PREDICTION OF THE DEPTH OF WAX DEPOSITION START IN OIL WELLS

Известия Томского политехнического университета: Инжиниринг георесурсов

Svetlana A. Nemtina¹  Vladimir V. Poplygin² 

[1] PITC Geofizika LLC;Perm National Research Polytechnic University;

关键词: well;    paraffin;    water cut;    temperature;    depth;    pressure;   

DOI  :  10.18799/24131830/2021/4/3146

来源: DOAJ

【 摘 要 】

Relevance. At present, oil production in a number of fields is complicated by the formation of asphaltene-resin-paraffin deposits on the surface of oil field equipment. The formation of deposits leads to decrease in tubing useful section and increased wear of pumping equipment, decrease in oil production. The aim of the research is to investigate the analytical models for determining the depth of the onset of asphaltene, tar and paraffin deposits in wells; assess the influence of production technological parameters (water cut, flow rate, pressure, etc.) on the depth of the beginning of formation of asphaltenes, resins and paraffins deposits. Object: Shershnevskoe field of the Perm region. Methods: laboratory research, field data analysis, computer modeling. Results. The authors have reviewув the composition and properties of formation fluids of the Shershnevskoe field. The generalization of the models is carried out to predict the depth of the beginning of the intensive formation of asphaltenes, resins and paraffins on the walls of downhole pumping equipment. It was revealed that in order to predict the formation of asphaltene-resin-paraffin deposits, as well as the selection of the most optimal technology to combat them, it is necessary to take into account, in addition to the flow temperature, the water cut of the product, the back pressure at the wellhead, and the flow rate. Determination of the depth of the beginning of intensive waxing of well products using the example of production wells of the Shershnevskoe oil field showed that there is a tendency to decrease the depth of the beginning of the formation of asphaltene-resin-paraffin deposits with increase in water cut and well flow rate by liquid. With increase in the water cut of well production, the depth of the onset of asphaltene-resin-paraffin deposits formation decreases on average by 20 m with growth in water cut by 10 %. With increase in the buffer pressure by 1 MPa, the depth of the beginning of formation of asphaltene-resin-paraffin deposits increases by 30 m. With increase in the frequency of the electric motor current by 2 Hz, the depth of the beginning of borehole waxing grows by 28 m.

【 授权许可】

Unknown