CN106979003B - Bypass type balance structure of underground instrument - Google Patents
Bypass type balance structure of underground instrument Download PDFInfo
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- CN106979003B CN106979003B CN201710333636.1A CN201710333636A CN106979003B CN 106979003 B CN106979003 B CN 106979003B CN 201710333636 A CN201710333636 A CN 201710333636A CN 106979003 B CN106979003 B CN 106979003B
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- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 48
- 239000010720 hydraulic oil Substances 0.000 description 7
- 239000010985 leather Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011900 installation process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Actuator (AREA)
Abstract
The utility model discloses a bypass type balance structure of a downhole instrument, which comprises a balance main body, wherein a balance piston assembly and a concave cavity for accommodating the balance piston assembly are arranged on the side wall of the balance main body; one side of the balance piston assembly is communicated with an external slurry column, the other side of the balance piston assembly is communicated with an internal oil way of the balance main body, and the balance piston assembly is used for balancing the pressure between the external slurry column and the internal oil way of the balance main body; the invention can be applied to the technical field of underground instruments, can effectively overcome the defects in the prior art, can prolong the service life, and can effectively ensure the convenience of later maintenance operation.
Description
Technical Field
The application relates to but is not limited to a downhole instrument, in particular to a bypass type balancing structure of the downhole instrument.
Background
In the prior art, a leather bag balance structure or a wire-passing balance structure is mostly adopted for a downhole instrument balance structure; wherein, the leather bag balanced structure mainly includes both ends sealing fixed part and leather bag, and it realizes corresponding balanced operation through the annular hydraulic oil of inside of leather bag or balanced liquid and the annular well fluid of outside of leather bag, and above-mentioned leather bag balanced structure exists following shortcoming: the service life is short and the reliability is low.
The line-passing type balance structure mainly comprises a balance piston, a balance cylinder body, a return spring and an oil level detection device, the balance piston of the balance device balances the pressure of hydraulic oil or balance liquid inside the instrument and external well liquid, and the balance piston moves at the position of the balance cylinder body and can adapt to the situation that the hydraulic oil or balance liquid inside the instrument device is in the pit. The volume change of hydraulic oil or balance liquid is caused along with the change of underground environment pressure and temperature, when the instrument leaks the hydraulic oil or the balance liquid, the displacement of the balance piston exceeds a reasonable position, a travel switch of the oil level detection device is triggered to act, ground operators are reminded to carry out instrument conditions, and balance operation is achieved. However, the adoption of the wire-through type balance structure has the following disadvantages: the maintenance workload is large, and the maintainability is poor.
Disclosure of Invention
The technical problem that this application was solved provides an instrument bypass formula balanced structure in pit, can effectively overcome the defect that exists among the prior art, can improve life, can effectively guarantee the convenience of later maintenance operation.
In order to solve the technical problem, the application provides a bypass type balance structure of a downhole instrument, which comprises a balance main body,
the side wall of the balance main body is provided with a balance piston assembly and an inwards concave cavity for accommodating the balance piston assembly; one side of the balance piston assembly is communicated with the external slurry column, the other side of the balance piston assembly is communicated with the internal oil way of the balance main body, and the balance piston assembly is used for balancing the pressure between the external slurry column and the internal oil way of the balance main body.
The bypass type balance structure of the underground instrument can also have the following characteristics,
the balance piston assembly comprises a piston, a spring connected with the piston and an outer cylinder arranged outside the piston, wherein one end of the outer cylinder is provided with a first through hole communicated with an external slurry column, and the other end of the outer cylinder is provided with a second through hole communicated with the inside of the balance main body; one end of the spring is fixed at the end part of the outer cylinder close to the first through hole, and the other end of the spring is connected with the piston.
The bypass type balance structure of the underground instrument can also have the following characteristics,
and a locking block is arranged between the outer barrel and the balance main body.
The bypass type balance structure of the underground instrument can also have the following characteristics,
the locking block is arranged between the end part of the outer barrel close to the first through hole and the end part of the opposite cavity, and the locking block is used for fixing the balance piston assembly in the cavity.
The bypass type balance structure of the underground instrument can also have the following characteristics,
an adapter is arranged between the outer barrel and the balance body and used for communicating a second through hole of the outer barrel and an internal oil way of the balance body.
The bypass type balance structure of the underground instrument can also have the following characteristics,
the balance main body is connected with a ground control device through a control circuit;
the balance piston assembly further comprises a sensor, the sensor is used for detecting the oil quantity of the internal oil way of the balance main body and sending a detection signal to the ground control device through the control circuit, and the ground control device is used for monitoring the oil quantity of the internal oil way according to the detection signal.
The bypass type balance structure of the underground instrument can also have the following characteristics,
the sensor is a travel switch, and the travel switch is arranged in the outer barrel at a position close to the second through hole.
The bypass type balance structure of the underground instrument can also have the following characteristics,
the balance body is internally provided with an eccentric wire passing hole, and a signal wire of the control circuit passes through the eccentric wire passing hole and then is connected with the ground control device.
The above technical scheme of this application has following beneficial effect:
according to the technical scheme provided by the invention, the balance piston assembly arranged in the concave cavity on the side wall of the balance main body can be used for realizing very convenient disassembly, assembly and maintenance operations; the setting of accessible spring can guarantee that the inside oil circuit pressure of balanced main part is a little more than mud column pressure all the time, is favorable to guaranteeing hydraulic system safety, reaches balanced effect.
Furthermore, the balance piston assembly can be fixed in the cavity through the arrangement of the locking block; in the installation process, the locking block and the outer cylinder of the balance piston assembly can be placed in the concave cavity, and the locking block is locked, so that the balance piston assembly can be fixed in the cavity; when the balance piston assembly needs to be disassembled, the locking block can be unlocked, and the operation of freely taking out the balance piston assembly can be realized; the setting of accessible sensor can realize detecting the oil mass of the inside oil circuit of balanced main part to take corresponding measure in order to avoid the instrument heavy loss because of lacking oil and causing.
Furthermore, the eccentric wire passing hole can be arranged, so that all power supplies and signal cables in the balance main body can be provided with wire passing channels, the balance piston assembly can be quickly disassembled and assembled, and the maintenance operation of the circuit can be reduced to the maximum extent in the operation process.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in connection with figure 1 of the drawings,
the embodiment of the invention provides a bypass type balance structure of a downhole instrument, which comprises a balance main body 1, wherein a balance piston assembly and an inwards concave cavity for accommodating the balance piston assembly are arranged on the side wall of the balance main body 1; one side of the balance piston assembly is communicated with an external slurry column, the other side of the balance piston assembly is communicated with an internal oil way of the balance main body 1, and the balance piston assembly is used for balancing pressure between the external slurry column and the internal oil way of the balance main body 1.
In the specific operation, the balance piston assembly arranged in the concave cavity on the side wall of the balance main body 1 can effectively ensure the convenience of the disassembly and assembly operation of the balance piston assembly; the supporting and connecting functions of the instrument can be realized through the balance body, and the balance piston assembly is arranged on the balance body 1 to play a role of dynamic balance; the balance body 1 is applied to an instrument, and can realize the connection and support functions with the upper part and the lower part of the instrument through the upper joint 3 and the lower joint; wherein, a quick plug-in connector 4 can be arranged between the upper connector 3 and the balance body 1.
Among the prior art, balanced main part 1 is long and thin part, and the balanced piston assembly that its adopted all installs in the inside of balanced main part 1, when balanced piston assembly needs the dismouting maintenance operation, needs to take out balanced main part 1 whole dismantlement, and then just can take out the balanced piston assembly that needs to maintain, and above-mentioned operation is wasted time and energy, has seriously reduced actual production efficiency. Compared with the prior art, the above-mentioned balance piston assembly that sets up in the indent cavity on balanced main part 1 lateral wall that this application provided then can realize very convenient dismouting maintenance operation, sets up the indent cavity on balanced main part 1 lateral wall based on it, when needs dismouting maintenance operation, can directly go on in balanced main part 1's lateral wall outside, need not to dismantle balanced main part 1 is whole, can effectively improve actual operating efficiency.
Preferably, in the specific operation of the present invention, the balance piston assembly comprises a piston 9, a spring 7 connected with the piston 9, and an outer cylinder 8 disposed outside the piston 9, wherein one end of the outer cylinder 8 is provided with a first through hole 13 communicated with an external slurry column, and the other end is provided with a second through hole 11 communicated with the inside of the balance body 1; one end of the spring 7 is fixed at the end part of the outer cylinder 8 close to the first through hole 13, and the other end is connected with the piston 9.
In the specific operation, the piston 9 realizes dynamic balance under the action of the pressure of an external slurry column and the pressure of an internal oil circuit of the balance main body 1; meanwhile, in the dynamic balancing process, the spring 7 is in a compressed state, namely, the sum of the elastic force of the spring 7 and the pressure of an external mud column is equal to the pressure of an internal oil circuit of the balancing main body 1; therefore, under the action of the spring 7, the balance piston assembly can ensure that the pressure of an oil circuit inside the balance main body 1 is slightly higher than the pressure of a slurry column all the time, so that the safety of a hydraulic system is ensured, and the balance effect is achieved.
It should be noted that when the internal oil path of the balance body 1 is not filled with hydraulic oil, the piston 9 is located at the end of the outer cylinder 8 close to the second through hole 11 under the action of the spring 7; when the internal oil way of the balance body 1 is slowly filled with hydraulic oil, the piston 9 overcomes the elastic force of the spring 7 and moves towards the end part of the first through hole 13 under the action of the internal oil way pressure; when the position of the piston 9 reaches a preset position, the pressure of the internal oil circuit on the surface at the moment meets the actual production requirement, namely the piston 9 completes dynamic balance between the pressure of the internal oil circuit and the pressure of an external slurry column at the position; wherein, balanced main part 1 is equipped with the oil filler point and is used for blockking up the oiling end cap 5 of oil filler point.
Preferably, in the specific operation of the present invention, a locking block 6 is disposed between the outer cylinder 8 and the balance body 1.
In the specific operation, the locking block 6 is arranged between the end part of the outer cylinder 8 close to the first through hole 13 and the opposite end part of the cavity, and the locking block 6 is used for realizing the fixation of the balance piston assembly in the cavity; in the installation process, the locking block 6 and the outer cylinder 8 of the balance piston assembly can be placed in the concave cavity, and the locking block 6 is locked, so that the balance piston assembly can be fixed in the cavity; when the balance piston assembly needs to be disassembled, the locking block 6 can be unlocked, and the balance piston assembly can be freely taken out.
Preferably, in the specific operation of the present invention, an adapter 12 is disposed between the outer cylinder 8 and the balance body 1, and the adapter 12 is used for communicating the second through hole 11 of the outer cylinder 8 and the internal oil path of the balance body 1. In the specific operation, the oil passage communication between the balance body 1 and the outer cylinder 8 can be realized through the adapter 12.
Preferably, in the specific operation of the present invention, the balance body 1 is connected to a ground control device through a control circuit; the balance piston assembly further comprises a sensor, the sensor is used for detecting the oil quantity of the internal oil way of the balance main body 1 and sending a detection signal to the ground control device through the control circuit, and the ground control device is used for monitoring the oil quantity of the internal oil way according to the detection signal.
In a specific operation, the sensor may be a travel switch 10, and the travel switch 10 is disposed inside the outer barrel 8 at a position close to the second through hole 11; by setting the stroke switch 10, whether the current oil amount of the internal oil passage satisfies the work requirement can be detected by the position of the piston 9. When the oil quantity of the internal oil circuit meets the operation requirement, the piston 9 is stabilized at the middle position of the first through hole 13 and the second through hole 11 under the pressure action of the internal oil circuit; when the oil quantity of the internal oil path is reduced, the piston 9 slowly approaches the second through hole 11 under the pressure and elastic force operation of an external slurry column, when the piston 9 touches a travel switch 10 near the second through hole 11, the oil quantity of the internal oil path is in an oil shortage state at the moment, and after the piston 9 touches the travel switch 10, the travel switch 10 sends a signal to be transmitted to a ground control device through a control circuit; the ground control device can timely detect the oil quantity state of the current internal oil way through the detection signal so as to take corresponding measures to avoid major instrument loss caused by oil shortage.
Preferably, in the specific operation of the present invention, the balancing body 1 is internally provided with an eccentric wire passing hole 2, and a signal wire of the control circuit passes through the eccentric wire passing hole 2 and then is connected to the ground control device. In the specific operation, all power supply and signal cables in the balance main body 1 can pass through the eccentric wire passing hole 2 beside the balance piston assembly, so that the balance piston assembly can be quickly disassembled and assembled, and the maintenance operation of the circuit can be reduced to the maximum extent in the operation process.
According to the technical scheme provided by the invention, piston type balance is adopted, and a line bypass passes through a balance piston assembly; the problem of the balanced life-span of leather bag is low can be solved, the shortcoming of poor maintainability of crossing line formula structure also can be avoided simultaneously. Particularly, the balance piston assembly arranged in the concave cavity on the side wall of the balance main body can be used for realizing very convenient disassembly, assembly and maintenance operations, and the disassembly, assembly and maintenance operations can be directly carried out on the outer side of the side wall of the balance main body based on the concave cavity arranged on the side wall of the balance main body without completely disassembling the balance main body, so that the actual operation efficiency can be effectively improved; the setting of accessible spring can guarantee that the inside oil circuit pressure of balanced main part is a little more than mud column pressure all the time, is favorable to guaranteeing hydraulic system safety, reaches balanced effect.
Furthermore, the balance piston assembly can be fixed in the cavity through the arrangement of the locking block; in the installation process, the locking block and the outer cylinder of the balance piston assembly can be placed in the concave cavity, and the locking block is locked, so that the balance piston assembly can be fixed in the cavity; when the balance piston assembly needs to be disassembled, the locking block can be unlocked, and the operation of freely taking out the balance piston assembly can be realized; the oil quantity of the internal oil circuit of the balance main body can be detected through the arrangement of the sensor, so that corresponding measures can be taken conveniently to avoid the major loss of the instrument caused by oil shortage; the setting of the above-mentioned eccentric line hole of crossing of accessible can provide the threading passageway of balanced main part inside all power and signal cables, can realize dismantling fast and install balanced piston assembly, the maintenance operation of reduction circuit that can furthest in operation process.
In the description of the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood by those skilled in the art that the embodiments of the present invention are described above, but the descriptions are only for the purpose of facilitating understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the invention as defined by the appended claims.
Claims (5)
1. A by-pass balance structure of a downhole instrument comprises a balance main body and is characterized in that,
the side wall of the balance main body is provided with a balance piston assembly and an inwards concave cavity for accommodating the balance piston assembly; one side of the balance piston assembly is communicated with an external slurry column, the other side of the balance piston assembly is communicated with an internal oil way of the balance main body, and the balance piston assembly is used for balancing the pressure between the external slurry column and the internal oil way of the balance main body;
the balance piston assembly comprises a piston, a spring connected with the piston and an outer cylinder arranged outside the piston, wherein one end of the outer cylinder is provided with a first through hole communicated with an external slurry column, and the other end of the outer cylinder is provided with a second through hole communicated with the inside of the balance main body; one end of the spring is fixed at the end part of the outer cylinder close to the first through hole, and the other end of the spring is connected with the piston; the urceolus with be provided with the locking piece between the balanced main part, the locking piece sets up between the urceolus is close to the tip of first through-hole and relative cavity tip, the locking piece is used for realizing the fixed of balanced piston assembly in the cavity.
2. A downhole tool bypass balancing structure according to claim 1,
an adapter is arranged between the outer barrel and the balance body and used for communicating a second through hole of the outer barrel and an internal oil way of the balance body.
3. The downhole tool bypass balance structure of claim 1, wherein the balance body is connected to a surface control device through a control circuit;
the balance piston assembly further comprises a sensor, the sensor is used for detecting the oil quantity of the internal oil way of the balance main body and sending a detection signal to the ground control device through the control circuit, and the ground control device is used for monitoring the oil quantity of the internal oil way according to the detection signal.
4. A downhole tool bypass balancing structure according to claim 3,
the sensor is a travel switch, and the travel switch is arranged in the outer barrel at a position close to the second through hole.
5. The bypass type balance structure of the downhole instrument as claimed in claim 3, wherein an eccentric wire passing hole is formed in the balance body, and a signal wire of the control circuit passes through the eccentric wire passing hole and then is connected with the ground control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710333636.1A CN106979003B (en) | 2017-05-09 | 2017-05-09 | Bypass type balance structure of underground instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710333636.1A CN106979003B (en) | 2017-05-09 | 2017-05-09 | Bypass type balance structure of underground instrument |
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| Publication Number | Publication Date |
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| CN106979003A CN106979003A (en) | 2017-07-25 |
| CN106979003B true CN106979003B (en) | 2020-10-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107605430B (en) * | 2017-09-21 | 2019-06-18 | 中国海洋石油集团有限公司 | A kind of well cementation anti-return self balancing device |
| CN117759221B (en) * | 2024-02-21 | 2024-05-03 | 中海油田服务股份有限公司 | Downhole rotating well wall coring control method and system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4979563A (en) * | 1989-10-25 | 1990-12-25 | Schlumberger Technology Corporation | Offset shock mounted recorder carrier including overpressure gauge protector and balance joint |
| CN201635719U (en) * | 2010-02-02 | 2010-11-17 | 中国海洋石油总公司 | Downhole instrument pressure equalizer |
| CN201671621U (en) * | 2010-05-06 | 2010-12-15 | 中国海洋石油总公司 | Balance nipple wire-passing structure |
| CN201943692U (en) * | 2010-07-16 | 2011-08-24 | 大庆石油管理局 | Main measuring housing for measuring instrument while drilling |
| CN202039836U (en) * | 2011-04-07 | 2011-11-16 | 中国海洋石油总公司 | Monitoring type pressure balancer for underground instrument |
| US9010448B2 (en) * | 2011-04-12 | 2015-04-21 | Halliburton Energy Services, Inc. | Safety valve with electrical actuator and tubing pressure balancing |
| CN202103990U (en) * | 2011-06-09 | 2012-01-04 | 中国海洋石油总公司 | Underground insertion installation type circuit framework structure |
| CN202544845U (en) * | 2012-03-28 | 2012-11-21 | 中国海洋石油总公司 | Hydraulic power device for formation drilling while testing instrument |
| CN104935103A (en) * | 2015-06-23 | 2015-09-23 | 华南理工大学 | Motor sealing device of underwater robot and leakage detecting method for motor sealing device |
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