ANALYSIS OF METHODS FOR JUSTIFYING AND MAKING DECISIONS AT REALIZING GEOLOGICAL AND ENGINEERING ACTIONS AIMED AT WATER INFLUX RESTRICTION

The article analyzes the basic geological and engineering factors of risk which must be taken into account before implementing the repair-isolation operations in oil and gas wells as well as graphical diagnostics of water cut development on the example of wells in the field Povhovskoye. The field-geophysical methods and actuality of hydrodynamic modeling are also discussed.

Validation of BeiDou Observations

This study presents validation of BeiDou measurements in un-differenced standalone mode and experimental results of its application for real data. A reparameterized form of the unknowns in a geometry-free observation model was used. Observations from each satellite are independently screened using a local modeling approach. Main advantages include that there is no need for computation of inter-system biases and no satellite navigation information are needed. Validation of the triple-frequency BeiDou data was performed in static and kinematic modes, the former at two continuously operating reference stations in Australia using data that span two consecutive days and the later in a walking mode for three hours. The use of the validation method parameters for numerical and graphical diagnostics of the multi-frequency BeiDou observations are discussed. The precision of the system’s observations was estimated using an empirical method that utilizes the characteristics of the validation statistics. The capability of the proposed method is demonstrated in detection and identification of artificial errors inserted in the static BeiDou data and when implemented in a single point positioning processing of the kinematic test.