when the part of the leakage points are pressurized inside the casing, and the result that the casing is suppressed and fails is generated. Each data measurement must therefore be performed in a closed space pressurized by water injection. Traditional device water injection pressurization before measuring at every turn, the tubular column is lifted in the pressure release after measuring, like this not only greatly increased work load, moreover relapse pressure boost, pressure release accelerate sealing equipment's strain, and it is ageing with higher speed, cause the operation risk. The wellhead sealer disclosed by the invention effectively solves the problems of casing sealing and pipe column lifting, the conical sealing rubber ring at the upper part plays a main sealing role, the coiled tubing is tightly wrapped by the conical sealing rubber ring, and the coiled tubing can be smoothly lifted under the condition that the casing is suppressed due to the smooth surface characteristic of the coiled tubing, so that repeated pressure relief and equipment disassembly and assembly are avoided. When data are measured, the manual gate plate sealing device at the lower part is closed, and the sealing reliability is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the external overall structure of a preferred embodiment of the casing leak detection device of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a partial schematic view of FIG. 1;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a partial schematic view of FIG. 2;
FIG. 6 is a side view of FIG. 5;
FIG. 7 is another partial schematic view of FIG. 2;
FIG. 8 is a side view of FIG. 7;
FIG. 9 is a two-dimensional vertical cross-sectional view of the casing leak detection method measurement in accordance with the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1
In order to achieve the purpose, the invention adopts the technical scheme that:
as shown in fig. 1-8, a casing leak-off detection device comprises a wellhead packer 1, a coiled tubing centralizer 2 and a data measurement instrument 3, wherein the wellhead packer 1 is connected with a wellhead casing 14, and the lower end of the coiled tubing centralizer 2 and the data measurement instrument are both fixed on a coiled tubing 4.
The wellhead packer 1 comprises an upper sealing device and a lower sealing device, the upper sealing device comprises a sealing rubber ring 5, a top plate 6 and a sealing cover plate 7 are arranged on the sealing rubber ring 5, the sealing rubber ring 5 is conical, and the sealing rubber ring 5 has a main sealing function. The conical sealing rubber ring 5 is extruded by the downward pressing acting force of the upper sealing cover plate 7, so that the conical sealing rubber ring 7 is compressed downward, the whole body is closed to the middle coiled tubing 4, the coiled tubing 4 is tightly wrapped, and the sealing performance of the sleeve 14 is ensured in the process that the coiled tubing 4 moves up and down. The main function of the wellhead packer 1 is to ensure that the casing 14 can be sealed, while the coiled tubing 4 can be moved up and down under casing pressure.
The lower sealing device comprises a shutter plate 8 and a right sealing component 9, and a hand turntable 10 controls the opening of the shutter plate 8 through a linkage screw rod 11. The lower sealing device is auxiliary sealing and needs manual operation. When measuring data, the flashboards 8 on the two sides are closed, the sealing effect in the measuring process is ensured, when the coiled tubing 4 is lifted, the flashboards 8 on the two sides are opened, the friction force in the lifting structure of the coiled tubing 4 is reduced, and the flashboards 8 are mainly used for ensuring the sealing reliability and safety.
The coiled tubing centralizer 2 is of a vertically symmetrical structure. The coiled tubing centralizer 2 is integrally in a lantern shape and comprises an upper fixing ring 15 and a lower fixing ring 16, the lower fixing ring 16 is fixed on the outer wall of the coiled tubing 4 and moves up and down along with the coiled tubing 4, and the upper fixing ring 15 is not fixed on the outer wall of the coiled tubing 4. The upper fixing ring 15 and the lower fixing ring 16 are connected through a spring 12, the inner diameters of the upper fixing ring 15 and the lower fixing ring 16 are used for allowing the coiled tubing 4 to pass through, in addition, the upper fixing ring 15 and the lower fixing ring 16 are also connected through a plurality of steel bars 13 with strong toughness, and under the contraction action of the spring 12, the steel bars 13 are vertically outwards thrown.
The coiled tubing centralizer 2 extends by the expansion and contraction of the spring 12 and the extrusion of the steel bar 13, so that the coiled tubing 4 is in a centered position, and the data measuring instrument keeps the centered position when passing through the casings 14 with different inner diameters. Due to the arrangement of the coiled tubing centralizer 2, on one hand, the sealing failure of the device and the damage of internal parts caused by long-term friction and severe vibration in the process that the data measuring instrument is lifted and lowered along with the coiled tubing can be avoided. On the other hand, the ultrasonic data measuring instrument is prevented from being in contact with the inner wall of the sleeve to generate disturbance to influence the reception of ultrasonic signals in the measuring process, so that measuring errors are avoided.
In the process of lifting and lowering the ultrasonic data measuring instrument along with the coiled tubing, the ultrasonic data measuring instrument is easily collided with the inner wall of the casing 14 under the influence of swinging, and the surface of the ultrasonic data measuring instrument is damaged or the internal instrument fails to vibrate for a long time due to multiple times of impact friction. During the measurement process, the normal reception of the ultrasonic signals is influenced by the disturbance generated by the contact of the data measuring instrument and the inner wall of the casing. Under the high-pressure water environment, water is easy to enter the annular protection device of the data measuring instrument, so that the circuit of the data measuring instrument is short-circuited and the instrument fails. Therefore, the invention provides the coiled tubing centralizer 2 with the variable diameter, and the data measuring instruments on the upper section and the lower section of the coiled tubing centralizer 2 are kept at the middle position of the casing 14 by means of the contraction of the spring 12 and the relaxation of the flexible steel bar 13 when the inner diameter of the casing 14 is changed in the measuring process, so that the contact with the casing wall is effectively avoided. The main function of the ultrasonic data measuring instrument is to collect ultrasonic signals at the measuring depth. In order to ensure the measurement accuracy, the ultrasonic data measuring instrument comprises two sets of measuring instruments, namely a first ultrasonic data measuring instrument 31 and a second ultrasonic data measuring instrument 32, wherein the first ultrasonic data measuring instrument 31 and the second ultrasonic data measuring instrument 32 are both provided with the coiled tubing centralizer 2. In order to ensure the detection speed, the lifting interval of the coiled tubing 4 is 10 meters, but the propagation distance of the ultrasonic signal at the leakage point in the casing 14 is short, and in order to avoid missing the ultrasonic signal coverage area at the leakage point due to the overlarge lifting interval of the coiled tubing 4, two sets of detection devices, namely two sets of coiled tubing centralizers 2 and two sets of ultrasonic data measuring instruments are arranged, wherein the distance between the two ultrasonic data measuring instruments is fixed to be 5 meters. With the continuous oil pipe 4 lifted by 10 meters for measurement, single-point measurement data are obtained every 5 meters corresponding to the ultrasonic data measuring instrument, so that the data measuring range is ensured to completely cover the ultrasonic radiation area. The detection speed is ensured and the accuracy is improved. The first ultrasonic data measuring instrument 31 and the second ultrasonic data measuring instrument 32 are both fixed by the protection device 17. The first ultrasonic data measuring instrument 31 and the second ultrasonic data measuring instrument 32 are symmetrically disposed. The protection device 17 is annular and hollow.
The first ultrasonic data measuring instrument 31 comprises a first ultrasonic receiving probe 18, a piezoelectric sensor, a digital signal processing unit and a data storage unit, the second ultrasonic data measuring instrument 32 comprises a second ultrasonic receiving probe 19, a piezoelectric sensor, a digital signal processing unit and a data storage unit, and the piezoelectric sensor, the digital signal processing unit and the data storage unit are all sealed in the annular protection device 17 to avoid corrosion of high temperature, high pressure and water.
The detection method of the bushing leak detection device comprises the following steps:
and (1) before the device enters the well, checking whether the connection of the ultrasonic data measuring instrument is normal, whether information transmission is smooth and whether a wellhead sealing device is intact. And after the device is connected, the ultrasonic data measuring instrument is put down to the specified depth.
Step (2), starting the wellhead packer device 1, screwing the sealing cover plate 7 on the conical sealing rubber ring 5, and simultaneously manually closing the lower sealing device, namely rotating the manual rotary table 10 clockwise to drive the linkage screw 11 to rotate, so that the flashboard 8 is closed to ensure the wellhead sealing;
step (3) after the well mouth is sealed, the other end of the continuous oil pipe 4 is connected with a water injection vehicle, water is injected into the casing pipe 14 through the continuous oil pipe 4, the water injection vehicle tracks and records well mouth pressure data in real time, water is injected into the well mouth immediately when the well mouth pressure drops, the water injection is stopped immediately when the pressure reaches 20Mpa, and the well mouth pressure of the casing pipe 14 is guaranteed to be stabilized at 20Mpa in the whole measurement process;
step (4), starting the data measuring instrument at the moment, monitoring the ultrasonic signal of the depth point, and automatically identifying and determining the data of the point by the software system after obtaining the stable data signal to prompt the completion of the measurement of the point;
step (5), the lower sealing device is opened by rotating the manual turntable 10 anticlockwise, the coiled tubing 4 is lifted by 10 meters, the manual turntable 10 is rotated clockwise again to seal the lower sealing device, the measurement of the next point is started after stable data is obtained, and the measurement of the whole shaft is finished by analogy in sequence;
step (6), releasing pressure, and taking out the casing pipe leakage point detection device in the well;
and (7) connecting a data storage unit of the ultrasonic data measuring instrument with a calculator, reading the measured depth and ultrasonic signal data, and judging the leakage point of the casing.
According to the measured depth and the corresponding ultrasonic signal data, a two-dimensional vertical sectional diagram is formed, wherein the ordinate represents the frequency response coefficient, (the higher the frequency response coefficient is, the stronger the ultrasonic signal is), and the abscissa represents the measured depth, and the depth increases from top to bottom. On one hand, the propagation distance of the ultrasonic signal generated at the leak point is relatively short, and on the other hand, the strength of the signal is in positive correlation with the distance from the measurement point to the leak point, so that the point with the strongest ultrasonic signal can be judged as the leak point of the casing according to the display on the cross-sectional view, as shown in fig. 1, it can be seen that the ultrasonic signal is strongest at 1300 m, that is, the leak point of the casing is positioned at 1300 m. The invention provides a device and a method for detecting a leak point of a sleeve, which adopt an ultrasonic principle to measure. The precise judgment of the depth of the leaking point is the premise of rapid accident handling, and the casing pipe leaking point detection device and method provided by the invention greatly improve the measurement speed by means of the continuity of the coiled tubing 4. The coiled tubing centralizer 2 enables the data measuring instrument to be suitable for measuring the reducing casing 14, and overcomes the defects in the past. Meanwhile, the dynamic effect of the ultrasonic water has abnormal sensitivity, the measurement is efficient and rapid, the data measuring instrument is widely applicable and the reliability of the test principle is high, so that the operation of detecting the leakage point is simpler, more convenient and more effective, and the method has the following beneficial effects:
(1) ultrasonic waves have strong penetrability like sound frequency, but compared with sound waves of the sound frequency with the same energy, the distance of ultrasonic wave propagation is relatively short, when an ultrasonic signal is detected, the detection is close to an instrument leak point, and the accuracy is improved.
(2) On the basis that the wellhead packer 1 can seal and ensure that the coiled tubing 4 is lifted, the length characteristic of the coiled tubing 4 is used for realizing continuous measurement of data under a high-pressure state, the integrity of the data is ensured, and the operation efficiency is improved.
Example 2
Different from the embodiment 1, the detection method of the casing leak detection device comprises the following steps:
and (1) before the device enters the well, checking whether the connection of the ultrasonic data measuring instrument is normal, whether information transmission is smooth and whether a wellhead sealing device is intact. And after the device is connected, the ultrasonic data measuring instrument is put down to the specified depth.
Step (2), starting the wellhead packer device 1, screwing the sealing cover plate 7 on the conical sealing rubber ring 5, and simultaneously manually closing the lower sealing device, namely rotating the manual rotary table 10 clockwise to drive the linkage screw 11 to rotate, so that the flashboard 8 is closed to ensure the wellhead sealing;
step (3) after the well mouth is sealed, the other end of the continuous oil pipe is connected with a water injection vehicle, water is injected into the casing pipe 14 through the continuous oil pipe 4, the water injection vehicle tracks and records well mouth pressure data in real time, water is injected into the well mouth immediately when the well mouth pressure drops, the water injection is stopped immediately when the pressure reaches 20Mpa, and the well mouth pressure of the casing pipe 14 is guaranteed to be stabilized at 20Mpa in the whole measurement process;
step (4), starting the data measuring instrument at the moment, monitoring the ultrasonic signal of the depth point, and automatically identifying and determining the data of the point by the software system after obtaining the stable data signal to prompt the completion of the measurement of the point;
step (5), opening the lower sealing device by rotating the manual rotary table 10 anticlockwise, lifting the coiled tubing 4 by 8 meters, rotating the manual rotary table 10 clockwise again to seal the lower sealing device, starting measurement of the next point after stable data is obtained, and repeating the steps to finish measurement of the whole shaft;
and (6) then releasing the pressure, taking out the casing pipe leakage point detection device in the well, connecting a data storage unit of the ultrasonic data measuring instrument with a calculator, and reading the measured depth and ultrasonic signal data.
Example 3
Different from embodiment 1, the quantity of coiled tubing centralizer 2 is a plurality of, and a plurality of coiled tubing centralizer 2 interval sets up from top to bottom, and coiled tubing centralizer 2 is upper and lower symmetrical structure. The coiled tubing centralizer 2 is integrally in a lantern shape and comprises an upper fixing ring 15 and a lower fixing ring 16, the lower fixing ring 16 is fixed on the outer wall of the coiled tubing 4 and moves up and down along with the coiled tubing 4, and the upper fixing ring 15 is not fixed on the outer wall of the coiled tubing 4. The upper fixing ring 15 and the lower fixing ring 16 are connected through a spring 12, the inner diameters of the upper fixing ring 15 and the lower fixing ring 16 are used for allowing the coiled tubing 4 to pass through, in addition, the upper fixing ring 15 and the lower fixing ring 16 are also connected through four steel bars 13 with high toughness, and under the contraction action of the spring 12, the steel bars 13 are vertically outwards thrown. The coiled tubing centralizer 2 stretches through the expansion and contraction of the spring 12 and the extrusion of the steel bar 13, so that the coiled tubing 4 is located at the central position, the data measuring instrument keeps the central position when passing through the casings 14 with different inner diameters, the position of a measuring point in a flow field is predetermined, and a basis is provided for fitting the position of a leak point.
Example 3
Different from the embodiment 1, the wellhead packer 1 comprises a packer body, and a male buckle 22 is further arranged on the lower portion of the packer body, so that the stability of the wellhead packer 1 is further ensured.
Example 4
Different from embodiment 1, coiled tubing centralizer 2 wholly is the lantern form, including upper fixed ring 15 and lower fixed ring 16, fixed ring 15 and lower fixed ring 16 pass through spring 12 and connect, and upper fixed ring 15 and lower fixed ring 16 still are connected by four billet 13 that toughness is stronger, and four billet 13 are the even interval setting, and under the shrink effect of spring 12, billet 13 is vertical and is the form of throwing outward.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. The casing leak detection device is characterized by comprising a wellhead packer, a coiled tubing centralizer and a data measuring instrument, wherein the wellhead packer is connected with a wellhead casing, the coiled tubing centralizer and the data measuring instrument are fixed on a coiled tubing, the wellhead packer comprises a packer body, a sealing device is arranged in the packer body, the coiled tubing centralizer comprises an upper fixing ring and a lower fixing ring, the upper fixing ring and the lower fixing ring are connected through a spring component, the data measuring instrument comprises a first ultrasonic data measuring instrument and a second ultrasonic data measuring instrument, the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are both fixed through a protection device, the first ultrasonic data measuring instrument comprises a first ultrasonic receiving probe, the second ultrasonic data measuring instrument comprises a second ultrasonic receiving probe, and the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument further comprise a piezoelectric sensor, The ultrasonic signal processing device comprises a digital signal processing unit, a signal amplifier, a data storage unit and an ultrasonic signal receiving probe, wherein the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are arranged at an interval of 5 meters from top to bottom; the sealing device comprises an upper sealing device and a lower sealing device, the upper sealing device comprises a sealing rubber ring, a top plate and a sealing cover plate are arranged on the sealing rubber ring, and the sealing rubber ring is conical; the lower sealing device comprises a flashboard and a right sealing component, and the hand turntable controls the opening of the flashboard through a linkage screw rod; and a steel bar is also connected between the upper fixing ring and the lower fixing ring, the number of the steel bars is four, and the steel bars are vertically outwards thrown under the contraction action of the spring part.
2. The casing leak-point detection device according to claim 1, wherein a male buckle is further arranged at the lower part of the packer body.
3. The casing leak detection device of claim 1, wherein the lower retaining ring is fixed to the outer wall of the coiled tubing and moves up and down with the coiled tubing.
4. A method of detecting a casing leak detection device according to any one of claims 1 to 3, comprising the steps of:
before the device enters a well, checking whether the connection of the ultrasonic data measuring instrument is normal, whether information transmission is smooth and whether a wellhead sealing device is intact, and after the connection of the device is finished, putting the ultrasonic data measuring instrument to a specified depth;
starting a wellhead packer, screwing a sealing cover plate on a sealing rubber ring, and manually closing a lower sealing device to ensure wellhead sealing;
injecting water into the casing through the coiled tubing to ensure that the wellhead pressure of the casing is stabilized at 20Mpa in the whole measurement process;
step (4), starting the data measuring instrument, simultaneously monitoring the ultrasonic signal of the depth point, and after obtaining the stable ultrasonic data signal, automatically identifying and determining the data of the point by a software system to prompt the completion of the measurement of the point;
step (5), opening the lower sealing device, lifting the coiled tubing by 10 meters, sealing the lower sealing device again, starting measurement of the next point after obtaining the stable ultrasonic data signal, and repeating the steps to finish measurement of the whole shaft;
step (6), pressure relief is carried out, and a casing detection leak source device in the well is taken out;
and (7) connecting a data storage unit of the ultrasonic data measuring instrument with a calculator, and reading the measured depth and ultrasonic signal data.
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| CN107938638B (en) * | 2017-11-16 | 2020-11-17 | 江西省交通运输科学研究院有限公司 | Mechanical device for mounting inclinometer pipe and mounting method thereof |
| KR101894245B1 (en) * | 2018-01-24 | 2018-09-05 | 한국원자력연구원 | Monitering system for radiological surveillance of groundwater and operation method thereof |
| CN109236281B (en) * | 2018-11-28 | 2023-08-01 | 中国石油天然气集团有限公司 | Device and method for detecting annular pressure of gas storage and natural gas well |
| CN109711090B (en) * | 2019-01-15 | 2023-06-16 | 长江大学 | Method and device for determining annulus fluid comprehensive friction coefficient |
| CN111594138A (en) * | 2020-05-28 | 2020-08-28 | 中国石油天然气集团有限公司 | Device for comprehensively testing working parameters of casing |
| CN111810117A (en) * | 2020-07-06 | 2020-10-23 | 中国石油天然气集团有限公司 | Casing damage well leakage point detection transplanting method |
| CN111608650B (en) * | 2020-07-09 | 2020-12-11 | 西安海联石化科技有限公司 | Method for detecting oil well oil pipe and casing pipe defects by using infrasonic waves |
| CN111780932B (en) * | 2020-07-14 | 2021-12-21 | 深圳市效利工程设备有限公司 | Be used for underground water pipe leak source detection device |
| CN111963154A (en) * | 2020-09-01 | 2020-11-20 | 中国石油天然气股份有限公司 | Casing damage oil well leakage point identification method |
| CN114607313A (en) * | 2022-03-15 | 2022-06-10 | 陕西山秦能源技术服务有限公司 | Solid-phase-free gel plugging method |
| CN116086718A (en) * | 2022-11-08 | 2023-05-09 | 中国石油天然气集团有限公司 | Oil and gas well casing leakage point detection equipment, system, detection method and application |
| CN117349634B (en) * | 2023-12-06 | 2024-02-09 | 大庆长垣能源科技有限公司 | Method for reconstructing integrity of horizontal well fracturing casing based on data driving |
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