D.L. KATZ METHOD IN OILFIELD PROBLEMS SOLUTION

Abstract

Background The separation of gas from oil occurs throughout the entire technological process of oil production and preparation due to the constant or periodic decrease in pressure in oilfield equipment. Only in borehole conditions, gas release from oil is observed twice: before and after the downhole pump. In surface conditions, an efficient multistage separation of gas from oil ensures economical and safe transportation of oil through the pipeline system, stabilization of oil and obtaining the maximal amount of marketable oil. The last two tasks are directly related to the permissible saturated vapor pressure of the oil and its component composition when delivering commercial oil to the consumer. The article discusses the solution of several tasks for the preparation of borehole products using the D.L. Katz method. Aims and Objectives o to determine the optimal position of PP-4V track heater in the technological chain of the water discharge and oil preparation unit; o to evaluate the possibility of using the D.L. Katz method for rapid assessment of saturated gas pressure of reservoir oil. Methods To calculate the component composition of the gas phase and the separated oil, the material balance method was used, which is expressed in the equality of moles of a certain component of the system before and after phase separation. Results According to D.L. Katz method there calculated 5 types for the degassing of reservoir oil from the Yarakta oil and gas condensate field. Among the considered three types for three-stage separation, the optimal position of the PP-4V track heater in the technological sequence of oil preparation was determined. Based on the analysis of the calculations, the possibilities of using the method of material balance and contact separation of gas from oil at various pressures in the PVT chamber to determine the pressure of saturation of oil with gas are substantiated.