Overhaul technique service

COSL obtained techniques of fishing, wellbore cleanup, repairment and reinforcement of casing, and casing exit after development of more than 30 years; occupied a leading position in offshore workover market of China; complete logistic team and technique team, including 15 experts having more than 20 years of experiences.

Fishing and jam-releasing service
Wellbore cleanup service
Casing repair and reinforcement services
Casing exit service

Integrated fishing service

Service introduction

Well-established integrated fishing service provide series of compound techniques of high controllability, low safety risk and high efficiency, via optimization and reassemble of wash-over, washing, cutting and fishing tools and strings.

Application scope

Applied in 5-1/2 "~ 9-5/8" casing

Cutting and fishing 5-1/2"~ 7" blank pipe and screen; Cutting and fishing 2-7/8"~ 5-1/2" tubing; washover and fishing 2-7/8"~4" tubing.

Service performance

Serviced more than 240 wells in China offshore oilfield.

Application example

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High efficiency jarring service

Service introduction

Target on different well conditions and equipments, provide high efficiency jarring service which is safer, more effective and excellent quality via multiple plans for jarring and jam-releasing.

Application scope

Name	Well condition	Applied equipment	Casing applied in
Full-hydraulic drilling jar	Medium and small size directional wells	High load equipment	4"~13-3/8"
Mechanical drilling jar	Medium and small size directional wells	High load equipment	7"~20"
High-frequency hydraulic drilling jar	Horizontal wells	Coiled-tubing, low load equipment	4-1/2"~20"
Hydraulic thruster	Horizontal wells	Coiled-tubing, low load equipment	5-1/2"~9-5/8"

Service performance

Serviced over 100 wells in China offshore oilfield.

Unconventional debris fishing service

Service introduction

For ESP fault falling, power cable, cable shield and other small pieces falling, series of special tools have been adopted, and milling and fishing conducted all together. Thus unconventional debris fishing service could be achieved in a very short time.

Application scope

Applied in casing of size 7"~9-5/8" to fishing all kinds of ESPs, strings, cables and small debris.

Service performance

Applied over 20 wells in China offshore oilfield.

Application example.

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Off-center fishing service

Service introduction

Normal fishing tool couldn’t deal the off-center fish because of hard to engage. COSL provide off-center fishing service by using special manufactured off-center centralizer to carry out reengage and fishing job.

Application scope

In casing size of 7"~9-5/8": on the condition of fish lie on the low side of horizontal section in horizontal wells or high-angle wells or other fish which have off-center engage part.

Application example

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Overhaul technique service

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