A method and hydraulic fracturing fluid that is a viscoelastic surfactant (VES) fracturing fluid having a surfactant and an inorganic oxidizer salt for hydraulic fracturing of a geological formation. The VES fracturing fluid is provided through a wellbore into the geological formation to hydraulically fracture the geological formation to form hydraulic fractures in the geological formation. The method includes oxidizing organic material in the hydraulic fractures with the VES fracturing fluid.

A method and hydraulic fracturing fluid that is a viscoelastic surfactant (VES) fracturing fluid having a surfactant and an inorganic oxidizer salt for hydraulic fracturing of a geological formation. The VES fracturing fluid is provided through a wellbore into the geological formation to hydraulically fracture the geological formation to form hydraulic fractures in the geological formation. The method includes oxidizing organic material in the hydraulic fractures with the VES fracturing fluid.

The present disclosure relates to a method for stimulating a subterranean formation that includes performing an initial stimulation in a wellbore positioned within the subterranean formation to place a designed volume of a first proppant in fractures, determining a near wellbore fracture width of the fractures, determining an unpropped fracture length of the fractures based on a rock bending model, determining an unpropped fracture volume based on the unpropped fracture length and near wellbore width of the fractures and performing a second stimulation treatment to place a proppant in fractures in an amount equal to the unpropped fracture volume. This operation allows to restore the conductivity of fracture in the damaged zone.

The present disclosure relates to a method for stimulating a subterranean formation that includes performing an initial stimulation in a wellbore positioned within the subterranean formation to place a designed volume of a first proppant in fractures, determining a near wellbore fracture width of the fractures, determining an unpropped fracture length of the fractures based on a rock bending model, determining an unpropped fracture volume based on the unpropped fracture length and near wellbore width of the fractures and performing a second stimulation treatment to place a proppant in fractures in an amount equal to the unpropped fracture volume. This operation allows to restore the conductivity of fracture in the damaged zone.

A system and method for independent control of simultaneous fracturing for multiple wellbores is disclosed. In certain embodiments, a first clean pumping unit and a first dirty pumping unit are fluidically coupled to a first wellbore, wherein the first clean pumping unit pumps a first fluid to the first wellbore and the second clean pumping unit pumps a second fluid to the first wellbore. In certain embodiments, a second clean pumping unit and a second dirty pumping unit are fluidically coupled to a second wellbore, wherein the second clean pumping unit pumps the first fluid to the second wellbore and the second dirty pumping unit pumps. In certain embodiments, a controller controls a pumping rate of at least one of the first clean pumping unit and the first dirty pumping unit based on a desired parameter of a combined fluid pumped to the first wellbore.

A system and method for independent control of simultaneous fracturing for multiple wellbores is disclosed. In certain embodiments, a first clean pumping unit and a first dirty pumping unit are fluidically coupled to a first wellbore, wherein the first clean pumping unit pumps a first fluid to the first wellbore and the second clean pumping unit pumps a second fluid to the first wellbore. In certain embodiments, a second clean pumping unit and a second dirty pumping unit are fluidically coupled to a second wellbore, wherein the second clean pumping unit pumps the first fluid to the second wellbore and the second dirty pumping unit pumps. In certain embodiments, a controller controls a pumping rate of at least one of the first clean pumping unit and the first dirty pumping unit based on a desired parameter of a combined fluid pumped to the first wellbore.

A method for coupling hydraulic fracture network extension and production performance of a horizontal well in an unconventional oil and gas reservoir includes: establishing a complex hydraulic fracture network model of a fractured horizontal well in an unconventional oil and gas reservoir based on a fracture extension theory; constructing three-dimensional three-phase mathematical models of seepage for the fractured horizontal well based on an embedded discrete fracture model; and constructing a fully implicit numerical calculation model by a finite difference method through three-dimensional orthogonal grids, and solving iteratively, thereby accurately predicting a production performance characteristic of the fractured horizontal well in the unconventional oil and gas reservoir. The method combines a fracture extension model with a production performance prediction model to realize the coupled simulation and prediction of the hydraulic fracture network extension and production performance of the horizontal well in the unconventional oil and gas reservoir.

A method for coupling hydraulic fracture network extension and production performance of a horizontal well in an unconventional oil and gas reservoir includes: establishing a complex hydraulic fracture network model of a fractured horizontal well in an unconventional oil and gas reservoir based on a fracture extension theory; constructing three-dimensional three-phase mathematical models of seepage for the fractured horizontal well based on an embedded discrete fracture model; and constructing a fully implicit numerical calculation model by a finite difference method through three-dimensional orthogonal grids, and solving iteratively, thereby accurately predicting a production performance characteristic of the fractured horizontal well in the unconventional oil and gas reservoir. The method combines a fracture extension model with a production performance prediction model to realize the coupled simulation and prediction of the hydraulic fracture network extension and production performance of the horizontal well in the unconventional oil and gas reservoir.

Disclosed are systems and methods for detecting the beginning of a flush volume. A blended fluid is output by a fluid blending apparatus and pumped into a wellbore. The blended fluid transitions from a first composition to a second composition. A blending signal comprising time-varying data relating to characteristics of the blending apparatus or measured from sensors associated with the blending apparatus is received. Based on a first portion of the blending signal corresponding to the first composition, a calibration profile is generated. Based on the calibration profile and a second portion of the blending signal corresponding to the second composition, a transition indicator corresponding to a change in the blended fluid from the first composition to the second composition is determined. Based on the transition indicator, a flush signal indicating the beginning of a flush volume being output by the blending apparatus and pumped into the wellbore is generated.

Disclosed are systems and methods for detecting the beginning of a flush volume. A blended fluid is output by a fluid blending apparatus and pumped into a wellbore. The blended fluid transitions from a first composition to a second composition. A blending signal comprising time-varying data relating to characteristics of the blending apparatus or measured from sensors associated with the blending apparatus is received. Based on a first portion of the blending signal corresponding to the first composition, a calibration profile is generated. Based on the calibration profile and a second portion of the blending signal corresponding to the second composition, a transition indicator corresponding to a change in the blended fluid from the first composition to the second composition is determined. Based on the transition indicator, a flush signal indicating the beginning of a flush volume being output by the blending apparatus and pumped into the wellbore is generated.