CN111042800B - Underground television test pipe column and method for horizontal well coiled tubing - Google Patents
Underground television test pipe column and method for horizontal well coiled tubing Download PDFInfo
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- CN111042800B CN111042800B CN201811193875.2A CN201811193875A CN111042800B CN 111042800 B CN111042800 B CN 111042800B CN 201811193875 A CN201811193875 A CN 201811193875A CN 111042800 B CN111042800 B CN 111042800B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a horizontal well coiled tubing underground television test pipe column and a test method, wherein the pipe column comprises an underground television test terminal, a ground display instrument terminal, a fiber-optic cable penetrating coiled tubing and a quick connector, a circulating well washing tool, a headstock, a signal transmitter and a centralizer which are matched with the underground television test terminal; the underground television testing string is characterized in that the lower end of the centralizer is connected with the upper end of the underground television testing terminal, the upper end of the centralizer is connected with the lower end of the signal transmitter, the optical fiber cable penetrates through the inside of the continuous oil pipe, the upper end of the optical fiber cable is connected to the ground display instrument terminal, the lower end of the optical fiber cable stretches out of the continuous oil pipe, then penetrates through a quick connector of the continuous oil pipe and a circulating well washing tool to be connected with the inner circuit of the headstock, the headstock is connected with the upper end of the signal transmitter, the butt joint of the optical fiber cable signal transmission circuit in the signal transmitter is realized, the underground television testing string of the horizontal well continuous oil pipe can complete visual detection in a horizontal well section and can wash a well in real time, the visual effect of detection is improved, and the underground television testing string has the characteristics of simplicity in operation and accurate effect.
Description
Technical Field
The invention relates to a horizontal well shaft detection process technology, in particular to a horizontal well coiled tubing downhole television test tubular column and a test method.
Background
In the development and production process of oil fields, in order to know the internal condition of a shaft, more targeted and accurate technological measures are formulated, test methods such as sound waves, electromagnetism, well diameter, well temperature and the like are often required to be adopted, the shaft and stratum information is acquired through corresponding interpretation means, the shaft information is indirectly acquired by the methods, and certain errors of equipment or human factors exist compared with the test methods. The downhole television testing technology can more intuitively, rapidly and accurately reflect the condition of the shaft. The underground television testing technology conveys the instrument into the underground through the optical fiber cable, acquires the shaft information by using the underground camera equipment, and transmits the acquired shaft information to the ground equipment in real time through the optical fiber for video imaging, so that real-time observation of the shaft is realized. The technology can realize shaft detection and real-time imaging of vertical wells and wells with smaller inclination within 3500m, well flushing is fully performed before a test instrument is required to be put down, test effect is guaranteed, even if a weighting rod is arranged for wells with larger inclination or poorer well path and continuous oil well flushing is performed, a test tubular column can not be smoothly put down and detected, and the proportion of the highly inclined wells and horizontal wells in oil-gas well development is larger and larger along with the deep development of an oil field, so that the application prospect of the underground television test technology based on optical fiber cable connection and transmission is wide, but the application of the underground television test technology is limited to a certain extent in terms of the current technical condition.
The headstall is a common technology of oil wells in oil fields, for example, a waterproof and sealed two-way quick connecting headstall is disclosed in the publication, edition source of logging technical information, 2002 (4): 53-53, the author is a round-the-clock, a waterproof and sealed two-way quick connecting headstall, and the headstall comprises a two-way quick torpedo connector, an inner silicone grease sealing cavity in a headstall main body with a waterproof and sealing function, a pressure releaser and the like. The inner silicone grease seal cavity is designed so that moisture entering during docking cannot reach the weld of the seal insert; the design of the pressure releaser ensures that the liquid which enters into the electrode fiber cable steel wire cannot enter into the outer silicone grease cavity, so that the insulation performance of the headstall is excellent, and meanwhile, the connection speed of the torpedo connector is improved by about 10 times due to the design of the bidirectional rapid torpedo connector. The headstall can be used for multiple times without maintenance.
Through the search of patent literature, tubular strings using camera downhole testing have also been disclosed, for example, application number: 200620158543.7 publication No. 2008-01-30 discloses a downhole television downhole instrument, which comprises a downhole circuit and a ground circuit, wherein the downhole circuit is connected through a logging fiber optic cable and comprises a camera, a sampling coding unit, an image compression unit, a digital signal processor and a sending module which are sequentially connected; the ground circuit part comprises a receiving module, a digital signal processor, an image decompression unit, a digital-to-analog converter, a video card and a display, storage and processing terminal which are sequentially connected. The device can be used for well operation with larger depth, has small volume, clear image and long transmission distance, and has strong anti-interference capability in the image transmission process.
The above disclosed technology only provides a television monitoring device, but the application can freely lift and put in a horizontal well section and a highly-inclined well section, can carry out visual detection of a shaft at any position, can carry out real-time circulating well flushing, and improves the visual effect of detection.
Disclosure of Invention
The invention aims to provide a horizontal well coiled tubing downhole television test tubular column and a test method, which solve the problem that the conventional horizontal well and high-inclination well cannot adopt an optical fiber downhole television technology to test a shaft. The underground television test pipe column of the continuous oil pipe of the horizontal well can be lifted and put freely at a horizontal well section and a highly-inclined well section, can carry out visual detection of a shaft at any position, can wash the well in real time, improves visual detection effect, and has the characteristics of simplicity in operation and accurate effect.
In order to achieve the purpose, the invention adopts the following technical scheme that the horizontal well coiled tubing underground television test pipe column comprises an underground television test terminal, a ground display instrument terminal and an optical fiber cable; the well flushing device also comprises a continuous oil pipe, a quick connector, a circulating well flushing tool, a headstall, a signal transmitter and a centralizer which are sequentially connected from top to bottom; the lower end of the centralizer is connected with the upper end of the underground television testing terminal, the upper end of the centralizer is connected with the lower end of the signal transmitter, the optical fiber cable penetrates through the inside of the continuous oil pipe, the two ends of the optical fiber cable extend out, the upper end of the optical fiber cable is connected to the terminal of the ground display instrument, the lower end of the optical fiber cable extends out of the continuous oil pipe, then the optical fiber cable passes through the quick connector of the continuous oil pipe and the circulating well washing tool and is connected with the internal circuit of the headstall, so that signal transmission connection is established with the signal transmitter, and the underground television testing terminal is electrically connected with the signal transmitter through the internal circuit of the centralizer.
The underground television test terminal is divided into a front part and a rear part of a camera system and a lighting system, the camera system is positioned at the front end of the underground television test terminal, the lighting system is positioned at the rear end of the underground television test terminal, and the lighting system provides a light source for normal shooting of the camera system.
The centralizer comprises a centralizer body, a supporting rod, spring pieces and tension springs, wherein the supporting rod is sleeved outside the centralizer body, the tension springs are sleeved outside the supporting rod, the lengths of the supporting rod and the spring pieces exceed those of the tension springs, the two ends of each spring piece are fixed at the two ends of each tension spring, the middle of each spring piece bulges outwards, and at least two spring pieces are uniformly distributed on the circumference of each tension spring in the same mode.
The circulating well-flushing tool comprises a tool outer barrel, a radial extrusion sealing device and an axial movement driving device. The axial movement driving device and the radial extrusion sealing device are assembled in the tool outer cylinder, the axial movement driving device is connected to the lower end of the radial extrusion sealing device, the inner wall of the tool outer cylinder is provided with a conical surface inner bulge forcing the radial extrusion sealing device to radially shrink, and the tool outer cylinder is provided with a circulation port which is positioned above the conical surface inner bulge.
The lower end of the centralizer is connected with the underground television testing terminal in a plug-in mode, is fixed from the side face through screws, and is provided with a sealing ring at the joint to realize sealing.
The upper end of the centralizer is connected with the lower end of the signal transmitter in a plug-in mode, is fixed from the side face through screws, and is sealed by installing a sealing ring at the joint.
The upper end of the signal transmitter is connected with the lower end of the headstock in a plug-in mode, the signal transmitter is fixed from the side face through screws, and a sealing ring is installed at the joint to realize sealing.
The radial extrusion sealing device comprises a split holding ring and sealing rubber blocks, wherein the upper end of the split holding ring is provided with at least three split, the lower end of the split holding ring is provided with a cylinder, the upper end of the outer wall of the split is also provided with a cone shape which is matched with the bulge in the conical surface of the outer cylinder of the tool, and the sealing rubber blocks are vulcanized on each split of the split holding ring in a split manner.
And after being folded inwards, each sealing rubber block forms a circular through hole for the passage of the optical fiber cable at the inner side.
The axial movement driving device further comprises an adjusting cylinder, the adjusting cylinder is connected to the lower end of the pushing cap, a symmetrical through hole is formed in the lower end of the adjusting cylinder in the radial direction, the pushing cap can be pushed by rotating the adjusting cylinder, the radial extrusion sealing device is driven to move upwards, and the split holding ring is folded inwards along the inner conical surface of the tool outer cylinder.
In order to achieve the purpose, the invention adopts the following technical scheme that the lower end of the optical fiber cable passes through the continuous oil pipe and then sequentially passes through the continuous oil pipe quick connector and the circulating well washing tool to reach the inside of the headstock to be connected with the optical fiber cable led out by the signal transmitter; when the optical fiber cable passes through the inside of the circulating well-flushing tool, each sealing rubber block is extruded and folded at the same time, so that the optical fiber cable is tightly held, well-flushing liquid is isolated from the space below the sealing rubber blocks, and the well-flushing liquid enters and exits from the circulating port on the side surface of the circulating well-flushing tool; meanwhile, the optical fiber cable penetrating through the continuous oil pipe passes through the centralizer while supplying power for normal operation of circuits in the signal transmitter after the inner core of the optical fiber cable is connected to the signal transmitter, the power is supplied to the illumination and camera system of the lower underground television test terminal, the transmission of electric quantity among all tool instruments is realized through the needle-shaped plug, the power supply quantity can lighten the illumination component and enable the camera system to collect image information, the image information collected by the camera system is transmitted into the signal transmitter along the electric wire and the needle-shaped plug in an electric signal mode by the photoelectric converter in the underground television test terminal, and then the electric signal is recovered into an optical signal through the electric-optical converter in the signal transmitter, the optical signal is transmitted to the ground in real time through the optical fiber by the optical wave transmitter in the signal transmitter, and the ground display instrument terminal displays the video information captured by the underground television test terminal in a display through the collection and video decoding of the optical signal. The underground television testing terminal can move along with the continuous oil pipe to test the underground arbitrary position and send and transmit the underground arbitrary position to the ground display instrument terminal for real-time imaging through the signal transmitter and the optical fiber cable; if the condition that the well is blurred and cannot be seen clearly occurs in the detection process, the ground equipment can be started at any position immediately to perform circulating well flushing, the well flushing and the detection are realized, damage to a lower-end test instrument is avoided, and accordingly the overall high-quality detection effect of various inclined shafts is achieved.
Compared with the prior art, the invention has the following beneficial effects:
the components of the continuous oil pipe penetrating through the optical fiber cable, the circulating well washing tool, the special headstock for connecting the optical fiber cable, the signal transmitter, the centralizer, the underground television test terminal and the like are sequentially connected to form the underground television test pipe column of the continuous oil pipe of the horizontal well, and the underground tool string is conveyed to any position in a shaft along with the gradual descending of the continuous oil pipe. The upper end of the pipe column extends out of the wellhead part, the optical fiber cable is connected with the terminal of the ground display instrument, the continuous oil pipe is connected with the ground well flushing equipment, the lower end of the optical fiber cable penetrates through the continuous oil pipe, then sequentially penetrates through the continuous oil pipe quick connector and the circulating well flushing tool, reaches the inside of the headstock and is connected with the optical fiber cable led out by the signal transmitter. When the optical fiber cable passes through the inside of the circulating well-flushing tool, all the sealing rubber blocks are extruded and folded, the optical fiber cable is tightly held, well-flushing liquid is isolated from the space below the sealing rubber blocks, and the well-flushing liquid enters and exits from the circulating port on the side face of the circulating well-flushing tool. Because coiled tubing accessible ground sled dress is equipped the drive and is arrived arbitrary position in the pit, the TV test terminal in the pit then can remove along with coiled tubing, test arbitrary position in the pit, and through signal transmitter, fiber cable, send in real time and transmit to ground display instrument terminal and carry out real-time imaging, in comparison when relying on fiber cable to pull down, can only rely on the restriction that underground tool string self gravity moved down, can't carry out high inclination and horizontal well section detection, the detection scope promotes greatly, if the condition of ambiguity appears in the testing process, can start ground equipment in the arbitrary position immediately and circulate the well, realize the detection while flushing, also can not cause destruction to lower extreme test instrument, thereby obtain the whole high quality detection effect of various well and inclined shaft.
The upper end of the circulating well-flushing tool can be connected with the tubing string, the lower end of the circulating well-flushing tool can be connected with the testing instrument, after the optical fiber cable passes through the tubing string at the upper part, the optical fiber cable can pass through the well-flushing tool from the inside of the horizontal well continuous tubing underground television testing tubing string and the testing method in a sealing way, so that the connection between the optical fiber cable and the testing instrument is realized, the optical fiber cable is released from the connection mode of directly dragging the testing instrument, the dragging force of the optical fiber cable is reduced, the operation safety of the optical fiber cable is ensured, in addition, the optical fiber cable passes through the inside of the well-flushing tool in an axial sealing way, the well-flushing circulating channel is arranged on the side wall of the well-flushing tool, and the well-flushing liquid and the testing instrument at the lower part of the optical fiber cable are effectively separated, so that the operation safety of the testing instrument is ensured.
Drawings
FIG. 1 is a schematic diagram of a horizontal well coiled tubing downhole television test string according to the present invention;
fig. 2 is a schematic diagram of the construction of a circulation well-flushing tool.
In the figure: a downhole television test terminal 1; a centralizer 2; a signal transmitter 3; a headstall 4; a circulating well-flushing tool 5; a quick connector 6; a coiled tubing 7; a floor display instrument terminal 8; a tool outer cylinder 51; a fiber optic cable 52; a sealing rubber block 53; split band 54; pushing cap 55; the cartridge 56 is adjusted.
Detailed Description
The detailed description and technical content of the present invention are described below with reference to the accompanying drawings, which are, however, only for reference and description, and are not intended to limit the present invention.
As shown in figure 1, the underground television testing tubular column of the continuous oil pipe of the horizontal well comprises an underground television testing terminal 1, a ground display instrument terminal 8, a continuous oil pipe 7, a quick connector 6, a circulating well-flushing tool 5, a headstock 4, a signal transmitter 3 and a centralizer 2 which are sequentially connected from top to bottom; the lower end of the centralizer is connected with the upper end of the underground television testing terminal, the optical fiber cable penetrates through the inside of the continuous oil pipe, the two ends of the optical fiber cable extend out, the upper end of the optical fiber cable is connected to the ground display instrument terminal, after the lower end of the optical fiber cable extends out of the continuous oil pipe, the optical fiber cable penetrates through the quick connector of the continuous oil pipe and the circulating well washing tool and is connected with the internal circuit of the headstall, so that signal transmission connection is established with the signal transmitter, and the underground television testing terminal is electrically connected with the signal transmitter.
As shown in fig. 2, the circulating well-flushing tool 5 comprises a tool outer cylinder 51, a radial extrusion sealing device and an axial movement driving device, wherein the axial movement driving device and the radial extrusion sealing device are all assembled in the tool outer cylinder, the axial movement driving device is connected to the lower end of the radial extrusion sealing device, an inner wall of the tool outer cylinder is provided with an inner conical surface bulge forcing the radial extrusion sealing device to radially shrink, and the tool outer cylinder is provided with a circulating port which is positioned above the inner conical surface bulge. The radial extrusion sealing device comprises split holding rings 54 and sealing bodies, wherein the upper ends of the split holding rings are at least three split, the lower ends of the split holding rings are cylinders, the upper ends of the outer wall of the split are also arranged to be conical and matched with bulges in the conical surface of the outer cylinder of the tool, the number of the sealing bodies is equal to that of the split, and one sealing body is arranged on the inner wall of each split. The sealing body is an arc-shaped sealing rubber block 53 which is vulcanized on the split inner wall. The axial movement driving device comprises a pushing cap 55, the outer wall threads of the pushing cap are connected with the inner threads of the tool outer cylinder in a matched mode, and the upper end of the pushing cap is connected with the lower end of the split holding ring. The axial movement driving device further comprises an adjusting cylinder 56 which is connected to the lower end of the pushing cap, and the lower end of the adjusting cylinder is radially provided with symmetrical through holes. The rubber blocks are folded inwardly to form a circular through hole on the inside for the passage of the fiber optic cable 52. At least three circulation ports are arranged, and the circulation ports are obliquely downwards arranged.
The underground television test terminal and the ground display instrument terminal belong to the prior conventional technology in the technical field, and are directly connected for use.
The underground television test terminal comprises a camera system and an illumination system. The camera shooting system is in front, the illumination system is in back, the camera shooting system comprises a camera shooting assembly, a light-transmitting cover, a current stabilizer, a camera shooting photoreceptor, a photoelectric converter, an insulating rubber plug, a conducting wire, a camera shooting system fixing hood and the like, all parts are inserted on the camera shooting system fixing hood and are connected with each other through the conducting wire in a welding mode, the illumination system comprises an illumination assembly, a voltage stabilizer, a current stabilizer, a conducting wire, an illumination photoreceptor, a protector, an insulating rubber plug and the like, all parts are inserted on the illumination system fixing hood, and all parts are connected with each other through the conducting wire in a welding mode. The camera system fixing hood and the lighting system fixing hood are hollow pipe frames processed by stainless steel metal, and the hollow sizes are in one-to-one correspondence with the sizes of parts to be spliced. The surface of the camera system fixing hood and the surface of the lighting system fixing hood are coated with high-temperature insulating glue. The camera system fixing hood and the lighting system fixing hood are inserted into the terminal outer barrel and are connected with the terminal outer barrel in a clamping groove mode. The underground television test terminal camera system is positioned at the front end of the underground television test terminal, the lighting system is positioned at the rear end of the underground television test terminal, and the lighting system provides a light source for normal shooting of the camera system.
The surfaces of the camera system fixed hood and the lighting system fixed hood are coated with high-temperature insulating glue, the temperature resistance is 120 ℃, and the thickness of the glue layer is 0.2mm-0.5mm. The camera system fixing hood and the lighting system fixing hood are inserted into the terminal outer barrel and are connected with the terminal outer barrel in a clamping groove mode.
The camera shooting assembly of the underground television test terminal is arranged at the forefront end of the underground television test terminal under the protection of the light-transmitting cover, 120-degree wide-angle shooting can be realized, the shooting frame rate of the camera shooting assembly is not lower than 30 frames/second, the full coverage and video playing smoothness of shooting of the camera shooting assembly in the moving process can be ensured, the light-transmitting cover is made of planar high-light-transmitting toughened glass, the pressure resistance is not lower than 70MPa, and the light transmittance is more than 93%.
The underground television test terminal lighting assembly is arranged at the front end of the lighting system and is exposed out of the outer barrel shell, the lighting brightness can be controlled and regulated on the ground in real time, the voltage stabilizer and the current stabilizer can limit the working current and the working voltage stability, the normal working of the lighting assembly is guaranteed, the lighting photoreceptor can sense the lighting brightness, whether the lighting assembly normally works or not is fed back to the ground, fusible metal is arranged in the protector, the fusible metal is fused when the current exceeds a limiting value, so that the power supply is cut off, and the lighting assembly is prevented from being damaged by excessive current.
The lower end of the circulating well-flushing tool is connected with the upper end of the special headstock for connecting the optical fiber cable in an inserted mode and is fixed from the side face through screws.
The lower end of the special headstock for optical fiber cable connection is connected with the signal transmitter in a plug-in mode, is fixed from the side face through screws, and is provided with a sealing ring to achieve sealing.
The lower end of the signal transmitter is connected with the upper end of the centralizer in a plug-in mode, is fixed from the side face through screws, and is provided with a sealing ring to realize sealing.
The lower end of the centralizer is connected with the underground television testing terminal in a plug-in mode, is fixed from the side face through screws, and is provided with a sealing ring to achieve sealing.
The underground television test tubular column of the horizontal well coiled tubing is characterized in that an optical fiber cable penetrates through the inside of the coiled tubing 7, two ends of the optical fiber cable extend out, the upper end of the optical fiber cable is connected to a ground display instrument terminal 8, the upper end of the coiled tubing 7 is connected with ground flushing equipment through skid equipment, other tools are from top to bottom, the lower end of the coiled tubing 7 is connected with the upper end of the circulating flushing tool 5 through a coiled tubing quick connector 6, the lower end of the circulating flushing tool 5 is connected with the upper end of a headstock 4, the lower end of the headstock 4 is connected with the upper end of a signal transmitting instrument 3, the lower end of the signal transmitting instrument 3 is connected with the upper end of a centralizer 2, a camera at the lower end of the underground television test terminal 1 is used for video acquisition downwards, the lower end of the optical fiber cable extends out of the coiled tubing 7 and then penetrates through the coiled tubing quick connector 6 and the circulating flushing tool 5, the lower end of the coiled tubing is connected with the inner circuit of the headstock 4, and thus the signal transmission connection is established with the signal transmitting instrument 3, when the optical fiber cable penetrates through the circulating flushing tool 5, the inner block of the circulating tool 5 is tightly held by the inner block of the circulating tool 5, and a sealing section is formed, the optical fiber cable can only penetrates through the inner side of the circulating tool 5, and the rubber flushing cable is sealed from the upper side of the circulating tool, and the lower side of the circulating tool is sealed, and the sealing section can pass in and the well, and the sealing section is sealed.
In the application process, after a pipe string is connected, the coiled tubing 7 is driven by a ground skid-mounted device to descend into the well, the coiled tubing 7 can drive the underground instrument string to continue to advance through the ground skid-mounted device in a high-inclination and horizontal well section, in the process of descending the pipe string, a camera at the front end of the underground television test terminal 1 performs video acquisition on the conditions of a shaft and a well wall, the acquired video signals are converted into light signals capable of being transmitted through a signal transmitter 3, the light signals are transmitted to an optical fiber cable through a headstock 4, and the light signals are transmitted to a ground display instrument terminal 8 through the optical fiber cable to be displayed, so that real-time display of underground conditions on the ground is realized. If the running-in is blocked or the visual is unclear, the circulation well flushing can be started from the inside of the continuous oil pipe 7 at any time, after the well flushing liquid passes through the continuous oil pipe 7, the well flushing liquid enters an oil sleeve annulus from the circulation well flushing tool 5, circulation is established, the ground skid-mounted equipment drives the continuous oil pipe 7 to lift and lower in the well, and the well flushing can be realized at any depth in the well, so that the underground television test terminal 1 can acquire the visual in the well more accurately and clearly.
As shown in fig. 2, a split holding ring 54 is installed inside a tool outer cylinder 51, the inclined surface of the upper part of each split is attached to the inclined surface of the lower part of the inner wall of the tool outer cylinder 51, sealing rubber blocks 53 are vulcanized on eight split inner walls of the split holding ring 54 respectively, a pushing cap 55 is installed at the lower end of the split holding ring 54, the lower end of the split holding ring 54 is sleeved in a groove on the upper part of the pushing cap 55, an adjusting cylinder 56 is connected with the internal threads of the pushing cap 55 from the lower end of the pushing cap 55, during the use, the upper end of the tool outer cylinder 51 is connected with a tubing string, the lower end of the tool outer cylinder 51 is connected with a testing instrument, an optical fiber cable 52 axially penetrates from the inside of a well washing tool and penetrates through the tool outer cylinder 51, the sealing rubber blocks 53, the split holding ring 54, the pushing cap 55 and the adjusting cylinder 56 respectively, the pushing cap 55 is driven to rotate and rise, the pushing cap 55 pushes the split holding ring 54 to move upwards, in the upward moving process, each split inclined plane moves along the lower inclined plane of the inner wall of the tool outer cylinder 51 and is simultaneously extruded by the lower inclined plane of the inner wall of the tool outer cylinder 51, the eight split plates bring the eight sealing rubber blocks 53 to retract inwards to hold the optical fiber cable 52, the optical fiber cable 52 is held tightly by the sealing rubber blocks 53 along with the rotation of the adjusting cylinder 56, and the isolation of the upper space and the lower space of the sealing rubber blocks 53 in the well washing tool is realized, so that the well washing tool is only used for passing through the optical fiber cable and not passing through well washing liquid, and the well washing liquid enters and exits from the circulating port of the outer wall of the tool outer cylinder 51, so that the testing instrument can be connected with the optical fiber cable and is isolated from the well washing liquid.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the invention, but rather to limit the scope of the invention to the equivalents of the claims to which the invention pertains.
Claims (7)
1. The underground television testing tubular column of the horizontal well coiled tubing comprises an underground television testing terminal, a ground display instrument terminal and an optical fiber cable; the device is characterized by further comprising a continuous oil pipe, a quick connector, a circulating well-flushing tool, a headstock, a signal transmitter and a centralizer which are sequentially connected from top to bottom; the lower end of the centralizer is connected with the upper end of the underground television testing terminal, the upper end of the centralizer is connected with the lower end of the signal transmitter, the optical fiber cable stretches out from two ends after passing through the inside of the continuous oil pipe, the upper end of the optical fiber cable is connected to the ground display instrument terminal, the optical fiber cable passes through the quick connector of the continuous oil pipe and the circulating well washing tool after stretching out of the lower end of the optical fiber cable, and the optical fiber cable is connected with the internal circuit of the headstall so as to establish signal transmission connection with the signal transmitter;
the circulating well-flushing tool comprises a tool outer cylinder, a radial extrusion sealing device and an axial movement driving device, wherein the axial movement driving device and the radial extrusion sealing device are assembled in the tool outer cylinder, the axial movement driving device is connected to the lower end of the radial extrusion sealing device, the inner wall of the tool outer cylinder is provided with a conical surface inner bulge which forces the radial extrusion sealing device to radially shrink, the tool outer cylinder is provided with a circulating port, and the circulating port is positioned above the conical surface inner bulge;
the radial extrusion sealing device comprises a split holding ring and a sealing rubber block, wherein the upper end of the split holding ring is provided with at least three split, the lower end of the split holding ring is provided with a cylinder, the upper end of the outer wall of the split is also provided with a cone shape which is matched with the inner bulge of the conical surface of the outer cylinder of the tool, and the sealing rubber block is vulcanized on each split of the split holding ring in a split manner; the sealing rubber blocks are folded inwards and then form a circular through hole on the inner side for the optical fiber cable to pass through;
the axial movement driving device further comprises an adjusting cylinder, the adjusting cylinder is connected to the lower end of the pushing cap, a symmetrical through hole is formed in the lower end of the adjusting cylinder in the radial direction, the pushing cap can be pushed by rotating the adjusting cylinder, the pushing cap drives the radial extrusion sealing device to move upwards, and the split holding ring is folded inwards along the inner conical surface of the tool outer cylinder.
2. The horizontal well coiled tubing downhole television test string according to claim 1, wherein the downhole television test terminal is divided into a front part and a rear part of a camera system and a lighting system, the camera system is positioned at the front end of the downhole television test terminal, the lighting system is positioned at the rear end of the downhole television test terminal, and the lighting system provides a light source for normal shooting of the camera system.
3. The string for testing the television underground of the continuous oil pipe of the horizontal well according to claim 1 or 2, wherein the centralizer comprises a centralizer body, a supporting rod, a spring piece and a tension spring, the supporting rod is sleeved outside the centralizer body, the tension spring is sleeved outside the supporting rod, the lengths of the supporting rod and the spring piece exceed the length of the tension spring, two ends of the spring piece are fixed at two ends of the tension spring, the middle of the spring piece bulges outwards, and at least two spring pieces are uniformly distributed in the circumferential direction of the tension spring in the same way.
4. The horizontal well coiled tubing downhole television test string according to claim 1 or 2, wherein the lower end of the centralizer is connected with a downhole television test terminal in a plug-in mode, is fixed from the side by screws, and is provided with a sealing ring at the joint to realize sealing.
5. The horizontal well coiled tubing downhole television test string according to claim 1 or 2, wherein the upper end of the centralizer is connected with the lower end of the signal transmitter in a plug-in manner, is fixed from the side by screws, and is provided with a sealing ring at the joint to realize sealing.
6. The horizontal well coiled tubing downhole television test string according to claim 1 or 2, wherein the upper end of the signal transmitter is connected with the lower end of the headstock in a plug-in manner, the signal transmitter is fixed from the side by screws, and a sealing ring is installed at the joint to realize sealing.
7. The underground television testing method for the continuous oil pipe of the horizontal well is characterized in that the lower end of an optical fiber cable passes through the continuous oil pipe, then sequentially passes through a quick connector of the continuous oil pipe and a circulating well-flushing tool, and reaches the inside of a headstock to be connected with the optical fiber cable led out by a signal transmitter; when the optical fiber cable passes through the inside of the circulating well-flushing tool, each sealing rubber block is extruded and folded at the same time, so that the optical fiber cable is tightly held, well-flushing liquid is isolated from the space below the sealing rubber blocks, and the well-flushing liquid enters and exits from the circulating port on the side surface of the circulating well-flushing tool; meanwhile, the optical fiber cable penetrating through the continuous oil pipe passes through the centralizer while supplying power for normal operation of a circuit in the signal transmitter after the inner core of the optical fiber cable is connected to the signal transmitter, and supplies power for the illumination and camera system of the lower underground television test terminal; the underground television testing terminal can move along with the continuous oil pipe to test the underground arbitrary position and send and transmit the underground arbitrary position to the ground display instrument terminal for real-time imaging through the signal transmitter and the optical fiber cable; if the condition of blurring and incapability of being seen clearly occurs in the detection process, the ground equipment can be immediately started at any position to perform circulating well flushing, so that the detection is realized while the well flushing is performed, and the damage to a lower-end test instrument is avoided, thereby obtaining the overall high-quality detection effect of various inclined shafts;
the circulating well-flushing tool comprises a tool outer cylinder, a radial extrusion sealing device and an axial movement driving device, wherein the axial movement driving device and the radial extrusion sealing device are assembled in the tool outer cylinder, the axial movement driving device is connected to the lower end of the radial extrusion sealing device, the inner wall of the tool outer cylinder is provided with a conical surface inner bulge which forces the radial extrusion sealing device to radially shrink, and the tool outer cylinder is provided with a circulating port which is positioned above the conical surface inner bulge;
the radial extrusion sealing device comprises a split holding ring and sealing rubber blocks, wherein the upper end of the split holding ring is provided with at least three split, the lower end of the split holding ring is provided with a cylinder, the upper end of the outer wall of the split is also provided with a cone shape which is matched with the bulge in the conical surface of the outer cylinder of the tool, the sealing rubber blocks are vulcanized on each split of the split holding ring in a split manner, and the inner sides of the sealing rubber blocks are folded inwards to form circular through holes for the passage of optical fiber cables; the axial movement driving device further comprises an adjusting cylinder, the adjusting cylinder is connected to the lower end of the pushing cap, a symmetrical through hole is formed in the lower end of the adjusting cylinder in the radial direction, the pushing cap can be pushed by rotating the adjusting cylinder, the pushing cap drives the radial extrusion sealing device to move upwards, and the split holding ring is folded inwards along the inner conical surface of the tool outer cylinder.
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| CN112324425B (en) * | 2020-10-22 | 2023-07-14 | 东营杰开智能科技有限公司 | Coiled tubing layering test device and method |
| CN113338901B (en) * | 2021-06-07 | 2022-07-29 | 中海油田服务股份有限公司 | Testing system for instrument nipple and downhole instrument of lead |
| CN115614023B (en) * | 2022-12-16 | 2023-03-10 | 中国石油集团川庆钻探工程有限公司 | Underground visualization system for coiled tubing |
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