1. System Characterizations
This system is designed for solve the chock-point problems of the stimulation of super deep/super high temperature wells. (1) Develop fracturing gel of high temperature tolerance based on Carboxymethyl Hydroxypropyl guar and sulfonic acid hydroxypropyl guar, with organic boron zirconium crosslinker and high efficiency temperature stabilizer; (2) Realize delayed crosslinking and reduce pumping friction though using crosslinking controller and PH controller; (3) Control fracturing fluid density and dramatically enhance the hydrostatic pressure of the fracturing fluid through adding weighting materials to satisfy the requirement of the stimulation of super deep/super high temperature formations.
|
Items |
Product Indices |
|
Base fluid apparent viscosity, mPa.s |
50~80 |
|
Crosslinking time, s |
180~600 |
|
Temperature tolerance，℃ |
≤200 |
|
Gel apparent viscosity, mPa.s |
≥50 |
|
Fracturing fluid density，g/cm3 |
1.0~1.8 |
|
Matrix permeability damage ratio, % |
≤30 |
|
Viscosity of broken gel, mPa.s |
≤5.0 |
|
Surface tension, mN/m |
≤28.0 |
|
Interface tension, mN/m |
≤2.0 |
|
Residual content, mg/L |
≤600 |
|
Emulsion breaking ratio, % |
≥95 |
|
Friction reduction ratio, % |
≥60 |
|
Compatibility |
No precipitate; no flocculation |
3. Application for Treatment
Make the fracturing based fluid according to the fracturing fluid design, and add PH controller, weighting agent, friction reducer after sufficient swelling, and then add crosslinker into the base fluid according to design to form the crosslinked fracturing gel, and then mix the fluid system with proppant in the blending unit according to pumping schedule for treatment execution.
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