CN2137710Y - Core receiver for soft cataclasite layer - Google Patents

Abstract

The utility model relates to a core receiver for soft cataclasite layers in oilfield well drilling, which overcomes the defects of easy mud drum and small shrinkage scale of other core receivers and can enhance the shrinkage scale of core catchers and prevent mud drum. The core catcher can actively hold the core pole when the core is cut, which enhances the core yield rate. The utility model is composed of an external cylinder 1, a press cap 2, a spring 3, a core clamping box 4, a lower contact of an inner cylinder 5, a clamping board 6, a clamping board base 7, a core catcher 8, a reducing sleeve 9, a lower bearing 10, a clamping spring 11 and a drill bit 12. The aims are achieved by that the wall of the work carrier type core catcher 8 of the core receiver is provided with an axial groove 13 used as a drilling fluid flow passage.

Description

Core receiver for soft cataclasite layer

The utility model relates to a kind of oil field soft broken stratum coring tool of digging a well.

At present, the oil field is in the well-digging process, get the instrument that core adopts: the core pawl is hidden between the core of the card box and the inner core, drilling fluid flows through from circuit between drill bit inwall and the core of the card outer box wall, clamping hoop type core pawl is owing to be subjected to the restriction of drilling fluid passage, core pawl wall can't be done thicklyer, then makes core pawl contraction scope less.The core post bigger to wearing and tearing especially to core post soft, frangible stratum, needs the core pawl to have bigger contraction scope just can hold, intercept core.So the contraction scope has directly influenced the core yield rate.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, makes the drilling fluid runner and provide a kind of with axial groove on the core pawl wall, makes clamping hoop type core pawl shrink bigger soft, the broken stratum coring tool of scope, can improve the core yield rate.

The purpose of this utility model can reach by the following technical programs: on the coring tool clamping hoop type core pawl wall that is made of urceolus 1, pressure cap 2, spring 3, the core of the card box 4, inner core lower contact 5, clamp 6, base of fixed plate 7, core pawl 8, undergauge cover 9, lower bearing 10, jump ring 11 and drill bit 12, the axial groove of making the drilling fluid runner is arranged.

The utility model is compared above-mentioned prior art following advantage: owing on core pawl wall the axial groove of doing the drilling fluid runner is arranged, original instrument annular flow channel space, in order to the wall thickness of increase core pawl and the length of tooth, when cutting core, can make core pawl contraction scope bigger, tooth wedging core post is darker, make the core pawl block the core post securely, improve coring recovery rate.

Fig. 1 is that the utility model partly cuts open schematic diagram;

Fig. 2 is an A-A generalized section on Fig. 1;

Fig. 3 is the state of the U.S. a kind of coring tool bottom the core of the card mechanism when cutting core, and annulus area 14 is the mud runner;

Fig. 4 be in Fig. 3 the inner card core mechanism at the state that installs before not cutting core.

To be described further the utility model below in conjunction with accompanying drawing:

Shown in Fig. 1,2, the utility model is made of urceolus 1, pressure cap 2, spring 3, the core of the card box 4, inner core lower contact 5, clamp 6, base of fixed plate 7, core pawl 8, undergauge cover 9, lower bearing 10, jump ring 11 and drill bit 12, and mainly drilling fluid runner and clamping hoop type core pawl place improve in coring tool.The axial groove 13 of doing the drilling fluid runner is being arranged between tooth and the tooth on core pawl 8 body walls, cancelling the annular channel of former instrument.And will have now in the coring tool, the annular channel bulk of doing drilling fluid is used for increasing the thickness of core pawl, has increased the contraction scope of core pawl effectively.

During installation, with clamp 64 li in the core of the card box of together packing into behind the base of fixed plate 7 of packing into, compression spring 3 is arranged at top, is threaded on the core of the card box 4 with pressure cap 2 on the spring, on the clamping hoop type core pawl 8 opening is arranged, rise and bind round in inner core lower contact 5 lower ends, seat overlaps on 9 inner conical surfaces in undergauge, and undergauge cover 9 is threaded with the core of the card box 4, and the core of the card box is takeed in drill bit 12 in by 10 of lower bearings and encircled, and drill bit is threaded on the urceolus 1, and jump ring 11 is used for fixing lower bearing 10.

When core drill advanced, drilling fluid was by between the core of the card box 4 and the inner core lower contact 5, and core enters inner core smoothly, and do not contact clamp 6 and core pawl 8, after having bored drilling depth, by the water conservancy lifting, the core of the card box 4 is extracted in inner core lower contact 5, clamp 6 and clamping hoop type core pawl 8 are discharged, embrace core.When on when carrying drill bit 12, clamping hoop type core pawl 8 overlaps further wedging of 9 inner conical surfaces and the disconnected core of card along undergauge.

Claims (1)

1, a kind of soft broken stratum of oil drilling coring tool that is applicable to, it constitutes its feature by urceolus 1, pressure cap 2, spring 3, the core of the card box 4, inner core lower contact 5, clamp 6, base of fixed plate 7, core pawl 8, undergauge cover 9, lower bearing 10, jump ring 11 and drill bit 12: on coring tool clamping hoop type core pawl 8 walls axial groove 13 of doing the drilling fluid runner is arranged.

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