CN214944127U - Three-elastic-clamping-type pressure-maintaining sampling drilling tool for closing ball valve hydrate by lifting - Google Patents

Abstract

The utility model provides a three bullet card formula are carried and are drawn and close ball valve hydrate pressurize sample drilling tool, its is including locating promotion positioning mechanism, on-line measuring mechanism and the ball valve mechanism in the tubulose spare, wherein promote positioning mechanism and constitute by the three bullet card mechanism of upper limit bullet card mechanism, power bullet card mechanism, lower limit bullet card mechanism, can realize promoting, location and transmission moment of torsion function, connect by the rock core pipe between on-line measuring mechanism and the ball valve mechanism, can form a sealed cavity. This three bullet card formula are carried and are drawn ball valve hydrate pressurize sample drilling tool of closing and bore the in-process at natural gas hydrate and bore, have realized that it is sealed to the natural gas hydrate core pressurize, for land laboratory provides the original state sample of natural gas hydrate, have simple structure, dependable performance, can realize the advantage that the core normal position was cored.

Description

Three-elastic-clamping-type pressure-maintaining sampling drilling tool for closing ball valve hydrate by lifting

[ technical field ] A method for producing a semiconductor device

The utility model belongs to natural gas hydrate technical exploration trial production field, concretely relates to three bullet card formula lifts and draws and close ball valve hydrate pressurize sample drilling tool.

[ background of the invention ]

Natural gas hydrate is formed by hydrocarbon gas molecules and water in a high-pressure low-temperature environment, can be combusted due to the fact that the natural gas hydrate looks like ice, is commonly called as combustible ice, and becomes a potential alternative energy source by the characteristics of cleanness, high energy density, large energy storage amount and the like.

The natural gas hydrate is formed in a low-temperature and high-pressure environment, and the low-temperature and high-pressure environment is also necessary to maintain the original state, and if the pressure is reduced or the temperature is increased, the natural gas hydrate is decomposed. Therefore, the original storage environment of low temperature and high pressure must be maintained during the exploration of the hydrate, which brings great challenges to the exploration and development of the natural gas hydrate.

At present, a core sample is mainly obtained by a drilling method for exploitation of natural gas hydrate, pressure maintaining is the most critical in the exploitation process, and on the premise that the strength of a drilling tool meets conditions, the guarantee of the sealing performance of the drilling tool becomes the technical problem and key point of the current research.

[ Utility model ] content

In order to solve the problem, the utility model provides a three bullet card formula are carried and are drawn and close ball valve hydrate pressurize sample drilling tool, it bores at gas hydrate and get the in-process, has realized that it is sealed to gas hydrate core pressurize, provides the original state sample of gas hydrate for land laboratory.

The utility model discloses a realize through following technical scheme, provide a three bullet card formula are carried and are drawn and close ball valve hydrate pressurize sample drilling tool, its outer tube joint, outer tube upper portion through from top to bottom threaded connection in proper order connect, reducer union, outer tube sub-unit connection, outer drill bit and middle level pipe formation tubulose spare, still include: locate promotion positioning mechanism, on-line measuring mechanism, ball valve mechanism in the tubulose piece from top to bottom in proper order, promote positioning mechanism including the last spacing bullet card mechanism that sets gradually, power bullet card mechanism, lower spacing bullet card mechanism, ball valve mechanism below is equipped with a ball valve, promote positioning mechanism and pass through the spearhead of dragging for in the spacing bullet card mechanism under the wire rope pulling along axial displacement to drive the interior rock core pipe in the on-line measuring mechanism and the valve body rebound in the ball valve, make the ball valve close, form a sealed cavity with on-line measuring mechanism.

In particular, the upper limit card ejecting mechanism comprises: end cover, port jump ring, shoulder lid in outer tube joint and the outer tube upper portion joint are coaxial locating from top to bottom in proper order, the end cover section is the hollow post of T type, shoulder lid central point puts and inserts and establish a traction journal, just form a space that is used for holding the port jump ring behind end cover and the shoulder lid one end threaded connection, the shoulder lid is kept away from the one end inner wall of end cover and is outwards extended and form a holding gap, is equipped with a bullet card spring in this holding gap.

In particular, the power card ejection mechanism comprises: bullet card body and locate bullet card retaining ring, power bullet card, the bullet card joint of the bullet card spring other end in proper order, bullet card body one end outer wall and outer tube joint inner wall threaded connection, the other end insert the outer tube upper portion and connect inside, bullet card retaining ring, power bullet card, bullet card joint all are located bullet card body inner wall, and wherein power bullet card is inlayed in the bullet card body under the restriction that bullet card retaining ring and bullet card connect, draw and form a space between axle journal and the power bullet card, and should draw the axle journal other end and pass the back through a spacer pin and fix a position in bullet card joint center, bullet card connects the one end wall connection bullet card lower clutch of keeping away from power bullet card.

In particular, the lower limit snapping mechanism comprises: towards the salvage frame of outside pipe joint side, drag for spearhead, bullet card room, tension spring, lower spacing bullet card, recovery tube, bullet card frame, in the shell card room was located the outer tube, its one end and bullet card lower clutch outer wall threaded connection, the other end and middle level union coupling, recovery tube one end was inserted and is located in the bullet card room, salvage the frame and drag for the spearhead and be connected as an organic whole, drag for the spearhead and be connected with the recovery tube through pin one, the tension spring is located and is dragged for one side that the spearhead kept away from salvage frame, lower spacing bullet card is two sets of altogether, and fix on the bullet card frame through pin two with the tension spring, the relative inner tube position of lower spacing bullet card is fixed, is in the state of opening under the effect of tension spring, inlays in recovery tube and bullet card are indoor, the bullet card frame other end passes through a pin three-connection piston rods, and this piston rod is in the same place with on-line detection mechanism is articulated.

In particular, the online detection mechanism is arranged inside the middle layer pipe and comprises: two sets of gaseous quick test connector, check ball valve, interior rock core pipe, gaseous quick test connector keeps away from the one end lateral wall of piston rod and has radially seted up the exhaust hole, check ball valve locates gaseous quick test connector and keeps away from the one end of piston rod, gaseous quick test connector one end is connected as an organic wholely, the other end and interior rock core union coupling with the piston rod, is equipped with first hollow passageway in this interior rock core pipe, and this first hollow passageway is connected to check ball valve, plays carminative effect taking the in-process of rock core, interior rock core pipe passes through middle level pipe lower part and connects and ball valve mechanism and be connected.

Particularly, a second hollow channel is arranged in the inner rock core pipe, a pressure measuring cone valve hole and an in-situ sampling hole are radially formed in the gas quick test connector, a cone valve is arranged in the pressure measuring cone valve hole, and the second hollow channel is communicated with the pressure measuring cone valve hole.

In particular, the ball valve mechanism further comprises: ware casing, interior drill bit are dragged for to two O type sealing washers, cores, the contact position of interior core pipe and ball valve is located to the O type sealing washer, the ware casing is dragged for to the core locates the ball valve and keeps away from one side of interior core pipe, interior drill bit is located the core and is dragged for the ware other end, and this interior drill bit tip stretches out in outer drill bit center.

In particular, the ball valve comprises: connect body, valve body, disk seat, working ball, gear, connect body one end and interior rock core pipe threaded connection, the other end and rock core casing threaded connection of salvaging, the working ball is located in the valve body, the both ends of working ball are located to the disk seat symmetry, the gear extends a valve rod to the working ball side, and on this valve rod was located the working ball, be equipped with the rack with gear engaged with on the middle-layer pipe lower part connects.

The utility model provides a three bullet card formula are carried and are drawn and close ball valve hydrate pressurize sample drilling tool, it bores the in-process at natural gas hydrate, has realized that it is sealed to the natural gas hydrate core pressurize, provides the original state sample of natural gas hydrate for land laboratory, and actuating mechanism is more reliable, and operating condition is more smooth, and is easy and simple to handle, but wide application in natural gas hydrate exploration and development field, have simple structure, dependable performance, can realize advantages such as core normal position coring.

[ description of the drawings ]

FIG. 1 is a cross-sectional view of a three-spring-clip type lifting closing ball valve hydrate pressure-maintaining sampling drilling tool of the present invention;

FIG. 2 is an enlarged cross-sectional view of an upper limit spring clip mechanism in a three spring clip type lifting closing ball valve hydrate pressure maintaining sampling drilling tool of the present invention;

FIG. 3 is an enlarged cross-sectional view of a lower limit snapping mechanism in a three-snapping type lifting closing ball valve hydrate pressure-maintaining sampling drilling tool of the present invention;

FIG. 4 is an enlarged cross-sectional view of an on-line detection mechanism in a three-snap type lifting closing ball valve hydrate pressure-maintaining sampling drilling tool of the present invention;

FIG. 5 is an enlarged sectional view of a ball valve mechanism of a three-snap type lifting closing ball valve hydrate pressure maintaining sampling drilling tool of the present invention;

FIG. 6 is an enlarged sectional view of a ball valve of a three-spring-clip type lifting closing ball valve hydrate pressure-maintaining sampling drilling tool of the present invention;

fig. 7 is another enlarged cross-sectional view of the ball valve in the three-spring-clip type lifting closing ball valve hydrate pressure-maintaining sampling drilling tool of the utility model.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, it should be noted that the following further detailed description of the present invention, in conjunction with the accompanying drawings, uses "upper" and "lower" and other indications and positional relationships are based on the orientation and positional relationships shown in fig. 1, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Referring to fig. 1-7, the present invention provides a three-spring-clip type lifting/closing ball valve hydrate pressure-maintaining sampling drilling tool, comprising: from top to bottom threaded connection's outer tube joint 1, outer tube upper portion connect 10, reducer union 14, outer tube 31, outer tube lower part connect 33, outer drill bit 42 and the tubulose spare that middle-layer pipe 26 formed in proper order, still include: set gradually promotion positioning mechanism A, on-line measuring mechanism B, ball valve mechanism C in the tubulose from top to bottom, promote positioning mechanism A including the upper limit bullet card mechanism D, power bullet card mechanism E, the lower limit bullet card mechanism F that set gradually, ball valve mechanism C below is equipped with a ball valve G, promote positioning mechanism A and pass through the steel wire rope pulling down in the limit bullet card mechanism F drag for spear head 16 along axial displacement to drive the interior rock core pipe 32 in the on-line measuring mechanism B and the valve body 37 in the ball valve G and upwards remove, make ball valve G close, form a sealed cavity with on-line measuring mechanism B.

In particular, the upper limit card ejecting mechanism D includes: from top to bottom in proper order coaxial locate end cover 3, port jump ring 4, the shoulder lid 5 in outer tube joint 1 and outer tube upper portion joint 10, 3 sections of end cover are the hollow post of T type, 5 central points of shoulder lid put and establish one and pull axle journal 2, just form a space that is used for holding port jump ring 4 behind end cover 3 and the 5 one end threaded connection of shoulder lid, the one end inner wall that end cover 3 was kept away from to shoulder lid 5 outwards extends and forms a clearance, is equipped with an elasticity card spring 6 in this clearance.

In particular, the power card ejecting mechanism E comprises: bullet card body 7 and locate bullet card retaining ring 8, power bullet card 9, bullet card joint 11 of the 6 other ends of bullet card spring in proper order, 1 inner wall threaded connection of outer tube joint of 7 one end outer walls of bullet card body and outer tube joint, the other end inserts inside outer tube upper portion connects 10, bullet card retaining ring 8, power bullet card 9, bullet card joint 11 all are located bullet card body 7 inner wall, and wherein power bullet card 9 inlays in bullet card body 7 under bullet card retaining ring 8 and the restriction that bullet card connects 11, it forms a space to pull between journal 2 and the power bullet card 9, and should pull the 2 other ends of journal and fix a position through a spacer pin 12 after bullet card joint 11 center passes, bullet card joint 11 keeps away from the one end outer wall connection bullet card lower clutch 13 of power bullet card 9.

In particular, the lower limit snapping mechanism F comprises: a fishing frame 15 facing the side of the outer pipe joint 1, a fishing spear 16, an elastic card chamber 18, a tension spring 19, a lower limit elastic card 20, a recovery pipe 21 and an elastic card frame 23, wherein the elastic card chamber 18 is arranged in an outer pipe 31, one end of the elastic card chamber 18 is in threaded connection with the outer wall of an elastic card lower joint 13, the other end of the elastic card chamber is connected with a middle pipe 26, one end of the recovery pipe 21 is inserted in the elastic card chamber 18, the fishing frame 15 and the fishing spear 16 are connected into a whole, the fishing spear 16 is connected with the recovery pipe 21 through a pin I17, the tension spring 19 is arranged at one side of the fishing spear 16 far away from the fishing frame 15, the lower limit elastic cards 20 are in two groups, the tension spring 19 is fixed on the elastic card frame 23 through a pin II 22, the lower limit elastic card 20 is fixed relative to the position of the inner pipe and is in an open state under the action of the tension spring 19 and is embedded in the recovery pipe 21 and the elastic card chamber 18, the other end of the elastic card frame 23 is connected with a piston rod 25 through a pin III 24, the piston rod 25 is hinged to the on-line detection mechanism B.

In particular, the online detection mechanism B is arranged inside the intermediate pipe 26 and includes: two sets of gaseous quick test connector, check ball valve 30, interior rock core pipe 32, gaseous quick test connector keeps away from the one end lateral wall of piston rod 25 and has radially seted up exhaust hole 29, check ball valve 30 locates gaseous quick test connector and keeps away from the one end of piston rod, gaseous quick test connector one end is connected as an organic wholely, the other end is connected with interior rock core pipe 32 with piston rod 25, is equipped with first hollow passageway in this interior rock core pipe 32, and this first hollow passageway is connected to check ball valve 29, plays carminative effect taking the in-process of rock core, interior rock core pipe 32 is connected with ball valve mechanism C through middle level pipe lower part joint 34.

Particularly, a second hollow channel is arranged in the inner rock core pipe 32, a pressure measuring cone valve hole 27 and an in-situ sampling hole 28 are radially formed in the gas quick test connector, a cone valve is arranged in the pressure measuring cone valve hole 27, and the second hollow channel is communicated with the pressure measuring cone valve hole 27.

In particular, the ball valve mechanism C further comprises: ware casing 41, interior drill bit 43 are fished for to two O type sealing washers 35, core, the contact position of interior core pipe 32 and ball valve G is located to O type sealing washer 35, ware casing 41 is fished for to the core is located ball valve G and is kept away from one side of interior core pipe 32, interior drill bit 43 is located the core and is fished for the ware casing 41 other end, and this interior drill bit 43 tip stretches out in outer drill bit 42 center.

In particular, said ball valve G comprises: connect body 36, valve body 37, disk seat 40, working ball 39, gear 38, connect body 36 one end and interior rock core pipe 32 threaded connection, the other end and rock core bailing ware casing 41 threaded connection, working ball 39 is located in the valve body 37, the both ends of working ball 39 are located to disk seat (40) symmetry, gear 38 extends out a valve rod to working ball 39 side, and this valve rod is located on working ball 39, be equipped with the rack with gear engaged with on the middle level pipe lower part joint 34, when interior rock core pipe 32 drives valve body 37 and moves up together, because middle level pipe lower part joint 34 is immovable, the two can produce relative displacement, and under gear rack's transmission, the valve rod can drive working ball 39 is rotatory.

The installation process comprises the following steps:

before the operation starts, the tool is assembled as shown in figure 1, the outer pipe assembly is first lowered down to the bottom of the hole by means of a drilling machine. In an initial state, the port clamp spring 4 is in an open state, the power spring clip 9 is positioned on a boss of the traction journal 2 and embedded in the spring clip body 7, the limiting pin 12 is arranged at the upper end of a slot of the traction journal 2, the fishing spearhead 16 is hooked by the fishing frame 15, the lower limiting spring clip 20 is in an open state under the action of the tension spring 19, the power spring clip penetrates through a slot of the recovery pipe 21 and is embedded in the spring clip chamber 18, and the lifting positioning mechanism A is hinged with the online detection mechanism B through the piston rod 25; the valve at the gas quick detection joint of the online detection mechanism B is in a closed state, and the exhaust hole 29 is in an open state; in the ball valve mechanism C, the working ball 39 is in an open state, the core retriever housing 41 is at the lower end of the working ball 39, and the inner core tube 32 penetrates through the working ball 39 and is externally connected with the inner drill 43.

The working process is as follows:

after the assembly is finished, clamping the shoulder cover 5 by using a clamping plate, then hoisting, slowly loosening the clamping plate after the assembly is placed at a wellhead, putting the inner pipe assembly at the bottom of a hole, and positioning the inner pipe assembly in the inner pipe under the limitation of a seat ring, wherein the inner drill bit 43 is ahead of the outer drill bit 42; then, the pump is started for drilling, the drilling machine drives the outer pipe 31 to rotate, torque is transmitted through the power elastic clamp 9, the inner pipe assembly is driven to rotate, the rock core starts to be taken at the moment, the rock core enters the inner rock core pipe 32, and the inner rock core pipe 32 cannot jump upwards in the process of taking the rock core under the action of the lower limiting elastic clamp 20; meanwhile, the gas and the circulating liquid in the inner core tube 32 can be discharged through the one-way ball valve 30 through the vent hole 29, and the sampling operation can be performed after the inner core tube 32 is filled with the core.

The sampling process was as follows: after the surface pump stops, a fisher (not shown in the figure) is lowered through a rope, the fisher hooks a spearhead on the upper part of the towing journal 2, and the inner pipe assembly is extracted through the auxiliary winch. In the process of extraction, firstly, the middle-layer pipe 26 cannot move, the traction shaft neck 2 drives the elastic clamp check ring 8 to compress the elastic clamp spring 6, and the power elastic clamp 9 retracts into the groove of the traction shaft neck 2; the spearhead 16 drives the recovery tube 21 to move, compresses the lower limit elastic clip 20 to contract and retracts into the recovery tube 21; when the position reaches the diameter-changing position at the upper end of the traction shaft neck 2, the port clamp spring 4 contracts and is clamped, the limiting pin 12 is located at the lower end of the notch of the traction shaft neck 2, the inner rock core pipe 32 is retracted into the working ball 39 to drive the valve body 37 to move upwards and generate relative displacement with the lower joint 34 of the middle-layer pipe, and the valve rod drives the ball valve G to turn 90 degrees under the transmission of the gear rack; at the moment, a sealed cavity is formed between the online detection mechanism B and the ball valve mechanism C in the drilling tool, the pressure of the core sample in the sealed cavity is kept unchanged, and the pressure is equal to the liquid column pressure of the hole bottom flushing liquid; and then continuously lifting, wherein the inner pipe assembly can smoothly pass through the elastic clamping body 7 and the elastic clamping chamber 20 without the limitation of the power elastic clamp 9 and the lower limiting elastic clamp 20 until the fisher lifts the core drilling tool except the outer pipe assembly to the ground surface, and the pressure maintaining and sampling operation is completed.

Claims (8)

1. The utility model provides a three bullet card formula are carried and are drawn and close ball valve hydrate pressurize sample drilling tool, its outer tube joint (1), outer tube upper portion joint (10), reducer union (14), outer tube (31), outer tube lower part joint (33), outer drill bit (42) and middle level pipe (26) through from top to bottom threaded connection in proper order form a tubulose piece, its characterized in that still includes: locate promotion positioning mechanism (A), on-line measuring mechanism (B), ball valve mechanism (C) in the tubulose piece from top to bottom in proper order, promote positioning mechanism (A) including the last limit bullet card mechanism (D), power bullet card mechanism (E), the lower limit bullet card mechanism (F) that set gradually, ball valve mechanism (C) below is equipped with a ball valve (G), promote positioning mechanism (A) and draw spearhead (16) along axial displacement in spacing bullet card mechanism (F) under the wire rope pulling to drive interior rock core pipe (32) in the on-line measuring mechanism (B) and valve body (37) rebound in ball valve (G), make ball valve (G) close, form a sealed cavity with on-line measuring mechanism (B).

2. A three-cartridge-type pull-off ball valve hydrate pressure-maintaining sampling drilling tool according to claim 1, wherein the upper limit cartridge-locking mechanism (D) comprises: from top to bottom in proper order coaxial locate end cover (3), port jump ring (4), shoulder lid (5) in outer tube joint (1) and outer tube upper portion joint (10), end cover (3) section is the hollow column of T type, shoulder lid (5) central point puts and inserts and establish one and pull axle journal (2), just end cover (3) and shoulder lid (5) one end threaded connection back form one and be used for holding the space of port jump ring (4), the one end inner wall that end cover (3) were kept away from in shoulder lid (5) outwards extends and forms one and hold the clearance, is equipped with one and plays card spring (6) in this hold the clearance.

3. A three-spring-clip-type pull-off ball valve hydrate pressure-maintaining sampling drilling tool according to claim 2, wherein the power spring-clip mechanism (E) comprises: a spring clip body (7), a spring clip retainer ring (8), a power spring clip (9) and a spring clip joint (11) which are arranged at the other end of the spring clip spring (6) in sequence, the outer wall of one end of the elastic clamping body (7) is connected with the inner wall of the outer pipe joint (1) by screw thread, the other end is inserted into the upper joint (10) of the outer pipe, the elastic clip retainer ring (8), the power elastic clip (9) and the elastic clip joint (11) are all positioned on the inner wall of the elastic clip body (7), wherein the power elastic clip (9) is embedded in the elastic clip body (7) under the limitation of the elastic clip retainer ring (8) and the elastic clip joint (11), a gap is formed between the traction journal (2) and the power spring clip (9), and the other end of the traction journal (2) passes through the center of the elastic clamping joint (11) and then is positioned by a limit pin (12), the outer wall of one end of the elastic clamp connector (11) far away from the power elastic clamp (9) is connected with an elastic clamp lower connector (13).

4. A three-cartridge-type pull-off ball valve hydrate pressure-maintaining sampling drilling tool according to claim 3, wherein the lower-limit cartridge mechanism (F) comprises: the fishing device comprises a fishing frame (15) facing the side of an outer pipe joint (1), a fishing spearhead (16), a snapping chamber (18), a tension spring (19), a lower limiting snapping piece (20), a recovery pipe (21) and a snapping frame (23), wherein the snapping chamber (18) is arranged in an outer pipe (31), one end of the snapping chamber is in threaded connection with the outer wall of a lower snapping piece (13), the other end of the snapping chamber is connected with a middle-layer pipe (26), one end of the recovery pipe (21) is inserted into the snapping chamber (18), the fishing frame (15) and the fishing spearhead (16) are connected into a whole, the fishing spearhead (16) is connected with the recovery pipe (21) through a first pin (17), the tension spring (19) is arranged on one side of the fishing spearhead (16) far away from the fishing frame (15), the lower limiting snapping pieces (20) are arranged in two groups, the tension spring (19) and the lower limiting snapping piece (20) are fixed on the snapping frame (23) through a second pin (22), and the lower limiting snapping piece (20) is fixed relative to the position of the inner pipe, the recovery tube is in an open state under the action of a tension spring (19) and is embedded in the recovery tube (21) and the cartridge chamber (18), the other end of the cartridge frame (23) is connected with a piston rod (25) through a pin III (24), and the piston rod (25) is hinged with the online detection mechanism (B).

5. A three-spring-clip-type pull-off ball valve hydrate pressure-maintaining sampling drilling tool as set forth in claim 4, wherein the online detection mechanism (B) is provided inside the middle-layer pipe (26), and comprises: two sets of gaseous quick test joint, check ball valve (30), interior rock core pipe (32), gaseous quick test joint keeps away from the one end lateral wall of piston rod (25) and has radially seted up exhaust hole (29), gaseous quick test joint keeps away from the one end of piston rod is located in check ball valve (30), gaseous quick test joint one end is connected as an organic whole, the other end and is connected with interior rock core pipe (32) with piston rod (25), is equipped with first hollow passageway in this interior rock core pipe (32), and this first hollow passageway is connected to check ball valve (29), plays carminative effect taking the in-process of rock core, interior rock core pipe (32) are connected with ball valve mechanism (C) through middle-layer pipe sub-unit (34).

6. The three-spring-clip-type lifting-closing ball valve hydrate pressure-maintaining sampling drilling tool according to claim 5, wherein a second hollow channel is arranged in the inner rock core tube (32), a pressure-measuring cone valve hole (27) and an in-situ sampling hole (28) are radially formed in the gas quick test connector, a cone valve is arranged in the pressure-measuring cone valve hole (27), and the second hollow channel is communicated with the pressure-measuring cone valve hole (27).

7. A three-spring-clip-type pull-off ball valve hydrate pressure-maintaining sampling drilling tool according to claim 5, wherein the ball valve mechanism (C) further comprises: ware casing (41), interior drill bit (43) are fished for to two O type sealing washer (35), cores, the contact position of interior core pipe (32) and ball valve (G) is located in O type sealing washer (35), the one side of interior core pipe (32) is kept away from in ball valve (G) is located in ware casing (41) is fished for to the cores, interior drill bit (43) are located the core and are fished for the ware casing (41) other end, and this interior drill bit (43) tip stretches out in outer drill bit (42) center.

8. A three-spring-clip-type pull-off ball valve hydrate pressure-retaining sampling drill tool according to claim 7, characterized in that the ball valve (G) comprises: connect body (36), valve body (37), disk seat (40), work ball (39), gear (38), connect body (36) one end and interior rock core pipe (32) threaded connection, the other end and rock core fish for ware casing (41) threaded connection, the work ball (39) are located in valve body (37), the both ends of work ball (39) are located to disk seat (40) symmetry, gear (38) extend out a valve rod to work ball (39) side, and this valve rod is located on work ball (39), be equipped with the rack with gear engaged with on well layer pipe lower part connects (34).

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