Method for fracturing a formation using a fracturing fluid mixture
A technology for fracturing fluids and mixtures, applied in the direction of production fluids, drilling compositions, chemical instruments and methods, etc., which can solve the problems of increasing injection pressure of ground equipment and auxiliary equipment, weakening the effectiveness of viscosity-forming chemicals, and economic benefits of wells Expensive and other issues
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no. 1 approach
[0043] First Embodiment: Fracturing fluid in liquid phase during fracturing and in two phases during recovery mixture
[0044] According to the first embodiment of the formation fracturing method and with reference to Figure 4 to Figure 6 , certain properties of the frac fluid mixture are manipulated such that the mixture is in the liquid phase when it enters the frac formation and during the frac step of the operation, and during the recovery step of the operation (i.e., after injection ceases and during drawdown) in two phases.
[0045] In this embodiment, at typical fracturing pressures, natural gas is controlled to ensure complete dissolution in conventional hydrocarbon well servicing fluids, resulting in a high gas content single-phase liquid-like fluid mixture during injection. The natural gas content in the mixture may range from 5 mol% to 90 mol%. Conventional hydrocarbon well servicing fluids may or may not be viscosified and may or may not contain proppants. ...
no. 2 approach
[0059] Second Embodiment: Fracturing Fluid Mixture in Two Phases Throughout the Fracturing Operation
[0060] According to a second embodiment, certain properties and behavior of the fracturing fluid mixture are manipulated such that the mixture is in two phases throughout the fracturing operation. This embodiment is especially beneficial for fracturing shallow formations, formations with high capillary pressure causing fluid slugs, unsaturated formations that tend to trap fluids, and low permeability formations that require high pressure drops to move fluids within the reservoir .
[0061] In this embodiment, the relative amounts of natural gas and hydrocarbon well servicing fluid are controlled to ensure that the resulting mixture is supersaturated with conventional hydrocarbon well servicing fluid, thereby creating a two-phase fracture fluid mixture throughout the fracturing operation. The natural gas content in the mixture may range from 20% to 95% mole fraction. Conve...
no. 3 approach
[0065] Third Embodiment: Fracturing Fluid Mixture in Gas Phase Throughout Fracturing Operation
[0066] According to a third embodiment, certain properties and behavior of the fracturing fluid mixture are manipulated such that the mixture is in the gas phase throughout the fracturing process. This embodiment is useful for fracturing very shallow formations, formations with very low reservoir pressure, formations with high Formations of very low permeability to liquids are especially useful.
[0067] In this embodiment, the relative amount of conventional hydrocarbon well servicing fluid content in the mixture is minimized as much as possible; the natural gas content in the mixture may range from 80% to 99% mole fraction. Conventional hydrocarbon well servicing fluids may or may not be viscosified and may or may not contain proppants. The fracturing fluid mixture consists primarily of a gaseous phase, wherein gaseous natural gas contains relatively small amounts of conventi...
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