Well stimulation

Since 1991, the partners of ”Consortium Group RS “ successfully implemented numerous projects to increase crude oil production in Russia, UAS, Ukraine and Uzbekistan.

The efficiency of oil extraction from the oil reservoir by modern industrial techniques mastered in all oil-producing countries today is considered to be unsatisfactory, even though consumption of petroleum products all around the world is growing up from year to year. Residual or nonrecoverable by industrial mastered techniques oil reserves reach at average 55-75% of oil initially in place.

Therefore the relevant tasks are the implementation of new technologies of oil production to increase oil recovery of already working seam, where extraction of significant residual oil reserves by traditional methods is impossible so far.

The interest to the oil recovery enhancing methods is grooving every year all around the world, and research aimed at finding a science-based approach to selecting the most effective development technologies is developing.

It is undisputed that having such a wide diversity of remaining reserves, as well as a large diversity of crude oil, water, gas properties and permeability of oil-saturated zones it is impossible to have unique generic method to increase oil recovery.

Together with its partners “Consortium Group RS” has extensive experience in application of methods of oil recovery increase and has more than 20 technologies to do this.

The customers in these projects are major oil and gas producing companies in Russia and abroad:

JSC “Rosneft”, JSC “Lukoil”, JSC “TNK-BP”, JSC “Tatneft”, JSC “Gazpromneft”, JSC “Surgutneftegaz”, JSC “All-Russia Institute for Oil and Gas Research”, JSC “Pertamina”, JSC “Vietsovpetro”.

Classification oil recovery increasing methods

By type of agents classification of known oil recovery increasing methods is as follows:

1. Thermal methods:

  • high temperature formation stimulation;
  • in situ burning;
  • hot water drive;
  • huff and puff treatment.

2. Gas methods:

  • air injection into formation;
  • formation simulation by hydrocarbon gas (including NGL);
  • formation stimulation by carbon dioxide;
  • formation impact by nitrogen, flue gases, etc.

3. Chemical methods:

  • oil displacement by surfactants water solutions (including foam systems);
  • oil displacement by polymer solutions;
  • oil displacement by alkali solutions;
  • oil displacement by acids;
  • oil displacement by chemical reagents compositions (including micellar solutions, etc.);
  • microbiological impact.

All the above methods have the potential ability to increase oil recovery.

In terms of impact on formation system in most cases namely the principle of combined impact is realized when hydrodynamic and thermal methods, hydrodynamic and physical and chemical methods, heat and physical and chemical methods, and so forth are combined.

4. Hydrodynamic methods:

  • integrated technologies;
  • involvement in the development of non-draining reserves;
  • barrier flooding in oil deposits;
  • moving (circular) flooding;
  • forced liquid selection;
  • graded thermal flooding.

5. Group of combined methods.

6. Physical methods of well production increase:

  • hydraulic fracture;
  • horizontal wells;
  • electromagnetic impact;
  • wave formation stimulation;
  • other similar methods.

Diagram of the different ways usefulness depending on the terrain characteristics:

As an aside it’s necessary to underline so-called natural methods of well production increase. It is not quite correct to combine them with the methods of oil recovery increase because the use of methods of oil recovery increase is characterized by increased potential of displacement agent and in physical methods the oil displacement agent potential agent is implemented through the use of formation natural energy. In addition, physical methods often do not improve the ultimate oil recovery, but only lead to temporary increases in production, that is raising the current oil recovery.

Potential of oil recovery increase by various methods:

According to pooled data at use of modern methods of oil recovery increase, oil recovery factor is 30-70% while using the primary ways to develop (using potential of formation energy) is on average no more than 20-25%, and using secondary methods (flooding and gas injection to maintain formation energy) is 25-35%, allowing to increase recoverable oil reserves by1.4 times.

...partners of "Consortium Group RS"