Non-Invasive Fluid and Lost Circulation Materials
EMC has developed proprietary Smart Fluid Technology that creates a self-sealing and binding mechanism for Non-Invasive Fluid (NIF) and Lost Circulation Materials (LCM) for more cost-effective drilling of wells with high differential pressures and challenges related to lost circulation.
This unique technology is using modified cellulose fibres with active ingredients to create an automatic physiochemical interaction in the well. These products can be used in both Oil Based and Water Based Drilling fluids for avoiding fluids losses, increase wellbore strengthening and avoiding pressure transmission. EMC’s NIF products can also be used in the reservoir section and will be easily removed by light reverse pressure without requiring acid treatment. The EMC NIF and LCM products are designed to handle large differential pressures (> 3 500 psi) and can be adapted to any drilling fluid irrespective of specific gravity.
EMC’s NIF and LCM product range:
FERBRICOAT (Fine, Medium, Coarse)
BOREMAT (Medium, Coarse)
FEBRIBRIDGE (Bridging LCM for high- to total loss situations)
AURAFIX (Non-Invasive Fluid and sweep applications)
AURACOAT (Highly soluble Reservoir drilling Non-Invasive Fluid)
AURABRIDGE (Highly soluble Reservoir drilling LCM)
Pic1: Example of seal created by FEBRICOAT in permeable sand formations.
The EMC product line is an active grade of LCM that incorporates the NIF sealing mechanism EMC has developed. The sealing mechanism is a part of EMC’s IP and is central to minimising the thickness of the “skin” as it provides a barrier to fluid transfer. The seals forms instantly and does not thicken over time as no further fluid is transferred across the compressible and flexible barrier. The seals are typically less than 1 mm thin and are resistant towards being “wiped” by the bit during a wiper trip. If, for any reason, the seal is disturbed, the presence of FEBRICOAT in the drilling fluid will enable an instant re-building of the seal.
“[…] Oil Field has one of the most complicated and challenging drilling operations in the region… This provides an ultimate environment for testing NIF and LCM materials to the extreme.”
"-Effectiveness of the EMC products helped in successful process of the drilling operation. We are looking forward to using EMC’s unique NIF and LCM products in other similar wells."
Following the very successful field trial, the BOREMAT range of LCM materials were tested at the University of Stavanger in slotted disc tests simulating surface-sealing of large fractures under exposure to high differtial pressures. The results showed a unique sealing of all fractures up to the system testing limit of 5000 psi (345 bar) without failure. The remarkable results were presented at a conference held by the Society of Petroleum Engineers, for more details please refer to the SPE paper SPE-195609-MS.
“The tested blends [...] showed excellent performance in terms of sealing a wide range of slot openings whilst withstanding very high differential pressures. It suggests that a considerable number of situations related to loss of drilling fluids can be successfully cured without reverting to cementing or similar type of operations for sealing off and strengthening the wellbore.” - from the SPE-195609-MS conclusion
Traditional Non-Invasive Fluid (NIF) and Lost Circulation Material (LCM) products mainly rely on particle size distribution (PSD) to plug loss zones in the formation. In isolation, the PSD approach often leaves a permeable block, and not an effective pressure resistant seal. If the seal is not complete, it will enable transmission of pressure, and thereby fluid transfer, and a gradual building of a thicker cake. EMC’s Smart Fluid Technology makes use of the known science behind PSD application, but achieves a superior strength and sealing using proprietary EMC modified cellulose technology.
Pic 2: FEBRICOAT forming a strong, but flexible and thin seal.
This EMC range of product has been successfully used in the Middle East in environments of 3700-4000 psi differential pressure and drilled wells that previously were impossible to drill using conventional NIF and LCM materials due to severe and uncontrolled losses. The LCM grades are specific to fracture size and intentionally designed to cover most fractures. The design brief for the LCM is to penetrate the larger fractures and develop a bridge from which the NIF components can form an impenetrable seal.
Pic 3: FEBRICOAT seal is removed by light reverse pressure and can be used in reservoir section without damaging the return permeability.
All EMC NIF and LCM materials are cellulose based, totally green, and exempt from REACH registration.
Pic 4: AURACOAT MEDIUM showing excellent sealing of Ceramic disc with 120µm pores under 500psi differential pressure, whereas the reference mud shows no invasion control.