Paper: Polymer Gelled Block A Diverting Agent For Acid Stimulations

This paper discusses the use of Polymer Gelled Block (PGB) as a diverting agent in staged acid stimulations performed in the San Andres Formation of the Slaughter Field in Hockley County, Texas. Improved results were obtained using this new material as compared to rock salt and benzoic acid flake blocks that were previously used. Several clear advantages of low residue PGB mixed "on the fly" over solid type blocking agents are discussed. Included are viscosities of the PGB during placement in the formation and then after the gel system has set up following the required 30 minute shut-in time. This demonstrates its capability of achieving a high extrusion pressure which tends to divert the subsequent treating fluid.