CN108180014B - Monitoring device and method for well bottom information - Google Patents
Monitoring device and method for well bottom information Download PDFInfo
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- CN108180014B CN108180014B CN201810111426.2A CN201810111426A CN108180014B CN 108180014 B CN108180014 B CN 108180014B CN 201810111426 A CN201810111426 A CN 201810111426A CN 108180014 B CN108180014 B CN 108180014B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012806 monitoring device Methods 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 54
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 16
- 239000002904 solvent Substances 0.000 claims description 15
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 8
- 239000003566 sealing material Substances 0.000 description 7
- 239000007769 metal material Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000002407 reforming Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a device and a method for monitoring well bottom information, and belongs to the technical field of reservoir reformation. The monitoring device includes: the downhole tool comprises a dissolvable casing, an adhesive module, a power module, an information acquisition module, a data processor, a memory and a data transmission module. The invention bonds and wraps the power module, the information acquisition module, the data processor, the memory and the data transmission module through the bonding module, and wraps the dissolvable shell on the outer layer of the bonding module. When the downhole tool is located downhole, downhole information transmitted along the first pressure guiding hole and the second pressure guiding hole is detected through the information acquisition module and stored in the memory. After the reservoir is reformed, when the downhole tool with the soluble shell is located on the ground, the ground storage equipment obtains the well bottom information stored in the memory through the data transmission module, so that the influence of fracturing pipe columns is avoided, and the reservoir is reformed in a large scale with large discharge capacity.
Description
Technical Field
The invention relates to the technical field of reservoir reformation, in particular to a device and a method for monitoring well bottom information.
Background
In the process of exploiting a reservoir through an oil and gas well, in order to improve the exploitation efficiency and the recovery ratio of the reservoir, after perforation operation is completed on the oil and gas well, the reservoir can be reformed based on perforation holes so as to increase the migration channel of oil and gas in the reservoir. In the process of carrying out transformation on a reservoir, a fracturing string at the wellhead of the oil and gas well is injected in a high-pressure and large-displacement mode, high-viscosity fracturing fluid is squeezed into natural cracks of the reservoir through a shaft and perforation holes of the oil and gas well, the natural cracks are expanded through the fracturing fluid, and brittle rocks in the reservoir are sheared and slipped simultaneously, so that transformation on the reservoir is realized.
Because the bottom hole information corresponding to the reservoir has important guiding significance for optimizing the later-stage reconstruction design of the reservoir, explaining and fitting the artificial fracture length, predicting the permeability of the reservoir and evaluating the reconstruction effect of the reservoir, the bottom hole information corresponding to the reservoir can be obtained in the reconstruction process of the reservoir. In the related art, after setting and perforating are completed on an oil and gas well through a bridge plug and a perforating gun respectively, a fracturing string with a sensor arranged at the lower end is put into the oil and gas well to a perforation hole, so that in the process of reforming a reservoir corresponding to the oil and gas well based on the fracturing string, the bottom hole information corresponding to the reservoir is monitored through the sensor. After the reservoir fracturing is completed, the fracturing string is lifted to a wellhead, so that the reading of well bottom information is realized.
However, when the well bottom information corresponding to the reservoir is acquired, the fracturing string is required to be put into the oil and gas well, so that the pumping-in displacement, pumping-in pressure and other construction parameters in the reservoir transformation process are limited, and the method is not suitable for being applied to large-scale and large-displacement reservoir transformation.
Disclosure of Invention
The invention provides a device and a method for monitoring well bottom information, which aim to solve the problem that the transformation efficiency of large-scale and large-displacement reservoir transformation is reduced due to the limitation of the pipe diameter of a fracturing pipe column in the reservoir transformation process. The technical scheme is as follows:
In a first aspect, there is provided a monitoring device for downhole information, the monitoring device comprising: a downhole tool and a surface storage device, the downhole tool comprising a dissolvable casing, an adhesive module, a power module, an information acquisition module, a data processor, a memory, and a data transmission module;
the bonding module is used for bonding and wrapping the power module, the information acquisition module, the data processor, the memory and the data transmission module, the dissolvable shell is wrapped outside the bonding module and can be dissolved through a specified solvent, a first pressure guide hole is formed in the bonding module, a second pressure guide hole is formed in the dissolvable shell, and the second pressure guide hole is communicated with a detection end of the information acquisition module through the first pressure guide hole so as to detect downhole information;
The power module is respectively and electrically connected with the information acquisition module, the data processor, the memory and the data transmission module, the information acquisition module is electrically connected with the data processor, the data processor is electrically connected with the memory, and the memory is electrically connected with the data transmission module so as to process the well bottom information detected by the information acquisition module through the data processor and then store the processed well bottom information into the memory;
When the downhole tool dissolving the dissolvable casing is located at the surface, the surface storage device is connected with the data transmission module to obtain downhole information stored in the memory through the data transmission module.
Optionally, the soluble shell is an aluminum-magnesium alloy shell, and the specified solvent is flowback liquid containing magnesium ions and chloride ions in an oil-gas well.
Optionally, seals are disposed in the first pressure guiding hole and the second pressure guiding hole, and the seals have ventilation characteristics and are used for preventing the first pressure guiding hole and the second pressure guiding hole from being blocked.
Optionally, the bonding module is provided with a pressure guiding groove, the dissolvable shell is provided with at least one second pressure guiding hole, and at least one second pressure guiding hole is respectively communicated with the first pressure guiding hole through the pressure guiding groove.
Optionally, the at least one second pressure guiding hole is uniformly distributed on the outer surface of the dissolvable shell.
Optionally, the seal is disposed in the pressure guiding groove, and the seal is used for preventing the pressure guiding groove from being blocked.
Optionally, a charging interface is disposed on the adhesion module, and the charging interface is electrically connected with the power module, and is used for charging the power module.
Optionally, the adhesive module and the dissolvable shell are both spherical structures.
Optionally, the data transmission module is an RS232 data interface or an RS484 interface.
Optionally, the information acquisition module includes a pressure sensor and a temperature sensor.
In a second aspect, there is provided a method of monitoring downhole information during a reservoir intervention, the method comprising:
Detecting well bottom information based on the information acquisition module when the downhole tool is located at a preset position in the reservoir reconstruction process;
processing the well bottom information detected by the information acquisition module through the data processor and storing the well bottom information in the memory;
The surface storage device obtains downhole information stored by the memory via the data transmission module while the downhole tool having the dissolvable casing dissolved by the specified solvent is at the surface.
The technical scheme provided by the invention has the beneficial effects that: according to the invention, the downhole tool is put into the shaft of the oil-gas well, and then the fracturing fluid is injected into the corresponding reservoir along the casing pipe of the oil-gas well in a high-pressure large-displacement mode, so that the reservoir is reformed. In the transformation process of the reservoir, the power module respectively provides power for the information acquisition module, the data processor, the memory and the data transmission module, so that the information acquisition module can detect the bottom hole information corresponding to the reservoir in real time along the first pressure guide hole and the second pressure guide hole, and the information acquisition module can process the detected bottom hole information through the data processor after acquiring the bottom hole information, so that the memory can be stored and disposed. After the reservoir is reformed, when the downhole tool dissolving the dissolvable shell is positioned on the ground, the ground storage equipment acquires the well bottom information stored in the memory through the data transmission module, so that the monitoring of the well bottom information corresponding to the reservoir is realized, and the problem that the large-scale large-displacement reservoir reforming cannot be realized due to the pipe diameter limitation of the fracturing pipe column after the fracturing pipe column is put into an oil gas well is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a device for monitoring downhole information according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a downhole tool according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an adhesive module according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for monitoring downhole information during a reservoir reformation process according to an embodiment of the present invention.
1: A downhole tool; 2: a ground storage device; 3: a dissolvable shell; 31: a second pressure guiding hole; 4: an adhesive module; 41: a first pressure guiding hole; 42: a charging interface; 43: a pressure guiding groove; 5: a power module; 6: an information acquisition module; 7: a data processor; 8: a memory; 9: a data transmission module; 10: a filter circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a device for monitoring downhole information according to an embodiment of the present invention. Referring to fig. 1, the monitoring device includes: a downhole tool 1 and a surface storage device 2. Fig. 2 is a schematic cross-sectional structure of a downhole tool 1 according to an embodiment of the present invention, referring to fig. 2, the downhole tool 1 includes a dissolvable casing 3, an adhesion module 4, a power module 5, an information acquisition module 6, a data processor 7, a memory 8 and a data transmission module 9, the adhesion module 4 is used for adhering and wrapping the power module 5, the information acquisition module 6, the data processor 7, the memory 8 and the data transmission module 9, the dissolvable casing 3 is wrapped outside the adhesion module 4, the dissolvable casing 3 is dissolvable by a specified solvent, the adhesion module 4 is provided with a first pressure guiding hole 41, the dissolvable casing 3 is provided with a second pressure guiding hole 31, the second pressure guiding hole 31 is communicated with a detection end of the information acquisition module 6 by the first pressure guiding hole 41 to detect downhole information, the power module 5 is electrically connected with the information acquisition module 6, the data processor 7, the memory 8 and the data transmission module 9 respectively, the information acquisition module 6 is electrically connected with the data processor 7, the memory 8 and the data transmission module 9, and the memory 8 is electrically connected with the data transmission module 9 to detect the information acquisition module 6 and store the downhole information after the information acquisition module 6 is detected by the data processor 7. While the downhole tool 1 having dissolved the dissolvable casing 3 is at the surface, the surface storage device 2 is connected with the data transmission module 9 to obtain downhole information stored in the memory 8 via the data transmission module 9.
The power module 5 may be composed of at least one dry battery, and the at least one dry battery may be connected in parallel or in series, or may be divided into a plurality of groups, and the plurality of groups are connected in parallel after each group is connected in series. The data processor 7 may be an a/D (Analog/Digital) converter, and of course, may be other conversion circuits, as long as the electrical signal detected by the information acquisition module 6 can be converted into a Digital signal, which is not limited by the embodiment of the present invention. The memory 8 may be a memory chip or a memory card, so long as the downhole information can be stored. The ground storage device 9 may be a mobile hard disk, a notebook computer or a desktop computer, etc., so long as the storage of the well bottom information can be realized.
After setting and perforating the well by the bridge plug and perforating gun, respectively, the downhole tool 1 may be lowered into the wellbore of the well and the downhole tool 1 may be pumped through the wellhead equipment of the well to the location of the bridge plug. And then, injecting fracturing fluid into the reservoir corresponding to the oil and gas well along the sleeve and the perforated holes of the oil and gas well, so as to realize the transformation of the reservoir. In the process of modifying the reservoir, the power module 5 provides power for the information acquisition module 6, the data processor 7, the memory 8 and the data transmission module 9 respectively, so as to detect the bottom hole information corresponding to the reservoir in real time along the first pressure guiding hole 41 and the second pressure guiding hole 31 through the information acquisition module 6, and process the detected bottom hole information through the data processor 7 after the bottom hole information is acquired by the information acquisition module 6, so as to store and dispose the memory 8. After the reservoir is reformed, the flowback fluid in the oil and gas well dissolves the soluble shell 3, and the downhole tool 1 can be flowback to the ground along with the flowback fluid flowing back in the oil and gas well to the wellhead after the soluble shell 3 is dissolved. When the downhole tool 1 with the dissolvable casing 3 dissolved is located at the surface, the surface storage device 2 obtains the downhole information stored in the memory 8 through the data transmission module 9 to enable monitoring of the downhole information corresponding to the reservoir.
The soluble shell 3 can be a spherical structure made of a soluble metal material, and the soluble metal material has the characteristics of high temperature resistance and high pressure resistance so as to avoid the phenomena of deformation and the like of the soluble shell 3 in the reservoir reconstruction process, and meanwhile, the soluble metal material can be completely dissolved in a designated solvent so as to realize the dissolution of the soluble shell 3 through flowback fluid in the oil and gas well after the reservoir reconstruction is completed. For example, when the dissolvable casing 3 is in a spherical structure, the diameter of the dissolvable casing 3 is greater than or equal to 25 mm, the highest temperature that the dissolvable metallic material can withstand is 150 degrees celsius, and the highest pressure is 100 mpa. Of course, the dissolvable casing 3 may also be in an ellipsoidal configuration, so long as the downhole tool 1 is tightly coupled to the bridge plug when in position to isolate reservoirs above and below the bridge plug.
The dissolvable shell 3 may be a shell made of an aluminum-magnesium alloy, and the specified solvent corresponding to the dissolvable shell 3 may be a production fluid containing magnesium ions and chloride ions in an oil-gas well. Of course, the dissolvable casing 3 may be made of a polymer metal material, so long as dissolution in a specific solvent can occur, and the embodiment of the present invention is not limited thereto.
Referring to fig. 3, the adhesive module 4 may be a spherical structure made of an epoxy material. The epoxy resin material has the characteristics of high temperature resistance and high pressure resistance so that the bonding module 4 cannot deform under the high temperature and high pressure environment, and meanwhile, the epoxy resin material has the characteristic of small density so that after the dissolvable shell 3 is dissolved, the epoxy resin material can flow back to the ground along with flowback liquid in an oil-gas well. For example, when the bonding module 4 is in a spherical structure, the diameter of the bonding module 4 is less than or equal to 20 mm, the highest temperature that the epoxy resin material can withstand is 150 degrees celsius, and the highest pressure is 100 mpa. Of course, the adhesion module 4 may be a hexahedral structure or an octahedral structure, as long as the adhesion module 4 can seal the power module 5, the information acquisition module 6, the data processor 7, the memory 8, and the data transmission module 9, so as to avoid burning the downhole tool 1 when the power module 5, the information acquisition module 6, the data processor 7, the memory 8, or the data transmission module 9 is exposed to the liquid of the hydrocarbon well after the soluble shell 3 is dissolved.
After the power module 5, the information acquisition module 6, the data processor 7, the memory 8 and the data transmission module 9 are sealed by the adhesion module 4, the power module 5 can be a dry battery or other power source, in order to avoid waste of the downhole tool 1 after the electric quantity of the power module 5 is exhausted, referring to fig. 3, a charging interface 42 can be arranged on the adhesion module 4, the charging interface 42 is electrically connected with the power module 5, and the charging interface 42 is used for charging the power module 5. When the downhole tool 1 is located on the ground and the power of the power module 5 is low, in order to realize the repeated use of the downhole tool 1, the charging interface 42 can be connected with an external power supply, and then the power module 5 is charged through the charging interface 42. When the charging interface 42 is not used, a sealing plug can be arranged at the charging interface 42 to plug the charging interface 42, so that liquid in an oil-gas well is prevented from flowing into the power module 5 along the charging interface 42 to burn out the power module 5, and the downhole tool 1 is damaged.
When the information acquisition module 6 acquires the downhole information corresponding to the reservoir, the information acquisition module 6 may include a pressure sensor and a temperature sensor when acquiring the downhole information, since the downhole information may include the downhole pressure, the downhole temperature, and the like of the oil and gas well. The pressure sensor and the temperature sensor can convert the detected bottom hole pressure and bottom hole temperature into electric signals respectively and transmit the electric signals to the data processor 7. In order to improve accuracy of downhole information and continuously detect downhole information when downhole information is acquired, high-precision pressure sensors and temperature sensors may be employed. For example, the measuring range of the pressure sensor can be 0-100 megapascals, and the measuring accuracy can be 0.1%; the measurement range of the temperature sensor is 0-150 ℃, the measurement precision can be +/-0.5 ℃, the sampling frequency interval time of the pressure sensor and the temperature sensor can be 1 second, and the continuous measurement time is more than or equal to 5 hours.
Further, when the information acquisition module 6 detects the bottom hole pressure and bottom hole temperature of the oil and gas well along the first pressure guiding hole 41 and the second pressure guiding hole 31, in order to avoid blocking the first pressure guiding hole 41 or the second pressure guiding hole 31 due to rock debris generated in the reservoir reconstruction process, a sealing material may be disposed in the first pressure guiding hole 41 and the second pressure guiding hole 31, and the sealing material may have ventilation characteristics and may be used to prevent blocking of the first pressure guiding hole 41 and the second pressure guiding hole 31. The sealing material can be special sealing grease, has the characteristic of not dissolving under the high-temperature condition, and can prevent impurities such as rock debris from blocking the first pressure guide hole 41 or the second pressure guide hole 31, thereby realizing accurate detection of well bottom information in the reservoir reconstruction process. For example, the seal may not dissolve in a 200 degree celsius environment.
In addition, when the downhole information is acquired by the information acquisition module 6, in order to improve the comprehensiveness of the downhole information, so as to avoid that the information acquisition module only acquires the downhole information of the open area of the second pressure guiding hole 31, referring to fig. 3, the bonding module 4 may be provided with a pressure guiding groove 43, the dissolvable casing 3 may be provided with at least one second pressure guiding hole 31, and the at least one second pressure guiding hole 31 is respectively communicated with the first pressure guiding hole 41 through the pressure guiding groove 43, so that the downhole information of multiple directions corresponding to the reservoir layer can be transmitted to the first pressure guiding hole 41 through the at least one second pressure guiding hole 31 along the pressure guiding groove 43, and further the downhole information of multiple directions corresponding to the reservoir layer is detected by the information acquisition module 6, thereby improving the comprehensiveness of downhole information acquisition. The at least one second pressure guiding hole 31 may be uniformly distributed on the outer surface of the dissolvable casing 3, and of course, the at least one second pressure guiding hole 31 may also be provided based on the monitoring requirement of the downhole information. For example, the plane of the at least one second pressure guiding hole 31 may be parallel to the plane of the reservoir corresponding to the oil and gas well.
Wherein, in order to avoid the blockage of the pressure guiding groove 43 caused by the rock debris, thereby reducing the accuracy of the bottom hole pressure and the bottom hole temperature, a sealing material can be arranged in the pressure guiding groove 43 to prevent the blockage of the pressure guiding groove 43, thereby improving the accuracy of the bottom hole information detected by the information acquisition module 6. The sealing material may be the same as the sealing material provided in the first pressure guiding hole 41 and the second pressure guiding hole 31, but may be different, as long as the sealing material provided in the pressure guiding groove 43 has ventilation characteristics, and the pressure guiding groove 43 is prevented from being blocked by chips.
After the information acquisition module 6 detects the downhole information corresponding to the reservoir, the downhole information is transmitted to the data processor 7, and the electrical signals detected by the information acquisition module 6 are converted into digital signals and transmitted to the memory 8 for storage. After the reservoir is rebuilt, the dissolvable casing 3 on the surface of the downhole tool 1 dissolves in the flowback fluid in the hydrocarbon well such that the diameter of the downhole tool 1 in which the dissolvable casing 3 is dissolved, i.e. the diameter of the adhesive module 4, is smaller than the diameter of the through-flow in the bridge plug. At this time, the downhole tool 1 having dissolved the dissolvable casing 3 may be returned to the surface with the flowback fluid. After the downhole tool 1 having dissolved the dissolvable casing 3 is returned to the surface, the downhole information stored in the memory 8 may be transmitted to the surface storage device 2 for storage via the data transmission module 9.
When the data transmission module 9 is used for transmitting the downhole information, the downhole information can be transmitted through a data channel, and at this time, the data transmission module 9 can be an RS232 data interface or an RS484 interface. In the case of data transmission via the data channel, a transmission interface may also be provided on the adhesive module 4, which transmission interface is connected to the data transmission module, so that the transmission of downhole information between the memory 8 and the surface storage device 2 can be realized via the transmission interface. Of course, in order to avoid poor tightness of the transmission interface provided on the adhesive module 4, wireless data transmission between the memory 8 and the ground storage device 2 is also possible. In this case, the data transmission module 9 may be a wireless communicator such as a router. The embodiment of the present invention is not limited thereto.
Further, in order to avoid the existence of impurity signals during the process of detecting the downhole information after the downhole information transmitted by the memory 8 is received by the surface storage device 2, referring to fig. 1, the downhole information monitoring apparatus may further include a filter circuit 10, so as to perform filtering processing on the downhole information received by the surface storage device 2 by the filter circuit 10, so as to remove the impurity signals in the downhole information. After that, the filter circuit 10 can transmit the processed well bottom information to the terminal so as to display the processed well bottom information through the terminal, thereby facilitating the observation and analysis of operators.
In the embodiment of the invention, after setting and perforating the oil and gas well are respectively completed through the bridge plug and the perforating gun, the downhole tool can be lowered into the shaft of the oil and gas well and conveyed to the position of the bridge plug in a pumping mode through the wellhead equipment of the oil and gas well. And then, injecting fracturing fluid into the corresponding reservoir along the casing pipe and perforation holes of the oil-gas well in a high-pressure large-displacement mode, so as to realize the transformation of the reservoir. In the transformation process of the reservoir, the power module respectively provides power for the information acquisition module, the data processor, the memory and the data transmission module so as to detect the well bottom information of the reservoir in a plurality of directions corresponding to the reservoir in real time along the first pressure guiding hole, the pressure guiding groove and the at least one second pressure guiding hole through the information acquisition module, thereby improving the comprehensiveness of monitoring the well bottom information. After the information acquisition module acquires the well bottom information, the well bottom information is transmitted to the data processor, and the data processor converts the electric signals detected by the information acquisition module into digital signals and transmits the digital signals to the memory for storage. After the reservoir is reformed, the flowback fluid in the oil and gas well dissolves the soluble shell, so that the downhole tool with the soluble shell dissolved is flowback to the ground, and then, the well bottom information stored by the storage is transmitted to the ground storage equipment through the RS232 data interface or the RS484 data interface arranged on the bonding module, so that the monitoring of the well bottom information corresponding to the reservoir is realized, and the problem that the reservoir is reformed in a large scale because the pipe diameter of the fracturing pipe column is limited after the fracturing pipe column is put into the oil and gas well is avoided.
FIG. 4 is a method of monitoring downhole information during a reservoir reclamation process, according to an embodiment of the present invention. Referring to fig. 4, the method includes the following steps.
Step 401: and detecting well bottom information based on the information acquisition module when the downhole tool is positioned at a preset position in the reservoir reconstruction process.
In order to improve the recovery efficiency and recovery ratio of the reservoir, the reservoir can be modified after setting and perforating operations of the oil and gas well are completed through a bridge plug and a perforating gun respectively. In the process of modifying the reservoir, in order to continuously monitor the bottom hole information corresponding to the reservoir, the downhole tool described in the above embodiment may be lowered to a preset position of the oil and gas well after completing the setting and perforation operations on the oil and gas well, so as to isolate the position above the preset position from the position below the preset position by the downhole tool. And in the process of reforming the reservoir, the information acquisition module can continuously detect the well bottom information corresponding to the reservoir through the second pressure guide hole on the dissolvable shell and the first pressure guide hole on the bonding module.
The preset position may be the position of the bridge plug in the oil and gas well, and the outer diameter of the downhole tool is larger than the inner diameter of the bridge plug, so that the position above the bridge plug and the position below the bridge plug are isolated through combination of the downhole tool and the bridge plug. The bottom hole information may include bottom hole pressure and bottom hole temperature corresponding to the reservoir, and the information acquisition module may include a pressure sensor when detecting the bottom hole pressure corresponding to the reservoir; the information acquisition module may include a temperature sensor when detecting a corresponding bottom hole temperature of the reservoir.
Step 402: and processing the well bottom information detected by the information acquisition module through a data processor, and storing the well bottom information in a memory.
When the information acquisition module detects the well bottom information, the detected well bottom information can be transmitted to the data processor in real time, so that the electric signals detected by the data processor well information acquisition module are converted into digital information. And then, transmitting the converted digital signals to a memory to realize the storage of well bottom information.
The data processor may be an a/D converter, and of course, the data processor may be other conversion circuits. The memory may be a memory chip or a memory card, so long as the memory may be a memory for implementing the bottom hole information of the digital signal, which is not limited in the embodiment of the present invention.
It should be noted that, in the process of modifying the reservoir, the power module continuously provides power for the information acquisition module, the data processor and the memory, so that the steps 401-402 can be continuously executed, so that the information acquisition module continuously detects the downhole information corresponding to the reservoir, and the downhole information is stored in the memory after being processed by the data processor.
Step 403: the surface storage device obtains downhole information stored by the memory via the data transmission module while the downhole tool with the solvent-dissolved dissolvable shell designated is at the surface.
After the reservoir is reformed, the specified solvent can be returned to the oil and gas well and returned to the ground along the oil and gas well. When flowback fluid in the reservoir is flowback into the hydrocarbon well, the specified solvent achieves complete dissolution of the dissolvable shell, and a downhole tool in which the dissolvable shell is dissolved can be flowback to the surface with the flowback fluid in the hydrocarbon well. When the downhole tool with the dissolved shell is located on the ground, the ground storage device can acquire the downhole information stored in the memory through the data transmission module so as to monitor the downhole information corresponding to the reservoir.
The specified solvent discharged from the reservoir can be a solvent containing aluminum ions or magnesium ions, and the dissolvable shell can be a shell made of aluminum-magnesium alloy. Of course, the dissolvable casing may also be made of a polymeric metal material, so long as the dissolvable casing can be completely dissolved in the specified solvent discharged from the reservoir flowback. The ground storage device can be a mobile hard disk, a notebook computer or a desktop computer, and the like. When the downhole information is transmitted through the data transmission module, the downhole information can be transmitted through the data channel, and at the moment, the data transmission module can be an RS232 data interface or an RS484 interface. Of course, wireless data transmission can be performed between the memory and the ground storage device, and at this time, the data transmission module may be a wireless communicator such as a router.
In the embodiment of the invention, in the process of modifying the reservoir, the power module respectively provides power for the information acquisition module, the data processor, the memory and the data transmission module so as to continuously detect the well bottom information corresponding to the reservoir along the first pressure guide hole and the second pressure guide hole through the information acquisition module. After the information acquisition module acquires the well bottom information, the well bottom information is transmitted to the data processor, and the data processor converts the electric signals detected by the information acquisition module into digital signals and transmits the digital signals to the memory for storage. After the reservoir is reformed, the flowback fluid in the oil gas well dissolves the soluble shell, so that the downhole tool dissolving the soluble shell is flowback to the ground, and then the downhole information stored by the memory is transmitted to the ground storage equipment through the data transmission module, so that the monitoring of the corresponding downhole information of the reservoir is realized, and the problem that the large-scale large-displacement reservoir reformation cannot be realized due to the pipe diameter limitation of the fracturing pipe column after the fracturing pipe column is put into the oil gas well is avoided.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A monitoring device for downhole information, the monitoring device comprising: a downhole tool and a surface storage device, the downhole tool comprising a dissolvable casing, an adhesive module, a power module, an information acquisition module, a data processor, a memory, and a data transmission module;
the bonding module is used for bonding and wrapping the power module, the information acquisition module, the data processor, the memory and the data transmission module, the dissolvable shell is wrapped outside the bonding module and can be dissolved through a specified solvent, a first pressure guide hole is formed in the bonding module, a second pressure guide hole is formed in the dissolvable shell, and the second pressure guide hole is communicated with a detection end of the information acquisition module through the first pressure guide hole so as to detect downhole information;
The power module is respectively and electrically connected with the information acquisition module, the data processor, the memory and the data transmission module, the information acquisition module is electrically connected with the data processor, the data processor is electrically connected with the memory, and the memory is electrically connected with the data transmission module so as to process the well bottom information detected by the information acquisition module through the data processor and then store the processed well bottom information into the memory;
When the downhole tool dissolving the dissolvable casing is located at the surface, the surface storage device is connected with the data transmission module to obtain downhole information stored in the memory through the data transmission module.
2. The monitoring device of claim 1, wherein the dissolvable shell is an almag shell and the specified solvent is flowback fluid containing magnesium ions and chloride ions in an oil and gas well.
3. The monitoring device of claim 1, wherein seals are disposed within the first pressure vent and the second pressure vent, the seals having venting characteristics and being configured to prevent clogging of the first pressure vent and the second pressure vent.
4. A monitoring device according to claim 3, wherein the adhesive module is provided with a pressure guiding groove, and the dissolvable casing is provided with at least one second pressure guiding hole, and at least one second pressure guiding hole is respectively communicated with the first pressure guiding hole through the pressure guiding groove.
5. The monitoring device of claim 4, wherein at least one of the second pressure-directing holes is uniformly distributed on the outer surface of the dissolvable shell.
6. The monitoring device of claim 4, wherein the seal is disposed within the pressure groove, the seal configured to prevent clogging of the pressure groove.
7. The monitoring device of claim 1, wherein a charging interface is provided on the adhesive module, the charging interface being electrically connected to the power module, the charging interface being configured to charge the power module.
8. The monitoring device of claim 1, wherein the adhesive module and the dissolvable shell are each of a spherical configuration.
9. The monitoring device of any one of claims 1-8, wherein the information acquisition module includes a pressure sensor and a temperature sensor.
10. A method of monitoring downhole information during a reservoir intervention based on the monitoring device of any of claims 1-9, the method comprising:
Detecting well bottom information based on the information acquisition module when the downhole tool is located at a preset position in the reservoir reconstruction process;
processing the well bottom information detected by the information acquisition module through the data processor and storing the well bottom information in the memory;
The surface storage device obtains downhole information stored by the memory via the data transmission module while the downhole tool having the dissolvable casing dissolved by the specified solvent is at the surface.
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| CN105840166A (en) * | 2016-04-19 | 2016-08-10 | 中石化重庆涪陵页岩气勘探开发有限公司 | Horizontal well fracturing gas testing and well completion technology adopting completely dissoluble bridge plug |
| CN208073470U (en) * | 2018-02-05 | 2018-11-09 | 中国石油天然气股份有限公司 | The monitoring device of shaft bottom information |
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| US8899322B2 (en) * | 2006-09-20 | 2014-12-02 | Baker Hughes Incorporated | Autonomous downhole control methods and devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105840166A (en) * | 2016-04-19 | 2016-08-10 | 中石化重庆涪陵页岩气勘探开发有限公司 | Horizontal well fracturing gas testing and well completion technology adopting completely dissoluble bridge plug |
| CN208073470U (en) * | 2018-02-05 | 2018-11-09 | 中国石油天然气股份有限公司 | The monitoring device of shaft bottom information |
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