CN115370350A - Device and method for monitoring release of cable lower bridge plug and storage medium - Google Patents
Device and method for monitoring release of cable lower bridge plug and storage medium Download PDFInfo
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- CN115370350A CN115370350A CN202210966802.2A CN202210966802A CN115370350A CN 115370350 A CN115370350 A CN 115370350A CN 202210966802 A CN202210966802 A CN 202210966802A CN 115370350 A CN115370350 A CN 115370350A
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- bridge plug
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- cable
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims description 15
- 238000012806 monitoring device Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 5
- 239000003079 shale oil Substances 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention relates to the technical field of shale oil and gas well exploration, in particular to a device and a method for monitoring releasing of a cable under-well bridge plug and a storage medium, wherein the device comprises an underground bridge plug releasing monitoring tool and a ground control system for monitoring and controlling the work of the underground bridge plug releasing monitoring tool; the underground bridge plug release monitoring tool comprises a sensor module, an electronic switch module and a wiring assembly, wherein the sensor module is electrically connected with the electronic switch module, the wiring assembly is electrically connected with a ground control system, the sensor module and the electronic switch module are electrically connected with the wiring assembly, and the underground bridge plug release monitoring tool is arranged on a bridge plug setting pipe string. The invention directly collects the vibration at the operation pipe string, and judges the releasing in the underground without transmitting the vibration wave to the ground, and is not influenced by the depth of the well and the cable.
Description
Technical Field
The invention relates to the technical field of shale oil and gas well exploration, in particular to a device and a method for monitoring release of a cable under-entering bridge plug and a storage medium.
Background
In the completion process of a shale oil-gas well, a stratum oil-gas channel is strengthened by adopting a staged hydraulic fracturing mode, and before hydraulic fracturing, a bridge plug is generally set in a shaft and used for plugging a lower layer of an interval subjected to hydraulic fracturing; in order to improve the well completion efficiency, the bridge plug and the perforation are combined by adopting a cable transmission multi-stage ignition mode at present.
The bridge plug setting is realized by driving a piston cylinder of a setting tool to move by a large amount of gas generated by burning bridge plug gunpowder. When the bridge plug is set, the ground control system can only judge whether the ignition of the bridge plug igniter is successful or not through a current curve during ignition, and cannot judge whether the bridge plug at the bottom of the well is successfully released or not. In actual operation, ignition is successful, but accidents that the bridge plug is not released or even does not act are caused by abnormal combustion of bridge plug gunpowder and the like.
The pipe string shaking generated in the process from bridge plug setting to releasing is relatively small, especially under the condition that a plurality of kilometers of underground wells exist in a shaft, the shaking characteristics of the pipe string generated by bridge plug setting cannot be detected in a conventional perforation shaking vibration wave detection mode on the ground, so that whether the bridge plug releasing is successful or not cannot be directly judged on the ground, whether the bridge plug is successfully released or not is determined, and the method has important guiding significance for subsequent operation.
Therefore, a device, a method and a storage medium for monitoring the releasing of a cable-lowering bridge plug are needed to determine whether the operation of setting the bridge plug until the releasing is completed is successful.
Disclosure of Invention
The invention aims to provide a device and a method for monitoring release of a cable-lowering bridge plug, and a storage medium, which are used for judging whether the bridge plug setting release is successful or not in the cable transmission bridge plug setting operation so as to solve the challenge brought by a new operation mode which cannot be responded by the traditional scheme.
The embodiment of the invention is realized by the following technical scheme: a cable lower bridge plug release monitoring device comprises an underground bridge plug release monitoring tool and a ground control system for monitoring and controlling the operation of the underground bridge plug release monitoring tool;
the underground bridge plug release monitoring tool comprises a sensor module, an electronic switch module and a wiring assembly, wherein the sensor module is electrically connected with the electronic switch module, the wiring assembly is electrically connected with a ground control system, the sensor module and the electronic switch module are electrically connected with the wiring assembly, and the underground bridge plug release monitoring tool is arranged on a bridge plug setting pipe string.
According to a preferred embodiment, the sensor module comprises at least one small-range sensor and one large-range sensor.
According to a preferred embodiment, the downhole bridge plug release monitoring tool further comprises a housing, and the sensor module and the electronic switch module are both arranged in the housing.
According to a preferred embodiment, a plug screw is threadedly connected to the rear portion of the housing, and the wiring assembly is disposed through the plug screw at the rear portion of the housing.
According to a preferred embodiment, the downhole bridge plug release monitoring tool further comprises a sealing connector, and the head of the sensor module and the tail of the electronic switch module are respectively provided with one sealing connector.
According to a preferred embodiment, the tail of the sensor module is provided with a sensor module positioning plug, and the tail of the electronic switch module is provided with an electronic switch module positioning plug.
According to a preferred embodiment, the electronic switch module is arranged in the sensor module positioning plug, and the screw plug and the sealing connector arranged at the tail part of the electronic switch module are arranged in the electronic switch module positioning plug.
According to a preferred embodiment, the head and the tail of the housing are each provided with a thread along their circumference.
The invention also provides a cable lower bridge plug release monitoring method, which is used for the device and comprises the following steps:
in the bridge plug setting process, acquiring vibration data of the underground bridge launching connection pipe string;
drawing a vibration curve corresponding to vibration of the underground bridge-shoot linkage pipe string based on the vibration data;
and calculating the similarity between the vibration curve and the standard curve, if the similarity is smaller than a similarity threshold value, determining bridge plug releasing information, and reporting the bridge plug releasing information to a ground control system.
The invention also provides a computer-readable storage medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the method as described above.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects: according to the invention, in the cable transmission bridge plug operation process, the bridge plug setting can be accurately judged through the acquired data until the final bridge plug release is smooth, whether the bridge plug release is successful can be accurately judged, and a reliable basis is provided for subsequent successful operation; after the method is adopted, in the process of cable transmission bridge plug perforation combined operation, vibration data of the pipe string during subsequent perforation operation can be detected and used for accurately judging whether the perforation operation is successful or not, personnel for touching the cable at a well mouth in a traditional mode are not needed, personnel at dangerous posts are effectively reduced, and safety of a well site is greatly improved; the invention directly collects the vibration of the operation pipe string, judges the releasing in the underground without transmitting the vibration wave to the ground and is not influenced by the depth of the well and the cable.
Drawings
FIG. 1 is a schematic structural diagram of a bridge plug release monitoring device provided by the present invention;
FIG. 2 is a typical shock curve for a string of pipe when a bridge plug is normally set until the time of a release;
FIG. 3 is a typical shock curve for a string at normal perforation;
icon: the sensor comprises a shell 1, a retainer ring 2, a sealing connector 3, a sensor module 4, a sensor positioning plug 5, an electronic switch module 6, an electronic switch module positioning plug 7, a sealing ring 8, a screw plug 9 and a wiring assembly 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of a bridge plug release monitoring device according to an embodiment of the present invention.
The bridge plug release monitoring device provided by the invention comprises two parts, namely hardware and software, wherein the hardware part comprises a downhole bridge plug release monitoring tool and a ground control system for monitoring and controlling the operation of the downhole bridge plug release monitoring tool, and the downhole bridge plug release monitoring tool is arranged on a bridge plug setting pipe string.
Specifically, the downhole bridge plug release monitoring tool comprises a sensor module, an electronic switch module and a wiring assembly, wherein the sensor module is electrically connected with the electronic switch module; when the bridge plug is set, the vibration of the pipe string is small, a small-range sensor is used for collecting the vibration data of the pipe string, the data collection precision is high, and the work is reliable; the pipe string vibrates greatly during perforation, the large-range sensor is used for collecting vibration data, the small-range sensor is not electrified, the shock resistance of the small-range sensor is effectively improved, and the repeated service life and the monitoring precision of the device are guaranteed.
It can be understood that the invention can accurately judge whether the bridge plug setting is successful until the final bridge plug releasing operation is successful through the collected data in the cable transmission bridge plug operation process, thereby providing reliable basis for the subsequent successful operation; after the method is adopted, in the process of cable transmission bridge plug perforation combined operation, vibration data of the pipe string in the subsequent perforation operation can be detected and used for accurately judging whether the perforation operation is successful or not, personnel who touch the cable at a well head in a traditional mode are not needed, personnel at dangerous posts are effectively reduced, and the safety of a well site is greatly improved; the invention directly collects the vibration at the operation pipe string and judges the releasing in the underground without transmitting the vibration wave to the ground, and is not influenced by the depth of the well and the cable.
Further, in an implementation manner of this embodiment, the device and the multi-stage perforation control system belong to a parallel connection relationship, and the electronic switch module is provided with a built-in control circuit for cutting off the line connection between the device and the entire multi-stage perforation control system when the device circuit fails, so that the subsequent operation of the multi-stage perforation control system can be normally performed, and the reliability of the multi-stage perforation control system is ensured.
The wiring assembly is electrically connected with the ground control system and used for transmitting information about whether bridge plug setting is successful or not to the ground control system through a cable, and the sensor module and the electronic switch module are electrically connected with the wiring assembly.
The software part of the embodiment of the invention comprises a data acquisition, storage and data processing program arranged in a sensor module and a control program integrated in a ground control system, the software part of the embodiment of the invention is integrated in a multi-stage perforation control system, under the condition of starting the monitoring function of the underground bridge plug releasing monitoring tool, when the multi-stage perforation control system carries out self-detection on each module, whether the underground bridge plug releasing monitoring tool is normally on-line or not is automatically detected, and when the underground bridge plug releasing monitoring tool is not started, the system defaults to not install the underground bridge plug releasing monitoring tool, and at the moment, even if the device is connected in a pipe string, the subsequent operation of the system is not influenced.
Under the condition that the monitoring function of the device is started, after the ignition instruction is started by the multi-stage perforation control system, the sensor module is electrified to start data acquisition until the ignition is finished, and the sensor module stops acquisition work; the data collected by the sensor module are directly stored in a storage module arranged in the sensor module. Further, an internal program of a microprocessor arranged in the sensor module processes data and is used for processing and analyzing the received vibration data, similarity between a vibration curve and a standard curve is calculated, if the similarity is smaller than a similarity threshold value, bridge plug releasing information is determined, the bridge plug releasing information is reported to a ground control system through cable communication and is filed in a log file of the ground control system; and synchronously displaying the data curve of the bridge plug releasing information on a ground control interface as a judgment basis for ground workers to judge whether follow-up operation can be normally carried out, and if the detailed vibration data curve needs to be read, manually operating the data curve to read from a memory of the underground tool and transmitting the data curve to a ground control system.
In an embodiment of this embodiment, the storage module built in the sensor module may store 100 times of monitoring data, and perform cyclic coverage when the data overflows, and the stored data may be accessed to the multi-stage perforation control system to perform data reading, and may store 100 times of monitoring data is a preferred embodiment, and is not limited specifically here.
Example 2
Different from embodiment 1, this implementation provides the monitoring tool that gives up of bridge plug still includes the casing in the casing is all placed in to sensor module, electronic switch module, effectively protects inside sensor module and electronic switch module through the casing, prevents that the vibrations of bridge plug setting pipe cluster from damaging inside subassembly.
In order to further improve the shock resistance of the device, in an implementation manner of this embodiment, a sensor module positioning plug is disposed at the tail of the sensor module, and an electronic switch module positioning plug is disposed at the tail of the electronic switch module; the sensor module positioning plug and the electronic switch module positioning plug are used for improving the damping performance of the sensor module and the electronic switch module through positioning the sensor module and the electronic switch module. In this embodiment, the impact resistance of the apparatus is further improved by potting the resin in each module connection slit.
Furthermore, considering the presence of water in a few kilometers of the well, it is also necessary to ensure the sealing performance of the device; specifically, in an implementation manner of this embodiment, the downhole bridge plug releasing monitoring tool further includes a sealing connector, where the head of the sensor module and the tail of the electronic switch module are respectively provided with one sealing connector, and the sealing connectors are fixed to the housing through retaining rings. The electronic switch module is arranged in the sensor module positioning plug, the screw plug and the sealing connector arranged at the tail part of the electronic switch module are arranged in the electronic switch module positioning plug. The plug screw thread is connected with the tail of the shell, and the wiring assembly penetrates through the plug screw and is arranged at the tail of the shell.
In this embodiment, the head and the afterbody of casing all are equipped with the sealing washer along its circumference, through sealing washer realize the device with the bridging plug sit the zonulae occludens of sealing a string, guarantee the precision of vibrations data acquisition.
The embodiment of the invention also provides a cable lower bridge plug release monitoring method, which is used for the device and comprises the following steps:
in the bridge plug setting process, acquiring vibration data of the underground bridge launching connection pipe string; drawing a vibration curve corresponding to vibration of the underground bridge-shooting linkage pipe string based on the vibration data; and calculating the similarity between the vibration curve and the standard curve, if the similarity is smaller than a similarity threshold value, determining bridge plug releasing information, and reporting the bridge plug releasing information to a ground control system.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method for monitoring a cable drop-in bridge plug release is implemented.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cable lower bridge plug release monitoring device is characterized by comprising an underground bridge plug release monitoring tool and a ground control system for monitoring and controlling the operation of the underground bridge plug release monitoring tool;
the underground bridge plug releasing monitoring tool comprises a sensor module, an electronic switch module and a wiring assembly, wherein the sensor module is electrically connected with the electronic switch module, the wiring assembly is electrically connected with a ground control system, the sensor module and the electronic switch module are electrically connected with the wiring assembly, and the underground bridge plug releasing monitoring tool is arranged on a bridge plug setting pipe string.
2. The cable underbridge plug release monitoring device of claim 1, wherein the sensor module comprises at least one small range sensor and one large range sensor.
3. The cable trip bridge plug release monitoring device of claim 1, wherein the downhole bridge plug release monitoring tool further comprises a housing, and the sensor module and the electronic switch module are both embedded in the housing.
4. The cable underbridge plug release monitoring device of claim 3, wherein a plug screw is threadedly connected to the rear portion of the housing, and the wiring assembly is disposed through the plug screw at the rear portion of the housing.
5. The cable trip bridge plug release monitoring device of claim 4, wherein the downhole bridge plug release monitoring tool further comprises a sealing connector, one for each of the head of the sensor module and the tail of the electronic switch module.
6. The cable underbridge plug release monitoring device according to claim 5, wherein a sensor module positioning plug is disposed at a tail portion of the sensor module, and an electronic switch module positioning plug is disposed at a tail portion of the electronic switch module.
7. The cable underbridge plug release monitoring device of claim 6, wherein the electronic switch module is embedded in the sensor module positioning plug, and the plug screw and the sealing connector disposed at the tail of the electronic switch module are both embedded in the electronic switch module positioning plug.
8. The cable underbridge plug release monitoring device of any one of claims 3 to 7, wherein the head and the tail of the housing are each threaded along their circumference.
9. A cable drop-in bridge plug release monitoring method applied to the device of any one of claims 1 to 8, comprising the steps of:
in the bridge plug setting process, acquiring vibration data of the underground bridge launching connection pipe string;
drawing a vibration curve corresponding to vibration of the underground bridge-shooting linkage pipe string based on the vibration data;
and calculating the similarity between the vibration curve and the standard curve, if the similarity is smaller than a similarity threshold value, determining bridge plug releasing information, and reporting the bridge plug releasing information to a ground control system.
10. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, implements the cable drop bridge plug release monitoring method of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210966802.2A CN115370350A (en) | 2022-08-11 | 2022-08-11 | Device and method for monitoring release of cable lower bridge plug and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210966802.2A CN115370350A (en) | 2022-08-11 | 2022-08-11 | Device and method for monitoring release of cable lower bridge plug and storage medium |
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| CN115370350A true CN115370350A (en) | 2022-11-22 |
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| CN202210966802.2A Pending CN115370350A (en) | 2022-08-11 | 2022-08-11 | Device and method for monitoring release of cable lower bridge plug and storage medium |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040244475A1 (en) * | 2003-06-03 | 2004-12-09 | Butler Thomas L. | Pressure monitoring technique and applications involving wells |
| CN203066956U (en) * | 2013-01-15 | 2013-07-17 | 西安物华巨能***器材有限责任公司 | Oil and gas well perforating ground monitoring device |
| US20160258270A1 (en) * | 2015-03-05 | 2016-09-08 | Impact Selector International, Llc | Impact Sensing During Jarring Operations |
| US20170030186A1 (en) * | 2013-12-31 | 2017-02-02 | Halliburton Energy Services, Inc. | Fast Test Application for Shock Sensing Subassemblies Using Shock Modeling Software |
| CN109564296A (en) * | 2016-07-01 | 2019-04-02 | 斯伦贝谢技术有限公司 | The method and system of object in well for detecting reflection hydraulic pressure signal |
| US20210215023A1 (en) * | 2017-04-19 | 2021-07-15 | Halliburton Energy Services, Inc. | System, Method, and Device for Monitoring a Parameter Hole |
| CN213775356U (en) * | 2020-09-04 | 2021-07-23 | 方永和 | Borehole operation construction monitor |
-
2022
- 2022-08-11 CN CN202210966802.2A patent/CN115370350A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040244475A1 (en) * | 2003-06-03 | 2004-12-09 | Butler Thomas L. | Pressure monitoring technique and applications involving wells |
| CN203066956U (en) * | 2013-01-15 | 2013-07-17 | 西安物华巨能***器材有限责任公司 | Oil and gas well perforating ground monitoring device |
| US20170030186A1 (en) * | 2013-12-31 | 2017-02-02 | Halliburton Energy Services, Inc. | Fast Test Application for Shock Sensing Subassemblies Using Shock Modeling Software |
| US20160258270A1 (en) * | 2015-03-05 | 2016-09-08 | Impact Selector International, Llc | Impact Sensing During Jarring Operations |
| CN109564296A (en) * | 2016-07-01 | 2019-04-02 | 斯伦贝谢技术有限公司 | The method and system of object in well for detecting reflection hydraulic pressure signal |
| US20210215023A1 (en) * | 2017-04-19 | 2021-07-15 | Halliburton Energy Services, Inc. | System, Method, and Device for Monitoring a Parameter Hole |
| CN213775356U (en) * | 2020-09-04 | 2021-07-23 | 方永和 | Borehole operation construction monitor |
Non-Patent Citations (1)
| Title |
|---|
| 许得禄等: "MaHW6004井泵送桥塞射孔联作复杂情况处理", 石油钻采工艺, no. 03, 20 May 2018 (2018-05-20), pages 306 - 309 * |
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