CN108150153B - Instrument device that drops is prevented in cable test in oil gas well - Google Patents
Instrument device that drops is prevented in cable test in oil gas well Download PDFInfo
- Publication number
- CN108150153B CN108150153B CN201611096409.3A CN201611096409A CN108150153B CN 108150153 B CN108150153 B CN 108150153B CN 201611096409 A CN201611096409 A CN 201611096409A CN 108150153 B CN108150153 B CN 108150153B
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- China
- Prior art keywords
- jaw
- center frame
- steady rest
- support sleeve
- tension adjusting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0021—Safety devices, e.g. for preventing small objects from falling into the borehole
Abstract
The invention discloses an instrument falling prevention device for cable testing in an oil-gas well. The device includes: the upper connector is used for being connected with the cable connector; the claw support sleeve is positioned below the upper joint; a spring abutting against the inner upper surface of the jaw support sleeve; a tension adjusting head which is abutted against the lower end of the spring and is connected with the upper joint; the center frame is connected with the lower end of the jaw supporting sleeve and is connected with an underground testing instrument; the center frame comprises a first center frame part positioned inside the jaw support sleeve and a second center frame part positioned outside the jaw support sleeve; the jaw supporting sleeve is provided with an axial open slot, and at least one jaw which can rotate relative to the jaw supporting sleeve is arranged in the open slot; an elastic part for expanding the lower end of the claw is arranged between the first part of the center frame and the claw; and the upper end of the jaw is clamped between the tension adjusting head and the jaw support sleeve. The device can be clamped on an oil pipe coupling, and an instrument connected with the device is effectively prevented from falling off the well bottom and being broken and scrapped.
Description
Technical Field
The invention relates to the technical field of instrument testing in an oil gas well, in particular to an instrument falling prevention device for cable testing in the oil gas well.
Background
In the process of oil and gas production, various testing instruments are often required to be lowered into an oil and gas well for testing. Occasionally during testing, it may happen that the downhole tool gets stuck inside the wellbore casing. Pulling the cable hard can cause the cable stress to increase sharply so that the cable is broken, thus causing the instrument to fall into the well bottom, not only the detected data can not be recorded, but also the normal oil and gas production is influenced, the instrument falls into the well bottom, is broken and scrapped, and causing serious economic loss.
Disclosure of Invention
The invention provides an instrument falling prevention device for cable testing in an oil-gas well, which is used for preventing the technical problem that an instrument falls into the bottom of the oil-gas well after a cable is broken.
The invention provides an instrument falling prevention device for cable testing in an oil-gas well, which comprises:
the upper connector is used for being connected with the cable connector;
the jaw supporting sleeve is positioned below the upper joint;
a spring disposed within the jaw bushing and abutting an interior upper surface of the jaw bushing;
the tension adjusting head is abutted against the lower end of the spring and is connected with the upper joint; and
the center frame is connected with the lower end of the jaw supporting sleeve and is used for being connected with a downhole testing instrument;
wherein the steady rest comprises a first portion of the steady rest located inside the jaw brace and a second portion of the steady rest located outside the jaw brace; the second portion of the steady rest is connected to the downhole testing tool;
the jaw support sleeve is provided with an axial open slot, and at least one jaw which can rotate relative to the jaw support sleeve is arranged in the open slot;
an elastic part for expanding the lower ends of the clamping jaws is arranged between the first part of the center frame and the clamping jaws;
and the upper end of the jaw is clamped between the tension adjusting head and the jaw support sleeve.
Preferably, the jaw is elongated and has a lower end with a downward slant branch.
Specifically, the jaw is fixed in an opening groove of the jaw supporting sleeve through a pin.
More preferably, the number of the claws is two, and the claws are symmetrical along the axis of the claw support sleeve.
Specifically, the center frame is arranged below the tension adjusting head; the elastic component is fixed on the upper end face of the center frame.
Preferably, the center frame is a revolving body; the diameter of the first portion of the steady rest is less than the diameter of the second portion of the steady rest; the lower end of the elastic component is positioned on the outer side surface of the first part of the center frame; the lower end of the claw support sleeve is connected with the second part of the center frame.
Preferably, the apparatus further comprises: and the tension adjusting spare cap is arranged at the upper end of the upper joint and can be propped against the tension adjusting head.
More preferably, the apparatus further comprises: a first pressing cap provided between the tension adjusting spare cap and the upper joint; and the first sealing ring is arranged on the lower end surface of the first pressing cap.
More preferably, the apparatus further comprises: the second pressing cap is arranged at the lower end of the center frame; and the second sealing ring is arranged on the upper end surface of the second pressing cap.
Specifically, the elastic member is a reed.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: at the moment that the cable is broken by pulling, the anti-instrument falling device for testing the cable in the oil-gas well provided by the invention bears a large upward pulling force to enable the pulling force adjusting head to move upwards, the spring is compressed, the clamping jaw is opened, and the clamping jaw is clamped on the oil pipe coupling in the falling process, so that the instrument connected with the anti-instrument falling device is effectively prevented from falling to the well bottom and being broken and scrapped.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an instrument drop prevention device for cable testing in an oil and gas well according to an exemplary embodiment of the present invention;
FIG. 2 is a diagram illustrating an example embodiment of the present invention showing the use of an instrument drop prevention device for cable testing in an oil and gas well;
the reference numerals in the drawings denote:
1. a cable; 2. a tension adjusting spare cap; 3. an upper joint; 4. a claw support sleeve; 401. an open slot; 5. a spring; 6. a tension adjusting head; 7. a pin; 8. a claw; 801. branching; 9. an elastic member; 10. a center frame; 1001. a steady rest first portion; 1002. a steady rest second portion; 11. a second seal ring; 12. a second press cap; 13. a tubing coupling; 14. and (4) an oil pipe.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an instrument drop prevention device for cable testing in an oil and gas well according to an exemplary embodiment of the invention. Referring to fig. 1, the invention provides an instrument drop prevention device for cable testing in an oil and gas well, which at least comprises:
an upper connector 3 for connecting with a cable connector;
a jaw supporting sleeve 4 positioned below the upper joint 3;
a spring 5 disposed within the jaw bushing 4 and abutting against an inner upper surface 401 of the jaw bushing 4;
a tension adjusting head 6 abutting against the lower end of the spring 5 and connected with the upper joint 3; and
the center frame 10 is connected with the lower end of the jaw support sleeve 4 and is used for being connected with a downhole testing instrument;
wherein the steady rest 10 comprises a steady rest first portion 1001 located inside the jaw brace 4 and a steady rest second portion 1002 located outside the jaw brace 4; the second portion 1002 of the steady rest is connected to downhole testing instrumentation;
the jaw support 4 has an axial open slot 401 (shown in fig. 2), and at least one jaw 8 rotatable relative to the jaw support 4 is disposed in the open slot 401;
between the first part 1001 of the steady rest and the jaws 8, there are elastic members 9 for spreading the lower ends of the jaws 8;
and the upper end of the jaw 8 is clamped between the tension adjusting head 6 and the jaw support sleeve 4.
In use, as shown in fig. 2, the cable 1 is passed through the cable test anti-instrument-falling device in the oil and gas well, the upper connector 3 is connected with the cable connector, and the center frame 10 is connected with the downhole test instrument. At the moment that the cable 1 is broken by pulling, the device bears a large upward pulling force which exceeds a pressing force required by the deformation of the spring 5, so that the pulling force adjusting head 6 moves upwards, the spring 5 is compressed, the elastic component 9 props the clamping jaws 8 apart, the clamping jaws 8 are in an open state, and the clamping jaws 8 are clamped on a tubing coupling 13 between tubing 14 in the dropping process, so that an instrument connected with the clamping jaws is effectively prevented from falling to the bottom of a well and being broken and scrapped.
The weight to compressively deform the spring 5 may be set by those skilled in the art according to the weight of the instrument to be tested downhole, typically 2 to 3 times the weight of the instrument to be tested downhole. The person skilled in the art can adjust the weight of the spring 5 which is compressed and deformed by the upward tension by adjusting the position relationship between the upper joint 3 and the tension adjusting head 6.
In practical application, the instrument usually has a weight of 200 kg, and the tension adjusting head 6 is adjusted to make the spring 5 generate compression deformation and have a weight of 400 kg to 600 kg, and make the cable breaking weight usually 1.5 tons, that is, after the cable is broken, the jaw 8 of the cable testing anti-drop device in the oil and gas well can be opened and clamped at the tubing coupling (as shown in fig. 2), so as to ensure that the instrument does not drop to the well bottom.
The axial opening groove 401 means that the length direction of the opening groove 401 is the same as the axial direction of the pawl holder 4.
In order to prevent the position of the tensioning head 6 relative to the upper joint 3 from changing, the device further comprises: a tension adjusting spare cap 2 which is arranged at the upper end of the upper joint 3 and can be propped against the tension adjusting head 6.
In practice, the jaws 8 are elongated and have a downward angled branch 801 at their lower end, as shown in fig. 1. The downward inclined branch structure is not only beneficial to the clamping of the clamping jaw 8 at the tubing coupling, but also easy to take out from the well when fishing.
Also, in practice, the pawl 8 may be secured within the open slot 401 of the pawl collar 4 by a pin 7 so that the pawl 8 may rotate relative to the pawl collar 4.
Furthermore, in practical application, the number of the open grooves 401 can be two, and the two open grooves are symmetrical along the axis of the jaw supporting sleeve 4; the number of the jaws 8 can be two and is symmetrical along the axis of the jaw support 4 to ensure that the jaws 8 can be accurately clamped at the tubing coupling and the centerline of the device is parallel to the axis of the wellbore.
In addition, in practical application, the device can be a rotating body.
In one embodiment of the invention, the center frame 10 is disposed below the tension adjusting head 6; the elastic member 9 is fixed to an upper end surface of the center frame 10. The resilient member 9 may be a spring, which is generally elongate and which is urged open with its end against the jaw 8.
In a modified embodiment of the present invention, as shown in fig. 1, the center frame 10 is a solid of revolution; the diameter of the first portion 1001 of the steady rest is smaller than the diameter of the second portion 1002 of the steady rest; the lower end of the elastic member 9 is located on the outer side surface of the first portion 1001 of the center frame; the lower end of the jaw brace 4 is connected to the steady rest second portion 1002. Therefore, when the jaw 8 is in a closed state (as shown in fig. 1), the jaw 8 is positioned in the open slot 401 of the jaw support sleeve 4 and does not protrude out of the device, so that the jaw 8 is prevented from colliding and damaging with an oil pipe.
In practical applications, the lower end of the jaw support 4 may be connected to the upper end of the second portion 1002 of the center frame, and furthermore, an external thread is provided on the outer side surface of the lower end of the second portion 1002 of the center frame. The steady rest 10 is screwed to the downhole testing tool.
As will be appreciated by those skilled in the art, the upper connector 3 and the tension adjusting head 6 may be connected by threads; the upper joint 3 and the tension adjusting spare cap 2 can be connected through threads; the jaw support 4 and the centre frame 10 can be connected by screw thread.
In practical application, in order to prevent liquid in the well from entering the inside of the instrument, the device further comprises: a second press cap 12 provided at the lower end of the center frame 10; and a second seal ring 11 provided on an upper end surface of the second gland 12.
Also, in practical use, in order to prevent fluid in the well from entering the cable joint, the apparatus further comprises: a first press cap provided between the tension adjusting spare cap 2 and the upper joint 3; and the first sealing ring is arranged on the lower end surface of the first pressing cap. The structure of the first press cap and the first seal ring can be seen in the structure of the second press cap and the second seal ring in fig. 2.
It should be noted that the terms "upper side", "upper end", "lower end", and the like as used herein refer to the position of the device under normal operation. As shown in fig. 2, the upper end face of the second gland 12 refers to the upper end face of the second gland 12 shown in fig. 2.
According to the embodiment, the anti-instrument falling device for testing the cable in the oil-gas well bears a large upward pulling force, so that the pulling force adjusting head moves upwards, the spring is compressed, the clamping jaws are opened, and the clamping jaws are clamped on the oil pipe coupling in the falling process, so that the instrument connected with the anti-instrument falling device is effectively prevented from falling to the well bottom and being broken and scrapped.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a cable test prevents instrument device that drops in oil gas well which characterized in that includes:
an upper connector (3) for connecting with a cable connector;
a jaw supporting sleeve (4) positioned below the upper joint (3);
a spring (5) disposed within the jaw collar (4) and abutting against an inner upper surface (401) of the jaw collar (4); wherein the weight of the spring (5) to be compressively deformed is 2 to 3 times the weight of the downhole testing instrument;
a tension adjusting head (6) which abuts against the lower end of the spring (5) and is connected with the upper joint (3); and
the center frame (10) is connected with the lower end of the jaw support sleeve (4) and is used for being connected with the downhole testing instrument;
wherein the steady rest (10) comprises a steady rest first portion (1001) located inside the jaw brace (4) and a steady rest second portion (1002) located outside the jaw brace (4); the second portion (1002) of the steady rest is connected to the downhole testing tool;
the jaw support sleeve (4) is provided with an axial open slot (401), and at least one jaw (8) which can rotate relative to the jaw support sleeve (4) is arranged in the open slot (401);
an elastic component (9) for expanding the lower end of the claw (8) is arranged between the first part (1001) of the center frame and the claw (8);
and the upper end of the jaw (8) is clamped between the tension adjusting head (6) and the jaw support sleeve (4).
2. Device according to claim 1, characterized in that the jaws (8) are elongated and have a lower end with a downward-sloping branch (801).
3. Device according to claim 1, characterized in that the jaw (8) is fixed in the opening slot (401) of the jaw bushing (4) by means of a pin (7).
4. A device according to any one of claims 1 to 3, characterized in that the number of jaws (8) is two and is symmetrical along the axis of the jaw support (4).
5. The device according to claim 1, characterized in that the steady rest (10) is arranged below the tensioning head (6); the elastic component (9) is fixed on the upper end face of the center frame (10).
6. The device according to claim 1, characterized in that said steady rest (10) is a body of revolution; the first steady rest portion (1001) has a diameter smaller than the second steady rest portion (1002); the lower end of the elastic component (9) is positioned on the outer side surface of the first part (1001) of the center frame; the lower end of the jaw support sleeve (4) is connected with the second part (1002) of the center frame.
7. The apparatus of claim 1, further comprising: and the tension adjusting spare cap (2) is arranged at the upper end of the upper joint (3) and can be propped against the tension adjusting head (6).
8. The apparatus of claim 7, further comprising: a first press cap provided between the tension adjusting spare cap (2) and the upper joint (3); and the first sealing ring is arranged on the lower end surface of the first pressing cap.
9. The apparatus of claim 1, further comprising: a second press cap (12) arranged at the lower end of the center frame (10); and a second sealing ring (11) arranged on the upper end surface of the second pressing cap (12).
10. Device according to claim 1, characterized in that the elastic member (9) is a reed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096409.3A CN108150153B (en) | 2016-12-02 | 2016-12-02 | Instrument device that drops is prevented in cable test in oil gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096409.3A CN108150153B (en) | 2016-12-02 | 2016-12-02 | Instrument device that drops is prevented in cable test in oil gas well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108150153A CN108150153A (en) | 2018-06-12 |
| CN108150153B true CN108150153B (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611096409.3A Active CN108150153B (en) | 2016-12-02 | 2016-12-02 | Instrument device that drops is prevented in cable test in oil gas well |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110857624A (en) * | 2018-08-15 | 2020-03-03 | 中国石油天然气股份有限公司 | Underground positioning device |
| CN109386278B (en) * | 2018-10-29 | 2024-01-12 | 长江地球物理探测（武汉）有限公司 | Expansion and contraction device and drilling probe |
| CN109973078B (en) * | 2019-03-26 | 2022-11-01 | 香港中文大学(深圳)城市地下空间及能源研究院 | Auxiliary MWD high-efficiency well entering tool |
| CN109882106B (en) * | 2019-03-26 | 2021-04-30 | 西华大学 | Efficient well entry-fishing tool for measurement while drilling |
| CN111502643B (en) * | 2020-05-13 | 2023-09-12 | 磐索地勘科技(广州)有限公司 | Downhole positioning tool and method |
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