CN2503194Y

CN2503194Y - Diamond core drill for stratigraphic drilling

Info

Publication number: CN2503194Y
Application number: CN 01240180
Authority: CN
Inventors: 张建平; 孙红; 斯捷克良诺夫·巴利斯
Original assignee: Kingdream PLC
Current assignee: Sinopec Oilfield Equipment Corp
Priority date: 2001-05-29
Filing date: 2001-05-29
Publication date: 2002-07-31
Anticipated expiration: 2011-05-29

Abstract

The utility model relates to a diamond coring drill bit applied to formation drilling. The diamond coring drill bit comprises a drill bit body, the front part of which is provided with an eccentric rotary sleeve whose central axis deviates from that of the drill bit body; the front end of the eccentric rotary sleeve is provided with a circular diamond cutting crown part, the front end of which has a circular recess that divides the cutting crown part into an outer cutting ring and an inner cutting ring and communicates with a coring through-hole via a water inlet flow tract. The utility model has stable kinetic properties and guarantees the quality of obtained rock cores in high-efficiency bottom-hole rock breakage and further improves the performance of the coring drill bit.

Description

A kind of diamond coring bit that is used for strata drilling

The utility model relates to a kind of strata drilling diamond coring bit, applicable to the rock coring operation of oil gas well and other purposes well.

Existing diamond coring bit is made of bit body and the diamond cutting bizet that is arranged at the bit body front end, and the middle part of drill bit offers the larger-diameter through hole of coring, and the cutting bizet offers many chip removal grooves radially, is used for the discharge of landwaste and drilling fluid.Drill bit adopts the mode of rotary drilling when underground work, drill bit is around the axis rotation of drilling rod or well, because in fact the axis of drill bit does not overlap with the axis of drilling rod (well), there is certain off-centre, in this case, the one, the wearing and tearing at core bit cutting position are irregular, and efficiency of breaking rock is lower, and service behaviour is not ideal enough; The 2nd, dynamic performance was stable inadequately when core bit was worked in the shaft bottom, easily caused the damage to rock core when coring.

The purpose of this utility model is that providing a kind of at the deficiency of above-mentioned prior art existence has stable dynamic performance to obtain the diamond coring bit that is used for strata drilling of works fine efficient.

The purpose of this utility model is achieved through the following technical solutions: include bit body 1 and the annular diamond cutting bizet that is arranged on the bit body front end, the through hole 9 of coring that connects before and after offering in the bit body, its difference is to be provided with in the bit body front portion capacity eccentric bearing position of its axis and the phase deviation of bit body axis, outside the capacity eccentric bearing position, be set with an eccentric pivoted housing 5, the front end of eccentric pivoted housing is provided with annular diamond cutting bizet, the front end of annular diamond cutting bizet offers annular groove 12, make annular diamond cutting crown moieties be slit into outer cutting ring 11 and interior cutting ring 6, annular groove is connected with the through hole of coring by water inlet flow channel 8.

Press such scheme, annular groove is conducted by the periphery of draining runner 10 with eccentric pivoted housing.

The rear end of bit body was connected with drilling rod when the utility model used, because the effect of eccentric pivoted housing makes the axis of diamond cutting bizet and the axis of drilling rod have an eccentricity value ε, like this, when core bit is worked in drilling well, its diamond cutting bizet is around drilling rod center and the center of rotation of self rotation, not only revolved round the sun but also rotation, and formed the antithesis rotation status, getting out diameter is the well of coring that diamond cutting bizet diameter adds 2 ε.Under this rotary cutting state, because offering of cutting bizet annular groove, not only make the cutting bizet have a plurality of cutting faces and participate in cutting, and High-Pressure Water can pass through the direct impinging earth strata of annular groove, the stock-removing efficiency of core bit and rock breaking capacity are effectively improved; Because the rotation effect of cutting bizet can make the switching of its cutwork face equilibrium, help to cut the uniform wear at position, thereby improve its abrasion resistance simultaneously; At the antithesis rotation status, drill bit has stable dynamic performance when coring, and can make core bit guarantee the quality of institute's coring under the situation of the broken rock in high efficiency shaft bottom, and the various aspects of performance of core bit is further improved.

Fig. 1 is the positive view of an embodiment of the utility model.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing, has a bit body 1, the through hole 9 of coring that connects before and after being provided with in the bit body, the bit body rear portion is provided with taper thread, the capacity eccentric bearing position of its axis and bit body axis skew ε is set in the front portion of bit body, outside the capacity eccentric bearing position, be set with an eccentric pivoted housing 5, eccentric pivoted housing holds 4 by the Cylinder lock with ball mandrel and axially locks, the rear end of eccentric pivoted housing also is provided with ball thrust bearing 3 and joins with bit body, the front end of eccentric pivoted housing is provided with annular diamond cutting bizet, the front end of annular diamond cutting bizet offers annular groove 12, make annular diamond cutting crown moieties be slit into outer cutting ring 11 and interior cutting ring 6, usually, the width d of annular groove should be no more than 2 times eccentric throw ε, be d≤2 ε, in, the width e of outer cutting ring ₁, e ₂Can equate, also can be unequal, the width e of interior cutting ring ₁Or the width e of outer cutting ring ₂All be not more than 2 times of eccentric throw ε, i.e. e ₁≤ 2 ε, e ₂≤ 2 ε, the circumferential of diamond cutting bizet is annular, end face is plane or other various curved surfaces, in cutting bizet annular groove, have water inlet flow channel 8, water inlet flow channel passes eccentric pivoted housing and is conducted with the inlet opening 2 that is located in the bit body, and the inlet opening then is connected with the through hole 9 of coring, in addition, annular groove penetrates eccentric pivoted housing by draining runner 10 and the bit body periphery is conducted, and is used for the discharge of drilling fluid and landwaste.

Claims

1, a kind of diamond coring bit that is used for strata drilling, it includes bit body (1) and is arranged on the annular diamond cutting bizet of bit body front end, the through hole of coring that connects before and after offering in the bit body, it is characterized in that being provided with the capacity eccentric bearing position of its axis and the phase deviation of bit body axis in the bit body front portion, outside the capacity eccentric bearing position, be set with an eccentric pivoted housing (5), the front end of eccentric pivoted housing is provided with annular diamond cutting bizet, the front end of annular diamond cutting bizet offers annular groove (12), make the diamond cutting crown moieties be slit into outer cutting ring (11) and interior cutting ring (6), annular groove is connected with the through hole of coring by water inlet flow channel (8).

2,, it is characterized in that annular groove is conducted by the periphery of draining runner (8) with eccentric pivoted housing by the described diamond coring bit that is used for strata drilling of claim 1.

3, by claim 1 or the 2 described diamond coring bits that are used for strata drilling, it is characterized in that eccentric pivoted housing holds (4) by the Cylinder lock with ball mandrel and axially locks, the rear end of eccentric pivoted housing also is provided with ball thrust bearing (3) and joins with bit body.

4, by claim 1 or the 2 described diamond coring bits that are used for strata drilling, it is characterized in that the width d of annular groove should be no more than 2 times eccentric throw ε, i.e. d≤2 ε.

5, by the described diamond coring bit that is used for strata drilling of claim 4, the width e of cutting ring in it is characterized in that, or the width e of outer cutting ring ₂All be not more than 2 times of eccentric throw ε.

6, by claim 1 or the 2 described diamond coring bits that are used for strata drilling, what it is characterized in that the diamond cutting bizet is annular circumferentially, and end face is plane or other various curved surfaces.