Injector unit

An injection unit for the metering and injection of tracer materials into fluids used in a hydraulic well fracturing operation of an earthen formation pentrated by a well bore, said fluid being pumped into said well bore and earthen formation by a pump means located on the surface of the earth, said injection unit comprising:

• a base formed by side rails interconnected by crossmembers having an intermdiate member therebetween and a plurality of vertical members extending therefrom;
• an enclosed hopper for containing said tracer materials therein associated with the base being mounted thereon;
• a fluid reservoir for containing an amount of said fluid therein associated with the base being mounted thereon;
• an injection pump for pumping a mixture of said tracer materials from the hopper and said fluid from the fluid reservoir to said pump means, the injection pump being mounted on the base;
• a sight tube communicating with the enclosed hopper and the injection pump, the sight tube having an inlet and outlet;
• a metering valve connnected to the hopper to control the flow of said tracer materials from the hopper;
• a control valve to control the flow of the mixture of said tracer material from the hopper and said fluid from the fluid reservior from the injection pump, the control valve being connected to the outlet of the injection pump;
• an eductor having the inlet thereof communicating with the metering valve controlling the flow of said tracer materials from the hopper and the outlet thereof cimmunicating with the inlet of the sight tube;
• and
• a suction manifold connected of the outlet of the sight tube, the outlet of the fluid reservoir and the inlet of the injection pump.