FCS ®- Flexible Cement Systems_Well Cementing Services_Products & Services

FCS ^® - Flexible Cement Systems

Characteristics and Benefits

Cement is placed in the annulus between the casing and the formation to provide long term zonal isolation. However, even if the slurry was properly placed during the cementing job, and had initially fulfilled its isolation role, changes in downhole conditions can induce sufficient stresses to destroy the integrity of the cement sheet.
FCS technology is engineeringly approached to improve zonal isolation of the well by controlling and adjusting the mechanical properties of the set cement. With this approach the values of the elastic parameters and amount of expansion are specified to meet the requirement for long term mechanical durability, hence zone isolation.

Benefits

Provide cement elastic properties while maintaining the compressive strength
Superior job quality and zonal isolation performance
Applicable in geothermal, gas storage, steam injection and unconventional fracturing
Characteristics

High temperature elastomers with low Young’s Modulus
Particle engineering technology in FCS design
Low permeability
Controllable cement expansion
Characteristics

Good bonding between cement, casing and formation
Resistant to variation in thermal and mechanical stress
Durable and long-term stability

Additive	OPT Code	Color and Form
DuraCem Additive	KCM044A	White Grain
Flexible Additive	KCM024	Black Grain
Expanding Agent	KCM025HC	Pale Gray Powder
Expanding Agent	KCM025H	Pale Gray Powder

Typical Properties and Field Applications

FCS technology was commercialized in 2011 successfully and has been applied in various oil and gas fields in the world. It has been proved to be effective in cementing oil or gas wells with the following conditions and properties:

Temperature:	BHST 60-662℉ (15-350℃)
Density:	8.3 ppg to 23.3 ppg (1.00 – 2.80 g/cm³)
Mix-water:	Fresh water
Compressive strength:	20-30 MPa/200℃ for 7 days
API fluid loss:	≤50 mL
Treatment Wells:	Steam injectors, gas storage wells, geothermal wells, unconventional multi-stage fracturing wells

Further information about field jobs is described in documented “Case History of FCS Technology”.

Typical FCS properties are shown in the following Figures and Pictures.

Elasticity and Compressive Strength of Cement Prepared with FCS and Regular Slurry

Cement Integrity Prepared with Regular and FCS Slurries

Precautions and HSE Considerations

FCS systems include three major additives which are flexible additive KCM024, DuraCem additive KCM044A and expanding agent KCM025H/KCM025HC. Other additives such as fluid loss agent, retarder, dispersant are generally used for controllable rheological, fluid loss, thickening time and stability of FCS cement slurries. Laboratory tests are required to confirm the compatibility between FCS additives and other additives to be used in the slurry.

The laboratory procedures, quality assurance program and guidelines for field mixing and handling of FCS systems are described in FCS fluid manual.

Refer to the technical sheet and SDS of the respective product for the health, safety and environmental information of each product.