CN115126433A - Insertion type pressure-maintaining coring device suitable for soft stratum and using method thereof - Google Patents
Insertion type pressure-maintaining coring device suitable for soft stratum and using method thereof Download PDFInfo
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- CN115126433A CN115126433A CN202210867562.0A CN202210867562A CN115126433A CN 115126433 A CN115126433 A CN 115126433A CN 202210867562 A CN202210867562 A CN 202210867562A CN 115126433 A CN115126433 A CN 115126433A
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- valve
- pressure maintaining
- piston
- pressure
- coring device
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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 coring device suitable for soft strata and a using method thereof, wherein the device comprises a coring device outer pipe, a rock core pipe, a penetration shoe, a flap valve, a pressure-maintaining inner pipe and a piston with a pressure-measuring pressure-releasing 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 tube is connected with the piston, and the injection boot is connected with the lower end of the core tube; the lower end of the pressure maintaining inner pipe is abutted against the valve seat, the pressure maintaining valve cover is limited in the annular space between the pressure maintaining inner pipe and the corer outer pipe, 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 corer outer pipe under the action of external force; and when the pressure maintaining inner pipe moves to a certain height, the flap valve is closed. The method comprises the steps that a piston is driven by hydraulic pressure to drive a rock core pipe and a penetration shoe to penetrate into a soft stratum, so that a pressure-maintaining rock core is obtained; the overflowing hole can effectively prevent the damage of a downhole tool; the pressure measuring and pressure releasing interface is convenient for pressure measurement and safe 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 insertion type pressure maintaining coring device suitable for soft strata and a using method thereof.
Background
The core is an important physical geological data for researching and knowing underground geology and mineral conditions.
A proper amount of wells must be selected in the range of oil fields, a certain number of rock cores are drilled for related oil and gas layer positions, and observation, analysis and research can understand that: the method includes the following steps that (1) times, lithology and sedimentation characteristics of stratum are obtained; the physical and chemical properties and the oil, gas and water containing conditions of the reservoir; ③ characteristics of crude oil layer and crude oil index; underground structural conditions (such as fault, joint, inclination angle and the like); qualitative and quantitative explanation basic data of various logging methods; sixthly, the movement and distribution conditions of oil, gas and water in the process of exploitation and the change of the stratum structure; the rock core can also be used for water injection or indoor experimental analysis of various recovery efficiency improving methods and measures for increasing yield and injection, and is essential basic data for estimating petroleum reserves, compiling a reasonable development scheme, and improving the water injection development effect and recovery efficiency of oil reservoirs.
Core drilling refers to a drilling method for taking and taking out a core during drilling to research underground geological conditions. Core drilling is usually rotary drilling, and a drilling machine is used to cut, grind and crush rock in various ways, so that a drill bit continuously drills towards the deep part of a rock stratum and cuts and takes out a core.
However, the hardness of the target stratum is soft or hard, and when coring is performed on medium-hard or hard strata with uniform lithology and better columnar property, a hydraulic motor is commonly used for driving a drill bit to drill forwards and then breaking a rock core. For loose and soft stratum, modes such as mechanical pressure type coring, hydraulic pressure type coring and full-closed coring are mainly adopted, the coring mode aiming at the loose and soft stratum mainly adopts the effect of ball valve pressure maintaining or pressure-maintaining-free coring, the problem of small coring diameter exists in the ball valve pressure maintaining, and the pressure-maintaining-free coring is difficult to meet the current requirement.
Disclosure of Invention
This application provides a bayonet pressurize corer for the acquirement of adaptation soft stratum pressurize core, and it utilizes hydraulic drive piston, drives the rock core pipe and penetrates the boots and penetrates soft stratum to acquire the pressurize core.
The application is realized by the following technical scheme:
bayonet pressurize corer suitable for soft stratum, including corer outer tube, core barrel, injection boots, flap valve, pressurize inner tube and piston:
the outer tube of the corer is provided with a lower limiting structure for limiting the downward movement of the piston and a first upper limiting structure for limiting the upward movement of the pressure maintaining inner tube, and the first upper limiting structure is positioned above the lower limiting structure;
the piston is arranged in the outer tube of the corer, the piston is provided with a first sealing ring, the piston and the outer tube of the corer are connected together through a pin, and the piston is provided with a connecting structure for connecting a lifting device;
the upper end of the core barrel is connected with the piston, and the injection 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 pipe of the coring device, 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 matched with the pressure maintaining valve cover;
the lower end of the pressure maintaining inner pipe is abutted against the valve seat, the pressure maintaining valve cover is limited in an annular space between the outer wall of the pressure maintaining inner pipe and the inner wall of the outer pipe of the coring device, and a spring is arranged or not arranged between the pressure maintaining valve cover and the outer pipe of the coring device; the piston can penetrate through the valve seat to enter the pressure maintaining inner pipe under the action of external force and is in sealing fit with the pressure maintaining inner pipe, and a second upper limiting structure is arranged in the pressure maintaining inner pipe and used for limiting the piston to move upwards; the pressure maintaining inner pipe can move to abut against the first upper limiting structure and is in sealing fit with the corer outer pipe under the action of external force; when the pressure maintaining inner pipe moves to a certain height in the outer pipe of the coring device, the pressure maintaining valve cover loses the limitation and falls back to the top of the valve seat and is in sealing fit with the valve seat.
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 mounted on the third shoulder, and when the upper end of the pressure maintaining inner tube moves to abut against the third shoulder, the second sealing ring is used for sealing the pressure maintaining inner tube and the third shoulder.
In particular, the tube wall of the outer tube of the coring device is provided with at least one overflowing hole penetrating through the inner wall and the outer wall of the outer tube of the coring device, the overflowing hole is positioned above the lower limit structure, and the axial distance between the overflowing hole and the lower limit structure is larger than the axial thickness of the piston.
Optionally, the outer tube of the corer has 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 internal diameter of outer tube upper segment is greater than the diameter of outer tube hypomere, and the outer tube hypomere can be with piston seal cooperation, and on the outer tube hypomere was located to first circular bead, overflow hole and cotter hole, the outer tube upper segment was located to the third circular bead, and the pressurize inner tube is located the outer tube upper segment.
Optionally, the pressure maintaining inner tube has a first section, a second section and a third section which are integrally manufactured, the first section, the second section and the third section are sequentially connected, the diameters of the first section, the second section and the third section are sequentially reduced, a second upper limiting structure is formed at the joint of the first section and the second section, and the second section can be in sealing fit 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 check valve can be selected from the existing check valves.
Particularly, the pressure measuring and relieving interface comprises a valve cavity, a first pore passage and a second pore passage, the lower end of the first pore passage penetrates through the lower surface of the piston, the upper end of the first pore passage penetrates through the valve cavity, the upper end of the second pore passage penetrates through the upper surface of the piston, and the lower end of the second pore passage penetrates through the valve cavity;
the check valve comprises a valve core and a second spring, the valve cavity is a step hole, the valve core is matched with a small hole of the valve cavity, a valve core sealing ring for sealing and matching 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 arranged above the second spring, and under the action of the second spring, the valve core is arranged in the small hole of the valve cavity and is abutted against the inner shoulder of the pressure measuring and relieving interface.
In particular, the pistons are of the following two types: the diameter of the second pore passage is smaller than that of the valve cavity, the diameter of the first pore passage is larger than or equal to that of the valve cavity, a thread head provided with an axial through hole is arranged in the second pore passage, the thread head is in threaded connection with the first pore passage, the lower end of a second spring is abutted against the thread head, and a valve core is abutted against a shoulder at the connection part of the second pore passage and the valve cavity under the action of the second spring; the check valve comprises or does not comprise a valve rod matched with the second pore channel, the valve rod is arranged in the second pore channel, and the lower end of the valve rod is connected with the valve core;
secondly, the diameter of the first hole channel is smaller than that of the valve cavity, the diameter of the second hole channel is larger than or equal to that of the valve cavity, a thread head provided with an axial through hole is installed in the second hole channel, the thread head is in threaded connection with the second hole channel, the lower end of a second spring abuts against an inner shoulder at the connection position of the first hole channel and the valve cavity, and a valve core abuts against the thread head under the action of the second spring; the check valve comprises or does not comprise a valve rod matched with the second pore passage, 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 use method of the inserted pressure-maintaining coring device suitable for soft stratum comprises the following steps:
lowering the corer to a target coring stratum, introducing drilling fluid, wherein the drilling fluid has a tendency of driving a piston to move downwards, then shearing a pin, and after the pin is sheared, the piston moves downwards under the action of the drilling fluid to drive a rock core pipe and a penetration shoe to perform downward coring movement, so that the obtained rock core enters the interior of the rock core pipe;
after the rock core completely enters the rock core tube, the lower end of the piston is also located on a lower limit structure of the outer tube of the coring device, and when an overflowing hole is formed in the outer tube of the coring device, drilling fluid flows out of the outer tube of the coring device through the overflowing hole;
after the rock core completely enters the rock core pipe, the rock core is connected with a piston at a well mouth through a lifting device;
the piston is lifted upwards through the lifting device to drive the piston, the rock core pipe, the injection shoe and the rock core to move upwards, so that the rock 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 move upwards synchronously, wherein the upper end of the pressure maintaining inner pipe is located on a first upper limiting structure of the outer pipe of the corer, the piston is located on a second upper limiting 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 a second sealing ring; meanwhile, the pressure maintaining inner pipe moves upwards to cross the flap valve, a space is provided for overturning the pressure maintaining valve cover, and the pressure maintaining valve cover overturns to be closed with the valve seat to complete sealing of the lower end, so that a pressure maintaining space is formed.
Compared with the prior art, the method has the following beneficial effects:
the method comprises the following steps that 1, a piston is driven by hydraulic pressure to drive a rock core pipe and a penetration shoe to penetrate into a soft stratum, so that a pressure-maintaining rock core is obtained; the pressure maintaining sealing of the lower end is realized by adopting a flap valve, so that the problem of small coring diameter caused by a ball valve can be solved;
2, the overflowing hole is automatically opened after the rock core enters the rock core pipe, so that the damage to a well bottom tool caused by well bottom pressure building can be effectively avoided;
3, this application is equipped with pressure measurement pressure release interface, and the pressure measurement of being convenient for and safe release can improve the security performance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic structural view of an insertion type pressure maintaining coring device in an initial state in the embodiment;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural view of the flap valve and the pressure maintaining inner tube installed in the outer tube of the coring apparatus in the embodiment;
FIG. 4 is a schematic view showing the structure of the inner tube for pressure retention in the example;
FIG. 5 is a schematic structural view of a check valve and a first piston in the embodiment;
FIG. 6 is a schematic structural view of a first piston in the embodiment;
FIG. 7 is a schematic view showing the structure of a check valve and a second piston in the embodiment;
FIG. 8 is a schematic structural view of a second piston in the embodiment;
FIG. 9 is a schematic diagram of the structure of the insertion type pressure maintaining coring device at the beginning of core acquisition in the embodiment;
FIG. 10 is a schematic diagram showing the construction of the lifting device in the embodiment in connection with the insertion type pressure maintaining coring device;
FIG. 11 is a schematic diagram showing the structure of the piston and the core barrel during the upward lifting process in the example;
FIG. 12 is a schematic view showing the construction of the embodiment in which the pressure maintaining inner tube is lifted up against the outer tube of the coring apparatus.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. The components of 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 present invention, 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, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict. It should be noted that, in this specification, each embodiment is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and portions that are the same as and similar to each other in each embodiment may be referred to.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, which are merely used for convenience of description and simplification of description, and do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description 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 and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the insertion type pressure maintaining coring device suitable for soft ground layers disclosed in the present embodiment includes a coring device outer tube 1, a core barrel 2, a penetration shoe 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 located in the outer pipe 1 of the coring device, the flap valve 4 is arranged on the outer pipe 1 of the coring device, 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 injection boot 3.
The coring device outer tube 1 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 abut against the first upper limiting structure and is in sealing fit with the coring device outer pipe 1 under the action of external force. And 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 used for limiting the piston 6 to move upwards 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 coring device, 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 matched with the pressure maintaining valve cover 42. The valve seat 41 can be turned over and closed by means of self-weight, and a spring can be additionally arranged to provide triggering elastic force.
In a 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 groove in the outer surface of the pressure-retaining valve cap 42. In one possible design, the pressure maintaining valve cover 42 is hinged to the top of the valve seat 41 at one side and a torsion spring is provided at the hinge.
As shown in fig. 1, in the initial state, the lower end of the pressure maintaining inner tube 5 abuts against the valve seat 41, the pressure maintaining inner tube 5 limits the pressure maintaining valve cover 42 in the annular space between the outer wall of the pressure maintaining inner tube 5 and the inner wall of the outer tube 1 of the corer, and the pressure maintaining valve cover 42 is opened; the first spring 43 is compressed between the pressure maintaining valve cap 42 and the corer outer tube 1.
In an initial state, the piston 6 and the outer tube 1 of the coring device are connected together through a pin 7; the piston 6 is positioned below the flap valve 4. The piston 6 and the outer tube 1 of the coring device are provided with pin holes 15 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 the pins 7 is reasonably set according to the requirement, and it is usually appropriate to symmetrically set two pins 7.
The inner wall of the outer tube 1 of the coring device is provided with a first shoulder 11 to form a lower limit structure, the inner wall of the pressure maintaining inner tube 5 is provided with a second shoulder 51 to form a 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 a first upper limit structure, the second shoulder 51 is positioned above the first shoulder 11, and the third shoulder 13 is positioned above the second shoulder 51.
In a 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 upper end of the dwell inner tube 5 and the third shoulder 13 when the latter is moved into abutment.
In one possible design, the outer tube 1 of the corer has at least one overflow opening 12 through its inner and outer walls, the overflow opening 12 being located above the first shoulder 11, the axial distance of the overflow opening 12 from the first shoulder 11 being greater than the axial thickness of the piston 6.
It should be noted that the number of the overflowing holes 12 is reasonably set according to needs, and it is usually preferable that at least two overflowing holes 12 are equally spaced in the circumferential direction.
In one possible design, as shown in FIG. 3, the outer tube 1 of the corer has an outer tube upper section 101 and an outer tube lower section 102, the lower end of the outer tube upper section 101 being threadably connected to the upper end of the outer tube lower section 102. The inner diameter of the outer tube upper section 101 is larger than the diameter of the outer tube lower section 102, the outer tube lower section 102 can be in sealing fit with the piston 6, the first shoulder 11, the overflowing hole 12 and the pin hole 15 are arranged on the outer tube lower section 102, the third shoulder 13 is arranged on the outer tube upper section 101, and the pressure maintaining inner tube 5 is located in the outer tube upper section 101.
In one possible design, as shown in fig. 4, the inner dwelling tube 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 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 to form a sealing section of the inner dwelling tube 5.
In one possible design, as shown in fig. 5-8, the piston 6 has an annular groove in its outer wall, in which a first sealing ring 61 is fitted. 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 the pressure measuring and pressure releasing interface is provided with a one-way valve 8. Specifically, the pressure measuring and pressure relieving interface comprises a valve cavity 62, a first duct 63 and a second duct 64, wherein the lower end of the first duct 63 penetrates through the lower surface of the piston 6, the upper end of the first duct 63 penetrates through the valve cavity 62, the upper end of the second duct 64 penetrates through the upper surface of the piston 6, and the lower end of the second duct 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 step 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 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 abutted against an inner shoulder of the pressure measuring and pressure relieving interface.
To facilitate the installation of the check valve 8, the piston 6 is provided in two configurations in this embodiment. First, as shown in fig. 5 and 6, the diameter of the second hole 64 is smaller than the diameter of the valve chamber 62, the diameter of the first hole 63 is larger than or equal to the diameter of the valve chamber 62, a threaded head 63 with an axial through hole 66 is installed 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 connection position of the second hole 64 and the valve chamber 62. Specifically, the check valve 8 further includes a stem 83 fitted into the second port 64, the stem 83 being received in the second port 64, and the lower end of the stem 83 being connected to the spool 81. In particular, the stem 83 is manufactured integrally with the valve element 81.
Secondly, as shown in fig. 7 and 8, the diameter of the first hole 63 is smaller than that of the valve chamber 62, the diameter of the second hole 64 is larger than or equal to that of the valve chamber 62, a thread head 63 with an axial through hole 66 is installed in the second hole 64, the thread 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 connection position of the first hole 63 and the valve chamber 62, and the valve core 81 abuts against the thread head 63 under the action of the second spring 82. Specifically, the check valve 8 further includes a stem 83 fitted to the second port 64, the stem 83 being fitted into the axial through hole 66, and the lower end of the stem 83 being connected to the spool 81.
In one possible design, the injection shoe 3 is a conical barrel with its large end fixedly attached to the lower end of the core barrel 2.
The piston 6 is provided with a connecting structure for connecting a pulling device so as to facilitate the upward pulling of the piston 6 and the core barrel 2. In one possible design, the top of the piston 6 is provided with a spearhead 9, and the pulling device is selected from a wire 91 and a fisher 92, which are conventional in the art and will not be described in detail herein.
The use method of the insertion type pressure maintaining coring device comprises the following steps:
before coring, the pin 7 connects the piston 6 with the outer tube 1 of the corer, as shown in fig. 1;
lowering the corer to a target coring stratum, introducing drilling fluid, wherein the drilling fluid has a tendency of driving the piston 6 to move downwards, then shearing the pin 7, and after the pin 7 is sheared, the piston 6 moves downwards under the action of the drilling fluid to drive the core barrel 2 and the injection shoe 3 to perform downward coring movement, and the obtained core enters the core barrel 2;
after the core completely enters the core barrel 2, the lower end of the piston 6 is also located on the first shoulder 11 of the outer tube 1 of the coring device, at this time, the overflowing hole 12 is opened, and the drilling fluid flows out of the outer tube 1 of the coring device through the overflowing hole 12, so that the pressure is prevented from being held, and the damage to the coring device is avoided, as shown in fig. 9;
after the core completely enters the core barrel 2, the core is thrown into a fisher 92 through a steel wire rope 91 at the wellhead, and the fisher 92 is connected with a fishing spear head 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 the sealing section of the pressure maintaining inner pipe 5 to be sealed, as shown in fig. 11;
continuously pulling the steel wire rope 91 to drive the pressure maintaining inner pipe 5 to move upwards synchronously, wherein the upper end of the pressure maintaining inner pipe 5 is located on a third shoulder 13 of the corer outer pipe 1, and the upper end of the pressure maintaining inner pipe 5 is sealed with the corer outer pipe 1 by virtue of a second sealing ring 14; meanwhile, the pressure maintaining inner pipe 5 moves upwards to cross the flap valve 4, so as to provide a space for the turnover of the pressure maintaining valve cover 42, and under the action of the first spring 43, the pressure maintaining valve cover 42 is turned over to be closed with the valve seat 1 to complete the sealing of the lower end, so that a pressure maintaining space is formed, as shown in fig. 12;
after the coring device is lifted to the ground from the well bottom, the pressure measurement and pressure relief interface and the one-way valve 8 which are arranged on the piston 6 can be used for measuring the internal pressure of the core tube 2, and the pressure relief is carried out 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: an external load cell or a pressure relief mechanism is connected to the pressure measurement and pressure relief interface, the valve core 81 is pushed downwards to compress the second spring 82, and a valve core sealing ring on the valve core 81 loses the sealing effect, so that the internal pressure of the core barrel 2 can be measured or relieved through the interface.
This application can pressurize and acquire the core in soft stratum, through set up pressure measurement pressure release interface on the piston, through the inside pressure size of this passageway measurable quantity core pipe to the uninstallation of pressure is accomplished to this passageway of accessible, prevents to press the area operation, can effectively improve the security.
The above embodiments are provided to explain the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An inserted pressure-maintaining coring device suitable for soft stratum, which is characterized in that: the method comprises the following steps:
the coring device comprises a coring device outer pipe (1) and a coring device inner pipe, wherein the coring device outer pipe is provided with a lower limiting structure for limiting a piston (6) to move downwards and a first upper limiting structure for limiting a pressure maintaining inner pipe (5) to move upwards, 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) and the outer tube (1) of the coring device are connected together through a pin (7), and the piston (6) is provided with a connecting structure for connecting a lifting device;
the upper end of the core barrel (2) is connected with the piston (6);
the injection boot (3) is connected with the lower end of the core barrel (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 coring device, 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 matched with the pressure maintaining valve cover (42);
the lower end of the pressure maintaining inner pipe (5) is abutted against the valve seat (41), 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 coring device, and a spring is arranged or not arranged between the pressure maintaining valve cover (42) and the outer pipe (1) of the coring device;
the piston (6) can penetrate through the valve seat (41) to enter 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 limiting structure used for limiting the piston (6) to move upwards is arranged in the pressure maintaining inner pipe (5); the pressure maintaining inner pipe (5) can move to abut against the first upper limiting structure and is in sealing fit with the coring device outer pipe (1) under the action of external force;
when the pressure maintaining inner pipe (5) moves to a certain height in the outer pipe (1) of the coring device, the pressure maintaining valve cover (42) loses the limitation and falls back to the top of the valve seat (41) and is in sealing fit with the valve seat (41).
2. The inserted pressure maintaining coring device for soft formations 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 positioned above the first shoulder (11), and the third shoulder (13) is positioned above the second shoulder (51).
3. The inserted pressure maintaining coring device for soft formations 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 abut against the third shoulder (13), the second sealing ring (14) realizes sealing between the third shoulder and the pressure maintaining inner pipe.
4. The insertion type pressure-holding coring device for soft formations according to any one of claims 1 to 3, wherein: the tube wall of the outer tube (1) of the coring device is provided with at least one overflowing hole (12) penetrating through the inner wall and the outer wall of the outer tube, the overflowing hole (12) is located above the lower limiting structure, and the axial distance between the overflowing hole (12) and the lower limiting structure is larger than the axial thickness of the piston (6).
5. The inserted pressure maintaining coring device for soft formations of claim 1, wherein: the coring device outer tube (1) 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 tube upper section (101) is larger than the diameter of the outer tube lower section (102), the outer tube lower section (102) can be in sealing fit with the piston (6), the first shoulder (11), the overflowing hole (12) and the pin hole (15) are arranged on the outer tube lower section (102), the third shoulder (13) is arranged on the outer tube upper section (101), and the pressure maintaining inner tube (5) is positioned in the outer tube upper section (101).
6. The insertion type pressure-holding coring device for soft formations according to claim 1 or 5, wherein: the pressure maintaining inner tube (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).
7. The inserted pressure maintaining coring device for soft formations of claim 1, wherein: and a pressure measuring and pressure releasing interface is arranged on the piston (6), 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.
8. The inserted pressure maintaining coring device for soft formations of claim 7, wherein: the pressure measuring and pressure relieving interface comprises a valve cavity (62), a first pore passage (63) and a second pore passage (64), the lower end of the first pore passage (63) penetrates through the lower surface of the piston (6), the upper end of the first pore passage (63) penetrates through the valve cavity (62), the upper end of the second pore passage (64) penetrates through the upper surface of the piston (6), and the lower end of the second pore passage (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 matched with a small hole of the valve cavity (62), a valve core sealing ring which is in sealing fit with the wall of the hole 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 abutted against an inner shoulder of the pressure measuring and relieving interface.
9. The inserted pressure maintaining coring device for soft formations of claim 8, wherein: the pistons (6) have the following two types:
the diameter of a second pore passage (64) is smaller than that of the valve cavity (62), the diameter of a first pore passage (63) is larger than or equal to that of the valve cavity (62), a thread head (63) provided with an axial through hole (66) is arranged in the second pore passage (64), the thread head (63) is in threaded connection with the first pore passage (63), the lower end of a second spring (82) abuts against the thread head (63), and a valve core (81) abuts against a shoulder at the connection part of the second pore passage (64) and the valve cavity (62) under the action of the second spring (82); the check valve (8) comprises or does not comprise a valve rod (83) matched with the second hole (64), the valve rod (83) is arranged in the second hole (64), and the lower end of the valve rod (83) is connected with the valve core (81);
secondly, the diameter of the first hole channel (63) is smaller than that of the valve cavity (62), the diameter of the second hole channel (64) is larger than or equal to that of the valve cavity (62), a thread head (63) provided with an axial through hole (66) is arranged in the second hole channel (64), the thread head (63) is in threaded connection with the second hole channel (64), the lower end of a second spring (82) abuts against an inner shoulder at the joint of the first hole channel (63) and the valve cavity (62), and a valve core (81) abuts against the thread head (63) under the action of the second spring (82); the check valve (8) comprises or does not comprise a valve rod (83) matched with the second hole (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).
10. The use of an inserted dwell coring apparatus for soft formations as claimed in any one of claims 1-9 wherein: the method comprises the following steps:
lowering the corer to a target coring stratum, introducing drilling fluid, wherein the drilling fluid has a tendency of driving the piston (6) to move downwards, then shearing the pin (7), after the pin (7) is sheared, the piston (6) moves downwards under the action of the drilling fluid to drive the core barrel (2) and the injection shoe (3) to perform downward coring movement, and the obtained core 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 lower limit structure of the outer pipe (1) of the coring device, and when the outer pipe (1) of the coring device is provided with the overflowing hole (12), the drilling fluid flows out of the outer pipe (1) of the coring device through the overflowing hole (12);
after the core completely enters the core barrel (2), the well mouth is connected with a piston (6) through a lifting device;
the piston (6) is lifted upwards through the lifting device, the piston (6), the core barrel (2), the injection shoe (3) and the core are driven to move upwards, 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 located on a first upper limit structure of the corer outer pipe (1), the piston (6) is located 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 corer outer pipe (1) by virtue of a second sealing ring (14); meanwhile, the pressure maintaining inner pipe (5) moves upwards to cross the flap valve (4), a space is provided for overturning the pressure maintaining valve cover (42), and the pressure maintaining valve cover (42) overturns to be closed with the valve seat (1) to complete sealing of the lower end, 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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| CN115126433A true CN115126433A (en) | 2022-09-30 |
| CN115126433B CN115126433B (en) | 2023-06-20 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1343808A (en) * | 1970-03-24 | 1974-01-16 | Lebourg M P | 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 |
| CN108756796A (en) * | 2018-05-30 | 2018-11-06 | 广州海洋地质调查局 | Drilling at the sea coring drilling with keep up pressure method |
| US20190113419A1 (en) * | 2017-10-18 | 2019-04-18 | Fugro Technology B.V. | Piston corer and method of acquiring a soil sample |
| CN109826578A (en) * | 2019-03-01 | 2019-05-31 | 广州海洋地质调查局 | The rotary coring drilling with keep up pressure device of safety type natural gas hydrate |
| CN110748653A (en) * | 2019-11-26 | 2020-02-04 | 深圳大学 | Pressure maintaining corer flap valve with multi-stage sealing structure |
| US20220170335A1 (en) * | 2018-12-26 | 2022-06-02 | Shenzhen University | Core sampling and preservation system |
-
2022
- 2022-07-22 CN CN202210867562.0A patent/CN115126433B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1343808A (en) * | 1970-03-24 | 1974-01-16 | Lebourg M P | 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 |
| US20190113419A1 (en) * | 2017-10-18 | 2019-04-18 | Fugro Technology B.V. | Piston corer and method of acquiring a soil sample |
| CN108756796A (en) * | 2018-05-30 | 2018-11-06 | 广州海洋地质调查局 | Drilling at the sea coring drilling with keep up pressure method |
| US20220170335A1 (en) * | 2018-12-26 | 2022-06-02 | Shenzhen University | Core sampling and preservation system |
| CN109826578A (en) * | 2019-03-01 | 2019-05-31 | 广州海洋地质调查局 | The rotary coring drilling with keep up pressure device of safety type natural gas hydrate |
| CN110748653A (en) * | 2019-11-26 | 2020-02-04 | 深圳大学 | Pressure maintaining corer flap valve with multi-stage sealing structure |
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| Publication number | Publication date |
|---|---|
| CN115126433B (en) | 2023-06-20 |
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