Cement top-up systems
A reliable back-up to primary cementing
Quickly and efficiently place cement in the annulus between the conductor pipe and the open-hole section at the point of installation to achieve offshore conductor integrity.
Ensure conductor integrity with the Claxton conductor cement top-up system. A proven and reliable back up to primary cementing, the system injects cement into the annulus between the conductor pipe and the open-hole section at predefined locations. Our conductor cement top-up system is also regularly used to overcome the issues associated with poor formation conditions.
Conductor cement top-up systems are typically required for the following seabed conditions:
- ‘Soft soil’ conditions
- Coning effects at the seabed
- Irregular formations or ‘washouts’
The system consists of a cementing line attached to the conductor which is then run together to the required depth. The line is terminated with a spreader which introduces the cement at the base of the problem area when pumping commences. Some designs include multiple cement outlets at different depths.
Overcome conductor integrity challenges with Claxton’s cement top-up unit:
Claxton’s cement top-up unit uses a series of pressure sensitive burst discs which are fitted within the cement line and arranged to blow at different pressures. Monitoring the pressure enables the operator to estimate the reach level of the primary cement job relative to the seabed. Monitoring of the pumping pressure also provides evidence of successful cementing.
Our conductor cement top-up systems can even run camera systems to provide high-quality visual verification of cementing to the mudline.
An effective solution for remedial cementing at the point of installation, after the primary cement job has been carried out – being run with the conductor itself, this system need not add significant time to the installation process.
our expert view
“The life of the well relies on several factors including providing a successful cement job between the conductor and the open hole. The point of fixity of the conductors is used in various elements of the design, so it important to achieve this target in practice to avoid compromising the integrity of the wells and negatively affecting their life.”