Analysis of physical-chemical factors complicating wells killing, using the example of a group of deposits of JSC "NIS" (Serbia)
UDC: 622.276
DOI: -
Authors:
ERMOLAEV A.I.
1,
STULOV L.G.2,
LOSEV A.P.1,
KILMAMATOV A.A.2,
POPIC D.2,
PANTIC JA.2
1 National University of Oil and Gas "Gubkin University", Moscow, Russia
2 NIS-Naftagas, Novy Sad, Serbia
Keywords: well killing, lithology, oil, formation water, killing fluid, sedimentation stability, compatibility
Annotation:
The authors of the article provide an example of a detailed analysis of field geophysical and laboratory data on rocks, oil, formation waters and well killing fluids, conducted to justify the well killing technology for a group of deposits. The rocks are described both by group mineral composition and by the content of ion-exchange clay minerals, taking into account the data of X-ray phase analysis. It is shown that the risks of clays swelling are high for some groups of deposits. The ionic composition of formation waters was analyzed using Piper and Sholler diagrams. It was concluded that all waters are sodium, and in the course of possible exchange reactions during the killing process they form soluble salts, and no problems with incompatibility are expected. Wellhead oil samples were comprehensively analyzed. The necessity of taking into account the presence of a surface-active colloidal phase in oil was emphasized, the risk of formation of which was confirmed by stability criterion calculation. The results of experiments to determine the thermal stability and corrosion action of killing fluids based on available commercial forms of sodium, potassium, and calcium chlorides are presented. According to the results of the study, it was revealed that solutions based on commercial calcium chloride form sediments in the entire range of concentrations.
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