Field Proven Sand Control for ESP & Rod Lift Pumps

The PumpGuard assembly is usually suspended from the pump or from a packer below. During initial production, the intake valve connected to the bottom of the screen is closed. Fluid flows (green arrows) radially into the MeshRite screen, which filters out sand and solids before the fluid flow enters the ESP or other downhole pump. Over time, the produced solids fill the annular space between the screen and the production casing, gradually restricting flow. As the particles consolidate, sand bridges can form and halt flow. Pressure builds up below the restriction. When the differential pressure across the PumpGuard assembly valve reaches the field-set value, the valve opens and enables unfiltered flow (red arrows) up the screen ID and directly through the pump intake.
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During planned and unplanned ESP shutdowns, sand and solids (e.g., scale) suspended in the tubing column fall and settle into the fluid stage of the pump and can lead to multiple failed restart attempts. Excessive torque during these restarts risks large motor current, a consequent increase in motor winding temperature, reduced ESP run life, and shaft breakage. A proprietary Sand Fallback Shield above the ESP guards against these eventualities.Under normal operation, the ESP lifts oil to surface unrestricted through the Sand Fallback Shield. During a shutdown, the shield restricts access, preventing sand and solids from falling into the pump. When the ESP restarts, the Sand Fallback Shield’s vertically and radially distributed flow area enables jetting and agitation of the solids settled on the exterior of the shield. Unrestricted production resumes up the cylindrical shield and out through it, along the tubing. The shield also permits injection from above at rates up to 4 bbl/min for well stimulation or cleanup.
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