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Cementing Oil Wells

Posted by on in Blog

When you think of cement applications, road and building construction may be the first things that come to mind but did you know that cement is also an important element in Oil and Gas Well construction?

Once a suitable oil well site has been found, the necessary paperwork has been completed and the land has been prepared, the oil well crew will begin initial drilling and will bring in the equipment for setting up the oil rig system.

The crew begins the oil drilling process by drilling a surface hole where they think the oil trap is located. Once the crew has drilled to a pre-set depth, casing must be placed into the hole to prevent it from collapsing. Casing is a large steel pipe which lines the hole and supports the walls of the well.

Sealing with Cement

b2ap3_thumbnail_cement-casing.jpgCement is pumped down the casing pipe, using a bottom plug, cement slurry, a top plug and drill mud. The pressure from drill mud moves the cement slurry through the casing, filling the space between outside the casing and the hole. The cement is given time to harden and is tested for hardness, alignment and a proper seal.

Cementing is used for a number of different reasons. It primarily protects and seals the wellbore, preventing water penetration into the well and immobilising the casing. Cementing can also be used to seal areas where there is a reduction of flow within a well, and can extend to plugging a well for abandonment.

Specially designed oil well cement is required for oil and gas well construction as it is subject to high temperatures and pressures. Oil well cement is also known as Class G Cement and has an excellent retarder response which translates to a higher economic benefit in the mix design.

A Class of its Own

We offer Class G cement which has been used by leading global servicing providers for:

  • Sealing oil, gas and water; preventing formation fluid flow from mutual channeling and protecting productive strata
  • Sealing serious leakage zone or other complex stratus such as collapse
  • Supporting sleeve and prevent underground fluid from corroding the casing

Our Class G cement is Certified American Petroleum Institute (API)/10A API monogram since 1996. We provide consistency of quality which is critical to the Oil and Gas well construction, as variance in characteristics between deliveries can cause fluctuations in cost and preparation of slurry.

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