What is oilfield cementing?

What is oilfield cementing?

Part of the process of preparing a well for further drilling, production or abandonment, cementing a well is the procedure of developing and pumping cement into place in a wellbore. Most commonly, cementing is used to permanently shut off water penetration into the well.

What are the main equipments used in well cementing?

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.

What are the function of cementing?

The objective of primary cementing is to provide zonal isolation. Cementing is the process of mixing a slurry of cement, cement additives and water and pumping it down through casing to critical points in the annulus around the casing or in the open hole below the casing string.

Which cement is used in oil wells?

Oil-well cements are used for cementing work in the drilling of oil wells where they are subject to high temperatures and pressures. They usually consist of portland or pozzolanic cement (see below) with special organic retarders to prevent the cement from setting too quickly.

Why squeeze cementing is used?

The forcing, by pressure, of cement slurry into a specified location in a well, such as channels or perforations, for the purpose of achieving zonal isolation. Squeeze cementing is a remedial cementing technique used to repair flaws in primary cement or damage incurred by corrosive fluids.

What is primary cementing?

Primary cementing in oil and gas operations involves the process of mixing and displacing a cement slurry down the casing and into the annular space between the casing and wellbore.

What is class A cement?

Class A concrete shall be used for concrete structures, either reinforced or non-reinforced, and for concrete pavements. Class B concrete may be used for curbs, gutters and sidewalks. Class C concrete may be used for thrust blocks, encasements, fill or Page 2 SECTION 725 725-2 over-excavation, etc.

Is cement a mortar?

Mortar is a mixture of cement and sand (plus water).

What kind of Cementing Equipment does goes use?

GOES GmbH – Cementing Equipment The GOES Cementing units (single or twin pumping unit) are having an automatic or manually controlled re-circulation cement slurry mixing system. Truck, trailer and skid-mounted designs are in place and various customer specified tank sizes are possible.

What kind of Cementing Equipment does Halliburton use?

The Halliburton Cementing Skid Systems offer cementing and well-control pump performance for consistent, high-quality cement slurries by mixing the correct proportions of dry material and fluids. Halliburton remains the only service provider to design and manufacture fit-for-purpose pumping and mixing equipment for both land and offshore.

Where is the float collar on Cementing Equipment?

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.

What does the UEM twin cement pump do?

The UEM Twin Cement pump has been designed and built as an automatic or manually controlled recirculation cement slurry mixing system. In addition, the option to have the unit skid or chassis mounted is available. The cement unit comes with a cement displacement tank with two compartments, which are specific to each customer’s preferred size.