Oilfield Cementing 101

Primary

Primary Cementing

Simple Explanation:

Once we are at the location, we hook our Pump Truck up to the casing ( pipe) on the rig floor and we mix a blend of cement (designed for the needs of the well), we then high pressure pump the cement down the inside of the casing. The cement will then return up the outside of the casing to create a secure foundation for the hole.  There are many uses and types of cement jobs; however, this would be an example of the type of work we do.

Detailed Explanation:Primary Cement

Primary Cementing is cement work performed during the drilling phase of the well to provide zonal isolation, casing support and protection of the pipe from corrosive fluids. This is performed by circulating a cement slurry through the inside of the casing and out into the annulus through the casing shoe at the bottom of the casing string. In order to precisely place the cement slurry at a required interval on the outside of the casing, a rubber or wooden plug is pumped with a displacement fluid behind the cement slurry column, which “bumps” in the casing shoe and prevents further flow of fluid through the shoe. This bump can be seen at surface as a pressure spike at the cement pump. To prevent the cement from flowing back into the inside of the casing, a float collar above the casing shoe acts as a check valve and prevents fluid from flowing up through the shoe from the annulus.

Remedial

Remedial CementingIWP_4040

Remedial Cementing is cement work that is performed on a well after the primary cementing work is complete. Reasons for remedial cementing may include repairing problems that may have incurred during the primary cement job, or cementing off zones and well abandonments to list a few.

 

Blends & Lab

Lab

An oilfield cementing lab is for testing new cement blends and administering quality control for existing blends. Also, the lab is where a team of experts research and develop different cement chemicals and technology to find the best quality blend.

Magnum’s cement lab is designed to conduct all the recommended API testing procedures for primary and remedial cementing.

  • Specific testing includes:Batch Mixer - Copy
  • Compressive Strengths
  • Fluid Loss
  • Rheology Tests
  • Thickening Times
  • Water Analysis

Blends

Blends are specifically formulated cement mixtures with special additives that suit the needs of the  location a company is working on. There are many different types of cement blends that are specially formulated in our laboratory.

Magnum offers the traditional blends from 2100 density kick-off to 1300 density light-weight cement, all suited for the Western Canadian Sedimentary Basin as well as our own proprietary blends and specialized additives.