This paper presents the results of laboratory experiments carried out to investigate barium sulphate and strontium sulphate solid solution formation in multi-pressure tapoed cores. Two brines, one barium and strontium rich and the other sulphate rich, were mixed in a core plug. Pressure differentials were measured and the changing permeability distribution along the length of the core calculated. The morphology and chemical analysis of scaling crystals are presented based on Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDAX). The results show the large extent of permeability damage caused by (Ba,Sr)SO4 solid solution depositing on the rock pore surface. The rock permeability decline and morphology and size of the scaling crystals indicate the influence of the supersaturations of BaSO4 and SrSO4 as well as the concentration ratio of barium ions to strontium ions.
|Title of host publication||Proceedings: SPE Annual Technical Conference and Exhibition|
|Number of pages||20118008|
|Publication status||Published - 1988|
|Event||1988 SPE Annual Technical Conference and Exhibition - Houston, TX, United States|
Duration: 2 Oct 1988 → 5 Oct 1988
|Conference||1988 SPE Annual Technical Conference and Exhibition|
|Period||2/10/88 → 5/10/88|