CN210622747U - Airtight coring tool of safe pressure release - Google Patents
Airtight coring tool of safe pressure release Download PDFInfo
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- CN210622747U CN210622747U CN201920946744.0U CN201920946744U CN210622747U CN 210622747 U CN210622747 U CN 210622747U CN 201920946744 U CN201920946744 U CN 201920946744U CN 210622747 U CN210622747 U CN 210622747U
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Abstract
The utility model discloses an airtight coring tool of safe pressure release, it belongs to well drilling coring technical field. The utility model comprises an outer cylinder, an inner cylinder and the like; the sealing component is arranged at the bottom of the inner cylinder and is connected with the inner wall of the inner cylinder, the inner wall of the core claw component or the inner wall of the coring bit in a sealing way; the sealing component is fixedly connected with the coring bit through at least one positioning component; and the joint component is provided with a pressure relief hole, the pressure relief hole is positioned at the lower side of the second flow through hole, and the pressure relief hole is communicated with the outer cylinder and the inner cylinder and is used for relieving the pressure intensity suddenly increased when the rock core enters the inner cylinder. The utility model has the advantages that the pressure relief holes are arranged on the joint component to communicate the space of the inner cylinder and the outer cylinder, so that the inner cylinder is prevented from being suppressed in a closed space, and people injury accidents caused by ejection when the inner cylinder and the outer cylinder are disassembled are avoided, and the safety of the closed coring tool is improved; the inner cylinder fully cores, has improved the coring rate, has promoted work efficiency.
Description
Technical Field
The utility model belongs to the technical field of well drilling coring, especially, relate to an airtight coring tool of safe pressure release.
Background
The core is a rock sample which is obtained by taking out underground rock through equipment such as a coring tool and the like for research, analysis and assay of researchers. The core is mainly used for researching a stratum, an oil-gas layer and an oil-producing layer, so that well drilling and coring are important ways for providing underground original resources, and are direct means for acquiring information of stratum lithology, oil-containing conditions and the like, the obtained core is required to be ensured not to be polluted in order to accurately acquire the information of the underground original resources, a certain amount of drilling fluid exists in a well in the well drilling and coring process, and the drilling fluid can pollute the core and influence the quality of the core.
Therefore, the prior patent document with the publication number of CN 207554001U provides a closed coring tool, which comprises an outer cylinder, an inner cylinder, a sealing device, a core gripper assembly and a coring bit, wherein the inner cylinder is sleeved in the outer cylinder, the bottom end of the inner cylinder is in threaded connection with the core gripper assembly, the bottom end of the outer cylinder is in threaded connection with the coring bit, the sealing device comprises a body and a first sealing ring, the top end of the body is positioned in the inner cylinder, the bottom end of the body is positioned outside the coring bit, the first sealing ring is arranged on the body, and the body is in sealed connection with the inner wall of the core gripper assembly through the first sealing ring.
This patent scheme passes through the airtight liquid of rock core and wraps up the rock core, plays the effect that prevents the rock core and be polluted by the drilling fluid, guarantees the quality of rock core, and specific principle is that the rock core enters into the inner tube, and the airtight liquid of rock core of inner tube is replaced by the rock core extrusion, and at extrusion replacement in-process, the airtight liquid of rock core covers the whole surface of rock core completely, reaches the effect of keeping apart drilling fluid protection rock core. However, in the process of pushing the core up into the inner cylinder, the pressure in the inner cylinder gradually increases to cause a pressure build-up phenomenon, and when the drilling tool goes out of the well and the inner cylinder and the outer cylinder are disassembled, the balance piston can be ejected under the action of large pressure, so that personal injury accidents can be caused, and the safety is low.
SUMMERY OF THE UTILITY MODEL
Technical purpose
Not enough to above-mentioned prior art, the utility model provides an airtight coring tool of safe pressure release aims at solving the problem that the inner tube suppressed the pressure, and the balance piston takes place to launch and causes the bodily injury accident when avoiding disassembling the interior urceolus, improves the security.
(II) technical scheme
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a safe pressure release's airtight coring tool, includes urceolus, inner tube, rock core claw subassembly and coring bit, and the inner tube suit leaves the clearance that is used for the drilling fluid circulation in the urceolus and between the two section of thick bamboo wall, and rock core claw subassembly is connected in the inner tube bottom, and coring bit connects in the urceolus bottom.
The safe pressure relief closed coring tool further comprises a joint component, a balance piston and a sealing component, wherein the top of the outer cylinder and the top of the inner cylinder are both connected to the joint component, and the balance piston is arranged in the joint component and used for sealing the inner cylinder; the balance piston is provided with a first flow through hole, the joint component is provided with a second flow through hole, the second flow through hole is communicated with a gap between the outer barrel and the inner barrel, and the first flow through hole and the second flow through hole are used for circulating drilling fluid. In the drilling process, the drilling fluid must flow through to cool, take away impurities at the bottom of the well, and realize the functions of consolidating the well wall, etc., and the drilling fluid enters through the gap between the inner and outer cylinders and returns to the ground through the gap between the outer cylinder and the outer sleeve. The balance piston can prevent drilling fluid from directly entering the inner barrel, and pollution to subsequently obtained rock cores is avoided. The first and second flow holes are used for flowing drilling fluid into the gap between the inner and outer cylinders.
The sealing assembly is arranged at the bottom of the inner barrel and is connected to the inner wall of the inner barrel, the inner wall of the core claw assembly or the inner wall of the coring bit in a sealing manner; the sealing assembly is fixedly connected with the core bit through at least one positioning component.
Furthermore, a second sealing ring is arranged on the sealing assembly, and the sealing assembly is connected with the inner wall of the coring bit in a sealing mode through the second sealing ring. It should be noted that, because the installation second sealing washer need set up the boss on the seal assembly outer wall, when seal assembly passes through second sealing washer and coring bit inner wall sealing connection, seal assembly is by rock core claw subassembly butt on the boss upside, can improve seal assembly's installation stability.
The balance piston is for dismantling, before the well drilling, need tear the balance piston open, pours into the airtight liquid of rock core into the inner tube, and the airtight liquid of rock core is stored in the inner tube because seal assembly realizes sealed function, when carrying out the well drilling coring, and well inner rock material or rock core promote sealing device, and the second sealing washer became invalid, then airtight liquid of rock core flow out the inner tube and cover the rock core surface, formed the protection film, kept apart rock core and drilling fluid, the realization is to the protection of rock core. The core sealing liquid has a relatively high consistency, is easy to form a protective film on the surface of the core, and cannot be washed away by the drilling fluid. The positioning component can avoid accidental failure of the sealing device in the process of lowering the drilling tool into the well, and only when drilling operation starts, the rock material or the rock core in the well pushes the sealing device, the positioning component is broken, the second sealing ring fails, and the rock core sealing liquid can flow out of the inner barrel.
And the joint component is provided with a pressure relief hole, the pressure relief hole is positioned at the lower side of the second flow through hole, and the pressure relief hole is communicated with the outer cylinder and the inner cylinder and is used for relieving the pressure intensity suddenly increased when the rock core enters the inner cylinder. In the drilling process, the drilling tool footage is continuously increased, the pressure in the inner barrel is gradually increased to generate a pressure build-up phenomenon, firstly, the insufficient amount of a core intercepted in the inner barrel is caused, and secondly, when the inner barrel and the outer barrel are disassembled, the balance piston is easy to eject, so that the accident of hurting people is caused. This scheme is equipped with the pressure release hole on the joint Assembly, and pressure increase in-process in the inner tube has been linked together inner tube space and urceolus space because of the pressure release hole, and compressed air and liquid can be extruded in the inner tube to the clearance between urceolus 5 and the inner tube 6 in, play the effect of balanced pressure to avoid appearing suppressing the pressure accident.
Further, the top of the joint component is connected with a wire protecting sleeve for protecting the joint component.
Further, the balance piston is connected to the inner wall of the connector assembly in a sliding mode, the bottom of the balance piston shields the pressure relief hole, the top of the balance piston is connected with a pressure spring, and the other end of the pressure spring abuts against the upper side drilling tool of the balance piston. When the drilling operation is started, the core does not enter the inner barrel, and drilling fluid can enter the inner barrel through the pressure relief hole and mix in the core sealing fluid, so that the effect of the core sealing fluid is influenced. In this scheme, balanced piston bottom has sheltered from the pressure release hole can avoid drilling fluid to enter into the inner tube from the pressure release hole various. When the pressure in the inner cylinder is increased, the balance piston can be pushed to slide upwards, the pressure relief hole is exposed, and the space of the inner cylinder and the space of the outer cylinder are communicated for pressure relief. When the pressure in the inner cylinder is stable, the pressure spring can rebound to enable the balance piston to move downwards to gradually shield the pressure relief hole due to the elastic characteristic of the pressure spring, so that drilling fluid can be prevented from entering the inner cylinder as much as possible.
Further, the balance piston is connected with the joint component in a sealing mode through a first sealing ring. The first sealing ring can further seal the inner barrel, and drilling fluid is prevented from entering the inner barrel.
Further, the first sealing ring is a Y-shaped sealing ring. The Y-shaped sealing ring has better durability and use effect in the reciprocating sealing device.
Furthermore, a notch is formed in the sealing assembly and used for allowing the core sealing liquid to pass through.
(III) advantageous effects
Compared with the prior art, the beneficial effects of the utility model reside in that: the pressure relief holes are formed in the joint component to communicate the spaces of the inner barrel and the outer barrel, so that the phenomenon that the pressure of the inner barrel is increased continuously in a closed space to cause pressure building, and the ejection occurs when the inner barrel and the outer barrel are disassembled to cause accidents of hurting people is avoided, and the safety of the closed coring tool is improved; because the inner barrel does not have huge pressure during drilling operation, the inner barrel can fully core, the coring rate is improved, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic front view of embodiment 1 of the present invention;
fig. 2 is a schematic view of a partial front view structure of an upper section of embodiment 1 of the present invention;
fig. 3 is a schematic view of a partial front view structure of a lower section of embodiment 1 of the present invention;
fig. 4 is a schematic view of a partial front view structure of an upper section of embodiment 2 of the present invention;
fig. 5 is a schematic view of a partial front view structure of an upper section of embodiment 2 of the present invention;
description of reference numerals: 1-protecting the silk sleeve; 2-a joint assembly; 21-a second flow through hole; 22-pressure relief holes; 3-a balance piston; 31-a pressure spring; 32-a first flow through hole; 4-a first sealing ring; 5-outer cylinder; 6-inner cylinder; 7-a core gripper assembly; 8-coring bit; 9-a sealing assembly; 91-notch; 92-a second seal ring; 93-positioning means.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-5, the present invention provides a preferred embodiment of a closed coring tool with safe pressure relief.
Example 1
Referring to fig. 1-3, a safe pressure-relief closed coring tool comprises an outer cylinder 5, an inner cylinder 6, a core claw assembly 7 and a coring bit 8, wherein the inner cylinder 6 is sleeved in the outer cylinder 5, a gap for circulation of drilling fluid is reserved between the cylinder walls of the inner cylinder and the outer cylinder 5, the core claw assembly 7 is connected to the bottom of the inner cylinder 6, and the coring bit 8 is connected to the bottom of the outer cylinder 5.
The safe pressure relief closed coring tool further comprises a joint component 2, a balance piston 3 and a sealing component 9, the top of the outer cylinder 5 and the top of the inner cylinder 6 are both connected to the joint component 2, and the balance piston 3 is arranged in the joint component 2 and used for sealing the inner cylinder 6; the balance piston 3 is connected with the joint component 2 in a sealing mode through a first sealing ring 4, and the first sealing ring 4 is a Y-shaped sealing ring. The balance piston 3 is provided with a first flow through hole 32, the joint component 2 is provided with a second flow through hole 21, the second flow through hole 21 is communicated with a gap between the outer cylinder 5 and the inner cylinder 6, and the first flow through hole 32 and the second flow through hole 21 are used for circulating drilling fluid. The joint component 2 is provided with a pressure relief hole 22, the pressure relief hole 22 is positioned at the lower side of the second flow through hole 21, and the pressure relief hole 22 is communicated with the outer cylinder 5 and the inner cylinder 6 and is used for relieving the pressure suddenly increased when the rock core enters the inner cylinder 6. The top of the joint component 2 is connected with a thread protecting sleeve 1 for protecting the joint component 2.
The sealing assembly 9 is arranged at the bottom of the inner cylinder 6, a second sealing ring 92 is arranged on the sealing assembly 9, and the sealing assembly 9 is connected to the inner wall of the coring bit 8 in a sealing mode through the second sealing ring 92; the sealing component 9 is fixedly connected with the coring bit 8 through a positioning pin. And a notch 91 is formed in the sealing assembly 9 and used for allowing the core sealing liquid to pass through. In the present embodiment, the positioning member 93 is preferably a positioning pin. Of course, the positioning member 93 may alternatively be other members, such as a set screw, etc. The positioning pins can also be arranged in other numbers, such as four positioning pins which are evenly arranged on the peripheral side of the coring bit 8 at intervals, so that better stability is achieved.
When the scheme is used, the drilling tool is integrally assembled, the core sealing liquid is added into the inner barrel through the joint component 2, the core sealing liquid is filled in the inner barrel, the first sealing ring 32 is in sealing connection with the core jaw assembly 4, and the core sealing liquid cannot flow out of the inner barrel 6. After the inner cylinder 6 is filled with the core sealing liquid, the balance piston 3 is filled, and the core sealing liquid cannot overflow from the inner cylinder 6 in the coring process because the balance piston 3 is hermetically connected with the joint component 2 through the Y-shaped sealing ring 4. After the drilling tool is assembled, the drilling tool is put into the bottom of the well, drilling fluid is introduced into the drilling tool, and drilling operation is started. The drilling fluid enters between the joint component 2 and the balance piston 3 through the first flow through hole 32, then enters into the clearance space between the inner cylinder 6 and the outer cylinder 5 through the second flow through hole 21, reaches the coring bit 8 at the lowest end of the drilling tool, and plays roles of cooling and lubricating. During drilling, the bottom end of the sealing assembly 9 is firstly contacted with the well bottom, reaction force of a rock stratum is transmitted to the positioning pin along with the whole downward movement of the drilling tool, so that the positioning pin is broken, after the positioning pin is broken, the fixed relation between the sealing assembly 9 and the coring bit 8 fails, the sealing assembly 9 is separated from the coring bit 8 and moves towards the inner cylinder 6 at the upper side, the second sealing ring 92 is separated from the inner wall of the coring bit 8, so that the sealing effect of the sealing assembly 9 on the inner cylinder 6 fails, core sealing liquid flows downwards from the gap 91 and the gap between the sealing assembly 9 and the inner cylinder 2, a protection zone is formed in a footage area at the well bottom, along with the coring, the core gradually pushes the sealing assembly 9 upwards, then enters the inner cylinder 2 and moves upwards along the inner cavity of the inner cylinder 2, the core sealing liquid in the inner cylinder 2 is replaced by the core with the same volume, and a layer of core sealing liquid, the effect of isolating the rock core from the drilling fluid is achieved, and finally the stratum rock core which is not polluted by the drilling fluid is obtained. In the process that the rock core moves upwards in the inner cavity of the inner cylinder 6, air, rock core sealing liquid and drilling fluid in the inner cylinder 6 are extruded to enter a gap between the inner cylinder 6 and the outer cylinder 5 from the pressure relief hole 22, so that safe pressure relief in the inner cylinder 6 is realized, and pressure building accidents in the inner cylinder 6 are avoided.
Example 2
This embodiment only illustrates the differences from the previous embodiments, and the same contents are not repeated.
Referring to fig. 4, the utility model provides a safe airtight coring tool of pressure release, 3 sliding connection of balance piston in connect 2 inner walls of subassembly, 3 bottoms of balance piston shelter from pressure release hole 22, 3 tops of balance piston are connected with pressure spring 31, and the other end butt of pressure spring 31 is in balance piston 3's upside drilling tool.
This scheme is when using, and balanced piston 3 initial condition is because under its action of gravity, balanced piston 3 is in the bottommost of its activity stroke to sheltered from pressure release hole 22, pressure spring 31 is in the natural stretching state, and drilling fluid can not enter into inner tube 6 by pressure release hole 22 at the circulation in-process this moment, has avoided the drilling fluid to sneak into in the airtight liquid of rock core, thereby has ensured the quality of airtight liquid of rock core, has played the best guard action to the rock core.
Referring to fig. 5, when the coring operation is performed, the core gradually moves upward in the inner cylinder 6, the pressure in the inner cylinder 6 is gradually increased, the balance piston 3 is pushed to move upward to expose the pressure relief hole 22, and the generated pressure-building air and the core sealing liquid enter the gap between the outer cylinder 5 and the inner cylinder 6, so that the safe pressure relief is realized. It should be further noted that, when the upward thrust exerted on the pressure spring 31 and the balance piston 3 is balanced, the balance piston 3 does not move upward any more, and the pressure relief hole 22 is always in an open state; when the drilling footage is gradually reduced until coring is completed, because the pressure build-up condition in the inner cylinder 6 is weaker and weaker, the pressure spring 31 can rebound gradually to push the balance piston 3 to move downwards, and shield the pressure relief hole 22, and the inner cylinder 6 is sealed again, so that the drilling fluid is prevented from entering the inner cylinder 6 from the pressure relief hole 22.
Claims (7)
1. A safe pressure relief closed coring tool comprises an outer cylinder (5), an inner cylinder (6), a core claw assembly (7) and a coring drill bit (8), wherein the inner cylinder (6) is sleeved in the outer cylinder (5), a gap for circulation of drilling fluid is reserved between the cylinder walls of the inner cylinder and the outer cylinder, the core claw assembly (7) is connected to the bottom of the inner cylinder (6), and the coring drill bit (8) is connected to the bottom of the outer cylinder (5); the method is characterized in that:
the safe pressure relief closed coring tool further comprises a joint component (2), a balance piston (3) and a sealing component (9), the top of the outer cylinder (5) and the top of the inner cylinder (6) are both connected to the joint component (2), and the balance piston (3) is arranged in the joint component (2) and used for sealing the inner cylinder (6); a first flow through hole (32) is formed in the balance piston (3), a second flow through hole (21) is formed in the joint component (2), the second flow through hole (21) is communicated with a gap between the outer cylinder (5) and the inner cylinder (6), and the first flow through hole (32) and the second flow through hole (21) are used for circulating drilling fluid;
the sealing assembly (9) is arranged at the bottom of the inner cylinder (6), and the sealing assembly (9) is connected to the inner wall of the inner cylinder (6), the inner wall of the core gripper assembly (7) or the inner wall of the coring bit (8) in a sealing manner; the sealing assembly (9) is fixedly connected with the coring bit (8) through at least one positioning component (93);
the joint component (2) is provided with a pressure relief hole (22), the pressure relief hole (22) is located on the lower side of the second flow through hole (21), and the pressure relief hole (22) is communicated with the outer cylinder (5) and the inner cylinder (6) and used for relieving the pressure suddenly increased when the rock core enters the inner cylinder (6).
2. A safety vented closed core coring tool as in claim 1 wherein: the top of the joint component (2) is connected with a thread protecting sleeve (1) for protecting the joint component (2).
3. A safety vented closed core coring tool as in claim 1 wherein: balance piston (3) sliding connection in connect subassembly (2) inner wall, balance piston (3) bottom shelters from pressure release hole (22), and balance piston (3) top is connected with pressure spring (31), and the other end butt of pressure spring (31) is in the upside drilling tool of balance piston (3).
4. A safety vented closed core coring tool as claimed in claim 1 or 3 wherein: the balance piston (3) is connected with the joint component (2) in a sealing mode through a first sealing ring (4).
5. A safety vent closed coring tool as set forth in claim 4, wherein: the first sealing ring (4) is a Y-shaped sealing ring.
6. A safety vented closed core coring tool as in claim 1 wherein: and a second sealing ring (92) is arranged on the sealing component (9), and the sealing component (9) is in sealing connection with the inner wall of the coring bit (8) through the second sealing ring (92).
7. A safety vented closed core coring tool as in claim 1 wherein: and a notch (91) is formed in the sealing assembly (9) and used for allowing the core sealing liquid to pass through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920946744.0U CN210622747U (en) | 2019-06-21 | 2019-06-21 | Airtight coring tool of safe pressure release |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920946744.0U CN210622747U (en) | 2019-06-21 | 2019-06-21 | Airtight coring tool of safe pressure release |
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| CN210622747U true CN210622747U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920946744.0U Active CN210622747U (en) | 2019-06-21 | 2019-06-21 | Airtight coring tool of safe pressure release |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720084A (en) * | 2020-06-30 | 2020-09-29 | 中国石油天然气集团有限公司 | Horizontal well is shunted linkage for coring |
| CN113503136A (en) * | 2021-07-08 | 2021-10-15 | 中国海洋石油集团有限公司 | Piston type pressure relief structure and well drilling coring tool with same |
-
2019
- 2019-06-21 CN CN201920946744.0U patent/CN210622747U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720084A (en) * | 2020-06-30 | 2020-09-29 | 中国石油天然气集团有限公司 | Horizontal well is shunted linkage for coring |
| CN113503136A (en) * | 2021-07-08 | 2021-10-15 | 中国海洋石油集团有限公司 | Piston type pressure relief structure and well drilling coring tool with same |
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