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Compared with other concentric casing drilling systems, this design significantly improves cuttings evacuation efficiency and flow capacity.
During drilling operations, borehole verticality is superior to that achieved with eccentric casing systems.
Suitable for large-diameter casing advancement drilling applications.

Typical Applications

Technical Specifications

Model	O.D. of casing tube, mm	I.D. of casing tube, mm	Thickness, mm	Guide device max. diameter, mm	Reamed diameter, mm	Min. O.D. of casing shoe, mm	Quantity of blocks	DTH hammer	Weight, kg
F90	114	101	6.5	99	125	90	2	3.5''	15
F98	127	108	9.5	106	138	98	2	3.5''	18
F115	146	126	10	124	157	117	2	4''	20.5
F136	168	148	10	145	180	136	2	5''	33.5
F142	178	158	10	154	195	142	2	5''	39
F160	194	174	10	172	206	160	2	6''	48
F185	219	199	10	196	234	185	2	6''	61
F210	245	225	10	222	260	210	2	8''	88
F240	273	253	10	251	305	240	3	8''	97
F280	325	305	10	302	346	282	3	8'' or 10''	115
F305	355	335	10	332	376	305	3	12''	214
F360	406	382	12	380	432	360	3	12''	254
F412	460	436	12	434	485	412	3	14''	415
F432	480	454.6	12.7	450	505	432	3	14''	415
F454	508	482.6	12.7	479	534	454	3	18''	630
F510	560	534.6	12.7	530	590	510	3	18''	730
F551	610	584.6	12.7	582	639	551	3	18''	895
F600	660	632	14	628	684	600	3	18'' or 24''	946
F645	711	679	16	675	741	645	3	24''	1210
F694	762	730	16	726	800	694	3	24''	1595
F750	813	781	16	776	845	752	3	24''	2436
F850	914	882	16	878	966	850	4	28''	2756
F950	1016	984	16	980	1060	956	5	28''	3076
Other specifications are available upon request.

In what situations is a foot-wing casing drilling system used?

The foot-wing system is suitable for both small- and large-diameter drilling applications. With strong rock-breaking capability, it is widely used in foundation piles, micropiles, tunnels, railways, bridges, and building construction projects.

Can foot-wing casing drilling systems be used in all formations?

They are suitable for most geological formations. However, in highly complex formations with frequent cavities or in very deep oil and gas wells, a concentric casing drilling system with ring bits is recommended.

Why choose a foot-wing casing drilling system?

It offers excellent cost performance and can handle the majority of geological conditions encountered in the field. Combined with its superior cuttings evacuation capability, it can effectively increase penetration rates, making it a popular choice among operators.