CN214886947U - Well drilling heat preservation shape-preserving coring tool - Google Patents
Well drilling heat preservation shape-preserving coring tool Download PDFInfo
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- CN214886947U CN214886947U CN202121124737.6U CN202121124737U CN214886947U CN 214886947 U CN214886947 U CN 214886947U CN 202121124737 U CN202121124737 U CN 202121124737U CN 214886947 U CN214886947 U CN 214886947U
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Abstract
The utility model provides a well drilling heat preservation shape-preserving coring tool. Relates to the technical field of petroleum and natural gas drilling. The core tube comprises a drilling tool outer tube, a control rod, a cold source cavity tube, a pressure maintaining cavity tube, a core tube and a core barrel, wherein a capsule is sleeved on the inner wall of the core barrel, the upper part of the capsule is fixed on the tube wall of the core barrel, and the lower port of the capsule is pressed in an annular groove formed in the joint surface of the core barrel and the core tube after being curled. The utility model discloses following beneficial effect has: sealing a coring barrel of the drilling tool by adopting a flap valve, wrapping the coring barrel by adopting a capsule shrinkage natural gas hydrate core, keeping the original pressure and physical properties of the natural gas hydrate core, and freezing the natural gas hydrate core to-40 ℃ by adopting low-temperature phase-change liquid as a cold source; the fidelity degree and the coring success rate of the natural gas hydrate core are improved by adopting the double effects of freezing and pressure maintaining.
Description
The technical field is as follows:
the utility model belongs to the technical field of the oil and gas drilling technique and specifically relates to a well drilling heat preservation type coring tool.
Background art:
the natural gas hydrate can only exist under certain temperature and pressure conditions, the temperature is generally required to be lower than 0-10 ℃, the pressure is higher than 10MPa, once the temperature is increased or the pressure is reduced, methane gas escapes, and the solid natural gas hydrate is decomposed, so that how to obtain a high-fidelity natural gas hydrate core is a great problem in hydrate exploration and development;
at present, the idea for the natural gas hydrate is to inhibit the decomposition of the natural gas hydrate through low temperature, adopt phase-changeable fluid as a cold source, store the cold source in a cold storage cavity of a drilling tool, after drilling, trigger a control mechanism, inject the cold source into a freezing cavity, freeze the natural gas hydrate in a core tube to a required low-temperature interval through the vaporization and heat absorption of the cold source, ensure that the natural gas hydrate is not decomposed in the sampling process, and adopt the method to change the original basic physical properties of the natural gas hydrate core, so that the test data of sound waves, resistivity and the like of the natural gas hydrate core are changed, and the analysis and the test of the later partial properties are not facilitated.
The utility model has the following contents:
in order to solve the problem, the utility model provides a well drilling heat preservation shape-preserving coring tool.
The technical scheme of the utility model is that: a well drilling heat preservation and shape protection coring tool comprises a drilling tool outer cylinder, wherein a drill bit is arranged at the bottom of the drilling tool outer cylinder, a control rod is arranged on the inner side of the drilling tool outer cylinder, the upper part of the control rod is of a hollow structure, a drilling fluid inlet communicated with the hollow structure at the upper part of the control rod is arranged on the control rod, a boss is arranged at the upper part of the control rod, the diameter of the boss is larger than the inner diameter of a concave table at the upper part of the drilling tool outer cylinder, the control rod is hung on the concave table of the drilling tool outer cylinder, a cold source cavity pipe is arranged at the lower part of the control rod, a sealing ring is arranged between the outer circle of the cold source cavity pipe and the inner hole of the drilling tool outer cylinder, a pressure maintaining sealing ring is arranged between the central hole of the cold source cavity pipe and the control rod, the lower part of the cold source cavity pipe is in threaded sealing connection with the pressure maintaining cavity pipe, a flip valve is arranged at the lower part of the pressure maintaining cavity pipe, a torsion spring is arranged on a connecting shaft of the flip valve, and the lower part of the cavity pipe is connected with a core pipe, and the bottom of the core pipe is connected with cutting teeth;
the inner part of the core tube is connected with a core barrel in a clearance fit mode through a pin shaft, the core barrel is provided with a central hole, and a control rod penetrates through the central hole and extends into the lower portion of the core barrel to be fixedly connected with a piston.
The cold source cavity tube is of a hollow structure, a spring thimble valve is arranged at the lower part of the cavity, when a valve rod at the lower part of the spring thimble valve is jacked up, the cavity of the cold source cavity tube is communicated with the outside, a cold source in the cavity of the cold source cavity tube is phase-change liquid, and the phase-change liquid adopts an alcohol-dry ice mixture with the temperature of 0 ℃ to minus 120 ℃, an acetone-dry ice mixture with the temperature of 0 ℃ to minus 130 ℃ and liquid nitrogen with the temperature of minus 197 ℃ to gasify and absorb heat.
The inner wall of the core barrel is sleeved with a capsule, the upper part of the capsule is fixed on the pipe wall of the core barrel, and the lower port of the capsule is pressed in an annular groove formed on the joint surface of the core barrel and the core barrel after being curled.
The inner wall of the core barrel is provided with a heat preservation layer I, and the upper part of the flip valve is provided with a heat preservation layer II.
The utility model discloses following beneficial effect has: sealing a coring barrel of the drilling tool by adopting a flap valve, wrapping the coring barrel by adopting a capsule shrinkage natural gas hydrate core, keeping the original pressure and physical properties of the natural gas hydrate core, and freezing the natural gas hydrate core to-40 ℃ by adopting low-temperature phase-change liquid as a cold source; the fidelity degree and the coring success rate of the natural gas hydrate core are improved by adopting the double effects of freezing and pressure maintaining.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural diagram of the middle spring top needle valve of the present invention.
In the figure, 1-a drilling tool outer cylinder, 2-a control rod, 3-a cold source cavity tube, 4-a pressure maintaining cavity tube, 5-a core tube, 6-a core barrel, 7-a drill bit, 8-a cutting tooth, 9-an annular groove, 10-a pin shaft, 11-a capsule, 12-a piston, 13-an insulating layer I, 14-a flip valve, 15-an insulating layer II, 16-a spring top needle valve and 17-a drilling fluid inlet.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings:
as shown by combining the figure 1 with the figure 2, the well drilling heat-preservation and shape-preservation coring tool comprises a drilling tool outer cylinder 1, a drilling bit 7 is arranged at the bottom of the drilling tool outer cylinder 1, a control rod 2 is arranged on the inner side of the drilling tool outer cylinder 1, the upper part of the control rod 2 is of a hollow structure, a drilling fluid inlet 17 communicated with the hollow structure on the upper part of the control rod 2 is arranged on the control rod 2, a boss is arranged on the upper part of the control rod 2, the diameter of the boss is larger than the inner diameter of a concave table on the upper part of the drilling tool outer cylinder 1, the control rod 2 is hung on the concave table of the drilling tool outer cylinder 1, a cold source cavity pipe 3 is arranged on the lower part of the control rod 2, a sealing ring is arranged between the outer circle of the cold source cavity pipe 3 and the inner hole of the drilling tool outer cylinder 1, a sealing ring is arranged between the central hole of the cold source cavity pipe 3 and the control rod 2, the lower part of the cold source cavity pipe 3 is in threaded sealing connection with a pressure-preservation cavity pipe 4, a flip valve 14 is arranged on the lower part of the pressure-preservation cavity pipe 4, and a torsion spring is arranged on a connecting shaft of the flip valve 14, the lower part of the pressure-maintaining cavity pipe 4 is in threaded connection with a core pipe 5, and the bottom of the core pipe 5 is connected with cutting teeth 8;
the interior of the core tube 5 is connected with a core barrel 6 in a clearance fit manner through a pin shaft 10, the core barrel 6 is provided with a central hole, and the control rod 2 penetrates through the central hole and extends into the lower part of the core barrel 6 to be fixedly connected with a piston 12.
The cold source cavity pipe 3 is of a hollow structure, the spring top needle valve 16 is arranged at the lower part of the cavity, when the valve rod at the lower part of the spring top needle valve 16 is jacked up, the cavity of the cold source cavity pipe 3 is communicated with the outside, the cold source in the cavity of the cold source cavity pipe 3 is phase-change liquid, and the phase-change liquid adopts low-temperature fluids which can be gasified and absorb heat, such as alcohol-dry ice mixture with the temperature of 0 ℃ to 120 ℃ below zero, acetone-dry ice mixture with the temperature of 0 ℃ to 130 ℃ below zero, liquid nitrogen with the temperature of 197 ℃ below zero, and the like.
The inner wall of the core barrel 6 is sleeved with a capsule 11, the upper part of the capsule 11 is fixed on the tube wall of the core barrel 6, and the lower port of the capsule 11 is pressed in an annular groove 9 formed on the joint surface of the core barrel 6 and the core tube 5 after being curled.
The inner wall of the core barrel 6 is provided with an insulating layer I13, and the upper part of the flap valve 14 is provided with an insulating layer II 15.
After the cold source is filled, a boss on the upper part of the control rod 2 is seated on a concave table of the outer cylinder 1 of the drilling tool, and a distance of 2-4 mm is kept between the cutting teeth 8 and the hole bottom; at the moment, the drilling fluid is not circulated, and the cold source is stored in the cold source cavity pipe 3; the flap valve 14 presses on the control rod 2.
Starting a pump to circulate drilling fluid, wherein the drilling fluid enters a space defined by the control rod 2, the drilling tool outer cylinder 1 and the cold source cavity pipe 3 from a drilling fluid inlet 17 at the upper part of the control rod 2, the hydrostatic pressure above the cold source cavity pipe 3 is gradually increased to push the cold source cavity pipe 3 to move downwards, and the cutting teeth 8 cut the natural gas hydrate stratum under the action of the hydrostatic pressure; at this time, the control rod 2 cannot move downwards due to the obstruction of the outer cylinder 1 of the drilling tool, so that the piston 12 gradually rises relative to the core barrel 6; obtaining a natural gas hydrate core under the action of the cutting teeth 8; then, the natural gas hydrate core gradually enters the core barrel 6 under the action of suction generated when the piston 12 moves upwards relative to the core barrel 6, so that the condition that the water natural gas hydrate core is deformed due to friction between the natural gas hydrate core and the side wall of the core barrel 6 is weakened; after the cutting teeth 8 drive the core barrel 6 to be completely pressed into the natural gas hydrate stratum, the core barrel 6 is filled with the natural gas hydrate core, and the piston 12 reaches the uppermost part of the core barrel 6; in the process, the pin shaft 10 between the core barrel 6 and the core barrel 5 is broken, the core barrel 6 moves upwards, the lower port of the capsule 11 is separated from the annular groove 9 and then shrinks to the bottom of the natural gas hydrate core to wrap the natural gas hydrate and isolate the natural gas hydrate from the outside;
after drilling and coring are finished, a fisher is put in, a fishing hook of the fisher is clamped in a groove in the upper part of the control rod 2, the fisher is lifted, the fisher drives the control rod 2 to move upwards, and meanwhile, the piston 12 drives the coring barrel 6 to move upwards; the core barrel 6 gradually enters the pressure-maintaining cavity pipe 4, after the core barrel 6 completely enters the pressure-maintaining cavity pipe 4, the lower part of the pressure-maintaining cavity pipe 4 is sealed by the flip valve 14 under the action of the torsion spring, at the moment, the pressure in the pressure-maintaining cavity pipe 4 is the original pressure of the natural gas hydrate reservoir stratum, the top of the core barrel 6 jacks up the valve rod of the spring-loaded needle valve 16, the cold source in the cold source cavity pipe 3 is released, the cold source is gasified to absorb heat in a large amount to freeze the natural gas hydrate core to be below-40 ℃ so as to ensure that the natural gas hydrate core is not decomposed, test data such as sound waves, resistivity and the like of the natural gas hydrate core are prevented from changing, and the later analysis and test of partial properties are not facilitated.
Claims (4)
1. The utility model provides a well drilling heat preservation type coring tool, includes drilling tool urceolus (1), its characterized in that: the bottom of the outer cylinder (1) of the drilling tool is provided with a drill bit (7), the inner side of the outer cylinder (1) of the drilling tool is provided with a control rod (2), the upper part of the control rod (2) is of a hollow structure, the control rod (2) is provided with a drilling fluid inlet (17) communicated with the hollow structure at the upper part of the control rod, the upper part of the control rod (2) is provided with a boss, the diameter of the boss is larger than the inner diameter of a concave table at the upper part of the outer cylinder (1) of the drilling tool, the control rod (2) is hung on the concave table of the outer cylinder (1) of the drilling tool, the lower part of the control rod (2) is provided with a cold source cavity tube (3), a sealing ring is arranged between the excircle of the cold source cavity tube (3) and the inner hole of the outer cylinder (1) of the drilling tool, a sealing ring is arranged between the central hole of the cold source cavity tube (3) and the control rod (2), the lower part of the cold source cavity tube (3) is in threaded sealing connection with a pressure-maintaining cavity tube (4), the lower part of the pressure-maintaining cavity tube (4) is provided with a flip valve (14), and a torsion spring is arranged on a connecting shaft of the flip valve (14), the lower part of the pressure-maintaining cavity tube (4) is in threaded connection with a core tube (5), and the bottom of the core tube (5) is connected with cutting teeth (8);
the core tube (5) is connected with the core barrel (6) through a pin shaft (10) in a clearance fit manner, the core barrel (6) is provided with a central hole, and the control rod (2) penetrates through the central hole and extends into the lower part of the core barrel (6) to be fixedly connected with the piston (12).
2. The drilling heat-preserving coring tool of claim 1, wherein: the cold source cavity pipe (3) is of a hollow structure, a spring top needle valve (16) is arranged at the lower part of the cavity, when a valve rod at the lower part of the spring top needle valve (16) is jacked up, the cavity of the cold source cavity pipe (3) is communicated with the outside, a cold source in the cavity of the cold source cavity pipe (3) is phase-change liquid, and the phase-change liquid adopts an alcohol-dry ice mixture with the temperature of 0 ℃ to 120 ℃ below zero, an acetone-dry ice mixture with the temperature of 0 ℃ to 130 ℃ below zero and liquid nitrogen with the temperature of 197 ℃ below zero and can be gasified to absorb heat.
3. The drilling heat-preserving coring tool of claim 1, wherein: the inner wall of the core barrel (6) is sleeved with a capsule (11), the upper part of the capsule (11) is fixed on the pipe wall of the core barrel (6), and the lower port of the capsule (11) is crimped and then pressed in an annular groove (9) formed in the joint surface of the core barrel (6) and the core pipe (5).
4. The drilling heat-preserving coring tool of claim 1, wherein: the inner wall of the core taking barrel (6) is provided with a heat preservation layer I (13), and the upper part of the flip valve (14) is provided with a heat preservation layer II (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121124737.6U CN214886947U (en) | 2021-05-24 | 2021-05-24 | Well drilling heat preservation shape-preserving coring tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121124737.6U CN214886947U (en) | 2021-05-24 | 2021-05-24 | Well drilling heat preservation shape-preserving coring tool |
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| Publication Number | Publication Date |
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| CN214886947U true CN214886947U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121124737.6U Active CN214886947U (en) | 2021-05-24 | 2021-05-24 | Well drilling heat preservation shape-preserving coring tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116181262A (en) * | 2022-12-19 | 2023-05-30 | 四川大学 | In-situ film-forming quality-guaranteeing coring device and coring method for combustible ice |
| CN116181262B (en) * | 2022-12-19 | 2024-05-10 | 四川大学 | In-situ film-forming quality-guaranteeing coring device and coring method for combustible ice |
-
2021
- 2021-05-24 CN CN202121124737.6U patent/CN214886947U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116181262A (en) * | 2022-12-19 | 2023-05-30 | 四川大学 | In-situ film-forming quality-guaranteeing coring device and coring method for combustible ice |
| CN116181262B (en) * | 2022-12-19 | 2024-05-10 | 四川大学 | In-situ film-forming quality-guaranteeing coring device and coring method for combustible ice |
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