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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None-stop pumping sand washing service

Service introduction

By using purpose-built circulation subs, sand washing operation could be continuously without stop pump while making up joints or stands. So the risk of pipe stuck can be great reduced and sand washing service can be more effective and safer.

Application scope

Applied in string size of 2-7/8"~5" with highest pressure up to 35MPa.

Service performance

Applied more than 10 wells in China offshore oilfield, washing sand up to 300m in one trip.

Compound de-scaling service

Service introduction

By optimization different kinds of tools, i.e. Magnetic junk sub, de-scaling sleeve, de-scaling mill and rotary scraper, etc, compound de-scaling service provides a high efficiently option for cleaning up the inner-wall of casing or completion string.

Application scope

Applied in serious scaled casing of 7"~9-5/8".

Service performance

Applied over 20 wells in China offshore oilfield, with a maximum processing section up to 3100 m.

Completion string re-connecting service

Service introduction

COSL can fish out the failure completion string and re-connecting according the new completion design, which could avoid the fishing job of entire completion string and meet the requirements of production, reduce the risks and costs.

Application scope

Applied in 7"~9-5/8" casing to re-connect 5-1/2"~7" completion string.

Service performance

Applied 5 wells in China offshore oilfield with fully content of operation Standard and good seal performance.

Casing reshaping and repairing service

Service introduction

This service will be conducted by using many kinds of enlarging and shaping tools, which can reshape the micro-deformation casing, drift the borehole, and includes three kinds: hydraulic-reshaping, mechanical-reshaping, and milling-reshaping.

Application scope

Applied in 7"~9-5/8" casing in micro-deformation conditions, with a maximum deviation degree lower than 65 ˚.

Service performance

Applied over 4 wells in China offshore oilfield

Casing reinforcement service

Service introduction

Squeeze cement slurry into annulus of casing from broken point to cement the formation and casing. Casing reinforcement service has two ways to achieve, which is squeezing and circulation squeezing.

Application scope

Applied in 4-1/2"~20" casing in leakage, damage, formation channeling and other conditions, with maxmium deviation degree lower than 70 ˚.

Service performance

Applied over 10 wells in China offshore oilfield; withstand pressure up to 35MPa; block channeling in one trip up to 320 meters.

Application example

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Service introduction

By using one trip casing exit assembly, retrievable hydraulic setting whip-stock, COSL provides effective and excellent quality service with a smooth sidetrack window.

Application scope

Applied in 9-5/8" casing, with maximum dogleg lower than 15 degree per 30 meters.

Service performance

Applied more than 24 wells in China offshore oilfield.

Application example.

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Overhaul technique service

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