CN109538192B - Downhole tool detection device - Google Patents
Downhole tool detection device Download PDFInfo
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- CN109538192B CN109538192B CN201910015182.2A CN201910015182A CN109538192B CN 109538192 B CN109538192 B CN 109538192B CN 201910015182 A CN201910015182 A CN 201910015182A CN 109538192 B CN109538192 B CN 109538192B
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- downhole tool
- contact
- position detector
- working channel
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- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 238000007789 sealing Methods 0.000 claims description 48
- 230000007246 mechanism Effects 0.000 claims description 44
- 238000004891 communication Methods 0.000 claims description 41
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 230000004308 accommodation Effects 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003345 natural gas Substances 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000002184 metal Substances 0.000 description 4
- 239000002343 natural gas well Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
- E21B47/092—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes by detecting magnetic anomalies
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- 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)
- A Measuring Device Byusing Mechanical Method (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention relates to the technical field of natural gas oil exploitation, and particularly discloses a downhole tool detection device. The downhole tool detection device provided by the embodiment of the invention is used for being connected to a well of an oil and gas well, and the contact head extends into the well. When the downhole tool is moved to the contact head, the downhole tool presses against the contact head, forcing the contact head to move in the direction of the position detector. The contact head is close to the position detector to drive the trigger to be close to the position detector, and the position detector outputs a position detection signal at the moment, so that the position where the downhole tool reaches the downhole tool detection device can be determined according to the position detection signal.
Description
Technical Field
The invention relates to the technical field of natural gas oil exploitation, in particular to a downhole tool detection device.
Background
For downhole tools operating in a well of an oil or gas well (collectively referred to below as an oil or gas well), it may be important to know whether they have reached a certain preset location in the well. In particular, a downhole tool moving in a well by gravity or fluid thrust, knowing whether it has reached a certain preset position in the well is critical to control of an oil and gas well or downhole tool.
However, there is currently a lack of reliable means for detecting whether the downhole tool has reached a certain preset position in the well. Currently, the position of the downhole tool can only be determined empirically in most cases, with low accuracy. In some cases, the position of the downhole tool in the well may also be calculated indirectly from parameters such as fluid pressure within the well, friction between the downhole tool and the well, weight and time of the downhole tool, which also has a problem of low accuracy.
Disclosure of Invention
The invention aims to provide a downhole tool detection device which can detect whether a downhole tool reaches a certain preset position in a well.
The embodiment of the invention is realized by the following technical scheme:
a downhole tool detection apparatus, comprising: a base body, wherein a working channel extending along a preset axis is formed in the base body; a position detector disposed within the working channel; a contact at least partially located outside the working channel and configured to move along a preset axis to approach or depart from the position detector; a reset mechanism configured to apply a reset force to the contact to cause the contact to have a tendency to move away from the position detector; and a trigger coupled to the contact and configured to move with the contact to approach or depart from the position detector; wherein the position detector is configured to output a position detection signal in accordance with a distance between the position detector and the trigger.
Further, the device also comprises a containing mechanism arranged in the working channel, wherein the containing mechanism comprises a containing head and a communication tube connected with the containing head; an accommodating space is formed in the accommodating head; the communication pipe is connected with the accommodating head, and the inner space of the communication pipe is communicated with the accommodating space; the communication tube extends to the outside of the matrix along a preset axis; the position detector is disposed in the accommodation space.
Further, the containment head comprises an inner sleeve and an outer sleeve; the inner sleeve is provided with an open end and a closed end which are opposite; the closed end of the inner sleeve is communicated with the communication pipe; the inner sleeve defines an accommodation space; the outer sleeve is provided with an open end and a closed end which are opposite; the outer sleeve is in threaded connection with the inner sleeve, and the closed end of the outer sleeve is opposite to the open end of the inner sleeve.
Further, the accommodating mechanism can be arranged in the working channel in a sliding way along a preset axis; a shaft sealing mechanism is arranged between the communication pipe and the inner wall of the working channel.
Further, the shaft sealing mechanism comprises a first limiting ring and a second limiting ring which are protruded inwards from the inner wall of the working channel in the radial direction; the first limiting ring and the second limiting ring are penetrated by the communication pipe; the shaft sealing mechanism further comprises a sealing sleeve, an elastic sleeve and a spring which are arranged between the first limiting ring and the second limiting ring; the sealing sleeve is sleeved on the communication tube in a sliding manner; one end of the sealing sleeve, which is close to the first limiting ring, protrudes outwards in the radial direction to form a contact ring; the elastic sleeve is sleeved on the sealing sleeve; one end of the spring is abutted against the second limiting ring; the other end of the spring acts on the elastic sleeve to enable the elastic sleeve to be clung to the contact ring, and enable the contact ring to be clung to the first limiting ring; the outer peripheral surface of the elastic sleeve is contacted with the inner wall of the working channel; the inner peripheral surface of the elastic sleeve is contacted with the outer peripheral surface of the sealing sleeve; the inner peripheral surface of the sealing sleeve is in contact with the outer peripheral surface of the communication tube.
Further, an annular groove surrounding a preset axis is formed in the surface of the contact head; a plurality of balls are arranged in the annular groove; a mounting ring is embedded in the annular groove; the mounting ring is provided with through holes corresponding to the balls one by one; a part of the ball is exposed out of the annular groove through the through hole.
Further, a pressure relief channel is formed in the contact head and penetrates through the contact head.
Further, the downhole tool detection device further comprises a guide rod, and a third limiting ring is arranged in the working channel; one end of the guide rod is connected with the contact head; the other end of the guide rod penetrates through the third limiting ring; one end of the guide rod, which is far away from the contact, protrudes radially outwards to form a limit flange, and the limit flange is configured to be abutted against the third limit ring.
Further, the reset mechanism is a spring sleeved on the guide rod; one end of the reset mechanism is propped against the contact head, and the other end of the reset mechanism is propped against the third limiting ring.
Further, the trigger is a magnet and the position detector is a magnetic proximity sensor.
The technical scheme of the invention has at least the following advantages and beneficial effects:
the downhole tool detection device provided by the embodiment of the invention is used for being connected to a well of an oil and gas well, and the contact head extends into the well. When the downhole tool is moved to the contact head, the downhole tool presses against the contact head, forcing the contact head to move in the direction of the position detector. The contact head is close to the position detector to drive the trigger to be close to the position detector, and the position detector outputs a position detection signal at the moment, so that the position where the downhole tool reaches the downhole tool detection device can be determined according to the position detection signal.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the following description will briefly explain the drawings that need to be used in the embodiments. It is appreciated that the following drawings depict only certain embodiments of the invention and are not therefore to be considered limiting of its scope. Other figures can be obtained from these figures without inventive effort for the person skilled in the art.
FIG. 1 is a schematic diagram of an external structure of a downhole tool detection apparatus according to an embodiment of the present invention;
FIG. 2 is a first operational state diagram of a downhole tool detection apparatus according to an embodiment of the present invention;
FIG. 3 is a second operational state diagram of a downhole tool detection apparatus according to an embodiment of the present invention;
fig. 4 is a third working state diagram of the downhole tool detection device according to the embodiment of the invention.
In the figure: 010-downhole tool detection means; 110-matrix; 110 a-a preset axis; 111-working channel; 120-contacts; 121-an annular groove; 122-balls; 123-mounting ring; 124-through holes; 125-pressure relief channel; 130-a reset mechanism; 140-a guide bar; 141-a limit flange; 153-a third stop collar; 160-a trigger; 170-a position detector; 180-accommodating the head; 180 a-accommodation space; 181-inner sleeve; 182-outer sleeve; 190-communication tube; 191-limiting sheets; 200-a sealing mechanism; 201-a first limiting ring; 202-a second limiting ring; 203-sealing sleeve; 204-elastic sleeve; 205-spring; 206-contact ring; 207-metal ring; 210-limiting tube; 211-limiting channels; 212-limit grooves.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", "front", "rear", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in place when the inventive product is used, or are directions or positional relationships conventionally understood by those skilled in the art, such terms are merely for convenience of describing the present invention and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention.
In the description of the present invention, a "natural gas well" may be a natural gas well for the production of conventional natural gas or a natural gas well for the production of unconventional natural gas (shale gas, coalbed gas, etc.).
Example 1:
fig. 1 is a schematic diagram of the external structure of a downhole tool detection apparatus 010 according to the present embodiment. Fig. 2 is a first working state diagram of the downhole tool detection apparatus 010 according to the present embodiment. Fig. 3 is a second operational state diagram of the downhole tool detection apparatus 010 according to the present embodiment. Fig. 4 is a third working state diagram of the downhole tool detection apparatus 010 according to the present embodiment.
Please refer to fig. 1-4 in combination. The downhole tool detection apparatus 010 provided in this embodiment includes a base 110. The base 110 has a cylindrical structure extending along a predetermined axis 110 a. External threads are provided on the outer circumferential surface of the base 110 so that the base 110 can be screwed to the hydrocarbon well. The base 110 is provided with a working channel 111 extending along a predetermined axis 110 a. In the present embodiment, both ends of the working channel 111 are defined as a front end and a rear end, respectively, and both the front end and the rear end of the working channel 111 are open, so that the working channel 111 communicates with the outside without sealing measures. The working channel 111 is circular in cross-section.
The downhole tool detection apparatus 010 provided by this embodiment further comprises a contact head 120. In this embodiment, the front end of the contact 120 is hemispherical, and the rear end of the contact 120 is cylindrical. The hemispherical front end of the contact head 120 is for contact with a downhole tool. The contact 120 is configured to move along a preset axis 110 a. In this embodiment, the contact head 120 is located entirely outside the working channel 111 so that the front end of the contact head 120 contacts the downhole tool. In other embodiments, only the tip of the contact 120 or a part of the tip of the contact 120 may be located outside the working channel 111.
The downhole tool detection apparatus 010 provided by this embodiment further comprises a reset mechanism 130. The reset mechanism 130 is configured to apply a reset force to the contact 120 to move the contact 120 forward. When the contact head 120 is pressed by the downhole tool, it is able to move rearward against the restoring force exerted by the restoring mechanism 130. The downhole tool detection apparatus 010 provided by this embodiment further comprises a guide bar 140. A third retainer ring 153 is provided at the front end of the working channel 111. The third limiting ring 153 enters the front end of the working channel 111 in the front-to-rear direction through the direction of the screw connection and is fixedly connected with the working channel 111. The front end of the guide rod 140 is in threaded connection with the rear end of the contact 120, and the rear end of the guide rod 140 slidably penetrates the third limiting ring 153. The rear end of the guide bar 140 protrudes radially outwardly to form a limit flange 141. The limit flange 141 is configured to abut the third limit ring 153 to prevent the contact 120 from continuing to move forward, i.e., when the limit flange 141 abuts the third limit ring 153, the contact 120 moves forward to the limit position. In this embodiment, the reset mechanism 130 is a spring, the front end of which abuts against the rear end of the contact 120, and the rear end of which abuts against the third limiting ring 153. The reset mechanism 130 is in a compressed state and applies a reset force to the contact 120. In other embodiments, the reset mechanism 130 may be implemented in other configurations, so long as it is capable of providing a continuous reset force to the contacts 120. For example, the reset mechanism 130 is two magnets with the same poles opposite to each other, and the two magnets are respectively arranged on the contact 120 and the third limiting ring 153, and the repulsive force of the two magnets constitutes a reset force applied to the contact 120.
The downhole tool detection apparatus 010 provided by this embodiment further comprises a trigger 160. The trigger 160 is connected to the contact 120 to move in the front-rear direction with the contact 120. Specifically, the trigger 160 is disposed at the rear end of the guide bar 140. A trigger hole is opened at the rear end of the guide bar 140, and a trigger 160 is fixed in the trigger hole.
The downhole tool detection apparatus 010 provided by this embodiment further comprises a position detector 170. The position detector 170 is disposed within the working channel 111. The position detector 170 is used to detect the trigger 160. As the trigger 160 moves rearward with the contact 120, the distance between the trigger 160 and the position detector 170 decreases. As the trigger 160 moves forward with the contact 120, the distance between the trigger 160 and the position detector 170 increases. The position detector 170 outputs a position detection signal according to a distance between the position detector and the trigger 160. In this embodiment, when the position contact 120 moves forward to a limit, the position detector 170 cannot detect the trigger 160, and the position detector 170 outputs a low level (as shown in fig. 2). When the contact head 120 is moved backward a certain distance by the extrusion of the downhole tool, the position detector 170 detects the trigger 160, outputting a high level (as shown in fig. 3). The high level is the position detection signal. When the position detection signal is detected, the position at which the downhole tool arrives at the downhole tool detection device 010 can be determined. Thus, detection of the position of the downhole tool is achieved. In this embodiment, the trigger 160 is a magnet and the position detector 170 is a magnetic proximity sensor. In other embodiments, the position detector 170 may also employ a micro switch, and the position detector 170 outputs a high level when the trigger 160 is in contact with the position detector 170.
Since the downhole tool detection apparatus 010 provided in this embodiment is in use, the contact head 120 needs to extend into the well of the oil and gas well, which results in fluid in the oil and gas well being able to enter the working channel 111, possibly affecting the proper operation of the position detector 170. For this purpose, the sealing of the position detector 170 needs to be considered. Thus, in this embodiment, the downhole tool detection apparatus 010 further comprises a receiving mechanism comprising a receiving head 180 and a communication tube 190. The accommodating head 180 has an accommodating space 180a formed therein, and the position detector 170 is disposed in the accommodating space 180a. The accommodation space 180a is not in communication with the working channel 111. The accommodating head 180 is connected to the front end of the communication pipe 190, and the inner space of the communication pipe 190 communicates with the accommodating space 180a. The communication tube 190 extends from the rear end of the working channel 111 to the outside of the working channel 111. The position detector 170 is provided in the accommodation head 180, which solves the sealing problem of the position detector 170, so that the position detector 170 can stably operate. The communication tube 190 can accommodate a communication cable connected to the position detector 170 so that the position detection signal of the position detector 170 can be stably transmitted.
Further, in the present embodiment, the containment head 180 includes an inner sleeve 181 and an outer sleeve 182. The front end of the inner sleeve 181 is an open end, and the rear end of the inner sleeve 181 is a closed end. The space defined by the inner sleeve 181 is the accommodating space 180a. The closed end of the inner sleeve 181 is connected to a communication tube 190. The front end of the outer sleeve 182 is a closed end, and the rear end of the outer sleeve 182 is an open end. The outer sleeve 182 is threadedly coupled to the inner sleeve 181, and the closed end of the outer sleeve 182 faces the open end of the inner sleeve 181. A sealing ring is also provided between the inner surface of the outer sleeve 182 and the outer surface of the inner sleeve 181. In this way, a convenient assembly and an effective sealing is achieved.
The receiving mechanism may be disposed in the working channel 111, and the communication tube 190 may be fixedly connected to the rear end of the base 110 by welding or screwing, so that the rear end of the working channel 111 may be sealed. In the present embodiment, the housing mechanism is slidably disposed in the working channel 111 along the preset axis 110 a. Thus, when the accommodating mechanism moves forward along the preset axis 110a for a certain distance, the accommodating head 180 can abut against the rear end of the guide rod 140, thereby preventing the contact head 120 from moving backward. When the downhole tool moves to the position where the downhole tool detection device 010 is located and remains in that position, the receiving mechanism may be moved forward along the preset axis 110a until the receiving head 180 abuts against the rear end of the guide rod 140, such that the contact head 120 cannot move backward, and thus capture of the downhole tool may be achieved, and the downhole tool may be positioned at the position where the downhole tool detection device 010 is located. For example, when the downhole tool is a plunger, the downhole tool detection device 010 is positioned slightly above the production tubing at the wellhead. And the plunger is moved upward in the open state. When the lower end of the plunger reaches a position slightly higher than the production pipeline, fluid in a well below the plunger enters the production pipeline, the pressure of the fluid below the plunger is reduced, the thrust of the fluid received by the plunger is reduced, and the plunger moves downwards to block the inlet of the production pipeline. At this time, the fluid pressure below the plunger increases, and the fluid thrust exerted by the plunger increases, so that the plunger moves upward, exposing the inlet of the production pipe. In this way, the plunger can dynamically stay in position near the production tubing. During this process, the plunger presses the contact head 120 to move it rearward. The trigger 160 approaches the position detector 170, and the position detector 170 outputs a position detection signal. At this time, the accommodating mechanism may be moved forward along the preset axis 110a until the accommodating head 180 abuts against the rear end of the guide bar 140, so that the contact head 120 cannot be moved backward (as shown in fig. 4), which can achieve capturing of the plunger, and positioning the plunger at its current position. After shut-in, the upward fluid thrust experienced by the plunger is reduced or eliminated, and the plunger can still be held in place by the downhole tool detection device 010, at which point the plunger can be safely removed or otherwise manipulated. Since the housing mechanism is required to slide back and forth along the preset axis 110a, a shaft seal mechanism 200 is required to be provided between the communication pipe 190 and the inner wall of the working channel 111 in the present embodiment to form a good dynamic seal between the communication pipe 190 and the inner wall of the working channel 111.
The shaft seal mechanism 200 includes a first stop collar 201 and a second stop collar 202 projecting radially inwardly from the inner wall of the working channel 111. The first stop collar 201 and the second stop collar 202 are slidably penetrated by the communication tube 190. The shaft seal mechanism 200 further includes a sealing sleeve 203, an elastic sleeve 204, and a spring 205 disposed between the first stop collar 201 and the second stop collar 202. The sealing sleeve 203 is sleeved on the communication pipe 190, and one end of the sealing sleeve 203, which is close to the first limiting ring 201, protrudes radially outwards to form a contact ring 206. The elastic sleeve 204 is sleeved on the sealing sleeve 203. The spring 205 is sleeved on the communication pipe 190, one end of the spring 205 abuts against the second limiting ring 202, and the other end of the spring 205 acts on the end of the elastic sleeve 204. The spring 205 is always in a compressed state, and the spring 205 applies an elastic force to the elastic sleeve 204 along the axial direction, so that the elastic sleeve 204 drives the sealing sleeve 203 to move towards the first limiting ring 201, and finally the contact ring 206 is tightly attached to the first limiting ring 201 to form a seal. Under the axial force applied by the spring 205, the elastic sleeve 204 is deformed in the radial direction, so that the outer peripheral surface of the elastic sleeve 204 is abutted against the inner wall of the working channel 111, while the inner peripheral surface of the elastic sleeve 204 is abutted against the outer peripheral surface of the sealing sleeve 203 and applies a radially inward pressure to the sealing sleeve 203. The radially inward pressure applied by the elastic sleeve 204 to the sealing sleeve 203 enables the inner peripheral surface of the sealing sleeve 203 to abut against the outer peripheral surface of the communication tube 190. The above structure realizes the sealing between the outer peripheral surface of the elastic sleeve 204 and the inner wall of the working channel 111, the sealing between the inner peripheral surface of the elastic sleeve 204 and the sealing sleeve 203, and the sealing between the inner peripheral surface of the sealing sleeve 203 and the communication pipe 190. In this way, the sealing between the communication pipe 190 and the inner wall of the working channel 111 is realized, and the occurrence of leakage of the downhole tool detection device 010 is avoided.
Further, in the present embodiment, the elastic sleeve 204 is made of rubber. Still further, the elastomeric sleeve 204 includes a plurality of rubber rings that are independent of each other and are disposed side-by-side. The plurality of rubber rings are in close contact with each other under the axial force exerted by the spring 205. Under the action of the axial force applied by the spring 205, each rubber ring is radially deformed independently, so that the sealing sleeve 203 can be ensured to be subjected to relatively uniform radial pressure in all axial directions, and the sealing performance between the sealing sleeve 203 and the communication pipe 190 is improved.
Further, the sealing sleeve 203 may be made of polytetrafluoroethylene or nylon, and in this embodiment, the sealing sleeve 203 is made of polytetrafluoroethylene.
Further, in the present embodiment, the shaft sealing mechanism 200 further includes a metal ring 207 disposed between the elastic sleeve 204 and the spring 205; the metal ring 207 is sleeved on the sealing sleeve 203. The elastic force of the spring 205 acts on the elastic sleeve 204 through the metal ring 207, so that the elastic sleeve 204 can be subjected to more uniform axial force, which helps to increase the service life of the elastic sleeve 204.
During operation of the downhole tool detection apparatus 010, pressurized fluid within the well may enter the working channel 111 through the gap between the guide rod 140 and the third stop collar 153. The pressurized fluid within the working channel 111 exerts a rearward pushing force on the containment head 180 and, in the absence of other external forces, the containment head 180 will move rearward until it abuts the second stop collar 202. At this time, the position of the position detector 170 does not change. The contact head 120 is pressed back by the downhole tool such that the trigger 160 is adjacent to the position detector 170. When the position detector 170 detects the rear trigger 160, the position detector 170 outputs a position detection signal. The position where the downhole tool reaches the downhole tool detection device 010 is known from the position detection signal. If it is desired to capture the downhole tool at this point, a forward force is applied to the communication tube 190 to move the containment mechanism forward a distance along the predetermined axis 110a until the containment head 180 abuts the rear end of the guide rod 140, thereby preventing the contact head 120 from moving rearward to capture the downhole tool. The forward force may be applied to the communication tube 190 by a driving means (e.g., a motor, a hydraulic cylinder, a pneumatic cylinder, or the like), or the forward force may be applied to the communication tube 190 by a manual force. In the present embodiment, the rear end of the base 110 is provided with a limiting tube 210, and a limiting channel 211 extending in the front-rear direction is formed in the limiting tube 210. The rear end of the limiting channel 211 is open, and the front end of the limiting channel 211 is provided with a limiting groove 212 extending along the circumferential direction. A stopper 191 is provided at the rear end of the communication pipe 190. The stopper piece 191 penetrates the stopper passage 211 in the radial direction. When the downhole tool needs to be captured, the limiting piece 191 is pushed to move forwards along the limiting channel 211, so that the accommodating mechanism is driven to move forwards along the preset axis 110a to a position propped against the guide rod 140. The stop tab 191 is then rotated such that the stop tab 191 engages the stop recess 212 to prevent rearward movement of the receiving mechanism.
Further, in the present embodiment, the rear end of the contact 120 is provided with an annular groove 121 surrounding the preset axis 110a, and a plurality of balls 122 are provided in the annular groove 121. A mounting ring 123 is fitted into the opening of the annular groove 121. The mounting ring 123 is provided with through holes 124 corresponding to the balls 122 one by one. A part of the ball 122 is exposed to the outside of the annular groove 121 through the through hole 124. The portion of the balls 122 exposed to the outside of the annular groove 121 projects radially outwardly relative to the contact 120. The balls 122 are adapted to be in rolling contact with the inner wall of the passage in which the downhole tool detection apparatus 010 is installed, so that the contact head 120 can smoothly move back and forth along the preset axis 110 a.
Because the contact 120 needs to extend into the well, the pressure in the well is high, especially in the oil and gas well production state, the pressure in the well may make the contact 120 unable to move forward into the well, which eventually results in an inability to accurately detect whether the downhole tool reaches the location of the downhole tool detection device 010. For this purpose, in the present embodiment, the contact 120 is provided with a pressure relief channel 125. A pressure relief passage 125 extends through the contact head 120. The pressure relief channel 125 extends from the front end of the contact 120 to the rear end of the contact 120. The pressure relief channel 125 can allow fluid in the hoistway to flow to the rear end of the contact 120, so that the contact 120 is pressure balanced from front to back, thus ensuring that the contact 120 can move forward into the hoistway under the action of the reset mechanism 130.
The downhole tool detection device provided by the embodiment of the invention is used for being connected to a well of an oil and gas well, and the contact head extends into the well. When the downhole tool is moved to the contact head, the downhole tool presses against the contact head, forcing the contact head to move in the direction of the position detector. The contact head is close to the position detector to drive the trigger to be close to the position detector, and the position detector outputs a position detection signal at the moment, so that the position where the downhole tool reaches the downhole tool detection device can be determined according to the position detection signal.
The above description is only a few embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Downhole tool detection device, its characterized in that includes:
the base body is provided with a working channel extending along a preset axis;
a position detector disposed within the working channel;
a contact head located at least partially outside the working channel and configured to move along the preset axis to be closer to or farther from the position detector;
a reset mechanism configured to apply a reset force to the contact head to cause the contact head to have a tendency to move away from the position detector; and
a trigger coupled to the contact and configured to move with the contact to approach or depart from the position detector;
wherein the position detector is configured to output a position detection signal according to a distance between the position detector and the trigger;
the device also comprises a containing mechanism arranged in the working channel, wherein the containing mechanism comprises a containing head and a communication pipe connected with the containing head; an accommodating space is formed in the accommodating head; the communication pipe is connected with the accommodating head, and the inner space of the communication pipe is communicated with the accommodating space; the communication tube extends out of the base body along the preset axis; the position detector is arranged in the accommodating space;
the containing head comprises an inner sleeve and an outer sleeve;
the inner sleeve is provided with an open end and a closed end which are opposite; the closed end of the inner sleeve is communicated with the communication pipe; the inner sleeve defines the accommodation space;
the outer sleeve is provided with an open end and a closed end which are opposite; the outer sleeve is in threaded connection with the inner sleeve, and the closed end of the outer sleeve is opposite to the open end of the inner sleeve;
the accommodating mechanism can be slidably arranged in the working channel along the preset axis;
a shaft sealing mechanism is arranged between the communication pipe and the inner wall of the working channel;
the shaft sealing mechanism comprises a first limiting ring and a second limiting ring which are protruded inwards from the inner wall of the working channel in the radial direction; the first limiting ring and the second limiting ring are penetrated by the communication pipe; the shaft sealing mechanism further comprises a sealing sleeve, an elastic sleeve and a spring, wherein the sealing sleeve, the elastic sleeve and the spring are arranged between the first limiting ring and the second limiting ring; the sealing sleeve is slidably sleeved on the communication pipe; one end of the sealing sleeve, which is close to the first limiting ring, protrudes outwards in the radial direction to form a contact ring; the elastic sleeve is sleeved on the sealing sleeve; one end of the spring is abutted against the second limiting ring; the other end of the spring acts on the elastic sleeve to enable the elastic sleeve to be clung to the contact ring, and enable the contact ring to be clung to the first limiting ring;
the outer peripheral surface of the elastic sleeve is in contact with the inner wall of the working channel; the inner peripheral surface of the elastic sleeve is contacted with the outer peripheral surface of the sealing sleeve; the inner peripheral surface of the sealing sleeve is in contact with the outer peripheral surface of the communication tube.
2. The downhole tool detection apparatus of claim 1, wherein:
an annular groove surrounding the preset axis is formed in the surface of the contact head; a plurality of balls are arranged in the annular groove; a mounting ring is embedded in the annular groove; the mounting ring is provided with through holes which are in one-to-one correspondence with the balls; a part of the ball is exposed out of the annular groove through the through hole.
3. The downhole tool detection apparatus of claim 1, wherein:
the pressure relief channel is formed in the contact head and penetrates through the contact head.
4. The downhole tool detection apparatus of claim 1, wherein:
the downhole tool detection device further comprises a guide rod, and a third limiting ring is arranged in the working channel; one end of the guide rod is connected with the contact head; the other end of the guide rod penetrates through the third limiting ring; and one end of the guide rod, which is far away from the contact head, protrudes radially outwards to form a limit flange, and the limit flange is configured to be abutted with the third limit ring.
5. The downhole tool detection apparatus of claim 4, wherein:
the reset mechanism is a spring sleeved on the guide rod; one end of the reset mechanism is propped against the contact head, and the other end of the reset mechanism is propped against the third limiting ring.
6. The downhole tool sensing device of any of claims 1-5, wherein:
the trigger is a magnet and the position detector is a magnetic proximity sensor.
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| CN201910015182.2A CN109538192B (en) | 2019-01-08 | 2019-01-08 | Downhole tool detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109869118A (en) * | 2019-04-15 | 2019-06-11 | 成都百胜野牛科技有限公司 | Conduction device and wellhead assembly |
| CN113539712B (en) * | 2021-05-21 | 2023-05-05 | 阳泉华盛矿用设备厂有限公司 | Switch with detectable contact state |
| CN113898321A (en) * | 2021-11-16 | 2022-01-07 | 成都百胜野牛科技有限公司 | Natural gas well fluid separator |
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