PDS

PDS

Technology using polymer-dispersed systems (PDS) with selective action and aimed at enhanced oil recovery of non-homogeneous terrigenous and carbonate reservoirs.

The cost of work is calculated individually

The technology has all the necessary licenses and permits

Technology Description

The mechanism of the PDS action is based on the formation of polymer-mineral complexes in the high permeable and flooded zones of the reservoir, which enables redistribution of filtration flows by area and section of the treated bed part and an increase in reservoir volumetric efficiency. The unique technology mechanism ensures its constant demand which increases when the fields reach the later stage of development.

Polymer-dispersion systems are the main enhanced oil recovery methods based on increasing filtration resistance of the flooded areas of the reservoir saturated with oil and water. To extend the technology's application, a number of modified PDSs have been developed, etc. In various geological and physical conditions of reservoirs, this allows the efficiency of the technological impact to increase by 25-50% in comparison with basic PDS technology.

Application

  • Oil fields with terrigenous and carbonate formations, whose reserves during water flooding are produced insufficiently and unevenly due to high layer and zonal heterogeneity of permeability.
  • The technology is implemented in reservoirs, allowing filtering of clay particles in the washed intervals.
  • Formations with natural and man-made cracks.

Presentation

with detailed
information

Efficiency

The technology has been implemented in the fields of the Volga-Urals, Western Siberia and Kazakhstan.

More than 6 mln additional tons of oil have been recovered. The specific technological effect is 3,000 tons per well operation.

Effect duration: more than 2.5 years.

Properties, Features and Answers to Questions  

Properties and Features

Features

  • The PDS insulating material is formed in the depths of the reservoir at a distance from the bottom of the well of up to 120-180 meters.
  • The selective nature of the PDS impact only increases filtration resistance in the water flooded, high permeable part of the formation, which is important for recovery of the remaining reserves.
  • The water insulating mass of the PDS formed in situ, has high structural and mechanical characteristics as well as stability that ensure that the process effect lasts more than 2.5 years.

Criteria of Applicability

  • Low coefficient of formation volumetric efficiency;
  • Number of permeable intervals exceeds 2;
  • Coefficient of initial oil saturation exceeds 0.60;
  • Watering of the recoverable product in total in the pilot area on deposits in terrigenous reservoirs is 70...99%, and in carbonate reservoirs it is 40...99%;
  • Minimum injectivity of the well is 150 m3/day at maximum pressure of 90% of the value during hydraulic tests of the production string.

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