SqueezeFrac

Summary:

SqueezeFrac is a product and process that creates wide, highly-conductive fractures near the wellbore. A SqueezeFrac job requires 80% less water, proppant, and horsepower than a conventional hydraulic fracturing treatment resulting in significant cost savings for the oil / gas operator.

Product benefits:

  • Uses 80% less water, proppant, and horsepower compared to traditional hydraulic fracturing
  • Creates wide, highly-conductive fractures resulting from a high viscosity fluid system at time of fracture creation
  • Degradable polymer fluid breaks completely and leaves no formation residue
  • In carbonate reservoirs, dual effect of fracturing and acidizing is possible
  • Completely biodegradable fluid is environmentally-friendly and safe

Product photo (degradable polymer and proppant particles):

Polymer_Sand_Pastilles2

SqueezeFrac process requires 4 steps:

  1. Small, solid particles of degradable polymer and proppant are pumped into the wellbore with water
  2. Wait 2-6 hours for polymer to degrade to high-viscosity gel in wellbore (heat + water cause degradation)
  3. Apply pressure at surface with small pump to “squeeze” high-viscosity gel (with suspended proppant) into formation (low velocity / high pressure)
  4. Within 1-2 days polymer gel completely degrades leaving proppant in place and no residue on formation

High-level graphic of procedure:

sf_process_3

Application of technology:

EnerPol is actively seeking oil / gas wells suitable for early commercialization of SqueezeFrac. Candidate wells will typically be vertical wells with a thin producing zone and a bottom-hole temperature greater than 140F. See below for more details on the ideal well characteristics and conditions for this stage of commercialization (much wider ranges of conditions will be available in the future).

Ideal well characteristics:

  • Mature, conventional (vertical) well
  • Bottom-hole temperature between 120-200F
  • Productive zone up to 20 ft in thickness
  • Permeability of at least ~0.1 millidarcy

Ideal well conditions:

  • Unfavorable well economics do not warrant cost of traditional hydraulic fracturing treatment
  • Well needs stimulation / workover
  • Oil / gas production likely hindered by near wellbore damage
  • Limited availability of water / horsepower or challenging surface conditions for infrastructure

Suitable formations (applicable for most formation types if permeability is greater than ~0.1 millidarcy):

  • Sandstone with proppant
  • Carbonate with / without proppant (acid fracture)

Example areas:

  • East Texas
  • South Texas
  • TX / LA Gulf Coast
  • Permian Basin (>7,000 ft depth)

Field Results:

  • We completed our first successful field test in January 2013 in Bee County, TX
  • Download the case study (PDF) by clicking here