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Non-rotating wellbore casing scraper


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KWCS Model Casing Scraper
 
 
1. Overview
KWCS casing scraper is an internal tool used for removing the obstructions or foreign material from inside the walls of casing, such as residual cement, clay lump, and the burr, scales coming from casing rolling, the perforating charge which is set on the wall during sand preventing perforating inside, as well as rust, scale, hard paraffin on the production casings.
 
Structure of Scraper Part
KWCS Scraper is made up of mandrel, centering sleeve, upper support seat, hoop scraper, semi-annular plate, lower support seat, fixing sleeve, lower scraper, wearing ring, adjusting ring, spline body, gland nut, lower joint as well as other components. The hoop scraper and lower scraper can be stretched out and drew back to removing the dirt layer-by-layer according to the thickness of obstructions on the inner wall of casing; Meantime, the scraper and mandrel can mutually rotate. Mandrel and spline body are connected by spline pair connection, it can achieve the torque transmission, transfer the upper torque to the lower tools.


COMBO Type Casing Scraper
COMBO type casing scraper and GGQM/QC are used in
conjunction, the annular scraper and the lower scraper can be
internal and external expansion automatically according to the
thickness of the casing wall dirt, to scrape dirt layer-by-layer. At
the same time between scraper and spindle to turn to each
other. The mandrel and the outer tube by using spline
connection, can realize the torque transmission.

KWXZ casing scraper is one of auxiliary tools in well
completion, testing and downhole working, It is
mainly used for cleaning cement, sand, residual
bullets, rag, and otherobjects on casing inner
surface, in order to keep casing inner surface
cleaning and the drilling tools working normally. KW
XZ casing scraper can't be used in drilling
operation.
It is one kind of new type casing scraper, not
only as general fixed casing scraper, but also used
as a rotating type structure casing scraper. If as a
fixed casing scraper, as long as increase adjustable pad locates in upper sub
to make it non-rotate, otherwise decrease adjustable pad. It will be used as a
rotating casing scraper.


KWXZ casing scraper is one of auxiliary tools in well
completion, testing and downhole working, It is
mainly used for cleaning cement, sand, residual
bullets, rag, and otherobjects on casing inner
surface, in order to keep casing inner surface
cleaning and the drilling tools working normally. KW
XZ casing scraper can't be used in drilling
operation.
It is one kind of new type casing scraper, not
only as general fixed casing scraper, but also used
as a rotating type structure casing scraper. If as a
fixed casing scraper, as long as increase adjustable pad locates in upper sub
to make it non-rotate, otherwise decrease adjustable pad. It will be used as a
rotating casing scraper.

HC Hydraulic Scraper
The new HC is composed of centralizers, device and sleeve
combination switch in series, with a drill pipe connection at both
ends of the thread. It workshop in conjunction with the drilling,
grinding, milling, through wells and other working tools, so that
a downhole tool to complete a variety of different jobs, reduce
the number of the drill string from the next, greatly improve
operational efficiency and reduce mining casts. After drilling,
milling, grinding, through wells job is completed by pitching
from wellhead pressure, the scraper blade play. Hydraulic
scraper device can work the same as a conventional scraper
device. And loop holes connected to scrape beneath the sleeve
wall switch is also open at this time can carried out reverse
circulation flushing.
HC – Hydraulic scraper
The new hydraulic scraper has the following characteristics: in
drilling, milling, grinding and other operations, scraper device of
the blade is limited in the body’s groove, in the role of the upper
centralizer, stretched out less scraper not to scratch on the
inner wall of the casing, thus will not affect to normal operation
of other tools.

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