CN115126433B - Plug-in pressure maintaining corer suitable for soft stratum and use method thereof - Google Patents
Plug-in pressure maintaining corer suitable for soft stratum and use method thereof Download PDFInfo
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- CN115126433B CN115126433B CN202210867562.0A CN202210867562A CN115126433B CN 115126433 B CN115126433 B CN 115126433B CN 202210867562 A CN202210867562 A CN 202210867562A CN 115126433 B CN115126433 B CN 115126433B
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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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/10—Formed core retaining or severing means
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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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to an inserted pressure-maintaining corer suitable for a soft stratum and a use method thereof, wherein the inserted pressure-maintaining corer comprises a corer outer tube, a core tube, a penetration boot, a flap valve, a pressure-maintaining inner tube and a piston with a pressure-measuring pressure-relieving interface: the piston and the flap valve are arranged in the outer tube of the coring device, the piston is connected with the outer tube of the coring device through a pin, the upper end of the core barrel is connected with the piston, and the penetration boot is connected with the lower end of the core barrel; the lower end of the pressure maintaining inner pipe is propped against the valve seat, the pressure maintaining valve cover is limited in the annular space between the pressure maintaining inner pipe and the outer pipe of the corer, the piston can enter the pressure maintaining inner pipe under the action of external force and is in sealing fit with the pressure maintaining inner pipe, and the pressure maintaining inner pipe can move to be in sealing fit with the outer pipe of the corer under the action of external force; and when the pressure maintaining inner pipe moves to a certain height, the flap valve is closed. According to the method, the piston is driven by utilizing hydraulic pressure, so that the core pipe and the penetrating shoe are driven to penetrate into a soft stratum, and the pressure-maintaining core is obtained; the overflow hole can effectively prevent the damage of a well bottom tool; the pressure measuring and releasing interface is convenient for pressure measurement and safety pressure relief, and can improve the safety performance.
Description
Technical Field
The invention relates to the technical field of pressure-maintaining coring, in particular to an inserted pressure-maintaining coring device suitable for soft stratum and a use method thereof.
Background
Core is an important physical geological data for researching and knowing underground geology and mineral conditions.
Proper amount of wells must be selected in the oilfield range, and a certain amount of cores are drilled for relevant oil and gas layer positions, so that the following can be known through observation, analysis and research: (1) the age, lithology and sedimentary character of the formation; (2) physical and chemical properties of the reservoir and oil, gas and water conditions; (3) oil layer characteristics and oil index; (4) underground construction conditions (e.g., faults, joints, dip angles, etc.); (5) qualitative and quantitative interpretation basic data of various logging methods; (6) oil, gas, water movement and distribution conditions during the production process, and formation structure changes; the core can also be used for water injection or indoor experimental analysis of various methods for improving recovery ratio and measures for increasing yield and injection, and is essential basic data for estimating petroleum reserves, compiling reasonable development schemes and improving the water injection development effect and recovery ratio of oil reservoirs.
Core drilling refers to a drilling method in which cores are carved and removed during drilling to study the geological conditions of the subsurface. Core drilling is typically rotary drilling, in which rock is cut, ground, broken up in various ways using a drilling machine, such that a drill bit continuously drills and drills a core deep into a formation.
However, when the hardness of the target stratum is soft or hard, and the medium-hard stratum with uniform lithology and better pillaries is core-taken, the hydraulic motor is commonly used for driving the drill bit to drill forward and then pulling the core. For loose and soft stratum, the modes of mechanical pressurization type coring, hydraulic pressurization type coring, totally-enclosed coring and the like are mainly adopted, and the ball valve pressure maintaining or pressure-maintaining-free coring effect is mainly adopted for the coring modes of the loose and soft stratum, so that the ball valve pressure maintaining has the difficult problem of small coring diameter, and the pressure-maintaining-free coring is difficult to meet the current requirements.
Disclosure of Invention
The utility model provides an acquisition for adaptation soft stratum pressurize rock core provides a male pressure maintaining corer, and it utilizes hydraulic drive piston, drives core pipe and penetration boots and penetrates soft stratum to acquire the pressurize rock core.
The application is realized by the following technical scheme:
the utility model provides an inserted pressurize corer suitable for soft stratum, includes corer outer tube, core barrel, penetration boot, flap valve, pressurize inner tube and piston:
the outer tube of the corer is provided with a lower limit structure for limiting the downward movement of the piston and a first upper limit structure for limiting the upward movement of the pressure maintaining inner tube, and the first upper limit structure is positioned above the lower limit structure;
the piston is arranged in the outer tube of the coring device, the piston is provided with a first sealing ring, the piston and the outer tube of the coring device are connected together through a pin, and the piston is provided with a connecting structure for connecting the lifting device;
the upper end of the core barrel is connected with the piston, and the penetration boot is connected with the lower end of the core barrel;
the flap valve comprises a valve seat and a pressure maintaining valve cover, the valve seat is connected with the outer tube of the corer, one side of the pressure maintaining valve cover is movably connected with one side of the top of the valve seat, and the top of the valve seat is provided with a valve seat sealing surface which is matched with the pressure maintaining valve cover;
the lower end of the pressure maintaining inner pipe is propped against the valve seat, the pressure maintaining valve cover is limited in the annular space between the outer wall of the pressure maintaining inner pipe and the inner wall of the outer pipe of the corer, and a spring is arranged or not arranged between the pressure maintaining valve cover and the outer pipe of the corer; the piston can penetrate through the valve seat under the action of external force to enter the pressure-maintaining inner pipe and is in sealing fit with the pressure-maintaining inner pipe, and the second upper limit structure is arranged in the pressure-maintaining inner pipe and used for limiting the upward movement of the piston; the pressure maintaining inner pipe can move to prop against the first upper limit structure under the action of external force and is in sealing fit with the outer pipe of the corer; when the pressure maintaining inner pipe moves to a certain height in the outer pipe of the corer, the pressure maintaining valve cover is out of limit and falls back to the top of the valve seat to be matched with the valve seat in a sealing way.
Optionally, the inner wall of the outer tube of the coring device is provided with a first shoulder to form the lower limit structure, the inner wall of the pressure maintaining inner tube is provided with a second shoulder to form the second upper limit structure, the inner wall of the outer tube of the coring device is provided with a third shoulder to form the first upper limit structure, the second shoulder is located above the first shoulder, and the third shoulder is located above the second shoulder.
Optionally, a second sealing ring is installed on the third shoulder, and when the upper end of the pressure maintaining inner pipe moves to prop against the third shoulder, the second sealing ring is used for realizing sealing between the third shoulder and the third shoulder.
In particular, the pipe wall of the outer pipe of the corer is provided with at least one overflow hole penetrating through the inner wall and the outer wall of the outer pipe, the overflow hole is positioned above the lower limiting structure, and the axial distance between the overflow hole and the lower limiting structure is larger than the axial thickness of the piston.
Optionally, the outer tube of the coring device is provided with an outer tube upper section and an outer tube lower section, and the lower end of the outer tube upper section is in threaded connection with the upper end of the outer tube lower section; the inner diameter of the upper section of the outer tube is larger than the diameter of the lower section of the outer tube, the lower section of the outer tube can be in sealing fit with the piston, the first shoulder, the overflow hole and the pin hole are arranged on the lower section of the outer tube, the third shoulder is arranged on the upper section of the outer tube, and the pressure maintaining inner tube is arranged in the upper section of the outer tube.
Optionally, the pressurize inner tube has first section, second section and the third section of integrated into one piece, and first section, second section and third section connect gradually, and the diameter of first section, second section and third section reduces in proper order, and the junction of first section and second section forms limit structure on the second, and the second section can seal the cooperation with the piston.
Optionally, the piston is provided with a pressure measuring and pressure releasing interface, the pressure measuring and pressure releasing interface penetrates through the upper surface and the lower surface of the piston, and a one-way valve is arranged at the pressure measuring and pressure releasing interface. The one-way valve can be selected from the existing one-way valves.
Specifically, the pressure measuring and relieving interface comprises a valve cavity, a first pore canal and a second pore canal, wherein the lower end of the first pore canal penetrates through the lower surface of the piston, the upper end of the first pore canal penetrates through the valve cavity, the upper end of the second pore canal penetrates through the upper surface of the piston, and the lower end of the second pore canal penetrates through the valve cavity;
the check valve comprises a valve core and a second spring, the valve cavity is a stepped hole, the valve core is matched with a small hole of the valve cavity, a valve core sealing ring which is used for being in sealing fit with the hole wall is arranged on the valve core, and the second spring is arranged in a large hole of the valve cavity; the valve core is positioned above the second spring, and under the action of the second spring, the valve core is arranged in a small hole of the valve cavity and is propped against an inner shoulder of the pressure measuring and relieving interface.
In particular, the piston has two types: the first, the diameter of the second pore canal is smaller than the diameter of the valve cavity, the diameter of the first pore canal is larger than or equal to the diameter of the valve cavity, a thread head with an axial through hole is arranged in the second pore canal, the thread head is in threaded connection with the first pore canal, the lower end of the second spring is propped against the thread head, and under the action of the second spring, the valve core is propped against a shoulder at the joint of the second pore canal and the valve cavity; the one-way valve comprises or does not comprise a valve rod matched with the second pore canal, the valve rod is arranged in the second pore canal, and the lower end of the valve rod is connected with the valve core;
the second, the diameter of the first pore canal is smaller than the diameter of the valve cavity, the diameter of the second pore canal is larger than or equal to the diameter of the valve cavity, the second pore canal is internally provided with a thread head with an axial through hole, the thread head is in threaded connection with the second pore canal, the lower end of the second spring is propped against the inner shoulder of the joint of the first pore canal and the valve cavity, and under the action of the second spring, the valve core is propped against the thread head; the one-way valve comprises or does not comprise a valve rod matched with the second pore canal, the valve rod is arranged in the axial through hole, and the lower end of the valve rod is connected with the valve core.
The application method of the inserted pressure maintaining corer suitable for the soft stratum comprises the following steps:
after the corer is lowered to a target coring stratum, drilling fluid is introduced, the drilling fluid has a tendency of driving a piston to move downwards, then a pin is sheared, after the pin is sheared, the piston moves downwards under the action of the drilling fluid, and the core barrel and the penetrating shoe are driven to perform coring movement downwards, so that the obtained core barrel enters the core barrel;
after the rock core completely enters the rock core pipe, the lower end of the piston is also located on the lower limiting structure of the outer pipe of the coring device, and when the overflow hole is arranged on the outer pipe of the coring device, drilling fluid flows out of the outer pipe of the coring device through the overflow hole;
after the rock core completely enters the rock core pipe, connecting a piston at a wellhead through a lifting device;
the piston is lifted upwards by the lifting device, the piston, the core barrel, the penetrating shoe and the core are driven to move upwards, so that the core enters the pressure maintaining inner pipe, and the piston is sealed with the pressure maintaining inner pipe;
continuously lifting upwards to drive the pressure maintaining inner pipe to synchronously move upwards, wherein the upper end of the pressure maintaining inner pipe is seated on a first upper limit structure of the outer pipe of the corer, the piston is seated on a second upper limit structure of the pressure maintaining inner pipe, and the upper end of the pressure maintaining inner pipe is sealed with the outer pipe of the corer by means of a second sealing ring; meanwhile, the pressure maintaining inner pipe moves upwards to pass through the flap valve, space is provided for overturning the pressure maintaining valve cover, and the pressure maintaining valve cover is overturned to seal the lower end after closing the valve seat, so that a pressure maintaining space is formed.
Compared with the prior art, the application has the following beneficial effects:
1, driving a piston by utilizing hydraulic pressure to drive a core barrel and a penetration boot to penetrate into a soft stratum so as to obtain a pressure-maintaining core; the lower end pressure maintaining seal is realized by adopting the flap valve, so that the problem of small coring diameter caused by the ball valve can be solved;
2, after the rock core enters the rock core pipe, the overflow hole is automatically opened, so that the damage to a well bottom tool caused by well bottom pressure holding can be effectively avoided;
3, this application is equipped with pressure measurement pressure release interface, is convenient for pressure measurement and safety release, can improve the security performance.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the invention.
FIG. 1 is a schematic diagram of the structure of an insert-type pressure-maintaining corer in an initial state in an embodiment;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of the structure of the embodiment in which the flap valve and the pressure maintaining inner tube are housed in the outer tube of the corer;
FIG. 4 is a schematic structural view of a pressure-retaining inner tube in an embodiment;
FIG. 5 is a schematic illustration of the construction of the check valve and first piston of the embodiment;
FIG. 6 is a schematic view of a first piston configuration in an embodiment;
FIG. 7 is a schematic illustration of the construction of a check valve and a second piston in an embodiment;
FIG. 8 is a schematic view of a second piston configuration in an embodiment;
FIG. 9 is a schematic diagram of the structure of the insert-type pressure maintaining corer as it has just acquired a core in an embodiment;
FIG. 10 is a schematic view of the structure of the lifting device in connection with the insertion pressure maintaining corer in an embodiment;
FIG. 11 is a schematic view of the structure of the piston and core barrel during the upward lifting process in the embodiment;
FIG. 12 is a schematic view of the structure of the embodiment with the pressure retention inner tube raised against the outer tube of the corer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships conventionally put in place when the inventive product is used, or directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the insertion pressure-maintaining corer suitable for soft stratum disclosed in this embodiment comprises a corer outer tube 1, a core tube 2, a penetration boot 3, a flap valve 4, a pressure-maintaining inner tube 5 and a piston 6.
The rock core pipe 2, the pressure maintaining inner pipe 5 and the piston 6 are all positioned in the outer pipe 1 of the corer, the flap valve 4 is arranged on the outer pipe 1 of the corer, the upper end of the rock core pipe 2 is fixedly connected with the piston 6, and the lower section of the rock core pipe 2 is connected with the penetration boot 3.
The outer tube 1 of the corer is provided with a lower limit structure for limiting the downward movement of the piston 6 and a first upper limit structure for limiting the upward movement of the pressure maintaining inner tube 5, and the first upper limit structure is positioned above the lower limit structure. The pressure maintaining inner pipe 5 can move to prop against the first upper limit structure under the action of external force and is in sealing fit with the outer pipe 1 of the corer. The piston 6 enters the pressure maintaining inner pipe 5 under the action of external force and is in sealing fit with the pressure maintaining inner pipe 5, and a second upper limit structure for limiting the upward movement of the piston 6 is arranged in the pressure maintaining inner pipe 5.
As shown in fig. 2, the flap valve 4 comprises a valve seat 41 and a pressure maintaining valve cover 42, the valve seat 41 is connected with the outer tube 1 of the corer, one side of the pressure maintaining valve cover 42 is movably connected with one side of the top of the valve seat 41, and the top of the valve seat 41 is provided with a valve seat sealing surface which is matched with the pressure maintaining valve cover 42. The valve seat 41 can be turned over by self weight, and a spring can be added to provide triggering elastic force.
In one possible design, the flap valve 4 further comprises a first spring 43, the first spring 43 being mounted on the inner wall of the outer tube 1 of the corer or in a recess in the outer surface of the pressure maintaining valve cap 42. In one possible design, one side of the pressure maintaining valve cover 42 is hinged to the top of the valve seat 41 with a torsion spring.
As shown in fig. 1, in the initial state, the lower end of the pressure maintaining inner pipe 5 is propped against the valve seat 41, the pressure maintaining inner pipe 5 limits the pressure maintaining valve cover 42 in the annular space between the outer wall of the pressure maintaining inner pipe 5 and the inner wall of the outer pipe 1 of the corer, and the pressure maintaining valve cover 42 is opened; the first spring 43 is compressed between the dwell valve cover 42 and the outer corer tube 1.
In the initial state, the piston 6 and the outer tube 1 of the corer are connected together through the pin 7; the piston 6 is located below the flap valve 4. The piston 6 and the outer tube 1 of the coring device are provided with pin holes 15 which are matched with the pins 7, and the pins 7 are radially arranged in the pin holes 15.
It should be noted that the number of pins 7 is reasonably set according to needs, and two pins 7 are preferably symmetrically set in general.
The first shoulder 11 is established to the outer tube 1 inner wall of corer and constitutes limit structure down, and the second shoulder 51 is established to the inner wall of pressurize inner tube 5 and constitutes limit structure on the second, and the first limit structure that goes up is established to the third shoulder 13 in the outer tube 1 inner wall of corer, and second shoulder 51 is located first shoulder 11 top, and third shoulder 13 is located second shoulder 51 top.
In one possible design, a second sealing ring 14 is mounted on the third shoulder 13, the second sealing ring 14 being used to achieve a seal between the pressure maintaining inner pipe 5 when the upper end moves against the third shoulder 13.
In one possible design, the outer tube 1 of the coring device has at least one flow-through hole 12 in the wall of the tube that extends through the inner and outer walls thereof, the flow-through hole 12 being located above the first shoulder 11, the flow-through hole 12 being axially spaced from the first shoulder 11 by a distance greater than the axial thickness of the piston 6.
It should be noted that the number of the overflow holes 12 is reasonably set according to needs, and at least two overflow holes 12 are preferably arranged at equal intervals in the circumferential direction in general.
In one possible design, as shown in FIG. 3, the outer tube 1 of the coring device has an upper tube section 101 and a lower tube section 102, with the lower end of the upper tube section 101 being threadably connected to the upper end of the lower tube section 102. The inner diameter of the outer pipe upper section 101 is larger than the diameter of the outer pipe lower section 102, the outer pipe lower section 102 can be in sealing fit with the piston 6, the first shoulder 11, the overflow hole 12 and the pin hole 15 are arranged on the outer pipe lower section 102, the third shoulder 13 is arranged on the outer pipe upper section 101, and the pressure maintaining inner pipe 5 is arranged in the outer pipe upper section 101.
In one possible design, as shown in fig. 4, the pressure maintaining inner pipe 5 has a first section 501, a second section 502 and a third section 503 which are integrally manufactured, the first section 501, the second section 502 and the third section 503 are sequentially connected, the diameters of the first section 501, the second section 502 and the third section 503 are sequentially reduced, a second shoulder 51 is formed at the connection part of the first section 501 and the second section 502, and the second section 502 can be in sealing fit with the piston 6 to form a sealing section of the pressure maintaining inner pipe 5.
In one possible design, as shown in fig. 5-8, the outer wall of the piston 6 has an annular groove in which is mounted a first sealing ring 61. The piston 6 is provided with a pressure measuring and pressure releasing interface which penetrates through the upper surface and the lower surface of the piston 6, and a one-way valve 8 is arranged at the pressure measuring and pressure releasing interface. Specifically, the pressure measuring and releasing interface comprises a valve cavity 62, a first pore canal 63 and a second pore canal 64, wherein the lower end of the first pore canal 63 penetrates through the lower surface of the piston 6, the upper end of the first pore canal 63 penetrates through the valve cavity 62, the upper end of the second pore canal 64 penetrates through the upper surface of the piston 6, and the lower end of the second pore canal 64 penetrates through the valve cavity 62. The check valve 8 comprises a valve core 81 and a second spring 82, the valve cavity 62 is a stepped hole, the valve core 81 is arranged in a small hole of the valve cavity 62 and is in sealing fit with the hole wall through a valve core sealing ring, and the valve core 81 and the second spring 82 are arranged in a large hole of the valve cavity 62. The valve core 81 is located above the second spring 82, and under the action of the second spring 82, the valve core 81 is mounted in a small hole of the valve cavity 62 and abuts against an inner shoulder of the pressure measuring and relieving interface.
To facilitate the installation of the non-return valve 8, two configurations of the piston 6 are provided in this embodiment. First, as shown in fig. 5 and 6, the diameter of the second hole 64 is smaller than that of the valve cavity 62, the diameter of the first hole 63 is larger than or equal to that of the valve cavity 62, a threaded head 63 with an axial through hole 66 is arranged in the second hole 64, the threaded head 63 is in threaded connection with the first hole 63, the lower end of the second spring 82 abuts against the threaded head 63, and under the action of the second spring 82, the valve core 81 abuts against a shoulder at the joint of the second hole 64 and the valve cavity 62. In particular, the check valve 8 further comprises a valve stem 83 adapted to the second duct 64, the valve stem 83 being mounted in the second duct 64, the lower end of the valve stem 83 being connected to the valve core 81. In particular, the valve stem 83 is integrally manufactured with the valve element 81.
Second, as shown in fig. 7 and 8, the diameter of the first hole 63 is smaller than that of the valve cavity 62, the diameter of the second hole 64 is larger than or equal to that of the valve cavity 62, a threaded head 63 with an axial through hole 66 is arranged in the second hole 64, the threaded head 63 is in threaded connection with the second hole 64, the lower end of the second spring 82 abuts against an inner shoulder at the joint of the first hole 63 and the valve cavity 62, and the valve core 81 abuts against the threaded head 63 under the action of the second spring 82. In particular, the check valve 8 further comprises a stem 83 adapted to the second duct 64, the stem 83 being housed in the axial through hole 66, the stem 83 being connected at its lower end to the valve core 81.
In one possible design, the penetration shoe 3 is a conical barrel with its large end secured to the lower end of the core barrel 2.
The piston 6 is provided with a connecting structure for connecting a lifting device so as to lift the piston 6 and the core barrel 2 upwards. In one possible design, the top of the piston 6 is provided with a fishing spearhead 9, and the pulling device may be a wire rope 91 and a fisher 92, which are conventional in the art and will not be described here.
The using method of the inserted pressure maintaining corer comprises the following steps:
prior to coring, a pin 7 connects the plunger 6 with the outer tube 1 of the coring device, as shown in fig. 1;
after the corer is lowered to a target coring stratum, drilling fluid is introduced, the drilling fluid has a tendency of driving a piston 6 to move downwards, then a pin 7 is sheared, after the pin 7 is sheared, the piston 6 moves downwards under the action of the drilling fluid, the core barrel 2 and the penetration boot 3 are driven to perform coring movement downwards, and the obtained core barrel enters the core barrel 2;
after the rock core completely enters the rock core pipe 2, the lower end of the piston 6 is also located on the first shoulder 11 of the outer pipe 1 of the corer, at the moment, the overflow hole 12 is opened, and the drilling fluid flows out of the outer pipe 1 of the corer through the overflow hole 12, so that the pressure is prevented from being suppressed, and the corer is prevented from being damaged, as shown in fig. 9;
after the core completely enters the core pipe 2, throwing a fisher 92 into a wellhead through a steel wire rope 91, wherein the fisher 92 is connected with a fishing spearhead 9, as shown in fig. 10;
lifting the steel wire rope 91 to drive the piston 6, the core barrel 2 and the core to move upwards, so that the core enters the pressure maintaining inner pipe 5, and the first sealing ring 41 of the piston 6 enters a sealing section of the pressure maintaining inner pipe 5 to be sealed, as shown in fig. 11;
continuously lifting the steel wire rope 91 to drive the pressure maintaining inner pipe 5 to synchronously move upwards, wherein the upper end of the pressure maintaining inner pipe 5 is seated on the third shoulder 13 of the outer pipe 1 of the corer, and the upper end of the pressure maintaining inner pipe 5 is sealed with the outer pipe 1 of the corer by means of the second sealing ring 14; at the same time, the pressure maintaining inner pipe 5 moves upwards to pass over the flap valve 4, and then provides space for the turning of the pressure maintaining valve cover 42, and under the action of the first spring 43, the pressure maintaining valve cover 42 turns over to seal with the closed lower end of the valve seat 1, so that a pressure maintaining space is formed, as shown in fig. 12;
after the corer is lifted to the ground from the bottom of the well, the pressure measurement and pressure relief interface and the one-way valve 8 arranged on the piston 6 can be used for measuring the internal pressure of the core tube 2, and the pressure is relieved through the pressure measurement and pressure relief interface before the core is taken out, so that the operation safety is ensured. The specific operation is as follows: the external load cell or the pressure relief mechanism is connected with the pressure measurement pressure relief interface, the valve core 81 is pushed downwards to compress the second spring 82, and the valve core sealing ring on the valve core 81 loses the sealing effect, so that the measurement or the unloading of the internal pressure of the core barrel 2 can be completed through the interface.
According to the pressure-maintaining pressure-relieving device, the core of a soft stratum can be obtained through pressure maintaining, the pressure measuring and relieving interface is formed on the piston, the pressure inside the core pipe can be measured through the channel, the pressure can be unloaded through the channel, the operation with pressure is prevented, and the safety can be effectively improved.
The foregoing detailed description has set forth the objectives, technical solutions and advantages of the present application in further detail, but it should be understood that the foregoing is only illustrative of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. Inserted pressurize corer suitable for soft stratum, its characterized in that: comprising the following steps:
the outer tube (1) of the corer is provided with a lower limiting structure for limiting the downward movement of the piston (6) and a first upper limiting structure for limiting the upward movement of the pressure maintaining inner tube (5), and the first upper limiting structure is positioned above the lower limiting structure;
the piston (6) is arranged in the outer tube (1) of the coring device, the piston (6) is provided with a first sealing ring (61), the piston (6) is connected with the outer tube (1) of the coring device through a pin (7), and the piston (6) is provided with a connecting structure for connecting a lifting device;
the upper end of the rock core pipe (2) is connected with the piston (6);
the penetrating shoe (3) is connected with the lower end of the rock core pipe (2);
the flap valve (4) comprises a valve seat (41) and a pressure maintaining valve cover (42), the valve seat (41) is connected with the outer tube (1) of the corer, one side of the pressure maintaining valve cover (42) is movably connected with one side of the top of the valve seat (41), and a valve seat sealing surface matched with the pressure maintaining valve cover (42) is arranged at the top of the valve seat (41);
the lower end of the pressure maintaining inner pipe (5) is propped against the valve seat (41), and the pressure maintaining valve cover (42) is limited in the annular space between the outer wall of the pressure maintaining inner pipe (5) and the inner wall of the outer pipe (1) of the corer;
the piston (6) can penetrate through the valve seat (41) under the action of external force to enter the pressure maintaining inner pipe (5) and is in sealing fit with the pressure maintaining inner pipe (5), and a second upper limit structure for limiting the upward movement of the piston (6) is arranged in the pressure maintaining inner pipe (5); the pressure maintaining inner pipe (5) can move to prop against the first upper limit structure under the action of external force and is in sealing fit with the outer pipe (1) of the corer;
when the pressure maintaining inner pipe (5) moves to a certain height in the outer pipe (1) of the corer, the pressure maintaining valve cover (42) loses restriction and falls back to the top of the valve seat (41) and is in sealing fit with the valve seat (41).
2. The insert-type pressure-maintaining corer for use in a soft formation of claim 1, wherein: the inner wall of the outer tube (1) of the coring device is provided with a first shoulder (11) to form the lower limit structure, the inner wall of the pressure maintaining inner tube (5) is provided with a second shoulder (51) to form the second upper limit structure, the inner wall of the outer tube (1) of the coring device is provided with a third shoulder (13) to form the first upper limit structure, the second shoulder (51) is located above the first shoulder (11), and the third shoulder (13) is located above the second shoulder (51).
3. The insert-type pressure-maintaining corer for use in a soft formation of claim 1, wherein: a spring is arranged between the pressure maintaining valve cover (42) and the outer tube (1) of the corer.
4. The insert-type pressure-maintaining corer for use in a soft formation of claim 2, wherein: and a second sealing ring (14) is arranged on the third shoulder (13), and when the upper end of the pressure maintaining inner pipe (5) moves to be propped against the third shoulder (13), the second sealing ring (14) realizes the sealing between the third shoulder and the third shoulder.
5. The insert-type pressure-maintaining corer for use in a soft formation as in any one of claims 1-4, wherein: at least one overflow hole (12) penetrating through the inner wall and the outer wall of the outer tube (1) of the corer is arranged on the tube wall of the outer tube (1), the overflow hole (12) is positioned above the lower limiting structure, and the axial distance between the overflow hole (12) and the lower limiting structure is greater than the axial thickness of the piston (6).
6. The insert-type pressure-maintaining corer for use in a soft formation of claim 2, wherein: the outer tube (1) of the corer is provided with an outer tube upper section (101) and an outer tube lower section (102), and the lower end of the outer tube upper section (101) is in threaded connection with the upper end of the outer tube lower section (102);
the inner diameter of the outer pipe upper section (101) is larger than the diameter of the outer pipe lower section (102), the outer pipe lower section (102) can be in sealing fit with the piston (6), the first shoulder (11), the overflow hole (12) and the pin hole (15) are arranged on the outer pipe lower section (102), the third shoulder (13) is arranged on the outer pipe upper section (101), and the pressure maintaining inner pipe (5) is arranged in the outer pipe upper section (101).
7. The insert-type pressure-maintaining corer for use in a soft formation of claim 1 or 6, wherein: the pressure maintaining inner pipe (5) is provided with a first section (501), a second section (502) and a third section (503) which are integrally manufactured, the first section (501), the second section (502) and the third section (503) are sequentially connected, the diameters of the first section (501), the second section (502) and the third section (503) are sequentially reduced, a second upper limit structure is formed at the joint of the first section (501) and the second section (502), and the second section (502) can be in sealing fit with the piston (6).
8. The insert-type pressure-maintaining corer for use in a soft formation of claim 1, wherein: the piston (6) is provided with a pressure measuring and pressure releasing interface, the pressure measuring and pressure releasing interface penetrates through the upper surface and the lower surface of the piston (6), and a one-way valve (8) is arranged at the pressure measuring and pressure releasing interface.
9. The insert-type pressure maintaining corer for use in a soft formation of claim 8, wherein: the pressure measuring and relieving interface comprises a valve cavity (62), a first pore canal (63) and a second pore canal (64), wherein the lower end of the first pore canal (63) penetrates through the lower surface of the piston (6), the upper end of the first pore canal (63) penetrates through the valve cavity (62), the upper end of the second pore canal (64) penetrates through the upper surface of the piston (6), and the lower end of the second pore canal (64) penetrates through the valve cavity (62);
the one-way valve (8) comprises a valve core (81) and a second spring (82), the valve cavity (62) is a stepped hole, the valve core (81) is matched with a small hole of the valve cavity (62), a valve core sealing ring which is used for being in sealing fit with a hole wall is arranged on the valve core (81), and the second spring (82) is arranged in a large hole of the valve cavity (62);
the valve core (81) is positioned above the second spring (82), and under the action of the second spring (82), the valve core (81) is arranged in a small hole of the valve cavity (62) and is propped against an inner shoulder of the pressure measuring and relieving interface.
10. The insert-type pressure-maintaining corer for use in a soft formation of claim 9, wherein: the piston (6) has two kinds of following:
the first, the diameter of the second pore canal (64) is smaller than the diameter of the valve cavity (62), the diameter of the first pore canal (63) is larger than or equal to the diameter of the valve cavity (62), a thread head (63) with an axial through hole (66) is arranged in the second pore canal (64), the thread head (63) is in threaded connection with the first pore canal (63), the lower end of a second spring (82) is propped against the thread head (63), and under the action of the second spring (82), a valve core (81) is propped against a shoulder at the joint of the second pore canal (64) and the valve cavity (62); the one-way valve (8) comprises a valve rod (83) matched with the second pore canal (64), the valve rod (83) is arranged in the second pore canal (64), and the lower end of the valve rod (83) is connected with the valve core (81);
secondly, the diameter of the first pore canal (63) is smaller than that of the valve cavity (62), the diameter of the second pore canal (64) is larger than or equal to that of the valve cavity (62), a threaded head (63) with an axial through hole (66) is arranged in the second pore canal (64), the threaded head (63) is in threaded connection with the second pore canal (64), the lower end of a second spring (82) is propped against an inner shoulder at the joint of the first pore canal (63) and the valve cavity (62), and under the action of the second spring (82), a valve core (81) is propped against the threaded head (63); the one-way valve (8) comprises a valve rod (83) matched with the second pore canal (64), the valve rod (83) is arranged in the axial through hole (66), and the lower end of the valve rod (83) is connected with the valve core (81).
11. A method of using the insert-type pressure-maintaining corer for use with a soft earth formation as in any one of claims 1-10, wherein: the method comprises the following steps:
after the corer is lowered to a target coring stratum, drilling fluid is introduced, the drilling fluid has a tendency of driving a piston (6) to move downwards, then a pin (7) is sheared, after the pin (7) is sheared, the piston (6) moves downwards under the action of the drilling fluid, and the core tube (2) and the penetration boot (3) are driven to perform downward coring movement, and the obtained core enters the core tube (2);
after the rock core completely enters the rock core pipe (2), the lower end of the piston (6) is also located on the lower limiting structure of the outer pipe (1) of the coring device, and when the overflow hole (12) is arranged on the outer pipe (1) of the coring device, drilling fluid flows out of the outer pipe (1) of the coring device through the overflow hole (12);
after the rock core completely enters the rock core pipe (2), connecting a piston (6) at a wellhead through a lifting device;
the piston (6) is lifted upwards through the lifting device, the piston (6), the core barrel (2), the penetrating shoe (3) and the core move upwards, so that the core enters the pressure maintaining inner pipe (5), and the piston (6) is sealed with the pressure maintaining inner pipe (5);
continuously lifting upwards to drive the pressure maintaining inner pipe (5) to synchronously move upwards, wherein the upper end of the pressure maintaining inner pipe (5) is seated on a first upper limit structure of the outer pipe (1) of the corer, the piston (6) is seated on a second upper limit structure of the pressure maintaining inner pipe (5), and the upper end of the pressure maintaining inner pipe (5) is sealed with the outer pipe (1) of the corer by means of a second sealing ring (14); meanwhile, the pressure maintaining inner pipe (5) moves upwards to cross the flap valve (4), space is provided for overturning the pressure maintaining valve cover (42), and the pressure maintaining valve cover (42) overturns to seal the lower end after closing with the valve seat (1), so that a pressure maintaining space is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210867562.0A CN115126433B (en) | 2022-07-22 | 2022-07-22 | Plug-in pressure maintaining corer suitable for soft stratum and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210867562.0A CN115126433B (en) | 2022-07-22 | 2022-07-22 | Plug-in pressure maintaining corer suitable for soft stratum and use method thereof |
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| Publication Number | Publication Date |
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| CN115126433A CN115126433A (en) | 2022-09-30 |
| CN115126433B true CN115126433B (en) | 2023-06-20 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3621924A (en) * | 1970-03-24 | 1971-11-23 | Maurice P Lebourg | Soft formation core barrel |
| CN205778652U (en) * | 2016-07-05 | 2016-12-07 | 中交第四航务工程勘察设计院有限公司 | A kind of core drill based on hydraulic pressure card coring |
| NL2019760B1 (en) * | 2017-10-18 | 2019-04-25 | Fugro Tech Bv | Piston corer and method of acquiring a soil sample. |
| CN108756796B (en) * | 2018-05-30 | 2020-03-10 | 广州海洋地质调查局 | Pressure-maintaining coring method for offshore drilling |
| CN109973035B (en) * | 2018-12-26 | 2024-04-12 | 深圳大学 | Rock sample fidelity core taking system |
| CN109826578B (en) * | 2019-03-01 | 2023-10-27 | 广州海洋地质调查局 | Safety type natural gas hydrate rotary pressure maintaining coring device |
| CN110748653B (en) * | 2019-11-26 | 2024-03-26 | 深圳大学 | Pressure-maintaining corer flap valve with multistage sealing structure |
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