岔河集油田岔15、39断块黄原胶调剖先导试验

为解决低渗透断块油田开发后期层间，层内矛盾引起的油井水淹问题，华北油田公司二采油厂于1998－1999年在岔河集油田的岔15，39断块开展了黄原胶调驱结合的先导性试验，室内总结了两个调剂配方，在岔15，39两个新块上进行了先导性矿场试验，结果表明两种配方都具有较好的改善注水井吸水剖面与增油降水效果，可以提高注水的利用率和油藏的油水采收率。

Xanthane/Cr3+ Aqueous Gel and Its Use for Water Injectivit y Profile Adjustment in Fault-Blocks C15 and C39 of Chaheji Oil Fields

To impede severe water floodout in Chaheji fault-bl ock sandstone reservoirs of low permeability at middle-late periods of their de velopment, a xanthane/Cr3+ aqueous gel is formulated and used for adjustin g the injectivity profile of water injection wells in fault-block C15 and then in C39 as a whole. The xanthic gel is composed of thickener xanthane 2 500 mg/L, crosslinker chromium acetate 1 000 or 1 200 mg/L, and bactericide formalin 1 00 0 or 1 500 mg/L and is characterized by low retention in the strata after the bl ockages formed being broken through and thus by low damage for the reservoir for mations, as shown in laboratory core plugging/flooding experiments. The gel trea tments of far borehole zones(treating radii 9—21 m) are performed in 4 water in jection wells of C15 and in 9 wells of C39 with 480—960 m3 of gel injected i n to one well. The laboratory performance properties of the xanthic gel and the re sults of gel treatments are described.