CN2131968Y

CN2131968Y - Diamond bit for petroleum drilling in super-soft stratum

Info

Publication number: CN2131968Y
Application number: CN 92209847
Authority: CN
Inventors: 杨世奇; 黄学梅; 刘斌
Original assignee: MANUF OFFICE JIANGHAN PETROLEU
Current assignee: MANUF OFFICE JIANGHAN PETROLEU
Priority date: 1992-05-08
Filing date: 1992-05-08
Publication date: 1993-05-05
Anticipated expiration: 2002-05-08

Abstract

The utility model discloses a diamond bit for petroleum exploration in super-soft stratum, which adopts new style protective composite structure cutting teeth to enhance the shockproof performance of the diamond bit, and enhancing the hydraulic power structure and the efficiency of removing chip. In the groove space between the cutting teeth, the filler for improving the working environment of drill bit of the well bottom is arranged to enlarge the track of the well bottom of the cutting structure and reduce the shock of the cutting teeth by the well bottom rock. The utility model has the advantages of reasonable design, high efficiency, long service life, good performance and wide applicability.

Description

Diamond bit for petroleum drilling in super-soft stratum

The utility model patent relates to a kind of novel diamond bit that is applicable to dead-soft oil in place exploration drilling.

In dead-soft oil in place exploration drilling engineering, diamond bit commonly used carries out probing work.Diamond bit is by bit body, and cutting teeth and hydraulic structure are formed.Diamond bit is with contacting of formation rock its generation extruding and shearing rock stratum to be come fractured rock by its cutting teeth.

At present, the cutting teeth of diamond bit use has three kinds of materials: man-made polycrystalline diamond composite sheet (code name PDC), heat stability polycrystalline diamond (code name TSP) and natural diamond.PDC and TSP are the monoblock diamonds that manually forms by certain technology, these strength of materials height, and the hardness height, abrasion resistance is good.But a fatal weakness is arranged, and promptly property is crisp, and impact resistance is poor.

The main effect of the hydraulic structure of drill bit is a but cutting teeth of guided drilling liquid cooling, and the bottom-hole cleaning landwaste reduces the repetition breakage of cutting teeth to landwaste, improves the stock-removing efficiency of drill bit.

Its present employed hydraulic structure mainly is made up of nozzle and hydrophthalmia, and its defective is only to have considered shaft bottom chip removal and cleaning, can both effectively protect cutting structure.

Buddha's warrior attendant head drill bit is weighed the size of the contact surface of bit cutting tooth and bottom rock usually with cutting structure shaft bottom footprint in drilling process, when homogeneous formation was worked, bit cutting structure shaft bottom footprint I made the more wedging of bit cutting tooth rock stratum.To accelerate broken rock.But in the dead-soft stratum.There is the movable stone of melting to exist, and because the formed recess space in space between drill bit adjacent cutting tooth.When the bit cutting tooth was worked, in the cutting teeth front, the stone of melting that reaches below in the recess space all might produce slip and flip-flop movement and cutting teeth is produced impact.Thereby the bit cutting tooth is suffered damage, influence bit life, cause waste.

The purpose of this utility model is that a kind of novel diamond bit will be provided, and it can be suitable for the work of dead-soft strata drilling, has both had existing drill bit intensity height, the hardness height, and the characteristics that the wear-resisting heart is good possess impact-resistant ability and certain control rock ability again.

The task of the utility model patent is achieved through the following technical solutions: the utility model patent is to adopt novel protection type composite construction cutting teeth, optimizes the nozzle position and the angle of slope of drill bit hydraulic structure.Fill in the recess space between cutting teeth that measure such as filler realizes.The utility model is reasonable in design, and resistance to impact is strong, and the control lithology can be good, and the stock-removing efficiency height has than extensive applicability.

Further specify concrete structure of the present utility model below in conjunction with accompanying drawing:

Accompanying drawing 1) is the utility model concrete structure figure.

Accompanying drawing 2)-5) be the concrete structure figure of the utility model protection type composite construction cutting teeth.

Accompanying drawing 6) is the concrete structure figure of the utility model filler.

Accompanying drawing 3) is the utility model hydraulic structure figure.

Accompanying drawing number of the present utility model is:

1). diamond bit 2). bit body 3). protection type composite construction cutting teeth 4). filler 5). hydraulic structure 6). topping 7). cutwork layer 8). bottom 9). recess space 10). center line of bit 11). nozzle center line 12). nozzle angle of inclination γ 13). cutting face 14). angle α 15). nozzle jet angle β 16). hydrophthalmia 17). nozzle

The utility model diamond bit 1) by bit body 2), protection type composite construction cutting teeth 3), filler 4) and, hydraulic structure 5) form.

Protection type composite construction cutting teeth 3) successively by topping 6), cutwork layer 7), bottom 8) form, can be made into as accompanying drawing 2)-accompanying drawing 5) shown in shape.

Cutwork layer 7) forms its hardness height by the TSP tooth.Topping 6) by carbide, diadust and alloying element are formed, and hardness is taken second place, bottom 8) form by carbide and trace element, hardness is more taken second place, protection type composite construction cutting teeth 3) make by moulding sintering process.

Filler 4) usefulness is heated melting fill to send out the soft metal is sticked recess space 9).

Hydraulic structure 5) by hydrophthalmia 16) and nozzle 17) form be contained in bit body 2) on, its center line of bit 10) and nozzle center line 11) angle nozzle angle of slope γ 12) by cutting face 12) and center line of bit 10) between angle α 14) and nozzle jet angle β 15) decision, in (α-1/2 β) to (α-0.05 β) scope.Angle α 14) with nozzle jet angle β 15) be the design diamond bit 1) and the selection nozzle 17) time fixed.

Claims

1, a kind of diamond bit that is used for dead-soft oil in place exploration drilling is characterized in that by protection type composite construction cutting teeth, and filler and the nozzle angle of slope hydraulic structure between (α-1/2 β) to (α-0.05 β) that is full of recess space is formed.

2, diamond bit according to claim 1 is characterized in that described protection type composite construction cutting teeth is made up of topping, working lining, bottom.