Quick Details
- Processing Time:15 days
- Port:Tianjin,Shanghai, Dalian, Guangzhou
- Supply Ability: 1000 Sets Per Month
- Brand Name:Saigao
- Place of Origin:China
- Brand Name:Saigao
Quick Information
Brand Name:Saigao
Place of Origin:China
:
Description
Saigao Cementing equipment
Cementing Equipment includes various items used
while drilling oil/gas/water wells.
Casing will be installed at various depths while
drilling. It is held in place by cement, which also provides zone isolation. Casing is run to protect the wellbore from fluids, pressures and wellbore stability problems. Down-hole
equipment such as Centralizers and Turbolizers are used to ensure obtaining satisfSaigaoory zone isolation. Float Shoes and Collars (float valves) prevent backflow after the cement has been
pumped into place.
Saigao
Centralizers, Turbolizers and Scratchers
Devices fitted with hinged collars and bow springs
help keep the casing or liner in the center of the wellbore to help ensure efficient placement of a cement sheath around the casing string. If casing strings are cemented off-center, there is
a high risk that a channel of drilling fluid or contaminated cement will be left where the casing contSaigaos the formation, creating an imperfect seal.
Turbolizers have added fins to "stir" up the drilling
fluid and cement to keep the flow turbulent in order to make sure the cement flows all the way around the casing in order to prevent channeling.
Scratchers use metal wires to scrape mud cake off
permeable zones to help obtain a solid cement column.
There are four types of centralizers: bow-spring,
rigid, semi-rigid, and mold-on. Bow-spring centralizers consist of an ease of passage way through narrow hole sections with expansion in targeted locations. Rigid centralizer re made up of
solid steel bars or cast iron, with a fixed blade height that are sized to fit specific casing or hole sizes. Semi-rigid centralizer are composed of double crested bows, providing restoring
forces that exceed standards set forth in the API specifications. Mold-on centralizers are able to be applied directly to the casing surface. Its blade length, angle and spacing can be
designed to fit specific well applications, especially for the close tolerance annulus.
Float Shoe
A rounded profile float shoe with an integral check
valve attached to the bottom of a casing string prevents reverse flow, or U-tubing, of cement slurry from the annulus into the casing or flow of wellbore fluids into the casing string as it
is run. The float shoe also guides the casing toward the center of the hole to minimize hitting rock ledges or washouts as the casing is run into the wellbore. By "floating" casing in, hook
weight is reduced. With controlled or partial fill-up as the string is run, the casing string can be floated into position, precluding the need for the rig to carry the entire weight of the
casing string. The outer portions of the float shoe are made of steel and generally match the casing size and threads, although not necessarily the casing grade. The inside (including the
external taper) is usually made of cement or thermoplastic, since this material must be drilled out if the well is to be deepened beyond the casing point.
Float
Collar
A float collar is installed near the bottom of the
casing string. Cement plugs land on it during the primary cementing operation, thus retaining inside the casing a small portion of the cement slurry that may have become contaminated as the
top plug scrapes the inside of the casing. It is similar to a float shoe; often both are used for redundancy. The internal check valves may be flapper type or spring-loaded balls.
The check-valve assembly fixed within the float
collar prevents flow back of the cement slurry when pumping is stopped. Without a float collar or float shoe, the cement slurry placed in the annulus could U-tube, or reverse flow back into
the casing. The greater density of cement slurries than the displacement mud inside the casing causes the U-tube effect.
Stage
Collar
Stage Collars provide a means for cement slurry to be
displaced higher in the annulus immediately following the primary cement job. A series of differently sized rubber plugs pumped down inside the casing open and then later close the sliding
valves.
Cementing
Plug
A rubber plug used to separate the cement slurry from
other fluids, reducing contamination and maintaining predictable slurry performance. Two types of cementing plug are typically used on a cementing operation. The bottom plug is launched ahead
of the cement slurry to minimize contamination by fluids inside the casing prior to cementing. A diaphragm in the plug body ruptures to allow the cement slurry to pass through after the plug
reaches the landing collar. The top plug has a solid body that provides positive indication of contact with the landing collar and bottom plug through an increase in pump
pressure.
Cementing
Head
Cementing Head is used for cementing the annular
space between casing and bore hole during 2nd stage of well construction cycle. The Cementing Head is employed to connect the pumps of the cementing trucks to the casing string and provides
access for insertion of the cementing plugs.
Packaging & Delivery
Packing :customed
Delivery Lead Time :7-15days
Supply Ability :1000pcs/month