CN113216898A - Full-solution fracturing bridge plug - Google Patents
Full-solution fracturing bridge plug Download PDFInfo
- Publication number
- CN113216898A CN113216898A CN202110239335.9A CN202110239335A CN113216898A CN 113216898 A CN113216898 A CN 113216898A CN 202110239335 A CN202110239335 A CN 202110239335A CN 113216898 A CN113216898 A CN 113216898A
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- Prior art keywords
- soluble
- bridge plug
- slip
- fully
- dissolvable
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- 239000000956 alloy Substances 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 238000012856 packing Methods 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract 2
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 18
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 7
- 238000004873 anchoring Methods 0.000 abstract description 6
- 239000000919 ceramic Substances 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 5
- 239000002923 metal particle Substances 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000004090 dissolution Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B47/06—Measuring temperature or pressure
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a full-solution fracturing bridge plug, which is characterized in that: including the center tube, the upper end periphery cover of center tube is equipped with packing element assembly, lock sleeve and locking spring, disposes slips and lower clutch in the lower extreme periphery of center tube, locking spring, lock sleeve, center tube, slips and lower clutch adopt soluble alloy to make, the packing element assembly is vulcanized by soluble rubber and soluble metal support ring and forms, the spraying of slips surface has soluble hardcoat. The slip is simple in structure, the slip is tightly attached to the pipe wall through the soluble hard coating on the surface to form friction, the purpose of anchoring the bridge plug is achieved, teeth or teeth of the traditional slip do not bite into the pipe wall, the problem of biting the inner wall of the sleeve is avoided, the anti-blocking capacity is high, the slip is made of soluble alloy, the slip can be completely dissolved, fine powder is formed after the slip is dissolved, hard metal particles or ceramic particles are avoided, shaft cleaning is not needed in the later period, and the construction efficiency is further improved.
Description
Technical Field
The invention relates to the technical field of key downhole tools for developing unconventional gas reservoirs, in particular to a full-solution fracturing bridge plug.
Background
In the field of oil and gas development, staged fracturing operation is often required to be carried out on different intervals of vertical well shafts, directional well shafts or horizontal well shafts. In the implementation of the casing staged fracturing process, the soluble bridge plug can be used for not only realizing the purpose that a temporarily sealed shaft meets the fracturing construction requirement, but also having the advantages that the soluble bridge plug can be automatically dissolved under the well conditions, so that the drilling plug operation after the fracturing operation is completed is reduced and avoided, the overall cost and the operation risk are reduced, and the soluble bridge plug is widely applied to the unconventional oil and gas development in recent years.
In the prior art, although the soluble bridge plug has various structures, most of anchoring slips of the bridge plug consist of soluble metal and insoluble alloy or ceramic particles, undissolved residues such as slip blocks, slip tooth blocks and the like are remained in a shaft after dissolution, the shaft needs to be further cleaned in the later period, and the operation period is long and the cost is high. On the other hand, for oilfield users, more information such as downhole temperature and pressure change in the fracturing construction process and after the construction is finished is needed. The existing underground optical fiber detection technology can only realize detection after fracturing, cannot detect the underground pressure change condition in fracturing construction in real time, and bridge plug fragments, alloy or ceramic particles which are not completely dissolved in a shaft cause great difficulty in smooth running of a testing instrument, so that the testing cost is high, and the period is long, which also is the biggest problem of puzzling users.
Disclosure of Invention
The invention aims to solve the technical problem of providing a full-solution fracturing bridge plug which is simple in structure and capable of improving construction efficiency aiming at the defects in the prior art.
The technical scheme adopted by the invention is as follows: a full solution fracturing bridge plug is characterized in that: including the center tube, the upper end periphery cover of center tube is equipped with packing element assembly, lock sleeve and locking spring, disposes slips and lower clutch in the lower extreme periphery of center tube, locking spring, lock sleeve, center tube, slips and lower clutch adopt soluble alloy to make, the packing element assembly is vulcanized by soluble rubber and soluble metal support ring and is formed.
According to the technical scheme, the outer surface of the slip is sprayed with a soluble hard coating.
According to the technical scheme, the lower end part of the central tube is in a conical shape with gradually decreasing radius, the conical shape is matched with the inner conical surface of the slip, and the lower end surface of the slip is matched with the concave-convex teeth on the upper end surface of the lower connector through the concave-convex teeth.
According to the technical scheme, the lock spring, the lock sleeve and the central pipe are respectively provided with sawtooth threads, the inner sawtooth threads of the lock spring are meshed with the outer sawtooth threads of the central pipe, and the outer sawtooth threads of the lock spring are matched with the inner sawtooth threads of the lock sleeve to realize the interlocking of the lock spring and the central pipe.
According to the technical scheme, the lower joint is internally provided with a releasing control thread which is configured with the releasing rod of the adapter through the thread.
According to the technical scheme, the ball seat is arranged in the middle of the central tube.
According to the technical scheme, the periphery of the lower end of the central tube is provided with the radial blind hole.
According to the technical scheme, the bridge plug ball seat structure further comprises a soluble information ball which is used for being configured with the bridge plug ball seat, the soluble information ball comprises a soluble upper shell and a soluble lower shell, a sensor, a control electric plate and a micro battery are installed in the soluble upper shell and are arranged in a sealing mode through a packaging blind plate, and the soluble upper shell is connected with the soluble lower shell through threads.
According to the technical scheme, the upper half part and the lower half part of the soluble shell are provided with pressure transmitting holes, and the sensor is communicated with the pressure transmitting holes.
According to the technical scheme, the sensors are temperature sensors and pressure sensors.
The beneficial effects obtained by the invention are as follows:
1. the slip is simple in structure, the slip is tightly attached to the pipe wall through the soluble hard coating on the surface to form friction, the purpose of anchoring the bridge plug is achieved, teeth or teeth of the traditional slip do not bite into the pipe wall, the problem of biting the inner wall of the sleeve is avoided, the anti-blocking capacity is high, the slip is made of soluble alloy, the slip can be completely dissolved, fine powder is formed after the slip is dissolved, hard metal particles or ceramic particles are avoided, shaft cleaning is not needed in the later period, and the construction efficiency is further improved.
2. The bridge plug central tube adopts down cone type structure, and the axial pressure difference that bears after the bridge plug is set up is big more, and the axial force that produces is big more, and it is big more to produce the awl power of rising to the slips through central tube lower extreme toper cylinder, does benefit to the slips more and hugs closely the pipe wall more, and the anchoring effect is better.
3. The ball seat position design in the bridge plug is in the center tube middle part position, and is unanimous with the packing element assembly sealing position after the bridge plug seat seals for the pressure balance inside and outside the center tube upper end, center pipe wall do not receive the pressure differential force, reduce the requirement to center tube material intensity.
4. The releasing rod is directly connected with the lower connector through threads, the releasing load value is determined through thread strength, the transmission of the setting force is more direct and efficient, the collision of the bridge plug in the high-speed pumping process is directly transmitted to the setting tool through the releasing rod, and slips are fully protected. If the slips are collided or broken by impact force, the bridge plug is easily set and set.
5. The soluble information ball can not only seal the channel in the bridge plug to achieve the purpose of sealing the upper and lower layer sections, but also can monitor the underground pressure and temperature before and after construction in real time by the built-in sensor and control circuit. After the construction is finished, the shell of the soluble information ball is dissolved, and the memory on the control circuit can fall off from the sensor, the battery and the like. The micro-memory returns to the ground along with the flow-back liquid in the later bridge plug dissolving process, and the ground reads the information in the memory to guide the subsequent construction.
Drawings
FIG. 1 is a schematic view of a fully dissolvable bridge plug according to the present invention.
FIG. 2 is a schematic view of the connection of the fully soluble bridge plug and adapter of the present invention.
FIG. 3 is a schematic diagram of a soluble message ball structure according to the present invention.
Wherein: 1. the device comprises a lock spring, 2, a lock sleeve, 3, a rubber cylinder assembly, 4, a soluble information ball, 4-1, a soluble upper shell, 4-2, a soluble lower shell, 4-3, a sensor, 4-4, a control electric plate, 4-5, a micro battery, 4-6 and a packaging blind plate; 5. a central tube, 6, a soluble slip, 7, a lower joint, 8, a connecting rod, 9, a push cylinder, 10 and a hand-losing rod.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and 2, the present embodiment provides a completely-dissolved fracturing bridge plug, which includes a central tube 5, a rubber cylinder assembly 3, a lock sleeve 2 and a lock spring 1 are sleeved on the outer periphery of the upper end of the central tube 5, a slip 6 and a lower joint 7 are arranged on the outer periphery of the lower end of the central tube 5, a soluble hard coating is sprayed on the outer surface of the slip 6, and the slip is tightly attached to the tube wall through the soluble hard coating on the surface to form friction, so as to achieve the purpose of anchoring the bridge plug.
In the invention, the lock spring 1, the lock sleeve 2, the central pipe 5, the slips 6 and the lower joint 7 are made of soluble alloy, and the outer surface of the slips 6 is sprayed with a soluble hard coating. The rubber cylinder assembly 3 is formed by vulcanizing soluble rubber and a soluble metal support ring. The fully soluble bridge plug of the embodiment adopts soluble alloy, soluble rubber and a soluble coating, is fine powder after being dissolved, does not contain hard metal particles or ceramic particles, does not need to be cleaned in a shaft at the later stage, and further improves the construction efficiency.
In this embodiment, the lock spring 1, the lock sleeve 2 and the central tube 5 are all provided with sawtooth threads, the inner sawtooth threads of the lock spring 1 are meshed with the outer sawtooth threads of the central tube 5, and the outer sawtooth threads of the lock spring 1 are used for being matched with the inner sawtooth threads of the lock sleeve 2 to realize the interlocking of the lock spring and the central tube.
The lower end of the central tube 5 is conical with gradually decreasing radius, the conical lower end is matched with an inner conical surface of the slip 6, and a radial blind hole is formed in the periphery of the lower end of the central tube and used for reducing weight.
The lower end surface of the slip 6 is matched with the concave-convex teeth on the upper end surface of the lower joint 7 through the concave-convex teeth. And a releasing control thread is arranged in the lower joint 7 and is configured with the releasing rod of the adapter through the thread.
In this embodiment, the ball seat position design in the bridging plug is in center tube middle part position, and is unanimous with the packing element assembly sealing position after the bridging plug sits and seals for pressure balance inside and outside the center tube upper end, center tube wall do not receive the pressure differential force, reduce the requirement to center tube material intensity.
In the embodiment, the bridge plug ball seat further comprises a soluble information ball which is used for being configured with the bridge plug ball seat, the soluble information ball comprises a soluble upper shell 4-1 and a soluble lower shell 4-2, a cavity is arranged in the soluble upper shell, a sensor 4-3, a control electric plate 4-4 and a micro battery 4-5 are arranged in the cavity, the high-temperature battery 4-5 and the control electric plate 4-4 are sealed with the sensor through a packaging blind plate 4-6, circuit protection is achieved, and the shell can meet the pressure bearing requirement. The soluble upper shell 4-1 is connected with the soluble lower shell 4-2 through threads. The upper half part and the lower half part of the soluble shell are provided with pressure transmitting holes, and the sensor is communicated with the pressure transmitting holes. Specifically, the sensor is a temperature sensor and a pressure sensor.
In the embodiment, the soluble information ball can not only seal the channel in the bridge plug to achieve the purpose of sealing the upper and lower layer sections, but also can monitor the underground pressure and temperature before and after construction in real time by the built-in sensor and control circuit. After the construction is finished, the shell of the soluble information ball is dissolved, and the memory on the control circuit can fall off from the sensor, the battery and the like. The micro-memory returns to the ground along with the flow-back liquid in the later bridge plug dissolving process, and the ground reads the information in the memory to guide the subsequent construction.
The construction steps are as follows:
before descending the well, the fully soluble bridge plug and the adapter are assembled as shown in figure 2, wherein the adapter comprises a connecting rod 8, a push cylinder 9 and a releasing rod 10, the connecting rod 8 and the push cylinder 9 are respectively connected with gunpowder or a hydraulic setting tool, and the releasing rod 10 is connected with the lower joint 7 through releasing threads.
After the tool is strung into the well, liquid is continuously pumped and injected through a wellhead to push or is conveyed to a designed position through an oil pipe. After reaching the designed position, the electric signal is transmitted through the cable to ignite gunpowder in the setting tool or the setting tool is pressed through the ground to set the bridge plug. In the setting process, the hand throwing rod 10 drives the lower joint 7 to move upwards along the central pipe 5 through threads, the pushing cylinder 9 pushes the lock sleeve 2 and the lock sleeve 1 to move downwards along the central pipe 5, the compression rubber cylinder assembly 3 seals an annular space between the central pipe 5 and the inner wall of the sleeve, and the soluble slips 6 are broken into multiple uniform petals under the conical expansion acting force of the conical cylindrical surface at the lower end of the central pipe 5 and are tightly attached to the inner wall of the sleeve, so that the anchoring of the bridge plug is realized.
After the bridge plug is seated, a soluble information ball 4 is thrown into the bridge plug from a ground wellhead to form sealing at the step inside a central tube 5 of the bridge plug, so that the purpose of sealing upper and lower intervals is realized. After the upper and lower intervals are sealed and separated, the fracturing reconstruction construction of the stratum corresponding to the upper interval can be implemented. The soluble information ball monitors the pressure and temperature changes of the upper and lower layer sections through the pressure transmitting holes and stores the pressure and temperature changes, and the stored content and capacity can be set on the ground in advance.
And (2) performing open flow on the well mouth after fracturing construction is finished, returning liquid in a shaft to the ground through a central passage of the bridge plug in the open flow process, dissolving (or corroding) all parts of the bridge plug in the process that well liquid flows through the bridge plug, and leading fine scraps to be brought to the ground along with the flow-back liquid to be uniformly recovered. The soluble information ball is also dissolved along with the dissolution of the bridge plug, and the memory on the control circuit left after the dissolution comes off from the sensor, the battery, and the like. The micro-memory returns to the ground along with the flow-back liquid in the later bridge plug dissolving process, and the ground reads the information in the memory. The read downhole pressure and temperature information can be used as important parameters of a fracturing designer to guide subsequent construction.
Claims (9)
1. A full solution fracturing bridge plug is characterized in that: including the center tube, the upper end periphery cover of center tube is equipped with packing element assembly, lock sleeve and locking spring, disposes slips and lower clutch in the lower extreme periphery of center tube, locking spring, lock sleeve, center tube, slips and lower clutch adopt soluble alloy to make, the packing element assembly is vulcanized by soluble rubber and soluble metal support ring and forms, the spraying of slips surface has soluble hardcoat.
2. The fully-dissolvable fracture bridge plug of claim 1, wherein: the lower end part of the central tube is conical with gradually decreasing radius, the conical lower end part is matched with an inner conical surface of the slip, and the lower end surface of the slip is matched with concave-convex teeth on the upper end surface of the lower connector through concave-convex teeth.
3. The fully-dissolvable fracture bridge plug according to claim 1 or 2, wherein: the lock spring, the lock sleeve and the central pipe are all provided with sawtooth threads, the inner sawtooth threads of the lock spring are meshed with the outer sawtooth threads of the central pipe, and the outer sawtooth threads of the lock spring are matched with the inner sawtooth threads of the lock sleeve to realize the interlocking of the lock spring, the lock sleeve and the central pipe.
4. The fully-dissolvable fracture bridge plug according to claim 1 or 2, wherein: and a releasing control thread is arranged in the lower joint and is configured with the releasing rod of the adapter through the thread.
5. The fully-dissolvable fracture bridge plug according to claim 1 or 2, wherein: a ball seat is arranged in the middle of the central tube.
6. The fully-dissolvable fracture bridge plug according to claim 1 or 2, wherein: the periphery of the lower end of the central tube is provided with a radial blind hole.
7. The fully-dissolvable fracture bridge plug according to claim 1 or 2, wherein: the soluble information ball comprises a soluble upper shell and a soluble lower shell, a sensor, a control electric plate and a micro battery are arranged in the soluble upper shell, the soluble upper shell and the soluble lower shell are in threaded connection, and the micro battery is sealed through a packaging blind plate.
8. The fully-dissolvable fracture bridge plug of claim 7, wherein: the upper half part and the lower half part of the soluble shell are provided with pressure transmitting holes, and the sensor is communicated with the pressure transmitting holes.
9. The fully-dissolvable fracture bridge plug of claim 7, wherein: the sensors are temperature sensors and pressure sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110239335.9A CN113216898A (en) | 2021-03-04 | 2021-03-04 | Full-solution fracturing bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110239335.9A CN113216898A (en) | 2021-03-04 | 2021-03-04 | Full-solution fracturing bridge plug |
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| Publication Number | Publication Date |
|---|---|
| CN113216898A true CN113216898A (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110239335.9A Pending CN113216898A (en) | 2021-03-04 | 2021-03-04 | Full-solution fracturing bridge plug |
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| CN (1) | CN113216898A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113881375A (en) * | 2021-10-08 | 2022-01-04 | 成都托克密封件有限责任公司 | Slip coating and preparation method thereof, slip and soluble bridge plug |
| CN114737941A (en) * | 2022-05-27 | 2022-07-12 | 中国石油化工股份有限公司 | Staged fracturing construction method for long well section |
| CN114934758A (en) * | 2022-05-30 | 2022-08-23 | 中国石油化工股份有限公司 | Well-flushing temporary plugging tool for fracturing of low-permeability reservoir horizontal well |
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| CN211500579U (en) * | 2019-12-10 | 2020-09-15 | 阜新市石油工具厂 | Resettable profiling sealing assembly |
| CN112253044A (en) * | 2020-11-05 | 2021-01-22 | 中国石油集团渤海钻探工程有限公司 | High-ductility small-diameter dissolvable bridge plug |
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| US20140251600A1 (en) * | 2013-03-06 | 2014-09-11 | Lawrence Livermore National Security, Llc | Encapsulated microsensors for reservoir interrogation |
| CN204532243U (en) * | 2015-04-01 | 2015-08-05 | 中国石油化工股份有限公司江汉油田分公司采油工艺研究院 | A kind of big orifice press-fracturing bridge plug |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113881375A (en) * | 2021-10-08 | 2022-01-04 | 成都托克密封件有限责任公司 | Slip coating and preparation method thereof, slip and soluble bridge plug |
| CN113881375B (en) * | 2021-10-08 | 2022-03-25 | 成都托克密封件有限责任公司 | Slip coating and preparation method thereof, slip and soluble bridge plug |
| CN114737941A (en) * | 2022-05-27 | 2022-07-12 | 中国石油化工股份有限公司 | Staged fracturing construction method for long well section |
| CN114737941B (en) * | 2022-05-27 | 2024-05-17 | 中国石油化工股份有限公司 | Staged fracturing construction method for long well section |
| CN114934758A (en) * | 2022-05-30 | 2022-08-23 | 中国石油化工股份有限公司 | Well-flushing temporary plugging tool for fracturing of low-permeability reservoir horizontal well |
| CN114934758B (en) * | 2022-05-30 | 2024-05-17 | 中国石油化工股份有限公司 | Flushing temporary plugging tool for fracturing low-permeability reservoir horizontal well |
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