CN201330561Y

CN201330561Y - Coring bit with back reaming function

Info

Publication number: CN201330561Y
Application number: CNU2009200788550U
Authority: CN
Inventors: 冯明; 付晓平; 陈晓彬; 董斌; 陈立; 邓元洲; 黄建新
Original assignee: Drilling Technology Research Institute of CNPC Chuanqing Drilling Engineering Co Ltd
Current assignee: Drilling Technology Research Institute of CNPC Chuanqing Drilling Engineering Co Ltd
Priority date: 2009-01-22
Filing date: 2009-01-22
Publication date: 2009-10-21
Anticipated expiration: 2019-01-22

Abstract

a coring bit back reaming function, relating to the petroleum gas rock core drilling equipment manufacturing field, comprises a steel body and a carcass which is arranged at the front end of the steel body; an inner cutting face and an inner conical surface are arranged on the inner circle of the carcass; a front cutting face is arranged at the front end of the carcass; a front conical surface, an outer gage surface and a back taper surface are arranged on the outer circle of the carcass. The utility model solves the problems of difficult unfreezing when the collapse is serious or the well wall has a large shrinkage; the utility model employs the back reaming mode, designs a back-reaming coring bit with back taper teeth capable of reaming upwards, can perform long-distance back reaming when the coring operation is blocked, cut off the blocking rocks and remove drill-sticking accidents.

Description

The core bit of band back reaming function

Technical field:

A kind of core bit with the back reaming function is used for the rock core that petroleum gas implements in the drilling operation process and drills through, and relates to the equipment that the petroleum gas rock core drills through and makes the field.

Background technology:

In order to obtain the oily information of downhole in reservoir, in oil or Natural Gas Drilling Operation process, generally all to implement coring operation, in the oil drilling coring operation, the core bit that prior art adopts is in conjunction with coring tool, be connected with drill collar and drilling rod on the top of coring tool, in the coring operation process, finish crushing operation by core bit to bit body below formation rock, after core-drilling finishes with regard to core breaking, promote drilling tool, trip out drilling tool earthward, in the process that pulls out of hole, under the normal condition, can directly ground be proposed the rock core that obtains, but, in running into well, collapse or will reducing during borehole wall undergauge owing to borehole diameter, core bit can not be upwards by causing bit freezing, in this case, prior art is owing to only creep into the hard material of coring at the top of core bit welding-on, therefore, and during lock of tool drilling in handling coring operation, usually can only adopt, the mode of movable drilling tool is come unfreezing down, but collapsing serious or the borehole wall shrinks and just is difficult to unfreezing when big, causing and to finish coring operation smoothly, and may produce down-hole accident.

Summary of the invention:

The purpose of this utility model is the defective at prior art, adopts the mode of back reaming, has designed a kind of core bit of band back reaming function of the reaming that can make progress.

The utility model is existing by following way: a kind of core bit with the back reaming function, comprise steel body and carcass, it is characterized in that: described carcass is arranged on the front end of rigid body, interior circle at carcass is provided with interior cutting face, inner conical surface, front end at carcass is provided with preceding cutting face, is provided with inner cone, outer gage surface and inverted cone surface at the cylindrical of carcass;

Interior circle, front end and the cylindrical of described carcass fuse;

In described carcass the circle interior cutting face, inner conical surface, the preceding cutting face of carcass front end and carcass cylindrical inner cone, outer gage surface and inverted cone surface on all be inlaid with the diamond cutting tooth;

When implementing coring operation, finish the coring operation of creeping into jointly by the diamond cutting tooth that is embedded on interior cutting face, inner conical surface, preceding cutting face, inner cone and the outer gage surface to the down-hole, when finishing coring operation and upwards pulling out of hole, if meet card, the diamond cutting tooth that is arranged on inverted cone surface can cut the rock of bit freezing under the drive of ground drill, realize oppositely creeping into, reach the purpose of removing lock of tool drilling;

The beneficial effect of utility model is, because the carcass of core bit is provided with inverted cone surface, also is inlaid with the diamond cutting tooth on inverted cone surface, so in coring operation, meet the reverse reaming that to implement longer distance when blocking, the rock of excision bit freezing reaches the purpose of removing lock of tool drilling.

Description of drawings:

Fig. 1 is a half of sectional structure schematic diagram of the present utility model.

The specific embodiment:

Provide embodiment of the present utility model below in conjunction with accompanying drawing: the utility model comprises steel body 2 and carcass 3, carcass 3 is arranged on the front end of rigid body 2, in the rear end of rigid body 2 are joints 1, cutting face 5 in the interior circle of carcass 3 is provided with, inner conical surface 6, front end at carcass 3 is provided with preceding cutting face 7, cylindrical at carcass 3 is provided with inner cone 8, outer gage surface 9 and inverted cone surface 10, the interior cutting face 5 of circle in described carcass 3, inner conical surface 6, the preceding cutting face 7 of carcass 3 front ends, with carcass 3 cylindricals inner cone 8, be inlaid with diamond cutting tooth 4 on the outer gage surface 9, for the reaming that makes progress, also be inlaid with the diamond cutting tooth on inverted cone surface 10, steel body 2 and joint 1 are by screwed connection; When implementing coring operation, by drilling tool the utility model is connected G.I.H, start rig, under the drive of drilling tool, the utility model is under the suspending weight pressure of drilling tool, because interior circle, front end and the cylindrical of carcass fuse, so when creeping under the suspending weight pressure of the utility model at drilling tool, just can finish the coring operation of creeping into jointly downwards to the down-hole by the diamond cutting tooth 4 on cutting face 5, inner conical surface 6, preceding cutting face 7, inner cone 8 and the outer gage surface 9 in being embedded in; When finishing coring operation and upwards pulling out of hole, if meet card, the diamond cutting tooth that is arranged on inverted cone surface 10 can realize that oppositely cutting is crept into, and can cut the rock of bit freezing under the drive of ground drill, reaches the purpose of removing lock of tool drilling.

Claims

1. core bit with the back reaming function, comprise steel body and carcass, it is characterized in that: described carcass is arranged on the front end of rigid body, interior circle at carcass is provided with interior cutting face, inner conical surface, front end at carcass is provided with preceding cutting face, is provided with inner cone, outer gage surface and inverted cone surface at the cylindrical of carcass.

2. the core bit of band back reaming function according to claim 1 is characterized in that: interior circle, front end and the cylindrical of described carcass fuse.

3. the core bit of band back reaming function according to claim 1, it is characterized in that: interior cutting face, the inner conical surface of circle in described carcass, the preceding cutting face of carcass front end and carcass cylindrical inner cone, outer gage surface and inverted cone surface on all be inlaid with the diamond cutting tooth.