CN111335881B - Plunger with downhole arrival determination function - Google Patents

Plunger with downhole arrival determination function Download PDF

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Publication number
CN111335881B
CN111335881B CN201811460113.4A CN201811460113A CN111335881B CN 111335881 B CN111335881 B CN 111335881B CN 201811460113 A CN201811460113 A CN 201811460113A CN 111335881 B CN111335881 B CN 111335881B
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China
Prior art keywords
plunger
cylinder
downhole
outer cylinder
connecting piece
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CN201811460113.4A
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Chinese (zh)
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CN111335881A (en
Inventor
陈家晓
叶长青
熊杰
陈珂
朱昆
唐胡琼
安俞蓉
段蕴琦
王庆蓉
周玮
林生茂
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Petrochina Co Ltd
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Petrochina Co Ltd
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Priority to CN201811460113.4A priority Critical patent/CN111335881B/en
Publication of CN111335881A publication Critical patent/CN111335881A/en
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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
    • 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
    • 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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/122—Gas lift
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

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  • 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)
  • Earth Drilling (AREA)

Abstract

The invention discloses a plunger with a downhole arrival judging function, which comprises the following components: the plunger comprises a plunger body (1) and a counting device (2), wherein the counting device (2) comprises an outer cylinder (21), an elastic buffer device (22), an impact head (23), a connecting piece (24) and a guide pin (25), the guide pin (25) is fixed in the outer cylinder (21), one end of the connecting piece (24) is movably arranged in the outer cylinder (21), a slideway (241) for moving the guide pin (25) is arranged on the outer wall, and the slideway (241) is used for converting the movement of the guide pin (25) from vertical up-down movement to upward-downward movement on the right side; the elastic buffer device (22) is positioned in the outer cylinder (21); the striking head (23) is connected with the other end of the connecting piece (24); the outer cylinder (21) is provided with a through hole (211) for displaying an identification symbol (242) on the connecting piece (24); the plunger body (1) is connected with the outer cylinder (21). The plunger may be configured to determine whether it has reached the detent position.

Description

Plunger with downhole arrival determination function
Technical Field
The invention relates to the technical field of oilfield gas production engineering, in particular to a plunger with an underground arrival judging function.
Background
In gas field development, plunger gas lift is a common artificial lifting mode, and the plunger is used as a solid interface between liquid and gas, so that slip loss between the liquid and the gas in a shaft can be reduced, slip between the liquid and the gas is reduced, and lifting efficiency is improved. The retainer is one of main matched tools of a plunger gas lift process, is normally thrown into the well by using a steel wire operation in a plunger gas lift well, plays a limiting role on the downward movement of a plunger, and can enable the plunger to be lowered below the liquid level. Thus, determining whether the plunger has reached the detent position is particularly important for plunger gas lift.
At present, conventional plungers include brush type plungers, fishbone type plungers or spring block type plungers, and although the plungers can separate liquid and gas in a shaft, whether the plunger falls to the position of a locking device cannot be judged.
Disclosure of Invention
In view of the above, the invention provides a plunger with a downhole reaching judgment function, which not only can realize lifting of liquid in a normal production process, but also can realize judgment of whether the plunger reaches the position of a clamp.
Specifically, the method comprises the following technical scheme:
a plunger having a downhole arrival determination function, the plunger comprising: a plunger body and a counting device, wherein,
the counting device comprises an outer cylinder, an elastic buffer device, an impact head, a connecting piece and a guide pin, wherein the guide pin is fixed on the inner wall of the outer cylinder, one end of the connecting piece is movably arranged in a cylinder cavity of the outer cylinder, a slideway for supplying and limiting the movement of the guide pin is arranged on the outer wall of the connecting piece, and the slideway is used for converting the movement of the guide pin from vertical up-down movement to upward-downward movement on the right side of the slant; the elastic buffer device is positioned in the cylinder cavity of the outer cylinder, and one end of the elastic buffer device is sleeved on the connecting piece; the impact head is connected with the other end of the connecting piece and is positioned outside the outer cylinder; the connecting piece positioned at one side of the slideway is provided with an identification symbol, and the outer cylinder is provided with a through hole for displaying the identification symbol;
the plunger body is connected with the upper end of the outer barrel, and the other end of the elastic buffer device is abutted against the plunger body.
In one possible design, the connector includes a first portion and a second portion that are connected;
the first part is of a cylinder structure with a cylinder arranged inside, the slide way is arranged on the outer wall of the first part, and the elastic buffer device is sleeved on the cylinder;
the second part is of a cylinder structure and is connected with the impact head;
the first part is movably arranged in the cylinder cavity of the outer cylinder, the second part is positioned outside the outer cylinder, and the cylinder diameter of the second part is smaller than that of the first part.
In one possible design, the outer wall of the first portion has a plurality of first unidirectional teeth and a plurality of second unidirectional teeth, the slideway being formed between the plurality of first unidirectional teeth and the plurality of second unidirectional teeth;
each first unidirectional tooth and each second unidirectional tooth face opposite to each other, and each first unidirectional tooth is correspondingly arranged between every two adjacent second unidirectional tooth blocks.
In one possible design, the plurality of first unidirectional teeth and the plurality of second unidirectional teeth rings are provided on an outer wall of the first portion.
In one possible design, the number of the identification symbols is at least two;
each identification symbol is arranged on the tooth block of the first unidirectional tooth or the tooth block of the second unidirectional tooth in a one-to-one correspondence.
In one possible design, the impact head includes a connecting portion and an impact portion that are connected;
the connecting part is of a cylindrical structure, is inserted into a cylinder cavity of the cylinder body where the second part is positioned, and is connected with the second part;
the impact part is of a truncated cone structure.
In one possible design, the second portion is provided with an internal thread section on its inner wall, and the connecting portion is provided with an external thread section on its outer wall, the external thread section being adapted to cooperate with the internal thread section.
In one possible design, the second portion is provided with a threaded hole, through which a set screw passes and abuts against the connecting portion.
In one possible design, the number of through holes is at least one.
In one possible design, the identification symbol is a number.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
1. the plunger with the underground arrival judging function is put into the well from the oil pipe, when the impact head impacts the clamping device in the well, the impact head can drive the connecting piece to move upwards, the elastic buffer device is continuously compressed, at the moment, the guide pin can move downwards along the slide way which is provided with the outer wall of the connecting piece and limits the movement of the guide pin because of the mutual movement between the connecting piece and the outer barrel, and the slide way is used for converting the movement of the guide pin from vertical up-down movement to the up-down movement on the inclined right side, so that the guide pin moves rightwards and downwards along the slide way, and the outer barrel and the connecting piece rotate; after the impact head impacts the clamp, the plunger body moves upwards due to the upward pushing action of underground fluid, the elastic buffer device is continuously reset, the guide pin moves upwards right along the slideway, and the outer barrel and the connecting piece continue to rotate in the same direction until the elastic buffer device is reset, so that one impact counting is realized; by lifting the plunger up from the well and observing the change of the identification symbol on the connector displayed in the through hole on the outer barrel, the judgment on whether the plunger reaches the position of the fastener can be realized;
2. because the plunger body can play a role in lifting liquid, the plunger with the underground arrival judging function can also lift liquid in a normal production process, and can be used in normal production operation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a plunger with a downhole reaching determination function according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a slide way of a plunger with a downhole reaching determination function according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a movement path of a guide pin of a plunger with a downhole reaching determination function in a single impact counting process according to an embodiment of the present invention.
Reference numerals in the drawings are respectively expressed as:
1-a plunger body, wherein the plunger body is provided with a plurality of grooves,
an 11-salvaging head, wherein the salvaging head is provided with a plurality of salvaging holes,
a 12-connecting head, wherein the connecting head is provided with a connecting hole,
13-a central rod, which is arranged on the bottom of the container,
14-a fish skeleton, wherein the fish skeleton,
a 2-counter device, which is used for counting the number of the objects,
21-an outer cylinder, 211-a through hole,
a 22-elastic buffer device, which is arranged on the upper surface of the substrate,
23-strike head, 231-connect, 232-strike,
24-connector, 241-slide, 242-identifier, 243-first portion, 2432-first one-way tooth, 2433-second one-way tooth, 244-second portion, 2441-threaded hole,
25-guide pins.
Specific embodiments of the present invention have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Before describing the embodiments of the present invention in further detail, terms of orientations, such as "vertical," "up-down," "inclined to the right," and "upper end" in the embodiments of the present invention, are all based on the orientations shown in fig. 1, and are merely used to clearly describe the structure of the plunger with the downhole reaching determination function in the embodiments of the present invention, and are not meant to limit the scope of the present invention.
In order to make the technical scheme and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a plunger with a downhole arrival determination function, the structural schematic diagram of which is shown in fig. 1, the plunger comprises: a plunger body 1 and a counting device 2.
The counting device 2 comprises an outer cylinder 21, an elastic buffer device 22, an impact head 23, a connecting piece 24 and a guide pin 25, wherein the guide pin 25 is fixed on the inner wall of the outer cylinder 21, one end of the connecting piece 24 is movably arranged in a cylinder cavity of the outer cylinder 21, a slideway 241 for supplying and limiting the movement of the guide pin 25 is arranged on the outer wall of the connecting piece 24, and the slideway 241 is used for converting the movement of the guide pin 25 from vertical up-down movement to upward-downward movement on the right side; the elastic buffer device 22 is positioned in the cylinder cavity of the outer cylinder 21, and one end of the elastic buffer device is sleeved on the connecting piece 24; the impact head 23 is connected with the other end of the connecting piece 24 and is positioned outside the outer cylinder 21; the connecting piece 24 positioned on one side of the slide way 241 is provided with an identification symbol 242, and the outer cylinder 21 is provided with a through hole 211 for displaying the identification symbol 242;
the plunger body 1 is connected to the upper end of the outer tube 21, and the other end of the elastic buffer 22 abuts against the plunger body 1.
It will be appreciated that one end of the connector 24 is snapped into the cavity of the outer barrel 21, the guide pin 25 is always located in the slideway 241 and the resilient cushioning element 22 is in an uncompressed or slightly compressed state.
The following describes the working principle of the plunger with the downhole reaching determination function provided by the embodiment of the invention:
the plunger with the underground arrival judging function is put into the oil pipe at the wellhead;
when the impact head 23 impacts the fastener in the well, the impact head 23 can drive the connecting piece 24 to move upwards, the elastic buffer device 22 is continuously compressed, at the moment, the guide pin 25 can move downwards along the slideway 241 which is arranged on the outer wall of the connecting piece 24 and is used for supplying and limiting the movement of the connecting piece 24, and the slideway 241 is used for converting the movement of the guide pin 25 from vertical up-down movement to upward-downward movement on the right side, so that the guide pin 25 moves downwards right along the slideway 241, and the outer barrel 21 and the connecting piece 24 rotate;
after the impact head 23 impacts the fastener, the plunger body 1 moves upwards due to the upward pushing action of underground fluid, the elastic buffer device 22 is continuously reset, the guide pin 25 moves upwards to the right along the slideway 241, so that the outer cylinder 21 and the connecting piece 24 continue to rotate in the same direction until the elastic buffer device 22 is reset, and one impact counting is realized;
the plunger is lifted up to the wellhead by the lifting action of the fluid in the well, the surface is taken out after the plunger is caught by the catcher of the wellhead, and whether the plunger reaches the catcher position is determined by observing the change of the identification symbol 242 on the connecting piece 24 displayed in the through hole 211 on the outer cylinder 21.
Therefore, the plunger with the underground arrival judging function according to the embodiment of the invention utilizes the plunger body 1 and the counting device 2, the impact head 23 impacts the fastener in the well through the impact head 23, so that the impact head 23 drives the connecting piece 24 to move, the connecting piece 24 and the outer barrel 21 rotate under the limiting effect of the guide pin 25 fixed on the outer barrel 21 and the elastic buffering effect of the elastic buffering device 22, the identification symbol 242 observed through the through hole 211 changes, the judgment on whether the plunger arrives at the fastener position can be realized by utilizing the change of the identification symbol 242, and meanwhile, the plunger body 1 can lift liquid, so that the plunger can lift liquid in the normal production process and can be used for normal production operation.
The following describes in detail a plunger having a downhole reaching determination function according to an embodiment of the present invention:
for the plunger body 1, the plunger body 1 can move towards the wellhead under the pushing action of underground fluid, so that the lifting of liquid in the well is realized.
In one possible embodiment, as shown in fig. 1, the plunger body 1 includes a fishing head 11, a connector 12, a center rod 13, and a fish skeleton 14.
Wherein, the fishing head 11, the connector 12, the center rod 13 and the fish skeleton 14 are integrally formed.
By arranging the salvaging head 11, the plunger is convenient to salvage; by arranging the connector 12, the counting device 2 is convenient to connect with; the fluid can act on the fish skeleton 14 to realize the integral pushing of the plunger, so that the plunger body 1 ascends.
It should be noted that the embodiment of the present invention only illustrates one possible structure of the plunger body 1, and other plunger structures also belong to the protection scope of the present invention, and are not described herein.
For the counting device 2, it is possible to achieve a mechanical counting after striking the downhole latch.
In terms of structural arrangement, the connection piece 24, the elastic buffer 22 and the guide pin 25 are protected by the outer cylinder 21, so that the movement of the guide pin 25 takes place in the outer cylinder 21.
An inner thread section is arranged on the inner wall of the upper end of the outer barrel 21, and an outer thread section is arranged on the outer wall of the connector 12, so that the connector 12 can extend into a barrel cavity of the upper end of the outer barrel 21, the threaded connection of the outer barrel 21 and the connector 12 is realized, and then the connection of the plunger body 1 and the counting device 2 is realized.
The lower end of the outer tube 21 extends toward the tube cavity, and a click can be achieved on one end of the connecting member 24 so that one end of the connecting member 24 is disposed in the outer tube 21, as shown in fig. 1.
Since the cooperation between the connector 24 and the guide pin 25 is a key to realize the counting function, the connector 24 and the guide pin 25 are key components of the plunger having the fine reach determination function of the embodiment of the present invention.
Alternatively, as shown in FIG. 1, the connector 24 includes a first portion 243 and a second portion 244 that are connected;
the first portion 243 is a cylinder structure with a cylinder inside, the outer wall of the first portion 243 is provided with a slide way 241, and the elastic buffer device 22 is sleeved on the cylinder;
the second part 244 is in a cylinder structure, and the second part 244 is connected with the impact head 23;
the first portion 243 is movably disposed in the cylinder cavity of the outer cylinder 21, the second portion 244 is located outside the outer cylinder 21, and the cylinder diameter of the second portion 244 is smaller than that of the first portion 243.
By such arrangement, one end of the connecting member 24 is movably disposed in the cavity of the outer cylinder 21, and the guide pin 25 can be always limited in the slide 241, and at the same time, the connection of the impact head 23 and the connecting member 24 is facilitated.
Fig. 2 is a schematic structural diagram of a slide way of a plunger with a downhole reaching determination function according to an embodiment of the present invention. As shown in fig. 2, the outer wall of the first portion 243 has a plurality of first unidirectional teeth 2432 and a plurality of second unidirectional teeth 2433, and a slideway 241 is formed between the plurality of first unidirectional teeth 2432 and the plurality of second unidirectional teeth 2433;
each first one-way tooth 2432 faces opposite to the tooth blocks of each second one-way tooth 2433, and the tooth blocks of each first one-way tooth 2432 are correspondingly arranged between the tooth blocks of two adjacent second one-way teeth 2433.
The tooth block structure of each first unidirectional tooth 2432 is a right triangle structure with a vertical left side and a diagonal right side, the tooth block structure of each second unidirectional tooth 2433 is a right triangle structure with a vertical left side and a diagonal right side, and under the limiting action of the plurality of first unidirectional teeth 2432 and the plurality of second unidirectional teeth 2433, as shown in fig. 3, in the process of impact counting, the guide pin 25 can only move along the rightward direction in the slideway 241 formed between the first unidirectional teeth 2432 and the second unidirectional teeth 2433.
It should be noted that the tooth tip of the tooth block of the first unidirectional tooth 2432 may be located on the same plane as the tooth tip of the tooth block of the second unidirectional tooth 2433, and the tooth block length of the first unidirectional tooth 2432 may be the same as the tooth block length of the second unidirectional tooth 2433.
Further, the first unidirectional tooth 2432 and the second unidirectional tooth 2433 are annularly arranged on the outer wall of the first portion 243, that is, the first unidirectional tooth 2432 and the second unidirectional tooth 2433 are both toothed rings, and the slideway 241 is an annular slideway, so that the guide pin 25 can move along the annular slideway to realize cycle counting for multiple times, and further, the plunger with the underground arrival judgment function in the embodiment of the invention can realize cycle use.
For ease of counting, the number of identification symbols 242 provided on the connector 24 is at least two, as shown in fig. 2;
each identification symbol 242 is disposed on the tooth block of the first one-way tooth 2432 or the tooth block of the second one-way tooth 2433 in a one-to-one correspondence.
Determining that the plunger reaches the position of the fastener by observing that the identification symbol 242 displayed in the through hole 211 formed on the outer barrel 21 changes before and after one impact is realized; by observing that the identification symbol 242 displayed in the through hole 211 formed in the outer tube 21 does not change before and after the impact is effected, it is determined that the plunger does not reach the stopper position.
For the convenience of observation, it can be understood that the number of the through holes 211 is at least one, and may be a plurality of, for example, the through holes 211 may be formed at the position of the outer cylinder 21 corresponding to the tooth block of each first unidirectional tooth 2432 or the tooth block of each second unidirectional tooth 2433.
Meanwhile, the identification symbol 242 may be a number, a letter, or other symbol that is convenient for identification, which is not particularly limited in the embodiment of the present invention.
Alternatively, the guide pin 25 may have a cylindrical structure or an ellipsoidal structure, and the structure of the guide pin 25 is not particularly limited in the embodiment of the present invention, so long as the guide pin 25 is ensured to be stably fixed on the inner wall of the outer cylinder 21.
For the striking head 23, the striking head 23 is directly contacted with the latch and can drive the connecting piece 24 to move.
In one possible embodiment, the impact head 23 includes a connecting portion 231 and an impact portion 232 that are connected, as shown in fig. 1;
the connecting part 231 is in a cylindrical structure, and the connecting part 231 is inserted into the barrel cavity of the barrel body where the second part 244 is positioned and is connected with the second part 244;
the striking portion 232 has a truncated cone structure.
The second part 244 is connected with the connecting part 231, so that the impact head 23 and the connecting piece 24 are stably fixed; the impact part 232 is in a truncated cone structure, so that the contact area of the impact head 23 when contacting the clamp is larger, and the stress is more easily balanced.
In order to realize firm connection between the connecting portion 231 and the second portion 244, an inner threaded section is disposed on the inner wall of the second portion 244, an outer threaded section is disposed on the outer wall of the connecting portion 231, and the outer threaded section is adapted to cooperate with the inner threaded section, so that threaded connection between the connecting portion 231 and the second portion 244 can be realized, and further firm connection between the impact head 23 and the connecting member 24 is ensured.
Further, in order to lock the connection portion 231 and the second portion 244, the second portion 244 is provided with a threaded hole 2441, and the set screw passes through the threaded hole 2441 and abuts against the connection portion 231, so that back-off between the connection portion 231 and the second portion 244 is avoided.
For the elastic buffer device 22, the elastic buffer device 22 mainly plays an elastic buffer role on the connecting piece 24, and the connecting piece 24 is assisted to reset.
The elastic buffer means 22 may be, for example, a spring or an elastic plastic pad.
In one possible example, the use of a plunger with downhole arrival determination according to an embodiment of the present invention may be illustrated with reference to fig. 1:
the plunger is lowered into an oil pipe of an actual well to be judged at a wellhead;
when the impact head 23 impacts the fastener in the well, the impact head 23 can drive the connecting piece 24 to move upwards, the elastic buffer device 22 is continuously compressed, and at the moment, the guide pin 25 can move obliquely to the right and downwards along the slideway 241 due to the mutual movement between the connecting piece 24 and the outer barrel 21, so that the outer barrel 21 and the connecting piece 24 rotate;
after the impact head 23 impacts the fastener, the plunger body 1 moves upwards due to the upward pushing action of underground fluid, the elastic buffer device 22 is continuously reset, the guide pin 25 moves upwards to the right along the slideway 241, so that the outer cylinder 21 and the connecting piece 24 continue to rotate in the same direction until the elastic buffer device 22 is reset, and one impact counting is realized;
the plunger is lifted up to the wellhead by the lifting action of the fluid in the well, the surface is taken out after the plunger is caught by the catcher of the wellhead, and whether the plunger reaches the catcher position is determined by observing the change of the identification symbol 242 on the connecting piece 24 displayed in the through hole 211 on the outer cylinder 21.
In the present invention, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.
The foregoing description is only for the convenience of those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. 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 (9)

1. A plunger having a downhole arrival determination function, the plunger comprising: a plunger body (1) and a counting device (2), wherein,
the counting device (2) comprises an outer cylinder (21), an elastic buffer device (22), an impact head (23), a connecting piece (24) and a guide pin (25), wherein the guide pin (25) is fixed on the inner wall of the outer cylinder (21), one end of the connecting piece (24) is movably arranged in a cylinder cavity of the outer cylinder (21), a slideway (241) for supplying and limiting the movement of the guide pin (25) is arranged on the outer wall of the connecting piece (24), and the slideway (241) is used for converting the movement of the guide pin (25) from vertical up-down movement to upward-downward movement on the right side in an inclined manner; the elastic buffer device (22) is positioned in the cylinder cavity of the outer cylinder (21), and one end of the elastic buffer device is sleeved on the connecting piece (24); the impact head (23) is connected with the other end of the connecting piece (24) and is positioned outside the outer cylinder (21); an identification symbol (242) is arranged on the connecting piece (24) positioned at one side of the slideway (241), and a through hole (211) for displaying the identification symbol (242) is arranged on the outer cylinder (21);
the plunger body (1) is connected with the upper end of the outer cylinder (21), and the other end of the elastic buffer device (22) is abutted against the plunger body (1);
the connector (24) includes a first portion (243) and a second portion (244) connected; the first part (243) is of a cylinder structure with a cylinder arranged inside, the slide way (241) is arranged on the outer wall of the first part (243), and the elastic buffer device (22) is sleeved on the cylinder; the second part (244) is of a cylindrical structure, and the second part (244) is connected with the impact head (23); the first part (243) is movably arranged in a cylinder cavity of the outer cylinder (21), the second part (244) is positioned outside the outer cylinder (21), and the cylinder diameter of the second part (244) is smaller than that of the first part (243).
2. The plunger with the downhole reaching determination function according to claim 1, wherein the outer wall of the first portion (243) has a plurality of first unidirectional teeth (2432) and a plurality of second unidirectional teeth (2433), the slideway (241) being formed between the plurality of first unidirectional teeth (2432) and the plurality of second unidirectional teeth (2433);
each first unidirectional tooth (2432) and each second unidirectional tooth (2433) face opposite tooth blocks, and each first unidirectional tooth (2432) tooth block is correspondingly arranged between two adjacent second unidirectional tooth (2433) tooth blocks.
3. The plunger with downhole reaching determination function of claim 2, wherein the plurality of first unidirectional teeth (2432) and the plurality of second unidirectional teeth (2433) are looped on an outer wall of the first portion (243).
4. The plunger with the downhole reaching determination function according to claim 2, wherein the number of the identification symbols (242) is at least two;
each identification symbol (242) is arranged on the tooth block of the first unidirectional tooth (2432) or the tooth block of the second unidirectional tooth (2433) in a one-to-one correspondence.
5. The plunger with the downhole reaching determination function according to claim 1, wherein the striking head (23) comprises a connecting portion (231) and a striking portion (232) connected;
the connecting part (231) is of a cylindrical structure, and the connecting part (231) is inserted into a cylinder cavity of the cylinder body where the second part (244) is arranged and is connected with the second part (244);
the impact part (232) is of a truncated cone type structure.
6. The plunger with downhole reaching determination function as recited in claim 5, wherein an inner wall of the second portion (244) is provided with an internally threaded section, and an outer wall of the connecting portion (231) is provided with an externally threaded section, the externally threaded section being adapted to mate with the internally threaded section.
7. The plunger with the downhole reaching determination function as recited in claim 5, wherein the second portion (244) is provided with a threaded hole (2441), and a set screw passes through the threaded hole (2441) and abuts against the connecting portion (231).
8. The plunger with the downhole reaching determination function according to claim 1, wherein the number of the through holes (211) is at least one.
9. The plunger with downhole reaching determination function as recited in claim 1, wherein the identification symbol (242) is a number.
CN201811460113.4A 2018-11-30 2018-11-30 Plunger with downhole arrival determination function Active CN111335881B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201811460113.4A CN111335881B (en) 2018-11-30 2018-11-30 Plunger with downhole arrival determination function

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US6634426B2 (en) * 2000-10-31 2003-10-21 James N. McCoy Determination of plunger location and well performance parameters in a borehole plunger lift system
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CN204703813U (en) * 2015-04-15 2015-10-14 中国石油天然气股份有限公司 Underground clamping and buffering integrated device for plunger gas lift
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