Optimization of multi-pay wells functioning with ESP unit by the results of hydrodynamic and field-geophysical monitoring

Abstract

Relevance of the research is caused by the necessity to optimize the operation of multi-pay wells with electric-centrifugal pumps using layers individual parameters. The aim of the research is to analyze the information content and to improve the technique of complex production-geophysical studies of multi-pay wells equipped with «Y-Tool» bypasses; to develop, approve and implement the method for monitoring the individual parameters of the tapped marginal layers to obtain the reliable information on production profile along the wellbore; to recommend the activities to optimize production basing on monitoring results, sweep efficiency and production enhancement. Research methods: mathematical modeling of temperature and pressure fields in producing well, well testing and production logging, interpretation and complex analysis of all tests. Results. It was ascertained that it is possible to assess the productive layers rates by the results of thermometry at multi-pay well operation at pressure drawdown (applying the «Y-Tool» bypasses) with the collectors of low permeability. The most efficient thing in the considered conditions is the assessment of the rates outside the intervals of operating wells. Periodical surveys allow controlling the dynamic of layers depletion. The authors analyzed the temperature surveys at different times along with permanent pressure gauges data to dynamically monitor individual layers parameters (rates, pressures, skin etc). Analysis results are successfully used to optimize production.

Keywords

• oil
• development surveillance
• well thermal surveys
• well testing
• production log test (PLT)