CN2856386Y - High strength coring tool - Google Patents

Abstract

The utility model relates to a high strength coring tool used in geological exploration, coal bed, construction drilling exploration and oil well drilling. The tool is composed of a top connection 1, a bearing 2, a bearing mandril 3, a safe connection 4, a pin 5, a friction ring 6, a uniflow ball 7, an outer tube top centralizer 8, an outer tube 9, an outer tube bottom centralizer 10, a coring bit 11, an inner adjusting nut 12, 14, a limit ring 13, an inner top connection 15, an inner tube 16, and inner bottom connection 17, a core catcher body 18 and a core catcher 19. The coring tool achieves design rationality and working reliability, is capable of preventing drilling core barrel from bending, preventing blocking and improving single tube footage by applying thick wall outer tube assembly, reduces core advancing resistance by 70 percent by adopting glass reinforced plastic inner tube which helps to improve core recovery and single tube coring footage.

Description

A kind of high strength coring tool

Technical field:

The utility model relates to a kind of coring tool that is used for geological prospecting, coal seam, construction project probing and oil drilling, belongs to the drilling tool class.

Background technology:

Coring is the pith of oil drilling and various exploration, drilling project.At present, on-the-spot conventional coring tool commonly used uses common seamless steel pipe or oil well casing to make the coring tool urceolus, and this urceolus easily produces transverse bending at drill bit with rotating because tube wall is thinner in creeping under the centrifugal action that produces.Under the effect of crooked urceolus, teeter will take place in core bit, and might impel inner core to bend.Under the effect of this kind bending and teeter, bit cutting part is damaged in advance, and a burst fracture and broken or disperse when rock core is advanced tin, thereby caused into a rock core to wear and tear, stop up and influence yield rate.

Summary of the invention:

Thereby being to provide a kind of, the purpose of this utility model can satisfy the high strength coring tool that also can reduce the stifled heart significantly and grind heart probability raising core recovery coring than all kinds of stratum such as broken ground, medium ground and hard formations.

The utility model is to realize like this.This kind coring tool is a double-barrel structure, comprises hanging assembly, rotation assembly, safe assembly, outer barrel assembly, inner core assembly five parts.Wherein, hang assembly and be made up of bearing mandrel, single current ball and ball seat, its effect is to hang coring tool swivel bearing, inner core and annex, in creeping into circulation fluid is diverted to crack runner between the inner/outer tube by the center; The rotation assembly is made up of bearing, bearing pressure cap, locating snap ring, and its effect is the inner core assembly not to be rotated synchronously with urceolus keep static relatively, is beneficial to protect rock core; Safe assembly is made up of top connection, safety joint, urceolus joint, pin, friction ring, and its effect is to open from here when coring tool is blocked in the down-hole, hangs the above drilling tool of assembly, inner core and coring tool so that trip out; Outer barrel assembly is made up of centralizer, urceolus, following centralizer and core bit on the urceolus, works to hang inner core assembly and assembly, transmission the pressure of the drill and moment of torsion; The inner core assembly by the upper and lower joint of inner core, regulate nut, inner core, rock core corpus unguis and core grabber and form, its effect is to obtain and hold rock core.During coring operation, in the drill string bottom, along with creeping into of its lower end core bit, the rock core of drilling strata can be taken in the inner core by core grabber with this coring tool tipping.

The utility model is reasonable in design, reliable operation, owing to adopted the heavy wall outer barrel assembly, core barrel transverse bending in can preventing to creep into, prevent the stifled heart and can improve the monotubular drilling depth, owing to adopted the glass fiber reinforced plastic inner core, thereby rock core advances a resistance and can reduce 70%, helps improving core recovery and monotubular coring footage.That this coring tool is applicable to is soft, in, the coring operation on hard all kinds of stratum.

Description of drawings:

Accompanying drawing is a general structure schematic diagram of the present utility model.

The specific embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

As shown in the figure, the utility model is by top connection 1, bearing 2, bearing mandrel 3, safety joint 4, pin 5, friction ring 6, single current ball 7, centralizer 8 on the urceolus, urceolus 9, centralizer 10 under the urceolus, core bit 11, inner core is regulated nut 12,14, locating snap ring 13, inner core top connection 15, inner core 16, inner core lower contact 17, rock core corpus unguis 18 and core grabber 19 are formed, its structure, assembled relation is as follows: on the urceolus 9, the lower end is respectively with centralizer 10 under centralizer 8 and the urceolus on the urceolus that has been threaded, centralizer 8 upper ends are by negative side's safety joint 4 that has been threaded on the urceolus, be provided with friction ring 6 and pin 5 therebetween, safety joint 4 upper ends are connected with top connection 1, and centralizer 10 lower end screw thread tippings have core bit 11 under the urceolus; Bearing mandrel 3 is housed in the safety joint 4, and bearing mandrel 3 upper outside are equipped with bearing 2, and the ball seat on the mandrel 3 bottom inner headed faces is provided with single current ball 7; Be provided with inner core 16 in the cavity that urceolus 9, last centralizer 8, following centralizer 10 constitute, inner core 16 upper ends are connected with inner core top connection 15 with screw thread, inner core top connection 15 upper ends are regulated joint 14 with screw thread and inner core and are connected, joint 14 upper ends link to each other with mandrel 3 lower ends, also are set with inner core on the mandrel of its top and regulate joint 12 and locating snap ring 13; Inner core 16 lower ends are connected with rock core corpus unguis 18 by inner core lower contact 17, and the tipping of rock core corpus unguis 18 lower ends has core grabber 19.Wherein, bearing mandrel 3 is a hollow cylinder shaft body, and its top periphery is provided with the round platform that bearing 2 is set, and the middle part is provided with 6 oblique open cycle holes, and the bottom endoporus is provided with the ball seat of single current ball 7, and periphery is provided with to be regulated nut 12,14 with inner core and be connected and use external screw thread.Safety joint 4 upper ends are provided with the internal thread that is connected with top connection 1, and the lower end is provided with the negative side's screw thread that is connected with urceolus top connection 8, and its inner headed face top is provided with the round platform that holds bearing 2, and the middle part periphery is provided with the pin hole that friction ring 6, pin 5 are set.Centralizer 8 external diameters are up-small and down-big on the urceolus, and its upper end is provided with to be connected with safety joint 4 to use square thread, lower end to be provided with to be connected with urceolus 9 uses trapezoidal thread.Urceolus 9 is the thick cyclinder body, and upper and lower side is trapezoidal thread.Centralizer 10 top peripheries are provided with helicla flute under the urceolus, and upper and lower end is provided with trapezoidal thread.Drill bit 11 lumen orifice are provided with can be for ring-type " U " the shape groove of drilling fluid circulation, and bottom land is evenly equipped with circular hole.Inner core 16 adopts glass fiber reinforced plastic to make, and also can adopt common steel to make.

Claims (1)

1, a kind of high strength coring tool, by top connection (1), bearing (2), bearing mandrel (3), safety joint (4), pin (5), friction ring (6), single current ball (7), centralizer on the urceolus (8), urceolus (9), centralizer under the urceolus (10), core bit (11), inner core is regulated nut (12), (14), locating snap ring (13), inner core top connection (15), inner core (16), inner core lower contact (17), rock core corpus unguis (18) and core grabber (19) are formed, it is characterized in that: on the urceolus (9), the lower end is respectively with centralizer (10) under centralizer (8) and the urceolus on the urceolus that has been threaded, centralizer on the urceolus (8) upper end is by negative side's safety joint (4) that has been threaded, be provided with friction ring (6) and pin (5) therebetween, safety joint (4) upper end is connected with top connection (1), and screw thread tipping in centralizer under the urceolus (10) lower end has core bit (11); Bearing mandrel (3) is housed in the safety joint (4), and bearing mandrel (3) upper outside is equipped with bearing (2), and the ball seat on the inner headed face of mandrel (3) bottom is provided with single current ball (7); Be provided with inner core (16) in the cavity that urceolus (9), last centralizer (8), following centralizer (10) constitute, inner core (16) upper end is connected with inner core top connection (15) with screw thread, inner core top connection (15) upper end is regulated joint (14) with screw thread and inner core and is connected, joint (14) upper end links to each other with mandrel (3) lower end, also is set with inner core on the mandrel of its top and regulates joint (12) and locating snap ring (13); Inner core (16) lower end is connected with rock core corpus unguis (18) by inner core lower contact (17), and the tipping of rock core corpus unguis (18) lower end has core grabber (19).

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