CN210666050U - Device and system for detecting damage information of sleeve - Google Patents
Device and system for detecting damage information of sleeve Download PDFInfo
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- CN210666050U CN210666050U CN201921580018.8U CN201921580018U CN210666050U CN 210666050 U CN210666050 U CN 210666050U CN 201921580018 U CN201921580018 U CN 201921580018U CN 210666050 U CN210666050 U CN 210666050U
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Abstract
The embodiment of the utility model discloses a device and a system for detecting damage information of a casing, wherein the casing is a vertical casing for an oil production well, and the device is lowered into the casing for detection; the device comprises: a main detection unit configured to detect a portion of the casing radially corresponding to the main detection unit; the upper centralizer and the lower centralizer are respectively positioned at two ends of the main detection unit; a pre-detection unit configured to detect a portion of the casing radially corresponding to the pre-detection unit, the pre-detection unit being disposed in front of the lower centralizer in a direction in which the apparatus is lowered such that the pre-detection unit is able to protrude into a space between the obstacle and an inner wall of the casing or to come into contact with the bottom hole, respectively, when the apparatus is blocked by the lower centralizer by an obstacle protruding radially inward into the casing or cannot be lowered further by being lowered to the bottom hole.
Description
Technical Field
The utility model relates to an oil recovery sleeve pipe field of detecting a flaw especially relates to a survey sheathed tube damage information's device and system.
Background
In recent years, most of production oil wells in China enter the middle and later periods of exploitation in succession, the conditions in the wells are complex, and the fault detection devices are more and more frequently blocked in the exploration, development and oil extraction processes. In the geophysical logging process, because the damage of the oil production casing greatly affects the safety in an oil well and the oil and gas production, the damage condition of a blocked part needs to be detected so as to determine the current situation that the casing damages the oil well, take remedial measures and further carry out large-scale logging monitoring.
The detection device can detect damage information of the casing by using a transient electromagnetic method. The physical basis of the transient electromagnetic method is Faraday's law of electromagnetic induction, bipolar step signals or oblique step signals are applied to a transmitting coil, a receiving coil is used for observing a secondary eddy current field at the turn-off interval of a primary pulse magnetic field, and the change rule of the secondary field at each time point along with time after power failure is measured, so that the earth electric characteristics of different underground depths can be obtained. In the underground detection process, the conductivity of metals such as the casing is far greater than that of air, a cement sheath and a stratum, so that the damage abnormal condition of the underground casing can be inverted according to the induced electromotive force received by the receiving coil.
However, the existing detection device cannot detect the specific situation of casing damage information at the position of the blockage under the condition that the device is blocked, so that subsequent logging work is difficult to carry out, judgment and analysis are needed from all aspects, not only is the workload increased, but also the judgment accuracy cannot be ensured, and the logging work is complex.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a it is expected to provide a detect device and system of sheathed tube damage information can directly detect the damage information that meets the department of hindering for can in time take to supply to ask the measure to reduce the influence that the sleeve pipe damage led to the fact oil well safety and oil gas exploitation, and facilitate for follow-up logging work.
The technical scheme of the utility model is realized like this:
in a first aspect, the embodiment of the present invention provides a device for detecting damage information of casing, wherein, the casing is vertical casing for oil production well, the device is transferred in order to survey, its characterized in that, the device includes:
a main detection unit configured to detect a portion of the casing radially corresponding to the main detection unit;
the upper centralizer and the lower centralizer are respectively positioned at two ends of the main detection unit;
a pre-detection unit configured to detect a portion of the casing radially corresponding to the pre-detection unit, the pre-detection unit being disposed in front of the lower centralizer in a direction in which the apparatus is lowered such that the pre-detection unit is able to protrude into a space between the obstacle and an inner wall of the casing or to come into contact with the bottom hole, respectively, when the apparatus is blocked by the lower centralizer by an obstacle protruding radially inward into the casing or cannot be lowered further by being lowered to the bottom hole.
In a second aspect, an embodiment of the present invention provides a system for detecting damage information of a casing, the system includes:
the apparatus of the first aspect;
a logging winch comprising a single core cable for lowering the device into the casing;
and the upper computer is configured to store, process and image and display the damage information detected by the device.
The embodiment of the utility model provides a device and a system for detecting damage information of a sleeve; the front detection unit is arranged below the lower centralizer, so that the front detection unit can directly detect damage information of a position which meets a resistance under the condition that the device meets the resistance due to the lower centralizer; the utility model discloses technical scheme is to causing to meet the damage degree of hindering problem reason general investigation, evaluation oil sleeve pipe, in time take measures, implement further sleeve pipe and survey and all have important meaning.
Drawings
Fig. 1 is a schematic diagram of a device for detecting damage information of a casing according to an embodiment of the present invention, which is encountered by an obstacle protruding radially inward into the casing;
fig. 2 is a schematic diagram of a device for detecting damage information of a casing pipe according to an embodiment of the present invention encountering a blockage at a well bottom;
fig. 3 is a schematic structural diagram of an apparatus for detecting damage information of a casing according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a front detection unit of an apparatus for detecting damage information of a casing according to an embodiment of the present invention;
fig. 5 is a schematic layout view of a plurality of main probes of a main detection unit of an apparatus for detecting damage information of a casing according to an embodiment of the present invention;
fig. 6 is a schematic layout diagram of a single front probe of a front detection unit of an apparatus for detecting damage information of a casing according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a system for detecting damage information of a casing according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1, which shows an apparatus 100 for detecting damage information of a casing SL according to an embodiment of the present invention, wherein the casing SL is a vertical casing for a production well, and is surrounded by a cement sheath and a formation from inside to outside in a horizontal direction, as shown in fig. 1, the apparatus 100 is lowered into the casing SL for detection by means of a single-core cable SC (described below), and wherein the apparatus 100 is obstructed by an obstacle BA protruding radially inward into the casing SL, the apparatus 100 may include:
a main detection unit 110 configured to detect a portion P1 of the casing SL radially corresponding to the main detection unit 110;
the upper centralizer 130 and the lower centralizer 140 are respectively positioned at two ends of the main detection unit 110, and the upper centralizer 130 and the lower centralizer 140 are used for keeping the device 100 at the position of the longitudinal axis of the casing SL all the time in the detection process, so that the device 100 is prevented from shaking in the casing SL to generate measurement errors;
a pre-detection unit 120 configured to detect a portion P2 of the casing SL radially corresponding to the pre-detection unit 120, the pre-detection unit 120 being disposed in front of the lower centralizer 140 in a direction in which the apparatus 100 is lowered.
In the example shown in fig. 1, the device 100 cannot be lowered further because the lower centralizer 140 is blocked by an obstacle BA projecting radially inwards into the casing SL, while the radial dimension of the pre-detection unit 120 is smaller than the radial dimension of the lower centralizer 140, the pre-detection unit 120 being able to protrude into the space SP between the obstacle BA and the inner wall of the casing SL, thereby detecting the portion P2 of the casing SL.
In the example shown in fig. 2, the device 100 cannot be lowered further because it is lowered to the bottom of the well, and at this time, the front detection unit 120 can contact with the bottom of the well, so that the portion of the casing SL at the bottom of the well can be detected by the front detection unit 120.
The embodiment of the utility model provides a detect sheathed tube damage information's device can directly detect the device and meet the sleeve pipe damage information of hindering the department, consequently can confirm the current situation of sleeve pipe damage oil well and in time take to supply to ask the measure to reduce the influence that the sleeve pipe damage caused oil well safety and oil gas exploitation to facilitate for follow-up logging work.
With respect to the device 100, in a preferred embodiment of the present invention, referring to fig. 3, the device 100 may further comprise a faucets 150, the faucets 150 being located above the upper centralizer 130 and being used to connect the device 100 to the single-core cable SC shown in fig. 1, the faucets 150 preferably being waterproof and pressure resistant.
As for the main detection unit 110, in a preferred embodiment of the present invention, referring to fig. 3, the main detection unit 110 may include: the downhole power supply module 111 is used for providing electric energy required by the detection operation of the device 100, wherein the downhole power supply module 111 consists of a DC-DC power supply module and a plurality of integrated voltage-stabilizing tubes, required voltage is provided for a downhole circuit through a power supply bus of the device 100, and excitation current cannot exceed a rated value; a cable drive module 112, the cable drive module 112 uploading the probe signal to the surface by coupling the probe signal to a five-core cable CA (shown in fig. 5); and a plurality of main probes MP, each of the plurality of main probes MP may include a transmitting coil and a receiving coil, and may adopt a transmitting-receiving integrated winding manner in which the transmitting coil is at an inner layer and the receiving coil is at an outer layer, thereby effectively shortening the length of the main detecting unit 110, further shortening the overall length of the device 100, and simultaneously improving the sensitivity of receiving signals, and by increasing the number of winding turns of the receiving coil, also improving the strength of receiving response signals, so that the detection result is more obvious. By applying a bipolar step signal or a ramp step signal to the transmitting coil, a secondary field induced electromotive force which exponentially decays along with time change can be generated in the receiving coil, and the decay rule mainly depends on the conductivity and the volume scale of the surrounding medium. The single chip microcomputer is adopted to collect the induced electromotive force of the receiving coil, and the test signals are jointly interpreted, so that the conductivity information of the underground medium can be inverted.
To the front detecting unit 120, in the preferred embodiment of the present invention, referring to fig. 4, the front detecting unit 120 may include a single front probe AP, the single front probe AP may include a transmitting coil and a receiving coil, and may adopt a transmitting coil and a receiving coil to receive and transmit the signal at an inner layer receiving coil, thereby effectively shortening the length of the front detecting unit 120, and further shortening the overall length of the device 100, and at the same time, the sensitivity of the received signal may be improved, and the strength of the received response signal may also be improved by increasing the number of winding turns of the receiving coil, so that the detection result is more obvious. The working principle of the front probe AP is similar to that of the plurality of main probes MP, and will not be described herein.
As for the front detection unit 120, in a preferred embodiment of the present invention, referring to fig. 4, the front detection unit 120 may include a pressure-bearing joint 121, and the front detection unit 120 is connected to the lower centralizer 140 through the pressure-bearing joint 121. The connection through the pressure-bearing joint 121 enables the stability of the device 100 to be better and the quality to be guaranteed.
For the front probe AP, in a preferred embodiment of the present invention (not shown in the figure), the front probe AP may be powered by a pressure-bearing sealing needle. In the case of using a pressure-bearing sealing needle, the front-end detection unit 120 may not be provided with a circuit to supply power to the front-end probe AP, so that the size of the front-end detection unit 120 may be reduced, and the device 100 may not have a great influence on centering of the device in the case of being not vertically symmetrical.
In a preferred embodiment of the present invention, as shown in fig. 4, the connection between the pressure-bearing joint 121 and the lower centralizer 140 can be sealed by a sealing plug SP to prevent liquid from flowing in and damaging the apparatus 100.
As for the lower centralizer 140, in a preferred embodiment of the present invention, referring to fig. 4, the lower centralizer 140 may be hollow such that the five-core cable CA can be connected to the front detection unit 120 through the lower centralizer 140. Specifically, as shown in fig. 5, the five-core cable CA is connected to the front probe AP of the front probe unit 120 through the lower centralizer 140 so that a probe signal of the front probe AP can be coupled to the five-core cable CA.
As for the plurality of main probes MP, preferably, as shown in fig. 5, the plurality of main probes MP may be uniformly arranged in the circumferential direction of the main probe unit 110 so as to jointly divide the downhole circumferential direction 360 degrees equally into different detection regions, and the plurality of main probes MP may be arranged sequentially in the longitudinal direction of the main probe unit 110. Taking fig. 5 as an example, the main probe unit 110 includes four main probes MP1-MP4, the four main probes MP1-MP4 are uniformly arranged in the circumferential direction of the main probe unit 110, and the four main probes MP1-MP4 are sequentially arranged in the longitudinal direction of the main probe unit 110.
For the single front probe AP, preferably, as shown in fig. 6, the single front probe AP may be centrally arranged in the front probe unit 120.
The detection performance of the two arrangements of single probe centering and eccentricity is compared as follows: when a centered probe (probe AP) is used, as shown in fig. 6, the detection performance in all directions around the well is the same, and the detection range in all directions is also the same; when an eccentric probe is adopted, the proportion of the information of the biased direction in the detection information is large, the detection performance of the probe on the biased direction is strong, the detection range is large, the detection performance of the probe on the biased reverse direction is poor, and the test signal-to-noise ratio is low. In this embodiment, not only the performance and detection range of the signal measured by the probe need to be considered, but also the bearing problem below the lower centralizer 140 should be further considered. In order to achieve the best detection effect of the front detecting unit 120 and ensure the best performance and stability of the instrument, it is the best choice for the front detecting unit 120 to adopt a centered probe.
Referring to fig. 7, the embodiment of the present invention further provides a system 10 for detecting damage information of a casing SL, where the system 10 includes:
the apparatus 100 according to embodiments of the present invention;
a logging winch 200, said logging winch 200 comprising a monocable SC for lowering the device 100 into the casing SL;
and the upper computer 300 is configured to store, process and image and display the damage information detected by the device 100.
In the preferred embodiment of the present invention, referring to fig. 7, the damage information data detected by the device 100 is uploaded to the upper computer 300 through the single core cable SC.
It should be noted that: the embodiment of the utility model provides an between the technical scheme who records, under the condition of conflict, can make up wantonly.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An apparatus for detecting damage information of a casing, wherein the casing is a vertical casing for a production well, and the apparatus is lowered into the casing for detection, the apparatus comprising:
a main detection unit configured to detect a portion of the casing radially corresponding to the main detection unit;
the upper centralizer and the lower centralizer are respectively positioned at two ends of the main detection unit;
a pre-detection unit configured to detect a portion of the casing radially corresponding to the pre-detection unit, the pre-detection unit being disposed in front of the lower centralizer in a direction in which the apparatus is lowered such that the pre-detection unit is able to protrude into a space between the obstacle and an inner wall of the casing or to come into contact with the bottom hole, respectively, when the apparatus is blocked by the lower centralizer by an obstacle protruding radially inward into the casing or cannot be lowered further by being lowered to the bottom hole.
2. The apparatus of claim 1, wherein the front probe unit comprises a single front probe centrally disposed therein.
3. The apparatus of claim 2, wherein the front probe is powered by a pressurized sealing needle.
4. The apparatus of claim 1, wherein the lead detection unit comprises a pressure-bearing joint for connecting the lead detection unit to the lower centralizer.
5. The apparatus of claim 4, wherein the connection between the pressure-bearing joint and the lower centralizer is sealed by a sealing plug.
6. The apparatus of claim 1, further comprising a faucets located above the upper centralizer, the faucets for connecting the apparatus to a single conductor cable through which the apparatus is lowered into the casing.
7. The apparatus of claim 1, wherein the main detection unit comprises:
a plurality of main probes uniformly arranged in a circumferential direction of the main probe unit and sequentially arranged in a longitudinal direction of the main probe unit;
a downhole power module configured to provide electrical energy required for the device to perform a probing operation;
a cable drive module configured to upload damage information detected by the device to the surface.
8. The device of claim 2 or 7, wherein the probe comprises a transmitting coil and a receiving coil, and the probe adopts a transmitting-receiving integrated winding mode that the transmitting coil is arranged on the inner layer and the receiving coil is arranged on the outer layer.
9. A system for detecting damage information of a casing, the system comprising:
the device of any one of claims 1 to 8;
a logging winch comprising a single core cable for lowering the device into the casing;
and the upper computer is configured to store, process and image and display the damage information detected by the device.
10. The system of claim 9, wherein the damage information data detected by the device is uploaded to the host computer through the single core cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921580018.8U CN210666050U (en) | 2019-09-20 | 2019-09-20 | Device and system for detecting damage information of sleeve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921580018.8U CN210666050U (en) | 2019-09-20 | 2019-09-20 | Device and system for detecting damage information of sleeve |
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| CN210666050U true CN210666050U (en) | 2020-06-02 |
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| CN201921580018.8U Active CN210666050U (en) | 2019-09-20 | 2019-09-20 | Device and system for detecting damage information of sleeve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542930A (en) * | 2019-09-20 | 2019-12-06 | 西安石油大学 | Device and system for detecting damage information of sleeve |
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- 2019-09-20 CN CN201921580018.8U patent/CN210666050U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542930A (en) * | 2019-09-20 | 2019-12-06 | 西安石油大学 | Device and system for detecting damage information of sleeve |
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