An apparatus for continuously generating and controlling the density of foam has a fluid in-flow manifold in communication with a source of liquid and comprising a pressure sensor. A plurality of branch lines are in fluid communication with the in-flow manifold a foam out-flow manifold. Each branch line has a flow control valve, a Venturi tube and in fluid communication with a throat of each Venturi tube an air induction control valve. The foam out-flow manifold has a pressure sensor. At least one in-flow control valve is disposed between the source and the in-flow manifold and at least one out-flow control valve is in communication with the out-flow manifold. The branch valves, air valves, the in-flow control valve and the out-flow control valve are operable to provide a chosen flow rate of the liquid and a selected foam product flow rate at a selected density of the foam product.

A system and method is described that provides for proppant to be blended into a liquefied gas fluid stream with an eductor to produce a proppant slurry which is effectively controlled by the use of a control valve system and associated PLC controller. This system ensures allowing for operation of the system at various static pressures and keeps the proppant completely fluidized throughout the fracing operation.

An apparatus for continuously generating and controlling the density of foam has a fluid in-flow manifold in communication with a source of liquid and comprising a pressure sensor. A plurality of branch lines are in fluid communication with the in-flow manifold a foam out-flow manifold. Each branch line has a flow control valve, a Venturi tube and in fluid communication with a throat of each Venturi tube an air induction control valve. The foam out-flow manifold has a pressure sensor. At least one in-flow control valve is disposed between the source and the in-flow manifold and at least one out-flow control valve is in communication with the out-flow manifold. The branch valves, air valves, the in-flow control valve and the out-flow control valve are operable to provide a chosen flow rate of the liquid and a selected foam product flow rate at a selected density of the foam product.

An apparatus for continuously generating and controlling the density of foam has a fluid in-flow manifold in communication with a source of liquid and comprising a pressure sensor. A plurality of branch lines are in fluid communication with the in-flow manifold a foam out-flow manifold. Each branch line has a flow control valve, a Venturi tube and in fluid communication with a throat of each Venturi tube an air induction control valve. The foam out-flow manifold has a pressure sensor. At least one in-flow control valve is disposed between the source and the in-flow manifold and at least one out-flow control valve is in communication with the out-flow manifold. The branch valves, air valves, the in-flow control valve and the out-flow control valve are operable to provide a chosen flow rate of the liquid and a selected foam product flow rate at a selected density of the foam product.

A chemical injection system. The chemical injection system includes at least two Venturi injectors in parallel. Each of the Venturi injectors having an injector housing with a longitudinal cavity having the shape of hourglass. One end of the longitudinal cavity forms an injector inlet, and the other end forms an injector outlet. Each of the injector housings also has a first vertical cavity forming an injector port located at the hourglass constriction. The injector inlets are fluidly coupled together to form a shared injector input and each of the injector ports is fluidly coupled to an individual valve. Each of the injector outlets is fluidly coupled to the input a separate T-filter and the outputs of the T-filters are fluidly coupled together to form shared T-filter output.

An apparatus for continuously generating and controlling the density of foam has a fluid in-flow manifold in communication with a source of liquid and comprising a pressure sensor. A plurality of branch lines are in fluid communication with the in-flow manifold a foam out-flow manifold. Each branch line has a flow control valve, a Venturi tube and in fluid communication with a throat of each Venturi tube an air induction control valve. The foam out-flow manifold has a pressure sensor. At least one in-flow control valve is disposed between the source and the in-flow manifold and at least one out-flow control valve is in communication with the out-flow manifold. The branch valves, air valves, the in-flow control valve and the out-flow control valve are operable to provide a chosen flow rate of the liquid and a selected foam product flow rate at a selected density of the foam product.

A double venturi may include an outer venturi and an inner venturi at least partially surrounded by the outer venturi. The double venturi may include an inner venturi inlet, an inner venturi throat, a high pressure inlet port located in the inner venturi inlet and a low pressure inlet port located in the inner venturi throat. The inner venturi and the outer venturi may be coaxial.

A mixing manifold is provided. The manifold includes: a body; a first converging passageway in the body; a first diverging passageway in the body in-line and in fluid communication with the first converging passageway to form a first venturi; a first obstruction in a throat of the first venturi configured to move between two positions, a blocking position that blocks, at least in part, flow through the first venturi and an open position; a second converging passageway in the body; a second diverging passageway in the body in-line and in fluid communication with the second converging passageway to form a second venturi; and a second obstruction in the second venturi configured to move between two positions, a blocking position that blocks, at least in part, flow through the second venturi and an open position. A method of providing fluid flow through a manifold is also provided.

A device for mixing gasses has a tubular body with an axial passage channel for the introduction of a first gas and at least one radial supply channel for the introduction of a second gas. The device also includes a mixer. A corresponding apparatus and method for mixing gasses are also described.

A chemical injection system. The chemical injection system includes at least two Venturi injectors in parallel. Each of the Venturi injectors having an injector housing with a longitudinal cavity having the shape of hourglass. One end of the longitudinal cavity forms an injector inlet, and the other end forms an injector outlet. Each of the injector housings also has a first vertical cavity forming an injector port located at the hourglass constriction. The injector inlets are fluidly coupled together to form a shared injector input and each of the injector ports is fluidly coupled to an individual valve. Each of the injector outlets is fluidly coupled to the input a separate T-filter and the outputs of the T-filters are fluidly coupled together to form shared T-filter output.