Extended reach laterals and highly deviated wells

Low TVD, highly curved and short radius wells where not enough push weight is available in vertical sections

Casing intervals separation for staged pressure testing while run in hole (several systems are installed)

General Description

AIRLOCK system helps operators to run casing or liner to target depth in long horizontal, highly deviated or ERD type wells from very first attempt without need for extensive wiper trips and time-consuming reaming operations. The Airlock system has simple, robust and failure free design. Airlock system is normally installed in between casing or liner pipes in the well interval where vertical trajectory starts changing to horizontal. Airlock tool has unique design with built-in ceramic barrier which allows fluid to be placed above the tool and air to be trapped inside casing or liner below the tool.

Features & Benefits

Unique solution to ensure TD of liner (casing) in highly deviated, long horizontal sections or ERD type wells

The trapped air increases buoyancy of casing below the Airlock tool and hence reducing the frictional forces along the horizontal section of the wellbore, resulting in less weight needed to deliver casing to final depth

Once casing reaches the target depth, the ceramic barrier shatters to fine pieces by applying hydraulic pressure from surface and flow path created for the cement job, establishing the standard ID of casing pipe

The Airlock system has junk catcher device which is normally installed on top of casing guide shoe and below the cementing plug landing collar

Weight of fluid placed above the Airlock tool provides additional push force to deliver casing or liner to target depth

Airlock system can be used in other applications such as separating intervals for casing pressure tests when running long strings to save time on potential pull out operations

Specification

Casing size, inch	4,5	5	5,5	7
Maximum OD, inch	5,59	5,91	7,09	7,87
Minimum drift diameter, inch	3,92	4,15	4,767	6,18
Overall length, inch	27,65	27,65	26,39	29,13
Weight, lb/ft	11,6-15,1	18	17-23	29,6
Operating internal pressure, psi	10,000	15,000	10,000	10,000
Operating external pressure, psi	10,000	15,000	10,000	10,000
Differential pressure of activation, psi	4,000-8,000	4,000-8,000	2,500-7,500	2,500-7,500
Operating temperature, F	370	370	370	370
Tensile strength	equal to the casing	equal to the casing	equal to the casing	equal to the casing
Steel grade	AISI 4140, P110	AISI 4140, P110	AISI 4140, P110	AISI 4140, P110
Sealing elements	HNBR/Viton	HNBR/Viton	HNBR/Viton	HNBR/Viton
Specifications Sludge trap
Maximum OD, inch	5	5,748	6,142	7,953
Minimum drift diameter, inch	3,921	4,173	4,776	6,276
Length, ft	1,312	1,804	1,804	1,804
Burst & Collapse Rating, psi	10,000	15,000	10,000	10,000

Casing size, mm	114,3	127	139,7	177,8
Maximum OD, mm	142	150	180	200
Minimum drift diameter, mm	99,6	105,41	121,08	157,8
Overall length, mm	702,31	702,31	670,40	740
Weight, kg/m	17,26-22,32	26,78	25,30-34,23	44
Operating internal pressure, MPa	69	103	69	69
Operating external pressure, MPa	69	103	69	69
Differential pressure of activation, MPa	28-55	28-55	17-52	17-52
Operating temperature, C	170	170	170	170
Tensile strength	equal to the casing	equal to the casing	equal to the casing	equal to the casing
Steel grade	AISI 4140, P110	AISI 4140, P110	AISI 4140, P110	AISI 4140, P110
Sealing elements	HNBR/Viton	HNBR/Viton	HNBR/Viton	HNBR/Viton
Specifications Sludge trap
Maximum OD, mm	127	146	156	202
Minimum drift diameter, mm	99,6	106	121,3	159,2
Length, mm	400	550	550	550
Burst & Collapse Rating, MPa	69	103	69	69

AirLock Flotation Tool