double layer prepack screen

Pre-Packed Screen Especially for Unconsolidated Formation

Pre-packed screen used as stand-alone screen

Pre-packed screen provide excellence service of sand control in oil, gas and water wells for its unique construction. Pre-packed screen is a modification of pipe-based wire wrapped screen. Its addition of a modular gravel pack makes it especially suitable for sand control where conventional gravel packing fails.

Features:

• Available in oil and gas well completions, especially in an open or cased hole with unconsolidated formations where stand-alone screen is needed.

• Pre-packed screen is easy to install for its unique construction.

• Stainless steel material gives it ability of resisting erosion.

• Pre-packed screen is equipped with packed layer itself. This unique configuration eliminates gravel placement and significantly shorten the time of drilling a well.

• Stronger construction like support rods reduces maintenance costs.

• Pre-packed screen is quite affordable in contrast to slotted liner.

Features self-cleaning and anti-plugging

Pre-packed screen vertical view and side view

Construction:

Pre-packed screen is comprised of six parts (from outer to inner) – outer screen, outer support rod, pre-packed gravel, inner screen, inner support rods and base pipe. This is a typical model of dual-screen prepack which features double wire wrapped screens.

The perforated base pipe is covered by inner wire wrapped jacket, whose diameter is smaller than the outer jacket. Between the two layers of jackets, an annular void is packed with silica sand with the appropriate size. The sand is coated by resin or ceramic beads. The gauge of the jacket wire is determined by the packed sand, while the size of the sand is determined by the formulation particle size distribution.

Materials:

Pre-packed screens can be fabricated in stainless steel 304, 316L, low carbon steel or other special alloys like Monel 400. Materials are available for specific alloy as required.

Custom size

A pre-packed screen should satisfy with specific application. Although some data are offered, there are still some should be given by our customers. For example, slot width, formation diameter, open area and other important data which will affect the effectiveness of the screen.

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