Single-cone rock bit

2021-12-0143Author：Jiangxi Feilong Rock Bit Manufacture Co., Ltd.

GYD series Oil with Single-cone rock bit

1、Summarize

Single-cone rock bit utilizes diamond composite inserts to increase abrasive resistance of teeth and life of bits. New hydraulic structures improve the cleaning ability of hydraulic system in washing cones and shaft bottom to optimize the flow distribution at the bottom of shaft. Bit body utilizes cutting conical-shaped inserts to provide well gauge protections and better redressing performances in ascending process.

2、Structural features

This series of bits is applicable for slim hole drilling (such as side tracking, well repairing, etc.). It utilizes two stage gauge protection of the cone and bit body, optimized teeth placement, and oil storage sleeve bearing system. The bearing surface is welded and applied abrasive-resistant materials. Two watercourses structure of main and auxiliary are used for the hydraulic system with a jet nozzle and a diver-gent nozzle. It has high drilling efficiency and reliable stability.

3、Recommended drilling parameters

Formation	Bit Type	Drilling Weight (KN/mm)	Rotary Speed (r/m)
Soft formations with low compressive strength and high drillability , such as soft marl,salt, uncon-solidated sandstorm, salt, etc.	437	0.25-0.5	160-60
Soft to medium formations with low compressive strength, such as shale , clay, sandstone, soft limestone, etc.	517	0.25-0.5	160-60
Low compressive strength, medium and soft, and relatively hard abrasive interlayer strata, such as hard shale, hard gypsum, soft limestone, sandstone, laminated dolomite, etc	537	0.25-0.5	140-60
Formation with moderate hardness with high compressive strength ,Such as hard shale, limestone, sandstone, etc	617	0.25-0.5	140-60
With hard abrasive streak,such as hard shale,anhydrite,soft lime-stone,dolomite,etc	637	0.25-0.5	140-60

Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.

4、Main Models

Bit size		Bit Type
inch	mm	Bit Type
4 1/4	104.8	GYD537、GYD617
4 5/8	117.5	GYD517、GYD537、GYD617
4 3/4	120.7	GYD517、GYD537、GYD617、GYD637
6	152.4	GYD437、GYD517、GYD537、GYD617、GYD637

It can be designed and developed according to user needs.

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