CN211144417U - Closed coring tool and upper piston sealing device thereof - Google Patents
Closed coring tool and upper piston sealing device thereof Download PDFInfo
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- CN211144417U CN211144417U CN201921158890.3U CN201921158890U CN211144417U CN 211144417 U CN211144417 U CN 211144417U CN 201921158890 U CN201921158890 U CN 201921158890U CN 211144417 U CN211144417 U CN 211144417U
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- valve
- upper piston
- flow passage
- valve core
- passage hole
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 238000003306 harvesting Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 14
- 238000005553 drilling Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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Abstract
The utility model provides a closed coring tool and an upper piston sealing device thereof, wherein the upper piston sealing device comprises a valve cap (1), an elastic part (2), a valve core (3) and a valve body (4), the middle part of the valve body (4) is a flow passage hole which is communicated with the upper end and the lower end, and the position of the flow passage hole close to the lower end is a closing structure; the valve core (3) is in a stepped shaft shape with a large upper part and a small lower part and is positioned in the flow passage hole, the upper end surface of the valve core (3) is provided with a first liquid passing hole, and the outer peripheral surface of the lower part of the valve core (3) is provided with a radial hole communicated with the first liquid passing hole; the valve cap (1) is positioned at the position, close to the upper end, of the flow passage hole and is detachably connected with the valve body (4), and the valve cap (1) is provided with a second liquid passing hole communicated with the flow passage hole; one end of the elastic piece (2) is abutted against the valve cap (1), and the other end is abutted against the valve core (3). The utility model provides an upper piston sealing device simple structure possesses in the pit and the automatic pressure release ability in ground, helps improving coring harvest rate and security.
Description
Technical Field
The utility model relates to a drilling equipment technical field especially relates to an airtight coring tool and go up piston sealing device thereof.
Background
In recent years, in the process of oil field development, in order to really know information such as formation lithology, physical properties, mineral components and the like, a closed coring tool and a closed fluid are generally adopted to take out a core which is hardly polluted by a drilling fluid. When the closed coring tool is used, the coring inner cylinder is filled with the closed liquid, then the upper piston sealing device is screwed on the thread at the shunt joint, and the upper piston sealing device has the functions of sealing the coring inner cylinder and preventing drilling fluid from eroding the rock core.
The existing upper piston sealing device generally has no automatic pressure relief function, so that in the process of underground coring, if the coring inner cylinder is not filled with sealing liquid or has air, the inner cylinder is easy to suppress pressure along with the entry of a rock core into the coring inner cylinder, so that the rock core is difficult to enter the inner cylinder, and the coring yield is finally influenced. Meanwhile, the existing upper piston sealing device is easy to cause the problem of safety valve failure, so that residual pressure cannot be timely relieved during coring, and the blasting phenomenon is easy to occur, and potential safety hazards exist.
In summary, how to improve the upper piston sealing device to improve the coring yield and safety has become a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an airtight coring tool and go up piston sealing device thereof should go up piston sealing device simple structure, possesses in the pit and the automatic pressure release ability in ground, helps improving coring yield and security.
In order to achieve the above object, the utility model provides a following technical scheme:
an upper piston seal for a closed coring tool, comprising:
the middle part of the valve body is provided with a flow passage hole which penetrates through the upper end and the lower end, and the position of the flow passage hole close to the lower end is of a closing structure;
the valve core is positioned in the flow passage hole, the valve core is in a stepped shaft shape with a large upper part and a small lower part, a first liquid passing hole is formed in the upper end surface of the valve core, and a radial hole communicated with the first liquid passing hole is formed in the outer peripheral surface of the lower part of the valve core;
the valve cap is positioned close to the upper end of the flow passage hole and is detachably connected with the valve body, and the valve cap is provided with a second liquid passing hole communicated with the flow passage hole;
the elastic piece is located in the flow passage hole, one end of the elastic piece is abutted to the valve cap, and the other end of the elastic piece is abutted to the valve core.
Optionally, in the above upper piston sealing device, the elastic member is a compression spring.
Optionally, in the above upper piston sealing device, one end of the elastic member close to the valve element is installed in the first liquid passing hole.
Optionally, in the above upper piston sealing device, a pull rod fixedly connected to the valve core is further included, and the valve cap has a through hole through which the pull rod passes.
Optionally, in the above upper piston sealing device, the pull rod and the valve core are of an integral structure.
Optionally, in the above upper piston sealing device, one end of the pull rod away from the valve core is provided with a pull ring.
Optionally, in the above upper piston sealing device, an internal thread is formed in a position of the flow passage hole near the upper end, and the valve cap has an external thread that engages with the internal thread.
Optionally, in the above upper piston sealing device, a closing opening of the flow passage hole is provided with a conical surface that is in sealing fit with the valve core, and a conical surface transition is formed between the lower end surface and the outer peripheral surface of the valve core.
Optionally, in the above upper piston sealing device, an outer circumferential surface of the valve body is provided with an external thread.
A closed coring tool comprising an upper piston seal, the upper piston seal being as claimed in any one of the preceding claims.
According to the above technical scheme, the utility model provides an in last piston sealing device for airtight coring tool, the position that the runner hole of valve body is close to the lower extreme is binding off structure, valve cap detachably connects the position that is close to the upper end in the runner hole, the case is located the runner hole, and be provided with the elastic component between case and the valve cap, the both ends of elastic component respectively with case and valve cap looks butt, the case is big-end-up's step shaft shape, because first liquid hole of crossing has been seted up to the up end of case, the radial hole with first liquid hole intercommunication of crossing is seted up to the outer peripheral face of the lower part of case, and the valve cap has the second that communicates with the runner hole and crosses the liquid hole, so under the two effects of the impact force of drilling fluid and the restoring force of elastic component, the lower extreme of case closely laminates with the binding off in runner hole.
When the coring tool normally works, the inside of the coring tool is divided into two areas of drilling fluid and sealing fluid from top to bottom by the sealing surface between the valve core and the valve body, and if the coring inner cylinder is not filled with the sealing fluid or has air, the air buoyancy can overcome the impact force of the drilling fluid and the restoring force of the elastic piece along with the increase of the setting depth of the coring tool, so that the sealing surface between the valve core and the valve body is slightly opened, the air pressure is automatically removed, and the sealing surface can be restored to a sealing state. And as the coring tool gradually rises to the ground from the bottom of the well, the pressure of the core in the coring inner cylinder can be automatically reduced to atmospheric pressure, and the whole pressure relief process does not need manual operation. Therefore, the utility model provides an upper piston sealing device simple structure possesses in the pit and the automatic pressure release ability in ground, helps improving coring harvest rate and security.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of an upper piston seal for a closed coring tool according to an embodiment of the present invention;
fig. 2 is a schematic view of the spool 3 of fig. 1.
Labeled as:
1. a bonnet; 2. an elastic member; 3. a valve core; 31. a pull rod; 4. a valve body.
Detailed Description
For the sake of understanding, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an upper piston sealing device for a closed coring tool provided in an embodiment of the present invention includes a valve cap 1, an elastic member 2, a valve core 3, and a valve body 4, wherein a flow passage hole penetrating an upper end and a lower end is formed in a middle portion of the valve body 4, and a position of the flow passage hole near the lower end is a closing structure; the valve core 3 is positioned in the flow passage hole, the valve core 3 is in a stepped shaft shape with a large upper part and a small lower part, the upper end surface of the valve core 3 is provided with a first liquid passing hole, and the outer peripheral surface of the lower part of the valve core 3 is provided with a radial hole communicated with the first liquid passing hole; the valve cap 1 is positioned at the position close to the upper end of the flow passage hole and is detachably connected with the valve body 4, and the valve cap 1 is provided with a second liquid passing hole communicated with the flow passage hole; the elastic member 2 is located in the flow passage hole, and one end of the elastic member abuts against the bonnet 1 and the other end abuts against the valve core 3.
During operation, the upper piston sealing device is connected with the coring tool, drilling fluid enters a flow passage hole of the valve body 4 from a second liquid passing hole of the valve cap 1 from the inside of the petroleum drill rod and then flows into a first liquid passing hole of the valve core 3, the drilling fluid is double-acted by the impact force of the drilling fluid and the restoring force of the elastic part 2, the lower end of the valve core 3 is tightly attached and sealed with the closing of the flow passage hole, the drilling fluid reaches an annular cavity between the peripheral surface of the valve core 3 and the wall of the flow passage hole from a radial hole of the valve core 3 and stops, and therefore the inside of the coring tool is isolated into two areas of the drilling fluid and the sealing fluid from.
If the inner core barrel is not filled with sealing liquid or air exists, the air buoyancy force overcomes the impact force of drilling liquid and the restoring force of the elastic piece 2 along with the increase of the setting depth of the core tool, so that the sealing surface between the valve core 3 and the valve body 4 is slightly opened, the air pressure is automatically removed, and the sealing surface is restored to the sealing state. And as the coring tool gradually rises to the ground from the bottom of the well, the pressure of the core in the coring inner cylinder can be automatically reduced to atmospheric pressure, and the whole pressure relief process does not need manual operation. Therefore, the utility model provides an upper piston sealing device simple structure possesses in the pit and the automatic pressure release ability in ground, helps improving coring harvest rate and security.
In a specific practical application, the elastic member 2 may be a compression spring. In order to reliably mount the elastic member 2, one end of the elastic member 2 near the valve element 3 may be mounted in the first liquid passing hole, as shown in fig. 1.
Referring to fig. 2, in order to enable manual pressure relief, the upper piston sealing device may further include a pull rod 31 fixedly connected to the valve core 3, as shown in fig. 1, the bonnet 1 has a through hole for the pull rod 31 to pass through. In this embodiment, the pull rod 31 and the valve core 3 are an integrated structure.
To facilitate the operation of the pull rod 31, a pull ring may be provided at an end of the pull rod 31 remote from the spool 3, as shown in fig. 2.
The bonnet 1 and the valve body 4 can be connected in various ways as long as the bonnet and the valve body are detachable. In order to adjust the acting force of the elastic element 2 on the valve core 3, in the embodiment, the flow passage hole of the valve body 4 is provided with an internal thread at a position close to the upper end, the valve cap 1 is provided with an external thread matched with the internal thread, so that the degree of the valve cap 1 entering the valve body 4 can be adjusted by rotating the valve cap, and the elastic restoring force of the elastic element 2 is changed.
In order to improve the sealing effect between the valve core 3 and the valve body 4, in this embodiment, a tapered surface hermetically matched with the valve core 3 is provided at the closing opening of the flow passage hole, and accordingly, a tapered surface transition is formed between the lower end surface and the outer peripheral surface of the valve core 3.
In order to connect to a tap of a closed coring tool, an external thread is generally formed on the outer peripheral surface of the valve body 4.
The utility model also provides an airtight coring tool, this airtight coring tool include the last piston sealing device that above-mentioned embodiment disclosed. Since the upper piston sealing device disclosed in the above embodiment has the above technical effects, the closed coring tool having the upper piston sealing device also has the above technical effects, and details are not repeated herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An upper piston seal for a closed coring tool, comprising:
the valve body (4), the middle part of the valve body (4) is a flow passage hole which runs through the upper end and the lower end, and the position of the flow passage hole close to the lower end is a closing structure;
the valve core (3) is positioned in the flow passage hole, the valve core (3) is in a stepped shaft shape with a large upper part and a small lower part, a first liquid passing hole is formed in the upper end face of the valve core (3), and a radial hole communicated with the first liquid passing hole is formed in the outer peripheral face of the lower part of the valve core (3);
the valve cap (1) is positioned close to the upper end of the flow passage hole, the valve cap (1) is detachably connected with the valve body (4), and the valve cap (1) is provided with a second liquid passing hole communicated with the flow passage hole;
elastic component (2), elastic component (2) are located in the runner hole, and one end with valve cap (1) butt, the other end with case (3) butt.
2. An upper piston seal according to claim 1 in which the resilient member (2) is a compression spring.
3. An upper piston seal according to claim 2 characterised in that the end of the resilient member (2) adjacent the spool (3) is mounted in the first bore.
4. The upper piston sealing device according to claim 1, further comprising a pull rod (31) fixedly connected with the valve core (3), wherein the valve cap (1) is provided with a through hole for the pull rod (31) to pass through.
5. An upper piston seal according to claim 4 in which the tie rod (31) is of integral construction with the valve cartridge (3).
6. Upper piston seal according to claim 4, characterized in that the end of the pull rod (31) remote from the valve cartridge (3) is provided with a pull ring.
7. An upper piston sealing device according to any one of claims 1-6, characterized in that the flow passage hole is provided with an internal thread near the upper end, and the bonnet (1) is provided with an external thread matching with the internal thread.
8. The upper piston sealing device according to claim 7, characterized in that the closing of the flow passage hole is provided with a conical surface which is in sealing fit with the valve core (3), and the lower end surface and the outer peripheral surface of the valve core (3) are in conical surface transition.
9. An upper piston seal according to claim 7 in which the outer periphery of the valve body (4) is externally threaded.
10. A closed coring tool comprising an upper piston seal, wherein the upper piston seal is as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921158890.3U CN211144417U (en) | 2019-07-22 | 2019-07-22 | Closed coring tool and upper piston sealing device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921158890.3U CN211144417U (en) | 2019-07-22 | 2019-07-22 | Closed coring tool and upper piston sealing device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211144417U true CN211144417U (en) | 2020-07-31 |
Family
ID=71744420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921158890.3U Active CN211144417U (en) | 2019-07-22 | 2019-07-22 | Closed coring tool and upper piston sealing device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211144417U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114645682A (en) * | 2020-12-19 | 2022-06-21 | 中国石油化工集团有限公司 | Sponge coring tool and sponge coring process |
| CN114961616A (en) * | 2022-05-31 | 2022-08-30 | 重庆文理学院 | Fixed point core drill bit structure |
-
2019
- 2019-07-22 CN CN201921158890.3U patent/CN211144417U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114645682A (en) * | 2020-12-19 | 2022-06-21 | 中国石油化工集团有限公司 | Sponge coring tool and sponge coring process |
| CN114961616A (en) * | 2022-05-31 | 2022-08-30 | 重庆文理学院 | Fixed point core drill bit structure |
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