Fracturing system and method for an underground formation using natural gas and an inert purging fluid
A natural gas and formation technology, applied in chemical instruments and methods, production fluids, climate sustainability, etc., can solve problems such as dangerous, unsafe devices and methods for natural gas
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no. 1 approach
[0047] First Embodiment: Fracturing Using a Base Fluid and Natural Gas from a Compressed Natural Gas Source Fracturing Systems for Fluid Mixtures
[0048] According to the first embodiment and referring to figure 2 , shows a system for fracturing a subterranean reservoir intersected by a well using a fracturing fluid mixture. Fracturing fluid mixtures are formed by agitating a natural gas stream, which comes from a compressed natural gas source, with a base fluid. The base fluid includes fracturing fluid and can also include viscosifying chemicals and proppants. More particularly, the fracturing fluid can be any one of oil, water, methanol, acid or a combination thereof as desired. The proppant can be natural frac sand or man-made particles. Chemical additives will be products generally suitable for creating viscosity in a liquid, reducing friction, or creating desired beneficial properties.
[0049] The main components of the system include fracturing fluid supply ta...
no. 2 approach
[0053] Second Embodiment: Fracturing Using a Base Fluid and Natural Gas from a Liquefied Natural Gas Source Fracturing Systems for Fluid Mixtures
[0054] refer to image 3 , Figures 10 to 1 4 And according to a second embodiment, there is provided a formation fracturing system using a fracturing fluid mixture comprising a base fluid and natural gas from a liquefied natural gas source. In particular, the fracturing system includes an LNG storage and vapor handling subsystem for storing LNG, pressurizing and heating the LNG to application temperatures, and then supplying natural gas to be mixed with the base fluid. In this embodiment, the LNG is heated to a temperature at which the natural gas is in the vapor phase; however, it is contemplated that in other embodiments the natural gas can be heated to a temperature at which the natural gas remains in the liquid phase. image 3 Shown is the LNG storage and vapor handling subsystem with the figure 1 fracturing system.
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no. 3 approach
[0070] Third Embodiment: Fracturing System for Injecting Fracturing Fluids Including Pure Natural Gas Streams
[0071] According to the third embodiment and referring to Figure 6 , providing a fracturing device using a fracturing fluid comprising a pure natural gas stream, where "pure" means containing no base fluid or proppant components. Fracturing with pure natural gas streams is beneficial in situations where no liquids are required during production and proppants are not required to maintain the formed fracture system. This is the usual case for fracturing coalbed methane wells or low pressure shale formations where fluid removal is difficult. In this embodiment, the natural gas source (415) is one or more containers containing either compressed natural gas or liquefied natural gas. A source of natural gas (415) is connected to a high pressure natural gas pump (417) through a conduit (423) with a valve (V44) for controlling the supply of natural gas. A high pressure...
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