CN2100479U - Closed coring tool - Google Patents

Abstract

The utility model discloses a closed coring tool for drilling well and coring, and the sealing piston is fixed on an anti-thrust sealing ring between a claw sheathed joint and a core claw by a pin. A drill bit is not required to be dismounted after each decoring of the tool, the coring can be carried out again, the operation is simple, the time of occupation of well mouth is little, the damages of cutting teeth of the drill bit caused by dismounting coring bit for a plurality of times can be avoided.

Description

Closed coring tool

The utility model relates to a kind of drilling extracting core sealed coring instrument.

The sealed coring instrument is to carry out the coring tool a kind of commonly used that rock is got core in drilling process.This coring tool has reasonable effect for improving core quality and core yield rate.The sealed coring instrument generally is made up of main parts size such as inner core, urceolus, core pawl cover, core pawl, coring bit, packed-pistons.In the prior art, packed-piston by dowel fixes on coring bit, there is following shortcoming in this structure: 1) be fixed on the drill bit owing to packed-piston, before boring under each knockout finishes again, must just can re-assembly and the fixing seal piston by first den bohrkopf abbauen, this method operating procedure is many, and it is long to take uphole time; 2) in the process of dismounting drill bit repeatedly, be easy to damage the bit cutting tooth, reduce the application life of drill bit, increase drilling cost.

The purpose of this utility model is to design a kind of easy and simple to handle, and can guarantee the sealed coring instrument of core quality and core yield rate.

The utility model mainly is made up of interior outer rock core tube.The inner core combination is made up of core pawl (17), pawl bell and spigot joint (10), inner core (8), tap (2).The urceolus combination is made up of urceolus (9), urceolus pipe nipple (7) and top connection (1).Connect tap (2) under the top connection, the urceolus lower end connects coring bit (18), packed-piston (being made up of piston body (12) and piston head (19)) is fixed on the joint ring (15) of core pawl (17) upper end by pin (14), between core pawl cover (11) and pawl bell and spigot joint (10), sealing plug (6) is sealed on the tap (2) thrust ring (15) by pressure holding.When core drill advanced, packed-piston head (19) at first contacted the shaft bottom, because the effect of the pressure of the drill, the fixing pin of packed-piston (14) is cut off, the shaft bottom of drill bit contact afterwards, and packed-piston enters inner core fully.At this moment, the sealing fluid in the inner core begins to be extruded, and forms the urban conservation area in the shaft bottom.Along with drill bit creeps into, core constantly forms and increases, and it is constantly up to promote packed-piston.Because the inner core upper end seals; so the just inevitable core of being gone into tube of the sealing fluid in the tube pushes; and can only make corresponding equal-volume from the interior annular space of instrument discharges; the sealing fluid of discharging spreads upon core post surface immediately and forms diaphragm; simultaneously; around the core post of shaft bottom, form the urban conservation area of certain limit, thereby reach the purpose that the protection core exempts from mud contamination.During knockout, urceolus is sitting in well head, dismantles the screw thread between top connection (1) and the urceolus short circuit (7), propose inner core, dismantle the knockout of core pawl cover.Knockout finishes, and cleans core pawl, core pawl cover, packed-piston, thrust joint ring, with pin packed-piston and thrust ring joint ring is fixed.Check whether core pawl, core pawl cover " O " RunddichtringO be intact.Then core pawl cover, core pawl, packed-piston, thrust joint ring are installed, be connected on the pawl bell and spigot joint, insert urceolus and tighten, can irritate under the sealing fluid and bore.

Advantage of the present utility model is: 1, this instrument adopts packed-piston to be fixed on the structure that seals on the thrust ring, is convenient to re-assemblying of instrument after each knockout, and easy and simple to handle, it is short to take uphole time; 2, owing to do not need den bohrkopf abbauen during each knockout, thus can avoid the bit cutting tooth non-ly creep into damage, help improving bit life; 3, piston body of the present utility model to the not influence of core pawl, has overcome the shortcoming that piston body pushes up bad core pawl on the core pawl, helps guaranteeing the core yield rate.

Accompanying drawing is a sealed coring tool construction schematic diagram.Comprising: top connection (1), tap (2), packing ring (3), bolt (4), " O " RunddichtringO (4), plug (6), urceolus short circuit (7), inner core (8), urceolus (9), pawl bell and spigot joint (10), core pawl cover (11), piston body (12), " O " RunddichtringO (13), pin (14), sealing thrust ring (15), " O " RunddichtringO (16), core pawl (17), coring bit (18), piston head (19).Wherein piston body (12) and piston head (19) are formed the packed-piston of instrument, and piston body (12) is fixed on the sealing thrust ring (15) by pin (14), sealing thrust ring (15) by pressure holding between pawl bell and spigot joint (17) and core pawl cover (11).Creep into when getting core, the packed-piston that piston body (12) and piston head (19) are formed is positioned at the upper end of core pawl (17).Between piston body (12) and the piston head (19) by thread connection.

Claims (3)

1, a kind of drilling extracting core sealed coring instrument, mainly by inner core, urceolus, core pawl cover, core pawl, packed-piston, core drill is first-class forms, and it is characterized in that packed-piston is fixed on the thrust joint ring (15) between pawl bell and spigot joint (10) and the core pawl cover (11) by pin (14).

2, packed-piston according to claim 1 is characterized in that packed-piston is made up of cock body (12) and piston head (19), uses thread connection between the two.

3, packed-piston according to claim 1 is characterized in that creeping into when getting core, and packed-piston is positioned at the upper end of core pawl (17).

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