FRACSEAL® An inexpensive product to: Improve Production Reduce Drilling Time
WELLBORE INSTABILITY The presence of microfractures is now recognized as a common cause of severe wellbore instability, particularly in ultra-low permeability rocks such as shales and some limestones.
To establish an effective flow barrier that stop or minimise fluid invasion into microfractures • An additive must be present in the mud system at all times so that microfractures are contacted immediately the drill bit exposes to them. • They will not be effective if used as a pill treatment to stabilize a formation that has already begin to fail.
Interbedded Shale and Carbonate Shale High Porosity Carbonate
Pore Characteristics of API Filter Paper andHigh Porosity Formation Unconsolidated Sand Carbonate API Filter Paper Sand Stone Microscopic Image 100 Mag.
FRACSEAL® Developed Based on 20/40 Gravelpack Sand Porosity Unconsolidated Sand Carbonate 20/40 Gravelpack Sand Sand Stone Microscopic Image 100 Mag.
Unconsolidated Sand Formation Affected by Drilling Mud WITH Flow barrier Without flow barrier Minimum Drilling Mud Infiltration Drilling Mud Infiltration Drilling Mud with FRACSEAL Drilling Mud Unconsolidated Sand Formation Unconsolidated Sand Formation FRACSEAL Filter cake
Drilling Mud Without Effective Flow Barrier ( Permeable Filtercake ) Permeable Filtercake 20/40 Gravelpack Sand
Drilling Mud With Effective Flow Barrier ( Fracseal ) Fracseal Filtercake 20/40 Gravelpack Sand
Filtercake Comparison Test Fracseal Mica and Nutplug Tough and Impermeable Filtercake Soft and Permeable Filtercake No Penetration of Fine Solid Penetration of Fine Solid 20/40 Gravelpack Sand 20/40 Gravelpack Sand
FRACSEAL Filtercake at Ambient Temperature Solid Particles Trap by Fracseal CSIRO Perth
FRACSEAL Filtercake After 24 Hours Hot Rolling at 350 F Trapped Fine Solids by FRACSEAL Fitercake CSIRO Perth
Pore Characteristics of Common LCM WALLNUT Medium MICA Medium GRAPHITE Medium MARBLE Medium Microscopic Image 100 Mag.
Temperature Resistance Test of FRACSEAL For 24 Hours at 350O F Before After Microscopic Image 40 Mag. Microscopic Image 40 Mag. Microscopic Image 400 Mag. Microscopic Image 400 Mag. CSIRO Perth
Return Permeability to Oil as a function of differential pressureDynamic Circulation Method
Return Permeability Curve Dynamic Circulation Method Source: CORELAB
100psi Pressure TestOil Base Mud Oil Base Mud + Fracseal Oil Base Mud
Benefits of FRACSEAL® • Increased production • Better hole stability • Unconsolidated Sand • Shales • Coal • Gumbo • Reduced torque and drag • Reduced potential for differential sticking • Reduced seepage loss • Reduced whole mud loss