A New Approach to the Sand Control Problem A Multi-Layer, Wire-Wrapped Sand Screen
Authors: Spurlock J.W. , Demski D.B. 
Published: December 2007

This paper was prepared for presentation at the 47th Annual Fall Meeting of the Society of Petroleum Engineers held in San Antonio, Tex., Oct. 8–11, 1972. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by who the paper is presented. Publication elsewhere after publication in the JOURNAL paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor of the appropriate journal provided agreement to give proper credit is made. provided agreement to give proper credit is made. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines.

Abstract
Single-layer, wire-wrapped sand screens have been used to control unconsolidated oil-bearing sands since the early 1900's. Although the first screens were somewhat primitive in design, the sane fundamental theories of their sand-restraining ability still apply today.. Gravel-packed screens and liners are considered very reliable but have limitations in that they are relatively expensive (primarily in rig time) to install and sometimes hinder subsequent workover operations on a well. This aspect of the gravel-packed screen has led to the development of a multi-layer, wire-wrapped sand screen which offers a new approach to the old problem of control of unconsolidated sand in both oil and gas wells.
The function of the multiple wraps of variously spaced wire is to bridge the larger sand grains at the outer layer of the screen, intermediate size grains in the successive layers, and the smaller size grains in the innermost layer. Thus, a selectively sorted gravel pack of formation sand is simulated in the screen. Gauge spacing of the wire is such that minute particles of silt and clay can migrate through the screen during installation and when production is initiated, thereby eliminating a major source of restriction experienced with conventional, single-wire-wrapped screens.
The multi-layer screen does not require a gravel pack but can be used with one if it is deemed advisable for added protection from highly abrasive particles in the well fluids produced at high velocities. It is applicable produced at high velocities. It is applicable for multiple completions and has been installed and tested in 33 wells onshore and 26 wells offshore with an overall success ratio of 80 percent. Completions with the screen have been percent. Completions with the screen have been made in high capacity gas wells and in oil wells produced by flowing, pumping and on gas-lift. produced by flowing, pumping and on gas-lift. The screen can be fabricated for any length interval and any size casing. It can be used for multiple completions without gravel packing and offers simplified mechanical packing and offers simplified mechanical possibilities for multi-zone completions. possibilities for multi-zone completions.