Centek Product Summary
Radical innovation at Centek in 2001 led to the development of a range of bow spring centralizers with superior downhole performance which have dramatically reduced failures and have proved that they save operators time and cost getting to TD.
Bringing the best to the business was hard, staying there is tough but being an industry leader is far more rewarding than replicating others. As sector forerunners we’ve changed perceptions, standards and quality; set benchmarks and created a new category of centralizers, constantly enhancing our reputation as global market leaders.
All Centek bow spring centralizers deliver performance in 5 key areas, optimizing:
- Flow by Area
- Pipe Rotation
Revolutionary design and innovation
Centek one-piece centralizers are robust and ultra-high-strength with no weak points but with the flexibility and restoring force to absorb both axial and radial loads. They are manufactured to gauge and provide maximum standoff, eliminating cement channeling. The patented bow spring design allows for flexibility when encountering tight spots with no compromise on performance integrity. These elements represent the most significant change in the centralizer industry in over 40 years.
Flexibility through under gauge conditions
Lack of integral centralizer strength or an intolerance to flexibility are some of the main causes of centralizer damage or stuck pipe in under-gauge well conditions. Pulling back or getting stuck in hole costs money and, with today’s rig rates, that can mean a lot of money. Worse, the well could be lost.
The Centek single piece unit dramatically enhances RIH of casing or liner strings due to its construction method and flexibility. Each centralizer is designed to compress to a near flat condition. During compression, through under-gauge conditions, the Centek bow spring centralizer is able to withstand the increased loads that will be encountered without damage or permanent deformation. Once a restriction has been negotiated it will revert back to its original nominal diameter and performance.
Benefits of downhole flexibility:
1. Enhanced RIH in localized restrictions
2. No additional bit run
3. Centralizer integrity maintained
Flow by Area
Flow by area displacement relates directly to fluid regimes, such as volumes, velocity, density and pressure, which have a significant impact on primary cementing operations. Field results repeatedly show our bow spring centralizers significantly improve annular flow by area.
Pipe rotation is of critical importance when carrying out primary cement jobs. The aim is to agitate the pipe to enhance the cement displacement efficiency, improving mud removal and therefore providing a good cement bond and long term zonal isolation. Centek bow spring centralizers have been designed to greatly aid pipe rotation. The design of the centralizer allows a well centralized pipe to rotate inside the centralizer due to its extremely low coefficient of friction, while the centralizer is held in position against the borehole wall.
Using Centek centralizers can provide:
- Enhanced rotation due to optimized centralization
- Improved well clean out
- Superior cement job and good zonal isolation
- Minimum rotational torque loses
- Minimize stall out effect
API defines standoff as ‘the smallest distance between the OD of the casing and the wellbore’. Standoff ratio is the ratio of standoff to the annular clearance for perfectly centered casing, expressed as a percentage. Standoff is a measure of pipe eccentricity. In a static condition, when casing is perfectly centered, standoff will be 100%. The degree of standoff achieved by the centralizer is a critical factor while running casing and tubing when the objective is a good cement job. Pipe centralization (standoff) has a major impact in many areas, but in cementing operations it will directly affect displacement efficiency.
Optimum displacement is an industry wide challenge for primary cementing. Factors that influence displacement efficiency of fluids are typically:
- Well geometry
- Pipe centralization
- Pipe movement
- Fluid velocity
- Fluid properties
- Fluid regimes
- Fluid volumes
- ECD constraints vs loss of circulation
All Centek centralizers offer optimum standoff capability in most well conditions due to their robust yet flexible performance providing enhanced results against all these factors. Improved standoff quickly translates into improved:
- Cementation operations
- Pipe centralization
- ECDs which may allow increased pump rates
- Well clean-out
Optimum standoff also has the result of reducing cement channeling and remedial works in addition to minimizing low points of pipe in the well.
View the Centek products range:
Centek Close Tolerance Centralizers
Centek S2 Hinged
Centek Centralizer Sub
Centek Stop Collars